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 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ); 53 }; 54 55 struct macvlan_source_entry { 56 struct hlist_node hlist; 57 struct macvlan_dev *vlan; 58 unsigned char addr[6+2] __aligned(sizeof(u16)); 59 struct rcu_head rcu; 60 }; 61 62 struct macvlan_skb_cb { 63 const struct macvlan_dev *src; 64 }; 65 66 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 67 68 static void macvlan_port_destroy(struct net_device *dev); 69 70 /* Hash Ethernet address */ 71 static u32 macvlan_eth_hash(const unsigned char *addr) 72 { 73 u64 value = get_unaligned((u64 *)addr); 74 75 /* only want 6 bytes */ 76 #ifdef __BIG_ENDIAN 77 value >>= 16; 78 #else 79 value <<= 16; 80 #endif 81 return hash_64(value, MACVLAN_HASH_BITS); 82 } 83 84 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 85 { 86 return rcu_dereference(dev->rx_handler_data); 87 } 88 89 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 90 { 91 return rtnl_dereference(dev->rx_handler_data); 92 } 93 94 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 95 96 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 97 const unsigned char *addr) 98 { 99 struct macvlan_dev *vlan; 100 u32 idx = macvlan_eth_hash(addr); 101 102 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) { 103 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 104 return vlan; 105 } 106 return NULL; 107 } 108 109 static struct macvlan_source_entry *macvlan_hash_lookup_source( 110 const struct macvlan_dev *vlan, 111 const unsigned char *addr) 112 { 113 struct macvlan_source_entry *entry; 114 u32 idx = macvlan_eth_hash(addr); 115 struct hlist_head *h = &vlan->port->vlan_source_hash[idx]; 116 117 hlist_for_each_entry_rcu(entry, h, hlist) { 118 if (ether_addr_equal_64bits(entry->addr, addr) && 119 entry->vlan == vlan) 120 return entry; 121 } 122 return NULL; 123 } 124 125 static int macvlan_hash_add_source(struct macvlan_dev *vlan, 126 const unsigned char *addr) 127 { 128 struct macvlan_port *port = vlan->port; 129 struct macvlan_source_entry *entry; 130 struct hlist_head *h; 131 132 entry = macvlan_hash_lookup_source(vlan, addr); 133 if (entry) 134 return 0; 135 136 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 137 if (!entry) 138 return -ENOMEM; 139 140 ether_addr_copy(entry->addr, addr); 141 entry->vlan = vlan; 142 h = &port->vlan_source_hash[macvlan_eth_hash(addr)]; 143 hlist_add_head_rcu(&entry->hlist, h); 144 vlan->macaddr_count++; 145 146 return 0; 147 } 148 149 static void macvlan_hash_add(struct macvlan_dev *vlan) 150 { 151 struct macvlan_port *port = vlan->port; 152 const unsigned char *addr = vlan->dev->dev_addr; 153 u32 idx = macvlan_eth_hash(addr); 154 155 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]); 156 } 157 158 static void macvlan_hash_del_source(struct macvlan_source_entry *entry) 159 { 160 hlist_del_rcu(&entry->hlist); 161 kfree_rcu(entry, rcu); 162 } 163 164 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 165 { 166 hlist_del_rcu(&vlan->hlist); 167 if (sync) 168 synchronize_rcu(); 169 } 170 171 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 172 const unsigned char *addr) 173 { 174 macvlan_hash_del(vlan, true); 175 /* Now that we are unhashed it is safe to change the device 176 * address without confusing packet delivery. 177 */ 178 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 179 macvlan_hash_add(vlan); 180 } 181 182 static int macvlan_addr_busy(const struct macvlan_port *port, 183 const unsigned char *addr) 184 { 185 /* Test to see if the specified multicast address is 186 * currently in use by the underlying device or 187 * another macvlan. 188 */ 189 if (ether_addr_equal_64bits(port->dev->dev_addr, addr)) 190 return 1; 191 192 if (macvlan_hash_lookup(port, addr)) 193 return 1; 194 195 return 0; 196 } 197 198 199 static int macvlan_broadcast_one(struct sk_buff *skb, 200 const struct macvlan_dev *vlan, 201 const struct ethhdr *eth, bool local) 202 { 203 struct net_device *dev = vlan->dev; 204 205 if (local) 206 return __dev_forward_skb(dev, skb); 207 208 skb->dev = dev; 209 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 210 skb->pkt_type = PACKET_BROADCAST; 211 else 212 skb->pkt_type = PACKET_MULTICAST; 213 214 return 0; 215 } 216 217 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 218 { 219 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 220 } 221 222 223 static unsigned int mc_hash(const struct macvlan_dev *vlan, 224 const unsigned char *addr) 225 { 226 u32 val = __get_unaligned_cpu32(addr + 2); 227 228 val ^= macvlan_hash_mix(vlan); 229 return hash_32(val, MACVLAN_MC_FILTER_BITS); 230 } 231 232 static void macvlan_broadcast(struct sk_buff *skb, 233 const struct macvlan_port *port, 234 struct net_device *src, 235 enum macvlan_mode mode) 236 { 237 const struct ethhdr *eth = eth_hdr(skb); 238 const struct macvlan_dev *vlan; 239 struct sk_buff *nskb; 240 unsigned int i; 241 int err; 242 unsigned int hash; 243 244 if (skb->protocol == htons(ETH_P_PAUSE)) 245 return; 246 247 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 248 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 249 if (vlan->dev == src || !