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 else { 196 /* forward to original port. */ 197 vlan = src; 198 ret = macvlan_broadcast_one(skb, vlan, eth, 0); 199 goto out; 200 } 201 202 return RX_HANDLER_PASS; 203 } 204 205 if (port->passthru) 206 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list); 207 else 208 vlan = macvlan_hash_lookup(port, eth->h_dest); 209 if (vlan == NULL) 210 return RX_HANDLER_PASS; 211 212 dev = vlan->dev; 213 if (unlikely(!(dev->flags & IFF_UP))) { 214 kfree_skb(skb); 215 return RX_HANDLER_CONSUMED; 216 } 217 len = skb->len + ETH_HLEN; 218 skb = skb_share_check(skb, GFP_ATOMIC); 219 if (!skb) 220 goto out; 221 222 skb->dev = dev; 223 skb->pkt_type = PACKET_HOST; 224 225 ret = vlan->receive(skb); 226 227 out: 228 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); 229 return RX_HANDLER_CONSUMED; 230 } 231 232 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 233 { 234 const struct macvlan_dev *vlan = netdev_priv(dev); 235 const struct macvlan_port *port = vlan->port; 236 const struct macvlan_dev *dest; 237 __u8 ip_summed = skb->ip_summed; 238 239 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 240 const struct ethhdr *eth = (void *)skb->data; 241 skb->ip_summed = CHECKSUM_UNNECESSARY; 242 243 /* send to other bridge ports directly */ 244 if (is_multicast_ether_addr(eth->h_dest)) { 245 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 246 goto xmit_world; 247 } 248 249 dest = macvlan_hash_lookup(port, eth->h_dest); 250 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 251 /* send to lowerdev first for its network taps */ 252 dev_forward_skb(vlan->lowerdev, skb); 253 254 return NET_XMIT_SUCCESS; 255 } 256 } 257 258 xmit_world: 259 skb->ip_summed = ip_summed; 260 skb_set_dev(skb, vlan->lowerdev); 261 return dev_queue_xmit(skb); 262 } 263 264 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 265 struct net_device *dev) 266 { 267 unsigned int len = skb->len; 268 int ret; 269 const struct macvlan_dev *vlan = netdev_priv(dev); 270 271 ret = macvlan_queue_xmit(skb, dev); 272 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 273 struct macvlan_pcpu_stats *pcpu_stats; 274 275 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 276 u64_stats_update_begin(&pcpu_stats->syncp); 277 pcpu_stats->tx_packets++; 278 pcpu_stats->tx_bytes += len; 279 u64_stats_update_end(&pcpu_stats->syncp); 280 } else { 281 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 282 } 283 return ret; 284 } 285 EXPORT_SYMBOL_GPL(macvlan_start_xmit); 286 287 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 288 unsigned short type, const void *daddr, 289 const void *saddr, unsigned len) 290 { 291 const struct macvlan_dev *vlan = netdev_priv(dev); 292 struct net_device *lowerdev = vlan->lowerdev; 293 294 return dev_hard_header(skb, lowerdev, type, daddr, 295 saddr ? : dev->dev_addr, len); 296 } 297 298 static const struct header_ops macvlan_hard_header_ops = { 299 .create = macvlan_hard_header, 300 .rebuild = eth_rebuild_header, 301 .parse = eth_header_parse, 302 .cache = eth_header_cache, 303 .cache_update = eth_header_cache_update, 304 }; 305 306 static int macvlan_open(struct net_device *dev) 307 { 308 struct macvlan_dev *vlan = netdev_priv(dev); 309 struct net_device *lowerdev = vlan->lowerdev; 310 int err; 311 312 if (vlan->port->passthru) { 313 dev_set_promiscuity(lowerdev, 1); 314 goto hash_add; 315 } 316 317 err = -EBUSY; 318 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 319 goto out; 320 321 err = dev_uc_add(lowerdev, dev->dev_addr); 322 if (err < 0) 323 goto out; 324 if (dev->flags & IFF_ALLMULTI) { 325 err = dev_set_allmulti(lowerdev, 1); 326 if (err < 0) 327 goto del_unicast; 328 } 329 330 hash_add: 331 macvlan_hash_add(vlan); 332 return 0; 333 334 del_unicast: 335 dev_uc_del(lowerdev, dev->dev_addr); 336 out: 337 return