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_BITS 8 39 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS) 40 #define MACVLAN_BC_QUEUE_LEN 1000 41 42 struct macvlan_port { 43 struct net_device *dev; 44 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 45 struct list_head vlans; 46 struct rcu_head rcu; 47 struct sk_buff_head bc_queue; 48 struct work_struct bc_work; 49 bool passthru; 50 int count; 51 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE]; 52 }; 53 54 struct macvlan_source_entry { 55 struct hlist_node hlist; 56 struct macvlan_dev *vlan; 57 unsigned char addr[6+2] __aligned(sizeof(u16)); 58 struct rcu_head rcu; 59 }; 60 61 struct macvlan_skb_cb { 62 const struct macvlan_dev *src; 63 }; 64 65 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 66 67 static void macvlan_port_destroy(struct net_device *dev); 68 69 /* Hash Ethernet address */ 70 static u32 macvlan_eth_hash(const unsigned char *addr) 71 { 72 u64 value = get_unaligned((u64 *)addr); 73 74 /* only want 6 bytes */ 75 #ifdef __BIG_ENDIAN 76 value >>= 16; 77 #else 78 value <<= 16; 79 #endif 80 return hash_64(value, MACVLAN_HASH_BITS); 81 } 82 83 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 84 { 85 return rcu_dereference(dev->rx_handler_data); 86 } 87 88 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 89 { 90 return rtnl_dereference(dev->rx_handler_data); 91 } 92 93 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 94 95 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 96 const unsigned char *addr) 97 { 98 struct macvlan_dev *vlan; 99 u32 idx = macvlan_eth_hash(addr); 100 101 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) { 102 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 103 return vlan; 104 } 105 return NULL; 106 } 107 108 static struct macvlan_source_entry *macvlan_hash_lookup_source( 109 const struct macvlan_dev *vlan, 110 const unsigned char *addr) 111 { 112 struct macvlan_source_entry *entry; 113 u32 idx = macvlan_eth_hash(addr); 114 struct hlist_head *h = &vlan->port->vlan_source_hash[idx]; 115 116 hlist_for_each_entry_rcu(entry, h, hlist) { 117 if (ether_addr_equal_64bits(entry->addr, addr) && 118 entry->vlan == vlan) 119 return entry; 120 } 121 return NULL; 122 } 123 124 static int macvlan_hash_add_source(struct macvlan_dev *vlan, 125 const unsigned char *addr) 126 { 127 struct macvlan_port *port = vlan->port; 128 struct macvlan_source_entry *entry; 129 struct hlist_head *h; 130 131 entry = macvlan_hash_lookup_source(vlan, addr); 132 if (entry) 133 return 0; 134 135 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 136 if (!entry) 137 return -ENOMEM; 138 139 ether_addr_copy(entry->addr, addr); 140 entry->vlan = vlan; 141 h = &port->vlan_source_hash[macvlan_eth_hash(addr)]; 142 hlist_add_head_rcu(&entry->hlist, h); 143 vlan->macaddr_count++; 144 145 return 0; 146 } 147 148 static void macvlan_hash_add(struct macvlan_dev *vlan) 149 { 150 struct macvlan_port *port = vlan->port; 151 const unsigned char *addr = vlan->dev->dev_addr; 152 u32 idx = macvlan_eth_hash(addr); 153 154 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]); 155 } 156 157 static void macvlan_hash_del_source(struct macvlan_source_entry *entry) 158 { 159 hlist_del_rcu(&entry->hlist); 160 kfree_rcu(entry, rcu); 161 } 162 163 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 164 { 165 hlist_del_rcu(&vlan->hlist); 166 if (sync) 167 synchronize_rcu(); 168 } 169 170 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 171 const unsigned char *addr) 172 { 173 macvlan_hash_del(vlan, true); 174 /* Now that we are unhashed it is safe to change the device 175 * address without confusing packet delivery. 176 */ 177 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 178 macvlan_hash_add(vlan); 179 } 180 181 static int macvlan_addr_busy(const struct macvlan_port *port, 182 const unsigned char *addr) 183 { 184 /* Test to see if the specified multicast address is 185 * currently in use by the underlying device or 186 * another macvlan. 187 */ 188 if (ether_addr_equal_64bits(port->dev->dev_addr, addr)) 189 return 1; 190 191 if (macvlan_hash_lookup(port, addr)) 192 return 1; 193 194 return 0; 195 } 196 197 198 static int macvlan_broadcast_one(struct sk_buff *skb, 199 const struct macvlan_dev *vlan, 200 const struct ethhdr *eth, bool local) 201 { 202 struct net_device *dev = vlan->dev; 203 204 if (local) 205 return __dev_forward_skb(dev, skb); 206 207 skb->dev = dev; 208 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 209 skb->pkt_type = PACKET_BROADCAST; 210 else 211 skb->pkt_type = PACKET_MULTICAST; 212 213 return 0; 214 } 215 216 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 217 { 218 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 219 } 220 221 222 static unsigned int mc_hash(const struct macvlan_dev *vlan, 223 const unsigned char *addr) 224 { 225 u32 val = __get_unaligned_cpu32(addr + 2); 226 227 val ^= macvlan_hash_mix(vlan); 228 return hash_32(val, MACVLAN_MC_FILTER_BITS); 229 } 230 231 static void macvlan_broadcast(struct sk_buff *skb, 232 const struct macvlan_port *port, 233 struct net_device *src, 234 enum macvlan_mode mode) 235 { 236 const struct ethhdr *eth = eth_hdr(skb); 237 const struct macvlan_dev *vlan; 238 struct sk_buff *nskb; 239 unsigned int i; 240 int err; 241 unsigned int hash; 242 243 if (skb->protocol == htons(ETH_P_PAUSE)) 244 return; 245 246 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 247 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 248 if (vlan->dev == src || !