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 #define MACVLAN_F_PASSTHRU 1 43 #define MACVLAN_F_ADDRCHANGE 2 44 45 struct macvlan_port { 46 struct net_device *dev; 47 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 48 struct list_head vlans; 49 struct sk_buff_head bc_queue; 50 struct work_struct bc_work; 51 u32 flags; 52 int count; 53 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE]; 54 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ); 55 unsigned char perm_addr[ETH_ALEN]; 56 }; 57 58 struct macvlan_source_entry { 59 struct hlist_node hlist; 60 struct macvlan_dev *vlan; 61 unsigned char addr[6+2] __aligned(sizeof(u16)); 62 struct rcu_head rcu; 63 }; 64 65 struct macvlan_skb_cb { 66 const struct macvlan_dev *src; 67 }; 68 69 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 70 71 static void macvlan_port_destroy(struct net_device *dev); 72 73 static inline bool macvlan_passthru(const struct macvlan_port *port) 74 { 75 return port->flags & MACVLAN_F_PASSTHRU; 76 } 77 78 static inline void macvlan_set_passthru(struct macvlan_port *port) 79 { 80 port->flags |= MACVLAN_F_PASSTHRU; 81 } 82 83 static inline bool macvlan_addr_change(const struct macvlan_port *port) 84 { 85 return port->flags & MACVLAN_F_ADDRCHANGE; 86 } 87 88 static inline void macvlan_set_addr_change(struct macvlan_port *port) 89 { 90 port->flags |= MACVLAN_F_ADDRCHANGE; 91 } 92 93 static inline void macvlan_clear_addr_change(struct macvlan_port *port) 94 { 95 port->flags &= ~MACVLAN_F_ADDRCHANGE; 96 } 97 98 /* Hash Ethernet address */ 99 static u32 macvlan_eth_hash(const unsigned char *addr) 100 { 101 u64 value = get_unaligned((u64 *)addr); 102 103 /* only want 6 bytes */ 104 #ifdef __BIG_ENDIAN 105 value >>= 16; 106 #else 107 value <<= 16; 108 #endif 109 return hash_64(value, MACVLAN_HASH_BITS); 110 } 111 112 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 113 { 114 return rcu_dereference(dev->rx_handler_data); 115 } 116 117 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 118 { 119 return rtnl_dereference(dev->rx_handler_data); 120 } 121 122 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 123 124 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 125 const unsigned char *addr) 126 { 127 struct macvlan_dev *vlan; 128 u32 idx = macvlan_eth_hash(addr); 129 130 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) { 131 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 132 return vlan; 133 } 134 return NULL; 135 } 136 137 static struct macvlan_source_entry *macvlan_hash_lookup_source( 138 const struct macvlan_dev *vlan, 139 const unsigned char *addr) 140 { 141 struct macvlan_source_entry *entry; 142 u32 idx = macvlan_eth_hash(addr); 143 struct hlist_head *h = &vlan->port->vlan_source_hash[idx]; 144 145 hlist_for_each_entry_rcu(entry, h, hlist) { 146 if (ether_addr_equal_64bits(entry->addr, addr) && 147 entry->vlan == vlan) 148 return entry; 149 } 150 return NULL; 151 } 152 153 static int macvlan_hash_add_source(struct macvlan_dev *vlan, 154 const unsigned char *addr) 155 { 156 struct macvlan_port *port = vlan->port; 157 struct macvlan_source_entry *entry; 158 struct hlist_head *h; 159 160 entry = macvlan_hash_lookup_source(vlan, addr); 161 if (entry) 162 return 0; 163 164 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 165 if (!entry) 166 return -ENOMEM; 167 168 ether_addr_copy(entry->addr, addr); 169 entry->vlan = vlan; 170 h = &port->vlan_source_hash[macvlan_eth_hash(addr)]; 171 hlist_add_head_rcu(&entry->hlist, h); 172 vlan->macaddr_count++; 173 174 return 0; 175 } 176 177 static void macvlan_hash_add(struct macvlan_dev *vlan) 178 { 179 struct macvlan_port *port = vlan->port; 180 const unsigned char *addr = vlan->dev->dev_addr; 181 u32 idx = macvlan_eth_hash(addr); 182 183 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]); 184 } 185 186 static void macvlan_hash_del_source(struct macvlan_source_entry *entry) 187 { 188 hlist_del_rcu(&entry->hlist); 189 kfree_rcu(entry, rcu); 190 } 191 192 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 193 { 194 hlist_del_rcu(&vlan->hlist); 195 if (sync) 196 synchronize_rcu(); 197 } 198 199 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 200 const unsigned char *addr) 201 { 202 macvlan_hash_del(vlan, true); 203 /* Now that we are unhashed it is safe to change the device 204 * address without confusing packet delivery. 205 */ 206 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 207 macvlan_hash_add(vlan); 208 } 209 210 static bool macvlan_addr_busy(const struct macvlan_port *port, 211 const unsigned char *addr) 212 { 213 /* Test to see if the specified address is 214 * currently in use by the underlying device or 215 * another macvlan. 216 */ 217 if (!macvlan_passthru(port) && !macvlan_addr_change(port) && 218 ether_addr_equal_64bits(port->dev->dev_addr, addr)) 219 return true; 220 221 if (macvlan_hash_lookup(port, addr)) 222 return true; 223 224 return false; 225 } 226 227 228 static int macvlan_broadcast_one(struct sk_buff *skb, 229 const struct macvlan_dev *vlan, 230 const struct ethhdr *eth, bool local) 231 { 232 struct net_device *dev = vlan->dev; 233 234 if (local) 235 return __dev_forward_skb(dev, skb); 236 237 skb->dev = dev; 238 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 239 skb->pkt_type = PACKET_BROADCAST; 240 else 241 skb->pkt_type = PACKET_MULTICAST; 242 243 return 0; 244 } 245 246 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 247 { 248 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 249 } 250 251 252 static unsigned int mc_hash(const struct macvlan_dev *vlan, 253 const unsigned char *addr) 254 { 255 u32 val = __get_unaligned_cpu32(addr + 2); 256 257 val ^= macvlan_hash_mix(vlan); 258 return hash_32(val, MACVLAN_MC_FILTER_BITS); 259 } 260 261 static void macvlan_broadcast(struct sk_buff *skb, 262 const struct macvlan_port *port, 263 struct net_device *src, 264 enum macvlan_mode mode) 265 { 266 const struct ethhdr *eth = eth_hdr(skb); 267 const struct macvlan_dev *vlan; 268 struct sk_buff *nskb; 269 unsigned int i; 270 int err; 271 unsigned int hash; 272 273 if (skb->protocol == htons(ETH_P_PAUSE)) 274 return; 275 276 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 277 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 278 if (vlan->dev == src || !