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_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 flags; 50 int count; 51 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE]; 52 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ); 53 unsigned char perm_addr[ETH_ALEN]; 54 }; 55 56 struct macvlan_source_entry { 57 struct hlist_node hlist; 58 struct macvlan_dev *vlan; 59 unsigned char addr[6+2] __aligned(sizeof(u16)); 60 struct rcu_head rcu; 61 }; 62 63 struct macvlan_skb_cb { 64 const struct macvlan_dev *src; 65 }; 66 67 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 68 69 static void macvlan_port_destroy(struct net_device *dev); 70 71 static inline bool macvlan_passthru(const struct macvlan_port *port) 72 { 73 return port->flags & MACVLAN_F_PASSTHRU; 74 } 75 76 static inline void macvlan_set_passthru(struct macvlan_port *port) 77 { 78 port->flags |= MACVLAN_F_PASSTHRU; 79 } 80 81 static inline bool macvlan_addr_change(const struct macvlan_port *port) 82 { 83 return port->flags & MACVLAN_F_ADDRCHANGE; 84 } 85 86 static inline void macvlan_set_addr_change(struct macvlan_port *port) 87 { 88 port->flags |= MACVLAN_F_ADDRCHANGE; 89 } 90 91 static inline void macvlan_clear_addr_change(struct macvlan_port *port) 92 { 93 port->flags &= ~MACVLAN_F_ADDRCHANGE; 94 } 95 96 /* Hash Ethernet address */ 97 static u32 macvlan_eth_hash(const unsigned char *addr) 98 { 99 u64 value = get_unaligned((u64 *)addr); 100 101 /* only want 6 bytes */ 102 #ifdef __BIG_ENDIAN 103 value >>= 16; 104 #else 105 value <<= 16; 106 #endif 107 return hash_64(value, MACVLAN_HASH_BITS); 108 } 109 110 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 111 { 112 return rcu_dereference(dev->rx_handler_data); 113 } 114 115 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 116 { 117 return rtnl_dereference(dev->rx_handler_data); 118 } 119 120 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 121 const unsigned char *addr) 122 { 123 struct macvlan_dev *vlan; 124 u32 idx = macvlan_eth_hash(addr); 125 126 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) { 127 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 128 return vlan; 129 } 130 return NULL; 131 } 132 133 static struct macvlan_source_entry *macvlan_hash_lookup_source( 134 const struct macvlan_dev *vlan, 135 const unsigned char *addr) 136 { 137 struct macvlan_source_entry *entry; 138 u32 idx = macvlan_eth_hash(addr); 139 struct hlist_head *h = &vlan->port->vlan_source_hash[idx]; 140 141 hlist_for_each_entry_rcu(entry, h, hlist) { 142 if (ether_addr_equal_64bits(entry->addr, addr) && 143 entry->vlan == vlan) 144 return entry; 145 } 146 return NULL; 147 } 148 149 static int macvlan_hash_add_source(struct macvlan_dev *vlan, 150 const unsigned char *addr) 151 { 152 struct macvlan_port *port = vlan->port; 153 struct macvlan_source_entry *entry; 154 struct hlist_head *h; 155 156 entry = macvlan_hash_lookup_source(vlan, addr); 157 if (entry) 158 return 0; 159 160 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 161 if (!entry) 162 return -ENOMEM; 163 164 ether_addr_copy(entry->addr, addr); 165 entry->vlan = vlan; 166 h = &port->vlan_source_hash[macvlan_eth_hash(addr)]; 167 hlist_add_head_rcu(&entry->hlist, h); 168 vlan->macaddr_count++; 169 170 return 0; 171 } 172 173 static void macvlan_hash_add(struct macvlan_dev *vlan) 174 { 175 struct macvlan_port *port = vlan->port; 176 const unsigned char *addr = vlan->dev->dev_addr; 177 u32 idx = macvlan_eth_hash(addr); 178 179 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]); 180 } 181 182 static void macvlan_hash_del_source(struct macvlan_source_entry *entry) 183 { 184 hlist_del_rcu(&entry->hlist); 185 kfree_rcu(entry, rcu); 186 } 187 188 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 189 { 190 hlist_del_rcu(&vlan->hlist); 191 if (sync) 192 synchronize_rcu(); 193 } 194 195 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 196 const unsigned char *addr) 197 { 198 macvlan_hash_del(vlan, true); 199 /* Now that we are unhashed it is safe to change the device 200 * address without confusing packet delivery. 201 */ 202 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 203 macvlan_hash_add(vlan); 204 } 205 206 static bool macvlan_addr_busy(const struct macvlan_port *port, 207 const unsigned char *addr) 208 { 209 /* Test to see if the specified address is 210 * currently in use by the underlying device or 211 * another macvlan. 212 */ 213 if (!macvlan_passthru(port) && !macvlan_addr_change(port) && 214 ether_addr_equal_64bits(port->dev->dev_addr, addr)) 215 return true; 216 217 if (macvlan_hash_lookup(port, addr)) 218 return true; 219 220 return false; 221 } 222 223 224 static int macvlan_broadcast_one(struct sk_buff *skb, 225 const struct macvlan_dev *vlan, 226 const struct ethhdr *eth, bool local) 227 { 228 struct net_device *dev = vlan->dev; 229 230 if (local) 231 return __dev_forward_skb(dev, skb); 232 233 skb->dev = dev; 234 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 235 skb->pkt_type = PACKET_BROADCAST; 236 else 237 skb->pkt_type = PACKET_MULTICAST; 238 239 return 0; 240 } 241 242 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 243 { 244 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 245 } 246 247 248 static unsigned int mc_hash(const struct macvlan_dev *vlan, 249 const unsigned char *addr) 250 { 251 u32 val = __get_unaligned_cpu32(addr + 2); 252 253 val ^= macvlan_hash_mix(vlan); 254 return hash_32(val, MACVLAN_MC_FILTER_BITS); 255 } 256 257 static void macvlan_broadcast(struct sk_buff *skb, 258 const struct macvlan_port *port, 259 struct net_device *src, 260 enum macvlan_mode mode) 261 { 262 const struct ethhdr *eth = eth_hdr(skb); 263 const struct macvlan_dev *vlan; 264 struct sk_buff *nskb; 265 unsigned int i; 266 int err; 267 unsigned int hash; 268 269 if (skb->protocol == htons(ETH_P_PAUSE)) 270 return; 271 272 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 273 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 274 if (vlan->dev == src || !