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 /** 43 * struct macvlan_rx_stats - MACVLAN percpu rx stats 44 * @rx_packets: number of received packets 45 * @rx_bytes: number of received bytes 46 * @multicast: number of received multicast packets 47 * @rx_errors: number of errors 48 */ 49 struct macvlan_rx_stats { 50 unsigned long rx_packets; 51 unsigned long rx_bytes; 52 unsigned long multicast; 53 unsigned long rx_errors; 54 }; 55 56 struct macvlan_dev { 57 struct net_device *dev; 58 struct list_head list; 59 struct hlist_node hlist; 60 struct macvlan_port *port; 61 struct net_device *lowerdev; 62 struct macvlan_rx_stats *rx_stats; 63 enum macvlan_mode mode; 64 }; 65 66 67 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 68 const unsigned char *addr) 69 { 70 struct macvlan_dev *vlan; 71 struct hlist_node *n; 72 73 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) { 74 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr)) 75 return vlan; 76 } 77 return NULL; 78 } 79 80 static void macvlan_hash_add(struct macvlan_dev *vlan) 81 { 82 struct macvlan_port *port = vlan->port; 83 const unsigned char *addr = vlan->dev->dev_addr; 84 85 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); 86 } 87 88 static void macvlan_hash_del(struct macvlan_dev *vlan) 89 { 90 hlist_del_rcu(&vlan->hlist); 91 synchronize_rcu(); 92 } 93 94 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 95 const unsigned char *addr) 96 { 97 macvlan_hash_del(vlan); 98 /* Now that we are unhashed it is safe to change the device 99 * address without confusing packet delivery. 100 */ 101 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 102 macvlan_hash_add(vlan); 103 } 104 105 static int macvlan_addr_busy(const struct macvlan_port *port, 106 const unsigned char *addr) 107 { 108 /* Test to see if the specified multicast address is 109 * currently in use by the underlying device or 110 * another macvlan. 111 */ 112 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr)) 113 return 1; 114 115 if (macvlan_hash_lookup(port, addr)) 116 return 1; 117 118 return 0; 119 } 120 121 static inline void macvlan_count_rx(const struct macvlan_dev *vlan, 122 unsigned int len, bool success, 123 bool multicast) 124 { 125 struct macvlan_rx_stats *rx_stats; 126 127 rx_stats = per_cpu_ptr(vlan->rx_stats, smp_processor_id()); 128 if (likely(success)) { 129 rx_stats->rx_packets++;; 130 rx_stats->rx_bytes += len; 131 if (multicast) 132 rx_stats->multicast++; 133 } else { 134 rx_stats->rx_errors++; 135 } 136 } 137 138 static int macvlan_broadcast_one(struct sk_buff *skb, struct net_device *dev, 139 const struct ethhdr *eth, bool local) 140 { 141 if (!skb) 142 return NET_RX_DROP; 143 144 if (local) 145 return dev_forward_skb(dev, skb); 146 147 skb->dev = dev; 148 if (!compare_ether_addr_64bits(eth->h_dest, 149 dev->broadcast)) 150 skb->pkt_type = PACKET_BROADCAST; 151 else 152 skb->pkt_type = PACKET_MULTICAST; 153 154 return netif_rx(skb); 155 } 156 157 static void macvlan_broadcast(struct sk_buff *skb, 158 const struct macvlan_port *port, 159 struct net_device *src, 160 enum macvlan_mode mode) 161 { 162 const struct ethhdr *eth = eth_hdr(skb); 163 const struct macvlan_dev *vlan; 164 struct hlist_node *n; 165 struct sk_buff *nskb; 166 unsigned int i; 167 int err; 168 169 if (skb->protocol == htons(ETH_P_PAUSE)) 170 return; 171 172 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 173 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) { 174 if (vlan->dev == src || !