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 sk_buff_head bc_queue; 47 struct work_struct bc_work; 48 bool passthru; 49 int count; 50 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE]; 51 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ); 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 bool 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 true; 190 191 if (macvlan_hash_lookup(port, addr)) 192 return true; 193 194 return false; 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, true); 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 if (src) 309 dev_put(src->dev); 310 kfree_skb(skb); 311 } 312 } 313 314 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 315 const struct macvlan_dev *src, 316 struct sk_buff *skb) 317 { 318 struct sk_buff *nskb; 319 int err = -ENOMEM; 320 321 nskb = skb_clone(skb, GFP_ATOMIC); 322 if (!nskb) 323 goto err; 324 325 MACVLAN_SKB_CB(nskb)->src = src; 326 327 spin_lock(&port->bc_queue.lock); 328 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) { 329 if (src) 330 dev_hold(src->dev); 331 __skb_queue_tail(&port->bc_queue, nskb); 332 err = 0; 333 } 334 spin_unlock(&port->bc_queue.lock); 335 336 if (err) 337 goto free_nskb; 338 339 schedule_work(&port->bc_work); 340 return; 341 342 free_nskb: 343 kfree_skb(nskb); 344 err: 345 atomic_long_inc(&skb->dev->rx_dropped); 346 } 347 348 static void macvlan_flush_sources(struct macvlan_port *port, 349 struct macvlan_dev *vlan) 350 { 351 int i; 352 353 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 354 struct hlist_node *h, *n; 355 356 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) { 357 struct macvlan_source_entry *entry; 358 359 entry = hlist_entry(h, struct macvlan_source_entry, 360 hlist); 361 if (entry->vlan == vlan) 362 macvlan_hash_del_source(entry); 363 } 364 } 365 vlan->macaddr_count = 0; 366 } 367 368 static void macvlan_forward_source_one(struct sk_buff *skb, 369 struct macvlan_dev *vlan) 370 { 371 struct sk_buff *nskb; 372 struct net_device *dev; 373 int len; 374 int ret; 375 376 dev = vlan->dev; 377 if (unlikely(!(dev->flags & IFF_UP))) 378 return; 379 380 nskb = skb_clone(skb, GFP_ATOMIC); 381 if (!nskb) 382 return; 383 384 len = nskb->len + ETH_HLEN; 385 nskb->dev = dev; 386 nskb->pkt_type = PACKET_HOST; 387 388 ret = netif_rx(nskb); 389 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 390 } 391 392 static void macvlan_forward_source(struct sk_buff *skb, 393 struct macvlan_port *port, 394 const unsigned char *addr) 395 { 396 struct macvlan_source_entry *entry; 397 u32 idx = macvlan_eth_hash(addr); 398 struct hlist_head *h = &port->vlan_source_hash[idx]; 399 400 hlist_for_each_entry_rcu(entry, h, hlist) { 401 if (ether_addr_equal_64bits(entry->addr, addr)) 402 macvlan_forward_source_one(skb, entry->vlan); 403 } 404 } 405 406 /* called under rcu_read_lock() from netif_receive_skb */ 407 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 408 { 409 struct macvlan_port *port; 410 struct sk_buff *skb = *pskb; 411 const struct ethhdr *eth = eth_hdr(skb); 412 const struct macvlan_dev *vlan; 413 const struct macvlan_dev *src; 414 struct net_device *dev; 415 unsigned int len = 0; 416 int ret; 417 rx_handler_result_t handle_res; 418 419 port = macvlan_port_get_rcu(skb->dev); 420 if (is_multicast_ether_addr(eth->h_dest)) { 421 unsigned int hash; 422 423 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); 424 if (!skb) 425 return RX_HANDLER_CONSUMED; 426 *pskb = skb; 427 eth = eth_hdr(skb); 428 macvlan_forward_source(skb, port, eth->h_source); 429 src = macvlan_hash_lookup(port, eth->h_source); 430 if (src && src->mode != MACVLAN_MODE_VEPA && 431 src->mode != MACVLAN_MODE_BRIDGE) { 432 /* forward to original port. */ 433 vlan = src; 434 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 435 netif_rx(skb); 436 handle_res = RX_HANDLER_CONSUMED; 437 goto out; 438 } 439 440 hash = mc_hash(NULL, eth->h_dest); 441 if (test_bit(hash, port->mc_filter)) 442 macvlan_broadcast_enqueue(port, src, skb); 443 444 return RX_HANDLER_PASS; 445 } 446 447 macvlan_forward_source(skb, port, eth->h_source); 448 if (port->passthru) 449 vlan = list_first_or_null_rcu(&port->vlans, 450 struct macvlan_dev, list); 451 else 452 vlan = macvlan_hash_lookup(port, eth->h_dest); 453 if (vlan == NULL) 454 return RX_HANDLER_PASS; 455 456 dev = vlan->dev; 457 if (unlikely(!