1 /* 2 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 of 7 * the License, or (at your option) any later version. 8 * 9 * The code this is based on carried the following copyright notice: 10 * --- 11 * (C) Copyright 2001-2006 12 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com 13 * Re-worked by Ben Greear <greearb@candelatech.com> 14 * --- 15 */ 16 #include <linux/kernel.h> 17 #include <linux/types.h> 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/errno.h> 21 #include <linux/slab.h> 22 #include <linux/string.h> 23 #include <linux/rculist.h> 24 #include <linux/notifier.h> 25 #include <linux/netdevice.h> 26 #include <linux/etherdevice.h> 27 #include <linux/ethtool.h> 28 #include <linux/if_arp.h> 29 #include <linux/if_vlan.h> 30 #include <linux/if_link.h> 31 #include <linux/if_macvlan.h> 32 #include <linux/hash.h> 33 #include <linux/workqueue.h> 34 #include <net/rtnetlink.h> 35 #include <net/xfrm.h> 36 #include <linux/netpoll.h> 37 38 #define MACVLAN_HASH_BITS 8 39 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS) 40 #define MACVLAN_BC_QUEUE_LEN 1000 41 42 #define MACVLAN_F_PASSTHRU 1 43 #define MACVLAN_F_ADDRCHANGE 2 44 45 struct macvlan_port { 46 struct net_device *dev; 47 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 48 struct list_head vlans; 49 struct sk_buff_head bc_queue; 50 struct work_struct bc_work; 51 u32 flags; 52 int count; 53 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE]; 54 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ); 55 unsigned char perm_addr[ETH_ALEN]; 56 }; 57 58 struct macvlan_source_entry { 59 struct hlist_node hlist; 60 struct macvlan_dev *vlan; 61 unsigned char addr[6+2] __aligned(sizeof(u16)); 62 struct rcu_head rcu; 63 }; 64 65 struct macvlan_skb_cb { 66 const struct macvlan_dev *src; 67 }; 68 69 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) 70 71 static void macvlan_port_destroy(struct net_device *dev); 72 73 static inline bool macvlan_passthru(const struct macvlan_port *port) 74 { 75 return port->flags & MACVLAN_F_PASSTHRU; 76 } 77 78 static inline void macvlan_set_passthru(struct macvlan_port *port) 79 { 80 port->flags |= MACVLAN_F_PASSTHRU; 81 } 82 83 static inline bool macvlan_addr_change(const struct macvlan_port *port) 84 { 85 return port->flags & MACVLAN_F_ADDRCHANGE; 86 } 87 88 static inline void macvlan_set_addr_change(struct macvlan_port *port) 89 { 90 port->flags |= MACVLAN_F_ADDRCHANGE; 91 } 92 93 static inline void macvlan_clear_addr_change(struct macvlan_port *port) 94 { 95 port->flags &= ~MACVLAN_F_ADDRCHANGE; 96 } 97 98 /* Hash Ethernet address */ 99 static u32 macvlan_eth_hash(const unsigned char *addr) 100 { 101 u64 value = get_unaligned((u64 *)addr); 102 103 /* only want 6 bytes */ 104 #ifdef __BIG_ENDIAN 105 value >>= 16; 106 #else 107 value <<= 16; 108 #endif 109 return hash_64(value, MACVLAN_HASH_BITS); 110 } 111 112 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) 113 { 114 return rcu_dereference(dev->rx_handler_data); 115 } 116 117 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) 118 { 119 return rtnl_dereference(dev->rx_handler_data); 120 } 121 122 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) 123 124 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 125 const unsigned char *addr) 126 { 127 struct macvlan_dev *vlan; 128 u32 idx = macvlan_eth_hash(addr); 129 130 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) { 131 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) 