macvlan.c revision 87002b03baabd2b8f6281ab6411ed88d24958de1
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_vlan.h> 30#include <linux/if_link.h> 31#include <linux/if_macvlan.h> 32#include <net/rtnetlink.h> 33#include <net/xfrm.h> 34 35#define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE) 36 37struct macvlan_port { 38 struct net_device *dev; 39 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 40 struct list_head vlans; 41 struct rcu_head rcu; 42 bool passthru; 43 int count; 44}; 45 46static void macvlan_port_destroy(struct net_device *dev); 47 48#define macvlan_port_get_rcu(dev) \ 49 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data)) 50#define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data) 51#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 52 53static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 54 const unsigned char *addr) 55{ 56 struct macvlan_dev *vlan; 57 struct hlist_node *n; 58 59 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) { 60 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr)) 61 return vlan; 62 } 63 return NULL; 64} 65 66static void macvlan_hash_add(struct macvlan_dev *vlan) 67{ 68 struct macvlan_port *port = vlan->port; 69 const unsigned char *addr = vlan->dev->dev_addr; 70 71 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); 72} 73 74static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 75{ 76 hlist_del_rcu(&vlan->hlist); 77 if (sync) 78 synchronize_rcu(); 79} 80 81static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 82 const unsigned char *addr) 83{ 84 macvlan_hash_del(vlan, true); 85 /* Now that we are unhashed it is safe to change the device 86 * address without confusing packet delivery. 87 */ 88 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 89 macvlan_hash_add(vlan); 90} 91 92static int macvlan_addr_busy(const struct macvlan_port *port, 93 const unsigned char *addr) 94{ 95 /* Test to see if the specified multicast address is 96 * currently in use by the underlying device or 97 * another macvlan. 98 */ 99 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr)) 100 return 1; 101 102 if (macvlan_hash_lookup(port, addr)) 103 return 1; 104 105 return 0; 106} 107 108 109static int macvlan_broadcast_one(struct sk_buff *skb, 110 const struct macvlan_dev *vlan, 111 const struct ethhdr *eth, bool local) 112{ 113 struct net_device *dev = vlan->dev; 114 if (!skb) 115 return NET_RX_DROP; 116 117 if (local) 118 return vlan->forward(dev, skb); 119 120 skb->dev = dev; 121 if (!compare_ether_addr_64bits(eth->h_dest, 122 dev->broadcast)) 123 skb->pkt_type = PACKET_BROADCAST; 124 else 125 skb->pkt_type = PACKET_MULTICAST; 126 127 return vlan->receive(skb); 128} 129 130static void macvlan_broadcast(struct sk_buff *skb, 131 const struct macvlan_port *port, 132 struct net_device *src, 133 enum macvlan_mode mode) 134{ 135 const struct ethhdr *eth = eth_hdr(skb); 136 const struct macvlan_dev *vlan; 137 struct hlist_node *n; 138 struct sk_buff *nskb; 139 unsigned int i; 140 int err; 141 142 if (skb->protocol == htons(ETH_P_PAUSE)) 143 return; 144 145 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 146 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) { 147 if (vlan->dev == src || !(vlan->mode & mode)) 148 continue; 149 150 nskb = skb_clone(skb, GFP_ATOMIC); 151 err = macvlan_broadcast_one(nskb, vlan, eth, 152 mode == MACVLAN_MODE_BRIDGE); 153 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 154 err == NET_RX_SUCCESS, 1); 155 } 156 } 157} 158 159/* called under rcu_read_lock() from netif_receive_skb */ 160static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 161{ 162 struct macvlan_port *port; 163 struct sk_buff *skb = *pskb; 164 const struct ethhdr *eth = eth_hdr(skb); 165 const struct macvlan_dev *vlan; 166 const struct macvlan_dev *src; 167 struct net_device *dev; 168 unsigned int len = 0; 169 int ret = NET_RX_DROP; 170 171 port = macvlan_port_get_rcu(skb->dev); 