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