132 return vlan; 133 } 134 return NULL; 135 } 136 137 static struct macvlan_source_entry *macvlan_hash_lookup_source( 138 const struct macvlan_dev *vlan, 139 const unsigned char *addr) 140 { 141 struct macvlan_source_entry *entry; 142 u32 idx = macvlan_eth_hash(addr); 143 struct hlist_head *h = &vlan->port->vlan_source_hash[idx]; 144 145 hlist_for_each_entry_rcu(entry, h, hlist) { 146 if (ether_addr_equal_64bits(entry->addr, addr) && 147 entry->vlan == vlan) 148 return entry; 149 } 150 return NULL; 151 } 152 153 static int macvlan_hash_add_source(struct macvlan_dev *vlan, 154 const unsigned char *addr) 155 { 156 struct macvlan_port *port = vlan->port; 157 struct macvlan_source_entry *entry; 158 struct hlist_head *h; 159 160 entry = macvlan_hash_lookup_source(vlan, addr); 161 if (entry) 162 return 0; 163 164 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 165 if (!entry) 166 return -ENOMEM; 167 168 ether_addr_copy(entry->addr, addr); 169 entry->vlan = vlan; 170 h = &port->vlan_source_hash[macvlan_eth_hash(addr)]; 171 hlist_add_head_rcu(&entry->hlist, h); 172 vlan->macaddr_count++; 173 174 return 0; 175 } 176 177 static void macvlan_hash_add(struct macvlan_dev *vlan) 178 { 179 struct macvlan_port *port = vlan->port; 180 const unsigned char *addr = vlan->dev->dev_addr; 181 u32 idx = macvlan_eth_hash(addr); 182 183 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]); 184 } 185 186 static void macvlan_hash_del_source(struct macvlan_source_entry *entry) 187 { 188 hlist_del_rcu(&entry->hlist); 189 kfree_rcu(entry, rcu); 190 } 191 192 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) 193 { 194 hlist_del_rcu(&vlan->hlist); 195 if (sync) 196 synchronize_rcu(); 197 } 198 199 static void macvlan_hash_change_addr(struct macvlan_dev *vlan, 200 const unsigned char *addr) 201 { 202 macvlan_hash_del(vlan, true); 203 /* Now that we are unhashed it is safe to change the device 204 * address without confusing packet delivery. 205 */ 206 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); 207 macvlan_hash_add(vlan); 208 } 209 210 static bool macvlan_addr_busy(const struct macvlan_port *port, 211 const unsigned char *addr) 212 { 213 /* Test to see if the specified address is 214 * currently in use by the underlying device or 215 * another macvlan. 216 */ 217 if (!macvlan_passthru(port) && !macvlan_addr_change(port) && 218 ether_addr_equal_64bits(port->dev->dev_addr, addr)) 219 return true; 220 221 if (macvlan_hash_lookup(port, addr)) 222 return true; 223 224 return false; 225 } 226 227 228 static int macvlan_broadcast_one(struct sk_buff *skb, 229 const struct macvlan_dev *vlan, 230 const struct ethhdr *eth, bool local) 231 { 232 struct net_device *dev = vlan->dev; 233 234 if (local) 235 return __dev_forward_skb(dev, skb); 236 237 skb->dev = dev; 238 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 239 skb->pkt_type = PACKET_BROADCAST; 240 else 241 skb->pkt_type = PACKET_MULTICAST; 242 243 return 0; 244 } 245 246 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) 247 { 248 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); 249 } 250 251 252 static unsigned int mc_hash(const struct macvlan_dev *vlan, 253 const unsigned char *addr) 254 { 255 u32 val = __get_unaligned_cpu32(addr + 2); 256 257 val ^= macvlan_hash_mix(vlan); 258 return hash_32(val, MACVLAN_MC_FILTER_BITS); 259 } 260 261 static void macvlan_broadcast(struct sk_buff *skb, 262 const struct macvlan_port *port, 263 struct net_device *src, 264 enum macvlan_mode mode) 265 { 266 const struct ethhdr *eth = eth_hdr(skb); 267 const struct macvlan_dev *vlan; 268 struct sk_buff *nskb; 269 unsigned int i; 270 int err; 271 unsigned int hash; 272 273 if (skb->protocol == htons(ETH_P_PAUSE)) 274 return; 275 276 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 277 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) { 278 if (vlan->dev == src || !