(vlan->mode & mode)) 175 continue; 176 177 nskb = skb_clone(skb, GFP_ATOMIC); 178 err = macvlan_broadcast_one(nskb, vlan->dev, eth, 179 mode == MACVLAN_MODE_BRIDGE); 180 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 181 err == NET_RX_SUCCESS, 1); 182 } 183 } 184 } 185 186 /* called under rcu_read_lock() from netif_receive_skb */ 187 static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb) 188 { 189 const struct ethhdr *eth = eth_hdr(skb); 190 const struct macvlan_port *port; 191 const struct macvlan_dev *vlan; 192 const struct macvlan_dev *src; 193 struct net_device *dev; 194 unsigned int len; 195 196 port = rcu_dereference(skb->dev->macvlan_port); 197 if (port == NULL) 198 return skb; 199 200 if (is_multicast_ether_addr(eth->h_dest)) { 201 src = macvlan_hash_lookup(port, eth->h_source); 202 if (!src) 203 /* frame comes from an external address */ 204 macvlan_broadcast(skb, port, NULL, 205 MACVLAN_MODE_PRIVATE | 206 MACVLAN_MODE_VEPA | 207 MACVLAN_MODE_BRIDGE); 208 else if (src->mode == MACVLAN_MODE_VEPA) 209 /* flood to everyone except source */ 210 macvlan_broadcast(skb, port, src->dev, 211 MACVLAN_MODE_VEPA | 212 MACVLAN_MODE_BRIDGE); 213 else if (src->mode == MACVLAN_MODE_BRIDGE) 214 /* 215 * flood only to VEPA ports, bridge ports 216 * already saw the frame on the way out. 217 */ 218 macvlan_broadcast(skb, port, src->dev, 219 MACVLAN_MODE_VEPA); 220 return skb; 221 } 222 223 vlan = macvlan_hash_lookup(port, eth->h_dest); 224 if (vlan == NULL) 225 return skb; 226 227 dev = vlan->dev; 228 if (unlikely(!(dev->flags & IFF_UP))) { 229 kfree_skb(skb); 230 return NULL; 231 } 232 len = skb->len + ETH_HLEN; 233 skb = skb_share_check(skb, GFP_ATOMIC); 234 macvlan_count_rx(vlan, len, skb != NULL, 0); 235 if (!skb) 236 return NULL; 237 238 skb->dev = dev; 239 skb->pkt_type = PACKET_HOST; 240 241 netif_rx(skb); 242 return NULL; 243 } 244 245 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 246 { 247 const struct macvlan_dev *vlan = netdev_priv(dev); 248 const struct macvlan_port *port = vlan->port; 249 const struct macvlan_dev *dest; 250 251 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 252 const struct ethhdr *eth = (void *)skb->data; 253 254 /* send to other bridge ports directly */ 255 if (is_multicast_ether_addr(eth->h_dest)) { 256 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 257 goto xmit_world; 258 } 259 260 dest = macvlan_hash_lookup(port, eth->h_dest); 261 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 262 unsigned int length = skb->len + ETH_HLEN; 263 int ret = dev_forward_skb(dest->dev, skb); 264 macvlan_count_rx(dest, length, 265 ret == NET_RX_SUCCESS, 0); 266 267 return NET_XMIT_SUCCESS; 268 } 269 } 270 271 xmit_world: 272 skb->dev = vlan->lowerdev; 273 return dev_queue_xmit(skb); 274 } 275 276 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 277 struct net_device *dev) 278 { 279 int i = skb_get_queue_mapping(skb); 280 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 281 unsigned int len = skb->len; 282 int ret; 283 284 ret = macvlan_queue_xmit(skb, dev); 285 if (likely(ret == NET_XMIT_SUCCESS)) { 286 txq->tx_packets++; 287 txq->tx_bytes += len; 288 } else 289 txq->tx_dropped++; 290 291 return ret; 292 } 293 294 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 295 unsigned short type, const void *daddr, 296 const void *saddr, unsigned len) 297 { 298 const struct macvlan_dev *vlan = netdev_priv(dev); 299 struct net_device *lowerdev = vlan->lowerdev; 300 301 return dev_hard_header(skb, lowerdev, type, daddr, 302 saddr ? : dev->dev_addr, len); 303 } 304 305 static const struct header_ops macvlan_hard_header_ops = { 306 .create = macvlan_hard_header, 307 .rebuild = eth_rebuild_header, 308 .parse = eth_header_parse, 309 .cache = eth_header_cache, 310 .cache_update = eth_header_cache_update, 311 }; 312 313 static int macvlan_open(struct net_device *dev) 314 { 315 struct macvlan_dev *vlan = netdev_priv(dev); 316 struct net_device *lowerdev = vlan->lowerdev; 317 int err; 318 319 err = -EBUSY; 320 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 321 goto out; 322 323 err = dev_unicast_add(lowerdev, dev->dev_addr); 324 if (err < 0) 325 goto out; 326 if (dev->flags & IFF_ALLMULTI) { 327 err = dev_set_allmulti(lowerdev, 1); 328 if (err < 0) 329 goto del_unicast; 330 } 331 macvlan_hash_add(vlan); 332 return 0; 333 334 del_unicast: 335 dev_unicast_delete(lowerdev, dev->dev_addr); 336 out: 337 return err; 338 } 339 340 static int macvlan_stop(struct net_device *dev) 341 { 342 struct macvlan_dev *vlan = netdev_priv(dev); 343 struct net_device *lowerdev = vlan->lowerdev; 344 345 dev_mc_unsync(lowerdev, dev); 346 if (dev->flags & IFF_ALLMULTI) 347 dev_set_allmulti(lowerdev, -1); 348 349 dev_unicast_delete(lowerdev, dev->dev_addr); 350 351 macvlan_hash_del(vlan); 352 return 0; 353 } 354 355 static int macvlan_set_mac_address(struct net_device *dev, void *p) 356 { 357 struct macvlan_dev *vlan = netdev_priv(dev); 358 struct net_device *lowerdev = vlan->lowerdev; 359 struct sockaddr *addr = p; 360 int err; 361 362 if (!is_valid_ether_addr(addr->sa_data)) 363 return -EADDRNOTAVAIL; 364 365 if (!(dev->flags & IFF_UP)) { 366 /* Just copy in the new address */ 367 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 368 } else { 369 /* Rehash and update the device filters */ 370 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 371 return -EBUSY; 372 373 err = dev_unicast_add(lowerdev, addr->sa_data); 374 if (err) 375 return err; 376 377 dev_unicast_delete(lowerdev, dev->dev_addr); 378 379 macvlan_hash_change_addr(vlan, addr->sa_data); 380 } 381 return 0; 382 } 383 384 static void macvlan_change_rx_flags(struct net_device *dev, int change) 385 { 386 struct macvlan_dev *vlan = netdev_priv(dev); 387 struct net_device *lowerdev = vlan->lowerdev; 388 389 if (change & IFF_ALLMULTI) 390 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 391 } 392 393 static void macvlan_set_multicast_list(struct net_device *dev) 394 { 395 struct macvlan_dev *vlan = netdev_priv(dev); 396 397 dev_mc_sync(vlan->lowerdev, dev); 398 } 399 400 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 401 { 402 struct macvlan_dev *vlan = netdev_priv(dev); 403 404 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 405 return -EINVAL; 406 dev->mtu = new_mtu; 407 return 0; 408 } 409 410 /* 411 * macvlan network devices have devices nesting below it and are a special 412 * "super class" of normal network devices; split their locks off into a 413 * separate class since they always nest. 414 */ 415 static struct lock_class_key macvlan_netdev_xmit_lock_key; 416 static struct lock_class_key macvlan_netdev_addr_lock_key; 417 418 #define MACVLAN_FEATURES \ 419 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 420 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 421 NETIF_F_TSO_ECN | NETIF_F_TSO6) 422 423 #define MACVLAN_STATE_MASK \ 424 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 425 426 static void macvlan_set_lockdep_class_one(struct net_device *dev, 427 struct netdev_queue *txq, 428 void *_unused) 