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; 121 122 if (local) 123 return vlan->forward(dev, skb); 124 125 skb->dev = dev; 126 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 127 skb->pkt_type = PACKET_BROADCAST; 128 else 129 skb->pkt_type = PACKET_MULTICAST; 130 131 return vlan->receive(skb); 132 } 133 134 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 135 { 136 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 137 } 138 139 140 static unsigned int mc_hash(const struct macvlan_dev *vlan, 141 const unsigned char *addr) 142 { 143 u32 val = __get_unaligned_cpu32(addr + 2); 144 145 val ^= macvlan_hash_mix(vlan); 146 return hash_32(val, MACVLAN_MC_FILTER_BITS); 147 } 148 149 static void macvlan_broadcast(struct sk_buff *skb, 150 const struct macvlan_port *port, 151 struct net_device *src, 152 enum macvlan_mode mode) 153 { 154 const struct ethhdr *eth = eth_hdr(skb); 155 const struct macvlan_dev *vlan; 156 struct sk_buff *nskb; 157 unsigned int i; 158 int err; 159 unsigned int hash; 160 161 if (skb->protocol == htons(ETH_P_PAUSE)) 162 return; 163 164 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 165 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 166 if (vlan->dev == src || !(vlan->mode & mode)) 167 continue; 168 169 hash = mc_hash(vlan, eth->h_dest); 170 if (!test_bit(hash, vlan->mc_filter)) 171 continue; 172 173 err = NET_RX_DROP; 174 nskb = skb_clone(skb, GFP_ATOMIC); 175 if (likely(nskb)) 176 err = macvlan_broadcast_one( 177 nskb, vlan, eth, 178 mode == MACVLAN_MODE_BRIDGE); 179 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 180 err == NET_RX_SUCCESS, 1); 181 } 182 } 183 } 184 185 /* called under rcu_read_lock() from netif_receive_skb */ 186 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 187 { 188 struct macvlan_port *port; 189 struct sk_buff *skb = *pskb; 190 const struct ethhdr *eth = eth_hdr(skb); 191 const struct macvlan_dev *vlan; 192 const struct macvlan_dev *src; 193 struct net_device *dev; 194 unsigned int len = 0; 195 int ret = NET_RX_DROP; 196 197 port = macvlan_port_get_rcu(skb->dev); 198 if (is_multicast_ether_addr(eth->h_dest)) { 199 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN); 200 if (!skb) 201 return RX_HANDLER_CONSUMED; 202 eth = eth_hdr(skb); 203 src = macvlan_hash_lookup(port, eth->h_source); 204 if (!src) 205 /* frame comes from an external address */ 206 macvlan_broadcast(skb, port, NULL, 207 MACVLAN_MODE_PRIVATE | 208 MACVLAN_MODE_VEPA | 209 MACVLAN_MODE_PASSTHRU| 210 MACVLAN_MODE_BRIDGE); 211 else if (src->mode == MACVLAN_MODE_VEPA) 212 /* flood to everyone except source */ 213 macvlan_broadcast(skb, port, src->dev, 214 MACVLAN_MODE_VEPA | 215 MACVLAN_MODE_BRIDGE); 216 else if (src->mode == MACVLAN_MODE_BRIDGE) 217 /* 218 * flood only to VEPA ports, bridge ports 219 * already saw the frame on the way out. 220 */ 221 macvlan_broadcast(skb, port, src->dev, 222 MACVLAN_MODE_VEPA); 223 else { 224 /* forward to original port. */ 225 vlan = src; 226 ret = macvlan_broadcast_one(skb, vlan, eth, 0); 227 goto out; 228 } 229 230 return RX_HANDLER_PASS; 231 } 232 233 if (port->passthru) 234 vlan = list_first_or_null_rcu(&port->vlans, 235 struct macvlan_dev, list); 236 else 237 vlan = macvlan_hash_lookup(port, eth->h_dest); 238 if (vlan == NULL) 239 return RX_HANDLER_PASS; 240 241 dev = vlan->dev; 242 if (unlikely(!