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(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); 416 if (!skb) 417 return RX_HANDLER_CONSUMED; 418 *pskb = skb; 419 eth = eth_hdr(skb); 420 macvlan_forward_source(skb, port, eth->h_source); 421 src = macvlan_hash_lookup(port, eth->h_source); 422 if (src && src->mode != MACVLAN_MODE_VEPA && 423 src->mode != MACVLAN_MODE_BRIDGE) { 424 /* forward to original port. */ 425 vlan = src; 426 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 427 netif_rx(skb); 428 handle_res = RX_HANDLER_CONSUMED; 429 goto out; 430 } 431 432 MACVLAN_SKB_CB(skb)->src = src; 433 macvlan_broadcast_enqueue(port, skb); 434 435 return RX_HANDLER_PASS; 436 } 437 438 macvlan_forward_source(skb, port, eth->h_source); 439 if (port->passthru) 440 vlan = list_first_or_null_rcu(&port->vlans, 441 struct macvlan_dev, list); 442 else 443 vlan = macvlan_hash_lookup(port, eth->h_dest); 444 if (vlan == NULL) 445 return RX_HANDLER_PASS; 446 447 dev = vlan->dev; 448 if (unlikely(!(dev->flags & IFF_UP))) { 449 kfree_skb(skb); 450 return RX_HANDLER_CONSUMED; 451 } 452 len = skb->len + ETH_HLEN; 453 skb = skb_share_check(skb, GFP_ATOMIC); 454 if (!skb) { 455 ret = NET_RX_DROP; 456 handle_res = RX_HANDLER_CONSUMED; 457 goto out; 458 } 459 460 *pskb = skb; 461 skb->dev = dev; 462 skb->pkt_type = PACKET_HOST; 463 464 ret = NET_RX_SUCCESS; 465 handle_res = RX_HANDLER_ANOTHER; 466 out: 467 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 468 return handle_res; 469 } 470 471 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 472 { 473 const struct macvlan_dev *vlan = netdev_priv(dev); 474 const struct macvlan_port *port = vlan->port; 475 const struct macvlan_dev *dest; 476 477 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 478 const struct ethhdr *eth = (void *)skb->data; 479 480 /* send to other bridge ports directly */ 481 if (is_multicast_ether_addr(eth->h_dest)) { 482 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 483 goto xmit_world; 484 } 485 486 dest = macvlan_hash_lookup(port, eth->h_dest); 487 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 488 /* send to lowerdev first for its network taps */ 489 dev_forward_skb(vlan->lowerdev, skb); 490 491 return NET_XMIT_SUCCESS; 492 } 493 } 494 495 xmit_world: 496 skb->dev = vlan->lowerdev; 497 return dev_queue_xmit(skb); 498 } 499 500 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 501 { 502 #ifdef CONFIG_NET_POLL_CONTROLLER 503 if (vlan->netpoll) 504 netpoll_send_skb(vlan->netpoll, skb); 505 #else 506 BUG(); 507 #endif 508 return NETDEV_TX_OK; 509 } 510 511 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 512 struct net_device *dev) 513 { 514 unsigned int len = skb->len; 515 int ret; 516 struct macvlan_dev *vlan = netdev_priv(dev); 517 518 if (unlikely(netpoll_tx_running(dev))) 519 return macvlan_netpoll_send_skb(vlan, skb); 520 521 if (vlan->fwd_priv) { 522 skb->dev = vlan->lowerdev; 523 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); 524 } else { 525 ret = macvlan_queue_xmit(skb, dev); 526 } 527 528 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 529 struct vlan_pcpu_stats *pcpu_stats; 530 531 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 532 u64_stats_update_begin(&pcpu_stats->syncp); 533 pcpu_stats->tx_packets++; 534 pcpu_stats->tx_bytes += len; 535 u64_stats_update_end(&pcpu_stats->syncp); 536 } else { 537 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 538 } 539 return ret; 540 } 541 542 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 543 unsigned short type, const void *daddr, 544 const void *saddr, unsigned len) 545 { 546 const struct macvlan_dev *vlan = netdev_priv(dev); 547 struct net_device *lowerdev = vlan->lowerdev; 548 549 return dev_hard_header(skb, lowerdev, type, daddr, 550 saddr ? : dev->dev_addr, len); 551 } 552 553 static const struct header_ops macvlan_hard_header_ops = { 554 .create = macvlan_hard_header, 555 .parse = eth_header_parse, 556 .cache = eth_header_cache, 557 .cache_update = eth_header_cache_update, 558 }; 559 560 static struct rtnl_link_ops macvlan_link_ops; 561 562 static int macvlan_open(struct net_device *dev) 563 { 564 struct macvlan_dev *vlan = netdev_priv(dev); 565 struct net_device *lowerdev = vlan->lowerdev; 566 int err; 567 568 