172 if (is_multicast_ether_addr(eth->h_dest)) { 173 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN); 174 if (!skb) 175 return RX_HANDLER_CONSUMED; 176 src = macvlan_hash_lookup(port, eth->h_source); 177 if (!src) 178 /* frame comes from an external address */ 179 macvlan_broadcast(skb, port, NULL, 180 MACVLAN_MODE_PRIVATE | 181 MACVLAN_MODE_VEPA | 182 MACVLAN_MODE_PASSTHRU| 183 MACVLAN_MODE_BRIDGE); 184 else if (src->mode == MACVLAN_MODE_VEPA) 185 /* flood to everyone except source */ 186 macvlan_broadcast(skb, port, src->dev, 187 MACVLAN_MODE_VEPA | 188 MACVLAN_MODE_BRIDGE); 189 else if (src->mode == MACVLAN_MODE_BRIDGE) 190 /* 191 * flood only to VEPA ports, bridge ports 192 * already saw the frame on the way out. 193 */ 194 macvlan_broadcast(skb, port, src->dev, 195 MACVLAN_MODE_VEPA); 196 else { 197 /* forward to original port. */ 198 vlan = src; 199 ret = macvlan_broadcast_one(skb, vlan, eth, 0); 200 goto out; 201 } 202 203 return RX_HANDLER_PASS; 204 } 205 206 if (port->passthru) 207 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list); 208 else 209 vlan = macvlan_hash_lookup(port, eth->h_dest); 210 if (vlan == NULL) 211 return RX_HANDLER_PASS; 212 213 dev = vlan->dev; 214 if (unlikely(!(dev->flags & IFF_UP))) { 215 kfree_skb(skb); 216 return RX_HANDLER_CONSUMED; 217 } 218 len = skb->len + ETH_HLEN; 219 skb = skb_share_check(skb, GFP_ATOMIC); 220 if (!skb) 221 goto out; 222 223 skb->dev = dev; 224 skb->pkt_type = PACKET_HOST; 225 226 ret = vlan->receive(skb); 227 228out: 229 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); 230 return RX_HANDLER_CONSUMED; 231} 232 233static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 234{ 235 const struct macvlan_dev *vlan = netdev_priv(dev); 236 const struct macvlan_port *port = vlan->port; 237 const struct macvlan_dev *dest; 238 __u8 ip_summed = skb->ip_summed; 239 240 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 241 const struct ethhdr *eth = (void *)skb->data; 242 skb->ip_summed = CHECKSUM_UNNECESSARY; 243 244 /* send to other bridge ports directly */ 245 if (is_multicast_ether_addr(eth->h_dest)) { 246 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 247 goto xmit_world; 248 } 249 250 dest = macvlan_hash_lookup(port, eth->h_dest); 251 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 252 /* send to lowerdev first for its network taps */ 253 dev_forward_skb(vlan->lowerdev, skb); 254 255 return NET_XMIT_SUCCESS; 256 } 257 } 258 259xmit_world: 260 skb->ip_summed = ip_summed; 261 skb_set_dev(skb, vlan->lowerdev); 262 return dev_queue_xmit(skb); 263} 264 265netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 266 struct net_device *dev) 267{ 268 unsigned int len = skb->len; 269 int ret; 270 const struct macvlan_dev *vlan = netdev_priv(dev); 271 272 ret = macvlan_queue_xmit(skb, dev); 273 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 274 struct macvlan_pcpu_stats *pcpu_stats; 275 276 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 277 u64_stats_update_begin(&pcpu_stats->syncp); 278 pcpu_stats->tx_packets++; 279 pcpu_stats->tx_bytes += len; 280 u64_stats_update_end(&pcpu_stats->syncp); 281 } else { 282 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 283 } 284 return ret; 285} 286EXPORT_SYMBOL_GPL(macvlan_start_xmit); 287 288static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 289 unsigned short type, const void *daddr, 290 const void *saddr, unsigned len) 291{ 292 const struct macvlan_dev *vlan = netdev_priv(dev); 293 struct net_device *lowerdev = vlan->lowerdev; 294 295 return dev_hard_header(skb, lowerdev, type, daddr, 296 saddr ? : dev->dev_addr, len); 297} 298 299static const struct header_ops macvlan_hard_header_ops = { 300 .create = macvlan_hard_header, 301 .rebuild = eth_rebuild_header, 302 .parse = eth_header_parse, 303 .cache = eth_header_cache, 304 .cache_update = eth_header_cache_update, 305}; 306 307static int macvlan_open(struct net_device *dev) 308{ 309 struct macvlan_dev *vlan = netdev_priv(dev); 310 struct net_device *lowerdev = vlan->lowerdev; 311 int err; 312 313 if (vlan->port->passthru) { 314 dev_set_promiscuity(lowerdev, 1); 315 goto hash_add; 316 } 317 318 err = -EBUSY; 319 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 320 goto out; 321 322 err = dev_uc_add(lowerdev, dev->dev_addr); 323 if (err < 0) 324 goto out; 325 if (dev->flags & IFF_ALLMULTI) { 326 err = dev_set_allmulti(lowerdev, 1); 327 if (err < 0) 328 goto del_unicast; 329 } 330 331hash_add: 332 macvlan_hash_add(vlan); 333 return 0; 334 335del_unicast: 336 dev_uc_del(lowerdev, dev->dev_addr); 337out: 338 return err; 339} 340 341static int macvlan_stop(struct net_device *dev) 342{ 343 struct macvlan_dev *vlan = netdev_priv(dev); 344 struct net_device *lowerdev = vlan->lowerdev; 345 346 if (vlan->port->passthru) { 347 dev_set_promiscuity(lowerdev, -1); 348 goto hash_del; 349 } 350 351 dev_mc_unsync(lowerdev, dev); 352 if (dev->flags & IFF_ALLMULTI) 353 dev_set_allmulti(lowerdev, -1); 354 355 dev_uc_del(lowerdev, dev->dev_addr); 356 357hash_del: 358 macvlan_hash_del(vlan, !dev->dismantle); 359 return 0; 360} 361 362static int macvlan_set_mac_address(struct net_device *dev, void *p) 363{ 364 struct macvlan_dev *vlan = netdev_priv(dev); 365 struct net_device *lowerdev = vlan->lowerdev; 366 struct sockaddr *addr = p; 367 int err; 368 369 if (!is_valid_ether_addr(addr->sa_data)) 370 return -EADDRNOTAVAIL; 371 372 if (!(dev->flags & IFF_UP)) { 373 /* Just copy in the new address */ 374 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 375 } else { 376 /* Rehash and update the device filters */ 377 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 378 return -EBUSY; 379 380 err = dev_uc_add(lowerdev, addr->sa_data); 381 if (err) 382 return err; 383 384 dev_uc_del(lowerdev, dev->dev_addr); 385 386 macvlan_hash_change_addr(vlan, addr->sa_data); 387 } 388 return 0; 389} 390 391static void macvlan_change_rx_flags(struct net_device *dev, int change) 392{ 393 struct macvlan_dev *vlan = netdev_priv(dev); 394 struct net_device *lowerdev = vlan->lowerdev; 395 396 if (change & IFF_ALLMULTI) 397 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 398} 399 400static void macvlan_set_multicast_list(struct net_device *dev) 401{ 402 struct macvlan_dev *vlan = netdev_priv(dev); 403 404 dev_mc_sync(vlan->lowerdev, dev); 405} 406 407static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 408{ 409 struct macvlan_dev *vlan = netdev_priv(dev); 410 411 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 412 return -EINVAL; 413 dev->mtu = new_mtu; 414 return 0; 415} 416 417/* 418 * macvlan network devices have devices nesting below it and are a special 419 * "super class" of normal network devices; split their locks off into a 420 * separate class since they always nest. 421 */ 422static struct lock_class_key macvlan_netdev_xmit_lock_key; 423static struct lock_class_key macvlan_netdev_addr_lock_key; 424 425#define MACVLAN_FEATURES \ 426 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 427 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 428 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 429 NETIF_F_HW_VLAN_FILTER) 430 431#define MACVLAN_STATE_MASK \ 432 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 433 434static void macvlan_set_lockdep_class_one(struct net_device *dev, 435 struct netdev_queue *txq, 436 void *_unused) 437{ 438 lockdep_set_class(&txq->_xmit_lock, 439 &macvlan_netdev_xmit_lock_key); 440} 441 442static void macvlan_set_lockdep_class(struct net_device *dev) 443{ 444 lockdep_set_class(&dev->addr_list_lock, 445 &macvlan_netdev_addr_lock_key); 446 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 447} 448 449static int macvlan_init(struct net_device *dev) 450{ 451 struct macvlan_dev *vlan = netdev_priv(dev); 452 const struct net_device *lowerdev = vlan->lowerdev; 453 454 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 