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