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 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 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_ni(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 atomic_long_inc(&skb->dev->rx_dropped); 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 return RX_HANDLER_CONSUMED; 465 src = macvlan_hash_lookup(port, eth->h_source); 466 if (src && src->mode != MACVLAN_MODE_VEPA && 467 src->mode != MACVLAN_MODE_BRIDGE) { 468 /* forward to original port. */ 469 vlan = src; 470 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 471 netif_rx(skb); 472 handle_res = RX_HANDLER_CONSUMED; 473 goto out; 474 } 475 476 hash = mc_hash(NULL, eth->h_dest); 477 if (test_bit(hash, port->mc_filter)) 478 macvlan_broadcast_enqueue(port, src, skb); 479 480 return RX_HANDLER_PASS; 481 } 482 483 if (macvlan_forward_source(skb, port, eth->h_source)) 484 return RX_HANDLER_CONSUMED; 485 if (macvlan_passthru(port)) 486 vlan = list_first_or_null_rcu(&port->vlans, 487 struct macvlan_dev, list); 488 else 489 vlan = macvlan_hash_lookup(port, eth->h_dest); 490 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE) 491 return RX_HANDLER_PASS; 492 493 dev = vlan->dev; 494 if (unlikely(!(dev->flags & IFF_UP))) { 495 kfree_skb(skb); 496 return RX_HANDLER_CONSUMED; 497 } 498 len = skb->len + ETH_HLEN; 499 skb = skb_share_check(skb, GFP_ATOMIC); 500 if (!skb) { 501 ret = NET_RX_DROP; 502 handle_res = RX_HANDLER_CONSUMED; 503 goto out; 504 } 505 506 *pskb = skb; 507 skb->dev = dev; 508 skb->pkt_type = PACKET_HOST; 509 510 ret = NET_RX_SUCCESS; 511 handle_res = RX_HANDLER_ANOTHER; 512 out: 513 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 514 return handle_res; 515 } 516 517 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 518 { 519 const struct macvlan_dev *vlan = netdev_priv(dev); 520 const struct macvlan_port *port = vlan->port; 521 const struct macvlan_dev *dest; 522 523 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 524 const struct ethhdr *eth = skb_eth_hdr(skb); 525 526 /* send to other bridge ports directly */ 527 if (is_multicast_ether_addr(eth->h_dest)) { 528 skb_reset_mac_header(skb); 529 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 530 goto xmit_world; 531 } 532 533 dest = macvlan_hash_lookup(port, eth->h_dest); 534 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 535 /* send to lowerdev first for its network taps */ 536 dev_forward_skb(vlan->lowerdev, skb); 537 538 return NET_XMIT_SUCCESS; 539 } 540 } 541 xmit_world: 542 skb->dev = vlan->lowerdev; 543 return dev_queue_xmit_accel(skb, 544 netdev_get_sb_channel(dev) ? dev : NULL); 545 } 546 547 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 548 { 549 #ifdef CONFIG_NET_POLL_CONTROLLER 550 return netpoll_send_skb(vlan->netpoll, skb); 551 #else 552 BUG(); 553 return NETDEV_TX_OK; 554 #endif 555 } 556 557 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 558 struct net_device *dev) 559 { 560 struct macvlan_dev *vlan = netdev_priv(dev); 561 unsigned int len = skb->len; 562 int ret; 563 564 if (unlikely(netpoll_tx_running(dev))) 565 return macvlan_netpoll_send_skb(vlan, skb); 566 567 ret = macvlan_queue_xmit(skb, dev); 568 569 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 570 struct vlan_pcpu_stats *pcpu_stats; 571 572 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 573 u64_stats_update_begin(&pcpu_stats->syncp); 574 pcpu_stats->tx_packets++; 575 pcpu_stats->tx_bytes += len; 576 u64_stats_update_end(&pcpu_stats->syncp); 577 } else { 578 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 579 } 580 return ret; 581 } 582 583 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 584 unsigned short type, const void *daddr, 585 const void *saddr, unsigned len) 586 { 587 const struct macvlan_dev *vlan = netdev_priv(dev); 588 struct net_device *lowerdev = vlan->lowerdev; 589 590 return dev_hard_header(skb, lowerdev, type, daddr, 591 saddr ? : dev->dev_addr, len); 592 } 593 594 static const struct header_ops macvlan_hard_header_ops = { 595 .create = macvlan_hard_header, 596 .parse = eth_header_parse, 597 .cache = eth_header_cache, 598 .cache_update = eth_header_cache_update, 599 }; 600 601 static int macvlan_open(struct net_device *dev) 602 { 603 struct macvlan_dev *vlan = netdev_priv(dev); 604 struct net_device *lowerdev = vlan->lowerdev; 605 int err; 606 607 if (macvlan_passthru(vlan->port)) { 608 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 609 err = dev_set_promiscuity(lowerdev, 1); 610 if (err < 0) 611 goto out; 612 } 613 goto hash_add; 614 } 615 616 err = -EADDRINUSE; 617 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 618 goto out; 619 620 /* Attempt to populate accel_priv which is used to offload the L2 621 * forwarding requests for unicast packets. 622 */ 623 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) 624 vlan->accel_priv = 625 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 626 627 /* If earlier attempt to offload failed, or accel_priv is not 628 * populated we must add the unicast address to the lower device. 