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 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ); 53 }; 54 55 struct macvlan_source_entry { 56 struct hlist_node hlist; 57 struct macvlan_dev *vlan; 58 unsigned char addr[6+2] __aligned(sizeof(u16)); 59 struct rcu_head rcu; 60 }; 61 62 struct macvlan_skb_cb { 63 const struct macvlan_dev *src; 64 }; 65 66 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 67 68 static void macvlan_port_destroy(struct net_device *dev); 69 70 /* Hash Ethernet address */ 71 static u32 macvlan_eth_hash(const unsigned char *addr) 72 { 73 u64 value = get_unaligned((u64 *)addr); 74 75 /* only want 6 bytes */ 76 #ifdef __BIG_ENDIAN 77 value >>= 16; 78 #else 79 value <<= 16; 80 #endif 81 return hash_64(value, MACVLAN_HASH_BITS); 82 } 83 84 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 85 { 86 return rcu_dereference(dev->rx_handler_data); 87 } 88 89 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 90 { 91 return rtnl_dereference(dev->rx_handler_data); 92 } 93 94 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 95 96 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 97 const unsigned char *addr) 98 { 99 struct macvlan_dev *vlan; 100 u32 idx = macvlan_eth_hash(addr); 101 102 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) { 103 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 104 return vlan; 105 } 106 return NULL; 107 } 108 109 static struct macvlan_source_entry *macvlan_hash_lookup_source( 110 const struct macvlan_dev *vlan, 111 const unsigned char *addr) 112 { 113 struct macvlan_source_entry *entry; 114 u32 idx = macvlan_eth_hash(addr); 115 struct hlist_head *h = &vlan->port->vlan_source_hash[idx]; 116 117 hlist_for_each_entry_rcu(entry, h, hlist) { 118 if (ether_addr_equal_64bits(entry->addr, addr) && 119 entry->vlan == vlan) 120 return entry; 121 } 122 return NULL; 123 } 124 125 static int macvlan_hash_add_source(struct macvlan_dev *vlan, 126 const unsigned char *addr) 127 { 128 struct macvlan_port *port = vlan->port; 129 struct macvlan_source_entry *entry; 130 struct hlist_head *h; 131 132 entry = macvlan_hash_lookup_source(vlan, addr); 133 if (entry) 134 return 0; 135 136 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 137 if (!entry) 138 return -ENOMEM; 139 140 ether_addr_copy(entry->addr, addr); 141 entry->vlan = vlan; 142 h = &port->vlan_source_hash[macvlan_eth_hash(addr)]; 143 hlist_add_head_rcu(&entry->hlist, h); 144 vlan->macaddr_count++; 145 146 return 0; 147 } 148 149 static void macvlan_hash_add(struct macvlan_dev *vlan) 150 { 151 struct macvlan_port *port = vlan->port; 152 const unsigned char *addr = vlan->dev->dev_addr; 153 u32 idx = macvlan_eth_hash(addr); 154 155 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]); 156 } 157 158 static void macvlan_hash_del_source(struct macvlan_source_entry *entry) 159 { 160 hlist_del_rcu(&entry->hlist); 161 kfree_rcu(entry, rcu); 162 } 163 164 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 165 { 166 hlist_del_rcu(&vlan->hlist); 167 if (sync) 168 synchronize_rcu(); 169 } 170 171 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 172 const unsigned char *addr) 173 { 174 macvlan_hash_del(vlan, true); 175 /* Now that we are unhashed it is safe to change the device 176 * address without confusing packet delivery. 177 */ 178 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 179 macvlan_hash_add(vlan); 180 } 181 182 static int macvlan_addr_busy(const struct macvlan_port *port, 183 const unsigned char *addr) 184 { 185 /* Test to see if the specified multicast address is 186 * currently in use by the underlying device or 187 * another macvlan. 188 */ 189 if (ether_addr_equal_64bits(port->dev->dev_addr, addr)) 190 return 1; 191 192 if (macvlan_hash_lookup(port, addr)) 193 return 1; 194 195 return 0; 196 } 197 198 199 static int macvlan_broadcast_one(struct sk_buff *skb, 200 const struct macvlan_dev *vlan, 201 const struct ethhdr *eth, bool local) 202 { 203 struct net_device *dev = vlan->dev; 204 205 if (local) 206 return __dev_forward_skb(dev, skb); 207 208 skb->dev = dev; 209 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 210 skb->pkt_type = PACKET_BROADCAST; 211 else 212 skb->pkt_type = PACKET_MULTICAST; 213 214 return 0; 215 } 216 217 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 218 { 219 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 220 } 221 222 223 static unsigned int mc_hash(const struct macvlan_dev *vlan, 224 const unsigned char *addr) 225 { 226 u32 val = __get_unaligned_cpu32(addr + 2); 227 228 val ^= macvlan_hash_mix(vlan); 229 return hash_32(val, MACVLAN_MC_FILTER_BITS); 230 } 231 232 static void macvlan_broadcast(struct sk_buff *skb, 233 const struct macvlan_port *port, 234 struct net_device *src, 235 enum macvlan_mode mode) 236 { 237 const struct ethhdr *eth = eth_hdr(skb); 238 const struct macvlan_dev *vlan; 239 struct sk_buff *nskb; 240 unsigned int i; 241 int err; 242 unsigned int hash; 243 244 if (skb->protocol == htons(ETH_P_PAUSE)) 245 return; 246 247 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 248 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 249 if (vlan->dev == src || !