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 <linux/hash.h> 33 #include <net/rtnetlink.h> 34 #include <net/xfrm.h> 35 36 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE) 37 38 struct macvlan_port { 39 struct net_device *dev; 40 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 41 struct list_head vlans; 42 struct rcu_head rcu; 43 bool passthru; 44 int count; 45 }; 46 47 static void macvlan_port_destroy(struct net_device *dev); 48 49 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 50 { 51 return rcu_dereference(dev->rx_handler_data); 52 } 53 54 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 55 { 56 return rtnl_dereference(dev->rx_handler_data); 57 } 58 59 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 60 61 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 62 const unsigned char *addr) 63 { 64 struct macvlan_dev *vlan; 65 66 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) { 67 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 68 return vlan; 69 } 70 return NULL; 71 } 72 73 static void macvlan_hash_add(struct macvlan_dev *vlan) 74 { 75 struct macvlan_port *port = vlan->port; 76 const unsigned char *addr = vlan->dev->dev_addr; 77 78 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); 79 } 80 81 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 82 { 83 hlist_del_rcu(&vlan->hlist); 84 if (sync) 85 synchronize_rcu(); 86 } 87 88 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 89 const unsigned char *addr) 90 { 91 macvlan_hash_del(vlan, true); 92 /* Now that we are unhashed it is safe to change the device 93 * address without confusing packet delivery. 94 */ 95 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 96 macvlan_hash_add(vlan); 97 } 98 99 static int macvlan_addr_busy(const struct macvlan_port *port, 100 const unsigned char *addr) 101 { 102 /* Test to see if the specified multicast address is 103 * currently in use by the underlying device or 104 * another macvlan. 105 */ 106 if (ether_addr_equal_64bits(port->dev->dev_addr, addr)) 107 return 1; 108 109 if (macvlan_hash_lookup(port, addr)) 110 return 1; 111 112 return 0; 113 } 114 115 116 static int macvlan_broadcast_one(struct sk_buff *skb, 117 const struct macvlan_dev *vlan, 118 const struct ethhdr *eth, bool local) 119 { 120 struct net_device *dev = vlan->dev; 121 if (!skb) 122 return NET_RX_DROP; 123 124 if (local) 125 return vlan->forward(dev, skb); 126 127 skb->dev = dev; 128 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 129 skb->pkt_type = PACKET_BROADCAST; 130 else 131 skb->pkt_type = PACKET_MULTICAST; 132 133 return vlan->receive(skb); 134 } 135 136 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 137 { 138 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 139 } 140 141 142 static unsigned int mc_hash(const struct macvlan_dev *vlan, 143 const unsigned char *addr) 144 { 145 u32 val = __get_unaligned_cpu32(addr + 2); 146 147 val ^= macvlan_hash_mix(vlan); 148 return hash_32(val, MACVLAN_MC_FILTER_BITS); 149 } 150 151 static void macvlan_broadcast(struct sk_buff *skb, 152 const struct macvlan_port *port, 153 struct net_device *src, 154 enum macvlan_mode mode) 155 { 156 const struct ethhdr *eth = eth_hdr(skb); 157 const struct macvlan_dev *vlan; 158 struct sk_buff *nskb; 159 unsigned int i; 160 int err; 161 unsigned int hash; 162 163 if (skb->protocol == htons(ETH_P_PAUSE)) 164 return; 165 166 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 167 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 168 if (vlan->dev == src || !