1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> 4 * 5 * The code this is based on carried the following copyright notice: 6 * --- 7 * (C) Copyright 2001-2006 8 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com 9 * Re-worked by Ben Greear <greearb@candelatech.com> 10 * --- 11 */ 12 #include <linux/kernel.h> 13 #include <linux/types.h> 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/errno.h> 17 #include <linux/slab.h> 18 #include <linux/string.h> 19 #include <linux/rculist.h> 20 #include <linux/notifier.h> 21 #include <linux/netdevice.h> 22 #include <linux/etherdevice.h> 23 #include <linux/net_tstamp.h> 24 #include <linux/ethtool.h> 25 #include <linux/if_arp.h> 26 #include <linux/if_vlan.h> 27 #include <linux/if_link.h> 28 #include <linux/if_macvlan.h> 29 #include <linux/hash.h> 30 #include <linux/workqueue.h> 31 #include <net/netdev_lock.h> 32 #include <net/rtnetlink.h> 33 #include <net/xfrm.h> 34 #include <linux/netpoll.h> 35 #include <linux/phy.h> 36 37 #define MACVLAN_HASH_BITS 8 38 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS) 39 #define MACVLAN_DEFAULT_BC_QUEUE_LEN 1000 40 41 #define MACVLAN_F_PASSTHRU 1 42 #define MACVLAN_F_ADDRCHANGE 2 43 44 struct macvlan_port { 45 struct net_device *dev; 46 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 47 struct list_head vlans; 48 struct sk_buff_head bc_queue; 49 struct work_struct bc_work; 50 u32 bc_queue_len_used; 51 int bc_cutoff; 52 u32 flags; 53 int count; 54 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE]; 55 DECLARE_BITMAP(bc_filter, MACVLAN_MC_FILTER_SZ); 56 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ); 57 unsigned char perm_addr[ETH_ALEN]; 58 }; 59 60 struct macvlan_source_entry { 61 struct hlist_node hlist; 62 struct macvlan_dev __rcu *vlan; 63 unsigned char addr[6+2] __aligned(sizeof(u16)); 64 struct rcu_head rcu; 65 }; 66 67 struct macvlan_skb_cb { 68 const struct macvlan_dev *src; 69 }; 70 71 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 72 73 static void macvlan_port_destroy(struct net_device *dev); 74 static void update_port_bc_queue_len(struct macvlan_port *port); 75 76 static inline bool macvlan_passthru(const struct macvlan_port *port) 77 { 78 return port->flags & MACVLAN_F_PASSTHRU; 79 } 80 81 static inline void macvlan_set_passthru(struct macvlan_port *port) 82 { 83 port->flags |= MACVLAN_F_PASSTHRU; 84 } 85 86 static inline bool macvlan_addr_change(const struct macvlan_port *port) 87 { 88 return port->flags & MACVLAN_F_ADDRCHANGE; 89 } 90 91 static inline void macvlan_set_addr_change(struct macvlan_port *port) 92 { 93 port->flags |= MACVLAN_F_ADDRCHANGE; 94 } 95 96 static inline void macvlan_clear_addr_change(struct macvlan_port *port) 97 { 98 port->flags &= ~MACVLAN_F_ADDRCHANGE; 99 } 100 101 /* Hash Ethernet address */ 102 static u32 macvlan_eth_hash(const unsigned char *addr) 103 { 104 u64 value = get_unaligned((u64 *)addr); 105 106 /* only want 6 bytes */ 107 #ifdef __BIG_ENDIAN 108 value >>= 16; 109 #else 110 value <<= 16; 111 #endif 112 return hash_64(value, MACVLAN_HASH_BITS); 113 } 114 115 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 116 { 117 return rcu_dereference(dev->rx_handler_data); 118 } 119 120 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 121 { 122 return rtnl_dereference(dev->rx_handler_data); 123 } 124 125 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 126 const unsigned char *addr) 127 { 128 struct macvlan_dev *vlan; 129 u32 idx = macvlan_eth_hash(addr); 130 131 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist, 132 lockdep_rtnl_is_held()) { 133 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 134 return vlan; 135 } 136 return NULL; 137 } 138 139 static struct macvlan_source_entry *macvlan_hash_lookup_source( 140 const struct macvlan_dev *vlan, 141 const unsigned char *addr) 142 { 143 struct macvlan_source_entry *entry; 144 u32 idx = macvlan_eth_hash(addr); 145 struct hlist_head *h = &vlan->port->vlan_source_hash[idx]; 146 147 hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) { 148 if (ether_addr_equal_64bits(entry->addr, addr) && 149 rcu_access_pointer(entry->vlan) == vlan) 150 return entry; 151 } 152 return NULL; 153 } 154 155 static int macvlan_hash_add_source(struct macvlan_dev *vlan, 156 const unsigned char *addr) 157 { 158 struct macvlan_port *port = vlan->port; 159 struct macvlan_source_entry *entry; 160 struct hlist_head *h; 161 162 entry = macvlan_hash_lookup_source(vlan, addr); 163 if (entry) 164 return 0; 165 166 entry = kmalloc_obj(*entry); 167 if (!entry) 168 return -ENOMEM; 169 170 ether_addr_copy(entry->addr, addr); 171 RCU_INIT_POINTER(entry->vlan, vlan); 172 h = &port->vlan_source_hash[macvlan_eth_hash(addr)]; 173 hlist_add_head_rcu(&entry->hlist, h); 174 vlan->macaddr_count++; 175 176 return 0; 177 } 178 179 static void macvlan_hash_add(struct macvlan_dev *vlan) 180 { 181 struct macvlan_port *port = vlan->port; 182 const unsigned char *addr = vlan->dev->dev_addr; 183 u32 idx = macvlan_eth_hash(addr); 184 185 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]); 186 } 187 188 static void macvlan_hash_del_source(struct macvlan_source_entry *entry) 189 { 190 RCU_INIT_POINTER(entry->vlan, NULL); 191 hlist_del_rcu(&entry->hlist); 192 kfree_rcu(entry, rcu); 193 } 194 195 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 196 { 197 hlist_del_rcu(&vlan->hlist); 198 if (sync) 199 synchronize_rcu(); 200 } 201 202 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 203 const unsigned char *addr) 204 { 205 macvlan_hash_del(vlan, true); 206 /* Now that we are unhashed it is safe to change the device 207 * address without confusing packet delivery. 208 */ 209 eth_hw_addr_set(vlan->dev, addr); 210 macvlan_hash_add(vlan); 211 } 212 213 static bool macvlan_addr_busy(const struct macvlan_port *port, 214 const unsigned char *addr) 215 { 216 /* Test to see if the specified address is 217 * currently in use by the underlying device or 218 * another macvlan. 219 */ 220 if (!macvlan_passthru(port) && !macvlan_addr_change(port) && 221 ether_addr_equal_64bits(port->dev->dev_addr, addr)) 222 return true; 223 224 if (macvlan_hash_lookup(port, addr)) 225 return true; 226 227 return false; 228 } 229 230 231 static int macvlan_broadcast_one(struct sk_buff *skb, 232 const struct macvlan_dev *vlan, 233 const struct ethhdr *eth, bool local) 234 { 235 struct net_device *dev = vlan->dev; 236 237 if (local) 238 return __dev_forward_skb(dev, skb); 239 240 skb->dev = dev; 241 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 242 skb->pkt_type = PACKET_BROADCAST; 243 else 244 skb->pkt_type = PACKET_MULTICAST; 245 246 return 0; 247 } 248 249 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 250 { 251 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 252 } 253 254 255 static unsigned int mc_hash(const struct macvlan_dev *vlan, 256 const unsigned char *addr) 257 { 258 u32 val = get_unaligned((u32 *)(addr + 2)); 259 260 val ^= macvlan_hash_mix(vlan); 261 return hash_32(val, MACVLAN_MC_FILTER_BITS); 262 } 263 264 static void macvlan_broadcast(struct sk_buff *skb, 265 const struct macvlan_port *port, 266 struct net_device *src, 267 enum macvlan_mode mode) 268 { 269 const struct ethhdr *eth = eth_hdr(skb); 270 const struct macvlan_dev *vlan; 271 struct sk_buff *nskb; 272 unsigned int i; 273 int err; 274 unsigned int hash; 275 276 if (skb->protocol == htons(ETH_P_PAUSE)) 277 return; 278 279 hash_for_each_rcu(port->vlan_hash, i, vlan, hlist) { 280 if (vlan->dev == src || !