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 dev_forward_skb(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 netif_rx(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 = netif_rx(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 static 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 if (vlan->fwd_priv) { 301 skb->dev = vlan->lowerdev; 302 ret = dev_hard_start_xmit(skb, skb->dev, NULL, vlan->fwd_priv); 303 } else { 304 ret = macvlan_queue_xmit(skb, dev); 305 } 306 307 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 308 struct macvlan_pcpu_stats *pcpu_stats; 309 310 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 311 u64_stats_update_begin(&pcpu_stats->syncp); 312 pcpu_stats->tx_packets++; 313 pcpu_stats->tx_bytes += len; 314 u64_stats_update_end(&pcpu_stats->syncp); 315 } else { 316 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 317 } 318 return ret; 319 } 320 321 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 322 unsigned short type, const void *daddr, 323 const void *saddr, unsigned len) 324 { 325 const struct macvlan_dev *vlan = netdev_priv(dev); 326 struct net_device *lowerdev = vlan->lowerdev; 327 328 return dev_hard_header(skb, lowerdev, type, daddr, 329 saddr ? : dev->dev_addr, len); 330 } 331 332 static const struct header_ops macvlan_hard_header_ops = { 333 .create = macvlan_hard_header, 334 .rebuild = eth_rebuild_header, 335 .parse = eth_header_parse, 336 .cache = eth_header_cache, 337 .cache_update = eth_header_cache_update, 338 }; 339 340 static int macvlan_open(struct net_device *dev) 341 { 342 struct macvlan_dev *vlan = netdev_priv(dev); 343 struct net_device *lowerdev = vlan->lowerdev; 344 int err; 345 346 if (vlan->port->passthru) { 347 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 348 err = dev_set_promiscuity(lowerdev, 1); 349 if (err < 0) 350 goto out; 351 } 352 goto hash_add; 353 } 354 355 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) { 356 vlan->fwd_priv = 357 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 358 359 /* If we get a NULL pointer back, or if we get an error 360 * then we should just fall through to the non accelerated path 361 */ 362 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 363 vlan->fwd_priv = NULL; 364 } else { 365 dev->features &= ~NETIF_F_LLTX; 366 return 0; 367 } 368 } 369 370 err = -EBUSY; 371 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 372 goto out; 373 374 err = dev_uc_add(lowerdev, dev->dev_addr); 375 if (err < 0) 376 goto out; 377 if (dev->flags & IFF_ALLMULTI) { 378 err = dev_set_allmulti(lowerdev, 1); 379 if (err < 0) 380 goto del_unicast; 381 } 382 383 hash_add: 384 macvlan_hash_add(vlan); 385 return 0; 386 387 del_unicast: 388 dev_uc_del(lowerdev, dev->dev_addr); 389 out: 390 if (vlan->fwd_priv) { 391 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 392 vlan->fwd_priv); 393 vlan->fwd_priv = NULL; 394 } 395 return err; 396 } 397 398 static int macvlan_stop(struct net_device *dev) 399 { 400 struct macvlan_dev *vlan = netdev_priv(dev); 401 struct net_device *lowerdev = vlan->lowerdev; 402 403 if (vlan->fwd_priv) { 404 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 405 vlan->fwd_priv); 406 vlan->fwd_priv = NULL; 407 return 0; 408 } 409 410 dev_uc_unsync(lowerdev, dev); 411 dev_mc_unsync(lowerdev, dev); 412 413 if (vlan->port->passthru) { 414 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 415 dev_set_promiscuity(lowerdev, -1); 416 goto hash_del; 417 } 418 419 if (dev->flags & IFF_ALLMULTI) 420 dev_set_allmulti(lowerdev, -1); 421 422 dev_uc_del(lowerdev, dev->dev_addr); 423 424 hash_del: 425 macvlan_hash_del(vlan, !dev->dismantle); 426 return 0; 427 } 428 429 static int macvlan_set_mac_address(struct net_device *dev, void *p) 430 { 431 struct macvlan_dev *vlan = netdev_priv(dev); 432 struct net_device *lowerdev = vlan->lowerdev; 433 struct sockaddr *addr = p; 434 int err; 435 436 if (!is_valid_ether_addr(addr->sa_data)) 437 return -EADDRNOTAVAIL; 438 439 if (!