(vlan->mode & mode)) 249 continue; 250 251 hash = mc_hash(vlan, eth->h_dest); 252 if (!test_bit(hash, vlan->mc_filter)) 253 continue; 254 255 err = NET_RX_DROP; 256 nskb = skb_clone(skb, GFP_ATOMIC); 257 if (likely(nskb)) 258 err = macvlan_broadcast_one( 259 nskb, vlan, eth, 260 mode == MACVLAN_MODE_BRIDGE) ?: 261 netif_rx_ni(nskb); 262 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 263 err == NET_RX_SUCCESS, true); 264 } 265 } 266 } 267 268 static void macvlan_process_broadcast(struct work_struct *w) 269 { 270 struct macvlan_port *port = container_of(w, struct macvlan_port, 271 bc_work); 272 struct sk_buff *skb; 273 struct sk_buff_head list; 274 275 __skb_queue_head_init(&list); 276 277 spin_lock_bh(&port->bc_queue.lock); 278 skb_queue_splice_tail_init(&port->bc_queue, &list); 279 spin_unlock_bh(&port->bc_queue.lock); 280 281 while ((skb = __skb_dequeue(&list))) { 282 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 283 284 rcu_read_lock(); 285 286 if (!src) 287 /* frame comes from an external address */ 288 macvlan_broadcast(skb, port, NULL, 289 MACVLAN_MODE_PRIVATE | 290 MACVLAN_MODE_VEPA | 291 MACVLAN_MODE_PASSTHRU| 292 MACVLAN_MODE_BRIDGE); 293 else if (src->mode == MACVLAN_MODE_VEPA) 294 /* flood to everyone except source */ 295 macvlan_broadcast(skb, port, src->dev, 296 MACVLAN_MODE_VEPA | 297 MACVLAN_MODE_BRIDGE); 298 else 299 /* 300 * flood only to VEPA ports, bridge ports 301 * already saw the frame on the way out. 302 */ 303 macvlan_broadcast(skb, port, src->dev, 304 MACVLAN_MODE_VEPA); 305 306 rcu_read_unlock(); 307 308 kfree_skb(skb); 309 } 310 } 311 312 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 313 struct sk_buff *skb) 314 { 315 struct sk_buff *nskb; 316 int err = -ENOMEM; 317 318 nskb = skb_clone(skb, GFP_ATOMIC); 319 if (!nskb) 320 goto err; 321 322 spin_lock(&port->bc_queue.lock); 323 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) { 324 __skb_queue_tail(&port->bc_queue, nskb); 325 err = 0; 326 } 327 spin_unlock(&port->bc_queue.lock); 328 329 if (err) 330 goto free_nskb; 331 332 schedule_work(&port->bc_work); 333 return; 334 335 free_nskb: 336 kfree_skb(nskb); 337 err: 338 atomic_long_inc(&skb->dev->rx_dropped); 339 } 340 341 static void macvlan_flush_sources(struct macvlan_port *port, 342 struct macvlan_dev *vlan) 343 { 344 int i; 345 346 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 347 struct hlist_node *h, *n; 348 349 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) { 350 struct macvlan_source_entry *entry; 351 352 entry = hlist_entry(h, struct macvlan_source_entry, 353 hlist); 354 if (entry->vlan == vlan) 355 macvlan_hash_del_source(entry); 356 } 357 } 358 vlan->macaddr_count = 0; 359 } 360 361 static void macvlan_forward_source_one(struct sk_buff *skb, 362 struct macvlan_dev *vlan) 363 { 364 struct sk_buff *nskb; 365 struct net_device *dev; 366 int len; 367 int ret; 368 369 dev = vlan->dev; 370 if (unlikely(!(dev->flags & IFF_UP))) 371 return; 372 373 nskb = skb_clone(skb, GFP_ATOMIC); 374 if (!nskb) 375 return; 376 377 len = nskb->len + ETH_HLEN; 378 nskb->dev = dev; 379 nskb->pkt_type = PACKET_HOST; 380 381 ret = netif_rx(nskb); 382 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 383 } 384 385 static void macvlan_forward_source(struct sk_buff *skb, 386 struct macvlan_port *port, 387 const unsigned char *addr) 388 { 389 struct macvlan_source_entry *entry; 390 u32 idx = macvlan_eth_hash(addr); 391 struct hlist_head *h = &port->vlan_source_hash[idx]; 392 393 hlist_for_each_entry_rcu(entry, h, hlist) { 394 if (ether_addr_equal_64bits(entry->addr, addr)) 395 if (entry->vlan->dev->flags & IFF_UP) 396 macvlan_forward_source_one(skb, entry->vlan); 397 } 398 } 399 400 /* called under rcu_read_lock() from netif_receive_skb */ 401 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 402 { 403 struct macvlan_port *port; 404 struct sk_buff *skb = *pskb; 405 const struct ethhdr *eth = eth_hdr(skb); 406 const struct macvlan_dev *vlan; 407 const struct macvlan_dev *src; 408 struct net_device *dev; 409 unsigned int len = 0; 410 int ret; 411 rx_handler_result_t handle_res; 412 413 port = macvlan_port_get_rcu(skb->dev); 414 if (is_multicast_ether_addr(eth->h_dest)) { 415 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN); 416 if (!skb) 417 return RX_HANDLER_CONSUMED; 418 eth = eth_hdr(skb); 419 macvlan_forward_source(skb, port, eth->h_source); 420 src = macvlan_hash_lookup(port, eth->h_source); 421 if (src && src->mode != MACVLAN_MODE_VEPA && 422 src->mode != MACVLAN_MODE_BRIDGE) { 423 /* forward to original port. */ 424 vlan = src; 425 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 426 netif_rx(skb); 427 handle_res = RX_HANDLER_CONSUMED; 428 goto out; 429 } 430 431 MACVLAN_SKB_CB(skb)->src = src; 432 macvlan_broadcast_enqueue(port, skb); 433 434 return RX_HANDLER_PASS; 435 } 436 437 macvlan_forward_source(skb, port, eth->h_source); 438 if (port->passthru) 439 vlan = list_first_or_null_rcu(&port->vlans, 440 struct macvlan_dev, list); 441 else 442 vlan = macvlan_hash_lookup(port, eth->h_dest); 443 if (vlan == NULL) 444 return RX_HANDLER_PASS; 445 446 dev = vlan->dev; 447 if (unlikely(!