err; 338 } 339 340 static int macvlan_stop(struct net_device *dev) 341 { 342 struct macvlan_dev *vlan = netdev_priv(dev); 343 struct net_device *lowerdev = vlan->lowerdev; 344 345 if (vlan->port->passthru) { 346 dev_set_promiscuity(lowerdev, -1); 347 goto hash_del; 348 } 349 350 dev_mc_unsync(lowerdev, dev); 351 if (dev->flags & IFF_ALLMULTI) 352 dev_set_allmulti(lowerdev, -1); 353 354 dev_uc_del(lowerdev, dev->dev_addr); 355 356 hash_del: 357 macvlan_hash_del(vlan, !dev->dismantle); 358 return 0; 359 } 360 361 static int macvlan_set_mac_address(struct net_device *dev, void *p) 362 { 363 struct macvlan_dev *vlan = netdev_priv(dev); 364 struct net_device *lowerdev = vlan->lowerdev; 365 struct sockaddr *addr = p; 366 int err; 367 368 if (!is_valid_ether_addr(addr->sa_data)) 369 return -EADDRNOTAVAIL; 370 371 if (!(dev->flags & IFF_UP)) { 372 /* Just copy in the new address */ 373 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 374 } else { 375 /* Rehash and update the device filters */ 376 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 377 return -EBUSY; 378 379 err = dev_uc_add(lowerdev, addr->sa_data); 380 if (err) 381 return err; 382 383 dev_uc_del(lowerdev, dev->dev_addr); 384 385 macvlan_hash_change_addr(vlan, addr->sa_data); 386 } 387 return 0; 388 } 389 390 static void macvlan_change_rx_flags(struct net_device *dev, int change) 391 { 392 struct macvlan_dev *vlan = netdev_priv(dev); 393 struct net_device *lowerdev = vlan->lowerdev; 394 395 if (change & IFF_ALLMULTI) 396 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 397 } 398 399 static void macvlan_set_multicast_list(struct net_device *dev) 400 { 401 struct macvlan_dev *vlan = netdev_priv(dev); 402 403 dev_mc_sync(vlan->lowerdev, dev); 404 } 405 406 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 407 { 408 struct macvlan_dev *vlan = netdev_priv(dev); 409 410 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 411 return -EINVAL; 412 dev->mtu = new_mtu; 413 return 0; 414 } 415 416 /* 417 * macvlan network devices have devices nesting below it and are a special 418 * "super class" of normal network devices; split their locks off into a 419 * separate class since they always nest. 420 */ 421 static struct lock_class_key macvlan_netdev_xmit_lock_key; 422 static struct lock_class_key macvlan_netdev_addr_lock_key; 423 424 #define MACVLAN_FEATURES \ 425 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 426 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 427 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 428 NETIF_F_HW_VLAN_FILTER) 429 430 #define MACVLAN_STATE_MASK \ 431 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 432 433 static void macvlan_set_lockdep_class_one(struct net_device *dev, 434 struct netdev_queue *txq, 435 void *_unused) 436 { 437 lockdep_set_class(&txq->_xmit_lock, 438 &macvlan_netdev_xmit_lock_key); 439 } 440 441 static void macvlan_set_lockdep_class(struct net_device *dev) 442 { 443 lockdep_set_class(&dev->addr_list_lock, 444 &macvlan_netdev_addr_lock_key); 445 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 446 } 447 448 static int macvlan_init(struct net_device *dev) 449 { 450 struct macvlan_dev *vlan = netdev_priv(dev); 451 const struct net_device *lowerdev = vlan->lowerdev; 452 453 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 454 (lowerdev->state & MACVLAN_STATE_MASK); 455 dev->features = lowerdev->features & MACVLAN_FEATURES; 456 dev->features |= NETIF_F_LLTX; 457 dev->gso_max_size = lowerdev->gso_max_size; 458 dev->iflink = lowerdev->ifindex; 459 dev->hard_header_len = lowerdev->hard_header_len; 460 461 macvlan_set_lockdep_class(dev); 462 463 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats); 464 if (!vlan->pcpu_stats) 465 return -ENOMEM; 466 467 return 0; 468 } 469 470 static void macvlan_uninit(struct net_device *dev) 471 { 472 struct macvlan_dev *vlan = netdev_priv(dev); 473 struct macvlan_port *port = vlan->port; 474 475 free_percpu(vlan->pcpu_stats); 476 477 port->count -= 1; 478 if (!port->count) 479 macvlan_port_destroy(port->dev); 480 } 481 482 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 483 struct rtnl_link_stats64 *stats) 484 { 485 struct macvlan_dev *vlan = netdev_priv(dev); 486 487 if (vlan->pcpu_stats) { 488 struct macvlan_pcpu_stats *p; 489 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 490 u32 rx_errors = 0, tx_dropped = 0; 491 unsigned int start; 492 int i; 493 494 for_each_possible_cpu(i) { 495 p = per_cpu_ptr(vlan->pcpu_stats, i); 496 do { 497 start = u64_stats_fetch_begin_bh(&p->syncp); 498 rx_packets = p->rx_packets; 499 rx_bytes = p->rx_bytes; 500 rx_multicast = p->rx_multicast; 501 tx_packets = p->tx_packets; 502 tx_bytes = p->tx_bytes; 503 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 504 505 stats->rx_packets += rx_packets; 506 stats->rx_bytes += rx_bytes; 507 stats->multicast += rx_multicast; 508 stats->tx_packets += tx_packets; 509 stats->tx_bytes += tx_bytes; 510 /* rx_errors & tx_dropped are u32, updated 511 * without syncp protection. 512 */ 513 rx_errors += p->rx_errors; 514 tx_dropped += p->tx_dropped; 515 } 516 stats->rx_errors = rx_errors; 517 stats->rx_dropped = rx_errors; 518 stats->tx_dropped = tx_dropped; 519 } 520 return stats; 521 } 522 523 static void macvlan_vlan_rx_add_vid(struct net_device *dev, 524 unsigned short vid) 525 { 526 struct macvlan_dev *vlan = netdev_priv(dev); 527 struct net_device *lowerdev = vlan->lowerdev; 528 const struct net_device_ops *ops = lowerdev->netdev_ops; 529 530 if (ops->ndo_vlan_rx_add_vid) 531 ops->ndo_vlan_rx_add_vid(lowerdev, vid); 532 } 533 534 static void macvlan_vlan_rx_kill_vid(struct net_device *dev, 535 unsigned short vid) 536 { 537 struct macvlan_dev *vlan = netdev_priv(dev); 538 struct net_device *lowerdev = vlan->lowerdev; 539 const struct net_device_ops *ops = lowerdev->netdev_ops; 540 541 if (ops->ndo_vlan_rx_kill_vid) 542 ops->ndo_vlan_rx_kill_vid(lowerdev, vid); 543 } 544 545 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 546 struct ethtool_drvinfo *drvinfo) 547 { 548 snprintf(drvinfo->driver, 32, "macvlan"); 549 snprintf(drvinfo->version, 32, "0.1"); 550 } 551 552 static int macvlan_ethtool_get_settings(struct net_device *dev, 553 struct ethtool_cmd *cmd) 554 { 555 const struct macvlan_dev *vlan = netdev_priv(dev); 556 557 return __ethtool_get_settings(vlan->lowerdev, cmd); 558 } 559 560 static const struct ethtool_ops macvlan_ethtool_ops = { 561 .get_link = ethtool_op_get_link, 562 .get_settings = macvlan_ethtool_get_settings, 563 .get_drvinfo = macvlan_ethtool_get_drvinfo, 564 }; 565 566 static const struct net_device_ops macvlan_netdev_ops = { 567 .ndo_init = macvlan_init, 568 .ndo_uninit = macvlan_uninit, 569 .ndo_open = macvlan_open, 570 .ndo_stop = macvlan_stop, 571 .ndo_start_xmit = macvlan_start_xmit, 572 .ndo_change_mtu = macvlan_change_mtu, 573 .ndo_change_rx_flags = macvlan_change_rx_flags, 574 .ndo_set_mac_address = macvlan_set_mac_address, 575 .ndo_set_rx_mode = macvlan_set_multicast_list, 576 .ndo_get_stats64 = macvlan_dev_get_stats64, 577 .ndo_validate_addr = eth_validate_addr, 578 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 579 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 580 }; 581 582 void macvlan_common_setup(struct net_device *dev) 583 { 584 ether_setup(dev); 585 586 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 587 dev->netdev_ops = &macvlan_netdev_ops; 588 dev->destructor = free_netdev; 589 dev->header_ops = &macvlan_hard_header_ops, 590 dev->ethtool_ops = &macvlan_ethtool_ops; 591 } 592 EXPORT_SYMBOL_GPL(macvlan_common_setup); 593 594 static void macvlan_setup(struct net_device *dev) 595 { 596 macvlan_common_setup(dev); 597 