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 int count; 49 }; 50 51 struct macvlan_skb_cb { 52 const struct macvlan_dev *src; 53 }; 54 55 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 56 57 static void macvlan_port_destroy(struct net_device *dev); 58 59 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 60 { 61 return rcu_dereference(dev->rx_handler_data); 62 } 63 64 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 65 { 66 return rtnl_dereference(dev->rx_handler_data); 67 } 68 69 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 70 71 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 72 const unsigned char *addr) 73 { 74 struct macvlan_dev *vlan; 75 76 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) { 77 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 78 return vlan; 79 } 80 return NULL; 81 } 82 83 static void macvlan_hash_add(struct macvlan_dev *vlan) 84 { 85 struct macvlan_port *port = vlan->port; 86 const unsigned char *addr = vlan->dev->dev_addr; 87 88 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); 89 } 90 91 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 92 { 93 hlist_del_rcu(&vlan->hlist); 94 if (sync) 95 synchronize_rcu(); 96 } 97 98 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 99 const unsigned char *addr) 100 { 101 macvlan_hash_del(vlan, true); 102 /* Now that we are unhashed it is safe to change the device 103 * address without confusing packet delivery. 104 */ 105 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 106 macvlan_hash_add(vlan); 107 } 108 109 static int macvlan_addr_busy(const struct macvlan_port *port, 110 const unsigned char *addr) 111 { 112 /* Test to see if the specified multicast address is 113 * currently in use by the underlying device or 114 * another macvlan. 115 */ 116 if (ether_addr_equal_64bits(port->dev->dev_addr, addr)) 117 return 1; 118 119 if (macvlan_hash_lookup(port, addr)) 120 return 1; 121 122 return 0; 123 } 124 125 126 static int macvlan_broadcast_one(struct sk_buff *skb, 127 const struct macvlan_dev *vlan, 128 const struct ethhdr *eth, bool local) 129 { 130 struct net_device *dev = vlan->dev; 131 132 if (local) 133 return __dev_forward_skb(dev, skb); 134 135 skb->dev = dev; 136 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 137 skb->pkt_type = PACKET_BROADCAST; 138 else 139 skb->pkt_type = PACKET_MULTICAST; 140 141 return 0; 142 } 143 144 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 145 { 146 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 147 } 148 149 150 static unsigned int mc_hash(const struct macvlan_dev *vlan, 151 const unsigned char *addr) 152 { 153 u32 val = __get_unaligned_cpu32(addr + 2); 154 155 val ^= macvlan_hash_mix(vlan); 156 return hash_32(val, MACVLAN_MC_FILTER_BITS); 157 } 158 159 static void macvlan_broadcast(struct sk_buff *skb, 160 const struct macvlan_port *port, 161 struct net_device *src, 162 enum macvlan_mode mode) 163 { 164 const struct ethhdr *eth = eth_hdr(skb); 165 const struct macvlan_dev *vlan; 166 struct sk_buff *nskb; 167 unsigned int i; 168 int err; 169 unsigned int hash; 170 171 if (skb->protocol == htons(ETH_P_PAUSE)) 172 return; 173 174 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 175 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 176 if (vlan->dev == src || !(vlan->mode & mode)) 177 continue; 178 179 hash = mc_hash(vlan, eth->h_dest); 180 if (!test_bit(hash, vlan->mc_filter)) 181 continue; 182 183 err = NET_RX_DROP; 184 nskb = skb_clone(skb, GFP_ATOMIC); 185 if (likely(nskb)) 186 err = macvlan_broadcast_one( 187 nskb, vlan, eth, 188 mode == MACVLAN_MODE_BRIDGE) ?: 189 netif_rx_ni(nskb); 190 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 191 err == NET_RX_SUCCESS, 1); 192 } 193 } 194 } 195 196 static void macvlan_process_broadcast(struct work_struct *w) 197 { 198 struct macvlan_port *port = container_of(w, struct macvlan_port, 199 bc_work); 200 struct sk_buff *skb; 201 