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 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); 305 } 306 307 static void vlan_transfer_features(struct net_device *dev, 308 struct net_device *vlandev) 309 { 310 vlandev->gso_max_size = dev->gso_max_size; 311 312 if (dev->features & NETIF_F_HW_VLAN_CTAG_TX) 313 vlandev->hard_header_len = dev->hard_header_len; 314 else 315 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN; 316 317 #if IS_ENABLED(CONFIG_FCOE) 318 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 319 #endif 320 321 netdev_update_features(vlandev); 322 } 323 324 static void __vlan_device_event(struct net_device *dev, unsigned long event) 325 { 326 switch (event) { 327 case NETDEV_CHANGENAME: 328 vlan_proc_rem_dev(dev); 329 if (vlan_proc_add_dev(dev) < 0) 330 pr_warn("failed to change proc name for %s\n", 331 dev->name); 332 break; 333 case NETDEV_REGISTER: 334 if (vlan_proc_add_dev(dev) < 0) 335 pr_warn("failed to add proc entry for %s\n", dev->name); 336 break; 337 case NETDEV_UNREGISTER: 338 vlan_proc_rem_dev(dev); 339 break; 340 } 341 } 342 343 static int vlan_device_event(struct notifier_block *unused, unsigned long event, 344 void *ptr) 345 { 346 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 347 struct vlan_group *grp; 348 struct vlan_info *vlan_info; 349 int i, flgs; 350 struct net_device *vlandev; 351 struct vlan_dev_priv *vlan; 352 bool last = false; 353 LIST_HEAD(list); 354 355 if (is_vlan_dev(dev)) 356 __vlan_device_event(dev, event); 357 358 if ((event == NETDEV_UP) && 359 (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) { 360 pr_info("adding VLAN 0 to HW filter on device %s\n", 361 dev->name); 362 vlan_vid_add(dev, htons(ETH_P_8021Q), 0); 363 } 364 365 vlan_info = rtnl_dereference(dev->vlan_info); 366 if (!vlan_info) 367 goto out; 368 grp = &vlan_info->grp; 369 370 /* It is OK that we do not hold the group lock right now, 371 * as we run under the RTNL lock. 372 */ 373 374 switch (event) { 375 case NETDEV_CHANGE: 376 /* Propagate real device state to vlan devices */ 377 vlan_group_for_each_dev(grp, i, vlandev) 378 netif_stacked_transfer_operstate(dev, vlandev); 379 break; 380 381 case NETDEV_CHANGEADDR: 382 /* Adjust unicast filters on underlying device */ 383 vlan_group_for_each_dev(grp, i, vlandev) { 384 flgs = vlandev->flags; 385 if (!(flgs & IFF_UP)) 386 continue; 387 388 vlan_sync_address(dev, vlandev); 389 } 390 break; 391 392 case NETDEV_CHANGEMTU: 393 vlan_group_for_each_dev(grp, i, vlandev) { 394 if (vlandev->mtu <= dev->mtu) 395 continue; 396 397 dev_set_mtu(vlandev, dev->mtu); 398 } 399 break; 400 401 case NETDEV_FEAT_CHANGE: 402 /* Propagate device features to underlying device */ 403 vlan_group_for_each_dev(grp, i, vlandev) 404 vlan_transfer_features(dev, vlandev); 405 break; 406 407 case NETDEV_DOWN: 408 if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) 409 vlan_vid_del(dev, htons(ETH_P_8021Q), 0); 410 411 /* Put all VLANs for this dev in the down state too. */ 412 vlan_group_for_each_dev(grp, i, vlandev) { 413 flgs = vlandev->flags; 414 if (!(flgs & IFF_UP)) 415 continue; 416 417 vlan = vlan_dev_priv(vlandev); 418 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 419 dev_change_flags(vlandev, flgs & ~IFF_UP); 420 netif_stacked_transfer_operstate(dev, vlandev); 421 } 422 break; 423 424 case NETDEV_UP: 425 /* Put all VLANs for this dev in the up state too. */ 426 vlan_group_for_each_dev(grp, i, vlandev) { 427 flgs = vlandev->flags; 428 if (flgs & IFF_UP) 429 continue; 430 431 vlan = vlan_dev_priv(vlandev); 432 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 433 dev_change_flags(vlandev, flgs | IFF_UP); 434 netif_stacked_transfer_operstate(dev, vlandev); 435 } 436 break; 437 438 case NETDEV_UNREGISTER: 439 /* twiddle thumbs on netns device moves */ 440 if (dev->reg_state != NETREG_UNREGISTERING) 441 break; 442 443 vlan_group_for_each_dev(grp, i, vlandev) { 444 /* removal of last vid destroys vlan_info, abort 445 * afterwards */ 446 if (vlan_info->nr_vids == 1) 447 last = true; 448 449 unregister_vlan_dev(vlandev, &list); 450 if (last) 451 break; 452 } 453 unregister_netdevice_many(&list); 454 break; 455 456 case NETDEV_PRE_TYPE_CHANGE: 457 /* Forbid underlaying device to change its type. */ 458 if (vlan_uses_dev(dev)) 459 return NOTIFY_BAD; 460 break; 461 462 case NETDEV_NOTIFY_PEERS: 463 case NETDEV_BONDING_FAILOVER: 464 case NETDEV_RESEND_IGMP: 465 /* Propagate to vlan devices */ 466 vlan_group_for_each_dev(grp, i, vlandev) 467 call_netdevice_notifiers(event, vlandev); 468 break; 469 } 470 471 out: 472 return NOTIFY_DONE; 473 } 474 475 static struct notifier_block vlan_notifier_block __read_mostly = { 476 .notifier_call = vlan_device_event, 477 }; 478 479 /* 480 * VLAN IOCTL handler. 