dev->tx_queue_len = 0; 598 } 599 600 static int macvlan_port_create(struct net_device *dev) 601 { 602 struct macvlan_port *port; 603 unsigned int i; 604 int err; 605 606 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 607 return -EINVAL; 608 609 port = kzalloc(sizeof(*port), GFP_KERNEL); 610 if (port == NULL) 611 return -ENOMEM; 612 613 port->passthru = false; 614 port->dev = dev; 615 INIT_LIST_HEAD(&port->vlans); 616 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 617 INIT_HLIST_HEAD(&port->vlan_hash[i]); 618 619 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 620 if (err) 621 kfree(port); 622 else 623 dev->priv_flags |= IFF_MACVLAN_PORT; 624 return err; 625 } 626 627 static void macvlan_port_destroy(struct net_device *dev) 628 { 629 struct macvlan_port *port = macvlan_port_get(dev); 630 631 dev->priv_flags &= ~IFF_MACVLAN_PORT; 632 netdev_rx_handler_unregister(dev); 633 kfree_rcu(port, rcu); 634 } 635 636 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 637 { 638 if (tb[IFLA_ADDRESS]) { 639 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 640 return -EINVAL; 641 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 642 return -EADDRNOTAVAIL; 643 } 644 645 if (data && data[IFLA_MACVLAN_MODE]) { 646 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 647 case MACVLAN_MODE_PRIVATE: 648 case MACVLAN_MODE_VEPA: 649 case MACVLAN_MODE_BRIDGE: 650 case MACVLAN_MODE_PASSTHRU: 651 break; 652 default: 653 return -EINVAL; 654 } 655 } 656 return 0; 657 } 658 659 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 660 struct nlattr *tb[], struct nlattr *data[], 661 int (*receive)(struct sk_buff *skb), 662 int (*forward)(struct net_device *dev, 663 struct sk_buff *skb)) 664 { 665 struct macvlan_dev *vlan = netdev_priv(dev); 666 struct macvlan_port *port; 667 struct net_device *lowerdev; 668 int err; 669 670 if (!tb[IFLA_LINK]) 671 return -EINVAL; 672 673 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 674 if (lowerdev == NULL) 675 return -ENODEV; 676 677 /* When creating macvlans on top of other macvlans - use 678 * the real device as the lowerdev. 679 */ 680 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { 681 struct macvlan_dev *lowervlan = netdev_priv(lowerdev); 682 lowerdev = lowervlan->lowerdev; 683 } 684 685 if (!tb[IFLA_MTU]) 686 dev->mtu = lowerdev->mtu; 687 else if (dev->mtu > lowerdev->mtu) 688 return -EINVAL; 689 690 if (!tb[IFLA_ADDRESS]) 691 random_ether_addr(dev->dev_addr); 692 693 if (!macvlan_port_exists(lowerdev)) { 694 err = macvlan_port_create(lowerdev); 695 if (err < 0) 696 return err; 697 } 698 port = macvlan_port_get(lowerdev); 699 700 /* Only 1 macvlan device can be created in passthru mode */ 701 if (port->passthru) 702 return -EINVAL; 703 704 vlan->lowerdev = lowerdev; 705 vlan->dev = dev; 706 vlan->port = port; 707 vlan->receive = receive; 708 vlan->forward = forward; 709 710 vlan->mode = MACVLAN_MODE_VEPA; 711 if (data && data[IFLA_MACVLAN_MODE]) 712 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 713 714 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 715 if (port->count) 716 return -EINVAL; 717 port->passthru = true; 718 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN); 719 } 720 721 port->count += 1; 722 err = register_netdevice(dev); 723 if (err < 0) 724 goto destroy_port; 725 726 list_add_tail(&vlan->list, &port->vlans); 727 netif_stacked_transfer_operstate(lowerdev, dev); 728 729 return 0; 730 731 destroy_port: 732 port->count -= 1; 733 if (!port->count) 734 macvlan_port_destroy(lowerdev); 735 736 return err; 737 } 738 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 739 740 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 741 struct nlattr *tb[], struct nlattr *data[]) 742 { 743 return macvlan_common_newlink(src_net, dev, tb, data, 744 netif_rx, 745 dev_forward_skb); 746 } 747 