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 xmit_world: 536 skb->dev = vlan->lowerdev; 537 return dev_queue_xmit_accel(skb, 538 netdev_get_sb_channel(dev) ? dev : NULL); 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 struct macvlan_dev *vlan = netdev_priv(dev); 556 unsigned int len = skb->len; 557 int ret; 558 559 if (unlikely(netpoll_tx_running(dev))) 560 return macvlan_netpoll_send_skb(vlan, skb); 561 562 ret = macvlan_queue_xmit(skb, dev); 563 564 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 565 struct vlan_pcpu_stats *pcpu_stats; 566 567 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 568 u64_stats_update_begin(&pcpu_stats->syncp); 569 pcpu_stats->tx_packets++; 570 pcpu_stats->tx_bytes += len; 571 u64_stats_update_end(&pcpu_stats->syncp); 572 } else { 573 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 574 } 575 return ret; 576 } 577 578 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 579 unsigned short type, const void *daddr, 580 const void *saddr, unsigned len) 581 { 582 const struct macvlan_dev *vlan = netdev_priv(dev); 583 struct net_device *lowerdev = vlan->lowerdev; 584 585 return dev_hard_header(skb, lowerdev, type, daddr, 586 saddr ? : dev->dev_addr, len); 587 } 588 589 static const struct header_ops macvlan_hard_header_ops = { 590 .create = macvlan_hard_header, 591 .parse = eth_header_parse, 592 .cache = eth_header_cache, 593 .cache_update = eth_header_cache_update, 594 }; 595 596 static int macvlan_open(struct net_device *dev) 597 { 598 struct macvlan_dev *vlan = netdev_priv(dev); 599 struct net_device *lowerdev = vlan->lowerdev; 600 int err; 601 602 if (macvlan_passthru(vlan->port)) { 603 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 604 err = dev_set_promiscuity(lowerdev, 1); 605 if (err < 0) 606 goto out; 607 } 608 goto hash_add; 609 } 610 611 err = -EBUSY; 612 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 613 goto out; 614 615 /* Attempt to populate accel_priv which is used to offload the L2 616 * forwarding requests for unicast packets. 617 */ 618 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) 619 vlan->accel_priv = 620 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 621 622 /* If earlier attempt to offload failed, or accel_priv is not 623 * populated we must add the unicast address to the lower device. 624 */ 625 if (IS_ERR_OR_NULL(vlan->accel_priv)) { 626 vlan->accel_priv = NULL; 627 err = dev_uc_add(lowerdev, dev->dev_addr); 628 if (err < 0) 629 goto out; 630 } 631 632 if (dev->flags & IFF_ALLMULTI) { 633 err = dev_set_allmulti(lowerdev, 1); 634 if (err < 0) 635 goto del_unicast; 636 } 637 638 if (dev->flags & IFF_PROMISC) { 639 err = dev_set_promiscuity(lowerdev, 1); 640 if (err < 0) 641 goto clear_multi; 642 } 643 644 hash_add: 645 macvlan_hash_add(vlan); 646 return 0; 647 648 clear_multi: 649 if (dev->flags & IFF_ALLMULTI) 650 dev_set_allmulti(lowerdev, -1); 651 del_unicast: 652 if (vlan->accel_priv) { 653 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 654 vlan->accel_priv); 655 vlan->accel_priv = NULL; 656 } else { 657 dev_uc_del(lowerdev, dev->dev_addr); 658 } 659 out: 660 return err; 661 } 662 663 static int macvlan_stop(struct net_device *dev) 664 { 665 struct macvlan_dev *vlan = netdev_priv(dev); 666 struct net_device *lowerdev = vlan->lowerdev; 667 668 if (vlan->accel_priv) { 669 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 670 vlan->accel_priv); 671 vlan->accel_priv = NULL; 672 } 673 674 dev_uc_unsync(lowerdev, dev); 675 dev_mc_unsync(lowerdev, dev); 676 677 if (macvlan_passthru(vlan->port)) { 678 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 679 dev_set_promiscuity(lowerdev, -1); 680 goto hash_del; 681 } 682 683 if (dev->flags & IFF_ALLMULTI) 684 dev_set_allmulti(lowerdev, -1); 685 686 if (dev->flags & IFF_PROMISC) 687 dev_set_promiscuity(lowerdev, -1); 688 689 dev_uc_del(lowerdev, dev->dev_addr); 690 691 hash_del: 692 macvlan_hash_del(vlan, !dev->dismantle); 693 return 0; 694 } 695 696 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 697 { 698 struct macvlan_dev *vlan = netdev_priv(dev); 699 struct net_device *lowerdev = vlan->lowerdev; 700 struct macvlan_port *port = vlan->port; 701 int err; 702 703 if (!