(vlan->mode & mode)) 169 continue; 170 171 hash = mc_hash(vlan, eth->h_dest); 172 if (!test_bit(hash, vlan->mc_filter)) 173 continue; 174 nskb = skb_clone(skb, GFP_ATOMIC); 175 err = macvlan_broadcast_one(nskb, vlan, eth, 176 mode == MACVLAN_MODE_BRIDGE); 177 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 178 err == NET_RX_SUCCESS, 1); 179 } 180 } 181 } 182 183 /* called under rcu_read_lock() from netif_receive_skb */ 184 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 185 { 186 struct macvlan_port *port; 187 struct sk_buff *skb = *pskb; 188 const struct ethhdr *eth = eth_hdr(skb); 189 const struct macvlan_dev *vlan; 190 const struct macvlan_dev *src; 191 struct net_device *dev; 192 unsigned int len = 0; 193 int ret = NET_RX_DROP; 194 195 port = macvlan_port_get_rcu(skb->dev); 196 if (is_multicast_ether_addr(eth->h_dest)) { 197 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN); 198 if (!skb) 199 return RX_HANDLER_CONSUMED; 200 eth = eth_hdr(skb); 201 src = macvlan_hash_lookup(port, eth->h_source); 202 if (!src) 203 /* frame comes from an external address */ 204 macvlan_broadcast(skb, port, NULL, 205 MACVLAN_MODE_PRIVATE | 206 MACVLAN_MODE_VEPA | 207 MACVLAN_MODE_PASSTHRU| 208 MACVLAN_MODE_BRIDGE); 209 else if (src->mode == MACVLAN_MODE_VEPA) 210 /* flood to everyone except source */ 211 macvlan_broadcast(skb, port, src->dev, 212 MACVLAN_MODE_VEPA | 213 MACVLAN_MODE_BRIDGE); 214 else if (src->mode == MACVLAN_MODE_BRIDGE) 215 /* 216 * flood only to VEPA ports, bridge ports 217 * already saw the frame on the way out. 218 */ 219 macvlan_broadcast(skb, port, src->dev, 220 MACVLAN_MODE_VEPA); 221 else { 222 /* forward to original port. */ 223 vlan = src; 224 ret = macvlan_broadcast_one(skb, vlan, eth, 0); 225 goto out; 226 } 227 228 return RX_HANDLER_PASS; 229 } 230 231 if (port->passthru) 232 vlan = list_first_or_null_rcu(&port->vlans, 233 struct macvlan_dev, list); 234 else 235 vlan = macvlan_hash_lookup(port, eth->h_dest); 236 if (vlan == NULL) 237 return RX_HANDLER_PASS; 238 239 dev = vlan->dev; 240 if (unlikely(!(dev->flags & IFF_UP))) { 241 kfree_skb(skb); 242 return RX_HANDLER_CONSUMED; 243 } 244 len = skb->len + ETH_HLEN; 245 skb = skb_share_check(skb, GFP_ATOMIC); 246 if (!skb) 247 goto out; 248 249 skb->dev = dev; 250 skb->pkt_type = PACKET_HOST; 251 252 ret = vlan->receive(skb); 253 254 out: 255 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); 256 return RX_HANDLER_CONSUMED; 257 } 258 259 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 260 { 261 const struct macvlan_dev *vlan = netdev_priv(dev); 262 const struct macvlan_port *port = vlan->port; 263 const struct macvlan_dev *dest; 264 __u8 ip_summed = skb->ip_summed; 265 266 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 267 const struct ethhdr *eth = (void *)skb->data; 268 skb->ip_summed = CHECKSUM_UNNECESSARY; 269 270 /* send to other bridge ports directly */ 271 if (is_multicast_ether_addr(eth->h_dest)) { 272 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 273 goto xmit_world; 274 } 275 276 dest = macvlan_hash_lookup(port, eth->h_dest); 277 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 278 /* send to lowerdev first for its network taps */ 279 dev_forward_skb(vlan->lowerdev, skb); 280 281 return NET_XMIT_SUCCESS; 282 } 283 } 284 285 xmit_world: 286 skb->ip_summed = ip_summed; 287 skb->dev = vlan->lowerdev; 288 return dev_queue_xmit(skb); 289 } 290 291 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 292 struct net_device *dev) 293 { 294 unsigned int len = skb->len; 295 int ret; 296 const struct macvlan_dev *vlan = netdev_priv(dev); 297 298 ret = macvlan_queue_xmit(skb, dev); 299 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 300 struct macvlan_pcpu_stats *pcpu_stats; 301 302 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 303 u64_stats_update_begin(&pcpu_stats->syncp); 304 pcpu_stats->tx_packets++; 305 pcpu_stats->tx_bytes += len; 306 u64_stats_update_end(&pcpu_stats->syncp); 307 } else { 308 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 309 } 310 return ret; 311 } 312 EXPORT_SYMBOL_GPL(macvlan_start_xmit); 313 314 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 315 unsigned short type, const void *daddr, 316 const void *saddr, unsigned len) 317 { 318 const