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_queue_xmit_accel(skb, 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 vlan_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 struct rtnl_link_ops macvlan_link_ops; 341 342 static int macvlan_open(struct net_device *dev) 343 { 344 struct macvlan_dev *vlan = netdev_priv(dev); 345 struct net_device *lowerdev = vlan->lowerdev; 346 int err; 347 348 if (vlan->port->passthru) { 349 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 350 err = dev_set_promiscuity(lowerdev, 1); 351 if (err < 0) 352 goto out; 353 } 354 goto hash_add; 355 } 356 357 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && 358 dev->rtnl_link_ops == &macvlan_link_ops) { 359 vlan->fwd_priv = 360 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 361 362 /* If we get a NULL pointer back, or if we get an error 363 * then we should just fall through to the non accelerated path 364 */ 365 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 366 vlan->fwd_priv = NULL; 367 } else 368 return 0; 369 } 370 371 err = -EBUSY; 372 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 373 goto out; 374 375 err = dev_uc_add(lowerdev, dev->dev_addr); 376 if (err < 0) 377 goto out; 378 if (dev->flags & IFF_ALLMULTI) { 379 err = dev_set_allmulti(lowerdev, 1); 380 if (err < 0) 381 goto del_unicast; 382 } 383 384 hash_add: 385 macvlan_hash_add(vlan); 386 return 0; 387 388 del_unicast: 389 dev_uc_del(lowerdev, dev->dev_addr); 390 out: 391 if (vlan->fwd_priv) { 392 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 393 vlan->fwd_priv); 394 vlan->fwd_priv = NULL; 395 } 396 return err; 397 } 398 399 static int macvlan_stop(struct net_device *dev) 400 { 401 struct macvlan_dev *vlan = netdev_priv(dev); 402 struct net_device *lowerdev = vlan->lowerdev; 403 404 if (vlan->fwd_priv) { 405 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 406 vlan->fwd_priv); 407 vlan->fwd_priv = NULL; 408 return 0; 409 } 410 411 dev_uc_unsync(lowerdev, dev); 412 dev_mc_unsync(lowerdev, dev); 413 414 if (vlan->port->passthru) { 415 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 416 dev_set_promiscuity(lowerdev, -1); 417 goto hash_del; 418 } 419 420 if (dev->flags & IFF_ALLMULTI) 421 dev_set_allmulti(lowerdev, -1); 422 423 dev_uc_del(lowerdev, dev->dev_addr); 424 425 hash_del: 426 macvlan_hash_del(vlan, !dev->dismantle); 427 return 0; 428 } 429 430 static int macvlan_set_mac_address(struct net_device *dev, void *p) 431 { 432 struct macvlan_dev *vlan = netdev_priv(dev); 433 struct net_device *lowerdev = vlan->lowerdev; 434 struct sockaddr *addr = p; 435 int err; 436 437 if (!is_valid_ether_addr(addr->sa_data)) 438 return -EADDRNOTAVAIL; 439 440 if (!(dev->flags & IFF_UP)) { 441 /* Just copy in the new address */ 442 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 443 } else { 444 /* Rehash and update the device filters */ 445 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 446 return -EBUSY; 447 448 err = dev_uc_add(lowerdev, addr->sa_data); 449 if (err) 450 return err; 451 452 dev_uc_del(lowerdev, dev->dev_addr); 453 454 macvlan_hash_change_addr(vlan, addr->sa_data); 455 } 456 return 0; 457 } 458 459 static void macvlan_change_rx_flags(struct net_device *dev, int change) 460 { 461 struct macvlan_dev *vlan = netdev_priv(dev); 462 struct net_device *lowerdev = vlan->lowerdev; 463 464 if (change & IFF_ALLMULTI) 465 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 466 } 467 468 static void macvlan_set_mac_lists(struct net_device *dev) 469 { 470 struct macvlan_dev *vlan = netdev_priv(dev); 471 472 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 473 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); 474 } else { 475 struct netdev_hw_addr *ha; 476 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 477 478 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 479 netdev_for_each_mc_addr(ha, dev) { 480 __set_bit(mc_hash(vlan, ha->addr), filter); 481 } 482 483 __set_bit(mc_hash(vlan, dev->broadcast), filter); 484 485 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); 486 } 487 dev_uc_sync(vlan->lowerdev, dev); 488 dev_mc_sync(vlan->lowerdev, dev); 