(vlan->mode & mode)) 250 continue; 251 252 hash = mc_hash(vlan, eth->h_dest); 253 if (!test_bit(hash, vlan->mc_filter)) 254 continue; 255 256 err = NET_RX_DROP; 257 nskb = skb_clone(skb, GFP_ATOMIC); 258 if (likely(nskb)) 259 err = macvlan_broadcast_one( 260 nskb, vlan, eth, 261 mode == MACVLAN_MODE_BRIDGE) ?: 262 netif_rx_ni(nskb); 263 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 264 err == NET_RX_SUCCESS, true); 265 } 266 } 267 } 268 269 static void macvlan_process_broadcast(struct work_struct *w) 270 { 271 struct macvlan_port *port = container_of(w, struct macvlan_port, 272 bc_work); 273 struct sk_buff *skb; 274 struct sk_buff_head list; 275 276 __skb_queue_head_init(&list); 277 278 spin_lock_bh(&port->bc_queue.lock); 279 skb_queue_splice_tail_init(&port->bc_queue, &list); 280 spin_unlock_bh(&port->bc_queue.lock); 281 282 while ((skb = __skb_dequeue(&list))) { 283 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 284 285 rcu_read_lock(); 286 287 if (!src) 288 /* frame comes from an external address */ 289 macvlan_broadcast(skb, port, NULL, 290 MACVLAN_MODE_PRIVATE | 291 MACVLAN_MODE_VEPA | 292 MACVLAN_MODE_PASSTHRU| 293 MACVLAN_MODE_BRIDGE); 294 else if (src->mode == MACVLAN_MODE_VEPA) 295 /* flood to everyone except source */ 296 macvlan_broadcast(skb, port, src->dev, 297 MACVLAN_MODE_VEPA | 298 MACVLAN_MODE_BRIDGE); 299 else 300 /* 301 * flood only to VEPA ports, bridge ports 302 * already saw the frame on the way out. 303 */ 304 macvlan_broadcast(skb, port, src->dev, 305 MACVLAN_MODE_VEPA); 306 307 rcu_read_unlock(); 308 309 if (src) 310 dev_put(src->dev); 311 kfree_skb(skb); 312 } 313 } 314 315 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 316 const struct macvlan_dev *src, 317 struct sk_buff *skb) 318 { 319 struct sk_buff *nskb; 320 int err = -ENOMEM; 321 322 nskb = skb_clone(skb, GFP_ATOMIC); 323 if (!nskb) 324 goto err; 325 326 MACVLAN_SKB_CB(nskb)->src = src; 327 328 spin_lock(&port->bc_queue.lock); 329 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) { 330 if (src) 331 dev_hold(src->dev); 332 __skb_queue_tail(&port->bc_queue, nskb); 333 err = 0; 334 } 335 spin_unlock(&port->bc_queue.lock); 336 337 if (err) 338 goto free_nskb; 339 340 schedule_work(&port->bc_work); 341 return; 342 343 free_nskb: 344 kfree_skb(nskb); 345 err: 346 atomic_long_inc(&skb->dev->rx_dropped); 347 } 348 349 static void macvlan_flush_sources(struct macvlan_port *port, 350 struct macvlan_dev *vlan) 351 { 352 int i; 353 354 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 355 struct hlist_node *h, *n; 356 357 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) { 358 struct macvlan_source_entry *entry; 359 360 entry = hlist_entry(h, struct macvlan_source_entry, 361 hlist); 362 if (entry->vlan == vlan) 363 macvlan_hash_del_source(entry); 364 } 365 } 366 vlan->macaddr_count = 0; 367 } 368 369 static void macvlan_forward_source_one(struct sk_buff *skb, 370 struct macvlan_dev *vlan) 371 { 372 struct sk_buff *nskb; 373 struct net_device *dev; 374 int len; 375 int ret; 376 377 dev = vlan->dev; 378 if (unlikely(!(dev->flags & IFF_UP))) 379 return; 380 381 nskb = skb_clone(skb, GFP_ATOMIC); 382 if (!nskb) 383 return; 384 385 len = nskb->len + ETH_HLEN; 386 nskb->dev = dev; 387 nskb->pkt_type = PACKET_HOST; 388 389 ret = netif_rx(nskb); 390 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 391 } 392 393 static void macvlan_forward_source(struct sk_buff *skb, 394 struct macvlan_port *port, 395 const unsigned char *addr) 396 { 397 struct macvlan_source_entry *entry; 398 u32 idx = macvlan_eth_hash(addr); 399 struct hlist_head *h = &port->vlan_source_hash[idx]; 400 401 hlist_for_each_entry_rcu(entry, h, hlist) { 402 if (ether_addr_equal_64bits(entry->addr, addr)) 403 if (entry->vlan->dev->flags & IFF_UP) 404 macvlan_forward_source_one(skb, entry->vlan); 405 } 406 } 407 408 /* called under rcu_read_lock() from netif_receive_skb */ 409 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 410 { 411 struct macvlan_port *port; 412 struct sk_buff *skb = *pskb; 413 const struct ethhdr *eth = eth_hdr(skb); 414 const struct macvlan_dev *vlan; 415 const struct macvlan_dev *src; 416 struct net_device *dev; 417 unsigned int len = 0; 418 int ret; 419 rx_handler_result_t handle_res; 420 421 port = macvlan_port_get_rcu(skb->dev); 422 if (is_multicast_ether_addr(eth->h_dest)) { 423 unsigned int hash; 424 425 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); 426 if (!skb) 427 return RX_HANDLER_CONSUMED; 428 *pskb = skb; 429 eth = eth_hdr(skb); 430 macvlan_forward_source(skb, port, eth->h_source); 431 src = macvlan_hash_lookup(port, eth->h_source); 432 if (src && src->mode != MACVLAN_MODE_VEPA && 433 src->mode != MACVLAN_MODE_BRIDGE) { 434 /* forward to original port. */ 435 vlan = src; 436 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 437 netif_rx(skb); 438 handle_res = RX_HANDLER_CONSUMED; 439 goto out; 440 } 441 442 hash = mc_hash(NULL, eth->h_dest); 443 if (test_bit(hash, port->mc_filter)) 444 macvlan_broadcast_enqueue(port, src, skb); 445 446 return RX_HANDLER_PASS; 447 } 448 449 macvlan_forward_source(skb, port, eth->h_source); 450 if (port->passthru) 451 vlan = list_first_or_null_rcu(&port->vlans, 452 struct macvlan_dev, list); 453 else 454 vlan = macvlan_hash_lookup(port, eth->h_dest); 455 if (vlan == NULL) 456 return RX_HANDLER_PASS; 457 458 dev = vlan->dev; 459 if (unlikely(!