(vlan->mode & mode)) 279 continue; 280 281 hash = mc_hash(vlan, eth->h_dest); 282 if (!test_bit(hash, vlan->mc_filter)) 283 continue; 284 285 err = NET_RX_DROP; 286 nskb = skb_clone(skb, GFP_ATOMIC); 287 if (likely(nskb)) 288 err = macvlan_broadcast_one( 289 nskb, vlan, eth, 290 mode == MACVLAN_MODE_BRIDGE) ?: 291 netif_rx_ni(nskb); 292 macvlan_count_rx(vlan, skb->len + ETH_HLEN, 293 err == NET_RX_SUCCESS, true); 294 } 295 } 296 } 297 298 static void macvlan_process_broadcast(struct work_struct *w) 299 { 300 struct macvlan_port *port = container_of(w, struct macvlan_port, 301 bc_work); 302 struct sk_buff *skb; 303 struct sk_buff_head list; 304 305 __skb_queue_head_init(&list); 306 307 spin_lock_bh(&port->bc_queue.lock); 308 skb_queue_splice_tail_init(&port->bc_queue, &list); 309 spin_unlock_bh(&port->bc_queue.lock); 310 311 while ((skb = __skb_dequeue(&list))) { 312 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 313 314 rcu_read_lock(); 315 316 if (!src) 317 /* frame comes from an external address */ 318 macvlan_broadcast(skb, port, NULL, 319 MACVLAN_MODE_PRIVATE | 320 MACVLAN_MODE_VEPA | 321 MACVLAN_MODE_PASSTHRU| 322 MACVLAN_MODE_BRIDGE); 323 else if (src->mode == MACVLAN_MODE_VEPA) 324 /* flood to everyone except source */ 325 macvlan_broadcast(skb, port, src->dev, 326 MACVLAN_MODE_VEPA | 327 MACVLAN_MODE_BRIDGE); 328 else 329 /* 330 * flood only to VEPA ports, bridge ports 331 * already saw the frame on the way out. 332 */ 333 macvlan_broadcast(skb, port, src->dev, 334 MACVLAN_MODE_VEPA); 335 336 rcu_read_unlock(); 337 338 if (src) 339 dev_put(src->dev); 340 kfree_skb(skb); 341 } 342 } 343 344 static void macvlan_broadcast_enqueue(struct macvlan_port *port, 345 const struct macvlan_dev *src, 346 struct sk_buff *skb) 347 { 348 struct sk_buff *nskb; 349 int err = -ENOMEM; 350 351 nskb = skb_clone(skb, GFP_ATOMIC); 352 if (!nskb) 353 goto err; 354 355 MACVLAN_SKB_CB(nskb)->src = src; 356 357 spin_lock(&port->bc_queue.lock); 358 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) { 359 if (src) 360 dev_hold(src->dev); 361 __skb_queue_tail(&port->bc_queue, nskb); 362 err = 0; 363 } 364 spin_unlock(&port->bc_queue.lock); 365 366 if (err) 367 goto free_nskb; 368 369 schedule_work(&port->bc_work); 370 return; 371 372 free_nskb: 373 kfree_skb(nskb); 374 err: 375 atomic_long_inc(&skb->dev->rx_dropped); 376 } 377 378 static void macvlan_flush_sources(struct macvlan_port *port, 379 struct macvlan_dev *vlan) 380 { 381 int i; 382 383 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 384 struct hlist_node *h, *n; 385 386 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) { 387 struct macvlan_source_entry *entry; 388 389 entry = hlist_entry(h, struct macvlan_source_entry, 390 hlist); 391 if (entry->vlan == vlan) 392 macvlan_hash_del_source(entry); 393 } 394 } 395 vlan->macaddr_count = 0; 396 } 397 398 static void macvlan_forward_source_one(struct sk_buff *skb, 399 struct macvlan_dev *vlan) 400 { 401 struct sk_buff *nskb; 402 struct net_device *dev; 403 int len; 404 int ret; 405 406 dev = vlan->dev; 407 if (unlikely(!