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 <linux/workqueue.h> 34 #include <net/rtnetlink.h> 35 #include <net/xfrm.h> 36 #include <linux/netpoll.h> 37 38 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE) 39 40 struct macvlan_port { 41 struct net_device *dev; 42 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 43 struct list_head vlans; 44 struct rcu_head rcu; 45 struct sk_buff_head bc_queue; 46 struct work_struct bc_work; 47 bool passthru; 48 }; 49 50 #define MACVLAN_PORT_IS_EMPTY(port) list_empty(&port->vlans) 51 52 struct macvlan_skb_cb { 53 const struct macvlan_dev *src; 54 }; 55 56 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 57 58 static void macvlan_port_destroy(struct net_device *dev); 59 60 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 61 { 62 return rcu_dereference(dev->rx_handler_data); 63 } 64 65 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 66 { 67 return rtnl_dereference(dev->rx_handler_data); 68 } 69 70 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 71 72 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 73 const unsigned char *addr) 74 { 75 struct macvlan_dev *vlan; 76 77 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) { 78 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 79 return vlan; 80 } 81 return NULL; 82 } 83 84 static void macvlan_hash_add(struct macvlan_dev *vlan) 85 { 86 struct macvlan_port *port = vlan->port; 87 const unsigned char *addr = vlan->dev->dev_addr; 88 89 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); 90 } 91 92 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 93 { 94 hlist_del_rcu(&vlan->hlist); 95 if (sync) 96 synchronize_rcu(); 97 } 98 99 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 100 const unsigned char *addr) 101 { 102 macvlan_hash_del(vlan, true); 103 /* Now that we are unhashed it is safe to change the device 104 * address without confusing packet delivery. 105 */ 106 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 107 macvlan_hash_add(vlan); 108 } 109 110 static int macvlan_addr_busy(const struct macvlan_port *port, 111 const unsigned char *addr) 112 { 113 /* Test to see if the specified multicast address is 114 * currently in use by the underlying device or 115 * another macvlan. 116 */ 117 if (ether_addr_equal_64bits(port->dev->dev_addr, addr)) 118 return 1; 119 120 if (macvlan_hash_lookup(port, addr)) 121 return 1; 122 123 return 0; 124 } 125 126 127 static int macvlan_broadcast_one(struct sk_buff *skb, 128 const struct macvlan_dev *vlan, 129 const struct ethhdr *eth, bool local) 130 { 131 struct net_device *dev = vlan->dev; 132 133 if (local) 134 return __dev_forward_skb(dev, skb); 135 136 skb->dev = dev; 137 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 138 skb->pkt_type = PACKET_BROADCAST; 139 else 140 skb->pkt_type = PACKET_MULTICAST; 141 142 return 0; 143 } 144 145 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 146 { 147 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 148 } 149 150 151 static unsigned int mc_hash(const struct macvlan_dev *vlan, 152 const unsigned char *addr) 153 { 154 u32 val = __get_unaligned_cpu32(addr + 2); 155 156 val ^= macvlan_hash_mix(vlan); 157 return hash_32(val, MACVLAN_MC_FILTER_BITS); 158 } 159 160 static void macvlan_broadcast(struct sk_buff *skb, 161 const struct macvlan_port *port, 162 struct net_device *src, 163 enum macvlan_mode mode) 164 { 165 const struct ethhdr *eth = eth_hdr(skb); 166 const struct macvlan_dev *vlan; 167 struct sk_buff *nskb; 168 unsigned int i; 169 int err; 170 unsigned int hash; 171 172 if (skb->protocol == htons(ETH_P_PAUSE)) 173 return; 174 175 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 176 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 177 if (vlan->dev == src || !