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; 416 417 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr)) 418 nskb->pkt_type = PACKET_HOST; 419 420 ret = netif_rx(nskb); 421 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 422 } 423 424 static void macvlan_forward_source(struct sk_buff *skb, 425 struct macvlan_port *port, 426 const unsigned char *addr) 427 { 428 struct macvlan_source_entry *entry; 429 u32 idx = macvlan_eth_hash(addr); 430 struct hlist_head *h = &port->vlan_source_hash[idx]; 431 432 hlist_for_each_entry_rcu(entry, h, hlist) { 433 if (ether_addr_equal_64bits(entry->addr, addr)) 434 macvlan_forward_source_one(skb, entry->vlan); 435 } 436 } 437 438 /* called under rcu_read_lock() from netif_receive_skb */ 439 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 440 { 441 struct macvlan_port *port; 442 struct sk_buff *skb = *pskb; 443 const struct ethhdr *eth = eth_hdr(skb); 444 const struct macvlan_dev *vlan; 445 const struct macvlan_dev *src; 446 struct net_device *dev; 447 unsigned int len = 0; 448 int ret; 449 rx_handler_result_t handle_res; 450 451 port = macvlan_port_get_rcu(skb->dev); 452 if (is_multicast_ether_addr(eth->h_dest)) { 453 unsigned int hash; 454 455 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); 456 if (!skb) 457 return RX_HANDLER_CONSUMED; 458 *pskb = skb; 459 eth = eth_hdr(skb); 460 macvlan_forward_source(skb, port, eth->h_source); 461 src = macvlan_hash_lookup(port, eth->h_source); 462 if (src && src->mode != MACVLAN_MODE_VEPA && 463 src->mode != MACVLAN_MODE_BRIDGE) { 464 /* forward to original port. */ 465 vlan = src; 466 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 467 netif_rx(skb); 468 handle_res = RX_HANDLER_CONSUMED; 469 goto out; 470 } 471 472 hash = mc_hash(NULL, eth->h_dest); 473 if (test_bit(hash, port->mc_filter)) 474 macvlan_broadcast_enqueue(port, src, skb); 475 476 return RX_HANDLER_PASS; 477 } 478 479 macvlan_forward_source(skb, port, eth->h_source); 480 if (macvlan_passthru(port)) 481 vlan = list_first_or_null_rcu(&port->vlans, 482 struct macvlan_dev, list); 483 else 484 vlan = macvlan_hash_lookup(port, eth->h_dest); 485 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE) 486 return RX_HANDLER_PASS; 487 488 dev = vlan->dev; 489 if (unlikely(!(dev->flags & IFF_UP))) { 490 kfree_skb(skb); 491 return RX_HANDLER_CONSUMED; 492 } 493 len = skb->len + ETH_HLEN; 494 skb = skb_share_check(skb, GFP_ATOMIC); 495 if (!skb) { 496 ret = NET_RX_DROP; 497 handle_res = RX_HANDLER_CONSUMED; 498 goto out; 499 } 500 501 *pskb = skb; 502 skb->dev = dev; 503 skb->pkt_type = PACKET_HOST; 504 505 ret = NET_RX_SUCCESS; 506 handle_res = RX_HANDLER_ANOTHER; 507 out: 508 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 509 return handle_res; 510 } 511 512 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 513 { 514 const struct macvlan_dev *vlan = netdev_priv(dev); 515 const struct macvlan_port *port = vlan->port; 516 const struct macvlan_dev *dest; 517 518 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 519 const struct ethhdr *eth = (void *)skb->data; 520 521 /* send to other bridge ports directly */ 522 if (is_multicast_ether_addr(eth->h_dest)) { 523 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 524 goto xmit_world; 525 } 526 527 dest = macvlan_hash_lookup(port, eth->h_dest); 528 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 529 /* send to lowerdev first for its network taps */ 530 dev_forward_skb(vlan->lowerdev, skb); 531 532 return NET_XMIT_SUCCESS; 533 } 534 } 535 536 xmit_world: 537 skb->dev = vlan->lowerdev; 538 return dev_queue_xmit(skb); 539 } 540 541 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 542 { 543 #ifdef CONFIG_NET_POLL_CONTROLLER 544 if (vlan->netpoll) 545 netpoll_send_skb(vlan->netpoll, skb); 546 #else 547 BUG(); 548 #endif 549 return NETDEV_TX_OK; 550 } 551 552 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 553 struct net_device *dev) 554 { 555 