(dev->flags & IFF_UP))) { 243 kfree_skb(skb); 244 return RX_HANDLER_CONSUMED; 245 } 246 len = skb->len + ETH_HLEN; 247 skb = skb_share_check(skb, GFP_ATOMIC); 248 if (!skb) 249 goto out; 250 251 skb->dev = dev; 252 skb->pkt_type = PACKET_HOST; 253 254 ret = vlan->receive(skb); 255 256 out: 257 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); 258 return RX_HANDLER_CONSUMED; 259 } 260 261 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 262 { 263 const struct macvlan_dev *vlan = netdev_priv(dev); 264 const struct macvlan_port *port = vlan->port; 265 const struct macvlan_dev *dest; 266 __u8 ip_summed = skb->ip_summed; 267 268 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 269 const struct ethhdr *eth = (void *)skb->data; 270 skb->ip_summed = CHECKSUM_UNNECESSARY; 271 272 /* send to other bridge ports directly */ 273 if (is_multicast_ether_addr(eth->h_dest)) { 274 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 275 goto xmit_world; 276 } 277 278 dest = macvlan_hash_lookup(port, eth->h_dest); 279 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 280 /* send to lowerdev first for its network taps */ 281 dev_forward_skb(vlan->lowerdev, skb); 282 283 return NET_XMIT_SUCCESS; 284 } 285 } 286 287 xmit_world: 288 skb->ip_summed = ip_summed; 289 skb->dev = vlan->lowerdev; 290 return dev_queue_xmit(skb); 291 } 292 293 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 294 struct net_device *dev) 295 { 296 unsigned int len = skb->len; 297 int ret; 298 const struct macvlan_dev *vlan = netdev_priv(dev); 299 300 ret = macvlan_queue_xmit(skb, dev); 301 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 302 struct macvlan_pcpu_stats *pcpu_stats; 303 304 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 305 u64_stats_update_begin(&pcpu_stats->syncp); 306 pcpu_stats->tx_packets++; 307 pcpu_stats->tx_bytes += len; 308 u64_stats_update_end(&pcpu_stats->syncp); 309 } else { 310 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 311 } 312 return ret; 313 } 314 EXPORT_SYMBOL_GPL(macvlan_start_xmit); 315 316 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 317 unsigned short type, const void *daddr, 318 const void *saddr, unsigned len) 319 { 320 const struct macvlan_dev *vlan = netdev_priv(dev); 321 struct net_device *lowerdev = vlan->lowerdev; 322 323 return dev_hard_header(skb, lowerdev, type, daddr, 324 saddr ? : dev->dev_addr, len); 325 } 326 327 static const struct header_ops macvlan_hard_header_ops = { 328 .create = macvlan_hard_header, 329 .rebuild = eth_rebuild_header, 330 .parse = eth_header_parse, 331 .cache = eth_header_cache, 332 .cache_update = eth_header_cache_update, 333 }; 334 335 static int macvlan_open(struct net_device *dev) 336 { 337 struct macvlan_dev *vlan = netdev_priv(dev); 338 struct net_device *lowerdev = vlan->lowerdev; 339 int err; 340 341 if (vlan->port->passthru) { 342 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 343 err = dev_set_promiscuity(lowerdev, 1); 344 if (err < 0) 345 goto out; 346 } 347 goto hash_add; 348 } 349 350 err = -EBUSY; 351 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 352 goto out; 353 354 err = dev_uc_add(lowerdev, dev->dev_addr); 355 if (err < 0) 356 goto out; 357 if (dev->flags & IFF_ALLMULTI) { 358 err = dev_set_allmulti(lowerdev, 1); 359 if (err < 0) 360 goto del_unicast; 361 } 362 363 hash_add: 364 macvlan_hash_add(vlan); 365 return 0; 366 367 del_unicast: 368 dev_uc_del(lowerdev, dev->dev_addr); 369 out: 370 return err; 371 } 372 373 static int macvlan_stop(struct net_device *dev) 374 { 375 struct macvlan_dev *vlan = netdev_priv(dev); 376 struct net_device *lowerdev = vlan->lowerdev; 377 378 dev_uc_unsync(lowerdev, dev); 379 dev_mc_unsync(lowerdev, dev); 380 381 if (vlan->port->passthru) { 382 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 383 dev_set_promiscuity(lowerdev, -1); 384 goto hash_del; 385 } 386 387 if (dev->flags & IFF_ALLMULTI) 388 dev_set_allmulti(lowerdev, -1); 389 390 dev_uc_del(lowerdev, dev->dev_addr); 391 392 hash_del: 393 macvlan_hash_del(vlan, !dev->dismantle); 394 return 0; 395 } 396 397 static int macvlan_set_mac_address(struct net_device *dev, void *p) 398 { 399 struct macvlan_dev *vlan = netdev_priv(dev); 400 struct net_device *lowerdev = vlan->lowerdev; 401 struct sockaddr *addr = p; 402 int err; 403 404 if (!is_valid_ether_addr(addr->sa_data)) 405 return -EADDRNOTAVAIL; 406 407 if (!