629 */ 630 if (IS_ERR_OR_NULL(vlan->accel_priv)) { 631 vlan->accel_priv = NULL; 632 err = dev_uc_add(lowerdev, dev->dev_addr); 633 if (err < 0) 634 goto out; 635 } 636 637 if (dev->flags & IFF_ALLMULTI) { 638 err = dev_set_allmulti(lowerdev, 1); 639 if (err < 0) 640 goto del_unicast; 641 } 642 643 if (dev->flags & IFF_PROMISC) { 644 err = dev_set_promiscuity(lowerdev, 1); 645 if (err < 0) 646 goto clear_multi; 647 } 648 649 hash_add: 650 macvlan_hash_add(vlan); 651 return 0; 652 653 clear_multi: 654 if (dev->flags & IFF_ALLMULTI) 655 dev_set_allmulti(lowerdev, -1); 656 del_unicast: 657 if (vlan->accel_priv) { 658 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 659 vlan->accel_priv); 660 vlan->accel_priv = NULL; 661 } else { 662 dev_uc_del(lowerdev, dev->dev_addr); 663 } 664 out: 665 return err; 666 } 667 668 static int macvlan_stop(struct net_device *dev) 669 { 670 struct macvlan_dev *vlan = netdev_priv(dev); 671 struct net_device *lowerdev = vlan->lowerdev; 672 673 if (vlan->accel_priv) { 674 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 675 vlan->accel_priv); 676 vlan->accel_priv = NULL; 677 } 678 679 dev_uc_unsync(lowerdev, dev); 680 dev_mc_unsync(lowerdev, dev); 681 682 if (macvlan_passthru(vlan->port)) { 683 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 684 dev_set_promiscuity(lowerdev, -1); 685 goto hash_del; 686 } 687 688 if (dev->flags & IFF_ALLMULTI) 689 dev_set_allmulti(lowerdev, -1); 690 691 if (dev->flags & IFF_PROMISC) 692 dev_set_promiscuity(lowerdev, -1); 693 694 dev_uc_del(lowerdev, dev->dev_addr); 695 696 hash_del: 697 macvlan_hash_del(vlan, !dev->dismantle); 698 return 0; 699 } 700 701 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 702 { 703 struct macvlan_dev *vlan = netdev_priv(dev); 704 struct net_device *lowerdev = vlan->lowerdev; 705 struct macvlan_port *port = vlan->port; 706 int err; 707 708 if (!(dev->flags & IFF_UP)) { 709 /* Just copy in the new address */ 710 ether_addr_copy(dev->dev_addr, addr); 711 } else { 712 /* Rehash and update the device filters */ 713 if (macvlan_addr_busy(vlan->port, addr)) 714 return -EADDRINUSE; 715 716 if (!macvlan_passthru(port)) { 717 err = dev_uc_add(lowerdev, addr); 718 if (err) 719 return err; 720 721 dev_uc_del(lowerdev, dev->dev_addr); 722 } 723 724 macvlan_hash_change_addr(vlan, addr); 725 } 726 if (macvlan_passthru(port) && !macvlan_addr_change(port)) { 727 /* Since addr_change isn't set, we are here due to lower 728 * device change. Save the lower-dev address so we can 729 * restore it later. 730 */ 731 ether_addr_copy(vlan->port->perm_addr, 732 lowerdev->dev_addr); 733 } 734 macvlan_clear_addr_change(port); 735 return 0; 736 } 737 738 static int macvlan_set_mac_address(struct net_device *dev, void *p) 739 { 740 struct macvlan_dev *vlan = netdev_priv(dev); 741 struct sockaddr *addr = p; 742 743 if (!is_valid_ether_addr(addr->sa_data)) 744 return -EADDRNOTAVAIL; 745 746 /* If the addresses are the same, this is a no-op */ 747 if (ether_addr_equal(dev->dev_addr, addr->sa_data)) 748 return 0; 749 750 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 751 macvlan_set_addr_change(vlan->port); 752 return dev_set_mac_address(vlan->lowerdev, addr, NULL); 753 } 754 755 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 756 return -EADDRINUSE; 757 758 return macvlan_sync_address(dev, addr->sa_data); 759 } 760 761 static void macvlan_change_rx_flags(struct net_device *dev, int change) 762 { 763 struct macvlan_dev *vlan = netdev_priv(dev); 764 struct net_device *lowerdev = vlan->lowerdev; 765 766 if (dev->flags & IFF_UP) { 767 if (change & IFF_ALLMULTI) 768 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 769 if (change & IFF_PROMISC) 770 dev_set_promiscuity(lowerdev, 771 dev->flags & IFF_PROMISC ? 1 : -1); 772 773 } 774 } 775 776 static void macvlan_compute_filter(unsigned long *mc_filter, 777 struct net_device *dev, 778 struct macvlan_dev *vlan) 779 { 780 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 781 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 782 } else { 783 struct netdev_hw_addr *ha; 784 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 785 786 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 787 netdev_for_each_mc_addr(ha, dev) { 788 __set_bit(mc_hash(vlan, ha->addr), filter); 789 } 790 791 __set_bit(mc_hash(vlan, dev->broadcast), filter); 792 793 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 794 } 795 } 796 797 static void macvlan_set_mac_lists(struct net_device *dev) 798 { 799 struct macvlan_dev *vlan = netdev_priv(dev); 800 801 macvlan_compute_filter(vlan->mc_filter, dev, vlan); 802 803 dev_uc_sync(vlan->lowerdev, dev); 804 dev_mc_sync(vlan->lowerdev, dev); 805 806 /* This is slightly inaccurate as we're including the subscription 807 * list of vlan->lowerdev too. 808 * 809 * Bug alert: This only works if everyone has the same broadcast 810 * address as lowerdev. As soon as someone changes theirs this 811 * will break. 812 * 813 * However, this is already broken as when you change your broadcast 814 * address we don't get called. 