(dev->flags & IFF_UP)) { 704 /* Just copy in the new address */ 705 ether_addr_copy(dev->dev_addr, addr); 706 } else { 707 /* Rehash and update the device filters */ 708 if (macvlan_addr_busy(vlan->port, addr)) 709 return -EBUSY; 710 711 if (!macvlan_passthru(port)) { 712 err = dev_uc_add(lowerdev, addr); 713 if (err) 714 return err; 715 716 dev_uc_del(lowerdev, dev->dev_addr); 717 } 718 719 macvlan_hash_change_addr(vlan, addr); 720 } 721 if (macvlan_passthru(port) && !macvlan_addr_change(port)) { 722 /* Since addr_change isn't set, we are here due to lower 723 * device change. Save the lower-dev address so we can 724 * restore it later. 725 */ 726 ether_addr_copy(vlan->port->perm_addr, 727 lowerdev->dev_addr); 728 } 729 macvlan_clear_addr_change(port); 730 return 0; 731 } 732 733 static int macvlan_set_mac_address(struct net_device *dev, void *p) 734 { 735 struct macvlan_dev *vlan = netdev_priv(dev); 736 struct sockaddr *addr = p; 737 738 if (!is_valid_ether_addr(addr->sa_data)) 739 return -EADDRNOTAVAIL; 740 741 /* If the addresses are the same, this is a no-op */ 742 if (ether_addr_equal(dev->dev_addr, addr->sa_data)) 743 return 0; 744 745 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 746 macvlan_set_addr_change(vlan->port); 747 return dev_set_mac_address(vlan->lowerdev, addr); 748 } 749 750 return macvlan_sync_address(dev, addr->sa_data); 751 } 752 753 static void macvlan_change_rx_flags(struct net_device *dev, int change) 754 { 755 struct macvlan_dev *vlan = netdev_priv(dev); 756 struct net_device *lowerdev = vlan->lowerdev; 757 758 if (dev->flags & IFF_UP) { 759 if (change & IFF_ALLMULTI) 760 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 761 if (change & IFF_PROMISC) 762 dev_set_promiscuity(lowerdev, 763 dev->flags & IFF_PROMISC ? 1 : -1); 764 765 } 766 } 767 768 static void macvlan_compute_filter(unsigned long *mc_filter, 769 struct net_device *dev, 770 struct macvlan_dev *vlan) 771 { 772 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 773 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 774 } else { 775 struct netdev_hw_addr *ha; 776 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 777 778 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 779 netdev_for_each_mc_addr(ha, dev) { 780 __set_bit(mc_hash(vlan, ha->addr), filter); 781 } 782 783 __set_bit(mc_hash(vlan, dev->broadcast), filter); 784 785 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 786 } 787 } 788 789 static void macvlan_set_mac_lists(struct net_device *dev) 790 { 791 struct macvlan_dev *vlan = netdev_priv(dev); 792 793 macvlan_compute_filter(vlan->mc_filter, dev, vlan); 794 795 dev_uc_sync(vlan->lowerdev, dev); 796 dev_mc_sync(vlan->lowerdev, dev); 797 798 /* This is slightly inaccurate as we're including the subscription 799 * list of vlan->lowerdev too. 800 * 801 * Bug alert: This only works if everyone has the same broadcast 802 * address as lowerdev. As soon as someone changes theirs this 803 * will break. 804 * 805 * However, this is already broken as when you change your broadcast 806 * address we don't get called. 807 * 808 * The solution is to maintain a list of broadcast addresses like 809 * we do for uc/mc, if you care. 810 */ 811 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); 812 } 813 814 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 815 { 816 struct macvlan_dev *vlan = netdev_priv(dev); 817 818 if (vlan->lowerdev->mtu < new_mtu) 819 return -EINVAL; 820 dev->mtu = new_mtu; 821 return 0; 822 } 823 824 /* 825 * macvlan network devices have devices nesting below it and are a special 826 * "super class" of normal network devices; split their locks off into a 827 * separate class since they always nest. 828 */ 829 static struct lock_class_key macvlan_netdev_addr_lock_key; 