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 err = dev_set_promiscuity(lowerdev, 1); 342 if (err < 0) 343 goto out; 344 } 345 goto hash_add; 346 } 347 348 err = -EBUSY; 349 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 350 goto out; 351 352 err = dev_uc_add(lowerdev, dev->dev_addr); 353 if (err < 0) 354 goto out; 355 if (dev->flags & IFF_ALLMULTI) { 356 err = dev_set_allmulti(lowerdev, 1); 357 if (err < 0) 358 goto del_unicast; 359 } 360 361 hash_add: 362 macvlan_hash_add(vlan); 363 return 0; 364 365 del_unicast: 366 dev_uc_del(lowerdev, dev->dev_addr); 367 out: 368 return err; 369 } 370 371 static int macvlan_stop(struct net_device *dev) 372 { 373 struct macvlan_dev *vlan = netdev_priv(dev); 374 struct net_device *lowerdev = vlan->lowerdev; 375 376 dev_uc_unsync(lowerdev, dev); 377 dev_mc_unsync(lowerdev, dev); 378 379 if (vlan->port->passthru) { 380 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 381 dev_set_promiscuity(lowerdev, -1); 382 goto hash_del; 383 } 384 385 if (dev->flags & IFF_ALLMULTI) 386 dev_set_allmulti(lowerdev, -1); 387 388 dev_uc_del(lowerdev, dev->dev_addr); 389 390 hash_del: 391 macvlan_hash_del(vlan, !dev->dismantle); 392 return 0; 393 } 394 395 static int macvlan_set_mac_address(struct net_device *dev, void *p) 396 { 397 struct macvlan_dev *vlan = netdev_priv(dev); 398 struct net_device *lowerdev = vlan->lowerdev; 399 struct sockaddr *addr = p; 400 int err; 401 402 if (!is_valid_ether_addr(addr->sa_data)) 403 return -EADDRNOTAVAIL; 404 405 if (!(dev->flags & IFF_UP)) { 406 /* Just copy in the new address */ 407 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 408 } else { 409 /* Rehash and update the device filters */ 410 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 411 return -EBUSY; 412 413 err = dev_uc_add(lowerdev, addr->sa_data); 414 if (err) 415 return err; 416 417 dev_uc_del(lowerdev, dev->dev_addr); 418 419 macvlan_hash_change_addr(vlan, addr->sa_data); 420 } 421 return 0; 422 } 423 424 static void macvlan_change_rx_flags(struct net_device *dev, int change) 425 { 426 struct macvlan_dev *vlan = netdev_priv(dev); 427 struct net_device *lowerdev = vlan->lowerdev; 428 429 if (change & IFF_ALLMULTI) 430 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 431 } 432 433 static void macvlan_set_mac_lists(struct net_device *dev) 434 { 435 struct macvlan_dev *vlan = netdev_priv(dev); 436 437 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 438 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); 439 } else { 440 struct netdev_hw_addr *ha; 441 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 442 443 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 444 netdev_for_each_mc_addr(ha, dev) { 445 __set_bit(mc_hash(vlan, ha->addr), filter); 446 } 447 448 __set_bit(mc_hash(vlan, dev->broadcast), filter); 449 450 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); 451 } 452 dev_uc_sync(vlan->lowerdev, dev); 453 dev_mc_sync(vlan->lowerdev, dev); 454 } 455 456 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 457 { 458 struct macvlan_dev *vlan = netdev_priv(dev); 459 460 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 461 return -EINVAL; 462 dev->mtu = new_mtu; 463 return 0; 464 } 465 466 /* 467 * macvlan network devices have devices nesting below it and are a special 468 * "super class" of normal network devices; split their locks off into a 469 * separate class since they always nest. 470 */ 471 static struct lock_class_key macvlan_netdev_xmit_lock_key; 472 static struct lock_class_key macvlan_netdev_addr_lock_key; 473 474 #define MACVLAN_FEATURES \ 475 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 476 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 477 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 478 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 479 480 #define MACVLAN_STATE_MASK \ 481 