489 } 490 491 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 492 { 493 struct macvlan_dev *vlan = netdev_priv(dev); 494 495 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 496 return -EINVAL; 497 dev->mtu = new_mtu; 498 return 0; 499 } 500 501 /* 502 * macvlan network devices have devices nesting below it and are a special 503 * "super class" of normal network devices; split their locks off into a 504 * separate class since they always nest. 505 */ 506 static struct lock_class_key macvlan_netdev_xmit_lock_key; 507 static struct lock_class_key macvlan_netdev_addr_lock_key; 508 509 #define MACVLAN_FEATURES \ 510 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 511 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 512 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 513 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 514 515 #define MACVLAN_STATE_MASK \ 516 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 517 518 static void macvlan_set_lockdep_class_one(struct net_device *dev, 519 struct netdev_queue *txq, 520 void *_unused) 521 { 522 lockdep_set_class(&txq->_xmit_lock, 523 &macvlan_netdev_xmit_lock_key); 524 } 525 526 static void macvlan_set_lockdep_class(struct net_device *dev) 527 { 528 lockdep_set_class(&dev->addr_list_lock, 529 &macvlan_netdev_addr_lock_key); 530 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 531 } 532 533 static int macvlan_init(struct net_device *dev) 534 { 535 struct macvlan_dev *vlan = netdev_priv(dev); 536 const struct net_device *lowerdev = vlan->lowerdev; 537 int i; 538 539 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 540 (lowerdev->state & MACVLAN_STATE_MASK); 541 dev->features = lowerdev->features & MACVLAN_FEATURES; 542 dev->features |= NETIF_F_LLTX; 543 dev->gso_max_size = lowerdev->gso_max_size; 544 dev->iflink = lowerdev->ifindex; 545 dev->hard_header_len = lowerdev->hard_header_len; 546 547 macvlan_set_lockdep_class(dev); 548 549 vlan->pcpu_stats = alloc_percpu(struct vlan_pcpu_stats); 550 if (!vlan->pcpu_stats) 551 return -ENOMEM; 552 553 for_each_possible_cpu(i) { 554 struct vlan_pcpu_stats *mvlstats; 555 mvlstats = per_cpu_ptr(vlan->pcpu_stats, i); 556 u64_stats_init(&mvlstats->syncp); 557 } 558 559 return 0; 560 } 561 562 static void macvlan_uninit(struct net_device *dev) 563 { 564 struct macvlan_dev *vlan = netdev_priv(dev); 565 struct macvlan_port *port = vlan->port; 566 567 free_percpu(vlan->pcpu_stats); 568 569 port->count -= 1; 570 if (!port->count) 571 macvlan_port_destroy(port->dev); 572 } 573 574 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 575 struct rtnl_link_stats64 *stats) 576 { 577 struct macvlan_dev *vlan = netdev_priv(dev); 578 579 if (vlan->pcpu_stats) { 580 struct vlan_pcpu_stats *p; 581 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 582 u32 rx_errors = 0, tx_dropped = 0; 583 unsigned int start; 584 int i; 585 586 for_each_possible_cpu(i) { 587 p = per_cpu_ptr(vlan->pcpu_stats, i); 588 do { 589 start = u64_stats_fetch_begin_bh(&p->syncp); 590 rx_packets = p->rx_packets; 591 rx_bytes = p->rx_bytes; 592 rx_multicast = p->rx_multicast; 593 tx_packets = p->tx_packets; 594 tx_bytes = p->tx_bytes; 595 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 596 597 stats->rx_packets += rx_packets; 598 stats->rx_bytes += rx_bytes; 599 stats->multicast += rx_multicast; 600 stats->tx_packets += tx_packets; 601 stats->tx_bytes += tx_bytes; 602 /* rx_errors & tx_dropped are u32, updated 603 * without syncp protection. 604 */ 605 rx_errors += p->rx_errors; 606 tx_dropped += p->tx_dropped; 607 } 608 stats->rx_errors = rx_errors; 609 stats->rx_dropped = rx_errors; 610 stats->tx_dropped = tx_dropped; 611 } 612 return stats; 613 } 614 615 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 616 __be16 proto, u16 vid) 617 { 618 struct macvlan_dev *vlan = netdev_priv(dev); 619 struct net_device *lowerdev = vlan->lowerdev; 620 621 return vlan_vid_add(lowerdev, proto, vid); 622 } 623 624 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 625 __be16 proto, u16 vid) 626 { 627 struct macvlan_dev *vlan = netdev_priv(dev); 628 struct net_device *lowerdev = vlan->lowerdev; 