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 return dev_set_mac_address(vlan->lowerdev, addr); 753 } 754 755 return macvlan_sync_address(dev, addr->sa_data); 756 } 757 758 static void macvlan_change_rx_flags(struct net_device *dev, int change) 759 { 760 struct macvlan_dev *vlan = netdev_priv(dev); 761 struct net_device *lowerdev = vlan->lowerdev; 762 763 if (dev->flags & IFF_UP) { 764 if (change & IFF_ALLMULTI) 765 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 766 if (change & IFF_PROMISC) 767 dev_set_promiscuity(lowerdev, 768 dev->flags & IFF_PROMISC ? 1 : -1); 769 770 } 771 } 772 773 static void macvlan_compute_filter(unsigned long *mc_filter, 774 struct net_device *dev, 775 struct macvlan_dev *vlan) 776 { 777 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 778 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 779 } else { 780 struct netdev_hw_addr *ha; 781 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 782 783 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 784 netdev_for_each_mc_addr(ha, dev) { 785 __set_bit(mc_hash(vlan, ha->addr), filter); 786 } 787 788 __set_bit(mc_hash(vlan, dev->broadcast), filter); 789 790 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 791 } 792 } 793 794 static void macvlan_set_mac_lists(struct net_device *dev) 795 { 796 struct macvlan_dev *vlan = netdev_priv(dev); 797 798 macvlan_compute_filter(vlan->mc_filter, dev, vlan); 799 800 dev_uc_sync(vlan->lowerdev, dev); 801 dev_mc_sync(vlan->lowerdev, dev); 802 803 /* This is slightly inaccurate as we're including the subscription 804 * list of vlan->lowerdev too. 805 * 806 * Bug alert: This only works if everyone has the same broadcast 807 * address as lowerdev. As soon as someone changes theirs this 808 * will break. 809 * 810 * However, this is already broken as when you change your broadcast 811 * address we don't get called. 812 * 813 * The solution is to maintain a list of broadcast addresses like 814 * we do for uc/mc, if you care. 815 */ 816 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); 817 } 818 819 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 820 { 821 struct macvlan_dev *vlan = netdev_priv(dev); 822 823 if (vlan->lowerdev->mtu < new_mtu) 824 return -EINVAL; 825 dev->mtu = new_mtu; 826 return 0; 827 } 828 829 /* 830 * macvlan network devices have devices nesting below it and are a special 831 * "super class" of normal network devices; split their locks off into a 832 * separate class since they always nest. 833 */ 834 static struct lock_class_key macvlan_netdev_addr_lock_key; 835 836 #define ALWAYS_ON_OFFLOADS \ 837 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ 838 NETIF_F_GSO_ROBUST) 839 840 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX) 841 842 #define MACVLAN_FEATURES \ 843 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 844 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \ 845 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 846 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 847 848 #define MACVLAN_STATE_MASK \ 849 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 850 851 static int macvlan_get_nest_level(struct net_device *dev) 852 { 853 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 854 } 855 856 static void macvlan_set_lockdep_class(struct net_device *dev) 857 { 858 netdev_lockdep_set_classes(dev); 859 lockdep_set_class_and_subclass(&dev->addr_list_lock, 860 &macvlan_netdev_addr_lock_key, 861 macvlan_get_nest_level(dev)); 862 } 863 864 static int macvlan_init(struct net_device *dev) 865 { 866 struct macvlan_dev *vlan = netdev_priv(dev); 867 const struct net_device *lowerdev = vlan->lowerdev; 868 struct macvlan_port *port = vlan->port; 869 870 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 