if (vlan->port->passthru) { 569 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 570 err = dev_set_promiscuity(lowerdev, 1); 571 if (err < 0) 572 goto out; 573 } 574 goto hash_add; 575 } 576 577 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && 578 dev->rtnl_link_ops == &macvlan_link_ops) { 579 vlan->fwd_priv = 580 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 581 582 /* If we get a NULL pointer back, or if we get an error 583 * then we should just fall through to the non accelerated path 584 */ 585 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 586 vlan->fwd_priv = NULL; 587 } else 588 return 0; 589 } 590 591 err = -EBUSY; 592 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 593 goto out; 594 595 err = dev_uc_add(lowerdev, dev->dev_addr); 596 if (err < 0) 597 goto out; 598 if (dev->flags & IFF_ALLMULTI) { 599 err = dev_set_allmulti(lowerdev, 1); 600 if (err < 0) 601 goto del_unicast; 602 } 603 604 if (dev->flags & IFF_PROMISC) { 605 err = dev_set_promiscuity(lowerdev, 1); 606 if (err < 0) 607 goto clear_multi; 608 } 609 610 hash_add: 611 macvlan_hash_add(vlan); 612 return 0; 613 614 clear_multi: 615 dev_set_allmulti(lowerdev, -1); 616 del_unicast: 617 dev_uc_del(lowerdev, dev->dev_addr); 618 out: 619 if (vlan->fwd_priv) { 620 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 621 vlan->fwd_priv); 622 vlan->fwd_priv = NULL; 623 } 624 return err; 625 } 626 627 static int macvlan_stop(struct net_device *dev) 628 { 629 struct macvlan_dev *vlan = netdev_priv(dev); 630 struct net_device *lowerdev = vlan->lowerdev; 631 632 if (vlan->fwd_priv) { 633 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 634 vlan->fwd_priv); 635 vlan->fwd_priv = NULL; 636 return 0; 637 } 638 639 dev_uc_unsync(lowerdev, dev); 640 dev_mc_unsync(lowerdev, dev); 641 642 if (vlan->port->passthru) { 643 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 644 dev_set_promiscuity(lowerdev, -1); 645 goto hash_del; 646 } 647 648 if (dev->flags & IFF_ALLMULTI) 649 dev_set_allmulti(lowerdev, -1); 650 651 if (dev->flags & IFF_PROMISC) 652 dev_set_promiscuity(lowerdev, -1); 653 654 dev_uc_del(lowerdev, dev->dev_addr); 655 656 hash_del: 657 macvlan_hash_del(vlan, !dev->dismantle); 658 return 0; 659 } 660 661 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 662 { 663 struct macvlan_dev *vlan = netdev_priv(dev); 664 struct net_device *lowerdev = vlan->lowerdev; 665 int err; 666 667 if (!(dev->flags & IFF_UP)) { 668 /* Just copy in the new address */ 669 ether_addr_copy(dev->dev_addr, addr); 670 } else { 671 /* Rehash and update the device filters */ 672 if (macvlan_addr_busy(vlan->port, addr)) 673 return -EBUSY; 674 675 if (!vlan->port->passthru) { 676 err = dev_uc_add(lowerdev, addr); 677 if (err) 678 return err; 679 680 dev_uc_del(lowerdev, dev->dev_addr); 681 } 682 683 macvlan_hash_change_addr(vlan, addr); 684 } 685 return 0; 686 } 687 688 static int macvlan_set_mac_address(struct net_device *dev, void *p) 689 { 690 struct macvlan_dev *vlan = netdev_priv(dev); 691 struct sockaddr *addr = p; 692 693 if (!is_valid_ether_addr(addr->sa_data)) 694 return -EADDRNOTAVAIL; 695 696 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 697 dev_set_mac_address(vlan->lowerdev, addr); 698 return 0; 699 } 700 701 return macvlan_sync_address(dev, addr->sa_data); 702 } 703 704 static void macvlan_change_rx_flags(struct net_device *dev, int change) 705 { 706 struct macvlan_dev *vlan = netdev_priv(dev); 707 struct net_device *lowerdev = vlan->lowerdev; 708 709 if (dev->flags & IFF_UP) { 710 if (change & IFF_ALLMULTI) 711 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 712 if (change & IFF_PROMISC) 713 dev_set_promiscuity(lowerdev, 714 dev->flags & IFF_PROMISC ? 