1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> 4 * 5 * The code this is based on carried the following copyright notice: 6 * --- 7 * (C) Copyright 2001-2006 8 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com 9 * Re-worked by Ben Greear <greearb@candelatech.com> 10 * --- 11 */ 12 #include <linux/kernel.h> 13 #include <linux/types.h> 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/errno.h> 17 #include <linux/slab.h> 18 #include <linux/string.h> 19 #include <linux/rculist.h> 20 #include <linux/notifier.h> 21 #include <linux/netdevice.h> 22 #include <linux/etherdevice.h> 23 #include <linux/net_tstamp.h> 24 #include <linux/ethtool.h> 25 #include <linux/if_arp.h> 26 #include <linux/if_vlan.h> 27 #include <linux/if_link.h> 28 #include <linux/if_macvlan.h> 29 #include <linux/hash.h> 30 #include <linux/workqueue.h> 31 #include <net/rtnetlink.h> 32 #include <net/xfrm.h> 33 #include <linux/netpoll.h> 34 #include <linux/phy.h> 35 36 #define MACVLAN_HASH_BITS 8 37 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS) 38 #define MACVLAN_DEFAULT_BC_QUEUE_LEN 1000 39 40 #define MACVLAN_F_PASSTHRU 1 41 #define MACVLAN_F_ADDRCHANGE 2 42 43 struct macvlan_port { 44 struct net_device *dev; 45 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 46 struct list_head vlans; 47 struct sk_buff_head bc_queue; 48 struct work_struct bc_work; 49 u32 bc_queue_len_used; 50 u32 flags; 51 int count; 52 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE]; 53 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ); 54 unsigned char perm_addr[ETH_ALEN]; 55 }; 56 57 struct macvlan_source_entry { 58 struct hlist_node hlist; 59 struct macvlan_dev *vlan; 60 unsigned char addr[6+2] __aligned(sizeof(u16)); 61 struct rcu_head rcu; 62 }; 63 64 struct macvlan_skb_cb { 65 const struct macvlan_dev *src; 66 }; 67 68 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 69 70 static void macvlan_port_destroy(struct net_device *dev); 71 static void update_port_bc_queue_len(struct macvlan_port *port); 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 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 123 const unsigned char *addr) 124 { 125 struct macvlan_dev *vlan; 126 u32 idx = macvlan_eth_hash(addr); 127 128 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist, 129 lockdep_rtnl_is_held()) { 130 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 131 return vlan; 132 } 133 return NULL; 134 } 135 136 static struct macvlan_source_entry *macvlan_hash_lookup_source( 137 const struct macvlan_dev *vlan, 138 const unsigned char *addr) 139 { 140 struct macvlan_source_entry *entry; 141 u32 idx = macvlan_eth_hash(addr); 142 struct hlist_head *h = &vlan->port->vlan_source_hash[idx]; 143 144 hlist_for_each_entry_rcu(entry, h, hlist) { 145 if (ether_addr_equal_64bits(entry->addr, addr) && 146 entry->vlan == vlan) 147 return entry; 148 } 149 return NULL; 150 } 151 152 static int macvlan_hash_add_source(struct macvlan_dev *vlan, 153 const unsigned char *addr) 154 { 155 struct macvlan_port *port = vlan->port; 156 struct macvlan_source_entry *entry; 157 struct hlist_head *h; 158 159 entry = macvlan_hash_lookup_source(vlan, addr); 160 if (entry) 161 return 0; 162 163 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 164 if (!entry) 165 return -ENOMEM; 166 167 ether_addr_copy(entry->addr, addr); 168 entry->vlan = vlan; 169 h = &port->vlan_source_hash[macvlan_eth_hash(addr)]; 170 hlist_add_head_rcu(&entry->hlist, h); 171 vlan->macaddr_count++; 172 173 return 0; 174 } 175 176 static void macvlan_hash_add(struct macvlan_dev *vlan) 177 { 178 struct macvlan_port *port = vlan->port; 179 const unsigned char *addr = vlan->dev->dev_addr; 180 u32 idx = macvlan_eth_hash(addr); 181 182 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]); 183 } 184 185 static void macvlan_hash_del_source(struct macvlan_source_entry *entry) 186 { 187 hlist_del_rcu(&entry->hlist); 188 kfree_rcu(entry, rcu); 189 } 190 191 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 192 { 193 hlist_del_rcu(&vlan->hlist); 194 if (sync) 195 synchronize_rcu(); 196 } 197 198 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 199 const unsigned char *addr) 200 { 201 macvlan_hash_del(vlan, true); 202 /* Now that we are unhashed it is safe to change the device 203 * address without confusing packet delivery. 204 */ 205 eth_hw_addr_set(vlan->dev, addr); 206 macvlan_hash_add(vlan); 207 } 208 209 static bool macvlan_addr_busy(const struct macvlan_port *port, 210 const unsigned char *addr) 211 { 212 /* Test to see if the specified address is 213 * currently in use by the underlying device or 214 * another macvlan. 215 */ 216 if (!macvlan_passthru(port) && !macvlan_addr_change(port) && 217 ether_addr_equal_64bits(port->dev->dev_addr, addr)) 218 return true; 219 220 if (macvlan_hash_lookup(port, addr)) 221 return true; 222 223 return false; 224 } 225 226 227 static int macvlan_broadcast_one(struct sk_buff *skb, 228 const struct macvlan_dev *vlan, 229 const struct ethhdr *eth, bool local) 230 { 231 struct net_device *dev = vlan->dev; 232 233 if (local) 234 return __dev_forward_skb(dev, skb); 235 236 skb->dev = dev; 237 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 238 skb->pkt_type = PACKET_BROADCAST; 239 else 240 skb->pkt_type = PACKET_MULTICAST; 241 242 return 0; 243 } 244 245 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 246 { 247 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 248 } 249 250 251 static unsigned int mc_hash(const struct macvlan_dev *vlan, 252 const unsigned char *addr) 253 { 254 u32 val = __get_unaligned_cpu32(addr + 2); 255 256 val ^= macvlan_hash_mix(vlan); 257 return hash_32(val, MACVLAN_MC_FILTER_BITS); 258 } 259 260 static void macvlan_broadcast(struct sk_buff *skb, 261 const struct macvlan_port *port, 262 struct net_device *src, 263 enum macvlan_mode mode) 264 { 265 const struct ethhdr *eth = eth_hdr(skb); 266 const struct macvlan_dev *vlan; 267 struct sk_buff *nskb; 268 unsigned int i; 269 int err; 270 unsigned int hash; 271 272 if (skb->protocol == htons(ETH_P_PAUSE)) 273 return; 274 275 hash_for_each_rcu(port->vlan_hash, i, vlan, hlist) { 276 if (vlan->dev == src || !