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 36struct macvlan_port { 37 struct net_device *dev; 38 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 39 struct list_head vlans; 40 struct rcu_head rcu; 41}; 42 43#define macvlan_port_get_rcu(dev) \ 44 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data)) 45#define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data) 46#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 47 48static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 49 const unsigned char *addr) 50{ 51 struct macvlan_dev *vlan; 52 struct hlist_node *n; 53 54 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) { 55 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr)) 56 return vlan; 57 } 58 return NULL; 59} 60 61static void macvlan_hash_add(struct macvlan_dev *vlan) 62{ 63 struct macvlan_port *port = vlan->port; 64 const unsigned char *addr = vlan->dev->dev_addr; 65 66 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); 67} 68 69static void macvlan_hash_del(struct macvlan_dev *vlan) 70{ 71 hlist_del_rcu(&vlan->hlist); 72 synchronize_rcu(); 73} 74 75static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 76 const unsigned char *addr) 77{ 78 macvlan_hash_del(vlan); 79 /* Now that we are unhashed it is safe to change the device 80 * address without confusing packet delivery. 81 */ 82 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 83 macvlan_hash_add(vlan); 84} 85 86static int macvlan_addr_busy(const struct macvlan_port *port, 87 const unsigned char *addr) 88{ 89 /* Test to see if the specified multicast address is 90 * currently in use by the underlying device or 91 * another macvlan. 92 */ 93 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr)) 94 return 1; 95 96 if (macvlan_hash_lookup(port, addr)) 97 return 1; 98 99 return 0; 100} 101 102 103static int macvlan_broadcast_one(struct sk_buff *skb, 104 const struct macvlan_dev *vlan, 105 const struct ethhdr *eth, bool local) 106{ 107 struct net_device *dev = vlan->dev; 108 if (!skb) 109 return NET_RX_DROP; 110 111 if (local) 112 return vlan->forward(dev, skb); 113 114 skb->dev = dev; 115 if (!compare_ether_addr_64bits(eth->h_dest, 116 dev->broadcast)) 117 skb->pkt_type = PACKET_BROADCAST; 118 else 119 skb->pkt_type = PACKET_MULTICAST; 120 121 return vlan->receive(skb); 122} 123 124static void macvlan_broadcast(struct sk_buff *skb, 125 const struct macvlan_port *port, 126 struct net_device *src, 127 enum macvlan_mode mode) 128{ 129 const struct ethhdr *eth = eth_hdr(skb); 130 const struct macvlan_dev *vlan; 131 struct hlist_node *n; 132 struct sk_buff *nskb; 133 unsigned int i; 134 int err; 135 136 if (skb->protocol == htons(ETH_P_PAUSE)) 137 return; 138 139 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 140 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) { 141 if (vlan->dev == src || !(vlan->mode & mode)) 142 continue; 143 144 nskb = skb_clone(skb, GFP_ATOMIC); 145 err = macvlan_broadcast_one(nskb, vlan, eth, 146 mode == MACVLAN_MODE_BRIDGE); 147 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 148 err == NET_RX_SUCCESS, 1); 149 } 150 } 151} 152 153/* called under rcu_read_lock() from netif_receive_skb */ 154static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb) 155{ 156 struct macvlan_port *port; 157 const struct ethhdr *eth = eth_hdr(skb); 158 const struct macvlan_dev *vlan; 159 const struct macvlan_dev *src; 160 struct net_device *dev; 161 unsigned int len = 0; 162 int ret = NET_RX_DROP; 163 164 port = macvlan_port_get_rcu(skb->dev); 165 if (is_multicast_ether_addr(eth->h_dest)) { 