(dev->flags & IFF_UP)) { 408 /* Just copy in the new address */ 409 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 410 } else { 411 /* Rehash and update the device filters */ 412 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 413 return -EBUSY; 414 415 err = dev_uc_add(lowerdev, addr->sa_data); 416 if (err) 417 return err; 418 419 dev_uc_del(lowerdev, dev->dev_addr); 420 421 macvlan_hash_change_addr(vlan, addr->sa_data); 422 } 423 return 0; 424 } 425 426 static void macvlan_change_rx_flags(struct net_device *dev, int change) 427 { 428 struct macvlan_dev *vlan = netdev_priv(dev); 429 struct net_device *lowerdev = vlan->lowerdev; 430 431 if (change & IFF_ALLMULTI) 432 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 433 } 434 435 static void macvlan_set_mac_lists(struct net_device *dev) 436 { 437 struct macvlan_dev *vlan = netdev_priv(dev); 438 439 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 440 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); 441 } else { 442 struct netdev_hw_addr *ha; 443 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 444 445 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 446 netdev_for_each_mc_addr(ha, dev) { 447 __set_bit(mc_hash(vlan, ha->addr), filter); 448 } 449 450 __set_bit(mc_hash(vlan, dev->broadcast), filter); 451 452 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); 453 } 454 dev_uc_sync(vlan->lowerdev, dev); 455 dev_mc_sync(vlan->lowerdev, dev); 456 } 457 458 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 459 { 460 struct macvlan_dev *vlan = netdev_priv(dev); 461 462 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 463 return -EINVAL; 464 dev->mtu = new_mtu; 465 return 0; 466 } 467 468 /* 469 * macvlan network devices have devices nesting below it and are a special 470 * "super class" of normal network devices; split their locks off into a 471 * separate class since they always nest. 472 */ 473 static struct lock_class_key macvlan_netdev_xmit_lock_key; 474 static struct lock_class_key macvlan_netdev_addr_lock_key; 475 476 #define MACVLAN_FEATURES \ 477 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 478 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 479 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 480 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 481 482 #define MACVLAN_STATE_MASK \ 483 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 484 485 static void macvlan_set_lockdep_class_one(struct net_device *dev, 486 struct netdev_queue *txq, 487 void *_unused) 488 { 489 lockdep_set_class(&txq->_xmit_lock, 490 &macvlan_netdev_xmit_lock_key); 491 } 492 493 static void macvlan_set_lockdep_class(struct net_device *dev) 494 { 495 lockdep_set_class(&dev->addr_list_lock, 496 &macvlan_netdev_addr_lock_key); 497 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 498 } 499 500 static int macvlan_init(struct net_device *dev) 501 { 502 struct macvlan_dev *vlan = netdev_priv(dev); 503 const struct net_device *lowerdev = vlan->lowerdev; 504 505 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 506 (lowerdev->state & MACVLAN_STATE_MASK); 507 dev->features = lowerdev->features & MACVLAN_FEATURES; 508 dev->features |= NETIF_F_LLTX; 509 dev->gso_max_size = lowerdev->gso_max_size; 510 dev->iflink = lowerdev->ifindex; 511 dev->hard_header_len = lowerdev->hard_header_len; 512 513 macvlan_set_lockdep_class(dev); 514 515 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats); 516 if (!vlan->pcpu_stats) 517 return -ENOMEM; 518 519 return 0; 520 } 521 522 static void macvlan_uninit(struct net_device *dev) 523 { 524 struct macvlan_dev *vlan = netdev_priv(dev); 525 struct macvlan_port *port = vlan->port; 526 527 free_percpu(vlan->pcpu_stats); 528 529 port->count -= 1; 530 if (!port->count) 531 macvlan_port_destroy(port->dev); 532 } 533 534 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 535 struct rtnl_link_stats64 *stats) 536 { 537 struct macvlan_dev *vlan = netdev_priv(dev); 538 539 if (vlan->pcpu_stats) { 540 struct macvlan_pcpu_stats *p; 541 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 542 u32 rx_errors = 0, tx_dropped = 0; 543 unsigned int start; 544 int i; 545 546 for_each_possible_cpu(i) { 547 p = per_cpu_ptr(vlan->pcpu_stats, i); 548 do { 549 start = u64_stats_fetch_begin_bh(&p->syncp); 550 rx_packets = p->rx_packets; 551 rx_bytes = p->rx_bytes; 552 rx_multicast = p->rx_multicast; 553 tx_packets = p->tx_packets; 554 tx_bytes = p->tx_bytes; 555 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 556 557 stats->rx_packets += rx_packets; 558 stats->rx_bytes += rx_bytes; 559 stats->multicast += rx_multicast; 560 stats->tx_packets += tx_packets; 561 stats->tx_bytes += tx_bytes; 562 /* rx_errors & tx_dropped are u32, updated 563 * without syncp protection. 564 */ 565 rx_errors += p->rx_errors; 566 tx_dropped += p->tx_dropped; 567 } 568 stats->rx_errors = rx_errors; 569 stats->rx_dropped = rx_errors; 570 stats->tx_dropped = tx_dropped; 571 } 572 return stats; 573 } 574 575 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 576 __be16 proto, u16 vid) 577 { 578 struct macvlan_dev *vlan = netdev_priv(dev); 579 struct net_device *lowerdev = vlan->lowerdev; 580 581 return vlan_vid_add(lowerdev, proto, vid); 582 } 583 584 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 585 __be16 proto, u16 vid) 586 { 587 struct macvlan_dev *vlan = netdev_priv(dev); 588 struct net_device *lowerdev = vlan->lowerdev; 589 590 vlan_vid_del(lowerdev, proto, vid); 591 return 0; 592 } 593 594 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 595 struct net_device *dev, 596 const unsigned char *addr, 597 u16 flags) 598 { 599 struct macvlan_dev *vlan = netdev_priv(dev); 600 int err = -EINVAL; 601 602 if (!vlan->port->passthru) 603 return -EOPNOTSUPP; 604 605 if (flags & NLM_F_REPLACE) 606 return -EOPNOTSUPP; 607 608 if (is_unicast_ether_addr(addr)) 609 err = dev_uc_add_excl(dev, addr); 610 else if (is_multicast_ether_addr(addr)) 611 err = dev_mc_add_excl(dev, addr); 612 613 return err; 614 } 615 616 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 617 struct net_device *dev, 618 const unsigned char *addr) 619 { 620 struct macvlan_dev *vlan = netdev_priv(dev); 621 int err = -EINVAL; 622 623 if (!vlan->port->passthru) 624 return -EOPNOTSUPP; 625 626 if (is_unicast_ether_addr(addr)) 627 err = dev_uc_del(dev, addr); 628 else if (is_multicast_ether_addr(addr)) 629 err = dev_mc_del(dev, addr); 630 631 return err; 632 } 633 634 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 635 struct ethtool_drvinfo *drvinfo) 636 { 637 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 638 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 639 } 640 641 static int macvlan_ethtool_get_settings(struct net_device *dev, 642 struct ethtool_cmd *cmd) 643 { 644 const struct macvlan_dev *vlan = netdev_priv(dev); 645 646 return __ethtool_get_settings(vlan->lowerdev, cmd); 647 } 648 649 static netdev_features_t