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