(vlan->mode & mode)) 279 continue; 280 281 hash = mc_hash(vlan, eth->h_dest); 282 if (!test_bit(hash, vlan->mc_filter)) 283 continue; 284 285 err = NET_RX_DROP; 286 nskb = skb_clone(skb, GFP_ATOMIC); 287 if (likely(nskb)) 288 err = macvlan_broadcast_one( 289 nskb, vlan, eth, 290 mode == MACVLAN_MODE_BRIDGE) ?: 291 netif_rx_ni(nskb); 292 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 293 err == NET_RX_SUCCESS, true); 294 } 295 } 296 } 297 298 static void macvlan_process_broadcast(struct work_struct *w) 299 { 300 struct macvlan_port *port = container_of(w, struct macvlan_port, 301 bc_work); 302 struct sk_buff *skb; 303 struct sk_buff_head list; 304 305 __skb_queue_head_init(&list); 306 307 spin_lock_bh(&port->bc_queue.lock); 308 skb_queue_splice_tail_init(&port->bc_queue, &list); 309 spin_unlock_bh(&port->bc_queue.lock); 310 311 while ((skb = __skb_dequeue(&list))) { 312 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 313 314 rcu_read_lock(); 315 316 if (!src) 317 /* frame comes from an external address */ 318 macvlan_broadcast(skb, port, NULL, 319 MACVLAN_MODE_PRIVATE | 320 MACVLAN_MODE_VEPA | 321 MACVLAN_MODE_PASSTHRU| 322 MACVLAN_MODE_BRIDGE); 323 else if (src->mode == MACVLAN_MODE_VEPA) 324 /* flood to everyone except source */ 325 macvlan_broadcast(skb, port, src->dev, 326 MACVLAN_MODE_VEPA | 327 MACVLAN_MODE_BRIDGE); 328 else 329 /* 330 * flood only to VEPA ports, bridge ports 331 * already saw the frame on the way out. 332 */ 333 macvlan_broadcast(skb, port, src->dev, 334 MACVLAN_MODE_VEPA); 335 336 rcu_read_unlock(); 337 338 if (src) 339 dev_put(src->dev); 340 kfree_skb(skb); 341 } 342 } 343 344 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 345 const struct macvlan_dev *src, 346 struct sk_buff *skb) 347 { 348 struct sk_buff *nskb; 349 int err = -ENOMEM; 350 351 nskb = skb_clone(skb, GFP_ATOMIC); 352 if (!nskb) 353 goto err; 354 355 MACVLAN_SKB_CB(nskb)->src = src; 356 357 spin_lock(&port->bc_queue.lock); 358 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) { 359 if (src) 360 dev_hold(src->dev); 361 __skb_queue_tail(&port->bc_queue, nskb); 362 err = 0; 363 } 364 spin_unlock(&port->bc_queue.lock); 365 366 if (err) 367 goto free_nskb; 368 369 schedule_work(&port->bc_work); 370 return; 371 372 free_nskb: 373 kfree_skb(nskb); 374 err: 375 atomic_long_inc(&skb->dev->rx_dropped); 376 } 377 378 static void macvlan_flush_sources(struct macvlan_port *port, 379 struct macvlan_dev *vlan) 380 { 381 int i; 382 383 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 384 struct hlist_node *h, *n; 385 386 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) { 387 struct macvlan_source_entry *entry; 388 389 entry = hlist_entry(h, struct macvlan_source_entry, 390 hlist); 391 if (entry->vlan == vlan) 392 macvlan_hash_del_source(entry); 393 } 394 } 395 vlan->macaddr_count = 0; 396 } 397 398 static void macvlan_forward_source_one(struct sk_buff *skb, 399 struct macvlan_dev *vlan) 400 { 401 struct sk_buff *nskb; 402 struct net_device *dev; 403 int len; 404 int ret; 405 406 dev = vlan->dev; 407 if (unlikely(!(dev->flags & IFF_UP))) 408 return; 409 410 nskb = skb_clone(skb, GFP_ATOMIC); 411 if (!nskb) 412 return; 413 414 len = nskb->len + ETH_HLEN; 415 nskb->dev = dev; 416 nskb->pkt_type = PACKET_HOST; 417 418 ret = netif_rx(nskb); 419 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 420 } 421 422 static void macvlan_forward_source(struct sk_buff *skb, 423 struct macvlan_port *port, 424 const unsigned char *addr) 425 { 426 struct macvlan_source_entry *entry; 427 u32 idx = macvlan_eth_hash(addr); 428 struct hlist_head *h = &port->vlan_source_hash[idx]; 429 430 hlist_for_each_entry_rcu(entry, h, hlist) { 431 if (ether_addr_equal_64bits(entry->addr, addr)) 432 macvlan_forward_source_one(skb, entry->vlan); 433 } 434 } 435 436 /* called under rcu_read_lock() from netif_receive_skb */ 437 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 438 { 439 struct macvlan_port *port; 440 struct sk_buff *skb = *pskb; 441 const struct ethhdr *eth = eth_hdr(skb); 442 const struct macvlan_dev *vlan; 443 const struct macvlan_dev *src; 444 struct net_device *dev; 445 unsigned int len = 0; 446 int ret; 447 rx_handler_result_t handle_res; 448 449 port = macvlan_port_get_rcu(skb->dev); 450 if (is_multicast_ether_addr(eth->h_dest)) { 451 unsigned int hash; 452 453 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); 454 if (!skb) 455 return RX_HANDLER_CONSUMED; 456 *pskb = skb; 457 eth = eth_hdr(skb); 458 macvlan_forward_source(skb, port, eth->h_source); 459 src = macvlan_hash_lookup(port, eth->h_source); 460 if (src && src->mode != MACVLAN_MODE_VEPA && 461 src->mode != MACVLAN_MODE_BRIDGE) { 462 /* forward to original port. */ 463 vlan = src; 464 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 465 netif_rx(skb); 466 handle_res = RX_HANDLER_CONSUMED; 467 goto out; 468 } 469 470 hash = mc_hash(NULL, eth->h_dest); 471 if (test_bit(hash, port->mc_filter)) 472 macvlan_broadcast_enqueue(port, src, skb); 473 474 return RX_HANDLER_PASS; 475 } 476 477 macvlan_forward_source(skb, port, eth->h_source); 478 if (macvlan_passthru(port)) 479 vlan = list_first_or_null_rcu(&port->vlans, 480 struct macvlan_dev, list); 481 else 482 vlan = macvlan_hash_lookup(port, eth->h_dest); 483 if (vlan == NULL) 484 return RX_HANDLER_PASS; 485 486 dev = vlan->dev; 487 if (unlikely(!