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, 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 /* Take it out of our own structures, but be sure to interlock with 115 * HW accelerating devices or SW vlan input packet processing if 116 * VLAN is not 0 (leave it there for 802.1p). 117 */ 118 if (vlan_id) 119 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id); 120 121 /* Get rid of the vlan's reference to real_dev */ 122 dev_put(real_dev); 123 } 124 125 int vlan_check_real_dev(struct net_device *real_dev, 126 __be16 protocol, u16 vlan_id) 127 { 128 const char *name = real_dev->name; 129 130 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) { 131 pr_info("VLANs not supported on %s\n", name); 132 return -EOPNOTSUPP; 133 } 134 135 if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) 136 return -EEXIST; 137 138 return 0; 139 } 140 141 int register_vlan_dev(struct net_device *dev) 142 { 143 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 144 struct net_device *real_dev = vlan->real_dev; 145 u16 vlan_id = vlan->vlan_id; 146 struct vlan_info *vlan_info; 147 struct vlan_group *grp; 148 int err; 149 150 err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id); 151 if (err) 152 return err; 153 154 vlan_info = rtnl_dereference(real_dev->vlan_info); 155 /* vlan_info should be there now. vlan_vid_add took care of it */ 156 BUG_ON(!vlan_info); 157 158 grp = &vlan_info->grp; 159 if (grp->nr_vlan_devs == 0) { 160 err = vlan_gvrp_init_applicant(real_dev); 161 if (err < 0) 162 goto out_vid_del; 163 err = vlan_mvrp_init_applicant(real_dev); 164 if (err < 0) 165 goto out_uninit_gvrp; 166 } 167 168 err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id); 169 if (err < 0) 170 goto out_uninit_mvrp; 171 172 vlan->nest_level = dev_get_nest_level(real_dev, is_vlan_dev) + 1; 173 err = register_netdevice(dev); 174 if (err < 0) 175 goto out_uninit_mvrp; 176 177 err = netdev_upper_dev_link(real_dev, dev); 178 if (err) 179 goto out_unregister_netdev; 180 181 /* Account for reference in struct vlan_dev_priv */ 182 dev_hold(real_dev); 183 184 netif_stacked_transfer_operstate(real_dev, dev); 185 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ 186 187 /* So, got the sucker initialized, now lets place 188 * it into our local structure. 189 */ 190 vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev); 191 grp->nr_vlan_devs++; 192 193 return 0; 194 195 out_unregister_netdev: 196 unregister_netdevice(dev); 197 out_uninit_mvrp: 198 if (grp->nr_vlan_devs == 0) 199 vlan_mvrp_uninit_applicant(real_dev); 200 out_uninit_gvrp: 201 if (grp->nr_vlan_devs == 0) 202 vlan_gvrp_uninit_applicant(real_dev); 203 out_vid_del: 204 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id); 205 return err; 206 } 207 208 /* Attach a VLAN device to a mac address (ie Ethernet Card). 209 * Returns 0 if the device was created or a negative error code otherwise. 210 */ 211 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id) 212 { 213 struct net_device *new_dev; 214 struct vlan_dev_priv *vlan; 215 struct net *net = dev_net(real_dev); 216 struct vlan_net *vn = net_generic(net, vlan_net_id); 217 char name[IFNAMSIZ]; 218 int err; 219 220 if (vlan_id >= VLAN_VID_MASK) 221 return -ERANGE; 222 223 err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id); 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 new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT); 265 266 vlan = vlan_dev_priv(new_dev); 