struct sk_buff_head list; 202 203 skb_queue_head_init(&list); 204 205 spin_lock_bh(&port->bc_queue.lock); 206 skb_queue_splice_tail_init(&port->bc_queue, &list); 207 spin_unlock_bh(&port->bc_queue.lock); 208 209 while ((skb = __skb_dequeue(&list))) { 210 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 211 212 rcu_read_lock(); 213 214 if (!src) 215 /* frame comes from an external address */ 216 macvlan_broadcast(skb, port, NULL, 217 MACVLAN_MODE_PRIVATE | 218 MACVLAN_MODE_VEPA | 219 MACVLAN_MODE_PASSTHRU| 220 MACVLAN_MODE_BRIDGE); 221 else if (src->mode == MACVLAN_MODE_VEPA) 222 /* flood to everyone except source */ 223 macvlan_broadcast(skb, port, src->dev, 224 MACVLAN_MODE_VEPA | 225 MACVLAN_MODE_BRIDGE); 226 else 227 /* 228 * flood only to VEPA ports, bridge ports 229 * already saw the frame on the way out. 230 */ 231 macvlan_broadcast(skb, port, src->dev, 232 MACVLAN_MODE_VEPA); 233 234 rcu_read_unlock(); 235 236 kfree_skb(skb); 237 } 238 } 239 240 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 241 struct sk_buff *skb) 242 { 243 struct sk_buff *nskb; 244 int err = -ENOMEM; 245 246 nskb = skb_clone(skb, GFP_ATOMIC); 247 if (!nskb) 248 goto err; 249 250 spin_lock(&port->bc_queue.lock); 251 if (skb_queue_len(&port->bc_queue) < skb->dev->tx_queue_len) { 252 __skb_queue_tail(&port->bc_queue, nskb); 253 err = 0; 254 } 255 spin_unlock(&port->bc_queue.lock); 256 257 if (err) 258 goto free_nskb; 259 260 schedule_work(&port->bc_work); 261 return; 262 263 free_nskb: 264 kfree_skb(nskb); 265 err: 266 atomic_long_inc(&skb->dev->rx_dropped); 267 } 268 269 /* called under rcu_read_lock() from netif_receive_skb */ 270 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 271 { 272 struct macvlan_port *port; 273 struct sk_buff *skb = *pskb; 274 const struct ethhdr *eth = eth_hdr(skb); 275 const struct macvlan_dev *vlan; 276 const struct macvlan_dev *src; 277 struct net_device *dev; 278 unsigned int len = 0; 279 int ret = NET_RX_DROP; 280 281 port = macvlan_port_get_rcu(skb->dev); 282 if (is_multicast_ether_addr(eth->h_dest)) { 283 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN); 284 if (!skb) 285 return RX_HANDLER_CONSUMED; 286 eth = eth_hdr(skb); 287 src = macvlan_hash_lookup(port, eth->h_source); 288 if (src && src->mode != MACVLAN_MODE_VEPA && 289 src->mode != MACVLAN_MODE_BRIDGE) { 290 /* forward to original port. */ 291 vlan = src; 292 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 293 netif_rx(skb); 294 goto out; 295 } 296 297 MACVLAN_SKB_CB(skb)->src = src; 298 macvlan_broadcast_enqueue(port, skb); 299 300 return RX_HANDLER_PASS; 301 } 302 303 if (port->passthru) 304 vlan = list_first_or_null_rcu(&port->vlans, 305 struct macvlan_dev, list); 306 else 307 vlan = macvlan_hash_lookup(port, eth->h_dest); 308 if (vlan == NULL) 309 return RX_HANDLER_PASS; 310 311 dev = vlan->dev; 312 if (unlikely(!(dev->flags & IFF_UP))) { 313 kfree_skb(skb); 314 return RX_HANDLER_CONSUMED; 315 } 316 len = skb->len + ETH_HLEN; 317 skb = skb_share_check(skb, GFP_ATOMIC); 318 if (!skb) 319 goto out; 320 321 skb->dev = dev; 322 skb->pkt_type = PACKET_HOST; 323 324 ret = netif_rx(skb); 325 326 out: 327 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); 328 return RX_HANDLER_CONSUMED; 329 } 330 331 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 332 { 333 const struct macvlan_dev *vlan = netdev_priv(dev); 334 const struct macvlan_port *port = vlan->port; 335 const struct macvlan_dev *dest; 336 337 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 338 const struct ethhdr *eth = (void *)skb->data; 339 340 /* send to other bridge ports directly */ 341 if (is_multicast_ether_addr(eth->h_dest)) { 342 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 343 goto xmit_world; 344 } 345 346 dest = macvlan_hash_lookup(port, eth->h_dest); 347 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 348 /* send to lowerdev first for its network taps */ 349 dev_forward_skb(vlan->lowerdev, skb); 