830 831 #define ALWAYS_ON_OFFLOADS \ 832 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ 833 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL) 834 835 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX) 836 837 #define MACVLAN_FEATURES \ 838 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 839 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \ 840 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 841 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 842 843 #define MACVLAN_STATE_MASK \ 844 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 845 846 static int macvlan_get_nest_level(struct net_device *dev) 847 { 848 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 849 } 850 851 static void macvlan_set_lockdep_class(struct net_device *dev) 852 { 853 netdev_lockdep_set_classes(dev); 854 lockdep_set_class_and_subclass(&dev->addr_list_lock, 855 &macvlan_netdev_addr_lock_key, 856 macvlan_get_nest_level(dev)); 857 } 858 859 static int macvlan_init(struct net_device *dev) 860 { 861 struct macvlan_dev *vlan = netdev_priv(dev); 862 const struct net_device *lowerdev = vlan->lowerdev; 863 struct macvlan_port *port = vlan->port; 864 865 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 866 (lowerdev->state & MACVLAN_STATE_MASK); 867 dev->features = lowerdev->features & MACVLAN_FEATURES; 868 dev->features |= ALWAYS_ON_FEATURES; 869 dev->hw_features |= NETIF_F_LRO; 870 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 871 dev->vlan_features |= ALWAYS_ON_OFFLOADS; 872 dev->hw_enc_features |= dev->features; 873 dev->gso_max_size = lowerdev->gso_max_size; 874 dev->gso_max_segs = lowerdev->gso_max_segs; 875 dev->hard_header_len = lowerdev->hard_header_len; 876 877 macvlan_set_lockdep_class(dev); 878 879 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 880 if (!vlan->pcpu_stats) 881 return -ENOMEM; 882 883 port->count += 1; 884 885 return 0; 886 } 887 888 static void macvlan_uninit(struct net_device *dev) 889 { 890 struct macvlan_dev *vlan = netdev_priv(dev); 891 struct macvlan_port *port = vlan->port; 892 893 free_percpu(vlan->pcpu_stats); 894 895 macvlan_flush_sources(port, vlan); 896 port->count -= 1; 897 if (!port->count) 898 macvlan_port_destroy(port->dev); 899 } 900 901 static void macvlan_dev_get_stats64(struct net_device *dev, 902 struct rtnl_link_stats64 *stats) 903 { 904 struct macvlan_dev *vlan = netdev_priv(dev); 905 906 if (vlan->pcpu_stats) { 907 struct vlan_pcpu_stats *p; 908 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 909 u32 rx_errors = 0, tx_dropped = 0; 910 unsigned int start; 911 int i; 912 913 for_each_possible_cpu(i) { 914 p = per_cpu_ptr(vlan->pcpu_stats, i); 915 do { 916 start = u64_stats_fetch_begin_irq(&p->syncp); 917 rx_packets = p->rx_packets; 918 rx_bytes = p->rx_bytes; 919 rx_multicast = p->rx_multicast; 920 tx_packets = p->tx_packets; 921 tx_bytes = p->tx_bytes; 922 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 923 924 stats->rx_packets += rx_packets; 925 stats->rx_bytes += rx_bytes; 926 stats->multicast += rx_multicast; 927 stats->tx_packets += tx_packets; 928 stats->tx_bytes += tx_bytes; 929 /* rx_errors & tx_dropped are u32, updated 930 * without syncp protection. 931 */ 932 rx_errors += p->rx_errors; 933 tx_dropped += p->tx_dropped; 934 } 935 stats->rx_errors = rx_errors; 936 stats->rx_dropped = rx_errors; 937 stats->tx_dropped = tx_dropped; 938 } 939 } 940 941 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 942 __be16 proto, u16 vid) 943 { 944 struct macvlan_dev *vlan = netdev_priv(dev); 945 struct net_device *lowerdev = vlan->lowerdev; 946 947 return vlan_vid_add(lowerdev, proto, vid); 948 } 949 950 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 951 __be16 proto, u16 vid) 952 { 953 struct macvlan_dev *vlan = netdev_priv(dev); 954 struct net_device *lowerdev = vlan->lowerdev; 955 956 vlan_vid_del(lowerdev, proto, vid); 957 return 0; 958 } 959 960 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 961 struct net_device *dev, 962 const unsigned char *addr, u16 vid, 963 u16 flags) 964 { 965 struct macvlan_dev *vlan = netdev_priv(dev); 966 int err = -EINVAL; 967 968 /* Support unicast filter only on passthru devices. 