1 /* 2 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 of 7 * the License, or (at your option) any later version. 8 * 9 * The code this is based on carried the following copyright notice: 10 * --- 11 * (C) Copyright 2001-2006 12 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com 13 * Re-worked by Ben Greear <greearb@candelatech.com> 14 * --- 15 */ 16 #include <linux/kernel.h> 17 #include <linux/types.h> 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/errno.h> 21 #include <linux/slab.h> 22 #include <linux/string.h> 23 #include <linux/rculist.h> 24 #include <linux/notifier.h> 25 #include <linux/netdevice.h> 26 #include <linux/etherdevice.h> 27 #include <linux/ethtool.h> 28 #include <linux/if_arp.h> 29 #include <linux/if_vlan.h> 30 #include <linux/if_link.h> 31 #include <linux/if_macvlan.h> 32 #include <linux/hash.h> 33 #include <linux/workqueue.h> 34 #include <net/rtnetlink.h> 35 #include <net/xfrm.h> 36 #include <linux/netpoll.h> 37 38 #define MACVLAN_HASH_BITS 8 39 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS) 40 #define MACVLAN_BC_QUEUE_LEN 1000 41 42 struct macvlan_port { 43 struct net_device *dev; 44 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 45 struct list_head vlans; 46 struct rcu_head rcu; 47 struct sk_buff_head bc_queue; 48 struct work_struct bc_work; 49 bool passthru; 50 int count; 51 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE]; 52 }; 53 54 struct macvlan_source_entry { 55 struct hlist_node hlist; 56 struct macvlan_dev *vlan; 57 unsigned char addr[6+2] __aligned(sizeof(u16)); 58 struct rcu_head rcu; 59 }; 60 61 struct macvlan_skb_cb { 62 const struct macvlan_dev *src; 63 }; 64 65 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 66 67 static void macvlan_port_destroy(struct net_device *dev); 68 69 /* Hash Ethernet address */ 70 static u32 macvlan_eth_hash(const unsigned char *addr) 71 { 72 u64 value = get_unaligned((u64 *)addr); 73 74 /* only want 6 bytes */ 75 #ifdef __BIG_ENDIAN 76 value >>= 16; 77 #else 78 value <<= 16; 79 #endif 80 return hash_64(value, MACVLAN_HASH_BITS); 81 } 82 83 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 84 { 85 return rcu_dereference(dev->rx_handler_data); 86 } 87 88 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 89 { 90 return rtnl_dereference(dev->rx_handler_data); 91 } 92 93 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 94 95 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 96 const unsigned char *addr) 97 { 98 struct macvlan_dev *vlan; 99 u32 idx = macvlan_eth_hash(addr); 100 101 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) { 102 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 103 return vlan; 104 } 105 return NULL; 106 } 107 108 static struct macvlan_source_entry *macvlan_hash_lookup_source( 109 const struct macvlan_dev *vlan, 110 const unsigned char *addr) 111 { 112 struct macvlan_source_entry *entry; 113 u32 idx = macvlan_eth_hash(addr); 114 struct hlist_head *h = &vlan->port->vlan_source_hash[idx]; 115 116 hlist_for_each_entry_rcu(entry, h, hlist) { 117 if (ether_addr_equal_64bits(entry->addr, addr) && 118 entry->vlan == vlan) 119 return entry; 120 } 121 return NULL; 122 } 123 124 static int macvlan_hash_add_source(struct macvlan_dev *vlan, 125 const unsigned char *addr) 126 { 127 struct macvlan_port *port = vlan->port; 128 struct macvlan_source_entry *entry; 129 struct hlist_head *h; 130 131 entry = macvlan_hash_lookup_source(vlan, addr); 132 if (entry) 133 return 0; 134 135 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 136 if (!entry) 137 return -ENOMEM; 138 139 ether_addr_copy(entry->addr, addr); 140 entry->vlan = vlan; 141 h = &port->vlan_source_hash[macvlan_eth_hash(addr)]; 142 hlist_add_head_rcu(&entry->hlist, h); 143 vlan->macaddr_count++; 144 145 return 0; 146 } 147 148 static void macvlan_hash_add(struct macvlan_dev *vlan) 149 { 150 struct macvlan_port *port = vlan->port; 151 const unsigned char *addr = vlan->dev->dev_addr; 152 u32 idx = macvlan_eth_hash(addr); 153 154 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]); 155 } 156 157 static void macvlan_hash_del_source(struct macvlan_source_entry *entry) 158 { 159 hlist_del_rcu(&entry->hlist); 160 kfree_rcu(entry, rcu); 161 } 162 163 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 164 { 165 hlist_del_rcu(&vlan->hlist); 166 if (sync) 167 synchronize_rcu(); 168 } 169 170 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 171 const unsigned char *addr) 172 { 173 macvlan_hash_del(vlan, true); 174 /* Now that we are unhashed it is safe to change the device 175 * address without confusing packet delivery. 176 */ 177 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 178 macvlan_hash_add(vlan); 179 } 180 181 static int macvlan_addr_busy(const struct macvlan_port *port, 182 const unsigned char *addr) 183 { 184 /* Test to see if the specified multicast address is 185 * currently in use by the underlying device or 186 * another macvlan. 