350 351 return NET_XMIT_SUCCESS; 352 } 353 } 354 355 xmit_world: 356 skb->dev = vlan->lowerdev; 357 return dev_queue_xmit(skb); 358 } 359 360 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 361 { 362 #ifdef CONFIG_NET_POLL_CONTROLLER 363 if (vlan->netpoll) 364 netpoll_send_skb(vlan->netpoll, skb); 365 #else 366 BUG(); 367 #endif 368 return NETDEV_TX_OK; 369 } 370 371 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 372 struct net_device *dev) 373 { 374 unsigned int len = skb->len; 375 int ret; 376 struct macvlan_dev *vlan = netdev_priv(dev); 377 378 if (unlikely(netpoll_tx_running(dev))) 379 return macvlan_netpoll_send_skb(vlan, skb); 380 381 if (vlan->fwd_priv) { 382 skb->dev = vlan->lowerdev; 383 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); 384 } else { 385 ret = macvlan_queue_xmit(skb, dev); 386 } 387 388 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 389 struct vlan_pcpu_stats *pcpu_stats; 390 391 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 392 u64_stats_update_begin(&pcpu_stats->syncp); 393 pcpu_stats->tx_packets++; 394 pcpu_stats->tx_bytes += len; 395 u64_stats_update_end(&pcpu_stats->syncp); 396 } else { 397 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 398 } 399 return ret; 400 } 401 402 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 403 unsigned short type, const void *daddr, 404 const void *saddr, unsigned len) 405 { 406 const struct macvlan_dev *vlan = netdev_priv(dev); 407 struct net_device *lowerdev = vlan->lowerdev; 408 409 return dev_hard_header(skb, lowerdev, type, daddr, 410 saddr ? : dev->dev_addr, len); 411 } 412 413 static const struct header_ops macvlan_hard_header_ops = { 414 .create = macvlan_hard_header, 415 .rebuild = eth_rebuild_header, 416 .parse = eth_header_parse, 417 .cache = eth_header_cache, 418 .cache_update = eth_header_cache_update, 419 }; 420 421 static struct rtnl_link_ops macvlan_link_ops; 422 423 static int macvlan_open(struct net_device *dev) 424 { 425 struct macvlan_dev *vlan = netdev_priv(dev); 426 struct net_device *lowerdev = vlan->lowerdev; 427 int err; 428 429 if (vlan->port->passthru) { 430 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 431 err = dev_set_promiscuity(lowerdev, 1); 432 if (err < 0) 433 goto out; 434 } 435 goto hash_add; 436 } 437 438 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && 439 dev->rtnl_link_ops == &macvlan_link_ops) { 440 vlan->fwd_priv = 441 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 442 443 /* If we get a NULL pointer back, or if we get an error 444 * then we should just fall through to the non accelerated path 445 */ 446 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 447 vlan->fwd_priv = NULL; 448 } else 449 return 0; 450 } 451 452 err = -EBUSY; 453 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 454 goto out; 455 456 err = dev_uc_add(lowerdev, dev->dev_addr); 457 if (err < 0) 458 goto out; 459 if (dev->flags & IFF_ALLMULTI) { 460 err = dev_set_allmulti(lowerdev, 1); 461 if (err < 0) 462 goto del_unicast; 463 } 464 465 hash_add: 466 macvlan_hash_add(vlan); 467 return 0; 468 469 del_unicast: 470 dev_uc_del(lowerdev, dev->dev_addr); 471 out: 472 if (vlan->fwd_priv) { 473 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 474 vlan->fwd_priv); 475 vlan->fwd_priv = NULL; 476 } 477 return err; 478 } 479 480 static int macvlan_stop(struct net_device *dev) 481 { 482 struct macvlan_dev *vlan = netdev_priv(dev); 483 struct net_device *lowerdev = vlan->lowerdev; 484 485 if (vlan->fwd_priv) { 486 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 487 vlan->fwd_priv); 488 vlan->fwd_priv = NULL; 489 return 0; 490 } 491 492 dev_uc_unsync(lowerdev, dev); 493 dev_mc_unsync(lowerdev, dev); 494 495 if (vlan->port->passthru) { 496 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 497 dev_set_promiscuity(lowerdev, -1); 498 goto hash_del; 499 } 500 501 if (dev->flags & IFF_ALLMULTI) 502 dev_set_allmulti(lowerdev, -1); 503 504 dev_uc_del(lowerdev, dev->dev_addr); 505 506 hash_del: 507 macvlan_hash_del(vlan, !dev->dismantle); 508 return 0; 509 } 510 511 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 512 { 513 struct macvlan_dev *vlan = netdev_priv(dev); 514 struct net_device *lowerdev = vlan->lowerdev; 515 int err; 516 517 if (!