(vlan->mode & mode)) 275 continue; 276 277 hash = mc_hash(vlan, eth->h_dest); 278 if (!test_bit(hash, vlan->mc_filter)) 279 continue; 280 281 err = NET_RX_DROP; 282 nskb = skb_clone(skb, GFP_ATOMIC); 283 if (likely(nskb)) 284 err = macvlan_broadcast_one( 285 nskb, vlan, eth, 286 mode == MACVLAN_MODE_BRIDGE) ?: 287 netif_rx_ni(nskb); 288 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 289 err == NET_RX_SUCCESS, true); 290 } 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) < MACVLAN_BC_QUEUE_LEN) { 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 int i; 381 382 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 383 struct hlist_node *h, *n; 384 385 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) { 386 struct macvlan_source_entry *entry; 387 388 entry = hlist_entry(h, struct macvlan_source_entry, 389 hlist); 390 if (entry->vlan == vlan) 391 macvlan_hash_del_source(entry); 392 } 393 } 394 vlan->macaddr_count = 0; 395 } 396 397 static void macvlan_forward_source_one(struct sk_buff *skb, 398 struct macvlan_dev *vlan) 399 { 400 struct sk_buff *nskb; 401 struct net_device *dev; 402 int len; 403 int ret; 404 405 dev = vlan->dev; 406 if (unlikely(!(dev->flags & IFF_UP))) 407 return; 408 409 nskb = skb_clone(skb, GFP_ATOMIC); 410 if (!nskb) 411 return; 412 413 len = nskb->len + ETH_HLEN; 414 nskb->dev = dev; 415 416 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr)) 417 nskb->pkt_type = PACKET_HOST; 418 419 ret = netif_rx(nskb); 420 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 421 } 422 423 static void macvlan_forward_source(struct sk_buff *skb, 424 struct macvlan_port *port, 425 const unsigned char *addr) 426 { 427 struct macvlan_source_entry *entry; 428 u32 idx = macvlan_eth_hash(addr); 429 struct hlist_head *h = &port->vlan_source_hash[idx]; 430 431 hlist_for_each_entry_rcu(entry, h, hlist) { 432 if (ether_addr_equal_64bits(entry->addr, addr)) 433 macvlan_forward_source_one(skb, entry->vlan); 434 } 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 port = macvlan_port_get_rcu(skb->dev); 451 if (is_multicast_ether_addr(eth->h_dest)) { 452 unsigned int hash; 453 454 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); 455 if (!skb) 456 return RX_HANDLER_CONSUMED; 457 *pskb = skb; 458 eth = eth_hdr(skb); 459 macvlan_forward_source(skb, port, eth->h_source); 460 src = macvlan_hash_lookup(port, eth->h_source); 461 if (src && src->mode != MACVLAN_MODE_VEPA && 462 src->mode != MACVLAN_MODE_BRIDGE) { 463 /* forward to original port. */ 464 vlan = src; 465 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 466 netif_rx(skb); 467 handle_res = RX_HANDLER_CONSUMED; 468 goto out; 469 } 470 471 hash = mc_hash(NULL, eth->h_dest); 472 if (test_bit(hash, port->mc_filter)) 473 macvlan_broadcast_enqueue(port, src, skb); 474 475 return RX_HANDLER_PASS; 476 } 477 478 macvlan_forward_source(skb, port, eth->h_source); 479 if (macvlan_passthru(port)) 480 vlan = list_first_or_null_rcu(&port->vlans, 481 struct macvlan_dev, list); 482 else 483 vlan = macvlan_hash_lookup(port, eth->h_dest); 484 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE) 485 return RX_HANDLER_PASS; 486 487 dev = vlan->dev; 488 if (unlikely(!(dev->flags & IFF_UP))) { 489 kfree_skb(skb); 490 return RX_HANDLER_CONSUMED; 491 } 492 len = skb->len + ETH_HLEN; 493 skb = skb_share_check(skb, GFP_ATOMIC); 494 if (!skb) { 495 ret = NET_RX_DROP; 496 handle_res = RX_HANDLER_CONSUMED; 497 goto out; 498 } 499 500 *pskb = skb; 501 skb->dev = dev; 502 skb->pkt_type = PACKET_HOST; 503 504 ret = NET_RX_SUCCESS; 505 handle_res = RX_HANDLER_ANOTHER; 506 out: 507 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 508 return handle_res; 509 } 510 511 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 512 { 513 const struct macvlan_dev *vlan = netdev_priv(dev); 514 const struct macvlan_port *port = vlan->port; 515 const struct macvlan_dev *dest; 516 517 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 518 const struct ethhdr *eth = skb_eth_hdr(skb); 519 520 /* send to other bridge ports directly */ 521 if (is_multicast_ether_addr(eth->h_dest)) { 522 skb_reset_mac_header(skb); 523 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 524 goto xmit_world; 525 } 526 527 dest = macvlan_hash_lookup(port, eth->h_dest); 528 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 529 /* send to lowerdev first for its network taps */ 530 dev_forward_skb(vlan->lowerdev, skb); 531 532 return NET_XMIT_SUCCESS; 533 } 534 } 535 xmit_world: 536 skb->dev = vlan->lowerdev; 537 return dev_queue_xmit_accel(skb, 538 netdev_get_sb_channel(dev) ? dev : NULL); 539 } 540 541 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 542 { 543 #ifdef CONFIG_NET_POLL_CONTROLLER 544 if (vlan->netpoll) 545 netpoll_send_skb(vlan->netpoll, skb); 546 #else 547 BUG(); 548 #endif 549 return NETDEV_TX_OK; 550 } 551 552 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 553 struct net_device *dev) 554 { 555 struct macvlan_dev *vlan = netdev_priv(dev); 556 unsigned int len = skb->len; 557 int ret; 558 559 if (unlikely(netpoll_tx_running(dev))) 560 return macvlan_netpoll_send_skb(vlan, skb); 561 562 ret = macvlan_queue_xmit(skb, dev); 563 564 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 565 struct vlan_pcpu_stats *pcpu_stats; 566 567 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 568 u64_stats_update_begin(&pcpu_stats->syncp); 569 pcpu_stats->tx_packets++; 570 pcpu_stats->tx_bytes += len; 571 u64_stats_update_end(&pcpu_stats->syncp); 572 } else { 573 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 574 } 575 return