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