(dev->flags & IFF_UP))) { 460 kfree_skb(skb); 461 return RX_HANDLER_CONSUMED; 462 } 463 len = skb->len + ETH_HLEN; 464 skb = skb_share_check(skb, GFP_ATOMIC); 465 if (!skb) { 466 ret = NET_RX_DROP; 467 handle_res = RX_HANDLER_CONSUMED; 468 goto out; 469 } 470 471 *pskb = skb; 472 skb->dev = dev; 473 skb->pkt_type = PACKET_HOST; 474 475 ret = NET_RX_SUCCESS; 476 handle_res = RX_HANDLER_ANOTHER; 477 out: 478 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 479 return handle_res; 480 } 481 482 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 483 { 484 const struct macvlan_dev *vlan = netdev_priv(dev); 485 const struct macvlan_port *port = vlan->port; 486 const struct macvlan_dev *dest; 487 488 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 489 const struct ethhdr *eth = (void *)skb->data; 490 491 /* send to other bridge ports directly */ 492 if (is_multicast_ether_addr(eth->h_dest)) { 493 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 494 goto xmit_world; 495 } 496 497 dest = macvlan_hash_lookup(port, eth->h_dest); 498 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 499 /* send to lowerdev first for its network taps */ 500 dev_forward_skb(vlan->lowerdev, skb); 501 502 return NET_XMIT_SUCCESS; 503 } 504 } 505 506 xmit_world: 507 skb->dev = vlan->lowerdev; 508 return dev_queue_xmit(skb); 509 } 510 511 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 512 { 513 #ifdef CONFIG_NET_POLL_CONTROLLER 514 if (vlan->netpoll) 515 netpoll_send_skb(vlan->netpoll, skb); 516 #else 517 BUG(); 518 #endif 519 return NETDEV_TX_OK; 520 } 521 522 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 523 struct net_device *dev) 524 { 525 unsigned int len = skb->len; 526 int ret; 527 struct macvlan_dev *vlan = netdev_priv(dev); 528 529 if (unlikely(netpoll_tx_running(dev))) 530 return macvlan_netpoll_send_skb(vlan, skb); 531 532 if (vlan->fwd_priv) { 533 skb->dev = vlan->lowerdev; 534 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); 535 } else { 536 ret = macvlan_queue_xmit(skb, dev); 537 } 538 539 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 540 struct vlan_pcpu_stats *pcpu_stats; 541 542 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 543 u64_stats_update_begin(&pcpu_stats->syncp); 544 pcpu_stats->tx_packets++; 545 pcpu_stats->tx_bytes += len; 546 u64_stats_update_end(&pcpu_stats->syncp); 547 } else { 548 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 549 } 550 return ret; 551 } 552 553 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 554 unsigned short type, const void *daddr, 555 const void *saddr, unsigned len) 556 { 557 const struct macvlan_dev *vlan = netdev_priv(dev); 558 struct net_device *lowerdev = vlan->lowerdev; 559 560 return dev_hard_header(skb, lowerdev, type, daddr, 561 saddr ? : dev->dev_addr, len); 562 } 563 564 static const struct header_ops macvlan_hard_header_ops = { 565 .create = macvlan_hard_header, 566 .parse = eth_header_parse, 567 .cache = eth_header_cache, 568 .cache_update = eth_header_cache_update, 569 }; 570 571 static struct rtnl_link_ops macvlan_link_ops; 572 573 static int macvlan_open(struct net_device *dev) 574 { 575 struct macvlan_dev *vlan = netdev_priv(dev); 576 struct net_device *lowerdev = vlan->lowerdev; 577 int err; 578 579 if (vlan->port->passthru) { 580 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 581 err = dev_set_promiscuity(lowerdev, 1); 582 if (err < 0) 583 goto out; 584 } 585 goto hash_add; 586 } 587 588 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && 589 dev->rtnl_link_ops == &macvlan_link_ops) { 590 vlan->fwd_priv = 591 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 592 593 /* If we get a NULL pointer back, or if we get an error 594 * then we should just fall through to the non accelerated path 595 */ 596 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 597 vlan->fwd_priv = NULL; 598 } else 599 return 0; 600 } 601 602 err = -EBUSY; 603 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 604 goto out; 605 606 err = dev_uc_add(lowerdev, dev->dev_addr); 607 if (err < 0) 608 goto out; 609 if (dev->flags & IFF_ALLMULTI) { 610 err = dev_set_allmulti(lowerdev, 1); 611 if (err < 0) 612 goto del_unicast; 613 } 614 615 if (dev->flags & IFF_PROMISC) { 616 err = dev_set_promiscuity(lowerdev, 1); 617 if (err < 0) 618 goto clear_multi; 619 } 620 621 hash_add: 622 macvlan_hash_add(vlan); 623 return 0; 624 625 clear_multi: 626 dev_set_allmulti(lowerdev, -1); 627 del_unicast: 628 dev_uc_del(lowerdev, dev->dev_addr); 629 out: 630 if (vlan->fwd_priv) { 631 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 632 vlan->fwd_priv); 633 vlan->fwd_priv = NULL; 634 } 635 return err; 636 } 637 638 static int macvlan_stop(struct net_device *dev) 639 { 640 struct macvlan_dev *vlan = netdev_priv(dev); 641 struct net_device *lowerdev = vlan->lowerdev; 642 643 if (vlan->fwd_priv) { 644 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 645 vlan->fwd_priv); 646 vlan->fwd_priv = NULL; 647 return 0; 648 } 649 650 dev_uc_unsync(lowerdev, dev); 651 dev_mc_unsync(lowerdev, dev); 652 653 if (vlan->port->passthru) { 654 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 655 dev_set_promiscuity(lowerdev, -1); 656 goto hash_del; 657 } 658 659 if (dev->flags & IFF_ALLMULTI) 660 dev_set_allmulti(lowerdev, -1); 661 662 if (dev->flags & IFF_PROMISC) 663 dev_set_promiscuity(lowerdev, -1); 664 665 dev_uc_del(lowerdev, dev->dev_addr); 666 667 hash_del: 668 macvlan_hash_del(vlan, !dev->dismantle); 669 return 0; 670 } 671 672 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 673 { 674 struct macvlan_dev *vlan = netdev_priv(dev); 675 struct net_device *lowerdev = vlan->lowerdev; 676 int err; 677 678 if (!