ret; 576 } 577 578 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 579 unsigned short type, const void *daddr, 580 const void *saddr, unsigned len) 581 { 582 const struct macvlan_dev *vlan = netdev_priv(dev); 583 struct net_device *lowerdev = vlan->lowerdev; 584 585 return dev_hard_header(skb, lowerdev, type, daddr, 586 saddr ? : dev->dev_addr, len); 587 } 588 589 static const struct header_ops macvlan_hard_header_ops = { 590 .create = macvlan_hard_header, 591 .parse = eth_header_parse, 592 .cache = eth_header_cache, 593 .cache_update = eth_header_cache_update, 594 }; 595 596 static int macvlan_open(struct net_device *dev) 597 { 598 struct macvlan_dev *vlan = netdev_priv(dev); 599 struct net_device *lowerdev = vlan->lowerdev; 600 int err; 601 602 if (macvlan_passthru(vlan->port)) { 603 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 604 err = dev_set_promiscuity(lowerdev, 1); 605 if (err < 0) 606 goto out; 607 } 608 goto hash_add; 609 } 610 611 err = -EADDRINUSE; 612 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 613 goto out; 614 615 /* Attempt to populate accel_priv which is used to offload the L2 616 * forwarding requests for unicast packets. 617 */ 618 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) 619 vlan->accel_priv = 620 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 621 622 /* If earlier attempt to offload failed, or accel_priv is not 623 * populated we must add the unicast address to the lower device. 624 */ 625 if (IS_ERR_OR_NULL(vlan->accel_priv)) { 626 vlan->accel_priv = NULL; 627 err = dev_uc_add(lowerdev, dev->dev_addr); 628 if (err < 0) 629 goto out; 630 } 631 632 if (dev->flags & IFF_ALLMULTI) { 633 err = dev_set_allmulti(lowerdev, 1); 634 if (err < 0) 635 goto del_unicast; 636 } 637 638 if (dev->flags & IFF_PROMISC) { 639 err = dev_set_promiscuity(lowerdev, 1); 640 if (err < 0) 641 goto clear_multi; 642 } 643 644 hash_add: 645 macvlan_hash_add(vlan); 646 return 0; 647 648 clear_multi: 649 if (dev->flags & IFF_ALLMULTI) 650 dev_set_allmulti(lowerdev, -1); 651 del_unicast: 652 if (vlan->accel_priv) { 653 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 654 vlan->accel_priv); 655 vlan->accel_priv = NULL; 656 } else { 657 dev_uc_del(lowerdev, dev->dev_addr); 658 } 659 out: 660 return err; 661 } 662 663 static int macvlan_stop(struct net_device *dev) 664 { 665 struct macvlan_dev *vlan = netdev_priv(dev); 666 struct net_device *lowerdev = vlan->lowerdev; 667 668 if (vlan->accel_priv) { 669 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 670 vlan->accel_priv); 671 vlan->accel_priv = NULL; 672 } 673 674 dev_uc_unsync(lowerdev, dev); 675 dev_mc_unsync(lowerdev, dev); 676 677 if (macvlan_passthru(vlan->port)) { 678 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 679 dev_set_promiscuity(lowerdev, -1); 680 goto hash_del; 681 } 682 683 if (dev->flags & IFF_ALLMULTI) 684 dev_set_allmulti(lowerdev, -1); 685 686 if (dev->flags & IFF_PROMISC) 687 dev_set_promiscuity(lowerdev, -1); 688 689 dev_uc_del(lowerdev, dev->dev_addr); 690 691 hash_del: 692 macvlan_hash_del(vlan, !dev->dismantle); 693 return 0; 694 } 695 696 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 697 { 698 struct macvlan_dev *vlan = netdev_priv(dev); 699 struct net_device *lowerdev = vlan->lowerdev; 700 struct macvlan_port *port = vlan->port; 701 int err; 702 703 if (!(dev->flags & IFF_UP)) { 704 /* Just copy in the new address */ 705 ether_addr_copy(dev->dev_addr, addr); 706 } else { 707 /* Rehash and update the device filters */ 708 if (macvlan_addr_busy(vlan->port, addr)) 709 return -EADDRINUSE; 710 711 if (!macvlan_passthru(port)) { 712 err = dev_uc_add(lowerdev, addr); 713 if (err) 714 return err; 715 716 dev_uc_del(lowerdev, dev->dev_addr); 717 } 718 719 macvlan_hash_change_addr(vlan, addr); 720 } 721 if (macvlan_passthru(port) && !macvlan_addr_change(port)) { 722 /* Since addr_change isn't set, we are here due to lower 723 * device change. Save the lower-dev address so we can 724 * restore it later. 725 */ 726 ether_addr_copy(vlan->port->perm_addr, 727 lowerdev->dev_addr); 728 } 729 macvlan_clear_addr_change(port); 730 return 0; 731 } 732 733 static int macvlan_set_mac_address(struct net_device *dev, void *p) 734 { 735 struct macvlan_dev *vlan = netdev_priv(dev); 736 struct sockaddr *addr = p; 737 738 if (!is_valid_ether_addr(addr->sa_data)) 739 return -EADDRNOTAVAIL; 740 741 /* If the addresses are the same, this is a no-op */ 742 if (ether_addr_equal(dev->dev_addr, addr->sa_data)) 743 return 0; 744 745 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 746 macvlan_set_addr_change(vlan->port); 747 return dev_set_mac_address(vlan->lowerdev, addr, NULL); 748 } 749 750 if (macvlan_addr_busy(vlan->port, addr->sa_data)) 751 return -EADDRINUSE; 752 753 return macvlan_sync_address(dev, addr->sa_data); 754 } 755 756 static void macvlan_change_rx_flags(struct net_device *dev, int change) 757 { 758 struct macvlan_dev *vlan = netdev_priv(dev); 759 struct net_device *lowerdev = vlan->lowerdev; 760 761 if (dev->flags & IFF_UP) { 762 if (change & IFF_ALLMULTI) 763 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 764 if (change & IFF_PROMISC) 765 dev_set_promiscuity(lowerdev, 766 dev->flags & IFF_PROMISC ? 