(dev->flags & IFF_UP))) { 488 kfree_skb(skb); 489 return RX_HANDLER_CONSUMED; 490 } 491 len = skb->len + ETH_HLEN; 492 skb = skb_share_check(skb, GFP_ATOMIC); 493 if (!skb) { 494 ret = NET_RX_DROP; 495 handle_res = RX_HANDLER_CONSUMED; 496 goto out; 497 } 498 499 *pskb = skb; 500 skb->dev = dev; 501 skb->pkt_type = PACKET_HOST; 502 503 ret = NET_RX_SUCCESS; 504 handle_res = RX_HANDLER_ANOTHER; 505 out: 506 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 507 return handle_res; 508 } 509 510 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 511 { 512 const struct macvlan_dev *vlan = netdev_priv(dev); 513 const struct macvlan_port *port = vlan->port; 514 const struct macvlan_dev *dest; 515 516 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 517 const struct ethhdr *eth = (void *)skb->data; 518 519 /* send to other bridge ports directly */ 520 if (is_multicast_ether_addr(eth->h_dest)) { 521 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 522 goto xmit_world; 523 } 524 525 dest = macvlan_hash_lookup(port, eth->h_dest); 526 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 527 /* send to lowerdev first for its network taps */ 528 dev_forward_skb(vlan->lowerdev, skb); 529 530 return NET_XMIT_SUCCESS; 531 } 532 } 533 534 xmit_world: 535 skb->dev = vlan->lowerdev; 536 return dev_queue_xmit(skb); 537 } 538 539 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 540 { 541 #ifdef CONFIG_NET_POLL_CONTROLLER 542 if (vlan->netpoll) 543 netpoll_send_skb(vlan->netpoll, skb); 544 #else 545 BUG(); 546 #endif 547 return NETDEV_TX_OK; 548 } 549 550 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 551 struct net_device *dev) 552 { 553 unsigned int len = skb->len; 554 int ret; 555 struct macvlan_dev *vlan = netdev_priv(dev); 556 557 if (unlikely(netpoll_tx_running(dev))) 558 return macvlan_netpoll_send_skb(vlan, skb); 559 560 if (vlan->fwd_priv) { 561 skb->dev = vlan->lowerdev; 562 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); 563 } else { 564 ret = macvlan_queue_xmit(skb, dev); 565 } 566 567 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 568 struct vlan_pcpu_stats *pcpu_stats; 569 570 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 571 u64_stats_update_begin(&pcpu_stats->syncp); 572 pcpu_stats->tx_packets++; 573 pcpu_stats->tx_bytes += len; 574 u64_stats_update_end(&pcpu_stats->syncp); 575 } else { 576 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 577 } 578 return ret; 579 } 580 581 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 582 unsigned short type, const void *daddr, 583 const void *saddr, unsigned len) 584 { 585 const struct macvlan_dev *vlan = netdev_priv(dev); 586 struct net_device *lowerdev = vlan->lowerdev; 587 588 return dev_hard_header(skb, lowerdev, type, daddr, 589 saddr ? : dev->dev_addr, len); 590 } 591 592 static const struct header_ops macvlan_hard_header_ops = { 593 .create = macvlan_hard_header, 594 .parse = eth_header_parse, 595 .cache = eth_header_cache, 596 .cache_update = eth_header_cache_update, 597 }; 598 599 static struct rtnl_link_ops macvlan_link_ops; 600 601 static int macvlan_open(struct net_device *dev) 602 { 603 struct macvlan_dev *vlan = netdev_priv(dev); 604 struct net_device *lowerdev = vlan->lowerdev; 605 int err; 606 607 if (macvlan_passthru(vlan->port)) { 608 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 609 err = dev_set_promiscuity(lowerdev, 1); 610 if (err < 0) 611 goto out; 612 } 613 goto hash_add; 614 } 615 616 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && 617 dev->rtnl_link_ops == &macvlan_link_ops) { 618 vlan->fwd_priv = 619 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 620 621 /* If we get a NULL pointer back, or if we get an error 622 * then we should just fall through to the non accelerated path 623 */ 624 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 625 vlan->fwd_priv = NULL; 626 } else 627 return 0; 628 } 629 630 err = -EBUSY; 631 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 632 goto out; 633 634 err = dev_uc_add(lowerdev, dev->dev_addr); 635 if (err < 0) 636 goto out; 637 if (dev->flags & IFF_ALLMULTI) { 638 err = dev_set_allmulti(lowerdev, 1); 639 if (err < 0) 640 goto del_unicast; 641 } 642 643 if (dev->flags & IFF_PROMISC) { 644 err = dev_set_promiscuity(lowerdev, 1); 645 if (err < 0) 646 goto clear_multi; 647 } 648 649 hash_add: 650 macvlan_hash_add(vlan); 651 return 0; 652 653 clear_multi: 654 if (dev->flags & IFF_ALLMULTI) 655 dev_set_allmulti(lowerdev, -1); 656 del_unicast: 657 dev_uc_del(lowerdev, dev->dev_addr); 658 out: 659 if (vlan->fwd_priv) { 660 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 661 vlan->fwd_priv); 662 vlan->fwd_priv = NULL; 663 } 664 return err; 665 } 666 667 static int macvlan_stop(struct net_device *dev) 668 { 669 struct macvlan_dev *vlan = netdev_priv(dev); 670 struct net_device *lowerdev = vlan->lowerdev; 671 672 if (vlan->fwd_priv) { 673 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 674 vlan->fwd_priv); 675 vlan->fwd_priv = NULL; 676 return 0; 677 } 678 679 dev_uc_unsync(lowerdev, dev); 680 dev_mc_unsync(lowerdev, dev); 681 682 if (macvlan_passthru(vlan->port)) { 683 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 684 dev_set_promiscuity(lowerdev, -1); 685 goto hash_del; 686 } 687 688 if (dev->flags & IFF_ALLMULTI) 689 dev_set_allmulti(lowerdev, -1); 690 691 if (dev->flags & IFF_PROMISC) 692 dev_set_promiscuity(lowerdev, -1); 693 694 dev_uc_del(lowerdev, dev->dev_addr); 695 696 hash_del: 697 macvlan_hash_del(vlan, !dev->dismantle); 698 return 0; 699 } 700 701 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 702 { 703 struct macvlan_dev *vlan = netdev_priv(dev); 704 struct net_device *lowerdev = vlan->lowerdev; 705 struct macvlan_port *port = vlan->port; 706 int err; 707 708 if (!