166 src = macvlan_hash_lookup(port, eth->h_source); 167 if (!src) 168 /* frame comes from an external address */ 169 macvlan_broadcast(skb, port, NULL, 170 MACVLAN_MODE_PRIVATE | 171 MACVLAN_MODE_VEPA | 172 MACVLAN_MODE_BRIDGE); 173 else if (src->mode == MACVLAN_MODE_VEPA) 174 /* flood to everyone except source */ 175 macvlan_broadcast(skb, port, src->dev, 176 MACVLAN_MODE_VEPA | 177 MACVLAN_MODE_BRIDGE); 178 else if (src->mode == MACVLAN_MODE_BRIDGE) 179 /* 180 * flood only to VEPA ports, bridge ports 181 * already saw the frame on the way out. 182 */ 183 macvlan_broadcast(skb, port, src->dev, 184 MACVLAN_MODE_VEPA); 185 return skb; 186 } 187 188 vlan = macvlan_hash_lookup(port, eth->h_dest); 189 if (vlan == NULL) 190 return skb; 191 192 dev = vlan->dev; 193 if (unlikely(!(dev->flags & IFF_UP))) { 194 kfree_skb(skb); 195 return NULL; 196 } 197 len = skb->len + ETH_HLEN; 198 skb = skb_share_check(skb, GFP_ATOMIC); 199 if (!skb) 200 goto out; 201 202 skb->dev = dev; 203 skb->pkt_type = PACKET_HOST; 204 205 ret = vlan->receive(skb); 206 207out: 208 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); 209 return NULL; 210} 211 212static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 213{ 214 const struct macvlan_dev *vlan = netdev_priv(dev); 215 const struct macvlan_port *port = vlan->port; 216 const struct macvlan_dev *dest; 217 218 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 219 const struct ethhdr *eth = (void *)skb->data; 220 221 /* send to other bridge ports directly */ 222 if (is_multicast_ether_addr(eth->h_dest)) { 223 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 224 goto xmit_world; 225 } 226 227 dest = macvlan_hash_lookup(port, eth->h_dest); 228 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 229 unsigned int length = skb->len + ETH_HLEN; 230 int ret = dest->forward(dest->dev, skb); 231 macvlan_count_rx(dest, length, 232 ret == NET_RX_SUCCESS, 0); 233 234 return NET_XMIT_SUCCESS; 235 } 236 } 237 238xmit_world: 239 skb_set_dev(skb, vlan->lowerdev); 240 return dev_queue_xmit(skb); 241} 242 243netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 244 struct net_device *dev) 245{ 246 int i = skb_get_queue_mapping(skb); 247 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 248 unsigned int len = skb->len; 249 int ret; 250 251 ret = macvlan_queue_xmit(skb, dev); 252 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 253 txq->tx_packets++; 254 txq->tx_bytes += len; 255 } else 256 txq->tx_dropped++; 257 258 return ret; 259} 260EXPORT_SYMBOL_GPL(macvlan_start_xmit); 261 262static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 263 unsigned short type, const void *daddr, 264 const void *saddr, unsigned len) 265{ 266 const struct macvlan_dev *vlan = netdev_priv(dev); 267 struct net_device *lowerdev = vlan->lowerdev; 268 269 return dev_hard_header(skb, lowerdev, type, daddr, 270 saddr ? : dev->dev_addr, len); 271} 272 273static const struct header_ops macvlan_hard_header_ops = { 274 .create = macvlan_hard_header, 275 .rebuild = eth_rebuild_header, 276 .parse = eth_header_parse, 277 .cache = eth_header_cache, 278 .cache_update = eth_header_cache_update, 279}; 280 281static int macvlan_open(struct net_device *dev) 282{ 283 struct macvlan_dev *vlan = netdev_priv(dev); 284 struct net_device *lowerdev = vlan->lowerdev; 285 int err; 286 287 err = -EBUSY; 288 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 289 goto out; 290 291 err = dev_uc_add(lowerdev, dev->dev_addr); 292 if (err < 0) 293 goto out; 294 if (dev->flags & IFF_ALLMULTI) { 295 err = dev_set_allmulti(lowerdev, 1); 296 if (err < 0) 297 goto del_unicast; 298 } 299 macvlan_hash_add(vlan); 300 return 0; 301 302del_unicast: 303 dev_uc_del(lowerdev, dev->dev_addr); 304out: 305 return err; 306} 307 308static int macvlan_stop(struct net_device *dev) 309{ 310 struct macvlan_dev *vlan = netdev_priv(dev); 311 struct net_device *lowerdev = vlan->lowerdev; 312 313 dev_mc_unsync(lowerdev, dev); 314 if (dev->flags & IFF_ALLMULTI) 315 dev_set_allmulti(lowerdev, -1); 316 317 dev_uc_del(lowerdev, dev->dev_addr); 318 319 macvlan_hash_del(vlan); 320 return 0; 321} 322 323static int macvlan_set_mac_address(struct net_device *dev, void *p) 324{ 325 struct macvlan_dev *vlan = netdev_priv(dev); 326 struct net_device *lowerdev = vlan->lowerdev; 327 struct sockaddr *addr = p; 328 int err; 329 330 if (!is_valid_ether_addr(addr->sa_data)) 331 return -EADDRNOTAVAIL; 332 333 if (!(dev->flags & IFF_UP)) { 334 /* Just copy in the new address */ 335 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 336 } else { 337 /* Rehash and update the device filters */ 338 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 339 return -EBUSY; 340 341 err = dev_uc_add(lowerdev, addr->sa_data); 342 if (err) 343 return err; 344 345 dev_uc_del(lowerdev, dev->dev_addr); 346 347 macvlan_hash_change_addr(vlan, addr->sa_data); 348 } 349 return 0; 350} 351 352static void macvlan_change_rx_flags(struct net_device *dev, int change) 353{ 354 struct macvlan_dev *vlan = netdev_priv(dev); 355 struct net_device *lowerdev = vlan->lowerdev; 356 357 if (change & IFF_ALLMULTI) 358 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 359} 360 361static void macvlan_set_multicast_list(struct net_device *dev) 362{ 363 struct macvlan_dev *vlan = netdev_priv(dev); 364 365 dev_mc_sync(vlan->lowerdev, dev); 366} 367 368static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 369{ 370 struct macvlan_dev *vlan = netdev_priv(dev); 371 372 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 373 return -EINVAL; 374 dev->mtu = new_mtu; 375 return 0; 376} 377 378/* 379 * macvlan network devices have devices nesting below it and are a special 380 * "super class" of normal network devices; split their locks off into a 381 * separate class since they always nest. 382 */ 383static struct lock_class_key macvlan_netdev_xmit_lock_key; 384static struct lock_class_key macvlan_netdev_addr_lock_key; 385 386#define MACVLAN_FEATURES \ 387 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 388 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 389 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO) 390 391#define MACVLAN_STATE_MASK \ 392 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 393 394static void macvlan_set_lockdep_class_one(struct net_device *dev, 395 struct netdev_queue *txq, 396 void *_unused) 397{ 398 lockdep_set_class(&txq->_xmit_lock, 399 &macvlan_netdev_xmit_lock_key); 400} 401 402static void macvlan_set_lockdep_class(struct net_device *dev) 403{ 404 lockdep_set_class(&dev->addr_list_lock, 405 &macvlan_netdev_addr_lock_key); 406 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 407} 408 409static int macvlan_init(struct net_device *dev) 410{ 411 struct macvlan_dev *vlan = netdev_priv(dev); 412 const struct net_device *lowerdev = vlan->lowerdev; 413 414 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 415 (lowerdev->state & MACVLAN_STATE_MASK); 416 dev->features = lowerdev->features & MACVLAN_FEATURES; 417 dev->gso_max_size = lowerdev->gso_max_size; 418 dev->iflink = lowerdev->ifindex; 419 dev->hard_header_len = lowerdev->hard_header_len; 420 421 macvlan_set_lockdep_class(dev); 422 423 vlan->rx_stats = alloc_percpu(struct macvlan_rx_stats); 424 if (!vlan->rx_stats) 425 return -ENOMEM; 426 427 return 0; 428} 429 430static void macvlan_uninit(struct net_device *dev) 431{ 432 struct macvlan_dev *vlan = netdev_priv(dev); 433 434 free_percpu(vlan->rx_stats); 435} 436 437static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 438 struct rtnl_link_stats64 *stats) 439{ 440 struct macvlan_dev *vlan = netdev_priv(dev); 441 442 dev_txq_stats_fold(dev, stats); 443 444 if (vlan->rx_stats) { 445 struct macvlan_rx_stats *p, accum = {0}; 446 u64 rx_packets, rx_bytes, rx_multicast; 447 unsigned int start; 448 int i; 449 450 for_each_possible_cpu(i) { 451 p = per_cpu_ptr(vlan->rx_stats, i); 452 do { 453 start = u64_stats_fetch_begin_bh(&p->syncp); 454 rx_packets = p->rx_packets; 455 rx_bytes = p->rx_bytes; 456 rx_multicast = p->rx_multicast; 457 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 458 accum.rx_packets += rx_packets; 459 accum.rx_bytes += rx_bytes; 460 accum.rx_multicast += rx_multicast; 461 /* rx_errors is an ulong, updated without syncp protection */ 462 accum.rx_errors += p->rx_errors; 463 } 464 stats->rx_packets = accum.rx_packets; 465 stats->rx_bytes = accum.rx_bytes; 466 stats->rx_errors = accum.rx_errors; 467 stats->rx_dropped = accum.rx_errors; 468 stats->multicast = accum.rx_multicast; 469 } 470 return stats; 471} 472 473static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 474 struct ethtool_drvinfo *drvinfo) 475{ 476 snprintf(drvinfo->driver, 32, "macvlan"); 477 snprintf(drvinfo->version, 32, "0.1"); 478} 479 480static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev) 481{ 482 const struct macvlan_dev *vlan = netdev_priv(dev); 483 return dev_ethtool_get_rx_csum(vlan->lowerdev); 484} 485 486static int macvlan_ethtool_get_settings(struct net_device *dev, 487 struct ethtool_cmd *cmd) 488{ 489 const struct macvlan_dev *vlan = netdev_priv(dev); 490 return dev_ethtool_get_settings(vlan->lowerdev, cmd); 491} 492 493static u32 macvlan_ethtool_get_flags(struct net_device *dev) 494{ 495 const struct macvlan_dev *vlan = netdev_priv(dev); 496 return dev_ethtool_get_flags(vlan->lowerdev); 497} 498 499static const struct ethtool_ops macvlan_ethtool_ops = { 500 .get_link = ethtool_op_get_link, 501 .get_settings = macvlan_ethtool_get_settings, 502 .get_rx_csum = macvlan_ethtool_get_rx_csum, 503 .get_drvinfo = macvlan_ethtool_get_drvinfo, 504 .get_flags = macvlan_ethtool_get_flags, 505}; 506 507static const struct net_device_ops macvlan_netdev_ops = { 508 .ndo_init = macvlan_init, 509 .ndo_uninit = macvlan_uninit, 510 .ndo_open = macvlan_open, 511 .ndo_stop = macvlan_stop, 512 .ndo_start_xmit = macvlan_start_xmit, 513 .ndo_change_mtu = macvlan_change_mtu, 514 .ndo_change_rx_flags = macvlan_change_rx_flags, 515 .ndo_set_mac_address = macvlan_set_mac_address, 516 .ndo_set_multicast_list = macvlan_set_multicast_list, 517 .ndo_get_stats64 = macvlan_dev_get_stats64, 518 .ndo_validate_addr = eth_validate_addr, 519}; 520 521void macvlan_common_setup(struct net_device *dev) 522{ 523 ether_setup(dev); 524 525 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 526 dev->netdev_ops = &macvlan_netdev_ops; 527 dev->destructor = free_netdev; 528 dev->header_ops = &macvlan_hard_header_ops, 529 dev->ethtool_ops = &macvlan_ethtool_ops; 530} 531EXPORT_SYMBOL_GPL(macvlan_common_setup); 532 533static void macvlan_setup(struct net_device *dev) 534{ 535 macvlan_common_setup(dev); 536 dev->tx_queue_len = 0; 537} 538 539static int