1 : -1); 767 768 } 769 } 770 771 static void macvlan_compute_filter(unsigned long *mc_filter, 772 struct net_device *dev, 773 struct macvlan_dev *vlan) 774 { 775 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 776 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 777 } else { 778 struct netdev_hw_addr *ha; 779 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 780 781 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 782 netdev_for_each_mc_addr(ha, dev) { 783 __set_bit(mc_hash(vlan, ha->addr), filter); 784 } 785 786 __set_bit(mc_hash(vlan, dev->broadcast), filter); 787 788 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 789 } 790 } 791 792 static void macvlan_set_mac_lists(struct net_device *dev) 793 { 794 struct macvlan_dev *vlan = netdev_priv(dev); 795 796 macvlan_compute_filter(vlan->mc_filter, dev, vlan); 797 798 dev_uc_sync(vlan->lowerdev, dev); 799 dev_mc_sync(vlan->lowerdev, dev); 800 801 /* This is slightly inaccurate as we're including the subscription 802 * list of vlan->lowerdev too. 803 * 804 * Bug alert: This only works if everyone has the same broadcast 805 * address as lowerdev. As soon as someone changes theirs this 806 * will break. 807 * 808 * However, this is already broken as when you change your broadcast 809 * address we don't get called. 810 * 811 * The solution is to maintain a list of broadcast addresses like 812 * we do for uc/mc, if you care. 813 */ 814 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); 815 } 816 817 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 818 { 819 struct macvlan_dev *vlan = netdev_priv(dev); 820 821 if (vlan->lowerdev->mtu < new_mtu) 822 return -EINVAL; 823 dev->mtu = new_mtu; 824 return 0; 825 } 826 827 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 828 { 829 struct net_device *real_dev = macvlan_dev_real_dev(dev); 830 const struct net_device_ops *ops = real_dev->netdev_ops; 831 struct ifreq ifrr; 832 int err = -EOPNOTSUPP; 833 834 strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 835 ifrr.ifr_ifru = ifr->ifr_ifru; 836 837 switch (cmd) { 838 case SIOCSHWTSTAMP: 839 if (!net_eq(dev_net(dev), &init_net)) 840 break; 841 /* fall through */ 842 case SIOCGHWTSTAMP: 843 if (netif_device_present(real_dev) && ops->ndo_do_ioctl) 844 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd); 845 break; 846 } 847 848 if (!err) 849 ifr->ifr_ifru = ifrr.ifr_ifru; 850 851 return err; 852 } 853 854 /* 855 * macvlan network devices have devices nesting below it and are a special 856 * "super class" of normal network devices; split their locks off into a 857 * separate class since they always nest. 858 */ 859 #define ALWAYS_ON_OFFLOADS \ 860 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ 861 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL) 862 863 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX) 864 865 #define MACVLAN_FEATURES \ 866 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 867 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \ 868 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 869 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 870 871 #define MACVLAN_STATE_MASK \ 872 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 873 874 static int macvlan_init(struct net_device *dev) 875 { 876 struct macvlan_dev *vlan = netdev_priv(dev); 877 const struct net_device *lowerdev = vlan->lowerdev; 878 struct macvlan_port *port = vlan->port; 879 880 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 881 (lowerdev->state & MACVLAN_STATE_MASK); 882 dev->features = lowerdev->features & MACVLAN_FEATURES; 883 dev->features |= ALWAYS_ON_FEATURES; 884 dev->hw_features |= NETIF_F_LRO; 885 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 886 dev->vlan_features |= ALWAYS_ON_OFFLOADS; 887 dev->hw_enc_features |= dev->features; 888 dev->gso_max_size = lowerdev->gso_max_size; 889 dev->gso_max_segs = lowerdev->gso_max_segs; 890 dev->hard_header_len = lowerdev->hard_header_len; 891 892 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 893 if (!vlan->pcpu_stats) 894 return -ENOMEM; 895 896 port->count += 1; 897 898 return 0; 899 } 900 901 static void macvlan_uninit(struct net_device *dev) 902 { 903 struct macvlan_dev *vlan = netdev_priv(dev); 904 struct macvlan_port *port = vlan->port; 905 906 free_percpu(vlan->pcpu_stats); 907 908 macvlan_flush_sources(port, vlan); 909 port->count -= 1; 910 if (!port->count) 911 macvlan_port_destroy(port->dev); 912 } 913 914 static void macvlan_dev_get_stats64(struct net_device *dev, 915 struct rtnl_link_stats64 *stats) 916 { 917 struct macvlan_dev *vlan = netdev_priv(dev); 918 919 if (vlan->pcpu_stats) { 920 struct vlan_pcpu_stats *p; 921 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 922 u32 rx_errors = 0, tx_dropped = 0; 923 unsigned int start; 924 int i; 925 926 for_each_possible_cpu(i) { 927 p = per_cpu_ptr(vlan->pcpu_stats, i); 928 do { 929 start = u64_stats_fetch_begin_irq(&p->syncp); 930 rx_packets = p->rx_packets; 931 rx_bytes = p->rx_bytes; 932 rx_multicast = p->rx_multicast; 933 tx_packets = p->tx_packets; 934 tx_bytes = p->tx_bytes; 935 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 936 937 stats->rx_packets += rx_packets; 938 stats->rx_bytes += rx_bytes; 939 stats->multicast += rx_multicast; 940 stats->tx_packets += tx_packets; 941 stats->tx_bytes += tx_bytes; 942 /* rx_errors & tx_dropped are u32, updated 943 * without syncp protection. 944 */ 945 rx_errors += p->rx_errors; 946 tx_dropped += p->tx_dropped; 947 } 948 stats->rx_errors = rx_errors; 949 stats->rx_dropped = rx_errors; 950 stats->tx_dropped = tx_dropped; 951 } 952 } 953 954 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 955 __be16 proto, u16 vid) 956 { 957 struct macvlan_dev *vlan = netdev_priv(dev); 958 struct net_device *lowerdev = vlan->lowerdev; 959 960 return vlan_vid_add(lowerdev, proto, vid); 961 } 962 963 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 964 __be16 proto, u16 vid) 965 { 966 struct macvlan_dev *vlan = netdev_priv(dev); 967 struct net_device *lowerdev = vlan->lowerdev; 968 969 vlan_vid_del(lowerdev, proto, vid); 970 return 0; 971 } 972 973 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 974 struct net_device *dev, 975 const unsigned char *addr, u16 vid, 976 u16 flags, 977 struct netlink_ext_ack *extack) 978 { 979 struct macvlan_dev *vlan = netdev_priv(dev); 980 int err = -EINVAL; 981 982 /* Support unicast filter only on passthru devices. 