(dev->flags & IFF_UP))) { 448 kfree_skb(skb); 449 return RX_HANDLER_CONSUMED; 450 } 451 len = skb->len + ETH_HLEN; 452 skb = skb_share_check(skb, GFP_ATOMIC); 453 if (!skb) { 454 ret = NET_RX_DROP; 455 handle_res = RX_HANDLER_CONSUMED; 456 goto out; 457 } 458 459 skb->dev = dev; 460 skb->pkt_type = PACKET_HOST; 461 462 ret = NET_RX_SUCCESS; 463 handle_res = RX_HANDLER_ANOTHER; 464 out: 465 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 466 return handle_res; 467 } 468 469 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 470 { 471 const struct macvlan_dev *vlan = netdev_priv(dev); 472 const struct macvlan_port *port = vlan->port; 473 const struct macvlan_dev *dest; 474 475 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 476 const struct ethhdr *eth = (void *)skb->data; 477 478 /* send to other bridge ports directly */ 479 if (is_multicast_ether_addr(eth->h_dest)) { 480 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 481 goto xmit_world; 482 } 483 484 dest = macvlan_hash_lookup(port, eth->h_dest); 485 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 486 /* send to lowerdev first for its network taps */ 487 dev_forward_skb(vlan->lowerdev, skb); 488 489 return NET_XMIT_SUCCESS; 490 } 491 } 492 493 xmit_world: 494 skb->dev = vlan->lowerdev; 495 return dev_queue_xmit(skb); 496 } 497 498 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 499 { 500 #ifdef CONFIG_NET_POLL_CONTROLLER 501 if (vlan->netpoll) 502 netpoll_send_skb(vlan->netpoll, skb); 503 #else 504 BUG(); 505 #endif 506 return NETDEV_TX_OK; 507 } 508 509 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 510 struct net_device *dev) 511 { 512 unsigned int len = skb->len; 513 int ret; 514 struct macvlan_dev *vlan = netdev_priv(dev); 515 516 if (unlikely(netpoll_tx_running(dev))) 517 return macvlan_netpoll_send_skb(vlan, skb); 518 519 if (vlan->fwd_priv) { 520 skb->dev = vlan->lowerdev; 521 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); 522 } else { 523 ret = macvlan_queue_xmit(skb, dev); 524 } 525 526 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 527 struct vlan_pcpu_stats *pcpu_stats; 528 529 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 530 u64_stats_update_begin(&pcpu_stats->syncp); 531 pcpu_stats->tx_packets++; 532 pcpu_stats->tx_bytes += len; 533 u64_stats_update_end(&pcpu_stats->syncp); 534 } else { 535 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 536 } 537 return ret; 538 } 539 540 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 541 unsigned short type, const void *daddr, 542 const void *saddr, unsigned len) 543 { 544 const struct macvlan_dev *vlan = netdev_priv(dev); 545 struct net_device *lowerdev = vlan->lowerdev; 546 547 return dev_hard_header(skb, lowerdev, type, daddr, 548 saddr ? : dev->dev_addr, len); 549 } 550 551 static const struct header_ops macvlan_hard_header_ops = { 552 .create = macvlan_hard_header, 553 .parse = eth_header_parse, 554 .cache = eth_header_cache, 555 .cache_update = eth_header_cache_update, 556 }; 557 558 static struct rtnl_link_ops macvlan_link_ops; 559 560 static int macvlan_open(struct net_device *dev) 561 { 562 struct macvlan_dev *vlan = netdev_priv(dev); 563 struct net_device *lowerdev = vlan->lowerdev; 564 int err; 565 566 if (vlan->port->passthru) { 567 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 568 err = dev_set_promiscuity(lowerdev, 1); 569 if (err < 0) 570 goto out; 571 } 572 goto hash_add; 573 } 574 575 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && 576 dev->rtnl_link_ops == &macvlan_link_ops) { 577 vlan->fwd_priv = 578 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 579 580 /* If we get a NULL pointer back, or if we get an error 581 * then we should just fall through to the non accelerated path 582 */ 583 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 584 vlan->fwd_priv = NULL; 585 } else 586 return 0; 587 } 588 589 err = -EBUSY; 590 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 591 goto out; 592 593 err = dev_uc_add(lowerdev, dev->dev_addr); 594 if (err < 0) 595 goto out; 596 if (dev->flags & IFF_ALLMULTI) { 597 err = dev_set_allmulti(lowerdev, 1); 598 if (err < 0) 599 goto del_unicast; 600 } 601 602 if (dev->flags & IFF_PROMISC) { 603 err = dev_set_promiscuity(lowerdev, 1); 604 if (err < 0) 605 goto clear_multi; 606 } 607 608 hash_add: 609 macvlan_hash_add(vlan); 610 return 0; 611 612 clear_multi: 613 dev_set_allmulti(lowerdev, -1); 614 del_unicast: 615 dev_uc_del(lowerdev, dev->dev_addr); 616 out: 617 if (vlan->fwd_priv) { 618 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 619 vlan->fwd_priv); 620 vlan->fwd_priv = NULL; 621 } 622 return err; 623 } 624 625 static int macvlan_stop(struct net_device *dev) 626 { 627 struct macvlan_dev *vlan = netdev_priv(dev); 628 struct net_device *lowerdev = vlan->lowerdev; 629 630 if (vlan->fwd_priv) { 631 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 632 vlan->fwd_priv); 633 vlan->fwd_priv = NULL; 634 return 0; 635 } 636 637 dev_uc_unsync(lowerdev, dev); 638 dev_mc_unsync(lowerdev, dev); 639 640 if (vlan->port->passthru) { 641 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 642 dev_set_promiscuity(lowerdev, -1); 643 goto hash_del; 644 } 645 646 if (dev->flags & IFF_ALLMULTI) 647 dev_set_allmulti(lowerdev, -1); 648 649 if (dev->flags & IFF_PROMISC) 650 dev_set_promiscuity(lowerdev, -1); 651 652 dev_uc_del(lowerdev, dev->dev_addr); 653 654 hash_del: 655 macvlan_hash_del(vlan, !dev->dismantle); 656 return 0; 657 } 658 659 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 660 { 661 struct macvlan_dev *vlan = netdev_priv(dev); 662 struct net_device *lowerdev = vlan->lowerdev; 663 int err; 664 665 if (!