unsigned int len = skb->len; 556 int ret; 557 struct macvlan_dev *vlan = netdev_priv(dev); 558 559 if (unlikely(netpoll_tx_running(dev))) 560 return macvlan_netpoll_send_skb(vlan, skb); 561 562 if (vlan->fwd_priv) { 563 skb->dev = vlan->lowerdev; 564 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); 565 } else { 566 ret = macvlan_queue_xmit(skb, dev); 567 } 568 569 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 570 struct vlan_pcpu_stats *pcpu_stats; 571 572 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 573 u64_stats_update_begin(&pcpu_stats->syncp); 574 pcpu_stats->tx_packets++; 575 pcpu_stats->tx_bytes += len; 576 u64_stats_update_end(&pcpu_stats->syncp); 577 } else { 578 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 579 } 580 return ret; 581 } 582 583 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 584 unsigned short type, const void *daddr, 585 const void *saddr, unsigned len) 586 { 587 const struct macvlan_dev *vlan = netdev_priv(dev); 588 struct net_device *lowerdev = vlan->lowerdev; 589 590 return dev_hard_header(skb, lowerdev, type, daddr, 591 saddr ? : dev->dev_addr, len); 592 } 593 594 static const struct header_ops macvlan_hard_header_ops = { 595 .create = macvlan_hard_header, 596 .parse = eth_header_parse, 597 .cache = eth_header_cache, 598 .cache_update = eth_header_cache_update, 599 }; 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 vlan->fwd_priv = 618 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 619 620 /* If we get a NULL pointer back, or if we get an error 621 * then we should just fall through to the non accelerated path 622 */ 623 if (IS_ERR_OR_NULL(vlan->fwd_priv)) { 624 vlan->fwd_priv = NULL; 625 } else 626 return 0; 627 } 628 629 err = -EBUSY; 630 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 631 goto out; 632 633 err = dev_uc_add(lowerdev, dev->dev_addr); 634 if (err < 0) 635 goto out; 636 if (dev->flags & IFF_ALLMULTI) { 637 err = dev_set_allmulti(lowerdev, 1); 638 if (err < 0) 639 goto del_unicast; 640 } 641 642 if (dev->flags & IFF_PROMISC) { 643 err = dev_set_promiscuity(lowerdev, 1); 644 if (err < 0) 645 goto clear_multi; 646 } 647 648 hash_add: 649 macvlan_hash_add(vlan); 650 return 0; 651 652 clear_multi: 653 if (dev->flags & IFF_ALLMULTI) 654 dev_set_allmulti(lowerdev, -1); 655 del_unicast: 656 dev_uc_del(lowerdev, dev->dev_addr); 657 out: 658 if (vlan->fwd_priv) { 659 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 660 vlan->fwd_priv); 661 vlan->fwd_priv = NULL; 662 } 663 return err; 664 } 665 666 static int macvlan_stop(struct net_device *dev) 667 { 668 struct macvlan_dev *vlan = netdev_priv(dev); 669 struct net_device *lowerdev = vlan->lowerdev; 670 671 if (vlan->fwd_priv) { 672 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 673 vlan->fwd_priv); 674 vlan->fwd_priv = NULL; 675 return 0; 676 } 677 678 dev_uc_unsync(lowerdev, dev); 679 dev_mc_unsync(lowerdev, dev); 680 681 if (macvlan_passthru(vlan->port)) { 682 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 683 dev_set_promiscuity(lowerdev, -1); 684 goto hash_del; 685 } 686 687 if (dev->flags & IFF_ALLMULTI) 688 dev_set_allmulti(lowerdev, -1); 689 690 if (dev->flags & IFF_PROMISC) 691 dev_set_promiscuity(lowerdev, -1); 692 693 dev_uc_del(lowerdev, dev->dev_addr); 694 695 hash_del: 696 macvlan_hash_del(vlan, !dev->dismantle); 697 return 0; 698 } 699 700 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 701 { 702 struct macvlan_dev *vlan = netdev_priv(dev); 703 struct net_device *lowerdev = vlan->lowerdev; 704 struct macvlan_port *port = vlan->port; 705 int err; 706 707 if (!(dev->flags & IFF_UP)) { 708 /* Just copy in the new address */ 709 ether_addr_copy(dev->dev_addr, addr); 710 } else { 711 /* Rehash and update the device filters */ 712 if (macvlan_addr_busy(vlan->port, addr)) 713 return -EBUSY; 714 715 if (!macvlan_passthru(port)) { 716 err = dev_uc_add(lowerdev, addr); 717 if (err) 718 return err; 719 720 dev_uc_del(lowerdev, dev->dev_addr); 721 } 722 723 macvlan_hash_change_addr(vlan, addr); 724 } 725 if (macvlan_passthru(port) && !macvlan_addr_change(port)) { 726 /* Since addr_change isn't set, we are here due to lower 727 * device change. Save the lower-dev address so we can 728 * restore it later. 