187 */ 188 if (ether_addr_equal_64bits(port->dev->dev_addr, addr)) 189 return 1; 190 191 if (macvlan_hash_lookup(port, addr)) 192 return 1; 193 194 return 0; 195 } 196 197 198 static int macvlan_broadcast_one(struct sk_buff *skb, 199 const struct macvlan_dev *vlan, 200 const struct ethhdr *eth, bool local) 201 { 202 struct net_device *dev = vlan->dev; 203 204 if (local) 205 return __dev_forward_skb(dev, skb); 206 207 skb->dev = dev; 208 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 209 skb->pkt_type = PACKET_BROADCAST; 210 else 211 skb->pkt_type = PACKET_MULTICAST; 212 213 return 0; 214 } 215 216 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 217 { 218 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 219 } 220 221 222 static unsigned int mc_hash(const struct macvlan_dev *vlan, 223 const unsigned char *addr) 224 { 225 u32 val = __get_unaligned_cpu32(addr + 2); 226 227 val ^= macvlan_hash_mix(vlan); 228 return hash_32(val, MACVLAN_MC_FILTER_BITS); 229 } 230 231 static void macvlan_broadcast(struct sk_buff *skb, 232 const struct macvlan_port *port, 233 struct net_device *src, 234 enum macvlan_mode mode) 235 { 236 const struct ethhdr *eth = eth_hdr(skb); 237 const struct macvlan_dev *vlan; 238 struct sk_buff *nskb; 239 unsigned int i; 240 int err; 241 unsigned int hash; 242 243 if (skb->protocol == htons(ETH_P_PAUSE)) 244 return; 245 246 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 247 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 248 if (vlan->dev == src || !(vlan->mode & mode)) 249 continue; 250 251 hash = mc_hash(vlan, eth->h_dest); 252 if (!test_bit(hash, vlan->mc_filter)) 253 continue; 254 255 err = NET_RX_DROP; 256 nskb = skb_clone(skb, GFP_ATOMIC); 257 if (likely(nskb)) 258 err = macvlan_broadcast_one( 259 nskb, vlan, eth, 260 mode == MACVLAN_MODE_BRIDGE) ?: 261 netif_rx_ni(nskb); 262 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 263 err == NET_RX_SUCCESS, 1); 264 } 265 } 266 } 267 268 static void macvlan_process_broadcast(struct work_struct *w) 269 { 270 struct macvlan_port *port = container_of(w, struct macvlan_port, 271 bc_work); 272 struct sk_buff *skb; 273 struct sk_buff_head list; 274 275 skb_queue_head_init(&list); 276 277 spin_lock_bh(&port->bc_queue.lock); 278 skb_queue_splice_tail_init(&port->bc_queue, &list); 279 spin_unlock_bh(&port->bc_queue.lock); 280 281 while ((skb = __skb_dequeue(&list))) { 282 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 283 284 rcu_read_lock(); 285 286 if (!src) 287 /* frame comes from an external address */ 288 macvlan_broadcast(skb, port, NULL, 289 MACVLAN_MODE_PRIVATE | 290 MACVLAN_MODE_VEPA | 291 MACVLAN_MODE_PASSTHRU| 292 MACVLAN_MODE_BRIDGE); 293 else if (src->mode == MACVLAN_MODE_VEPA) 294 /* flood to everyone except source */ 295 macvlan_broadcast(skb, port, src->dev, 296 MACVLAN_MODE_VEPA | 297 MACVLAN_MODE_BRIDGE); 298 else 299 /* 300 * flood only to VEPA ports, bridge ports 301 * already saw the frame on the way out. 302 */ 303 macvlan_broadcast(skb, port, src->dev, 304 MACVLAN_MODE_VEPA); 305 306 rcu_read_unlock(); 307 308 kfree_skb(skb); 309 } 310 } 311 312 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 313 struct sk_buff *skb) 314 { 315 struct sk_buff *nskb; 316 int err = -ENOMEM; 317 318 nskb = skb_clone(skb, GFP_ATOMIC); 319 if (!nskb) 320 goto err; 321 322 spin_lock(&port->bc_queue.lock); 323 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) { 324 __skb_queue_tail(&port->bc_queue, nskb); 325 err = 0; 326 } 327 spin_unlock(&port->bc_queue.lock); 328 329 if (err) 330 goto free_nskb; 331 332 schedule_work(&port->bc_work); 333 return; 334 335 free_nskb: 336 kfree_skb(nskb); 337 err: 338 atomic_long_inc(&skb->dev->rx_dropped); 339 } 340 341 static void macvlan_flush_sources(struct macvlan_port *port, 342 struct macvlan_dev *vlan) 343 { 344 int i; 345 346 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 347 struct hlist_node *h, *n; 348 349 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) { 350 struct macvlan_source_entry *entry; 351 352 entry = hlist_entry(h, struct macvlan_source_entry, 353 hlist); 354 if (entry->vlan == vlan) 355 macvlan_hash_del_source(entry); 356 } 357 } 358 vlan->macaddr_count = 0; 359 } 360 361 static void macvlan_forward_source_one(struct sk_buff *skb, 362 struct macvlan_dev *vlan) 363 { 364 struct sk_buff *nskb; 365 struct net_device *dev; 366 int len; 367 int ret; 368 369 dev = vlan->dev; 370 if (unlikely(!(dev->flags & IFF_UP))) 371 return; 372 373 nskb = skb_clone(skb, GFP_ATOMIC); 374 if (!nskb) 375 return; 376 377 len = nskb->len + ETH_HLEN; 378 nskb->dev = dev; 379 nskb->pkt_type = PACKET_HOST; 380 381 ret = netif_rx(nskb); 382 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); 383 } 384 385 static void macvlan_forward_source(struct sk_buff *skb, 386 struct macvlan_port *port, 387 const unsigned char *addr) 388 { 389 struct macvlan_source_entry *entry; 390 u32 idx = macvlan_eth_hash(addr); 391 struct hlist_head *h = &port->vlan_source_hash[idx]; 392 393 hlist_for_each_entry_rcu(entry, h, hlist) { 394 if (ether_addr_equal_64bits(entry->addr, addr)) 395 if (entry->vlan->dev->flags & IFF_UP) 396 macvlan_forward_source_one(skb, entry->vlan); 397 } 398 } 399 400 /* called under rcu_read_lock() from netif_receive_skb */ 401 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 402 { 403 struct macvlan_port *port; 404 struct sk_buff *skb = *pskb; 405 const struct ethhdr *eth = eth_hdr(skb); 406 const struct macvlan_dev *vlan; 407 const struct macvlan_dev *src; 408 struct net_device *dev; 409 unsigned int len = 0; 410 int ret = NET_RX_DROP; 411 412 port = macvlan_port_get_rcu(skb->dev); 413 if (is_multicast_ether_addr(eth->h_dest)) { 414 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN); 415 if (!skb) 416 return RX_HANDLER_CONSUMED; 417 eth = eth_hdr(skb); 418 macvlan_forward_source(skb, port, eth->h_source); 419 src = macvlan_hash_lookup(port, eth->h_source); 420 if (src && src->mode != MACVLAN_MODE_VEPA && 421 src->mode != MACVLAN_MODE_BRIDGE) { 422 /* forward to original port. */ 423 vlan = src; 424 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 425 netif_rx(skb); 426 goto out; 427 } 428 429 MACVLAN_SKB_CB(skb)->src = src; 430 macvlan_broadcast_enqueue(port, skb); 431 432 return RX_HANDLER_PASS; 433 } 434 435 macvlan_forward_source(skb, port, eth->h_source); 436 if (port->passthru) 437 vlan = list_first_or_null_rcu(&port->vlans, 438 struct macvlan_dev, list); 439 else 440 vlan = macvlan_hash_lookup(port, eth->h_dest); 441 if (vlan == NULL) 442 return RX_HANDLER_PASS; 443 444 dev = vlan->dev; 445 if (unlikely(!