(vlan->mode & mode)) 281 continue; 282 283 hash = mc_hash(vlan, eth->h_dest); 284 if (!test_bit(hash, vlan->mc_filter)) 285 continue; 286 287 err = NET_RX_DROP; 288 nskb = skb_clone(skb, GFP_ATOMIC); 289 if (likely(nskb)) 290 err = macvlan_broadcast_one(nskb, vlan, eth, 291 mode == MACVLAN_MODE_BRIDGE) ?: 292 netif_rx(nskb); 293 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 294 err == NET_RX_SUCCESS, true); 295 } 296 } 297 298 static void macvlan_multicast_rx(const struct macvlan_port *port, 299 const struct macvlan_dev *src, 300 struct sk_buff *skb) 301 { 302 if (!src) 303 /* frame comes from an external address */ 304 macvlan_broadcast(skb, port, NULL, 305 MACVLAN_MODE_PRIVATE | 306 MACVLAN_MODE_VEPA | 307 MACVLAN_MODE_PASSTHRU| 308 MACVLAN_MODE_BRIDGE); 309 else if (src->mode == MACVLAN_MODE_VEPA) 310 /* flood to everyone except source */ 311 macvlan_broadcast(skb, port, src->dev, 312 MACVLAN_MODE_VEPA | 313 MACVLAN_MODE_BRIDGE); 314 else 315 /* 316 * Flood to VEPA and bridge ports. We cannot distinguish 317 * a looped-back locally-originated multicast from one 318 * sent by an external source sharing the same source MAC 319 * (e.g., VRRP virtual MAC), so deliver to bridge ports 320 * as well to ensure correct reception in all cases. 321 */ 322 macvlan_broadcast(skb, port, NULL, 323 MACVLAN_MODE_VEPA | 324 MACVLAN_MODE_BRIDGE); 325 } 326 327 static void macvlan_process_broadcast(struct work_struct *w) 328 { 329 struct macvlan_port *port = container_of(w, struct macvlan_port, 330 bc_work); 331 struct sk_buff *skb; 332 struct sk_buff_head list; 333 334 __skb_queue_head_init(&list); 335 336 spin_lock_bh(&port->bc_queue.lock); 337 skb_queue_splice_tail_init(&port->bc_queue, &list); 338 spin_unlock_bh(&port->bc_queue.lock); 339 340 while ((skb = __skb_dequeue(&list))) { 341 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 342 343 rcu_read_lock(); 344 macvlan_multicast_rx(port, src, skb); 345 rcu_read_unlock(); 346 347 if (src) 348 dev_put(src->dev); 349 consume_skb(skb); 350 351 cond_resched(); 352 } 353 } 354 355 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 356 const struct macvlan_dev *src, 357 struct sk_buff *skb) 358 { 359 struct sk_buff *nskb; 360 int err = -ENOMEM; 361 362 nskb = skb_clone(skb, GFP_ATOMIC); 363 if (!nskb) 364 goto err; 365 366 MACVLAN_SKB_CB(nskb)->src = src; 367 368 spin_lock(&port->bc_queue.lock); 369 if (skb_queue_len(&port->bc_queue) < port->bc_queue_len_used) { 370 if (src) 371 dev_hold(src->dev); 372 __skb_queue_tail(&port->bc_queue, nskb); 373 err = 0; 374 } 375 spin_unlock(&port->bc_queue.lock); 376 377 queue_work(system_dfl_wq, &port->bc_work); 378 379 if (err) 380 goto free_nskb; 381 382 return; 383 384 free_nskb: 385 kfree_skb(nskb); 386 err: 387 dev_core_stats_rx_dropped_inc(skb->dev); 388 } 389 390 static void macvlan_flush_sources(struct macvlan_port *port, 391 struct macvlan_dev *vlan) 392 { 393 struct macvlan_source_entry *entry; 394 struct hlist_node *next; 395 int i; 396 397 hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist) 398 if (rcu_access_pointer(entry->vlan) == vlan) 399 macvlan_hash_del_source(entry); 400 401 vlan->macaddr_count = 0; 402 } 403 404 static void macvlan_forward_source_one(struct sk_buff *skb, 405 struct macvlan_dev *vlan) 406 { 407 struct sk_buff *nskb; 408 struct net_device *dev; 409 int len; 410 int ret; 411 412 dev = vlan->dev; 413 if (unlikely(!(dev->flags & IFF_UP))) 414 return; 415 416 nskb = skb_clone(skb, GFP_ATOMIC); 417 if (!nskb) 418 return; 419 420 len = nskb->len + ETH_HLEN; 421 nskb->dev = dev; 422 423 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr)) 424 nskb->pkt_type = PACKET_HOST; 425 426 ret = __netif_rx(nskb); 427 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 428 } 429 430 static bool macvlan_forward_source(struct sk_buff *skb, 431 struct macvlan_port *port, 432 const unsigned char *addr) 433 { 434 struct macvlan_source_entry *entry; 435 u32 idx = macvlan_eth_hash(addr); 436 struct hlist_head *h = &port->vlan_source_hash[idx]; 437 bool consume = false; 438 439 hlist_for_each_entry_rcu(entry, h, hlist) { 440 if (ether_addr_equal_64bits(entry->addr, addr)) { 441 struct macvlan_dev *vlan = rcu_dereference(entry->vlan); 442 443 if (!vlan) 444 continue; 445 446 if (vlan->flags & MACVLAN_FLAG_NODST) 447 consume = true; 448 macvlan_forward_source_one(skb, vlan); 449 } 450 } 451 452 return consume; 453 } 454 455 /* called under rcu_read_lock() from netif_receive_skb */ 456 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 457 { 458 struct macvlan_port *port; 459 struct sk_buff *skb = *pskb; 460 const struct ethhdr *eth = eth_hdr(skb); 461 const struct macvlan_dev *vlan; 462 const struct macvlan_dev *src; 463 struct net_device *dev; 464 unsigned int len = 0; 465 int ret; 466 rx_handler_result_t handle_res; 467 468 /* Packets from dev_loopback_xmit() do not have L2 header, bail out */ 469 if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) 470 return RX_HANDLER_PASS; 471 472 port = macvlan_port_get_rcu(skb->dev); 473 if (is_multicast_ether_addr(eth->h_dest)) { 474 unsigned int hash; 475 476 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); 477 if (!skb) 478 return RX_HANDLER_CONSUMED; 479 *pskb = skb; 480 eth = eth_hdr(skb); 481 if (macvlan_forward_source(skb, port, eth->h_source)) { 482 kfree_skb(skb); 483 return RX_HANDLER_CONSUMED; 484 } 485 src = macvlan_hash_lookup(port, eth->h_source); 486 if (src && src->mode != MACVLAN_MODE_VEPA && 487 src->mode != MACVLAN_MODE_BRIDGE) { 488 /* forward to original port. */ 489 vlan = src; 490 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 491 __netif_rx(skb); 492 handle_res = RX_HANDLER_CONSUMED; 493 goto out; 494 } 495 496 hash = mc_hash(NULL, eth->h_dest); 497 if (test_bit(hash, port->bc_filter)) 498 macvlan_broadcast_enqueue(port, src, skb); 499 else if (test_bit(hash, port->mc_filter)) 500 macvlan_multicast_rx(port, src, skb); 501 502 return RX_HANDLER_PASS; 503 } 504 505 if (macvlan_forward_source(skb, port, eth->h_source)) { 506 kfree_skb(skb); 507 return RX_HANDLER_CONSUMED; 508 } 509 if (macvlan_passthru(port)) 510 vlan = list_first_or_null_rcu(&port->vlans, 511 struct macvlan_dev, list); 512 else 513 vlan = macvlan_hash_lookup(port, eth->h_dest); 514 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE) 515 return RX_HANDLER_PASS; 516 517 dev = vlan->dev; 518 if (unlikely(!