(vlan->mode & mode)) 277 continue; 278 279 hash = mc_hash(vlan, eth->h_dest); 280 if (!test_bit(hash, vlan->mc_filter)) 281 continue; 282 283 err = NET_RX_DROP; 284 nskb = skb_clone(skb, GFP_ATOMIC); 285 if (likely(nskb)) 286 err = macvlan_broadcast_one(nskb, vlan, eth, 287 mode == MACVLAN_MODE_BRIDGE) ?: 288 netif_rx(nskb); 289 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 290 err == NET_RX_SUCCESS, true); 291 } 292 } 293 294 static void macvlan_process_broadcast(struct work_struct *w) 295 { 296 struct macvlan_port *port = container_of(w, struct macvlan_port, 297 bc_work); 298 struct sk_buff *skb; 299 struct sk_buff_head list; 300 301 __skb_queue_head_init(&list); 302 303 spin_lock_bh(&port->bc_queue.lock); 304 skb_queue_splice_tail_init(&port->bc_queue, &list); 305 spin_unlock_bh(&port->bc_queue.lock); 306 307 while ((skb = __skb_dequeue(&list))) { 308 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 309 310 rcu_read_lock(); 311 312 if (!src) 313 /* frame comes from an external address */ 314 macvlan_broadcast(skb, port, NULL, 315 MACVLAN_MODE_PRIVATE | 316 MACVLAN_MODE_VEPA | 317 MACVLAN_MODE_PASSTHRU| 318 MACVLAN_MODE_BRIDGE); 319 else if (src->mode == MACVLAN_MODE_VEPA) 320 /* flood to everyone except source */ 321 macvlan_broadcast(skb, port, src->dev, 322 MACVLAN_MODE_VEPA | 323 MACVLAN_MODE_BRIDGE); 324 else 325 /* 326 * flood only to VEPA ports, bridge ports 327 * already saw the frame on the way out. 328 */ 329 macvlan_broadcast(skb, port, src->dev, 330 MACVLAN_MODE_VEPA); 331 332 rcu_read_unlock(); 333 334 if (src) 335 dev_put(src->dev); 336 consume_skb(skb); 337 338 cond_resched(); 339 } 340 } 341 342 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 343 const struct macvlan_dev *src, 344 struct sk_buff *skb) 345 { 346 struct sk_buff *nskb; 347 int err = -ENOMEM; 348 349 nskb = skb_clone(skb, GFP_ATOMIC); 350 if (!nskb) 351 goto err; 352 353 MACVLAN_SKB_CB(nskb)->src = src; 354 355 spin_lock(&port->bc_queue.lock); 356 if (skb_queue_len(&port->bc_queue) < port->bc_queue_len_used) { 357 if (src) 358 dev_hold(src->dev); 359 __skb_queue_tail(&port->bc_queue, nskb); 360 err = 0; 361 } 362 spin_unlock(&port->bc_queue.lock); 363 364 schedule_work(&port->bc_work); 365 366 if (err) 367 goto free_nskb; 368 369 return; 370 371 free_nskb: 372 kfree_skb(nskb); 373 err: 374 dev_core_stats_rx_dropped_inc(skb->dev); 375 } 376 377 static void macvlan_flush_sources(struct macvlan_port *port, 378 struct macvlan_dev *vlan) 379 { 380 struct macvlan_source_entry *entry; 381 struct hlist_node *next; 382 int i; 383 384 hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist) 385 if (entry->vlan == vlan) 386 macvlan_hash_del_source(entry); 387 388 vlan->macaddr_count = 0; 389 } 390 391 static void macvlan_forward_source_one(struct sk_buff *skb, 392 struct macvlan_dev *vlan) 393 { 394 struct sk_buff *nskb; 395 struct net_device *dev; 396 int len; 397 int ret; 398 399 dev = vlan->dev; 400 if (unlikely(!(dev->flags & IFF_UP))) 401 return; 402 403 nskb = skb_clone(skb, GFP_ATOMIC); 404 if (!nskb) 405 return; 406 407 len = nskb->len + ETH_HLEN; 408 nskb->dev = dev; 409 410 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr)) 411 nskb->pkt_type = PACKET_HOST; 412 413 ret = __netif_rx(nskb); 414 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 415 } 416 417 static bool macvlan_forward_source(struct sk_buff *skb, 418 struct macvlan_port *port, 419 const unsigned char *addr) 420 { 421 struct macvlan_source_entry *entry; 422 u32 idx = macvlan_eth_hash(addr); 423 struct hlist_head *h = &port->vlan_source_hash[idx]; 424 bool consume = false; 425 426 hlist_for_each_entry_rcu(entry, h, hlist) { 427 if (ether_addr_equal_64bits(entry->addr, addr)) { 428 if (entry->vlan->flags & MACVLAN_FLAG_NODST) 429 consume = true; 430 macvlan_forward_source_one(skb, entry->vlan); 431 } 432 } 433 434 return consume; 435 } 436 437 /* called under rcu_read_lock() from netif_receive_skb */ 438 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 439 { 440 struct macvlan_port *port; 441 struct sk_buff *skb = *pskb; 442 const struct ethhdr *eth = eth_hdr(skb); 443 const struct macvlan_dev *vlan; 444 const struct macvlan_dev *src; 445 struct net_device *dev; 446 unsigned int len = 0; 447 int ret; 448 rx_handler_result_t handle_res; 449 450 /* Packets from dev_loopback_xmit() do not have L2 header, bail out */ 451 if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) 452 return RX_HANDLER_PASS; 453 454 port = macvlan_port_get_rcu(skb->dev); 455 if (is_multicast_ether_addr(eth->h_dest)) { 456 unsigned int hash; 457 458 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); 459 if (!skb) 460 return RX_HANDLER_CONSUMED; 461 *pskb = skb; 462 eth = eth_hdr(skb); 463 if (macvlan_forward_source(skb, port, eth->h_source)) { 464 kfree_skb(skb); 465 return RX_HANDLER_CONSUMED; 466 } 467 src = macvlan_hash_lookup(port, eth->h_source); 468 if (src && src->mode != MACVLAN_MODE_VEPA && 469 src->mode != MACVLAN_MODE_BRIDGE) { 470 /* forward to original port. */ 471 vlan = src; 472 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 473 __netif_rx(skb); 474 handle_res = RX_HANDLER_CONSUMED; 475 goto out; 476 } 477 478 hash = mc_hash(NULL, eth->h_dest); 479 if (test_bit(hash, port->mc_filter)) 480 macvlan_broadcast_enqueue(port, src, skb); 481 482 return RX_HANDLER_PASS; 483 } 484 485 if (macvlan_forward_source(skb, port, eth->h_source)) { 486 kfree_skb(skb); 487 return RX_HANDLER_CONSUMED; 488 } 489 if (macvlan_passthru(port)) 490 vlan = list_first_or_null_rcu(&port->vlans, 491 struct macvlan_dev, list); 492 else 493 vlan = macvlan_hash_lookup(port, eth->h_dest); 494 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE) 495 return RX_HANDLER_PASS; 496 497 dev = vlan->dev; 498 if (unlikely(!