983 * Multicast filter should be allowed on all devices. 984 */ 985 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 986 return -EOPNOTSUPP; 987 988 if (flags & NLM_F_REPLACE) 989 return -EOPNOTSUPP; 990 991 if (is_unicast_ether_addr(addr)) 992 err = dev_uc_add_excl(dev, addr); 993 else if (is_multicast_ether_addr(addr)) 994 err = dev_mc_add_excl(dev, addr); 995 996 return err; 997 } 998 999 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 1000 struct net_device *dev, 1001 const unsigned char *addr, u16 vid) 1002 { 1003 struct macvlan_dev *vlan = netdev_priv(dev); 1004 int err = -EINVAL; 1005 1006 /* Support unicast filter only on passthru devices. 1007 * Multicast filter should be allowed on all devices. 1008 */ 1009 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1010 return -EOPNOTSUPP; 1011 1012 if (is_unicast_ether_addr(addr)) 1013 err = dev_uc_del(dev, addr); 1014 else if (is_multicast_ether_addr(addr)) 1015 err = dev_mc_del(dev, addr); 1016 1017 return err; 1018 } 1019 1020 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 1021 struct ethtool_drvinfo *drvinfo) 1022 { 1023 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 1024 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 1025 } 1026 1027 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 1028 struct ethtool_link_ksettings *cmd) 1029 { 1030 const struct macvlan_dev *vlan = netdev_priv(dev); 1031 1032 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 1033 } 1034 1035 static int macvlan_ethtool_get_ts_info(struct net_device *dev, 1036 struct ethtool_ts_info *info) 1037 { 1038 struct net_device *real_dev = macvlan_dev_real_dev(dev); 1039 const struct ethtool_ops *ops = real_dev->ethtool_ops; 1040 struct phy_device *phydev = real_dev->phydev; 1041 1042 if (phy_has_tsinfo(phydev)) { 1043 return phy_ts_info(phydev, info); 1044 } else if (ops->get_ts_info) { 1045 return ops->get_ts_info(real_dev, info); 1046 } else { 1047 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 1048 SOF_TIMESTAMPING_SOFTWARE; 1049 info->phc_index = -1; 1050 } 1051 1052 return 0; 1053 } 1054 1055 static netdev_features_t macvlan_fix_features(struct net_device *dev, 1056 netdev_features_t features) 1057 { 1058 struct macvlan_dev *vlan = netdev_priv(dev); 1059 netdev_features_t lowerdev_features = vlan->lowerdev->features; 1060 netdev_features_t mask; 1061 1062 features |= NETIF_F_ALL_FOR_ALL; 1063 features &= (vlan->set_features | ~MACVLAN_FEATURES); 1064 mask = features; 1065 1066 lowerdev_features &= (features | ~NETIF_F_LRO); 1067 features = netdev_increment_features(lowerdev_features, features, mask); 1068 features |= ALWAYS_ON_FEATURES; 1069 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES); 1070 1071 return features; 1072 } 1073 1074 #ifdef CONFIG_NET_POLL_CONTROLLER 1075 static void macvlan_dev_poll_controller(struct net_device *dev) 1076 { 1077 return; 1078 } 1079 1080 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 1081 { 1082 struct macvlan_dev *vlan = netdev_priv(dev); 1083 struct net_device *real_dev = vlan->lowerdev; 1084 struct netpoll *netpoll; 1085 int err = 0; 1086 1087 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 1088 err = -ENOMEM; 1089 if (!netpoll) 1090 goto out; 1091 1092 err = __netpoll_setup(netpoll, real_dev); 1093 if (err) { 1094 kfree(netpoll); 1095 goto out; 1096 } 1097 1098 vlan->netpoll = netpoll; 1099 1100 out: 1101 return err; 1102 } 1103 1104 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1105 { 1106 struct macvlan_dev *vlan = netdev_priv(dev); 1107 struct netpoll *netpoll = vlan->netpoll; 1108 1109 if (!netpoll) 1110 return; 1111 1112 vlan->netpoll = NULL; 1113 1114 __netpoll_free(netpoll); 1115 } 1116 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1117 1118 static int macvlan_dev_get_iflink(const struct net_device *dev) 1119 { 1120 struct macvlan_dev *vlan = netdev_priv(dev); 1121 1122 return vlan->lowerdev->ifindex; 1123 } 1124 1125 static const struct ethtool_ops macvlan_ethtool_ops = { 1126 .get_link = ethtool_op_get_link, 1127 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1128 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1129 .get_ts_info = macvlan_ethtool_get_ts_info, 1130 }; 1131 1132 static const struct net_device_ops macvlan_netdev_ops = { 1133 .ndo_init = macvlan_init, 1134 .ndo_uninit = macvlan_uninit, 1135 .ndo_open = macvlan_open, 1136 .ndo_stop = macvlan_stop, 1137 .ndo_start_xmit = macvlan_start_xmit, 1138 .ndo_change_mtu = macvlan_change_mtu, 1139 .ndo_do_ioctl = macvlan_do_ioctl, 1140 .ndo_fix_features = macvlan_fix_features, 1141 .ndo_change_rx_flags = macvlan_change_rx_flags, 1142 .ndo_set_mac_address = macvlan_set_mac_address, 1143 .ndo_set_rx_mode = macvlan_set_mac_lists, 1144 .ndo_get_stats64 = macvlan_dev_get_stats64, 1145 .ndo_validate_addr = eth_validate_addr, 1146 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1147 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1148 .ndo_fdb_add = macvlan_fdb_add, 1149 .ndo_fdb_del = macvlan_fdb_del, 1150 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1151 #ifdef CONFIG_NET_POLL_CONTROLLER 1152 .ndo_poll_controller = macvlan_dev_poll_controller, 1153 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1154 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1155 #endif 1156 .ndo_get_iflink = macvlan_dev_get_iflink, 1157 .ndo_features_check = passthru_features_check, 1158 .ndo_change_proto_down = dev_change_proto_down_generic, 1159 }; 1160 1161 void macvlan_common_setup(struct net_device *dev) 1162 { 1163 ether_setup(dev); 1164 1165 dev->min_mtu = 0; 1166 dev->max_mtu = ETH_MAX_MTU; 1167 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1168 netif_keep_dst(dev); 1169 