(dev->flags & IFF_UP))) { 446 kfree_skb(skb); 447 return RX_HANDLER_CONSUMED; 448 } 449 len = skb->len + ETH_HLEN; 450 skb = skb_share_check(skb, GFP_ATOMIC); 451 if (!skb) 452 goto out; 453 454 skb->dev = dev; 455 skb->pkt_type = PACKET_HOST; 456 457 ret = netif_rx(skb); 458 459 out: 460 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); 461 return RX_HANDLER_CONSUMED; 462 } 463 464 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 465 { 466 const struct macvlan_dev *vlan = netdev_priv(dev); 467 const struct macvlan_port *port = vlan->port; 468 const struct macvlan_dev *dest; 469 470 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 471 const struct ethhdr *eth = (void *)skb->data; 472 473 /* send to other bridge ports directly */ 474 if (is_multicast_ether_addr(eth->h_dest)) { 475 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 476 goto xmit_world; 477 } 478 479 dest = macvlan_hash_lookup(port, eth->h_dest); 480 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 481 /* send to lowerdev first for its network taps */ 482 dev_forward_skb(vlan->lowerdev, skb); 483 484 return NET_XMIT_SUCCESS; 485 } 486 } 487 488 xmit_world: 489 skb->dev = vlan->lowerdev; 490 return dev_queue_xmit(skb); 491 } 492 493 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 494 { 495 #ifdef CONFIG_NET_POLL_CONTROLLER 496 if (vlan->netpoll) 497 netpoll_send_skb(vlan->netpoll, skb); 498 #else 499 BUG(); 500 #endif 501 return NETDEV_TX_OK; 502 } 503 504 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 505 struct net_device *dev) 506 { 507 unsigned int len = skb->len; 508 int ret; 509 struct macvlan_dev *vlan = netdev_priv(dev); 510 511 if (unlikely(netpoll_tx_running(dev))) 512 return macvlan_netpoll_send_skb(vlan, skb); 513 514 if (vlan->fwd_priv) { 515 skb->dev = vlan->lowerdev; 516 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); 517 } else { 518 ret = macvlan_queue_xmit(skb, dev); 519 } 520 521 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 522 struct vlan_pcpu_stats *pcpu_stats; 523 524 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 525 u64_stats_update_begin(&pcpu_stats->syncp); 526 pcpu_stats->tx_packets++; 527 pcpu_stats->tx_bytes += len; 528 u64_stats_update_end(&pcpu_stats->syncp); 529 } else { 530 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 531 } 532 return ret; 533 } 534 535 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 536 unsigned short type, const void *daddr, 537 const void *saddr, unsigned len) 538 { 539 const struct macvlan_dev *vlan = netdev_priv(dev); 540 struct net_device *lowerdev = vlan->lowerdev; 541 542 return dev_hard_header(skb, lowerdev, type, daddr, 543 saddr ? : dev->dev_addr, len); 544 } 545 546 static const struct header_ops macvlan_hard_header_ops = { 547 .create = macvlan_hard_header, 548 .rebuild = eth_rebuild_header, 549 .parse = eth_header_parse, 550 .cache = eth_header_cache, 551 .cache_update = eth_header_cache_update, 552 }; 553 554 static struct rtnl_link_ops macvlan_link_ops; 555 556 static int macvlan_open(struct net_device *dev) 557 { 558 struct macvlan_dev *vlan = netdev_priv(dev); 559 struct net_device *lowerdev = vlan->lowerdev; 560 int err; 561 562 if (vlan->port->passthru) { 563 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 564 err = dev_set_promiscuity(lowerdev, 1); 565 if (err < 0) 566 goto out; 567 } 568 goto hash_add; 569 } 570 571 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && 572 dev->rtnl_link_ops == &macvlan_link_ops) { 573 vlan->fwd_priv = 574 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 575 576 /* If we get a NULL pointer back, or if we get an error 577 * then we should just fall through to the non accelerated path 578 */ 579 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 580 vlan->fwd_priv = NULL; 581 } else 582 return 0; 583 } 584 585 err = -EBUSY; 586 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 587 goto out; 588 589 err = dev_uc_add(lowerdev, dev->dev_addr); 590 if (err < 0) 591 goto out; 592 if (dev->flags & IFF_ALLMULTI) { 593 err = dev_set_allmulti(lowerdev, 1); 594 if (err < 0) 595 goto del_unicast; 596 } 597 598 hash_add: 599 macvlan_hash_add(vlan); 600 return 0; 601 602 del_unicast: 603 dev_uc_del(lowerdev, dev->dev_addr); 604 out: 605 if (vlan->fwd_priv) { 606 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 607 vlan->fwd_priv); 608 vlan->fwd_priv = NULL; 609 } 610 return err; 611 } 612 613 static int macvlan_stop(struct net_device *dev) 614 { 615 struct macvlan_dev *vlan = netdev_priv(dev); 616 struct net_device *lowerdev = vlan->lowerdev; 617 618 if (vlan->fwd_priv) { 619 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 620 vlan->fwd_priv); 621 vlan->fwd_priv = NULL; 622 return 0; 623 } 624 625 dev_uc_unsync(lowerdev, dev); 626 dev_mc_unsync(lowerdev, dev); 627 628 if (vlan->port->passthru) { 629 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 630 dev_set_promiscuity(lowerdev, -1); 631 goto hash_del; 632 } 633 634 if (dev->flags & IFF_ALLMULTI) 635 dev_set_allmulti(lowerdev, -1); 636 637 dev_uc_del(lowerdev, dev->dev_addr); 638 639 hash_del: 640 macvlan_hash_del(vlan, !dev->dismantle); 641 return 0; 642 } 643 644 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 645 { 646 struct macvlan_dev *vlan = netdev_priv(dev); 647 struct net_device *lowerdev = vlan->lowerdev; 648 int err; 649 650 if (!