267 vlan->vlan_proto = htons(ETH_P_8021Q); 268 vlan->vlan_id = vlan_id; 269 vlan->real_dev = real_dev; 270 vlan->dent = NULL; 271 vlan->flags = VLAN_FLAG_REORDER_HDR; 272 273 new_dev->rtnl_link_ops = &vlan_link_ops; 274 err = register_vlan_dev(new_dev); 275 if (err < 0) 276 goto out_free_newdev; 277 278 return 0; 279 280 out_free_newdev: 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 address was different from the old address and is equal to 295 * the new address */ 296 if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 297 ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 298 dev_uc_del(dev, vlandev->dev_addr); 299 300 /* vlan address was equal to the old address and is different from 301 * the new address */ 302 if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 303 !ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 304 dev_uc_add(dev, vlandev->dev_addr); 305 306 ether_addr_copy(vlan->real_dev_addr, dev->dev_addr); 307 } 308 309 static void vlan_transfer_features(struct net_device *dev, 310 struct net_device *vlandev) 311 { 312 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 313 314 vlandev->gso_max_size = dev->gso_max_size; 315 316 if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto)) 317 vlandev->hard_header_len = dev->hard_header_len; 318 else 319 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN; 320 321 #if IS_ENABLED(CONFIG_FCOE) 322 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 323 #endif 324 325 netdev_update_features(vlandev); 326 } 327 328 static int __vlan_device_event(struct net_device *dev, unsigned long event) 329 { 330 int err = 0; 331 332 switch (event) { 333 case NETDEV_CHANGENAME: 334 vlan_proc_rem_dev(dev); 335 err = vlan_proc_add_dev(dev); 336 break; 337 case NETDEV_REGISTER: 338 err = vlan_proc_add_dev(dev); 339 break; 340 case NETDEV_UNREGISTER: 341 vlan_proc_rem_dev(dev); 342 break; 343 } 344 345 return err; 346 } 347 348 static int vlan_device_event(struct notifier_block *unused, unsigned long event, 349 void *ptr) 350 { 351 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 352 struct vlan_group *grp; 353 struct vlan_info *vlan_info; 354 int i, flgs; 355 struct net_device *vlandev; 356 struct vlan_dev_priv *vlan; 357 bool last = false; 358 LIST_HEAD(list); 359 360 if (is_vlan_dev(dev)) { 361 int err = __vlan_device_event(dev, event); 362 363 if (err) 364 return notifier_from_errno(err); 365 } 366 367 if ((event == NETDEV_UP) && 368 (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) { 369 pr_info("adding VLAN 0 to HW filter on device %s\n", 370 dev->name); 371 vlan_vid_add(dev, htons(ETH_P_8021Q), 0); 372 } 373 374 vlan_info = rtnl_dereference(dev->vlan_info); 375 if (!vlan_info) 376 goto out; 377 grp = &vlan_info->grp; 378 379 /* It is OK that we do not hold the group lock right now, 380 * as we run under the RTNL lock. 381 */ 382 383 switch (event) { 384 case NETDEV_CHANGE: 385 /* Propagate real device state to vlan devices */ 386 vlan_group_for_each_dev(grp, i, vlandev) 387 netif_stacked_transfer_operstate(dev, vlandev); 388 break; 389 390 case NETDEV_CHANGEADDR: 391 /* Adjust unicast filters on underlying device */ 392 vlan_group_for_each_dev(grp, i, vlandev) { 393 flgs = vlandev->flags; 394 if (!