(dev->flags & IFF_UP))) { 458 kfree_skb(skb); 459 return RX_HANDLER_CONSUMED; 460 } 461 len = skb->len + ETH_HLEN; 462 skb = skb_share_check(skb, GFP_ATOMIC); 463 if (!skb) { 464 ret = NET_RX_DROP; 465 handle_res = RX_HANDLER_CONSUMED; 466 goto out; 467 } 468 469 *pskb = skb; 470 skb->dev = dev; 471 skb->pkt_type = PACKET_HOST; 472 473 ret = NET_RX_SUCCESS; 474 handle_res = RX_HANDLER_ANOTHER; 475 out: 476 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 477 return handle_res; 478 } 479 480 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 481 { 482 const struct macvlan_dev *vlan = netdev_priv(dev); 483 const struct macvlan_port *port = vlan->port; 484 const struct macvlan_dev *dest; 485 486 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 487 const struct ethhdr *eth = (void *)skb->data; 488 489 /* send to other bridge ports directly */ 490 if (is_multicast_ether_addr(eth->h_dest)) { 491 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 492 goto xmit_world; 493 } 494 495 dest = macvlan_hash_lookup(port, eth->h_dest); 496 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 497 /* send to lowerdev first for its network taps */ 498 dev_forward_skb(vlan->lowerdev, skb); 499 500 return NET_XMIT_SUCCESS; 501 } 502 } 503 504 xmit_world: 505 skb->dev = vlan->lowerdev; 506 return dev_queue_xmit(skb); 507 } 508 509 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 510 { 511 #ifdef CONFIG_NET_POLL_CONTROLLER 512 if (vlan->netpoll) 513 netpoll_send_skb(vlan->netpoll, skb); 514 #else 515 BUG(); 516 #endif 517 return NETDEV_TX_OK; 518 } 519 520 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 521 struct net_device *dev) 522 { 523 unsigned int len = skb->len; 524 int ret; 525 struct macvlan_dev *vlan = netdev_priv(dev); 526 527 if (unlikely(netpoll_tx_running(dev))) 528 return macvlan_netpoll_send_skb(vlan, skb); 529 530 if (vlan->fwd_priv) { 531 skb->dev = vlan->lowerdev; 532 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); 533 } else { 534 ret = macvlan_queue_xmit(skb, dev); 535 } 536 537 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 538 struct vlan_pcpu_stats *pcpu_stats; 539 540 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 541 u64_stats_update_begin(&pcpu_stats->syncp); 542 pcpu_stats->tx_packets++; 543 pcpu_stats->tx_bytes += len; 544 u64_stats_update_end(&pcpu_stats->syncp); 545 } else { 546 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 547 } 548 return ret; 549 } 550 551 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 552 unsigned short type, const void *daddr, 553 const void *saddr, unsigned len) 554 { 555 const struct macvlan_dev *vlan = netdev_priv(dev); 556 struct net_device *lowerdev = vlan->lowerdev; 557 558 return dev_hard_header(skb, lowerdev, type, daddr, 559 saddr ? : dev->dev_addr, len); 560 } 561 562 static const struct header_ops macvlan_hard_header_ops = { 563 .create = macvlan_hard_header, 564 .parse = eth_header_parse, 565 .cache = eth_header_cache, 566 .cache_update = eth_header_cache_update, 567 }; 568 569 static struct rtnl_link_ops macvlan_link_ops; 570 571 static int macvlan_open(struct net_device *dev) 572 { 573 struct macvlan_dev *vlan = netdev_priv(dev); 574 struct net_device *lowerdev = vlan->lowerdev; 575 int err; 576 577 if (vlan->port->passthru) { 578 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 579 err = dev_set_promiscuity(lowerdev, 1); 580 if (err < 0) 581 goto out; 582 } 583 goto hash_add; 584 } 585 586 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && 587 dev->rtnl_link_ops == &macvlan_link_ops) { 588 vlan->fwd_priv = 589 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 590 591 /* If we get a NULL pointer back, or if we get an error 592 * then we should just fall through to the non accelerated path 593 */ 594 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 595 vlan->fwd_priv = NULL; 596 } else 597 return 0; 598 } 599 600 err = -EBUSY; 601 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 602 goto out; 603 604 err = dev_uc_add(lowerdev, dev->dev_addr); 605 if (err < 0) 606 goto out; 607 if (dev->flags & IFF_ALLMULTI) { 608 err = dev_set_allmulti(lowerdev, 1); 609 if (err < 0) 610 goto del_unicast; 611 } 612 613 if (dev->flags & IFF_PROMISC) { 614 err = dev_set_promiscuity(lowerdev, 1); 615 if (err < 0) 616 goto clear_multi; 617 } 618 619 hash_add: 620 macvlan_hash_add(vlan); 621 return 0; 622 623 clear_multi: 624 if (dev->flags & IFF_ALLMULTI) 625 dev_set_allmulti(lowerdev, -1); 626 del_unicast: 627 dev_uc_del(lowerdev, dev->dev_addr); 628 out: 629 if (vlan->fwd_priv) { 630 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 631 vlan->fwd_priv); 632 vlan->fwd_priv = NULL; 633 } 634 return err; 635 } 636 637 static int macvlan_stop(struct net_device *dev) 638 { 639 struct macvlan_dev *vlan = netdev_priv(dev); 640 struct net_device *lowerdev = vlan->lowerdev; 641 642 if (vlan->fwd_priv) { 643 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 644 vlan->fwd_priv); 645 vlan->fwd_priv = NULL; 646 return 0; 647 } 648 649 dev_uc_unsync(lowerdev, dev); 650 dev_mc_unsync(lowerdev, dev); 651 652 if (vlan->port->passthru) { 653 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 654 dev_set_promiscuity(lowerdev, -1); 655 goto hash_del; 656 } 657 658 if (dev->flags & IFF_ALLMULTI) 659 dev_set_allmulti(lowerdev, -1); 660 661 if (dev->flags & IFF_PROMISC) 662 dev_set_promiscuity(lowerdev, -1); 663 664 dev_uc_del(lowerdev, dev->dev_addr); 665 666 hash_del: 667 macvlan_hash_del(vlan, !dev->dismantle); 668 return 0; 669 } 670 671 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 672 { 673 struct macvlan_dev *vlan = netdev_priv(dev); 674 struct net_device *lowerdev = vlan->lowerdev; 675 int err; 676 677 if (!