455 (lowerdev->state & MACVLAN_STATE_MASK); 456 dev->features = lowerdev->features & MACVLAN_FEATURES; 457 dev->features |= NETIF_F_LLTX; 458 dev->gso_max_size = lowerdev->gso_max_size; 459 dev->iflink = lowerdev->ifindex; 460 dev->hard_header_len = lowerdev->hard_header_len; 461 462 macvlan_set_lockdep_class(dev); 463 464 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats); 465 if (!vlan->pcpu_stats) 466 return -ENOMEM; 467 468 return 0; 469} 470 471static void macvlan_uninit(struct net_device *dev) 472{ 473 struct macvlan_dev *vlan = netdev_priv(dev); 474 struct macvlan_port *port = vlan->port; 475 476 free_percpu(vlan->pcpu_stats); 477 478 port->count -= 1; 479 if (!port->count) 480 macvlan_port_destroy(port->dev); 481} 482 483static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 484 struct rtnl_link_stats64 *stats) 485{ 486 struct macvlan_dev *vlan = netdev_priv(dev); 487 488 if (vlan->pcpu_stats) { 489 struct macvlan_pcpu_stats *p; 490 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 491 u32 rx_errors = 0, tx_dropped = 0; 492 unsigned int start; 493 int i; 494 495 for_each_possible_cpu(i) { 496 p = per_cpu_ptr(vlan->pcpu_stats, i); 497 do { 498 start = u64_stats_fetch_begin_bh(&p->syncp); 499 rx_packets = p->rx_packets; 500 rx_bytes = p->rx_bytes; 501 rx_multicast = p->rx_multicast; 502 tx_packets = p->tx_packets; 503 tx_bytes = p->tx_bytes; 504 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 505 506 stats->rx_packets += rx_packets; 507 stats->rx_bytes += rx_bytes; 508 stats->multicast += rx_multicast; 509 stats->tx_packets += tx_packets; 510 stats->tx_bytes += tx_bytes; 511 /* rx_errors & tx_dropped are u32, updated 512 * without syncp protection. 513 */ 514 rx_errors += p->rx_errors; 515 tx_dropped += p->tx_dropped; 516 } 517 stats->rx_errors = rx_errors; 518 stats->rx_dropped = rx_errors; 519 stats->tx_dropped = tx_dropped; 520 } 521 return stats; 522} 523 524static int macvlan_vlan_rx_add_vid(struct net_device *dev, 525 unsigned short vid) 526{ 527 struct macvlan_dev *vlan = netdev_priv(dev); 528 struct net_device *lowerdev = vlan->lowerdev; 529 530 return vlan_vid_add(lowerdev, vid); 531} 532 533static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 534 unsigned short vid) 535{ 536 struct macvlan_dev *vlan = netdev_priv(dev); 537 struct net_device *lowerdev = vlan->lowerdev; 538 539 vlan_vid_del(lowerdev, vid); 540 return 0; 541} 542 543static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 544 struct ethtool_drvinfo *drvinfo) 545{ 546 snprintf(drvinfo->driver, 32, "macvlan"); 547 snprintf(drvinfo->version, 32, "0.1"); 548} 549 550static int macvlan_ethtool_get_settings(struct net_device *dev, 551 struct ethtool_cmd *cmd) 552{ 553 const struct macvlan_dev *vlan = netdev_priv(dev); 554 555 return __ethtool_get_settings(vlan->lowerdev, cmd); 556} 557 558static const struct ethtool_ops macvlan_ethtool_ops = { 559 .get_link = ethtool_op_get_link, 560 .get_settings = macvlan_ethtool_get_settings, 561 .get_drvinfo = macvlan_ethtool_get_drvinfo, 562}; 563 564static const struct net_device_ops macvlan_netdev_ops = { 565 .ndo_init = macvlan_init, 566 .ndo_uninit = macvlan_uninit, 567 .ndo_open = macvlan_open, 568 .ndo_stop = macvlan_stop, 569 .ndo_start_xmit = macvlan_start_xmit, 570 .ndo_change_mtu = macvlan_change_mtu, 571 .ndo_change_rx_flags = macvlan_change_rx_flags, 572 .ndo_set_mac_address = macvlan_set_mac_address, 573 .ndo_set_rx_mode = macvlan_set_multicast_list, 574 .ndo_get_stats64 = macvlan_dev_get_stats64, 575 .ndo_validate_addr = eth_validate_addr, 576 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 577 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 578}; 579 580void macvlan_common_setup(struct net_device *dev) 581{ 582 ether_setup(dev); 583 584 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 585 dev->netdev_ops = &macvlan_netdev_ops; 586 dev->destructor = free_netdev; 587 