(dev->flags & IFF_UP)) { 440 /* Just copy in the new address */ 441 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 442 } else { 443 /* Rehash and update the device filters */ 444 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 445 return -EBUSY; 446 447 err = dev_uc_add(lowerdev, addr->sa_data); 448 if (err) 449 return err; 450 451 dev_uc_del(lowerdev, dev->dev_addr); 452 453 macvlan_hash_change_addr(vlan, addr->sa_data); 454 } 455 return 0; 456 } 457 458 static void macvlan_change_rx_flags(struct net_device *dev, int change) 459 { 460 struct macvlan_dev *vlan = netdev_priv(dev); 461 struct net_device *lowerdev = vlan->lowerdev; 462 463 if (change & IFF_ALLMULTI) 464 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 465 } 466 467 static void macvlan_set_mac_lists(struct net_device *dev) 468 { 469 struct macvlan_dev *vlan = netdev_priv(dev); 470 471 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 472 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); 473 } else { 474 struct netdev_hw_addr *ha; 475 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 476 477 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 478 netdev_for_each_mc_addr(ha, dev) { 479 __set_bit(mc_hash(vlan, ha->addr), filter); 480 } 481 482 __set_bit(mc_hash(vlan, dev->broadcast), filter); 483 484 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); 485 } 486 dev_uc_sync(vlan->lowerdev, dev); 487 dev_mc_sync(vlan->lowerdev, dev); 488 } 489 490 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 491 { 492 struct macvlan_dev *vlan = netdev_priv(dev); 493 494 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 495 return -EINVAL; 496 dev->mtu = new_mtu; 497 return 0; 498 } 499 500 /* 501 * macvlan network devices have devices nesting below it and are a special 502 * "super class" of normal network devices; split their locks off into a 503 * separate class since they always nest. 504 */ 505 static struct lock_class_key macvlan_netdev_xmit_lock_key; 506 static struct lock_class_key macvlan_netdev_addr_lock_key; 507 508 #define MACVLAN_FEATURES \ 509 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 510 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 511 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 512 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 513 514 #define MACVLAN_STATE_MASK \ 515 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 516 517 static void macvlan_set_lockdep_class_one(struct net_device *dev, 518 struct netdev_queue *txq, 519 void *_unused) 520 { 521 lockdep_set_class(&txq->_xmit_lock, 522 &macvlan_netdev_xmit_lock_key); 523 } 524 525 static void macvlan_set_lockdep_class(struct net_device *dev) 526 { 527 lockdep_set_class(&dev->addr_list_lock, 528 &macvlan_netdev_addr_lock_key); 529 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 530 } 531 532 static int macvlan_init(struct net_device *dev) 533 { 534 struct macvlan_dev *vlan = netdev_priv(dev); 535 const struct net_device *lowerdev = vlan->lowerdev; 536 int i; 537 538 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 539 (lowerdev->state & MACVLAN_STATE_MASK); 540 dev->features = lowerdev->features & MACVLAN_FEATURES; 541 dev->features |= NETIF_F_LLTX; 542 dev->gso_max_size = lowerdev->gso_max_size; 543 dev->iflink = lowerdev->ifindex; 