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 /* Because unregister_netdevice_queue() makes sure at least one rcu 102 * grace period is respected before device freeing, 103 * we dont need to call synchronize_net() here. 104 */ 105 unregister_netdevice_queue(dev, head); 106 107 netdev_upper_dev_unlink(real_dev, dev); 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 = netdev_upper_dev_link(real_dev, dev); 173 if (err) 174 goto out_uninit_mvrp; 175 176 err = register_netdevice(dev); 177 if (err < 0) 178 goto out_upper_dev_unlink; 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_upper_dev_unlink: 195 netdev_upper_dev_unlink(real_dev, 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 net *net = dev_net(real_dev); 214 struct vlan_net *vn = net_generic(net, vlan_net_id); 215 char name[IFNAMSIZ]; 216 int err; 217 218 if (vlan_id >= VLAN_VID_MASK) 219 return -ERANGE; 220 221 err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id); 222 if (err < 0) 223 return err; 224 225 /* Gotta set up the fields for the device. */ 226 switch (vn->name_type) { 227 case VLAN_NAME_TYPE_RAW_PLUS_VID: 228 /* name will look like: eth1.0005 */ 229 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id); 230 break; 231 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: 232 /* Put our vlan.VID in the name. 233 * Name will look like: vlan5 234 */ 235 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id); 236 break; 237 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: 238 /* Put our vlan.VID in the name. 239 * Name will look like: eth0.5 240 */ 241 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id); 242 break; 243 case VLAN_NAME_TYPE_PLUS_VID: 244 /* Put our vlan.VID in the name. 245 * Name will look like: vlan0005 246 */ 247 default: 248 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id); 249 } 250 251 new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup); 252 253 if (new_dev == NULL) 254 return -ENOBUFS; 255 256 dev_net_set(new_dev, net); 257 /* need 4 bytes for extra VLAN header info, 258 * hope the underlying device can handle it. 259 */ 260 new_dev->mtu = real_dev->mtu; 261 new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT); 262 263 vlan_dev_priv(new_dev)->vlan_proto = htons(ETH_P_8021Q); 264 vlan_dev_priv(new_dev)->vlan_id = vlan_id; 265 vlan_dev_priv(new_dev)->real_dev = real_dev; 266 vlan_dev_priv(new_dev)->dent = NULL; 267 vlan_dev_priv(new_dev)->flags = VLAN_FLAG_REORDER_HDR; 268 269 new_dev->rtnl_link_ops = &vlan_link_ops; 270 err = register_vlan_dev(new_dev); 271 if (err < 0) 272 goto out_free_newdev; 273 274 return 0; 275 276 out_free_newdev: 277 free_netdev(new_dev); 278 return err; 279 } 280 281 static void vlan_sync_address(struct net_device *dev, 282 struct net_device *vlandev) 283 { 284 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 285 286 /* May be called without an actual change */ 287 if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr)) 288 return; 289 290 /* vlan address was different from the old address and is equal to 291 * the new address */ 292 if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 293 ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 294 dev_uc_del(dev, vlandev->dev_addr); 295 296 /* vlan address was equal to the old address and is different from 297 * the new address */ 298 if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 299 !ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 300 dev_uc_add(dev, vlandev->dev_addr); 301 302 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); 303 } 304 305 static void vlan_transfer_features(struct net_device *dev, 306 struct net_device *vlandev) 307 { 308 vlandev->gso_max_size = dev->gso_max_size; 309 310 if (dev->features & NETIF_F_HW_VLAN_CTAG_TX) 311 vlandev->hard_header_len = dev->hard_header_len; 312 else 313 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN; 314 315 #if IS_ENABLED(CONFIG_FCOE) 316 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 317 #endif 318 319 netdev_update_features(vlandev); 320 } 321 322 static void __vlan_device_event(struct net_device *dev, unsigned long event) 323 { 324 switch (event) { 325 case NETDEV_CHANGENAME: 326 vlan_proc_rem_dev(dev); 327 if (vlan_proc_add_dev(dev) < 0) 328 pr_warn("failed to change proc name for %s\n", 