dev->priv_flags |= IFF_UNICAST_FLT; 1170 dev->netdev_ops = &macvlan_netdev_ops; 1171 dev->needs_free_netdev = true; 1172 dev->header_ops = &macvlan_hard_header_ops; 1173 dev->ethtool_ops = &macvlan_ethtool_ops; 1174 } 1175 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1176 1177 static void macvlan_setup(struct net_device *dev) 1178 { 1179 macvlan_common_setup(dev); 1180 dev->priv_flags |= IFF_NO_QUEUE; 1181 } 1182 1183 static int macvlan_port_create(struct net_device *dev) 1184 { 1185 struct macvlan_port *port; 1186 unsigned int i; 1187 int err; 1188 1189 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1190 return -EINVAL; 1191 1192 if (netdev_is_rx_handler_busy(dev)) 1193 return -EBUSY; 1194 1195 port = kzalloc(sizeof(*port), GFP_KERNEL); 1196 if (port == NULL) 1197 return -ENOMEM; 1198 1199 port->dev = dev; 1200 ether_addr_copy(port->perm_addr, dev->dev_addr); 1201 INIT_LIST_HEAD(&port->vlans); 1202 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1203 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1204 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1205 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1206 1207 skb_queue_head_init(&port->bc_queue); 1208 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1209 1210 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1211 if (err) 1212 kfree(port); 1213 else 1214 dev->priv_flags |= IFF_MACVLAN_PORT; 1215 return err; 1216 } 1217 1218 static void macvlan_port_destroy(struct net_device *dev) 1219 { 1220 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1221 struct sk_buff *skb; 1222 1223 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1224 netdev_rx_handler_unregister(dev); 1225 1226 /* After this point, no packet can schedule bc_work anymore, 1227 * but we need to cancel it and purge left skbs if any. 1228 */ 1229 cancel_work_sync(&port->bc_work); 1230 1231 while ((skb = __skb_dequeue(&port->bc_queue))) { 1232 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 1233 1234 if (src) 1235 dev_put(src->dev); 1236 1237 kfree_skb(skb); 1238 } 1239 1240 /* If the lower device address has been changed by passthru 1241 * macvlan, put it back. 1242 */ 1243 if (macvlan_passthru(port) && 1244 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { 1245 struct sockaddr sa; 1246 1247 sa.sa_family = port->dev->type; 1248 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len); 1249 dev_set_mac_address(port->dev, &sa, NULL); 1250 } 1251 1252 kfree(port); 1253 } 1254 1255 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[], 1256 struct netlink_ext_ack *extack) 1257 { 1258 if (tb[IFLA_ADDRESS]) { 1259 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1260 return -EINVAL; 1261 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1262 return -EADDRNOTAVAIL; 1263 } 1264 1265 if (!data) 1266 return 0; 1267 1268 if (data[IFLA_MACVLAN_FLAGS] && 1269 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1270 return -EINVAL; 1271 1272 if (data[IFLA_MACVLAN_MODE]) { 1273 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1274 case MACVLAN_MODE_PRIVATE: 1275 case MACVLAN_MODE_VEPA: 1276 case MACVLAN_MODE_BRIDGE: 1277 case MACVLAN_MODE_PASSTHRU: 1278 case MACVLAN_MODE_SOURCE: 1279 break; 1280 default: 1281 return -EINVAL; 1282 } 1283 } 1284 1285 if (data[IFLA_MACVLAN_MACADDR_MODE]) { 1286 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1287 case MACVLAN_MACADDR_ADD: 1288 case MACVLAN_MACADDR_DEL: 1289 case MACVLAN_MACADDR_FLUSH: 1290 case MACVLAN_MACADDR_SET: 1291 break; 1292 default: 1293 return -EINVAL; 1294 } 1295 } 1296 1297 if (data[IFLA_MACVLAN_MACADDR]) { 1298 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1299 return -EINVAL; 1300 1301 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1302 return -EADDRNOTAVAIL; 1303 } 1304 1305 if (data[IFLA_MACVLAN_MACADDR_COUNT]) 1306 return -EINVAL; 1307 1308 return 0; 1309 } 1310 1311 /** 1312 * reconfigure list of remote source mac address 1313 * (only for macvlan devices in source mode) 1314 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1315 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1316 */ 1317 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1318 struct nlattr *data[]) 1319 { 1320 char *addr = NULL; 1321 int ret, rem, len; 1322 struct nlattr *nla, *head; 1323 struct macvlan_source_entry *entry; 1324 1325 if (data[IFLA_MACVLAN_MACADDR]) 1326 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1327 1328 if (mode == MACVLAN_MACADDR_ADD) { 1329 if (!addr) 1330 return -EINVAL; 1331 1332 return macvlan_hash_add_source(vlan, addr); 1333 1334 } else if (mode == MACVLAN_MACADDR_DEL) { 1335 if (!addr) 1336 return -EINVAL; 1337 1338 entry = macvlan_hash_lookup_source(vlan, addr); 1339 if (entry) { 1340 macvlan_hash_del_source(entry); 1341 vlan->macaddr_count--; 1342 } 1343 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1344 macvlan_flush_sources(vlan->port, vlan); 1345 } else if (mode == MACVLAN_MACADDR_SET) { 1346 macvlan_flush_sources(vlan->port, vlan); 1347 1348 if (addr) { 1349 ret = macvlan_hash_add_source(vlan, addr); 1350 if (ret) 1351 return ret; 1352 } 1353 1354 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1355 return 0; 1356 1357 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1358 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1359 1360 nla_for_each_attr(nla, head, len, rem) { 1361 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1362 nla_len(nla) != ETH_ALEN) 1363 continue; 1364 1365 addr = nla_data(nla); 1366 ret = macvlan_hash_add_source(vlan, addr); 1367 if (ret) 1368 return ret; 1369 } 1370 } else { 1371 return -EINVAL; 1372 } 1373 1374 return 0; 1375 } 1376 1377 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1378 struct nlattr *tb[], struct nlattr *data[], 1379 struct netlink_ext_ack *extack) 1380 { 1381 struct macvlan_dev *vlan = netdev_priv(dev); 1382 struct macvlan_port *port; 1383 struct net_device *lowerdev; 1384 int err; 1385 int macmode; 1386 bool create = false; 1387 1388 if (!tb[IFLA_LINK]) 1389 return -EINVAL; 1390 1391 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1392 if (lowerdev == NULL) 1393 return -ENODEV; 1394 1395 /* When creating macvlans or macvtaps on top of other macvlans - use 1396 * the real device as the lowerdev. 