544 dev->hard_header_len = lowerdev->hard_header_len; 545 546 macvlan_set_lockdep_class(dev); 547 548 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats); 549 if (!vlan->pcpu_stats) 550 return -ENOMEM; 551 552 for_each_possible_cpu(i) { 553 struct macvlan_pcpu_stats *mvlstats; 554 mvlstats = per_cpu_ptr(vlan->pcpu_stats, i); 555 u64_stats_init(&mvlstats->syncp); 556 } 557 558 return 0; 559 } 560 561 static void macvlan_uninit(struct net_device *dev) 562 { 563 struct macvlan_dev *vlan = netdev_priv(dev); 564 struct macvlan_port *port = vlan->port; 565 566 free_percpu(vlan->pcpu_stats); 567 568 port->count -= 1; 569 if (!port->count) 570 macvlan_port_destroy(port->dev); 571 } 572 573 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 574 struct rtnl_link_stats64 *stats) 575 { 576 struct macvlan_dev *vlan = netdev_priv(dev); 577 578 if (vlan->pcpu_stats) { 579 struct macvlan_pcpu_stats *p; 580 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 581 u32 rx_errors = 0, tx_dropped = 0; 582 unsigned int start; 583 int i; 584 585 for_each_possible_cpu(i) { 586 p = per_cpu_ptr(vlan->pcpu_stats, i); 587 do { 588 start = u64_stats_fetch_begin_bh(&p->syncp); 589 rx_packets = p->rx_packets; 590 rx_bytes = p->rx_bytes; 591 rx_multicast = p->rx_multicast; 592 tx_packets = p->tx_packets; 593 tx_bytes = p->tx_bytes; 594 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 595 596 stats->rx_packets += rx_packets; 597 stats->rx_bytes += rx_bytes; 598 stats->multicast += rx_multicast; 599 stats->tx_packets += tx_packets; 600 stats->tx_bytes += tx_bytes; 601 /* rx_errors & tx_dropped are u32, updated 602 * without syncp protection. 603 */ 604 rx_errors += p->rx_errors; 605 tx_dropped += p->tx_dropped; 606 } 607 stats->rx_errors = rx_errors; 608 stats->rx_dropped = rx_errors; 609 stats->tx_dropped = tx_dropped; 610 } 611 return stats; 612 } 613 614 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 615 __be16 proto, u16 vid) 616 { 617 struct macvlan_dev *vlan = netdev_priv(dev); 618 struct net_device *lowerdev = vlan->lowerdev; 619 620 return vlan_vid_add(lowerdev, proto, vid); 621 } 622 623 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 624 __be16 proto, u16 vid) 625 { 626 struct macvlan_dev *vlan = netdev_priv(dev); 627 struct net_device *lowerdev = vlan->lowerdev; 628 629 vlan_vid_del(lowerdev, proto, vid); 630 return 0; 631 } 632 633 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 634 struct net_device *dev, 635 const unsigned char *addr, 636 u16 flags) 637 { 638 struct macvlan_dev *vlan = netdev_priv(dev); 639 int err = -EINVAL; 640 641 if (!vlan->port->passthru) 642 return -EOPNOTSUPP; 643 644 if (flags & NLM_F_REPLACE) 645 return -EOPNOTSUPP; 646 647 if (is_unicast_ether_addr(addr)) 648 err = dev_uc_add_excl(dev, addr); 649 else if (is_multicast_ether_addr(addr)) 650 err = dev_mc_add_excl(dev, addr); 651 652 return err; 653 } 654 655 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 656 struct net_device *dev, 657 const unsigned char *addr) 658 { 659 struct macvlan_dev *vlan = netdev_priv(dev); 660 int err = -EINVAL; 661 662 if (!vlan->port->passthru) 663 return -EOPNOTSUPP; 664 665 if (is_unicast_ether_addr(addr)) 666 err = dev_uc_del(dev, addr); 667 else if (is_multicast_ether_addr(addr)) 668 err = dev_mc_del(dev, addr); 669 670 return err; 671 } 672 673 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 674 struct ethtool_drvinfo *drvinfo) 675 { 676 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 677 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 678 } 679 680 static int macvlan_ethtool_get_settings(struct net_device *dev, 681 struct