1 /* 2 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 of 7 * the License, or (at your option) any later version. 8 * 9 * The code this is based on carried the following copyright notice: 10 * --- 11 * (C) Copyright 2001-2006 12 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com 13 * Re-worked by Ben Greear <greearb@candelatech.com> 14 * --- 15 */ 16 #include <linux/kernel.h> 17 #include <linux/types.h> 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/errno.h> 21 #include <linux/slab.h> 22 #include <linux/string.h> 23 #include <linux/rculist.h> 24 #include <linux/notifier.h> 25 #include <linux/netdevice.h> 26 #include <linux/etherdevice.h> 27 #include <linux/ethtool.h> 28 #include <linux/if_arp.h> 29 #include <linux/if_vlan.h> 30 #include <linux/if_link.h> 31 #include <linux/if_macvlan.h> 32 #include <linux/hash.h> 33 #include <linux/workqueue.h> 34 #include <net/rtnetlink.h> 35 #include <net/xfrm.h> 36 #include <linux/netpoll.h> 37 38 #define MACVLAN_HASH_BITS 8 39 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS) 40 #define MACVLAN_BC_QUEUE_LEN 1000 41 42 struct macvlan_port { 43 struct net_device *dev; 44 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 45 struct list_head vlans; 46 struct rcu_head rcu; 47 struct sk_buff_head bc_queue; 48 struct work_struct bc_work; 49 bool passthru; 50 int count; 51 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE]; 52 }; 53 54 struct macvlan_source_entry { 55 struct hlist_node hlist; 56 struct macvlan_dev *vlan; 57 unsigned char addr[6+2] __aligned(sizeof(u16)); 58 struct rcu_head rcu; 59 }; 60 61 struct macvlan_skb_cb { 62 const struct macvlan_dev *src; 63 }; 64 65 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 66 67 static void macvlan_port_destroy(struct net_device *dev); 68 69 /* Hash Ethernet address */ 70 static u32 macvlan_eth_hash(const unsigned char *addr) 71 { 72 u64 value = get_unaligned((u64 *)addr); 73 74 /* only want 6 bytes */ 75 #ifdef __BIG_ENDIAN 76 value >>= 16; 77 #else 78 value <<= 16; 79 #endif 80 return hash_64(value, MACVLAN_HASH_BITS); 81 } 82 83 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 84 { 85 return rcu_dereference(dev->rx_handler_data); 86 } 87 88 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 89 { 90 return rtnl_dereference(dev->rx_handler_data); 91 } 92 93 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 94 95 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 96 const unsigned char *addr) 97 { 98 struct macvlan_dev *vlan; 99 u32 idx = macvlan_eth_hash(addr); 100 101 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) { 102 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 103 return vlan; 104 } 105 return NULL; 106 } 107 108 static struct macvlan_source_entry *macvlan_hash_lookup_source( 109 const struct macvlan_dev *vlan, 110 const unsigned char *addr) 111 { 112 struct macvlan_source_entry *entry; 113 u32 idx = macvlan_eth_hash(addr); 114 struct hlist_head *h = &vlan->port->vlan_source_hash[idx]; 115 116 hlist_for_each_entry_rcu(entry, h, hlist) { 117 if (ether_addr_equal_64bits(entry->addr, addr) && 118 entry->vlan == vlan) 119 return entry; 120 } 121 return NULL; 122 } 123 124 static int macvlan_hash_add_source(struct macvlan_dev *vlan, 125 const unsigned char *addr) 126 { 127 struct macvlan_port *port = vlan->port; 128 struct macvlan_source_entry *entry; 129 struct hlist_head *h; 130 131 entry = macvlan_hash_lookup_source(vlan, addr); 132 if (entry) 133 return 0; 134 135 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 136 if (!entry) 137 return -ENOMEM; 138 139 ether_addr_copy(entry->addr, addr); 140 entry->vlan = vlan; 141 h = &port->vlan_source_hash[macvlan_eth_hash(addr)]; 142 hlist_add_head_rcu(&entry->hlist, h); 143 vlan->macaddr_count++; 144 145 return 0; 146 } 147 148 static void macvlan_hash_add(struct macvlan_dev *vlan) 149 { 150 struct macvlan_port *port = vlan->port; 151 const unsigned char *addr = vlan->dev->dev_addr; 152 u32 idx = macvlan_eth_hash(addr); 153 154 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]); 155 } 156 157 static void macvlan_hash_del_source(struct macvlan_source_entry *entry) 158 { 159 hlist_del_rcu(&entry->hlist); 160 kfree_rcu(entry, rcu); 161 } 162 163 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 164 { 165 hlist_del_rcu(&vlan->hlist); 166 if (sync) 167 synchronize_rcu(); 168 } 169 170 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 171 const unsigned char *addr) 172 { 173 macvlan_hash_del(vlan, true); 174 /* Now that we are unhashed it is safe to change the device 175 * address without confusing packet delivery. 176 */ 177 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 178 macvlan_hash_add(vlan); 179 } 180 181 static int macvlan_addr_busy(const struct macvlan_port *port, 182 const unsigned char *addr) 183 { 184 /* Test to see if the specified multicast address is 185 * currently in use by the underlying device or 186 * another macvlan. 