429 { 430 lockdep_set_class(&txq->_xmit_lock, 431 &macvlan_netdev_xmit_lock_key); 432 } 433 434 static void macvlan_set_lockdep_class(struct net_device *dev) 435 { 436 lockdep_set_class(&dev->addr_list_lock, 437 &macvlan_netdev_addr_lock_key); 438 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 439 } 440 441 static int macvlan_init(struct net_device *dev) 442 { 443 struct macvlan_dev *vlan = netdev_priv(dev); 444 const struct net_device *lowerdev = vlan->lowerdev; 445 446 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 447 (lowerdev->state & MACVLAN_STATE_MASK); 448 dev->features = lowerdev->features & MACVLAN_FEATURES; 449 dev->gso_max_size = lowerdev->gso_max_size; 450 dev->iflink = lowerdev->ifindex; 451 dev->hard_header_len = lowerdev->hard_header_len; 452 453 macvlan_set_lockdep_class(dev); 454 455 vlan->rx_stats = alloc_percpu(struct macvlan_rx_stats); 456 if (!vlan->rx_stats) 457 return -ENOMEM; 458 459 return 0; 460 } 461 462 static void macvlan_uninit(struct net_device *dev) 463 { 464 struct macvlan_dev *vlan = netdev_priv(dev); 465 466 free_percpu(vlan->rx_stats); 467 } 468 469 static struct net_device_stats *macvlan_dev_get_stats(struct net_device *dev) 470 { 471 struct net_device_stats *stats = &dev->stats; 472 struct macvlan_dev *vlan = netdev_priv(dev); 473 474 dev_txq_stats_fold(dev, stats); 475 476 if (vlan->rx_stats) { 477 struct macvlan_rx_stats *p, rx = {0}; 478 int i; 479 480 for_each_possible_cpu(i) { 481 p = per_cpu_ptr(vlan->rx_stats, i); 482 rx.rx_packets += p->rx_packets; 483 rx.rx_bytes += p->rx_bytes; 484 rx.rx_errors += p->rx_errors; 485 rx.multicast += p->multicast; 486 } 487 stats->rx_packets = rx.rx_packets; 488 stats->rx_bytes = rx.rx_bytes; 489 stats->rx_errors = rx.rx_errors; 490 stats->rx_dropped = rx.rx_errors; 491 stats->multicast = rx.multicast; 492 } 493 return stats; 494 } 495 496 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 497 struct ethtool_drvinfo *drvinfo) 498 { 499 snprintf(drvinfo->driver, 32, "macvlan"); 500 snprintf(drvinfo->version, 32, "0.1"); 501 } 502 503 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev) 504 { 505 const struct macvlan_dev *vlan = netdev_priv(dev); 506 return dev_ethtool_get_rx_csum(vlan->lowerdev); 507 } 508 509 static int macvlan_ethtool_get_settings(struct net_device *dev, 510 struct ethtool_cmd *cmd) 511 { 512 const struct macvlan_dev *vlan = netdev_priv(dev); 513 return dev_ethtool_get_settings(vlan->lowerdev, cmd); 514 } 515 516 static u32 macvlan_ethtool_get_flags(struct net_device *dev) 517 { 518 const struct macvlan_dev *vlan = netdev_priv(dev); 519 return dev_ethtool_get_flags(vlan->lowerdev); 520 } 521 522 static const struct ethtool_ops macvlan_ethtool_ops = { 523 .get_link = ethtool_op_get_link, 524 .get_settings = macvlan_ethtool_get_settings, 525 .get_rx_csum = macvlan_ethtool_get_rx_csum, 526 .get_drvinfo = macvlan_ethtool_get_drvinfo, 527 .get_flags = macvlan_ethtool_get_flags, 528 }; 529 530 static const struct net_device_ops macvlan_netdev_ops = { 531 .ndo_init = macvlan_init, 532 .ndo_uninit = macvlan_uninit, 533 .ndo_open = macvlan_open, 534 .ndo_stop = macvlan_stop, 535 .ndo_start_xmit = macvlan_start_xmit, 536 .ndo_change_mtu = macvlan_change_mtu, 537 .ndo_change_rx_flags = macvlan_change_rx_flags, 538 .ndo_set_mac_address = macvlan_set_mac_address, 539 .ndo_set_multicast_list = macvlan_set_multicast_list, 540 .ndo_get_stats = macvlan_dev_get_stats, 541 .ndo_validate_addr = eth_validate_addr, 542 }; 543 544 static void macvlan_setup(struct