748 void macvlan_dellink(struct net_device *dev, struct list_head *head) 749 { 750 struct macvlan_dev *vlan = netdev_priv(dev); 751 752 list_del(&vlan->list); 753 unregister_netdevice_queue(dev, head); 754 } 755 EXPORT_SYMBOL_GPL(macvlan_dellink); 756 757 static int macvlan_changelink(struct net_device *dev, 758 struct nlattr *tb[], struct nlattr *data[]) 759 { 760 struct macvlan_dev *vlan = netdev_priv(dev); 761 if (data && data[IFLA_MACVLAN_MODE]) 762 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 763 return 0; 764 } 765 766 static size_t macvlan_get_size(const struct net_device *dev) 767 { 768 return nla_total_size(4); 769 } 770 771 static int macvlan_fill_info(struct sk_buff *skb, 772 const struct net_device *dev) 773 { 774 struct macvlan_dev *vlan = netdev_priv(dev); 775 776 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode); 777 return 0; 778 779 nla_put_failure: 780 return -EMSGSIZE; 781 } 782 783 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 784 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 785 }; 786 787 int macvlan_link_register(struct rtnl_link_ops *ops) 788 { 789 /* common fields */ 790 ops->priv_size = sizeof(struct macvlan_dev); 791 ops->validate = macvlan_validate; 792 ops->maxtype = IFLA_MACVLAN_MAX; 793 ops->policy = macvlan_policy; 794 ops->changelink = macvlan_changelink; 795 ops->get_size = macvlan_get_size; 796 ops->fill_info = macvlan_fill_info; 797 798 return rtnl_link_register(ops); 799 }; 800 EXPORT_SYMBOL_GPL(macvlan_link_register); 801 802 static struct rtnl_link_ops macvlan_link_ops = { 803 .kind = "macvlan", 804 .setup = macvlan_setup, 805 .newlink = macvlan_newlink, 806 .dellink = macvlan_dellink, 807 }; 808 809 static int macvlan_device_event(struct notifier_block *unused, 810 unsigned long event, void *ptr) 811 { 812 struct net_device *dev = ptr; 813 struct macvlan_dev *vlan, *next; 814 struct macvlan_port *port; 815 LIST_HEAD(list_kill); 816 817 if (!macvlan_port_exists(dev)) 818 return NOTIFY_DONE; 819 820 port = macvlan_port_get(dev); 821 822 switch (event) { 823 case NETDEV_CHANGE: 824 list_for_each_entry(vlan, &port->vlans, list) 825 netif_stacked_transfer_operstate(vlan->lowerdev, 826 vlan->dev); 827 break; 828 case NETDEV_FEAT_CHANGE: 829 list_for_each_entry(vlan, &port->vlans, list) { 830 vlan->dev->features = dev->features & MACVLAN_FEATURES; 831 vlan->dev->gso_max_size = dev->gso_max_size; 832 netdev_features_change(vlan->dev); 833 } 834 break; 835 case NETDEV_UNREGISTER: 836 /* twiddle thumbs on netns device moves */ 837 if (dev->reg_state != NETREG_UNREGISTERING) 838 break; 839 840 list_for_each_entry_safe(vlan, next, &port->vlans, list) 841 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 842 unregister_netdevice_many(&list_kill); 843 list_del(&list_kill); 844 break; 845 case NETDEV_PRE_TYPE_CHANGE: 846 /* Forbid underlaying device to change its type. */ 847 return NOTIFY_BAD; 848 } 849 return NOTIFY_DONE; 850 } 851 852 static struct notifier_block macvlan_notifier_block __read_mostly = { 853 .notifier_call = macvlan_device_event, 854 }; 855 856 static int __init macvlan_init_module(void) 857 { 858 int err; 859 860 register_netdevice_notifier(&macvlan_notifier_block); 861 862 err = macvlan_link_register(&macvlan_link_ops); 863 if (err < 0) 864 goto err1; 865 return 0; 866 err1: 867 unregister_netdevice_notifier(&macvlan_notifier_block); 868 return err; 869 } 870 871 static void __exit macvlan_cleanup_module(void) 872 { 873 rtnl_link_unregister(&macvlan_link_ops); 874 unregister_netdevice_notifier(&macvlan_notifier_block); 875 } 876 877 module_init(macvlan_init_module); 878 module_exit(macvlan_cleanup_module); 879 880 MODULE_LICENSE("GPL"); 881 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 882 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 883 MODULE_ALIAS_RTNL_LINK("macvlan"); 884