1 : -1); 715 716 } 717 } 718 719 static void macvlan_set_mac_lists(struct net_device *dev) 720 { 721 struct macvlan_dev *vlan = netdev_priv(dev); 722 723 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 724 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); 725 } else { 726 struct netdev_hw_addr *ha; 727 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 728 729 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 730 netdev_for_each_mc_addr(ha, dev) { 731 __set_bit(mc_hash(vlan, ha->addr), filter); 732 } 733 734 __set_bit(mc_hash(vlan, dev->broadcast), filter); 735 736 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); 737 } 738 dev_uc_sync(vlan->lowerdev, dev); 739 dev_mc_sync(vlan->lowerdev, dev); 740 } 741 742 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 743 { 744 struct macvlan_dev *vlan = netdev_priv(dev); 745 746 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 747 return -EINVAL; 748 dev->mtu = new_mtu; 749 return 0; 750 } 751 752 /* 753 * macvlan network devices have devices nesting below it and are a special 754 * "super class" of normal network devices; split their locks off into a 755 * separate class since they always nest. 756 */ 757 static struct lock_class_key macvlan_netdev_xmit_lock_key; 758 static struct lock_class_key macvlan_netdev_addr_lock_key; 759 760 #define ALWAYS_ON_FEATURES \ 761 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \ 762 NETIF_F_GSO_ROBUST) 763 764 #define MACVLAN_FEATURES \ 765 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 766 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \ 767 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 768 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 769 770 #define MACVLAN_STATE_MASK \ 771 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 772 773 static int macvlan_get_nest_level(struct net_device *dev) 774 { 775 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 776 } 777 778 static void macvlan_set_lockdep_class_one(struct net_device *dev, 779 struct netdev_queue *txq, 780 void *_unused) 781 { 782 lockdep_set_class(&txq->_xmit_lock, 783 &macvlan_netdev_xmit_lock_key); 784 } 785 786 static void macvlan_set_lockdep_class(struct net_device *dev) 787 { 788 lockdep_set_class_and_subclass(&dev->addr_list_lock, 789 &macvlan_netdev_addr_lock_key, 790 macvlan_get_nest_level(dev)); 791 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 792 } 793 794 static int macvlan_init(struct net_device *dev) 795 { 796 struct macvlan_dev *vlan = netdev_priv(dev); 797 const struct net_device *lowerdev = vlan->lowerdev; 798 799 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 800 (lowerdev->state & MACVLAN_STATE_MASK); 801 dev->features = lowerdev->features & MACVLAN_FEATURES; 802 dev->features |= ALWAYS_ON_FEATURES; 803 dev->hw_features |= NETIF_F_LRO; 804 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 805 dev->gso_max_size = lowerdev->gso_max_size; 806 dev->hard_header_len = lowerdev->hard_header_len; 807 808 macvlan_set_lockdep_class(dev); 809 810 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 811 if (!vlan->pcpu_stats) 812 return -ENOMEM; 813 814 return 0; 815 } 816 817 static void macvlan_uninit(struct net_device *dev) 818 { 819 struct macvlan_dev *vlan = netdev_priv(dev); 820 struct macvlan_port *port = vlan->port; 821 822 free_percpu(vlan->pcpu_stats); 823 824 macvlan_flush_sources(port, vlan); 825 port->count -= 1; 826 if (!port->count) 827 macvlan_port_destroy(port->dev); 828 } 829 830 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 831 struct rtnl_link_stats64 *stats) 832 { 833 struct macvlan_dev *vlan = netdev_priv(dev); 834 835 if (vlan->pcpu_stats) { 836 struct vlan_pcpu_stats *p; 837 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 838 u32 rx_errors = 0, tx_dropped = 0; 839 unsigned int start; 840 int i; 841 842 for_each_possible_cpu(i) { 843 p = per_cpu_ptr(vlan->pcpu_stats, i); 844 do { 845 start = u64_stats_fetch_begin_irq(&p->syncp); 846 rx_packets = p->rx_packets; 847 rx_bytes = p->rx_bytes; 848 rx_multicast = p->rx_multicast; 849 tx_packets = p->tx_packets; 850 tx_bytes = p->tx_bytes; 851 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 852 853 stats->rx_packets += rx_packets; 854 stats->rx_bytes += rx_bytes; 855 stats->multicast += rx_multicast; 856 stats->tx_packets += tx_packets; 857 stats->tx_bytes += tx_bytes; 858 /* rx_errors & tx_dropped are u32, updated 859 * without syncp protection. 