1397 */ 1398 if (netif_is_macvlan(lowerdev)) 1399 lowerdev = macvlan_dev_real_dev(lowerdev); 1400 1401 if (!tb[IFLA_MTU]) 1402 dev->mtu = lowerdev->mtu; 1403 else if (dev->mtu > lowerdev->mtu) 1404 return -EINVAL; 1405 1406 /* MTU range: 68 - lowerdev->max_mtu */ 1407 dev->min_mtu = ETH_MIN_MTU; 1408 dev->max_mtu = lowerdev->max_mtu; 1409 1410 if (!tb[IFLA_ADDRESS]) 1411 eth_hw_addr_random(dev); 1412 1413 if (!netif_is_macvlan_port(lowerdev)) { 1414 err = macvlan_port_create(lowerdev); 1415 if (err < 0) 1416 return err; 1417 create = true; 1418 } 1419 port = macvlan_port_get_rtnl(lowerdev); 1420 1421 /* Only 1 macvlan device can be created in passthru mode */ 1422 if (macvlan_passthru(port)) { 1423 /* The macvlan port must be not created this time, 1424 * still goto destroy_macvlan_port for readability. 1425 */ 1426 err = -EINVAL; 1427 goto destroy_macvlan_port; 1428 } 1429 1430 vlan->lowerdev = lowerdev; 1431 vlan->dev = dev; 1432 vlan->port = port; 1433 vlan->set_features = MACVLAN_FEATURES; 1434 1435 vlan->mode = MACVLAN_MODE_VEPA; 1436 if (data && data[IFLA_MACVLAN_MODE]) 1437 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1438 1439 if (data && data[IFLA_MACVLAN_FLAGS]) 1440 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1441 1442 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1443 if (port->count) { 1444 err = -EINVAL; 1445 goto destroy_macvlan_port; 1446 } 1447 macvlan_set_passthru(port); 1448 eth_hw_addr_inherit(dev, lowerdev); 1449 } 1450 1451 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1452 if (vlan->mode != MACVLAN_MODE_SOURCE) { 1453 err = -EINVAL; 1454 goto destroy_macvlan_port; 1455 } 1456 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1457 err = macvlan_changelink_sources(vlan, macmode, data); 1458 if (err) 1459 goto destroy_macvlan_port; 1460 } 1461 1462 err = register_netdevice(dev); 1463 if (err < 0) 1464 goto destroy_macvlan_port; 1465 1466 dev->priv_flags |= IFF_MACVLAN; 1467 err = netdev_upper_dev_link(lowerdev, dev, extack); 1468 if (err) 1469 goto unregister_netdev; 1470 1471 list_add_tail_rcu(&vlan->list, &port->vlans); 1472 netif_stacked_transfer_operstate(lowerdev, dev); 1473 linkwatch_fire_event(dev); 1474 1475 return 0; 1476 1477 unregister_netdev: 1478 /* macvlan_uninit would free the macvlan port */ 1479 unregister_netdevice(dev); 1480 return err; 1481 destroy_macvlan_port: 1482 /* the macvlan port may be freed by macvlan_uninit when fail to register. 1483 * so we destroy the macvlan port only when it's valid. 1484 */ 1485 if (create && macvlan_port_get_rtnl(lowerdev)) 1486 macvlan_port_destroy(port->dev); 1487 return err; 1488 } 1489 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1490 1491 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1492 struct nlattr *tb[], struct nlattr *data[], 1493 struct netlink_ext_ack *extack) 1494 { 1495 return macvlan_common_newlink(src_net, dev, tb, data, extack); 1496 } 1497 1498 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1499 { 1500 struct macvlan_dev *vlan = netdev_priv(dev); 1501 1502 if (vlan->mode == MACVLAN_MODE_SOURCE) 1503 macvlan_flush_sources(vlan->port, vlan); 1504 list_del_rcu(&vlan->list); 1505 unregister_netdevice_queue(dev, head); 1506 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1507 } 1508 EXPORT_SYMBOL_GPL(macvlan_dellink); 1509 1510 static int macvlan_changelink(struct net_device *dev, 1511 struct nlattr *tb[], struct nlattr *data[], 1512 struct netlink_ext_ack *extack) 1513 { 1514 struct macvlan_dev *vlan = netdev_priv(dev); 1515 enum macvlan_mode mode; 1516 bool set_mode = false; 1517 enum macvlan_macaddr_mode macmode; 1518 int ret; 1519 1520 /* Validate mode, but don't set yet: setting flags may fail. */ 1521 if (data && data[IFLA_MACVLAN_MODE]) { 1522 set_mode = true; 1523 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1524 /* Passthrough mode can't be set or cleared dynamically */ 1525 if ((mode == MACVLAN_MODE_PASSTHRU) != 1526 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1527 return -EINVAL; 1528 if (vlan->mode == MACVLAN_MODE_SOURCE && 1529 vlan->mode != mode) 1530 macvlan_flush_sources(vlan->port, vlan); 1531 } 1532 1533 if (data && data[IFLA_MACVLAN_FLAGS]) { 1534 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1535 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1536 if (macvlan_passthru(vlan->port) && promisc) { 1537 int err; 1538 1539 if (flags & MACVLAN_FLAG_NOPROMISC) 1540 err = dev_set_promiscuity(vlan->lowerdev, -1); 1541 else 1542 err = dev_set_promiscuity(vlan->lowerdev, 1); 1543 if (err < 0) 1544 return err; 1545 } 1546 vlan->flags = flags; 1547 } 1548 if (set_mode) 1549 vlan->mode = mode; 1550 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1551 if (vlan->mode != MACVLAN_MODE_SOURCE) 1552 return -EINVAL; 1553 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1554 ret = macvlan_changelink_sources(vlan, macmode, data); 1555 if (ret) 1556 return ret; 1557 } 1558 return 0; 1559 } 1560 1561 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1562 { 1563 if (vlan->macaddr_count == 0) 1564 return 0; 1565 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1566 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1567 } 1568 1569 static size_t macvlan_get_size(const struct net_device *dev) 1570 { 1571 struct macvlan_dev *vlan = netdev_priv(dev); 