(dev->flags & IFF_UP)) { 678 /* Just copy in the new address */ 679 ether_addr_copy(dev->dev_addr, addr); 680 } else { 681 /* Rehash and update the device filters */ 682 if (macvlan_addr_busy(vlan->port, addr)) 683 return -EBUSY; 684 685 if (!vlan->port->passthru) { 686 err = dev_uc_add(lowerdev, addr); 687 if (err) 688 return err; 689 690 dev_uc_del(lowerdev, dev->dev_addr); 691 } 692 693 macvlan_hash_change_addr(vlan, addr); 694 } 695 return 0; 696 } 697 698 static int macvlan_set_mac_address(struct net_device *dev, void *p) 699 { 700 struct macvlan_dev *vlan = netdev_priv(dev); 701 struct sockaddr *addr = p; 702 703 if (!is_valid_ether_addr(addr->sa_data)) 704 return -EADDRNOTAVAIL; 705 706 /* If the addresses are the same, this is a no-op */ 707 if (ether_addr_equal(dev->dev_addr, addr->sa_data)) 708 return 0; 709 710 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 711 dev_set_mac_address(vlan->lowerdev, addr); 712 return 0; 713 } 714 715 return macvlan_sync_address(dev, addr->sa_data); 716 } 717 718 static void macvlan_change_rx_flags(struct net_device *dev, int change) 719 { 720 struct macvlan_dev *vlan = netdev_priv(dev); 721 struct net_device *lowerdev = vlan->lowerdev; 722 723 if (dev->flags & IFF_UP) { 724 if (change & IFF_ALLMULTI) 725 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 726 if (change & IFF_PROMISC) 727 dev_set_promiscuity(lowerdev, 728 dev->flags & IFF_PROMISC ? 1 : -1); 729 730 } 731 } 732 733 static void macvlan_compute_filter(unsigned long *mc_filter, 734 struct net_device *dev, 735 struct macvlan_dev *vlan) 736 { 737 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 738 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 739 } else { 740 struct netdev_hw_addr *ha; 741 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 742 743 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 744 netdev_for_each_mc_addr(ha, dev) { 745 __set_bit(mc_hash(vlan, ha->addr), filter); 746 } 747 748 __set_bit(mc_hash(vlan, dev->broadcast), filter); 749 750 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 751 } 752 } 753 754 static void macvlan_set_mac_lists(struct net_device *dev) 755 { 756 struct macvlan_dev *vlan = netdev_priv(dev); 757 758 macvlan_compute_filter(vlan->mc_filter, dev, vlan); 759 760 dev_uc_sync(vlan->lowerdev, dev); 761 dev_mc_sync(vlan->lowerdev, dev); 762 763 /* This is slightly inaccurate as we're including the subscription 764 * list of vlan->lowerdev too. 765 * 766 * Bug alert: This only works if everyone has the same broadcast 767 * address as lowerdev. As soon as someone changes theirs this 768 * will break. 769 * 770 * However, this is already broken as when you change your broadcast 771 * address we don't get called. 772 * 773 * The solution is to maintain a list of broadcast addresses like 774 * we do for uc/mc, if you care. 775 */ 776 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); 777 } 778 779 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 780 { 781 struct macvlan_dev *vlan = netdev_priv(dev); 782 783 if (vlan->lowerdev->mtu < new_mtu) 784 return -EINVAL; 785 dev->mtu = new_mtu; 786 return 0; 787 } 788 789 /* 790 * macvlan network devices have devices nesting below it and are a special 791 * "super class" of normal network devices; split their locks off into a 792 * separate class since they always nest. 793 */ 794 static struct lock_class_key macvlan_netdev_addr_lock_key; 795 796 #define ALWAYS_ON_OFFLOADS \ 797 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ 798 NETIF_F_GSO_ROBUST) 799 800 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX) 801 802 #define MACVLAN_FEATURES \ 803 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 804 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \ 805 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 806 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 807 808 #define MACVLAN_STATE_MASK \ 809 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 810 811 static int macvlan_get_nest_level(struct net_device *dev) 812 { 813 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 814 } 815 816 static void macvlan_set_lockdep_class(struct net_device *dev) 817 { 818 netdev_lockdep_set_classes(dev); 819 lockdep_set_class_and_subclass(&dev->addr_list_lock, 820 &macvlan_netdev_addr_lock_key, 821 macvlan_get_nest_level(dev)); 822 } 823 824 static int macvlan_init(struct net_device *dev) 825 { 826 struct macvlan_dev *vlan = netdev_priv(dev); 827 const struct net_device *lowerdev = vlan->lowerdev; 828 struct macvlan_port *port = vlan->port; 829 830 