dev->header_ops = &macvlan_hard_header_ops, 588 dev->ethtool_ops = &macvlan_ethtool_ops; 589} 590EXPORT_SYMBOL_GPL(macvlan_common_setup); 591 592static void macvlan_setup(struct net_device *dev) 593{ 594 macvlan_common_setup(dev); 595 dev->tx_queue_len = 0; 596} 597 598static int macvlan_port_create(struct net_device *dev) 599{ 600 struct macvlan_port *port; 601 unsigned int i; 602 int err; 603 604 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 605 return -EINVAL; 606 607 port = kzalloc(sizeof(*port), GFP_KERNEL); 608 if (port == NULL) 609 return -ENOMEM; 610 611 port->passthru = false; 612 port->dev = dev; 613 INIT_LIST_HEAD(&port->vlans); 614 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 615 INIT_HLIST_HEAD(&port->vlan_hash[i]); 616 617 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 618 if (err) 619 kfree(port); 620 else 621 dev->priv_flags |= IFF_MACVLAN_PORT; 622 return err; 623} 624 625static void macvlan_port_destroy(struct net_device *dev) 626{ 627 struct macvlan_port *port = macvlan_port_get(dev); 628 629 dev->priv_flags &= ~IFF_MACVLAN_PORT; 630 netdev_rx_handler_unregister(dev); 631 kfree_rcu(port, rcu); 632} 633 634static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 635{ 636 if (tb[IFLA_ADDRESS]) { 637 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 638 return -EINVAL; 639 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 640 return -EADDRNOTAVAIL; 641 } 642 643 if (data && data[IFLA_MACVLAN_MODE]) { 644 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 645 case MACVLAN_MODE_PRIVATE: 646 case MACVLAN_MODE_VEPA: 647 case MACVLAN_MODE_BRIDGE: 648 case MACVLAN_MODE_PASSTHRU: 649 break; 650 default: 651 return -EINVAL; 652 } 653 } 654 return 0; 655} 656 657int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 658 struct nlattr *tb[], struct nlattr *data[], 659 int (*receive)(struct sk_buff *skb), 660 int (*forward)(struct net_device *dev, 661 struct sk_buff *skb)) 662{ 663 struct macvlan_dev *vlan = netdev_priv(dev); 664 struct macvlan_port *port; 665 struct net_device *lowerdev; 666 int err; 667 668 if (!tb[IFLA_LINK]) 669 return -EINVAL; 670 671 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 672 if (lowerdev == NULL) 673 return -ENODEV; 674 675 /* When creating macvlans on top of other macvlans - use 676 * the real device as the lowerdev. 677 */ 678 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { 679 struct macvlan_dev *lowervlan = netdev_priv(lowerdev); 680 lowerdev = lowervlan->lowerdev; 681 } 682 683 if (!tb[IFLA_MTU]) 684 dev->mtu = lowerdev->mtu; 685 else if (dev->mtu > lowerdev->mtu) 686 return -EINVAL; 687 688 if (!tb[IFLA_ADDRESS]) 689 random_ether_addr(dev->dev_addr); 690 691 if (!macvlan_port_exists(lowerdev)) { 692 err = macvlan_port_create(lowerdev); 693 if (err < 0) 694 return err; 695 } 696 port = macvlan_port_get(lowerdev); 697 698 /* Only 1 macvlan device can be created in passthru mode */ 699 if (port->passthru) 700 return -EINVAL; 701 702 vlan->lowerdev = lowerdev; 703 vlan->dev = dev; 704 vlan->port = port; 705 vlan->receive = receive; 706 vlan->forward = forward; 707 708 vlan->mode = MACVLAN_MODE_VEPA; 709 if (data && data[IFLA_MACVLAN_MODE]) 710 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 711 712 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 713 if (port->count) 714 return -EINVAL; 715 port->passthru = true; 716 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN); 717 } 718 719 port->count += 1; 720 err = register_netdevice(dev); 721 if (err < 0) 722 goto destroy_port; 723 724 list_add_tail(&vlan->list, &port->vlans); 725 netif_stacked_transfer_operstate(lowerdev, dev); 726 727 return 0; 728 729destroy_port: 730 port->count -= 1; 731 if (!port->count) 732 macvlan_port_destroy(lowerdev); 733 734 return err; 735} 736EXPORT_SYMBOL_GPL(macvlan_common_newlink); 737 738static int macvlan_newlink(struct net *src_net, struct net_device *dev, 739 struct nlattr *tb[], struct