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