(vlan->mode & mode)) 250 continue; 251 252 hash = mc_hash(vlan, eth->h_dest); 253 if (!test_bit(hash, vlan->mc_filter)) 254 continue; 255 256 err = NET_RX_DROP; 257 nskb = skb_clone(skb, GFP_ATOMIC); 258 if (likely(nskb)) 259 err = macvlan_broadcast_one( 260 nskb, vlan, eth, 261 mode == MACVLAN_MODE_BRIDGE) ?: 262 netif_rx_ni(nskb); 263 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 264 err == NET_RX_SUCCESS, true); 265 } 266 } 267 } 268 269 static void macvlan_process_broadcast(struct work_struct *w) 270 { 271 struct macvlan_port *port = container_of(w, struct macvlan_port, 272 bc_work); 273 struct sk_buff *skb; 274 struct sk_buff_head list; 275 276 __skb_queue_head_init(&list); 277 278 spin_lock_bh(&port->bc_queue.lock); 279 skb_queue_splice_tail_init(&port->bc_queue, &list); 280 spin_unlock_bh(&port->bc_queue.lock); 281 282 while ((skb = __skb_dequeue(&list))) { 283 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 284 285 rcu_read_lock(); 286 287 if (!src) 288 /* frame comes from an external address */ 289 macvlan_broadcast(skb, port, NULL, 290 MACVLAN_MODE_PRIVATE | 291 MACVLAN_MODE_VEPA | 292 MACVLAN_MODE_PASSTHRU| 293 MACVLAN_MODE_BRIDGE); 294 else if (src->mode == MACVLAN_MODE_VEPA) 295 /* flood to everyone except source */ 296 macvlan_broadcast(skb, port, src->dev, 297 MACVLAN_MODE_VEPA | 298 MACVLAN_MODE_BRIDGE); 299 else 300 /* 301 * flood only to VEPA ports, bridge ports 302 * already saw the frame on the way out. 303 */ 304 macvlan_broadcast(skb, port, src->dev, 305 MACVLAN_MODE_VEPA); 306 307 rcu_read_unlock(); 308 309 if (src) 310 dev_put(src->dev); 311 kfree_skb(skb); 312 } 313 } 314 315 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 316 const struct macvlan_dev *src, 317 struct sk_buff *skb) 318 { 319 struct sk_buff *nskb; 320 int err = -ENOMEM; 321 322 nskb = skb_clone(skb, GFP_ATOMIC); 323 if (!nskb) 324 goto err; 325 326 MACVLAN_SKB_CB(nskb)->src = src; 327 328 spin_lock(&port->bc_queue.lock); 329 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) { 330 if (src) 331 dev_hold(src->dev); 332 __skb_queue_tail(&port->bc_queue, nskb); 333 err = 0; 334 } 335 spin_unlock(&port->bc_queue.lock); 336 337 if (err) 338 goto free_nskb; 339 340 schedule_work(&port->bc_work); 341 return; 342 343 free_nskb: 344 kfree_skb(nskb); 345 err: 346 atomic_long_inc(&skb->dev->rx_dropped); 347 } 348 349 static void macvlan_flush_sources(struct macvlan_port *port, 350 struct macvlan_dev *vlan) 351 { 352 int i; 353 354 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 355 struct hlist_node *h, *n; 356 357 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) { 358 struct macvlan_source_entry *entry; 359 360 entry = hlist_entry(h, struct macvlan_source_entry, 361 hlist); 362 if (entry->vlan == vlan) 363 macvlan_hash_del_source(entry); 364 } 365 } 366 vlan->macaddr_count = 0; 367 } 368 369 static void macvlan_forward_source_one(struct sk_buff *skb, 370 struct macvlan_dev *vlan) 371 { 372 struct sk_buff *nskb; 373 struct net_device *dev; 374 int len; 375 int ret; 376 377 dev = vlan->dev; 378 if (unlikely(!(dev->flags & IFF_UP))) 379 return; 380 381 nskb = skb_clone(skb, GFP_ATOMIC); 382 if (!nskb) 383 return; 384 385 len = nskb->len + ETH_HLEN; 386 nskb->dev = dev; 387 nskb->pkt_type = PACKET_HOST; 388 389 ret = netif_rx(nskb); 390 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 391 } 392 393 static void macvlan_forward_source(struct sk_buff *skb, 394 struct macvlan_port *port, 395 const unsigned char *addr) 396 { 397 struct macvlan_source_entry *entry; 398 u32 idx = macvlan_eth_hash(addr); 399 struct hlist_head *h = &port->vlan_source_hash[idx]; 400 401 hlist_for_each_entry_rcu(entry, h, hlist) { 402 if (ether_addr_equal_64bits(entry->addr, addr)) 403 if (entry->vlan->dev->flags & IFF_UP) 404 macvlan_forward_source_one(skb, entry->vlan); 405 } 406 } 407 408 /* called under rcu_read_lock() from netif_receive_skb */ 409 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 410 { 411 struct macvlan_port *port; 412 struct sk_buff *skb = *pskb; 413 const struct ethhdr *eth = eth_hdr(skb); 414 const struct macvlan_dev *vlan; 415 const struct macvlan_dev *src; 416 struct net_device *dev; 417 unsigned int len = 0; 418 int ret; 419 rx_handler_result_t handle_res; 420 421 port = macvlan_port_get_rcu(skb->dev); 422 if (is_multicast_ether_addr(eth->h_dest)) { 423 unsigned int hash; 424 425 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); 426 if (!skb) 427 return RX_HANDLER_CONSUMED; 428 *pskb = skb; 429 eth = eth_hdr(skb); 430 macvlan_forward_source(skb, port, eth->h_source); 431 src = macvlan_hash_lookup(port, eth->h_source); 432 if (src && src->mode != MACVLAN_MODE_VEPA && 433 src->mode != MACVLAN_MODE_BRIDGE) { 434 /* forward to original port. */ 435 vlan = src; 436 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 437 netif_rx(skb); 438 handle_res = RX_HANDLER_CONSUMED; 439 goto out; 440 } 441 442 hash = mc_hash(NULL, eth->h_dest); 443 if (test_bit(hash, port->mc_filter)) 444 macvlan_broadcast_enqueue(port, src, skb); 445 446 return RX_HANDLER_PASS; 447 } 448 449 macvlan_forward_source(skb, port, eth->h_source); 450 if (port->passthru) 451 vlan = list_first_or_null_rcu(&port->vlans, 452 struct macvlan_dev, list); 453 else 454 vlan = macvlan_hash_lookup(port, eth->h_dest); 455 if (vlan == NULL) 456 return RX_HANDLER_PASS; 457 458 dev = vlan->dev; 459 if (unlikely(!