(dev->flags & IFF_UP))) 408 return; 409 410 nskb = skb_clone(skb, GFP_ATOMIC); 411 if (!nskb) 412 return; 413 414 len = nskb->len + ETH_HLEN; 415 nskb->dev = dev; 416 417 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr)) 418 nskb->pkt_type = PACKET_HOST; 419 420 ret = netif_rx(nskb); 421 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 422 } 423 424 static void macvlan_forward_source(struct sk_buff *skb, 425 struct macvlan_port *port, 426 const unsigned char *addr) 427 { 428 struct macvlan_source_entry *entry; 429 u32 idx = macvlan_eth_hash(addr); 430 struct hlist_head *h = &port->vlan_source_hash[idx]; 431 432 hlist_for_each_entry_rcu(entry, h, hlist) { 433 if (ether_addr_equal_64bits(entry->addr, addr)) 434 macvlan_forward_source_one(skb, entry->vlan); 435 } 436 } 437 438 /* called under rcu_read_lock() from netif_receive_skb */ 439 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) 440 { 441 struct macvlan_port *port; 442 struct sk_buff *skb = *pskb; 443 const struct ethhdr *eth = eth_hdr(skb); 444 const struct macvlan_dev *vlan; 445 const struct macvlan_dev *src; 446 struct net_device *dev; 447 unsigned int len = 0; 448 int ret; 449 rx_handler_result_t handle_res; 450 451 port = macvlan_port_get_rcu(skb->dev); 452 if (is_multicast_ether_addr(eth->h_dest)) { 453 unsigned int hash; 454 455 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); 456 if (!skb) 457 return RX_HANDLER_CONSUMED; 458 *pskb = skb; 459 eth = eth_hdr(skb); 460 macvlan_forward_source(skb, port, eth->h_source); 461 src = macvlan_hash_lookup(port, eth->h_source); 462 if (src && src->mode != MACVLAN_MODE_VEPA && 463 src->mode != MACVLAN_MODE_BRIDGE) { 464 /* forward to original port. */ 465 vlan = src; 466 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: 467 netif_rx(skb); 468 handle_res = RX_HANDLER_CONSUMED; 469 goto out; 470 } 471 472 hash = mc_hash(NULL, eth->h_dest); 473 if (test_bit(hash, port->mc_filter)) 474 macvlan_broadcast_enqueue(port, src, skb); 475 476 return RX_HANDLER_PASS; 477 } 478 479 macvlan_forward_source(skb, port, eth->h_source); 480 if (macvlan_passthru(port)) 481 vlan = list_first_or_null_rcu(&port->vlans, 482 struct macvlan_dev, list); 483 else 484 vlan = macvlan_hash_lookup(port, eth->h_dest); 485 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE) 486 return RX_HANDLER_PASS; 487 488 dev = vlan->dev; 489 if (unlikely(!(dev->flags & IFF_UP))) { 490 kfree_skb(skb); 491 return RX_HANDLER_CONSUMED; 492 } 493 len = skb->len + ETH_HLEN; 494 skb = skb_share_check(skb, GFP_ATOMIC); 495 if (!skb) { 496 ret = NET_RX_DROP; 497 handle_res = RX_HANDLER_CONSUMED; 498 goto out; 499 } 500 501 *pskb = skb; 502 skb->dev = dev; 503 skb->pkt_type = PACKET_HOST; 504 505 ret = NET_RX_SUCCESS; 506 handle_res = RX_HANDLER_ANOTHER; 507 out: 508 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); 509 return handle_res; 510 } 511 512 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) 513 { 514 const struct macvlan_dev *vlan = netdev_priv(dev); 515 const struct macvlan_port *port = vlan->port; 516 const struct macvlan_dev *dest; 517 void *accel_priv = NULL; 518 519 if (vlan->mode == MACVLAN_MODE_BRIDGE) { 520 const struct ethhdr *eth = (void *)skb->data; 521 522 /* send to other bridge ports directly */ 523 if (is_multicast_ether_addr(eth->h_dest)) { 524 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); 525 goto xmit_world; 526 } 527 528 dest = macvlan_hash_lookup(port, eth->h_dest); 529 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { 530 /* send to lowerdev first for its network taps */ 531 dev_forward_skb(vlan->lowerdev, skb); 532 533 return NET_XMIT_SUCCESS; 534 } 535 } 536 537 /* For packets that are non-multicast and not bridged we will pass 538 * the necessary information so that the lowerdev can distinguish 539 * the source of the packets via the accel_priv value. 