1 /* 2 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 of 7 * the License, or (at your option) any later version. 8 * 9 * The code this is based on carried the following copyright notice: 10 * --- 11 * (C) Copyright 2001-2006 12 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com 13 * Re-worked by Ben Greear <greearb@candelatech.com> 14 * --- 15 */ 16 #include <linux/kernel.h> 17 #include <linux/types.h> 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/errno.h> 21 #include <linux/slab.h> 22 #include <linux/string.h> 23 #include <linux/rculist.h> 24 #include <linux/notifier.h> 25 #include <linux/netdevice.h> 26 #include <linux/etherdevice.h> 27 #include <linux/ethtool.h> 28 #include <linux/if_arp.h> 29 #include <linux/if_link.h> 30 #include <linux/if_macvlan.h> 31 #include <net/rtnetlink.h> 32 #include <net/xfrm.h> 33 34 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE) 35 36 struct macvlan_port { 37 struct net_device *dev; 38 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 39 struct list_head vlans; 40 }; 41 42 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 43 const unsigned char *addr) 44 { 45 struct macvlan_dev *vlan; 46 struct hlist_node *n; 47 48 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) { 49 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr)) 50 return vlan; 51 } 52 return NULL; 53 } 54 55 static void macvlan_hash_add(struct macvlan_dev *vlan) 56 { 57 struct macvlan_port *port = vlan->port; 58 const unsigned char *addr = vlan->dev->dev_addr; 59 60 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); 61 } 62 63 static void macvlan_hash_del(struct macvlan_dev *vlan) 64 { 65 hlist_del_rcu(&vlan->hlist); 66 synchronize_rcu(); 67 } 68 69 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 70 const unsigned char *addr) 71 { 72 macvlan_hash_del(vlan); 73 /* Now that we are unhashed it is safe to change the device 74 * address without confusing packet delivery. 75 */ 76 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 77 macvlan_hash_add(vlan); 78 } 79 80 static int macvlan_addr_busy(const struct macvlan_port *port, 81 const unsigned char *addr) 82 { 83 /* Test to see if the specified multicast address is 84 * currently in use by the underlying device or 85 * another macvlan. 86 */ 87 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr)) 88 return 1; 89 90 if (macvlan_hash_lookup(port, addr)) 91 return 1; 92 93 return 0; 94 } 95 96 97 static int macvlan_broadcast_one(struct sk_buff *skb, 98 const struct macvlan_dev *vlan, 99 const struct ethhdr *eth, bool local) 100 { 101 struct net_device *dev = vlan->dev; 102 if (!skb) 103 return NET_RX_DROP; 104 105 if (local) 106 return vlan->forward(dev, skb); 107 108 skb->dev = dev; 109 if (!compare_ether_addr_64bits(eth->h_dest, 110 dev->broadcast)) 111 skb->pkt_type = PACKET_BROADCAST; 112 else 113 skb->pkt_type = PACKET_MULTICAST; 114 115 return vlan->receive(skb); 116 } 117 118 static void macvlan_broadcast(struct sk_buff *skb, 119 const struct macvlan_port *port, 120 struct net_device *src, 121 enum macvlan_mode mode) 122 { 123 const struct ethhdr *eth = eth_hdr(skb); 124 const struct macvlan_dev *vlan; 125 struct hlist_node *n; 126 struct sk_buff *nskb; 127 unsigned int i; 128 int err; 129 130 if (skb->protocol == htons(ETH_P_PAUSE)) 131 return; 132 133 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 134 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) { 135 if (vlan->dev == src || !