(dev->flags & IFF_UP)) { 679 /* Just copy in the new address */ 680 ether_addr_copy(dev->dev_addr, addr); 681 } else { 682 /* Rehash and update the device filters */ 683 if (macvlan_addr_busy(vlan->port, addr)) 684 return -EBUSY; 685 686 if (!vlan->port->passthru) { 687 err = dev_uc_add(lowerdev, addr); 688 if (err) 689 return err; 690 691 dev_uc_del(lowerdev, dev->dev_addr); 692 } 693 694 macvlan_hash_change_addr(vlan, addr); 695 } 696 return 0; 697 } 698 699 static int macvlan_set_mac_address(struct net_device *dev, void *p) 700 { 701 struct macvlan_dev *vlan = netdev_priv(dev); 702 struct sockaddr *addr = p; 703 704 if (!is_valid_ether_addr(addr->sa_data)) 705 return -EADDRNOTAVAIL; 706 707 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 708 dev_set_mac_address(vlan->lowerdev, addr); 709 return 0; 710 } 711 712 return macvlan_sync_address(dev, addr->sa_data); 713 } 714 715 static void macvlan_change_rx_flags(struct net_device *dev, int change) 716 { 717 struct macvlan_dev *vlan = netdev_priv(dev); 718 struct net_device *lowerdev = vlan->lowerdev; 719 720 if (dev->flags & IFF_UP) { 721 if (change & IFF_ALLMULTI) 722 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 723 if (change & IFF_PROMISC) 724 dev_set_promiscuity(lowerdev, 725 dev->flags & IFF_PROMISC ? 1 : -1); 726 727 } 728 } 729 730 static void macvlan_compute_filter(unsigned long *mc_filter, 731 struct net_device *dev, 732 struct macvlan_dev *vlan) 733 { 734 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 735 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 736 } else { 737 struct netdev_hw_addr *ha; 738 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 739 740 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 741 netdev_for_each_mc_addr(ha, dev) { 742 __set_bit(mc_hash(vlan, ha->addr), filter); 743 } 744 745 __set_bit(mc_hash(vlan, dev->broadcast), filter); 746 747 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 748 } 749 } 750 751 static void macvlan_set_mac_lists(struct net_device *dev) 752 { 753 struct macvlan_dev *vlan = netdev_priv(dev); 754 755 macvlan_compute_filter(vlan->mc_filter, dev, vlan); 756 757 dev_uc_sync(vlan->lowerdev, dev); 758 dev_mc_sync(vlan->lowerdev, dev); 759 760 /* This is slightly inaccurate as we're including the subscription 761 * list of vlan->lowerdev too. 762 * 763 * Bug alert: This only works if everyone has the same broadcast 764 * address as lowerdev. As soon as someone changes theirs this 765 * will break. 766 * 767 * However, this is already broken as when you change your broadcast 768 * address we don't get called. 769 * 770 * The solution is to maintain a list of broadcast addresses like 771 * we do for uc/mc, if you care. 772 */ 773 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); 774 } 775 776 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 777 { 778 struct macvlan_dev *vlan = netdev_priv(dev); 779 780 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 781 return -EINVAL; 782 dev->mtu = new_mtu; 783 return 0; 784 } 785 786 /* 787 * macvlan network devices have devices nesting below it and are a special 788 * "super class" of normal network devices; split their locks off into a 789 * separate class since they always nest. 790 */ 791 static struct lock_class_key macvlan_netdev_addr_lock_key; 792 793 #define ALWAYS_ON_FEATURES \ 794 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \ 795 NETIF_F_GSO_ROBUST) 796 797 #define MACVLAN_FEATURES \ 798 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 799 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \ 800 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 801 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 802 803 #define MACVLAN_STATE_MASK \ 804 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 805 806 static int macvlan_get_nest_level(struct net_device *dev) 807 { 808 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 809 } 810 811 static void macvlan_set_lockdep_class(struct net_device *dev) 812 { 813 netdev_lockdep_set_classes(dev); 814 lockdep_set_class_and_subclass(&dev->addr_list_lock, 815 &macvlan_netdev_addr_lock_key, 816 macvlan_get_nest_level(dev)); 817 } 818 819 static int macvlan_init(struct net_device *dev) 820 { 821 struct macvlan_dev *vlan = netdev_priv(dev); 822 const struct net_device *lowerdev = vlan->lowerdev; 823 struct macvlan_port *port = vlan->port; 824 825 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 826 (lowerdev->state & MACVLAN_STATE_MASK); 827 dev->features = lowerdev->features & MACVLAN_FEATURES; 828 dev->features |= ALWAYS_ON_FEATURES; 829 dev->hw_features |= NETIF_F_LRO; 830 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 831 dev->gso_max_size = lowerdev->gso_max_size; 832 dev->gso_max_segs = lowerdev->gso_max_segs; 833 dev->hard_header_len = lowerdev->hard_header_len; 834 835 macvlan_set_lockdep_class(dev); 836 837 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 838 if (!vlan->pcpu_stats) 839 return -ENOMEM; 840 841 port->count += 1; 842 843 return 0; 844 } 845 846 static void macvlan_uninit(struct net_device *dev) 847 { 848 struct macvlan_dev *vlan = netdev_priv(dev); 849 struct macvlan_port *port = vlan->port; 850 851 free_percpu(vlan->pcpu_stats); 852 853 macvlan_flush_sources(port, vlan); 854 port->count -= 1; 855 if (!port->count) 856 macvlan_port_destroy(port->dev); 857 } 858 859 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 860 struct rtnl_link_stats64 *stats) 861 { 862 struct macvlan_dev *vlan = netdev_priv(dev); 863 864 if (vlan->pcpu_stats) { 865 struct vlan_pcpu_stats *p; 866 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 867 u32 rx_errors = 0, tx_dropped = 0; 868 unsigned int start; 869 int i; 870 871 for_each_possible_cpu(i) { 872 p = per_cpu_ptr(vlan->pcpu_stats, i); 873 do { 874 start = u64_stats_fetch_begin_irq(&p->syncp); 875 rx_packets = p->rx_packets; 876 rx_bytes = p->rx_bytes; 877 rx_multicast = p->rx_multicast; 878 tx_packets = p->tx_packets; 879 tx_bytes = p->tx_bytes; 880 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 881 882 stats->rx_packets += rx_packets; 883 stats->rx_bytes += rx_bytes; 884 stats->multicast += rx_multicast; 885 stats->tx_packets += tx_packets; 886 stats->tx_bytes += tx_bytes; 887 /* rx_errors & tx_dropped are u32, updated 888 * without syncp protection. 