187 */ 188 if (ether_addr_equal_64bits(port->dev->dev_addr, addr)) 189 return 1; 190 191 if (macvlan_hash_lookup(port, addr)) 192 return 1; 193 194 return 0; 195 } 196 197 198 static int macvlan_broadcast_one(struct sk_buff *skb, 199 const struct macvlan_dev *vlan, 200 const struct ethhdr *eth, bool local) 201 { 202 struct net_device *dev = vlan->dev; 203 204 if (local) 205 return __dev_forward_skb(dev, skb); 206 207 skb->dev = dev; 208 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 209 skb->pkt_type = PACKET_BROADCAST; 210 else 211 skb->pkt_type = PACKET_MULTICAST; 212 213 return 0; 214 } 215 216 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 217 { 218 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 219 } 220 221 222 static unsigned int mc_hash(const struct macvlan_dev *vlan, 223 const unsigned char *addr) 224 { 225 u32 val = __get_unaligned_cpu32(addr + 2); 226 227 val ^= macvlan_hash_mix(vlan); 228 return hash_32(val, MACVLAN_MC_FILTER_BITS); 229 } 230 231 static void macvlan_broadcast(struct sk_buff *skb, 232 const struct macvlan_port *port, 233 struct net_device *src, 234 enum macvlan_mode mode) 235 { 236 const struct ethhdr *eth = eth_hdr(skb); 237 const struct macvlan_dev *vlan; 238 struct sk_buff *nskb; 239 unsigned int i; 240 int err; 241 unsigned int hash; 242 243 if (skb->protocol == htons(ETH_P_PAUSE)) 244 return; 245 246 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 247 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 248 if (vlan->dev == src || !(vlan->mode & mode)) 249 continue; 250 251 hash = mc_hash(vlan, eth->h_dest); 252 if (!test_bit(hash, vlan->mc_filter)) 253 continue; 254 255 err = NET_RX_DROP; 256 nskb = skb_clone(skb, GFP_ATOMIC); 257 if (likely(nskb)) 258 err = macvlan_broadcast_one( 259 nskb, vlan, eth, 260 mode == MACVLAN_MODE_BRIDGE) ?: 261 netif_rx_ni(nskb); 262 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 263 err == NET_RX_SUCCESS, 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 kfree_skb(skb); 309 } 310 } 311 312 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 313 struct sk_buff *skb) 314 { 315 struct sk_buff *nskb; 316 int err = -ENOMEM; 317 318 nskb = skb_clone(skb, GFP_ATOMIC); 319 if (!nskb) 320 goto err; 321 322 spin_lock(&port->bc_queue.lock); 323 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) { 324 __skb_queue_tail(&port->bc_queue, nskb); 325 err = 0; 326 } 327 spin_unlock(&port->bc_queue.lock); 328 329 if (err) 330 goto free_nskb; 331 332 schedule_work(&port->bc_work); 333 return; 334 335 free_nskb: 336 kfree_skb(nskb); 337 err: 338 atomic_long_inc(&skb->dev->rx_dropped); 339 } 340 341 static void macvlan_flush_sources(struct macvlan_port *port, 342 struct macvlan_dev *vlan) 343 { 344 int i; 345 346 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 347 struct hlist_node *h, *n; 348 349 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) { 350 struct macvlan_source_entry *entry; 351 352 entry = hlist_entry(h, struct macvlan_source_entry, 353 hlist); 354 if (entry->vlan == vlan) 355 macvlan_hash_del_source(entry); 356 } 357 } 358 vlan->macaddr_count = 0; 359 } 360 361 static void macvlan_forward_source_one(struct sk_buff *skb, 362 struct macvlan_dev *vlan) 363 { 364 struct sk_buff *nskb; 365 struct net_device *dev; 366 int len; 367 int ret; 368 369 dev = vlan->dev; 370 if (unlikely(!(dev->flags & IFF_UP))) 371 return; 372 373 nskb = skb_clone(skb, GFP_ATOMIC); 374 if (!nskb) 375 return; 376 377 len = nskb->len + ETH_HLEN; 378 nskb->dev = dev; 379 nskb->pkt_type = PACKET_HOST; 380 381 ret = netif_rx(nskb); 382 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 383 } 384 385 static void macvlan_forward_source(struct sk_buff *skb, 386 struct macvlan_port *port, 387 const unsigned char *addr) 388 { 389 struct macvlan_source_entry *entry; 390 u32 idx = macvlan_eth_hash(addr); 391 struct hlist_head *h = &port->vlan_source_hash[idx]; 392 393 hlist_for_each_entry_rcu(entry, h, hlist) { 394 if (ether_addr_equal_64bits(entry->addr, addr)) 395 if (entry->vlan->dev->flags & IFF_UP) 396 macvlan_forward_source_one(skb, entry->vlan); 397 } 398 } 399 400 /* called under rcu_read_lock() from netif_receive_skb */ 401 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 402 { 403 struct macvlan_port *port; 404 struct sk_buff *skb = *pskb; 405 const struct ethhdr *eth = eth_hdr(skb); 406 const struct macvlan_dev *vlan; 407 const struct macvlan_dev *src; 408 struct net_device *dev; 409 unsigned int len = 0; 410 int ret; 411 rx_handler_result_t handle_res; 412 413 port = macvlan_port_get_rcu(skb->dev); 414 if (is_multicast_ether_addr(eth->h_dest)) { 415 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN); 416 if (!skb) 417 return RX_HANDLER_CONSUMED; 418 eth = eth_hdr(skb); 419 macvlan_forward_source(skb, port, eth->h_source); 420 src = macvlan_hash_lookup(port, eth->h_source); 421 if (src && src->mode != MACVLAN_MODE_VEPA && 422 src->mode != MACVLAN_MODE_BRIDGE) { 423 /* forward to original port. */ 424 vlan = src; 425 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 426 netif_rx(skb); 427 handle_res = RX_HANDLER_CONSUMED; 428 goto out; 429 } 430 431 MACVLAN_SKB_CB(skb)->src = src; 432 macvlan_broadcast_enqueue(port, skb); 433 434 return RX_HANDLER_PASS; 435 } 436 437 macvlan_forward_source(skb, port, eth->h_source); 438 if (port->passthru) 439 vlan = list_first_or_null_rcu(&port->vlans, 440 struct macvlan_dev, list); 441 else 442 vlan = macvlan_hash_lookup(port, eth->h_dest); 443 if (vlan == NULL) 444 return RX_HANDLER_PASS; 445 446 dev = vlan->dev; 447 if (unlikely(!