540 */ 541 accel_priv = vlan->accel_priv; 542 xmit_world: 543 skb->dev = vlan->lowerdev; 544 return dev_queue_xmit_accel(skb, accel_priv); 545 } 546 547 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) 548 { 549 #ifdef CONFIG_NET_POLL_CONTROLLER 550 if (vlan->netpoll) 551 netpoll_send_skb(vlan->netpoll, skb); 552 #else 553 BUG(); 554 #endif 555 return NETDEV_TX_OK; 556 } 557 558 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, 559 struct net_device *dev) 560 { 561 struct macvlan_dev *vlan = netdev_priv(dev); 562 unsigned int len = skb->len; 563 int ret; 564 565 if (unlikely(netpoll_tx_running(dev))) 566 return macvlan_netpoll_send_skb(vlan, skb); 567 568 ret = macvlan_queue_xmit(skb, dev); 569 570 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 571 struct vlan_pcpu_stats *pcpu_stats; 572 573 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); 574 u64_stats_update_begin(&pcpu_stats->syncp); 575 pcpu_stats->tx_packets++; 576 pcpu_stats->tx_bytes += len; 577 u64_stats_update_end(&pcpu_stats->syncp); 578 } else { 579 this_cpu_inc(vlan->pcpu_stats->tx_dropped); 580 } 581 return ret; 582 } 583 584 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 585 unsigned short type, const void *daddr, 586 const void *saddr, unsigned len) 587 { 588 const struct macvlan_dev *vlan = netdev_priv(dev); 589 struct net_device *lowerdev = vlan->lowerdev; 590 591 return dev_hard_header(skb, lowerdev, type, daddr, 592 saddr ? : dev->dev_addr, len); 593 } 594 595 static const struct header_ops macvlan_hard_header_ops = { 596 .create = macvlan_hard_header, 597 .parse = eth_header_parse, 598 .cache = eth_header_cache, 599 .cache_update = eth_header_cache_update, 600 }; 601 602 static int macvlan_open(struct net_device *dev) 603 { 604 struct macvlan_dev *vlan = netdev_priv(dev); 605 struct net_device *lowerdev = vlan->lowerdev; 606 int err; 607 608 if (macvlan_passthru(vlan->port)) { 609 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { 610 err = dev_set_promiscuity(lowerdev, 1); 611 if (err < 0) 612 goto out; 613 } 614 goto hash_add; 615 } 616 617 err = -EBUSY; 618 if (macvlan_addr_busy(vlan->port, dev->dev_addr)) 619 goto out; 620 621 /* Attempt to populate accel_priv which is used to offload the L2 622 * forwarding requests for unicast packets. 623 */ 624 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) 625 vlan->accel_priv = 626 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); 627 628 /* If earlier attempt to offload failed, or accel_priv is not 629 * populated we must add the unicast address to the lower device. 