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