(dev->flags & IFF_UP))) { 448 kfree_skb(skb); 449 return RX_HANDLER_CONSUMED; 450 } 451 len = skb->len + ETH_HLEN; 452 skb = skb_share_check(skb, GFP_ATOMIC); 453 if (!skb) { 454 ret = NET_RX_DROP; 455 handle_res = RX_HANDLER_CONSUMED; 456 goto out; 457 } 458 459 skb->dev = dev; 460 skb->pkt_type = PACKET_HOST; 461 462 ret = NET_RX_SUCCESS; 463 handle_res = RX_HANDLER_ANOTHER; 464 out: 465 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 466 return handle_res; 467 } 468 469 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 470 { 471 const struct macvlan_dev *vlan = netdev_priv(dev); 472 const struct macvlan_port *port = vlan->port; 473 const struct macvlan_dev *dest; 474 475 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 476 const struct ethhdr *eth = (void *)skb->data; 477 478 /* send to other bridge ports directly */ 479 if (is_multicast_ether_addr(eth->h_dest)) { 480 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 481 goto xmit_world; 482 } 483 484 dest = macvlan_hash_lookup(port, eth->h_dest); 485 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 486 /* send to lowerdev first for its network taps */ 487 dev_forward_skb(vlan->lowerdev, skb); 488 489 return NET_XMIT_SUCCESS; 490 } 491 } 492 493 xmit_world: 494 skb->dev = vlan->lowerdev; 495 return dev_queue_xmit(skb); 496 } 497 498 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 499 { 500 #ifdef CONFIG_NET_POLL_CONTROLLER 501 if (vlan->netpoll) 502 netpoll_send_skb(vlan->netpoll, skb); 503 #else 504 BUG(); 505 #endif 506 return NETDEV_TX_OK; 507 } 508 509 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 510 struct net_device *dev) 511 { 512 unsigned int len = skb->len; 513 int ret; 514 struct macvlan_dev *vlan = netdev_priv(dev); 515 516 if (unlikely(netpoll_tx_running(dev))) 517 return macvlan_netpoll_send_skb(vlan, skb); 518 519 if (vlan->fwd_priv) { 520 skb->dev = vlan->lowerdev; 521 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); 522 } else { 523 ret = macvlan_queue_xmit(skb, dev); 524 } 525 526 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 527 struct vlan_pcpu_stats *pcpu_stats; 528 529 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 530 u64_stats_update_begin(&pcpu_stats->syncp); 531 pcpu_stats->tx_packets++; 532 pcpu_stats->tx_bytes += len; 533 u64_stats_update_end(&pcpu_stats->syncp); 534 } else { 535 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 536 } 537 return ret; 538 } 539 540 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 541 unsigned short type, const void *daddr, 542 const void *saddr, unsigned len) 543 { 544 const struct macvlan_dev *vlan = netdev_priv(dev); 545 struct net_device *lowerdev = vlan->lowerdev; 546 547 return dev_hard_header(skb, lowerdev, type, daddr, 548 saddr ? : dev->dev_addr, len); 549 } 550 551 static const struct header_ops macvlan_hard_header_ops = { 552 .create = macvlan_hard_header, 553 .rebuild = eth_rebuild_header, 554 .parse = eth_header_parse, 555 .cache = eth_header_cache, 556 .cache_update = eth_header_cache_update, 557 }; 558 559 static struct rtnl_link_ops macvlan_link_ops; 560 561 static int macvlan_open(struct net_device *dev) 562 { 563 struct macvlan_dev *vlan = netdev_priv(dev); 564 struct net_device *lowerdev = vlan->lowerdev; 565 int err; 566 567 if (vlan->port->passthru) { 568 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 569 err = dev_set_promiscuity(lowerdev, 1); 570 if (err < 0) 571 goto out; 572 } 573 goto hash_add; 574 } 575 576 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && 577 dev->rtnl_link_ops == &macvlan_link_ops) { 578 vlan->fwd_priv = 579 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 580 581 /* If we get a NULL pointer back, or if we get an error 582 * then we should just fall through to the non accelerated path 583 */ 584 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 585 vlan->fwd_priv = NULL; 586 } else 587 return 0; 588 } 589 590 err = -EBUSY; 591 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 592 goto out; 593 594 err = dev_uc_add(lowerdev, dev->dev_addr); 595 if (err < 0) 596 goto out; 597 if (dev->flags & IFF_ALLMULTI) { 598 err = dev_set_allmulti(lowerdev, 1); 599 if (err < 0) 600 goto del_unicast; 601 } 602 603 hash_add: 604 macvlan_hash_add(vlan); 605 return 0; 606 607 del_unicast: 608 dev_uc_del(lowerdev, dev->dev_addr); 609 out: 610 if (vlan->fwd_priv) { 611 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 612 vlan->fwd_priv); 613 vlan->fwd_priv = NULL; 614 } 615 return err; 616 } 617 618 static int macvlan_stop(struct net_device *dev) 619 { 620 struct macvlan_dev *vlan = netdev_priv(dev); 621 struct net_device *lowerdev = vlan->lowerdev; 622 623 if (vlan->fwd_priv) { 624 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 625 vlan->fwd_priv); 626 vlan->fwd_priv = NULL; 627 return 0; 628 } 629 630 dev_uc_unsync(lowerdev, dev); 631 dev_mc_unsync(lowerdev, dev); 632 633 if (vlan->port->passthru) { 634 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 635 dev_set_promiscuity(lowerdev, -1); 636 goto hash_del; 637 } 638 639 if (dev->flags & IFF_ALLMULTI) 640 dev_set_allmulti(lowerdev, -1); 641 642 dev_uc_del(lowerdev, dev->dev_addr); 643 644 hash_del: 645 macvlan_hash_del(vlan, !dev->dismantle); 646 return 0; 647 } 648 649 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 650 { 651 struct macvlan_dev *vlan = netdev_priv(dev); 652 struct net_device *lowerdev = vlan->lowerdev; 653 int err; 654 655 if (!