(vlan->mode & mode)) 178 continue; 179 180 hash = mc_hash(vlan, eth->h_dest); 181 if (!test_bit(hash, vlan->mc_filter)) 182 continue; 183 184 err = NET_RX_DROP; 185 nskb = skb_clone(skb, GFP_ATOMIC); 186 if (likely(nskb)) 187 err = macvlan_broadcast_one( 188 nskb, vlan, eth, 189 mode == MACVLAN_MODE_BRIDGE) ?: 190 netif_rx_ni(nskb); 191 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 192 err == NET_RX_SUCCESS, 1); 193 } 194 } 195 } 196 197 static void macvlan_process_broadcast(struct work_struct *w) 198 { 199 struct macvlan_port *port = container_of(w, struct macvlan_port, 200 bc_work); 201 struct sk_buff *skb; 202 struct sk_buff_head list; 203 204 skb_queue_head_init(&list); 205 206 spin_lock_bh(&port->bc_queue.lock); 207 skb_queue_splice_tail_init(&port->bc_queue, &list); 208 spin_unlock_bh(&port->bc_queue.lock); 209 210 while ((skb = __skb_dequeue(&list))) { 211 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 212 213 rcu_read_lock(); 214 215 if (!src) 216 /* frame comes from an external address */ 217 macvlan_broadcast(skb, port, NULL, 218 MACVLAN_MODE_PRIVATE | 219 MACVLAN_MODE_VEPA | 220 MACVLAN_MODE_PASSTHRU| 221 MACVLAN_MODE_BRIDGE); 222 else if (src->mode == MACVLAN_MODE_VEPA) 223 /* flood to everyone except source */ 224 macvlan_broadcast(skb, port, src->dev, 225 MACVLAN_MODE_VEPA | 226 MACVLAN_MODE_BRIDGE); 227 else 228 /* 229 * flood only to VEPA ports, bridge ports 230 * already saw the frame on the way out. 231 */ 232 macvlan_broadcast(skb, port, src->dev, 233 MACVLAN_MODE_VEPA); 234 235 rcu_read_unlock(); 236 237 kfree_skb(skb); 238 } 239 } 240 241 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 242 struct sk_buff *skb) 243 { 244 struct sk_buff *nskb; 245 int err = -ENOMEM; 246 247 nskb = skb_clone(skb, GFP_ATOMIC); 248 if (!nskb) 249 goto err; 250 251 spin_lock(&port->bc_queue.lock); 252 if (skb_queue_len(&port->bc_queue) < skb->dev->tx_queue_len) { 253 __skb_queue_tail(&port->bc_queue, nskb); 254 err = 0; 255 } 256 spin_unlock(&port->bc_queue.lock); 257 258 if (err) 259 goto free_nskb; 260 261 schedule_work(&port->bc_work); 262 return; 263 264 free_nskb: 265 kfree_skb(nskb); 266 err: 267 atomic_long_inc(&skb->dev->rx_dropped); 268 } 269 270 /* called under rcu_read_lock() from netif_receive_skb */ 271 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 272 { 273 struct macvlan_port *port; 274 struct sk_buff *skb = *pskb; 275 const struct ethhdr *eth = eth_hdr(skb); 276 const struct macvlan_dev *vlan; 277 const struct macvlan_dev *src; 278 struct net_device *dev; 279 unsigned int len = 0; 280 int ret = NET_RX_DROP; 281 282 port = macvlan_port_get_rcu(skb->dev); 283 if (is_multicast_ether_addr(eth->h_dest)) { 284 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN); 285 if (!skb) 286 return RX_HANDLER_CONSUMED; 287 eth = eth_hdr(skb); 288 src = macvlan_hash_lookup(port, eth->h_source); 289 if (src && src->mode != MACVLAN_MODE_VEPA && 290 src->mode != MACVLAN_MODE_BRIDGE) { 291 /* forward to original port. */ 292 vlan = src; 293 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 294 netif_rx(skb); 295 goto out; 296 } 297 298 MACVLAN_SKB_CB(skb)->src = src; 299 macvlan_broadcast_enqueue(port, skb); 300 301 return RX_HANDLER_PASS; 302 } 303 304 if (port->passthru) 305 vlan = list_first_or_null_rcu(&port->vlans, 306 struct macvlan_dev, list); 307 else 308 vlan = macvlan_hash_lookup(port, eth->h_dest); 309 if (vlan == NULL) 310 return RX_HANDLER_PASS; 311 312 dev = vlan->dev; 313 if (unlikely(!(dev->flags & IFF_UP))) { 314 kfree_skb(skb); 315 return RX_HANDLER_CONSUMED; 316 } 317 len = skb->len + ETH_HLEN; 318 skb = skb_share_check(skb, GFP_ATOMIC); 319 if (!skb) 320 goto out; 321 322 skb->dev = dev; 323 skb->pkt_type = PACKET_HOST; 324 325 ret = netif_rx(skb); 326 327 out: 328 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); 329 return RX_HANDLER_CONSUMED; 330 } 331 332 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 333 { 334 const struct macvlan_dev *vlan = netdev_priv(dev); 335 const struct macvlan_port *port = vlan->port; 336 const struct macvlan_dev *dest; 337 338 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 339 const struct ethhdr *eth = (void *)skb->data; 340 341 /* send to other bridge ports directly */ 342 if (is_multicast_ether_addr(eth->h_dest)) { 343 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 344 goto xmit_world; 345 } 346 347 dest = macvlan_hash_lookup(port, eth->h_dest); 348 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 349 /* send to lowerdev first for its network taps */ 350 dev_forward_skb(vlan->lowerdev, skb); 351 352 return