(dev->flags & IFF_UP))) { 460 kfree_skb(skb); 461 return RX_HANDLER_CONSUMED; 462 } 463 len = skb->len + ETH_HLEN; 464 skb = skb_share_check(skb, GFP_ATOMIC); 465 if (!skb) { 466 ret = NET_RX_DROP; 467 handle_res = RX_HANDLER_CONSUMED; 468 goto out; 469 } 470 471 *pskb = skb; 472 skb->dev = dev; 473 skb->pkt_type = PACKET_HOST; 474 475 ret = NET_RX_SUCCESS; 476 handle_res = RX_HANDLER_ANOTHER; 477 out: 478 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 479 return handle_res; 480 } 481 482 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 483 { 484 const struct macvlan_dev *vlan = netdev_priv(dev); 485 const struct macvlan_port *port = vlan->port; 486 const struct macvlan_dev *dest; 487 488 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 489 const struct ethhdr *eth = (void *)skb->data; 490 491 /* send to other bridge ports directly */ 492 if (is_multicast_ether_addr(eth->h_dest)) { 493 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 494 goto xmit_world; 495 } 496 497 dest = macvlan_hash_lookup(port, eth->h_dest); 498 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 499 /* send to lowerdev first for its network taps */ 500 dev_forward_skb(vlan->lowerdev, skb); 501 502 return NET_XMIT_SUCCESS; 503 } 504 } 505 506 xmit_world: 507 skb->dev = vlan->lowerdev; 508 return dev_queue_xmit(skb); 509 } 510 511 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 512 { 513 #ifdef CONFIG_NET_POLL_CONTROLLER 514 if (vlan->netpoll) 515 netpoll_send_skb(vlan->netpoll, skb); 516 #else 517 BUG(); 518 #endif 519 return NETDEV_TX_OK; 520 } 521 522 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 523 struct net_device *dev) 524 { 525 unsigned int len = skb->len; 526 int ret; 527 struct macvlan_dev *vlan = netdev_priv(dev); 528 529 if (unlikely(netpoll_tx_running(dev))) 530 return macvlan_netpoll_send_skb(vlan, skb); 531 532 if (vlan->fwd_priv) { 533 skb->dev = vlan->lowerdev; 534 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); 535 } else { 536 ret = macvlan_queue_xmit(skb, dev); 537 } 538 539 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 540 struct vlan_pcpu_stats *pcpu_stats; 541 542 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 543 u64_stats_update_begin(&pcpu_stats->syncp); 544 pcpu_stats->tx_packets++; 545 pcpu_stats->tx_bytes += len; 546 u64_stats_update_end(&pcpu_stats->syncp); 547 } else { 548 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 549 } 550 return ret; 551 } 552 553 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 554 unsigned short type, const void *daddr, 555 const void *saddr, unsigned len) 556 { 557 const struct macvlan_dev *vlan = netdev_priv(dev); 558 struct net_device *lowerdev = vlan->lowerdev; 559 560 return dev_hard_header(skb, lowerdev, type, daddr, 561 saddr ? : dev->dev_addr, len); 562 } 563 564 static const struct header_ops macvlan_hard_header_ops = { 565 .create = macvlan_hard_header, 566 .parse = eth_header_parse, 567 .cache = eth_header_cache, 568 .cache_update = eth_header_cache_update, 569 }; 570 571 static struct rtnl_link_ops macvlan_link_ops; 572 573 static int macvlan_open(struct net_device *dev) 574 { 575 struct macvlan_dev *vlan = netdev_priv(dev); 576 struct net_device *lowerdev = vlan->lowerdev; 577 int err; 578 579 if (vlan->port->passthru) { 580 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 581 err = dev_set_promiscuity(lowerdev, 1); 582 if (err < 0) 583 goto out; 584 } 585 goto hash_add; 586 } 587 588 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && 589 dev->rtnl_link_ops == &macvlan_link_ops) { 590 vlan->fwd_priv = 591 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 592 593 /* If we get a NULL pointer back, or if we get an error 594 * then we should just fall through to the non accelerated path 595 */ 596 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 597 vlan->fwd_priv = NULL; 598 } else 599 return 0; 600 } 601 602 err = -EBUSY; 603 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 604 goto out; 605 606 err = dev_uc_add(lowerdev, dev->dev_addr); 607 if (err < 0) 608 goto out; 609 if (dev->flags & IFF_ALLMULTI) { 610 err = dev_set_allmulti(lowerdev, 1); 611 if (err < 0) 612 goto del_unicast; 613 } 614 615 if (dev->flags & IFF_PROMISC) { 616 err = dev_set_promiscuity(lowerdev, 1); 617 if (err < 0) 618 goto clear_multi; 619 } 620 621 hash_add: 622 macvlan_hash_add(vlan); 623 return 0; 624 625 clear_multi: 626 if (dev->flags & IFF_ALLMULTI) 627 dev_set_allmulti(lowerdev, -1); 628 del_unicast: 629 dev_uc_del(lowerdev, dev->dev_addr); 630 out: 631 if (vlan->fwd_priv) { 632 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 633 vlan->fwd_priv); 634 vlan->fwd_priv = NULL; 635 } 636 return err; 637 } 638 639 static int macvlan_stop(struct net_device *dev) 640 { 641 struct macvlan_dev *vlan = netdev_priv(dev); 642 struct net_device *lowerdev = vlan->lowerdev; 643 644 if (vlan->fwd_priv) { 645 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 646 vlan->fwd_priv); 647 vlan->fwd_priv = NULL; 648 return 0; 649 } 650 651 dev_uc_unsync(lowerdev, dev); 652 dev_mc_unsync(lowerdev, dev); 653 654 if (vlan->port->passthru) { 655 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 656 dev_set_promiscuity(lowerdev, -1); 657 goto hash_del; 658 } 659 660 if (dev->flags & IFF_ALLMULTI) 661 dev_set_allmulti(lowerdev, -1); 662 663 if (dev->flags & IFF_PROMISC) 664 dev_set_promiscuity(lowerdev, -1); 665 666 dev_uc_del(lowerdev, dev->dev_addr); 667 668 hash_del: 669 macvlan_hash_del(vlan, !dev->dismantle); 670 return 0; 671 } 672 673 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 674 { 675 struct macvlan_dev *vlan = netdev_priv(dev); 676 struct net_device *lowerdev = vlan->lowerdev; 677 int err; 678 679 if (!