net_device *dev) 545 { 546 ether_setup(dev); 547 548 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 549 dev->netdev_ops = &macvlan_netdev_ops; 550 dev->destructor = free_netdev; 551 dev->header_ops = &macvlan_hard_header_ops, 552 dev->ethtool_ops = &macvlan_ethtool_ops; 553 dev->tx_queue_len = 0; 554 } 555 556 static int macvlan_port_create(struct net_device *dev) 557 { 558 struct macvlan_port *port; 559 unsigned int i; 560 561 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 562 return -EINVAL; 563 564 port = kzalloc(sizeof(*port), GFP_KERNEL); 565 if (port == NULL) 566 return -ENOMEM; 567 568 port->dev = dev; 569 INIT_LIST_HEAD(&port->vlans); 570 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 571 INIT_HLIST_HEAD(&port->vlan_hash[i]); 572 rcu_assign_pointer(dev->macvlan_port, port); 573 return 0; 574 } 575 576 static void macvlan_port_destroy(struct net_device *dev) 577 { 578 struct macvlan_port *port = dev->macvlan_port; 579 580 rcu_assign_pointer(dev->macvlan_port, NULL); 581 synchronize_rcu(); 582 kfree(port); 583 } 584 585 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 586 { 587 if (tb[IFLA_ADDRESS]) { 588 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 589 return -EINVAL; 590 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 591 return -EADDRNOTAVAIL; 592 } 593 594 if (data && data[IFLA_MACVLAN_MODE]) { 595 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 596 case MACVLAN_MODE_PRIVATE: 597 case MACVLAN_MODE_VEPA: 598 case MACVLAN_MODE_BRIDGE: 599 break; 600 default: 601 return -EINVAL; 602 } 603 } 604 return 0; 605 } 606 607 static int macvlan_get_tx_queues(struct net *net, 608 struct nlattr *tb[], 609 unsigned int *num_tx_queues, 610 unsigned int *real_num_tx_queues) 611 { 612 struct net_device *real_dev; 613 614 if (!tb[IFLA_LINK]) 615 return -EINVAL; 616 617 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 618 if (!real_dev) 619 return -ENODEV; 620 621 *num_tx_queues = real_dev->num_tx_queues; 622 *real_num_tx_queues = real_dev->real_num_tx_queues; 623 return 0; 624 } 625 626 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 627 struct nlattr *tb[], struct nlattr *data[]) 628 { 629 struct macvlan_dev *vlan = netdev_priv(dev); 630 struct macvlan_port *port; 631 struct net_device *lowerdev; 632 int err; 633 634 if (!tb[IFLA_LINK]) 635 return -EINVAL; 636 637 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 638 if (lowerdev == NULL) 639 return -ENODEV; 640 641 /* When creating macvlans on top of other macvlans - use 642 * the real device as the lowerdev. 643 */ 644 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { 645 struct macvlan_dev *lowervlan = netdev_priv(lowerdev); 646 lowerdev = lowervlan->lowerdev; 647 } 648 649 if (!tb[IFLA_MTU]) 650 dev->mtu = lowerdev->mtu; 651 else if (dev->mtu > lowerdev->mtu) 652 return -EINVAL; 653 654 if (!tb[IFLA_ADDRESS]) 655 random_ether_addr(dev->dev_addr); 656 657 if (lowerdev->macvlan_port == NULL) { 658 err = macvlan_port_create(lowerdev); 659 if (err < 0) 660 return err; 661 } 662 port = lowerdev->macvlan_port; 663 664 vlan->lowerdev = lowerdev; 665 vlan->dev = dev; 666 vlan->port = port; 667 668 vlan->mode = MACVLAN_MODE_VEPA; 669 if (data && data[IFLA_MACVLAN_MODE]) 670 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 671 672 err = register_netdevice(dev); 673 if (err < 0) 674 return err; 675 676 list_add_tail(&vlan->list, &port->vlans); 677 netif_stacked_transfer_operstate(lowerdev, dev); 678 return 0; 679 } 680 681 static void