889 */ 890 rx_errors += p->rx_errors; 891 tx_dropped += p->tx_dropped; 892 } 893 stats->rx_errors = rx_errors; 894 stats->rx_dropped = rx_errors; 895 stats->tx_dropped = tx_dropped; 896 } 897 return stats; 898 } 899 900 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 901 __be16 proto, u16 vid) 902 { 903 struct macvlan_dev *vlan = netdev_priv(dev); 904 struct net_device *lowerdev = vlan->lowerdev; 905 906 return vlan_vid_add(lowerdev, proto, vid); 907 } 908 909 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 910 __be16 proto, u16 vid) 911 { 912 struct macvlan_dev *vlan = netdev_priv(dev); 913 struct net_device *lowerdev = vlan->lowerdev; 914 915 vlan_vid_del(lowerdev, proto, vid); 916 return 0; 917 } 918 919 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 920 struct net_device *dev, 921 const unsigned char *addr, u16 vid, 922 u16 flags) 923 { 924 struct macvlan_dev *vlan = netdev_priv(dev); 925 int err = -EINVAL; 926 927 /* Support unicast filter only on passthru devices. 928 * Multicast filter should be allowed on all devices. 929 */ 930 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 931 return -EOPNOTSUPP; 932 933 if (flags & NLM_F_REPLACE) 934 return -EOPNOTSUPP; 935 936 if (is_unicast_ether_addr(addr)) 937 err = dev_uc_add_excl(dev, addr); 938 else if (is_multicast_ether_addr(addr)) 939 err = dev_mc_add_excl(dev, addr); 940 941 return err; 942 } 943 944 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 945 struct net_device *dev, 946 const unsigned char *addr, u16 vid) 947 { 948 struct macvlan_dev *vlan = netdev_priv(dev); 949 int err = -EINVAL; 950 951 /* Support unicast filter only on passthru devices. 952 * Multicast filter should be allowed on all devices. 953 */ 954 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 955 return -EOPNOTSUPP; 956 957 if (is_unicast_ether_addr(addr)) 958 err = dev_uc_del(dev, addr); 959 else if (is_multicast_ether_addr(addr)) 960 err = dev_mc_del(dev, addr); 961 962 return err; 963 } 964 965 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 966 struct ethtool_drvinfo *drvinfo) 967 { 968 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 969 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 970 } 971 972 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 973 struct ethtool_link_ksettings *cmd) 974 { 975 const struct macvlan_dev *vlan = netdev_priv(dev); 976 977 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 978 } 979 980 static netdev_features_t macvlan_fix_features(struct net_device *dev, 981 netdev_features_t features) 982 { 983 struct macvlan_dev *vlan = netdev_priv(dev); 984 netdev_features_t lowerdev_features = vlan->lowerdev->features; 985 netdev_features_t mask; 986 987 features |= NETIF_F_ALL_FOR_ALL; 988 features &= (vlan->set_features | ~MACVLAN_FEATURES); 989 mask = features; 990 991 lowerdev_features &= (features | ~NETIF_F_LRO); 992 features = netdev_increment_features(lowerdev_features, features, mask); 993 features |= ALWAYS_ON_FEATURES; 994 features &= ~NETIF_F_NETNS_LOCAL; 995 996 return features; 997 } 998 999 #ifdef CONFIG_NET_POLL_CONTROLLER 1000 static void macvlan_dev_poll_controller(struct net_device *dev) 1001 { 1002 return; 1003 } 1004 1005 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 1006 { 1007 struct macvlan_dev *vlan = netdev_priv(dev); 1008 struct net_device *real_dev = vlan->lowerdev; 1009 struct netpoll *netpoll; 1010 int err = 0; 1011 1012 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 1013 err = -ENOMEM; 1014 if (!netpoll) 1015 goto out; 1016 1017 err = __netpoll_setup(netpoll, real_dev); 1018 if (err) { 1019 kfree(netpoll); 1020 goto out; 1021 } 1022 1023 vlan->netpoll = netpoll; 1024 1025 out: 1026 return err; 1027 } 1028 1029 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1030 { 1031 struct macvlan_dev *vlan = netdev_priv(dev); 1032 struct netpoll *netpoll = vlan->netpoll; 1033 1034 if (!netpoll) 1035 return; 1036 1037 vlan->netpoll = NULL; 1038 1039 __netpoll_free_async(netpoll); 1040 } 1041 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1042 1043 static int macvlan_dev_get_iflink(const struct net_device *dev) 1044 { 1045 struct macvlan_dev *vlan = netdev_priv(dev); 1046 1047 return vlan->lowerdev->ifindex; 1048 } 1049 1050 static const struct ethtool_ops macvlan_ethtool_ops = { 1051 .get_link = ethtool_op_get_link, 1052 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1053 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1054 }; 1055 1056 static const struct net_device_ops macvlan_netdev_ops = { 1057 .ndo_init = macvlan_init, 1058 .ndo_uninit = macvlan_uninit, 1059 .ndo_open = macvlan_open, 1060 .ndo_stop = macvlan_stop, 1061 .ndo_start_xmit = macvlan_start_xmit, 1062 .ndo_change_mtu = macvlan_change_mtu, 1063 .ndo_fix_features = macvlan_fix_features, 1064 .ndo_change_rx_flags = macvlan_change_rx_flags, 1065 .ndo_set_mac_address = macvlan_set_mac_address, 1066 .ndo_set_rx_mode = macvlan_set_mac_lists, 1067 .ndo_get_stats64 = macvlan_dev_get_stats64, 1068 .ndo_validate_addr = eth_validate_addr, 1069 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1070 