729 */ 730 ether_addr_copy(vlan->port->perm_addr, 731 lowerdev->dev_addr); 732 } 733 macvlan_clear_addr_change(port); 734 return 0; 735 } 736 737 static int macvlan_set_mac_address(struct net_device *dev, void *p) 738 { 739 struct macvlan_dev *vlan = netdev_priv(dev); 740 struct sockaddr *addr = p; 741 742 if (!is_valid_ether_addr(addr->sa_data)) 743 return -EADDRNOTAVAIL; 744 745 /* If the addresses are the same, this is a no-op */ 746 if (ether_addr_equal(dev->dev_addr, addr->sa_data)) 747 return 0; 748 749 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 750 macvlan_set_addr_change(vlan->port); 751 return dev_set_mac_address(vlan->lowerdev, addr); 752 } 753 754 return macvlan_sync_address(dev, addr->sa_data); 755 } 756 757 static void macvlan_change_rx_flags(struct net_device *dev, int change) 758 { 759 struct macvlan_dev *vlan = netdev_priv(dev); 760 struct net_device *lowerdev = vlan->lowerdev; 761 762 if (dev->flags & IFF_UP) { 763 if (change & IFF_ALLMULTI) 764 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 765 if (change & IFF_PROMISC) 766 dev_set_promiscuity(lowerdev, 767 dev->flags & IFF_PROMISC ? 1 : -1); 768 769 } 770 } 771 772 static void macvlan_compute_filter(unsigned long *mc_filter, 773 struct net_device *dev, 774 struct macvlan_dev *vlan) 775 { 776 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 777 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 778 } else { 779 struct netdev_hw_addr *ha; 780 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 781 782 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 783 netdev_for_each_mc_addr(ha, dev) { 784 __set_bit(mc_hash(vlan, ha->addr), filter); 785 } 786 787 __set_bit(mc_hash(vlan, dev->broadcast), filter); 788 789 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 790 } 791 } 792 793 static void macvlan_set_mac_lists(struct net_device *dev) 794 { 795 struct macvlan_dev *vlan = netdev_priv(dev); 796 797 macvlan_compute_filter(vlan->mc_filter, dev, vlan); 798 799 dev_uc_sync(vlan->lowerdev, dev); 800 dev_mc_sync(vlan->lowerdev, dev); 801 802 /* This is slightly inaccurate as we're including the subscription 803 * list of vlan->lowerdev too. 804 * 805 * Bug alert: This only works if everyone has the same broadcast 806 * address as lowerdev. As soon as someone changes theirs this 807 * will break. 808 * 809 * However, this is already broken as when you change your broadcast 810 * address we don't get called. 811 * 812 * The solution is to maintain a list of broadcast addresses like 813 * we do for uc/mc, if you care. 814 */ 815 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); 816 } 817 818 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 819 { 820 struct macvlan_dev *vlan = netdev_priv(dev); 821 822 if (vlan->lowerdev->mtu < new_mtu) 823 return -EINVAL; 824 dev->mtu = new_mtu; 825 return 0; 826 } 827 828 /* 829 * macvlan network devices have devices nesting below it and are a special 830 * "super class" of normal network devices; split their locks off into a 831 * separate class since they always nest. 832 */ 833 static struct lock_class_key macvlan_netdev_addr_lock_key; 834 835 #define ALWAYS_ON_OFFLOADS \ 836 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ 837 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL) 838 839 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX) 840 841 #define MACVLAN_FEATURES \ 842 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 843 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \ 844 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 845 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 846 847 #define MACVLAN_STATE_MASK \ 