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 (ether_addr_equal_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 (ether_addr_equal_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 (ether_addr_equal_64bits(eth->h_dest, 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 eth = eth_hdr(skb); 176 src = macvlan_hash_lookup(port, eth->h_source); 177 if (!src) 178 /* frame comes from an external address */ 179 macvlan_broadcast(skb, port, NULL, 180 MACVLAN_MODE_PRIVATE | 181 MACVLAN_MODE_VEPA | 182 MACVLAN_MODE_PASSTHRU| 183 MACVLAN_MODE_BRIDGE); 184 else if (src->mode == MACVLAN_MODE_VEPA) 185 /* flood to everyone except source */ 186 macvlan_broadcast(skb, port, src->dev, 187 MACVLAN_MODE_VEPA | 188 MACVLAN_MODE_BRIDGE); 189 else if (src->mode == MACVLAN_MODE_BRIDGE) 190 /* 191 * flood only to VEPA ports, bridge ports 192 * already saw the frame on the way out. 193 */ 194 macvlan_broadcast(skb, port, src->dev, 195 MACVLAN_MODE_VEPA); 196 else { 197 /* forward to original port. */ 198 vlan = src; 199 ret = macvlan_broadcast_one(skb, vlan, eth, 0); 200 goto out; 201 } 202 203 return RX_HANDLER_PASS; 204 } 205 206 if (port->passthru) 207 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list); 208 else 209 vlan = macvlan_hash_lookup(port, eth->h_dest); 210 if (vlan == NULL) 211 return RX_HANDLER_PASS; 212 213 dev = vlan->dev; 214 if (unlikely(!(dev->flags & IFF_UP))) { 215 kfree_skb(skb); 216 return RX_HANDLER_CONSUMED; 217 } 218 len = skb->len + ETH_HLEN; 219 skb = skb_share_check(skb, GFP_ATOMIC); 220 if (!skb) 221 goto out; 222 223 skb->dev = dev; 224 skb->pkt_type = PACKET_HOST; 225 226 ret = vlan->receive(skb); 227 228 out: 229 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); 230 return RX_HANDLER_CONSUMED; 231 } 232 233 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 234 { 235 const struct macvlan_dev *vlan = netdev_priv(dev); 236 const struct macvlan_port *port = vlan->port; 237 const struct macvlan_dev *dest; 238 __u8 ip_summed = skb->ip_summed; 239 240 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 241 const struct ethhdr *eth = (void *)skb->data; 242 skb->ip_summed = CHECKSUM_UNNECESSARY; 243 244 /* send to other bridge ports directly */ 245 if (is_multicast_ether_addr(eth->h_dest)) { 246 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 247 goto xmit_world; 248 } 249 250 dest = macvlan_hash_lookup(port, eth->h_dest); 251 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 252 /* send to lowerdev first for its network taps */ 253 dev_forward_skb(vlan->lowerdev, skb); 254 255 return NET_XMIT_SUCCESS; 256 } 257 } 258 259 xmit_world: 260 skb->ip_summed = ip_summed; 261 skb->dev = vlan->lowerdev; 262 return dev_queue_xmit(skb); 263 } 264 265 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 266 struct net_device *dev) 267 { 268 unsigned int len = skb->len; 269 int ret; 270 const struct macvlan_dev *vlan = netdev_priv(dev); 271 272 ret = macvlan_queue_xmit(skb, dev); 273 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 274 struct macvlan_pcpu_stats *pcpu_stats; 275 276 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 277 u64_stats_update_begin(&pcpu_stats->syncp); 278 pcpu_stats->tx_packets++; 279 pcpu_stats->tx_bytes += len; 280 u64_stats_update_end(&pcpu_stats->syncp); 281 } else { 282 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 283 } 284 return ret; 285 } 286 EXPORT_SYMBOL_GPL(macvlan_start_xmit); 287 288 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 289 unsigned short type, const void *daddr, 290 const void *saddr, unsigned len) 291 { 292 const struct macvlan_dev *vlan = netdev_priv(dev); 293 struct net_device *lowerdev = vlan->lowerdev; 294 295 return dev_hard_header(skb, lowerdev, type, daddr, 296 saddr ? : dev->dev_addr, len); 297 } 298 299 static const struct header_ops macvlan_hard_header_ops = { 300 .create = macvlan_hard_header, 301 .rebuild = eth_rebuild_header, 302 .parse = eth_header_parse, 303 .cache = eth_header_cache, 304 .cache_update = eth_header_cache_update, 305 }; 306 307 static int macvlan_open(struct net_device *dev) 308 { 309 struct macvlan_dev *vlan = netdev_priv(dev); 310 struct net_device *lowerdev = vlan->lowerdev; 311 int err; 312 313 if (vlan->port->passthru) { 314 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 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 dev_uc_unsync(lowerdev, dev); 348 dev_mc_unsync(lowerdev, dev); 349 350 if (vlan->port->passthru) { 351 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 352 dev_set_promiscuity(lowerdev, -1); 353 goto hash_del; 354 } 355 356 if (dev->flags & IFF_ALLMULTI) 357 dev_set_allmulti(lowerdev, -1); 358 359 dev_uc_del(lowerdev, dev->dev_addr); 360 361 hash_del: 362 macvlan_hash_del(vlan, !dev->dismantle); 363 return 0; 364 } 365 366 static int macvlan_set_mac_address(struct net_device *dev, void *p) 367 { 368 struct macvlan_dev *vlan = netdev_priv(dev); 369 struct net_device *lowerdev = vlan->lowerdev; 370 struct sockaddr *addr = p; 371 int err; 372 373 if (!is_valid_ether_addr(addr->sa_data)) 374 return -EADDRNOTAVAIL; 375 376 if (!(dev->flags & IFF_UP)) { 377 /* Just copy in the new address */ 378 dev->addr_assign_type &= ~NET_ADDR_RANDOM; 379 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 380 } else { 381 /* Rehash and update the device filters */ 382 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 383 return -EBUSY; 384 385 err = dev_uc_add(lowerdev, addr->sa_data); 386 if (err) 387 return err; 388 389 dev_uc_del(lowerdev, dev->dev_addr); 390 391 macvlan_hash_change_addr(vlan, addr->sa_data); 392 } 393 return 0; 394 } 395 396 static void macvlan_change_rx_flags(struct net_device *dev, int change) 397 { 398 struct macvlan_dev *vlan = netdev_priv(dev); 399 struct net_device *lowerdev = vlan->lowerdev; 400 401 if (change & IFF_ALLMULTI) 402 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 403 } 404 405 static void macvlan_set_mac_lists(struct net_device *dev) 406 { 407 struct macvlan_dev *vlan = netdev_priv(dev); 408 409 dev_uc_sync(vlan->lowerdev, dev); 410 dev_mc_sync(vlan->lowerdev, dev); 411 } 412 413 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 414 { 415 struct macvlan_dev *vlan = netdev_priv(dev); 416 417 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 418 return -EINVAL; 419 dev->mtu = new_mtu; 420 return 0; 421 } 422 423 /* 424 * macvlan network devices have devices nesting below it and are a special 425 * "super class" of normal network devices; split their locks off into a 426 * separate class since they always nest. 427 */ 428 static struct lock_class_key macvlan_netdev_xmit_lock_key; 429 static struct lock_class_key macvlan_netdev_addr_lock_key; 430 431 #define MACVLAN_FEATURES \ 432 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 433 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 434 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 435 NETIF_F_HW_VLAN_FILTER) 436 437 #define MACVLAN_STATE_MASK \ 438 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 439 440 static void