481 * o execute requested action or pass command to the device driver 482 * arg is really a struct vlan_ioctl_args __user *. 483 */ 484 static int vlan_ioctl_handler(struct net *net, void __user *arg) 485 { 486 int err; 487 struct vlan_ioctl_args args; 488 struct net_device *dev = NULL; 489 490 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 491 return -EFAULT; 492 493 /* Null terminate this sucker, just in case. */ 494 args.device1[23] = 0; 495 args.u.device2[23] = 0; 496 497 rtnl_lock(); 498 499 switch (args.cmd) { 500 case SET_VLAN_INGRESS_PRIORITY_CMD: 501 case SET_VLAN_EGRESS_PRIORITY_CMD: 502 case SET_VLAN_FLAG_CMD: 503 case ADD_VLAN_CMD: 504 case DEL_VLAN_CMD: 505 case GET_VLAN_REALDEV_NAME_CMD: 506 case GET_VLAN_VID_CMD: 507 err = -ENODEV; 508 dev = __dev_get_by_name(net, args.device1); 509 if (!dev) 510 goto out; 511 512 err = -EINVAL; 513 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 514 goto out; 515 } 516 517 switch (args.cmd) { 518 case SET_VLAN_INGRESS_PRIORITY_CMD: 519 err = -EPERM; 520 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 521 break; 522 vlan_dev_set_ingress_priority(dev, 523 args.u.skb_priority, 524 args.vlan_qos); 525 err = 0; 526 break; 527 528 case SET_VLAN_EGRESS_PRIORITY_CMD: 529 err = -EPERM; 530 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 531 break; 532 err = vlan_dev_set_egress_priority(dev, 533 args.u.skb_priority, 534 args.vlan_qos); 535 break; 536 537 case SET_VLAN_FLAG_CMD: 538 err = -EPERM; 539 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 540 break; 541 err = vlan_dev_change_flags(dev, 542 args.vlan_qos ? args.u.flag : 0, 543 args.u.flag); 544 break; 545 546 case SET_VLAN_NAME_TYPE_CMD: 547 err = -EPERM; 548 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 549 break; 550 if ((args.u.name_type >= 0) && 551 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 552 struct vlan_net *vn; 553 554 vn = net_generic(net, vlan_net_id); 555 vn->name_type = args.u.name_type; 556 err = 0; 557 } else { 558 err = -EINVAL; 559 } 560 break; 561 562 case ADD_VLAN_CMD: 563 err = -EPERM; 564 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 565 break; 566 err = register_vlan_device(dev, args.u.VID); 567 break; 568 569 case DEL_VLAN_CMD: 570 err = -EPERM; 571 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 572 break; 573 unregister_vlan_dev(dev, NULL); 574 err = 0; 575 break; 576 577 case GET_VLAN_REALDEV_NAME_CMD: 578 err = 0; 579 vlan_dev_get_realdev_name(dev, args.u.device2); 580 if (copy_to_user(arg, &args, 581 sizeof(struct vlan_ioctl_args))) 582 err = -EFAULT; 583 break; 584 585 case GET_VLAN_VID_CMD: 586 err = 0; 587 args.u.VID = vlan_dev_vlan_id(dev); 588 if (copy_to_user(arg, &args, 589 sizeof(struct vlan_ioctl_args))) 590 err = -EFAULT; 591 break; 592 593 default: 594 err = -EOPNOTSUPP; 595 break; 596 } 597 out: 598 rtnl_unlock(); 599 return err; 600 } 601 602 static int __net_init vlan_init_net(struct net *net) 603 { 604 struct vlan_net *vn = net_generic(net, vlan_net_id); 605 int err; 606 607 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 608 609 err = vlan_proc_init(net); 610 611 return err; 612 } 613 614 static void __net_exit vlan_exit_net(struct net *net) 615 { 616 vlan_proc_cleanup(net); 617 } 618 619 static struct pernet_operations vlan_net_ops = { 620 .init = vlan_init_net, 621 .exit = vlan_exit_net, 622 .id = &vlan_net_id, 623 .size = sizeof(struct vlan_net), 624 }; 625 626 static int __init vlan_proto_init(void) 627 { 628 int err; 629 630 pr_info("%s v%s\n", vlan_fullname, vlan_version); 631 632 err = register_pernet_subsys(&vlan_net_ops); 633 if (err < 0) 634 goto err0; 635 636 err = register_netdevice_notifier(&vlan_notifier_block); 637 if (err < 0) 638 goto err2; 639 640 err = vlan_gvrp_init(); 641 if (err < 0) 642 goto err3; 643 644 err = vlan_mvrp_init(); 645 if (err < 0) 646 goto err4; 647 648 err = vlan_netlink_init(); 649 if (err < 0) 650 goto err5; 651 652 vlan_ioctl_set(vlan_ioctl_handler); 653 return 0; 654 655 err5: 656 vlan_mvrp_uninit(); 657 err4: 658 vlan_gvrp_uninit(); 659 err3: 660 unregister_netdevice_notifier(&vlan_notifier_block); 661 err2: 662 unregister_pernet_subsys(&vlan_net_ops); 663 err0: 664 return err; 665 } 666 667 static void __exit vlan_cleanup_module(void) 668 { 669 vlan_ioctl_set(NULL); 670 vlan_netlink_fini(); 671 672 unregister_netdevice_notifier(&vlan_notifier_block); 673 674 unregister_pernet_subsys(&vlan_net_ops); 675 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 676 677 vlan_mvrp_uninit(); 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