860 */ 861 rx_errors += p->rx_errors; 862 tx_dropped += p->tx_dropped; 863 } 864 stats->rx_errors = rx_errors; 865 stats->rx_dropped = rx_errors; 866 stats->tx_dropped = tx_dropped; 867 } 868 return stats; 869 } 870 871 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 872 __be16 proto, u16 vid) 873 { 874 struct macvlan_dev *vlan = netdev_priv(dev); 875 struct net_device *lowerdev = vlan->lowerdev; 876 877 return vlan_vid_add(lowerdev, proto, vid); 878 } 879 880 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 881 __be16 proto, u16 vid) 882 { 883 struct macvlan_dev *vlan = netdev_priv(dev); 884 struct net_device *lowerdev = vlan->lowerdev; 885 886 vlan_vid_del(lowerdev, proto, vid); 887 return 0; 888 } 889 890 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 891 struct net_device *dev, 892 const unsigned char *addr, u16 vid, 893 u16 flags) 894 { 895 struct macvlan_dev *vlan = netdev_priv(dev); 896 int err = -EINVAL; 897 898 /* Support unicast filter only on passthru devices. 899 * Multicast filter should be allowed on all devices. 900 */ 901 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 902 return -EOPNOTSUPP; 903 904 if (flags & NLM_F_REPLACE) 905 return -EOPNOTSUPP; 906 907 if (is_unicast_ether_addr(addr)) 908 err = dev_uc_add_excl(dev, addr); 909 else if (is_multicast_ether_addr(addr)) 910 err = dev_mc_add_excl(dev, addr); 911 912 return err; 913 } 914 915 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 916 struct net_device *dev, 917 const unsigned char *addr, u16 vid) 918 { 919 struct macvlan_dev *vlan = netdev_priv(dev); 920 int err = -EINVAL; 921 922 /* Support unicast filter only on passthru devices. 923 * Multicast filter should be allowed on all devices. 924 */ 925 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 926 return -EOPNOTSUPP; 927 928 if (is_unicast_ether_addr(addr)) 929 err = dev_uc_del(dev, addr); 930 else if (is_multicast_ether_addr(addr)) 931 err = dev_mc_del(dev, addr); 932 933 return err; 934 } 935 936 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 937 struct ethtool_drvinfo *drvinfo) 938 { 939 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 940 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 941 } 942 943 static int macvlan_ethtool_get_settings(struct net_device *dev, 944 struct ethtool_cmd *cmd) 945 { 946 const struct macvlan_dev *vlan = netdev_priv(dev); 947 948 return __ethtool_get_settings(vlan->lowerdev, cmd); 949 } 950 951 static netdev_features_t macvlan_fix_features(struct net_device *dev, 952 netdev_features_t features) 953 { 954 struct macvlan_dev *vlan = netdev_priv(dev); 955 netdev_features_t lowerdev_features = vlan->lowerdev->features; 956 netdev_features_t mask; 957 958 features |= NETIF_F_ALL_FOR_ALL; 959 features &= (vlan->set_features | ~MACVLAN_FEATURES); 960 mask = features; 961 962 lowerdev_features &= (features | ~NETIF_F_LRO); 963 features = netdev_increment_features(lowerdev_features, features, mask); 964 features |= ALWAYS_ON_FEATURES; 965 features &= ~NETIF_F_NETNS_LOCAL; 966 967 return features; 968 } 969 970 #ifdef CONFIG_NET_POLL_CONTROLLER 971 static void macvlan_dev_poll_controller(struct net_device *dev) 972 { 973 return; 974 } 975 976 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 977 { 978 struct macvlan_dev *vlan = netdev_priv(dev); 979 struct net_device *real_dev = vlan->lowerdev; 980 struct netpoll *netpoll; 981 int err = 0; 982 983 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 984 err = -ENOMEM; 985 if (!netpoll) 986 goto out; 987 988 err = __netpoll_setup(netpoll, real_dev); 989 if (err) { 990 kfree(netpoll); 991 goto out; 992 } 993 994 vlan->netpoll = netpoll; 995 996 out: 997 return err; 998 } 999 1000 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1001 { 1002 struct macvlan_dev *vlan = netdev_priv(dev); 1003 struct netpoll *netpoll = vlan->netpoll; 1004 1005 if (!netpoll) 1006 return; 1007 1008 vlan->netpoll = NULL; 1009 1010 __netpoll_free_async(netpoll); 1011 } 1012 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1013 1014 static int macvlan_dev_get_iflink(const struct net_device *dev) 1015 { 1016 struct macvlan_dev *vlan = netdev_priv(dev); 1017 1018 return vlan->lowerdev->ifindex; 1019 } 1020 1021 static const struct ethtool_ops macvlan_ethtool_ops = { 1022 .get_link = ethtool_op_get_link, 1023 .get_settings = macvlan_ethtool_get_settings, 1024 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1025 }; 1026 1027 static const struct net_device_ops macvlan_netdev_ops = { 1028 .ndo_init = macvlan_init, 1029 .ndo_uninit = macvlan_uninit, 1030 .ndo_open = macvlan_open, 1031 .ndo_stop = macvlan_stop, 1032 .ndo_start_xmit = macvlan_start_xmit, 