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, vlan_setup); 254 255 if (new_dev == NULL) 256 return -ENOBUFS; 257 258 dev_net_set(new_dev, net); 259 /* need 4 bytes for extra VLAN header info, 260 * hope the underlying device can handle it. 261 */ 262 new_dev->mtu = real_dev->mtu; 263 new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT); 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); 274 if (err < 0) 275 goto out_free_newdev; 276 277 return 0; 278 279 out_free_newdev: 280 free_netdev(new_dev); 281 return err; 282 } 283 284 static void vlan_sync_address(struct net_device *dev, 285 struct net_device *vlandev) 286 { 287 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 288 289 /* May be called without an actual change */ 290 if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr)) 291 return; 292 293 /* vlan address was different from the old address and is equal to 294 * the new address */ 295 if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 296 ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 297 dev_uc_del(dev, vlandev->dev_addr); 298 299 /* vlan address was equal to the old address and is different from 300 * the new address */ 301 if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 302 !ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 303 dev_uc_add(dev, vlandev->dev_addr); 304 305 ether_addr_copy(vlan->real_dev_addr, dev->dev_addr); 306 } 307 308 static void vlan_transfer_features(struct net_device *dev, 309 struct net_device *vlandev) 310 { 311 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 312 313 vlandev->gso_max_size = dev->gso_max_size; 314 315 if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto)) 316 vlandev->hard_header_len = dev->hard_header_len; 317 else 318 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN; 319 320 #if IS_ENABLED(CONFIG_FCOE) 321 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 322 #endif 323 324 netdev_update_features(vlandev); 325 } 326 327 static void __vlan_device_event(struct net_device *dev, unsigned long event) 328 { 329 switch (event) { 330 case NETDEV_CHANGENAME: 331 vlan_proc_rem_dev(dev); 332 if (vlan_proc_add_dev(dev) < 0) 333 pr_warn("failed to change proc name for %s\n", 334 dev->name); 335 break; 336 case NETDEV_REGISTER: 337 if (vlan_proc_add_dev(dev) < 0) 338 pr_warn("failed to add proc entry for %s\n", dev->name); 339 break; 340 case NETDEV_UNREGISTER: 341 vlan_proc_rem_dev(dev); 342 break; 343 } 344 } 345 346 static int vlan_device_event(struct notifier_block *unused, unsigned long event, 347 void *ptr) 348 { 349 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 350 struct vlan_group *grp; 351 struct vlan_info *vlan_info; 352 int i, flgs; 353 struct net_device *vlandev; 354 struct vlan_dev_priv *vlan; 355 bool last = false; 356 LIST_HEAD(list); 357 358 if (is_vlan_dev(dev)) 359 __vlan_device_event(dev, event); 360 361 if ((event == NETDEV_UP) && 362 (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) { 363 pr_info("adding VLAN 0 to HW filter on device %s\n", 364 dev->name); 365 vlan_vid_add(dev, htons(ETH_P_8021Q), 0); 366 } 367 368 vlan_info = rtnl_dereference(dev->vlan_info); 369 if (!vlan_info) 370 goto out; 371 grp = &vlan_info->grp; 372 373 /* It is OK that we do not hold the group lock right now, 374 * as we run under the RTNL lock. 375 */ 376 377 switch (event) { 378 case NETDEV_CHANGE: 379 /* Propagate real device state to vlan devices */ 380 vlan_group_for_each_dev(grp, i, vlandev) 381 netif_stacked_transfer_operstate(dev, vlandev); 382 break; 383 384 case NETDEV_CHANGEADDR: 385 /* Adjust unicast filters on underlying device */ 386 vlan_group_for_each_dev(grp, i, vlandev) { 387 flgs = vlandev->flags; 388 if (!