(dev->flags & IFF_UP))) { 499 kfree_skb(skb); 500 return RX_HANDLER_CONSUMED; 501 } 502 len = skb->len + ETH_HLEN; 503 skb = skb_share_check(skb, GFP_ATOMIC); 504 if (!skb) { 505 ret = NET_RX_DROP; 506 handle_res = RX_HANDLER_CONSUMED; 507 goto out; 508 } 509 510 *pskb = skb; 511 skb->dev = dev; 512 skb->pkt_type = PACKET_HOST; 513 514 ret = NET_RX_SUCCESS; 515 handle_res = RX_HANDLER_ANOTHER; 516 out: 517 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 518 return handle_res; 519 } 520 521 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 522 { 523 const struct macvlan_dev *vlan = netdev_priv(dev); 524 const struct macvlan_port *port = vlan->port; 525 const struct macvlan_dev *dest; 526 527 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 528 const struct ethhdr *eth = skb_eth_hdr(skb); 529 530 /* send to other bridge ports directly */ 531 if (is_multicast_ether_addr(eth->h_dest)) { 532 skb_reset_mac_header(skb); 533 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 534 goto xmit_world; 535 } 536 537 dest = macvlan_hash_lookup(port, eth->h_dest); 538 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 539 /* send to lowerdev first for its network taps */ 540 dev_forward_skb(vlan->lowerdev, skb); 541 542 return NET_XMIT_SUCCESS; 543 } 544 } 545 xmit_world: 546 skb->dev = vlan->lowerdev; 547 return dev_queue_xmit_accel(skb, 548 netdev_get_sb_channel(dev) ? dev : NULL); 549 } 550 551 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 552 { 553 #ifdef CONFIG_NET_POLL_CONTROLLER 554 return netpoll_send_skb(vlan->netpoll, skb); 555 #else 556 BUG(); 557 return NETDEV_TX_OK; 558 #endif 559 } 560 561 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 562 struct net_device *dev) 563 { 564 struct macvlan_dev *vlan = netdev_priv(dev); 565 unsigned int len = skb->len; 566 int ret; 567 568 if (unlikely(netpoll_tx_running(dev))) 569 return macvlan_netpoll_send_skb(vlan, skb); 570 571 ret = macvlan_queue_xmit(skb, dev); 572 573 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 574 struct vlan_pcpu_stats *pcpu_stats; 575 576 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 577 u64_stats_update_begin(&pcpu_stats->syncp); 578 pcpu_stats->tx_packets++; 579 pcpu_stats->tx_bytes += len; 580 u64_stats_update_end(&pcpu_stats->syncp); 581 } else { 582 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 583 } 584 return ret; 585 } 586 587 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 588 unsigned short type, const void *daddr, 589 const void *saddr, unsigned len) 590 { 591 const struct macvlan_dev *vlan = netdev_priv(dev); 592 struct net_device *lowerdev = vlan->lowerdev; 593 594 return dev_hard_header(skb, lowerdev, type, daddr, 595 saddr ? : dev->dev_addr, len); 596 } 597 598 static const struct header_ops macvlan_hard_header_ops = { 599 .create = macvlan_hard_header, 600 .parse = eth_header_parse, 601 .cache = eth_header_cache, 602 .cache_update = eth_header_cache_update, 603 }; 604 605 static int macvlan_open(struct net_device *dev) 606 { 607 struct macvlan_dev *vlan = netdev_priv(dev); 608 struct net_device *lowerdev = vlan->lowerdev; 609 int err; 610 611 if (macvlan_passthru(vlan->port)) { 612 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 613 err = dev_set_promiscuity(lowerdev, 1); 614 if (err < 0) 615 goto out; 616 } 617 goto hash_add; 618 } 619 620 err = -EADDRINUSE; 621 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 622 goto out; 623 624 /* Attempt to populate accel_priv which is used to offload the L2 625 * forwarding requests for unicast packets. 626 */ 627 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) 628 vlan->accel_priv = 629 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 630 631 /* If earlier attempt to offload failed, or accel_priv is not 632 * populated we must add the unicast address to the lower device. 633 */ 634 if (IS_ERR_OR_NULL(vlan->accel_priv)) { 635 vlan->accel_priv = NULL; 636 err = dev_uc_add(lowerdev, dev->dev_addr); 637 if (err < 0) 638 goto out; 639 } 640 641 if (dev->flags & IFF_ALLMULTI) { 642 err = dev_set_allmulti(lowerdev, 1); 643 if (err < 0) 644 goto del_unicast; 645 } 646 647 if (dev->flags & IFF_PROMISC) { 648 err = dev_set_promiscuity(lowerdev, 1); 649 if (err < 0) 650 goto clear_multi; 651 } 652 653 hash_add: 654 macvlan_hash_add(vlan); 655 return 0; 656 657 clear_multi: 658 if (dev->flags & IFF_ALLMULTI) 659 dev_set_allmulti(lowerdev, -1); 660 del_unicast: 661 if (vlan->accel_priv) { 662 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 663 vlan->accel_priv); 664 vlan->accel_priv = NULL; 665 } else { 666 dev_uc_del(lowerdev, dev->dev_addr); 667 } 668 out: 669 return err; 670 } 671 672 static int macvlan_stop(struct net_device *dev) 673 { 674 struct macvlan_dev *vlan = netdev_priv(dev); 675 struct net_device *lowerdev = vlan->lowerdev; 676 677 if (vlan->accel_priv) { 678 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 679 vlan->accel_priv); 680 vlan->accel_priv = NULL; 681 } 682 683 dev_uc_unsync(lowerdev, dev); 684 dev_mc_unsync(lowerdev, dev); 685 686 if (macvlan_passthru(vlan->port)) { 687 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 688 dev_set_promiscuity(lowerdev, -1); 689 goto hash_del; 690 } 691 692 if (dev->flags & IFF_ALLMULTI) 693 dev_set_allmulti(lowerdev, -1); 694 695 if (dev->flags & IFF_PROMISC) 696 dev_set_promiscuity(lowerdev, -1); 697 698 dev_uc_del(lowerdev, dev->dev_addr); 699 700 hash_del: 701 macvlan_hash_del(vlan, !dev->dismantle); 702 return 0; 703 } 704 705 static int macvlan_sync_address(struct net_device *dev, 706 const unsigned char *addr) 707 { 708 struct macvlan_dev *vlan = netdev_priv(dev); 709 struct net_device *lowerdev = vlan->lowerdev; 710 struct macvlan_port *port = vlan->port; 711 int err; 712 713 if (!(dev->flags & IFF_UP)) { 714 /* Just copy in the new address */ 715 eth_hw_addr_set(dev, addr); 716 } else { 717 /* Rehash and update the device filters */ 718 if (macvlan_addr_busy(vlan->port, addr)) 719 return -EADDRINUSE; 720 721 if (!macvlan_passthru(port)) { 722 err = dev_uc_add(lowerdev, addr); 723 if (err) 724 return err; 725 726 dev_uc_del(lowerdev, dev->dev_addr); 727 } 728 729 macvlan_hash_change_addr(vlan, addr); 730 } 731 if (macvlan_passthru(port) && !macvlan_addr_change(port)) { 732 /* Since addr_change isn't set, we are here due to lower 733 * device change. Save the lower-dev address so we can 734 * restore it later. 735 */ 736 ether_addr_copy(vlan->port->perm_addr, 737 lowerdev->dev_addr); 738 } 739 macvlan_clear_addr_change(port); 740 return 0; 741 } 742 743 static int macvlan_set_mac_address(struct net_device *dev, void *p) 744 { 745 struct macvlan_dev *vlan = netdev_priv(dev); 746 struct sockaddr *addr = p; 747 748 if (!is_valid_ether_addr(addr->sa_data)) 749 return -EADDRNOTAVAIL; 750 751 /* If the addresses are the same, this is a no-op */ 752 if (ether_addr_equal(dev->dev_addr, addr->sa_data)) 753 return 0; 754 755 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 756 macvlan_set_addr_change(vlan->port); 757 return dev_set_mac_address(vlan->lowerdev, addr, NULL); 758 } 759 760 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 761 return -EADDRINUSE; 762 763 return macvlan_sync_address(dev, addr->sa_data); 764 } 765 766 static void macvlan_change_rx_flags(struct net_device *dev, int change) 767 { 768 struct macvlan_dev *vlan = netdev_priv(dev); 769 struct net_device *lowerdev = vlan->lowerdev; 770 771 if (dev->flags & IFF_UP) { 772 if (change & IFF_ALLMULTI) 773 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 774 if (change & IFF_PROMISC) 775 dev_set_promiscuity(lowerdev, 776 dev->flags & IFF_PROMISC ? 