NET_XMIT_SUCCESS; 353 } 354 } 355 356 xmit_world: 357 skb->dev = vlan->lowerdev; 358 return dev_queue_xmit(skb); 359 } 360 361 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 362 { 363 #ifdef CONFIG_NET_POLL_CONTROLLER 364 if (vlan->netpoll) 365 netpoll_send_skb(vlan->netpoll, skb); 366 #else 367 BUG(); 368 #endif 369 return NETDEV_TX_OK; 370 } 371 372 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 373 struct net_device *dev) 374 { 375 unsigned int len = skb->len; 376 int ret; 377 struct macvlan_dev *vlan = netdev_priv(dev); 378 379 if (unlikely(netpoll_tx_running(dev))) 380 return macvlan_netpoll_send_skb(vlan, skb); 381 382 if (vlan->fwd_priv) { 383 skb->dev = vlan->lowerdev; 384 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); 385 } else { 386 ret = macvlan_queue_xmit(skb, dev); 387 } 388 389 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 390 struct vlan_pcpu_stats *pcpu_stats; 391 392 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 393 u64_stats_update_begin(&pcpu_stats->syncp); 394 pcpu_stats->tx_packets++; 395 pcpu_stats->tx_bytes += len; 396 u64_stats_update_end(&pcpu_stats->syncp); 397 } else { 398 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 399 } 400 return ret; 401 } 402 403 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 404 unsigned short type, const void *daddr, 405 const void *saddr, unsigned len) 406 { 407 const struct macvlan_dev *vlan = netdev_priv(dev); 408 struct net_device *lowerdev = vlan->lowerdev; 409 410 return dev_hard_header(skb, lowerdev, type, daddr, 411 saddr ? : dev->dev_addr, len); 412 } 413 414 static const struct header_ops macvlan_hard_header_ops = { 415 .create = macvlan_hard_header, 416 .rebuild = eth_rebuild_header, 417 .parse = eth_header_parse, 418 .cache = eth_header_cache, 419 .cache_update = eth_header_cache_update, 420 }; 421 422 static struct rtnl_link_ops macvlan_link_ops; 423 424 static int macvlan_open(struct net_device *dev) 425 { 426 struct macvlan_dev *vlan = netdev_priv(dev); 427 struct net_device *lowerdev = vlan->lowerdev; 428 int err; 429 430 if (vlan->port->passthru) { 431 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 432 err = dev_set_promiscuity(lowerdev, 1); 433 if (err < 0) 434 goto out; 435 } 436 goto hash_add; 437 } 438 439 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && 440 dev->rtnl_link_ops == &macvlan_link_ops) { 441 vlan->fwd_priv = 442 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 443 444 /* If we get a NULL pointer back, or if we get an error 445 * then we should just fall through to the non accelerated path 446 */ 447 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 448 vlan->fwd_priv = NULL; 449 } else 450 return 0; 451 } 452 453 err = -EBUSY; 454 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 455 goto out; 456 457 err = dev_uc_add(lowerdev, dev->dev_addr); 458 if (err < 0) 459 goto out; 460 if (dev->flags & IFF_ALLMULTI) { 461 err = dev_set_allmulti(lowerdev, 1); 462 if (err < 0) 463 goto del_unicast; 464 } 465 466 hash_add: 467 macvlan_hash_add(vlan); 468 return 0; 469 470 del_unicast: 471 dev_uc_del(lowerdev, dev->dev_addr); 472 out: 473 if (vlan->fwd_priv) { 474 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 475 vlan->fwd_priv); 476 vlan->fwd_priv = NULL; 477 } 478 return err; 479 } 480 481 static int macvlan_stop(struct net_device *dev) 482 { 483 struct macvlan_dev *vlan = netdev_priv(dev); 484 struct net_device *lowerdev = vlan->lowerdev; 485 486 if (vlan->fwd_priv) { 487 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 488 vlan->fwd_priv); 489 vlan->fwd_priv = NULL; 490 return 0; 491 } 492 493 dev_uc_unsync(lowerdev, dev); 494 dev_mc_unsync(lowerdev, dev); 495 496 if (vlan->port->passthru) { 497 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 498 dev_set_promiscuity(lowerdev, -1); 499 goto hash_del; 500 } 501 502 if (dev->flags & IFF_ALLMULTI) 503 dev_set_allmulti(lowerdev, -1); 504 505 dev_uc_del(lowerdev, dev->dev_addr); 506 507 hash_del: 508 macvlan_hash_del(vlan, !dev->dismantle); 509 return 0; 510 } 511 512 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 513 { 514 struct macvlan_dev *vlan = netdev_priv(dev); 515 struct net_device *lowerdev = vlan->lowerdev; 516 int err; 517 518 if (!