macvlan_dellink(struct net_device *dev, struct list_head *head) 682 { 683 struct macvlan_dev *vlan = netdev_priv(dev); 684 struct macvlan_port *port = vlan->port; 685 686 list_del(&vlan->list); 687 unregister_netdevice_queue(dev, head); 688 689 if (list_empty(&port->vlans)) 690 macvlan_port_destroy(port->dev); 691 } 692 693 static int macvlan_changelink(struct net_device *dev, 694 struct nlattr *tb[], struct nlattr *data[]) 695 { 696 struct macvlan_dev *vlan = netdev_priv(dev); 697 if (data && data[IFLA_MACVLAN_MODE]) 698 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 699 return 0; 700 } 701 702 static size_t macvlan_get_size(const struct net_device *dev) 703 { 704 return nla_total_size(4); 705 } 706 707 static int macvlan_fill_info(struct sk_buff *skb, 708 const struct net_device *dev) 709 { 710 struct macvlan_dev *vlan = netdev_priv(dev); 711 712 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode); 713 return 0; 714 715 nla_put_failure: 716 return -EMSGSIZE; 717 } 718 719 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 720 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 721 }; 722 723 static struct rtnl_link_ops macvlan_link_ops __read_mostly = { 724 .kind = "macvlan", 725 .priv_size = sizeof(struct macvlan_dev), 726 .get_tx_queues = macvlan_get_tx_queues, 727 .setup = macvlan_setup, 728 .validate = macvlan_validate, 729 .newlink = macvlan_newlink, 730 .dellink = macvlan_dellink, 731 .maxtype = IFLA_MACVLAN_MAX, 732 .policy = macvlan_policy, 733 .changelink = macvlan_changelink, 734 .get_size = macvlan_get_size, 735 .fill_info = macvlan_fill_info, 736 }; 737 738 static int macvlan_device_event(struct notifier_block *unused, 739 unsigned long event, void *ptr) 740 { 741 struct net_device *dev = ptr; 742 struct macvlan_dev *vlan, *next; 743 struct macvlan_port *port; 744 745 port = dev->macvlan_port; 746 if (port == NULL) 747 return NOTIFY_DONE; 748 749 switch (event) { 750 case NETDEV_CHANGE: 751 list_for_each_entry(vlan, &port->vlans, list) 752 netif_stacked_transfer_operstate(vlan->lowerdev, 753 vlan->dev); 754 break; 755 case NETDEV_FEAT_CHANGE: 756 list_for_each_entry(vlan, &port->vlans, list) { 757 vlan->dev->features = dev->features & MACVLAN_FEATURES; 758 vlan->dev->gso_max_size = dev->gso_max_size; 759 netdev_features_change(vlan->dev); 760 } 761 break; 762 case NETDEV_UNREGISTER: 763 list_for_each_entry_safe(vlan, next, &port->vlans, list) 764 macvlan_dellink(vlan->dev, NULL); 765 break; 766 } 767 return NOTIFY_DONE; 768 } 769 770 static struct notifier_block macvlan_notifier_block __read_mostly = { 771 .notifier_call = macvlan_device_event, 772 }; 773 774 static int __init macvlan_init_module(void) 775 { 776 int err; 777 778 register_netdevice_notifier(&macvlan_notifier_block); 779 macvlan_handle_frame_hook = macvlan_handle_frame; 780 781 err = rtnl_link_register(&macvlan_link_ops); 782 if (err < 0) 783 goto err1; 784 return 0; 785 err1: 786 macvlan_handle_frame_hook = NULL; 787 unregister_netdevice_notifier(&macvlan_notifier_block); 788 return err; 789 } 790 791 static void __exit macvlan_cleanup_module(void) 792 { 793 rtnl_link_unregister(&macvlan_link_ops); 794 macvlan_handle_frame_hook = NULL; 795 unregister_netdevice_notifier(&macvlan_notifier_block); 796 } 797 798 module_init(macvlan_init_module); 799 module_exit(macvlan_cleanup_module); 800 801 MODULE_LICENSE("GPL"); 802 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 803 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 804 MODULE_ALIAS_RTNL_LINK("macvlan"); 805