macvlan_set_lockdep_class_one(struct net_device *dev, 441 struct netdev_queue *txq, 442 void *_unused) 443 { 444 lockdep_set_class(&txq->_xmit_lock, 445 &macvlan_netdev_xmit_lock_key); 446 } 447 448 static void macvlan_set_lockdep_class(struct net_device *dev) 449 { 450 lockdep_set_class(&dev->addr_list_lock, 451 &macvlan_netdev_addr_lock_key); 452 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 453 } 454 455 static int macvlan_init(struct net_device *dev) 456 { 457 struct macvlan_dev *vlan = netdev_priv(dev); 458 const struct net_device *lowerdev = vlan->lowerdev; 459 460 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 461 (lowerdev->state & MACVLAN_STATE_MASK); 462 dev->features = lowerdev->features & MACVLAN_FEATURES; 463 dev->features |= NETIF_F_LLTX; 464 dev->gso_max_size = lowerdev->gso_max_size; 465 dev->iflink = lowerdev->ifindex; 466 dev->hard_header_len = lowerdev->hard_header_len; 467 468 macvlan_set_lockdep_class(dev); 469 470 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats); 471 if (!vlan->pcpu_stats) 472 return -ENOMEM; 473 474 return 0; 475 } 476 477 static void macvlan_uninit(struct net_device *dev) 478 { 479 struct macvlan_dev *vlan = netdev_priv(dev); 480 struct macvlan_port *port = vlan->port; 481 482 free_percpu(vlan->pcpu_stats); 483 484 port->count -= 1; 485 if (!port->count) 486 macvlan_port_destroy(port->dev); 487 } 488 489 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 490 struct rtnl_link_stats64 *stats) 491 { 492 struct macvlan_dev *vlan = netdev_priv(dev); 493 494 if (vlan->pcpu_stats) { 495 struct macvlan_pcpu_stats *p; 496 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 497 u32 rx_errors = 0, tx_dropped = 0; 498 unsigned int start; 499 int i; 500 501 for_each_possible_cpu(i) { 502 p = per_cpu_ptr(vlan->pcpu_stats, i); 503 do { 504 start = u64_stats_fetch_begin_bh(&p->syncp); 505 rx_packets = p->rx_packets; 506 rx_bytes = p->rx_bytes; 507 rx_multicast = p->rx_multicast; 508 tx_packets = p->tx_packets; 509 tx_bytes = p->tx_bytes; 510 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 511 512 stats->rx_packets += rx_packets; 513 stats->rx_bytes += rx_bytes; 514 stats->multicast += rx_multicast; 515 stats->tx_packets += tx_packets; 516 stats->tx_bytes += tx_bytes; 517 /* rx_errors & tx_dropped are u32, updated 518 * without syncp protection. 519 */ 520 rx_errors += p->rx_errors; 521 tx_dropped += p->tx_dropped; 522 } 523 stats->rx_errors = rx_errors; 524 stats->rx_dropped = rx_errors; 525 stats->tx_dropped = tx_dropped; 526 } 527 return stats; 528 } 529 530 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 531 unsigned short vid) 532 { 533 struct macvlan_dev *vlan = netdev_priv(dev); 534 struct net_device *lowerdev = vlan->lowerdev; 535 536 return vlan_vid_add(lowerdev, vid); 537 } 538 539 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 540 unsigned short vid) 541 { 542 struct macvlan_dev *vlan = netdev_priv(dev); 543 struct net_device *lowerdev = vlan->lowerdev; 544 545 vlan_vid_del(lowerdev, vid); 546 return 0; 547 } 548 549 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 550 struct net_device *dev, 551 const unsigned char *addr, 552 u16 flags) 553 { 554 struct macvlan_dev *vlan = netdev_priv(dev); 555 int err = -EINVAL; 556 557 if (!vlan->port->passthru) 558 return -EOPNOTSUPP; 559 560 if (is_unicast_ether_addr(addr)) 561 err = dev_uc_add_excl(dev, addr); 562 else if (is_multicast_ether_addr(addr)) 563 err = dev_mc_add_excl(dev, addr); 564 565 return err; 566 } 567 568 static int macvlan_fdb_del(struct