(dev->flags & IFF_UP))) { 519 kfree_skb(skb); 520 return RX_HANDLER_CONSUMED; 521 } 522 len = skb->len + ETH_HLEN; 523 skb = skb_share_check(skb, GFP_ATOMIC); 524 if (!skb) { 525 ret = NET_RX_DROP; 526 handle_res = RX_HANDLER_CONSUMED; 527 goto out; 528 } 529 530 *pskb = skb; 531 skb->dev = dev; 532 skb->pkt_type = PACKET_HOST; 533 534 ret = NET_RX_SUCCESS; 535 handle_res = RX_HANDLER_ANOTHER; 536 out: 537 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 538 return handle_res; 539 } 540 541 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 542 { 543 const struct macvlan_dev *vlan = netdev_priv(dev); 544 const struct macvlan_port *port = vlan->port; 545 const struct macvlan_dev *dest; 546 547 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 548 const struct ethhdr *eth = skb_eth_hdr(skb); 549 550 /* send to other bridge ports directly */ 551 if (is_multicast_ether_addr(eth->h_dest)) { 552 skb_reset_mac_header(skb); 553 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 554 goto xmit_world; 555 } 556 557 dest = macvlan_hash_lookup(port, eth->h_dest); 558 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 559 /* send to lowerdev first for its network taps */ 560 dev_forward_skb(vlan->lowerdev, skb); 561 562 return NET_XMIT_SUCCESS; 563 } 564 } 565 xmit_world: 566 skb->dev = vlan->lowerdev; 567 return dev_queue_xmit_accel(skb, 568 netdev_get_sb_channel(dev) ? dev : NULL); 569 } 570 571 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 572 { 573 #ifdef CONFIG_NET_POLL_CONTROLLER 574 return netpoll_send_skb(vlan->netpoll, skb); 575 #else 576 BUG(); 577 return NETDEV_TX_OK; 578 #endif 579 } 580 581 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 582 struct net_device *dev) 583 { 584 struct macvlan_dev *vlan = netdev_priv(dev); 585 unsigned int len = skb->len; 586 int ret; 587 588 if (unlikely(netpoll_tx_running(dev))) 589 return macvlan_netpoll_send_skb(vlan, skb); 590 591 ret = macvlan_queue_xmit(skb, dev); 592 593 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 594 struct vlan_pcpu_stats *pcpu_stats; 595 596 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 597 u64_stats_update_begin(&pcpu_stats->syncp); 598 u64_stats_inc(&pcpu_stats->tx_packets); 599 u64_stats_add(&pcpu_stats->tx_bytes, len); 600 u64_stats_update_end(&pcpu_stats->syncp); 601 } else { 602 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 603 } 604 return ret; 605 } 606 607 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 608 unsigned short type, const void *daddr, 609 const void *saddr, unsigned len) 610 { 611 const struct macvlan_dev *vlan = netdev_priv(dev); 612 struct net_device *lowerdev = vlan->lowerdev; 613 614 return dev_hard_header(skb, lowerdev, type, daddr, 615 saddr ? : dev->dev_addr, len); 616 } 617 618 static const struct header_ops macvlan_hard_header_ops = { 619 .create = macvlan_hard_header, 620 .parse = eth_header_parse, 621 .cache = eth_header_cache, 622 .cache_update = eth_header_cache_update, 623 .parse_protocol = eth_header_parse_protocol, 624 }; 625 626 static int macvlan_open(struct net_device *dev) 627 { 628 struct macvlan_dev *vlan = netdev_priv(dev); 629 struct net_device *lowerdev = vlan->lowerdev; 630 int err; 631 632 if (macvlan_passthru(vlan->port)) { 633 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 634 err = dev_set_promiscuity(lowerdev, 1); 635 if (err < 0) 636 goto out; 637 } 638 goto hash_add; 639 } 640 641 err = -EADDRINUSE; 642 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 643 goto out; 644 645 /* Attempt to populate accel_priv which is used to offload the L2 646 * forwarding requests for unicast packets. 647 */ 648 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) 649 vlan->accel_priv = 650 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 651 652 /* If earlier attempt to offload failed, or accel_priv is not 653 * populated we must add the unicast address to the lower device. 654 */ 655 if (IS_ERR_OR_NULL(vlan->accel_priv)) { 656 vlan->accel_priv = NULL; 657 err = dev_uc_add(lowerdev, dev->dev_addr); 658 if (err < 0) 659 goto out; 660 } 661 662 if (dev->flags & IFF_ALLMULTI) { 663 err = dev_set_allmulti(lowerdev, 1); 664 if (err < 0) 665 goto del_unicast; 666 } 667 668 if (dev->flags & IFF_PROMISC) { 669 err = dev_set_promiscuity(lowerdev, 1); 670 if (err < 0) 671 goto clear_multi; 672 } 673 674 hash_add: 675 macvlan_hash_add(vlan); 676 return 0; 677 678 clear_multi: 679 if (dev->flags & IFF_ALLMULTI) 680 dev_set_allmulti(lowerdev, -1); 681 del_unicast: 682 if (vlan->accel_priv) { 683 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 684 vlan->accel_priv); 685 vlan->accel_priv = NULL; 686 } else { 687 dev_uc_del(lowerdev, dev->dev_addr); 688 } 689 out: 690 return err; 691 } 692 693 static int macvlan_stop(struct net_device *dev) 694 { 695 struct macvlan_dev *vlan = netdev_priv(dev); 696 struct net_device *lowerdev = vlan->lowerdev; 697 698 if (vlan->accel_priv) { 699 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 700 vlan->accel_priv); 701 vlan->accel_priv = NULL; 702 } 703 704 dev_uc_unsync(lowerdev, dev); 705 dev_mc_unsync(lowerdev, dev); 706 707 if (macvlan_passthru(vlan->port)) { 708 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 709 dev_set_promiscuity(lowerdev, -1); 710 goto hash_del; 711 } 712 713 if (dev->flags & IFF_ALLMULTI) 714 dev_set_allmulti(lowerdev, -1); 715 716 if (dev->flags & IFF_PROMISC) 717 dev_set_promiscuity(lowerdev, -1); 718 719 dev_uc_del(lowerdev, dev->dev_addr); 720 721 hash_del: 722 macvlan_hash_del(vlan, !dev->dismantle); 723 return 0; 724 } 725 726 static int macvlan_sync_address(struct net_device *dev, 727 const unsigned char *addr) 728 { 729 struct macvlan_dev *vlan = netdev_priv(dev); 730 struct net_device *lowerdev = vlan->lowerdev; 731 struct macvlan_port *port = vlan->port; 732 int err; 733 734 if (!(dev->flags & IFF_UP)) { 735 /* Just copy in the new address */ 736 eth_hw_addr_set(dev, addr); 737 } else { 738 /* Rehash and update the device filters */ 739 if (macvlan_addr_busy(vlan->port, addr)) 740 return -EADDRINUSE; 741 742 if (!macvlan_passthru(port)) { 743 err = dev_uc_add(lowerdev, addr); 744 if (err) 745 return err; 746 747 dev_uc_del(lowerdev, dev->dev_addr); 748 } 749 750 macvlan_hash_change_addr(vlan, addr); 751 } 752 if (macvlan_passthru(port) && !macvlan_addr_change(port)) { 753 /* Since addr_change isn't set, we are here due to lower 754 * device change. Save the lower-dev address so we can 755 * restore it later. 