630 */ 631 if (IS_ERR_OR_NULL(vlan->accel_priv)) { 632 vlan->accel_priv = NULL; 633 err = dev_uc_add(lowerdev, dev->dev_addr); 634 if (err < 0) 635 goto out; 636 } 637 638 if (dev->flags & IFF_ALLMULTI) { 639 err = dev_set_allmulti(lowerdev, 1); 640 if (err < 0) 641 goto del_unicast; 642 } 643 644 if (dev->flags & IFF_PROMISC) { 645 err = dev_set_promiscuity(lowerdev, 1); 646 if (err < 0) 647 goto clear_multi; 648 } 649 650 hash_add: 651 macvlan_hash_add(vlan); 652 return 0; 653 654 clear_multi: 655 if (dev->flags & IFF_ALLMULTI) 656 dev_set_allmulti(lowerdev, -1); 657 del_unicast: 658 if (vlan->accel_priv) { 659 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 660 vlan->accel_priv); 661 vlan->accel_priv = NULL; 662 } else { 663 dev_uc_del(lowerdev, dev->dev_addr); 664 } 665 out: 666 return err; 667 } 668 669 static int macvlan_stop(struct net_device *dev) 670 { 671 struct macvlan_dev *vlan = netdev_priv(dev); 672 struct net_device *lowerdev = vlan->lowerdev; 673 674 if (vlan->accel_priv) { 675 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, 676 vlan->accel_priv); 677 vlan->accel_priv = NULL; 678 } 679 680 dev_uc_unsync(lowerdev, dev); 681 dev_mc_unsync(lowerdev, dev); 682 683 if (macvlan_passthru(vlan->port)) { 684 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) 685 dev_set_promiscuity(lowerdev, -1); 686 goto hash_del; 687 } 688 689 if (dev->flags & IFF_ALLMULTI) 690 dev_set_allmulti(lowerdev, -1); 691 692 if (dev->flags & IFF_PROMISC) 693 dev_set_promiscuity(lowerdev, -1); 694 695 dev_uc_del(lowerdev, dev->dev_addr); 696 697 hash_del: 698 macvlan_hash_del(vlan, !dev->dismantle); 699 return 0; 700 } 701 702 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr) 703 { 704 struct macvlan_dev *vlan = netdev_priv(dev); 705 struct net_device *lowerdev = vlan->lowerdev; 706 struct macvlan_port *port = vlan->port; 707 int err; 708 709 if (!(dev->flags & IFF_UP)) { 710 /* Just copy in the new address */ 711 ether_addr_copy(dev->dev_addr, addr); 712 } else { 713 /* Rehash and update the device filters */ 714 if (macvlan_addr_busy(vlan->port, addr)) 715 return -EBUSY; 716 717 if (!macvlan_passthru(port)) { 718 err = dev_uc_add(lowerdev, addr); 719 if (err) 720 return err; 721 722 dev_uc_del(lowerdev, dev->dev_addr); 723 } 724 725 macvlan_hash_change_addr(vlan, addr); 726 } 727 if (macvlan_passthru(port) && !macvlan_addr_change(port)) { 728 /* Since addr_change isn't set, we are here due to lower 729 * device change. Save the lower-dev address so we can 730 * restore it later. 731 */ 732 ether_addr_copy(vlan->port->perm_addr, 733 lowerdev->dev_addr); 734 } 735 macvlan_clear_addr_change(port); 736 return 0; 737 } 738 739 static int macvlan_set_mac_address(struct net_device *dev, void *p) 740 { 741 struct macvlan_dev *vlan = netdev_priv(dev); 742 struct sockaddr *addr = p; 743 744 if (!is_valid_ether_addr(addr->sa_data)) 745 return -EADDRNOTAVAIL; 746 747 /* If the addresses are the same, this is a no-op */ 748 if (ether_addr_equal(dev->dev_addr, addr->sa_data)) 749 return 0; 750 751 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 752 macvlan_set_addr_change(vlan->port); 753 return dev_set_mac_address(vlan->lowerdev, addr); 754 } 755 756 return macvlan_sync_address(dev, addr->sa_data); 757 } 758 759 static void macvlan_change_rx_flags(struct net_device *dev, int change) 760 { 761 struct macvlan_dev *vlan = netdev_priv(dev); 762 struct net_device *lowerdev = vlan->lowerdev; 763 764 if (dev->flags & IFF_UP) { 765 if (change & IFF_ALLMULTI) 766 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 767 if (change & IFF_PROMISC) 768 dev_set_promiscuity(lowerdev, 769 dev->flags & IFF_PROMISC ? 