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 482 483 static void macvlan_set_lockdep_class_one(struct net_device *dev, 484 struct netdev_queue *txq, 485 void *_unused) 486 { 487 lockdep_set_class(&txq->_xmit_lock, 488 &macvlan_netdev_xmit_lock_key); 489 } 490 491 static void macvlan_set_lockdep_class(struct net_device *dev) 492 { 493 lockdep_set_class(&dev->addr_list_lock, 494 &macvlan_netdev_addr_lock_key); 495 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 496 } 497 498 static int macvlan_init(struct net_device *dev) 499 { 500 struct macvlan_dev *vlan = netdev_priv(dev); 501 const struct net_device *lowerdev = vlan->lowerdev; 502 503 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 504 (lowerdev->state & MACVLAN_STATE_MASK); 505 dev->features = lowerdev->features & MACVLAN_FEATURES; 506 dev->features |= NETIF_F_LLTX; 507 dev->gso_max_size = lowerdev->gso_max_size; 508 dev->iflink = lowerdev->ifindex; 509 dev->hard_header_len = lowerdev->hard_header_len; 510 511 macvlan_set_lockdep_class(dev); 512 513 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats); 514 if (!vlan->pcpu_stats) 515 return -ENOMEM; 516 517 return 0; 518 } 519 520 static void macvlan_uninit(struct net_device *dev) 521 { 522 struct macvlan_dev *vlan = netdev_priv(dev); 523 struct macvlan_port *port = vlan->port; 524 525 free_percpu(vlan->pcpu_stats); 526 527 port->count -= 1; 528 if (!port->count) 529 macvlan_port_destroy(port->dev); 530 } 531 532 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 533 struct rtnl_link_stats64 *stats) 534 { 535 struct macvlan_dev *vlan = netdev_priv(dev); 536 537 if (vlan->pcpu_stats) { 538 struct macvlan_pcpu_stats *p; 539 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 540 u32 rx_errors = 0, tx_dropped = 0; 541 unsigned int start; 542 int i; 543 544 for_each_possible_cpu(i) { 545 p = per_cpu_ptr(vlan->pcpu_stats, i); 546 do { 547 start = u64_stats_fetch_begin_bh(&p->syncp); 548 rx_packets = p->rx_packets; 549 rx_bytes = p->rx_bytes; 550 rx_multicast = p->rx_multicast; 551 tx_packets = p->tx_packets; 552 tx_bytes = p->tx_bytes; 553 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 554 555 stats->rx_packets += rx_packets; 556 stats->rx_bytes += rx_bytes; 557 stats->multicast += rx_multicast; 558 stats->tx_packets += tx_packets; 559 stats->tx_bytes += tx_bytes; 560 /* rx_errors & tx_dropped are u32, updated 561 * without syncp protection. 562 */ 563 rx_errors += p->rx_errors; 564 tx_dropped += p->tx_dropped; 565 } 566 stats->rx_errors = rx_errors; 567 stats->rx_dropped = rx_errors; 568 stats->tx_dropped = tx_dropped; 569 } 570 return stats; 571 } 572 573 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 574 __be16 proto, u16 vid) 575 { 576 struct macvlan_dev *vlan = netdev_priv(dev); 577 struct net_device *lowerdev = vlan->lowerdev; 578 579 return vlan_vid_add(lowerdev, proto, vid); 580 } 581 582 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 583 __be16 proto, u16 vid) 584 { 585 struct macvlan_dev *vlan = netdev_priv(dev); 586 struct net_device *lowerdev = vlan->lowerdev; 587 588 vlan_vid_del(lowerdev, proto, vid); 589 return 0; 590 } 591 592 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 593 struct net_device *dev, 594 const unsigned char *addr, 595 u16 flags) 596 { 597 struct macvlan_dev *vlan = netdev_priv(dev); 598 int err = -EINVAL; 599 600 if (!vlan->port->passthru) 601 return -EOPNOTSUPP; 602 603 if (is_unicast_ether_addr(addr)) 604 err = dev_uc_add_excl(dev, addr); 605 else if (is_multicast_ether_addr(addr)) 606 err = dev_mc_add_excl(dev, addr); 607 608 return err; 609 } 610 611 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 612 struct net_device *dev, 613 const unsigned char *addr) 614 { 615 struct macvlan_dev *vlan = netdev_priv(dev); 616 int err = -EINVAL; 617 618 if (!vlan->port->passthru) 619 return -EOPNOTSUPP; 620 621 if (is_unicast_ether_addr(addr)) 622 