(dev->flags & IFF_UP)) { 656 /* Just copy in the new address */ 657 ether_addr_copy(dev->dev_addr, addr); 658 } else { 659 /* Rehash and update the device filters */ 660 if (macvlan_addr_busy(vlan->port, addr)) 661 return -EBUSY; 662 663 if (!vlan->port->passthru) { 664 err = dev_uc_add(lowerdev, addr); 665 if (err) 666 return err; 667 668 dev_uc_del(lowerdev, dev->dev_addr); 669 } 670 671 macvlan_hash_change_addr(vlan, addr); 672 } 673 return 0; 674 } 675 676 static int macvlan_set_mac_address(struct net_device *dev, void *p) 677 { 678 struct macvlan_dev *vlan = netdev_priv(dev); 679 struct sockaddr *addr = p; 680 681 if (!is_valid_ether_addr(addr->sa_data)) 682 return -EADDRNOTAVAIL; 683 684 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 685 dev_set_mac_address(vlan->lowerdev, addr); 686 return 0; 687 } 688 689 return macvlan_sync_address(dev, addr->sa_data); 690 } 691 692 static void macvlan_change_rx_flags(struct net_device *dev, int change) 693 { 694 struct macvlan_dev *vlan = netdev_priv(dev); 695 struct net_device *lowerdev = vlan->lowerdev; 696 697 if (dev->flags & IFF_UP) { 698 if (change & IFF_ALLMULTI) 699 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 700 } 701 } 702 703 static void macvlan_set_mac_lists(struct net_device *dev) 704 { 705 struct macvlan_dev *vlan = netdev_priv(dev); 706 707 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 708 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); 709 } else { 710 struct netdev_hw_addr *ha; 711 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 712 713 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 714 netdev_for_each_mc_addr(ha, dev) { 715 __set_bit(mc_hash(vlan, ha->addr), filter); 716 } 717 718 __set_bit(mc_hash(vlan, dev->broadcast), filter); 719 720 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); 721 } 722 dev_uc_sync(vlan->lowerdev, dev); 723 dev_mc_sync(vlan->lowerdev, dev); 724 } 725 726 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 727 { 728 struct macvlan_dev *vlan = netdev_priv(dev); 729 730 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 731 return -EINVAL; 732 dev->mtu = new_mtu; 733 return 0; 734 } 735 736 /* 737 * macvlan network devices have devices nesting below it and are a special 738 * "super class" of normal network devices; split their locks off into a 739 * separate class since they always nest. 740 */ 741 static struct lock_class_key macvlan_netdev_xmit_lock_key; 742 static struct lock_class_key macvlan_netdev_addr_lock_key; 743 744 #define ALWAYS_ON_FEATURES \ 745 (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX) 746 747 #define MACVLAN_FEATURES \ 748 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 749 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 750 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 751 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 752 753 #define MACVLAN_STATE_MASK \ 754 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 755 756 static int macvlan_get_nest_level(struct net_device *dev) 757 { 758 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 759 } 760 761 static void macvlan_set_lockdep_class_one(struct net_device *dev, 762 struct netdev_queue *txq, 763 void *_unused) 764 { 765 lockdep_set_class(&txq->_xmit_lock, 766 &macvlan_netdev_xmit_lock_key); 767 } 768 769 static void macvlan_set_lockdep_class(struct net_device *dev) 770 { 771 lockdep_set_class_and_subclass(&dev->addr_list_lock, 772 &macvlan_netdev_addr_lock_key, 773 macvlan_get_nest_level(dev)); 774 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); 775 } 776 777 static int macvlan_init(struct net_device *dev) 778 { 779 struct macvlan_dev *vlan = netdev_priv(dev); 780 const struct net_device *lowerdev = vlan->lowerdev; 781 782 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 783 (lowerdev->state & MACVLAN_STATE_MASK); 784 dev->features = lowerdev->features & MACVLAN_FEATURES; 785 dev->features |= ALWAYS_ON_FEATURES; 786 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 787 dev->gso_max_size = lowerdev->gso_max_size; 788 dev->iflink = lowerdev->ifindex; 789 dev->hard_header_len = lowerdev->hard_header_len; 790 791 macvlan_set_lockdep_class(dev); 792 793 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 794 if (!vlan->pcpu_stats) 795 return -ENOMEM; 796 797 return 0; 798 } 799 800 static void macvlan_uninit(struct net_device *dev) 801 { 802 struct macvlan_dev *vlan = netdev_priv(dev); 803 struct macvlan_port *port = vlan->port; 804 805 free_percpu(vlan->pcpu_stats); 806 807 macvlan_flush_sources(port, vlan); 808 port->count -= 1; 809 if (!port->count) 810 macvlan_port_destroy(port->dev); 811 } 812 813 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, 814 struct rtnl_link_stats64 *stats) 815 { 816 struct macvlan_dev *vlan = netdev_priv(dev); 817 818 if (vlan->pcpu_stats) { 819 struct vlan_pcpu_stats *p; 820 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 821 u32 rx_errors = 0, tx_dropped = 0; 822 unsigned int start; 823 int i; 824 825 for_each_possible_cpu(i) { 826 p = per_cpu_ptr(vlan->pcpu_stats, i); 827 do { 828 start = u64_stats_fetch_begin_irq(&p->syncp); 829 rx_packets = p->rx_packets; 830 rx_bytes = p->rx_bytes; 831 rx_multicast = p->rx_multicast; 832 tx_packets = p->tx_packets; 833 tx_bytes = p->tx_bytes; 834 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 835 836 stats->rx_packets += rx_packets; 837 stats->rx_bytes += rx_bytes; 838 stats->multicast += rx_multicast; 839 stats->tx_packets += tx_packets; 840 stats->tx_bytes += tx_bytes; 841 /* rx_errors & tx_dropped are u32, updated 842 * without syncp protection. 