969 * Multicast filter should be allowed on all devices. 970 */ 971 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 972 return -EOPNOTSUPP; 973 974 if (flags & NLM_F_REPLACE) 975 return -EOPNOTSUPP; 976 977 if (is_unicast_ether_addr(addr)) 978 err = dev_uc_add_excl(dev, addr); 979 else if (is_multicast_ether_addr(addr)) 980 err = dev_mc_add_excl(dev, addr); 981 982 return err; 983 } 984 985 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 986 struct net_device *dev, 987 const unsigned char *addr, u16 vid) 988 { 989 struct macvlan_dev *vlan = netdev_priv(dev); 990 int err = -EINVAL; 991 992 /* Support unicast filter only on passthru devices. 993 * Multicast filter should be allowed on all devices. 994 */ 995 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 996 return -EOPNOTSUPP; 997 998 if (is_unicast_ether_addr(addr)) 999 err = dev_uc_del(dev, addr); 1000 else if (is_multicast_ether_addr(addr)) 1001 err = dev_mc_del(dev, addr); 1002 1003 return err; 1004 } 1005 1006 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 1007 struct ethtool_drvinfo *drvinfo) 1008 { 1009 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 1010 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 1011 } 1012 1013 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 1014 struct ethtool_link_ksettings *cmd) 1015 { 1016 const struct macvlan_dev *vlan = netdev_priv(dev); 1017 1018 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 1019 } 1020 1021 static netdev_features_t macvlan_fix_features(struct net_device *dev, 1022 netdev_features_t features) 1023 { 1024 struct macvlan_dev *vlan = netdev_priv(dev); 1025 netdev_features_t lowerdev_features = vlan->lowerdev->features; 1026 netdev_features_t mask; 1027 1028 features |= NETIF_F_ALL_FOR_ALL; 1029 features &= (vlan->set_features | ~MACVLAN_FEATURES); 1030 mask = features; 1031 1032 lowerdev_features &= (features | ~NETIF_F_LRO); 1033 features = netdev_increment_features(lowerdev_features, features, mask); 1034 features |= ALWAYS_ON_FEATURES; 1035 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES); 1036 1037 return features; 1038 } 1039 1040 #ifdef CONFIG_NET_POLL_CONTROLLER 1041 static void macvlan_dev_poll_controller(struct net_device *dev) 1042 { 1043 return; 1044 } 1045 1046 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 1047 { 1048 struct macvlan_dev *vlan = netdev_priv(dev); 1049 struct net_device *real_dev = vlan->lowerdev; 1050 struct netpoll *netpoll; 1051 int err = 0; 1052 1053 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 1054 err = -ENOMEM; 1055 if (!netpoll) 1056 goto out; 1057 1058 err = __netpoll_setup(netpoll, real_dev); 1059 if (err) { 1060 kfree(netpoll); 1061 goto out; 1062 } 1063 1064 vlan->netpoll = netpoll; 1065 1066 out: 1067 return err; 1068 } 1069 1070 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1071 { 1072 struct macvlan_dev *vlan = netdev_priv(dev); 1073 struct netpoll *netpoll = vlan->netpoll; 1074 1075 if (!netpoll) 1076 return; 1077 1078 vlan->netpoll = NULL; 1079 1080 __netpoll_free(netpoll); 1081 } 1082 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1083 1084 static int macvlan_dev_get_iflink(const struct net_device *dev) 1085 { 1086 struct macvlan_dev *vlan = netdev_priv(dev); 1087 1088 return vlan->lowerdev->ifindex; 1089 } 1090 1091 static const struct ethtool_ops macvlan_ethtool_ops = { 1092 .get_link = ethtool_op_get_link, 1093 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1094 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1095 }; 1096 1097 static const struct net_device_ops macvlan_netdev_ops = { 1098 .ndo_init = macvlan_init, 1099 .ndo_uninit = macvlan_uninit, 1100 .ndo_open = macvlan_open, 1101 .ndo_stop = macvlan_stop, 1102 .ndo_start_xmit = macvlan_start_xmit, 1103 .ndo_change_mtu = macvlan_change_mtu, 1104 .ndo_fix_features = macvlan_fix_features, 1105 .ndo_change_rx_flags = macvlan_change_rx_flags, 1106 .ndo_set_mac_address = macvlan_set_mac_address, 1107 .ndo_set_rx_mode = macvlan_set_mac_lists, 1108 .ndo_get_stats64 = macvlan_dev_get_stats64, 1109 .ndo_validate_addr = eth_validate_addr, 1110 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1111 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1112 .ndo_fdb_add = macvlan_fdb_add, 1113 .ndo_fdb_del = macvlan_fdb_del, 1114 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1115 .ndo_get_lock_subclass = macvlan_get_nest_level, 1116 #ifdef CONFIG_NET_POLL_CONTROLLER 1117 .ndo_poll_controller = macvlan_dev_poll_controller, 1118 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1119 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1120 #endif 1121 .ndo_get_iflink = macvlan_dev_get_iflink, 1122 .ndo_features_check = passthru_features_check, 1123 }; 1124 1125 void macvlan_common_setup(struct net_device *dev) 1126 { 1127 ether_setup(dev); 1128 1129 dev->min_mtu = 0; 1130 dev->max_mtu = ETH_MAX_MTU; 1131 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1132 netif_keep_dst(dev); 1133 dev->priv_flags |= IFF_UNICAST_FLT; 1134 dev->netdev_ops = &macvlan_netdev_ops; 1135 dev->needs_free_netdev = true; 1136 dev->header_ops = &macvlan_hard_header_ops; 1137 dev->ethtool_ops = &macvlan_ethtool_ops; 1138 } 1139 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1140 1141 static void macvlan_setup(struct net_device *dev) 1142 { 1143 macvlan_common_setup(dev); 1144 dev->priv_flags |= IFF_NO_QUEUE; 1145 } 1146 1147 static int macvlan_port_create(struct net_device *dev) 1148 { 1149 struct macvlan_port *port; 1150 unsigned int i; 1151 int err; 1152 1153 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1154 return -EINVAL; 1155 1156 if (netdev_is_rx_handler_busy(dev)) 1157 return -EBUSY; 1158 1159 port = kzalloc(sizeof(*port), GFP_KERNEL); 1160 if (port == NULL) 1161 return -ENOMEM; 1162 1163 port->dev = dev; 1164 ether_addr_copy(port->perm_addr, dev->dev_addr); 1165 INIT_LIST_HEAD(&port->vlans); 1166 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1167 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1168 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1169 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1170 1171 skb_queue_head_init(&port->bc_queue); 1172 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1173 1174 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1175 if (err) 1176 kfree(port); 1177 else 1178 dev->priv_flags |= IFF_MACVLAN_PORT; 1179 return err; 1180 } 1181 1182 static void macvlan_port_destroy(struct net_device *dev) 1183 { 1184 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1185 struct sk_buff *skb; 1186 1187 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1188 netdev_rx_handler_unregister(dev); 1189 1190 /* After this point, no packet can schedule bc_work anymore, 1191 * but we need to cancel it and purge left skbs if any. 1192 */ 1193 cancel_work_sync(&port->bc_work); 1194 1195 while ((skb = __skb_dequeue(&port->bc_queue))) { 1196 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 1197 1198 if (src) 1199 dev_put(src->dev); 1200 1201 kfree_skb(skb); 1202 } 1203 1204 /* If the lower device address has been changed by passthru 1205 * macvlan, put it back. 1206 */ 1207 if (macvlan_passthru(port) && 1208 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { 1209 struct sockaddr sa; 1210 1211 sa.sa_family = port->dev->type; 1212 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len); 1213 dev_set_mac_address(port->dev, &sa); 1214 } 1215 1216 kfree(port); 1217 } 1218 1219 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[], 1220 struct netlink_ext_ack *extack) 1221 { 1222 if (tb[IFLA_ADDRESS]) { 1223 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1224 return -EINVAL; 1225 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1226 return -EADDRNOTAVAIL; 1227 } 1228 1229 