ndmsg *ndm, 569 struct net_device *dev, 570 const unsigned char *addr) 571 { 572 struct macvlan_dev *vlan = netdev_priv(dev); 573 int err = -EINVAL; 574 575 if (!vlan->port->passthru) 576 return -EOPNOTSUPP; 577 578 if (is_unicast_ether_addr(addr)) 579 err = dev_uc_del(dev, addr); 580 else if (is_multicast_ether_addr(addr)) 581 err = dev_mc_del(dev, addr); 582 583 return err; 584 } 585 586 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 587 struct ethtool_drvinfo *drvinfo) 588 { 589 snprintf(drvinfo->driver, 32, "macvlan"); 590 snprintf(drvinfo->version, 32, "0.1"); 591 } 592 593 static int macvlan_ethtool_get_settings(struct net_device *dev, 594 struct ethtool_cmd *cmd) 595 { 596 const struct macvlan_dev *vlan = netdev_priv(dev); 597 598 return __ethtool_get_settings(vlan->lowerdev, cmd); 599 } 600 601 static const struct ethtool_ops macvlan_ethtool_ops = { 602 .get_link = ethtool_op_get_link, 603 .get_settings = macvlan_ethtool_get_settings, 604 .get_drvinfo = macvlan_ethtool_get_drvinfo, 605 }; 606 607 static const struct net_device_ops macvlan_netdev_ops = { 608 .ndo_init = macvlan_init, 609 .ndo_uninit = macvlan_uninit, 610 .ndo_open = macvlan_open, 611 .ndo_stop = macvlan_stop, 612 .ndo_start_xmit = macvlan_start_xmit, 613 .ndo_change_mtu = macvlan_change_mtu, 614 .ndo_change_rx_flags = macvlan_change_rx_flags, 615 .ndo_set_mac_address = macvlan_set_mac_address, 616 .ndo_set_rx_mode = macvlan_set_mac_lists, 617 .ndo_get_stats64 = macvlan_dev_get_stats64, 618 .ndo_validate_addr = eth_validate_addr, 619 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 620 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 621 .ndo_fdb_add = macvlan_fdb_add, 622 .ndo_fdb_del = macvlan_fdb_del, 623 .ndo_fdb_dump = ndo_dflt_fdb_dump, 624 }; 625 626 void macvlan_common_setup(struct net_device *dev) 627 { 628 ether_setup(dev); 629 630 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 631 dev->netdev_ops = &macvlan_netdev_ops; 632 dev->destructor = free_netdev; 633 dev->header_ops = &macvlan_hard_header_ops, 634 dev->ethtool_ops = &macvlan_ethtool_ops; 635 } 636 EXPORT_SYMBOL_GPL(macvlan_common_setup); 637 638 static void macvlan_setup(struct net_device *dev) 639 { 640 macvlan_common_setup(dev); 641 dev->tx_queue_len = 0; 642 } 643 644 static int macvlan_port_create(struct net_device *dev) 645 { 646 struct macvlan_port *port; 647 unsigned int i; 648 int err; 649 650 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 651 return -EINVAL; 652 653 port = kzalloc(sizeof(*port), GFP_KERNEL); 654 if (port == NULL) 655 return -ENOMEM; 656 657 port->passthru = false; 658 port->dev = dev; 659 INIT_LIST_HEAD(&port->vlans); 660 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 661 INIT_HLIST_HEAD(&port->vlan_hash[i]); 662 663 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 664 if (err) 665 kfree(port); 666 else 667 dev->priv_flags |= IFF_MACVLAN_PORT; 668 return err; 669 } 670 671 static void macvlan_port_destroy(struct net_device *dev) 672 { 673 struct macvlan_port *port = macvlan_port_get(dev); 674 675 dev->priv_flags &= ~IFF_MACVLAN_PORT; 676 netdev_rx_handler_unregister(dev); 677 kfree_rcu(port, rcu); 678 } 679 680 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 681 { 682 if (tb[IFLA_ADDRESS]) { 683 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 684 return -EINVAL; 685 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 686 return -EADDRNOTAVAIL; 687 } 688 689 if (data && data[IFLA_MACVLAN_MODE]) { 690 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 