(flgs & IFF_UP)) 395 continue; 396 397 vlan_sync_address(dev, vlandev); 398 } 399 break; 400 401 case NETDEV_CHANGEMTU: 402 vlan_group_for_each_dev(grp, i, vlandev) { 403 if (vlandev->mtu <= dev->mtu) 404 continue; 405 406 dev_set_mtu(vlandev, dev->mtu); 407 } 408 break; 409 410 case NETDEV_FEAT_CHANGE: 411 /* Propagate device features to underlying device */ 412 vlan_group_for_each_dev(grp, i, vlandev) 413 vlan_transfer_features(dev, vlandev); 414 break; 415 416 case NETDEV_DOWN: 417 if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) 418 vlan_vid_del(dev, htons(ETH_P_8021Q), 0); 419 420 /* Put all VLANs for this dev in the down state too. */ 421 vlan_group_for_each_dev(grp, i, vlandev) { 422 flgs = vlandev->flags; 423 if (!(flgs & IFF_UP)) 424 continue; 425 426 vlan = vlan_dev_priv(vlandev); 427 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 428 dev_change_flags(vlandev, flgs & ~IFF_UP); 429 netif_stacked_transfer_operstate(dev, vlandev); 430 } 431 break; 432 433 case NETDEV_UP: 434 /* Put all VLANs for this dev in the up state too. */ 435 vlan_group_for_each_dev(grp, i, vlandev) { 436 flgs = vlandev->flags; 437 if (flgs & IFF_UP) 438 continue; 439 440 vlan = vlan_dev_priv(vlandev); 441 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 442 dev_change_flags(vlandev, flgs | IFF_UP); 443 netif_stacked_transfer_operstate(dev, vlandev); 444 } 445 break; 446 447 case NETDEV_UNREGISTER: 448 /* twiddle thumbs on netns device moves */ 449 if (dev->reg_state != NETREG_UNREGISTERING) 450 break; 451 452 vlan_group_for_each_dev(grp, i, vlandev) { 453 /* removal of last vid destroys vlan_info, abort 454 * afterwards */ 455 if (vlan_info->nr_vids == 1) 456 last = true; 457 458 unregister_vlan_dev(vlandev, &list); 459 if (last) 460 break; 461 } 462 unregister_netdevice_many(&list); 463 break; 464 465 case NETDEV_PRE_TYPE_CHANGE: 466 /* Forbid underlaying device to change its type. */ 467 if (vlan_uses_dev(dev)) 468 return NOTIFY_BAD; 469 break; 470 471 case NETDEV_NOTIFY_PEERS: 472 case NETDEV_BONDING_FAILOVER: 473 case NETDEV_RESEND_IGMP: 474 /* Propagate to vlan devices */ 475 vlan_group_for_each_dev(grp, i, vlandev) 476 call_netdevice_notifiers(event, vlandev); 477 break; 478 } 479 480 out: 481 return NOTIFY_DONE; 482 } 483 484 static struct notifier_block vlan_notifier_block __read_mostly = { 485 .notifier_call = vlan_device_event, 486 }; 487 488 /* 489 * VLAN IOCTL handler. 490 * o execute requested action or pass command to the device driver 491 * arg is really a struct vlan_ioctl_args __user *. 492 */ 493 static int vlan_ioctl_handler(struct net *net, void __user *arg) 494 { 495 int err; 496 struct vlan_ioctl_args args; 497 struct net_device *dev = NULL; 498 499 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 500 return -EFAULT; 501 502 /* Null terminate this sucker, just in case. */ 503 args.device1[23] = 0; 504 args.u.device2[23] = 0; 505 506 rtnl_lock(); 507 508 switch (args.cmd) { 509 case SET_VLAN_INGRESS_PRIORITY_CMD: 510 case SET_VLAN_EGRESS_PRIORITY_CMD: 511 case SET_VLAN_FLAG_CMD: 512 case ADD_VLAN_CMD: 513 case DEL_VLAN_CMD: 514 case GET_VLAN_REALDEV_NAME_CMD: 515 case GET_VLAN_VID_CMD: 516 err = -ENODEV; 517 dev = __dev_get_by_name(net, args.device1); 518 if (!dev) 519 goto out; 520 521 err = -EINVAL; 522 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 523 goto out; 524 } 525 526 switch (args.cmd) { 527 case SET_VLAN_INGRESS_PRIORITY_CMD: 528 err = -EPERM; 529 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 530 break; 531 vlan_dev_set_ingress_priority(dev, 532 args.u.skb_priority, 533 args.vlan_qos); 534 err = 0; 535 break; 536 537 case SET_VLAN_EGRESS_PRIORITY_CMD: 