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 WRITE_ONCE(vlan->macaddr_count, vlan->macaddr_count + 1); 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 || !(READ_ONCE(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 (READ_ONCE(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 u32 bc_queue_len_used = READ_ONCE(port->bc_queue_len_used); 360 struct sk_buff *nskb; 361 int err = -ENOMEM; 362 363 if (skb_queue_len_lockless(&port->bc_queue) >= bc_queue_len_used) 364 goto err; 365 366 nskb = skb_clone(skb, GFP_ATOMIC); 367 if (!nskb) 368 goto err; 369 370 MACVLAN_SKB_CB(nskb)->src = src; 371 372 spin_lock(&port->bc_queue.lock); 373 if (skb_queue_len(&port->bc_queue) < bc_queue_len_used) { 374 if (src) 375 dev_hold(src->dev); 376 __skb_queue_tail(&port->bc_queue, nskb); 377 err = 0; 378 } 379 spin_unlock(&port->bc_queue.lock); 380 381 queue_work(system_dfl_wq, &port->bc_work); 382 383 if (err) 384 goto free_nskb; 385 386 return; 387 388 free_nskb: 389 kfree_skb_reason(nskb, SKB_DROP_REASON_MACVLAN_BROADCAST_BACKLOG); 390 err: 391 dev_core_stats_rx_dropped_inc(skb->dev); 392 } 393 394 static void macvlan_flush_sources(struct macvlan_port *port, 395 struct macvlan_dev *vlan) 396 { 397 struct macvlan_source_entry *entry; 398 struct hlist_node *next; 399 int i; 400 401 hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist) 402 if (rcu_access_pointer(entry->vlan) == vlan) 403 macvlan_hash_del_source(entry); 404 405 WRITE_ONCE(vlan->macaddr_count, 0); 406 } 407 408 static void macvlan_forward_source_one(struct sk_buff *skb, 409 struct macvlan_dev *vlan) 410 { 411 struct sk_buff *nskb; 412 struct net_device *dev; 413 int len; 414 int ret; 415 416 dev = vlan->dev; 417 if (unlikely(!(dev->flags & IFF_UP))) 418 return; 419 420 nskb = skb_clone(skb, GFP_ATOMIC); 421 if (!nskb) 422 return; 423 424 len = nskb->len + ETH_HLEN; 425 nskb->dev = dev; 426 427 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr)) 428 nskb->pkt_type = PACKET_HOST; 429 430 ret = __netif_rx(nskb); 431 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 432 } 433 434 static bool macvlan_forward_source(struct sk_buff *skb, 435 struct macvlan_port *port, 436 const unsigned char *addr) 437 { 438 struct macvlan_source_entry *entry; 439 u32 idx = macvlan_eth_hash(addr); 440 struct hlist_head *h = &port->vlan_source_hash[idx]; 441 bool consume = false; 442 443 hlist_for_each_entry_rcu(entry, h, hlist) { 444 if (ether_addr_equal_64bits(entry->addr, addr)) { 445 struct macvlan_dev *vlan = rcu_dereference(entry->vlan); 446 447 if (!vlan) 448 continue; 449 450 if (READ_ONCE(vlan->flags) & MACVLAN_FLAG_NODST) 451 consume = true; 452 macvlan_forward_source_one(skb, vlan); 453 } 454 } 455 456 return consume; 457 } 458 459 /* called under rcu_read_lock() from netif_receive_skb */ 460 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 461 { 462 struct macvlan_port *port; 463 struct sk_buff *skb = *pskb; 464 const struct ethhdr *eth = eth_hdr(skb); 465 const struct macvlan_dev *vlan; 466 const struct macvlan_dev *src; 467 struct net_device *dev; 468 unsigned int len = 0; 469 int ret; 470 rx_handler_result_t handle_res; 471 472 /* Packets from dev_loopback_xmit() do not have L2 header, bail out */ 473 if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) 474 return RX_HANDLER_PASS; 475 476 port = macvlan_port_get_rcu(skb->dev); 477 if (is_multicast_ether_addr(eth->h_dest)) { 478 unsigned int hash; 479 480 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); 481 if (!skb) 482 return RX_HANDLER_CONSUMED; 483 *pskb = skb; 484 eth = eth_hdr(skb); 485 if (macvlan_forward_source(skb, port, eth->h_source)) { 486 kfree_skb(skb); 487 return RX_HANDLER_CONSUMED; 488 } 489 src = macvlan_hash_lookup(port, eth->h_source); 490 if (src) { 491 enum macvlan_mode mode = READ_ONCE(src->mode); 492 493 if (mode != MACVLAN_MODE_VEPA && 494 mode != MACVLAN_MODE_BRIDGE) { 495 /* forward to original port. */ 496 vlan = src; 497 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 498 __netif_rx(skb); 499 handle_res = RX_HANDLER_CONSUMED; 500 goto out; 501 } 502 } 503 504 hash = mc_hash(NULL, eth->h_dest); 505 if (test_bit(hash, port->bc_filter)) 506 macvlan_broadcast_enqueue(port, src, skb); 507 else if (test_bit(hash, port->mc_filter)) 508 macvlan_multicast_rx(port, src, skb); 509 510 return RX_HANDLER_PASS; 511 } 512 513 if (macvlan_forward_source(skb, port, eth->h_source)) { 514 kfree_skb(skb); 515 return RX_HANDLER_CONSUMED; 516 } 517 if (macvlan_passthru(port)) 518 vlan = list_first_or_null_rcu(&port->vlans, 519 struct macvlan_dev, list); 520 else 521 vlan = macvlan_hash_lookup(port, eth->h_dest); 522 if (!vlan || READ_ONCE(vlan->mode) == MACVLAN_MODE_SOURCE) 523 return RX_HANDLER_PASS; 524 525 dev = vlan->dev; 526 if (unlikely(!(dev->flags & IFF_UP))) { 527 kfree_skb(skb); 528 return RX_HANDLER_CONSUMED; 529 } 530 len = skb->len + ETH_HLEN; 531 skb = skb_share_check(skb, GFP_ATOMIC); 532 if (!skb) { 533 ret = NET_RX_DROP; 534 handle_res = RX_HANDLER_CONSUMED; 535 goto out; 536 } 537 538 *pskb = skb; 539 skb->dev = dev; 540 skb->pkt_type = PACKET_HOST; 541 542 ret = NET_RX_SUCCESS; 543 handle_res = RX_HANDLER_ANOTHER; 544 out: 545 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 546 return handle_res; 547 } 548 549 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 550 { 551 const struct macvlan_dev *vlan = netdev_priv(dev); 552 const struct macvlan_port *port = vlan->port; 553 const struct macvlan_dev *dest; 554 555 if (READ_ONCE(vlan->mode) == MACVLAN_MODE_BRIDGE) { 556 const struct ethhdr *eth = skb_eth_hdr(skb); 557 558 /* send to other bridge ports directly */ 559 if (is_multicast_ether_addr(eth->h_dest)) { 560 skb_reset_mac_header(skb); 561 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 562 goto xmit_world; 563 } 564 565 dest = macvlan_hash_lookup(port, eth->h_dest); 566 if (dest && READ_ONCE(dest->mode) == MACVLAN_MODE_BRIDGE) { 567 /* send to lowerdev first for its network taps */ 568 dev_forward_skb(vlan->lowerdev, skb); 569 570 return NET_XMIT_SUCCESS; 571 } 572 } 573 xmit_world: 574 skb->dev = vlan->lowerdev; 575 return dev_queue_xmit_accel(skb, 576 netdev_get_sb_channel(dev) ? dev : NULL); 577 } 578 579 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 580 { 581 #ifdef CONFIG_NET_POLL_CONTROLLER 582 return netpoll_send_skb(vlan->netpoll, skb); 583 #else 584 BUG(); 585 return NETDEV_TX_OK; 586 #endif 587 } 588 589 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 590 struct net_device *dev) 591 { 592 struct macvlan_dev *vlan = netdev_priv(dev); 593 unsigned int len = skb->len; 594 int ret; 595 596 if (unlikely(netpoll_tx_running(dev))) 597 return macvlan_netpoll_send_skb(vlan, skb); 598 599 ret = macvlan_queue_xmit(skb, dev); 600 601 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 602 struct vlan_pcpu_stats *pcpu_stats; 603 604 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 605 u64_stats_update_begin(&pcpu_stats->syncp); 606 u64_stats_inc(&pcpu_stats->tx_packets); 607 u64_stats_add(&pcpu_stats->tx_bytes, len); 608 u64_stats_update_end(&pcpu_stats->syncp); 609 } else { 610 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 611 } 612 return ret; 613 } 614 615 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 616 unsigned short type, const void *daddr, 617 const void *saddr, unsigned len) 618 { 619 const struct macvlan_dev *vlan = netdev_priv(dev); 620 struct net_device *lowerdev = vlan->lowerdev; 621 622 return dev_hard_header(skb, lowerdev, type, daddr, 623 saddr ? : dev->dev_addr, len); 624 } 625 626 static const struct header_ops macvlan_hard_header_ops = { 627 .create = macvlan_hard_header, 628 .parse = eth_header_parse, 629 .cache = eth_header_cache, 630 .cache_update = eth_header_cache_update, 631 .parse_protocol = eth_header_parse_protocol, 632 }; 633 634 static int macvlan_open(struct net_device *dev) 635 { 636 struct macvlan_dev *vlan = netdev_priv(dev); 637 struct net_device *lowerdev = vlan->lowerdev; 638 int err; 639 640 if (macvlan_passthru(vlan->port)) { 641 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 642 err = dev_set_promiscuity(lowerdev, 1); 643 if (err < 0) 644 goto out; 645 } 646 goto hash_add; 647 } 648 649 err = -EADDRINUSE; 650 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 651 goto out; 652 653 /* Attempt to populate accel_priv which is used to offload the L2 654 * forwarding requests for unicast packets. 655 */ 656 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) 657 vlan->accel_priv = 658 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 659 660 /* If earlier attempt to offload failed, or accel_priv is not 661 * populated we must add the unicast address to the lower device. 662 */ 663 if (IS_ERR_OR_NULL(vlan->accel_priv)) { 664 vlan->accel_priv = NULL; 665 err = dev_uc_add(lowerdev, dev->dev_addr); 666 if (err < 0) 667 goto out; 668 } 669 670 if (dev->flags & IFF_ALLMULTI) { 671 err = dev_set_allmulti(lowerdev, 1); 672 if (err < 0) 673 goto del_unicast; 674 } 675 676 if (dev->flags & IFF_PROMISC) { 677 err = dev_set_promiscuity(lowerdev, 1); 678 if (err < 0) 679 goto clear_multi; 680 } 681 682 hash_add: 683 macvlan_hash_add(vlan); 684 return 0; 685 686 clear_multi: 687 if (dev->flags & IFF_ALLMULTI) 688 dev_set_allmulti(lowerdev, -1); 689 del_unicast: 690 if (vlan->accel_priv) { 691 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 692 vlan->accel_priv); 693 vlan->accel_priv = NULL; 694 } else { 695 dev_uc_del(lowerdev, dev->dev_addr); 696 } 697 out: 698 return err; 699 } 700 701 static int macvlan_stop(struct net_device *dev) 702 { 703 struct macvlan_dev *vlan = netdev_priv(dev); 704 struct net_device *lowerdev = vlan->lowerdev; 705 706 if (vlan->accel_priv) { 707 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 708 vlan->accel_priv); 709 vlan->accel_priv = NULL; 710 } 711 712 dev_uc_unsync(lowerdev, dev); 713 dev_mc_unsync(lowerdev, dev); 714 715 if (macvlan_passthru(vlan->port)) { 716 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 717 dev_set_promiscuity(lowerdev, -1); 718 goto hash_del; 719 } 720 721 if (dev->flags & IFF_ALLMULTI) 722 dev_set_allmulti(lowerdev, -1); 723 724 if (dev->flags & IFF_PROMISC) 725 dev_set_promiscuity(lowerdev, -1); 726 727 dev_uc_del(lowerdev, dev->dev_addr); 728 729 hash_del: 730 macvlan_hash_del(vlan, !dev->dismantle); 731 return 0; 732 } 733 734 static int macvlan_sync_address(struct net_device *dev, 735 const unsigned char *addr) 736 { 737 struct macvlan_dev *vlan = netdev_priv(dev); 738 struct net_device *lowerdev = vlan->lowerdev; 739 struct macvlan_port *port = vlan->port; 740 int err; 741 742 if (!(dev->flags & IFF_UP)) { 743 /* Just copy in the new address */ 744 eth_hw_addr_set(dev, addr); 745 } else { 746 /* Rehash and update the device filters */ 747 if (macvlan_addr_busy(vlan->port, addr)) 748 return -EADDRINUSE; 749 750 if (!macvlan_passthru(port)) { 751 err = dev_uc_add(lowerdev, addr); 752 if (err) 753 return err; 754 755 dev_uc_del(lowerdev, dev->dev_addr); 756 } 757 758 macvlan_hash_change_addr(vlan, addr); 759 } 760 if (macvlan_passthru(port) && !macvlan_addr_change(port)) { 761 /* Since addr_change isn't set, we are here due to lower 762 * device change. Save the lower-dev address so we can 763 * restore it later. 