(dev->flags & IFF_UP)) { 518 /* Just copy in the new address */ 519 ether_addr_copy(dev->dev_addr, addr); 520 } else { 521 /* Rehash and update the device filters */ 522 if (macvlan_addr_busy(vlan->port, addr)) 523 return -EBUSY; 524 525 if (!vlan->port->passthru) { 526 err = dev_uc_add(lowerdev, addr); 527 if (err) 528 return err; 529 530 dev_uc_del(lowerdev, dev->dev_addr); 531 } 532 533 macvlan_hash_change_addr(vlan, addr); 534 } 535 return 0; 536 } 537 538 static int macvlan_set_mac_address(struct net_device *dev, void *p) 539 { 540 struct macvlan_dev *vlan = netdev_priv(dev); 541 struct sockaddr *addr = p; 542 543 if (!is_valid_ether_addr(addr->sa_data)) 544 return -EADDRNOTAVAIL; 545 546 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 547 dev_set_mac_address(vlan->lowerdev, addr); 548 return 0; 549 } 550 551 return macvlan_sync_address(dev, addr->sa_data); 552 } 553 554 static void macvlan_change_rx_flags(struct net_device *dev, int change) 555 { 556 struct macvlan_dev *vlan = netdev_priv(dev); 557 struct net_device *lowerdev = vlan->lowerdev; 558 559 if (dev->flags & IFF_UP) { 560 if (change & IFF_ALLMULTI) 561 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 562 } 563 } 564 565 static void macvlan_set_mac_lists(struct net_device *dev) 566 { 567 struct macvlan_dev *vlan = netdev_priv(dev); 568 569 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 570 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); 571 } else { 572 struct netdev_hw_addr *ha; 573 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 574 575 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 576 netdev_for_each_mc_addr(ha, dev) { 577 __set_bit(mc_hash(vlan, ha->addr), filter); 578 } 579 580 __set_bit(mc_hash(vlan, dev->broadcast), filter); 581 582 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); 583 } 584 dev_uc_sync(vlan->lowerdev, dev); 585 dev_mc_sync(vlan->lowerdev, dev); 586 } 587 588 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 589 { 590 struct macvlan_dev *vlan = netdev_priv(dev); 591 592 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 593 return -EINVAL; 594 dev->mtu = new_mtu; 595 return 0; 596 } 597 598 /* 599 * macvlan network devices have devices nesting below it and are a special 600 * "super class" of normal network devices; split their locks off into a 601 * separate class since they always nest. 602 */ 603 static struct lock_class_key macvlan_netdev_xmit_lock_key; 604 static struct lock_class_key macvlan_netdev_addr_lock_key; 605 606 #define ALWAYS_ON_FEATURES \ 607 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX) 608 609 #define MACVLAN_FEATURES \ 610 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 611 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 612 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 613 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 614 615 #define MACVLAN_STATE_MASK \ 616 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 617 618 static int macvlan_get_nest_level(struct net_device *dev) 619 { 620 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 621 } 622 623 static void macvlan_set_lockdep_class_one(struct net_device *dev, 624 struct netdev_queue *txq, 625 void *_unused) 626 { 627 lockdep_set_class(&txq->_xmit_lock, 628 &macvlan_netdev_xmit_lock_key); 629 } 630 631 static void macvlan_set_lockdep_class(struct net_device *dev) 632 { 633 lockdep_set_class_and_subclass(&dev->addr_list_lock, 634 &macvlan_netdev_addr_lock_key, 635 macvlan_get_nest_level(dev)); 636 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 637 } 638 639 static int