if (!data) 1230 return 0; 1231 1232 if (data[IFLA_MACVLAN_FLAGS] && 1233 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1234 return -EINVAL; 1235 1236 if (data[IFLA_MACVLAN_MODE]) { 1237 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1238 case MACVLAN_MODE_PRIVATE: 1239 case MACVLAN_MODE_VEPA: 1240 case MACVLAN_MODE_BRIDGE: 1241 case MACVLAN_MODE_PASSTHRU: 1242 case MACVLAN_MODE_SOURCE: 1243 break; 1244 default: 1245 return -EINVAL; 1246 } 1247 } 1248 1249 if (data[IFLA_MACVLAN_MACADDR_MODE]) { 1250 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1251 case MACVLAN_MACADDR_ADD: 1252 case MACVLAN_MACADDR_DEL: 1253 case MACVLAN_MACADDR_FLUSH: 1254 case MACVLAN_MACADDR_SET: 1255 break; 1256 default: 1257 return -EINVAL; 1258 } 1259 } 1260 1261 if (data[IFLA_MACVLAN_MACADDR]) { 1262 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1263 return -EINVAL; 1264 1265 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1266 return -EADDRNOTAVAIL; 1267 } 1268 1269 if (data[IFLA_MACVLAN_MACADDR_COUNT]) 1270 return -EINVAL; 1271 1272 return 0; 1273 } 1274 1275 /** 1276 * reconfigure list of remote source mac address 1277 * (only for macvlan devices in source mode) 1278 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1279 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1280 */ 1281 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1282 struct nlattr *data[]) 1283 { 1284 char *addr = NULL; 1285 int ret, rem, len; 1286 struct nlattr *nla, *head; 1287 struct macvlan_source_entry *entry; 1288 1289 if (data[IFLA_MACVLAN_MACADDR]) 1290 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1291 1292 if (mode == MACVLAN_MACADDR_ADD) { 1293 if (!addr) 1294 return -EINVAL; 1295 1296 return macvlan_hash_add_source(vlan, addr); 1297 1298 } else if (mode == MACVLAN_MACADDR_DEL) { 1299 if (!addr) 1300 return -EINVAL; 1301 1302 entry = macvlan_hash_lookup_source(vlan, addr); 1303 if (entry) { 1304 macvlan_hash_del_source(entry); 1305 vlan->macaddr_count--; 1306 } 1307 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1308 macvlan_flush_sources(vlan->port, vlan); 1309 } else if (mode == MACVLAN_MACADDR_SET) { 1310 macvlan_flush_sources(vlan->port, vlan); 1311 1312 if (addr) { 1313 ret = macvlan_hash_add_source(vlan, addr); 1314 if (ret) 1315 return ret; 1316 } 1317 1318 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1319 return 0; 1320 1321 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1322 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1323 1324 nla_for_each_attr(nla, head, len, rem) { 1325 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1326 nla_len(nla) != ETH_ALEN) 1327 continue; 1328 1329 addr = nla_data(nla); 1330 ret = macvlan_hash_add_source(vlan, addr); 1331 if (ret) 1332 return ret; 1333 } 1334 } else { 1335 return -EINVAL; 1336 } 1337 1338 return 0; 1339 } 1340 1341 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1342 struct nlattr *tb[], struct nlattr *data[], 1343 struct netlink_ext_ack *extack) 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, extack); 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 /* macvlan_uninit would free the macvlan port */ 1444 unregister_netdevice(dev); 1445 return err; 1446 destroy_macvlan_port: 1447 /* the macvlan port may be freed by macvlan_uninit when fail to register. 1448 * so we destroy the macvlan port only when it's valid. 1449 */ 1450 if (create && macvlan_port_get_rtnl(lowerdev)) 1451 macvlan_port_destroy(port->dev); 1452 return err; 1453 } 1454 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1455 1456 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1457 struct nlattr *tb[], struct nlattr *data[], 1458 struct netlink_ext_ack *extack) 1459 { 1460 return macvlan_common_newlink(src_net, dev, tb, data, extack); 1461 } 1462 1463 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1464 { 1465 struct macvlan_dev *vlan = netdev_priv(dev); 1466 1467 if (vlan->mode == MACVLAN_MODE_SOURCE) 1468 macvlan_flush_sources(vlan->port, vlan); 