1 : -1); 770 771 } 772 } 773 774 static void macvlan_compute_filter(unsigned long *mc_filter, 775 struct net_device *dev, 776 struct macvlan_dev *vlan) 777 { 778 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 779 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); 780 } else { 781 struct netdev_hw_addr *ha; 782 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); 783 784 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); 785 netdev_for_each_mc_addr(ha, dev) { 786 __set_bit(mc_hash(vlan, ha->addr), filter); 787 } 788 789 __set_bit(mc_hash(vlan, dev->broadcast), filter); 790 791 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); 792 } 793 } 794 795 static void macvlan_set_mac_lists(struct net_device *dev) 796 { 797 struct macvlan_dev *vlan = netdev_priv(dev); 798 799 macvlan_compute_filter(vlan->mc_filter, dev, vlan); 800 801 dev_uc_sync(vlan->lowerdev, dev); 802 dev_mc_sync(vlan->lowerdev, dev); 803 804 /* This is slightly inaccurate as we're including the subscription 805 * list of vlan->lowerdev too. 806 * 807 * Bug alert: This only works if everyone has the same broadcast 808 * address as lowerdev. As soon as someone changes theirs this 809 * will break. 810 * 811 * However, this is already broken as when you change your broadcast 812 * address we don't get called. 813 * 814 * The solution is to maintain a list of broadcast addresses like 815 * we do for uc/mc, if you care. 816 */ 817 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); 818 } 819 820 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 821 { 822 struct macvlan_dev *vlan = netdev_priv(dev); 823 824 if (vlan->lowerdev->mtu < new_mtu) 825 return -EINVAL; 826 dev->mtu = new_mtu; 827 return 0; 828 } 829 830 /* 831 * macvlan network devices have devices nesting below it and are a special 832 * "super class" of normal network devices; split their locks off into a 833 * separate class since they always nest. 834 */ 835 static struct lock_class_key macvlan_netdev_addr_lock_key; 836 837 #define ALWAYS_ON_OFFLOADS \ 838 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ 839 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL) 840 841 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX) 842 843 #define MACVLAN_FEATURES \ 844 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 845 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \ 846 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 847 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 848 849 #define MACVLAN_STATE_MASK \ 850 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 851 852 static int macvlan_get_nest_level(struct net_device *dev) 853 { 854 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; 855 } 856 857 static void macvlan_set_lockdep_class(struct net_device *dev) 858 { 859 netdev_lockdep_set_classes(dev); 860 lockdep_set_class_and_subclass(&dev->addr_list_lock, 861 &macvlan_netdev_addr_lock_key, 862 macvlan_get_nest_level(dev)); 863 } 864 865 static int macvlan_init(struct net_device *dev) 866 { 867 struct macvlan_dev *vlan = netdev_priv(dev); 868 const struct net_device *lowerdev = vlan->lowerdev; 869 struct macvlan_port *port = vlan->port; 870 871 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 872 (lowerdev->state & MACVLAN_STATE_MASK); 873 dev->features = lowerdev->features & MACVLAN_FEATURES; 874 dev->features |= ALWAYS_ON_FEATURES; 875 dev->hw_features |= NETIF_F_LRO; 876 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; 877 dev->vlan_features |= ALWAYS_ON_OFFLOADS; 878 dev->hw_enc_features |= dev->features; 879 dev->gso_max_size = lowerdev->gso_max_size; 880 dev->gso_max_segs = lowerdev->gso_max_segs; 881 dev->hard_header_len = lowerdev->hard_header_len; 882 883 