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