(dev->flags & IFF_UP)) { 519 /* Just copy in the new address */ 520 ether_addr_copy(dev->dev_addr, addr); 521 } else { 522 /* Rehash and update the device filters */ 523 if (macvlan_addr_busy(vlan->port, addr)) 524 return -EBUSY; 525 526 if (!vlan->port->passthru) { 527 err = dev_uc_add(lowerdev, addr); 528 if (err) 529 return err; 530 531 dev_uc_del(lowerdev, dev->dev_addr); 532 } 533 534 macvlan_hash_change_addr(vlan, addr); 535 } 536 return 0; 537 } 538 539 static int macvlan_set_mac_address(struct net_device *dev, void *p) 540 { 541 struct macvlan_dev *vlan = netdev_priv(dev); 542 struct sockaddr *addr = p; 543 544 if (!is_valid_ether_addr(addr->sa_data)) 545 return -EADDRNOTAVAIL; 546 547 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 548 dev_set_mac_address(vlan->lowerdev, addr); 549 return 0; 550 } 551 552 return macvlan_sync_address(dev, addr->sa_data); 553 } 554 555 static void macvlan_change_rx_flags(struct net_device *dev, int change) 556 { 557 struct macvlan_dev *vlan = netdev_priv(dev); 558 struct net_device *lowerdev = vlan->lowerdev; 559 560 if (dev->flags & IFF_UP) { 561 if (change & IFF_ALLMULTI) 562 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 563 } 564 } 565 566 static void macvlan_set_mac_lists(struct net_device *dev) 567 { 568 struct macvlan_dev *vlan = netdev_priv(dev); 569 570 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 571 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); 572 } else { 573 struct netdev_hw_addr *ha; 574 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 575 576 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 577 netdev_for_each_mc_addr(ha, dev) { 578 __set_bit(mc_hash(vlan, ha->addr), filter); 579 } 580 581 __set_bit(mc_hash(vlan, dev->broadcast), filter); 582 583 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); 584 } 585 dev_uc_sync(vlan->lowerdev, dev); 586 dev_mc_sync(vlan->lowerdev, dev); 587 } 588 589 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 590 { 591 struct macvlan_dev *vlan = netdev_priv(dev); 592 593 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 594 return -EINVAL; 595 dev->mtu = new_mtu; 596 return 0; 597 } 598 599 /* 600 * macvlan network devices have devices nesting below it and are a special 601 * "super class" of normal network devices; split their locks off into a 602 * separate class since they always nest. 603 */ 604 static struct lock_class_key macvlan_netdev_xmit_lock_key; 605 static struct lock_class_key macvlan_netdev_addr_lock_key; 606 607 #define ALWAYS_ON_FEATURES \ 608 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX) 609 610 #define MACVLAN_FEATURES \ 611 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 612 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 613 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 614 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 615 616 #define MACVLAN_STATE_MASK \ 617 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 618 619 static int macvlan_get_nest_level(struct net_device *dev) 620 { 621 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 622 } 623 624 static void macvlan_set_lockdep_class_one(struct net_device *dev, 625 struct netdev_queue *txq, 626 void *_unused) 627 { 628 lockdep_set_class(&txq->_xmit_lock, 629 &macvlan_netdev_xmit_lock_key); 630 } 631 632 static void macvlan_set_lockdep_class(struct net_device *dev) 633 { 634 lockdep_set_class_and_subclass(&dev->addr_list_lock, 635 &macvlan_netdev_addr_lock_key, 636 macvlan_get_nest_level(dev)); 637 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 638 } 639 640 static int macvlan_init(struct net_device *dev) 641 { 642 struct macvlan_dev *vlan = netdev_priv(dev); 643 const struct net_device *lowerdev = vlan->lowerdev; 644 645 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 646 (lowerdev->state & MACVLAN_STATE_MASK); 647 dev->features = lowerdev->features & MACVLAN_FEATURES; 648 dev->features |= ALWAYS_ON_FEATURES; 649 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 650 dev->gso_max_size = lowerdev->gso_max_size; 651 dev->iflink = lowerdev->ifindex; 652 dev->hard_header_len = lowerdev->hard_header_len; 653 