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1071 .ndo_fdb_add = macvlan_fdb_add, 1072 .ndo_fdb_del = macvlan_fdb_del, 1073 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1074 .ndo_get_lock_subclass = macvlan_get_nest_level, 1075 #ifdef CONFIG_NET_POLL_CONTROLLER 1076 .ndo_poll_controller = macvlan_dev_poll_controller, 1077 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1078 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1079 #endif 1080 .ndo_get_iflink = macvlan_dev_get_iflink, 1081 .ndo_features_check = passthru_features_check, 1082 }; 1083 1084 void macvlan_common_setup(struct net_device *dev) 1085 { 1086 ether_setup(dev); 1087 1088 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1089 netif_keep_dst(dev); 1090 dev->priv_flags |= IFF_UNICAST_FLT; 1091 dev->netdev_ops = &macvlan_netdev_ops; 1092 dev->destructor = free_netdev; 1093 dev->header_ops = &macvlan_hard_header_ops; 1094 dev->ethtool_ops = &macvlan_ethtool_ops; 1095 } 1096 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1097 1098 static void macvlan_setup(struct net_device *dev) 1099 { 1100 macvlan_common_setup(dev); 1101 dev->priv_flags |= IFF_NO_QUEUE; 1102 } 1103 1104 static int macvlan_port_create(struct net_device *dev) 1105 { 1106 struct macvlan_port *port; 1107 unsigned int i; 1108 int err; 1109 1110 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1111 return -EINVAL; 1112 1113 if (netif_is_ipvlan_port(dev)) 1114 return -EBUSY; 1115 1116 port = kzalloc(sizeof(*port), GFP_KERNEL); 1117 if (port == NULL) 1118 return -ENOMEM; 1119 1120 port->passthru = false; 1121 port->dev = dev; 1122 INIT_LIST_HEAD(&port->vlans); 1123 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1124 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1125 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1126 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1127 1128 skb_queue_head_init(&port->bc_queue); 1129 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1130 1131 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1132 if (err) 1133 kfree(port); 1134 else 1135 dev->priv_flags |= IFF_MACVLAN_PORT; 1136 return err; 1137 } 1138 1139 static void macvlan_port_destroy(struct net_device *dev) 1140 { 1141 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1142 1143 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1144 netdev_rx_handler_unregister(dev); 1145 1146 /* After this point, no packet can schedule bc_work anymore, 1147 * but we need to cancel it and purge left skbs if any. 1148 */ 1149 cancel_work_sync(&port->bc_work); 1150 __skb_queue_purge(&port->bc_queue); 1151 1152 kfree_rcu(port, rcu); 1153 } 1154 1155 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 1156 { 1157 if (tb[IFLA_ADDRESS]) { 1158 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1159 return -EINVAL; 1160 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1161 return -EADDRNOTAVAIL; 1162 } 1163 1164 if (data && data[IFLA_MACVLAN_FLAGS] && 1165 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1166 return -EINVAL; 1167 1168 if (data && data[IFLA_MACVLAN_MODE]) { 1169 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1170 case MACVLAN_MODE_PRIVATE: 1171 case MACVLAN_MODE_VEPA: 1172 case MACVLAN_MODE_BRIDGE: 1173 case MACVLAN_MODE_PASSTHRU: 1174 case MACVLAN_MODE_SOURCE: 1175 break; 1176 default: 1177 return -EINVAL; 1178 } 1179 } 1180 1181 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1182 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1183 case MACVLAN_MACADDR_ADD: 1184 case MACVLAN_MACADDR_DEL: 1185 case MACVLAN_MACADDR_FLUSH: 1186 case MACVLAN_MACADDR_SET: 1187 break; 1188 default: 1189 return -EINVAL; 1190 } 1191 } 1192 1193 if (data && data[IFLA_MACVLAN_MACADDR]) { 1194 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1195 return -EINVAL; 1196 1197 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1198 return -EADDRNOTAVAIL; 1199 } 1200 1201 if (data && data[IFLA_MACVLAN_MACADDR_COUNT]) 1202 return -EINVAL; 1203 1204 return 0; 1205 } 1206 1207 /** 1208 * reconfigure list of remote source mac address 1209 * (only for macvlan devices in source mode) 1210 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1211 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1212 */ 1213 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1214 struct nlattr *data[]) 1215 { 1216 char *addr = NULL; 1217 int ret, rem, len; 1218 struct nlattr *nla, *head; 1219 struct macvlan_source_entry *entry; 1220 1221 if (data[IFLA_MACVLAN_MACADDR]) 1222 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1223 1224 if (mode == MACVLAN_MACADDR_ADD) { 1225 if (!addr) 1226 return -EINVAL; 1227 1228 return macvlan_hash_add_source(vlan, addr); 1229 1230 } else if (mode == MACVLAN_MACADDR_DEL) { 1231 if (!addr) 1232 return -EINVAL; 1233 1234 entry = macvlan_hash_lookup_source(vlan, addr); 1235 if (entry) { 1236 macvlan_hash_del_source(entry); 1237 vlan->macaddr_count--; 1238 } 1239 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1240 macvlan_flush_sources(vlan->port, vlan); 1241 } else if (mode == MACVLAN_MACADDR_SET) { 1242 macvlan_flush_sources(vlan->port, vlan); 1243 1244 if (addr) { 1245 ret = macvlan_hash_add_source(vlan, addr); 1246 if (ret) 1247 return ret; 1248 } 1249 1250 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1251 return 0; 1252 1253 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1254 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1255 1256 nla_for_each_attr(nla, head, len, rem) { 1257 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1258 nla_len(nla) != ETH_ALEN) 1259 continue; 1260 1261 addr = nla_data(nla); 1262 ret = macvlan_hash_add_source(vlan, addr); 1263 if (ret) 1264 return ret; 1265 } 1266 } else { 1267 return -EINVAL; 1268 } 1269 1270 return 0; 1271 } 1272 1273 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1274 struct nlattr *tb[], struct nlattr *data[]) 1275 { 1276 struct macvlan_dev *vlan = netdev_priv(dev); 1277 struct macvlan_port *port; 1278 struct net_device *lowerdev; 1279 int err; 1280 int macmode; 1281 1282 if (!tb[IFLA_LINK]) 1283 return -EINVAL; 1284 1285 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1286 if (lowerdev == NULL) 1287 return -ENODEV; 1288 1289 /* When creating macvlans or macvtaps on top of other macvlans - use 1290 * the real device as the lowerdev. 