871 (lowerdev->state & MACVLAN_STATE_MASK); 872 dev->features = lowerdev->features & MACVLAN_FEATURES; 873 dev->features |= ALWAYS_ON_FEATURES; 874 dev->hw_features |= NETIF_F_LRO; 875 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 876 dev->vlan_features |= ALWAYS_ON_OFFLOADS; 877 dev->gso_max_size = lowerdev->gso_max_size; 878 dev->gso_max_segs = lowerdev->gso_max_segs; 879 dev->hard_header_len = lowerdev->hard_header_len; 880 881 macvlan_set_lockdep_class(dev); 882 883 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 884 if (!vlan->pcpu_stats) 885 return -ENOMEM; 886 887 port->count += 1; 888 889 return 0; 890 } 891 892 static void macvlan_uninit(struct net_device *dev) 893 { 894 struct macvlan_dev *vlan = netdev_priv(dev); 895 struct macvlan_port *port = vlan->port; 896 897 free_percpu(vlan->pcpu_stats); 898 899 macvlan_flush_sources(port, vlan); 900 port->count -= 1; 901 if (!port->count) 902 macvlan_port_destroy(port->dev); 903 } 904 905 static void macvlan_dev_get_stats64(struct net_device *dev, 906 struct rtnl_link_stats64 *stats) 907 { 908 struct macvlan_dev *vlan = netdev_priv(dev); 909 910 if (vlan->pcpu_stats) { 911 struct vlan_pcpu_stats *p; 912 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 913 u32 rx_errors = 0, tx_dropped = 0; 914 unsigned int start; 915 int i; 916 917 for_each_possible_cpu(i) { 918 p = per_cpu_ptr(vlan->pcpu_stats, i); 919 do { 920 start = u64_stats_fetch_begin_irq(&p->syncp); 921 rx_packets = p->rx_packets; 922 rx_bytes = p->rx_bytes; 923 rx_multicast = p->rx_multicast; 924 tx_packets = p->tx_packets; 925 tx_bytes = p->tx_bytes; 926 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 927 928 stats->rx_packets += rx_packets; 929 stats->rx_bytes += rx_bytes; 930 stats->multicast += rx_multicast; 931 stats->tx_packets += tx_packets; 932 stats->tx_bytes += tx_bytes; 933 /* rx_errors & tx_dropped are u32, updated 934 * without syncp protection. 935 */ 936 rx_errors += p->rx_errors; 937 tx_dropped += p->tx_dropped; 938 } 939 stats->rx_errors = rx_errors; 940 stats->rx_dropped = rx_errors; 941 stats->tx_dropped = tx_dropped; 942 } 943 } 944 945 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 946 __be16 proto, u16 vid) 947 { 948 struct macvlan_dev *vlan = netdev_priv(dev); 949 struct net_device *lowerdev = vlan->lowerdev; 950 951 return vlan_vid_add(lowerdev, proto, vid); 952 } 953 954 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 955 __be16 proto, u16 vid) 956 { 957 struct macvlan_dev *vlan = netdev_priv(dev); 958 struct net_device *lowerdev = vlan->lowerdev; 959 960 vlan_vid_del(lowerdev, proto, vid); 961 return 0; 962 } 963 964 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 965 struct net_device *dev, 966 const unsigned char *addr, u16 vid, 967 u16 flags) 968 { 969 struct macvlan_dev *vlan = netdev_priv(dev); 970 int err = -EINVAL; 971 972 /* Support unicast filter only on passthru devices. 973 * Multicast filter should be allowed on all devices. 974 */ 975 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 976 return -EOPNOTSUPP; 977 978 if (flags & NLM_F_REPLACE) 979 return -EOPNOTSUPP; 980 981 if (is_unicast_ether_addr(addr)) 982 err = dev_uc_add_excl(dev, addr); 983 else if (is_multicast_ether_addr(addr)) 984 err = dev_mc_add_excl(dev, addr); 985 986 return err; 987 } 988 989 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 990 struct net_device *dev, 991 const unsigned char *addr, u16 vid) 992 { 993 struct macvlan_dev *vlan = netdev_priv(dev); 994 int err = -EINVAL; 995 996 /* Support unicast filter only on passthru devices. 997 * Multicast filter should be allowed on all devices. 