691 case MACVLAN_MODE_PRIVATE: 692 case MACVLAN_MODE_VEPA: 693 case MACVLAN_MODE_BRIDGE: 694 case MACVLAN_MODE_PASSTHRU: 695 break; 696 default: 697 return -EINVAL; 698 } 699 } 700 return 0; 701 } 702 703 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 704 struct nlattr *tb[], struct nlattr *data[], 705 int (*receive)(struct sk_buff *skb), 706 int (*forward)(struct net_device *dev, 707 struct sk_buff *skb)) 708 { 709 struct macvlan_dev *vlan = netdev_priv(dev); 710 struct macvlan_port *port; 711 struct net_device *lowerdev; 712 int err; 713 714 if (!tb[IFLA_LINK]) 715 return -EINVAL; 716 717 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 718 if (lowerdev == NULL) 719 return -ENODEV; 720 721 /* When creating macvlans on top of other macvlans - use 722 * the real device as the lowerdev. 723 */ 724 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { 725 struct macvlan_dev *lowervlan = netdev_priv(lowerdev); 726 lowerdev = lowervlan->lowerdev; 727 } 728 729 if (!tb[IFLA_MTU]) 730 dev->mtu = lowerdev->mtu; 731 else if (dev->mtu > lowerdev->mtu) 732 return -EINVAL; 733 734 if (!tb[IFLA_ADDRESS]) 735 eth_hw_addr_random(dev); 736 737 if (!macvlan_port_exists(lowerdev)) { 738 err = macvlan_port_create(lowerdev); 739 if (err < 0) 740 return err; 741 } 742 port = macvlan_port_get(lowerdev); 743 744 /* Only 1 macvlan device can be created in passthru mode */ 745 if (port->passthru) 746 return -EINVAL; 747 748 vlan->lowerdev = lowerdev; 749 vlan->dev = dev; 750 vlan->port = port; 751 vlan->receive = receive; 752 vlan->forward = forward; 753 754 vlan->mode = MACVLAN_MODE_VEPA; 755 if (data && data[IFLA_MACVLAN_MODE]) 756 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 757 758 if (data && data[IFLA_MACVLAN_FLAGS]) 759 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 760 761 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 762 if (port->count) 763 return -EINVAL; 764 port->passthru = true; 765 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN); 766 } 767 768 port->count += 1; 769 err = register_netdevice(dev); 770 if (err < 0) 771 goto destroy_port; 772 773 list_add_tail(&vlan->list, &port->vlans); 774 netif_stacked_transfer_operstate(lowerdev, dev); 775 776 return 0; 777 778 destroy_port: 779 port->count -= 1; 780 if (!port->count) 781 macvlan_port_destroy(lowerdev); 782 783 return err; 784 } 785 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 786 787 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 788 struct nlattr *tb[], struct nlattr *data[]) 789 { 790 return macvlan_common_newlink(src_net, dev, tb, data, 791 netif_rx, 792 dev_forward_skb); 793 } 794 795 void macvlan_dellink(struct net_device *dev, struct list_head *head) 796 { 797 struct macvlan_dev *vlan = netdev_priv(dev); 798 799 list_del(&vlan->list); 800 unregister_netdevice_queue(dev, head); 801 } 802 EXPORT_SYMBOL_GPL(macvlan_dellink); 803 804 static int macvlan_changelink(struct net_device *dev, 805 struct nlattr *tb[], struct nlattr *data[]) 806 { 807 struct macvlan_dev *vlan = netdev_priv(dev); 808 if (data && data[IFLA_MACVLAN_MODE]) 809 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 810 if (data && data[IFLA_MACVLAN_FLAGS]) { 811 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 812 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 813 814 if (promisc && (flags & MACVLAN_FLAG_NOPROMISC)) 815 dev_set_promiscuity(vlan->lowerdev, -1); 816 else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC)) 817 dev_set_promiscuity(vlan->lowerdev, 