ethtool_cmd *cmd) 682 { 683 const struct macvlan_dev *vlan = netdev_priv(dev); 684 685 return __ethtool_get_settings(vlan->lowerdev, cmd); 686 } 687 688 static netdev_features_t macvlan_fix_features(struct net_device *dev, 689 netdev_features_t features) 690 { 691 struct macvlan_dev *vlan = netdev_priv(dev); 692 693 return features & (vlan->set_features | ~MACVLAN_FEATURES); 694 } 695 696 static const struct ethtool_ops macvlan_ethtool_ops = { 697 .get_link = ethtool_op_get_link, 698 .get_settings = macvlan_ethtool_get_settings, 699 .get_drvinfo = macvlan_ethtool_get_drvinfo, 700 }; 701 702 static const struct net_device_ops macvlan_netdev_ops = { 703 .ndo_init = macvlan_init, 704 .ndo_uninit = macvlan_uninit, 705 .ndo_open = macvlan_open, 706 .ndo_stop = macvlan_stop, 707 .ndo_start_xmit = macvlan_start_xmit, 708 .ndo_change_mtu = macvlan_change_mtu, 709 .ndo_fix_features = macvlan_fix_features, 710 .ndo_change_rx_flags = macvlan_change_rx_flags, 711 .ndo_set_mac_address = macvlan_set_mac_address, 712 .ndo_set_rx_mode = macvlan_set_mac_lists, 713 .ndo_get_stats64 = macvlan_dev_get_stats64, 714 .ndo_validate_addr = eth_validate_addr, 715 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 716 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 717 .ndo_fdb_add = macvlan_fdb_add, 718 .ndo_fdb_del = macvlan_fdb_del, 719 .ndo_fdb_dump = ndo_dflt_fdb_dump, 720 }; 721 722 void macvlan_common_setup(struct net_device *dev) 723 { 724 ether_setup(dev); 725 726 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 727 dev->priv_flags |= IFF_UNICAST_FLT; 728 dev->netdev_ops = &macvlan_netdev_ops; 729 dev->destructor = free_netdev; 730 dev->header_ops = &macvlan_hard_header_ops; 731 dev->ethtool_ops = &macvlan_ethtool_ops; 732 } 733 EXPORT_SYMBOL_GPL(macvlan_common_setup); 734 735 static void macvlan_setup(struct net_device *dev) 736 { 737 macvlan_common_setup(dev); 738 dev->tx_queue_len = 0; 739 } 740 741 static int macvlan_port_create(struct net_device *dev) 742 { 743 struct macvlan_port *port; 744 unsigned int i; 745 int err; 746 747 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 748 return -EINVAL; 749 750 port = kzalloc(sizeof(*port), GFP_KERNEL); 751 if (port == NULL) 752 return -ENOMEM; 753 754 port->passthru = false; 755 port->dev = dev; 756 INIT_LIST_HEAD(&port->vlans); 757 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 758 INIT_HLIST_HEAD(&port->vlan_hash[i]); 759 760 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 761 if (err) 762 kfree(port); 763 else 764 dev->priv_flags |= IFF_MACVLAN_PORT; 765 return err; 766 } 767 768 static void macvlan_port_destroy(struct net_device *dev) 769 { 770 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 771 772 dev->priv_flags &= ~IFF_MACVLAN_PORT; 773 netdev_rx_handler_unregister(dev); 774 kfree_rcu(port, rcu); 775 } 776 777 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 778 { 779 if (tb[IFLA_ADDRESS]) { 780 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 781 return -EINVAL; 782 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 783 return -EADDRNOTAVAIL; 784 } 785 786 if (data && data[IFLA_MACVLAN_FLAGS] && 787 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 788 return -EINVAL; 789 790 if (data && data[IFLA_MACVLAN_MODE]) { 791 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 792 case MACVLAN_MODE_PRIVATE: 793 case MACVLAN_MODE_VEPA: 794 case MACVLAN_MODE_BRIDGE: 795 case MACVLAN_MODE_PASSTHRU: 796 break; 797 default: 798 return -EINVAL; 799 } 800 } 801 return 0; 802 } 803 804 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 805 struct nlattr *tb[], struct nlattr *data[]) 806 { 807 struct macvlan_dev *vlan = netdev_priv(dev); 808 struct macvlan_port *port; 809 struct net_device *lowerdev; 810 int err; 811 812 if (!tb[IFLA_LINK]) 813 return -EINVAL; 814 815 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 816 if (lowerdev == NULL) 817 return -ENODEV; 818 819 /* When creating macvlans or macvtaps on top of other macvlans - use 820 * the real device as the lowerdev. 