1 : -1); 777 778 } 779 } 780 781 static void macvlan_compute_filter(unsigned long *mc_filter, 782 struct net_device *dev, 783 struct macvlan_dev *vlan) 784 { 785 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 786 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 787 } else { 788 struct netdev_hw_addr *ha; 789 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 790 791 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 792 netdev_for_each_mc_addr(ha, dev) { 793 __set_bit(mc_hash(vlan, ha->addr), filter); 794 } 795 796 __set_bit(mc_hash(vlan, dev->broadcast), filter); 797 798 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 799 } 800 } 801 802 static void macvlan_set_mac_lists(struct net_device *dev) 803 { 804 struct macvlan_dev *vlan = netdev_priv(dev); 805 806 macvlan_compute_filter(vlan->mc_filter, dev, vlan); 807 808 dev_uc_sync(vlan->lowerdev, dev); 809 dev_mc_sync(vlan->lowerdev, dev); 810 811 /* This is slightly inaccurate as we're including the subscription 812 * list of vlan->lowerdev too. 813 * 814 * Bug alert: This only works if everyone has the same broadcast 815 * address as lowerdev. As soon as someone changes theirs this 816 * will break. 817 * 818 * However, this is already broken as when you change your broadcast 819 * address we don't get called. 820 * 821 * The solution is to maintain a list of broadcast addresses like 822 * we do for uc/mc, if you care. 823 */ 824 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); 825 } 826 827 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 828 { 829 struct macvlan_dev *vlan = netdev_priv(dev); 830 831 if (vlan->lowerdev->mtu < new_mtu) 832 return -EINVAL; 833 dev->mtu = new_mtu; 834 return 0; 835 } 836 837 static int macvlan_eth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 838 { 839 struct net_device *real_dev = macvlan_dev_real_dev(dev); 840 const struct net_device_ops *ops = real_dev->netdev_ops; 841 struct ifreq ifrr; 842 int err = -EOPNOTSUPP; 843 844 strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 845 ifrr.ifr_ifru = ifr->ifr_ifru; 846 847 switch (cmd) { 848 case SIOCSHWTSTAMP: 849 if (!net_eq(dev_net(dev), &init_net)) 850 break; 851 fallthrough; 852 case SIOCGHWTSTAMP: 853 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) 854 err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); 855 break; 856 } 857 858 if (!err) 859 ifr->ifr_ifru = ifrr.ifr_ifru; 860 861 return err; 862 } 863 864 /* 865 * macvlan network devices have devices nesting below it and are a special 866 * "super class" of normal network devices; split their locks off into a 867 * separate class since they always nest. 868 */ 869 static struct lock_class_key macvlan_netdev_addr_lock_key; 870 871 #define ALWAYS_ON_OFFLOADS \ 872 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ 873 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL) 874 875 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX) 876 877 #define MACVLAN_FEATURES \ 878 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 879 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \ 880 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 881 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 882 883 #define MACVLAN_STATE_MASK \ 884 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 885 886 static void macvlan_set_lockdep_class(struct net_device *dev) 887 { 888 netdev_lockdep_set_classes(dev); 889 lockdep_set_class(&dev->addr_list_lock, 890 &macvlan_netdev_addr_lock_key); 891 } 892 893 static int macvlan_init(struct net_device *dev) 894 { 895 struct macvlan_dev *vlan = netdev_priv(dev); 896 struct net_device *lowerdev = vlan->lowerdev; 897 struct macvlan_port *port = vlan->port; 898 899 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 900 (lowerdev->state & MACVLAN_STATE_MASK); 901 dev->features = lowerdev->features & MACVLAN_FEATURES; 902 dev->features |= ALWAYS_ON_FEATURES; 903 dev->hw_features |= NETIF_F_LRO; 904 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 905 dev->vlan_features |= ALWAYS_ON_OFFLOADS; 906 dev->hw_enc_features |= dev->features; 907 netif_set_gso_max_size(dev, lowerdev->gso_max_size); 908 netif_set_gso_max_segs(dev, lowerdev->gso_max_segs); 909 dev->hard_header_len = lowerdev->hard_header_len; 910 macvlan_set_lockdep_class(dev); 911 912 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 913 if (!vlan->pcpu_stats) 914 return -ENOMEM; 915 916 port->count += 1; 917 918 /* Get macvlan's reference to lowerdev */ 919 dev_hold_track(lowerdev, &vlan->dev_tracker, GFP_KERNEL); 920 921 return 0; 922 } 923 924 static void macvlan_uninit(struct net_device *dev) 925 { 926 struct macvlan_dev *vlan = netdev_priv(dev); 927 struct macvlan_port *port = vlan->port; 928 929 free_percpu(vlan->pcpu_stats); 930 931 macvlan_flush_sources(port, vlan); 932 port->count -= 1; 933 if (!port->count) 934 macvlan_port_destroy(port->dev); 935 } 936 937 static void macvlan_dev_get_stats64(struct net_device *dev, 938 struct rtnl_link_stats64 *stats) 939 { 940 struct macvlan_dev *vlan = netdev_priv(dev); 941 942 if (vlan->pcpu_stats) { 943 struct vlan_pcpu_stats *p; 944 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 945 u32 rx_errors = 0, tx_dropped = 0; 946 unsigned int start; 947 int i; 948 949 for_each_possible_cpu(i) { 950 p = per_cpu_ptr(vlan->pcpu_stats, i); 951 do { 952 start = u64_stats_fetch_begin_irq(&p->syncp); 953 rx_packets = p->rx_packets; 954 rx_bytes = p->rx_bytes; 955 rx_multicast = p->rx_multicast; 956 tx_packets = p->tx_packets; 957 tx_bytes = p->tx_bytes; 958 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 959 960 stats->rx_packets += rx_packets; 961 stats->rx_bytes += rx_bytes; 962 stats->multicast += rx_multicast; 963 stats->tx_packets += tx_packets; 964 stats->tx_bytes += tx_bytes; 965 /* rx_errors & tx_dropped are u32, updated 966 * without syncp protection. 