756 */ 757 ether_addr_copy(vlan->port->perm_addr, 758 lowerdev->dev_addr); 759 } 760 macvlan_clear_addr_change(port); 761 return 0; 762 } 763 764 static int macvlan_set_mac_address(struct net_device *dev, void *p) 765 { 766 struct macvlan_dev *vlan = netdev_priv(dev); 767 struct sockaddr_storage *addr = p; 768 769 if (!is_valid_ether_addr(addr->__data)) 770 return -EADDRNOTAVAIL; 771 772 /* If the addresses are the same, this is a no-op */ 773 if (ether_addr_equal(dev->dev_addr, addr->__data)) 774 return 0; 775 776 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 777 macvlan_set_addr_change(vlan->port); 778 return dev_set_mac_address(vlan->lowerdev, addr, NULL); 779 } 780 781 if (macvlan_addr_busy(vlan->port, addr->__data)) 782 return -EADDRINUSE; 783 784 return macvlan_sync_address(dev, addr->__data); 785 } 786 787 static void macvlan_change_rx_flags(struct net_device *dev, int change) 788 { 789 struct macvlan_dev *vlan = netdev_priv(dev); 790 struct net_device *lowerdev = vlan->lowerdev; 791 792 if (dev->flags & IFF_UP) { 793 if (change & IFF_ALLMULTI) 794 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 795 if (!macvlan_passthru(vlan->port) && change & IFF_PROMISC) 796 dev_set_promiscuity(lowerdev, 797 dev->flags & IFF_PROMISC ? 1 : -1); 798 799 } 800 } 801 802 static void macvlan_compute_filter(unsigned long *mc_filter, 803 struct net_device *dev, 804 struct macvlan_dev *vlan, int cutoff) 805 { 806 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 807 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 808 } else { 809 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 810 struct netdev_hw_addr *ha; 811 812 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 813 netdev_for_each_mc_addr(ha, dev) { 814 if (!vlan && ha->synced <= cutoff) 815 continue; 816 817 __set_bit(mc_hash(vlan, ha->addr), filter); 818 } 819 820 __set_bit(mc_hash(vlan, dev->broadcast), filter); 821 822 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 823 } 824 } 825 826 static void macvlan_recompute_bc_filter(struct macvlan_dev *vlan) 827 { 828 if (vlan->port->bc_cutoff < 0) { 829 bitmap_zero(vlan->port->bc_filter, MACVLAN_MC_FILTER_SZ); 830 return; 831 } 832 833 macvlan_compute_filter(vlan->port->bc_filter, vlan->lowerdev, NULL, 834 vlan->port->bc_cutoff); 835 } 836 837 static void macvlan_set_mac_lists(struct net_device *dev) 838 { 839 struct macvlan_dev *vlan = netdev_priv(dev); 840 841 macvlan_compute_filter(vlan->mc_filter, dev, vlan, 0); 842 843 dev_uc_sync(vlan->lowerdev, dev); 844 dev_mc_sync(vlan->lowerdev, dev); 845 846 /* This is slightly inaccurate as we're including the subscription 847 * list of vlan->lowerdev too. 848 * 849 * Bug alert: This only works if everyone has the same broadcast 850 * address as lowerdev. As soon as someone changes theirs this 851 * will break. 852 * 853 * However, this is already broken as when you change your broadcast 854 * address we don't get called. 855 * 856 * The solution is to maintain a list of broadcast addresses like 857 * we do for uc/mc, if you care. 858 */ 859 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL, 860 0); 861 macvlan_recompute_bc_filter(vlan); 862 } 863 864 static void update_port_bc_cutoff(struct macvlan_dev *vlan, int cutoff) 865 { 866 if (vlan->port->bc_cutoff == cutoff) 867 return; 868 869 vlan->port->bc_cutoff = cutoff; 870 macvlan_recompute_bc_filter(vlan); 871 } 872 873 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 874 { 875 struct macvlan_dev *vlan = netdev_priv(dev); 876 877 if (vlan->lowerdev->mtu < new_mtu) 878 return -EINVAL; 879 WRITE_ONCE(dev->mtu, new_mtu); 880 return 0; 881 } 882 883 static int macvlan_hwtstamp_get(struct net_device *dev, 884 struct kernel_hwtstamp_config *cfg) 885 { 886 struct net_device *real_dev = macvlan_dev_real_dev(dev); 887 888 return generic_hwtstamp_get_lower(real_dev, cfg); 889 } 890 891 static int macvlan_hwtstamp_set(struct net_device *dev, 892 struct kernel_hwtstamp_config *cfg, 893 struct netlink_ext_ack *extack) 894 { 895 struct net_device *real_dev = macvlan_dev_real_dev(dev); 896 897 if (!net_eq(dev_net(dev), &init_net)) 898 return -EOPNOTSUPP; 899 900 return generic_hwtstamp_set_lower(real_dev, cfg, extack); 901 } 902 903 /* 904 * macvlan network devices have devices nesting below it and are a special 905 * "super class" of normal network devices; split their locks off into a 906 * separate class since they always nest. 907 */ 908 static struct lock_class_key macvlan_netdev_addr_lock_key; 909 910 #define ALWAYS_ON_OFFLOADS \ 911 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ 912 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL) 913 914 #define ALWAYS_ON_FEATURES ALWAYS_ON_OFFLOADS 915 916 #define MACVLAN_FEATURES \ 917 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 918 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \ 919 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 920 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 921 922 #define MACVLAN_STATE_MASK \ 923 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 924 925 static void macvlan_set_lockdep_class(struct net_device *dev) 926 { 927 netdev_lockdep_set_classes(dev); 928 lockdep_set_class(&dev->addr_list_lock, 929 &macvlan_netdev_addr_lock_key); 930 } 931 932 static int macvlan_init(struct net_device *dev) 933 { 934 struct macvlan_dev *vlan = netdev_priv(dev); 935 struct net_device *lowerdev = vlan->lowerdev; 936 struct macvlan_port *port = vlan->port; 937 938 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 939 (lowerdev->state & MACVLAN_STATE_MASK); 940 dev->features = lowerdev->features & MACVLAN_FEATURES; 941 dev->features |= ALWAYS_ON_FEATURES; 942 dev->hw_features |= NETIF_F_LRO; 943 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 944 dev->vlan_features |= ALWAYS_ON_OFFLOADS; 945 dev->hw_enc_features |= dev->features; 946 dev->lltx = true; 947 netif_inherit_tso_max(dev, lowerdev); 948 dev->hard_header_len = lowerdev->hard_header_len; 949 macvlan_set_lockdep_class(dev); 950 951 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 952 if (!vlan->pcpu_stats) 953 return -ENOMEM; 954 955 port->count += 1; 956 957 /* Get macvlan's reference to lowerdev */ 958 netdev_hold(lowerdev, &vlan->dev_tracker, GFP_KERNEL); 959 960 return 0; 961 } 962 963 static void macvlan_uninit(struct net_device *dev) 964 { 965 struct macvlan_dev *vlan = netdev_priv(dev); 966 struct macvlan_port *port = vlan->port; 967 968 free_percpu(vlan->pcpu_stats); 969 970 macvlan_flush_sources(port, vlan); 971 port->count -= 1; 972 if (!port->count) 973 macvlan_port_destroy(port->dev); 974 } 975 976 static void macvlan_dev_get_stats64(struct net_device *dev, 977 struct rtnl_link_stats64 *stats) 978 { 979 struct macvlan_dev *vlan = netdev_priv(dev); 980 981 if (vlan->pcpu_stats) { 982 struct vlan_pcpu_stats *p; 983 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 984 u32 rx_errors = 0, tx_dropped = 0; 985 unsigned int start; 986 int i; 987 988 for_each_possible_cpu(i) { 989 p = per_cpu_ptr(vlan->pcpu_stats, i); 990 do { 991 start = u64_stats_fetch_begin(&p->syncp); 992 rx_packets = u64_stats_read(&p->rx_packets); 993 rx_bytes = u64_stats_read(&p->rx_bytes); 994 rx_multicast = u64_stats_read(&p->rx_multicast); 995 tx_packets = u64_stats_read(&p->tx_packets); 996 tx_bytes = u64_stats_read(&p->tx_bytes); 997 } while (u64_stats_fetch_retry(&p->syncp, start)); 998 999 stats->rx_packets += rx_packets; 1000 stats->rx_bytes += rx_bytes; 1001 stats->multicast += rx_multicast; 1002 stats->tx_packets += tx_packets; 1003 stats->tx_bytes += tx_bytes; 1004 /* rx_errors & tx_dropped are u32, updated 1005 * without syncp protection. 