629 630 vlan_vid_del(lowerdev, proto, vid); 631 return 0; 632 } 633 634 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 635 struct net_device *dev, 636 const unsigned char *addr, 637 u16 flags) 638 { 639 struct macvlan_dev *vlan = netdev_priv(dev); 640 int err = -EINVAL; 641 642 if (!vlan->port->passthru) 643 return -EOPNOTSUPP; 644 645 if (flags & NLM_F_REPLACE) 646 return -EOPNOTSUPP; 647 648 if (is_unicast_ether_addr(addr)) 649 err = dev_uc_add_excl(dev, addr); 650 else if (is_multicast_ether_addr(addr)) 651 err = dev_mc_add_excl(dev, addr); 652 653 return err; 654 } 655 656 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 657 struct net_device *dev, 658 const unsigned char *addr) 659 { 660 struct macvlan_dev *vlan = netdev_priv(dev); 661 int err = -EINVAL; 662 663 if (!vlan->port->passthru) 664 return -EOPNOTSUPP; 665 666 if (is_unicast_ether_addr(addr)) 667 err = dev_uc_del(dev, addr); 668 else if (is_multicast_ether_addr(addr)) 669 err = dev_mc_del(dev, addr); 670 671 return err; 672 } 673 674 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 675 struct ethtool_drvinfo *drvinfo) 676 { 677 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 678 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 679 } 680 681 static int macvlan_ethtool_get_settings(struct net_device *dev, 682 struct ethtool_cmd *cmd) 683 { 684 const struct macvlan_dev *vlan = netdev_priv(dev); 685 686 return __ethtool_get_settings(vlan->lowerdev, cmd); 687 } 688 689 static netdev_features_t macvlan_fix_features(struct net_device *dev, 690 netdev_features_t features) 691 { 692 struct macvlan_dev *vlan = netdev_priv(dev); 693 netdev_features_t mask; 694 695 features |= NETIF_F_ALL_FOR_ALL; 696 features &= (vlan->set_features | ~MACVLAN_FEATURES); 697 mask = features; 698 699 features = netdev_increment_features(vlan->lowerdev->features, 700 features, 701 mask); 702 features |= NETIF_F_LLTX; 703 704 return features; 705 } 706 707 static const struct ethtool_ops macvlan_ethtool_ops = { 708 .get_link = ethtool_op_get_link, 709 .get_settings = macvlan_ethtool_get_settings, 710 .get_drvinfo = macvlan_ethtool_get_drvinfo, 711 }; 712 713 static const struct net_device_ops macvlan_netdev_ops = { 714 .ndo_init = macvlan_init, 715 .ndo_uninit = macvlan_uninit, 716 .ndo_open = macvlan_open, 717 .ndo_stop = macvlan_stop, 718 .ndo_start_xmit = macvlan_start_xmit, 719 .ndo_change_mtu = macvlan_change_mtu, 720 .ndo_fix_features = macvlan_fix_features, 721 .ndo_change_rx_flags = macvlan_change_rx_flags, 722 .ndo_set_mac_address = macvlan_set_mac_address, 723 .ndo_set_rx_mode = macvlan_set_mac_lists, 724 .ndo_get_stats64 = macvlan_dev_get_stats64, 725 .ndo_validate_addr = eth_validate_addr, 726 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 727 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 728 .ndo_fdb_add = macvlan_fdb_add, 729 .ndo_fdb_del = macvlan_fdb_del, 730 .ndo_fdb_dump = ndo_dflt_fdb_dump, 731 }; 732 733 void macvlan_common_setup(struct net_device *dev) 734 { 735 ether_setup(dev); 736 737 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 738 dev->priv_flags |= IFF_UNICAST_FLT; 739 dev->netdev_ops = &macvlan_netdev_ops; 740 dev->destructor = free_netdev; 741 dev->header_ops = &macvlan_hard_header_ops; 742 dev->ethtool_ops = &macvlan_ethtool_ops; 743 } 744 EXPORT_SYMBOL_GPL(macvlan_common_setup); 745 746 static void macvlan_setup(struct net_device *dev) 747 { 748 macvlan_common_setup(dev); 749 dev->tx_queue_len = 0; 750 } 751 752 static int macvlan_port_create(struct net_device *dev) 753 { 754 struct macvlan_port *port; 755 unsigned int i; 756 int err; 757 758 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 759 return -EINVAL; 760 761 port = kzalloc(sizeof(*port), GFP_KERNEL); 762 if (port == NULL) 763 return -ENOMEM; 764 765 port->passthru = false; 766 port->dev = dev; 767 INIT_LIST_HEAD(&port->vlans); 768 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 769 INIT_HLIST_HEAD(&port->vlan_hash[i]); 770 771 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 772 if (err) 773 kfree(port); 774 else 775 dev->priv_flags |= IFF_MACVLAN_PORT; 776 return err; 777 } 