1469 list_del_rcu(&vlan->list); 1470 unregister_netdevice_queue(dev, head); 1471 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1472 } 1473 EXPORT_SYMBOL_GPL(macvlan_dellink); 1474 1475 static int macvlan_changelink(struct net_device *dev, 1476 struct nlattr *tb[], struct nlattr *data[], 1477 struct netlink_ext_ack *extack) 1478 { 1479 struct macvlan_dev *vlan = netdev_priv(dev); 1480 enum macvlan_mode mode; 1481 bool set_mode = false; 1482 enum macvlan_macaddr_mode macmode; 1483 int ret; 1484 1485 /* Validate mode, but don't set yet: setting flags may fail. */ 1486 if (data && data[IFLA_MACVLAN_MODE]) { 1487 set_mode = true; 1488 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1489 /* Passthrough mode can't be set or cleared dynamically */ 1490 if ((mode == MACVLAN_MODE_PASSTHRU) != 1491 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1492 return -EINVAL; 1493 if (vlan->mode == MACVLAN_MODE_SOURCE && 1494 vlan->mode != mode) 1495 macvlan_flush_sources(vlan->port, vlan); 1496 } 1497 1498 if (data && data[IFLA_MACVLAN_FLAGS]) { 1499 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1500 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1501 if (macvlan_passthru(vlan->port) && promisc) { 1502 int err; 1503 1504 if (flags & MACVLAN_FLAG_NOPROMISC) 1505 err = dev_set_promiscuity(vlan->lowerdev, -1); 1506 else 1507 err = dev_set_promiscuity(vlan->lowerdev, 1); 1508 if (err < 0) 1509 return err; 1510 } 1511 vlan->flags = flags; 1512 } 1513 if (set_mode) 1514 vlan->mode = mode; 1515 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1516 if (vlan->mode != MACVLAN_MODE_SOURCE) 1517 return -EINVAL; 1518 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1519 ret = macvlan_changelink_sources(vlan, macmode, data); 1520 if (ret) 1521 return ret; 1522 } 1523 return 0; 1524 } 1525 1526 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1527 { 1528 if (vlan->macaddr_count == 0) 1529 return 0; 1530 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1531 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1532 } 1533 1534 static size_t macvlan_get_size(const struct net_device *dev) 1535 { 1536 struct macvlan_dev *vlan = netdev_priv(dev); 1537 1538 return (0 1539 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1540 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1541 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1542 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1543 ); 1544 } 1545 1546 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1547 const struct macvlan_dev *vlan, 1548 const int i) 1549 { 1550 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1551 struct macvlan_source_entry *entry; 1552 1553 hlist_for_each_entry_rcu(entry, h, hlist) { 1554 if (entry->vlan != vlan) 1555 continue; 1556 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1557 return 1; 1558 } 1559 return 0; 1560 } 1561 1562 static int macvlan_fill_info(struct sk_buff *skb, 1563 const struct net_device *dev) 1564 { 1565 struct macvlan_dev *vlan = netdev_priv(dev); 1566 int i; 1567 struct nlattr *nest; 1568 1569 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1570 goto nla_put_failure; 1571 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1572 goto nla_put_failure; 1573 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1574 goto nla_put_failure; 1575 if (vlan->macaddr_count > 0) { 1576 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1577 if (nest == NULL) 1578 goto nla_put_failure; 1579 1580 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1581 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1582 goto nla_put_failure; 1583 } 1584 nla_nest_end(skb, nest); 1585 } 1586 return 0; 1587 1588 nla_put_failure: 1589 return -EMSGSIZE; 1590 } 1591 1592 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1593 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1594 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1595 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1596 