1006 */ 1007 rx_errors += READ_ONCE(p->rx_errors); 1008 tx_dropped += READ_ONCE(p->tx_dropped); 1009 } 1010 stats->rx_errors = rx_errors; 1011 stats->rx_dropped = rx_errors; 1012 stats->tx_dropped = tx_dropped; 1013 } 1014 } 1015 1016 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 1017 __be16 proto, u16 vid) 1018 { 1019 struct macvlan_dev *vlan = netdev_priv(dev); 1020 struct net_device *lowerdev = vlan->lowerdev; 1021 1022 return vlan_vid_add(lowerdev, proto, vid); 1023 } 1024 1025 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 1026 __be16 proto, u16 vid) 1027 { 1028 struct macvlan_dev *vlan = netdev_priv(dev); 1029 struct net_device *lowerdev = vlan->lowerdev; 1030 1031 vlan_vid_del(lowerdev, proto, vid); 1032 return 0; 1033 } 1034 1035 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1036 struct net_device *dev, 1037 const unsigned char *addr, u16 vid, 1038 u16 flags, bool *notified, 1039 struct netlink_ext_ack *extack) 1040 { 1041 struct macvlan_dev *vlan = netdev_priv(dev); 1042 int err = -EINVAL; 1043 1044 /* Support unicast filter only on passthru devices. 1045 * Multicast filter should be allowed on all devices. 1046 */ 1047 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1048 return -EOPNOTSUPP; 1049 1050 if (flags & NLM_F_REPLACE) 1051 return -EOPNOTSUPP; 1052 1053 if (is_unicast_ether_addr(addr)) 1054 err = dev_uc_add_excl(dev, addr); 1055 else if (is_multicast_ether_addr(addr)) 1056 err = dev_mc_add_excl(dev, addr); 1057 1058 return err; 1059 } 1060 1061 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 1062 struct net_device *dev, 1063 const unsigned char *addr, u16 vid, bool *notified, 1064 struct netlink_ext_ack *extack) 1065 { 1066 struct macvlan_dev *vlan = netdev_priv(dev); 1067 int err = -EINVAL; 1068 1069 /* Support unicast filter only on passthru devices. 1070 * Multicast filter should be allowed on all devices. 1071 */ 1072 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1073 return -EOPNOTSUPP; 1074 1075 if (is_unicast_ether_addr(addr)) 1076 err = dev_uc_del(dev, addr); 1077 else if (is_multicast_ether_addr(addr)) 1078 err = dev_mc_del(dev, addr); 1079 1080 return err; 1081 } 1082 1083 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 1084 struct ethtool_drvinfo *drvinfo) 1085 { 1086 strscpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 1087 strscpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 1088 } 1089 1090 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 1091 struct ethtool_link_ksettings *cmd) 1092 { 1093 const struct macvlan_dev *vlan = netdev_priv(dev); 1094 1095 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 1096 } 1097 1098 static int macvlan_ethtool_get_ts_info(struct net_device *dev, 1099 struct kernel_ethtool_ts_info *info) 1100 { 1101 struct net_device *real_dev = macvlan_dev_real_dev(dev); 1102 1103 return ethtool_get_ts_info_by_layer(real_dev, info); 1104 } 1105 1106 static netdev_features_t macvlan_fix_features(struct net_device *dev, 1107 netdev_features_t features) 1108 { 1109 struct macvlan_dev *vlan = netdev_priv(dev); 1110 netdev_features_t lowerdev_features = vlan->lowerdev->features; 1111 netdev_features_t mask; 1112 1113 features |= NETIF_F_ALL_FOR_ALL; 1114 features &= (vlan->set_features | ~MACVLAN_FEATURES); 1115 mask = features; 1116 1117 lowerdev_features &= (features | ~NETIF_F_LRO); 1118 features = netdev_increment_features(lowerdev_features, features, mask); 1119 features |= ALWAYS_ON_FEATURES; 1120 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES); 1121 1122 return features; 1123 } 1124 1125 #ifdef CONFIG_NET_POLL_CONTROLLER 1126 static void macvlan_dev_poll_controller(struct net_device *dev) 1127 { 1128 return; 1129 } 1130 1131 static int macvlan_dev_netpoll_setup(struct net_device *dev) 1132 { 1133 struct macvlan_dev *vlan = netdev_priv(dev); 1134 struct net_device *real_dev = vlan->lowerdev; 1135 struct netpoll *netpoll; 1136 int err; 1137 1138 netpoll = kzalloc_obj(*netpoll); 1139 err = -ENOMEM; 1140 if (!netpoll) 1141 goto out; 1142 1143 err = __netpoll_setup(netpoll, real_dev); 1144 if (err) { 1145 kfree(netpoll); 1146 goto out; 1147 } 1148 1149 vlan->netpoll = netpoll; 1150 1151 out: 1152 return err; 1153 } 1154 1155 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1156 { 1157 struct macvlan_dev *vlan = netdev_priv(dev); 1158 struct netpoll *netpoll = vlan->netpoll; 1159 1160 if (!netpoll) 1161 return; 1162 1163 vlan->netpoll = NULL; 1164 1165 __netpoll_free(netpoll); 1166 } 1167 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1168 1169 static int macvlan_dev_get_iflink(const struct net_device *dev) 1170 { 1171 struct macvlan_dev *vlan = netdev_priv(dev); 1172 1173 return READ_ONCE(vlan->lowerdev->ifindex); 1174 } 1175 1176 static const struct ethtool_ops macvlan_ethtool_ops = { 1177 .get_link = ethtool_op_get_link, 1178 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1179 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1180 .get_ts_info = macvlan_ethtool_get_ts_info, 1181 }; 1182 1183 static const struct net_device_ops macvlan_netdev_ops = { 1184 .ndo_init = macvlan_init, 1185 .ndo_uninit = macvlan_uninit, 1186 .ndo_open = macvlan_open, 1187 .ndo_stop = macvlan_stop, 1188 .ndo_start_xmit = macvlan_start_xmit, 1189 .ndo_change_mtu = macvlan_change_mtu, 1190 .ndo_fix_features = macvlan_fix_features, 1191 .ndo_change_rx_flags = macvlan_change_rx_flags, 1192 .ndo_set_mac_address = macvlan_set_mac_address, 1193 .ndo_set_rx_mode = macvlan_set_mac_lists, 1194 .ndo_get_stats64 = macvlan_dev_get_stats64, 1195 .ndo_validate_addr = eth_validate_addr, 1196 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1197 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1198 .ndo_fdb_add = macvlan_fdb_add, 1199 .ndo_fdb_del = macvlan_fdb_del, 1200 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1201 #ifdef CONFIG_NET_POLL_CONTROLLER 1202 .ndo_poll_controller = macvlan_dev_poll_controller, 1203 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1204 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1205 #endif 1206 .ndo_get_iflink = macvlan_dev_get_iflink, 1207 .ndo_features_check = passthru_features_check, 1208 .ndo_hwtstamp_get = macvlan_hwtstamp_get, 1209 .ndo_hwtstamp_set = macvlan_hwtstamp_set, 