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_vlan.h> 30 #include <linux/if_link.h> 31 #include <linux/if_macvlan.h> 32 #include <net/rtnetlink.h> 33 #include <net/xfrm.h> 34 35 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE) 36 37 struct macvlan_port { 38 struct net_device *dev; 39 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 40 struct list_head vlans; 41 struct rcu_head rcu; 42 bool passthru; 43 int count; 44 }; 45 46 static void macvlan_port_destroy(struct net_device *dev); 47 48 #define macvlan_port_get_rcu(dev) \ 49 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data)) 50 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data) 51 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 52 53 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 54 const unsigned char *addr) 55 { 56 struct macvlan_dev *vlan; 57 struct hlist_node *n; 58 59 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) { 60 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr)) 61 return vlan; 62 } 63 return NULL; 64 } 65 66 static void macvlan_hash_add(struct macvlan_dev *vlan) 67 { 68 struct macvlan_port *port = vlan->port; 69 const unsigned char *addr = vlan->dev->dev_addr; 70 71 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); 72 } 73 74 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 75 { 76 hlist_del_rcu(&vlan->hlist); 77 if (sync) 78 synchronize_rcu(); 79 } 80 81 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 82 const unsigned char *addr) 83 { 84 macvlan_hash_del(vlan, true); 85 /* Now that we are unhashed it is safe to change the device 86 * address without confusing packet delivery. 87 */ 88 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 89 macvlan_hash_add(vlan); 90 } 91 92 static int macvlan_addr_busy(const struct macvlan_port *port, 93 const unsigned char *addr) 94 { 95 /* Test to see if the specified multicast address is 96 * currently in use by the underlying device or 97 * another macvlan. 98 */ 99 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr)) 100 return 1; 101 102 if (macvlan_hash_lookup(port, addr)) 103 return 1; 104 105 return 0; 106 } 107 108 109 static int macvlan_broadcast_one(struct sk_buff *skb, 110 const struct macvlan_dev *vlan, 111 const struct ethhdr *eth, bool local) 112 { 113 struct net_device *dev = vlan->dev; 114 if (!skb) 115 return NET_RX_DROP; 116 117 if (local) 118 return vlan->forward(dev, skb); 119 120 skb->dev = dev; 121 if (!compare_ether_addr_64bits(eth->h_dest, 122 dev->broadcast)) 123 skb->pkt_type = PACKET_BROADCAST; 124 else 125 skb->pkt_type = PACKET_MULTICAST; 126 127 return vlan->receive(skb); 128 } 129 130 static void macvlan_broadcast(struct sk_buff *skb, 131 const struct macvlan_port *port, 132 struct net_device *src, 133 enum macvlan_mode mode) 134 { 135 const struct ethhdr *eth = eth_hdr(skb); 136 const struct macvlan_dev *vlan; 137 struct hlist_node *n; 138 struct sk_buff *nskb; 139 unsigned int i; 140 int err; 141 142 if (skb->protocol == htons(ETH_P_PAUSE)) 143 return; 144 145 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 146 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) { 147 if (vlan->dev == src || !(vlan->mode & mode)) 148 continue; 149 150 nskb = skb_clone(skb, GFP_ATOMIC); 151 err = macvlan_broadcast_one(nskb, vlan, eth, 152 mode == MACVLAN_MODE_BRIDGE); 153 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 154 err == NET_RX_SUCCESS, 1); 155 } 156 } 157 } 158 159 /* called under rcu_read_lock() from netif_receive_skb */ 160 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 161 { 162 struct macvlan_port *port; 163 struct sk_buff *skb = *pskb; 164 const struct ethhdr *eth = eth_hdr(skb); 165 const struct macvlan_dev *vlan; 166 const struct macvlan_dev *src; 167 struct net_device *dev; 168 unsigned int len = 0; 169 int ret = NET_RX_DROP; 170 171 port = macvlan_port_get_rcu(skb->dev); 172 if (is_multicast_ether_addr(eth->h_dest)) { 