967 */ 968 rx_errors += p->rx_errors; 969 tx_dropped += p->tx_dropped; 970 } 971 stats->rx_errors = rx_errors; 972 stats->rx_dropped = rx_errors; 973 stats->tx_dropped = tx_dropped; 974 } 975 } 976 977 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 978 __be16 proto, u16 vid) 979 { 980 struct macvlan_dev *vlan = netdev_priv(dev); 981 struct net_device *lowerdev = vlan->lowerdev; 982 983 return vlan_vid_add(lowerdev, proto, vid); 984 } 985 986 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 987 __be16 proto, u16 vid) 988 { 989 struct macvlan_dev *vlan = netdev_priv(dev); 990 struct net_device *lowerdev = vlan->lowerdev; 991 992 vlan_vid_del(lowerdev, proto, vid); 993 return 0; 994 } 995 996 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 997 struct net_device *dev, 998 const unsigned char *addr, u16 vid, 999 u16 flags, 1000 struct netlink_ext_ack *extack) 1001 { 1002 struct macvlan_dev *vlan = netdev_priv(dev); 1003 int err = -EINVAL; 1004 1005 /* Support unicast filter only on passthru devices. 1006 * Multicast filter should be allowed on all devices. 1007 */ 1008 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1009 return -EOPNOTSUPP; 1010 1011 if (flags & NLM_F_REPLACE) 1012 return -EOPNOTSUPP; 1013 1014 if (is_unicast_ether_addr(addr)) 1015 err = dev_uc_add_excl(dev, addr); 1016 else if (is_multicast_ether_addr(addr)) 1017 err = dev_mc_add_excl(dev, addr); 1018 1019 return err; 1020 } 1021 1022 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 1023 struct net_device *dev, 1024 const unsigned char *addr, u16 vid) 1025 { 1026 struct macvlan_dev *vlan = netdev_priv(dev); 1027 int err = -EINVAL; 1028 1029 /* Support unicast filter only on passthru devices. 1030 * Multicast filter should be allowed on all devices. 1031 */ 1032 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1033 return -EOPNOTSUPP; 1034 1035 if (is_unicast_ether_addr(addr)) 1036 err = dev_uc_del(dev, addr); 1037 else if (is_multicast_ether_addr(addr)) 1038 err = dev_mc_del(dev, addr); 1039 1040 return err; 1041 } 1042 1043 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 1044 struct ethtool_drvinfo *drvinfo) 1045 { 1046 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 1047 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 1048 } 1049 1050 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 1051 struct ethtool_link_ksettings *cmd) 1052 { 1053 const struct macvlan_dev *vlan = netdev_priv(dev); 1054 1055 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 1056 } 1057 1058 static int macvlan_ethtool_get_ts_info(struct net_device *dev, 1059 struct ethtool_ts_info *info) 1060 { 1061 struct net_device *real_dev = macvlan_dev_real_dev(dev); 1062 const struct ethtool_ops *ops = real_dev->ethtool_ops; 1063 struct phy_device *phydev = real_dev->phydev; 1064 1065 if (phy_has_tsinfo(phydev)) { 1066 return phy_ts_info(phydev, info); 1067 } else if (ops->get_ts_info) { 1068 return ops->get_ts_info(real_dev, info); 1069 } else { 1070 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 1071 SOF_TIMESTAMPING_SOFTWARE; 1072 info->phc_index = -1; 1073 } 1074 1075 return 0; 1076 } 1077 1078 static netdev_features_t macvlan_fix_features(struct net_device *dev, 1079 netdev_features_t features) 1080 { 1081 struct macvlan_dev *vlan = netdev_priv(dev); 1082 netdev_features_t lowerdev_features = vlan->lowerdev->features; 1083 netdev_features_t mask; 1084 1085 features |= NETIF_F_ALL_FOR_ALL; 1086 features &= (vlan->set_features | ~MACVLAN_FEATURES); 1087 mask = features; 1088 1089 lowerdev_features &= (features | ~NETIF_F_LRO); 1090 features = netdev_increment_features(lowerdev_features, features, mask); 1091 features |= ALWAYS_ON_FEATURES; 1092 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES); 1093 1094 return features; 1095 } 1096 1097 #ifdef CONFIG_NET_POLL_CONTROLLER 1098 static void macvlan_dev_poll_controller(struct net_device *dev) 1099 { 1100 return; 1101 } 1102 1103 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 1104 { 1105 struct macvlan_dev *vlan = netdev_priv(dev); 1106 struct net_device *real_dev = vlan->lowerdev; 1107 struct netpoll *netpoll; 1108 int err; 1109 1110 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 1111 err = -ENOMEM; 1112 if (!netpoll) 1113 goto out; 1114 1115 err = __netpoll_setup(netpoll, real_dev); 1116 if (err) { 1117 kfree(netpoll); 1118 goto out; 1119 } 1120 1121 vlan->netpoll = netpoll; 1122 1123 out: 1124 return err; 1125 } 1126 1127 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1128 { 1129 struct macvlan_dev *vlan = netdev_priv(dev); 1130 struct netpoll *netpoll = vlan->netpoll; 1131 1132 if (!netpoll) 1133 return; 1134 1135 vlan->netpoll = NULL; 1136 1137 __netpoll_free(netpoll); 1138 } 1139 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1140 1141 static int macvlan_dev_get_iflink(const struct net_device *dev) 1142 { 1143 struct macvlan_dev *vlan = netdev_priv(dev); 1144 1145 return vlan->lowerdev->ifindex; 1146 } 1147 1148 static const struct ethtool_ops macvlan_ethtool_ops = { 1149 .get_link = ethtool_op_get_link, 1150 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1151 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1152 .get_ts_info = macvlan_ethtool_get_ts_info, 1153 }; 1154 1155 static const struct net_device_ops macvlan_netdev_ops = { 1156 .ndo_init = macvlan_init, 1157 .ndo_uninit = macvlan_uninit, 1158 .ndo_open = macvlan_open, 1159 .ndo_stop = macvlan_stop, 1160 .ndo_start_xmit = macvlan_start_xmit, 1161 .ndo_change_mtu = macvlan_change_mtu, 1162 .ndo_eth_ioctl = macvlan_eth_ioctl, 1163 .ndo_fix_features = macvlan_fix_features, 1164 .ndo_change_rx_flags = macvlan_change_rx_flags, 1165 .ndo_set_mac_address = macvlan_set_mac_address, 1166 .ndo_set_rx_mode = macvlan_set_mac_lists, 1167 .ndo_get_stats64 = macvlan_dev_get_stats64, 1168 .ndo_validate_addr = eth_validate_addr, 1169 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1170 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1171 .ndo_fdb_add = macvlan_fdb_add, 1172 .ndo_fdb_del = macvlan_fdb_del, 1173 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1174 #ifdef CONFIG_NET_POLL_CONTROLLER 1175 .ndo_poll_controller = macvlan_dev_poll_controller, 1176 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1177 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1178 #endif 1179 .ndo_get_iflink = macvlan_dev_get_iflink, 1180 .ndo_features_check = passthru_features_check, 1181 }; 1182 1183 static void macvlan_dev_free(struct net_device *dev) 1184 { 1185 struct macvlan_dev *vlan = netdev_priv(dev); 1186 1187 /* Get rid of the macvlan's reference to lowerdev */ 1188 dev_put_track(vlan->lowerdev, &vlan->dev_tracker); 1189 } 1190 1191 void macvlan_common_setup(struct net_device *dev) 1192 { 1193 ether_setup(dev); 1194 1195 dev->min_mtu = 0; 1196 dev->max_mtu = ETH_MAX_MTU; 1197 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1198 netif_keep_dst(dev); 1199 dev->priv_flags |= IFF_UNICAST_FLT | IFF_CHANGE_PROTO_DOWN; 1200 dev->netdev_ops = &macvlan_netdev_ops; 1201 dev->needs_free_netdev = true; 1202 dev->priv_destructor = macvlan_dev_free; 1203 dev->header_ops = &macvlan_hard_header_ops; 1204 dev->ethtool_ops = &macvlan_ethtool_ops; 1205 } 1206 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1207 1208 static void macvlan_setup(struct net_device *dev) 1209 { 1210 macvlan_common_setup(dev); 1211 dev->priv_flags |= IFF_NO_QUEUE; 1212 } 1213 1214 static int macvlan_port_create(struct net_device *dev) 1215 { 1216 struct macvlan_port *port; 1217 unsigned int i; 1218 int err; 1219 1220 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1221 return -EINVAL; 1222 1223 if (netdev_is_rx_handler_busy(dev)) 1224 return -EBUSY; 1225 1226 port = kzalloc(sizeof(*port), GFP_KERNEL); 1227 if (port == NULL) 1228 return -ENOMEM; 1229 1230 port->dev = dev; 1231 ether_addr_copy(port->perm_addr, dev->dev_addr); 1232 INIT_LIST_HEAD(&port->vlans); 1233 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1234 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1235 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1236 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1237 1238 port->bc_queue_len_used = 0; 1239 skb_queue_head_init(&port->bc_queue); 1240 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1241 1242 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1243 if (err) 1244 kfree(port); 1245 else 1246 dev->priv_flags |= IFF_MACVLAN_PORT; 1247 return err; 1248 } 1249 1250 static void macvlan_port_destroy(struct net_device *dev) 1251 { 1252 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1253 struct sk_buff *skb; 1254 1255 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1256 netdev_rx_handler_unregister(dev); 1257 1258 /* After this point, no packet can schedule bc_work anymore, 1259 * but we need to cancel it and purge left skbs if any. 1260 */ 1261 cancel_work_sync(&port->bc_work); 1262 1263 while ((skb = __skb_dequeue(&port->bc_queue))) { 1264 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 1265 1266 if (src) 1267 dev_put(src->dev); 1268 1269 kfree_skb(skb); 1270 } 1271 1272 /* If the lower device address has been changed by passthru 1273 * macvlan, put it back. 1274 */ 1275 if (macvlan_passthru(port) && 1276 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { 1277 struct sockaddr sa; 1278 1279 sa.sa_family = port->dev->type; 1280 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len); 1281 dev_set_mac_address(port->dev, &sa, NULL); 1282 } 1283 1284 kfree(port); 1285 } 1286 1287 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[], 1288 struct netlink_ext_ack *extack) 1289 { 1290 struct nlattr *nla, *head; 1291 int rem, len; 1292 1293 if (tb[IFLA_ADDRESS]) { 1294 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1295 return -EINVAL; 1296 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1297 return -EADDRNOTAVAIL; 1298 } 1299 1300 if (!data) 1301 return 0; 1302 1303 if (data[IFLA_MACVLAN_FLAGS] && 1304 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC | 1305 MACVLAN_FLAG_NODST)) 1306 return -EINVAL; 1307 1308 if (data[IFLA_MACVLAN_MODE]) { 1309 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1310 case MACVLAN_MODE_PRIVATE: 1311 case MACVLAN_MODE_VEPA: 1312 case MACVLAN_MODE_BRIDGE: 1313 case MACVLAN_MODE_PASSTHRU: 1314 case MACVLAN_MODE_SOURCE: 1315 break; 1316 default: 1317 return -EINVAL; 1318 } 1319 } 1320 1321 if (data[IFLA_MACVLAN_MACADDR_MODE]) { 1322 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1323 case MACVLAN_MACADDR_ADD: 1324 case MACVLAN_MACADDR_DEL: 1325 case MACVLAN_MACADDR_FLUSH: 1326 case MACVLAN_MACADDR_SET: 1327 break; 1328 default: 1329 return -EINVAL; 1330 } 1331 } 1332 1333 if (data[IFLA_MACVLAN_MACADDR]) { 1334 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1335 return -EINVAL; 1336 1337 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1338 return -EADDRNOTAVAIL; 1339 } 1340 1341 if (data[IFLA_MACVLAN_MACADDR_DATA]) { 1342 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1343 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1344 1345 nla_for_each_attr(nla, head, len, rem) { 1346 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1347 nla_len(nla) != ETH_ALEN) 1348 return -EINVAL; 1349 1350 if (!is_valid_ether_addr(nla_data(nla))) 1351 return -EADDRNOTAVAIL; 1352 } 1353 } 1354 1355 if (data[IFLA_MACVLAN_MACADDR_COUNT]) 1356 return -EINVAL; 1357 1358 return 0; 1359 } 1360 1361 /* 1362 * reconfigure list of remote source mac address 1363 * (only for macvlan devices in source mode) 1364 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1365 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1366 */ 1367 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1368 struct nlattr *data[]) 1369 { 1370 char *addr = NULL; 1371 int ret, rem, len; 1372 struct nlattr *nla, *head; 1373 struct macvlan_source_entry *entry; 1374 1375 if (data[IFLA_MACVLAN_MACADDR]) 1376 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1377 1378 if (mode == MACVLAN_MACADDR_ADD) { 1379 if (!addr) 1380 return -EINVAL; 1381 1382 return macvlan_hash_add_source(vlan, addr); 1383 1384 } else if (mode == MACVLAN_MACADDR_DEL) { 1385 if (!addr) 1386 return -EINVAL; 1387 1388 entry = macvlan_hash_lookup_source(vlan, addr); 1389 if (entry) { 1390 macvlan_hash_del_source(entry); 1391 vlan->macaddr_count--; 1392 } 1393 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1394 macvlan_flush_sources(vlan->port, vlan); 1395 } else if (mode == MACVLAN_MACADDR_SET) { 1396 macvlan_flush_sources(vlan->port, vlan); 1397 1398 if (addr) { 1399 ret = macvlan_hash_add_source(vlan, addr); 1400 if (ret) 1401 return ret; 1402 } 1403 1404 if (!data[IFLA_MACVLAN_MACADDR_DATA]) 1405 return 0; 1406 1407 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1408 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1409 1410 nla_for_each_attr(nla, head, len, rem) { 1411 addr = nla_data(nla); 1412 ret = macvlan_hash_add_source(vlan, addr); 1413 if (ret) 1414 return ret; 1415 } 1416 } else { 1417 return -EINVAL; 1418 } 1419 1420 return 0; 1421 } 1422 1423 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1424 struct nlattr *tb[], struct nlattr *data[], 1425 struct netlink_ext_ack *extack) 1426 { 1427 struct macvlan_dev *vlan = netdev_priv(dev); 1428 struct macvlan_port *port; 1429 struct net_device *lowerdev; 1430 int err; 1431 int macmode; 1432 bool create = false; 1433 1434 if (!tb[IFLA_LINK]) 1435 return -EINVAL; 1436 1437 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1438 if (lowerdev == NULL) 1439 return -ENODEV; 1440 1441 /* When creating macvlans or macvtaps on top of other macvlans - use 1442 * the real device as the lowerdev. 