1033 .ndo_change_mtu = macvlan_change_mtu, 1034 .ndo_fix_features = macvlan_fix_features, 1035 .ndo_change_rx_flags = macvlan_change_rx_flags, 1036 .ndo_set_mac_address = macvlan_set_mac_address, 1037 .ndo_set_rx_mode = macvlan_set_mac_lists, 1038 .ndo_get_stats64 = macvlan_dev_get_stats64, 1039 .ndo_validate_addr = eth_validate_addr, 1040 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1041 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1042 .ndo_fdb_add = macvlan_fdb_add, 1043 .ndo_fdb_del = macvlan_fdb_del, 1044 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1045 .ndo_get_lock_subclass = macvlan_get_nest_level, 1046 #ifdef CONFIG_NET_POLL_CONTROLLER 1047 .ndo_poll_controller = macvlan_dev_poll_controller, 1048 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1049 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1050 #endif 1051 .ndo_get_iflink = macvlan_dev_get_iflink, 1052 .ndo_features_check = passthru_features_check, 1053 }; 1054 1055 void macvlan_common_setup(struct net_device *dev) 1056 { 1057 ether_setup(dev); 1058 1059 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1060 netif_keep_dst(dev); 1061 dev->priv_flags |= IFF_UNICAST_FLT; 1062 dev->netdev_ops = &macvlan_netdev_ops; 1063 dev->destructor = free_netdev; 1064 dev->header_ops = &macvlan_hard_header_ops; 1065 dev->ethtool_ops = &macvlan_ethtool_ops; 1066 } 1067 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1068 1069 static void macvlan_setup(struct net_device *dev) 1070 { 1071 macvlan_common_setup(dev); 1072 dev->tx_queue_len = 0; 1073 } 1074 1075 static int macvlan_port_create(struct net_device *dev) 1076 { 1077 struct macvlan_port *port; 1078 unsigned int i; 1079 int err; 1080 1081 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1082 return -EINVAL; 1083 1084 if (netif_is_ipvlan_port(dev)) 1085 return -EBUSY; 1086 1087 port = kzalloc(sizeof(*port), GFP_KERNEL); 1088 if (port == NULL) 1089 return -ENOMEM; 1090 1091 port->passthru = false; 1092 port->dev = dev; 1093 INIT_LIST_HEAD(&port->vlans); 1094 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1095 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1096 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1097 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1098 1099 skb_queue_head_init(&port->bc_queue); 1100 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1101 1102 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1103 if (err) 1104 kfree(port); 1105 else 1106 dev->priv_flags |= IFF_MACVLAN_PORT; 1107 return err; 1108 } 1109 1110 static void macvlan_port_destroy(struct net_device *dev) 1111 { 1112 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1113 1114 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1115 netdev_rx_handler_unregister(dev); 1116 1117 /* After this point, no packet can schedule bc_work anymore, 1118 * but we need to cancel it and purge left skbs if any. 1119 */ 1120 cancel_work_sync(&port->bc_work); 1121 __skb_queue_purge(&port->bc_queue); 1122 1123 kfree_rcu(port, rcu); 1124 } 1125 1126 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 1127 { 1128 if (tb[IFLA_ADDRESS]) { 1129 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1130 return -EINVAL; 1131 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1132 return -EADDRNOTAVAIL; 1133 } 1134 1135 if (data && data[IFLA_MACVLAN_FLAGS] && 1136 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1137 return -EINVAL; 1138 1139 if (data && data[IFLA_MACVLAN_MODE]) { 1140 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1141 case MACVLAN_MODE_PRIVATE: 1142 case MACVLAN_MODE_VEPA: 1143 case MACVLAN_MODE_BRIDGE: 1144 case MACVLAN_MODE_PASSTHRU: 1145 case MACVLAN_MODE_SOURCE: 1146 break; 1147 default: 1148 return -EINVAL; 1149 } 1150 } 1151 1152 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1153 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1154 case MACVLAN_MACADDR_ADD: 1155 case MACVLAN_MACADDR_DEL: 1156 case MACVLAN_MACADDR_FLUSH: 1157 case MACVLAN_MACADDR_SET: 1158 break; 1159 default: 1160 return -EINVAL; 1161 } 1162 } 1163 1164 if (data && data[IFLA_MACVLAN_MACADDR]) { 1165 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1166 return -EINVAL; 1167 1168 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1169 