173 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN); 174 if (!skb) 175 return RX_HANDLER_CONSUMED; 176 eth = eth_hdr(skb); 177 src = macvlan_hash_lookup(port, eth->h_source); 178 if (!src) 179 /* frame comes from an external address */ 180 macvlan_broadcast(skb, port, NULL, 181 MACVLAN_MODE_PRIVATE | 182 MACVLAN_MODE_VEPA | 183 MACVLAN_MODE_PASSTHRU| 184 MACVLAN_MODE_BRIDGE); 185 else if (src->mode == MACVLAN_MODE_VEPA) 186 /* flood to everyone except source */ 187 macvlan_broadcast(skb, port, src->dev, 188 MACVLAN_MODE_VEPA | 189 MACVLAN_MODE_BRIDGE); 190 else if (src->mode == MACVLAN_MODE_BRIDGE) 191 /* 192 * flood only to VEPA ports, bridge ports 193 * already saw the frame on the way out. 194 */ 195 macvlan_broadcast(skb, port, src->dev, 196 MACVLAN_MODE_VEPA); 197 else { 198 /* forward to original port. */ 199 vlan = src; 200 ret = macvlan_broadcast_one(skb, vlan, eth, 0); 201 goto out; 202 } 203 204 return RX_HANDLER_PASS; 205 } 206 207 if (port->passthru) 208 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list); 209 else 210 vlan = macvlan_hash_lookup(port, eth->h_dest); 211 if (vlan == NULL) 212 return RX_HANDLER_PASS; 213 214 dev = vlan->dev; 215 if (unlikely(!(dev->flags & IFF_UP))) { 216 kfree_skb(skb); 217 return RX_HANDLER_CONSUMED; 218 } 219 len = skb->len + ETH_HLEN; 220 skb = skb_share_check(skb, GFP_ATOMIC); 221 if (!skb) 222 goto out; 223 224 skb->dev = dev; 225 skb->pkt_type = PACKET_HOST; 226 227 ret = vlan->receive(skb); 228 229 out: 230 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); 231 return RX_HANDLER_CONSUMED; 232 } 233 234 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 235 { 236 const struct macvlan_dev *vlan = netdev_priv(dev); 237 const struct macvlan_port *port = vlan->port; 238 const struct macvlan_dev *dest; 239 __u8 ip_summed = skb->ip_summed; 240 241 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 242 const struct ethhdr *eth = (void *)skb->data; 243 skb->ip_summed = CHECKSUM_UNNECESSARY; 244 245 /* send to other bridge ports directly */ 246 if (is_multicast_ether_addr(eth->h_dest)) { 247 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 248 goto xmit_world; 249 } 250 251 dest = macvlan_hash_lookup(port, eth->h_dest); 252 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 253 /* send to lowerdev first for its network taps */ 254 dev_forward_skb(vlan->lowerdev, skb); 255 256 return NET_XMIT_SUCCESS; 257 } 258 } 259 260 xmit_world: 261 skb->ip_summed = ip_summed; 262 skb_set_dev(skb, vlan->lowerdev); 263 return dev_queue_xmit(skb); 264 } 265 266 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 267 struct net_device *dev) 268 { 269 unsigned int len = skb->len; 270 int ret; 271 const struct macvlan_dev *vlan = netdev_priv(dev); 272 273 ret = macvlan_queue_xmit(skb, dev); 274 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 275 struct macvlan_pcpu_stats *pcpu_stats; 276 277 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 278 u64_stats_update_begin(&pcpu_stats->syncp); 279 pcpu_stats->tx_packets++; 280 pcpu_stats->tx_bytes += len; 281 u64_stats_update_end(&pcpu_stats->syncp); 282 } else { 283 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 284 } 285 return ret; 286 } 287 EXPORT_SYMBOL_GPL(macvlan_start_xmit); 288 289 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 290 unsigned short type, const void *daddr, 291 const void *saddr, unsigned len) 292 { 293 const struct macvlan_dev *vlan = netdev_priv(dev); 294 struct net_device *lowerdev = vlan->lowerdev; 295 296 return dev_hard_header(skb, lowerdev, type, daddr, 297 saddr ? : dev->dev_addr, len); 298 } 299 300 static const struct header_ops macvlan_hard_header_ops = { 301 .create = macvlan_hard_header, 302 .rebuild = eth_rebuild_header, 303 .parse = eth_header_parse, 304 .cache = eth_header_cache, 305 .cache_update = eth_header_cache_update, 306 }; 307 308 static int macvlan_open(struct net_device *dev) 