struct macvlan_dev *vlan = netdev_priv(dev); 319 struct net_device *lowerdev = vlan->lowerdev; 320 321 return dev_hard_header(skb, lowerdev, type, daddr, 322 saddr ? : dev->dev_addr, len); 323 } 324 325 static const struct header_ops macvlan_hard_header_ops = { 326 .create = macvlan_hard_header, 327 .rebuild = eth_rebuild_header, 328 .parse = eth_header_parse, 329 .cache = eth_header_cache, 330 .cache_update = eth_header_cache_update, 331 }; 332 333 static int macvlan_open(struct net_device *dev) 334 { 335 struct macvlan_dev *vlan = netdev_priv(dev); 336 struct net_device *lowerdev = vlan->lowerdev; 337 int err; 338 339 if (vlan->port->passthru) { 340 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 341 dev_set_promiscuity(lowerdev, 1); 342 goto hash_add; 343 } 344 345 err = -EBUSY; 346 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 347 goto out; 348 349 err = dev_uc_add(lowerdev, dev->dev_addr); 350 if (err < 0) 351 goto out; 352 if (dev->flags & IFF_ALLMULTI) { 353 err = dev_set_allmulti(lowerdev, 1); 354 if (err < 0) 355 goto del_unicast; 356 } 357 358 hash_add: 359 macvlan_hash_add(vlan); 360 return 0; 361 362 del_unicast: 363 dev_uc_del(lowerdev, dev->dev_addr); 364 out: 365 return err; 366 } 367 368 static int macvlan_stop(struct net_device *dev) 369 { 370 struct macvlan_dev *vlan = netdev_priv(dev); 371 struct net_device *lowerdev = vlan->lowerdev; 372 373 dev_uc_unsync(lowerdev, dev); 374 dev_mc_unsync(lowerdev, dev); 375 376 if (vlan->port->passthru) { 377 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 378 dev_set_promiscuity(lowerdev, -1); 379 goto hash_del; 380 } 381 382 if (dev->flags & IFF_ALLMULTI) 383 dev_set_allmulti(lowerdev, -1); 384 385 dev_uc_del(lowerdev, dev->dev_addr); 386 387 hash_del: 388 macvlan_hash_del(vlan, !dev->dismantle); 389 return 0; 390 } 391 392 static int macvlan_set_mac_address(struct net_device *dev, void *p) 393 { 394 struct macvlan_dev *vlan = netdev_priv(dev); 395 struct net_device *lowerdev = vlan->lowerdev; 396 struct sockaddr *addr = p; 397 int err; 398 399 if (!is_valid_ether_addr(addr->sa_data)) 400 return -EADDRNOTAVAIL; 401 402 if (!(dev->flags & IFF_UP)) { 403 /* Just copy in the new address */ 404 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 405 } else { 406 /* Rehash and update the device filters */ 407 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 408 return -EBUSY; 409 410 err = dev_uc_add(lowerdev, addr->sa_data); 411 if (err) 412 return err; 413 414 dev_uc_del(lowerdev, dev->dev_addr); 415 416 macvlan_hash_change_addr(vlan, addr->sa_data); 417 } 418 return 0; 419 } 420 421 static void macvlan_change_rx_flags(struct net_device *dev, int change) 422 { 423 struct macvlan_dev *vlan = netdev_priv(dev); 424 struct net_device *lowerdev = vlan->lowerdev; 425 426 if (change & IFF_ALLMULTI) 427 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 428 } 429 430 static void macvlan_set_mac_lists(struct net_device *dev) 431 { 432 struct macvlan_dev *vlan = netdev_priv(dev); 433 434 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 435 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); 436 } else { 437 struct netdev_hw_addr *ha; 438 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 439 440 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 441 netdev_for_each_mc_addr(ha, dev) { 442 __set_bit(mc_hash(vlan, ha->addr), filter); 443 } 444 445 __set_bit(mc_hash(vlan, dev->broadcast), filter); 446 447 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); 448 } 449 dev_uc_sync(vlan->lowerdev, dev); 450 dev_mc_sync(vlan->lowerdev, dev); 451 } 452 453 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 454 { 455 struct macvlan_dev *vlan = netdev_priv(dev); 456 457 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 458 return -EINVAL; 459 dev->mtu = new_mtu; 460 return 0; 461 } 462 463 /* 464 * macvlan network devices have devices nesting below