1); 818 vlan->flags = flags; 819 } 820 return 0; 821 } 822 823 static size_t macvlan_get_size(const struct net_device *dev) 824 { 825 return nla_total_size(4); 826 } 827 828 static int macvlan_fill_info(struct sk_buff *skb, 829 const struct net_device *dev) 830 { 831 struct macvlan_dev *vlan = netdev_priv(dev); 832 833 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 834 goto nla_put_failure; 835 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 836 goto nla_put_failure; 837 return 0; 838 839 nla_put_failure: 840 return -EMSGSIZE; 841 } 842 843 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 844 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 845 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 846 }; 847 848 int macvlan_link_register(struct rtnl_link_ops *ops) 849 { 850 /* common fields */ 851 ops->priv_size = sizeof(struct macvlan_dev); 852 ops->validate = macvlan_validate; 853 ops->maxtype = IFLA_MACVLAN_MAX; 854 ops->policy = macvlan_policy; 855 ops->changelink = macvlan_changelink; 856 ops->get_size = macvlan_get_size; 857 ops->fill_info = macvlan_fill_info; 858 859 return rtnl_link_register(ops); 860 }; 861 EXPORT_SYMBOL_GPL(macvlan_link_register); 862 863 static struct rtnl_link_ops macvlan_link_ops = { 864 .kind = "macvlan", 865 .setup = macvlan_setup, 866 .newlink = macvlan_newlink, 867 .dellink = macvlan_dellink, 868 }; 869 870 static int macvlan_device_event(struct notifier_block *unused, 871 unsigned long event, void *ptr) 872 { 873 struct net_device *dev = ptr; 874 struct macvlan_dev *vlan, *next; 875 struct macvlan_port *port; 876 LIST_HEAD(list_kill); 877 878 if (!macvlan_port_exists(dev)) 879 return NOTIFY_DONE; 880 881 port = macvlan_port_get(dev); 882 883 switch (event) { 884 case NETDEV_CHANGE: 885 list_for_each_entry(vlan, &port->vlans, list) 886 netif_stacked_transfer_operstate(vlan->lowerdev, 887 vlan->dev); 888 break; 889 case NETDEV_FEAT_CHANGE: 890 list_for_each_entry(vlan, &port->vlans, list) { 891 vlan->dev->features = dev->features & MACVLAN_FEATURES; 892 vlan->dev->gso_max_size = dev->gso_max_size; 893 netdev_features_change(vlan->dev); 894 } 895 break; 896 case NETDEV_UNREGISTER: 897 /* twiddle thumbs on netns device moves */ 898 if (dev->reg_state != NETREG_UNREGISTERING) 899 break; 900 901 list_for_each_entry_safe(vlan, next, &port->vlans, list) 902 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 903 unregister_netdevice_many(&list_kill); 904 list_del(&list_kill); 905 break; 906 case NETDEV_PRE_TYPE_CHANGE: 907 /* Forbid underlaying device to change its type. */ 908 return NOTIFY_BAD; 909 } 910 return NOTIFY_DONE; 911 } 912 913 static struct notifier_block macvlan_notifier_block __read_mostly = { 914 .notifier_call = macvlan_device_event, 915 }; 916 917 static int __init macvlan_init_module(void) 918 { 919 int err; 920 921 register_netdevice_notifier(&macvlan_notifier_block); 922 923 err = macvlan_link_register(&macvlan_link_ops); 924 if (err < 0) 925 goto err1; 926 return 0; 927 err1: 928 unregister_netdevice_notifier(&macvlan_notifier_block); 929 return err; 930 } 931 932 static void __exit macvlan_cleanup_module(void) 933 { 934 rtnl_link_unregister(&macvlan_link_ops); 935 unregister_netdevice_notifier(&macvlan_notifier_block); 936 } 937 938 module_init(macvlan_init_module); 939 module_exit(macvlan_cleanup_module); 940 941 MODULE_LICENSE("GPL"); 942 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 943 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 944 MODULE_ALIAS_RTNL_LINK("macvlan"); 945