macvlan_port_create(struct net_device *dev) 540{ 541 struct macvlan_port *port; 542 unsigned int i; 543 int err; 544 545 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 546 return -EINVAL; 547 548 port = kzalloc(sizeof(*port), GFP_KERNEL); 549 if (port == NULL) 550 return -ENOMEM; 551 552 port->dev = dev; 553 INIT_LIST_HEAD(&port->vlans); 554 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 555 INIT_HLIST_HEAD(&port->vlan_hash[i]); 556 557 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 558 if (err) 559 kfree(port); 560 561 dev->priv_flags |= IFF_MACVLAN_PORT; 562 return err; 563} 564 565static void macvlan_port_rcu_free(struct rcu_head *head) 566{ 567 struct macvlan_port *port; 568 569 port = container_of(head, struct macvlan_port, rcu); 570 kfree(port); 571} 572 573static void macvlan_port_destroy(struct net_device *dev) 574{ 575 struct macvlan_port *port = macvlan_port_get(dev); 576 577 dev->priv_flags &= ~IFF_MACVLAN_PORT; 578 netdev_rx_handler_unregister(dev); 579 call_rcu(&port->rcu, macvlan_port_rcu_free); 580} 581 582static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 583{ 584 if (tb[IFLA_ADDRESS]) { 585 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 586 return -EINVAL; 587 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 588 return -EADDRNOTAVAIL; 589 } 590 591 if (data && data[IFLA_MACVLAN_MODE]) { 592 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 593 case MACVLAN_MODE_PRIVATE: 594 case MACVLAN_MODE_VEPA: 595 case MACVLAN_MODE_BRIDGE: 596 break; 597 default: 598 return -EINVAL; 599 } 600 } 601 return 0; 602} 603 604static int macvlan_get_tx_queues(struct net *net, 605 struct nlattr *tb[], 606 unsigned int *num_tx_queues, 607 unsigned int *real_num_tx_queues) 608{ 609 struct net_device *real_dev; 610 611 if (!tb[IFLA_LINK]) 612 return -EINVAL; 613 614 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 615 if (!real_dev) 616 return -ENODEV; 617 618 *num_tx_queues = real_dev->num_tx_queues; 619 *real_num_tx_queues = real_dev->real_num_tx_queues; 620 return 0; 621} 622 623int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 624 struct nlattr *tb[], struct nlattr *data[], 625 int (*receive)(struct sk_buff *skb), 626 int (*forward)(struct net_device *dev, 627 struct sk_buff *skb)) 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 (!macvlan_port_exists(lowerdev)) { 658 err = macvlan_port_create(lowerdev); 659 if (err < 0) 660 return err; 661 } 662 port = macvlan_port_get(lowerdev); 663 664 vlan->lowerdev = lowerdev; 665 vlan->dev = dev; 666 vlan->port = port; 667 vlan->receive = receive; 668 vlan->forward = forward; 669 670 vlan->mode = MACVLAN_MODE_VEPA; 671 if (data && data[IFLA_MACVLAN_MODE]) 672 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 673 674 err = register_netdevice(dev); 675 if (err < 0) 676 goto destroy_port; 677 678 list_add_tail(&vlan->list, &port->vlans); 679 netif_stacked_transfer_operstate(lowerdev, dev); 680 681 return 0; 682 683destroy_port: 684 if (list_empty(&port->vlans)) 685 macvlan_port_destroy(lowerdev); 686 687 return err; 688} 689EXPORT_SYMBOL_GPL(macvlan_common_newlink); 690 691static int macvlan_newlink(struct net *src_net, struct net_device *dev, 692 struct nlattr *tb[], struct nlattr *data[]) 693{ 694 return macvlan_common_newlink(src_net, dev, tb, data, 695 netif_rx, 696 dev_forward_skb); 697} 698 699void macvlan_dellink(struct net_device *dev, struct list_head *head) 700{ 701 struct macvlan_dev *vlan = netdev_priv(dev); 702 struct macvlan_port *port = vlan->port; 703 704 list_del(&vlan->list); 705 