it and are a special 465 * "super class" of normal network devices; split their locks off into a 466 * separate class since they always nest. 467 */ 468 static struct lock_class_key macvlan_netdev_xmit_lock_key; 469 static struct lock_class_key macvlan_netdev_addr_lock_key; 470 471 #define MACVLAN_FEATURES \ 472 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 473 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 474 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 475 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 476 477 #define MACVLAN_STATE_MASK \ 478 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 479 480 static void macvlan_set_lockdep_class_one(struct net_device *dev, 481 struct netdev_queue *txq, 482 void *_unused) 483 { 484 lockdep_set_class(&txq->_xmit_lock, 485 &macvlan_netdev_xmit_lock_key); 486 } 487 488 static void macvlan_set_lockdep_class(struct net_device *dev) 489 { 490 lockdep_set_class(&dev->addr_list_lock, 491 &macvlan_netdev_addr_lock_key); 492 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 493 } 494 495 static int macvlan_init(struct net_device *dev) 496 { 497 struct macvlan_dev *vlan = netdev_priv(dev); 498 const struct net_device *lowerdev = vlan->lowerdev; 499 500 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 501 (lowerdev->state & MACVLAN_STATE_MASK); 502 dev->features = lowerdev->features & MACVLAN_FEATURES; 503 dev->features |= NETIF_F_LLTX; 504 dev->gso_max_size = lowerdev->gso_max_size; 505 dev->iflink = lowerdev->ifindex; 506 dev->hard_header_len = lowerdev->hard_header_len; 507 508 macvlan_set_lockdep_class(dev); 509 510 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats); 511 if (!vlan->pcpu_stats) 512 return -ENOMEM; 513 514 return 0; 515 } 516 517 static void macvlan_uninit(struct net_device *dev) 518 { 519 struct macvlan_dev *vlan = netdev_priv(dev); 520 struct macvlan_port *port = vlan->port; 521 522 free_percpu(vlan->pcpu_stats); 523 524 port->count -= 1; 525 if (!port->count) 526 macvlan_port_destroy(port->dev); 527 } 528 529 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 530 struct rtnl_link_stats64 *stats) 531 { 532 struct macvlan_dev *vlan = netdev_priv(dev); 533 534 if (vlan->pcpu_stats) { 535 struct macvlan_pcpu_stats *p; 536 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 537 u32 rx_errors = 0, tx_dropped = 0; 538 unsigned int start; 539 int i; 540 541 for_each_possible_cpu(i) { 542 p = per_cpu_ptr(vlan->pcpu_stats, i); 543 do { 544 start = u64_stats_fetch_begin_bh(&p->syncp); 545 rx_packets = p->rx_packets; 546 rx_bytes = p->rx_bytes; 547 rx_multicast = p->rx_multicast; 548 tx_packets = p->tx_packets; 549 tx_bytes = p->tx_bytes; 550 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 551 552 stats->rx_packets += rx_packets; 553 stats->rx_bytes += rx_bytes; 554 stats->multicast += rx_multicast; 555 stats->tx_packets += tx_packets; 556 stats->tx_bytes += tx_bytes; 557 /* rx_errors & tx_dropped are u32, updated 558 * without syncp protection. 559 */ 560 rx_errors += p->rx_errors; 561 tx_dropped += p->tx_dropped; 562 } 563 stats->rx_errors = rx_errors; 564 stats->rx_dropped = rx_errors; 565 stats->tx_dropped = tx_dropped; 566 } 567 return stats; 568 } 569 570 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 571 __be16 proto, u16 vid) 572 { 573 struct macvlan_dev *vlan = netdev_priv(dev); 574 struct net_device *lowerdev = vlan->lowerdev; 575 576 return vlan_vid_add(lowerdev, proto, vid); 577 } 578 579 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 580 __be16 proto, u16 vid) 581 { 582 struct macvlan_dev *vlan = netdev_priv(dev); 583 struct net_device *lowerdev = vlan->lowerdev; 584 585 vlan_vid_del(lowerdev, proto, vid); 586 return 0; 587 } 588 589 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 590 struct net_device *dev, 591 const unsigned char *addr, 592 u16 flags) 593 { 594 struct macvlan_dev *vlan = netdev_priv(dev); 595 int err = -EINVAL; 596 597 if (!vlan->port->passthru) 598 return -EOPNOTSUPP; 599 600 if (is_unicast_ether_addr(addr)) 601 err = dev_uc_add_excl(dev, addr); 602 else if (is_multicast_ether_addr(addr)) 603 err = dev_mc_add_excl(dev, addr); 604 605 return err; 606 } 607 608 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 609 struct net_device *dev, 610 const unsigned char *addr) 611 { 612 struct macvlan_dev *vlan = netdev_priv(dev); 613 int err = -EINVAL; 614 615 if (!vlan->port->passthru) 616 return -EOPNOTSUPP; 617 618 if (is_unicast_ether_addr(addr)) 619 err = dev_uc_del(dev, addr); 620 else if (is_multicast_ether_addr(addr)) 621 err = dev_mc_del(dev, addr); 622 623 return err; 624 } 625 626 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 627 struct ethtool_drvinfo *drvinfo) 628 { 629 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 630 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 631 } 632 633 static int macvlan_ethtool_get_settings(struct net_device *dev, 634 struct ethtool_cmd *cmd) 635 { 636 const struct macvlan_dev *vlan = netdev_priv(dev); 637 638 return __ethtool_get_settings(vlan->lowerdev, cmd); 639 } 640 641 static netdev_features_t macvlan_fix_features(struct net_device *dev, 642 netdev_features_t features) 643 { 644 struct macvlan_dev *vlan = netdev_priv(dev); 645 646 return features & (vlan->set_features | ~MACVLAN_FEATURES); 647 } 648 649 static const struct ethtool_ops macvlan_ethtool_ops = { 650 .get_link = ethtool_op_get_link, 651 .get_settings = macvlan_ethtool_get_settings, 652 .get_drvinfo = macvlan_ethtool_get_drvinfo, 653 }; 654 655 static const struct net_device_ops macvlan_netdev_ops = { 656 .ndo_init = macvlan_init, 657 .ndo_uninit = macvlan_uninit, 658 .ndo_open = macvlan_open, 659 .ndo_stop = macvlan_stop, 660 .ndo_start_xmit = macvlan_start_xmit, 661 .ndo_change_mtu = macvlan_change_mtu, 662 .ndo_fix_features = macvlan_fix_features, 663 .ndo_change_rx_flags = macvlan_change_rx_flags, 664 .ndo_set_mac_address = macvlan_set_mac_address, 665 .ndo_set_rx_mode = macvlan_set_mac_lists, 666 .ndo_get_stats64 = macvlan_dev_get_stats64, 667 .ndo_validate_addr = eth_validate_addr, 668 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 669 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 670 .ndo_fdb_add = macvlan_fdb_add, 671 .ndo_fdb_del = macvlan_fdb_del, 672 .ndo_fdb_dump = ndo_dflt_fdb_dump, 673 }; 674 675 void macvlan_common_setup(struct net_device *dev) 676 { 677 ether_setup(dev); 678 679 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 680 dev->priv_flags |= IFF_UNICAST_FLT; 681 dev->netdev_ops = &macvlan_netdev_ops; 682 dev->destructor = free_netdev; 683 dev->header_ops = &macvlan_hard_header_ops, 684 dev->ethtool_ops = &macvlan_ethtool_ops; 685 } 686 EXPORT_SYMBOL_GPL(macvlan_common_setup); 687 688 static void macvlan_setup(struct net_device *dev) 689 { 690 macvlan_common_setup(dev); 691 dev->tx_queue_len = 0; 692 } 693 694 static int macvlan_port_create(struct net_device *dev) 695 { 696 struct macvlan_port *port; 697 unsigned int i; 698 int err; 699 700 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 701 return -EINVAL; 702 703 port = kzalloc(sizeof(*port), GFP_KERNEL); 704 if (port == NULL) 705 return -ENOMEM; 706 707 port->passthru = false; 708 port->dev = dev; 709 INIT_LIST_HEAD(&port->vlans); 710 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 711 INIT_HLIST_HEAD(&port->vlan_hash[i]); 712 713 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 714 if (err) 715 kfree(port); 716 else 717 dev->priv_flags |= IFF_MACVLAN_PORT; 718 return err; 719 } 720 721 static void macvlan_port_destroy(struct net_device *dev) 722 { 723 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 724 725 dev->priv_flags &= ~IFF_MACVLAN_PORT; 726 netdev_rx_handler_unregister(dev); 727 kfree_rcu(port, rcu); 728 } 729 730 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 