err = dev_uc_del(dev, addr); 623 else if (is_multicast_ether_addr(addr)) 624 err = dev_mc_del(dev, addr); 625 626 return err; 627 } 628 629 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 630 struct ethtool_drvinfo *drvinfo) 631 { 632 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 633 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 634 } 635 636 static int macvlan_ethtool_get_settings(struct net_device *dev, 637 struct ethtool_cmd *cmd) 638 { 639 const struct macvlan_dev *vlan = netdev_priv(dev); 640 641 return __ethtool_get_settings(vlan->lowerdev, cmd); 642 } 643 644 static netdev_features_t macvlan_fix_features(struct net_device *dev, 645 netdev_features_t features) 646 { 647 struct macvlan_dev *vlan = netdev_priv(dev); 648 649 return features & (vlan->set_features | ~MACVLAN_FEATURES); 650 } 651 652 static const struct ethtool_ops macvlan_ethtool_ops = { 653 .get_link = ethtool_op_get_link, 654 .get_settings = macvlan_ethtool_get_settings, 655 .get_drvinfo = macvlan_ethtool_get_drvinfo, 656 }; 657 658 static const struct net_device_ops macvlan_netdev_ops = { 659 .ndo_init = macvlan_init, 660 .ndo_uninit = macvlan_uninit, 661 .ndo_open = macvlan_open, 662 .ndo_stop = macvlan_stop, 663 .ndo_start_xmit = macvlan_start_xmit, 664 .ndo_change_mtu = macvlan_change_mtu, 665 .ndo_fix_features = macvlan_fix_features, 666 .ndo_change_rx_flags = macvlan_change_rx_flags, 667 .ndo_set_mac_address = macvlan_set_mac_address, 668 .ndo_set_rx_mode = macvlan_set_mac_lists, 669 .ndo_get_stats64 = macvlan_dev_get_stats64, 670 .ndo_validate_addr = eth_validate_addr, 671 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 672 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 673 .ndo_fdb_add = macvlan_fdb_add, 674 .ndo_fdb_del = macvlan_fdb_del, 675 .ndo_fdb_dump = ndo_dflt_fdb_dump, 676 }; 677 678 void macvlan_common_setup(struct net_device *dev) 679 { 680 ether_setup(dev); 681 682 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 683 dev->priv_flags |= IFF_UNICAST_FLT; 684 dev->netdev_ops = &macvlan_netdev_ops; 685 dev->destructor = free_netdev; 686 dev->header_ops = &macvlan_hard_header_ops, 687 dev->ethtool_ops = &macvlan_ethtool_ops; 688 } 689 EXPORT_SYMBOL_GPL(macvlan_common_setup); 690 691 static void macvlan_setup(struct net_device *dev) 692 { 693 macvlan_common_setup(dev); 694 dev->tx_queue_len = 0; 695 } 696 697 static int macvlan_port_create(struct net_device *dev) 698 { 699 struct macvlan_port *port; 700 unsigned int i; 701 int err; 702 703 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 704 return -EINVAL; 705 706 port = kzalloc(sizeof(*port), GFP_KERNEL); 707 if (port == NULL) 708 return -ENOMEM; 709 710 port->passthru = false; 711 port->dev = dev; 712 INIT_LIST_HEAD(&port->vlans); 713 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 714 INIT_HLIST_HEAD(&port->vlan_hash[i]); 715 716 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 717 if (err) 718 kfree(port); 719 else 720 dev->priv_flags |= IFF_MACVLAN_PORT; 721 return err; 722 } 723 724 static void macvlan_port_destroy(struct net_device *dev) 725 { 726 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 727 728 dev->priv_flags &= ~IFF_MACVLAN_PORT; 729 netdev_rx_handler_unregister(dev); 730 kfree_rcu(port, rcu); 731 } 732 733 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 734 { 735 if (tb[IFLA_ADDRESS]) { 736 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 737 return -EINVAL; 738 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 739 return -EADDRNOTAVAIL; 740 } 741 742 if (data && data[IFLA_MACVLAN_FLAGS] && 743 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 744 return -EINVAL; 745 746 if (data && data[IFLA_MACVLAN_MODE]) { 747 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 748 case MACVLAN_MODE_PRIVATE: 749 case MACVLAN_MODE_VEPA: 750 case MACVLAN_MODE_BRIDGE: 751 case MACVLAN_MODE_PASSTHRU: 