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 831 (lowerdev->state & MACVLAN_STATE_MASK); 832 dev->features = lowerdev->features & MACVLAN_FEATURES; 833 dev->features |= ALWAYS_ON_FEATURES; 834 dev->hw_features |= NETIF_F_LRO; 835 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 836 dev->vlan_features |= ALWAYS_ON_OFFLOADS; 837 dev->gso_max_size = lowerdev->gso_max_size; 838 dev->gso_max_segs = lowerdev->gso_max_segs; 839 dev->hard_header_len = lowerdev->hard_header_len; 840 841 macvlan_set_lockdep_class(dev); 842 843 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 844 if (!vlan->pcpu_stats) 845 return -ENOMEM; 846 847 port->count += 1; 848 849 return 0; 850 } 851 852 static void macvlan_uninit(struct net_device *dev) 853 { 854 struct macvlan_dev *vlan = netdev_priv(dev); 855 struct macvlan_port *port = vlan->port; 856 857 free_percpu(vlan->pcpu_stats); 858 859 macvlan_flush_sources(port, vlan); 860 port->count -= 1; 861 if (!port->count) 862 macvlan_port_destroy(port->dev); 863 } 864 865 static void macvlan_dev_get_stats64(struct net_device *dev, 866 struct rtnl_link_stats64 *stats) 867 { 868 struct macvlan_dev *vlan = netdev_priv(dev); 869 870 if (vlan->pcpu_stats) { 871 struct vlan_pcpu_stats *p; 872 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 873 u32 rx_errors = 0, tx_dropped = 0; 874 unsigned int start; 875 int i; 876 877 for_each_possible_cpu(i) { 878 p = per_cpu_ptr(vlan->pcpu_stats, i); 879 do { 880 start = u64_stats_fetch_begin_irq(&p->syncp); 881 rx_packets = p->rx_packets; 882 rx_bytes = p->rx_bytes; 883 rx_multicast = p->rx_multicast; 884 tx_packets = p->tx_packets; 885 tx_bytes = p->tx_bytes; 886 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 887 888 stats->rx_packets += rx_packets; 889 stats->rx_bytes += rx_bytes; 890 stats->multicast += rx_multicast; 891 stats->tx_packets += tx_packets; 892 stats->tx_bytes += tx_bytes; 893 /* rx_errors & tx_dropped are u32, updated 894 * without syncp protection. 895 */ 896 rx_errors += p->rx_errors; 897 tx_dropped += p->tx_dropped; 898 } 899 stats->rx_errors = rx_errors; 900 stats->rx_dropped = rx_errors; 901 stats->tx_dropped = tx_dropped; 902 } 903 } 904 905 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 906 __be16 proto, u16 vid) 907 { 908 struct macvlan_dev *vlan = netdev_priv(dev); 909 struct net_device *lowerdev = vlan->lowerdev; 910 911 return vlan_vid_add(lowerdev, proto, vid); 912 } 913 914 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 915 __be16 proto, u16 vid) 916 { 917 struct macvlan_dev *vlan = netdev_priv(dev); 918 struct net_device *lowerdev = vlan->lowerdev; 919 920 vlan_vid_del(lowerdev, proto, vid); 921 return 0; 922 } 923 924 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 925 struct net_device *dev, 926 const unsigned char *addr, u16 vid, 927 u16 flags) 928 { 929 struct macvlan_dev *vlan = netdev_priv(dev); 930 int err = -EINVAL; 931 932 /* Support unicast filter only on passthru devices. 933 * Multicast filter should be allowed on all devices. 934 */ 935 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 936 return -EOPNOTSUPP; 937 938 if (flags & NLM_F_REPLACE) 939 return -EOPNOTSUPP; 940 941 if (is_unicast_ether_addr(addr)) 942 err = dev_uc_add_excl(dev, addr); 943 else if (is_multicast_ether_addr(addr)) 944 err = dev_mc_add_excl(dev, addr); 945 946 return err; 947 } 948 949 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 950 struct net_device *dev, 951 const unsigned char *addr, u16 vid) 952 { 953 struct macvlan_dev *vlan = netdev_priv(dev); 954 int err = -EINVAL; 955 956 /* Support unicast filter only on passthru devices. 957 * Multicast filter should be allowed on all devices. 958 */ 959 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 960 return -EOPNOTSUPP; 961 962 if (is_unicast_ether_addr(addr)) 963 err = dev_uc_del(dev, addr); 964 else if (is_multicast_ether_addr(addr)) 965 err = dev_mc_del(dev, addr); 966 967 return err; 968 } 969 970 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 971 struct ethtool_drvinfo *drvinfo) 972 { 973 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 974 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 975 } 976 977 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 978 struct ethtool_link_ksettings *cmd) 979 { 980 const struct macvlan_dev *vlan = netdev_priv(dev); 981 982 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 983 } 984 985 static netdev_features_t macvlan_fix_features(struct net_device *dev, 986 netdev_features_t features) 987 { 988 struct macvlan_dev *vlan = netdev_priv(dev); 989 netdev_features_t lowerdev_features = vlan->lowerdev->features; 990 netdev_features_t mask; 991 992 features |= NETIF_F_ALL_FOR_ALL; 993 features &= (vlan->set_features | ~MACVLAN_FEATURES); 994 mask = features; 995 996 lowerdev_features &= (features | ~NETIF_F_LRO); 997 features = netdev_increment_features(lowerdev_features, features, mask); 