843 */ 844 rx_errors += p->rx_errors; 845 tx_dropped += p->tx_dropped; 846 } 847 stats->rx_errors = rx_errors; 848 stats->rx_dropped = rx_errors; 849 stats->tx_dropped = tx_dropped; 850 } 851 return stats; 852 } 853 854 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 855 __be16 proto, u16 vid) 856 { 857 struct macvlan_dev *vlan = netdev_priv(dev); 858 struct net_device *lowerdev = vlan->lowerdev; 859 860 return vlan_vid_add(lowerdev, proto, vid); 861 } 862 863 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 864 __be16 proto, u16 vid) 865 { 866 struct macvlan_dev *vlan = netdev_priv(dev); 867 struct net_device *lowerdev = vlan->lowerdev; 868 869 vlan_vid_del(lowerdev, proto, vid); 870 return 0; 871 } 872 873 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 874 struct net_device *dev, 875 const unsigned char *addr, 876 u16 flags) 877 { 878 struct macvlan_dev *vlan = netdev_priv(dev); 879 int err = -EINVAL; 880 881 /* Support unicast filter only on passthru devices. 882 * Multicast filter should be allowed on all devices. 883 */ 884 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 885 return -EOPNOTSUPP; 886 887 if (flags & NLM_F_REPLACE) 888 return -EOPNOTSUPP; 889 890 if (is_unicast_ether_addr(addr)) 891 err = dev_uc_add_excl(dev, addr); 892 else if (is_multicast_ether_addr(addr)) 893 err = dev_mc_add_excl(dev, addr); 894 895 return err; 896 } 897 898 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 899 struct net_device *dev, 900 const unsigned char *addr) 901 { 902 struct macvlan_dev *vlan = netdev_priv(dev); 903 int err = -EINVAL; 904 905 /* Support unicast filter only on passthru devices. 906 * Multicast filter should be allowed on all devices. 907 */ 908 if (!vlan->port->passthru && is_unicast_ether_addr(addr)) 909 return -EOPNOTSUPP; 910 911 if (is_unicast_ether_addr(addr)) 912 err = dev_uc_del(dev, addr); 913 else if (is_multicast_ether_addr(addr)) 914 err = dev_mc_del(dev, addr); 915 916 return err; 917 } 918 919 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 920 struct ethtool_drvinfo *drvinfo) 921 { 922 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 923 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 924 } 925 926 static int macvlan_ethtool_get_settings(struct net_device *dev, 927 struct ethtool_cmd *cmd) 928 { 929 const struct macvlan_dev *vlan = netdev_priv(dev); 930 931 return __ethtool_get_settings(vlan->lowerdev, cmd); 932 } 933 934 static netdev_features_t macvlan_fix_features(struct net_device *dev, 935 netdev_features_t features) 936 { 937 struct macvlan_dev *vlan = netdev_priv(dev); 938 netdev_features_t mask; 939 940 features |= NETIF_F_ALL_FOR_ALL; 941 features &= (vlan->set_features | ~MACVLAN_FEATURES); 942 mask = features; 943 944 features = netdev_increment_features(vlan->lowerdev->features, 945 features, 946 mask); 947 features |= ALWAYS_ON_FEATURES; 948 features &= ~NETIF_F_NETNS_LOCAL; 949 950 return features; 951 } 952 953 #ifdef CONFIG_NET_POLL_CONTROLLER 954 static void macvlan_dev_poll_controller(struct net_device *dev) 955 { 956 return; 957 } 958 959 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 960 { 961 struct macvlan_dev *vlan = netdev_priv(dev); 962 struct net_device *real_dev = vlan->lowerdev; 963 struct netpoll *netpoll; 964 int err = 0; 965 966 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 967 err = -ENOMEM; 968 if (!netpoll) 969 goto out; 970 971 err = __netpoll_setup(netpoll, real_dev); 972 if (err) { 973 kfree(netpoll); 974 goto out; 975 } 976 977 vlan->netpoll = netpoll; 978 979 out: 980 return err; 981 } 982 983 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 984 { 985 struct macvlan_dev *vlan = netdev_priv(dev); 986 struct netpoll *netpoll = vlan->netpoll; 987 988 if (!netpoll) 989 return; 990 991 vlan->netpoll = NULL; 992 993 __netpoll_free_async(netpoll); 994 } 995 #endif /* CONFIG_NET_POLL_CONTROLLER */ 996 997 static const struct ethtool_ops macvlan_ethtool_ops = { 998 .get_link = ethtool_op_get_link, 999 .get_settings = macvlan_ethtool_get_settings, 1000 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1001 }; 1002 1003 static const struct net_device_ops macvlan_netdev_ops = { 1004 .ndo_init = macvlan_init, 1005 .ndo_uninit = macvlan_uninit, 1006 .ndo_open = macvlan_open, 1007 .ndo_stop = macvlan_stop, 1008 .ndo_start_xmit = macvlan_start_xmit, 1009 .ndo_change_mtu = macvlan_change_mtu, 1010 .ndo_fix_features = macvlan_fix_features, 1011 .ndo_change_rx_flags = macvlan_change_rx_flags, 1012 .ndo_set_mac_address = macvlan_set_mac_address, 1013 .ndo_set_rx_mode = macvlan_set_mac_lists, 1014 .ndo_get_stats64 = macvlan_dev_get_stats64, 1015 .ndo_validate_addr = eth_validate_addr, 1016 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1017 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1018 .ndo_fdb_add = macvlan_fdb_add, 1019 .ndo_fdb_del = macvlan_fdb_del, 1020 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1021 .ndo_get_lock_subclass = macvlan_get_nest_level, 1022 #ifdef CONFIG_NET_POLL_CONTROLLER 1023 .ndo_poll_controller = macvlan_dev_poll_controller, 1024 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1025 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1026 #endif 1027 }; 1028 1029 void macvlan_common_setup(struct net_device *dev) 1030 { 1031 ether_setup(dev); 1032 1033 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1034 netif_keep_dst(dev); 1035 dev->priv_flags |= IFF_UNICAST_FLT; 1036 dev->netdev_ops = &macvlan_netdev_ops; 1037 dev->destructor = free_netdev; 1038 dev->header_ops = &macvlan_hard_header_ops; 1039 dev->ethtool_ops = &macvlan_ethtool_ops; 1040 } 1041 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1042 1043 static void macvlan_setup(struct net_device *dev) 1044 { 1045 macvlan_common_setup(dev); 1046 dev->tx_queue_len = 0; 1047 } 1048 1049 static int macvlan_port_create(struct net_device *dev) 1050 { 1051 struct macvlan_port *port; 1052 unsigned int i; 1053 int err; 1054 1055 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1056 return -EINVAL; 1057 1058 port = kzalloc(sizeof(*port), GFP_KERNEL); 1059 if (port == NULL) 1060 return -ENOMEM; 1061 1062 port->passthru = false; 1063 port->dev = dev; 1064 INIT_LIST_HEAD(&port->vlans); 1065 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1066 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1067 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1068 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1069 1070 skb_queue_head_init(&port->bc_queue); 1071 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1072 1073 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1074 if (err) 1075 kfree(port); 1076 else 1077 dev->priv_flags |= IFF_MACVLAN_PORT; 1078 return err; 1079 } 1080 1081 static void macvlan_port_destroy(struct net_device *dev) 1082 { 1083 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1084 1085 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1086 netdev_rx_handler_unregister(dev); 1087 1088 /* After this point, no packet can schedule bc_work anymore, 1089 * but we need to cancel it and purge left skbs if any. 1090 */ 1091 cancel_work_sync(&port->bc_work); 1092 __skb_queue_purge(&port->bc_queue); 1093 1094 kfree_rcu(port, rcu); 1095 } 1096 1097 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 1098 { 1099 if (tb[IFLA_ADDRESS]) { 1100 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1101 return -EINVAL; 1102 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1103 return -EADDRNOTAVAIL; 1104 } 1105 1106 if (data && data[IFLA_MACVLAN_FLAGS] && 1107 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1108 return -EINVAL; 1109 1110 if (data && data[IFLA_MACVLAN_MODE]) { 1111 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1112 case MACVLAN_MODE_PRIVATE: 1113 case MACVLAN_MODE_VEPA: 1114 case MACVLAN_MODE_BRIDGE: 1115 case MACVLAN_MODE_PASSTHRU: 1116 case MACVLAN_MODE_SOURCE: 1117 break; 1118 default: 1119 return -EINVAL; 1120 } 1121 } 1122 1123 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1124 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1125 case MACVLAN_MACADDR_ADD: 1126 case MACVLAN_MACADDR_DEL: 1127 case MACVLAN_MACADDR_FLUSH: 1128 case MACVLAN_MACADDR_SET: 1129 break; 1130 default: 1131 return -EINVAL; 1132 } 1133 } 1134 1135 if (data && data[IFLA_MACVLAN_MACADDR]) { 1136 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1137 return -EINVAL; 1138 1139 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1140 return -EADDRNOTAVAIL; 1141 } 1142 1143 if (data && data[IFLA_MACVLAN_MACADDR_COUNT]) 1144 return -EINVAL; 1145 1146 return 0; 1147 } 1148 1149 /** 1150 * reconfigure list of remote source mac address 1151 * (only for macvlan devices in source mode) 1152 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1153 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1154 */ 1155 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1156 struct nlattr *data[]) 1157 { 1158 char *addr = NULL; 1159 int ret, rem, len; 1160 struct nlattr *nla, *head; 1161 struct macvlan_source_entry *entry; 1162 1163 if (data[IFLA_MACVLAN_MACADDR]) 1164 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1165 1166 if (mode == MACVLAN_MACADDR_ADD) { 1167 if (!addr) 1168 return -EINVAL; 1169 1170 return macvlan_hash_add_source(vlan, addr); 1171 1172 } else if (mode == MACVLAN_MACADDR_DEL) { 1173 if (!addr) 1174 return -EINVAL; 1175 1176 entry = macvlan_hash_lookup_source(vlan, addr); 1177 if (entry) { 1178 macvlan_hash_del_source(entry); 1179 vlan->macaddr_count--; 1180 } 1181 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1182 macvlan_flush_sources(vlan->port, vlan); 1183 } else if (mode == MACVLAN_MACADDR_SET) { 1184 macvlan_flush_sources(vlan->port, vlan); 1185 1186 if (addr) { 1187 ret = macvlan_hash_add_source(vlan, addr); 1188 if (ret) 1189 return ret; 1190 } 1191 1192 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1193 return 0; 1194 1195 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1196 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1197 1198 nla_for_each_attr(nla, head, len, rem) { 1199 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1200 nla_len(nla) != ETH_ALEN) 1201 continue; 1202 1203 addr = nla_data(nla); 1204 ret = macvlan_hash_add_source(vlan, addr); 1205 if (ret) 1206 return ret; 1207 } 1208 } else { 1209 return -EINVAL; 1210 } 1211 1212 return 0; 1213 } 1214 1215 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1216 struct nlattr *tb[], struct nlattr *data[]) 1217 { 1218 struct macvlan_dev *vlan = netdev_priv(dev); 1219 struct macvlan_port *port; 1220 struct net_device *lowerdev; 1221 int err; 1222 int macmode; 1223 1224 if (!tb[IFLA_LINK]) 1225 return -EINVAL; 1226 1227 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1228 if (lowerdev == NULL) 1229 return -ENODEV; 1230 1231 /* When creating macvlans or macvtaps on top of other macvlans - use 1232 * the real device as the lowerdev. 