nlattr *data[]) 740{ 741 return macvlan_common_newlink(src_net, dev, tb, data, 742 netif_rx, 743 dev_forward_skb); 744} 745 746void macvlan_dellink(struct net_device *dev, struct list_head *head) 747{ 748 struct macvlan_dev *vlan = netdev_priv(dev); 749 750 list_del(&vlan->list); 751 unregister_netdevice_queue(dev, head); 752} 753EXPORT_SYMBOL_GPL(macvlan_dellink); 754 755static int macvlan_changelink(struct net_device *dev, 756 struct nlattr *tb[], struct nlattr *data[]) 757{ 758 struct macvlan_dev *vlan = netdev_priv(dev); 759 if (data && data[IFLA_MACVLAN_MODE]) 760 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 761 return 0; 762} 763 764static size_t macvlan_get_size(const struct net_device *dev) 765{ 766 return nla_total_size(4); 767} 768 769static int macvlan_fill_info(struct sk_buff *skb, 770 const struct net_device *dev) 771{ 772 struct macvlan_dev *vlan = netdev_priv(dev); 773 774 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode); 775 return 0; 776 777nla_put_failure: 778 return -EMSGSIZE; 779} 780 781static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 782 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 783}; 784 785int macvlan_link_register(struct rtnl_link_ops *ops) 786{ 787 /* common fields */ 788 ops->priv_size = sizeof(struct macvlan_dev); 789 ops->validate = macvlan_validate; 790 ops->maxtype = IFLA_MACVLAN_MAX; 791 ops->policy = macvlan_policy; 792 ops->changelink = macvlan_changelink; 793 ops->get_size = macvlan_get_size; 794 ops->fill_info = macvlan_fill_info; 795 796 return rtnl_link_register(ops); 797}; 798EXPORT_SYMBOL_GPL(macvlan_link_register); 799 800static struct rtnl_link_ops macvlan_link_ops = { 801 .kind = "macvlan", 802 .setup = macvlan_setup, 803 .newlink = macvlan_newlink, 804 .dellink = macvlan_dellink, 805}; 806 807static int macvlan_device_event(struct notifier_block *unused, 808 unsigned long event, void *ptr) 809{ 810 struct net_device *dev = ptr; 811 struct macvlan_dev *vlan, *next; 812 struct macvlan_port *port; 813 LIST_HEAD(list_kill); 814 815 if (!macvlan_port_exists(dev)) 816 return NOTIFY_DONE; 817 818 port = macvlan_port_get(dev); 819 820 switch (event) { 821 case NETDEV_CHANGE: 822 list_for_each_entry(vlan, &port->vlans, list) 823 netif_stacked_transfer_operstate(vlan->lowerdev, 824 vlan->dev); 825 break; 826 case NETDEV_FEAT_CHANGE: 827 list_for_each_entry(vlan, &port->vlans, list) { 828 vlan->dev->features = dev->features & MACVLAN_FEATURES; 829 vlan->dev->gso_max_size = dev->gso_max_size; 830 netdev_features_change(vlan->dev); 831 } 832 break; 833 case NETDEV_UNREGISTER: 834 /* twiddle thumbs on netns device moves */ 835 if (dev->reg_state != NETREG_UNREGISTERING) 836 break; 837 838 list_for_each_entry_safe(vlan, next, &port->vlans, list) 839 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 840 unregister_netdevice_many(&list_kill); 841 list_del(&list_kill); 842 break; 843 case NETDEV_PRE_TYPE_CHANGE: 844 /* Forbid underlaying device to change its type. */ 845 return NOTIFY_BAD; 846 } 847 return NOTIFY_DONE; 848} 849 850static struct notifier_block macvlan_notifier_block __read_mostly = { 851 .notifier_call = macvlan_device_event, 852}; 853 854static int __init macvlan_init_module(void) 855{ 856 int err; 857 858 register_netdevice_notifier(&macvlan_notifier_block); 859 860 err = macvlan_link_register(&macvlan_link_ops); 861 if (err < 0) 862 goto err1; 863 return 0; 864err1: 865 unregister_netdevice_notifier(&macvlan_notifier_block); 866 return err; 867} 868 869static void __exit macvlan_cleanup_module(void) 870{ 871 rtnl_link_unregister(&macvlan_link_ops); 872 unregister_netdevice_notifier(&macvlan_notifier_block); 873} 874 875module_init(macvlan_init_module); 876module_exit(macvlan_cleanup_module); 877 878MODULE_LICENSE("GPL"); 879MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 880MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 881MODULE_ALIAS_RTNL_LINK("macvlan"); 882