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 err = register_netdevice(dev); 173 if (err < 0) 174 goto out_uninit_mvrp; 175 176 err = netdev_upper_dev_link(real_dev, dev); 177 if (err) 178 goto out_unregister_netdev; 179 180 /* Account for reference in struct vlan_dev_priv */ 181 dev_hold(real_dev); 182 183 netif_stacked_transfer_operstate(real_dev, dev); 184 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ 185 186 /* So, got the sucker initialized, now lets place 187 * it into our local structure. 188 */ 189 vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev); 190 grp->nr_vlan_devs++; 191 192 return 0; 193 194 out_unregister_netdev: 195 unregister_netdevice(dev); 196 out_uninit_mvrp: 197 if (grp->nr_vlan_devs == 0) 198 vlan_mvrp_uninit_applicant(real_dev); 199 out_uninit_gvrp: 200 if (grp->nr_vlan_devs == 0) 201 vlan_gvrp_uninit_applicant(real_dev); 202 out_vid_del: 203 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id); 204 return err; 205 } 206 207 /* Attach a VLAN device to a mac address (ie Ethernet Card). 208 * Returns 0 if the device was created or a negative error code otherwise. 209 */ 210 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id) 211 { 212 struct net_device *new_dev; 213 struct vlan_dev_priv *vlan; 214 struct net *net = dev_net(real_dev); 215 struct vlan_net *vn = net_generic(net, vlan_net_id); 216 char name[IFNAMSIZ]; 217 int err; 218 219 if (vlan_id >= VLAN_VID_MASK) 220 return -ERANGE; 221 222 err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id); 223 if (err < 0) 224 return err; 225 226 /* Gotta set up the fields for the device. */ 227 switch (vn->name_type) { 228 case VLAN_NAME_TYPE_RAW_PLUS_VID: 229 /* name will look like: eth1.0005 */ 230 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id); 231 break; 232 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: 233 /* Put our vlan.VID in the name. 234 * Name will look like: vlan5 235 */ 236 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id); 237 break; 238 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: 239 /* Put our vlan.VID in the name. 240 * Name will look like: eth0.5 241 */ 242 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id); 243 break; 244 case VLAN_NAME_TYPE_PLUS_VID: 245 /* Put our vlan.VID in the name. 246 * Name will look like: vlan0005 247 */ 248 default: 249 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id); 250 } 251 252 new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup); 253 254 if (new_dev == NULL) 255 return -ENOBUFS; 256 257 dev_net_set(new_dev, net); 258 /* need 4 bytes for extra VLAN header info, 259 * hope the underlying device can handle it. 260 */ 261 new_dev->mtu = real_dev->mtu; 262 new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT); 263 264 vlan = vlan_dev_priv(new_dev); 265 vlan->vlan_proto = htons(ETH_P_8021Q); 266 vlan->vlan_id = vlan_id; 267 vlan->real_dev = real_dev; 268 vlan->dent = NULL; 269 vlan->flags = VLAN_FLAG_REORDER_HDR; 270 271 new_dev->rtnl_link_ops = &vlan_link_ops; 272 err = register_vlan_dev(new_dev); 273 if (err < 0) 274 goto out_free_newdev; 275 276 return 0; 277 278 out_free_newdev: 279 free_netdev(new_dev); 280 return err; 281 } 282 283 static void vlan_sync_address(struct net_device *dev, 284 struct net_device *vlandev) 285 { 286 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 287 288 /* May be called without an actual change */ 289 if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr)) 290 return; 291 292 /* vlan address was different from the old address and is equal to 293 * the new address */ 294 if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 295 ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 296 dev_uc_del(dev, vlandev->dev_addr); 297 298 /* vlan address was equal to the old address and is different from 299 * the new address */ 300 if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 301 !ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 302 dev_uc_add(dev, vlandev->dev_addr); 303 304 ether_addr_copy(vlan->real_dev_addr, dev->dev_addr); 305 } 306 307 static void vlan_transfer_features(struct net_device *dev, 308 struct net_device *vlandev) 309 { 310 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 311 312 vlandev->gso_max_size = dev->gso_max_size; 313 314 if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto)) 315 vlandev->hard_header_len = dev->hard_header_len; 316 else 317 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN; 318 319 #if IS_ENABLED(CONFIG_FCOE) 320 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 321 #endif 322 323 netdev_update_features(vlandev); 324 } 325 326 static void __vlan_device_event(struct net_device *dev, unsigned long event) 327 { 328 switch (event) { 329 case NETDEV_CHANGENAME: 330 vlan_proc_rem_dev(dev); 331 if (vlan_proc_add_dev(dev) < 0) 332 pr_warn("failed to change proc name for %s\n", 333 dev->name); 334 break; 335 case NETDEV_REGISTER: 336 if (vlan_proc_add_dev(dev) < 0) 337 pr_warn("failed to add proc entry for %s\n", dev->name); 338 break; 339 case NETDEV_UNREGISTER: 340 vlan_proc_rem_dev(dev); 341 break; 342 } 343 } 344 345 static int vlan_device_event(struct notifier_block *unused, unsigned long event, 346 void *ptr) 347 { 348 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 349 struct vlan_group *grp; 350 struct vlan_info *vlan_info; 351 int i, flgs; 352 struct net_device *vlandev; 353 struct vlan_dev_priv *vlan; 354 bool last = false; 355 LIST_HEAD(list); 356 357 if (is_vlan_dev(dev)) 358 __vlan_device_event(dev, event); 359 360 if ((event == NETDEV_UP) && 361 (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) { 362 pr_info("adding VLAN 0 to HW filter on device %s\n", 363 dev->name); 364 vlan_vid_add(dev, htons(ETH_P_8021Q), 0); 365 } 366 367 vlan_info = rtnl_dereference(dev->vlan_info); 368 if (!vlan_info) 369 goto out; 370 grp = &vlan_info->grp; 371 372 /* It is OK that we do not hold the group lock right now, 373 * as we run under the RTNL lock. 374 */ 375 376 switch (event) { 377 case NETDEV_CHANGE: 378 /* Propagate real device state to vlan devices */ 379 vlan_group_for_each_dev(grp, i, vlandev) 380 netif_stacked_transfer_operstate(dev, vlandev); 381 break; 382 383 case NETDEV_CHANGEADDR: 384 /* Adjust unicast filters on underlying device */ 385 vlan_group_for_each_dev(grp, i, vlandev) { 386 flgs = vlandev->flags; 387 if (!(flgs & IFF_UP)) 388 continue; 389 390 vlan_sync_address(dev, vlandev); 391 } 392 break; 393 394 case NETDEV_CHANGEMTU: 395 vlan_group_for_each_dev(grp, i, vlandev) { 396 if (vlandev->mtu <= dev->mtu) 397 continue; 398 399 dev_set_mtu(vlandev, dev->mtu); 400 } 401 break; 402 403 case NETDEV_FEAT_CHANGE: 404 /* Propagate device features to underlying device */ 405 vlan_group_for_each_dev(grp, i, vlandev) 406 vlan_transfer_features(dev, vlandev); 407 break; 408 409 case NETDEV_DOWN: 410 if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) 411 vlan_vid_del(dev, htons(ETH_P_8021Q), 0); 412 413 /* Put all VLANs for this dev in the down state too. */ 414 vlan_group_for_each_dev(grp, i, vlandev) { 415 flgs = vlandev->flags; 416 if (!(flgs & IFF_UP)) 417 continue; 418 419 vlan = vlan_dev_priv(vlandev); 420 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 421 dev_change_flags(vlandev, flgs & ~IFF_UP); 422 netif_stacked_transfer_operstate(dev, vlandev); 423 } 424 break; 425 426 case NETDEV_UP: 427 /* Put all VLANs for this dev in the up state too. */ 428 vlan_group_for_each_dev(grp, i, vlandev) { 429 flgs = vlandev->flags; 430 if (flgs & IFF_UP) 431 continue; 432 433 vlan = vlan_dev_priv(vlandev); 434 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 435 dev_change_flags(vlandev, flgs | IFF_UP); 436 netif_stacked_transfer_operstate(dev, vlandev); 437 } 438 break; 439 440 case NETDEV_UNREGISTER: 441 /* twiddle thumbs on netns device moves */ 442 if (dev->reg_state != NETREG_UNREGISTERING) 443 break; 444 445 vlan_group_for_each_dev(grp, i, vlandev) { 446 /* removal of last vid destroys vlan_info, abort 447 * afterwards */ 448 if (vlan_info->nr_vids == 1) 449 last = true; 450 451 unregister_vlan_dev(vlandev, &list); 452 if (last) 453 break; 454 } 455 unregister_netdevice_many(&list); 456 break; 457 458 case NETDEV_PRE_TYPE_CHANGE: 459 /* Forbid underlaying device to change its type. */ 460 if (vlan_uses_dev(dev)) 461 return NOTIFY_BAD; 462 break; 463 464 case NETDEV_NOTIFY_PEERS: 465 case NETDEV_BONDING_FAILOVER: 466 case NETDEV_RESEND_IGMP: 467 /* Propagate to vlan devices */ 468 vlan_group_for_each_dev(grp, i, vlandev) 469 call_netdevice_notifiers(event, vlandev); 470 break; 471 } 472 473 out: 474 return NOTIFY_DONE; 475 } 476 477 static struct notifier_block vlan_notifier_block __read_mostly = { 478 .notifier_call = vlan_device_event, 479 }; 480 481 /* 482 * VLAN IOCTL handler. 483 * o execute requested action or pass command to the device driver 484 * arg is really a struct vlan_ioctl_args __user *. 