1233 */ 1234 if (netif_is_macvlan(lowerdev)) 1235 lowerdev = macvlan_dev_real_dev(lowerdev); 1236 1237 if (!tb[IFLA_MTU]) 1238 dev->mtu = lowerdev->mtu; 1239 else if (dev->mtu > lowerdev->mtu) 1240 return -EINVAL; 1241 1242 if (!tb[IFLA_ADDRESS]) 1243 eth_hw_addr_random(dev); 1244 1245 if (!macvlan_port_exists(lowerdev)) { 1246 err = macvlan_port_create(lowerdev); 1247 if (err < 0) 1248 return err; 1249 } 1250 port = macvlan_port_get_rtnl(lowerdev); 1251 1252 /* Only 1 macvlan device can be created in passthru mode */ 1253 if (port->passthru) 1254 return -EINVAL; 1255 1256 vlan->lowerdev = lowerdev; 1257 vlan->dev = dev; 1258 vlan->port = port; 1259 vlan->set_features = MACVLAN_FEATURES; 1260 vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1; 1261 1262 vlan->mode = MACVLAN_MODE_VEPA; 1263 if (data && data[IFLA_MACVLAN_MODE]) 1264 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1265 1266 if (data && data[IFLA_MACVLAN_FLAGS]) 1267 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1268 1269 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1270 if (port->count) 1271 return -EINVAL; 1272 port->passthru = true; 1273 eth_hw_addr_inherit(dev, lowerdev); 1274 } 1275 1276 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1277 if (vlan->mode != MACVLAN_MODE_SOURCE) 1278 return -EINVAL; 1279 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1280 err = macvlan_changelink_sources(vlan, macmode, data); 1281 if (err) 1282 return err; 1283 } 1284 1285 port->count += 1; 1286 err = register_netdevice(dev); 1287 if (err < 0) 1288 goto destroy_port; 1289 1290 dev->priv_flags |= IFF_MACVLAN; 1291 err = netdev_upper_dev_link(lowerdev, dev); 1292 if (err) 1293 goto unregister_netdev; 1294 1295 list_add_tail_rcu(&vlan->list, &port->vlans); 1296 netif_stacked_transfer_operstate(lowerdev, dev); 1297 1298 return 0; 1299 1300 unregister_netdev: 1301 unregister_netdevice(dev); 1302 destroy_port: 1303 port->count -= 1; 1304 if (!port->count) 1305 macvlan_port_destroy(lowerdev); 1306 1307 return err; 1308 } 1309 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1310 1311 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1312 struct nlattr *tb[], struct nlattr *data[]) 1313 { 1314 return macvlan_common_newlink(src_net, dev, tb, data); 1315 } 1316 1317 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1318 { 1319 struct macvlan_dev *vlan = netdev_priv(dev); 1320 1321 if (vlan->mode == MACVLAN_MODE_SOURCE) 1322 macvlan_flush_sources(vlan->port, vlan); 1323 list_del_rcu(&vlan->list); 1324 unregister_netdevice_queue(dev, head); 1325 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1326 } 1327 EXPORT_SYMBOL_GPL(macvlan_dellink); 1328 1329 static int macvlan_changelink(struct net_device *dev, 1330 struct nlattr *tb[], struct nlattr *data[]) 1331 { 1332 struct macvlan_dev *vlan = netdev_priv(dev); 1333 enum macvlan_mode mode; 1334 bool set_mode = false; 1335 enum macvlan_macaddr_mode macmode; 1336 int ret; 1337 1338 /* Validate mode, but don't set yet: setting flags may fail. */ 1339 if (data && data[IFLA_MACVLAN_MODE]) { 1340 set_mode = true; 1341 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1342 /* Passthrough mode can't be set or cleared dynamically */ 1343 if ((mode == MACVLAN_MODE_PASSTHRU) != 1344 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1345 return -EINVAL; 1346 if (vlan->mode == MACVLAN_MODE_SOURCE && 1347 vlan->mode != mode) 1348 macvlan_flush_sources(vlan->port, vlan); 1349 } 1350 1351 if (data && data[IFLA_MACVLAN_FLAGS]) { 1352 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1353 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1354 if (vlan->port->passthru && promisc) { 1355 int err; 1356 1357 if (flags & MACVLAN_FLAG_NOPROMISC) 1358 err = dev_set_promiscuity(vlan->lowerdev, -1); 1359 else 1360 err = dev_set_promiscuity(vlan->lowerdev, 1); 1361 if (err < 0) 1362 return err; 1363 } 1364 vlan->flags = flags; 1365 } 1366 if (set_mode) 1367 vlan->mode = mode; 1368 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1369 if (vlan->mode != MACVLAN_MODE_SOURCE) 1370 return -EINVAL; 1371 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1372 ret = macvlan_changelink_sources(vlan, macmode, data); 1373 if (ret) 1374 return ret; 1375 } 1376 return 0; 1377 } 1378 1379 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1380 { 1381 if (vlan->macaddr_count == 0) 1382 return 0; 1383 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1384 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1385 } 1386 1387 static size_t macvlan_get_size(const struct net_device *dev) 1388 { 1389 struct macvlan_dev *vlan = netdev_priv(dev); 1390 1391 return (0 1392 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1393 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1394 