1443 */ 1444 if (netif_is_macvlan(lowerdev)) 1445 lowerdev = macvlan_dev_real_dev(lowerdev); 1446 1447 if (!tb[IFLA_MTU]) 1448 dev->mtu = lowerdev->mtu; 1449 else if (dev->mtu > lowerdev->mtu) 1450 return -EINVAL; 1451 1452 /* MTU range: 68 - lowerdev->max_mtu */ 1453 dev->min_mtu = ETH_MIN_MTU; 1454 dev->max_mtu = lowerdev->max_mtu; 1455 1456 if (!tb[IFLA_ADDRESS]) 1457 eth_hw_addr_random(dev); 1458 1459 if (!netif_is_macvlan_port(lowerdev)) { 1460 err = macvlan_port_create(lowerdev); 1461 if (err < 0) 1462 return err; 1463 create = true; 1464 } 1465 port = macvlan_port_get_rtnl(lowerdev); 1466 1467 /* Only 1 macvlan device can be created in passthru mode */ 1468 if (macvlan_passthru(port)) { 1469 /* The macvlan port must be not created this time, 1470 * still goto destroy_macvlan_port for readability. 1471 */ 1472 err = -EINVAL; 1473 goto destroy_macvlan_port; 1474 } 1475 1476 vlan->lowerdev = lowerdev; 1477 vlan->dev = dev; 1478 vlan->port = port; 1479 vlan->set_features = MACVLAN_FEATURES; 1480 1481 vlan->mode = MACVLAN_MODE_VEPA; 1482 if (data && data[IFLA_MACVLAN_MODE]) 1483 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1484 1485 if (data && data[IFLA_MACVLAN_FLAGS]) 1486 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1487 1488 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1489 if (port->count) { 1490 err = -EINVAL; 1491 goto destroy_macvlan_port; 1492 } 1493 macvlan_set_passthru(port); 1494 eth_hw_addr_inherit(dev, lowerdev); 1495 } 1496 1497 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1498 if (vlan->mode != MACVLAN_MODE_SOURCE) { 1499 err = -EINVAL; 1500 goto destroy_macvlan_port; 1501 } 1502 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1503 err = macvlan_changelink_sources(vlan, macmode, data); 1504 if (err) 1505 goto destroy_macvlan_port; 1506 } 1507 1508 vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN; 1509 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) 1510 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]); 1511 1512 err = register_netdevice(dev); 1513 if (err < 0) 1514 goto destroy_macvlan_port; 1515 1516 dev->priv_flags |= IFF_MACVLAN; 1517 err = netdev_upper_dev_link(lowerdev, dev, extack); 1518 if (err) 1519 goto unregister_netdev; 1520 1521 list_add_tail_rcu(&vlan->list, &port->vlans); 1522 update_port_bc_queue_len(vlan->port); 1523 netif_stacked_transfer_operstate(lowerdev, dev); 1524 linkwatch_fire_event(dev); 1525 1526 return 0; 1527 1528 unregister_netdev: 1529 /* macvlan_uninit would free the macvlan port */ 1530 unregister_netdevice(dev); 1531 return err; 1532 destroy_macvlan_port: 1533 /* the macvlan port may be freed by macvlan_uninit when fail to register. 1534 * so we destroy the macvlan port only when it's valid. 1535 */ 1536 if (create && macvlan_port_get_rtnl(lowerdev)) 1537 macvlan_port_destroy(port->dev); 1538 return err; 1539 } 1540 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1541 1542 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1543 struct nlattr *tb[], struct nlattr *data[], 1544 struct netlink_ext_ack *extack) 1545 { 1546 return macvlan_common_newlink(src_net, dev, tb, data, extack); 1547 } 1548 1549 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1550 { 1551 struct macvlan_dev *vlan = netdev_priv(dev); 1552 1553 if (vlan->mode == MACVLAN_MODE_SOURCE) 1554 macvlan_flush_sources(vlan->port, vlan); 1555 list_del_rcu(&vlan->list); 1556 update_port_bc_queue_len(vlan->port); 1557 unregister_netdevice_queue(dev, head); 1558 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1559 } 1560 EXPORT_SYMBOL_GPL(macvlan_dellink); 1561 1562 static int macvlan_changelink(struct net_device *dev, 1563 struct nlattr *tb[], struct nlattr *data[], 1564 struct netlink_ext_ack *extack) 1565 { 1566 struct macvlan_dev *vlan = netdev_priv(dev); 1567 enum macvlan_mode mode; 1568 bool set_mode = false; 1569 enum macvlan_macaddr_mode macmode; 1570 int ret; 1571 1572 /* Validate mode, but don't set yet: setting flags may fail. */ 1573 if (data && data[IFLA_MACVLAN_MODE]) { 1574 set_mode = true; 1575 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1576 /* Passthrough mode can't be set or cleared dynamically */ 1577 if ((mode == MACVLAN_MODE_PASSTHRU) != 1578 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1579 return -EINVAL; 1580 if (vlan->mode == MACVLAN_MODE_SOURCE && 1581 vlan->mode != mode) 1582 macvlan_flush_sources(vlan->port, vlan); 1583 } 1584 1585 if (data && data[IFLA_MACVLAN_FLAGS]) { 1586 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1587 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1588 if (macvlan_passthru(vlan->port) && promisc) { 1589 int err; 1590 1591 if (flags & MACVLAN_FLAG_NOPROMISC) 1592 err = dev_set_promiscuity(vlan->lowerdev, -1); 1593 else 1594 err = dev_set_promiscuity(vlan->lowerdev, 1); 1595 if (err < 0) 1596 return err; 1597 } 1598 vlan->flags = flags; 1599 } 1600 1601 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) { 1602 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]); 1603 update_port_bc_queue_len(vlan->port); 1604 } 1605 1606 if (set_mode) 1607 vlan->mode = mode; 1608 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1609 if (vlan->mode != MACVLAN_MODE_SOURCE) 1610 return -EINVAL; 1611 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1612 ret = macvlan_changelink_sources(vlan, macmode, data); 1613 if (ret) 1614 return ret; 1615 } 1616 return 0; 1617 } 1618 1619 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1620 { 1621 if (vlan->macaddr_count == 0) 1622 return 0; 1623 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1624 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1625 } 1626 1627 static size_t macvlan_get_size(const struct net_device *dev) 1628 { 1629 struct macvlan_dev *vlan = netdev_priv(dev); 1630 1631 return (0 1632 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1633 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1634 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1635 