778 779 static void macvlan_port_destroy(struct net_device *dev) 780 { 781 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 782 783 dev->priv_flags &= ~IFF_MACVLAN_PORT; 784 netdev_rx_handler_unregister(dev); 785 kfree_rcu(port, rcu); 786 } 787 788 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 789 { 790 if (tb[IFLA_ADDRESS]) { 791 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 792 return -EINVAL; 793 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 794 return -EADDRNOTAVAIL; 795 } 796 797 if (data && data[IFLA_MACVLAN_FLAGS] && 798 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 799 return -EINVAL; 800 801 if (data && data[IFLA_MACVLAN_MODE]) { 802 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 803 case MACVLAN_MODE_PRIVATE: 804 case MACVLAN_MODE_VEPA: 805 case MACVLAN_MODE_BRIDGE: 806 case MACVLAN_MODE_PASSTHRU: 807 break; 808 default: 809 return -EINVAL; 810 } 811 } 812 return 0; 813 } 814 815 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 816 struct nlattr *tb[], struct nlattr *data[]) 817 { 818 struct macvlan_dev *vlan = netdev_priv(dev); 819 struct macvlan_port *port; 820 struct net_device *lowerdev; 821 int err; 822 823 if (!tb[IFLA_LINK]) 824 return -EINVAL; 825 826 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 827 if (lowerdev == NULL) 828 return -ENODEV; 829 830 /* When creating macvlans or macvtaps on top of other macvlans - use 831 * the real device as the lowerdev. 832 */ 833 if (netif_is_macvlan(lowerdev)) 834 lowerdev = macvlan_dev_real_dev(lowerdev); 835 836 if (!tb[IFLA_MTU]) 837 dev->mtu = lowerdev->mtu; 838 else if (dev->mtu > lowerdev->mtu) 839 return -EINVAL; 840 841 if (!tb[IFLA_ADDRESS]) 842 eth_hw_addr_random(dev); 843 844 if (!macvlan_port_exists(lowerdev)) { 845 err = macvlan_port_create(lowerdev); 846 if (err < 0) 847 return err; 848 } 849 port = macvlan_port_get_rtnl(lowerdev); 850 851 /* Only 1 macvlan device can be created in passthru mode */ 852 if (port->passthru) 853 return -EINVAL; 854 855 vlan->lowerdev = lowerdev; 856 vlan->dev = dev; 857 vlan->port = port; 858 vlan->set_features = MACVLAN_FEATURES; 859 860 vlan->mode = MACVLAN_MODE_VEPA; 861 if (data && data[IFLA_MACVLAN_MODE]) 862 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 863 864 if (data && data[IFLA_MACVLAN_FLAGS]) 865 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 866 867 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 868 if (port->count) 869 return -EINVAL; 870 port->passthru = true; 871 eth_hw_addr_inherit(dev, lowerdev); 872 } 873 874 port->count += 1; 875 err = register_netdevice(dev); 876 if (err < 0) 877 goto destroy_port; 878 879 dev->priv_flags |= IFF_MACVLAN; 880 err = netdev_upper_dev_link(lowerdev, dev); 881 if (err) 882 goto destroy_port; 883 884 885 list_add_tail_rcu(&vlan->list, &port->vlans); 886 netif_stacked_transfer_operstate(lowerdev, dev); 887 888 return 0; 889 890 destroy_port: 891 port->count -= 1; 892 if (!port->count) 893 macvlan_port_destroy(lowerdev); 894 895 return err; 896 } 897 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 898 899 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 900 struct nlattr *tb[], struct nlattr *data[]) 901 { 902 return macvlan_common_newlink(src_net, dev, tb, data); 903 } 904 905 void macvlan_dellink(struct net_device *dev, struct list_head *head) 906 { 907 struct macvlan_dev *vlan = netdev_priv(dev); 908 909 list_del_rcu(&vlan->list); 910 unregister_netdevice_queue(dev, head); 911 netdev_upper_dev_unlink(vlan->lowerdev, dev); 912 } 913 EXPORT_SYMBOL_GPL(macvlan_dellink); 914 915 static int macvlan_changelink(struct net_device *dev, 916 struct nlattr *tb[], struct nlattr *data[]) 917 { 918 struct macvlan_dev *vlan = netdev_priv(dev); 919 enum macvlan_mode mode; 920 bool set_mode = false; 921 922 /* Validate mode, but don't set yet: setting flags may fail. */ 923 if (data && data[IFLA_MACVLAN_MODE]) { 924 set_mode = true; 925 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 926 /* Passthrough mode can't be set or cleared dynamically */ 927 if ((mode == MACVLAN_MODE_PASSTHRU) != 928 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 929 