764 */ 765 ether_addr_copy(vlan->port->perm_addr, 766 lowerdev->dev_addr); 767 } 768 macvlan_clear_addr_change(port); 769 return 0; 770 } 771 772 static int macvlan_set_mac_address(struct net_device *dev, void *p) 773 { 774 struct macvlan_dev *vlan = netdev_priv(dev); 775 struct sockaddr_storage *addr = p; 776 777 if (!is_valid_ether_addr(addr->__data)) 778 return -EADDRNOTAVAIL; 779 780 /* If the addresses are the same, this is a no-op */ 781 if (ether_addr_equal(dev->dev_addr, addr->__data)) 782 return 0; 783 784 if (READ_ONCE(vlan->mode) == MACVLAN_MODE_PASSTHRU) { 785 macvlan_set_addr_change(vlan->port); 786 return dev_set_mac_address(vlan->lowerdev, addr, NULL); 787 } 788 789 if (macvlan_addr_busy(vlan->port, addr->__data)) 790 return -EADDRINUSE; 791 792 return macvlan_sync_address(dev, addr->__data); 793 } 794 795 static void macvlan_change_rx_flags(struct net_device *dev, int change) 796 { 797 struct macvlan_dev *vlan = netdev_priv(dev); 798 struct net_device *lowerdev = vlan->lowerdev; 799 800 if (dev->flags & IFF_UP) { 801 if (change & IFF_ALLMULTI) 802 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 803 if (!macvlan_passthru(vlan->port) && change & IFF_PROMISC) 804 dev_set_promiscuity(lowerdev, 805 dev->flags & IFF_PROMISC ? 1 : -1); 806 807 } 808 } 809 810 static void macvlan_compute_filter(unsigned long *mc_filter, 811 struct net_device *dev, 812 struct macvlan_dev *vlan, int cutoff) 813 { 814 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 815 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 816 } else { 817 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 818 struct netdev_hw_addr *ha; 819 820 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 821 netdev_for_each_mc_addr(ha, dev) { 822 if (!vlan && ha->synced <= cutoff) 823 continue; 824 825 __set_bit(mc_hash(vlan, ha->addr), filter); 826 } 827 828 __set_bit(mc_hash(vlan, dev->broadcast), filter); 829 830 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 831 } 832 } 833 834 static void macvlan_recompute_bc_filter(struct macvlan_dev *vlan) 835 { 836 if (vlan->port->bc_cutoff < 0) { 837 bitmap_zero(vlan->port->bc_filter, MACVLAN_MC_FILTER_SZ); 838 return; 839 } 840 841 macvlan_compute_filter(vlan->port->bc_filter, vlan->lowerdev, NULL, 842 vlan->port->bc_cutoff); 843 } 844 845 static void macvlan_set_mac_lists(struct net_device *dev) 846 { 847 struct macvlan_dev *vlan = netdev_priv(dev); 848 849 macvlan_compute_filter(vlan->mc_filter, dev, vlan, 0); 850 851 dev_uc_sync(vlan->lowerdev, dev); 852 dev_mc_sync(vlan->lowerdev, dev); 853 854 /* This is slightly inaccurate as we're including the subscription 855 * list of vlan->lowerdev too. 856 * 857 * Bug alert: This only works if everyone has the same broadcast 858 * address as lowerdev. As soon as someone changes theirs this 859 * will break. 860 * 861 * However, this is already broken as when you change your broadcast 862 * address we don't get called. 863 * 864 * The solution is to maintain a list of broadcast addresses like 865 * we do for uc/mc, if you care. 866 */ 867 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL, 868 0); 869 macvlan_recompute_bc_filter(vlan); 870 } 871 872 static void update_port_bc_cutoff(struct macvlan_dev *vlan, int cutoff) 873 { 874 if (vlan->port->bc_cutoff == cutoff) 875 return; 876 877 WRITE_ONCE(vlan->port->bc_cutoff, cutoff); 878 macvlan_recompute_bc_filter(vlan); 879 } 880 881 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 882 { 883 struct macvlan_dev *vlan = netdev_priv(dev); 884 885 if (vlan->lowerdev->mtu < new_mtu) 886 return -EINVAL; 887 WRITE_ONCE(dev->mtu, new_mtu); 888 return 0; 889 } 890 891 static int macvlan_hwtstamp_get(struct net_device *dev, 892 struct kernel_hwtstamp_config *cfg) 893 { 894 struct net_device *real_dev = macvlan_dev_real_dev(dev); 895 896 return generic_hwtstamp_get_lower(real_dev, cfg); 897 } 898 899 static int macvlan_hwtstamp_set(struct net_device *dev, 900 struct kernel_hwtstamp_config *cfg, 901 struct netlink_ext_ack *extack) 902 { 903 struct net_device *real_dev = macvlan_dev_real_dev(dev); 904 905 if (!net_eq(dev_net(dev), &init_net)) 906 return -EOPNOTSUPP; 907 908 return generic_hwtstamp_set_lower(real_dev, cfg, extack); 909 } 910 911 /* 912 * macvlan network devices have devices nesting below it and are a special 913 * "super class" of normal network devices; split their locks off into a 914 * separate class since they always nest. 915 */ 916 static struct lock_class_key macvlan_netdev_addr_lock_key; 917 918 #define ALWAYS_ON_OFFLOADS \ 919 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ 920 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL) 921 922 #define ALWAYS_ON_FEATURES ALWAYS_ON_OFFLOADS 923 924 #define MACVLAN_FEATURES \ 925 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 926 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \ 927 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 928 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 929 930 #define MACVLAN_STATE_MASK \ 931 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 932 933 static void macvlan_set_lockdep_class(struct net_device *dev) 934 { 935 netdev_lockdep_set_classes(dev); 936 lockdep_set_class(&dev->addr_list_lock, 937 &macvlan_netdev_addr_lock_key); 938 } 939 940 static int macvlan_init(struct net_device *dev) 941 { 942 struct macvlan_dev *vlan = netdev_priv(dev); 943 struct net_device *lowerdev = vlan->lowerdev; 944 struct macvlan_port *port = vlan->port; 945 946 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 947 (lowerdev->state & MACVLAN_STATE_MASK); 948 dev->features = lowerdev->features & MACVLAN_FEATURES; 949 dev->features |= ALWAYS_ON_FEATURES; 950 dev->hw_features |= NETIF_F_LRO; 951 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 952 dev->vlan_features |= ALWAYS_ON_OFFLOADS; 953 dev->hw_enc_features |= dev->features; 954 dev->lltx = true; 955 netif_inherit_tso_max(dev, lowerdev); 956 dev->hard_header_len = lowerdev->hard_header_len; 957 macvlan_set_lockdep_class(dev); 958 959 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 960 if (!vlan->pcpu_stats) 961 return -ENOMEM; 962 963 port->count += 1; 964 965 /* Get macvlan's reference to lowerdev */ 