(dev->flags & IFF_UP)) { 680 /* Just copy in the new address */ 681 ether_addr_copy(dev->dev_addr, addr); 682 } else { 683 /* Rehash and update the device filters */ 684 if (macvlan_addr_busy(vlan->port, addr)) 685 return -EBUSY; 686 687 if (!vlan->port->passthru) { 688 err = dev_uc_add(lowerdev, addr); 689 if (err) 690 return err; 691 692 dev_uc_del(lowerdev, dev->dev_addr); 693 } 694 695 macvlan_hash_change_addr(vlan, addr); 696 } 697 return 0; 698 } 699 700 static int macvlan_set_mac_address(struct net_device *dev, void *p) 701 { 702 struct macvlan_dev *vlan = netdev_priv(dev); 703 struct sockaddr *addr = p; 704 705 if (!is_valid_ether_addr(addr->sa_data)) 706 return -EADDRNOTAVAIL; 707 708 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 709 dev_set_mac_address(vlan->lowerdev, addr); 710 return 0; 711 } 712 713 return macvlan_sync_address(dev, addr->sa_data); 714 } 715 716 static void macvlan_change_rx_flags(struct net_device *dev, int change) 717 { 718 struct macvlan_dev *vlan = netdev_priv(dev); 719 struct net_device *lowerdev = vlan->lowerdev; 720 721 if (dev->flags & IFF_UP) { 722 if (change & IFF_ALLMULTI) 723 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 724 if (change & IFF_PROMISC) 725 dev_set_promiscuity(lowerdev, 726 dev->flags & IFF_PROMISC ? 1 : -1); 727 728 } 729 } 730 731 static void macvlan_compute_filter(unsigned long *mc_filter, 732 struct net_device *dev, 733 struct macvlan_dev *vlan) 734 { 735 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 736 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 737 } else { 738 struct netdev_hw_addr *ha; 739 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 740 741 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 742 netdev_for_each_mc_addr(ha, dev) { 743 __set_bit(mc_hash(vlan, ha->addr), filter); 744 } 745 746 __set_bit(mc_hash(vlan, dev->broadcast), filter); 747 748 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 749 } 750 } 751 752 static void macvlan_set_mac_lists(struct net_device *dev) 753 { 754 struct macvlan_dev *vlan = netdev_priv(dev); 755 756 macvlan_compute_filter(vlan->mc_filter, dev, vlan); 757 758 dev_uc_sync(vlan->lowerdev, dev); 759 dev_mc_sync(vlan->lowerdev, dev); 760 761 /* This is slightly inaccurate as we're including the subscription 762 * list of vlan->lowerdev too. 763 * 764 * Bug alert: This only works if everyone has the same broadcast 765 * address as lowerdev. As soon as someone changes theirs this 766 * will break. 767 * 768 * However, this is already broken as when you change your broadcast 769 * address we don't get called. 770 * 771 * The solution is to maintain a list of broadcast addresses like 772 * we do for uc/mc, if you care. 773 */ 774 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); 775 } 776 777 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 778 { 779 struct macvlan_dev *vlan = netdev_priv(dev); 780 781 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 782 return -EINVAL; 783 dev->mtu = new_mtu; 784 return 0; 785 } 786 787 /* 788 * macvlan network devices have devices nesting below it and are a special 789 * "super class" of normal network devices; split their locks off into a 790 * separate class since they always nest. 791 */ 792 static struct lock_class_key macvlan_netdev_addr_lock_key; 793 794 #define ALWAYS_ON_FEATURES \ 795 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \ 796 NETIF_F_GSO_ROBUST) 797 798 #define MACVLAN_FEATURES \ 799 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 800 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \ 801 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 802 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 803 804 #define MACVLAN_STATE_MASK \ 805 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 806 807 static int macvlan_get_nest_level(struct net_device *dev) 808 { 809 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 810 } 811 812 static void macvlan_set_lockdep_class(struct net_device *dev) 813 { 814 netdev_lockdep_set_classes(dev); 815 lockdep_set_class_and_subclass(&dev->addr_list_lock, 816 &macvlan_netdev_addr_lock_key, 817 macvlan_get_nest_level(dev)); 818 } 819 820 static int macvlan_init(struct net_device *dev) 821 { 822 struct macvlan_dev *vlan = netdev_priv(dev); 823 const struct net_device *lowerdev = vlan->lowerdev; 824 struct macvlan_port *port = vlan->port; 825 826 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 827 (lowerdev->state & MACVLAN_STATE_MASK); 828 dev->features = lowerdev->features & MACVLAN_FEATURES; 829 dev->features |= ALWAYS_ON_FEATURES; 830 dev->hw_features |= NETIF_F_LRO; 831 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 832 dev->gso_max_size = lowerdev->gso_max_size; 833 dev->gso_max_segs = lowerdev->gso_max_segs; 834 dev->hard_header_len = lowerdev->hard_header_len; 835 836 macvlan_set_lockdep_class(dev); 837 838 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 839 if (!vlan->pcpu_stats) 840 return -ENOMEM; 841 842 port->count += 1; 843 844 return 0; 845 } 846 847 static void macvlan_uninit(struct net_device *dev) 848 { 849 struct macvlan_dev *vlan = netdev_priv(dev); 850 struct macvlan_port *port = vlan->port; 851 852 free_percpu(vlan->pcpu_stats); 853 854 macvlan_flush_sources(port, vlan); 855 port->count -= 1; 856 if (!port->count) 857 macvlan_port_destroy(port->dev); 858 } 859 860 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 861 struct rtnl_link_stats64 *stats) 862 { 863 struct macvlan_dev *vlan = netdev_priv(dev); 864 865 if (vlan->pcpu_stats) { 866 struct vlan_pcpu_stats *p; 867 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 868 u32 rx_errors = 0, tx_dropped = 0; 869 unsigned int start; 870 int i; 871 872 for_each_possible_cpu(i) { 873 p = per_cpu_ptr(vlan->pcpu_stats, i); 874 do { 875 start = u64_stats_fetch_begin_irq(&p->syncp); 876 rx_packets = p->rx_packets; 877 rx_bytes = p->rx_bytes; 878 rx_multicast = p->rx_multicast; 879 tx_packets = p->tx_packets; 880 tx_bytes = p->tx_bytes; 881 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 882 883 stats->rx_packets += rx_packets; 884 stats->rx_bytes += rx_bytes; 885 stats->multicast += rx_multicast; 886 stats->tx_packets += tx_packets; 887 stats->tx_bytes += tx_bytes; 888 /* rx_errors & tx_dropped are u32, updated 889 * without syncp protection. 