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1636 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */ 1637 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */ 1638 ); 1639 } 1640 1641 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1642 const struct macvlan_dev *vlan, 1643 const int i) 1644 { 1645 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1646 struct macvlan_source_entry *entry; 1647 1648 hlist_for_each_entry_rcu(entry, h, hlist) { 1649 if (entry->vlan != vlan) 1650 continue; 1651 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1652 return 1; 1653 } 1654 return 0; 1655 } 1656 1657 static int macvlan_fill_info(struct sk_buff *skb, 1658 const struct net_device *dev) 1659 { 1660 struct macvlan_dev *vlan = netdev_priv(dev); 1661 struct macvlan_port *port = vlan->port; 1662 int i; 1663 struct nlattr *nest; 1664 1665 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1666 goto nla_put_failure; 1667 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1668 goto nla_put_failure; 1669 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1670 goto nla_put_failure; 1671 if (vlan->macaddr_count > 0) { 1672 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA); 1673 if (nest == NULL) 1674 goto nla_put_failure; 1675 1676 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1677 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1678 goto nla_put_failure; 1679 } 1680 nla_nest_end(skb, nest); 1681 } 1682 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req)) 1683 goto nla_put_failure; 1684 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used)) 1685 goto nla_put_failure; 1686 return 0; 1687 1688 nla_put_failure: 1689 return -EMSGSIZE; 1690 } 1691 1692 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1693 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1694 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1695 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1696 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1697 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1698 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1699 [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 }, 1700 [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT }, 1701 }; 1702 1703 int macvlan_link_register(struct rtnl_link_ops *ops) 1704 { 1705 /* common fields */ 1706 ops->validate = macvlan_validate; 1707 ops->maxtype = IFLA_MACVLAN_MAX; 1708 ops->policy = macvlan_policy; 1709 ops->changelink = macvlan_changelink; 1710 ops->get_size = macvlan_get_size; 1711 ops->fill_info = macvlan_fill_info; 1712 1713 return rtnl_link_register(ops); 1714 }; 1715 EXPORT_SYMBOL_GPL(macvlan_link_register); 1716 1717 static struct net *macvlan_get_link_net(const struct net_device *dev) 1718 { 1719 return dev_net(macvlan_dev_real_dev(dev)); 1720 } 1721 1722 static struct rtnl_link_ops macvlan_link_ops = { 1723 .kind = "macvlan", 1724 .setup = macvlan_setup, 1725 .newlink = macvlan_newlink, 1726 .dellink = macvlan_dellink, 1727 .get_link_net = macvlan_get_link_net, 1728 .priv_size = sizeof(struct macvlan_dev), 1729 }; 1730 1731 static void update_port_bc_queue_len(struct macvlan_port *port) 1732 { 1733 u32 max_bc_queue_len_req = 0; 1734 struct macvlan_dev *vlan; 1735 1736 list_for_each_entry(vlan, &port->vlans, list) { 1737 if (vlan->bc_queue_len_req > max_bc_queue_len_req) 1738 max_bc_queue_len_req = vlan->bc_queue_len_req; 1739 } 1740 port->bc_queue_len_used = max_bc_queue_len_req; 1741 } 1742 1743 static int macvlan_device_event(struct notifier_block *unused, 1744 unsigned long event, void *ptr) 1745 { 1746 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1747 struct macvlan_dev *vlan, *next; 1748 struct macvlan_port *port; 1749 LIST_HEAD(list_kill); 1750 1751 if (!netif_is_macvlan_port(dev)) 1752 return NOTIFY_DONE; 1753 1754 port = macvlan_port_get_rtnl(dev); 1755 1756 switch (event) { 1757 case NETDEV_UP: 1758 case NETDEV_DOWN: 1759 case NETDEV_CHANGE: 1760 list_for_each_entry(vlan, &port->vlans, list) 1761 netif_stacked_transfer_operstate(vlan->lowerdev, 1762 vlan->dev); 1763 break; 1764 case NETDEV_FEAT_CHANGE: 1765 list_for_each_entry(vlan, &port->vlans, list) { 1766 netif_set_gso_max_size(vlan->dev, dev->gso_max_size); 1767 netif_set_gso_max_segs(vlan->dev, dev->gso_max_segs); 1768 netdev_update_features(vlan->dev); 1769 } 1770 break; 1771 case NETDEV_CHANGEMTU: 1772 list_for_each_entry(vlan, &port->vlans, list) { 1773 if (vlan->dev->mtu <= dev->mtu) 1774 continue; 1775 dev_set_mtu(vlan->dev, dev->mtu); 1776 } 1777 break; 1778 case NETDEV_CHANGEADDR: 1779 if (!macvlan_passthru(port)) 1780 return NOTIFY_DONE; 1781 1782 vlan = list_first_entry_or_null(&port->vlans, 1783 struct macvlan_dev, 1784 list); 1785 1786 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr)) 1787 return NOTIFY_BAD; 1788 1789 break; 1790 case NETDEV_UNREGISTER: 1791 /* twiddle thumbs on netns device moves */ 1792 if (dev->reg_state != NETREG_UNREGISTERING) 1793 break; 1794 1795 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1796 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1797 unregister_netdevice_many(&list_kill); 1798 break; 1799 case NETDEV_PRE_TYPE_CHANGE: 1800 /* Forbid underlying device to change its type. */ 1801 return NOTIFY_BAD; 1802 1803 case NETDEV_NOTIFY_PEERS: 1804 case NETDEV_BONDING_FAILOVER: 1805 case NETDEV_RESEND_IGMP: 1806 /* Propagate to all vlans */ 1807 list_for_each_entry(vlan, &port->vlans, list) 1808 call_netdevice_notifiers(event, vlan->dev); 1809 } 1810 return NOTIFY_DONE; 1811 } 1812 1813 static struct notifier_block macvlan_notifier_block __read_mostly = { 1814 .notifier_call = macvlan_device_event, 1815 }; 1816 1817 static int __init macvlan_init_module(void) 1818 { 1819 int err; 1820 1821 register_netdevice_notifier(&macvlan_notifier_block); 1822 1823 err = macvlan_link_register(&macvlan_link_ops); 1824 if (err < 0) 1825 goto err1; 1826 return 0; 1827 err1: 1828 unregister_netdevice_notifier(&macvlan_notifier_block); 1829 return err; 1830 } 1831 1832 static void __exit macvlan_cleanup_module(void) 1833 { 1834 rtnl_link_unregister(&macvlan_link_ops); 1835 unregister_netdevice_notifier(&macvlan_notifier_block); 1836 } 1837 1838 module_init(macvlan_init_module); 1839 module_exit(macvlan_cleanup_module); 1840 1841 MODULE_LICENSE("GPL"); 1842 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1843 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1844 MODULE_ALIAS_RTNL_LINK("macvlan"); 1845