654 macvlan_set_lockdep_class(dev); 655 656 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 657 if (!vlan->pcpu_stats) 658 return -ENOMEM; 659 660 return 0; 661 } 662 663 static void macvlan_uninit(struct net_device *dev) 664 { 665 struct macvlan_dev *vlan = netdev_priv(dev); 666 struct macvlan_port *port = vlan->port; 667 668 free_percpu(vlan->pcpu_stats); 669 670 if (MACVLAN_PORT_IS_EMPTY(port)) 671 macvlan_port_destroy(port->dev); 672 } 673 674 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 675 struct rtnl_link_stats64 *stats) 676 { 677 struct macvlan_dev *vlan = netdev_priv(dev); 678 679 if (vlan->pcpu_stats) { 680 struct vlan_pcpu_stats *p; 681 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 682 u32 rx_errors = 0, tx_dropped = 0; 683 unsigned int start; 684 int i; 685 686 for_each_possible_cpu(i) { 687 p = per_cpu_ptr(vlan->pcpu_stats, i); 688 do { 689 start = u64_stats_fetch_begin_irq(&p->syncp); 690 rx_packets = p->rx_packets; 691 rx_bytes = p->rx_bytes; 692 rx_multicast = p->rx_multicast; 693 tx_packets = p->tx_packets; 694 tx_bytes = p->tx_bytes; 695 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 696 697 stats->rx_packets += rx_packets; 698 stats->rx_bytes += rx_bytes; 699 stats->multicast += rx_multicast; 700 stats->tx_packets += tx_packets; 701 stats->tx_bytes += tx_bytes; 702 /* rx_errors & tx_dropped are u32, updated 703 * without syncp protection. 704 */ 705 rx_errors += p->rx_errors; 706 tx_dropped += p->tx_dropped; 707 } 708 stats->rx_errors = rx_errors; 709 stats->rx_dropped = rx_errors; 710 stats->tx_dropped = tx_dropped; 711 } 712 return stats; 713 } 714 715 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 716 __be16 proto, u16 vid) 717 { 718 struct macvlan_dev *vlan = netdev_priv(dev); 719 struct net_device *lowerdev = vlan->lowerdev; 720 721 return vlan_vid_add(lowerdev, proto, vid); 722 } 723 724 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 725 __be16 proto, u16 vid) 726 { 727 struct macvlan_dev *vlan = netdev_priv(dev); 728 struct net_device *lowerdev = vlan->lowerdev; 729 730 vlan_vid_del(lowerdev, proto, vid); 731 return 0; 732 } 733 734 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 735 struct net_device *dev, 736 const unsigned char *addr, 737 u16 flags) 738 { 739 struct macvlan_dev *vlan = netdev_priv(dev); 740 int err = -EINVAL; 741 742 if (!vlan->port->passthru) 743 return -EOPNOTSUPP; 744 745 if (flags & NLM_F_REPLACE) 746 return -EOPNOTSUPP; 747 748 if (is_unicast_ether_addr(addr)) 749 err = dev_uc_add_excl(dev, addr); 750 else if (is_multicast_ether_addr(addr)) 751 err = dev_mc_add_excl(dev, addr); 752 753 return err; 754 } 755 756 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 757 struct net_device *dev, 758 const unsigned char *addr) 759 { 760 struct macvlan_dev *vlan = netdev_priv(dev); 761 int err = -EINVAL; 762 763 if (!vlan->port->passthru) 764 return -EOPNOTSUPP; 765 766 if (is_unicast_ether_addr(addr)) 767 err = dev_uc_del(dev, addr); 768 else if (is_multicast_ether_addr(addr)) 769 err = dev_mc_del(dev, addr); 770 771 return err; 772 } 773 774 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 775 struct ethtool_drvinfo *drvinfo) 776 { 777 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 778 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 779 } 780 781 static int macvlan_ethtool_get_settings(struct net_device *dev, 782 struct ethtool_cmd *cmd) 783 { 784 const struct macvlan_dev *vlan = netdev_priv(dev); 785 786 return __ethtool_get_settings(vlan->lowerdev, cmd); 787 } 788 789 static netdev_features_t macvlan_fix_features(struct net_device *dev, 790 netdev_features_t features) 791 { 792 struct macvlan_dev *vlan = netdev_priv(dev); 793 netdev_features_t mask; 794 795 features |= NETIF_F_ALL_FOR_ALL; 796 features &= (vlan->set_features | ~MACVLAN_FEATURES); 797 mask = features; 798 799 features = netdev_increment_features(vlan->lowerdev->features, 800 features, 801 mask); 802 features |= ALWAYS_ON_FEATURES; 803 804 return features; 805 } 806 807 #ifdef CONFIG_NET_POLL_CONTROLLER 808 static void macvlan_dev_poll_controller(struct net_device *dev) 809 { 810 return; 811 } 812 813 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 