890 */ 891 rx_errors += p->rx_errors; 892 tx_dropped += p->tx_dropped; 893 } 894 stats->rx_errors = rx_errors; 895 stats->rx_dropped = rx_errors; 896 stats->tx_dropped = tx_dropped; 897 } 898 return stats; 899 } 900 901 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 902 __be16 proto, u16 vid) 903 { 904 struct macvlan_dev *vlan = netdev_priv(dev); 905 struct net_device *lowerdev = vlan->lowerdev; 906 907 return vlan_vid_add(lowerdev, proto, vid); 908 } 909 910 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 911 __be16 proto, u16 vid) 912 { 913 struct macvlan_dev *vlan = netdev_priv(dev); 914 struct net_device *lowerdev = vlan->lowerdev; 915 916 vlan_vid_del(lowerdev, proto, vid); 917 return 0; 918 } 919 920 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 921 struct net_device *dev, 922 const unsigned char *addr, u16 vid, 923 u16 flags) 924 { 925 struct macvlan_dev *vlan = netdev_priv(dev); 926 int err = -EINVAL; 927 928 /* Support unicast filter only on passthru devices. 929 * Multicast filter should be allowed on all devices. 930 */ 931 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 932 return -EOPNOTSUPP; 933 934 if (flags & NLM_F_REPLACE) 935 return -EOPNOTSUPP; 936 937 if (is_unicast_ether_addr(addr)) 938 err = dev_uc_add_excl(dev, addr); 939 else if (is_multicast_ether_addr(addr)) 940 err = dev_mc_add_excl(dev, addr); 941 942 return err; 943 } 944 945 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 946 struct net_device *dev, 947 const unsigned char *addr, u16 vid) 948 { 949 struct macvlan_dev *vlan = netdev_priv(dev); 950 int err = -EINVAL; 951 952 /* Support unicast filter only on passthru devices. 953 * Multicast filter should be allowed on all devices. 954 */ 955 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 956 return -EOPNOTSUPP; 957 958 if (is_unicast_ether_addr(addr)) 959 err = dev_uc_del(dev, addr); 960 else if (is_multicast_ether_addr(addr)) 961 err = dev_mc_del(dev, addr); 962 963 return err; 964 } 965 966 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 967 struct ethtool_drvinfo *drvinfo) 968 { 969 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 970 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 971 } 972 973 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 974 struct ethtool_link_ksettings *cmd) 975 { 976 const struct macvlan_dev *vlan = netdev_priv(dev); 977 978 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 979 } 980 981 static netdev_features_t macvlan_fix_features(struct net_device *dev, 982 netdev_features_t features) 983 { 984 struct macvlan_dev *vlan = netdev_priv(dev); 985 netdev_features_t lowerdev_features = vlan->lowerdev->features; 986 netdev_features_t mask; 987 988 features |= NETIF_F_ALL_FOR_ALL; 989 features &= (vlan->set_features | ~MACVLAN_FEATURES); 990 mask = features; 991 992 lowerdev_features &= (features | ~NETIF_F_LRO); 993 features = netdev_increment_features(lowerdev_features, features, mask); 994 features |= ALWAYS_ON_FEATURES; 995 features &= ~NETIF_F_NETNS_LOCAL; 996 997 return features; 998 } 999 1000 #ifdef CONFIG_NET_POLL_CONTROLLER 1001 static void macvlan_dev_poll_controller(struct net_device *dev) 1002 { 1003 return; 1004 } 1005 1006 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 1007 { 1008 struct macvlan_dev *vlan = netdev_priv(dev); 1009 struct net_device *real_dev = vlan->lowerdev; 1010 struct netpoll *netpoll; 1011 int err = 0; 1012 1013 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 1014 err = -ENOMEM; 1015 if (!netpoll) 1016 goto out; 1017 1018 err = __netpoll_setup(netpoll, real_dev); 1019 if (err) { 1020 kfree(netpoll); 1021 goto out; 1022 } 1023 1024 vlan->netpoll = netpoll; 1025 1026 out: 1027 return err; 1028 } 1029 1030 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1031 { 1032 struct macvlan_dev *vlan = netdev_priv(dev); 1033 struct netpoll *netpoll = vlan->netpoll; 1034 1035 if (!netpoll) 1036 return; 1037 1038 vlan->netpoll = NULL; 1039 1040 __netpoll_free_async(netpoll); 1041 } 1042 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1043 1044 static int macvlan_dev_get_iflink(const struct net_device *dev) 1045 { 1046 struct macvlan_dev *vlan = netdev_priv(dev); 1047 1048 return vlan->lowerdev->ifindex; 1049 } 1050 1051 static const struct ethtool_ops macvlan_ethtool_ops = { 1052 .get_link = ethtool_op_get_link, 1053 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1054 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1055 }; 1056 1057 static const struct net_device_ops macvlan_netdev_ops = { 1058 .ndo_init = macvlan_init, 1059 .ndo_uninit = macvlan_uninit, 1060 .ndo_open = macvlan_open, 1061 .ndo_stop = macvlan_stop, 1062 .ndo_start_xmit = macvlan_start_xmit, 1063 .ndo_change_mtu = macvlan_change_mtu, 1064 .ndo_fix_features = macvlan_fix_features, 1065 .ndo_change_rx_flags = macvlan_change_rx_flags, 1066 .ndo_set_mac_address = macvlan_set_mac_address, 1067 .ndo_set_rx_mode = macvlan_set_mac_lists, 1068 .ndo_get_stats64 = macvlan_dev_get_stats64, 1069 .ndo_validate_addr = eth_validate_addr, 1070 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1071 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1072 .ndo_fdb_add = macvlan_fdb_add, 1073 .ndo_fdb_del = macvlan_fdb_del, 1074 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1075 .ndo_get_lock_subclass = macvlan_get_nest_level, 1076 #ifdef CONFIG_NET_POLL_CONTROLLER 1077 .ndo_poll_controller = macvlan_dev_poll_controller, 1078 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1079 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1080 #endif 1081 .ndo_get_iflink = macvlan_dev_get_iflink, 1082 .ndo_features_check = passthru_features_check, 1083 }; 1084 1085 void macvlan_common_setup(struct net_device *dev) 1086 { 1087 ether_setup(dev); 1088 1089 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1090 netif_keep_dst(dev); 1091 dev->priv_flags |= IFF_UNICAST_FLT; 1092 dev->netdev_ops = &macvlan_netdev_ops; 1093 dev->destructor = free_netdev; 1094 dev->header_ops = &macvlan_hard_header_ops; 1095 dev->ethtool_ops = &macvlan_ethtool_ops; 1096 } 1097 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1098 1099 static void macvlan_setup(struct net_device *dev) 1100 { 1101 macvlan_common_setup(dev); 1102 dev->priv_flags |= IFF_NO_QUEUE; 1103 } 1104 1105 static int macvlan_port_create(struct net_device *dev) 1106 { 1107 struct macvlan_port *port; 1108 unsigned int i; 1109 int err; 1110 1111 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1112 return -EINVAL; 1113 1114 if (netif_is_ipvlan_port(dev)) 1115 return -EBUSY; 1116 1117 port = kzalloc(sizeof(*port), GFP_KERNEL); 1118 if (port == NULL) 1119 return -ENOMEM; 1120 1121 port->passthru = false; 1122 port->dev = dev; 1123 INIT_LIST_HEAD(&port->vlans); 1124 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1125 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1126 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1127 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1128 1129 skb_queue_head_init(&port->bc_queue); 1130 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1131 1132 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1133 if (err) 1134 kfree(port); 1135 else 1136 dev->priv_flags |= IFF_MACVLAN_PORT; 1137 return err; 1138 } 1139 1140 static void macvlan_port_destroy(struct net_device *dev) 1141 { 1142 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1143 1144 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1145 netdev_rx_handler_unregister(dev); 1146 1147 /* After this point, no packet can schedule bc_work anymore, 1148 * but we need to cancel it and purge left skbs if any. 1149 */ 1150 cancel_work_sync(&port->bc_work); 1151 __skb_queue_purge(&port->bc_queue); 1152 1153 kfree_rcu(port, rcu); 1154 } 1155 1156 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 1157 { 1158 if (tb[IFLA_ADDRESS]) { 1159 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1160 return -EINVAL; 1161 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1162 return -EADDRNOTAVAIL; 1163 } 1164 1165 if (data && data[IFLA_MACVLAN_FLAGS] && 1166 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1167 return -EINVAL; 1168 1169 if (data && data[IFLA_MACVLAN_MODE]) { 1170 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1171 case MACVLAN_MODE_PRIVATE: 1172 case MACVLAN_MODE_VEPA: 1173 case MACVLAN_MODE_BRIDGE: 1174 case MACVLAN_MODE_PASSTHRU: 1175 case MACVLAN_MODE_SOURCE: 1176 break; 1177 default: 1178 return -EINVAL; 1179 } 1180 } 1181 1182 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1183 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1184 case MACVLAN_MACADDR_ADD: 1185 case MACVLAN_MACADDR_DEL: 1186 case MACVLAN_MACADDR_FLUSH: 1187 case MACVLAN_MACADDR_SET: 1188 break; 1189 default: 1190 return -EINVAL; 1191 } 1192 } 1193 1194 if (data && data[IFLA_MACVLAN_MACADDR]) { 1195 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1196 return -EINVAL; 1197 1198 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1199 return -EADDRNOTAVAIL; 1200 } 1201 1202 if (data && data[IFLA_MACVLAN_MACADDR_COUNT]) 1203 return -EINVAL; 1204 1205 return 0; 1206 } 1207 1208 /** 1209 * reconfigure list of remote source mac address 1210 * (only for macvlan devices in source mode) 1211 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1212 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1213 */ 1214 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1215 struct nlattr *data[]) 1216 { 1217 char *addr = NULL; 1218 int ret, rem, len; 1219 struct nlattr *nla, *head; 1220 struct macvlan_source_entry *entry; 1221 1222 if (data[IFLA_MACVLAN_MACADDR]) 1223 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1224 1225 if (mode == MACVLAN_MACADDR_ADD) { 1226 if (!addr) 1227 return -EINVAL; 1228 1229 return macvlan_hash_add_source(vlan, addr); 1230 1231 } else if (mode == MACVLAN_MACADDR_DEL) { 1232 if (!addr) 1233 return -EINVAL; 1234 1235 entry = macvlan_hash_lookup_source(vlan, addr); 1236 if (entry) { 1237 macvlan_hash_del_source(entry); 1238 vlan->macaddr_count--; 1239 } 1240 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1241 macvlan_flush_sources(vlan->port, vlan); 1242 } else if (mode == MACVLAN_MACADDR_SET) { 1243 macvlan_flush_sources(vlan->port, vlan); 1244 1245 if (addr) { 1246 ret = macvlan_hash_add_source(vlan, addr); 1247 if (ret) 1248 return ret; 1249 } 1250 1251 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1252 return 0; 1253 1254 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1255 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1256 1257 nla_for_each_attr(nla, head, len, rem) { 1258 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1259 nla_len(nla) != ETH_ALEN) 1260 continue; 1261 1262 addr = nla_data(nla); 1263 ret = macvlan_hash_add_source(vlan, addr); 1264 if (ret) 1265 return ret; 1266 } 1267 } else { 1268 return -EINVAL; 1269 } 1270 1271 return 0; 1272 } 1273 1274 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1275 struct nlattr *tb[], struct nlattr *data[]) 1276 { 1277 struct macvlan_dev *vlan = netdev_priv(dev); 1278 struct macvlan_port *port; 1279 struct net_device *lowerdev; 1280 int err; 1281 int macmode; 1282 bool create = false; 1283 1284 if (!tb[IFLA_LINK]) 1285 return -EINVAL; 1286 1287 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1288 if (lowerdev == NULL) 1289 return -ENODEV; 1290 1291 /* When creating macvlans or macvtaps on top of other macvlans - use 1292 * the real device as the lowerdev. 