(dev->flags & IFF_UP)) { 709 /* Just copy in the new address */ 710 ether_addr_copy(dev->dev_addr, addr); 711 } else { 712 /* Rehash and update the device filters */ 713 if (macvlan_addr_busy(vlan->port, addr)) 714 return -EBUSY; 715 716 if (!macvlan_passthru(port)) { 717 err = dev_uc_add(lowerdev, addr); 718 if (err) 719 return err; 720 721 dev_uc_del(lowerdev, dev->dev_addr); 722 } 723 724 macvlan_hash_change_addr(vlan, addr); 725 } 726 if (macvlan_passthru(port) && !macvlan_addr_change(port)) { 727 /* Since addr_change isn't set, we are here due to lower 728 * device change. Save the lower-dev address so we can 729 * restore it later. 730 */ 731 ether_addr_copy(vlan->port->perm_addr, 732 lowerdev->dev_addr); 733 } 734 macvlan_clear_addr_change(port); 735 return 0; 736 } 737 738 static int macvlan_set_mac_address(struct net_device *dev, void *p) 739 { 740 struct macvlan_dev *vlan = netdev_priv(dev); 741 struct sockaddr *addr = p; 742 743 if (!is_valid_ether_addr(addr->sa_data)) 744 return -EADDRNOTAVAIL; 745 746 /* If the addresses are the same, this is a no-op */ 747 if (ether_addr_equal(dev->dev_addr, addr->sa_data)) 748 return 0; 749 750 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 751 macvlan_set_addr_change(vlan->port); 752 dev_set_mac_address(vlan->lowerdev, addr); 753 return 0; 754 } 755 756 return macvlan_sync_address(dev, addr->sa_data); 757 } 758 759 static void macvlan_change_rx_flags(struct net_device *dev, int change) 760 { 761 struct macvlan_dev *vlan = netdev_priv(dev); 762 struct net_device *lowerdev = vlan->lowerdev; 763 764 if (dev->flags & IFF_UP) { 765 if (change & IFF_ALLMULTI) 766 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 767 if (change & IFF_PROMISC) 768 dev_set_promiscuity(lowerdev, 769 dev->flags & IFF_PROMISC ? 1 : -1); 770 771 } 772 } 773 774 static void macvlan_compute_filter(unsigned long *mc_filter, 775 struct net_device *dev, 776 struct macvlan_dev *vlan) 777 { 778 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 779 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 780 } else { 781 struct netdev_hw_addr *ha; 782 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 783 784 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 785 netdev_for_each_mc_addr(ha, dev) { 786 __set_bit(mc_hash(vlan, ha->addr), filter); 787 } 788 789 __set_bit(mc_hash(vlan, dev->broadcast), filter); 790 791 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 792 } 793 } 794 795 static void macvlan_set_mac_lists(struct net_device *dev) 796 { 797 struct macvlan_dev *vlan = netdev_priv(dev); 798 799 macvlan_compute_filter(vlan->mc_filter, dev, vlan); 800 801 dev_uc_sync(vlan->lowerdev, dev); 802 dev_mc_sync(vlan->lowerdev, dev); 803 804 /* This is slightly inaccurate as we're including the subscription 805 * list of vlan->lowerdev too. 806 * 807 * Bug alert: This only works if everyone has the same broadcast 808 * address as lowerdev. As soon as someone changes theirs this 809 * will break. 810 * 811 * However, this is already broken as when you change your broadcast 812 * address we don't get called. 813 * 814 * The solution is to maintain a list of broadcast addresses like 815 * we do for uc/mc, if you care. 816 */ 817 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); 818 } 819 820 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 821 { 822 struct macvlan_dev *vlan = netdev_priv(dev); 823 824 if (vlan->lowerdev->mtu < new_mtu) 825 return -EINVAL; 826 dev->mtu = new_mtu; 827 return 0; 828 } 829 830 /* 831 * macvlan network devices have devices nesting below it and are a special 832 * "super class" of normal network devices; split their locks off into a 833 * separate class since they always nest. 834 */ 835 static struct lock_class_key macvlan_netdev_addr_lock_key; 836 837 #define ALWAYS_ON_OFFLOADS \ 838 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ 839 NETIF_F_GSO_ROBUST) 840 841 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX) 842 843 #define MACVLAN_FEATURES \ 844 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 845 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \ 846 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 847 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 848 849 #define MACVLAN_STATE_MASK \ 850 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 851 852 static int macvlan_get_nest_level(struct net_device *dev) 853 { 854 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 855 } 856 857 static void macvlan_set_lockdep_class(struct net_device *dev) 858 { 859 netdev_lockdep_set_classes(dev); 860 lockdep_set_class_and_subclass(&dev->addr_list_lock, 861 &macvlan_netdev_addr_lock_key, 862 macvlan_get_nest_level(dev)); 863 } 864 865 static int macvlan_init(struct net_device *dev) 866 { 867 struct macvlan_dev *vlan = netdev_priv(dev); 868 const struct net_device *lowerdev = vlan->lowerdev; 869 struct macvlan_port *port = vlan->port; 870 871 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 872 (lowerdev->state & MACVLAN_STATE_MASK); 873 dev->features = lowerdev->features & MACVLAN_FEATURES; 874 dev->features |= ALWAYS_ON_FEATURES; 875 dev->hw_features |= NETIF_F_LRO; 876 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 877 dev->vlan_features |= ALWAYS_ON_OFFLOADS; 878 dev->gso_max_size = lowerdev->gso_max_size; 879 dev->gso_max_segs = lowerdev->gso_max_segs; 880 dev->hard_header_len = lowerdev->hard_header_len; 881 882 macvlan_set_lockdep_class(dev); 883 884 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 885 if (!vlan->pcpu_stats) 886 return -ENOMEM; 887 888 port->count += 1; 889 890 return 0; 891 } 892 893 static void macvlan_uninit(struct net_device *dev) 894 { 895 struct macvlan_dev *vlan = netdev_priv(dev); 896 struct macvlan_port *port = vlan->port; 897 898 free_percpu(vlan->pcpu_stats); 899 900 macvlan_flush_sources(port, vlan); 901 port->count -= 1; 902 if (!port->count) 903 macvlan_port_destroy(port->dev); 904 } 905 906 static void macvlan_dev_get_stats64(struct net_device *dev, 907 struct rtnl_link_stats64 *stats) 908 { 909 struct macvlan_dev *vlan = netdev_priv(dev); 910 911 if (vlan->pcpu_stats) { 912 struct vlan_pcpu_stats *p; 913 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 914 u32 rx_errors = 0, tx_dropped = 0; 915 unsigned int start; 916 int i; 917 918 for_each_possible_cpu(i) { 919 p = per_cpu_ptr(vlan->pcpu_stats, i); 920 do { 921 start = u64_stats_fetch_begin_irq(&p->syncp); 922 rx_packets = p->rx_packets; 923 rx_bytes = p->rx_bytes; 924 rx_multicast = p->rx_multicast; 925 tx_packets = p->tx_packets; 926 tx_bytes = p->tx_bytes; 927 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 928 929 stats->rx_packets += rx_packets; 930 stats->rx_bytes += rx_bytes; 931 stats->multicast += rx_multicast; 932 stats->tx_packets += tx_packets; 933 stats->tx_bytes += tx_bytes; 934 /* rx_errors & tx_dropped are u32, updated 935 * without syncp protection. 