998 features |= ALWAYS_ON_FEATURES; 999 features &= ~NETIF_F_NETNS_LOCAL; 1000 1001 return features; 1002 } 1003 1004 #ifdef CONFIG_NET_POLL_CONTROLLER 1005 static void macvlan_dev_poll_controller(struct net_device *dev) 1006 { 1007 return; 1008 } 1009 1010 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 1011 { 1012 struct macvlan_dev *vlan = netdev_priv(dev); 1013 struct net_device *real_dev = vlan->lowerdev; 1014 struct netpoll *netpoll; 1015 int err = 0; 1016 1017 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 1018 err = -ENOMEM; 1019 if (!netpoll) 1020 goto out; 1021 1022 err = __netpoll_setup(netpoll, real_dev); 1023 if (err) { 1024 kfree(netpoll); 1025 goto out; 1026 } 1027 1028 vlan->netpoll = netpoll; 1029 1030 out: 1031 return err; 1032 } 1033 1034 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1035 { 1036 struct macvlan_dev *vlan = netdev_priv(dev); 1037 struct netpoll *netpoll = vlan->netpoll; 1038 1039 if (!netpoll) 1040 return; 1041 1042 vlan->netpoll = NULL; 1043 1044 __netpoll_free_async(netpoll); 1045 } 1046 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1047 1048 static int macvlan_dev_get_iflink(const struct net_device *dev) 1049 { 1050 struct macvlan_dev *vlan = netdev_priv(dev); 1051 1052 return vlan->lowerdev->ifindex; 1053 } 1054 1055 static const struct ethtool_ops macvlan_ethtool_ops = { 1056 .get_link = ethtool_op_get_link, 1057 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1058 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1059 }; 1060 1061 static const struct net_device_ops macvlan_netdev_ops = { 1062 .ndo_init = macvlan_init, 1063 .ndo_uninit = macvlan_uninit, 1064 .ndo_open = macvlan_open, 1065 .ndo_stop = macvlan_stop, 1066 .ndo_start_xmit = macvlan_start_xmit, 1067 .ndo_change_mtu = macvlan_change_mtu, 1068 .ndo_fix_features = macvlan_fix_features, 1069 .ndo_change_rx_flags = macvlan_change_rx_flags, 1070 .ndo_set_mac_address = macvlan_set_mac_address, 1071 .ndo_set_rx_mode = macvlan_set_mac_lists, 1072 .ndo_get_stats64 = macvlan_dev_get_stats64, 1073 .ndo_validate_addr = eth_validate_addr, 1074 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1075 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1076 .ndo_fdb_add = macvlan_fdb_add, 1077 .ndo_fdb_del = macvlan_fdb_del, 1078 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1079 .ndo_get_lock_subclass = macvlan_get_nest_level, 1080 #ifdef CONFIG_NET_POLL_CONTROLLER 1081 .ndo_poll_controller = macvlan_dev_poll_controller, 1082 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1083 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1084 #endif 1085 .ndo_get_iflink = macvlan_dev_get_iflink, 1086 .ndo_features_check = passthru_features_check, 1087 }; 1088 1089 void macvlan_common_setup(struct net_device *dev) 1090 { 1091 ether_setup(dev); 1092 1093 dev->min_mtu = 0; 1094 dev->max_mtu = ETH_MAX_MTU; 1095 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1096 netif_keep_dst(dev); 1097 dev->priv_flags |= IFF_UNICAST_FLT; 1098 dev->netdev_ops = &macvlan_netdev_ops; 1099 dev->needs_free_netdev = true; 1100 dev->header_ops = &macvlan_hard_header_ops; 1101 dev->ethtool_ops = &macvlan_ethtool_ops; 1102 } 1103 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1104 1105 static void macvlan_setup(struct net_device *dev) 1106 { 1107 macvlan_common_setup(dev); 1108 dev->priv_flags |= IFF_NO_QUEUE; 1109 } 1110 1111 static int macvlan_port_create(struct net_device *dev) 1112 { 1113 struct macvlan_port *port; 1114 unsigned int i; 1115 int err; 1116 1117 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1118 return -EINVAL; 1119 1120 if (netdev_is_rx_handler_busy(dev)) 1121 return -EBUSY; 1122 1123 port = kzalloc(sizeof(*port), GFP_KERNEL); 1124 if (port == NULL) 1125 return -ENOMEM; 1126 1127 port->passthru = false; 1128 port->dev = dev; 1129 INIT_LIST_HEAD(&port->vlans); 1130 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1131 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1132 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1133 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1134 1135 skb_queue_head_init(&port->bc_queue); 1136 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1137 1138 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1139 if (err) 1140 kfree(port); 1141 else 1142 dev->priv_flags |= IFF_MACVLAN_PORT; 1143 return err; 1144 } 1145 1146 static void macvlan_port_destroy(struct net_device *dev) 1147 { 1148 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1149 struct sk_buff *skb; 1150 1151 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1152 netdev_rx_handler_unregister(dev); 1153 1154 /* After this point, no packet can schedule bc_work anymore, 1155 * but we need to cancel it and purge left skbs if any. 1156 */ 1157 cancel_work_sync(&port->bc_work); 1158 1159 while ((skb = __skb_dequeue(&port->bc_queue))) { 