unregister_netdevice_queue(dev, head); 706 707 if (list_empty(&port->vlans)) 708 macvlan_port_destroy(port->dev); 709} 710EXPORT_SYMBOL_GPL(macvlan_dellink); 711 712static int macvlan_changelink(struct net_device *dev, 713 struct nlattr *tb[], struct nlattr *data[]) 714{ 715 struct macvlan_dev *vlan = netdev_priv(dev); 716 if (data && data[IFLA_MACVLAN_MODE]) 717 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 718 return 0; 719} 720 721static size_t macvlan_get_size(const struct net_device *dev) 722{ 723 return nla_total_size(4); 724} 725 726static int macvlan_fill_info(struct sk_buff *skb, 727 const struct net_device *dev) 728{ 729 struct macvlan_dev *vlan = netdev_priv(dev); 730 731 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode); 732 return 0; 733 734nla_put_failure: 735 return -EMSGSIZE; 736} 737 738static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 739 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 740}; 741 742int macvlan_link_register(struct rtnl_link_ops *ops) 743{ 744 /* common fields */ 745 ops->priv_size = sizeof(struct macvlan_dev); 746 ops->get_tx_queues = macvlan_get_tx_queues; 747 ops->validate = macvlan_validate; 748 ops->maxtype = IFLA_MACVLAN_MAX; 749 ops->policy = macvlan_policy; 750 ops->changelink = macvlan_changelink; 751 ops->get_size = macvlan_get_size; 752 ops->fill_info = macvlan_fill_info; 753 754 return rtnl_link_register(ops); 755}; 756EXPORT_SYMBOL_GPL(macvlan_link_register); 757 758static struct rtnl_link_ops macvlan_link_ops = { 759 .kind = "macvlan", 760 .setup = macvlan_setup, 761 .newlink = macvlan_newlink, 762 .dellink = macvlan_dellink, 763}; 764 765static int macvlan_device_event(struct notifier_block *unused, 766 unsigned long event, void *ptr) 767{ 768 struct net_device *dev = ptr; 769 struct macvlan_dev *vlan, *next; 770 struct macvlan_port *port; 771 772 if (!macvlan_port_exists(dev)) 773 return NOTIFY_DONE; 774 775 port = macvlan_port_get(dev); 776 777 switch (event) { 778 case NETDEV_CHANGE: 779 list_for_each_entry(vlan, &port->vlans, list) 780 netif_stacked_transfer_operstate(vlan->lowerdev, 781 vlan->dev); 782 break; 783 case NETDEV_FEAT_CHANGE: 784 list_for_each_entry(vlan, &port->vlans, list) { 785 vlan->dev->features = dev->features & MACVLAN_FEATURES; 786 vlan->dev->gso_max_size = dev->gso_max_size; 787 netdev_features_change(vlan->dev); 788 } 789 break; 790 case NETDEV_UNREGISTER: 791 list_for_each_entry_safe(vlan, next, &port->vlans, list) 792 vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL); 793 break; 794 case NETDEV_PRE_TYPE_CHANGE: 795 /* Forbid underlaying device to change its type. */ 796 return NOTIFY_BAD; 797 } 798 return NOTIFY_DONE; 799} 800 801static struct notifier_block macvlan_notifier_block __read_mostly = { 802 .notifier_call = macvlan_device_event, 803}; 804 805static int __init macvlan_init_module(void) 806{ 807 int err; 808 809 register_netdevice_notifier(&macvlan_notifier_block); 810 811 err = macvlan_link_register(&macvlan_link_ops); 812 if (err < 0) 813 goto err1; 814 return 0; 815err1: 816 unregister_netdevice_notifier(&macvlan_notifier_block); 817 return err; 818} 819 820static void __exit macvlan_cleanup_module(void) 821{ 822 rtnl_link_unregister(&macvlan_link_ops); 823 unregister_netdevice_notifier(&macvlan_notifier_block); 824} 825 826module_init(macvlan_init_module); 827module_exit(macvlan_cleanup_module); 828 829MODULE_LICENSE("GPL"); 830MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 831MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 832MODULE_ALIAS_RTNL_LINK("macvlan"); 833