1572 1573 return (0 1574 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1575 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1576 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1577 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1578 ); 1579 } 1580 1581 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1582 const struct macvlan_dev *vlan, 1583 const int i) 1584 { 1585 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1586 struct macvlan_source_entry *entry; 1587 1588 hlist_for_each_entry_rcu(entry, h, hlist) { 1589 if (entry->vlan != vlan) 1590 continue; 1591 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1592 return 1; 1593 } 1594 return 0; 1595 } 1596 1597 static int macvlan_fill_info(struct sk_buff *skb, 1598 const struct net_device *dev) 1599 { 1600 struct macvlan_dev *vlan = netdev_priv(dev); 1601 int i; 1602 struct nlattr *nest; 1603 1604 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1605 goto nla_put_failure; 1606 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1607 goto nla_put_failure; 1608 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1609 goto nla_put_failure; 1610 if (vlan->macaddr_count > 0) { 1611 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA); 1612 if (nest == NULL) 1613 goto nla_put_failure; 1614 1615 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1616 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1617 goto nla_put_failure; 1618 } 1619 nla_nest_end(skb, nest); 1620 } 1621 return 0; 1622 1623 nla_put_failure: 1624 return -EMSGSIZE; 1625 } 1626 1627 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1628 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1629 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1630 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1631 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1632 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1633 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1634 }; 1635 1636 int macvlan_link_register(struct rtnl_link_ops *ops) 1637 { 1638 /* common fields */ 1639 ops->validate = macvlan_validate; 1640 ops->maxtype = IFLA_MACVLAN_MAX; 1641 ops->policy = macvlan_policy; 1642 ops->changelink = macvlan_changelink; 1643 ops->get_size = macvlan_get_size; 1644 ops->fill_info = macvlan_fill_info; 1645 1646 return rtnl_link_register(ops); 1647 }; 1648 EXPORT_SYMBOL_GPL(macvlan_link_register); 1649 1650 static struct net *macvlan_get_link_net(const struct net_device *dev) 1651 { 1652 return dev_net(macvlan_dev_real_dev(dev)); 1653 } 1654 1655 static struct rtnl_link_ops macvlan_link_ops = { 1656 .kind = "macvlan", 1657 .setup = macvlan_setup, 1658 .newlink = macvlan_newlink, 1659 .dellink = macvlan_dellink, 1660 .get_link_net = macvlan_get_link_net, 1661 .priv_size = sizeof(struct macvlan_dev), 1662 }; 1663 1664 static int macvlan_device_event(struct notifier_block *unused, 1665 unsigned long event, void *ptr) 1666 { 1667 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1668 struct macvlan_dev *vlan, *next; 1669 struct macvlan_port *port; 1670 LIST_HEAD(list_kill); 1671 1672 if (!netif_is_macvlan_port(dev)) 1673 return NOTIFY_DONE; 1674 1675 port = macvlan_port_get_rtnl(dev); 1676 1677 switch (event) { 1678 case NETDEV_UP: 1679 case NETDEV_DOWN: 1680 case NETDEV_CHANGE: 1681 list_for_each_entry(vlan, &port->vlans, list) 1682 netif_stacked_transfer_operstate(vlan->lowerdev, 1683 vlan->dev); 1684 break; 1685 case NETDEV_FEAT_CHANGE: 1686 list_for_each_entry(vlan, &port->vlans, list) { 1687 vlan->dev->gso_max_size = dev->gso_max_size; 1688 vlan->dev->gso_max_segs = dev->gso_max_segs; 1689 netdev_update_features(vlan->dev); 1690 } 1691 break; 1692 case NETDEV_CHANGEMTU: 1693 list_for_each_entry(vlan, &port->vlans, list) { 1694 if (vlan->dev->mtu <= dev->mtu) 1695 continue; 1696 dev_set_mtu(vlan->dev, dev->mtu); 1697 } 1698 break; 1699 case NETDEV_CHANGEADDR: 1700 if (!macvlan_passthru(port)) 1701 return NOTIFY_DONE; 1702 1703 vlan = list_first_entry_or_null(&port->vlans, 1704 struct macvlan_dev, 1705 list); 1706 1707 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1708 return NOTIFY_BAD; 1709 1710 break; 1711 case NETDEV_UNREGISTER: 1712 /* twiddle thumbs on netns device moves */ 1713 if (dev->reg_state != NETREG_UNREGISTERING) 1714 break; 1715 1716 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1717 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1718 unregister_netdevice_many(&list_kill); 1719 break; 1720 case NETDEV_PRE_TYPE_CHANGE: 1721 /* Forbid underlaying device to change its type. */ 1722 return NOTIFY_BAD; 1723 1724 case NETDEV_NOTIFY_PEERS: 1725 case NETDEV_BONDING_FAILOVER: 1726 case NETDEV_RESEND_IGMP: 1727 /* Propagate to all vlans */ 1728 list_for_each_entry(vlan, &port->vlans, list) 1729 call_netdevice_notifiers(event, vlan->dev); 1730 } 1731 return NOTIFY_DONE; 1732 } 1733 1734 static struct notifier_block macvlan_notifier_block __read_mostly = { 1735 .notifier_call = macvlan_device_event, 1736 }; 1737 1738 static int __init macvlan_init_module(void) 1739 { 1740 int err; 1741 1742 register_netdevice_notifier(&macvlan_notifier_block); 1743 1744 err = macvlan_link_register(&macvlan_link_ops); 1745 if (err < 0) 1746 goto err1; 1747 return 0; 1748 err1: 1749 unregister_netdevice_notifier(&macvlan_notifier_block); 1750 return err; 1751 } 1752 1753 static void __exit macvlan_cleanup_module(void) 1754 { 1755 rtnl_link_unregister(&macvlan_link_ops); 1756 unregister_netdevice_notifier(&macvlan_notifier_block); 1757 } 1758 1759 module_init(macvlan_init_module); 1760 module_exit(macvlan_cleanup_module); 1761 1762 MODULE_LICENSE("GPL"); 1763 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1764 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1765 MODULE_ALIAS_RTNL_LINK("macvlan"); 1766