998 */ 999 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1000 return -EOPNOTSUPP; 1001 1002 if (is_unicast_ether_addr(addr)) 1003 err = dev_uc_del(dev, addr); 1004 else if (is_multicast_ether_addr(addr)) 1005 err = dev_mc_del(dev, addr); 1006 1007 return err; 1008 } 1009 1010 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 1011 struct ethtool_drvinfo *drvinfo) 1012 { 1013 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 1014 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 1015 } 1016 1017 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 1018 struct ethtool_link_ksettings *cmd) 1019 { 1020 const struct macvlan_dev *vlan = netdev_priv(dev); 1021 1022 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 1023 } 1024 1025 static netdev_features_t macvlan_fix_features(struct net_device *dev, 1026 netdev_features_t features) 1027 { 1028 struct macvlan_dev *vlan = netdev_priv(dev); 1029 netdev_features_t lowerdev_features = vlan->lowerdev->features; 1030 netdev_features_t mask; 1031 1032 features |= NETIF_F_ALL_FOR_ALL; 1033 features &= (vlan->set_features | ~MACVLAN_FEATURES); 1034 mask = features; 1035 1036 lowerdev_features &= (features | ~NETIF_F_LRO); 1037 features = netdev_increment_features(lowerdev_features, features, mask); 1038 features |= ALWAYS_ON_FEATURES; 1039 features &= ~NETIF_F_NETNS_LOCAL; 1040 1041 return features; 1042 } 1043 1044 #ifdef CONFIG_NET_POLL_CONTROLLER 1045 static void macvlan_dev_poll_controller(struct net_device *dev) 1046 { 1047 return; 1048 } 1049 1050 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 1051 { 1052 struct macvlan_dev *vlan = netdev_priv(dev); 1053 struct net_device *real_dev = vlan->lowerdev; 1054 struct netpoll *netpoll; 1055 int err = 0; 1056 1057 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 1058 err = -ENOMEM; 1059 if (!netpoll) 1060 goto out; 1061 1062 err = __netpoll_setup(netpoll, real_dev); 1063 if (err) { 1064 kfree(netpoll); 1065 goto out; 1066 } 1067 1068 vlan->netpoll = netpoll; 1069 1070 out: 1071 return err; 1072 } 1073 1074 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1075 { 1076 struct macvlan_dev *vlan = netdev_priv(dev); 1077 struct netpoll *netpoll = vlan->netpoll; 1078 1079 if (!netpoll) 1080 return; 1081 1082 vlan->netpoll = NULL; 1083 1084 __netpoll_free_async(netpoll); 1085 } 1086 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1087 1088 static int macvlan_dev_get_iflink(const struct net_device *dev) 1089 { 1090 struct macvlan_dev *vlan = netdev_priv(dev); 1091 1092 return vlan->lowerdev->ifindex; 1093 } 1094 1095 static const struct ethtool_ops macvlan_ethtool_ops = { 1096 .get_link = ethtool_op_get_link, 1097 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1098 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1099 }; 1100 1101 static const struct net_device_ops macvlan_netdev_ops = { 1102 .ndo_init = macvlan_init, 1103 .ndo_uninit = macvlan_uninit, 1104 .ndo_open = macvlan_open, 1105 .ndo_stop = macvlan_stop, 1106 .ndo_start_xmit = macvlan_start_xmit, 1107 .ndo_change_mtu = macvlan_change_mtu, 1108 .ndo_fix_features = macvlan_fix_features, 1109 .ndo_change_rx_flags = macvlan_change_rx_flags, 1110 .ndo_set_mac_address = macvlan_set_mac_address, 1111 .ndo_set_rx_mode = macvlan_set_mac_lists, 1112 .ndo_get_stats64 = macvlan_dev_get_stats64, 1113 .ndo_validate_addr = eth_validate_addr, 1114 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1115 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1116 .ndo_fdb_add = macvlan_fdb_add, 1117 .ndo_fdb_del = macvlan_fdb_del, 1118 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1119 .ndo_get_lock_subclass = macvlan_get_nest_level, 1120 #ifdef CONFIG_NET_POLL_CONTROLLER 1121 .ndo_poll_controller = macvlan_dev_poll_controller, 1122 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1123 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1124 #endif 1125 .ndo_get_iflink = macvlan_dev_get_iflink, 1126 .ndo_features_check = passthru_features_check, 1127 }; 1128 1129 void macvlan_common_setup(struct net_device *dev) 1130 { 1131 ether_setup(dev); 1132 1133 dev->min_mtu = 0; 1134 dev->max_mtu = ETH_MAX_MTU; 1135 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1136 netif_keep_dst(dev); 1137 dev->priv_flags |= IFF_UNICAST_FLT; 1138 dev->netdev_ops = &macvlan_netdev_ops; 1139 dev->needs_free_netdev = true; 1140 dev->header_ops = &macvlan_hard_header_ops; 1141 dev->ethtool_ops = &macvlan_ethtool_ops; 1142 } 1143 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1144 1145 static void macvlan_setup(struct net_device *dev) 1146 { 1147 macvlan_common_setup(dev); 1148 dev->priv_flags |= IFF_NO_QUEUE; 1149 } 1150 1151 static int macvlan_port_create(struct net_device *dev) 1152 { 1153 struct macvlan_port *port; 1154 unsigned int i; 1155 int err; 1156 1157 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1158 return -EINVAL; 1159 1160 if (netdev_is_rx_handler_busy(dev)) 1161 return -EBUSY; 1162 1163 port = kzalloc(sizeof(*port), GFP_KERNEL); 1164 if (port == NULL) 1165 return -ENOMEM; 1166 1167 port->dev = dev; 1168 ether_addr_copy(port->perm_addr, dev->dev_addr); 1169 INIT_LIST_HEAD(&port->vlans); 1170 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1171 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1172 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1173 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1174 1175 skb_queue_head_init(&port->bc_queue); 1176 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1177 1178 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1179 if (err) 1180 kfree(port); 1181 else 1182 dev->priv_flags |= IFF_MACVLAN_PORT; 1183 return err; 1184 } 1185 1186 static void macvlan_port_destroy(struct net_device *dev) 1187 { 1188 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1189 struct sk_buff *skb; 1190 1191 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1192 netdev_rx_handler_unregister(dev); 1193 1194 /* After this point, no packet can schedule bc_work anymore, 1195 * but we need to cancel it and purge left skbs if any. 1196 */ 1197 cancel_work_sync(&port->bc_work); 1198 1199 while ((skb = __skb_dequeue(&port->bc_queue))) { 1200 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 1201 1202 if (src) 1203 dev_put(src->dev); 1204 1205 kfree_skb(skb); 1206 } 1207 1208 /* If the lower device address has been changed by passthru 1209 * macvlan, put it back. 1210 */ 1211 if (macvlan_passthru(port) && 1212 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { 1213 struct sockaddr sa; 1214 1215 sa.sa_family = port->dev->type; 1216 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len); 1217 dev_set_mac_address(port->dev, &sa); 1218 } 1219 1220 kfree(port); 1221 } 1222 1223 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[], 1224 struct netlink_ext_ack *extack) 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 struct netlink_ext_ack *extack) 1454 { 1455 return macvlan_common_newlink(src_net, dev, tb, data); 1456 } 1457 1458 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1459 { 1460 struct macvlan_dev *vlan = netdev_priv(dev); 1461 1462 if (vlan->mode == MACVLAN_MODE_SOURCE) 1463 macvlan_flush_sources(vlan->port, vlan); 1464 list_del_rcu(&vlan->list); 1465 unregister_netdevice_queue(dev, head); 1466 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1467 } 1468 EXPORT_SYMBOL_GPL(macvlan_dellink); 1469 1470 static int macvlan_changelink(struct net_device *dev, 1471 struct nlattr *tb[], struct nlattr *data[], 1472 struct netlink_ext_ack *extack) 1473 { 1474 struct macvlan_dev *vlan = netdev_priv(dev); 1475 enum macvlan_mode mode; 1476 bool