1291 */ 1292 if (netif_is_macvlan(lowerdev)) 1293 lowerdev = macvlan_dev_real_dev(lowerdev); 1294 1295 if (!tb[IFLA_MTU]) 1296 dev->mtu = lowerdev->mtu; 1297 else if (dev->mtu > lowerdev->mtu) 1298 return -EINVAL; 1299 1300 if (!tb[IFLA_ADDRESS]) 1301 eth_hw_addr_random(dev); 1302 1303 if (!macvlan_port_exists(lowerdev)) { 1304 err = macvlan_port_create(lowerdev); 1305 if (err < 0) 1306 return err; 1307 } 1308 port = macvlan_port_get_rtnl(lowerdev); 1309 1310 /* Only 1 macvlan device can be created in passthru mode */ 1311 if (port->passthru) 1312 return -EINVAL; 1313 1314 vlan->lowerdev = lowerdev; 1315 vlan->dev = dev; 1316 vlan->port = port; 1317 vlan->set_features = MACVLAN_FEATURES; 1318 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1; 1319 1320 vlan->mode = MACVLAN_MODE_VEPA; 1321 if (data && data[IFLA_MACVLAN_MODE]) 1322 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1323 1324 if (data && data[IFLA_MACVLAN_FLAGS]) 1325 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1326 1327 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1328 if (port->count) 1329 return -EINVAL; 1330 port->passthru = true; 1331 eth_hw_addr_inherit(dev, lowerdev); 1332 } 1333 1334 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1335 if (vlan->mode != MACVLAN_MODE_SOURCE) 1336 return -EINVAL; 1337 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1338 err = macvlan_changelink_sources(vlan, macmode, data); 1339 if (err) 1340 return err; 1341 } 1342 1343 err = register_netdevice(dev); 1344 if (err < 0) 1345 return err; 1346 1347 dev->priv_flags |= IFF_MACVLAN; 1348 err = netdev_upper_dev_link(lowerdev, dev); 1349 if (err) 1350 goto unregister_netdev; 1351 1352 list_add_tail_rcu(&vlan->list, &port->vlans); 1353 netif_stacked_transfer_operstate(lowerdev, dev); 1354 linkwatch_fire_event(dev); 1355 1356 return 0; 1357 1358 unregister_netdev: 1359 unregister_netdevice(dev); 1360 1361 return err; 1362 } 1363 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1364 1365 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1366 struct nlattr *tb[], struct nlattr *data[]) 1367 { 1368 return macvlan_common_newlink(src_net, dev, tb, data); 1369 } 1370 1371 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1372 { 1373 struct macvlan_dev *vlan = netdev_priv(dev); 1374 1375 if (vlan->mode == MACVLAN_MODE_SOURCE) 1376 macvlan_flush_sources(vlan->port, vlan); 1377 list_del_rcu(&vlan->list); 1378 unregister_netdevice_queue(dev, head); 1379 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1380 } 1381 EXPORT_SYMBOL_GPL(macvlan_dellink); 1382 1383 static int macvlan_changelink(struct net_device *dev, 1384 struct nlattr *tb[], struct nlattr *data[]) 1385 { 1386 struct macvlan_dev *vlan = netdev_priv(dev); 1387 enum macvlan_mode mode; 1388 bool set_mode = false; 1389 enum macvlan_macaddr_mode macmode; 1390 int ret; 1391 1392 /* Validate mode, but don't set yet: setting flags may fail. */ 1393 if (data && data[IFLA_MACVLAN_MODE]) { 1394 set_mode = true; 1395 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1396 /* Passthrough mode can't be set or cleared dynamically */ 1397 if ((mode == MACVLAN_MODE_PASSTHRU) != 1398 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1399 return -EINVAL; 1400 if (vlan->mode == MACVLAN_MODE_SOURCE && 1401 vlan->mode != mode) 1402 macvlan_flush_sources(vlan->port, vlan); 1403 } 1404 1405 if (data && data[IFLA_MACVLAN_FLAGS]) { 1406 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1407 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1408 if (vlan->port->passthru && promisc) { 1409 int err; 1410 1411 if (flags & MACVLAN_FLAG_NOPROMISC) 1412 err = dev_set_promiscuity(vlan->lowerdev, -1); 1413 else 1414 err = dev_set_promiscuity(vlan->lowerdev, 1); 1415 if (err < 0) 1416 return err; 1417 } 1418 vlan->flags = flags; 1419 } 1420 if (set_mode) 1421 vlan->mode = mode; 1422 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1423 if (vlan->mode != MACVLAN_MODE_SOURCE) 1424 return -EINVAL; 1425 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1426 ret = macvlan_changelink_sources(vlan, macmode, data); 1427 if (ret) 1428 return ret; 1429 } 1430 return 0; 1431 } 1432 1433 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1434 { 1435 if (vlan->macaddr_count == 0) 1436 return 0; 1437 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1438 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1439 } 1440 1441 static size_t macvlan_get_size(const struct net_device *dev) 1442 { 1443 struct macvlan_dev *vlan = netdev_priv(dev); 1444 1445 return (0 1446 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1447 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1448 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1449 