815 * 816 * The solution is to maintain a list of broadcast addresses like 817 * we do for uc/mc, if you care. 818 */ 819 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); 820 } 821 822 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 823 { 824 struct macvlan_dev *vlan = netdev_priv(dev); 825 826 if (vlan->lowerdev->mtu < new_mtu) 827 return -EINVAL; 828 dev->mtu = new_mtu; 829 return 0; 830 } 831 832 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 833 { 834 struct net_device *real_dev = macvlan_dev_real_dev(dev); 835 const struct net_device_ops *ops = real_dev->netdev_ops; 836 struct ifreq ifrr; 837 int err = -EOPNOTSUPP; 838 839 strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 840 ifrr.ifr_ifru = ifr->ifr_ifru; 841 842 switch (cmd) { 843 case SIOCSHWTSTAMP: 844 if (!net_eq(dev_net(dev), &init_net)) 845 break; 846 fallthrough; 847 case SIOCGHWTSTAMP: 848 if (netif_device_present(real_dev) && ops->ndo_do_ioctl) 849 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd); 850 break; 851 } 852 853 if (!err) 854 ifr->ifr_ifru = ifrr.ifr_ifru; 855 856 return err; 857 } 858 859 /* 860 * macvlan network devices have devices nesting below it and are a special 861 * "super class" of normal network devices; split their locks off into a 862 * separate class since they always nest. 863 */ 864 static struct lock_class_key macvlan_netdev_addr_lock_key; 865 866 #define ALWAYS_ON_OFFLOADS \ 867 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ 868 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL) 869 870 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX) 871 872 #define MACVLAN_FEATURES \ 873 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 874 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \ 875 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 876 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 877 878 #define MACVLAN_STATE_MASK \ 879 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 880 881 static void macvlan_set_lockdep_class(struct net_device *dev) 882 { 883 netdev_lockdep_set_classes(dev); 884 lockdep_set_class(&dev->addr_list_lock, 885 &macvlan_netdev_addr_lock_key); 886 } 887 888 static int macvlan_init(struct net_device *dev) 889 { 890 struct macvlan_dev *vlan = netdev_priv(dev); 891 const struct net_device *lowerdev = vlan->lowerdev; 892 struct macvlan_port *port = vlan->port; 893 894 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 895 (lowerdev->state & MACVLAN_STATE_MASK); 896 dev->features = lowerdev->features & MACVLAN_FEATURES; 897 dev->features |= ALWAYS_ON_FEATURES; 898 dev->hw_features |= NETIF_F_LRO; 899 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 900 dev->vlan_features |= ALWAYS_ON_OFFLOADS; 901 dev->hw_enc_features |= dev->features; 902 dev->gso_max_size = lowerdev->gso_max_size; 903 dev->gso_max_segs = lowerdev->gso_max_segs; 904 dev->hard_header_len = lowerdev->hard_header_len; 905 macvlan_set_lockdep_class(dev); 906 907 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 908 if (!vlan->pcpu_stats) 909 return -ENOMEM; 910 911 port->count += 1; 912 913 return 0; 914 } 915 916 static void macvlan_uninit(struct net_device *dev) 917 { 918 struct macvlan_dev *vlan = netdev_priv(dev); 919 struct macvlan_port *port = vlan->port; 920 921 free_percpu(vlan->pcpu_stats); 922 923 macvlan_flush_sources(port, vlan); 924 port->count -= 1; 925 if (!port->count) 926 macvlan_port_destroy(port->dev); 927 } 928 929 static void macvlan_dev_get_stats64(struct net_device *dev, 930 struct rtnl_link_stats64 *stats) 931 { 932 struct macvlan_dev *vlan = netdev_priv(dev); 933 934 if (vlan->pcpu_stats) { 935 struct vlan_pcpu_stats *p; 936 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 937 u32 rx_errors = 0, tx_dropped = 0; 938 unsigned int start; 939 int i; 940 941 for_each_possible_cpu(i) { 942 p = per_cpu_ptr(vlan->pcpu_stats, i); 943 do { 944 start = u64_stats_fetch_begin_irq(&p->syncp); 945 rx_packets = p->rx_packets; 946 rx_bytes = p->rx_bytes; 947 rx_multicast = p->rx_multicast; 948 tx_packets = p->tx_packets; 949 tx_bytes = p->tx_bytes; 950 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 951 952 stats->rx_packets += rx_packets; 953 stats->rx_bytes += rx_bytes; 954 stats->multicast += rx_multicast; 955 stats->tx_packets += tx_packets; 956 stats->tx_bytes += tx_bytes; 957 /* rx_errors & tx_dropped are u32, updated 958 * without syncp protection. 959 */ 960 rx_errors += p->rx_errors; 961 tx_dropped += p->tx_dropped; 962 } 963 stats->rx_errors = rx_errors; 964 stats->rx_dropped = rx_errors; 965 stats->tx_dropped = tx_dropped; 966 } 967 } 968 969 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 970 __be16 proto, u16 vid) 971 { 972 struct macvlan_dev *vlan = netdev_priv(dev); 973 struct net_device *lowerdev = vlan->lowerdev; 974 975 return vlan_vid_add(lowerdev, proto, vid); 976 } 977 978 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 979 __be16 proto, u16 vid) 980 { 981 struct macvlan_dev *vlan = netdev_priv(dev); 982 struct net_device *lowerdev = vlan->lowerdev; 983 984 vlan_vid_del(lowerdev, proto, vid); 985 return 0; 986 } 987 988 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 989 struct net_device *dev, 990 const unsigned char *addr, u16 vid, 991 u16 flags, 992 struct netlink_ext_ack *extack) 993 { 994 struct macvlan_dev *vlan = netdev_priv(dev); 995 int err = -EINVAL; 996 997 /* Support unicast filter only on passthru devices. 