309 { 310 struct macvlan_dev *vlan = netdev_priv(dev); 311 struct net_device *lowerdev = vlan->lowerdev; 312 int err; 313 314 if (vlan->port->passthru) { 315 dev_set_promiscuity(lowerdev, 1); 316 goto hash_add; 317 } 318 319 err = -EBUSY; 320 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 321 goto out; 322 323 err = dev_uc_add(lowerdev, dev->dev_addr); 324 if (err < 0) 325 goto out; 326 if (dev->flags & IFF_ALLMULTI) { 327 err = dev_set_allmulti(lowerdev, 1); 328 if (err < 0) 329 goto del_unicast; 330 } 331 332 hash_add: 333 macvlan_hash_add(vlan); 334 return 0; 335 336 del_unicast: 337 dev_uc_del(lowerdev, dev->dev_addr); 338 out: 339 return err; 340 } 341 342 static int macvlan_stop(struct net_device *dev) 343 { 344 struct macvlan_dev *vlan = netdev_priv(dev); 345 struct net_device *lowerdev = vlan->lowerdev; 346 347 if (vlan->port->passthru) { 348 dev_set_promiscuity(lowerdev, -1); 349 goto hash_del; 350 } 351 352 dev_mc_unsync(lowerdev, dev); 353 if (dev->flags & IFF_ALLMULTI) 354 dev_set_allmulti(lowerdev, -1); 355 356 dev_uc_del(lowerdev, dev->dev_addr); 357 358 hash_del: 359 macvlan_hash_del(vlan, !dev->dismantle); 360 return 0; 361 } 362 363 static int macvlan_set_mac_address(struct net_device *dev, void *p) 364 { 365 struct macvlan_dev *vlan = netdev_priv(dev); 366 struct net_device *lowerdev = vlan->lowerdev; 367 struct sockaddr *addr = p; 368 int err; 369 370 if (!is_valid_ether_addr(addr->sa_data)) 371 return -EADDRNOTAVAIL; 372 373 if (!(dev->flags & IFF_UP)) { 374 /* Just copy in the new address */ 375 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 376 } else { 377 /* Rehash and update the device filters */ 378 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 379 return -EBUSY; 380 381 err = dev_uc_add(lowerdev, addr->sa_data); 382 if (err) 383 return err; 384 385 dev_uc_del(lowerdev, dev->dev_addr); 386 387 macvlan_hash_change_addr(vlan, addr->sa_data); 388 } 389 return 0; 390 } 391 392 static void macvlan_change_rx_flags(struct net_device *dev, int change) 393 { 394 struct macvlan_dev *vlan = netdev_priv(dev); 395 struct net_device *lowerdev = vlan->lowerdev; 396 397 if (change & IFF_ALLMULTI) 398 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 399 } 400 401 static void macvlan_set_multicast_list(struct net_device *dev) 402 { 403 struct macvlan_dev *vlan = netdev_priv(dev); 404 405 dev_mc_sync(vlan->lowerdev, dev); 406 } 407 408 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 409 { 410 struct macvlan_dev *vlan = netdev_priv(dev); 411 412 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 413 return -EINVAL; 414 dev->mtu = new_mtu; 415 return 0; 416 } 417 418 /* 419 * macvlan network devices have devices nesting below it and are a special 420 * "super class" of normal network devices; split their locks off into a 421 * separate class since they always nest. 422 */ 423 static struct lock_class_key macvlan_netdev_xmit_lock_key; 424 static struct lock_class_key macvlan_netdev_addr_lock_key; 425 426 #define MACVLAN_FEATURES \ 427 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 428 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 429 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 430 NETIF_F_HW_VLAN_FILTER) 431 432 #define MACVLAN_STATE_MASK \ 433 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 434 435 static void macvlan_set_lockdep_class_one(struct net_device *dev, 436 struct netdev_queue *txq, 437 void *_unused) 438 { 439 lockdep_set_class(&txq->_xmit_lock, 440 &macvlan_netdev_xmit_lock_key); 441 } 442 443 static void macvlan_set_lockdep_class(struct net_device *dev) 444 { 445 lockdep_set_class(&dev->addr_list_lock, 446 &macvlan_netdev_addr_lock_key); 447 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 448 } 449 450 static int macvlan_init(struct net_device *dev) 451 { 452 struct macvlan_dev *vlan = netdev_priv(dev); 453 const struct net_device *lowerdev = vlan->lowerdev; 454 