329 dev->name); 330 break; 331 case NETDEV_REGISTER: 332 if (vlan_proc_add_dev(dev) < 0) 333 pr_warn("failed to add proc entry for %s\n", dev->name); 334 break; 335 case NETDEV_UNREGISTER: 336 vlan_proc_rem_dev(dev); 337 break; 338 } 339 } 340 341 static int vlan_device_event(struct notifier_block *unused, unsigned long event, 342 void *ptr) 343 { 344 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 345 struct vlan_group *grp; 346 struct vlan_info *vlan_info; 347 int i, flgs; 348 struct net_device *vlandev; 349 struct vlan_dev_priv *vlan; 350 bool last = false; 351 LIST_HEAD(list); 352 353 if (is_vlan_dev(dev)) 354 __vlan_device_event(dev, event); 355 356 if ((event == NETDEV_UP) && 357 (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) { 358 pr_info("adding VLAN 0 to HW filter on device %s\n", 359 dev->name); 360 vlan_vid_add(dev, htons(ETH_P_8021Q), 0); 361 } 362 363 vlan_info = rtnl_dereference(dev->vlan_info); 364 if (!vlan_info) 365 goto out; 366 grp = &vlan_info->grp; 367 368 /* It is OK that we do not hold the group lock right now, 369 * as we run under the RTNL lock. 370 */ 371 372 switch (event) { 373 case NETDEV_CHANGE: 374 /* Propagate real device state to vlan devices */ 375 vlan_group_for_each_dev(grp, i, vlandev) 376 netif_stacked_transfer_operstate(dev, vlandev); 377 break; 378 379 case NETDEV_CHANGEADDR: 380 /* Adjust unicast filters on underlying device */ 381 vlan_group_for_each_dev(grp, i, vlandev) { 382 flgs = vlandev->flags; 383 if (!(flgs & IFF_UP)) 384 continue; 385 386 vlan_sync_address(dev, vlandev); 387 } 388 break; 389 390 case NETDEV_CHANGEMTU: 391 vlan_group_for_each_dev(grp, i, vlandev) { 392 if (vlandev->mtu <= dev->mtu) 393 continue; 394 395 dev_set_mtu(vlandev, dev->mtu); 396 } 397 break; 398 399 case NETDEV_FEAT_CHANGE: 400 /* Propagate device features to underlying device */ 401 vlan_group_for_each_dev(grp, i, vlandev) 402 vlan_transfer_features(dev, vlandev); 403 break; 404 405 case NETDEV_DOWN: 406 if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) 407 vlan_vid_del(dev, htons(ETH_P_8021Q), 0); 408 409 /* Put all VLANs for this dev in the down state too. */ 410 vlan_group_for_each_dev(grp, i, vlandev) { 411 flgs = vlandev->flags; 412 if (!(flgs & IFF_UP)) 413 continue; 414 415 vlan = vlan_dev_priv(vlandev); 416 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 417 dev_change_flags(vlandev, flgs & ~IFF_UP); 418 netif_stacked_transfer_operstate(dev, vlandev); 419 } 420 break; 421 422 case NETDEV_UP: 423 /* Put all VLANs for this dev in the up state too. */ 424 vlan_group_for_each_dev(grp, i, vlandev) { 425 flgs = vlandev->flags; 426 if (flgs & IFF_UP) 427 continue; 428 429 vlan = vlan_dev_priv(vlandev); 430 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 431 dev_change_flags(vlandev, flgs | IFF_UP); 432 netif_stacked_transfer_operstate(dev, vlandev); 433 } 434 break; 435 436 case NETDEV_UNREGISTER: 437 /* twiddle thumbs on netns device moves */ 438 if (dev->reg_state != NETREG_UNREGISTERING) 439 break; 440 441 vlan_group_for_each_dev(grp, i, vlandev) { 442 /* removal of last vid destroys vlan_info, abort 443 * afterwards */ 444 if (vlan_info->nr_vids == 1) 445 last = true; 446 447 unregister_vlan_dev(vlandev, &list); 448 if (last) 449 break; 450 } 451 unregister_netdevice_many(&list); 452 break; 453 454 case NETDEV_PRE_TYPE_CHANGE: 455 /* Forbid underlaying device to change its type. */ 456 if (vlan_uses_dev(dev)) 457 return NOTIFY_BAD; 458 break; 459 460 case NETDEV_NOTIFY_PEERS: 461 case NETDEV_BONDING_FAILOVER: 462 /* Propagate to vlan devices */ 463 vlan_group_for_each_dev(grp, i, vlandev) 464 call_netdevice_notifiers(event, vlandev); 465 break; 466 } 467 468 out: 469 return NOTIFY_DONE; 470 } 471 472 static struct notifier_block vlan_notifier_block __read_mostly = { 473 .notifier_call = vlan_device_event, 474 }; 475 476 /* 477 * VLAN IOCTL handler. 478 * o execute requested action or pass command to the device driver 479 * arg is really a struct vlan_ioctl_args __user *. 