821 */ 822 if (netif_is_macvlan(lowerdev)) 823 lowerdev = macvlan_dev_real_dev(lowerdev); 824 825 if (!tb[IFLA_MTU]) 826 dev->mtu = lowerdev->mtu; 827 else if (dev->mtu > lowerdev->mtu) 828 return -EINVAL; 829 830 if (!tb[IFLA_ADDRESS]) 831 eth_hw_addr_random(dev); 832 833 if (!macvlan_port_exists(lowerdev)) { 834 err = macvlan_port_create(lowerdev); 835 if (err < 0) 836 return err; 837 } 838 port = macvlan_port_get_rtnl(lowerdev); 839 840 /* Only 1 macvlan device can be created in passthru mode */ 841 if (port->passthru) 842 return -EINVAL; 843 844 vlan->lowerdev = lowerdev; 845 vlan->dev = dev; 846 vlan->port = port; 847 vlan->set_features = MACVLAN_FEATURES; 848 849 vlan->mode = MACVLAN_MODE_VEPA; 850 if (data && data[IFLA_MACVLAN_MODE]) 851 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 852 853 if (data && data[IFLA_MACVLAN_FLAGS]) 854 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 855 856 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 857 if (port->count) 858 return -EINVAL; 859 port->passthru = true; 860 eth_hw_addr_inherit(dev, lowerdev); 861 } 862 863 port->count += 1; 864 err = register_netdevice(dev); 865 if (err < 0) 866 goto destroy_port; 867 868 dev->priv_flags |= IFF_MACVLAN; 869 err = netdev_upper_dev_link(lowerdev, dev); 870 if (err) 871 goto destroy_port; 872 873 874 list_add_tail_rcu(&vlan->list, &port->vlans); 875 netif_stacked_transfer_operstate(lowerdev, dev); 876 877 return 0; 878 879 destroy_port: 880 port->count -= 1; 881 if (!port->count) 882 macvlan_port_destroy(lowerdev); 883 884 return err; 885 } 886 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 887 888 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 889 struct nlattr *tb[], struct nlattr *data[]) 890 { 891 return macvlan_common_newlink(src_net, dev, tb, data); 892 } 893 894 void macvlan_dellink(struct net_device *dev, struct list_head *head) 895 { 896 struct macvlan_dev *vlan = netdev_priv(dev); 897 898 list_del_rcu(&vlan->list); 899 unregister_netdevice_queue(dev, head); 900 netdev_upper_dev_unlink(vlan->lowerdev, dev); 901 } 902 EXPORT_SYMBOL_GPL(macvlan_dellink); 903 904 static int macvlan_changelink(struct net_device *dev, 905 struct nlattr *tb[], struct nlattr *data[]) 906 { 907 struct macvlan_dev *vlan = netdev_priv(dev); 908 enum macvlan_mode mode; 909 bool set_mode = false; 910 911 /* Validate mode, but don't set yet: setting flags may fail. */ 912 if (data && data[IFLA_MACVLAN_MODE]) { 913 set_mode = true; 914 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 915 /* Passthrough mode can't be set or cleared dynamically */ 916 if ((mode == MACVLAN_MODE_PASSTHRU) != 917 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 918 return -EINVAL; 919 } 920 921 if (data && data[IFLA_MACVLAN_FLAGS]) { 922 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 923 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 924 if (vlan->port->passthru && promisc) { 925 int err; 926 927 if (flags & MACVLAN_FLAG_NOPROMISC) 928 err = dev_set_promiscuity(vlan->lowerdev, -1); 929 else 930 err = dev_set_promiscuity(vlan->lowerdev, 1); 931 if (err < 0) 932 return err; 933 } 934 vlan->flags = flags; 935 } 936 if (set_mode) 937 vlan->mode = mode; 938 return 0; 939 } 940 941 static size_t