return -EADDRNOTAVAIL; 1170 } 1171 1172 if (data && data[IFLA_MACVLAN_MACADDR_COUNT]) 1173 return -EINVAL; 1174 1175 return 0; 1176 } 1177 1178 /** 1179 * reconfigure list of remote source mac address 1180 * (only for macvlan devices in source mode) 1181 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1182 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1183 */ 1184 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1185 struct nlattr *data[]) 1186 { 1187 char *addr = NULL; 1188 int ret, rem, len; 1189 struct nlattr *nla, *head; 1190 struct macvlan_source_entry *entry; 1191 1192 if (data[IFLA_MACVLAN_MACADDR]) 1193 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1194 1195 if (mode == MACVLAN_MACADDR_ADD) { 1196 if (!addr) 1197 return -EINVAL; 1198 1199 return macvlan_hash_add_source(vlan, addr); 1200 1201 } else if (mode == MACVLAN_MACADDR_DEL) { 1202 if (!addr) 1203 return -EINVAL; 1204 1205 entry = macvlan_hash_lookup_source(vlan, addr); 1206 if (entry) { 1207 macvlan_hash_del_source(entry); 1208 vlan->macaddr_count--; 1209 } 1210 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1211 macvlan_flush_sources(vlan->port, vlan); 1212 } else if (mode == MACVLAN_MACADDR_SET) { 1213 macvlan_flush_sources(vlan->port, vlan); 1214 1215 if (addr) { 1216 ret = macvlan_hash_add_source(vlan, addr); 1217 if (ret) 1218 return ret; 1219 } 1220 1221 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1222 return 0; 1223 1224 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1225 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1226 1227 nla_for_each_attr(nla, head, len, rem) { 1228 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1229 nla_len(nla) != ETH_ALEN) 1230 continue; 1231 1232 addr = nla_data(nla); 1233 ret = macvlan_hash_add_source(vlan, addr); 1234 if (ret) 1235 return ret; 1236 } 1237 } else { 1238 return -EINVAL; 1239 } 1240 1241 return 0; 1242 } 1243 1244 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1245 struct nlattr *tb[], struct nlattr *data[]) 1246 { 1247 struct macvlan_dev *vlan = netdev_priv(dev); 1248 struct macvlan_port *port; 1249 struct net_device *lowerdev; 1250 int err; 1251 int macmode; 1252 1253 if (!tb[IFLA_LINK]) 1254 return -EINVAL; 1255 1256 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1257 if (lowerdev == NULL) 1258 return -ENODEV; 1259 1260 /* When creating macvlans or macvtaps on top of other macvlans - use 1261 * the real device as the lowerdev. 1262 */ 1263 if (netif_is_macvlan(lowerdev)) 1264 lowerdev = macvlan_dev_real_dev(lowerdev); 1265 1266 if (!tb[IFLA_MTU]) 1267 dev->mtu = lowerdev->mtu; 1268 else if (dev->mtu > lowerdev->mtu) 1269 return -EINVAL; 1270 1271 if (!tb[IFLA_ADDRESS]) 1272 eth_hw_addr_random(dev); 1273 1274 if (!macvlan_port_exists(lowerdev)) { 1275 err = macvlan_port_create(lowerdev); 1276 if (err < 0) 1277 return err; 1278 } 1279 port = macvlan_port_get_rtnl(lowerdev); 1280 1281 /* Only 1 macvlan device can be created in passthru mode */ 1282 if (port->passthru) 1283 return -EINVAL; 1284 1285 vlan->lowerdev = lowerdev; 1286 vlan->dev = dev; 1287 vlan->port = port; 1288 vlan->set_features = MACVLAN_FEATURES; 1289 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1; 1290 1291 vlan->mode = MACVLAN_MODE_VEPA; 1292 if (data && data[IFLA_MACVLAN_MODE]) 1293 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1294 1295 if (data && data[IFLA_MACVLAN_FLAGS]) 1296 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1297 1298 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1299 if (port->count) 1300 return -EINVAL; 1301 port->passthru = true; 1302 eth_hw_addr_inherit(dev, lowerdev); 1303 } 1304 1305 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1306 if (vlan->mode != MACVLAN_MODE_SOURCE) 1307 return -EINVAL; 1308 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1309 err = macvlan_changelink_sources(vlan, macmode, data); 1310 if (err) 1311 return err; 1312 } 1313 1314 port->count += 1; 1315 err = register_netdevice(dev); 1316 if (err < 0) 1317 goto destroy_port; 1318 1319 dev->priv_flags |= IFF_MACVLAN; 1320 err = netdev_upper_dev_link(lowerdev, dev); 1321 if (err) 1322 goto unregister_netdev; 1323 1324 list_add_tail_rcu(&vlan->list, &port->vlans); 1325 netif_stacked_transfer_operstate(lowerdev, dev); 