return -EINVAL; 930 } 931 932 if (data && data[IFLA_MACVLAN_FLAGS]) { 933 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 934 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 935 if (vlan->port->passthru && promisc) { 936 int err; 937 938 if (flags & MACVLAN_FLAG_NOPROMISC) 939 err = dev_set_promiscuity(vlan->lowerdev, -1); 940 else 941 err = dev_set_promiscuity(vlan->lowerdev, 1); 942 if (err < 0) 943 return err; 944 } 945 vlan->flags = flags; 946 } 947 if (set_mode) 948 vlan->mode = mode; 949 return 0; 950 } 951 952 static size_t macvlan_get_size(const struct net_device *dev) 953 { 954 return (0 955 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 956 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 957 ); 958 } 959 960 static int macvlan_fill_info(struct sk_buff *skb, 961 const struct net_device *dev) 962 { 963 struct macvlan_dev *vlan = netdev_priv(dev); 964 965 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 966 goto nla_put_failure; 967 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 968 goto nla_put_failure; 969 return 0; 970 971 nla_put_failure: 972 return -EMSGSIZE; 973 } 974 975 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 976 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 977 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 978 }; 979 980 int macvlan_link_register(struct rtnl_link_ops *ops) 981 { 982 /* common fields */ 983 ops->priv_size = sizeof(struct macvlan_dev); 984 ops->validate = macvlan_validate; 985 ops->maxtype = IFLA_MACVLAN_MAX; 986 ops->policy = macvlan_policy; 987 ops->changelink = macvlan_changelink; 988 ops->get_size = macvlan_get_size; 989 ops->fill_info = macvlan_fill_info; 990 991 return rtnl_link_register(ops); 992 }; 993 EXPORT_SYMBOL_GPL(macvlan_link_register); 994 995 static struct rtnl_link_ops macvlan_link_ops = { 996 .kind = "macvlan", 997 .setup = macvlan_setup, 998 .newlink = macvlan_newlink, 999 .dellink = macvlan_dellink, 1000 }; 1001 1002 static int macvlan_device_event(struct notifier_block *unused, 1003 unsigned long event, void *ptr) 1004 { 1005 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1006 struct macvlan_dev *vlan, *next; 1007 struct macvlan_port *port; 1008 LIST_HEAD(list_kill); 1009 1010 if (!macvlan_port_exists(dev)) 1011 return NOTIFY_DONE; 1012 1013 port = macvlan_port_get_rtnl(dev); 1014 1015 switch (event) { 1016 case NETDEV_CHANGE: 1017 list_for_each_entry(vlan, &port->vlans, list) 1018 netif_stacked_transfer_operstate(vlan->lowerdev, 1019 vlan->dev); 1020 break; 1021 case NETDEV_FEAT_CHANGE: 1022 list_for_each_entry(vlan, &port->vlans, list) { 1023 vlan->dev->gso_max_size = dev->gso_max_size; 1024 netdev_update_features(vlan->dev); 1025 } 1026 break; 1027 case NETDEV_UNREGISTER: 1028 /* twiddle thumbs on netns device moves */ 1029 if (dev->reg_state != NETREG_UNREGISTERING) 1030 break; 1031 1032 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1033 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1034 unregister_netdevice_many(&list_kill); 1035 list_del(&list_kill); 1036 break; 1037 case NETDEV_PRE_TYPE_CHANGE: 1038 /* Forbid underlaying device to change its type. */ 1039 return NOTIFY_BAD; 1040 } 1041 return NOTIFY_DONE; 1042 } 1043 1044 static struct notifier_block macvlan_notifier_block __read_mostly = { 1045 .notifier_call = macvlan_device_event, 1046 }; 1047 1048 static int __init macvlan_init_module(void) 1049 { 1050 int err; 1051 1052 register_netdevice_notifier(&macvlan_notifier_block); 1053 1054 err = macvlan_link_register(&macvlan_link_ops); 1055 if (err < 0) 1056 goto err1; 1057 return 0; 1058 err1: 1059 unregister_netdevice_notifier(&macvlan_notifier_block); 1060 return err; 1061 } 1062 1063 static void __exit macvlan_cleanup_module(void) 1064 { 1065 rtnl_link_unregister(&macvlan_link_ops); 1066 unregister_netdevice_notifier(&macvlan_notifier_block); 1067 } 1068 1069 module_init(macvlan_init_module); 1070 module_exit(macvlan_cleanup_module); 1071 1072 MODULE_LICENSE("GPL"); 1073 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1074 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1075 MODULE_ALIAS_RTNL_LINK("macvlan"); 1076