966 netdev_hold(lowerdev, &vlan->dev_tracker, GFP_KERNEL); 967 968 return 0; 969 } 970 971 static void macvlan_uninit(struct net_device *dev) 972 { 973 struct macvlan_dev *vlan = netdev_priv(dev); 974 struct macvlan_port *port = vlan->port; 975 976 free_percpu(vlan->pcpu_stats); 977 978 macvlan_flush_sources(port, vlan); 979 port->count -= 1; 980 if (!port->count) 981 macvlan_port_destroy(port->dev); 982 } 983 984 static void macvlan_dev_get_stats64(struct net_device *dev, 985 struct rtnl_link_stats64 *stats) 986 { 987 struct macvlan_dev *vlan = netdev_priv(dev); 988 989 if (vlan->pcpu_stats) { 990 struct vlan_pcpu_stats *p; 991 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 992 u32 rx_errors = 0, tx_dropped = 0; 993 unsigned int start; 994 int i; 995 996 for_each_possible_cpu(i) { 997 p = per_cpu_ptr(vlan->pcpu_stats, i); 998 do { 999 start = u64_stats_fetch_begin(&p->syncp); 1000 rx_packets = u64_stats_read(&p->rx_packets); 1001 rx_bytes = u64_stats_read(&p->rx_bytes); 1002 rx_multicast = u64_stats_read(&p->rx_multicast); 1003 tx_packets = u64_stats_read(&p->tx_packets); 1004 tx_bytes = u64_stats_read(&p->tx_bytes); 1005 } while (u64_stats_fetch_retry(&p->syncp, start)); 1006 1007 stats->rx_packets += rx_packets; 1008 stats->rx_bytes += rx_bytes; 1009 stats->multicast += rx_multicast; 1010 stats->tx_packets += tx_packets; 1011 stats->tx_bytes += tx_bytes; 1012 /* rx_errors & tx_dropped are u32, updated 1013 * without syncp protection. 1014 */ 1015 rx_errors += READ_ONCE(p->rx_errors); 1016 tx_dropped += READ_ONCE(p->tx_dropped); 1017 } 1018 stats->rx_errors = rx_errors; 1019 stats->rx_dropped = rx_errors; 1020 stats->tx_dropped = tx_dropped; 1021 } 1022 } 1023 1024 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 1025 __be16 proto, u16 vid) 1026 { 1027 struct macvlan_dev *vlan = netdev_priv(dev); 1028 struct net_device *lowerdev = vlan->lowerdev; 1029 1030 return vlan_vid_add(lowerdev, proto, vid); 1031 } 1032 1033 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 1034 __be16 proto, u16 vid) 1035 { 1036 struct macvlan_dev *vlan = netdev_priv(dev); 1037 struct net_device *lowerdev = vlan->lowerdev; 1038 1039 vlan_vid_del(lowerdev, proto, vid); 1040 return 0; 1041 } 1042 1043 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1044 struct net_device *dev, 1045 const unsigned char *addr, u16 vid, 1046 u16 flags, bool *notified, 1047 struct netlink_ext_ack *extack) 1048 { 1049 struct macvlan_dev *vlan = netdev_priv(dev); 1050 int err = -EINVAL; 1051 1052 /* Support unicast filter only on passthru devices. 1053 * Multicast filter should be allowed on all devices. 1054 */ 1055 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1056 return -EOPNOTSUPP; 1057 1058 if (flags & NLM_F_REPLACE) 1059 return -EOPNOTSUPP; 1060 1061 if (is_unicast_ether_addr(addr)) 1062 err = dev_uc_add_excl(dev, addr); 1063 else if (is_multicast_ether_addr(addr)) 1064 err = dev_mc_add_excl(dev, addr); 1065 1066 return err; 1067 } 1068 1069 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 1070 struct net_device *dev, 1071 const unsigned char *addr, u16 vid, bool *notified, 1072 struct netlink_ext_ack *extack) 1073 { 1074 struct macvlan_dev *vlan = netdev_priv(dev); 1075 int err = -EINVAL; 1076 1077 /* Support unicast filter only on passthru devices. 1078 * Multicast filter should be allowed on all devices. 1079 */ 1080 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1081 return -EOPNOTSUPP; 1082 1083 if (is_unicast_ether_addr(addr)) 1084 err = dev_uc_del(dev, addr); 1085 else if (is_multicast_ether_addr(addr)) 1086 err = dev_mc_del(dev, addr); 1087 1088 return err; 1089 } 1090 1091 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 1092 struct ethtool_drvinfo *drvinfo) 1093 { 1094 strscpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 1095 strscpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 1096 } 1097 1098 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 1099 struct ethtool_link_ksettings *cmd) 1100 { 1101 const struct macvlan_dev *vlan = netdev_priv(dev); 1102 1103 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 1104 } 1105 1106 static int macvlan_ethtool_get_ts_info(struct net_device *dev, 1107 struct kernel_ethtool_ts_info *info) 1108 { 1109 struct net_device *real_dev = macvlan_dev_real_dev(dev); 1110 1111 return ethtool_get_ts_info_by_layer(real_dev, info); 1112 } 1113 1114 static netdev_features_t macvlan_fix_features(struct net_device *dev, 1115 netdev_features_t features) 1116 { 1117 struct macvlan_dev *vlan = netdev_priv(dev); 1118 netdev_features_t lowerdev_features = vlan->lowerdev->features; 1119 netdev_features_t mask; 1120 1121 features |= NETIF_F_ALL_FOR_ALL; 1122 features &= (vlan->set_features | ~MACVLAN_FEATURES); 1123 mask = features; 1124 1125 lowerdev_features &= (features | ~NETIF_F_LRO); 1126 features = netdev_increment_features(lowerdev_features, features, mask); 1127 features |= ALWAYS_ON_FEATURES; 1128 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES); 1129 1130 return features; 1131 } 1132 1133 #ifdef CONFIG_NET_POLL_CONTROLLER 1134 static void macvlan_dev_poll_controller(struct net_device *dev) 1135 { 1136 return; 1137 } 1138 1139 static int macvlan_dev_netpoll_setup(struct net_device *dev) 1140 { 1141 struct macvlan_dev *vlan = netdev_priv(dev); 1142 struct net_device *real_dev = vlan->lowerdev; 1143 struct netpoll *netpoll; 1144 int err; 1145 1146 netpoll = kzalloc_obj(*netpoll); 1147 err = -ENOMEM; 1148 if (!netpoll) 1149 goto out; 1150 1151 err = __netpoll_setup(netpoll, real_dev); 1152 if (err) { 1153 kfree(netpoll); 1154 goto out; 1155 } 1156 1157 vlan->netpoll = netpoll; 1158 1159 out: 1160 return err; 1161 } 1162 1163 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1164 { 1165 struct macvlan_dev *vlan = netdev_priv(dev); 1166 struct netpoll *netpoll = vlan->netpoll; 1167 1168 if (!netpoll) 1169 return; 1170 1171 vlan->netpoll = NULL; 1172 1173 __netpoll_free(netpoll); 1174 } 1175 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1176 1177 static int macvlan_dev_get_iflink(const struct net_device *dev) 1178 { 1179 struct macvlan_dev *vlan = netdev_priv(dev); 1180 1181 return READ_ONCE(vlan->lowerdev->ifindex); 1182 } 1183 1184 static const struct ethtool_ops macvlan_ethtool_ops = { 1185 .get_link = ethtool_op_get_link, 1186 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1187 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1188 .get_ts_info = macvlan_ethtool_get_ts_info, 1189 }; 1190 1191 static const struct net_device_ops macvlan_netdev_ops = { 1192 .ndo_init = macvlan_init, 1193 .ndo_uninit = macvlan_uninit, 1194 .ndo_open = macvlan_open, 1195 .ndo_stop = macvlan_stop, 1196 .ndo_start_xmit = macvlan_start_xmit, 1197 .ndo_change_mtu = macvlan_change_mtu, 1198 .ndo_fix_features = macvlan_fix_features, 1199 .ndo_change_rx_flags = macvlan_change_rx_flags, 1200 .ndo_set_mac_address = macvlan_set_mac_address, 1201 .ndo_set_rx_mode = macvlan_set_mac_lists, 1202 .ndo_get_stats64 = macvlan_dev_get_stats64, 1203 .ndo_validate_addr = eth_validate_addr, 1204 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1205 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1206 .ndo_fdb_add = macvlan_fdb_add, 1207 .ndo_fdb_del = macvlan_fdb_del, 1208 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1209 #ifdef CONFIG_NET_POLL_CONTROLLER 1210 .ndo_poll_controller = macvlan_dev_poll_controller, 1211 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1212 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1213 #endif 1214 .ndo_get_iflink = macvlan_dev_get_iflink, 1215 .ndo_features_check = passthru_features_check, 1216 .ndo_hwtstamp_get = macvlan_hwtstamp_get, 1217 .ndo_hwtstamp_set = macvlan_hwtstamp_set, 1218 }; 1219 1220 static void macvlan_dev_free(struct net_device *dev) 1221 { 1222 struct macvlan_dev *vlan = netdev_priv(dev); 1223 1224 /* Get rid of the macvlan's reference to lowerdev */ 1225 netdev_put(vlan->lowerdev, &vlan->dev_tracker); 1226 } 1227 1228 void macvlan_common_setup(struct net_device *dev) 1229 { 1230 ether_setup(dev); 1231 1232 /* ether_setup() has set dev->min_mtu to ETH_MIN_MTU. */ 1233 dev->max_mtu = ETH_MAX_MTU; 1234 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1235 netif_keep_dst(dev); 1236 dev->priv_flags |= IFF_UNICAST_FLT; 1237 dev->change_proto_down = true; 1238 dev->netdev_ops = &macvlan_netdev_ops; 1239 dev->needs_free_netdev = true; 1240 dev->priv_destructor = macvlan_dev_free; 1241 dev->header_ops = &macvlan_hard_header_ops; 1242 dev->ethtool_ops = &macvlan_ethtool_ops; 1243 } 1244 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1245 1246 static void macvlan_setup(struct net_device *dev) 1247 { 1248 macvlan_common_setup(dev); 1249 dev->priv_flags |= IFF_NO_QUEUE; 1250 } 1251 1252 static int macvlan_port_create(struct net_device *dev) 1253 { 1254 struct macvlan_port *port; 1255 unsigned int i; 1256 int err; 1257 1258 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1259 return -EINVAL; 1260 1261 if (netdev_is_rx_handler_busy(dev)) 1262 return -EBUSY; 1263 1264 port = kzalloc_obj(*port); 1265 if (port == NULL) 1266 return -ENOMEM; 1267 1268 port->dev = dev; 1269 ether_addr_copy(port->perm_addr, dev->dev_addr); 1270 INIT_LIST_HEAD(&port->vlans); 1271 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1272 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1273 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1274 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1275 1276 port->bc_queue_len_used = 0; 1277 port->bc_cutoff = 1; 1278 skb_queue_head_init(&port->bc_queue); 1279 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1280 1281 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1282 if (err) 1283 kfree(port); 1284 else 1285 dev->priv_flags |= IFF_MACVLAN_PORT; 1286 return err; 1287 } 1288 1289 static void macvlan_port_destroy(struct net_device *dev) 1290 { 1291 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1292 struct sk_buff *skb; 1293 1294 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1295 netdev_rx_handler_unregister(dev); 1296 1297 /* After this point, no packet can schedule bc_work anymore, 1298 * but we need to cancel it and purge left skbs if any. 1299 */ 1300 cancel_work_sync(&port->bc_work); 1301 1302 while ((skb = __skb_dequeue(&port->bc_queue))) { 1303 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 1304 1305 if (src) 1306 dev_put(src->dev); 1307 1308 kfree_skb(skb); 1309 } 1310 1311 /* If the lower device address has been changed by passthru 1312 * macvlan, put it back. 1313 */ 1314 if (macvlan_passthru(port) && 1315 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { 1316 struct sockaddr_storage ss; 1317 1318 ss.ss_family = port->dev->type; 1319 memcpy(&ss.__data, port->perm_addr, port->dev->addr_len); 1320 dev_set_mac_address(port->dev, &ss, NULL); 1321 } 1322 1323 kfree(port); 1324 } 1325 1326 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[], 1327 struct netlink_ext_ack *extack) 1328 { 1329 struct nlattr *nla, *head; 1330 int rem, len; 1331 1332 if (tb[IFLA_ADDRESS]) { 1333 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1334 return -EINVAL; 1335 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1336 return -EADDRNOTAVAIL; 1337 } 1338 1339 if (!data) 1340 return 0; 1341 1342 if (data[IFLA_MACVLAN_FLAGS] && 1343 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC | 1344 MACVLAN_FLAG_NODST)) 1345 return -EINVAL; 1346 1347 if (data[IFLA_MACVLAN_MODE]) { 1348 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1349 case MACVLAN_MODE_PRIVATE: 1350 case MACVLAN_MODE_VEPA: 1351 case MACVLAN_MODE_BRIDGE: 1352 case MACVLAN_MODE_PASSTHRU: 