set_mode = false; 1477 enum macvlan_macaddr_mode macmode; 1478 int ret; 1479 1480 /* Validate mode, but don't set yet: setting flags may fail. */ 1481 if (data && data[IFLA_MACVLAN_MODE]) { 1482 set_mode = true; 1483 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1484 /* Passthrough mode can't be set or cleared dynamically */ 1485 if ((mode == MACVLAN_MODE_PASSTHRU) != 1486 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1487 return -EINVAL; 1488 if (vlan->mode == MACVLAN_MODE_SOURCE && 1489 vlan->mode != mode) 1490 macvlan_flush_sources(vlan->port, vlan); 1491 } 1492 1493 if (data && data[IFLA_MACVLAN_FLAGS]) { 1494 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1495 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1496 if (macvlan_passthru(vlan->port) && promisc) { 1497 int err; 1498 1499 if (flags & MACVLAN_FLAG_NOPROMISC) 1500 err = dev_set_promiscuity(vlan->lowerdev, -1); 1501 else 1502 err = dev_set_promiscuity(vlan->lowerdev, 1); 1503 if (err < 0) 1504 return err; 1505 } 1506 vlan->flags = flags; 1507 } 1508 if (set_mode) 1509 vlan->mode = mode; 1510 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1511 if (vlan->mode != MACVLAN_MODE_SOURCE) 1512 return -EINVAL; 1513 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1514 ret = macvlan_changelink_sources(vlan, macmode, data); 1515 if (ret) 1516 return ret; 1517 } 1518 return 0; 1519 } 1520 1521 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1522 { 1523 if (vlan->macaddr_count == 0) 1524 return 0; 1525 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1526 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1527 } 1528 1529 static size_t macvlan_get_size(const struct net_device *dev) 1530 { 1531 struct macvlan_dev *vlan = netdev_priv(dev); 1532 1533 return (0 1534 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1535 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1536 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1537 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1538 ); 1539 } 1540 1541 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1542 const struct macvlan_dev *vlan, 1543 const int i) 1544 { 1545 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1546 struct macvlan_source_entry *entry; 1547 1548 hlist_for_each_entry_rcu(entry, h, hlist) { 1549 if (entry->vlan != vlan) 1550 continue; 1551 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1552 return 1; 1553 } 1554 return 0; 1555 } 1556 1557 static int macvlan_fill_info(struct sk_buff *skb, 1558 const struct net_device *dev) 1559 { 1560 struct macvlan_dev *vlan = netdev_priv(dev); 1561 int i; 1562 struct nlattr *nest; 1563 1564 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1565 goto nla_put_failure; 1566 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1567 goto nla_put_failure; 1568 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1569 goto nla_put_failure; 1570 if (vlan->macaddr_count > 0) { 1571 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1572 if (nest == NULL) 1573 goto nla_put_failure; 1574 1575 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1576 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1577 goto nla_put_failure; 1578 } 1579 nla_nest_end(skb, nest); 1580 } 1581 return 0; 1582 1583 nla_put_failure: 1584 return -EMSGSIZE; 1585 } 1586 1587 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1588 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1589 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1590 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1591 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1592 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1593 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1594 }; 1595 1596 int macvlan_link_register(struct