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1597 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1598 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1599 }; 1600 1601 int macvlan_link_register(struct rtnl_link_ops *ops) 1602 { 1603 /* common fields */ 1604 ops->validate = macvlan_validate; 1605 ops->maxtype = IFLA_MACVLAN_MAX; 1606 ops->policy = macvlan_policy; 1607 ops->changelink = macvlan_changelink; 1608 ops->get_size = macvlan_get_size; 1609 ops->fill_info = macvlan_fill_info; 1610 1611 return rtnl_link_register(ops); 1612 }; 1613 EXPORT_SYMBOL_GPL(macvlan_link_register); 1614 1615 static struct net *macvlan_get_link_net(const struct net_device *dev) 1616 { 1617 return dev_net(macvlan_dev_real_dev(dev)); 1618 } 1619 1620 static struct rtnl_link_ops macvlan_link_ops = { 1621 .kind = "macvlan", 1622 .setup = macvlan_setup, 1623 .newlink = macvlan_newlink, 1624 .dellink = macvlan_dellink, 1625 .get_link_net = macvlan_get_link_net, 1626 .priv_size = sizeof(struct macvlan_dev), 1627 }; 1628 1629 static int macvlan_device_event(struct notifier_block *unused, 1630 unsigned long event, void *ptr) 1631 { 1632 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1633 struct macvlan_dev *vlan, *next; 1634 struct macvlan_port *port; 1635 LIST_HEAD(list_kill); 1636 1637 if (!macvlan_port_exists(dev)) 1638 return NOTIFY_DONE; 1639 1640 port = macvlan_port_get_rtnl(dev); 1641 1642 switch (event) { 1643 case NETDEV_UP: 1644 case NETDEV_DOWN: 1645 case NETDEV_CHANGE: 1646 list_for_each_entry(vlan, &port->vlans, list) 1647 netif_stacked_transfer_operstate(vlan->lowerdev, 1648 vlan->dev); 1649 break; 1650 case NETDEV_FEAT_CHANGE: 1651 list_for_each_entry(vlan, &port->vlans, list) { 1652 vlan->dev->gso_max_size = dev->gso_max_size; 1653 vlan->dev->gso_max_segs = dev->gso_max_segs; 1654 netdev_update_features(vlan->dev); 1655 } 1656 break; 1657 case NETDEV_CHANGEMTU: 1658 list_for_each_entry(vlan, &port->vlans, list) { 1659 if (vlan->dev->mtu <= dev->mtu) 1660 continue; 1661 dev_set_mtu(vlan->dev, dev->mtu); 1662 } 1663 break; 1664 case NETDEV_CHANGEADDR: 1665 if (!macvlan_passthru(port)) 1666 return NOTIFY_DONE; 1667 1668 vlan = list_first_entry_or_null(&port->vlans, 1669 struct macvlan_dev, 1670 list); 1671 1672 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1673 return NOTIFY_BAD; 1674 1675 break; 1676 case NETDEV_UNREGISTER: 1677 /* twiddle thumbs on netns device moves */ 1678 if (dev->reg_state != NETREG_UNREGISTERING) 1679 break; 1680 1681 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1682 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1683 unregister_netdevice_many(&list_kill); 1684 break; 1685 case NETDEV_PRE_TYPE_CHANGE: 1686 /* Forbid underlaying device to change its type. */ 1687 return NOTIFY_BAD; 1688 1689 case NETDEV_NOTIFY_PEERS: 1690 case NETDEV_BONDING_FAILOVER: 1691 case NETDEV_RESEND_IGMP: 1692 /* Propagate to all vlans */ 1693 list_for_each_entry(vlan, &port->vlans, list) 1694 call_netdevice_notifiers(event, vlan->dev); 1695 } 1696 return NOTIFY_DONE; 1697 } 1698 1699 static struct notifier_block macvlan_notifier_block __read_mostly = { 1700 .notifier_call = macvlan_device_event, 1701 }; 1702 1703 static int __init macvlan_init_module(void) 1704 { 1705 int err; 1706 1707 register_netdevice_notifier(&macvlan_notifier_block); 1708 1709 err = macvlan_link_register(&macvlan_link_ops); 1710 if (err < 0) 1711 goto err1; 1712 return 0; 1713 err1: 1714 unregister_netdevice_notifier(&macvlan_notifier_block); 1715 return err; 1716 } 1717 1718 static void __exit macvlan_cleanup_module(void) 1719 { 1720 rtnl_link_unregister(&macvlan_link_ops); 1721 unregister_netdevice_notifier(&macvlan_notifier_block); 1722 } 1723 1724 module_init(macvlan_init_module); 1725 module_exit(macvlan_cleanup_module); 1726 1727 MODULE_LICENSE("GPL"); 1728 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1729 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1730 MODULE_ALIAS_RTNL_LINK("macvlan"); 1731