1353 case MACVLAN_MODE_SOURCE: 1354 break; 1355 default: 1356 return -EINVAL; 1357 } 1358 } 1359 1360 if (data[IFLA_MACVLAN_MACADDR_MODE]) { 1361 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1362 case MACVLAN_MACADDR_ADD: 1363 case MACVLAN_MACADDR_DEL: 1364 case MACVLAN_MACADDR_FLUSH: 1365 case MACVLAN_MACADDR_SET: 1366 break; 1367 default: 1368 return -EINVAL; 1369 } 1370 } 1371 1372 if (data[IFLA_MACVLAN_MACADDR]) { 1373 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1374 return -EINVAL; 1375 1376 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1377 return -EADDRNOTAVAIL; 1378 } 1379 1380 if (data[IFLA_MACVLAN_MACADDR_DATA]) { 1381 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1382 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1383 1384 nla_for_each_attr(nla, head, len, rem) { 1385 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1386 nla_len(nla) != ETH_ALEN) 1387 return -EINVAL; 1388 1389 if (!is_valid_ether_addr(nla_data(nla))) 1390 return -EADDRNOTAVAIL; 1391 } 1392 } 1393 1394 if (data[IFLA_MACVLAN_MACADDR_COUNT]) 1395 return -EINVAL; 1396 1397 return 0; 1398 } 1399 1400 /* 1401 * reconfigure list of remote source mac address 1402 * (only for macvlan devices in source mode) 1403 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1404 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1405 */ 1406 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1407 struct nlattr *data[]) 1408 { 1409 char *addr = NULL; 1410 int ret, rem, len; 1411 struct nlattr *nla, *head; 1412 struct macvlan_source_entry *entry; 1413 1414 if (data[IFLA_MACVLAN_MACADDR]) 1415 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1416 1417 if (mode == MACVLAN_MACADDR_ADD) { 1418 if (!addr) 1419 return -EINVAL; 1420 1421 return macvlan_hash_add_source(vlan, addr); 1422 1423 } else if (mode == MACVLAN_MACADDR_DEL) { 1424 if (!addr) 1425 return -EINVAL; 1426 1427 entry = macvlan_hash_lookup_source(vlan, addr); 1428 if (entry) { 1429 macvlan_hash_del_source(entry); 1430 WRITE_ONCE(vlan->macaddr_count, vlan->macaddr_count - 1); 1431 } 1432 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1433 macvlan_flush_sources(vlan->port, vlan); 1434 } else if (mode == MACVLAN_MACADDR_SET) { 1435 macvlan_flush_sources(vlan->port, vlan); 1436 1437 if (addr) { 1438 ret = macvlan_hash_add_source(vlan, addr); 1439 if (ret) 1440 return ret; 1441 } 1442 1443 if (!data[IFLA_MACVLAN_MACADDR_DATA]) 1444 return 0; 1445 1446 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1447 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1448 1449 nla_for_each_attr(nla, head, len, rem) { 1450 addr = nla_data(nla); 1451 ret = macvlan_hash_add_source(vlan, addr); 1452 if (ret) 1453 return ret; 1454 } 1455 } else { 1456 return -EINVAL; 1457 } 1458 1459 return 0; 1460 } 1461 1462 int macvlan_common_newlink(struct net_device *dev, 1463 struct rtnl_newlink_params *params, 1464 struct netlink_ext_ack *extack) 1465 { 1466 struct net *link_net = rtnl_newlink_link_net(params); 1467 struct macvlan_dev *vlan = netdev_priv(dev); 1468 struct nlattr **data = params->data; 1469 struct nlattr **tb = params->tb; 1470 struct net_device *lowerdev; 1471 struct macvlan_port *port; 1472 bool create = false; 1473 int macmode; 1474 int err; 1475 1476 if (!tb[IFLA_LINK]) 1477 return -EINVAL; 1478 1479 lowerdev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); 1480 if (lowerdev == NULL) 1481 return -ENODEV; 1482 1483 /* When creating macvlans or macvtaps on top of other macvlans - use 1484 * the real device as the lowerdev. 1485 */ 1486 if (netif_is_macvlan(lowerdev)) 1487 lowerdev = macvlan_dev_real_dev(lowerdev); 1488 1489 if (!tb[IFLA_MTU]) 1490 dev->mtu = lowerdev->mtu; 1491 else if (dev->mtu > lowerdev->mtu) 1492 return -EINVAL; 1493 1494 /* MTU range: 68 - lowerdev->max_mtu */ 1495 dev->min_mtu = ETH_MIN_MTU; 1496 dev->max_mtu = lowerdev->max_mtu; 1497 1498 if (!tb[IFLA_ADDRESS]) 1499 eth_hw_addr_random(dev); 1500 1501 if (!netif_is_macvlan_port(lowerdev)) { 1502 err = macvlan_port_create(lowerdev); 1503 if (err < 0) 1504 return err; 1505 create = true; 1506 } 1507 port = macvlan_port_get_rtnl(lowerdev); 1508 1509 /* Only 1 macvlan device can be created in passthru mode */ 1510 if (macvlan_passthru(port)) { 1511 /* The macvlan port must be not created this time, 1512 * still goto destroy_macvlan_port for readability. 1513 */ 1514 err = -EINVAL; 1515 goto destroy_macvlan_port; 1516 } 1517 1518 vlan->lowerdev = lowerdev; 1519 vlan->dev = dev; 1520 vlan->port = port; 1521 vlan->set_features = MACVLAN_FEATURES; 1522 1523 vlan->mode = MACVLAN_MODE_VEPA; 1524 if (data && data[IFLA_MACVLAN_MODE]) 1525 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1526 1527 if (data && data[IFLA_MACVLAN_FLAGS]) 1528 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1529 1530 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1531 if (port->count) { 1532 err = -EINVAL; 1533 goto destroy_macvlan_port; 1534 } 1535 macvlan_set_passthru(port); 1536 eth_hw_addr_inherit(dev, lowerdev); 1537 } 1538 1539 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1540 if (vlan->mode != MACVLAN_MODE_SOURCE) { 1541 err = -EINVAL; 1542 goto destroy_macvlan_port; 1543 } 1544 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1545 err = macvlan_changelink_sources(vlan, macmode, data); 1546 if (err) 1547 goto destroy_macvlan_port; 1548 } 1549 1550 vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN; 1551 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) 1552 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]); 1553 1554 if (data && data[IFLA_MACVLAN_BC_CUTOFF]) 1555 update_port_bc_cutoff( 1556 vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF])); 1557 1558 err = register_netdevice(dev); 1559 if (err < 0) 1560 goto destroy_macvlan_port; 1561 1562 dev->priv_flags |= IFF_MACVLAN; 1563 err = netdev_upper_dev_link(lowerdev, dev, extack); 1564 if (err) 1565 goto unregister_netdev; 1566 1567 list_add_tail_rcu(&vlan->list, &port->vlans); 1568 update_port_bc_queue_len(vlan->port); 1569 netif_stacked_transfer_operstate(lowerdev, dev); 1570 linkwatch_fire_event(dev); 1571 1572 return 0; 1573 1574 unregister_netdev: 1575 /* macvlan_uninit would free the macvlan port */ 1576 unregister_netdevice(dev); 1577 return err; 1578 destroy_macvlan_port: 1579 /* the macvlan port may be freed by macvlan_uninit when fail to register. 