998 * Multicast filter should be allowed on all devices. 999 */ 1000 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1001 return -EOPNOTSUPP; 1002 1003 if (flags & NLM_F_REPLACE) 1004 return -EOPNOTSUPP; 1005 1006 if (is_unicast_ether_addr(addr)) 1007 err = dev_uc_add_excl(dev, addr); 1008 else if (is_multicast_ether_addr(addr)) 1009 err = dev_mc_add_excl(dev, addr); 1010 1011 return err; 1012 } 1013 1014 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 1015 struct net_device *dev, 1016 const unsigned char *addr, u16 vid) 1017 { 1018 struct macvlan_dev *vlan = netdev_priv(dev); 1019 int err = -EINVAL; 1020 1021 /* Support unicast filter only on passthru devices. 1022 * Multicast filter should be allowed on all devices. 1023 */ 1024 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1025 return -EOPNOTSUPP; 1026 1027 if (is_unicast_ether_addr(addr)) 1028 err = dev_uc_del(dev, addr); 1029 else if (is_multicast_ether_addr(addr)) 1030 err = dev_mc_del(dev, addr); 1031 1032 return err; 1033 } 1034 1035 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 1036 struct ethtool_drvinfo *drvinfo) 1037 { 1038 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 1039 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 1040 } 1041 1042 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 1043 struct ethtool_link_ksettings *cmd) 1044 { 1045 const struct macvlan_dev *vlan = netdev_priv(dev); 1046 1047 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 1048 } 1049 1050 static int macvlan_ethtool_get_ts_info(struct net_device *dev, 1051 struct ethtool_ts_info *info) 1052 { 1053 struct net_device *real_dev = macvlan_dev_real_dev(dev); 1054 const struct ethtool_ops *ops = real_dev->ethtool_ops; 1055 struct phy_device *phydev = real_dev->phydev; 1056 1057 if (phy_has_tsinfo(phydev)) { 1058 return phy_ts_info(phydev, info); 1059 } else if (ops->get_ts_info) { 1060 return ops->get_ts_info(real_dev, info); 1061 } else { 1062 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 1063 SOF_TIMESTAMPING_SOFTWARE; 1064 info->phc_index = -1; 1065 } 1066 1067 return 0; 1068 } 1069 1070 static netdev_features_t macvlan_fix_features(struct net_device *dev, 1071 netdev_features_t features) 1072 { 1073 struct macvlan_dev *vlan = netdev_priv(dev); 1074 netdev_features_t lowerdev_features = vlan->lowerdev->features; 1075 netdev_features_t mask; 1076 1077 features |= NETIF_F_ALL_FOR_ALL; 1078 features &= (vlan->set_features | ~MACVLAN_FEATURES); 1079 mask = features; 1080 1081 lowerdev_features &= (features | ~NETIF_F_LRO); 1082 features = netdev_increment_features(lowerdev_features, features, mask); 1083 features |= ALWAYS_ON_FEATURES; 1084 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES); 1085 1086 return features; 1087 } 1088 1089 #ifdef CONFIG_NET_POLL_CONTROLLER 1090 static void macvlan_dev_poll_controller(struct net_device *dev) 1091 { 1092 return; 1093 } 1094 1095 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 1096 { 1097 struct macvlan_dev *vlan = netdev_priv(dev); 1098 struct net_device *real_dev = vlan->lowerdev; 1099 struct netpoll *netpoll; 1100 int err; 1101 1102 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 1103 err = -ENOMEM; 1104 if (!netpoll) 1105 goto out; 1106 1107 err = __netpoll_setup(netpoll, real_dev); 1108 if (err) { 1109 kfree(netpoll); 1110 goto out; 1111 } 1112 1113 vlan->netpoll = netpoll; 1114 1115 out: 1116 return err; 1117 } 1118 1119 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1120 { 1121 struct macvlan_dev *vlan = netdev_priv(dev); 1122 struct netpoll *netpoll = vlan->netpoll; 1123 1124 if (!netpoll) 1125 return; 1126 1127 vlan->netpoll = NULL; 1128 1129 __netpoll_free(netpoll); 1130 } 1131 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1132 1133 static int macvlan_dev_get_iflink(const struct net_device *dev) 1134 { 1135 struct macvlan_dev *vlan = netdev_priv(dev); 1136 1137 return vlan->lowerdev->ifindex; 1138 } 1139 1140 static const struct ethtool_ops macvlan_ethtool_ops = { 1141 .get_link = ethtool_op_get_link, 1142 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1143 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1144 .get_ts_info = macvlan_ethtool_get_ts_info, 1145 }; 1146 1147 static const struct net_device_ops macvlan_netdev_ops = { 1148 .ndo_init = macvlan_init, 1149 .ndo_uninit = macvlan_uninit, 1150 .ndo_open = macvlan_open, 1151 .ndo_stop = macvlan_stop, 1152 .ndo_start_xmit = macvlan_start_xmit, 1153 .ndo_change_mtu = macvlan_change_mtu, 1154 .ndo_do_ioctl = macvlan_do_ioctl, 1155 .ndo_fix_features = macvlan_fix_features, 1156 .ndo_change_rx_flags = macvlan_change_rx_flags, 