1160 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 1161 1162 if (src) 1163 dev_put(src->dev); 1164 1165 kfree_skb(skb); 1166 } 1167 1168 kfree(port); 1169 } 1170 1171 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 1172 { 1173 if (tb[IFLA_ADDRESS]) { 1174 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1175 return -EINVAL; 1176 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1177 return -EADDRNOTAVAIL; 1178 } 1179 1180 if (data && data[IFLA_MACVLAN_FLAGS] && 1181 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1182 return -EINVAL; 1183 1184 if (data && data[IFLA_MACVLAN_MODE]) { 1185 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1186 case MACVLAN_MODE_PRIVATE: 1187 case MACVLAN_MODE_VEPA: 1188 case MACVLAN_MODE_BRIDGE: 1189 case MACVLAN_MODE_PASSTHRU: 1190 case MACVLAN_MODE_SOURCE: 1191 break; 1192 default: 1193 return -EINVAL; 1194 } 1195 } 1196 1197 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1198 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1199 case MACVLAN_MACADDR_ADD: 1200 case MACVLAN_MACADDR_DEL: 1201 case MACVLAN_MACADDR_FLUSH: 1202 case MACVLAN_MACADDR_SET: 1203 break; 1204 default: 1205 return -EINVAL; 1206 } 1207 } 1208 1209 if (data && data[IFLA_MACVLAN_MACADDR]) { 1210 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1211 return -EINVAL; 1212 1213 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1214 return -EADDRNOTAVAIL; 1215 } 1216 1217 if (data && data[IFLA_MACVLAN_MACADDR_COUNT]) 1218 return -EINVAL; 1219 1220 return 0; 1221 } 1222 1223 /** 1224 * reconfigure list of remote source mac address 1225 * (only for macvlan devices in source mode) 1226 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1227 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1228 */ 1229 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1230 struct nlattr *data[]) 1231 { 1232 char *addr = NULL; 1233 int ret, rem, len; 1234 struct nlattr *nla, *head; 1235 struct macvlan_source_entry *entry; 1236 1237 if (data[IFLA_MACVLAN_MACADDR]) 1238 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1239 1240 if (mode == MACVLAN_MACADDR_ADD) { 1241 if (!addr) 1242 return -EINVAL; 1243 1244 return macvlan_hash_add_source(vlan, addr); 1245 1246 } else if (mode == MACVLAN_MACADDR_DEL) { 1247 if (!addr) 1248 return -EINVAL; 1249 1250 entry = macvlan_hash_lookup_source(vlan, addr); 1251 if (entry) { 1252 macvlan_hash_del_source(entry); 1253 vlan->macaddr_count--; 1254 } 1255 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1256 macvlan_flush_sources(vlan->port, vlan); 1257 } else if (mode == MACVLAN_MACADDR_SET) { 1258 macvlan_flush_sources(vlan->port, vlan); 1259 1260 if (addr) { 1261 ret = macvlan_hash_add_source(vlan, addr); 1262 if (ret) 1263 return ret; 1264 } 1265 1266 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1267 return 0; 1268 1269 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1270 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1271 1272 nla_for_each_attr(nla, head, len, rem) { 1273 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1274 nla_len(nla) != ETH_ALEN) 1275 continue; 1276 1277 addr = nla_data(nla); 1278 ret = macvlan_hash_add_source(vlan, addr); 1279 if (ret) 1280 return ret; 1281 } 1282 } else { 1283 return -EINVAL; 1284 } 1285 1286 return 0; 1287 } 1288 1289 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1290 struct nlattr *tb[], struct nlattr *data[]) 1291 { 1292 struct macvlan_dev *vlan = netdev_priv(dev); 1293 struct macvlan_port *port; 1294 struct net_device *lowerdev; 1295 int err; 1296 int macmode; 1297 bool create = false; 1298 1299 if (!tb[IFLA_LINK]) 1300 return -EINVAL; 1301 1302 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1303 if (lowerdev == NULL) 1304 return -ENODEV; 1305 1306 /* When creating macvlans or macvtaps on top of other macvlans - use 1307 * the real device as the lowerdev. 1308 */ 1309 if (netif_is_macvlan(lowerdev)) 1310 lowerdev = macvlan_dev_real_dev(lowerdev); 1311 1312 if (!tb[IFLA_MTU]) 1313 dev->mtu = lowerdev->mtu; 1314 else if (dev->mtu > lowerdev->mtu) 1315 return -EINVAL; 1316 1317 /* MTU range: 68 - lowerdev->max_mtu */ 1318 dev->min_mtu = ETH_MIN_MTU; 1319 dev->max_mtu = lowerdev->max_mtu; 1320 1321 if (!tb[IFLA_ADDRESS]) 1322 eth_hw_addr_random(dev); 1323 1324 if (!macvlan_port_exists(lowerdev)) { 1325 err = macvlan_port_create(lowerdev); 1326 if (err < 0) 1327 return err; 1328 create = true; 1329 } 1330 port = macvlan_port_get_rtnl(lowerdev); 1331 1332 /* Only 1 macvlan device can be created in passthru mode */ 1333 if (port->passthru) { 1334 /* The macvlan port must be not created this time, 1335 * still goto destroy_macvlan_port for readability. 