1210 }; 1211 1212 static void macvlan_dev_free(struct net_device *dev) 1213 { 1214 struct macvlan_dev *vlan = netdev_priv(dev); 1215 1216 /* Get rid of the macvlan's reference to lowerdev */ 1217 netdev_put(vlan->lowerdev, &vlan->dev_tracker); 1218 } 1219 1220 void macvlan_common_setup(struct net_device *dev) 1221 { 1222 ether_setup(dev); 1223 1224 /* ether_setup() has set dev->min_mtu to ETH_MIN_MTU. */ 1225 dev->max_mtu = ETH_MAX_MTU; 1226 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1227 netif_keep_dst(dev); 1228 dev->priv_flags |= IFF_UNICAST_FLT; 1229 dev->change_proto_down = true; 1230 dev->netdev_ops = &macvlan_netdev_ops; 1231 dev->needs_free_netdev = true; 1232 dev->priv_destructor = macvlan_dev_free; 1233 dev->header_ops = &macvlan_hard_header_ops; 1234 dev->ethtool_ops = &macvlan_ethtool_ops; 1235 } 1236 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1237 1238 static void macvlan_setup(struct net_device *dev) 1239 { 1240 macvlan_common_setup(dev); 1241 dev->priv_flags |= IFF_NO_QUEUE; 1242 } 1243 1244 static int macvlan_port_create(struct net_device *dev) 1245 { 1246 struct macvlan_port *port; 1247 unsigned int i; 1248 int err; 1249 1250 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1251 return -EINVAL; 1252 1253 if (netdev_is_rx_handler_busy(dev)) 1254 return -EBUSY; 1255 1256 port = kzalloc_obj(*port); 1257 if (port == NULL) 1258 return -ENOMEM; 1259 1260 port->dev = dev; 1261 ether_addr_copy(port->perm_addr, dev->dev_addr); 1262 INIT_LIST_HEAD(&port->vlans); 1263 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1264 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1265 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1266 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1267 1268 port->bc_queue_len_used = 0; 1269 port->bc_cutoff = 1; 1270 skb_queue_head_init(&port->bc_queue); 1271 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1272 1273 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1274 if (err) 1275 kfree(port); 1276 else 1277 dev->priv_flags |= IFF_MACVLAN_PORT; 1278 return err; 1279 } 1280 1281 static void macvlan_port_destroy(struct net_device *dev) 1282 { 1283 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1284 struct sk_buff *skb; 1285 1286 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1287 netdev_rx_handler_unregister(dev); 1288 1289 /* After this point, no packet can schedule bc_work anymore, 1290 * but we need to cancel it and purge left skbs if any. 1291 */ 1292 cancel_work_sync(&port->bc_work); 1293 1294 while ((skb = __skb_dequeue(&port->bc_queue))) { 1295 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 1296 1297 if (src) 1298 dev_put(src->dev); 1299 1300 kfree_skb(skb); 1301 } 1302 1303 /* If the lower device address has been changed by passthru 1304 * macvlan, put it back. 1305 */ 1306 if (macvlan_passthru(port) && 1307 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { 1308 struct sockaddr_storage ss; 1309 1310 ss.ss_family = port->dev->type; 1311 memcpy(&ss.__data, port->perm_addr, port->dev->addr_len); 1312 dev_set_mac_address(port->dev, &ss, NULL); 1313 } 1314 1315 kfree(port); 1316 } 1317 1318 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[], 1319 struct netlink_ext_ack *extack) 1320 { 1321 struct nlattr *nla, *head; 1322 int rem, len; 1323 1324 if (tb[IFLA_ADDRESS]) { 1325 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1326 return -EINVAL; 1327 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1328 return -EADDRNOTAVAIL; 1329 } 1330 1331 if (!data) 1332 return 0; 1333 1334 if (data[IFLA_MACVLAN_FLAGS] && 1335 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC | 1336 MACVLAN_FLAG_NODST)) 1337 return -EINVAL; 1338 1339 if (data[IFLA_MACVLAN_MODE]) { 1340 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1341 case MACVLAN_MODE_PRIVATE: 1342 case MACVLAN_MODE_VEPA: 1343 case MACVLAN_MODE_BRIDGE: 1344 case MACVLAN_MODE_PASSTHRU: 1345 case MACVLAN_MODE_SOURCE: 1346 break; 1347 default: 1348 return -EINVAL; 1349 } 1350 } 1351 1352 if (data[IFLA_MACVLAN_MACADDR_MODE]) { 1353 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1354 case MACVLAN_MACADDR_ADD: 1355 case MACVLAN_MACADDR_DEL: 1356 case MACVLAN_MACADDR_FLUSH: 1357 case MACVLAN_MACADDR_SET: 1358 break; 1359 default: 1360 return -EINVAL; 1361 } 1362 } 1363 1364 if (data[IFLA_MACVLAN_MACADDR]) { 1365 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1366 return -EINVAL; 1367 1368 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1369 return -EADDRNOTAVAIL; 1370 } 1371 1372 if (data[IFLA_MACVLAN_MACADDR_DATA]) { 1373 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1374 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1375 1376 nla_for_each_attr(nla, head, len, rem) { 1377 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1378 nla_len(nla) != ETH_ALEN) 1379 return -EINVAL; 1380 1381 if (!is_valid_ether_addr(nla_data(nla))) 1382 return -EADDRNOTAVAIL; 1383 } 1384 } 1385 1386 if (data[IFLA_MACVLAN_MACADDR_COUNT]) 1387 return -EINVAL; 1388 1389 return 0; 1390 } 1391 1392 /* 1393 * reconfigure list of remote source mac address 1394 * (only for macvlan devices in source mode) 1395 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1396 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1397 */ 1398 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1399 struct nlattr *data[]) 1400 { 1401 char *addr = NULL; 1402 int ret, rem, len; 1403 struct nlattr *nla, *head; 1404 struct macvlan_source_entry *entry; 1405 1406 if (data[IFLA_MACVLAN_MACADDR]) 1407 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1408 1409 if (mode == MACVLAN_MACADDR_ADD) { 1410 if (!addr) 1411 return -EINVAL; 1412 1413 return macvlan_hash_add_source(vlan, addr); 1414 1415 } else if (mode == MACVLAN_MACADDR_DEL) { 1416 if (!addr) 1417 return -EINVAL; 1418 1419 entry = macvlan_hash_lookup_source(vlan, addr); 1420 if (entry) { 1421 macvlan_hash_del_source(entry); 1422 vlan->macaddr_count--; 1423 } 1424 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1425 macvlan_flush_sources(vlan->port, vlan); 1426 } else if (mode == MACVLAN_MACADDR_SET) { 1427 macvlan_flush_sources(vlan->port, vlan); 1428 1429 if (addr) { 1430 ret = macvlan_hash_add_source(vlan, addr); 1431 if (ret) 1432 return ret; 1433 } 1434 1435 if (!data[IFLA_MACVLAN_MACADDR_DATA]) 1436 return 0; 1437 1438 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1439 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1440 1441 nla_for_each_attr(nla, head, len, rem) { 1442 addr = nla_data(nla); 1443 ret = macvlan_hash_add_source(vlan, addr); 1444 if (ret) 1445 return ret; 1446 } 1447 } else { 1448 return -EINVAL; 1449 } 1450 1451 return 0; 1452 } 1453 1454 int macvlan_common_newlink(struct net_device *dev, 1455 struct rtnl_newlink_params *params, 1456 struct netlink_ext_ack *extack) 1457 { 1458 struct net *link_net = rtnl_newlink_link_net(params); 1459 struct macvlan_dev *vlan = netdev_priv(dev); 1460 struct nlattr **data = params->data; 1461 struct nlattr **tb = params->tb; 1462 struct net_device *lowerdev; 1463 struct macvlan_port *port; 1464 bool create = false; 1465 int macmode; 1466 int err; 1467 1468 if (!tb[IFLA_LINK]) 1469 return -EINVAL; 1470 1471 lowerdev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); 1472 if (lowerdev == NULL) 1473 return -ENODEV; 1474 1475 /* When creating macvlans or macvtaps on top of other macvlans - use 1476 * the real device as the lowerdev. 