455 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 456 (lowerdev->state & MACVLAN_STATE_MASK); 457 dev->features = lowerdev->features & MACVLAN_FEATURES; 458 dev->features |= NETIF_F_LLTX; 459 dev->gso_max_size = lowerdev->gso_max_size; 460 dev->iflink = lowerdev->ifindex; 461 dev->hard_header_len = lowerdev->hard_header_len; 462 463 macvlan_set_lockdep_class(dev); 464 465 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats); 466 if (!vlan->pcpu_stats) 467 return -ENOMEM; 468 469 return 0; 470 } 471 472 static void macvlan_uninit(struct net_device *dev) 473 { 474 struct macvlan_dev *vlan = netdev_priv(dev); 475 struct macvlan_port *port = vlan->port; 476 477 free_percpu(vlan->pcpu_stats); 478 479 port->count -= 1; 480 if (!port->count) 481 macvlan_port_destroy(port->dev); 482 } 483 484 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 485 struct rtnl_link_stats64 *stats) 486 { 487 struct macvlan_dev *vlan = netdev_priv(dev); 488 489 if (vlan->pcpu_stats) { 490 struct macvlan_pcpu_stats *p; 491 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 492 u32 rx_errors = 0, tx_dropped = 0; 493 unsigned int start; 494 int i; 495 496 for_each_possible_cpu(i) { 497 p = per_cpu_ptr(vlan->pcpu_stats, i); 498 do { 499 start = u64_stats_fetch_begin_bh(&p->syncp); 500 rx_packets = p->rx_packets; 501 rx_bytes = p->rx_bytes; 502 rx_multicast = p->rx_multicast; 503 tx_packets = p->tx_packets; 504 tx_bytes = p->tx_bytes; 505 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 506 507 stats->rx_packets += rx_packets; 508 stats->rx_bytes += rx_bytes; 509 stats->multicast += rx_multicast; 510 stats->tx_packets += tx_packets; 511 stats->tx_bytes += tx_bytes; 512 /* rx_errors & tx_dropped are u32, updated 513 * without syncp protection. 514 */ 515 rx_errors += p->rx_errors; 516 tx_dropped += p->tx_dropped; 517 } 518 stats->rx_errors = rx_errors; 519 stats->rx_dropped = rx_errors; 520 stats->tx_dropped = tx_dropped; 521 } 522 return stats; 523 } 524 525 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 526 unsigned short vid) 527 { 528 struct macvlan_dev *vlan = netdev_priv(dev); 529 struct net_device *lowerdev = vlan->lowerdev; 530 531 return vlan_vid_add(lowerdev, vid); 532 } 533 534 static int 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; 539 540 vlan_vid_del(lowerdev, vid); 541 return 0; 542 } 543 544 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 545 struct ethtool_drvinfo *drvinfo) 546 { 547 snprintf(drvinfo->driver, 32, "macvlan"); 548 snprintf(drvinfo->version, 32, "0.1"); 549 } 550 551 static int macvlan_ethtool_get_settings(struct net_device *dev, 552 struct ethtool_cmd *cmd) 553 { 554 const struct macvlan_dev *vlan = netdev_priv(dev); 555 556 return __ethtool_get_settings(vlan->lowerdev, cmd); 557 } 558 559 static const struct ethtool_ops macvlan_ethtool_ops = { 560 .get_link = ethtool_op_get_link, 561 .get_settings = macvlan_ethtool_get_settings, 562 .get_drvinfo = macvlan_ethtool_get_drvinfo, 563 }; 564 565 static const struct net_device_ops macvlan_netdev_ops = { 566 .ndo_init = macvlan_init, 567 .ndo_uninit = macvlan_uninit, 568 .ndo_open = macvlan_open, 569 .ndo_stop = macvlan_stop, 570 .ndo_start_xmit = macvlan_start_xmit, 571 .ndo_change_mtu = macvlan_change_mtu, 572 .ndo_change_rx_flags = macvlan_change_rx_flags, 573 .ndo_set_mac_address = macvlan_set_mac_address, 574 .ndo_set_rx_mode = macvlan_set_multicast_list, 575 .ndo_get_stats64 = macvlan_dev_get_stats64, 576 .ndo_validate_addr = eth_validate_addr, 577 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 578 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 579 }; 580 581 void macvlan_common_setup(struct net_device *dev) 582 { 583 ether_setup(dev); 584 585 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 586 dev->netdev_ops = &macvlan_netdev_ops; 587 dev->destructor = free_netdev; 588 dev->header_ops = &macvlan_hard_header_ops, 589 dev->ethtool_ops = &macvlan_ethtool_ops; 590 } 591 EXPORT_SYMBOL_GPL(macvlan_common_setup); 592 593 static void macvlan_setup(struct net_device *dev) 594 { 595 macvlan_common_setup(dev); 596 dev->tx_queue_len = 0; 597 } 598 599 static int macvlan_port_create(struct net_device *dev) 600 { 601 struct macvlan_port *port; 602 unsigned int i; 603 int err; 604 605 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 606 return -EINVAL; 607 608 port = kzalloc(sizeof(*port), GFP_KERNEL); 609 if (port == NULL) 610 return -ENOMEM; 611 612 port->passthru = false; 613 port->dev = dev; 614 INIT_LIST_HEAD(&port->vlans); 615 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 616 INIT_HLIST_HEAD(&port->vlan_hash[i]); 617 618 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 619 if (err) 620 kfree(port); 621 else 622 dev->priv_flags |= IFF_MACVLAN_PORT; 623 return err; 624 } 625 626 static void macvlan_port_destroy(struct net_device *dev) 627 { 628 struct macvlan_port *port = macvlan_port_get(dev); 629 630 dev->priv_flags &= ~IFF_MACVLAN_PORT; 631 netdev_rx_handler_unregister(dev); 632 kfree_rcu(port, rcu); 633 } 634 635 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 636 { 637 if (tb[IFLA_ADDRESS]) { 638 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 639 return -EINVAL; 640 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 641 return -EADDRNOTAVAIL; 642 } 643 644 if (data && data[IFLA_MACVLAN_MODE]) { 645 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 646 case MACVLAN_MODE_PRIVATE: 647 case MACVLAN_MODE_VEPA: 648 case MACVLAN_MODE_BRIDGE: 649 case MACVLAN_MODE_PASSTHRU: 650 break; 651 default: 652 return -EINVAL; 653 } 654 } 655 return 0; 656 } 657 658 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 659 struct nlattr *tb[], struct nlattr *data[], 660 int (*receive)(struct sk_buff *skb), 661 int (*forward)(struct net_device *dev, 662 struct sk_buff *skb)) 663 { 664 struct macvlan_dev *vlan = netdev_priv(dev); 665 struct macvlan_port *port; 666 struct net_device *lowerdev; 667 int err; 668 669 if (!tb[IFLA_LINK]) 670 return -EINVAL; 671 672 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 673 if (lowerdev == NULL) 674 return -ENODEV; 675 676 /* When creating macvlans on top of other macvlans - use 677 * the real device as the lowerdev. 678 */ 679 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { 680 struct macvlan_dev *lowervlan = netdev_priv(lowerdev); 681 lowerdev = lowervlan->lowerdev; 682 } 683 684 if (!tb[IFLA_MTU]) 685 dev->mtu = lowerdev->mtu; 686 else if (dev->mtu > lowerdev->mtu) 687 return -EINVAL; 688 689 if (!tb[IFLA_ADDRESS]) 690 random_ether_addr(dev->dev_addr); 691 692 if (!macvlan_port_exists(lowerdev)) { 693 err = macvlan_port_create(lowerdev); 694 if (err < 0) 695 return err; 696 } 697 port = macvlan_port_get(lowerdev); 698 699 /* Only 1 macvlan device can be created in passthru mode */ 700 if (port->passthru) 701 return -EINVAL; 702 703 vlan->lowerdev = lowerdev; 704 vlan->dev = dev; 705 vlan->port = port; 706 vlan->receive = receive; 707 vlan->forward = forward; 708 709 vlan->mode = MACVLAN_MODE_VEPA; 710 if (data && data[IFLA_MACVLAN_MODE]) 711 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 712 713 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 714 if (port->count) 715 return -EINVAL; 716 port->passthru = true; 717 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN); 718 } 719 720 port->count += 1; 721 err = register_netdevice(dev); 722 if (err < 0) 723 goto destroy_port; 724 725 list_add_tail(&vlan->list, &port->vlans); 726 netif_stacked_transfer_operstate(lowerdev, dev); 727 728 return 0; 729 730 destroy_port: 731 port->count -= 1; 732 if (!port->count) 733 macvlan_port_destroy(lowerdev); 734 735 return err; 736 } 737 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 738 739 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 740 struct nlattr *tb[], struct nlattr *data[]) 741 { 742 return