752 break; 753 default: 754 return -EINVAL; 755 } 756 } 757 return 0; 758 } 759 760 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 761 struct nlattr *tb[], struct nlattr *data[], 762 int (*receive)(struct sk_buff *skb), 763 int (*forward)(struct net_device *dev, 764 struct sk_buff *skb)) 765 { 766 struct macvlan_dev *vlan = netdev_priv(dev); 767 struct macvlan_port *port; 768 struct net_device *lowerdev; 769 int err; 770 771 if (!tb[IFLA_LINK]) 772 return -EINVAL; 773 774 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 775 if (lowerdev == NULL) 776 return -ENODEV; 777 778 /* When creating macvlans on top of other macvlans - use 779 * the real device as the lowerdev. 780 */ 781 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { 782 struct macvlan_dev *lowervlan = netdev_priv(lowerdev); 783 lowerdev = lowervlan->lowerdev; 784 } 785 786 if (!tb[IFLA_MTU]) 787 dev->mtu = lowerdev->mtu; 788 else if (dev->mtu > lowerdev->mtu) 789 return -EINVAL; 790 791 if (!tb[IFLA_ADDRESS]) 792 eth_hw_addr_random(dev); 793 794 if (!macvlan_port_exists(lowerdev)) { 795 err = macvlan_port_create(lowerdev); 796 if (err < 0) 797 return err; 798 } 799 port = macvlan_port_get_rtnl(lowerdev); 800 801 /* Only 1 macvlan device can be created in passthru mode */ 802 if (port->passthru) 803 return -EINVAL; 804 805 vlan->lowerdev = lowerdev; 806 vlan->dev = dev; 807 vlan->port = port; 808 vlan->receive = receive; 809 vlan->forward = forward; 810 vlan->set_features = MACVLAN_FEATURES; 811 812 vlan->mode = MACVLAN_MODE_VEPA; 813 if (data && data[IFLA_MACVLAN_MODE]) 814 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 815 816 if (data && data[IFLA_MACVLAN_FLAGS]) 817 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 818 819 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 820 if (port->count) 821 return -EINVAL; 822 port->passthru = true; 823 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN); 824 } 825 826 err = netdev_upper_dev_link(lowerdev, dev); 827 if (err) 828 goto destroy_port; 829 830 port->count += 1; 831 err = register_netdevice(dev); 832 if (err < 0) 833 goto upper_dev_unlink; 834 835 list_add_tail_rcu(&vlan->list, &port->vlans); 836 netif_stacked_transfer_operstate(lowerdev, dev); 837 838 return 0; 839 840 upper_dev_unlink: 841 netdev_upper_dev_unlink(lowerdev, dev); 842 destroy_port: 843 port->count -= 1; 844 if (!port->count) 845 macvlan_port_destroy(lowerdev); 846 847 return err; 848 } 849 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 850 851 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 852 struct nlattr *tb[], struct nlattr *data[]) 853 { 854 return macvlan_common_newlink(src_net, dev, tb, data, 855 netif_rx, 856 dev_forward_skb); 857 } 858 859 void macvlan_dellink(struct net_device *dev, struct list_head *head) 860 { 861 struct macvlan_dev *vlan = netdev_priv(dev); 862 863 list_del_rcu(&vlan->list); 864 unregister_netdevice_queue(dev, head); 865 netdev_upper_dev_unlink(vlan->lowerdev, dev); 866 } 867 EXPORT_SYMBOL_GPL(macvlan_dellink); 868 869 static int macvlan_changelink(struct net_device *dev, 870 struct nlattr *tb[], struct nlattr *data[]) 871 { 872 struct macvlan_dev *vlan = netdev_priv(dev); 873 enum macvlan_mode mode; 874 bool set_mode = false; 875 876 /* Validate mode, but don't set yet: setting flags may fail. */ 877 if (data && data[IFLA_MACVLAN_MODE]) { 878 set_mode = true; 879 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 880 /* Passthrough mode can't be set or cleared dynamically */ 881 if ((mode == MACVLAN_MODE_PASSTHRU) != 882 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 883 return -EINVAL; 884 } 885 886 if (data && data[IFLA_MACVLAN_FLAGS]) { 887 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 888 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 889 if (vlan->port->passthru && promisc) { 890 int err; 891 892 if (flags & MACVLAN_FLAG_NOPROMISC) 