814 { 815 struct macvlan_dev *vlan = netdev_priv(dev); 816 struct net_device *real_dev = vlan->lowerdev; 817 struct netpoll *netpoll; 818 int err = 0; 819 820 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 821 err = -ENOMEM; 822 if (!netpoll) 823 goto out; 824 825 err = __netpoll_setup(netpoll, real_dev); 826 if (err) { 827 kfree(netpoll); 828 goto out; 829 } 830 831 vlan->netpoll = netpoll; 832 833 out: 834 return err; 835 } 836 837 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 838 { 839 struct macvlan_dev *vlan = netdev_priv(dev); 840 struct netpoll *netpoll = vlan->netpoll; 841 842 if (!netpoll) 843 return; 844 845 vlan->netpoll = NULL; 846 847 __netpoll_free_async(netpoll); 848 } 849 #endif /* CONFIG_NET_POLL_CONTROLLER */ 850 851 static const struct ethtool_ops macvlan_ethtool_ops = { 852 .get_link = ethtool_op_get_link, 853 .get_settings = macvlan_ethtool_get_settings, 854 .get_drvinfo = macvlan_ethtool_get_drvinfo, 855 }; 856 857 static const struct net_device_ops macvlan_netdev_ops = { 858 .ndo_init = macvlan_init, 859 .ndo_uninit = macvlan_uninit, 860 .ndo_open = macvlan_open, 861 .ndo_stop = macvlan_stop, 862 .ndo_start_xmit = macvlan_start_xmit, 863 .ndo_change_mtu = macvlan_change_mtu, 864 .ndo_fix_features = macvlan_fix_features, 865 .ndo_change_rx_flags = macvlan_change_rx_flags, 866 .ndo_set_mac_address = macvlan_set_mac_address, 867 .ndo_set_rx_mode = macvlan_set_mac_lists, 868 .ndo_get_stats64 = macvlan_dev_get_stats64, 869 .ndo_validate_addr = eth_validate_addr, 870 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 871 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 872 .ndo_fdb_add = macvlan_fdb_add, 873 .ndo_fdb_del = macvlan_fdb_del, 874 .ndo_fdb_dump = ndo_dflt_fdb_dump, 875 .ndo_get_lock_subclass = macvlan_get_nest_level, 876 #ifdef CONFIG_NET_POLL_CONTROLLER 877 .ndo_poll_controller = macvlan_dev_poll_controller, 878 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 879 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 880 #endif 881 }; 882 883 void macvlan_common_setup(struct net_device *dev) 884 { 885 ether_setup(dev); 886 887 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 888 dev->priv_flags |= IFF_UNICAST_FLT; 889 dev->netdev_ops = &macvlan_netdev_ops; 890 dev->destructor = free_netdev; 891 dev->header_ops = &macvlan_hard_header_ops; 892 dev->ethtool_ops = &macvlan_ethtool_ops; 893 } 894 EXPORT_SYMBOL_GPL(macvlan_common_setup); 895 896 static void macvlan_setup(struct net_device *dev) 897 { 898 macvlan_common_setup(dev); 899 dev->tx_queue_len = 0; 900 } 901 902 static int macvlan_port_create(struct net_device *dev) 903 { 904 struct macvlan_port *port; 905 unsigned int i; 906 int err; 907 908 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 909 return -EINVAL; 910 911 port = kzalloc(sizeof(*port), GFP_KERNEL); 912 if (port == NULL) 913 return -ENOMEM; 914 915 port->passthru = false; 916 port->dev = dev; 917 INIT_LIST_HEAD(&port->vlans); 918 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 919 INIT_HLIST_HEAD(&port->vlan_hash[i]); 920 921 skb_queue_head_init(&port->bc_queue); 922 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 923 924 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 925 if (err) 926 kfree(port); 927 else 928 dev->priv_flags |= IFF_MACVLAN_PORT; 929 return err; 930 } 931 932 static void macvlan_port_destroy(struct net_device *dev) 933 { 934 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 935 936 cancel_work_sync(&port->bc_work); 937 dev->priv_flags &= ~IFF_MACVLAN_PORT; 938 netdev_rx_handler_unregister(dev); 939 kfree_rcu(port, rcu); 940 } 941 942 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 943 { 944 if (tb[IFLA_ADDRESS]) { 945 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 946 return -EINVAL; 947 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 948 return -EADDRNOTAVAIL; 949 } 950 951 if (data && data[IFLA_MACVLAN_FLAGS] && 952 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 953 return -EINVAL; 954 955 if (data && data[IFLA_MACVLAN_MODE]) { 956 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 957 case MACVLAN_MODE_PRIVATE: 958 case MACVLAN_MODE_VEPA: 959 case