macvlan_init(struct net_device *dev) 640 { 641 struct macvlan_dev *vlan = netdev_priv(dev); 642 const struct net_device *lowerdev = vlan->lowerdev; 643 644 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 645 (lowerdev->state & MACVLAN_STATE_MASK); 646 dev->features = lowerdev->features & MACVLAN_FEATURES; 647 dev->features |= ALWAYS_ON_FEATURES; 648 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 649 dev->gso_max_size = lowerdev->gso_max_size; 650 dev->iflink = lowerdev->ifindex; 651 dev->hard_header_len = lowerdev->hard_header_len; 652 653 macvlan_set_lockdep_class(dev); 654 655 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 656 if (!vlan->pcpu_stats) 657 return -ENOMEM; 658 659 return 0; 660 } 661 662 static void macvlan_uninit(struct net_device *dev) 663 { 664 struct macvlan_dev *vlan = netdev_priv(dev); 665 struct macvlan_port *port = vlan->port; 666 667 free_percpu(vlan->pcpu_stats); 668 669 port->count -= 1; 670 if (!port->count) 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 /* Support unicast filter only on passthru devices. 743 * Multicast filter should be allowed on all devices. 744 */ 745 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 746 return -EOPNOTSUPP; 747 748 if (flags & NLM_F_REPLACE) 749 return -EOPNOTSUPP; 750 751 if (is_unicast_ether_addr(addr)) 752 err = dev_uc_add_excl(dev, addr); 753 else if (is_multicast_ether_addr(addr)) 754 err = dev_mc_add_excl(dev, addr); 755 756 return err; 757 } 758 759 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 760 struct net_device *dev, 761 const unsigned char *addr) 762 { 763 struct macvlan_dev *vlan = netdev_priv(dev); 764 int err = -EINVAL; 765 766 /* Support unicast filter only on passthru devices. 767 * Multicast filter should be allowed on all devices. 768 */ 769 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 770 return -EOPNOTSUPP; 771 772 if (is_unicast_ether_addr(addr)) 773 err = dev_uc_del(dev, addr); 774 else if (is_multicast_ether_addr(addr)) 775 err = dev_mc_del(dev, addr); 776 777 return err; 778 } 779 780 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 781 struct ethtool_drvinfo *drvinfo) 782 { 783 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 784 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 785 } 786 787 static int macvlan_ethtool_get_settings(struct net_device *dev, 788 struct ethtool_cmd *cmd) 789 { 790 const struct macvlan_dev *vlan = netdev_priv(dev); 791 792 return __ethtool_get_settings(vlan->lowerdev, cmd); 793 } 794 795 static netdev_features_t macvlan_fix_features(struct net_device *dev, 796 netdev_features_t features) 797 { 798 struct macvlan_dev *vlan = netdev_priv(dev); 799 netdev_features_t mask; 800 801 features |= NETIF_F_ALL_FOR_ALL; 802 features &= (vlan->set_features | ~MACVLAN_FEATURES); 803 mask = features; 804 805 features = netdev_increment_features(vlan->lowerdev->features, 806 features, 807 mask); 808 features |= ALWAYS_ON_FEATURES; 809 810 return features; 811 } 812 813 #ifdef CONFIG_NET_POLL_CONTROLLER 814 static void macvlan_dev_poll_controller(struct net_device *dev) 815 { 816 return; 817 } 818 819 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 820 { 821 struct macvlan_dev *vlan = netdev_priv(dev); 822 struct net_device *real_dev = vlan->lowerdev; 823 struct netpoll *netpoll; 824 int err = 0; 825 826 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 827 err = -ENOMEM; 828 if (!netpoll) 829 goto out; 830 831 err = __netpoll_setup(netpoll, real_dev); 832 if (err) { 833 kfree(netpoll); 834 goto out; 835 } 836 837 vlan->netpoll = netpoll; 838 839 out: 840 return err; 841 } 842 843 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 844 { 845 struct macvlan_dev *vlan = netdev_priv(dev); 846 struct netpoll *netpoll = vlan->netpoll; 847 848 if (!netpoll) 849 return; 850 851 vlan->netpoll = NULL; 852 853 __netpoll_free_async(netpoll); 854 } 855 #endif /* CONFIG_NET_POLL_CONTROLLER */ 856 857 static