macvlan_get_size(const struct net_device *dev) 942 { 943 return (0 944 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 945 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 946 ); 947 } 948 949 static int macvlan_fill_info(struct sk_buff *skb, 950 const struct net_device *dev) 951 { 952 struct macvlan_dev *vlan = netdev_priv(dev); 953 954 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 955 goto nla_put_failure; 956 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 957 goto nla_put_failure; 958 return 0; 959 960 nla_put_failure: 961 return -EMSGSIZE; 962 } 963 964 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 965 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 966 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 967 }; 968 969 int macvlan_link_register(struct rtnl_link_ops *ops) 970 { 971 /* common fields */ 972 ops->priv_size = sizeof(struct macvlan_dev); 973 ops->validate = macvlan_validate; 974 ops->maxtype = IFLA_MACVLAN_MAX; 975 ops->policy = macvlan_policy; 976 ops->changelink = macvlan_changelink; 977 ops->get_size = macvlan_get_size; 978 ops->fill_info = macvlan_fill_info; 979 980 return rtnl_link_register(ops); 981 }; 982 EXPORT_SYMBOL_GPL(macvlan_link_register); 983 984 static struct rtnl_link_ops macvlan_link_ops = { 985 .kind = "macvlan", 986 .setup = macvlan_setup, 987 .newlink = macvlan_newlink, 988 .dellink = macvlan_dellink, 989 }; 990 991 static int macvlan_device_event(struct notifier_block *unused, 992 unsigned long event, void *ptr) 993 { 994 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 995 struct macvlan_dev *vlan, *next; 996 struct macvlan_port *port; 997 LIST_HEAD(list_kill); 998 999 if (!macvlan_port_exists(dev)) 1000 return NOTIFY_DONE; 1001 1002 port = macvlan_port_get_rtnl(dev); 1003 1004 switch (event) { 1005 case NETDEV_CHANGE: 1006 list_for_each_entry(vlan, &port->vlans, list) 1007 netif_stacked_transfer_operstate(vlan->lowerdev, 1008 vlan->dev); 1009 break; 1010 case NETDEV_FEAT_CHANGE: 1011 list_for_each_entry(vlan, &port->vlans, list) { 1012 vlan->dev->features = dev->features & MACVLAN_FEATURES; 1013 vlan->dev->gso_max_size = dev->gso_max_size; 1014 netdev_features_change(vlan->dev); 1015 } 1016 break; 1017 case NETDEV_UNREGISTER: 1018 /* twiddle thumbs on netns device moves */ 1019 if (dev->reg_state != NETREG_UNREGISTERING) 1020 break; 1021 1022 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1023 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1024 unregister_netdevice_many(&list_kill); 1025 list_del(&list_kill); 1026 break; 1027 case NETDEV_PRE_TYPE_CHANGE: 1028 /* Forbid underlaying device to change its type. */ 1029 return NOTIFY_BAD; 1030 } 1031 return NOTIFY_DONE; 1032 } 1033 1034 static struct notifier_block macvlan_notifier_block __read_mostly = { 1035 .notifier_call = macvlan_device_event, 1036 }; 1037 1038 static int __init macvlan_init_module(void) 1039 { 1040 int err; 1041 1042 register_netdevice_notifier(&macvlan_notifier_block); 1043 1044 err = macvlan_link_register(&macvlan_link_ops); 1045 if (err < 0) 1046 goto err1; 1047 return 0; 1048 err1: 1049 unregister_netdevice_notifier(&macvlan_notifier_block); 1050 return err; 1051 } 1052 1053 static void __exit macvlan_cleanup_module(void) 1054 { 1055 rtnl_link_unregister(&macvlan_link_ops); 1056 unregister_netdevice_notifier(&macvlan_notifier_block); 1057 } 1058 1059 module_init(macvlan_init_module); 1060 module_exit(macvlan_cleanup_module); 1061 1062 MODULE_LICENSE("GPL"); 1063 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1064 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1065 MODULE_ALIAS_RTNL_LINK("macvlan"); 1066