MACVLAN_MODE_BRIDGE: 960 case MACVLAN_MODE_PASSTHRU: 961 break; 962 default: 963 return -EINVAL; 964 } 965 } 966 return 0; 967 } 968 969 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 970 struct nlattr *tb[], struct nlattr *data[]) 971 { 972 struct macvlan_dev *vlan = netdev_priv(dev); 973 struct macvlan_port *port; 974 struct net_device *lowerdev; 975 int err; 976 977 if (!tb[IFLA_LINK]) 978 return -EINVAL; 979 980 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 981 if (lowerdev == NULL) 982 return -ENODEV; 983 984 /* When creating macvlans or macvtaps on top of other macvlans - use 985 * the real device as the lowerdev. 986 */ 987 if (netif_is_macvlan(lowerdev)) 988 lowerdev = macvlan_dev_real_dev(lowerdev); 989 990 if (!tb[IFLA_MTU]) 991 dev->mtu = lowerdev->mtu; 992 else if (dev->mtu > lowerdev->mtu) 993 return -EINVAL; 994 995 if (!tb[IFLA_ADDRESS]) 996 eth_hw_addr_random(dev); 997 998 if (!macvlan_port_exists(lowerdev)) { 999 err = macvlan_port_create(lowerdev); 1000 if (err < 0) 1001 return err; 1002 } 1003 port = macvlan_port_get_rtnl(lowerdev); 1004 1005 /* Only 1 macvlan device can be created in passthru mode */ 1006 if (port->passthru) 1007 return -EINVAL; 1008 1009 vlan->lowerdev = lowerdev; 1010 vlan->dev = dev; 1011 vlan->port = port; 1012 vlan->set_features = MACVLAN_FEATURES; 1013 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1; 1014 1015 vlan->mode = MACVLAN_MODE_VEPA; 1016 if (data && data[IFLA_MACVLAN_MODE]) 1017 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1018 1019 if (data && data[IFLA_MACVLAN_FLAGS]) 1020 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1021 1022 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1023 if (!MACVLAN_PORT_IS_EMPTY(port)) 1024 return -EINVAL; 1025 port->passthru = true; 1026 eth_hw_addr_inherit(dev, lowerdev); 1027 } 1028 1029 err = register_netdevice(dev); 1030 if (err < 0) 1031 goto destroy_port; 1032 1033 dev->priv_flags |= IFF_MACVLAN; 1034 err = netdev_upper_dev_link(lowerdev, dev); 1035 if (err) 1036 goto unregister_netdev; 1037 1038 list_add_tail_rcu(&vlan->list, &port->vlans); 1039 netif_stacked_transfer_operstate(lowerdev, dev); 1040 1041 return 0; 1042 1043 unregister_netdev: 1044 unregister_netdevice(dev); 1045 destroy_port: 1046 if (MACVLAN_PORT_IS_EMPTY(port)) 1047 macvlan_port_destroy(lowerdev); 1048 1049 return err; 1050 } 1051 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1052 1053 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1054 struct nlattr *tb[], struct nlattr *data[]) 1055 { 1056 return macvlan_common_newlink(src_net, dev, tb, data); 1057 } 1058 1059 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1060 { 1061 struct macvlan_dev *vlan = netdev_priv(dev); 1062 1063 list_del_rcu(&vlan->list); 1064 unregister_netdevice_queue(dev, head); 1065 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1066 } 1067 EXPORT_SYMBOL_GPL(macvlan_dellink); 1068 1069 static int macvlan_changelink(struct net_device *dev, 1070 struct nlattr *tb[], struct nlattr *data[]) 1071 { 1072 struct macvlan_dev *vlan = netdev_priv(dev); 1073 enum macvlan_mode mode; 1074 bool set_mode = false; 1075 1076 /* Validate mode, but don't set yet: setting flags may fail. */ 1077 if (data && data[IFLA_MACVLAN_MODE]) { 1078 set_mode = true; 1079 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1080 /* Passthrough mode can't be set or cleared dynamically */ 1081 if ((mode == MACVLAN_MODE_PASSTHRU) != 1082 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1083 return -EINVAL; 1084 } 1085 1086 if (data && data[IFLA_MACVLAN_FLAGS]) { 1087 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1088 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1089 if (vlan->port->passthru && promisc) { 1090 int err; 1091 1092 if (flags & MACVLAN_FLAG_NOPROMISC) 1093 err = dev_set_promiscuity(vlan->lowerdev, -1); 1094 else 1095 err = dev_set_promiscuity(vlan->lowerdev, 1); 1096 if (err < 0) 1097 return err; 1098 } 1099 vlan->flags = flags; 1100 } 1101 if (set_mode) 1102 vlan->mode = mode; 1103 return 0; 1104 } 1105 1106 static size_t macvlan_get_size(const struct net_device *dev) 1107 { 1108 return (0 1109 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1110 