(dev->flags & IFF_UP)) { 651 /* Just copy in the new address */ 652 ether_addr_copy(dev->dev_addr, addr); 653 } else { 654 /* Rehash and update the device filters */ 655 if (macvlan_addr_busy(vlan->port, addr)) 656 return -EBUSY; 657 658 if (!vlan->port->passthru) { 659 err = dev_uc_add(lowerdev, addr); 660 if (err) 661 return err; 662 663 dev_uc_del(lowerdev, dev->dev_addr); 664 } 665 666 macvlan_hash_change_addr(vlan, addr); 667 } 668 return 0; 669 } 670 671 static int macvlan_set_mac_address(struct net_device *dev, void *p) 672 { 673 struct macvlan_dev *vlan = netdev_priv(dev); 674 struct sockaddr *addr = p; 675 676 if (!is_valid_ether_addr(addr->sa_data)) 677 return -EADDRNOTAVAIL; 678 679 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 680 dev_set_mac_address(vlan->lowerdev, addr); 681 return 0; 682 } 683 684 return macvlan_sync_address(dev, addr->sa_data); 685 } 686 687 static void macvlan_change_rx_flags(struct net_device *dev, int change) 688 { 689 struct macvlan_dev *vlan = netdev_priv(dev); 690 struct net_device *lowerdev = vlan->lowerdev; 691 692 if (dev->flags & IFF_UP) { 693 if (change & IFF_ALLMULTI) 694 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 695 } 696 } 697 698 static void macvlan_set_mac_lists(struct net_device *dev) 699 { 700 struct macvlan_dev *vlan = netdev_priv(dev); 701 702 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 703 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); 704 } else { 705 struct netdev_hw_addr *ha; 706 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 707 708 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 709 netdev_for_each_mc_addr(ha, dev) { 710 __set_bit(mc_hash(vlan, ha->addr), filter); 711 } 712 713 __set_bit(mc_hash(vlan, dev->broadcast), filter); 714 715 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); 716 } 717 dev_uc_sync(vlan->lowerdev, dev); 718 dev_mc_sync(vlan->lowerdev, dev); 719 } 720 721 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 722 { 723 struct macvlan_dev *vlan = netdev_priv(dev); 724 725 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 726 return -EINVAL; 727 dev->mtu = new_mtu; 728 return 0; 729 } 730 731 /* 732 * macvlan network devices have devices nesting below it and are a special 733 * "super class" of normal network devices; split their locks off into a 734 * separate class since they always nest. 735 */ 736 static struct lock_class_key macvlan_netdev_xmit_lock_key; 737 static struct lock_class_key macvlan_netdev_addr_lock_key; 738 739 #define ALWAYS_ON_FEATURES \ 740 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX) 741 742 #define MACVLAN_FEATURES \ 743 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 744 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 745 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 746 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 747 748 #define MACVLAN_STATE_MASK \ 749 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 750 751 static int macvlan_get_nest_level(struct net_device *dev) 752 { 753 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 754 } 755 756 static void macvlan_set_lockdep_class_one(struct net_device *dev, 757 struct netdev_queue *txq, 758 void *_unused) 759 { 760 lockdep_set_class(&txq->_xmit_lock, 761 &macvlan_netdev_xmit_lock_key); 762 } 763 764 static void macvlan_set_lockdep_class(struct net_device *dev) 765 { 766 lockdep_set_class_and_subclass(&dev->addr_list_lock, 767 &macvlan_netdev_addr_lock_key, 768 macvlan_get_nest_level(dev)); 769 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 770 } 771 772 static int macvlan_init(struct net_device *dev) 773 { 774 struct macvlan_dev *vlan = netdev_priv(dev); 775 const struct net_device *lowerdev = vlan->lowerdev; 776 777 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 778 (lowerdev->state & MACVLAN_STATE_MASK); 779 dev->features = lowerdev->features & MACVLAN_FEATURES; 780 dev->features |= ALWAYS_ON_FEATURES; 781 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 782 dev->gso_max_size = lowerdev->gso_max_size; 783 dev->iflink = lowerdev->ifindex; 784 dev->hard_header_len = lowerdev->hard_header_len; 785 786 macvlan_set_lockdep_class(dev); 787 788 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 789 if (!vlan->pcpu_stats) 790 return -ENOMEM; 791 792 return 0; 793 } 794 795 static void macvlan_uninit(struct net_device *dev) 796 { 797 struct macvlan_dev *vlan = netdev_priv(dev); 798 struct macvlan_port *port = vlan->port; 799 800 free_percpu(vlan->pcpu_stats); 801 802 macvlan_flush_sources(port, vlan); 803 port->count -= 1; 804 if (!port->count) 805 macvlan_port_destroy(port->dev); 806 } 807 808 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 809 struct rtnl_link_stats64 *stats) 810 { 811 struct macvlan_dev *vlan = netdev_priv(dev); 812 813 if (vlan->pcpu_stats) { 814 struct vlan_pcpu_stats *p; 815 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 816 u32 rx_errors = 0, tx_dropped = 0; 817 unsigned int start; 818 int i; 819 820 for_each_possible_cpu(i) { 821 p = per_cpu_ptr(vlan->pcpu_stats, i); 822 do { 823 start = u64_stats_fetch_begin_irq(&p->syncp); 824 rx_packets = p->rx_packets; 825 rx_bytes = p->rx_bytes; 826 rx_multicast = p->rx_multicast; 827 tx_packets = p->tx_packets; 828 tx_bytes = p->tx_bytes; 829 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 830 831 stats->rx_packets += rx_packets; 832 stats->rx_bytes += rx_bytes; 833 stats->multicast += rx_multicast; 834 stats->tx_packets += tx_packets; 835 stats->tx_bytes += tx_bytes; 836 /* rx_errors & tx_dropped are u32, updated 837 * without syncp protection. 838 */ 839 rx_errors += p->rx_errors; 840 tx_dropped += p->tx_dropped; 841 } 842 stats->rx_errors = rx_errors; 843 stats->rx_dropped = rx_errors; 844 stats->tx_dropped = tx_dropped; 845 } 846 return stats; 847 } 848 849 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 850 __be16 proto, u16 vid) 851 { 852 struct macvlan_dev *vlan = netdev_priv(dev); 853 struct net_device *lowerdev = vlan->lowerdev; 854 855 return vlan_vid_add(lowerdev, proto, vid); 856 } 857 858 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 859 __be16 proto, u16 vid) 860 { 861 struct macvlan_dev *vlan = netdev_priv(dev); 862 struct net_device *lowerdev = vlan->lowerdev; 863 864 vlan_vid_del(lowerdev, proto, vid); 865 return 0; 866 } 867 868 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 869 struct net_device *dev, 870 const unsigned char *addr, 871 u16 flags) 872 { 873 struct macvlan_dev *vlan = netdev_priv(dev); 874 int err = -EINVAL; 875 876 /* Support unicast filter only on passthru devices. 877 * Multicast filter should be allowed on all devices. 878 */ 879 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 880 return -EOPNOTSUPP; 881 882 if (flags & NLM_F_REPLACE) 883 return -EOPNOTSUPP; 884 885 if (is_unicast_ether_addr(addr)) 886 err = dev_uc_add_excl(dev, addr); 887 else if (is_multicast_ether_addr(addr)) 888 err = dev_mc_add_excl(dev, addr); 889 890 return err; 891 } 892 893 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 894 struct net_device *dev, 895 const unsigned char *addr) 896 { 897 struct macvlan_dev *vlan = netdev_priv(dev); 898 int err = -EINVAL; 899 900 /* Support unicast filter only on passthru devices. 901 * Multicast filter should be allowed on all devices. 902 */ 903 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 904 return -EOPNOTSUPP; 905 906 if (is_unicast_ether_addr(addr)) 907 err = dev_uc_del(dev, addr); 908 else if (is_multicast_ether_addr(addr)) 909 err = dev_mc_del(dev, addr); 910 911 return err; 912 } 913 914 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 915 struct ethtool_drvinfo *drvinfo) 916 { 917 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 918 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 919 } 920 921 static int macvlan_ethtool_get_settings(struct net_device *dev, 922 struct ethtool_cmd *cmd) 923 { 924 const struct macvlan_dev *vlan = netdev_priv(dev); 925 926 return __ethtool_get_settings(vlan->lowerdev, cmd); 927 } 928 929 static netdev_features_t macvlan_fix_features(struct net_device *dev, 930 netdev_features_t features) 931 { 932 struct macvlan_dev *vlan = netdev_priv(dev); 933 netdev_features_t mask; 934 935 features |= NETIF_F_ALL_FOR_ALL; 936 features &= (vlan->set_features | ~MACVLAN_FEATURES); 937 mask = features; 938 939 features = netdev_increment_features(vlan->lowerdev->features, 940 features, 941 mask); 942 features |= ALWAYS_ON_FEATURES; 943 features &= ~NETIF_F_NETNS_LOCAL; 944 945 return features; 946 } 947 948 #ifdef CONFIG_NET_POLL_CONTROLLER 949 static void macvlan_dev_poll_controller(struct net_device *dev) 950 { 951 return; 952 } 953 954 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 955 { 956 struct macvlan_dev *vlan = netdev_priv(dev); 957 struct net_device *real_dev = vlan->lowerdev; 958 struct netpoll *netpoll; 959 int err = 0; 960 961 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 962 err = -ENOMEM; 963 if (!netpoll) 964 goto out; 965 966 err = __netpoll_setup(netpoll, real_dev); 967 if (err) { 968 kfree(netpoll); 969 goto out; 970 } 971 972 vlan->netpoll = netpoll; 973 974 out: 975 return err; 976 } 977 978 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 979 { 980 struct macvlan_dev *vlan = netdev_priv(dev); 981 struct netpoll *netpoll = vlan->netpoll; 982 983 if (!netpoll) 984 return; 985 986 vlan->netpoll = NULL; 987 988 __netpoll_free_async(netpoll); 989 } 990 #endif /* CONFIG_NET_POLL_CONTROLLER */ 991 992 static const struct ethtool_ops macvlan_ethtool_ops = { 993 .get_link = ethtool_op_get_link, 994 .get_settings = macvlan_ethtool_get_settings, 995 .get_drvinfo = macvlan_ethtool_get_drvinfo, 996 }; 997 998 static const struct net_device_ops macvlan_netdev_ops = { 999 .ndo_init = macvlan_init, 1000 .ndo_uninit = macvlan_uninit, 1001 .ndo_open = macvlan_open, 1002 .ndo_stop = macvlan_stop, 1003 .ndo_start_xmit = macvlan_start_xmit, 1004 .ndo_change_mtu = macvlan_change_mtu, 1005 .ndo_fix_features = macvlan_fix_features, 1006 .ndo_change_rx_flags = macvlan_change_rx_flags, 1007 .ndo_set_mac_address = macvlan_set_mac_address, 1008 .ndo_set_rx_mode = macvlan_set_mac_lists, 1009 .ndo_get_stats64 = macvlan_dev_get_stats64, 1010 .ndo_validate_addr = eth_validate_addr, 1011 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1012 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1013 .ndo_fdb_add = macvlan_fdb_add, 1014 .ndo_fdb_del = macvlan_fdb_del, 1015 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1016 .ndo_get_lock_subclass = macvlan_get_nest_level, 1017 #ifdef CONFIG_NET_POLL_CONTROLLER 1018 .ndo_poll_controller = macvlan_dev_poll_controller, 1019 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1020 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1021 #endif 1022 }; 1023 1024 void macvlan_common_setup(struct net_device *dev) 1025 { 1026 ether_setup(dev); 1027 1028 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1029 netif_keep_dst(dev); 1030 dev->priv_flags |= IFF_UNICAST_FLT; 1031 dev->netdev_ops = &macvlan_netdev_ops; 1032 dev->destructor = free_netdev; 1033 dev->header_ops = &macvlan_hard_header_ops; 1034 dev->ethtool_ops = &macvlan_ethtool_ops; 1035 } 1036 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1037 1038 static void macvlan_setup(struct net_device *dev) 1039 { 1040 macvlan_common_setup(dev); 1041 dev->tx_queue_len = 0; 1042 } 1043 1044 static int macvlan_port_create(struct net_device *dev) 1045 { 1046 struct macvlan_port *port; 1047 unsigned int i; 1048 int err; 1049 1050 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1051 return -EINVAL; 1052 1053 port = kzalloc(sizeof(*port), GFP_KERNEL); 1054 if (port == NULL) 1055 return -ENOMEM; 1056 1057 port->passthru = false; 1058 port->dev = dev; 1059 INIT_LIST_HEAD(&port->vlans); 1060 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1061 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1062 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1063 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1064 1065 skb_queue_head_init(&port->bc_queue); 1066 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1067 1068 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1069 if (err) 1070 kfree(port); 1071 else 1072 dev->priv_flags |= IFF_MACVLAN_PORT; 1073 return err; 1074 } 1075 1076 static void macvlan_port_destroy(struct net_device *dev) 1077 { 1078 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1079 1080 cancel_work_sync(&port->bc_work); 1081 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1082 netdev_rx_handler_unregister(dev); 1083 kfree_rcu(port, rcu); 1084 } 1085 1086 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 1087 { 1088 if (tb[IFLA_ADDRESS]) { 1089 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1090 return -EINVAL; 1091 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1092 return -EADDRNOTAVAIL; 1093 } 1094 1095 if (data && data[IFLA_MACVLAN_FLAGS] && 1096 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1097 return -EINVAL; 1098 1099 if (data && data[IFLA_MACVLAN_MODE]) { 1100 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1101 case MACVLAN_MODE_PRIVATE: 1102 case MACVLAN_MODE_VEPA: 1103 case MACVLAN_MODE_BRIDGE: 1104 case MACVLAN_MODE_PASSTHRU: 1105 case MACVLAN_MODE_SOURCE: 1106 break; 1107 default: 1108 return -EINVAL; 1109 } 1110 } 1111 1112 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1113 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1114 case MACVLAN_MACADDR_ADD: 1115 case MACVLAN_MACADDR_DEL: 1116 case MACVLAN_MACADDR_FLUSH: 1117 case MACVLAN_MACADDR_SET: 1118 break; 1119 default: 1120 return -EINVAL; 1121 } 1122 } 1123 1124 if (data && data[IFLA_MACVLAN_MACADDR]) { 1125 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1126 return -EINVAL; 1127 1128 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1129 return -EADDRNOTAVAIL; 1130 } 1131 1132 if (data && data[IFLA_MACVLAN_MACADDR_COUNT]) 1133 return -EINVAL; 1134 1135 return 0; 1136 } 1137 1138 /** 1139 * reconfigure list of remote source mac address 1140 * (only for macvlan devices in source mode) 1141 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1142 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1143 */ 1144 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1145 struct nlattr *data[]) 1146 { 1147 char *addr = NULL; 1148 int ret, rem, len; 1149 struct nlattr *nla, *head; 1150 struct macvlan_source_entry *entry; 1151 1152 if (data[IFLA_MACVLAN_MACADDR]) 1153 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1154 1155 if (mode == MACVLAN_MACADDR_ADD) { 1156 if (!addr) 1157 return -EINVAL; 1158 1159 return macvlan_hash_add_source(vlan, addr); 1160 1161 } else if (mode == MACVLAN_MACADDR_DEL) { 1162 if (!addr) 1163 return -EINVAL; 1164 1165 entry = macvlan_hash_lookup_source(vlan, addr); 1166 if (entry) { 1167 macvlan_hash_del_source(entry); 1168 vlan->macaddr_count--; 1169 } 1170 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1171 macvlan_flush_sources(vlan->port, vlan); 1172 } else if (mode == MACVLAN_MACADDR_SET) { 1173 macvlan_flush_sources(vlan->port, vlan); 1174 1175 if (addr) { 1176 ret = macvlan_hash_add_source(vlan, addr); 1177 if (ret) 1178 return ret; 1179 } 1180 1181 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1182 return 0; 1183 1184 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1185 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1186 1187 nla_for_each_attr(nla, head, len, rem) { 1188 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1189 nla_len(nla) != ETH_ALEN) 1190 continue; 1191 1192 addr = nla_data(nla); 1193 ret = macvlan_hash_add_source(vlan, addr); 1194 if (ret) 1195 return ret; 1196 } 1197 } else { 1198 return -EINVAL; 1199 } 1200 1201 return 0; 1202 } 1203 1204 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1205 struct nlattr *tb[], struct nlattr *data[]) 1206 { 1207 struct macvlan_dev *vlan = netdev_priv(dev); 1208 struct macvlan_port *port; 1209 struct net_device *lowerdev; 1210 int err; 1211 int macmode; 1212 1213 if (!tb[IFLA_LINK]) 1214 return -EINVAL; 1215 1216 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1217 if (lowerdev == NULL) 1218 return -ENODEV; 1219 1220 /* When creating macvlans or macvtaps on top of other macvlans - use 1221 * the real device as the lowerdev. 