(flgs & IFF_UP)) 389 continue; 390 391 vlan_sync_address(dev, vlandev); 392 } 393 break; 394 395 case NETDEV_CHANGEMTU: 396 vlan_group_for_each_dev(grp, i, vlandev) { 397 if (vlandev->mtu <= dev->mtu) 398 continue; 399 400 dev_set_mtu(vlandev, dev->mtu); 401 } 402 break; 403 404 case NETDEV_FEAT_CHANGE: 405 /* Propagate device features to underlying device */ 406 vlan_group_for_each_dev(grp, i, vlandev) 407 vlan_transfer_features(dev, vlandev); 408 break; 409 410 case NETDEV_DOWN: 411 if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) 412 vlan_vid_del(dev, htons(ETH_P_8021Q), 0); 413 414 /* Put all VLANs for this dev in the down state too. */ 415 vlan_group_for_each_dev(grp, i, vlandev) { 416 flgs = vlandev->flags; 417 if (!(flgs & IFF_UP)) 418 continue; 419 420 vlan = vlan_dev_priv(vlandev); 421 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 422 dev_change_flags(vlandev, flgs & ~IFF_UP); 423 netif_stacked_transfer_operstate(dev, vlandev); 424 } 425 break; 426 427 case NETDEV_UP: 428 /* Put all VLANs for this dev in the up state too. */ 429 vlan_group_for_each_dev(grp, i, vlandev) { 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 vlan_group_for_each_dev(grp, i, vlandev) { 447 /* removal of last vid destroys vlan_info, abort 448 * afterwards */ 449 if (vlan_info->nr_vids == 1) 450 last = true; 451 452 unregister_vlan_dev(vlandev, &list); 453 if (last) 454 break; 455 } 456 unregister_netdevice_many(&list); 457 break; 458 459 case NETDEV_PRE_TYPE_CHANGE: 460 /* Forbid underlaying device to change its type. */ 461 if (vlan_uses_dev(dev)) 462 return NOTIFY_BAD; 463 break; 464 465 case NETDEV_NOTIFY_PEERS: 466 case NETDEV_BONDING_FAILOVER: 467 case NETDEV_RESEND_IGMP: 468 /* Propagate to vlan devices */ 469 vlan_group_for_each_dev(grp, i, vlandev) 470 call_netdevice_notifiers(event, vlandev); 471 break; 472 } 473 474 out: 475 return NOTIFY_DONE; 476 } 477 478 static struct notifier_block vlan_notifier_block __read_mostly = { 479 .notifier_call = vlan_device_event, 480 }; 481 482 /* 483 * VLAN IOCTL handler. 484 * o execute requested action or pass command to the device driver 485 * arg is really a struct vlan_ioctl_args __user *. 486 */ 487 static int vlan_ioctl_handler(struct net *net, void __user *arg) 488 { 489 int err; 490 struct vlan_ioctl_args args; 491 struct net_device *dev = NULL; 492 493 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 494 return -EFAULT; 495 496 /* Null terminate this sucker, just in case. */ 497 args.device1[23] = 0; 498 args.u.device2[23] = 0; 499 500 rtnl_lock(); 501 502 switch (args.cmd) { 503 case SET_VLAN_INGRESS_PRIORITY_CMD: 504 case SET_VLAN_EGRESS_PRIORITY_CMD: 505 case SET_VLAN_FLAG_CMD: 506 case ADD_VLAN_CMD: 507 case DEL_VLAN_CMD: 508 case GET_VLAN_REALDEV_NAME_CMD: 509 case GET_VLAN_VID_CMD: 510 err = -ENODEV; 511 dev = __dev_get_by_name(net, args.device1); 512 if (!dev) 513 goto out; 514 515 err = -EINVAL; 516 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 517 goto out; 518 } 519 520 switch (args.cmd) { 521 case SET_VLAN_INGRESS_PRIORITY_CMD: 522 err = -EPERM; 523 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 524 break; 525 vlan_dev_set_ingress_priority(dev, 526 args.u.skb_priority, 527 args.vlan_qos); 528 err = 0; 529 break; 