(vlan->mode & mode)) 136 continue; 137 138 nskb = skb_clone(skb, GFP_ATOMIC); 139 err = macvlan_broadcast_one(nskb, vlan, eth, 140 mode == MACVLAN_MODE_BRIDGE); 141 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 142 err == NET_RX_SUCCESS, 1); 143 } 144 } 145 } 146 147 /* called under rcu_read_lock() from netif_receive_skb */ 148 static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb) 149 { 150 const struct ethhdr *eth = eth_hdr(skb); 151 const struct macvlan_port *port; 152 const struct macvlan_dev *vlan; 153 const struct macvlan_dev *src; 154 struct net_device *dev; 155 unsigned int len; 156 157 port = rcu_dereference(skb->dev->macvlan_port); 158 if (port == NULL) 159 return skb; 160 161 if (is_multicast_ether_addr(eth->h_dest)) { 162 src = macvlan_hash_lookup(port, eth->h_source); 163 if (!src) 164 /* frame comes from an external address */ 165 macvlan_broadcast(skb, port, NULL, 166 MACVLAN_MODE_PRIVATE | 167 MACVLAN_MODE_VEPA | 168 MACVLAN_MODE_BRIDGE); 169 else if (src->mode == MACVLAN_MODE_VEPA) 170 /* flood to everyone except source */ 171 macvlan_broadcast(skb, port, src->dev, 172 MACVLAN_MODE_VEPA | 173 MACVLAN_MODE_BRIDGE); 174 else if (src->mode == MACVLAN_MODE_BRIDGE) 175 /* 176 * flood only to VEPA ports, bridge ports 177 * already saw the frame on the way out. 178 */ 179 macvlan_broadcast(skb, port, src->dev, 180 MACVLAN_MODE_VEPA); 181 return skb; 182 } 183 184 vlan = macvlan_hash_lookup(port, eth->h_dest); 185 if (vlan == NULL) 186 return skb; 187 188 dev = vlan->dev; 189 if (unlikely(!(dev->flags & IFF_UP))) { 190 kfree_skb(skb); 191 return NULL; 192 } 193 len = skb->len + ETH_HLEN; 194 skb = skb_share_check(skb, GFP_ATOMIC); 195 macvlan_count_rx(vlan, len, skb != NULL, 0); 196 if (!skb) 197 return NULL; 198 199 skb->dev = dev; 200 skb->pkt_type = PACKET_HOST; 201 202 vlan->receive(skb); 203 return NULL; 204 } 205 206 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 207 { 208 const struct macvlan_dev *vlan = netdev_priv(dev); 209 const struct macvlan_port *port = vlan->port; 210 const struct macvlan_dev *dest; 211 212 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 213 const struct ethhdr *eth = (void *)skb->data; 214 215 /* send to other bridge ports directly */ 216 if (is_multicast_ether_addr(eth->h_dest)) { 217 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 218 goto xmit_world; 219 } 220 221 dest = macvlan_hash_lookup(port, eth->h_dest); 222 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 223 unsigned int length = skb->len + ETH_HLEN; 224 int ret = dest->forward(dest->dev, skb); 225 macvlan_count_rx(dest, length, 226 ret == NET_RX_SUCCESS, 0); 227 228 return NET_XMIT_SUCCESS; 229 } 230 } 231 232 xmit_world: 233 skb_set_dev(skb, vlan->lowerdev); 234 return dev_queue_xmit(skb); 235 } 236 237 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 238 struct net_device *dev) 239 { 240 int i = skb_get_queue_mapping(skb); 241 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 242 unsigned int len = skb->len; 243 int ret; 244 245 ret = macvlan_queue_xmit(skb, dev); 246 if (likely(ret == NET_XMIT_SUCCESS)) { 247 txq->tx_packets++; 248 txq->tx_bytes += len; 249 } else 250 txq->tx_dropped++; 251 252 return ret; 253 } 254 EXPORT_SYMBOL_GPL(macvlan_start_xmit); 255 256 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 257 unsigned short type, const void *daddr, 258 const void *saddr, unsigned len) 259 { 260 const struct macvlan_dev *vlan = netdev_priv(dev); 261 struct net_device *lowerdev = vlan->lowerdev; 262 263 return dev_hard_header(skb, lowerdev, type, daddr, 264 saddr ? : dev->dev_addr, len); 265 } 266 267 static const struct header_ops macvlan_hard_header_ops = { 268 .create = macvlan_hard_header, 269 .rebuild = eth_rebuild_header, 270 .parse = eth_header_parse, 271 .cache = eth_header_cache, 272 .cache_update = eth_header_cache_update, 273 }; 274 275 static int macvlan_open(struct net_device *dev) 276 { 277 struct macvlan_dev *vlan = netdev_priv(dev); 278 struct net_device *lowerdev = vlan->lowerdev; 279 int err; 280 281 err = -EBUSY; 282 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 283 goto out; 284 285 err = dev_unicast_add(lowerdev, dev->dev_addr); 286 if (err < 0) 287 goto out; 288 if (dev->flags & IFF_ALLMULTI) { 289 err = dev_set_allmulti(lowerdev, 1); 290 if (err < 0) 291 goto del_unicast; 292 } 293 macvlan_hash_add(vlan); 294 return 0; 295 296 del_unicast: 297 dev_unicast_delete(lowerdev, dev->dev_addr); 298 out: 299 return err; 300 } 301 302 static int macvlan_stop(struct net_device *dev) 303 { 304 struct macvlan_dev *vlan = netdev_priv(dev); 305 struct net_device *lowerdev = vlan->lowerdev; 306 307 dev_mc_unsync(lowerdev, dev); 308 if (dev->flags & IFF_ALLMULTI) 309 dev_set_allmulti(lowerdev, -1); 310 311 dev_unicast_delete(lowerdev, dev->dev_addr); 312 313 macvlan_hash_del(vlan); 314 return 0; 315 } 316 317 static int macvlan_set_mac_address(struct net_device *dev, void *p) 318 { 319 struct macvlan_dev *vlan = netdev_priv(dev); 320 struct net_device *lowerdev = vlan->lowerdev; 321 struct sockaddr *addr = p; 322 int err; 323 324 if (!is_valid_ether_addr(addr->sa_data)) 325 return -EADDRNOTAVAIL; 326 327 if (!(dev->flags & IFF_UP)) { 328 /* Just copy in the new address */ 329 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 330 } else { 331 /* Rehash and update the device filters */ 332 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 333 return -EBUSY; 334 335 err = dev_unicast_add(lowerdev, addr->sa_data); 336 if (err) 337 return err; 338 339 dev_unicast_delete(lowerdev, dev->dev_addr); 340 341 macvlan_hash_change_addr(vlan, addr->sa_data); 342 } 343 return 0; 344 } 345 346 static void macvlan_change_rx_flags(struct net_device *dev, int change) 347 { 348 struct macvlan_dev *vlan = netdev_priv(dev); 349 struct net_device *lowerdev = vlan->lowerdev; 350 351 if (change & IFF_ALLMULTI) 352 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 353 } 354 355 static void macvlan_set_multicast_list(struct net_device *dev) 356 { 357 struct macvlan_dev *vlan = netdev_priv(dev); 358 359 dev_mc_sync(vlan->lowerdev, dev); 360 } 361 362 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 363 { 364 struct macvlan_dev *vlan = netdev_priv(dev); 365 366 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 367 return -EINVAL; 368 dev->mtu = new_mtu; 369 return 0; 370 } 371 372 /* 373 * macvlan network devices have devices nesting below it and are a special 374 * "super class" of normal network devices; split their locks off into a 375 * separate class since they always nest. 376 */ 377 static struct lock_class_key macvlan_netdev_xmit_lock_key; 378 static struct lock_class_key macvlan_netdev_addr_lock_key; 379 380 #define MACVLAN_FEATURES \ 381 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 382 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 383 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO) 384 385 #define MACVLAN_STATE_MASK \ 386 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 387 388 static void macvlan_set_lockdep_class_one(struct net_device *dev, 389 struct netdev_queue *txq, 390 void *_unused) 391 { 392 lockdep_set_class(&txq->_xmit_lock, 393 &macvlan_netdev_xmit_lock_key); 394 } 395 396 static void macvlan_set_lockdep_class(struct net_device *dev) 397 { 398 lockdep_set_class(&dev->addr_list_lock, 399 &macvlan_netdev_addr_lock_key); 400 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 401 } 402 403 static int