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1450 ); 1451 } 1452 1453 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1454 const struct macvlan_dev *vlan, 1455 const int i) 1456 { 1457 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1458 struct macvlan_source_entry *entry; 1459 1460 hlist_for_each_entry_rcu(entry, h, hlist) { 1461 if (entry->vlan != vlan) 1462 continue; 1463 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1464 return 1; 1465 } 1466 return 0; 1467 } 1468 1469 static int macvlan_fill_info(struct sk_buff *skb, 1470 const struct net_device *dev) 1471 { 1472 struct macvlan_dev *vlan = netdev_priv(dev); 1473 int i; 1474 struct nlattr *nest; 1475 1476 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1477 goto nla_put_failure; 1478 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1479 goto nla_put_failure; 1480 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1481 goto nla_put_failure; 1482 if (vlan->macaddr_count > 0) { 1483 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1484 if (nest == NULL) 1485 goto nla_put_failure; 1486 1487 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1488 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1489 goto nla_put_failure; 1490 } 1491 nla_nest_end(skb, nest); 1492 } 1493 return 0; 1494 1495 nla_put_failure: 1496 return -EMSGSIZE; 1497 } 1498 1499 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1500 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1501 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1502 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1503 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1504 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1505 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1506 }; 1507 1508 int macvlan_link_register(struct rtnl_link_ops *ops) 1509 { 1510 /* common fields */ 1511 ops->priv_size = sizeof(struct macvlan_dev); 1512 ops->validate = macvlan_validate; 1513 ops->maxtype = IFLA_MACVLAN_MAX; 1514 ops->policy = macvlan_policy; 1515 ops->changelink = macvlan_changelink; 1516 ops->get_size = macvlan_get_size; 1517 ops->fill_info = macvlan_fill_info; 1518 1519 return rtnl_link_register(ops); 1520 }; 1521 EXPORT_SYMBOL_GPL(macvlan_link_register); 1522 1523 static struct net *macvlan_get_link_net(const struct net_device *dev) 1524 { 1525 return dev_net(macvlan_dev_real_dev(dev)); 1526 } 1527 1528 static struct rtnl_link_ops macvlan_link_ops = { 1529 .kind = "macvlan", 1530 .setup = macvlan_setup, 1531 .newlink = macvlan_newlink, 1532 .dellink = macvlan_dellink, 1533 .get_link_net = macvlan_get_link_net, 1534 }; 1535 1536 static int macvlan_device_event(struct notifier_block *unused, 1537 unsigned long event, void *ptr) 1538 { 1539 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1540 struct macvlan_dev *vlan, *next; 1541 struct macvlan_port *port; 1542 LIST_HEAD(list_kill); 1543 1544 if (!macvlan_port_exists(dev)) 1545 return NOTIFY_DONE; 1546 1547 port = macvlan_port_get_rtnl(dev); 1548 1549 switch (event) { 1550 case NETDEV_UP: 1551 case NETDEV_CHANGE: 1552 list_for_each_entry(vlan, &port->vlans, list) 1553 netif_stacked_transfer_operstate(vlan->lowerdev, 1554 vlan->dev); 1555 break; 1556 case NETDEV_FEAT_CHANGE: 1557 list_for_each_entry(vlan, &port->vlans, list) { 1558 vlan->dev->gso_max_size = dev->gso_max_size; 1559 vlan->dev->gso_max_segs = dev->gso_max_segs; 1560 netdev_update_features(vlan->dev); 1561 } 1562 break; 1563 case NETDEV_CHANGEMTU: 1564 list_for_each_entry(vlan, &port->vlans, list) { 1565 if (vlan->dev->mtu <= dev->mtu) 1566 continue; 1567 dev_set_mtu(vlan->dev, dev->mtu); 1568 } 1569 break; 1570 case NETDEV_CHANGEADDR: 1571 if (!port->passthru) 1572 return NOTIFY_DONE; 1573 1574 vlan = list_first_entry_or_null(&port->vlans, 1575 struct macvlan_dev, 1576 list); 1577 1578 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1579 return NOTIFY_BAD; 1580 1581 break; 1582 case NETDEV_UNREGISTER: 1583 /* twiddle thumbs on netns device moves */ 1584 if (dev->reg_state != NETREG_UNREGISTERING) 1585 break; 1586 1587 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1588 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1589 unregister_netdevice_many(&list_kill); 1590 break; 1591 case NETDEV_PRE_TYPE_CHANGE: 1592 /* Forbid underlaying device to change its type. */ 1593 return NOTIFY_BAD; 1594 1595 case NETDEV_NOTIFY_PEERS: 1596 case NETDEV_BONDING_FAILOVER: 1597 case NETDEV_RESEND_IGMP: 1598 /* Propagate to all vlans */ 1599 list_for_each_entry(vlan, &port->vlans, list) 1600 call_netdevice_notifiers(event, vlan->dev); 1601 } 1602 return NOTIFY_DONE; 1603 } 1604 1605 static struct notifier_block macvlan_notifier_block __read_mostly = { 1606 .notifier_call = macvlan_device_event, 1607 }; 1608 1609 static int __init macvlan_init_module(void) 1610 { 1611 int err; 1612 1613 register_netdevice_notifier(&macvlan_notifier_block); 1614 1615 err = macvlan_link_register(&macvlan_link_ops); 1616 if (err < 0) 1617 goto err1; 1618 return 0; 1619 err1: 1620 unregister_netdevice_notifier(&macvlan_notifier_block); 1621 return err; 1622 } 1623 1624 static void __exit macvlan_cleanup_module(void) 1625 { 1626 rtnl_link_unregister(&macvlan_link_ops); 1627 unregister_netdevice_notifier(&macvlan_notifier_block); 1628 } 1629 1630 module_init(macvlan_init_module); 1631 module_exit(macvlan_cleanup_module); 1632 1633 MODULE_LICENSE("GPL"); 1634 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1635 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1636 MODULE_ALIAS_RTNL_LINK("macvlan"); 1637