936 */ 937 rx_errors += p->rx_errors; 938 tx_dropped += p->tx_dropped; 939 } 940 stats->rx_errors = rx_errors; 941 stats->rx_dropped = rx_errors; 942 stats->tx_dropped = tx_dropped; 943 } 944 } 945 946 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 947 __be16 proto, u16 vid) 948 { 949 struct macvlan_dev *vlan = netdev_priv(dev); 950 struct net_device *lowerdev = vlan->lowerdev; 951 952 return vlan_vid_add(lowerdev, proto, vid); 953 } 954 955 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 956 __be16 proto, u16 vid) 957 { 958 struct macvlan_dev *vlan = netdev_priv(dev); 959 struct net_device *lowerdev = vlan->lowerdev; 960 961 vlan_vid_del(lowerdev, proto, vid); 962 return 0; 963 } 964 965 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 966 struct net_device *dev, 967 const unsigned char *addr, u16 vid, 968 u16 flags) 969 { 970 struct macvlan_dev *vlan = netdev_priv(dev); 971 int err = -EINVAL; 972 973 /* Support unicast filter only on passthru devices. 974 * Multicast filter should be allowed on all devices. 975 */ 976 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 977 return -EOPNOTSUPP; 978 979 if (flags & NLM_F_REPLACE) 980 return -EOPNOTSUPP; 981 982 if (is_unicast_ether_addr(addr)) 983 err = dev_uc_add_excl(dev, addr); 984 else if (is_multicast_ether_addr(addr)) 985 err = dev_mc_add_excl(dev, addr); 986 987 return err; 988 } 989 990 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 991 struct net_device *dev, 992 const unsigned char *addr, u16 vid) 993 { 994 struct macvlan_dev *vlan = netdev_priv(dev); 995 int err = -EINVAL; 996 997 /* Support unicast filter only on passthru devices. 998 * Multicast filter should be allowed on all devices. 999 */ 1000 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1001 return -EOPNOTSUPP; 1002 1003 if (is_unicast_ether_addr(addr)) 1004 err = dev_uc_del(dev, addr); 1005 else if (is_multicast_ether_addr(addr)) 1006 err = dev_mc_del(dev, addr); 1007 1008 return err; 1009 } 1010 1011 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 1012 struct ethtool_drvinfo *drvinfo) 1013 { 1014 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 1015 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 1016 } 1017 1018 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 1019 struct ethtool_link_ksettings *cmd) 1020 { 1021 const struct macvlan_dev *vlan = netdev_priv(dev); 1022 1023 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 1024 } 1025 1026 static netdev_features_t macvlan_fix_features(struct net_device *dev, 1027 netdev_features_t features) 1028 { 1029 struct macvlan_dev *vlan = netdev_priv(dev); 1030 netdev_features_t lowerdev_features = vlan->lowerdev->features; 1031 netdev_features_t mask; 1032 1033 features |= NETIF_F_ALL_FOR_ALL; 1034 features &= (vlan->set_features | ~MACVLAN_FEATURES); 1035 mask = features; 1036 1037 lowerdev_features &= (features | ~NETIF_F_LRO); 1038 features = netdev_increment_features(lowerdev_features, features, mask); 1039 features |= ALWAYS_ON_FEATURES; 1040 features &= ~NETIF_F_NETNS_LOCAL; 1041 1042 return features; 1043 } 1044 1045 #ifdef CONFIG_NET_POLL_CONTROLLER 1046 static void macvlan_dev_poll_controller(struct net_device *dev) 1047 { 1048 return; 1049 } 1050 1051 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 1052 { 1053 struct macvlan_dev *vlan = netdev_priv(dev); 1054 struct net_device *real_dev = vlan->lowerdev; 1055 struct netpoll *netpoll; 1056 int err = 0; 1057 1058 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 1059 err = -ENOMEM; 1060 if (!netpoll) 1061 goto out; 1062 1063 err = __netpoll_setup(netpoll, real_dev); 1064 if (err) { 1065 kfree(netpoll); 1066 goto out; 1067 } 1068 1069 vlan->netpoll = netpoll; 1070 1071 out: 1072 return err; 1073 } 1074 1075 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1076 { 1077 struct macvlan_dev *vlan = netdev_priv(dev); 1078 struct netpoll *netpoll = vlan->netpoll; 1079 1080 if (!netpoll) 1081 return; 1082 1083 vlan->netpoll = NULL; 1084 1085 __netpoll_free_async(netpoll); 1086 } 1087 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1088 1089 static int macvlan_dev_get_iflink(const struct net_device *dev) 1090 { 1091 struct macvlan_dev *vlan = netdev_priv(dev); 1092 1093 return vlan->lowerdev->ifindex; 1094 } 1095 1096 static const struct ethtool_ops macvlan_ethtool_ops = { 1097 .get_link = ethtool_op_get_link, 1098 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1099 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1100 }; 1101 1102 static const struct net_device_ops macvlan_netdev_ops = { 1103 .ndo_init = macvlan_init, 1104 .ndo_uninit = macvlan_uninit, 1105 .ndo_open = macvlan_open, 1106 .ndo_stop = macvlan_stop, 1107 .ndo_start_xmit = macvlan_start_xmit, 1108 .ndo_change_mtu = macvlan_change_mtu, 1109 .ndo_fix_features = macvlan_fix_features, 1110 .ndo_change_rx_flags = macvlan_change_rx_flags, 1111 .ndo_set_mac_address = macvlan_set_mac_address, 1112 .ndo_set_rx_mode = macvlan_set_mac_lists, 1113 .ndo_get_stats64 = macvlan_dev_get_stats64, 1114 .ndo_validate_addr = eth_validate_addr, 1115 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1116 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1117 .ndo_fdb_add = macvlan_fdb_add, 1118 .ndo_fdb_del = macvlan_fdb_del, 1119 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1120 .ndo_get_lock_subclass = macvlan_get_nest_level, 1121 #ifdef CONFIG_NET_POLL_CONTROLLER 1122 .ndo_poll_controller = macvlan_dev_poll_controller, 1123 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1124 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1125 #endif 1126 .ndo_get_iflink = macvlan_dev_get_iflink, 1127 .ndo_features_check = passthru_features_check, 1128 }; 1129 1130 void macvlan_common_setup(struct net_device *dev) 1131 { 1132 ether_setup(dev); 1133 1134 dev->min_mtu = 0; 1135 dev->max_mtu = ETH_MAX_MTU; 1136 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1137 netif_keep_dst(dev); 1138 dev->priv_flags |= IFF_UNICAST_FLT; 1139 dev->netdev_ops = &macvlan_netdev_ops; 1140 dev->needs_free_netdev = true; 1141 dev->header_ops = &macvlan_hard_header_ops; 1142 dev->ethtool_ops = &macvlan_ethtool_ops; 1143 } 1144 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1145 1146 static void macvlan_setup(struct net_device *dev) 1147 { 1148 macvlan_common_setup(dev); 1149 dev->priv_flags |= IFF_NO_QUEUE; 1150 } 1151 1152 static int macvlan_port_create(struct net_device *dev) 1153 { 1154 struct macvlan_port *port; 1155 unsigned int i; 1156 int err; 1157 1158 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1159 return -EINVAL; 1160 1161 if (netdev_is_rx_handler_busy(dev)) 1162 return -EBUSY; 1163 1164 port = kzalloc(sizeof(*port), GFP_KERNEL); 1165 if (port == NULL) 1166 return -ENOMEM; 1167 1168 port->dev = dev; 1169 ether_addr_copy(port->perm_addr, dev->dev_addr); 1170 INIT_LIST_HEAD(&port->vlans); 1171 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1172 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1173 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1174 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1175 1176 skb_queue_head_init(&port->bc_queue); 1177 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1178 1179 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1180 if (err) 1181 kfree(port); 1182 else 1183 dev->priv_flags |= IFF_MACVLAN_PORT; 1184 return err; 1185 } 1186 1187 static void macvlan_port_destroy(struct net_device *dev) 1188 { 1189 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1190 struct sk_buff *skb; 1191 1192 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1193 netdev_rx_handler_unregister(dev); 1194 1195 /* After this point, no packet can schedule bc_work anymore, 1196 * but we need to cancel it and purge left skbs if any. 1197 */ 1198 cancel_work_sync(&port->bc_work); 1199 1200 while ((skb = __skb_dequeue(&port->bc_queue))) { 1201 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 1202 1203 if (src) 1204 dev_put(src->dev); 1205 1206 kfree_skb(skb); 1207 } 1208 1209 /* If the lower device address has been changed by passthru 1210 * macvlan, put it back. 1211 */ 1212 if (macvlan_passthru(port) && 1213 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { 1214 struct sockaddr sa; 1215 1216 sa.sa_family = port->dev->type; 1217 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len); 1218 dev_set_mac_address(port->dev, &sa); 1219 } 1220 1221 kfree(port); 1222 } 1223 1224 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 1225 { 1226 if (tb[IFLA_ADDRESS]) { 1227 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1228 return -EINVAL; 1229 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1230 return -EADDRNOTAVAIL; 1231 } 1232 1233 if (data && data[IFLA_MACVLAN_FLAGS] && 1234 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1235 return -EINVAL; 1236 1237 if (data && data[IFLA_MACVLAN_MODE]) { 1238 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1239 case MACVLAN_MODE_PRIVATE: 1240 case MACVLAN_MODE_VEPA: 1241 case MACVLAN_MODE_BRIDGE: 1242 case MACVLAN_MODE_PASSTHRU: 1243 case MACVLAN_MODE_SOURCE: 1244 break; 1245 default: 1246 return -EINVAL; 1247 } 1248 } 1249 1250 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1251 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1252 case MACVLAN_MACADDR_ADD: 1253 case MACVLAN_MACADDR_DEL: 1254 case MACVLAN_MACADDR_FLUSH: 1255 case MACVLAN_MACADDR_SET: 1256 break; 1257 default: 1258 return -EINVAL; 1259 } 1260 } 1261 1262 if (data && data[IFLA_MACVLAN_MACADDR]) { 1263 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1264 return -EINVAL; 1265 1266 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1267 return -EADDRNOTAVAIL; 1268 } 1269 1270 if (data && data[IFLA_MACVLAN_MACADDR_COUNT]) 1271 return -EINVAL; 1272 1273 return 0; 1274 } 1275 1276 /** 1277 * reconfigure list of remote source mac address 1278 * (only for macvlan devices in source mode) 1279 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1280 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1281 */ 1282 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1283 struct nlattr *data[]) 1284 { 1285 char *addr = NULL; 1286 int ret, rem, len; 1287 struct nlattr *nla, *head; 1288 struct macvlan_source_entry *entry; 1289 1290 if (data[IFLA_MACVLAN_MACADDR]) 1291 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1292 1293 if (mode == MACVLAN_MACADDR_ADD) { 1294 if (!addr) 1295 return -EINVAL; 1296 1297 return macvlan_hash_add_source(vlan, addr); 1298 1299 } else if (mode == MACVLAN_MACADDR_DEL) { 1300 if (!addr) 1301 return -EINVAL; 1302 1303 entry = macvlan_hash_lookup_source(vlan, addr); 1304 if (entry) { 1305 macvlan_hash_del_source(entry); 1306 vlan->macaddr_count--; 1307 } 1308 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1309 macvlan_flush_sources(vlan->port, vlan); 1310 } else if (mode == MACVLAN_MACADDR_SET) { 1311 macvlan_flush_sources(vlan->port, vlan); 1312 1313 if (addr) { 1314 ret = macvlan_hash_add_source(vlan, addr); 1315 if (ret) 1316 return ret; 1317 } 1318 1319 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1320 return 0; 1321 1322 