485 */ 486 static int vlan_ioctl_handler(struct net *net, void __user *arg) 487 { 488 int err; 489 struct vlan_ioctl_args args; 490 struct net_device *dev = NULL; 491 492 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 493 return -EFAULT; 494 495 /* Null terminate this sucker, just in case. */ 496 args.device1[23] = 0; 497 args.u.device2[23] = 0; 498 499 rtnl_lock(); 500 501 switch (args.cmd) { 502 case SET_VLAN_INGRESS_PRIORITY_CMD: 503 case SET_VLAN_EGRESS_PRIORITY_CMD: 504 case SET_VLAN_FLAG_CMD: 505 case ADD_VLAN_CMD: 506 case DEL_VLAN_CMD: 507 case GET_VLAN_REALDEV_NAME_CMD: 508 case GET_VLAN_VID_CMD: 509 err = -ENODEV; 510 dev = __dev_get_by_name(net, args.device1); 511 if (!dev) 512 goto out; 513 514 err = -EINVAL; 515 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 516 goto out; 517 } 518 519 switch (args.cmd) { 520 case SET_VLAN_INGRESS_PRIORITY_CMD: 521 err = -EPERM; 522 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 523 break; 524 vlan_dev_set_ingress_priority(dev, 525 args.u.skb_priority, 526 args.vlan_qos); 527 err = 0; 528 break; 529 530 case SET_VLAN_EGRESS_PRIORITY_CMD: 531 err = -EPERM; 532 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 533 break; 534 err = vlan_dev_set_egress_priority(dev, 535 args.u.skb_priority, 536 args.vlan_qos); 537 break; 538 539 case SET_VLAN_FLAG_CMD: 540 err = -EPERM; 541 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 542 break; 543 err = vlan_dev_change_flags(dev, 544 args.vlan_qos ? args.u.flag : 0, 545 args.u.flag); 546 break; 547 548 case SET_VLAN_NAME_TYPE_CMD: 549 err = -EPERM; 550 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 551 break; 552 if ((args.u.name_type >= 0) && 553 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 554 struct vlan_net *vn; 555 556 vn = net_generic(net, vlan_net_id); 557 vn->name_type = args.u.name_type; 558 err = 0; 559 } else { 560 err = -EINVAL; 561 } 562 break; 563 564 case ADD_VLAN_CMD: 565 err = -EPERM; 566 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 567 break; 568 err = register_vlan_device(dev, args.u.VID); 569 break; 570 571 case DEL_VLAN_CMD: 572 err = -EPERM; 573 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 574 break; 575 unregister_vlan_dev(dev, NULL); 576 err = 0; 577 break; 578 579 case GET_VLAN_REALDEV_NAME_CMD: 580 err = 0; 581 vlan_dev_get_realdev_name(dev, args.u.device2); 582 if (copy_to_user(arg, &args, 583 sizeof(struct vlan_ioctl_args))) 584 err = -EFAULT; 585 break; 586 587 case GET_VLAN_VID_CMD: 588 err = 0; 589 args.u.VID = vlan_dev_vlan_id(dev); 590 if (copy_to_user(arg, &args, 591 sizeof(struct vlan_ioctl_args))) 592 err = -EFAULT; 593 break; 594 595 default: 596 err = -EOPNOTSUPP; 597 break; 598 } 599 out: 600 rtnl_unlock(); 601 return err; 602 } 603 604 static int __net_init vlan_init_net(struct net *net) 605 { 606 struct vlan_net *vn = net_generic(net, vlan_net_id); 607 int err; 608 609 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 610 611 err = vlan_proc_init(net); 612 613 return err; 614 } 615 616 static void __net_exit vlan_exit_net(struct net *net) 617 { 618 vlan_proc_cleanup(net); 619 } 620 621 static struct pernet_operations vlan_net_ops = { 622 .init = vlan_init_net, 623 .exit = vlan_exit_net, 624 .id = &vlan_net_id, 625 .size = sizeof(struct vlan_net), 626 }; 627 628 static int __init vlan_proto_init(void) 629 { 630 int err; 631 632 pr_info("%s v%s\n", vlan_fullname, vlan_version); 633 634 err = register_pernet_subsys(&vlan_net_ops); 635 if (err < 0) 636 goto err0; 637 638 err = register_netdevice_notifier(&vlan_notifier_block); 639 if (err < 0) 640 goto err2; 641 642 err = vlan_gvrp_init(); 643 if (err < 0) 644 goto err3; 645 646 err = vlan_mvrp_init(); 647 if (err < 0) 648 goto err4; 649 650 err = vlan_netlink_init(); 651 if (err < 0) 652 goto err5; 653 654 vlan_ioctl_set(vlan_ioctl_handler); 655 return 0; 656 657 err5: 658 vlan_mvrp_uninit(); 659 err4: 660 vlan_gvrp_uninit(); 661 err3: 662 unregister_netdevice_notifier(&vlan_notifier_block); 663 err2: 664 unregister_pernet_subsys(&vlan_net_ops); 665 err0: 666 return err; 667 } 668 669 static void __exit vlan_cleanup_module(void) 670 { 671 vlan_ioctl_set(NULL); 672 vlan_netlink_fini(); 673 674 unregister_netdevice_notifier(&vlan_notifier_block); 675 676 unregister_pernet_subsys(&vlan_net_ops); 677 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 678 679 vlan_mvrp_uninit(); 680 vlan_gvrp_uninit(); 681 } 682 683 module_init(vlan_proto_init); 684 module_exit(vlan_cleanup_module); 685 686 MODULE_LICENSE("GPL"); 687 MODULE_VERSION(DRV_VERSION); 688