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) 418 419 #define MACVLAN_STATE_MASK \ 420 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 421 422 static void macvlan_set_lockdep_class_one(struct net_device *dev, 423 struct netdev_queue *txq, 424 void *_unused) 425 { 426 lockdep_set_class(&txq->_xmit_lock, 427 &macvlan_netdev_xmit_lock_key); 428 } 429 430 static void macvlan_set_lockdep_class(struct net_device *dev) 431 { 432 lockdep_set_class(&dev->addr_list_lock, 433 &macvlan_netdev_addr_lock_key); 434 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 435 } 436 437 static int macvlan_init(struct net_device *dev) 438 { 439 struct macvlan_dev *vlan = netdev_priv(dev); 440 const struct net_device *lowerdev = vlan->lowerdev; 441 442 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 443 (lowerdev->state & MACVLAN_STATE_MASK); 444 dev->features = lowerdev->features & MACVLAN_FEATURES; 445 dev->features |= NETIF_F_LLTX; 446 dev->gso_max_size = lowerdev->gso_max_size; 447 dev->iflink = lowerdev->ifindex; 448 dev->hard_header_len = lowerdev->hard_header_len; 449 450 macvlan_set_lockdep_class(dev); 451 452 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats); 453 if (!vlan->pcpu_stats) 454 return -ENOMEM; 455 456 return 0; 457 } 458 459 static void macvlan_uninit(struct net_device *dev) 460 { 461 struct macvlan_dev *vlan = netdev_priv(dev); 462 struct macvlan_port *port = vlan->port; 463 464 free_percpu(vlan->pcpu_stats); 465 466 port->count -= 1; 467 if (!port->count) 468 macvlan_port_destroy(port->dev); 469 } 470 471 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 472 struct rtnl_link_stats64 *stats) 473 { 474 struct macvlan_dev *vlan = netdev_priv(dev); 475 476 if (vlan->pcpu_stats) { 477 struct macvlan_pcpu_stats *p; 478 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 479 u32 rx_errors = 0, tx_dropped = 0; 480 unsigned int start; 481 int i; 482 483 for_each_possible_cpu(i) { 484 p = per_cpu_ptr(vlan->pcpu_stats, i); 485 do { 486 start = u64_stats_fetch_begin_bh(&p->syncp); 487 rx_packets = p->rx_packets; 488 rx_bytes = p->rx_bytes; 489 rx_multicast = p->rx_multicast; 490 tx_packets = p->tx_packets; 491 tx_bytes = p->tx_bytes; 492 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 493 494 stats->rx_packets += rx_packets; 495 stats->rx_bytes += rx_bytes; 496 stats->multicast += rx_multicast; 497 stats->tx_packets += tx_packets; 498 stats->tx_bytes += tx_bytes; 499 /* rx_errors & tx_dropped are u32, updated 500 * without syncp protection. 501 */ 502 rx_errors += p->rx_errors; 503 tx_dropped += p->tx_dropped; 504 } 505 stats->rx_errors = rx_errors; 506 stats->rx_dropped = rx_errors; 507 stats->tx_dropped = tx_dropped; 508 } 509 return stats; 510 } 511 512 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 513 struct ethtool_drvinfo *drvinfo) 514 { 515 snprintf(drvinfo->driver, 32, "macvlan"); 516 snprintf(drvinfo->version, 32, "0.1"); 517 } 518 519 static int macvlan_ethtool_get_settings(struct net_device *dev, 520 struct ethtool_cmd *cmd) 521 { 522 const struct macvlan_dev *vlan = netdev_priv(dev); 523 return dev_ethtool_get_settings(vlan->lowerdev, cmd); 524 } 525 526 static const struct ethtool_ops macvlan_ethtool_ops = { 527 .get_link = ethtool_op_get_link, 528 .get_settings = macvlan_ethtool_get_settings, 529 .get_drvinfo = macvlan_ethtool_get_drvinfo, 530 }; 531 532 static const struct net_device_ops macvlan_netdev_ops = { 533 .ndo_init = macvlan_init, 534 .ndo_uninit = macvlan_uninit, 535 .ndo_open = macvlan_open, 536 .ndo_stop = macvlan_stop, 537 .ndo_start_xmit = macvlan_start_xmit, 538 .ndo_change_mtu = macvlan_change_mtu, 539 .ndo_change_rx_flags = macvlan_change_rx_flags, 540 .ndo_set_mac_address = macvlan_set_mac_address, 541 .ndo_set_multicast_list = macvlan_set_multicast_list, 542 .ndo_get_stats64 = macvlan_dev_get_stats64, 543 .ndo_validate_addr = eth_validate_addr, 544 }; 545 546 void macvlan_common_setup(struct net_device *dev) 547 { 548 ether_setup(dev); 549 550 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 