1157 .ndo_set_mac_address = macvlan_set_mac_address, 1158 .ndo_set_rx_mode = macvlan_set_mac_lists, 1159 .ndo_get_stats64 = macvlan_dev_get_stats64, 1160 .ndo_validate_addr = eth_validate_addr, 1161 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1162 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1163 .ndo_fdb_add = macvlan_fdb_add, 1164 .ndo_fdb_del = macvlan_fdb_del, 1165 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1166 #ifdef CONFIG_NET_POLL_CONTROLLER 1167 .ndo_poll_controller = macvlan_dev_poll_controller, 1168 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1169 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1170 #endif 1171 .ndo_get_iflink = macvlan_dev_get_iflink, 1172 .ndo_features_check = passthru_features_check, 1173 .ndo_change_proto_down = dev_change_proto_down_generic, 1174 }; 1175 1176 void macvlan_common_setup(struct net_device *dev) 1177 { 1178 ether_setup(dev); 1179 1180 dev->min_mtu = 0; 1181 dev->max_mtu = ETH_MAX_MTU; 1182 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1183 netif_keep_dst(dev); 1184 dev->priv_flags |= IFF_UNICAST_FLT; 1185 dev->netdev_ops = &macvlan_netdev_ops; 1186 dev->needs_free_netdev = true; 1187 dev->header_ops = &macvlan_hard_header_ops; 1188 dev->ethtool_ops = &macvlan_ethtool_ops; 1189 } 1190 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1191 1192 static void macvlan_setup(struct net_device *dev) 1193 { 1194 macvlan_common_setup(dev); 1195 dev->priv_flags |= IFF_NO_QUEUE; 1196 } 1197 1198 static int macvlan_port_create(struct net_device *dev) 1199 { 1200 struct macvlan_port *port; 1201 unsigned int i; 1202 int err; 1203 1204 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1205 return -EINVAL; 1206 1207 if (netdev_is_rx_handler_busy(dev)) 1208 return -EBUSY; 1209 1210 port = kzalloc(sizeof(*port), GFP_KERNEL); 1211 if (port == NULL) 1212 return -ENOMEM; 1213 1214 port->dev = dev; 1215 ether_addr_copy(port->perm_addr, dev->dev_addr); 1216 INIT_LIST_HEAD(&port->vlans); 1217 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1218 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1219 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1220 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1221 1222 port->bc_queue_len_used = 0; 1223 skb_queue_head_init(&port->bc_queue); 1224 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1225 1226 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1227 if (err) 1228 kfree(port); 1229 else 1230 dev->priv_flags |= IFF_MACVLAN_PORT; 1231 return err; 1232 } 1233 1234 static void macvlan_port_destroy(struct net_device *dev) 1235 { 1236 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1237 struct sk_buff *skb; 1238 1239 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1240 netdev_rx_handler_unregister(dev); 1241 1242 /* After this point, no packet can schedule bc_work anymore, 1243 * but we need to cancel it and purge left skbs if any. 1244 */ 1245 cancel_work_sync(&port->bc_work); 1246 1247 while ((skb = __skb_dequeue(&port->bc_queue))) { 1248 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 1249 1250 if (src) 1251 dev_put(src->dev); 1252 1253 kfree_skb(skb); 1254 } 1255 1256 /* If the lower device address has been changed by passthru 1257 * macvlan, put it back. 1258 */ 1259 if (macvlan_passthru(port) && 1260 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { 1261 struct sockaddr sa; 1262 1263 sa.sa_family = port->dev->type; 1264 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len); 1265 dev_set_mac_address(port->dev, &sa, NULL); 1266 } 1267 1268 kfree(port); 1269 } 1270 1271 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[], 1272 struct netlink_ext_ack *extack) 1273 { 1274 struct nlattr *nla, *head; 1275 int rem, len; 1276 1277 if (tb[IFLA_ADDRESS]) { 1278 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1279 return -EINVAL; 1280 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1281 return -EADDRNOTAVAIL; 1282 } 1283 1284 if (!data) 1285 return 0; 1286 1287 if (data[IFLA_MACVLAN_FLAGS] && 1288 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC | 1289 MACVLAN_FLAG_NODST)) 1290 return -EINVAL; 1291 1292 if (data[IFLA_MACVLAN_MODE]) { 1293 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1294 case MACVLAN_MODE_PRIVATE: 1295 case MACVLAN_MODE_VEPA: 1296 case MACVLAN_MODE_BRIDGE: 1297 case MACVLAN_MODE_PASSTHRU: 1298 case MACVLAN_MODE_SOURCE: 1299 break; 1300 default: 1301 return -EINVAL; 1302 } 1303 } 1304 1305 if (data[IFLA_MACVLAN_MACADDR_MODE]) { 1306 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1307 case MACVLAN_MACADDR_ADD: 1308 case MACVLAN_MACADDR_DEL: 1309 case MACVLAN_MACADDR_FLUSH: 1310 case MACVLAN_MACADDR_SET: 1311 break; 1312 default: 1313 return -EINVAL; 1314 } 1315 } 1316 1317 if (data[IFLA_MACVLAN_MACADDR]) { 1318 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1319 return -EINVAL; 1320 1321 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1322 return -EADDRNOTAVAIL; 1323 } 1324 1325 if (data[IFLA_MACVLAN_MACADDR_DATA]) { 1326 