rtnl_link_ops *ops) 1597 { 1598 /* common fields */ 1599 ops->validate = macvlan_validate; 1600 ops->maxtype = IFLA_MACVLAN_MAX; 1601 ops->policy = macvlan_policy; 1602 ops->changelink = macvlan_changelink; 1603 ops->get_size = macvlan_get_size; 1604 ops->fill_info = macvlan_fill_info; 1605 1606 return rtnl_link_register(ops); 1607 }; 1608 EXPORT_SYMBOL_GPL(macvlan_link_register); 1609 1610 static struct net *macvlan_get_link_net(const struct net_device *dev) 1611 { 1612 return dev_net(macvlan_dev_real_dev(dev)); 1613 } 1614 1615 static struct rtnl_link_ops macvlan_link_ops = { 1616 .kind = "macvlan", 1617 .setup = macvlan_setup, 1618 .newlink = macvlan_newlink, 1619 .dellink = macvlan_dellink, 1620 .get_link_net = macvlan_get_link_net, 1621 .priv_size = sizeof(struct macvlan_dev), 1622 }; 1623 1624 static int macvlan_device_event(struct notifier_block *unused, 1625 unsigned long event, void *ptr) 1626 { 1627 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1628 struct macvlan_dev *vlan, *next; 1629 struct macvlan_port *port; 1630 LIST_HEAD(list_kill); 1631 1632 if (!macvlan_port_exists(dev)) 1633 return NOTIFY_DONE; 1634 1635 port = macvlan_port_get_rtnl(dev); 1636 1637 switch (event) { 1638 case NETDEV_UP: 1639 case NETDEV_CHANGE: 1640 list_for_each_entry(vlan, &port->vlans, list) 1641 netif_stacked_transfer_operstate(vlan->lowerdev, 1642 vlan->dev); 1643 break; 1644 case NETDEV_FEAT_CHANGE: 1645 list_for_each_entry(vlan, &port->vlans, list) { 1646 vlan->dev->gso_max_size = dev->gso_max_size; 1647 vlan->dev->gso_max_segs = dev->gso_max_segs; 1648 netdev_update_features(vlan->dev); 1649 } 1650 break; 1651 case NETDEV_CHANGEMTU: 1652 list_for_each_entry(vlan, &port->vlans, list) { 1653 if (vlan->dev->mtu <= dev->mtu) 1654 continue; 1655 dev_set_mtu(vlan->dev, dev->mtu); 1656 } 1657 break; 1658 case NETDEV_CHANGEADDR: 1659 if (!macvlan_passthru(port)) 1660 return NOTIFY_DONE; 1661 1662 vlan = list_first_entry_or_null(&port->vlans, 1663 struct macvlan_dev, 1664 list); 1665 1666 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1667 return NOTIFY_BAD; 1668 1669 break; 1670 case NETDEV_UNREGISTER: 1671 /* twiddle thumbs on netns device moves */ 1672 if (dev->reg_state != NETREG_UNREGISTERING) 1673 break; 1674 1675 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1676 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1677 unregister_netdevice_many(&list_kill); 1678 break; 1679 case NETDEV_PRE_TYPE_CHANGE: 1680 /* Forbid underlaying device to change its type. */ 1681 return NOTIFY_BAD; 1682 1683 case NETDEV_NOTIFY_PEERS: 1684 case NETDEV_BONDING_FAILOVER: 1685 case NETDEV_RESEND_IGMP: 1686 /* Propagate to all vlans */ 1687 list_for_each_entry(vlan, &port->vlans, list) 1688 call_netdevice_notifiers(event, vlan->dev); 1689 } 1690 return NOTIFY_DONE; 1691 } 1692 1693 static struct notifier_block macvlan_notifier_block __read_mostly = { 1694 .notifier_call = macvlan_device_event, 1695 }; 1696 1697 static int __init macvlan_init_module(void) 1698 { 1699 int err; 1700 1701 register_netdevice_notifier(&macvlan_notifier_block); 1702 1703 err = macvlan_link_register(&macvlan_link_ops); 1704 if (err < 0) 1705 goto err1; 1706 return 0; 1707 err1: 1708 unregister_netdevice_notifier(&macvlan_notifier_block); 1709 return err; 1710 } 1711 1712 static void __exit macvlan_cleanup_module(void) 1713 { 1714 rtnl_link_unregister(&macvlan_link_ops); 1715 unregister_netdevice_notifier(&macvlan_notifier_block); 1716 } 1717 1718 module_init(macvlan_init_module); 1719 module_exit(macvlan_cleanup_module); 1720 1721 MODULE_LICENSE("GPL"); 1722 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1723 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1724 MODULE_ALIAS_RTNL_LINK("macvlan"); 1725