macvlan_init(struct net_device *dev) 404 { 405 struct macvlan_dev *vlan = netdev_priv(dev); 406 const struct net_device *lowerdev = vlan->lowerdev; 407 408 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 409 (lowerdev->state & MACVLAN_STATE_MASK); 410 dev->features = lowerdev->features & MACVLAN_FEATURES; 411 dev->gso_max_size = lowerdev->gso_max_size; 412 dev->iflink = lowerdev->ifindex; 413 dev->hard_header_len = lowerdev->hard_header_len; 414 415 macvlan_set_lockdep_class(dev); 416 417 vlan->rx_stats = alloc_percpu(struct macvlan_rx_stats); 418 if (!vlan->rx_stats) 419 return -ENOMEM; 420 421 return 0; 422 } 423 424 static void macvlan_uninit(struct net_device *dev) 425 { 426 struct macvlan_dev *vlan = netdev_priv(dev); 427 428 free_percpu(vlan->rx_stats); 429 } 430 431 static struct net_device_stats *macvlan_dev_get_stats(struct net_device *dev) 432 { 433 struct net_device_stats *stats = &dev->stats; 434 struct macvlan_dev *vlan = netdev_priv(dev); 435 436 dev_txq_stats_fold(dev, stats); 437 438 if (vlan->rx_stats) { 439 struct macvlan_rx_stats *p, rx = {0}; 440 int i; 441 442 for_each_possible_cpu(i) { 443 p = per_cpu_ptr(vlan->rx_stats, i); 444 rx.rx_packets += p->rx_packets; 445 rx.rx_bytes += p->rx_bytes; 446 rx.rx_errors += p->rx_errors; 447 rx.multicast += p->multicast; 448 } 449 stats->rx_packets = rx.rx_packets; 450 stats->rx_bytes = rx.rx_bytes; 451 stats->rx_errors = rx.rx_errors; 452 stats->rx_dropped = rx.rx_errors; 453 stats->multicast = rx.multicast; 454 } 455 return stats; 456 } 457 458 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 459 struct ethtool_drvinfo *drvinfo) 460 { 461 snprintf(drvinfo->driver, 32, "macvlan"); 462 snprintf(drvinfo->version, 32, "0.1"); 463 } 464 465 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev) 466 { 467 const struct macvlan_dev *vlan = netdev_priv(dev); 468 return dev_ethtool_get_rx_csum(vlan->lowerdev); 469 } 470 471 static int macvlan_ethtool_get_settings(struct net_device *dev, 472 struct ethtool_cmd *cmd) 473 { 474 const struct macvlan_dev *vlan = netdev_priv(dev); 475 return dev_ethtool_get_settings(vlan->lowerdev, cmd); 476 } 477 478 static u32 macvlan_ethtool_get_flags(struct net_device *dev) 479 { 480 const struct macvlan_dev *vlan = netdev_priv(dev); 481 return dev_ethtool_get_flags(vlan->lowerdev); 482 } 483 484 static const struct ethtool_ops macvlan_ethtool_ops = { 485 .get_link = ethtool_op_get_link, 486 .get_settings = macvlan_ethtool_get_settings, 487 .get_rx_csum = macvlan_ethtool_get_rx_csum, 488 .get_drvinfo = macvlan_ethtool_get_drvinfo, 489 .get_flags = macvlan_ethtool_get_flags, 490 }; 491 492 static const struct net_device_ops macvlan_netdev_ops = { 493 .ndo_init = macvlan_init, 494 .ndo_uninit = macvlan_uninit, 495 .ndo_open = macvlan_open, 496 .ndo_stop = macvlan_stop, 497 .ndo_start_xmit = macvlan_start_xmit, 498 .ndo_change_mtu = macvlan_change_mtu, 499 .ndo_change_rx_flags = macvlan_change_rx_flags, 500 .ndo_set_mac_address = macvlan_set_mac_address, 501 .ndo_set_multicast_list = macvlan_set_multicast_list, 502 .ndo_get_stats = macvlan_dev_get_stats, 503 .ndo_validate_addr = eth_validate_addr, 504 }; 505 506 static void macvlan_setup(struct net_device *dev) 507 { 508 ether_setup(dev); 509 510 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 511 dev->netdev_ops = &macvlan_netdev_ops; 512 dev->destructor = free_netdev; 513 dev->header_ops = &macvlan_hard_header_ops, 514 dev->ethtool_ops = &macvlan_ethtool_ops; 515 dev->tx_queue_len = 0; 516 } 517 518 static int macvlan_port_create(struct net_device *dev) 519 { 520 struct macvlan_port *port; 521 unsigned int i; 522 523 