macvlan_fix_features(struct net_device *dev, 650 netdev_features_t features) 651 { 652 struct macvlan_dev *vlan = netdev_priv(dev); 653 654 return features & (vlan->set_features | ~MACVLAN_FEATURES); 655 } 656 657 static const struct ethtool_ops macvlan_ethtool_ops = { 658 .get_link = ethtool_op_get_link, 659 .get_settings = macvlan_ethtool_get_settings, 660 .get_drvinfo = macvlan_ethtool_get_drvinfo, 661 }; 662 663 static const struct net_device_ops macvlan_netdev_ops = { 664 .ndo_init = macvlan_init, 665 .ndo_uninit = macvlan_uninit, 666 .ndo_open = macvlan_open, 667 .ndo_stop = macvlan_stop, 668 .ndo_start_xmit = macvlan_start_xmit, 669 .ndo_change_mtu = macvlan_change_mtu, 670 .ndo_fix_features = macvlan_fix_features, 671 .ndo_change_rx_flags = macvlan_change_rx_flags, 672 .ndo_set_mac_address = macvlan_set_mac_address, 673 .ndo_set_rx_mode = macvlan_set_mac_lists, 674 .ndo_get_stats64 = macvlan_dev_get_stats64, 675 .ndo_validate_addr = eth_validate_addr, 676 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 677 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 678 .ndo_fdb_add = macvlan_fdb_add, 679 .ndo_fdb_del = macvlan_fdb_del, 680 .ndo_fdb_dump = ndo_dflt_fdb_dump, 681 }; 682 683 void macvlan_common_setup(struct net_device *dev) 684 { 685 ether_setup(dev); 686 687 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 688 dev->priv_flags |= IFF_UNICAST_FLT; 689 dev->netdev_ops = &macvlan_netdev_ops; 690 dev->destructor = free_netdev; 691 dev->header_ops = &macvlan_hard_header_ops; 692 dev->ethtool_ops = &macvlan_ethtool_ops; 693 } 694 EXPORT_SYMBOL_GPL(macvlan_common_setup); 695 696 static void macvlan_setup(struct net_device *dev) 697 { 698 macvlan_common_setup(dev); 699 dev->tx_queue_len = 0; 700 } 701 702 static int macvlan_port_create(struct net_device *dev) 703 { 704 struct macvlan_port *port; 705 unsigned int i; 706 int err; 707 708 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 709 return -EINVAL; 710 711 port = kzalloc(sizeof(*port), GFP_KERNEL); 712 if (port == NULL) 713 return -ENOMEM; 714 715 port->passthru = false; 716 port->dev = dev; 717 INIT_LIST_HEAD(&port->vlans); 718 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 719 INIT_HLIST_HEAD(&port->vlan_hash[i]); 720 721 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 722 if (err) 723 kfree(port); 724 else 725 dev->priv_flags |= IFF_MACVLAN_PORT; 726 return err; 727 } 728 729 static void macvlan_port_destroy(struct net_device *dev) 730 { 731 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 732 733 dev->priv_flags &= ~IFF_MACVLAN_PORT; 734 netdev_rx_handler_unregister(dev); 735 kfree_rcu(port, rcu); 736 } 737 738 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 739 { 740 if (tb[IFLA_ADDRESS]) { 741 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 742 return -EINVAL; 743 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 744 return -EADDRNOTAVAIL; 745 } 746 747 if (data && data[IFLA_MACVLAN_FLAGS] && 748 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 749 return -EINVAL; 750 751 if (data && data[IFLA_MACVLAN_MODE]) { 752 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 753 case MACVLAN_MODE_PRIVATE: 754 case MACVLAN_MODE_VEPA: 755 case MACVLAN_MODE_BRIDGE: 756 case MACVLAN_MODE_PASSTHRU: 757 break; 758 default: 759 return -EINVAL; 760 } 761 } 762 return 0; 763 } 764 765 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 766 struct nlattr *tb[], struct nlattr *data[], 767 int (*receive)(struct sk_buff *skb), 768 int (*forward)(struct net_device *dev, 769 struct sk_buff *skb)) 770 { 771 struct macvlan_dev *vlan = netdev_priv(dev); 772 struct macvlan_port *port; 773 struct net_device *lowerdev; 774 int err; 775 776 if (!tb[IFLA_LINK]) 777 return -EINVAL; 778 779 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 780 if (lowerdev == NULL) 781 return -ENODEV; 782 783 /* When creating macvlans on top of other macvlans - use 784 * the real device as the lowerdev. 