const struct ethtool_ops macvlan_ethtool_ops = { 858 .get_link = ethtool_op_get_link, 859 .get_settings = macvlan_ethtool_get_settings, 860 .get_drvinfo = macvlan_ethtool_get_drvinfo, 861 }; 862 863 static const struct net_device_ops macvlan_netdev_ops = { 864 .ndo_init = macvlan_init, 865 .ndo_uninit = macvlan_uninit, 866 .ndo_open = macvlan_open, 867 .ndo_stop = macvlan_stop, 868 .ndo_start_xmit = macvlan_start_xmit, 869 .ndo_change_mtu = macvlan_change_mtu, 870 .ndo_fix_features = macvlan_fix_features, 871 .ndo_change_rx_flags = macvlan_change_rx_flags, 872 .ndo_set_mac_address = macvlan_set_mac_address, 873 .ndo_set_rx_mode = macvlan_set_mac_lists, 874 .ndo_get_stats64 = macvlan_dev_get_stats64, 875 .ndo_validate_addr = eth_validate_addr, 876 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 877 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 878 .ndo_fdb_add = macvlan_fdb_add, 879 .ndo_fdb_del = macvlan_fdb_del, 880 .ndo_fdb_dump = ndo_dflt_fdb_dump, 881 .ndo_get_lock_subclass = macvlan_get_nest_level, 882 #ifdef CONFIG_NET_POLL_CONTROLLER 883 .ndo_poll_controller = macvlan_dev_poll_controller, 884 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 885 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 886 #endif 887 }; 888 889 void macvlan_common_setup(struct net_device *dev) 890 { 891 ether_setup(dev); 892 893 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 894 dev->priv_flags |= IFF_UNICAST_FLT; 895 dev->netdev_ops = &macvlan_netdev_ops; 896 dev->destructor = free_netdev; 897 dev->header_ops = &macvlan_hard_header_ops; 898 dev->ethtool_ops = &macvlan_ethtool_ops; 899 } 900 EXPORT_SYMBOL_GPL(macvlan_common_setup); 901 902 static void macvlan_setup(struct net_device *dev) 903 { 904 macvlan_common_setup(dev); 905 dev->tx_queue_len = 0; 906 } 907 908 static int macvlan_port_create(struct net_device *dev) 909 { 910 struct macvlan_port *port; 911 unsigned int i; 912 int err; 913 914 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 915 return -EINVAL; 916 917 port = kzalloc(sizeof(*port), GFP_KERNEL); 918 if (port == NULL) 919 return -ENOMEM; 920 921 port->passthru = false; 922 port->dev = dev; 923 INIT_LIST_HEAD(&port->vlans); 924 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 925 INIT_HLIST_HEAD(&port->vlan_hash[i]); 926 927 skb_queue_head_init(&port->bc_queue); 928 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 929 930 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 931 if (err) 932 kfree(port); 933 else 934 dev->priv_flags |= IFF_MACVLAN_PORT; 935 return err; 936 } 937 938 static void macvlan_port_destroy(struct net_device *dev) 939 { 940 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 941 942 cancel_work_sync(&port->bc_work); 943 dev->priv_flags &= ~IFF_MACVLAN_PORT; 944 netdev_rx_handler_unregister(dev); 945 kfree_rcu(port, rcu); 946 } 947 948 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 949 { 950 if (tb[IFLA_ADDRESS]) { 951 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 952 return -EINVAL; 953 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 954 return -EADDRNOTAVAIL; 955 } 956 957 if (data && data[IFLA_MACVLAN_FLAGS] && 958 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 959 return -EINVAL; 960 961 if (data && data[IFLA_MACVLAN_MODE]) { 962 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 963 case MACVLAN_MODE_PRIVATE: 964 case MACVLAN_MODE_VEPA: 965 case MACVLAN_MODE_BRIDGE: 966 case MACVLAN_MODE_PASSTHRU: 967 break; 968 default: 969 return -EINVAL; 970 } 971 } 972 return 0; 973 } 974 975 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 976 struct nlattr *tb[], struct nlattr *data[]) 977 { 978 struct macvlan_dev *vlan = netdev_priv(dev); 979 struct macvlan_port *port; 980 struct net_device *lowerdev; 981 int err; 982 983 if (!tb[IFLA_LINK]) 984 return -EINVAL; 985 986 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 987 if (lowerdev == NULL) 988 return -ENODEV; 989 990 /* When creating macvlans or macvtaps on top of other macvlans - use 991 * the real device as the lowerdev. 