848 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 849 850 static int macvlan_get_nest_level(struct net_device *dev) 851 { 852 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 853 } 854 855 static void macvlan_set_lockdep_class(struct net_device *dev) 856 { 857 netdev_lockdep_set_classes(dev); 858 lockdep_set_class_and_subclass(&dev->addr_list_lock, 859 &macvlan_netdev_addr_lock_key, 860 macvlan_get_nest_level(dev)); 861 } 862 863 static int macvlan_init(struct net_device *dev) 864 { 865 struct macvlan_dev *vlan = netdev_priv(dev); 866 const struct net_device *lowerdev = vlan->lowerdev; 867 struct macvlan_port *port = vlan->port; 868 869 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 870 (lowerdev->state & MACVLAN_STATE_MASK); 871 dev->features = lowerdev->features & MACVLAN_FEATURES; 872 dev->features |= ALWAYS_ON_FEATURES; 873 dev->hw_features |= NETIF_F_LRO; 874 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 875 dev->vlan_features |= ALWAYS_ON_OFFLOADS; 876 dev->hw_enc_features |= dev->features; 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 &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES); 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) 1234 return 0; 1235 1236 if (data[IFLA_MACVLAN_FLAGS] && 1237 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1238 return -EINVAL; 1239 1240 if (data[IFLA_MACVLAN_MODE]) { 1241 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1242 case MACVLAN_MODE_PRIVATE: 1243 case MACVLAN_MODE_VEPA: 1244 case MACVLAN_MODE_BRIDGE: 1245 case MACVLAN_MODE_PASSTHRU: 1246 case MACVLAN_MODE_SOURCE: 1247 break; 1248 default: 1249 return -EINVAL; 1250 } 1251 } 1252 1253 if (data[IFLA_MACVLAN_MACADDR_MODE]) { 1254 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1255 case MACVLAN_MACADDR_ADD: 1256 case MACVLAN_MACADDR_DEL: 1257 case MACVLAN_MACADDR_FLUSH: 1258 case MACVLAN_MACADDR_SET: 1259 break; 1260 default: 1261 return -EINVAL; 1262 } 1263 } 1264 1265 if (data[IFLA_MACVLAN_MACADDR]) { 1266 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1267 return -EINVAL; 1268 1269 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1270 return -EADDRNOTAVAIL; 1271 } 1272 1273 if (data[IFLA_MACVLAN_MACADDR_COUNT]) 1274 return -EINVAL; 1275 1276 return 0; 1277 } 1278 1279 /** 1280 * reconfigure list of remote source mac address 1281 * (only for macvlan devices in source mode) 1282 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1283 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1284 */ 1285 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1286 struct nlattr *data[]) 1287 { 1288 char *addr = NULL; 1289 int ret, rem, len; 1290 struct nlattr *nla, *head; 1291 struct macvlan_source_entry *entry; 1292 1293 if (data[IFLA_MACVLAN_MACADDR]) 1294 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1295 1296 if (mode == MACVLAN_MACADDR_ADD) { 1297 if (!addr) 1298 return -EINVAL; 1299 1300 return macvlan_hash_add_source(vlan, addr); 1301 1302 } else if (mode == MACVLAN_MACADDR_DEL) { 1303 if (!addr) 1304 return -EINVAL; 1305 1306 entry = macvlan_hash_lookup_source(vlan, addr); 1307 if (entry) { 1308 macvlan_hash_del_source(entry); 1309 vlan->macaddr_count--; 1310 } 1311 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1312 macvlan_flush_sources(vlan->port, vlan); 1313 } else if (mode == MACVLAN_MACADDR_SET) { 1314 macvlan_flush_sources(vlan->port, vlan); 1315 1316 if (addr) { 1317 ret = macvlan_hash_add_source(vlan, addr); 1318 if (ret) 1319 return ret; 1320 } 1321 1322 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1323 return 0; 1324 1325 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1326 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1327 1328 nla_for_each_attr(nla, head, len, rem) { 1329 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1330 nla_len(nla) != ETH_ALEN) 1331 continue; 1332 1333 addr = nla_data(nla); 1334 ret = macvlan_hash_add_source(vlan, addr); 1335 if (ret) 