893 err = dev_set_promiscuity(vlan->lowerdev, -1); 894 else 895 err = dev_set_promiscuity(vlan->lowerdev, 1); 896 if (err < 0) 897 return err; 898 } 899 vlan->flags = flags; 900 } 901 if (set_mode) 902 vlan->mode = mode; 903 return 0; 904 } 905 906 static size_t macvlan_get_size(const struct net_device *dev) 907 { 908 return (0 909 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 910 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 911 ); 912 } 913 914 static int macvlan_fill_info(struct sk_buff *skb, 915 const struct net_device *dev) 916 { 917 struct macvlan_dev *vlan = netdev_priv(dev); 918 919 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 920 goto nla_put_failure; 921 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 922 goto nla_put_failure; 923 return 0; 924 925 nla_put_failure: 926 return -EMSGSIZE; 927 } 928 929 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 930 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 931 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 932 }; 933 934 int macvlan_link_register(struct rtnl_link_ops *ops) 935 { 936 /* common fields */ 937 ops->priv_size = sizeof(struct macvlan_dev); 938 ops->validate = macvlan_validate; 939 ops->maxtype = IFLA_MACVLAN_MAX; 940 ops->policy = macvlan_policy; 941 ops->changelink = macvlan_changelink; 942 ops->get_size = macvlan_get_size; 943 ops->fill_info = macvlan_fill_info; 944 945 return rtnl_link_register(ops); 946 }; 947 EXPORT_SYMBOL_GPL(macvlan_link_register); 948 949 static struct rtnl_link_ops macvlan_link_ops = { 950 .kind = "macvlan", 951 .setup = macvlan_setup, 952 .newlink = macvlan_newlink, 953 .dellink = macvlan_dellink, 954 }; 955 956 static int macvlan_device_event(struct notifier_block *unused, 957 unsigned long event, void *ptr) 958 { 959 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 960 struct macvlan_dev *vlan, *next; 961 struct macvlan_port *port; 962 LIST_HEAD(list_kill); 963 964 if (!macvlan_port_exists(dev)) 965 return NOTIFY_DONE; 966 967 port = macvlan_port_get_rtnl(dev); 968 969 switch (event) { 970 case NETDEV_CHANGE: 971 list_for_each_entry(vlan, &port->vlans, list) 972 netif_stacked_transfer_operstate(vlan->lowerdev, 973 vlan->dev); 974 break; 975 case NETDEV_FEAT_CHANGE: 976 list_for_each_entry(vlan, &port->vlans, list) { 977 vlan->dev->features = dev->features & MACVLAN_FEATURES; 978 vlan->dev->gso_max_size = dev->gso_max_size; 979 netdev_features_change(vlan->dev); 980 } 981 break; 982 case NETDEV_UNREGISTER: 983 /* twiddle thumbs on netns device moves */ 984 if (dev->reg_state != NETREG_UNREGISTERING) 985 break; 986 987 list_for_each_entry_safe(vlan, next, &port->vlans, list) 988 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 989 unregister_netdevice_many(&list_kill); 990 list_del(&list_kill); 991 break; 992 case NETDEV_PRE_TYPE_CHANGE: 993 /* Forbid underlaying device to change its type. */ 994 return NOTIFY_BAD; 995 } 996 return NOTIFY_DONE; 997 } 998 999 static struct notifier_block macvlan_notifier_block __read_mostly = { 1000 .notifier_call = macvlan_device_event, 1001 }; 1002 1003 static int __init macvlan_init_module(void) 1004 { 1005 int err; 1006 1007 register_netdevice_notifier(&macvlan_notifier_block); 1008 1009 err = macvlan_link_register(&macvlan_link_ops); 1010 if (err < 0) 1011 goto err1; 1012 return 0; 1013 err1: 1014 unregister_netdevice_notifier(&macvlan_notifier_block); 1015 return err; 1016 } 1017 1018 static void __exit macvlan_cleanup_module(void) 1019 { 1020 rtnl_link_unregister(&macvlan_link_ops); 1021 unregister_netdevice_notifier(&macvlan_notifier_block); 1022 } 1023 1024 module_init(macvlan_init_module); 1025 module_exit(macvlan_cleanup_module); 1026 1027 MODULE_LICENSE("GPL"); 1028 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1029 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1030 MODULE_ALIAS_RTNL_LINK("macvlan"); 1031