1336 */ 1337 err = -EINVAL; 1338 goto destroy_macvlan_port; 1339 } 1340 1341 vlan->lowerdev = lowerdev; 1342 vlan->dev = dev; 1343 vlan->port = port; 1344 vlan->set_features = MACVLAN_FEATURES; 1345 vlan->nest_level = dev_get_nest_level(lowerdev) + 1; 1346 1347 vlan->mode = MACVLAN_MODE_VEPA; 1348 if (data && data[IFLA_MACVLAN_MODE]) 1349 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1350 1351 if (data && data[IFLA_MACVLAN_FLAGS]) 1352 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1353 1354 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1355 if (port->count) { 1356 err = -EINVAL; 1357 goto destroy_macvlan_port; 1358 } 1359 port->passthru = true; 1360 eth_hw_addr_inherit(dev, lowerdev); 1361 } 1362 1363 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1364 if (vlan->mode != MACVLAN_MODE_SOURCE) { 1365 err = -EINVAL; 1366 goto destroy_macvlan_port; 1367 } 1368 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1369 err = macvlan_changelink_sources(vlan, macmode, data); 1370 if (err) 1371 goto destroy_macvlan_port; 1372 } 1373 1374 err = register_netdevice(dev); 1375 if (err < 0) 1376 goto destroy_macvlan_port; 1377 1378 dev->priv_flags |= IFF_MACVLAN; 1379 err = netdev_upper_dev_link(lowerdev, dev); 1380 if (err) 1381 goto unregister_netdev; 1382 1383 list_add_tail_rcu(&vlan->list, &port->vlans); 1384 netif_stacked_transfer_operstate(lowerdev, dev); 1385 linkwatch_fire_event(dev); 1386 1387 return 0; 1388 1389 unregister_netdev: 1390 unregister_netdevice(dev); 1391 destroy_macvlan_port: 1392 if (create) 1393 macvlan_port_destroy(port->dev); 1394 return err; 1395 } 1396 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1397 1398 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1399 struct nlattr *tb[], struct nlattr *data[]) 1400 { 1401 return macvlan_common_newlink(src_net, dev, tb, data); 1402 } 1403 1404 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1405 { 1406 struct macvlan_dev *vlan = netdev_priv(dev); 1407 1408 if (vlan->mode == MACVLAN_MODE_SOURCE) 1409 macvlan_flush_sources(vlan->port, vlan); 1410 list_del_rcu(&vlan->list); 1411 unregister_netdevice_queue(dev, head); 1412 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1413 } 1414 EXPORT_SYMBOL_GPL(macvlan_dellink); 1415 1416 static int macvlan_changelink(struct net_device *dev, 1417 struct nlattr *tb[], struct nlattr *data[]) 1418 { 1419 struct macvlan_dev *vlan = netdev_priv(dev); 1420 enum macvlan_mode mode; 1421 bool set_mode = false; 1422 enum macvlan_macaddr_mode macmode; 1423 int ret; 1424 1425 /* Validate mode, but don't set yet: setting flags may fail. */ 1426 if (data && data[IFLA_MACVLAN_MODE]) { 1427 set_mode = true; 1428 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1429 /* Passthrough mode can't be set or cleared dynamically */ 1430 if ((mode == MACVLAN_MODE_PASSTHRU) != 1431 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1432 return -EINVAL; 1433 if (vlan->mode == MACVLAN_MODE_SOURCE && 1434 vlan->mode != mode) 1435 macvlan_flush_sources(vlan->port, vlan); 1436 } 1437 1438 if (data && data[IFLA_MACVLAN_FLAGS]) { 1439 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1440 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1441 if (vlan->port->passthru && promisc) { 1442 int err; 1443 1444 if (flags & MACVLAN_FLAG_NOPROMISC) 1445 err = dev_set_promiscuity(vlan->lowerdev, -1); 1446 else 1447 err = dev_set_promiscuity(vlan->lowerdev, 1); 1448 if (err < 0) 1449 return err; 1450 } 1451 vlan->flags = flags; 1452 } 1453 if (set_mode) 1454 vlan->mode = mode; 1455 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1456 if (vlan->mode != MACVLAN_MODE_SOURCE) 1457 return -EINVAL; 1458 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1459 ret = macvlan_changelink_sources(vlan, macmode, data); 1460 if (ret) 1461 return ret; 1462 } 1463 return 0; 1464 } 1465 1466 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1467 { 1468 if (vlan->macaddr_count == 0) 1469 return 0; 1470 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1471 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1472 } 1473 1474 static size_t macvlan_get_size(const struct net_device *dev) 1475 { 1476 struct macvlan_dev *vlan = netdev_priv(dev); 1477 1478 return (0 1479 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1480 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1481 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1482 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1483 ); 1484 } 1485 1486 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1487 const struct macvlan_dev *vlan, 1488 const int i) 1489 { 1490 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1491 struct macvlan_source_entry *entry; 1492 1493 hlist_for_each_entry_rcu(entry, h, hlist) { 1494 if (entry->vlan != vlan) 1495 continue; 1496 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1497 return 1; 1498 } 1499 return 0; 1500 } 1501 1502 static int macvlan_fill_info(struct sk_buff *skb, 1503 const struct net_device *dev) 1504 { 1505 struct macvlan_dev *vlan = netdev_priv(dev); 1506 int i; 1507 