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1395 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1396 ); 1397 } 1398 1399 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1400 const struct macvlan_dev *vlan, 1401 const int i) 1402 { 1403 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1404 struct macvlan_source_entry *entry; 1405 1406 hlist_for_each_entry_rcu(entry, h, hlist) { 1407 if (entry->vlan != vlan) 1408 continue; 1409 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1410 return 1; 1411 } 1412 return 0; 1413 } 1414 1415 static int macvlan_fill_info(struct sk_buff *skb, 1416 const struct net_device *dev) 1417 { 1418 struct macvlan_dev *vlan = netdev_priv(dev); 1419 int i; 1420 struct nlattr *nest; 1421 1422 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1423 goto nla_put_failure; 1424 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1425 goto nla_put_failure; 1426 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1427 goto nla_put_failure; 1428 if (vlan->macaddr_count > 0) { 1429 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1430 if (nest == NULL) 1431 goto nla_put_failure; 1432 1433 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1434 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1435 goto nla_put_failure; 1436 } 1437 nla_nest_end(skb, nest); 1438 } 1439 return 0; 1440 1441 nla_put_failure: 1442 return -EMSGSIZE; 1443 } 1444 1445 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1446 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1447 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1448 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1449 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1450 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1451 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1452 }; 1453 1454 int macvlan_link_register(struct rtnl_link_ops *ops) 1455 { 1456 /* common fields */ 1457 ops->priv_size = sizeof(struct macvlan_dev); 1458 ops->validate = macvlan_validate; 1459 ops->maxtype = IFLA_MACVLAN_MAX; 1460 ops->policy = macvlan_policy; 1461 ops->changelink = macvlan_changelink; 1462 ops->get_size = macvlan_get_size; 1463 ops->fill_info = macvlan_fill_info; 1464 1465 return rtnl_link_register(ops); 1466 }; 1467 EXPORT_SYMBOL_GPL(macvlan_link_register); 1468 1469 static struct rtnl_link_ops macvlan_link_ops = { 1470 .kind = "macvlan", 1471 .setup = macvlan_setup, 1472 .newlink = macvlan_newlink, 1473 .dellink = macvlan_dellink, 1474 }; 1475 1476 static int macvlan_device_event(struct notifier_block *unused, 1477 unsigned long event, void *ptr) 1478 { 1479 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1480 struct macvlan_dev *vlan, *next; 1481 struct macvlan_port *port; 1482 LIST_HEAD(list_kill); 1483 1484 if (!macvlan_port_exists(dev)) 1485 return NOTIFY_DONE; 1486 1487 port = macvlan_port_get_rtnl(dev); 1488 1489 switch (event) { 1490 case NETDEV_CHANGE: 1491 list_for_each_entry(vlan, &port->vlans, list) 1492 netif_stacked_transfer_operstate(vlan->lowerdev, 1493 vlan->dev); 1494 break; 1495 case NETDEV_FEAT_CHANGE: 1496 list_for_each_entry(vlan, &port->vlans, list) { 1497 vlan->dev->gso_max_size = dev->gso_max_size; 1498 netdev_update_features(vlan->dev); 1499 } 1500 break; 1501 case NETDEV_CHANGEMTU: 1502 list_for_each_entry(vlan, &port->vlans, list) { 1503 if (vlan->dev->mtu <= dev->mtu) 1504 continue; 1505 dev_set_mtu(vlan->dev, dev->mtu); 1506 } 1507 break; 1508 case NETDEV_CHANGEADDR: 1509 if (!port->passthru) 1510 return NOTIFY_DONE; 1511 1512 vlan = list_first_entry_or_null(&port->vlans, 1513 struct macvlan_dev, 1514 list); 1515 1516 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1517 return NOTIFY_BAD; 1518 1519 break; 1520 case NETDEV_UNREGISTER: 1521 /* twiddle thumbs on netns device moves */ 1522 if (dev->reg_state != NETREG_UNREGISTERING) 1523 break; 1524 1525 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1526 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1527 unregister_netdevice_many(&list_kill); 1528 break; 1529 case NETDEV_PRE_TYPE_CHANGE: 1530 /* Forbid underlaying device to change its type. */ 1531 return NOTIFY_BAD; 1532 1533 case NETDEV_NOTIFY_PEERS: 1534 case NETDEV_BONDING_FAILOVER: 1535 case NETDEV_RESEND_IGMP: 1536 /* Propagate to all vlans */ 1537 list_for_each_entry(vlan, &port->vlans, list) 1538 call_netdevice_notifiers(event, vlan->dev); 1539 } 1540 return NOTIFY_DONE; 1541 } 1542 1543 static struct notifier_block macvlan_notifier_block __read_mostly = { 1544 .notifier_call = macvlan_device_event, 1545 }; 1546 1547 static int __init macvlan_init_module(void) 1548 { 1549 int err; 1550 1551 register_netdevice_notifier(&macvlan_notifier_block); 1552 1553 err = macvlan_link_register(&macvlan_link_ops); 1554 if (err < 0) 1555 goto err1; 1556 return 0; 1557 err1: 1558 unregister_netdevice_notifier(&macvlan_notifier_block); 1559 return err; 1560 } 1561 1562 static void __exit macvlan_cleanup_module(void) 1563 { 1564 rtnl_link_unregister(&macvlan_link_ops); 1565 unregister_netdevice_notifier(&macvlan_notifier_block); 1566 } 1567 1568 module_init(macvlan_init_module); 1569 module_exit(macvlan_cleanup_module); 1570 1571 MODULE_LICENSE("GPL"); 1572 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1573 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1574 MODULE_ALIAS_RTNL_LINK("macvlan"); 1575