macvlan_common_newlink(src_net, dev, tb, data, 743 netif_rx, 744 dev_forward_skb); 745 } 746 747 void macvlan_dellink(struct net_device *dev, struct list_head *head) 748 { 749 struct macvlan_dev *vlan = netdev_priv(dev); 750 751 list_del(&vlan->list); 752 unregister_netdevice_queue(dev, head); 753 } 754 EXPORT_SYMBOL_GPL(macvlan_dellink); 755 756 static int macvlan_changelink(struct net_device *dev, 757 struct nlattr *tb[], struct nlattr *data[]) 758 { 759 struct macvlan_dev *vlan = netdev_priv(dev); 760 if (data && data[IFLA_MACVLAN_MODE]) 761 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 762 return 0; 763 } 764 765 static size_t macvlan_get_size(const struct net_device *dev) 766 { 767 return nla_total_size(4); 768 } 769 770 static int macvlan_fill_info(struct sk_buff *skb, 771 const struct net_device *dev) 772 { 773 struct macvlan_dev *vlan = netdev_priv(dev); 774 775 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode); 776 return 0; 777 778 nla_put_failure: 779 return -EMSGSIZE; 780 } 781 782 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 783 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 784 }; 785 786 int macvlan_link_register(struct rtnl_link_ops *ops) 787 { 788 /* common fields */ 789 ops->priv_size = sizeof(struct macvlan_dev); 790 ops->validate = macvlan_validate; 791 ops->maxtype = IFLA_MACVLAN_MAX; 792 ops->policy = macvlan_policy; 793 ops->changelink = macvlan_changelink; 794 ops->get_size = macvlan_get_size; 795 ops->fill_info = macvlan_fill_info; 796 797 return rtnl_link_register(ops); 798 }; 799 EXPORT_SYMBOL_GPL(macvlan_link_register); 800 801 static struct rtnl_link_ops macvlan_link_ops = { 802 .kind = "macvlan", 803 .setup = macvlan_setup, 804 .newlink = macvlan_newlink, 805 .dellink = macvlan_dellink, 806 }; 807 808 static int macvlan_device_event(struct notifier_block *unused, 809 unsigned long event, void *ptr) 810 { 811 struct net_device *dev = ptr; 812 struct macvlan_dev *vlan, *next; 813 struct macvlan_port *port; 814 LIST_HEAD(list_kill); 815 816 if (!macvlan_port_exists(dev)) 817 return NOTIFY_DONE; 818 819 port = macvlan_port_get(dev); 820 821 switch (event) { 822 case NETDEV_CHANGE: 823 list_for_each_entry(vlan, &port->vlans, list) 824 netif_stacked_transfer_operstate(vlan->lowerdev, 825 vlan->dev); 826 break; 827 case NETDEV_FEAT_CHANGE: 828 list_for_each_entry(vlan, &port->vlans, list) { 829 vlan->dev->features = dev->features & MACVLAN_FEATURES; 830 vlan->dev->gso_max_size = dev->gso_max_size; 831 netdev_features_change(vlan->dev); 832 } 833 break; 834 case NETDEV_UNREGISTER: 835 /* twiddle thumbs on netns device moves */ 836 if (dev->reg_state != NETREG_UNREGISTERING) 837 break; 838 839 list_for_each_entry_safe(vlan, next, &port->vlans, list) 840 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 841 unregister_netdevice_many(&list_kill); 842 list_del(&list_kill); 843 break; 844 case NETDEV_PRE_TYPE_CHANGE: 845 /* Forbid underlaying device to change its type. */ 846 return NOTIFY_BAD; 847 } 848 return NOTIFY_DONE; 849 } 850 851 static struct notifier_block macvlan_notifier_block __read_mostly = { 852 .notifier_call = macvlan_device_event, 853 }; 854 855 static int __init macvlan_init_module(void) 856 { 857 int err; 858 859 register_netdevice_notifier(&macvlan_notifier_block); 860 861 err = macvlan_link_register(&macvlan_link_ops); 862 if (err < 0) 863 goto err1; 864 return 0; 865 err1: 866 unregister_netdevice_notifier(&macvlan_notifier_block); 867 return err; 868 } 869 870 static void __exit macvlan_cleanup_module(void) 871 { 872 rtnl_link_unregister(&macvlan_link_ops); 873 unregister_netdevice_notifier(&macvlan_notifier_block); 874 } 875 876 module_init(macvlan_init_module); 877 module_exit(macvlan_cleanup_module); 878 879 MODULE_LICENSE("GPL"); 880 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 881 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 882 MODULE_ALIAS_RTNL_LINK("macvlan"); 883