538 err = -EPERM; 539 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 540 break; 541 err = vlan_dev_set_egress_priority(dev, 542 args.u.skb_priority, 543 args.vlan_qos); 544 break; 545 546 case SET_VLAN_FLAG_CMD: 547 err = -EPERM; 548 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 549 break; 550 err = vlan_dev_change_flags(dev, 551 args.vlan_qos ? args.u.flag : 0, 552 args.u.flag); 553 break; 554 555 case SET_VLAN_NAME_TYPE_CMD: 556 err = -EPERM; 557 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 558 break; 559 if ((args.u.name_type >= 0) && 560 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 561 struct vlan_net *vn; 562 563 vn = net_generic(net, vlan_net_id); 564 vn->name_type = args.u.name_type; 565 err = 0; 566 } else { 567 err = -EINVAL; 568 } 569 break; 570 571 case ADD_VLAN_CMD: 572 err = -EPERM; 573 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 574 break; 575 err = register_vlan_device(dev, args.u.VID); 576 break; 577 578 case DEL_VLAN_CMD: 579 err = -EPERM; 580 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 581 break; 582 unregister_vlan_dev(dev, NULL); 583 err = 0; 584 break; 585 586 case GET_VLAN_REALDEV_NAME_CMD: 587 err = 0; 588 vlan_dev_get_realdev_name(dev, args.u.device2); 589 if (copy_to_user(arg, &args, 590 sizeof(struct vlan_ioctl_args))) 591 err = -EFAULT; 592 break; 593 594 case GET_VLAN_VID_CMD: 595 err = 0; 596 args.u.VID = vlan_dev_vlan_id(dev); 597 if (copy_to_user(arg, &args, 598 sizeof(struct vlan_ioctl_args))) 599 err = -EFAULT; 600 break; 601 602 default: 603 err = -EOPNOTSUPP; 604 break; 605 } 606 out: 607 rtnl_unlock(); 608 return err; 609 } 610 611 static int __net_init vlan_init_net(struct net *net) 612 { 613 struct vlan_net *vn = net_generic(net, vlan_net_id); 614 int err; 615 616 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 617 618 err = vlan_proc_init(net); 619 620 return err; 621 } 622 623 static void __net_exit vlan_exit_net(struct net *net) 624 { 625 vlan_proc_cleanup(net); 626 } 627 628 static struct pernet_operations vlan_net_ops = { 629 .init = vlan_init_net, 630 .exit = vlan_exit_net, 631 .id = &vlan_net_id, 632 .size = sizeof(struct vlan_net), 633 }; 634 635 static int __init vlan_proto_init(void) 636 { 637 int err; 638 639 pr_info("%s v%s\n", vlan_fullname, vlan_version); 640 641 err = register_pernet_subsys(&vlan_net_ops); 642 if (err < 0) 643 goto err0; 644 645 err = register_netdevice_notifier(&vlan_notifier_block); 646 if (err < 0) 647 goto err2; 648 649 err = vlan_gvrp_init(); 650 if (err < 0) 651 goto err3; 652 653 err = vlan_mvrp_init(); 654 if (err < 0) 655 goto err4; 656 657 err = vlan_netlink_init(); 658 if (err < 0) 659 goto err5; 660 661 vlan_ioctl_set(vlan_ioctl_handler); 662 return 0; 663 664 err5: 665 vlan_mvrp_uninit(); 666 err4: 667 vlan_gvrp_uninit(); 668 err3: 669 unregister_netdevice_notifier(&vlan_notifier_block); 670 err2: 671 unregister_pernet_subsys(&vlan_net_ops); 672 err0: 673 return err; 674 } 675 676 static void __exit vlan_cleanup_module(void) 677 { 678 vlan_ioctl_set(NULL); 679 vlan_netlink_fini(); 680 681 unregister_netdevice_notifier(&vlan_notifier_block); 682 683 unregister_pernet_subsys(&vlan_net_ops); 684 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 685 686 vlan_mvrp_uninit(); 687 vlan_gvrp_uninit(); 688 } 689 690 module_init(vlan_proto_init); 691 module_exit(vlan_cleanup_module); 692 693 MODULE_LICENSE("GPL"); 694 MODULE_VERSION(DRV_VERSION); 695