1336 return ret; 1337 } 1338 } else { 1339 return -EINVAL; 1340 } 1341 1342 return 0; 1343 } 1344 1345 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1346 struct nlattr *tb[], struct nlattr *data[], 1347 struct netlink_ext_ack *extack) 1348 { 1349 struct macvlan_dev *vlan = netdev_priv(dev); 1350 struct macvlan_port *port; 1351 struct net_device *lowerdev; 1352 int err; 1353 int macmode; 1354 bool create = false; 1355 1356 if (!tb[IFLA_LINK]) 1357 return -EINVAL; 1358 1359 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1360 if (lowerdev == NULL) 1361 return -ENODEV; 1362 1363 /* When creating macvlans or macvtaps on top of other macvlans - use 1364 * the real device as the lowerdev. 1365 */ 1366 if (netif_is_macvlan(lowerdev)) 1367 lowerdev = macvlan_dev_real_dev(lowerdev); 1368 1369 if (!tb[IFLA_MTU]) 1370 dev->mtu = lowerdev->mtu; 1371 else if (dev->mtu > lowerdev->mtu) 1372 return -EINVAL; 1373 1374 /* MTU range: 68 - lowerdev->max_mtu */ 1375 dev->min_mtu = ETH_MIN_MTU; 1376 dev->max_mtu = lowerdev->max_mtu; 1377 1378 if (!tb[IFLA_ADDRESS]) 1379 eth_hw_addr_random(dev); 1380 1381 if (!macvlan_port_exists(lowerdev)) { 1382 err = macvlan_port_create(lowerdev); 1383 if (err < 0) 1384 return err; 1385 create = true; 1386 } 1387 port = macvlan_port_get_rtnl(lowerdev); 1388 1389 /* Only 1 macvlan device can be created in passthru mode */ 1390 if (macvlan_passthru(port)) { 1391 /* The macvlan port must be not created this time, 1392 * still goto destroy_macvlan_port for readability. 1393 */ 1394 err = -EINVAL; 1395 goto destroy_macvlan_port; 1396 } 1397 1398 vlan->lowerdev = lowerdev; 1399 vlan->dev = dev; 1400 vlan->port = port; 1401 vlan->set_features = MACVLAN_FEATURES; 1402 vlan->nest_level = dev_get_nest_level(lowerdev) + 1; 1403 1404 vlan->mode = MACVLAN_MODE_VEPA; 1405 if (data && data[IFLA_MACVLAN_MODE]) 1406 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1407 1408 if (data && data[IFLA_MACVLAN_FLAGS]) 1409 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1410 1411 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1412 if (port->count) { 1413 err = -EINVAL; 1414 goto destroy_macvlan_port; 1415 } 1416 macvlan_set_passthru(port); 1417 eth_hw_addr_inherit(dev, lowerdev); 1418 } 1419 1420 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1421 if (vlan->mode != MACVLAN_MODE_SOURCE) { 1422 err = -EINVAL; 1423 goto destroy_macvlan_port; 1424 } 1425 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1426 err = macvlan_changelink_sources(vlan, macmode, data); 1427 if (err) 1428 goto destroy_macvlan_port; 1429 } 1430 1431 err = register_netdevice(dev); 1432 if (err < 0) 1433 goto destroy_macvlan_port; 1434 1435 dev->priv_flags |= IFF_MACVLAN; 1436 err = netdev_upper_dev_link(lowerdev, dev, extack); 1437 if (err) 1438 goto unregister_netdev; 1439 1440 list_add_tail_rcu(&vlan->list, &port->vlans); 1441 netif_stacked_transfer_operstate(lowerdev, dev); 1442 linkwatch_fire_event(dev); 1443 1444 return 0; 1445 1446 unregister_netdev: 1447 /* macvlan_uninit would free the macvlan port */ 1448 unregister_netdevice(dev); 1449 return err; 1450 destroy_macvlan_port: 1451 /* the macvlan port may be freed by macvlan_uninit when fail to register. 1452 * so we destroy the macvlan port only when it's valid. 1453 */ 1454 if (create && macvlan_port_get_rtnl(lowerdev)) 1455 macvlan_port_destroy(port->dev); 1456 return err; 1457 } 1458 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1459 1460 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1461 struct nlattr *tb[], struct nlattr *data[], 1462 struct netlink_ext_ack *extack) 1463 { 1464 return macvlan_common_newlink(src_net, dev, tb, data, extack); 1465 } 1466 1467 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1468 { 1469 struct macvlan_dev *vlan = netdev_priv(dev); 1470 1471 if (vlan->mode == MACVLAN_MODE_SOURCE) 1472 macvlan_flush_sources(vlan->port, vlan); 1473 list_del_rcu(&vlan->list); 1474 