(dev->flags & IFF_UP)) { 666 /* Just copy in the new address */ 667 ether_addr_copy(dev->dev_addr, addr); 668 } else { 669 /* Rehash and update the device filters */ 670 if (macvlan_addr_busy(vlan->port, addr)) 671 return -EBUSY; 672 673 if (!vlan->port->passthru) { 674 err = dev_uc_add(lowerdev, addr); 675 if (err) 676 return err; 677 678 dev_uc_del(lowerdev, dev->dev_addr); 679 } 680 681 macvlan_hash_change_addr(vlan, addr); 682 } 683 return 0; 684 } 685 686 static int macvlan_set_mac_address(struct net_device *dev, void *p) 687 { 688 struct macvlan_dev *vlan = netdev_priv(dev); 689 struct sockaddr *addr = p; 690 691 if (!is_valid_ether_addr(addr->sa_data)) 692 return -EADDRNOTAVAIL; 693 694 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 695 dev_set_mac_address(vlan->lowerdev, addr); 696 return 0; 697 } 698 699 return macvlan_sync_address(dev, addr->sa_data); 700 } 701 702 static void macvlan_change_rx_flags(struct net_device *dev, int change) 703 { 704 struct macvlan_dev *vlan = netdev_priv(dev); 705 struct net_device *lowerdev = vlan->lowerdev; 706 707 if (dev->flags & IFF_UP) { 708 if (change & IFF_ALLMULTI) 709 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 710 if (change & IFF_PROMISC) 711 dev_set_promiscuity(lowerdev, 712 dev->flags & IFF_PROMISC ? 1 : -1); 713 714 } 715 } 716 717 static void macvlan_set_mac_lists(struct net_device *dev) 718 { 719 struct macvlan_dev *vlan = netdev_priv(dev); 720 721 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 722 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); 723 } else { 724 struct netdev_hw_addr *ha; 725 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 726 727 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 728 netdev_for_each_mc_addr(ha, dev) { 729 __set_bit(mc_hash(vlan, ha->addr), filter); 730 } 731 732 __set_bit(mc_hash(vlan, dev->broadcast), filter); 733 734 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); 735 } 736 dev_uc_sync(vlan->lowerdev, dev); 737 dev_mc_sync(vlan->lowerdev, dev); 738 } 739 740 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 741 { 742 struct macvlan_dev *vlan = netdev_priv(dev); 743 744 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 745 return -EINVAL; 746 dev->mtu = new_mtu; 747 return 0; 748 } 749 750 /* 751 * macvlan network devices have devices nesting below it and are a special 752 * "super class" of normal network devices; split their locks off into a 753 * separate class since they always nest. 754 */ 755 static struct lock_class_key macvlan_netdev_xmit_lock_key; 756 static struct lock_class_key macvlan_netdev_addr_lock_key; 757 758 #define ALWAYS_ON_FEATURES \ 759 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \ 760 NETIF_F_GSO_ROBUST) 761 762 #define MACVLAN_FEATURES \ 763 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 764 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \ 765 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 766 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 767 768 #define MACVLAN_STATE_MASK \ 769 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 770 771 static int macvlan_get_nest_level(struct net_device *dev) 772 { 773 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 774 } 775 776 static void macvlan_set_lockdep_class_one(struct net_device *dev, 777 struct netdev_queue *txq, 778 void *_unused) 779 { 780 lockdep_set_class(&txq->_xmit_lock, 781 &macvlan_netdev_xmit_lock_key); 782 } 783 784 static void macvlan_set_lockdep_class(struct net_device *dev) 785 { 786 lockdep_set_class_and_subclass(&dev->addr_list_lock, 787 &macvlan_netdev_addr_lock_key, 788 macvlan_get_nest_level(dev)); 789 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 790 } 791 792 static int macvlan_init(struct net_device *dev) 793 { 794 struct macvlan_dev *vlan = netdev_priv(dev); 795 const struct net_device *lowerdev = vlan->lowerdev; 796 797 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 798 (lowerdev->state & MACVLAN_STATE_MASK); 799 dev->features = lowerdev->features & MACVLAN_FEATURES; 800 dev->features |= ALWAYS_ON_FEATURES; 801 dev->hw_features |= NETIF_F_LRO; 802 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 803 dev->gso_max_size = lowerdev->gso_max_size; 804 dev->hard_header_len = lowerdev->hard_header_len; 805 806 macvlan_set_lockdep_class(dev); 807 808 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 809 if (!vlan->pcpu_stats) 810 return -ENOMEM; 811 812 return 0; 813 } 814 815 static void macvlan_uninit(struct net_device *dev) 816 { 817 struct macvlan_dev *vlan = netdev_priv(dev); 818 struct macvlan_port *port = vlan->port; 819 820 free_percpu(vlan->pcpu_stats); 821 822 macvlan_flush_sources(port, vlan); 823 port->count -= 1; 824 if (!port->count) 825 macvlan_port_destroy(port->dev); 826 } 827 828 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 829 struct rtnl_link_stats64 *stats) 830 { 831 struct macvlan_dev *vlan = netdev_priv(dev); 832 833 if (vlan->pcpu_stats) { 834 struct vlan_pcpu_stats *p; 835 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 836 u32 rx_errors = 0, tx_dropped = 0; 837 unsigned int start; 838 int i; 839 840 for_each_possible_cpu(i) { 841 p = per_cpu_ptr(vlan->pcpu_stats, i); 842 do { 843 start = u64_stats_fetch_begin_irq(&p->syncp); 844 rx_packets = p->rx_packets; 845 rx_bytes = p->rx_bytes; 846 rx_multicast = p->rx_multicast; 847 tx_packets = p->tx_packets; 848 tx_bytes = p->tx_bytes; 849 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 850 851 stats->rx_packets += rx_packets; 852 stats->rx_bytes += rx_bytes; 853 stats->multicast += rx_multicast; 854 stats->tx_packets += tx_packets; 855 stats->tx_bytes += tx_bytes; 856 /* rx_errors & tx_dropped are u32, updated 857 * without syncp protection. 