480 */ 481 static int vlan_ioctl_handler(struct net *net, void __user *arg) 482 { 483 int err; 484 struct vlan_ioctl_args args; 485 struct net_device *dev = NULL; 486 487 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 488 return -EFAULT; 489 490 /* Null terminate this sucker, just in case. */ 491 args.device1[23] = 0; 492 args.u.device2[23] = 0; 493 494 rtnl_lock(); 495 496 switch (args.cmd) { 497 case SET_VLAN_INGRESS_PRIORITY_CMD: 498 case SET_VLAN_EGRESS_PRIORITY_CMD: 499 case SET_VLAN_FLAG_CMD: 500 case ADD_VLAN_CMD: 501 case DEL_VLAN_CMD: 502 case GET_VLAN_REALDEV_NAME_CMD: 503 case GET_VLAN_VID_CMD: 504 err = -ENODEV; 505 dev = __dev_get_by_name(net, args.device1); 506 if (!dev) 507 goto out; 508 509 err = -EINVAL; 510 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 511 goto out; 512 } 513 514 switch (args.cmd) { 515 case SET_VLAN_INGRESS_PRIORITY_CMD: 516 err = -EPERM; 517 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 518 break; 519 vlan_dev_set_ingress_priority(dev, 520 args.u.skb_priority, 521 args.vlan_qos); 522 err = 0; 523 break; 524 525 case SET_VLAN_EGRESS_PRIORITY_CMD: 526 err = -EPERM; 527 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 528 break; 529 err = vlan_dev_set_egress_priority(dev, 530 args.u.skb_priority, 531 args.vlan_qos); 532 break; 533 534 case SET_VLAN_FLAG_CMD: 535 err = -EPERM; 536 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 537 break; 538 err = vlan_dev_change_flags(dev, 539 args.vlan_qos ? args.u.flag : 0, 540 args.u.flag); 541 break; 542 543 case SET_VLAN_NAME_TYPE_CMD: 544 err = -EPERM; 545 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 546 break; 547 if ((args.u.name_type >= 0) && 548 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 549 struct vlan_net *vn; 550 551 vn = net_generic(net, vlan_net_id); 552 vn->name_type = args.u.name_type; 553 err = 0; 554 } else { 555 err = -EINVAL; 556 } 557 break; 558 559 case ADD_VLAN_CMD: 560 err = -EPERM; 561 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 562 break; 563 err = register_vlan_device(dev, args.u.VID); 564 break; 565 566 case DEL_VLAN_CMD: 567 err = -EPERM; 568 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 569 break; 570 unregister_vlan_dev(dev, NULL); 571 err = 0; 572 break; 573 574 case GET_VLAN_REALDEV_NAME_CMD: 575 err = 0; 576 vlan_dev_get_realdev_name(dev, args.u.device2); 577 if (copy_to_user(arg, &args, 578 sizeof(struct vlan_ioctl_args))) 579 err = -EFAULT; 580 break; 581 582 case GET_VLAN_VID_CMD: 583 err = 0; 584 args.u.VID = vlan_dev_vlan_id(dev); 585 if (copy_to_user(arg, &args, 586 sizeof(struct vlan_ioctl_args))) 587 err = -EFAULT; 588 break; 589 590 default: 591 err = -EOPNOTSUPP; 592 break; 593 } 594 out: 595 rtnl_unlock(); 596 return err; 597 } 598 599 static int __net_init vlan_init_net(struct net *net) 600 { 601 struct vlan_net *vn = net_generic(net, vlan_net_id); 602 int err; 603 604 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 605 606 err = vlan_proc_init(net); 607 608 return err; 609 } 610 611 static void __net_exit vlan_exit_net(struct net *net) 612 { 613 vlan_proc_cleanup(net); 614 } 615 616 static struct pernet_operations vlan_net_ops = { 617 .init = vlan_init_net, 618 .exit = vlan_exit_net, 619 .id = &vlan_net_id, 620 .size = sizeof(struct vlan_net), 621 }; 622 623 static int __init vlan_proto_init(void) 624 { 625 int err; 626 627 pr_info("%s v%s\n", vlan_fullname, vlan_version); 628 629 err = register_pernet_subsys(&vlan_net_ops); 630 if (err < 0) 631 goto err0; 632 633 err = register_netdevice_notifier(&vlan_notifier_block); 634 if (err < 0) 635 goto err2; 636 637 err = vlan_gvrp_init(); 638 if (err < 0) 639 goto err3; 640 641 err = vlan_mvrp_init(); 642 if (err < 0) 643 goto err4; 644 645 err = vlan_netlink_init(); 646 if (err < 0) 647 goto err5; 648 649 vlan_ioctl_set(vlan_ioctl_handler); 650 return 0; 651 652 err5: 653 vlan_mvrp_uninit(); 654 err4: 655 vlan_gvrp_uninit(); 656 err3: 657 unregister_netdevice_notifier(&vlan_notifier_block); 658 err2: 659 unregister_pernet_subsys(&vlan_net_ops); 660 err0: 661 return err; 662 } 663 664 static void __exit vlan_cleanup_module(void) 665 { 666 vlan_ioctl_set(NULL); 667 vlan_netlink_fini(); 668 669 unregister_netdevice_notifier(&vlan_notifier_block); 670 671 unregister_pernet_subsys(&vlan_net_ops); 672 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 673 674 vlan_mvrp_uninit(); 675 vlan_gvrp_uninit(); 676 } 677 678 module_init(vlan_proto_init); 679 module_exit(vlan_cleanup_module); 680 681 MODULE_LICENSE("GPL"); 682 MODULE_VERSION(DRV_VERSION); 683