551 dev->netdev_ops = &macvlan_netdev_ops; 552 dev->destructor = free_netdev; 553 dev->header_ops = &macvlan_hard_header_ops, 554 dev->ethtool_ops = &macvlan_ethtool_ops; 555 } 556 EXPORT_SYMBOL_GPL(macvlan_common_setup); 557 558 static void macvlan_setup(struct net_device *dev) 559 { 560 macvlan_common_setup(dev); 561 dev->tx_queue_len = 0; 562 } 563 564 static int macvlan_port_create(struct net_device *dev) 565 { 566 struct macvlan_port *port; 567 unsigned int i; 568 int err; 569 570 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 571 return -EINVAL; 572 573 port = kzalloc(sizeof(*port), GFP_KERNEL); 574 if (port == NULL) 575 return -ENOMEM; 576 577 port->passthru = false; 578 port->dev = dev; 579 INIT_LIST_HEAD(&port->vlans); 580 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 581 INIT_HLIST_HEAD(&port->vlan_hash[i]); 582 583 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 584 if (err) 585 kfree(port); 586 else 587 dev->priv_flags |= IFF_MACVLAN_PORT; 588 return err; 589 } 590 591 static void macvlan_port_destroy(struct net_device *dev) 592 { 593 struct macvlan_port *port = macvlan_port_get(dev); 594 595 dev->priv_flags &= ~IFF_MACVLAN_PORT; 596 netdev_rx_handler_unregister(dev); 597 kfree_rcu(port, rcu); 598 } 599 600 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 601 { 602 if (tb[IFLA_ADDRESS]) { 603 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 604 return -EINVAL; 605 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 606 return -EADDRNOTAVAIL; 607 } 608 609 if (data && data[IFLA_MACVLAN_MODE]) { 610 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 611 case MACVLAN_MODE_PRIVATE: 612 case MACVLAN_MODE_VEPA: 613 case MACVLAN_MODE_BRIDGE: 614 case MACVLAN_MODE_PASSTHRU: 615 break; 616 default: 617 return -EINVAL; 618 } 619 } 620 return 0; 621 } 622 623 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 624 struct nlattr *tb[], struct nlattr *data[], 625 int (*receive)(struct sk_buff *skb), 626 int (*forward)(struct net_device *dev, 627 struct sk_buff *skb)) 628 { 629 struct macvlan_dev *vlan = netdev_priv(dev); 630 struct macvlan_port *port; 631 struct net_device *lowerdev; 632 int err; 633 634 if (!tb[IFLA_LINK]) 635 return -EINVAL; 636 637 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 638 if (lowerdev == NULL) 639 return -ENODEV; 640 641 /* When creating macvlans on top of other macvlans - use 642 * the real device as the lowerdev. 643 */ 644 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { 645 struct macvlan_dev *lowervlan = netdev_priv(lowerdev); 646 lowerdev = lowervlan->lowerdev; 647 } 648 649 if (!tb[IFLA_MTU]) 650 dev->mtu = lowerdev->mtu; 651 else if (dev->mtu > lowerdev->mtu) 652 return -EINVAL; 653 654 if (!tb[IFLA_ADDRESS]) 655 random_ether_addr(dev->dev_addr); 656 657 if (!macvlan_port_exists(lowerdev)) { 658 err = macvlan_port_create(lowerdev); 659 if (err < 0) 660 return err; 661 } 662 port = macvlan_port_get(lowerdev); 663 664 /* Only 1 macvlan device can be created in passthru mode */ 665 if (port->passthru) 666 return -EINVAL; 667 668 vlan->lowerdev = lowerdev; 669 vlan->dev = dev; 670 vlan->port = port; 671 vlan->receive = receive; 672 vlan->forward = forward; 673 674 vlan->mode = MACVLAN_MODE_VEPA; 675 if (data && data[IFLA_MACVLAN_MODE]) 676 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 677 678 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 679 if (port->count) 680 return -EINVAL; 681 port->passthru = true; 682 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN); 683 } 684 685 port->count += 1; 686 err = register_netdevice(dev); 687 if (err < 0) 688 goto destroy_port; 689 690 list_add_tail(&vlan->list, &port->vlans); 691 netif_stacked_transfer_operstate(lowerdev, dev); 692 693 return 0; 694 695 destroy_port: 696 port->count -= 1; 697 if (!port->count) 698 macvlan_port_destroy(lowerdev); 699 700 return err; 701 } 702 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 703 704 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 