530 531 case SET_VLAN_EGRESS_PRIORITY_CMD: 532 err = -EPERM; 533 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 534 break; 535 err = vlan_dev_set_egress_priority(dev, 536 args.u.skb_priority, 537 args.vlan_qos); 538 break; 539 540 case SET_VLAN_FLAG_CMD: 541 err = -EPERM; 542 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 543 break; 544 err = vlan_dev_change_flags(dev, 545 args.vlan_qos ? args.u.flag : 0, 546 args.u.flag); 547 break; 548 549 case SET_VLAN_NAME_TYPE_CMD: 550 err = -EPERM; 551 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 552 break; 553 if ((args.u.name_type >= 0) && 554 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 555 struct vlan_net *vn; 556 557 vn = net_generic(net, vlan_net_id); 558 vn->name_type = args.u.name_type; 559 err = 0; 560 } else { 561 err = -EINVAL; 562 } 563 break; 564 565 case ADD_VLAN_CMD: 566 err = -EPERM; 567 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 568 break; 569 err = register_vlan_device(dev, args.u.VID); 570 break; 571 572 case DEL_VLAN_CMD: 573 err = -EPERM; 574 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 575 break; 576 unregister_vlan_dev(dev, NULL); 577 err = 0; 578 break; 579 580 case GET_VLAN_REALDEV_NAME_CMD: 581 err = 0; 582 vlan_dev_get_realdev_name(dev, args.u.device2); 583 if (copy_to_user(arg, &args, 584 sizeof(struct vlan_ioctl_args))) 585 err = -EFAULT; 586 break; 587 588 case GET_VLAN_VID_CMD: 589 err = 0; 590 args.u.VID = vlan_dev_vlan_id(dev); 591 if (copy_to_user(arg, &args, 592 sizeof(struct vlan_ioctl_args))) 593 err = -EFAULT; 594 break; 595 596 default: 597 err = -EOPNOTSUPP; 598 break; 599 } 600 out: 601 rtnl_unlock(); 602 return err; 603 } 604 605 static int __net_init vlan_init_net(struct net *net) 606 { 607 struct vlan_net *vn = net_generic(net, vlan_net_id); 608 int err; 609 610 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 611 612 err = vlan_proc_init(net); 613 614 return err; 615 } 616 617 static void __net_exit vlan_exit_net(struct net *net) 618 { 619 vlan_proc_cleanup(net); 620 } 621 622 static struct pernet_operations vlan_net_ops = { 623 .init = vlan_init_net, 624 .exit = vlan_exit_net, 625 .id = &vlan_net_id, 626 .size = sizeof(struct vlan_net), 627 }; 628 629 static int __init vlan_proto_init(void) 630 { 631 int err; 632 633 pr_info("%s v%s\n", vlan_fullname, vlan_version); 634 635 err = register_pernet_subsys(&vlan_net_ops); 636 if (err < 0) 637 goto err0; 638 639 err = register_netdevice_notifier(&vlan_notifier_block); 640 if (err < 0) 641 goto err2; 642 643 err = vlan_gvrp_init(); 644 if (err < 0) 645 goto err3; 646 647 err = vlan_mvrp_init(); 648 if (err < 0) 649 goto err4; 650 651 err = vlan_netlink_init(); 652 if (err < 0) 653 goto err5; 654 655 vlan_ioctl_set(vlan_ioctl_handler); 656 return 0; 657 658 err5: 659 vlan_mvrp_uninit(); 660 err4: 661 vlan_gvrp_uninit(); 662 err3: 663 unregister_netdevice_notifier(&vlan_notifier_block); 664 err2: 665 unregister_pernet_subsys(&vlan_net_ops); 666 err0: 667 return err; 668 } 669 670 static void __exit vlan_cleanup_module(void) 671 { 672 vlan_ioctl_set(NULL); 673 vlan_netlink_fini(); 674 675 unregister_netdevice_notifier(&vlan_notifier_block); 676 677 unregister_pernet_subsys(&vlan_net_ops); 678 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 679 680 vlan_mvrp_uninit(); 681 vlan_gvrp_uninit(); 682 } 683 684 module_init(vlan_proto_init); 685 module_exit(vlan_cleanup_module); 686 687 MODULE_LICENSE("GPL"); 688 MODULE_VERSION(DRV_VERSION); 689