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