1293 */ 1294 if (netif_is_macvlan(lowerdev)) 1295 lowerdev = macvlan_dev_real_dev(lowerdev); 1296 1297 if (!tb[IFLA_MTU]) 1298 dev->mtu = lowerdev->mtu; 1299 else if (dev->mtu > lowerdev->mtu) 1300 return -EINVAL; 1301 1302 if (!tb[IFLA_ADDRESS]) 1303 eth_hw_addr_random(dev); 1304 1305 if (!macvlan_port_exists(lowerdev)) { 1306 err = macvlan_port_create(lowerdev); 1307 if (err < 0) 1308 return err; 1309 create = true; 1310 } 1311 port = macvlan_port_get_rtnl(lowerdev); 1312 1313 /* Only 1 macvlan device can be created in passthru mode */ 1314 if (port->passthru) { 1315 /* The macvlan port must be not created this time, 1316 * still goto destroy_macvlan_port for readability. 1317 */ 1318 err = -EINVAL; 1319 goto destroy_macvlan_port; 1320 } 1321 1322 vlan->lowerdev = lowerdev; 1323 vlan->dev = dev; 1324 vlan->port = port; 1325 vlan->set_features = MACVLAN_FEATURES; 1326 vlan->nest_level = dev_get_nest_level(lowerdev) + 1; 1327 1328 vlan->mode = MACVLAN_MODE_VEPA; 1329 if (data && data[IFLA_MACVLAN_MODE]) 1330 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1331 1332 if (data && data[IFLA_MACVLAN_FLAGS]) 1333 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1334 1335 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1336 if (port->count) { 1337 err = -EINVAL; 1338 goto destroy_macvlan_port; 1339 } 1340 port->passthru = true; 1341 eth_hw_addr_inherit(dev, lowerdev); 1342 } 1343 1344 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1345 if (vlan->mode != MACVLAN_MODE_SOURCE) { 1346 err = -EINVAL; 1347 goto destroy_macvlan_port; 1348 } 1349 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1350 err = macvlan_changelink_sources(vlan, macmode, data); 1351 if (err) 1352 goto destroy_macvlan_port; 1353 } 1354 1355 err = register_netdevice(dev); 1356 if (err < 0) 1357 goto destroy_macvlan_port; 1358 1359 dev->priv_flags |= IFF_MACVLAN; 1360 err = netdev_upper_dev_link(lowerdev, dev); 1361 if (err) 1362 goto unregister_netdev; 1363 1364 list_add_tail_rcu(&vlan->list, &port->vlans); 1365 netif_stacked_transfer_operstate(lowerdev, dev); 1366 linkwatch_fire_event(dev); 1367 1368 return 0; 1369 1370 unregister_netdev: 1371 unregister_netdevice(dev); 1372 destroy_macvlan_port: 1373 if (create) 1374 macvlan_port_destroy(port->dev); 1375 return err; 1376 } 1377 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1378 1379 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1380 struct nlattr *tb[], struct nlattr *data[]) 1381 { 1382 return macvlan_common_newlink(src_net, dev, tb, data); 1383 } 1384 1385 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1386 { 1387 struct macvlan_dev *vlan = netdev_priv(dev); 1388 1389 if (vlan->mode == MACVLAN_MODE_SOURCE) 1390 macvlan_flush_sources(vlan->port, vlan); 1391 list_del_rcu(&vlan->list); 1392 unregister_netdevice_queue(dev, head); 1393 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1394 } 1395 EXPORT_SYMBOL_GPL(macvlan_dellink); 1396 1397 static int macvlan_changelink(struct net_device *dev, 1398 struct nlattr *tb[], struct nlattr *data[]) 1399 { 1400 struct macvlan_dev *vlan = netdev_priv(dev); 1401 enum macvlan_mode mode; 1402 bool set_mode = false; 1403 enum macvlan_macaddr_mode macmode; 1404 int ret; 1405 1406 /* Validate mode, but don't set yet: setting flags may fail. */ 1407 if (data && data[IFLA_MACVLAN_MODE]) { 1408 set_mode = true; 1409 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1410 /* Passthrough mode can't be set or cleared dynamically */ 1411 if ((mode == MACVLAN_MODE_PASSTHRU) != 1412 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1413 return -EINVAL; 1414 if (vlan->mode == MACVLAN_MODE_SOURCE && 1415 vlan->mode != mode) 1416 macvlan_flush_sources(vlan->port, vlan); 1417 } 1418 1419 if (data && data[IFLA_MACVLAN_FLAGS]) { 1420 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1421 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1422 if (vlan->port->passthru && promisc) { 1423 int err; 1424 1425 if (flags & MACVLAN_FLAG_NOPROMISC) 1426 err = dev_set_promiscuity(vlan->lowerdev, -1); 1427 else 1428 err = dev_set_promiscuity(vlan->lowerdev, 1); 1429 if (err < 0) 1430 return err; 1431 } 1432 vlan->flags = flags; 1433 } 1434 if (set_mode) 1435 vlan->mode = mode; 1436 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1437 if (vlan->mode != MACVLAN_MODE_SOURCE) 1438 return -EINVAL; 1439 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1440 ret = macvlan_changelink_sources(vlan, macmode, data); 1441 if (ret) 1442 return ret; 1443 } 1444 return 0; 1445 } 1446 1447 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1448 { 1449 if (vlan->macaddr_count == 0) 1450 return 0; 1451 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1452 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1453 } 1454 1455 static size_t macvlan_get_size(const struct net_device *dev) 1456 { 1457 struct macvlan_dev *vlan = netdev_priv(dev); 1458 1459 return (0 1460 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1461 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1462 