1222 */ 1223 if (netif_is_macvlan(lowerdev)) 1224 lowerdev = macvlan_dev_real_dev(lowerdev); 1225 1226 if (!tb[IFLA_MTU]) 1227 dev->mtu = lowerdev->mtu; 1228 else if (dev->mtu > lowerdev->mtu) 1229 return -EINVAL; 1230 1231 if (!tb[IFLA_ADDRESS]) 1232 eth_hw_addr_random(dev); 1233 1234 if (!macvlan_port_exists(lowerdev)) { 1235 err = macvlan_port_create(lowerdev); 1236 if (err < 0) 1237 return err; 1238 } 1239 port = macvlan_port_get_rtnl(lowerdev); 1240 1241 /* Only 1 macvlan device can be created in passthru mode */ 1242 if (port->passthru) 1243 return -EINVAL; 1244 1245 vlan->lowerdev = lowerdev; 1246 vlan->dev = dev; 1247 vlan->port = port; 1248 vlan->set_features = MACVLAN_FEATURES; 1249 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1; 1250 1251 vlan->mode = MACVLAN_MODE_VEPA; 1252 if (data && data[IFLA_MACVLAN_MODE]) 1253 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1254 1255 if (data && data[IFLA_MACVLAN_FLAGS]) 1256 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1257 1258 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1259 if (port->count) 1260 return -EINVAL; 1261 port->passthru = true; 1262 eth_hw_addr_inherit(dev, lowerdev); 1263 } 1264 1265 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1266 if (vlan->mode != MACVLAN_MODE_SOURCE) 1267 return -EINVAL; 1268 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1269 err = macvlan_changelink_sources(vlan, macmode, data); 1270 if (err) 1271 return err; 1272 } 1273 1274 port->count += 1; 1275 err = register_netdevice(dev); 1276 if (err < 0) 1277 goto destroy_port; 1278 1279 dev->priv_flags |= IFF_MACVLAN; 1280 err = netdev_upper_dev_link(lowerdev, dev); 1281 if (err) 1282 goto unregister_netdev; 1283 1284 list_add_tail_rcu(&vlan->list, &port->vlans); 1285 netif_stacked_transfer_operstate(lowerdev, dev); 1286 1287 return 0; 1288 1289 unregister_netdev: 1290 unregister_netdevice(dev); 1291 destroy_port: 1292 port->count -= 1; 1293 if (!port->count) 1294 macvlan_port_destroy(lowerdev); 1295 1296 return err; 1297 } 1298 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1299 1300 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1301 struct nlattr *tb[], struct nlattr *data[]) 1302 { 1303 return macvlan_common_newlink(src_net, dev, tb, data); 1304 } 1305 1306 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1307 { 1308 struct macvlan_dev *vlan = netdev_priv(dev); 1309 1310 if (vlan->mode == MACVLAN_MODE_SOURCE) 1311 macvlan_flush_sources(vlan->port, vlan); 1312 list_del_rcu(&vlan->list); 1313 unregister_netdevice_queue(dev, head); 1314 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1315 } 1316 EXPORT_SYMBOL_GPL(macvlan_dellink); 1317 1318 static int macvlan_changelink(struct net_device *dev, 1319 struct nlattr *tb[], struct nlattr *data[]) 1320 { 1321 struct macvlan_dev *vlan = netdev_priv(dev); 1322 enum macvlan_mode mode; 1323 bool set_mode = false; 1324 enum macvlan_macaddr_mode macmode; 1325 int ret; 1326 1327 /* Validate mode, but don't set yet: setting flags may fail. */ 1328 if (data && data[IFLA_MACVLAN_MODE]) { 1329 set_mode = true; 1330 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1331 /* Passthrough mode can't be set or cleared dynamically */ 1332 if ((mode == MACVLAN_MODE_PASSTHRU) != 1333 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1334 return -EINVAL; 1335 if (vlan->mode == MACVLAN_MODE_SOURCE && 1336 vlan->mode != mode) 1337 macvlan_flush_sources(vlan->port, vlan); 1338 } 1339 1340 if (data && data[IFLA_MACVLAN_FLAGS]) { 1341 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1342 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1343 if (vlan->port->passthru && promisc) { 1344 int err; 1345 1346 if (flags & MACVLAN_FLAG_NOPROMISC) 1347 err = dev_set_promiscuity(vlan->lowerdev, -1); 1348 else 1349 err = dev_set_promiscuity(vlan->lowerdev, 1); 1350 if (err < 0) 1351 return err; 1352 } 1353 vlan->flags = flags; 1354 } 1355 if (set_mode) 1356 vlan->mode = mode; 1357 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1358 if (vlan->mode != MACVLAN_MODE_SOURCE) 1359 return -EINVAL; 1360 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1361 ret = macvlan_changelink_sources(vlan, macmode, data); 1362 if (ret) 1363 return ret; 1364 } 1365 return 0; 1366 } 1367 1368 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1369 { 1370 if (vlan->macaddr_count == 0) 1371 return 0; 1372 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1373 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1374 } 1375 1376 static size_t macvlan_get_size(const struct net_device *dev) 1377 { 1378 struct macvlan_dev *vlan = netdev_priv(dev); 1379 1380 return (0 1381 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1382 