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 524 return -EINVAL; 525 526 port = kzalloc(sizeof(*port), GFP_KERNEL); 527 if (port == NULL) 528 return -ENOMEM; 529 530 port->dev = dev; 531 INIT_LIST_HEAD(&port->vlans); 532 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 533 INIT_HLIST_HEAD(&port->vlan_hash[i]); 534 rcu_assign_pointer(dev->macvlan_port, port); 535 return 0; 536 } 537 538 static void macvlan_port_destroy(struct net_device *dev) 539 { 540 struct macvlan_port *port = dev->macvlan_port; 541 542 rcu_assign_pointer(dev->macvlan_port, NULL); 543 synchronize_rcu(); 544 kfree(port); 545 } 546 547 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 548 { 549 if (tb[IFLA_ADDRESS]) { 550 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 551 return -EINVAL; 552 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 553 return -EADDRNOTAVAIL; 554 } 555 556 if (data && data[IFLA_MACVLAN_MODE]) { 557 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 558 case MACVLAN_MODE_PRIVATE: 559 case MACVLAN_MODE_VEPA: 560 case MACVLAN_MODE_BRIDGE: 561 break; 562 default: 563 return -EINVAL; 564 } 565 } 566 return 0; 567 } 568 569 static int macvlan_get_tx_queues(struct net *net, 570 struct nlattr *tb[], 571 unsigned int *num_tx_queues, 572 unsigned int *real_num_tx_queues) 573 { 574 struct net_device *real_dev; 575 576 if (!tb[IFLA_LINK]) 577 return -EINVAL; 578 579 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 580 if (!real_dev) 581 return -ENODEV; 582 583 *num_tx_queues = real_dev->num_tx_queues; 584 *real_num_tx_queues = real_dev->real_num_tx_queues; 585 return 0; 586 } 587 588 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 589 struct nlattr *tb[], struct nlattr *data[], 590 int (*receive)(struct sk_buff *skb), 591 int (*forward)(struct net_device *dev, 592 struct sk_buff *skb)) 593 { 594 struct macvlan_dev *vlan = netdev_priv(dev); 595 struct macvlan_port *port; 596 struct net_device *lowerdev; 597 int err; 598 599 if (!tb[IFLA_LINK]) 600 return -EINVAL; 601 602 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 603 if (lowerdev == NULL) 604 return -ENODEV; 605 606 /* When creating macvlans on top of other macvlans - use 607 * the real device as the lowerdev. 608 */ 609 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { 610 struct macvlan_dev *lowervlan = netdev_priv(lowerdev); 611 lowerdev = lowervlan->lowerdev; 612 } 613 614 if (!tb[IFLA_MTU]) 615 dev->mtu = lowerdev->mtu; 616 else if (dev->mtu > lowerdev->mtu) 617 return -EINVAL; 618 619 if (!tb[IFLA_ADDRESS]) 620 random_ether_addr(dev->dev_addr); 621 622 if (lowerdev->macvlan_port == NULL) { 623 err = macvlan_port_create(lowerdev); 624 if (err < 0) 625 return err; 626 } 627 port = lowerdev->macvlan_port; 628 629 vlan->lowerdev = lowerdev; 630 vlan->dev = dev; 631 vlan->port = port; 632 vlan->receive = receive; 633 vlan->forward = forward; 634 635 vlan->mode = MACVLAN_MODE_VEPA; 636 if (data && data[IFLA_MACVLAN_MODE]) 637 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 638 639 err = register_netdevice(dev); 640 if (err < 0) 641 return err; 642 643 list_add_tail(&vlan->list, &port->vlans); 644 netif_stacked_transfer_operstate(lowerdev, dev); 645 return 0; 646 } 647 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 648 649 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 650 struct nlattr *tb[], struct nlattr *data[]) 651 { 652 return macvlan_common_newlink(src_net, dev, tb, data, 653 netif_rx, 654 dev_forward_skb); 655 } 656 657 void macvlan_dellink(struct net_device *dev, struct list_head *head) 658 { 659 struct macvlan_dev *vlan = netdev_priv(dev); 660 struct macvlan_port *port = vlan->port; 