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1463 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1464 ); 1465 } 1466 1467 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1468 const struct macvlan_dev *vlan, 1469 const int i) 1470 { 1471 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1472 struct macvlan_source_entry *entry; 1473 1474 hlist_for_each_entry_rcu(entry, h, hlist) { 1475 if (entry->vlan != vlan) 1476 continue; 1477 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1478 return 1; 1479 } 1480 return 0; 1481 } 1482 1483 static int macvlan_fill_info(struct sk_buff *skb, 1484 const struct net_device *dev) 1485 { 1486 struct macvlan_dev *vlan = netdev_priv(dev); 1487 int i; 1488 struct nlattr *nest; 1489 1490 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1491 goto nla_put_failure; 1492 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1493 goto nla_put_failure; 1494 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1495 goto nla_put_failure; 1496 if (vlan->macaddr_count > 0) { 1497 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1498 if (nest == NULL) 1499 goto nla_put_failure; 1500 1501 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1502 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1503 goto nla_put_failure; 1504 } 1505 nla_nest_end(skb, nest); 1506 } 1507 return 0; 1508 1509 nla_put_failure: 1510 return -EMSGSIZE; 1511 } 1512 1513 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1514 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1515 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1516 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1517 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1518 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1519 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1520 }; 1521 1522 int macvlan_link_register(struct rtnl_link_ops *ops) 1523 { 1524 /* common fields */ 1525 ops->priv_size = sizeof(struct macvlan_dev); 1526 ops->validate = macvlan_validate; 1527 ops->maxtype = IFLA_MACVLAN_MAX; 1528 ops->policy = macvlan_policy; 1529 ops->changelink = macvlan_changelink; 1530 ops->get_size = macvlan_get_size; 1531 ops->fill_info = macvlan_fill_info; 1532 1533 return rtnl_link_register(ops); 1534 }; 1535 EXPORT_SYMBOL_GPL(macvlan_link_register); 1536 1537 static struct net *macvlan_get_link_net(const struct net_device *dev) 1538 { 1539 return dev_net(macvlan_dev_real_dev(dev)); 1540 } 1541 1542 static struct rtnl_link_ops macvlan_link_ops = { 1543 .kind = "macvlan", 1544 .setup = macvlan_setup, 1545 .newlink = macvlan_newlink, 1546 .dellink = macvlan_dellink, 1547 .get_link_net = macvlan_get_link_net, 1548 }; 1549 1550 static int macvlan_device_event(struct notifier_block *unused, 1551 unsigned long event, void *ptr) 1552 { 1553 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1554 struct macvlan_dev *vlan, *next; 1555 struct macvlan_port *port; 1556 LIST_HEAD(list_kill); 1557 1558 if (!macvlan_port_exists(dev)) 1559 return NOTIFY_DONE; 1560 1561 port = macvlan_port_get_rtnl(dev); 1562 1563 switch (event) { 1564 case NETDEV_UP: 1565 case NETDEV_CHANGE: 1566 list_for_each_entry(vlan, &port->vlans, list) 1567 netif_stacked_transfer_operstate(vlan->lowerdev, 1568 vlan->dev); 1569 break; 1570 case NETDEV_FEAT_CHANGE: 1571 list_for_each_entry(vlan, &port->vlans, list) { 1572 vlan->dev->gso_max_size = dev->gso_max_size; 1573 vlan->dev->gso_max_segs = dev->gso_max_segs; 1574 netdev_update_features(vlan->dev); 1575 } 1576 break; 1577 case NETDEV_CHANGEMTU: 1578 list_for_each_entry(vlan, &port->vlans, list) { 1579 if (vlan->dev->mtu <= dev->mtu) 1580 continue; 1581 dev_set_mtu(vlan->dev, dev->mtu); 1582 } 1583 break; 1584 case NETDEV_CHANGEADDR: 1585 if (!port->passthru) 1586 return NOTIFY_DONE; 1587 1588 vlan = list_first_entry_or_null(&port->vlans, 1589 struct macvlan_dev, 1590 list); 1591 1592 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1593 return NOTIFY_BAD; 1594 1595 break; 1596 case NETDEV_UNREGISTER: 1597 /* twiddle thumbs on netns device moves */ 1598 if (dev->reg_state != NETREG_UNREGISTERING) 1599 break; 1600 1601 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1602 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1603 unregister_netdevice_many(&list_kill); 1604 break; 1605 case NETDEV_PRE_TYPE_CHANGE: 1606 /* Forbid underlaying device to change its type. */ 1607 return NOTIFY_BAD; 1608 1609 case NETDEV_NOTIFY_PEERS: 1610 case NETDEV_BONDING_FAILOVER: 1611 case NETDEV_RESEND_IGMP: 1612 /* Propagate to all vlans */ 1613 list_for_each_entry(vlan, &port->vlans, list) 1614 call_netdevice_notifiers(event, vlan->dev); 1615 } 1616 return NOTIFY_DONE; 1617 } 1618 1619 static struct notifier_block macvlan_notifier_block __read_mostly = { 1620 .notifier_call = macvlan_device_event, 1621 }; 1622 1623 static int __init macvlan_init_module(void) 1624 { 1625 int err; 1626 1627 register_netdevice_notifier(&macvlan_notifier_block); 1628 1629 err = macvlan_link_register(&macvlan_link_ops); 1630 if (err < 0) 1631 goto err1; 1632 return 0; 1633 err1: 1634 unregister_netdevice_notifier(&macvlan_notifier_block); 1635 return err; 1636 } 1637 1638 static void __exit macvlan_cleanup_module(void) 1639 { 1640 rtnl_link_unregister(&macvlan_link_ops); 1641 unregister_netdevice_notifier(&macvlan_notifier_block); 1642 } 1643 1644 module_init(macvlan_init_module); 1645 module_exit(macvlan_cleanup_module); 1646 1647 MODULE_LICENSE("GPL"); 1648 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1649 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1650 MODULE_ALIAS_RTNL_LINK("macvlan"); 1651