992 */ 993 if (netif_is_macvlan(lowerdev)) 994 lowerdev = macvlan_dev_real_dev(lowerdev); 995 996 if (!tb[IFLA_MTU]) 997 dev->mtu = lowerdev->mtu; 998 else if (dev->mtu > lowerdev->mtu) 999 return -EINVAL; 1000 1001 if (!tb[IFLA_ADDRESS]) 1002 eth_hw_addr_random(dev); 1003 1004 if (!macvlan_port_exists(lowerdev)) { 1005 err = macvlan_port_create(lowerdev); 1006 if (err < 0) 1007 return err; 1008 } 1009 port = macvlan_port_get_rtnl(lowerdev); 1010 1011 /* Only 1 macvlan device can be created in passthru mode */ 1012 if (port->passthru) 1013 return -EINVAL; 1014 1015 vlan->lowerdev = lowerdev; 1016 vlan->dev = dev; 1017 vlan->port = port; 1018 vlan->set_features = MACVLAN_FEATURES; 1019 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1; 1020 1021 vlan->mode = MACVLAN_MODE_VEPA; 1022 if (data && data[IFLA_MACVLAN_MODE]) 1023 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1024 1025 if (data && data[IFLA_MACVLAN_FLAGS]) 1026 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1027 1028 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1029 if (port->count) 1030 return -EINVAL; 1031 port->passthru = true; 1032 eth_hw_addr_inherit(dev, lowerdev); 1033 } 1034 1035 port->count += 1; 1036 err = register_netdevice(dev); 1037 if (err < 0) 1038 goto destroy_port; 1039 1040 dev->priv_flags |= IFF_MACVLAN; 1041 err = netdev_upper_dev_link(lowerdev, dev); 1042 if (err) 1043 goto unregister_netdev; 1044 1045 list_add_tail_rcu(&vlan->list, &port->vlans); 1046 netif_stacked_transfer_operstate(lowerdev, dev); 1047 1048 return 0; 1049 1050 unregister_netdev: 1051 unregister_netdevice(dev); 1052 destroy_port: 1053 port->count -= 1; 1054 if (!port->count) 1055 macvlan_port_destroy(lowerdev); 1056 1057 return err; 1058 } 1059 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1060 1061 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1062 struct nlattr *tb[], struct nlattr *data[]) 1063 { 1064 return macvlan_common_newlink(src_net, dev, tb, data); 1065 } 1066 1067 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1068 { 1069 struct macvlan_dev *vlan = netdev_priv(dev); 1070 1071 list_del_rcu(&vlan->list); 1072 unregister_netdevice_queue(dev, head); 1073 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1074 } 1075 EXPORT_SYMBOL_GPL(macvlan_dellink); 1076 1077 static int macvlan_changelink(struct net_device *dev, 1078 struct nlattr *tb[], struct nlattr *data[]) 1079 { 1080 struct macvlan_dev *vlan = netdev_priv(dev); 1081 enum macvlan_mode mode; 1082 bool set_mode = false; 1083 1084 /* Validate mode, but don't set yet: setting flags may fail. */ 1085 if (data && data[IFLA_MACVLAN_MODE]) { 1086 set_mode = true; 1087 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1088 /* Passthrough mode can't be set or cleared dynamically */ 1089 if ((mode == MACVLAN_MODE_PASSTHRU) != 1090 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1091 return -EINVAL; 1092 } 1093 1094 if (data && data[IFLA_MACVLAN_FLAGS]) { 1095 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1096 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1097 if (vlan->port->passthru && promisc) { 1098 int err; 1099 1100 if (flags & MACVLAN_FLAG_NOPROMISC) 1101 err = dev_set_promiscuity(vlan->lowerdev, -1); 1102 else 1103 err = dev_set_promiscuity(vlan->lowerdev, 1); 1104 if (err < 0) 1105 return err; 1106 } 1107 vlan->flags = flags; 1108 } 1109 if (set_mode) 1110 vlan->mode = mode; 1111 return 0; 1112 } 1113 1114 static size_t macvlan_get_size(const struct net_device *dev) 1115 { 1116 return (0 1117 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1118 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1119 ); 1120 } 1121 1122 static int macvlan_fill_info(struct sk_buff *skb, 1123 const struct net_device *dev) 1124 { 1125 struct macvlan_dev *vlan = netdev_priv(dev); 1126 1127 