661 662 list_del(&vlan->list); 663 unregister_netdevice_queue(dev, head); 664 665 if (list_empty(&port->vlans)) 666 macvlan_port_destroy(port->dev); 667 } 668 EXPORT_SYMBOL_GPL(macvlan_dellink); 669 670 static int macvlan_changelink(struct net_device *dev, 671 struct nlattr *tb[], struct nlattr *data[]) 672 { 673 struct macvlan_dev *vlan = netdev_priv(dev); 674 if (data && data[IFLA_MACVLAN_MODE]) 675 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 676 return 0; 677 } 678 679 static size_t macvlan_get_size(const struct net_device *dev) 680 { 681 return nla_total_size(4); 682 } 683 684 static int macvlan_fill_info(struct sk_buff *skb, 685 const struct net_device *dev) 686 { 687 struct macvlan_dev *vlan = netdev_priv(dev); 688 689 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode); 690 return 0; 691 692 nla_put_failure: 693 return -EMSGSIZE; 694 } 695 696 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 697 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 698 }; 699 700 int macvlan_link_register(struct rtnl_link_ops *ops) 701 { 702 /* common fields */ 703 ops->priv_size = sizeof(struct macvlan_dev); 704 ops->get_tx_queues = macvlan_get_tx_queues; 705 ops->setup = macvlan_setup; 706 ops->validate = macvlan_validate; 707 ops->maxtype = IFLA_MACVLAN_MAX; 708 ops->policy = macvlan_policy; 709 ops->changelink = macvlan_changelink; 710 ops->get_size = macvlan_get_size; 711 ops->fill_info = macvlan_fill_info; 712 713 return rtnl_link_register(ops); 714 }; 715 EXPORT_SYMBOL_GPL(macvlan_link_register); 716 717 static struct rtnl_link_ops macvlan_link_ops = { 718 .kind = "macvlan", 719 .newlink = macvlan_newlink, 720 .dellink = macvlan_dellink, 721 }; 722 723 static int macvlan_device_event(struct notifier_block *unused, 724 unsigned long event, void *ptr) 725 { 726 struct net_device *dev = ptr; 727 struct macvlan_dev *vlan, *next; 728 struct macvlan_port *port; 729 730 port = dev->macvlan_port; 731 if (port == NULL) 732 return NOTIFY_DONE; 733 734 switch (event) { 735 case NETDEV_CHANGE: 736 list_for_each_entry(vlan, &port->vlans, list) 737 netif_stacked_transfer_operstate(vlan->lowerdev, 738 vlan->dev); 739 break; 740 case NETDEV_FEAT_CHANGE: 741 list_for_each_entry(vlan, &port->vlans, list) { 742 vlan->dev->features = dev->features & MACVLAN_FEATURES; 743 vlan->dev->gso_max_size = dev->gso_max_size; 744 netdev_features_change(vlan->dev); 745 } 746 break; 747 case NETDEV_UNREGISTER: 748 list_for_each_entry_safe(vlan, next, &port->vlans, list) 749 vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL); 750 break; 751 } 752 return NOTIFY_DONE; 753 } 754 755 static struct notifier_block macvlan_notifier_block __read_mostly = { 756 .notifier_call = macvlan_device_event, 757 }; 758 759 static int __init macvlan_init_module(void) 760 { 761 int err; 762 763 register_netdevice_notifier(&macvlan_notifier_block); 764 macvlan_handle_frame_hook = macvlan_handle_frame; 765 766 err = macvlan_link_register(&macvlan_link_ops); 767 if (err < 0) 768 goto err1; 769 return 0; 770 err1: 771 macvlan_handle_frame_hook = NULL; 772 unregister_netdevice_notifier(&macvlan_notifier_block); 773 return err; 774 } 775 776 static void __exit macvlan_cleanup_module(void) 777 { 778 rtnl_link_unregister(&macvlan_link_ops); 779 macvlan_handle_frame_hook = NULL; 780 unregister_netdevice_notifier(&macvlan_notifier_block); 781 } 782 783 module_init(macvlan_init_module); 784 module_exit(macvlan_cleanup_module); 785 786 MODULE_LICENSE("GPL"); 787 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 788 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 789 MODULE_ALIAS_RTNL_LINK("macvlan"); 790