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