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1327 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1328 1329 nla_for_each_attr(nla, head, len, rem) { 1330 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1331 nla_len(nla) != ETH_ALEN) 1332 return -EINVAL; 1333 1334 if (!is_valid_ether_addr(nla_data(nla))) 1335 return -EADDRNOTAVAIL; 1336 } 1337 } 1338 1339 if (data[IFLA_MACVLAN_MACADDR_COUNT]) 1340 return -EINVAL; 1341 1342 return 0; 1343 } 1344 1345 /* 1346 * reconfigure list of remote source mac address 1347 * (only for macvlan devices in source mode) 1348 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1349 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1350 */ 1351 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1352 struct nlattr *data[]) 1353 { 1354 char *addr = NULL; 1355 int ret, rem, len; 1356 struct nlattr *nla, *head; 1357 struct macvlan_source_entry *entry; 1358 1359 if (data[IFLA_MACVLAN_MACADDR]) 1360 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1361 1362 if (mode == MACVLAN_MACADDR_ADD) { 1363 if (!addr) 1364 return -EINVAL; 1365 1366 return macvlan_hash_add_source(vlan, addr); 1367 1368 } else if (mode == MACVLAN_MACADDR_DEL) { 1369 if (!addr) 1370 return -EINVAL; 1371 1372 entry = macvlan_hash_lookup_source(vlan, addr); 1373 if (entry) { 1374 macvlan_hash_del_source(entry); 1375 vlan->macaddr_count--; 1376 } 1377 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1378 macvlan_flush_sources(vlan->port, vlan); 1379 } else if (mode == MACVLAN_MACADDR_SET) { 1380 macvlan_flush_sources(vlan->port, vlan); 1381 1382 if (addr) { 1383 ret = macvlan_hash_add_source(vlan, addr); 1384 if (ret) 1385 return ret; 1386 } 1387 1388 if (!data[IFLA_MACVLAN_MACADDR_DATA]) 1389 return 0; 1390 1391 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1392 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1393 1394 nla_for_each_attr(nla, head, len, rem) { 1395 addr = nla_data(nla); 1396 ret = macvlan_hash_add_source(vlan, addr); 1397 if (ret) 1398 return ret; 1399 } 1400 } else { 1401 return -EINVAL; 1402 } 1403 1404 return 0; 1405 } 1406 1407 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1408 struct nlattr *tb[], struct nlattr *data[], 1409 struct netlink_ext_ack *extack) 1410 { 1411 struct macvlan_dev *vlan = netdev_priv(dev); 1412 struct macvlan_port *port; 1413 struct net_device *lowerdev; 1414 int err; 1415 int macmode; 1416 bool create = false; 1417 1418 if (!tb[IFLA_LINK]) 1419 return -EINVAL; 1420 1421 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1422 if (lowerdev == NULL) 1423 return -ENODEV; 1424 1425 /* When creating macvlans or macvtaps on top of other macvlans - use 1426 * the real device as the lowerdev. 1427 */ 1428 if (netif_is_macvlan(lowerdev)) 1429 lowerdev = macvlan_dev_real_dev(lowerdev); 1430 1431 if (!tb[IFLA_MTU]) 1432 dev->mtu = lowerdev->mtu; 1433 else if (dev->mtu > lowerdev->mtu) 1434 return -EINVAL; 1435 1436 /* MTU range: 68 - lowerdev->max_mtu */ 1437 dev->min_mtu = ETH_MIN_MTU; 1438 dev->max_mtu = lowerdev->max_mtu; 1439 1440 if (!tb[IFLA_ADDRESS]) 1441 eth_hw_addr_random(dev); 1442 1443 if (!netif_is_macvlan_port(lowerdev)) { 1444 err = macvlan_port_create(lowerdev); 1445 if (err < 0) 1446 return err; 1447 create = true; 1448 } 1449 port = macvlan_port_get_rtnl(lowerdev); 1450 1451 /* Only 1 macvlan device can be created in passthru mode */ 1452 if (macvlan_passthru(port)) { 1453 /* The macvlan port must be not created this time, 1454 * still goto destroy_macvlan_port for readability. 1455 */ 1456 err = -EINVAL; 1457 goto destroy_macvlan_port; 1458 } 1459 1460 vlan->lowerdev = lowerdev; 1461 vlan->dev = dev; 1462 vlan->port = port; 1463 vlan->set_features = MACVLAN_FEATURES; 1464 1465 vlan->mode = MACVLAN_MODE_VEPA; 1466 if (data && data[IFLA_MACVLAN_MODE]) 1467 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1468 1469 if (data && data[IFLA_MACVLAN_FLAGS]) 1470 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1471 1472 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1473 if (port->count) { 1474 err = -EINVAL; 1475 goto destroy_macvlan_port; 1476 } 1477 macvlan_set_passthru(port); 1478 eth_hw_addr_inherit(dev, lowerdev); 1479 } 1480 1481 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1482 if (vlan->mode != MACVLAN_MODE_SOURCE) { 1483 err = -EINVAL; 1484 goto destroy_macvlan_port; 1485 } 1486 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1487 err = macvlan_changelink_sources(vlan, macmode, data); 1488 if (err) 1489 goto destroy_macvlan_port; 1490 } 1491 1492 vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN; 1493 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) 1494 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]); 1495 1496 err = register_netdevice(dev); 1497 if (err < 0) 1498 goto destroy_macvlan_port; 1499 1500 dev->priv_flags |= IFF_MACVLAN; 1501 err = netdev_upper_dev_link(lowerdev, dev, extack); 1502 if (err) 1503 goto unregister_netdev; 1504 1505 list_add_tail_rcu(&vlan->list, &port->vlans); 1506 update_port_bc_queue_len(vlan->port); 1507 netif_stacked_transfer_operstate(lowerdev, dev); 1508 linkwatch_fire_event(dev); 1509 1510 return 0; 1511 1512 unregister_netdev: 1513 /* macvlan_uninit would free the macvlan port */ 1514 unregister_netdevice(dev); 1515 return err; 1516 destroy_macvlan_port: 1517 /* the macvlan port may be freed by macvlan_uninit when fail to register. 