unregister_netdevice_queue(dev, head); 1475 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1476 } 1477 EXPORT_SYMBOL_GPL(macvlan_dellink); 1478 1479 static int macvlan_changelink(struct net_device *dev, 1480 struct nlattr *tb[], struct nlattr *data[], 1481 struct netlink_ext_ack *extack) 1482 { 1483 struct macvlan_dev *vlan = netdev_priv(dev); 1484 enum macvlan_mode mode; 1485 bool set_mode = false; 1486 enum macvlan_macaddr_mode macmode; 1487 int ret; 1488 1489 /* Validate mode, but don't set yet: setting flags may fail. */ 1490 if (data && data[IFLA_MACVLAN_MODE]) { 1491 set_mode = true; 1492 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1493 /* Passthrough mode can't be set or cleared dynamically */ 1494 if ((mode == MACVLAN_MODE_PASSTHRU) != 1495 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1496 return -EINVAL; 1497 if (vlan->mode == MACVLAN_MODE_SOURCE && 1498 vlan->mode != mode) 1499 macvlan_flush_sources(vlan->port, vlan); 1500 } 1501 1502 if (data && data[IFLA_MACVLAN_FLAGS]) { 1503 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1504 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1505 if (macvlan_passthru(vlan->port) && promisc) { 1506 int err; 1507 1508 if (flags & MACVLAN_FLAG_NOPROMISC) 1509 err = dev_set_promiscuity(vlan->lowerdev, -1); 1510 else 1511 err = dev_set_promiscuity(vlan->lowerdev, 1); 1512 if (err < 0) 1513 return err; 1514 } 1515 vlan->flags = flags; 1516 } 1517 if (set_mode) 1518 vlan->mode = mode; 1519 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1520 if (vlan->mode != MACVLAN_MODE_SOURCE) 1521 return -EINVAL; 1522 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1523 ret = macvlan_changelink_sources(vlan, macmode, data); 1524 if (ret) 1525 return ret; 1526 } 1527 return 0; 1528 } 1529 1530 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1531 { 1532 if (vlan->macaddr_count == 0) 1533 return 0; 1534 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1535 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1536 } 1537 1538 static size_t macvlan_get_size(const struct net_device *dev) 1539 { 1540 struct macvlan_dev *vlan = netdev_priv(dev); 1541 1542 return (0 1543 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1544 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1545 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1546 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1547 ); 1548 } 1549 1550 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1551 const struct macvlan_dev *vlan, 1552 const int i) 1553 { 1554 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1555 struct macvlan_source_entry *entry; 1556 1557 hlist_for_each_entry_rcu(entry, h, hlist) { 1558 if (entry->vlan != vlan) 1559 continue; 1560 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1561 return 1; 1562 } 1563 return 0; 1564 } 1565 1566 static int macvlan_fill_info(struct sk_buff *skb, 1567 const struct net_device *dev) 1568 { 1569 struct macvlan_dev *vlan = netdev_priv(dev); 1570 int i; 1571 struct nlattr *nest; 1572 1573 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1574 goto nla_put_failure; 1575 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1576 goto nla_put_failure; 1577 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1578 goto nla_put_failure; 1579 if (vlan->macaddr_count > 0) { 1580 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1581 if (nest == NULL) 1582 goto nla_put_failure; 1583 1584 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1585 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1586 goto nla_put_failure; 1587 } 1588 nla_nest_end(skb, nest); 1589 } 1590 return 0; 1591 1592 nla_put_failure: 1593 return -EMSGSIZE; 1594 } 1595 1596 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1597 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1598 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1599 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1600 