struct nlattr *nest; 1508 1509 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1510 goto nla_put_failure; 1511 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1512 goto nla_put_failure; 1513 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1514 goto nla_put_failure; 1515 if (vlan->macaddr_count > 0) { 1516 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1517 if (nest == NULL) 1518 goto nla_put_failure; 1519 1520 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1521 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1522 goto nla_put_failure; 1523 } 1524 nla_nest_end(skb, nest); 1525 } 1526 return 0; 1527 1528 nla_put_failure: 1529 return -EMSGSIZE; 1530 } 1531 1532 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1533 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1534 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1535 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1536 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1537 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1538 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1539 }; 1540 1541 int macvlan_link_register(struct rtnl_link_ops *ops) 1542 { 1543 /* common fields */ 1544 ops->validate = macvlan_validate; 1545 ops->maxtype = IFLA_MACVLAN_MAX; 1546 ops->policy = macvlan_policy; 1547 ops->changelink = macvlan_changelink; 1548 ops->get_size = macvlan_get_size; 1549 ops->fill_info = macvlan_fill_info; 1550 1551 return rtnl_link_register(ops); 1552 }; 1553 EXPORT_SYMBOL_GPL(macvlan_link_register); 1554 1555 static struct net *macvlan_get_link_net(const struct net_device *dev) 1556 { 1557 return dev_net(macvlan_dev_real_dev(dev)); 1558 } 1559 1560 static struct rtnl_link_ops macvlan_link_ops = { 1561 .kind = "macvlan", 1562 .setup = macvlan_setup, 1563 .newlink = macvlan_newlink, 1564 .dellink = macvlan_dellink, 1565 .get_link_net = macvlan_get_link_net, 1566 .priv_size = sizeof(struct macvlan_dev), 1567 }; 1568 1569 static int macvlan_device_event(struct notifier_block *unused, 1570 unsigned long event, void *ptr) 1571 { 1572 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1573 struct macvlan_dev *vlan, *next; 1574 struct macvlan_port *port; 1575 LIST_HEAD(list_kill); 1576 1577 if (!macvlan_port_exists(dev)) 1578 return NOTIFY_DONE; 1579 1580 port = macvlan_port_get_rtnl(dev); 1581 1582 switch (event) { 1583 case NETDEV_UP: 1584 case NETDEV_CHANGE: 1585 list_for_each_entry(vlan, &port->vlans, list) 1586 netif_stacked_transfer_operstate(vlan->lowerdev, 1587 vlan->dev); 1588 break; 1589 case NETDEV_FEAT_CHANGE: 1590 list_for_each_entry(vlan, &port->vlans, list) { 1591 vlan->dev->gso_max_size = dev->gso_max_size; 1592 vlan->dev->gso_max_segs = dev->gso_max_segs; 1593 netdev_update_features(vlan->dev); 1594 } 1595 break; 1596 case NETDEV_CHANGEMTU: 1597 list_for_each_entry(vlan, &port->vlans, list) { 1598 if (vlan->dev->mtu <= dev->mtu) 1599 continue; 1600 dev_set_mtu(vlan->dev, dev->mtu); 1601 } 1602 break; 1603 case NETDEV_CHANGEADDR: 1604 if (!port->passthru) 1605 return NOTIFY_DONE; 1606 1607 vlan = list_first_entry_or_null(&port->vlans, 1608 struct macvlan_dev, 1609 list); 1610 1611 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1612 return NOTIFY_BAD; 1613 1614 break; 1615 case NETDEV_UNREGISTER: 1616 /* twiddle thumbs on netns device moves */ 1617 if (dev->reg_state != NETREG_UNREGISTERING) 1618 break; 1619 1620 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1621 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1622 unregister_netdevice_many(&list_kill); 1623 break; 1624 case NETDEV_PRE_TYPE_CHANGE: 1625 /* Forbid underlaying device to change its type. */ 1626 return NOTIFY_BAD; 1627 1628 case NETDEV_NOTIFY_PEERS: 1629 case NETDEV_BONDING_FAILOVER: 1630 case NETDEV_RESEND_IGMP: 1631 /* Propagate to all vlans */ 1632 list_for_each_entry(vlan, &port->vlans, list) 1633 call_netdevice_notifiers(event, vlan->dev); 1634 } 1635 return NOTIFY_DONE; 1636 } 1637 1638 static struct notifier_block macvlan_notifier_block __read_mostly = { 1639 .notifier_call = macvlan_device_event, 1640 }; 1641 1642 static int __init macvlan_init_module(void) 1643 { 1644 int err; 1645 1646 register_netdevice_notifier(&macvlan_notifier_block); 1647 1648 err = macvlan_link_register(&macvlan_link_ops); 1649 if (err < 0) 1650 goto err1; 1651 return 0; 1652 err1: 1653 unregister_netdevice_notifier(&macvlan_notifier_block); 1654 return err; 1655 } 1656 1657 static void __exit macvlan_cleanup_module(void) 1658 { 1659 rtnl_link_unregister(&macvlan_link_ops); 1660 unregister_netdevice_notifier(&macvlan_notifier_block); 1661 } 1662 1663 module_init(macvlan_init_module); 1664 module_exit(macvlan_cleanup_module); 1665 1666 MODULE_LICENSE("GPL"); 1667 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1668 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1669 MODULE_ALIAS_RTNL_LINK("macvlan"); 1670