1326 linkwatch_fire_event(dev); 1327 1328 return 0; 1329 1330 unregister_netdev: 1331 unregister_netdevice(dev); 1332 destroy_port: 1333 port->count -= 1; 1334 if (!port->count) 1335 macvlan_port_destroy(lowerdev); 1336 1337 return err; 1338 } 1339 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1340 1341 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1342 struct nlattr *tb[], struct nlattr *data[]) 1343 { 1344 return macvlan_common_newlink(src_net, dev, tb, data); 1345 } 1346 1347 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1348 { 1349 struct macvlan_dev *vlan = netdev_priv(dev); 1350 1351 if (vlan->mode == MACVLAN_MODE_SOURCE) 1352 macvlan_flush_sources(vlan->port, vlan); 1353 list_del_rcu(&vlan->list); 1354 unregister_netdevice_queue(dev, head); 1355 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1356 } 1357 EXPORT_SYMBOL_GPL(macvlan_dellink); 1358 1359 static int macvlan_changelink(struct net_device *dev, 1360 struct nlattr *tb[], struct nlattr *data[]) 1361 { 1362 struct macvlan_dev *vlan = netdev_priv(dev); 1363 enum macvlan_mode mode; 1364 bool set_mode = false; 1365 enum macvlan_macaddr_mode macmode; 1366 int ret; 1367 1368 /* Validate mode, but don't set yet: setting flags may fail. */ 1369 if (data && data[IFLA_MACVLAN_MODE]) { 1370 set_mode = true; 1371 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1372 /* Passthrough mode can't be set or cleared dynamically */ 1373 if ((mode == MACVLAN_MODE_PASSTHRU) != 1374 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1375 return -EINVAL; 1376 if (vlan->mode == MACVLAN_MODE_SOURCE && 1377 vlan->mode != mode) 1378 macvlan_flush_sources(vlan->port, vlan); 1379 } 1380 1381 if (data && data[IFLA_MACVLAN_FLAGS]) { 1382 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1383 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1384 if (vlan->port->passthru && promisc) { 1385 int err; 1386 1387 if (flags & MACVLAN_FLAG_NOPROMISC) 1388 err = dev_set_promiscuity(vlan->lowerdev, -1); 1389 else 1390 err = dev_set_promiscuity(vlan->lowerdev, 1); 1391 if (err < 0) 1392 return err; 1393 } 1394 vlan->flags = flags; 1395 } 1396 if (set_mode) 1397 vlan->mode = mode; 1398 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1399 if (vlan->mode != MACVLAN_MODE_SOURCE) 1400 return -EINVAL; 1401 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1402 ret = macvlan_changelink_sources(vlan, macmode, data); 1403 if (ret) 1404 return ret; 1405 } 1406 return 0; 1407 } 1408 1409 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1410 { 1411 if (vlan->macaddr_count == 0) 1412 return 0; 1413 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1414 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1415 } 1416 1417 static size_t macvlan_get_size(const struct net_device *dev) 1418 { 1419 struct macvlan_dev *vlan = netdev_priv(dev); 1420 1421 return (0 1422 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1423 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1424 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1425 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1426 ); 1427 } 1428 1429 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1430 const struct macvlan_dev *vlan, 1431 const int i) 1432 { 1433 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1434 struct macvlan_source_entry *entry; 1435 1436 hlist_for_each_entry_rcu(entry, h, hlist) { 1437 if (entry->vlan != vlan) 1438 continue; 1439 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1440 return 1; 1441 } 1442 return 0; 1443 } 1444 1445 static int macvlan_fill_info(struct sk_buff *skb, 1446 const struct net_device *dev) 1447 { 1448 struct macvlan_dev *vlan = netdev_priv(dev); 1449 int i; 1450 struct nlattr *nest; 1451 1452 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1453 goto nla_put_failure; 1454 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1455 goto nla_put_failure; 1456 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1457 goto nla_put_failure; 1458 if (vlan->macaddr_count > 0) { 1459 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1460 if (nest == NULL) 1461 goto nla_put_failure; 1462 1463 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1464 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1465 goto nla_put_failure; 