731 { 732 if (tb[IFLA_ADDRESS]) { 733 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 734 return -EINVAL; 735 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 736 return -EADDRNOTAVAIL; 737 } 738 739 if (data && data[IFLA_MACVLAN_MODE]) { 740 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 741 case MACVLAN_MODE_PRIVATE: 742 case MACVLAN_MODE_VEPA: 743 case MACVLAN_MODE_BRIDGE: 744 case MACVLAN_MODE_PASSTHRU: 745 break; 746 default: 747 return -EINVAL; 748 } 749 } 750 return 0; 751 } 752 753 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 754 struct nlattr *tb[], struct nlattr *data[], 755 int (*receive)(struct sk_buff *skb), 756 int (*forward)(struct net_device *dev, 757 struct sk_buff *skb)) 758 { 759 struct macvlan_dev *vlan = netdev_priv(dev); 760 struct macvlan_port *port; 761 struct net_device *lowerdev; 762 int err; 763 764 if (!tb[IFLA_LINK]) 765 return -EINVAL; 766 767 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 768 if (lowerdev == NULL) 769 return -ENODEV; 770 771 /* When creating macvlans on top of other macvlans - use 772 * the real device as the lowerdev. 773 */ 774 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { 775 struct macvlan_dev *lowervlan = netdev_priv(lowerdev); 776 lowerdev = lowervlan->lowerdev; 777 } 778 779 if (!tb[IFLA_MTU]) 780 dev->mtu = lowerdev->mtu; 781 else if (dev->mtu > lowerdev->mtu) 782 return -EINVAL; 783 784 if (!tb[IFLA_ADDRESS]) 785 eth_hw_addr_random(dev); 786 787 if (!macvlan_port_exists(lowerdev)) { 788 err = macvlan_port_create(lowerdev); 789 if (err < 0) 790 return err; 791 } 792 port = macvlan_port_get_rtnl(lowerdev); 793 794 /* Only 1 macvlan device can be created in passthru mode */ 795 if (port->passthru) 796 return -EINVAL; 797 798 vlan->lowerdev = lowerdev; 799 vlan->dev = dev; 800 vlan->port = port; 801 vlan->receive = receive; 802 vlan->forward = forward; 803 vlan->set_features = MACVLAN_FEATURES; 804 805 vlan->mode = MACVLAN_MODE_VEPA; 806 if (data && data[IFLA_MACVLAN_MODE]) 807 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 808 809 if (data && data[IFLA_MACVLAN_FLAGS]) 810 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 811 812 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 813 if (port->count) 814 return -EINVAL; 815 port->passthru = true; 816 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN); 817 } 818 819 err = netdev_upper_dev_link(lowerdev, dev); 820 if (err) 821 goto destroy_port; 822 823 port->count += 1; 824 err = register_netdevice(dev); 825 if (err < 0) 826 goto upper_dev_unlink; 827 828 list_add_tail_rcu(&vlan->list, &port->vlans); 829 netif_stacked_transfer_operstate(lowerdev, dev); 830 831 return 0; 832 833 upper_dev_unlink: 834 netdev_upper_dev_unlink(lowerdev, dev); 835 destroy_port: 836 port->count -= 1; 837 if (!port->count) 838 macvlan_port_destroy(lowerdev); 839 840 return err; 841 } 842 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 843 844 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 845 struct nlattr *tb[], struct nlattr *data[]) 846 { 847 return macvlan_common_newlink(src_net, dev, tb, data, 848 netif_rx, 849 dev_forward_skb); 850 } 851 852 void macvlan_dellink(struct net_device *dev, struct list_head *head) 853 { 854 struct macvlan_dev *vlan = netdev_priv(dev); 855 856 list_del_rcu(&vlan->list); 857 unregister_netdevice_queue(dev, head); 858 netdev_upper_dev_unlink(vlan->lowerdev, dev); 859 } 860 EXPORT_SYMBOL_GPL(macvlan_dellink); 861 862 static int macvlan_changelink(struct net_device *dev, 863 struct nlattr *tb[], struct nlattr *data[]) 864 { 865 struct macvlan_dev *vlan = netdev_priv(dev); 866 867 if (data && data[IFLA_MACVLAN_FLAGS]) { 868 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 869 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 870 if (vlan->port->passthru && promisc) { 871 int err; 872 873 if (flags & MACVLAN_FLAG_NOPROMISC) 874 err = dev_set_promiscuity(vlan->lowerdev, -1); 875 else 876 err = dev_set_promiscuity(vlan->lowerdev, 1); 877 if (err < 0) 878 return err; 879 } 880 vlan->flags = flags; 881 } 882 if (data && data[IFLA_MACVLAN_MODE]) 883 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 884 return 0; 885 } 886 887 static size_t macvlan_get_size(const struct net_device *dev) 888 { 889 return (0 890 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 891 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 892 ); 893 } 894 895 static int macvlan_fill_info(struct sk_buff *skb, 896 const struct net_device *dev) 897 { 898 struct macvlan_dev *vlan = netdev_priv(dev); 899 900 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 901 goto nla_put_failure; 902 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 903 goto nla_put_failure; 904 return 0; 905 906 nla_put_failure: 907 return -EMSGSIZE; 908 } 909 910 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 911 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 912 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 913 }; 914 915 int macvlan_link_register(struct rtnl_link_ops *ops) 916 { 917 /* common fields */ 918 ops->priv_size = sizeof(struct macvlan_dev); 919 ops->validate = macvlan_validate; 920 ops->maxtype = IFLA_MACVLAN_MAX; 921 ops->policy = macvlan_policy; 922 ops->changelink = macvlan_changelink; 923 ops->get_size = macvlan_get_size; 924 ops->fill_info = macvlan_fill_info; 925 926 return rtnl_link_register(ops); 927 }; 928 EXPORT_SYMBOL_GPL(macvlan_link_register); 929 930 static struct rtnl_link_ops macvlan_link_ops = { 931 .kind = "macvlan", 932 .setup = macvlan_setup, 933 .newlink = macvlan_newlink, 934 .dellink = macvlan_dellink, 935 }; 936 937 static int macvlan_device_event(struct notifier_block *unused, 938 unsigned long event, void *ptr) 939 { 940 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 941 struct macvlan_dev *vlan, *next; 942 struct macvlan_port *port; 943 LIST_HEAD(list_kill); 944 945 if (!macvlan_port_exists(dev)) 946 return NOTIFY_DONE; 947 948 port = macvlan_port_get_rtnl(dev); 949 950 switch (event) { 951 case NETDEV_CHANGE: 952 list_for_each_entry(vlan, &port->vlans, list) 953 netif_stacked_transfer_operstate(vlan->lowerdev, 954 vlan->dev); 955 break; 956 case NETDEV_FEAT_CHANGE: 957 list_for_each_entry(vlan, &port->vlans, list) { 958 vlan->dev->features = dev->features & MACVLAN_FEATURES; 959 vlan->dev->gso_max_size = dev->gso_max_size; 960 netdev_features_change(vlan->dev); 961 } 962 break; 963 case NETDEV_UNREGISTER: 964 /* twiddle thumbs on netns device moves */ 965 if (dev->reg_state != NETREG_UNREGISTERING) 966 break; 967 968 list_for_each_entry_safe(vlan, next, &port->vlans, list) 969 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 970 unregister_netdevice_many(&list_kill); 971 list_del(&list_kill); 972 break; 973 case NETDEV_PRE_TYPE_CHANGE: 974 /* Forbid underlaying device to change its type. */ 975 return NOTIFY_BAD; 976 } 977 return NOTIFY_DONE; 978 } 979 980 static struct notifier_block macvlan_notifier_block __read_mostly = { 981 .notifier_call = macvlan_device_event, 982 }; 983 984 static int __init macvlan_init_module(void) 985 { 986 int err; 987 988 register_netdevice_notifier(&macvlan_notifier_block); 989 990 err = macvlan_link_register(&macvlan_link_ops); 991 if (err < 0) 992 goto err1; 993 return 0; 994 err1: 995 unregister_netdevice_notifier(&macvlan_notifier_block); 996 return err; 997 } 998 999 static void __exit macvlan_cleanup_module(void) 1000 { 1001 rtnl_link_unregister(&macvlan_link_ops); 1002 unregister_netdevice_notifier(&macvlan_notifier_block); 1003 } 1004 1005 module_init(macvlan_init_module); 1006 module_exit(macvlan_cleanup_module); 1007 1008 MODULE_LICENSE("GPL"); 1009 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1010 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1011 MODULE_ALIAS_RTNL_LINK("macvlan"); 1012