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1601 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1602 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1603 }; 1604 1605 int macvlan_link_register(struct rtnl_link_ops *ops) 1606 { 1607 /* common fields */ 1608 ops->validate = macvlan_validate; 1609 ops->maxtype = IFLA_MACVLAN_MAX; 1610 ops->policy = macvlan_policy; 1611 ops->changelink = macvlan_changelink; 1612 ops->get_size = macvlan_get_size; 1613 ops->fill_info = macvlan_fill_info; 1614 1615 return rtnl_link_register(ops); 1616 }; 1617 EXPORT_SYMBOL_GPL(macvlan_link_register); 1618 1619 static struct net *macvlan_get_link_net(const struct net_device *dev) 1620 { 1621 return dev_net(macvlan_dev_real_dev(dev)); 1622 } 1623 1624 static struct rtnl_link_ops macvlan_link_ops = { 1625 .kind = "macvlan", 1626 .setup = macvlan_setup, 1627 .newlink = macvlan_newlink, 1628 .dellink = macvlan_dellink, 1629 .get_link_net = macvlan_get_link_net, 1630 .priv_size = sizeof(struct macvlan_dev), 1631 }; 1632 1633 static int macvlan_device_event(struct notifier_block *unused, 1634 unsigned long event, void *ptr) 1635 { 1636 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1637 struct macvlan_dev *vlan, *next; 1638 struct macvlan_port *port; 1639 LIST_HEAD(list_kill); 1640 1641 if (!macvlan_port_exists(dev)) 1642 return NOTIFY_DONE; 1643 1644 port = macvlan_port_get_rtnl(dev); 1645 1646 switch (event) { 1647 case NETDEV_UP: 1648 case NETDEV_CHANGE: 1649 list_for_each_entry(vlan, &port->vlans, list) 1650 netif_stacked_transfer_operstate(vlan->lowerdev, 1651 vlan->dev); 1652 break; 1653 case NETDEV_FEAT_CHANGE: 1654 list_for_each_entry(vlan, &port->vlans, list) { 1655 vlan->dev->gso_max_size = dev->gso_max_size; 1656 vlan->dev->gso_max_segs = dev->gso_max_segs; 1657 netdev_update_features(vlan->dev); 1658 } 1659 break; 1660 case NETDEV_CHANGEMTU: 1661 list_for_each_entry(vlan, &port->vlans, list) { 1662 if (vlan->dev->mtu <= dev->mtu) 1663 continue; 1664 dev_set_mtu(vlan->dev, dev->mtu); 1665 } 1666 break; 1667 case NETDEV_CHANGEADDR: 1668 if (!macvlan_passthru(port)) 1669 return NOTIFY_DONE; 1670 1671 vlan = list_first_entry_or_null(&port->vlans, 1672 struct macvlan_dev, 1673 list); 1674 1675 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1676 return NOTIFY_BAD; 1677 1678 break; 1679 case NETDEV_UNREGISTER: 1680 /* twiddle thumbs on netns device moves */ 1681 if (dev->reg_state != NETREG_UNREGISTERING) 1682 break; 1683 1684 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1685 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1686 unregister_netdevice_many(&list_kill); 1687 break; 1688 case NETDEV_PRE_TYPE_CHANGE: 1689 /* Forbid underlaying device to change its type. */ 1690 return NOTIFY_BAD; 1691 1692 case NETDEV_NOTIFY_PEERS: 1693 case NETDEV_BONDING_FAILOVER: 1694 case NETDEV_RESEND_IGMP: 1695 /* Propagate to all vlans */ 1696 list_for_each_entry(vlan, &port->vlans, list) 1697 call_netdevice_notifiers(event, vlan->dev); 1698 } 1699 return NOTIFY_DONE; 1700 } 1701 1702 static struct notifier_block macvlan_notifier_block __read_mostly = { 1703 .notifier_call = macvlan_device_event, 1704 }; 1705 1706 static int __init macvlan_init_module(void) 1707 { 1708 int err; 1709 1710 register_netdevice_notifier(&macvlan_notifier_block); 1711 1712 err = macvlan_link_register(&macvlan_link_ops); 1713 if (err < 0) 1714 goto err1; 1715 return 0; 1716 err1: 1717 unregister_netdevice_notifier(&macvlan_notifier_block); 1718 return err; 1719 } 1720 1721 static void __exit macvlan_cleanup_module(void) 1722 { 1723 rtnl_link_unregister(&macvlan_link_ops); 1724 unregister_netdevice_notifier(&macvlan_notifier_block); 1725 } 1726 1727 module_init(macvlan_init_module); 1728 module_exit(macvlan_cleanup_module); 1729 1730 MODULE_LICENSE("GPL"); 1731 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1732 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1733 MODULE_ALIAS_RTNL_LINK("macvlan"); 1734