1477 */ 1478 if (netif_is_macvlan(lowerdev)) 1479 lowerdev = macvlan_dev_real_dev(lowerdev); 1480 1481 if (!tb[IFLA_MTU]) 1482 dev->mtu = lowerdev->mtu; 1483 else if (dev->mtu > lowerdev->mtu) 1484 return -EINVAL; 1485 1486 /* MTU range: 68 - lowerdev->max_mtu */ 1487 dev->min_mtu = ETH_MIN_MTU; 1488 dev->max_mtu = lowerdev->max_mtu; 1489 1490 if (!tb[IFLA_ADDRESS]) 1491 eth_hw_addr_random(dev); 1492 1493 if (!netif_is_macvlan_port(lowerdev)) { 1494 err = macvlan_port_create(lowerdev); 1495 if (err < 0) 1496 return err; 1497 create = true; 1498 } 1499 port = macvlan_port_get_rtnl(lowerdev); 1500 1501 /* Only 1 macvlan device can be created in passthru mode */ 1502 if (macvlan_passthru(port)) { 1503 /* The macvlan port must be not created this time, 1504 * still goto destroy_macvlan_port for readability. 1505 */ 1506 err = -EINVAL; 1507 goto destroy_macvlan_port; 1508 } 1509 1510 vlan->lowerdev = lowerdev; 1511 vlan->dev = dev; 1512 vlan->port = port; 1513 vlan->set_features = MACVLAN_FEATURES; 1514 1515 vlan->mode = MACVLAN_MODE_VEPA; 1516 if (data && data[IFLA_MACVLAN_MODE]) 1517 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1518 1519 if (data && data[IFLA_MACVLAN_FLAGS]) 1520 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1521 1522 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1523 if (port->count) { 1524 err = -EINVAL; 1525 goto destroy_macvlan_port; 1526 } 1527 macvlan_set_passthru(port); 1528 eth_hw_addr_inherit(dev, lowerdev); 1529 } 1530 1531 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1532 if (vlan->mode != MACVLAN_MODE_SOURCE) { 1533 err = -EINVAL; 1534 goto destroy_macvlan_port; 1535 } 1536 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1537 err = macvlan_changelink_sources(vlan, macmode, data); 1538 if (err) 1539 goto destroy_macvlan_port; 1540 } 1541 1542 vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN; 1543 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) 1544 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]); 1545 1546 if (data && data[IFLA_MACVLAN_BC_CUTOFF]) 1547 update_port_bc_cutoff( 1548 vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF])); 1549 1550 err = register_netdevice(dev); 1551 if (err < 0) 1552 goto destroy_macvlan_port; 1553 1554 dev->priv_flags |= IFF_MACVLAN; 1555 err = netdev_upper_dev_link(lowerdev, dev, extack); 1556 if (err) 1557 goto unregister_netdev; 1558 1559 list_add_tail_rcu(&vlan->list, &port->vlans); 1560 update_port_bc_queue_len(vlan->port); 1561 netif_stacked_transfer_operstate(lowerdev, dev); 1562 linkwatch_fire_event(dev); 1563 1564 return 0; 1565 1566 unregister_netdev: 1567 /* macvlan_uninit would free the macvlan port */ 1568 unregister_netdevice(dev); 1569 return err; 1570 destroy_macvlan_port: 1571 /* the macvlan port may be freed by macvlan_uninit when fail to register. 1572 * so we destroy the macvlan port only when it's valid. 1573 */ 1574 if (macvlan_port_get_rtnl(lowerdev)) { 1575 macvlan_flush_sources(port, vlan); 1576 if (create) 1577 macvlan_port_destroy(port->dev); 1578 } 1579 /* @dev might have been made visible before an error was detected. 1580 * Make sure to observe an RCU grace period before our caller 1581 * (rtnl_newlink()) frees it. 1582 */ 1583 synchronize_net(); 1584 return err; 1585 } 1586 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1587 1588 static int macvlan_newlink(struct net_device *dev, 1589 struct rtnl_newlink_params *params, 1590 struct netlink_ext_ack *extack) 1591 { 1592 return macvlan_common_newlink(dev, params, extack); 1593 } 1594 1595 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1596 { 1597 struct macvlan_dev *vlan = netdev_priv(dev); 1598 1599 if (vlan->mode == MACVLAN_MODE_SOURCE) 1600 macvlan_flush_sources(vlan->port, vlan); 1601 list_del_rcu(&vlan->list); 1602 update_port_bc_queue_len(vlan->port); 1603 unregister_netdevice_queue(dev, head); 1604 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1605 } 1606 EXPORT_SYMBOL_GPL(macvlan_dellink); 1607 1608 static int macvlan_changelink(struct net_device *dev, 1609 struct nlattr *tb[], struct nlattr *data[], 1610 struct netlink_ext_ack *extack) 1611 { 1612 struct macvlan_dev *vlan = netdev_priv(dev); 1613 enum macvlan_mode mode; 1614 bool set_mode = false; 1615 enum macvlan_macaddr_mode macmode; 1616 int ret; 1617 1618 /* Validate mode, but don't set yet: setting flags may fail. */ 1619 if (data && data[IFLA_MACVLAN_MODE]) { 1620 set_mode = true; 1621 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1622 /* Passthrough mode can't be set or cleared dynamically */ 1623 if ((mode == MACVLAN_MODE_PASSTHRU) != 1624 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1625 return -EINVAL; 1626 if (vlan->mode == MACVLAN_MODE_SOURCE && 1627 vlan->mode != mode) 1628 macvlan_flush_sources(vlan->port, vlan); 1629 } 1630 1631 if (data && data[IFLA_MACVLAN_FLAGS]) { 1632 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1633 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1634 if (macvlan_passthru(vlan->port) && promisc) { 1635 int err; 1636 1637 if (flags & MACVLAN_FLAG_NOPROMISC) 1638 err = dev_set_promiscuity(vlan->lowerdev, -1); 1639 else 1640 err = dev_set_promiscuity(vlan->lowerdev, 1); 1641 if (err < 0) 1642 return err; 1643 } 1644 vlan->flags = flags; 1645 } 1646 1647 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) { 1648 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]); 1649 update_port_bc_queue_len(vlan->port); 1650 } 1651 1652 if (data && data[IFLA_MACVLAN_BC_CUTOFF]) 1653 update_port_bc_cutoff( 1654 vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF])); 1655 1656 if (set_mode) 1657 vlan->mode = mode; 1658 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1659 if (vlan->mode != MACVLAN_MODE_SOURCE) 1660 return -EINVAL; 1661 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1662 ret = macvlan_changelink_sources(vlan, macmode, data); 1663 if (ret) 1664 return ret; 1665 } 1666 return 0; 1667 } 1668 1669 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1670 { 1671 if (vlan->macaddr_count == 0) 1672 return 0; 1673 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1674 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1675 } 1676 1677 static size_t macvlan_get_size(const struct net_device *dev) 1678 { 1679 struct macvlan_dev *vlan = netdev_priv(dev); 1680 1681 return (0 1682 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1683 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1684 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1685 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1686 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */ 1687 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */ 1688 ); 1689 } 1690 1691 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1692 const struct macvlan_dev *vlan, 1693 const int i) 1694 { 1695 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1696 struct macvlan_source_entry *entry; 1697 1698 hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) { 1699 if (rcu_access_pointer(entry->vlan) != vlan) 1700 continue; 1701 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1702 return 1; 1703 } 1704 return 0; 1705 } 1706 1707 static int macvlan_fill_info(struct sk_buff *skb, 1708 const struct net_device *dev) 1709 { 1710 struct macvlan_dev *vlan = netdev_priv(dev); 1711 struct macvlan_port *port = vlan->port; 1712 int i; 1713 struct nlattr *nest; 1714 1715 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1716 goto nla_put_failure; 1717 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1718 goto nla_put_failure; 1719 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1720 goto nla_put_failure; 1721 if (vlan->macaddr_count > 0) { 1722 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA); 1723 if (nest == NULL) 1724 goto nla_put_failure; 1725 1726 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1727 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1728 goto nla_put_failure; 1729 } 1730 nla_nest_end(skb, nest); 1731 } 1732 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req)) 1733 goto nla_put_failure; 1734 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used)) 1735 goto nla_put_failure; 1736 if (port->bc_cutoff != 1 && 1737 nla_put_s32(skb, IFLA_MACVLAN_BC_CUTOFF, port->bc_cutoff)) 1738 goto nla_put_failure; 1739 return 0; 1740 1741 nla_put_failure: 1742 return -EMSGSIZE; 1743 } 1744 1745 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1746 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1747 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1748 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1749 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1750 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1751 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1752 [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 }, 1753 [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT }, 1754 [IFLA_MACVLAN_BC_CUTOFF] = { .type = NLA_S32 }, 1755 }; 1756 1757 int macvlan_link_register(struct rtnl_link_ops *ops) 1758 { 1759 /* common fields */ 1760 ops->validate = macvlan_validate; 1761 ops->maxtype = IFLA_MACVLAN_MAX; 1762 ops->policy = macvlan_policy; 1763 ops->changelink = macvlan_changelink; 1764 ops->get_size = macvlan_get_size; 1765 ops->fill_info = macvlan_fill_info; 1766 1767 return rtnl_link_register(ops); 1768 }; 1769 EXPORT_SYMBOL_GPL(macvlan_link_register); 1770 1771 static struct net *macvlan_get_link_net(const struct net_device *dev) 1772 { 1773 return dev_net(macvlan_dev_real_dev(dev)); 1774 } 1775 1776 static struct rtnl_link_ops macvlan_link_ops = { 1777 .kind = "macvlan", 1778 .setup = macvlan_setup, 1779 .newlink = macvlan_newlink, 1780 .dellink = macvlan_dellink, 1781 .get_link_net = macvlan_get_link_net, 1782 .priv_size = sizeof(struct macvlan_dev), 1783 }; 1784 1785 static void update_port_bc_queue_len(struct macvlan_port *port) 1786 { 1787 u32 max_bc_queue_len_req = 0; 1788 struct macvlan_dev *vlan; 1789 1790 list_for_each_entry(vlan, &port->vlans, list) { 1791 if (vlan->bc_queue_len_req > max_bc_queue_len_req) 1792 max_bc_queue_len_req = vlan->bc_queue_len_req; 1793 } 1794 port->bc_queue_len_used = max_bc_queue_len_req; 1795 } 1796 1797 static int macvlan_device_event(struct notifier_block *unused, 1798 unsigned long event, void *ptr) 1799 { 1800 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1801 struct macvlan_dev *vlan, *next; 1802 struct macvlan_port *port; 1803 LIST_HEAD(list_kill); 1804 1805 if (!netif_is_macvlan_port(dev)) 1806 return NOTIFY_DONE; 1807 1808 port = macvlan_port_get_rtnl(dev); 1809 1810 switch (event) { 1811 case NETDEV_UP: 1812 case NETDEV_DOWN: 1813 case NETDEV_CHANGE: 1814 list_for_each_entry(vlan, &port->vlans, list) 1815 netif_stacked_transfer_operstate(vlan->lowerdev, 1816 vlan->dev); 1817 break; 1818 case NETDEV_FEAT_CHANGE: 1819 list_for_each_entry(vlan, &port->vlans, list) { 1820 netif_inherit_tso_max(vlan->dev, dev); 1821 netdev_update_features(vlan->dev); 1822 } 1823 break; 1824 case NETDEV_CHANGEMTU: 1825 list_for_each_entry(vlan, &port->vlans, list) { 1826 if (vlan->dev->mtu <= dev->mtu) 1827 continue; 1828 dev_set_mtu(vlan->dev, dev->mtu); 1829 } 1830 break; 1831 case NETDEV_CHANGEADDR: 1832 if (!macvlan_passthru(port)) 1833 return NOTIFY_DONE; 1834 1835 vlan = list_first_entry_or_null(&port->vlans, 1836 struct macvlan_dev, 1837 list); 1838 1839 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr)) 1840 return NOTIFY_BAD; 1841 1842 break; 1843 case NETDEV_UNREGISTER: 1844 /* twiddle thumbs on netns device moves */ 1845 if (dev->reg_state != NETREG_UNREGISTERING) 1846 break; 1847 1848 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1849 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1850 unregister_netdevice_many(&list_kill); 1851 break; 1852 case NETDEV_PRE_TYPE_CHANGE: 1853 /* Forbid underlying device to change its type. */ 1854 return NOTIFY_BAD; 1855 1856 case NETDEV_NOTIFY_PEERS: 1857 case NETDEV_BONDING_FAILOVER: 1858 case NETDEV_RESEND_IGMP: 1859 /* Propagate to all vlans */ 1860 list_for_each_entry(vlan, &port->vlans, list) 1861 call_netdevice_notifiers(event, vlan->dev); 1862 } 1863 return NOTIFY_DONE; 1864 } 1865 1866 static struct notifier_block macvlan_notifier_block __read_mostly = { 1867 .notifier_call = macvlan_device_event, 1868 }; 1869 1870 static int __init macvlan_init_module(void) 1871 { 1872 int err; 1873 1874 register_netdevice_notifier(&macvlan_notifier_block); 1875 1876 err = macvlan_link_register(&macvlan_link_ops); 1877 if (err < 0) 1878 goto err1; 1879 return 0; 1880 err1: 1881 unregister_netdevice_notifier(&macvlan_notifier_block); 1882 return err; 1883 } 1884 1885 static void __exit macvlan_cleanup_module(void) 1886 { 1887 rtnl_link_unregister(&macvlan_link_ops); 1888 unregister_netdevice_notifier(&macvlan_notifier_block); 1889 } 1890 1891 module_init(macvlan_init_module); 1892 module_exit(macvlan_cleanup_module); 1893 1894 MODULE_LICENSE("GPL"); 1895 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1896 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1897 MODULE_ALIAS_RTNL_LINK("macvlan"); 1898