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1111 ); 1112 } 1113 1114 static int macvlan_fill_info(struct sk_buff *skb, 1115 const struct net_device *dev) 1116 { 1117 struct macvlan_dev *vlan = netdev_priv(dev); 1118 1119 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1120 goto nla_put_failure; 1121 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1122 goto nla_put_failure; 1123 return 0; 1124 1125 nla_put_failure: 1126 return -EMSGSIZE; 1127 } 1128 1129 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1130 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1131 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1132 }; 1133 1134 int macvlan_link_register(struct rtnl_link_ops *ops) 1135 { 1136 /* common fields */ 1137 ops->priv_size = sizeof(struct macvlan_dev); 1138 ops->validate = macvlan_validate; 1139 ops->maxtype = IFLA_MACVLAN_MAX; 1140 ops->policy = macvlan_policy; 1141 ops->changelink = macvlan_changelink; 1142 ops->get_size = macvlan_get_size; 1143 ops->fill_info = macvlan_fill_info; 1144 1145 return rtnl_link_register(ops); 1146 }; 1147 EXPORT_SYMBOL_GPL(macvlan_link_register); 1148 1149 static struct rtnl_link_ops macvlan_link_ops = { 1150 .kind = "macvlan", 1151 .setup = macvlan_setup, 1152 .newlink = macvlan_newlink, 1153 .dellink = macvlan_dellink, 1154 }; 1155 1156 static int macvlan_device_event(struct notifier_block *unused, 1157 unsigned long event, void *ptr) 1158 { 1159 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1160 struct macvlan_dev *vlan, *next; 1161 struct macvlan_port *port; 1162 LIST_HEAD(list_kill); 1163 1164 if (!macvlan_port_exists(dev)) 1165 return NOTIFY_DONE; 1166 1167 port = macvlan_port_get_rtnl(dev); 1168 1169 switch (event) { 1170 case NETDEV_CHANGE: 1171 list_for_each_entry(vlan, &port->vlans, list) 1172 netif_stacked_transfer_operstate(vlan->lowerdev, 1173 vlan->dev); 1174 break; 1175 case NETDEV_FEAT_CHANGE: 1176 list_for_each_entry(vlan, &port->vlans, list) { 1177 vlan->dev->gso_max_size = dev->gso_max_size; 1178 netdev_update_features(vlan->dev); 1179 } 1180 break; 1181 case NETDEV_CHANGEMTU: 1182 list_for_each_entry(vlan, &port->vlans, list) { 1183 if (vlan->dev->mtu <= dev->mtu) 1184 continue; 1185 dev_set_mtu(vlan->dev, dev->mtu); 1186 } 1187 break; 1188 case NETDEV_CHANGEADDR: 1189 if (!port->passthru) 1190 return NOTIFY_DONE; 1191 1192 vlan = list_first_entry_or_null(&port->vlans, 1193 struct macvlan_dev, 1194 list); 1195 1196 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1197 return NOTIFY_BAD; 1198 1199 break; 1200 case NETDEV_UNREGISTER: 1201 /* twiddle thumbs on netns device moves */ 1202 if (dev->reg_state != NETREG_UNREGISTERING) 1203 break; 1204 1205 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1206 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1207 unregister_netdevice_many(&list_kill); 1208 break; 1209 case NETDEV_PRE_TYPE_CHANGE: 1210 /* Forbid underlaying device to change its type. */ 1211 return NOTIFY_BAD; 1212 1213 case NETDEV_NOTIFY_PEERS: 1214 case NETDEV_BONDING_FAILOVER: 1215 case NETDEV_RESEND_IGMP: 1216 /* Propagate to all vlans */ 1217 list_for_each_entry(vlan, &port->vlans, list) 1218 call_netdevice_notifiers(event, vlan->dev); 1219 } 1220 return NOTIFY_DONE; 1221 } 1222 1223 static struct notifier_block macvlan_notifier_block __read_mostly = { 1224 .notifier_call = macvlan_device_event, 1225 }; 1226 1227 static int __init macvlan_init_module(void) 1228 { 1229 int err; 1230 1231 register_netdevice_notifier(&macvlan_notifier_block); 1232 1233 err = macvlan_link_register(&macvlan_link_ops); 1234 if (err < 0) 1235 goto err1; 1236 return 0; 1237 err1: 1238 unregister_netdevice_notifier(&macvlan_notifier_block); 1239 return err; 1240 } 1241 1242 static void __exit macvlan_cleanup_module(void) 1243 { 1244 rtnl_link_unregister(&macvlan_link_ops); 1245 unregister_netdevice_notifier(&macvlan_notifier_block); 1246 } 1247 1248 module_init(macvlan_init_module); 1249 module_exit(macvlan_cleanup_module); 1250 1251 MODULE_LICENSE("GPL"); 1252 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1253 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1254 MODULE_ALIAS_RTNL_LINK("macvlan"); 1255