1466 } 1467 nla_nest_end(skb, nest); 1468 } 1469 return 0; 1470 1471 nla_put_failure: 1472 return -EMSGSIZE; 1473 } 1474 1475 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1476 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1477 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1478 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1479 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1480 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1481 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1482 }; 1483 1484 int macvlan_link_register(struct rtnl_link_ops *ops) 1485 { 1486 /* common fields */ 1487 ops->priv_size = sizeof(struct macvlan_dev); 1488 ops->validate = macvlan_validate; 1489 ops->maxtype = IFLA_MACVLAN_MAX; 1490 ops->policy = macvlan_policy; 1491 ops->changelink = macvlan_changelink; 1492 ops->get_size = macvlan_get_size; 1493 ops->fill_info = macvlan_fill_info; 1494 1495 return rtnl_link_register(ops); 1496 }; 1497 EXPORT_SYMBOL_GPL(macvlan_link_register); 1498 1499 static struct net *macvlan_get_link_net(const struct net_device *dev) 1500 { 1501 return dev_net(macvlan_dev_real_dev(dev)); 1502 } 1503 1504 static struct rtnl_link_ops macvlan_link_ops = { 1505 .kind = "macvlan", 1506 .setup = macvlan_setup, 1507 .newlink = macvlan_newlink, 1508 .dellink = macvlan_dellink, 1509 .get_link_net = macvlan_get_link_net, 1510 }; 1511 1512 static int macvlan_device_event(struct notifier_block *unused, 1513 unsigned long event, void *ptr) 1514 { 1515 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1516 struct macvlan_dev *vlan, *next; 1517 struct macvlan_port *port; 1518 LIST_HEAD(list_kill); 1519 1520 if (!macvlan_port_exists(dev)) 1521 return NOTIFY_DONE; 1522 1523 port = macvlan_port_get_rtnl(dev); 1524 1525 switch (event) { 1526 case NETDEV_UP: 1527 case NETDEV_CHANGE: 1528 list_for_each_entry(vlan, &port->vlans, list) 1529 netif_stacked_transfer_operstate(vlan->lowerdev, 1530 vlan->dev); 1531 break; 1532 case NETDEV_FEAT_CHANGE: 1533 list_for_each_entry(vlan, &port->vlans, list) { 1534 vlan->dev->gso_max_size = dev->gso_max_size; 1535 netdev_update_features(vlan->dev); 1536 } 1537 break; 1538 case NETDEV_CHANGEMTU: 1539 list_for_each_entry(vlan, &port->vlans, list) { 1540 if (vlan->dev->mtu <= dev->mtu) 1541 continue; 1542 dev_set_mtu(vlan->dev, dev->mtu); 1543 } 1544 break; 1545 case NETDEV_CHANGEADDR: 1546 if (!port->passthru) 1547 return NOTIFY_DONE; 1548 1549 vlan = list_first_entry_or_null(&port->vlans, 1550 struct macvlan_dev, 1551 list); 1552 1553 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1554 return NOTIFY_BAD; 1555 1556 break; 1557 case NETDEV_UNREGISTER: 1558 /* twiddle thumbs on netns device moves */ 1559 if (dev->reg_state != NETREG_UNREGISTERING) 1560 break; 1561 1562 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1563 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1564 unregister_netdevice_many(&list_kill); 1565 break; 1566 case NETDEV_PRE_TYPE_CHANGE: 1567 /* Forbid underlaying device to change its type. */ 1568 return NOTIFY_BAD; 1569 1570 case NETDEV_NOTIFY_PEERS: 1571 case NETDEV_BONDING_FAILOVER: 1572 case NETDEV_RESEND_IGMP: 1573 /* Propagate to all vlans */ 1574 list_for_each_entry(vlan, &port->vlans, list) 1575 call_netdevice_notifiers(event, vlan->dev); 1576 } 1577 return NOTIFY_DONE; 1578 } 1579 1580 static struct notifier_block macvlan_notifier_block __read_mostly = { 1581 .notifier_call = macvlan_device_event, 1582 }; 1583 1584 static int __init macvlan_init_module(void) 1585 { 1586 int err; 1587 1588 register_netdevice_notifier(&macvlan_notifier_block); 1589 1590 err = macvlan_link_register(&macvlan_link_ops); 1591 if (err < 0) 1592 goto err1; 1593 return 0; 1594 err1: 1595 unregister_netdevice_notifier(&macvlan_notifier_block); 1596 return err; 1597 } 1598 1599 static void __exit macvlan_cleanup_module(void) 1600 { 1601 rtnl_link_unregister(&macvlan_link_ops); 1602 unregister_netdevice_notifier(&macvlan_notifier_block); 1603 } 1604 1605 module_init(macvlan_init_module); 1606 module_exit(macvlan_cleanup_module); 1607 1608 MODULE_LICENSE("GPL"); 1609 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1610 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1611 MODULE_ALIAS_RTNL_LINK("macvlan"); 1612