785 */ 786 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { 787 struct macvlan_dev *lowervlan = netdev_priv(lowerdev); 788 lowerdev = lowervlan->lowerdev; 789 } 790 791 if (!tb[IFLA_MTU]) 792 dev->mtu = lowerdev->mtu; 793 else if (dev->mtu > lowerdev->mtu) 794 return -EINVAL; 795 796 if (!tb[IFLA_ADDRESS]) 797 eth_hw_addr_random(dev); 798 799 if (!macvlan_port_exists(lowerdev)) { 800 err = macvlan_port_create(lowerdev); 801 if (err < 0) 802 return err; 803 } 804 port = macvlan_port_get_rtnl(lowerdev); 805 806 /* Only 1 macvlan device can be created in passthru mode */ 807 if (port->passthru) 808 return -EINVAL; 809 810 vlan->lowerdev = lowerdev; 811 vlan->dev = dev; 812 vlan->port = port; 813 vlan->receive = receive; 814 vlan->forward = forward; 815 vlan->set_features = MACVLAN_FEATURES; 816 817 vlan->mode = MACVLAN_MODE_VEPA; 818 if (data && data[IFLA_MACVLAN_MODE]) 819 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 820 821 if (data && data[IFLA_MACVLAN_FLAGS]) 822 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 823 824 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 825 if (port->count) 826 return -EINVAL; 827 port->passthru = true; 828 eth_hw_addr_inherit(dev, lowerdev); 829 } 830 831 err = netdev_upper_dev_link(lowerdev, dev); 832 if (err) 833 goto destroy_port; 834 835 port->count += 1; 836 err = register_netdevice(dev); 837 if (err < 0) 838 goto upper_dev_unlink; 839 840 list_add_tail_rcu(&vlan->list, &port->vlans); 841 netif_stacked_transfer_operstate(lowerdev, dev); 842 843 return 0; 844 845 upper_dev_unlink: 846 netdev_upper_dev_unlink(lowerdev, dev); 847 destroy_port: 848 port->count -= 1; 849 if (!port->count) 850 macvlan_port_destroy(lowerdev); 851 852 return err; 853 } 854 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 855 856 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 857 struct nlattr *tb[], struct nlattr *data[]) 858 { 859 return macvlan_common_newlink(src_net, dev, tb, data, 860 netif_rx, 861 dev_forward_skb); 862 } 863 864 void macvlan_dellink(struct net_device *dev, struct list_head *head) 865 { 866 struct macvlan_dev *vlan = netdev_priv(dev); 867 868 list_del_rcu(&vlan->list); 869 unregister_netdevice_queue(dev, head); 870 netdev_upper_dev_unlink(vlan->lowerdev, dev); 871 } 872 EXPORT_SYMBOL_GPL(macvlan_dellink); 873 874 static int macvlan_changelink(struct net_device *dev, 875 struct nlattr *tb[], struct nlattr *data[]) 876 { 877 struct macvlan_dev *vlan = netdev_priv(dev); 878 enum macvlan_mode mode; 879 bool set_mode = false; 880 881 /* Validate mode, but don't set yet: setting flags may fail. */ 882 if (data && data[IFLA_MACVLAN_MODE]) { 883 set_mode = true; 884 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 885 /* Passthrough mode can't be set or cleared dynamically */ 886 if ((mode == MACVLAN_MODE_PASSTHRU) != 887 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 888 return -EINVAL; 889 } 890 891 if (data && data[IFLA_MACVLAN_FLAGS]) { 892 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 893 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 894 if (vlan->port->passthru && promisc) { 895 int err; 896 897 if (flags & MACVLAN_FLAG_NOPROMISC) 898 err = dev_set_promiscuity(vlan->lowerdev, -1); 899 else 900 err = dev_set_promiscuity(vlan->lowerdev, 1); 901 if (err < 0) 902 return err; 903 } 904 vlan->flags = flags; 905 } 906 if (set_mode) 907 vlan->mode = mode; 908 return 0; 909 } 910 911 static size_t macvlan_get_size(const struct net_device *dev) 912 { 913 return (0 914 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 915 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 916 ); 917 } 918 919 static int macvlan_fill_info(struct sk_buff *skb, 920 const struct net_device *dev) 921 { 922 struct macvlan_dev *vlan = netdev_priv(dev); 923 924 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 925 goto nla_put_failure; 926 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 927 goto nla_put_failure; 928 return 0; 929 930 nla_put_failure: 931 return -EMSGSIZE; 932 } 933 934 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 935 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 936 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 937 }; 938 939 int macvlan_link_register(struct rtnl_link_ops *ops) 940 { 941 /* common fields */ 942 ops->priv_size = sizeof(struct macvlan_dev); 943 ops->validate = macvlan_validate; 944 ops->maxtype = IFLA_MACVLAN_MAX; 945 ops->policy = macvlan_policy; 946 ops->changelink = macvlan_changelink; 947 ops->get_size = macvlan_get_size; 948 ops->fill_info = macvlan_fill_info; 949 950 return rtnl_link_register(ops); 951 }; 952 EXPORT_SYMBOL_GPL(macvlan_link_register); 953 954 static struct rtnl_link_ops macvlan_link_ops = { 955 .kind = "macvlan", 956 .setup = macvlan_setup, 957 .newlink = macvlan_newlink, 958 .dellink = macvlan_dellink, 959 }; 960 961 static int macvlan_device_event(struct notifier_block *unused, 962 unsigned long event, void *ptr) 963 { 964 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 965 struct macvlan_dev *vlan, *next; 966 struct macvlan_port *port; 967 LIST_HEAD(list_kill); 968 969 if (!macvlan_port_exists(dev)) 970 return NOTIFY_DONE; 971 972 port = macvlan_port_get_rtnl(dev); 973 974 switch (event) { 975 case NETDEV_CHANGE: 976 list_for_each_entry(vlan, &port->vlans, list) 977 netif_stacked_transfer_operstate(vlan->lowerdev, 978 vlan->dev); 979 break; 980 case NETDEV_FEAT_CHANGE: 981 list_for_each_entry(vlan, &port->vlans, list) { 982 vlan->dev->features = dev->features & MACVLAN_FEATURES; 983 vlan->dev->gso_max_size = dev->gso_max_size; 984 netdev_features_change(vlan->dev); 985 } 986 break; 987 case NETDEV_UNREGISTER: 988 /* twiddle thumbs on netns device moves */ 989 if (dev->reg_state != NETREG_UNREGISTERING) 990 break; 991 992 list_for_each_entry_safe(vlan, next, &port->vlans, list) 993 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 994 unregister_netdevice_many(&list_kill); 995 list_del(&list_kill); 996 break; 997 case NETDEV_PRE_TYPE_CHANGE: 998 /* Forbid underlaying device to change its type. */ 999 return NOTIFY_BAD; 1000 } 1001 return NOTIFY_DONE; 1002 } 1003 1004 static struct notifier_block macvlan_notifier_block __read_mostly = { 1005 .notifier_call = macvlan_device_event, 1006 }; 1007 1008 static int __init macvlan_init_module(void) 1009 { 1010 int err; 1011 1012 register_netdevice_notifier(&macvlan_notifier_block); 1013 1014 err = macvlan_link_register(&macvlan_link_ops); 1015 if (err < 0) 1016 goto err1; 1017 return 0; 1018 err1: 1019 unregister_netdevice_notifier(&macvlan_notifier_block); 1020 return err; 1021 } 1022 1023 static void __exit macvlan_cleanup_module(void) 1024 { 1025 rtnl_link_unregister(&macvlan_link_ops); 1026 unregister_netdevice_notifier(&macvlan_notifier_block); 1027 } 1028 1029 module_init(macvlan_init_module); 1030 module_exit(macvlan_cleanup_module); 1031 1032 MODULE_LICENSE("GPL"); 1033 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1034 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1035 MODULE_ALIAS_RTNL_LINK("macvlan"); 1036