1518 * so we destroy the macvlan port only when it's valid. 1519 */ 1520 if (create && macvlan_port_get_rtnl(lowerdev)) 1521 macvlan_port_destroy(port->dev); 1522 return err; 1523 } 1524 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1525 1526 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1527 struct nlattr *tb[], struct nlattr *data[], 1528 struct netlink_ext_ack *extack) 1529 { 1530 return macvlan_common_newlink(src_net, dev, tb, data, extack); 1531 } 1532 1533 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1534 { 1535 struct macvlan_dev *vlan = netdev_priv(dev); 1536 1537 if (vlan->mode == MACVLAN_MODE_SOURCE) 1538 macvlan_flush_sources(vlan->port, vlan); 1539 list_del_rcu(&vlan->list); 1540 update_port_bc_queue_len(vlan->port); 1541 unregister_netdevice_queue(dev, head); 1542 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1543 } 1544 EXPORT_SYMBOL_GPL(macvlan_dellink); 1545 1546 static int macvlan_changelink(struct net_device *dev, 1547 struct nlattr *tb[], struct nlattr *data[], 1548 struct netlink_ext_ack *extack) 1549 { 1550 struct macvlan_dev *vlan = netdev_priv(dev); 1551 enum macvlan_mode mode; 1552 bool set_mode = false; 1553 enum macvlan_macaddr_mode macmode; 1554 int ret; 1555 1556 /* Validate mode, but don't set yet: setting flags may fail. */ 1557 if (data && data[IFLA_MACVLAN_MODE]) { 1558 set_mode = true; 1559 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1560 /* Passthrough mode can't be set or cleared dynamically */ 1561 if ((mode == MACVLAN_MODE_PASSTHRU) != 1562 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1563 return -EINVAL; 1564 if (vlan->mode == MACVLAN_MODE_SOURCE && 1565 vlan->mode != mode) 1566 macvlan_flush_sources(vlan->port, vlan); 1567 } 1568 1569 if (data && data[IFLA_MACVLAN_FLAGS]) { 1570 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1571 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1572 if (macvlan_passthru(vlan->port) && promisc) { 1573 int err; 1574 1575 if (flags & MACVLAN_FLAG_NOPROMISC) 1576 err = dev_set_promiscuity(vlan->lowerdev, -1); 1577 else 1578 err = dev_set_promiscuity(vlan->lowerdev, 1); 1579 if (err < 0) 1580 return err; 1581 } 1582 vlan->flags = flags; 1583 } 1584 1585 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) { 1586 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]); 1587 update_port_bc_queue_len(vlan->port); 1588 } 1589 1590 if (set_mode) 1591 vlan->mode = mode; 1592 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1593 if (vlan->mode != MACVLAN_MODE_SOURCE) 1594 return -EINVAL; 1595 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1596 ret = macvlan_changelink_sources(vlan, macmode, data); 1597 if (ret) 1598 return ret; 1599 } 1600 return 0; 1601 } 1602 1603 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1604 { 1605 if (vlan->macaddr_count == 0) 1606 return 0; 1607 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1608 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1609 } 1610 1611 static size_t macvlan_get_size(const struct net_device *dev) 1612 { 1613 struct macvlan_dev *vlan = netdev_priv(dev); 1614 1615 return (0 1616 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1617 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1618 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1619 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1620 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */ 1621 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */ 1622 ); 1623 } 1624 1625 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1626 const struct macvlan_dev *vlan, 1627 const int i) 1628 { 1629 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1630 struct macvlan_source_entry *entry; 1631 1632 hlist_for_each_entry_rcu(entry, h, hlist) { 1633 if (entry->vlan != vlan) 1634 continue; 1635 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1636 return 1; 1637 } 1638 return 0; 1639 } 1640 1641 static int macvlan_fill_info(struct sk_buff *skb, 1642 const struct net_device *dev) 1643 { 1644 struct macvlan_dev *vlan = netdev_priv(dev); 1645 struct macvlan_port *port = vlan->port; 1646 int i; 1647 struct nlattr *nest; 1648 1649 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1650 goto nla_put_failure; 1651 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1652 goto nla_put_failure; 1653 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1654 goto nla_put_failure; 1655 if (vlan->macaddr_count > 0) { 1656 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA); 1657 if (nest == NULL) 1658 goto nla_put_failure; 1659 1660 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1661 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1662 goto