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1383 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1384 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1385 ); 1386 } 1387 1388 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1389 const struct macvlan_dev *vlan, 1390 const int i) 1391 { 1392 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1393 struct macvlan_source_entry *entry; 1394 1395 hlist_for_each_entry_rcu(entry, h, hlist) { 1396 if (entry->vlan != vlan) 1397 continue; 1398 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1399 return 1; 1400 } 1401 return 0; 1402 } 1403 1404 static int macvlan_fill_info(struct sk_buff *skb, 1405 const struct net_device *dev) 1406 { 1407 struct macvlan_dev *vlan = netdev_priv(dev); 1408 int i; 1409 struct nlattr *nest; 1410 1411 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1412 goto nla_put_failure; 1413 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1414 goto nla_put_failure; 1415 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1416 goto nla_put_failure; 1417 if (vlan->macaddr_count > 0) { 1418 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1419 if (nest == NULL) 1420 goto nla_put_failure; 1421 1422 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1423 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1424 goto nla_put_failure; 1425 } 1426 nla_nest_end(skb, nest); 1427 } 1428 return 0; 1429 1430 nla_put_failure: 1431 return -EMSGSIZE; 1432 } 1433 1434 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1435 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1436 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1437 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1438 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1439 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1440 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1441 }; 1442 1443 int macvlan_link_register(struct rtnl_link_ops *ops) 1444 { 1445 /* common fields */ 1446 ops->priv_size = sizeof(struct macvlan_dev); 1447 ops->validate = macvlan_validate; 1448 ops->maxtype = IFLA_MACVLAN_MAX; 1449 ops->policy = macvlan_policy; 1450 ops->changelink = macvlan_changelink; 1451 ops->get_size = macvlan_get_size; 1452 ops->fill_info = macvlan_fill_info; 1453 1454 return rtnl_link_register(ops); 1455 }; 1456 EXPORT_SYMBOL_GPL(macvlan_link_register); 1457 1458 static struct rtnl_link_ops macvlan_link_ops = { 1459 .kind = "macvlan", 1460 .setup = macvlan_setup, 1461 .newlink = macvlan_newlink, 1462 .dellink = macvlan_dellink, 1463 }; 1464 1465 static int macvlan_device_event(struct notifier_block *unused, 1466 unsigned long event, void *ptr) 1467 { 1468 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1469 struct macvlan_dev *vlan, *next; 1470 struct macvlan_port *port; 1471 LIST_HEAD(list_kill); 1472 1473 if (!macvlan_port_exists(dev)) 1474 return NOTIFY_DONE; 1475 1476 port = macvlan_port_get_rtnl(dev); 1477 1478 switch (event) { 1479 case NETDEV_CHANGE: 1480 list_for_each_entry(vlan, &port->vlans, list) 1481 netif_stacked_transfer_operstate(vlan->lowerdev, 1482 vlan->dev); 1483 break; 1484 case NETDEV_FEAT_CHANGE: 1485 list_for_each_entry(vlan, &port->vlans, list) { 1486 vlan->dev->gso_max_size = dev->gso_max_size; 1487 netdev_update_features(vlan->dev); 1488 } 1489 break; 1490 case NETDEV_CHANGEMTU: 1491 list_for_each_entry(vlan, &port->vlans, list) { 1492 if (vlan->dev->mtu <= dev->mtu) 1493 continue; 1494 dev_set_mtu(vlan->dev, dev->mtu); 1495 } 1496 break; 1497 case NETDEV_CHANGEADDR: 1498 if (!port->passthru) 1499 return NOTIFY_DONE; 1500 1501 vlan = list_first_entry_or_null(&port->vlans, 1502 struct macvlan_dev, 1503 list); 1504 1505 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1506 return NOTIFY_BAD; 1507 1508 break; 1509 case NETDEV_UNREGISTER: 1510 /* twiddle thumbs on netns device moves */ 1511 if (dev->reg_state != NETREG_UNREGISTERING) 1512 break; 1513 1514 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1515 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1516 unregister_netdevice_many(&list_kill); 1517 break; 1518 case NETDEV_PRE_TYPE_CHANGE: 1519 /* Forbid underlaying device to change its type. */ 1520 return NOTIFY_BAD; 1521 1522 case NETDEV_NOTIFY_PEERS: 1523 case NETDEV_BONDING_FAILOVER: 1524 case NETDEV_RESEND_IGMP: 1525 /* Propagate to all vlans */ 1526 list_for_each_entry(vlan, &port->vlans, list) 1527 call_netdevice_notifiers(event, vlan->dev); 1528 } 1529 return NOTIFY_DONE; 1530 } 1531 1532 static struct notifier_block macvlan_notifier_block __read_mostly = { 1533 .notifier_call = macvlan_device_event, 1534 }; 1535 1536 static int __init macvlan_init_module(void) 1537 { 1538 int err; 1539 1540 register_netdevice_notifier(&macvlan_notifier_block); 1541 1542 err = macvlan_link_register(&macvlan_link_ops); 1543 if (err < 0) 1544 goto err1; 1545 return 0; 1546 err1: 1547 unregister_netdevice_notifier(&macvlan_notifier_block); 1548 return err; 1549 } 1550 1551 static void __exit macvlan_cleanup_module(void) 1552 { 1553 rtnl_link_unregister(&macvlan_link_ops); 1554 unregister_netdevice_notifier(&macvlan_notifier_block); 1555 } 1556 1557 module_init(macvlan_init_module); 1558 module_exit(macvlan_cleanup_module); 1559 1560 MODULE_LICENSE("GPL"); 1561 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1562 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1563 MODULE_ALIAS_RTNL_LINK("macvlan"); 1564