705 struct nlattr *tb[], struct nlattr *data[]) 706 { 707 return macvlan_common_newlink(src_net, dev, tb, data, 708 netif_rx, 709 dev_forward_skb); 710 } 711 712 void macvlan_dellink(struct net_device *dev, struct list_head *head) 713 { 714 struct macvlan_dev *vlan = netdev_priv(dev); 715 716 list_del(&vlan->list); 717 unregister_netdevice_queue(dev, head); 718 } 719 EXPORT_SYMBOL_GPL(macvlan_dellink); 720 721 static int macvlan_changelink(struct net_device *dev, 722 struct nlattr *tb[], struct nlattr *data[]) 723 { 724 struct macvlan_dev *vlan = netdev_priv(dev); 725 if (data && data[IFLA_MACVLAN_MODE]) 726 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 727 return 0; 728 } 729 730 static size_t macvlan_get_size(const struct net_device *dev) 731 { 732 return nla_total_size(4); 733 } 734 735 static int macvlan_fill_info(struct sk_buff *skb, 736 const struct net_device *dev) 737 { 738 struct macvlan_dev *vlan = netdev_priv(dev); 739 740 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode); 741 return 0; 742 743 nla_put_failure: 744 return -EMSGSIZE; 745 } 746 747 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 748 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 749 }; 750 751 int macvlan_link_register(struct rtnl_link_ops *ops) 752 { 753 /* common fields */ 754 ops->priv_size = sizeof(struct macvlan_dev); 755 ops->validate = macvlan_validate; 756 ops->maxtype = IFLA_MACVLAN_MAX; 757 ops->policy = macvlan_policy; 758 ops->changelink = macvlan_changelink; 759 ops->get_size = macvlan_get_size; 760 ops->fill_info = macvlan_fill_info; 761 762 return rtnl_link_register(ops); 763 }; 764 EXPORT_SYMBOL_GPL(macvlan_link_register); 765 766 static struct rtnl_link_ops macvlan_link_ops = { 767 .kind = "macvlan", 768 .setup = macvlan_setup, 769 .newlink = macvlan_newlink, 770 .dellink = macvlan_dellink, 771 }; 772 773 static int macvlan_device_event(struct notifier_block *unused, 774 unsigned long event, void *ptr) 775 { 776 struct net_device *dev = ptr; 777 struct macvlan_dev *vlan, *next; 778 struct macvlan_port *port; 779 LIST_HEAD(list_kill); 780 781 if (!macvlan_port_exists(dev)) 782 return NOTIFY_DONE; 783 784 port = macvlan_port_get(dev); 785 786 switch (event) { 787 case NETDEV_CHANGE: 788 list_for_each_entry(vlan, &port->vlans, list) 789 netif_stacked_transfer_operstate(vlan->lowerdev, 790 vlan->dev); 791 break; 792 case NETDEV_FEAT_CHANGE: 793 list_for_each_entry(vlan, &port->vlans, list) { 794 vlan->dev->features = dev->features & MACVLAN_FEATURES; 795 vlan->dev->gso_max_size = dev->gso_max_size; 796 netdev_features_change(vlan->dev); 797 } 798 break; 799 case NETDEV_UNREGISTER: 800 /* twiddle thumbs on netns device moves */ 801 if (dev->reg_state != NETREG_UNREGISTERING) 802 break; 803 804 list_for_each_entry_safe(vlan, next, &port->vlans, list) 805 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 806 unregister_netdevice_many(&list_kill); 807 list_del(&list_kill); 808 break; 809 case NETDEV_PRE_TYPE_CHANGE: 810 /* Forbid underlaying device to change its type. */ 811 return NOTIFY_BAD; 812 } 813 return NOTIFY_DONE; 814 } 815 816 static struct notifier_block macvlan_notifier_block __read_mostly = { 817 .notifier_call = macvlan_device_event, 818 }; 819 820 static int __init macvlan_init_module(void) 821 { 822 int err; 823 824 register_netdevice_notifier(&macvlan_notifier_block); 825 826 err = macvlan_link_register(&macvlan_link_ops); 827 if (err < 0) 828 goto err1; 829 return 0; 830 err1: 831 unregister_netdevice_notifier(&macvlan_notifier_block); 832 return err; 833 } 834 835 static void __exit macvlan_cleanup_module(void) 836 { 837 rtnl_link_unregister(&macvlan_link_ops); 838 unregister_netdevice_notifier(&macvlan_notifier_block); 839 } 840 841 module_init(macvlan_init_module); 842 module_exit(macvlan_cleanup_module); 843 844 MODULE_LICENSE("GPL"); 845 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 846 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 847 MODULE_ALIAS_RTNL_LINK("macvlan"); 848