858 */ 859 rx_errors += p->rx_errors; 860 tx_dropped += p->tx_dropped; 861 } 862 stats->rx_errors = rx_errors; 863 stats->rx_dropped = rx_errors; 864 stats->tx_dropped = tx_dropped; 865 } 866 return stats; 867 } 868 869 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 870 __be16 proto, u16 vid) 871 { 872 struct macvlan_dev *vlan = netdev_priv(dev); 873 struct net_device *lowerdev = vlan->lowerdev; 874 875 return vlan_vid_add(lowerdev, proto, vid); 876 } 877 878 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 879 __be16 proto, u16 vid) 880 { 881 struct macvlan_dev *vlan = netdev_priv(dev); 882 struct net_device *lowerdev = vlan->lowerdev; 883 884 vlan_vid_del(lowerdev, proto, vid); 885 return 0; 886 } 887 888 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 889 struct net_device *dev, 890 const unsigned char *addr, u16 vid, 891 u16 flags) 892 { 893 struct macvlan_dev *vlan = netdev_priv(dev); 894 int err = -EINVAL; 895 896 /* Support unicast filter only on passthru devices. 897 * Multicast filter should be allowed on all devices. 898 */ 899 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 900 return -EOPNOTSUPP; 901 902 if (flags & NLM_F_REPLACE) 903 return -EOPNOTSUPP; 904 905 if (is_unicast_ether_addr(addr)) 906 err = dev_uc_add_excl(dev, addr); 907 else if (is_multicast_ether_addr(addr)) 908 err = dev_mc_add_excl(dev, addr); 909 910 return err; 911 } 912 913 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 914 struct net_device *dev, 915 const unsigned char *addr, u16 vid) 916 { 917 struct macvlan_dev *vlan = netdev_priv(dev); 918 int err = -EINVAL; 919 920 /* Support unicast filter only on passthru devices. 921 * Multicast filter should be allowed on all devices. 922 */ 923 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 924 return -EOPNOTSUPP; 925 926 if (is_unicast_ether_addr(addr)) 927 err = dev_uc_del(dev, addr); 928 else if (is_multicast_ether_addr(addr)) 929 err = dev_mc_del(dev, addr); 930 931 return err; 932 } 933 934 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 935 struct ethtool_drvinfo *drvinfo) 936 { 937 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 938 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 939 } 940 941 static int macvlan_ethtool_get_settings(struct net_device *dev, 942 struct ethtool_cmd *cmd) 943 { 944 const struct macvlan_dev *vlan = netdev_priv(dev); 945 946 return __ethtool_get_settings(vlan->lowerdev, cmd); 947 } 948 949 static netdev_features_t macvlan_fix_features(struct net_device *dev, 950 netdev_features_t features) 951 { 952 struct macvlan_dev *vlan = netdev_priv(dev); 953 netdev_features_t lowerdev_features = vlan->lowerdev->features; 954 netdev_features_t mask; 955 956 features |= NETIF_F_ALL_FOR_ALL; 957 features &= (vlan->set_features | ~MACVLAN_FEATURES); 958 mask = features; 959 960 lowerdev_features &= (features | ~NETIF_F_LRO); 961 features = netdev_increment_features(lowerdev_features, features, mask); 962 features |= ALWAYS_ON_FEATURES; 963 features &= ~NETIF_F_NETNS_LOCAL; 964 965 return features; 966 } 967 968 #ifdef CONFIG_NET_POLL_CONTROLLER 969 static void macvlan_dev_poll_controller(struct net_device *dev) 970 { 971 return; 972 } 973 974 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 975 { 976 struct macvlan_dev *vlan = netdev_priv(dev); 977 struct net_device *real_dev = vlan->lowerdev; 978 struct netpoll *netpoll; 979 int err = 0; 980 981 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 982 err = -ENOMEM; 983 if (!netpoll) 984 goto out; 985 986 err = __netpoll_setup(netpoll, real_dev); 987 if (err) { 988 kfree(netpoll); 989 goto out; 990 } 991 992 vlan->netpoll = netpoll; 993 994 out: 995 return err; 996 } 997 998 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 999 { 1000 struct macvlan_dev *vlan = netdev_priv(dev); 1001 struct netpoll *netpoll = vlan->netpoll; 1002 1003 if (!netpoll) 1004 return; 1005 1006 vlan->netpoll = NULL; 1007 1008 __netpoll_free_async(netpoll); 1009 } 1010 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1011 1012 static int macvlan_dev_get_iflink(const struct net_device *dev) 1013 { 1014 struct macvlan_dev *vlan = netdev_priv(dev); 1015 1016 return vlan->lowerdev->ifindex; 1017 } 1018 1019 static const struct ethtool_ops macvlan_ethtool_ops = { 1020 .get_link = ethtool_op_get_link, 1021 .get_settings = macvlan_ethtool_get_settings, 1022 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1023 }; 1024 1025 static const struct net_device_ops macvlan_netdev_ops = { 1026 .ndo_init = macvlan_init, 1027 .ndo_uninit = macvlan_uninit, 1028 .ndo_open = macvlan_open, 1029 .ndo_stop = macvlan_stop, 1030 .ndo_start_xmit = macvlan_start_xmit, 1031 .ndo_change_mtu = macvlan_change_mtu, 1032 .ndo_fix_features = macvlan_fix_features, 1033 .ndo_change_rx_flags = macvlan_change_rx_flags, 1034 .ndo_set_mac_address = macvlan_set_mac_address, 1035 .ndo_set_rx_mode = macvlan_set_mac_lists, 1036 .ndo_get_stats64 = macvlan_dev_get_stats64, 1037 .ndo_validate_addr = eth_validate_addr, 1038 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1039 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1040 .ndo_fdb_add = macvlan_fdb_add, 1041 .ndo_fdb_del = macvlan_fdb_del, 1042 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1043 .ndo_get_lock_subclass = macvlan_get_nest_level, 1044 #ifdef CONFIG_NET_POLL_CONTROLLER 1045 .ndo_poll_controller = macvlan_dev_poll_controller, 1046 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1047 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1048 #endif 1049 .ndo_get_iflink = macvlan_dev_get_iflink, 1050 .ndo_features_check = passthru_features_check, 1051 }; 1052 1053 void macvlan_common_setup(struct net_device *dev) 1054 { 1055 ether_setup(dev); 1056 1057 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1058 netif_keep_dst(dev); 1059 dev->priv_flags |= IFF_UNICAST_FLT; 1060 dev->netdev_ops = &macvlan_netdev_ops; 1061 dev->destructor = free_netdev; 1062 dev->header_ops = &macvlan_hard_header_ops; 1063 dev->ethtool_ops = &macvlan_ethtool_ops; 1064 } 1065 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1066 1067 static void macvlan_setup(struct net_device *dev) 1068 { 1069 macvlan_common_setup(dev); 1070 dev->tx_queue_len = 0; 1071 } 1072 1073 static int macvlan_port_create(struct net_device *dev) 1074 { 1075 struct macvlan_port *port; 1076 unsigned int i; 1077 int err; 1078 1079 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1080 return -EINVAL; 1081 1082 if (netif_is_ipvlan_port(dev)) 1083 return -EBUSY; 1084 1085 port = kzalloc(sizeof(*port), GFP_KERNEL); 1086 if (port == NULL) 1087 return -ENOMEM; 1088 1089 port->passthru = false; 1090 port->dev = dev; 1091 INIT_LIST_HEAD(&port->vlans); 1092 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1093 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1094 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1095 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1096 1097 skb_queue_head_init(&port->bc_queue); 1098 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1099 1100 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1101 if (err) 1102 kfree(port); 1103 else 1104 dev->priv_flags |= IFF_MACVLAN_PORT; 1105 return err; 1106 } 1107 1108 static void macvlan_port_destroy(struct net_device *dev) 1109 { 1110 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1111 1112 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1113 netdev_rx_handler_unregister(dev); 1114 1115 /* After this point, no packet can schedule bc_work anymore, 1116 * but we need to cancel it and purge left skbs if any. 1117 */ 1118 cancel_work_sync(&port->bc_work); 1119 __skb_queue_purge(&port->bc_queue); 1120 1121 kfree_rcu(port, rcu); 1122 } 1123 1124 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 1125 { 1126 if (tb[IFLA_ADDRESS]) { 1127 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1128 return -EINVAL; 1129 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1130 return -EADDRNOTAVAIL; 1131 } 1132 1133 if (data && data[IFLA_MACVLAN_FLAGS] && 1134 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1135 return -EINVAL; 1136 1137 if (data && data[IFLA_MACVLAN_MODE]) { 1138 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1139 case MACVLAN_MODE_PRIVATE: 1140 case MACVLAN_MODE_VEPA: 1141 case MACVLAN_MODE_BRIDGE: 1142 case MACVLAN_MODE_PASSTHRU: 1143 case MACVLAN_MODE_SOURCE: 1144 break; 1145 default: 1146 return -EINVAL; 1147 } 1148 } 1149 1150 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1151 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1152 case MACVLAN_MACADDR_ADD: 1153 case MACVLAN_MACADDR_DEL: 1154 case MACVLAN_MACADDR_FLUSH: 1155 case MACVLAN_MACADDR_SET: 1156 break; 1157 default: 1158 return -EINVAL; 1159 } 1160 } 1161 1162 if (data && data[IFLA_MACVLAN_MACADDR]) { 1163 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1164 return -EINVAL; 1165 1166 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1167 return -EADDRNOTAVAIL; 1168 } 1169 1170 if (data && data[IFLA_MACVLAN_MACADDR_COUNT]) 1171 return -EINVAL; 1172 1173 return 0; 1174 } 1175 1176 /** 1177 * reconfigure list of remote source mac address 1178 * (only for macvlan devices in source mode) 1179 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1180 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1181 */ 1182 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1183 struct nlattr *data[]) 1184 { 1185 char *addr = NULL; 1186 int ret, rem, len; 1187 struct nlattr *nla, *head; 1188 struct macvlan_source_entry *entry; 1189 1190 if (data[IFLA_MACVLAN_MACADDR]) 1191 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1192 1193 if (mode == MACVLAN_MACADDR_ADD) { 1194 if (!addr) 1195 return -EINVAL; 1196 1197 return macvlan_hash_add_source(vlan, addr); 1198 1199 } else if (mode == MACVLAN_MACADDR_DEL) { 1200 if (!addr) 1201 return -EINVAL; 1202 1203 entry = macvlan_hash_lookup_source(vlan, addr); 1204 if (entry) { 1205 macvlan_hash_del_source(entry); 1206 vlan->macaddr_count--; 1207 } 1208 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1209 macvlan_flush_sources(vlan->port, vlan); 1210 } else if (mode == MACVLAN_MACADDR_SET) { 1211 macvlan_flush_sources(vlan->port, vlan); 1212 1213 if (addr) { 1214 ret = macvlan_hash_add_source(vlan, addr); 1215 if (ret) 1216 return ret; 1217 } 1218 1219 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1220 return 0; 1221 1222 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1223 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1224 1225 nla_for_each_attr(nla, head, len, rem) { 1226 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1227 nla_len(nla) != ETH_ALEN) 1228 continue; 1229 1230 addr = nla_data(nla); 1231 ret = macvlan_hash_add_source(vlan, addr); 1232 if (ret) 1233 return ret; 1234 } 1235 } else { 1236 return -EINVAL; 1237 } 1238 1239 return 0; 1240 } 1241 1242 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1243 struct nlattr *tb[], struct nlattr *data[]) 1244 { 1245 struct macvlan_dev *vlan = netdev_priv(dev); 1246 struct macvlan_port *port; 1247 struct net_device *lowerdev; 1248 int err; 1249 int macmode; 1250 1251 if (!tb[IFLA_LINK]) 1252 return -EINVAL; 1253 1254 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1255 if (lowerdev == NULL) 1256 return -ENODEV; 1257 1258 /* When creating macvlans or macvtaps on top of other macvlans - use 1259 * the real device as the lowerdev. 