1580 * so we destroy the macvlan port only when it's valid. 1581 */ 1582 if (macvlan_port_get_rtnl(lowerdev)) { 1583 macvlan_flush_sources(port, vlan); 1584 if (create) 1585 macvlan_port_destroy(port->dev); 1586 } 1587 /* @dev might have been made visible before an error was detected. 1588 * Make sure to observe an RCU grace period before our caller 1589 * (rtnl_newlink()) frees it. 1590 */ 1591 synchronize_net(); 1592 return err; 1593 } 1594 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1595 1596 static int macvlan_newlink(struct net_device *dev, 1597 struct rtnl_newlink_params *params, 1598 struct netlink_ext_ack *extack) 1599 { 1600 return macvlan_common_newlink(dev, params, extack); 1601 } 1602 1603 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1604 { 1605 struct macvlan_dev *vlan = netdev_priv(dev); 1606 1607 if (vlan->mode == MACVLAN_MODE_SOURCE) 1608 macvlan_flush_sources(vlan->port, vlan); 1609 list_del_rcu(&vlan->list); 1610 update_port_bc_queue_len(vlan->port); 1611 unregister_netdevice_queue(dev, head); 1612 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1613 } 1614 EXPORT_SYMBOL_GPL(macvlan_dellink); 1615 1616 static int macvlan_changelink(struct net_device *dev, 1617 struct nlattr *tb[], struct nlattr *data[], 1618 struct netlink_ext_ack *extack) 1619 { 1620 struct macvlan_dev *vlan = netdev_priv(dev); 1621 enum macvlan_mode mode; 1622 bool set_mode = false; 1623 enum macvlan_macaddr_mode macmode; 1624 int ret; 1625 1626 /* Validate mode, but don't set yet: setting flags may fail. */ 1627 if (data && data[IFLA_MACVLAN_MODE]) { 1628 set_mode = true; 1629 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1630 /* Passthrough mode can't be set or cleared dynamically */ 1631 if ((mode == MACVLAN_MODE_PASSTHRU) != 1632 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1633 return -EINVAL; 1634 if (vlan->mode == MACVLAN_MODE_SOURCE && 1635 vlan->mode != mode) 1636 macvlan_flush_sources(vlan->port, vlan); 1637 } 1638 1639 if (data && data[IFLA_MACVLAN_FLAGS]) { 1640 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1641 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1642 if (macvlan_passthru(vlan->port) && promisc) { 1643 int err; 1644 1645 if (flags & MACVLAN_FLAG_NOPROMISC) 1646 err = dev_set_promiscuity(vlan->lowerdev, -1); 1647 else 1648 err = dev_set_promiscuity(vlan->lowerdev, 1); 1649 if (err < 0) 1650 return err; 1651 } 1652 WRITE_ONCE(vlan->flags, flags); 1653 } 1654 1655 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) { 1656 WRITE_ONCE(vlan->bc_queue_len_req, 1657 nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN])); 1658 update_port_bc_queue_len(vlan->port); 1659 } 1660 1661 if (data && data[IFLA_MACVLAN_BC_CUTOFF]) 1662 update_port_bc_cutoff( 1663 vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF])); 1664 1665 if (set_mode) 1666 WRITE_ONCE(vlan->mode, mode); 1667 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1668 if (vlan->mode != MACVLAN_MODE_SOURCE) 1669 return -EINVAL; 1670 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1671 ret = macvlan_changelink_sources(vlan, macmode, data); 1672 if (ret) 1673 return ret; 1674 } 1675 return 0; 1676 } 1677 1678 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1679 { 1680 unsigned int macaddr_count = READ_ONCE(vlan->macaddr_count); 1681 1682 if (!macaddr_count) 1683 return 0; 1684 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1685 + macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1686 } 1687 1688 static size_t macvlan_get_size(const struct net_device *dev) 1689 { 1690 struct macvlan_dev *vlan = netdev_priv(dev); 1691 1692 return (0 1693 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1694 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1695 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1696 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1697 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */ 1698 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */ 1699 + nla_total_size(4) /* IFLA_MACVLAN_BC_CUTOFF */ 1700 ); 1701 } 1702 1703 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1704 const struct macvlan_dev *vlan, 1705 const int i) 1706 { 1707 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1708 const struct macvlan_source_entry *entry; 1709 int cnt = 0; 1710 1711 hlist_for_each_entry_rcu(entry, h, hlist) { 1712 if (rcu_access_pointer(entry->vlan) != vlan) 1713 continue; 1714 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1715 return -EMSGSIZE; 1716 cnt++; 1717 } 1718 return cnt; 1719 } 1720 1721 static int macvlan_fill_info(struct sk_buff *skb, 1722 const struct net_device *dev) 1723 { 1724 const struct macvlan_dev *vlan = netdev_priv(dev); 1725 struct macvlan_port *port = vlan->port; 1726 unsigned int macaddr_count = 0; 1727 struct nlattr *nest, *attr; 1728 int bc_cutoff, cnt, i; 1729 1730 rcu_read_lock(); 1731 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, READ_ONCE(vlan->mode))) 1732 goto nla_put_failure; 1733 1734 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, READ_ONCE(vlan->flags))) 1735 goto nla_put_failure; 1736 1737 attr = nla_reserve(skb, IFLA_MACVLAN_MACADDR_COUNT, sizeof(u32)); 1738 if (!attr) 1739 goto nla_put_failure; 1740 1741 if (READ_ONCE(vlan->macaddr_count) > 0) { 1742 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA); 1743 if (nest == NULL) 1744 goto nla_put_failure; 1745 1746 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1747 cnt = macvlan_fill_info_macaddr(skb, vlan, i); 1748 if (cnt < 0) 1749 goto nla_put_failure; 1750 macaddr_count += cnt; 1751 } 1752 if (!macaddr_count) 1753 nla_nest_cancel(skb, nest); 1754 else if (nla_nest_end_safe(skb, nest) < 0) 1755 goto nla_put_failure; 1756 } 1757 *(u32 *)nla_data(attr) = macaddr_count; 1758 1759 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, 1760 READ_ONCE(vlan->bc_queue_len_req))) 1761 goto nla_put_failure; 1762 1763 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, 1764 READ_ONCE(port->bc_queue_len_used))) 1765 goto nla_put_failure; 1766 1767 bc_cutoff = READ_ONCE(port->bc_cutoff); 1768 if (bc_cutoff != 1 && 1769 nla_put_s32(skb, IFLA_MACVLAN_BC_CUTOFF, bc_cutoff)) 1770 goto nla_put_failure; 1771 1772 rcu_read_unlock(); 1773 return 0; 1774 1775 nla_put_failure: 1776 rcu_read_unlock(); 1777 return -EMSGSIZE; 1778 } 1779 1780 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1781 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1782 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1783 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1784 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1785 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1786 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1787 [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 }, 1788 [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT }, 1789 [IFLA_MACVLAN_BC_CUTOFF] = { .type = NLA_S32 }, 1790 }; 1791 1792 int macvlan_link_register(struct rtnl_link_ops *ops) 1793 { 1794 /* common fields */ 1795 ops->validate = macvlan_validate; 1796 ops->maxtype = IFLA_MACVLAN_MAX; 1797 ops->policy = macvlan_policy; 1798 ops->changelink = macvlan_changelink; 1799 ops->get_size = macvlan_get_size; 1800 ops->fill_info = macvlan_fill_info; 1801 1802 return rtnl_link_register(ops); 1803 }; 1804 EXPORT_SYMBOL_GPL(macvlan_link_register); 1805 1806 static struct net *macvlan_get_link_net(const struct net_device *dev) 1807 { 1808 return dev_net(macvlan_dev_real_dev(dev)); 1809 } 1810 1811 static struct rtnl_link_ops macvlan_link_ops = { 1812 .kind = "macvlan", 1813 .setup = macvlan_setup, 1814 .newlink = macvlan_newlink, 1815 .dellink = macvlan_dellink, 1816 .get_link_net = macvlan_get_link_net, 1817 .priv_size = sizeof(struct macvlan_dev), 1818 }; 1819 1820 static void update_port_bc_queue_len(struct macvlan_port *port) 1821 { 1822 u32 max_bc_queue_len_req = 0; 1823 struct macvlan_dev *vlan; 1824 1825 list_for_each_entry(vlan, &port->vlans, list) { 1826 if (vlan->bc_queue_len_req > max_bc_queue_len_req) 1827 max_bc_queue_len_req = vlan->bc_queue_len_req; 1828 } 1829 WRITE_ONCE(port->bc_queue_len_used, max_bc_queue_len_req); 1830 } 1831 1832 static int macvlan_device_event(struct notifier_block *unused, 1833 unsigned long event, void *ptr) 1834 { 1835 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1836 struct macvlan_dev *vlan, *next; 1837 struct macvlan_port *port; 1838 LIST_HEAD(list_kill); 1839 1840 if (!netif_is_macvlan_port(dev)) 1841 return NOTIFY_DONE; 1842 1843 port = macvlan_port_get_rtnl(dev); 1844 1845 switch (event) { 1846 case NETDEV_UP: 1847 case NETDEV_DOWN: 1848 case NETDEV_CHANGE: 1849 list_for_each_entry(vlan, &port->vlans, list) 1850 netif_stacked_transfer_operstate(vlan->lowerdev, 1851 vlan->dev); 1852 break; 1853 case NETDEV_FEAT_CHANGE: 1854 list_for_each_entry(vlan, &port->vlans, list) { 1855 netif_inherit_tso_max(vlan->dev, dev); 1856 netdev_update_features(vlan->dev); 1857 } 1858 break; 1859 case NETDEV_CHANGEMTU: 1860 list_for_each_entry(vlan, &port->vlans, list) { 1861 if (vlan->dev->mtu <= dev->mtu) 1862 continue; 1863 dev_set_mtu(vlan->dev, dev->mtu); 1864 } 1865 break; 1866 case NETDEV_CHANGEADDR: 1867 if (!macvlan_passthru(port)) 1868 return NOTIFY_DONE; 1869 1870 vlan = list_first_entry_or_null(&port->vlans, 1871 struct macvlan_dev, 1872 list); 1873 1874 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr)) 1875 return NOTIFY_BAD; 1876 1877 break; 1878 case NETDEV_UNREGISTER: 1879 /* twiddle thumbs on netns device moves */ 1880 if (dev->reg_state != NETREG_UNREGISTERING) 1881 break; 1882 1883 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1884 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1885 unregister_netdevice_many(&list_kill); 1886 break; 1887 case NETDEV_PRE_TYPE_CHANGE: 1888 /* Forbid underlying device to change its type. */ 1889 return NOTIFY_BAD; 1890 1891 case NETDEV_NOTIFY_PEERS: 1892 case NETDEV_BONDING_FAILOVER: 1893 case NETDEV_RESEND_IGMP: 1894 /* Propagate to all vlans */ 1895 list_for_each_entry(vlan, &port->vlans, list) 1896 call_netdevice_notifiers(event, vlan->dev); 1897 } 1898 return NOTIFY_DONE; 1899 } 1900 1901 static struct notifier_block macvlan_notifier_block __read_mostly = { 1902 .notifier_call = macvlan_device_event, 1903 }; 1904 1905 static int __init macvlan_init_module(void) 1906 { 1907 int err; 1908 1909 register_netdevice_notifier(&macvlan_notifier_block); 1910 1911 err = macvlan_link_register(&macvlan_link_ops); 1912 if (err < 0) 1913 goto err1; 1914 return 0; 1915 err1: 1916 unregister_netdevice_notifier(&macvlan_notifier_block); 1917 return err; 1918 } 1919 1920 static void __exit macvlan_cleanup_module(void) 1921 { 1922 rtnl_link_unregister(&macvlan_link_ops); 1923 unregister_netdevice_notifier(&macvlan_notifier_block); 1924 } 1925 1926 module_init(macvlan_init_module); 1927 module_exit(macvlan_cleanup_module); 1928 1929 MODULE_LICENSE("GPL"); 1930 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1931 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1932 MODULE_ALIAS_RTNL_LINK("macvlan"); 1933