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1128 goto nla_put_failure; 1129 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1130 goto nla_put_failure; 1131 return 0; 1132 1133 nla_put_failure: 1134 return -EMSGSIZE; 1135 } 1136 1137 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1138 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1139 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1140 }; 1141 1142 int macvlan_link_register(struct rtnl_link_ops *ops) 1143 { 1144 /* common fields */ 1145 ops->priv_size = sizeof(struct macvlan_dev); 1146 ops->validate = macvlan_validate; 1147 ops->maxtype = IFLA_MACVLAN_MAX; 1148 ops->policy = macvlan_policy; 1149 ops->changelink = macvlan_changelink; 1150 ops->get_size = macvlan_get_size; 1151 ops->fill_info = macvlan_fill_info; 1152 1153 return rtnl_link_register(ops); 1154 }; 1155 EXPORT_SYMBOL_GPL(macvlan_link_register); 1156 1157 static struct rtnl_link_ops macvlan_link_ops = { 1158 .kind = "macvlan", 1159 .setup = macvlan_setup, 1160 .newlink = macvlan_newlink, 1161 .dellink = macvlan_dellink, 1162 }; 1163 1164 static int macvlan_device_event(struct notifier_block *unused, 1165 unsigned long event, void *ptr) 1166 { 1167 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1168 struct macvlan_dev *vlan, *next; 1169 struct macvlan_port *port; 1170 LIST_HEAD(list_kill); 1171 1172 if (!macvlan_port_exists(dev)) 1173 return NOTIFY_DONE; 1174 1175 port = macvlan_port_get_rtnl(dev); 1176 1177 switch (event) { 1178 case NETDEV_CHANGE: 1179 list_for_each_entry(vlan, &port->vlans, list) 1180 netif_stacked_transfer_operstate(vlan->lowerdev, 1181 vlan->dev); 1182 break; 1183 case NETDEV_FEAT_CHANGE: 1184 list_for_each_entry(vlan, &port->vlans, list) { 1185 vlan->dev->gso_max_size = dev->gso_max_size; 1186 netdev_update_features(vlan->dev); 1187 } 1188 break; 1189 case NETDEV_CHANGEMTU: 1190 list_for_each_entry(vlan, &port->vlans, list) { 1191 if (vlan->dev->mtu <= dev->mtu) 1192 continue; 1193 dev_set_mtu(vlan->dev, dev->mtu); 1194 } 1195 break; 1196 case NETDEV_CHANGEADDR: 1197 if (!port->passthru) 1198 return NOTIFY_DONE; 1199 1200 vlan = list_first_entry_or_null(&port->vlans, 1201 struct macvlan_dev, 1202 list); 1203 1204 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1205 return NOTIFY_BAD; 1206 1207 break; 1208 case NETDEV_UNREGISTER: 1209 /* twiddle thumbs on netns device moves */ 1210 if (dev->reg_state != NETREG_UNREGISTERING) 1211 break; 1212 1213 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1214 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1215 unregister_netdevice_many(&list_kill); 1216 break; 1217 case NETDEV_PRE_TYPE_CHANGE: 1218 /* Forbid underlaying device to change its type. */ 1219 return NOTIFY_BAD; 1220 1221 case NETDEV_NOTIFY_PEERS: 1222 case NETDEV_BONDING_FAILOVER: 1223 case NETDEV_RESEND_IGMP: 1224 /* Propagate to all vlans */ 1225 list_for_each_entry(vlan, &port->vlans, list) 1226 call_netdevice_notifiers(event, vlan->dev); 1227 } 1228 return NOTIFY_DONE; 1229 } 1230 1231 static struct notifier_block macvlan_notifier_block __read_mostly = { 1232 .notifier_call = macvlan_device_event, 1233 }; 1234 1235 static int __init macvlan_init_module(void) 1236 { 1237 int err; 1238 1239 register_netdevice_notifier(&macvlan_notifier_block); 1240 1241 err = macvlan_link_register(&macvlan_link_ops); 1242 if (err < 0) 1243 goto err1; 1244 return 0; 1245 err1: 1246 unregister_netdevice_notifier(&macvlan_notifier_block); 1247 return err; 1248 } 1249 1250 static void __exit macvlan_cleanup_module(void) 1251 { 1252 rtnl_link_unregister(&macvlan_link_ops); 1253 unregister_netdevice_notifier(&macvlan_notifier_block); 1254 } 1255 1256 module_init(macvlan_init_module); 1257 module_exit(macvlan_cleanup_module); 1258 1259 MODULE_LICENSE("GPL"); 1260 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1261 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1262 MODULE_ALIAS_RTNL_LINK("macvlan"); 1263