1260 */ 1261 if (netif_is_macvlan(lowerdev)) 1262 lowerdev = macvlan_dev_real_dev(lowerdev); 1263 1264 if (!tb[IFLA_MTU]) 1265 dev->mtu = lowerdev->mtu; 1266 else if (dev->mtu > lowerdev->mtu) 1267 return -EINVAL; 1268 1269 if (!tb[IFLA_ADDRESS]) 1270 eth_hw_addr_random(dev); 1271 1272 if (!macvlan_port_exists(lowerdev)) { 1273 err = macvlan_port_create(lowerdev); 1274 if (err < 0) 1275 return err; 1276 } 1277 port = macvlan_port_get_rtnl(lowerdev); 1278 1279 /* Only 1 macvlan device can be created in passthru mode */ 1280 if (port->passthru) 1281 return -EINVAL; 1282 1283 vlan->lowerdev = lowerdev; 1284 vlan->dev = dev; 1285 vlan->port = port; 1286 vlan->set_features = MACVLAN_FEATURES; 1287 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1; 1288 1289 vlan->mode = MACVLAN_MODE_VEPA; 1290 if (data && data[IFLA_MACVLAN_MODE]) 1291 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1292 1293 if (data && data[IFLA_MACVLAN_FLAGS]) 1294 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1295 1296 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1297 if (port->count) 1298 return -EINVAL; 1299 port->passthru = true; 1300 eth_hw_addr_inherit(dev, lowerdev); 1301 } 1302 1303 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1304 if (vlan->mode != MACVLAN_MODE_SOURCE) 1305 return -EINVAL; 1306 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1307 err = macvlan_changelink_sources(vlan, macmode, data); 1308 if (err) 1309 return err; 1310 } 1311 1312 port->count += 1; 1313 err = register_netdevice(dev); 1314 if (err < 0) 1315 goto destroy_port; 1316 1317 dev->priv_flags |= IFF_MACVLAN; 1318 err = netdev_upper_dev_link(lowerdev, dev); 1319 if (err) 1320 goto unregister_netdev; 1321 1322 list_add_tail_rcu(&vlan->list, &port->vlans); 1323 netif_stacked_transfer_operstate(lowerdev, dev); 1324 1325 return 0; 1326 1327 unregister_netdev: 1328 unregister_netdevice(dev); 1329 destroy_port: 1330 port->count -= 1; 1331 if (!port->count) 1332 macvlan_port_destroy(lowerdev); 1333 1334 return err; 1335 } 1336 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1337 1338 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1339 struct nlattr *tb[], struct nlattr *data[]) 1340 { 1341 return macvlan_common_newlink(src_net, dev, tb, data); 1342 } 1343 1344 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1345 { 1346 struct macvlan_dev *vlan = netdev_priv(dev); 1347 1348 if (vlan->mode == MACVLAN_MODE_SOURCE) 1349 macvlan_flush_sources(vlan->port, vlan); 1350 list_del_rcu(&vlan->list); 1351 unregister_netdevice_queue(dev, head); 1352 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1353 } 1354 EXPORT_SYMBOL_GPL(macvlan_dellink); 1355 1356 static int macvlan_changelink(struct net_device *dev, 1357 struct nlattr *tb[], struct nlattr *data[]) 1358 { 1359 struct macvlan_dev *vlan = netdev_priv(dev); 1360 enum macvlan_mode mode; 1361 bool set_mode = false; 1362 enum macvlan_macaddr_mode macmode; 1363 int ret; 1364 1365 /* Validate mode, but don't set yet: setting flags may fail. */ 1366 if (data && data[IFLA_MACVLAN_MODE]) { 1367 set_mode = true; 1368 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1369 /* Passthrough mode can't be set or cleared dynamically */ 1370 if ((mode == MACVLAN_MODE_PASSTHRU) != 1371 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1372 return -EINVAL; 1373 if (vlan->mode == MACVLAN_MODE_SOURCE && 1374 vlan->mode != mode) 1375 macvlan_flush_sources(vlan->port, vlan); 1376 } 1377 1378 if (data && data[IFLA_MACVLAN_FLAGS]) { 1379 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1380 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1381 if (vlan->port->passthru && promisc) { 1382 int err; 1383 1384 if (flags & MACVLAN_FLAG_NOPROMISC) 1385 err = dev_set_promiscuity(vlan->lowerdev, -1); 1386 else 1387 err = dev_set_promiscuity(vlan->lowerdev, 1); 1388 if (err < 0) 1389 return err; 1390 } 1391 vlan->flags = flags; 1392 } 1393 if (set_mode) 1394 vlan->mode = mode; 1395 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1396 if (vlan->mode != MACVLAN_MODE_SOURCE) 1397 return -EINVAL; 1398 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1399 ret = macvlan_changelink_sources(vlan, macmode, data); 1400 if (ret) 1401 return ret; 1402 } 1403 return 0; 1404 } 1405 1406 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1407 { 1408 if (vlan->macaddr_count == 0) 1409 return 0; 1410 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1411 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1412 } 1413 1414 static size_t macvlan_get_size(const struct net_device *dev) 1415 { 1416 struct macvlan_dev *vlan = netdev_priv(dev); 1417 1418 return (0 1419 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1420 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1421 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1422 