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1323 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1324 1325 nla_for_each_attr(nla, head, len, rem) { 1326 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1327 nla_len(nla) != ETH_ALEN) 1328 continue; 1329 1330 addr = nla_data(nla); 1331 ret = macvlan_hash_add_source(vlan, addr); 1332 if (ret) 1333 return ret; 1334 } 1335 } else { 1336 return -EINVAL; 1337 } 1338 1339 return 0; 1340 } 1341 1342 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1343 struct nlattr *tb[], struct nlattr *data[]) 1344 { 1345 struct macvlan_dev *vlan = netdev_priv(dev); 1346 struct macvlan_port *port; 1347 struct net_device *lowerdev; 1348 int err; 1349 int macmode; 1350 bool create = false; 1351 1352 if (!tb[IFLA_LINK]) 1353 return -EINVAL; 1354 1355 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1356 if (lowerdev == NULL) 1357 return -ENODEV; 1358 1359 /* When creating macvlans or macvtaps on top of other macvlans - use 1360 * the real device as the lowerdev. 1361 */ 1362 if (netif_is_macvlan(lowerdev)) 1363 lowerdev = macvlan_dev_real_dev(lowerdev); 1364 1365 if (!tb[IFLA_MTU]) 1366 dev->mtu = lowerdev->mtu; 1367 else if (dev->mtu > lowerdev->mtu) 1368 return -EINVAL; 1369 1370 /* MTU range: 68 - lowerdev->max_mtu */ 1371 dev->min_mtu = ETH_MIN_MTU; 1372 dev->max_mtu = lowerdev->max_mtu; 1373 1374 if (!tb[IFLA_ADDRESS]) 1375 eth_hw_addr_random(dev); 1376 1377 if (!macvlan_port_exists(lowerdev)) { 1378 err = macvlan_port_create(lowerdev); 1379 if (err < 0) 1380 return err; 1381 create = true; 1382 } 1383 port = macvlan_port_get_rtnl(lowerdev); 1384 1385 /* Only 1 macvlan device can be created in passthru mode */ 1386 if (macvlan_passthru(port)) { 1387 /* The macvlan port must be not created this time, 1388 * still goto destroy_macvlan_port for readability. 1389 */ 1390 err = -EINVAL; 1391 goto destroy_macvlan_port; 1392 } 1393 1394 vlan->lowerdev = lowerdev; 1395 vlan->dev = dev; 1396 vlan->port = port; 1397 vlan->set_features = MACVLAN_FEATURES; 1398 vlan->nest_level = dev_get_nest_level(lowerdev) + 1; 1399 1400 vlan->mode = MACVLAN_MODE_VEPA; 1401 if (data && data[IFLA_MACVLAN_MODE]) 1402 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1403 1404 if (data && data[IFLA_MACVLAN_FLAGS]) 1405 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1406 1407 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1408 if (port->count) { 1409 err = -EINVAL; 1410 goto destroy_macvlan_port; 1411 } 1412 macvlan_set_passthru(port); 1413 eth_hw_addr_inherit(dev, lowerdev); 1414 } 1415 1416 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1417 if (vlan->mode != MACVLAN_MODE_SOURCE) { 1418 err = -EINVAL; 1419 goto destroy_macvlan_port; 1420 } 1421 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1422 err = macvlan_changelink_sources(vlan, macmode, data); 1423 if (err) 1424 goto destroy_macvlan_port; 1425 } 1426 1427 err = register_netdevice(dev); 1428 if (err < 0) 1429 goto destroy_macvlan_port; 1430 1431 dev->priv_flags |= IFF_MACVLAN; 1432 err = netdev_upper_dev_link(lowerdev, dev); 1433 if (err) 1434 goto unregister_netdev; 1435 1436 list_add_tail_rcu(&vlan->list, &port->vlans); 1437 netif_stacked_transfer_operstate(lowerdev, dev); 1438 linkwatch_fire_event(dev); 1439 1440 return 0; 1441 1442 unregister_netdev: 1443 unregister_netdevice(dev); 1444 destroy_macvlan_port: 1445 if (create) 1446 macvlan_port_destroy(port->dev); 1447 return err; 1448 } 1449 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1450 1451 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1452 struct nlattr *tb[], struct nlattr *data[]) 1453 { 1454 return macvlan_common_newlink(src_net, dev, tb, data); 1455 } 1456 1457 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1458 { 1459 struct macvlan_dev *vlan = netdev_priv(dev); 1460 1461 if (vlan->mode == MACVLAN_MODE_SOURCE) 1462 macvlan_flush_sources(vlan->port, vlan); 1463 list_del_rcu(&vlan->list); 1464 unregister_netdevice_queue(dev, head); 1465 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1466 } 1467 EXPORT_SYMBOL_GPL(macvlan_dellink); 1468 1469 static int macvlan_changelink(struct net_device *dev, 1470 struct nlattr *tb[], struct nlattr *data[]) 1471 { 1472 struct macvlan_dev *vlan = netdev_priv(dev); 1473 enum macvlan_mode mode; 1474 bool set_mode = false; 1475 enum macvlan_macaddr_mode macmode; 1476 int ret; 1477 1478 /* Validate mode, but don't set yet: setting flags may fail. */ 1479 if (data && data[IFLA_MACVLAN_MODE]) { 1480 set_mode = true; 1481 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1482 /* Passthrough mode can't be set or cleared dynamically */ 1483 if ((mode == MACVLAN_MODE_PASSTHRU) != 1484 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1485 return -EINVAL; 1486 if (vlan->mode == MACVLAN_MODE_SOURCE && 1487 vlan->mode != mode) 1488 macvlan_flush_sources(vlan->port, vlan); 1489 } 1490 1491 if (data && data[IFLA_MACVLAN_FLAGS]) { 1492 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1493 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1494 if (macvlan_passthru(vlan->port) && promisc) { 1495 int err; 1496 1497 if (flags & MACVLAN_FLAG_NOPROMISC) 1498 err = dev_set_promiscuity(vlan->lowerdev, -1); 1499 else 1500 err = dev_set_promiscuity(vlan->lowerdev, 1); 1501 if (err < 0) 1502 return err; 1503 } 1504 vlan->flags = flags; 1505 } 1506 if (set_mode) 1507 vlan->mode = mode; 1508 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1509 if (vlan->mode != MACVLAN_MODE_SOURCE) 1510 return -EINVAL; 1511 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1512 ret = macvlan_changelink_sources(vlan, macmode, data); 1513 if (ret) 1514 return ret; 1515 } 1516 return 0; 1517 } 1518 1519 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1520 { 1521 if (vlan->macaddr_count == 0) 1522 return 0; 1523 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1524 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1525 } 1526 1527 static size_t macvlan_get_size(const struct net_device *dev) 1528 { 1529 struct macvlan_dev *vlan = netdev_priv(dev); 1530 1531 return (0 1532 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1533 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1534 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1535 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1536 ); 1537 } 1538 1539 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1540 const struct macvlan_dev *vlan, 1541 const int i) 1542 { 1543 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1544 struct macvlan_source_entry *entry; 1545 1546 hlist_for_each_entry_rcu(entry, h, hlist) { 1547 if (entry->vlan != vlan) 1548 continue; 1549 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1550 return 1; 1551 } 1552 return 0; 1553 } 1554 1555 static int macvlan_fill_info(struct sk_buff *skb, 1556 const struct net_device *dev) 1557 { 1558 struct macvlan_dev *vlan = netdev_priv(dev); 1559 int i; 1560 struct nlattr *nest; 1561 1562 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1563 goto nla_put_failure; 1564 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1565 goto nla_put_failure; 1566 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1567 goto nla_put_failure; 1568 if (vlan->macaddr_count > 0) { 1569 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1570 if (nest == NULL) 1571 goto nla_put_failure; 1572 1573 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1574 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1575 goto nla_put_failure; 1576 } 1577 nla_nest_end(skb, nest); 1578 } 1579 return 0; 1580 1581 nla_put_failure: 1582 return -EMSGSIZE; 1583 } 1584 1585 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1586 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1587 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1588 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1589 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1590 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1591 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1592 }; 1593 1594 int macvlan_link_register(struct rtnl_link_ops *ops) 1595 { 1596 /* common fields */ 1597 ops->validate = macvlan_validate; 1598 ops->maxtype = IFLA_MACVLAN_MAX; 1599 ops->policy = macvlan_policy; 1600 ops->changelink = macvlan_changelink; 1601 ops->get_size = macvlan_get_size; 1602 ops->fill_info = macvlan_fill_info; 1603 1604 return rtnl_link_register(ops); 1605 }; 1606 EXPORT_SYMBOL_GPL(macvlan_link_register); 1607 1608 static struct net *macvlan_get_link_net(const struct net_device *dev) 1609 { 1610 return dev_net(macvlan_dev_real_dev(dev)); 1611 } 1612 1613 static struct rtnl_link_ops macvlan_link_ops = { 1614 .kind = "macvlan", 1615 .setup = macvlan_setup, 1616 .newlink = macvlan_newlink, 1617 .dellink = macvlan_dellink, 1618 .get_link_net = macvlan_get_link_net, 1619 .priv_size = sizeof(struct macvlan_dev), 1620 }; 1621 1622 static int macvlan_device_event(struct notifier_block *unused, 1623 unsigned long event, void *ptr) 1624 { 1625 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1626 struct macvlan_dev *vlan, *next; 1627 struct macvlan_port *port; 1628 LIST_HEAD(list_kill); 1629 1630 if (!macvlan_port_exists(dev)) 1631 return NOTIFY_DONE; 1632 1633 port = macvlan_port_get_rtnl(dev); 1634 1635 switch (event) { 1636 case NETDEV_UP: 1637 case NETDEV_CHANGE: 1638 list_for_each_entry(vlan, &port->vlans, list) 1639 netif_stacked_transfer_operstate(vlan->lowerdev, 1640 vlan->dev); 1641 break; 1642 case NETDEV_FEAT_CHANGE: 1643 list_for_each_entry(vlan, &port->vlans, list) { 1644 vlan->dev->gso_max_size = dev->gso_max_size; 1645 vlan->dev->gso_max_segs = dev->gso_max_segs; 1646 netdev_update_features(vlan->dev); 1647 } 1648 break; 1649 case NETDEV_CHANGEMTU: 1650 list_for_each_entry(vlan, &port->vlans, list) { 1651 if (vlan->dev->mtu <= dev->mtu) 1652 continue; 1653 dev_set_mtu(vlan->dev, dev->mtu); 1654 } 1655 break; 1656 case NETDEV_CHANGEADDR: 1657 if (!macvlan_passthru(port)) 1658 return NOTIFY_DONE; 1659 1660 vlan = list_first_entry_or_null(&port->vlans, 1661 struct macvlan_dev, 1662 list); 1663 1664 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1665 return NOTIFY_BAD; 1666 1667 break; 1668 case NETDEV_UNREGISTER: 1669 /* twiddle thumbs on netns device moves */ 1670 if (dev->reg_state != NETREG_UNREGISTERING) 1671 break; 1672 1673 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1674 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1675 unregister_netdevice_many(&list_kill); 1676 break; 1677 case NETDEV_PRE_TYPE_CHANGE: 1678 /* Forbid underlaying device to change its type. */ 1679 return NOTIFY_BAD; 1680 1681 case NETDEV_NOTIFY_PEERS: 1682 case NETDEV_BONDING_FAILOVER: 1683 case NETDEV_RESEND_IGMP: 1684 /* Propagate to all vlans */ 1685 list_for_each_entry(vlan, &port->vlans, list) 1686 call_netdevice_notifiers(event, vlan->dev); 1687 } 1688 return NOTIFY_DONE; 1689 } 1690 1691 static struct notifier_block macvlan_notifier_block __read_mostly = { 1692 .notifier_call = macvlan_device_event, 1693 }; 1694 1695 static int __init macvlan_init_module(void) 1696 { 1697 int err; 1698 1699 register_netdevice_notifier(&macvlan_notifier_block); 1700 1701 err = macvlan_link_register(&macvlan_link_ops); 1702 if (err < 0) 1703 goto err1; 1704 return 0; 1705 err1: 1706 unregister_netdevice_notifier(&macvlan_notifier_block); 1707 return err; 1708 } 1709 1710 static void __exit macvlan_cleanup_module(void) 1711 { 1712 rtnl_link_unregister(&macvlan_link_ops); 1713 unregister_netdevice_notifier(&macvlan_notifier_block); 1714 } 1715 1716 module_init(macvlan_init_module); 1717 module_exit(macvlan_cleanup_module); 1718 1719 MODULE_LICENSE("GPL"); 1720 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1721 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1722 MODULE_ALIAS_RTNL_LINK("macvlan"); 1723