nla_put_failure; 1663 } 1664 nla_nest_end(skb, nest); 1665 } 1666 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req)) 1667 goto nla_put_failure; 1668 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used)) 1669 goto nla_put_failure; 1670 return 0; 1671 1672 nla_put_failure: 1673 return -EMSGSIZE; 1674 } 1675 1676 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1677 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1678 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1679 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1680 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1681 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1682 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1683 [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 }, 1684 [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT }, 1685 }; 1686 1687 int macvlan_link_register(struct rtnl_link_ops *ops) 1688 { 1689 /* common fields */ 1690 ops->validate = macvlan_validate; 1691 ops->maxtype = IFLA_MACVLAN_MAX; 1692 ops->policy = macvlan_policy; 1693 ops->changelink = macvlan_changelink; 1694 ops->get_size = macvlan_get_size; 1695 ops->fill_info = macvlan_fill_info; 1696 1697 return rtnl_link_register(ops); 1698 }; 1699 EXPORT_SYMBOL_GPL(macvlan_link_register); 1700 1701 static struct net *macvlan_get_link_net(const struct net_device *dev) 1702 { 1703 return dev_net(macvlan_dev_real_dev(dev)); 1704 } 1705 1706 static struct rtnl_link_ops macvlan_link_ops = { 1707 .kind = "macvlan", 1708 .setup = macvlan_setup, 1709 .newlink = macvlan_newlink, 1710 .dellink = macvlan_dellink, 1711 .get_link_net = macvlan_get_link_net, 1712 .priv_size = sizeof(struct macvlan_dev), 1713 }; 1714 1715 static void update_port_bc_queue_len(struct macvlan_port *port) 1716 { 1717 u32 max_bc_queue_len_req = 0; 1718 struct macvlan_dev *vlan; 1719 1720 list_for_each_entry(vlan, &port->vlans, list) { 1721 if (vlan->bc_queue_len_req > max_bc_queue_len_req) 1722 max_bc_queue_len_req = vlan->bc_queue_len_req; 1723 } 1724 port->bc_queue_len_used = max_bc_queue_len_req; 1725 } 1726 1727 static int macvlan_device_event(struct notifier_block *unused, 1728 unsigned long event, void *ptr) 1729 { 1730 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1731 struct macvlan_dev *vlan, *next; 1732 struct macvlan_port *port; 1733 LIST_HEAD(list_kill); 1734 1735 if (!netif_is_macvlan_port(dev)) 1736 return NOTIFY_DONE; 1737 1738 port = macvlan_port_get_rtnl(dev); 1739 1740 switch (event) { 1741 case NETDEV_UP: 1742 case NETDEV_DOWN: 1743 case NETDEV_CHANGE: 1744 list_for_each_entry(vlan, &port->vlans, list) 1745 netif_stacked_transfer_operstate(vlan->lowerdev, 1746 vlan->dev); 1747 break; 1748 case NETDEV_FEAT_CHANGE: 1749 list_for_each_entry(vlan, &port->vlans, list) { 1750 vlan->dev->gso_max_size = dev->gso_max_size; 1751 vlan->dev->gso_max_segs = dev->gso_max_segs; 1752 netdev_update_features(vlan->dev); 1753 } 1754 break; 1755 case NETDEV_CHANGEMTU: 1756 list_for_each_entry(vlan, &port->vlans, list) { 1757 if (vlan->dev->mtu <= dev->mtu) 1758 continue; 1759 dev_set_mtu(vlan->dev, dev->mtu); 1760 } 1761 break; 1762 case NETDEV_CHANGEADDR: 1763 if (!macvlan_passthru(port)) 1764 return NOTIFY_DONE; 1765 1766 vlan = list_first_entry_or_null(&port->vlans, 1767 struct macvlan_dev, 1768 list); 1769 1770 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr)) 1771 return NOTIFY_BAD; 1772 1773 break; 1774 case NETDEV_UNREGISTER: 1775 /* twiddle thumbs on netns device moves */ 1776 if (dev->reg_state != NETREG_UNREGISTERING) 1777 break; 1778 1779 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1780 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1781 unregister_netdevice_many(&list_kill); 1782 break; 1783 case NETDEV_PRE_TYPE_CHANGE: 1784 /* Forbid underlying device to change its type. */ 1785 return NOTIFY_BAD; 1786 1787 case NETDEV_NOTIFY_PEERS: 1788 case NETDEV_BONDING_FAILOVER: 1789 case NETDEV_RESEND_IGMP: 1790 /* Propagate to all vlans */ 1791 list_for_each_entry(vlan, &port->vlans, list) 1792 call_netdevice_notifiers(event, vlan->dev); 1793 } 1794 return NOTIFY_DONE; 1795 } 1796 1797 static struct notifier_block macvlan_notifier_block __read_mostly = { 1798 .notifier_call = macvlan_device_event, 1799 }; 1800 1801 static int __init macvlan_init_module(void) 1802 { 1803 int err; 1804 1805 register_netdevice_notifier(&macvlan_notifier_block); 1806 1807 err = macvlan_link_register(&macvlan_link_ops); 1808 if (err < 0) 1809 goto err1; 1810 return 0; 1811 err1: 1812 unregister_netdevice_notifier(&macvlan_notifier_block); 1813 return err; 1814 } 1815 1816 static void __exit macvlan_cleanup_module(void) 1817 { 1818 rtnl_link_unregister(&macvlan_link_ops); 1819 unregister_netdevice_notifier(&macvlan_notifier_block); 1820 } 1821 1822 module_init(macvlan_init_module); 1823 module_exit(macvlan_cleanup_module); 1824 1825 MODULE_LICENSE("GPL"); 1826 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1827 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1828 MODULE_ALIAS_RTNL_LINK("macvlan"); 1829