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1423 ); 1424 } 1425 1426 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1427 const struct macvlan_dev *vlan, 1428 const int i) 1429 { 1430 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1431 struct macvlan_source_entry *entry; 1432 1433 hlist_for_each_entry_rcu(entry, h, hlist) { 1434 if (entry->vlan != vlan) 1435 continue; 1436 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1437 return 1; 1438 } 1439 return 0; 1440 } 1441 1442 static int macvlan_fill_info(struct sk_buff *skb, 1443 const struct net_device *dev) 1444 { 1445 struct macvlan_dev *vlan = netdev_priv(dev); 1446 int i; 1447 struct nlattr *nest; 1448 1449 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1450 goto nla_put_failure; 1451 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1452 goto nla_put_failure; 1453 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1454 goto nla_put_failure; 1455 if (vlan->macaddr_count > 0) { 1456 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1457 if (nest == NULL) 1458 goto nla_put_failure; 1459 1460 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1461 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1462 goto nla_put_failure; 1463 } 1464 nla_nest_end(skb, nest); 1465 } 1466 return 0; 1467 1468 nla_put_failure: 1469 return -EMSGSIZE; 1470 } 1471 1472 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1473 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1474 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1475 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1476 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1477 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1478 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1479 }; 1480 1481 int macvlan_link_register(struct rtnl_link_ops *ops) 1482 { 1483 /* common fields */ 1484 ops->priv_size = sizeof(struct macvlan_dev); 1485 ops->validate = macvlan_validate; 1486 ops->maxtype = IFLA_MACVLAN_MAX; 1487 ops->policy = macvlan_policy; 1488 ops->changelink = macvlan_changelink; 1489 ops->get_size = macvlan_get_size; 1490 ops->fill_info = macvlan_fill_info; 1491 1492 return rtnl_link_register(ops); 1493 }; 1494 EXPORT_SYMBOL_GPL(macvlan_link_register); 1495 1496 static struct net *macvlan_get_link_net(const struct net_device *dev) 1497 { 1498 return dev_net(macvlan_dev_real_dev(dev)); 1499 } 1500 1501 static struct rtnl_link_ops macvlan_link_ops = { 1502 .kind = "macvlan", 1503 .setup = macvlan_setup, 1504 .newlink = macvlan_newlink, 1505 .dellink = macvlan_dellink, 1506 .get_link_net = macvlan_get_link_net, 1507 }; 1508 1509 static int macvlan_device_event(struct notifier_block *unused, 1510 unsigned long event, void *ptr) 1511 { 1512 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1513 struct macvlan_dev *vlan, *next; 1514 struct macvlan_port *port; 1515 LIST_HEAD(list_kill); 1516 1517 if (!macvlan_port_exists(dev)) 1518 return NOTIFY_DONE; 1519 1520 port = macvlan_port_get_rtnl(dev); 1521 1522 switch (event) { 1523 case NETDEV_CHANGE: 1524 list_for_each_entry(vlan, &port->vlans, list) 1525 netif_stacked_transfer_operstate(vlan->lowerdev, 1526 vlan->dev); 1527 break; 1528 case NETDEV_FEAT_CHANGE: 1529 list_for_each_entry(vlan, &port->vlans, list) { 1530 vlan->dev->gso_max_size = dev->gso_max_size; 1531 netdev_update_features(vlan->dev); 1532 } 1533 break; 1534 case NETDEV_CHANGEMTU: 1535 list_for_each_entry(vlan, &port->vlans, list) { 1536 if (vlan->dev->mtu <= dev->mtu) 1537 continue; 1538 dev_set_mtu(vlan->dev, dev->mtu); 1539 } 1540 break; 1541 case NETDEV_CHANGEADDR: 1542 if (!port->passthru) 1543 return NOTIFY_DONE; 1544 1545 vlan = list_first_entry_or_null(&port->vlans, 1546 struct macvlan_dev, 1547 list); 1548 1549 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1550 return NOTIFY_BAD; 1551 1552 break; 1553 case NETDEV_UNREGISTER: 1554 /* twiddle thumbs on netns device moves */ 1555 if (dev->reg_state != NETREG_UNREGISTERING) 1556 break; 1557 1558 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1559 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1560 unregister_netdevice_many(&list_kill); 1561 break; 1562 case NETDEV_PRE_TYPE_CHANGE: 1563 /* Forbid underlaying device to change its type. */ 1564 return NOTIFY_BAD; 1565 1566 case NETDEV_NOTIFY_PEERS: 1567 case NETDEV_BONDING_FAILOVER: 1568 case NETDEV_RESEND_IGMP: 1569 /* Propagate to all vlans */ 1570 list_for_each_entry(vlan, &port->vlans, list) 1571 call_netdevice_notifiers(event, vlan->dev); 1572 } 1573 return NOTIFY_DONE; 1574 } 1575 1576 static struct notifier_block macvlan_notifier_block __read_mostly = { 1577 .notifier_call = macvlan_device_event, 1578 }; 1579 1580 static int __init macvlan_init_module(void) 1581 { 1582 int err; 1583 1584 register_netdevice_notifier(&macvlan_notifier_block); 1585 1586 err = macvlan_link_register(&macvlan_link_ops); 1587 if (err < 0) 1588 goto err1; 1589 return 0; 1590 err1: 1591 unregister_netdevice_notifier(&macvlan_notifier_block); 1592 return err; 1593 } 1594 1595 static void __exit macvlan_cleanup_module(void) 1596 { 1597 rtnl_link_unregister(&macvlan_link_ops); 1598 unregister_netdevice_notifier(&macvlan_notifier_block); 1599 } 1600 1601 module_init(macvlan_init_module); 1602 module_exit(macvlan_cleanup_module); 1603 1604 MODULE_LICENSE("GPL"); 1605 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1606 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1607 MODULE_ALIAS_RTNL_LINK("macvlan"); 1608