macvlan_set_lockdep_class(dev); 884 885 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 886 if (!vlan->pcpu_stats) 887 return -ENOMEM; 888 889 port->count += 1; 890 891 return 0; 892 } 893 894 static void macvlan_uninit(struct net_device *dev) 895 { 896 struct macvlan_dev *vlan = netdev_priv(dev); 897 struct macvlan_port *port = vlan->port; 898 899 free_percpu(vlan->pcpu_stats); 900 901 macvlan_flush_sources(port, vlan); 902 port->count -= 1; 903 if (!port->count) 904 macvlan_port_destroy(port->dev); 905 } 906 907 static void macvlan_dev_get_stats64(struct net_device *dev, 908 struct rtnl_link_stats64 *stats) 909 { 910 struct macvlan_dev *vlan = netdev_priv(dev); 911 912 if (vlan->pcpu_stats) { 913 struct vlan_pcpu_stats *p; 914 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; 915 u32 rx_errors = 0, tx_dropped = 0; 916 unsigned int start; 917 int i; 918 919 for_each_possible_cpu(i) { 920 p = per_cpu_ptr(vlan->pcpu_stats, i); 921 do { 922 start = u64_stats_fetch_begin_irq(&p->syncp); 923 rx_packets = p->rx_packets; 924 rx_bytes = p->rx_bytes; 925 rx_multicast = p->rx_multicast; 926 tx_packets = p->tx_packets; 927 tx_bytes = p->tx_bytes; 928 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 929 930 stats->rx_packets += rx_packets; 931 stats->rx_bytes += rx_bytes; 932 stats->multicast += rx_multicast; 933 stats->tx_packets += tx_packets; 934 stats->tx_bytes += tx_bytes; 935 /* rx_errors & tx_dropped are u32, updated 936 * without syncp protection. 937 */ 938 rx_errors += p->rx_errors; 939 tx_dropped += p->tx_dropped; 940 } 941 stats->rx_errors = rx_errors; 942 stats->rx_dropped = rx_errors; 943 stats->tx_dropped = tx_dropped; 944 } 945 } 946 947 static int macvlan_vlan_rx_add_vid(struct net_device *dev, 948 __be16 proto, u16 vid) 949 { 950 struct macvlan_dev *vlan = netdev_priv(dev); 951 struct net_device *lowerdev = vlan->lowerdev; 952 953 return vlan_vid_add(lowerdev, proto, vid); 954 } 955 956 static int macvlan_vlan_rx_kill_vid(struct net_device *dev, 957 __be16 proto, u16 vid) 958 { 959 struct macvlan_dev *vlan = netdev_priv(dev); 960 struct net_device *lowerdev = vlan->lowerdev; 961 962 vlan_vid_del(lowerdev, proto, vid); 963 return 0; 964 } 965 966 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 967 struct net_device *dev, 968 const unsigned char *addr, u16 vid, 969 u16 flags) 970 { 971 struct macvlan_dev *vlan = netdev_priv(dev); 972 int err = -EINVAL; 973 974 /* Support unicast filter only on passthru devices. 975 * Multicast filter should be allowed on all devices. 976 */ 977 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 978 return -EOPNOTSUPP; 979 980 if (flags & NLM_F_REPLACE) 981 return -EOPNOTSUPP; 982 983 if (is_unicast_ether_addr(addr)) 984 err = dev_uc_add_excl(dev, addr); 985 else if (is_multicast_ether_addr(addr)) 986 err = dev_mc_add_excl(dev, addr); 987 988 return err; 989 } 990 991 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], 992 struct net_device *dev, 993 const unsigned char *addr, u16 vid) 994 { 995 struct macvlan_dev *vlan = netdev_priv(dev); 996 int err = -EINVAL; 997 998 /* Support unicast filter only on passthru devices. 999 * Multicast filter should be allowed on all devices. 1000 */ 1001 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) 1002 return -EOPNOTSUPP; 1003 1004 if (is_unicast_ether_addr(addr)) 1005 err = dev_uc_del(dev, addr); 1006 else if (is_multicast_ether_addr(addr)) 1007 err = dev_mc_del(dev, addr); 1008 1009 return err; 1010 } 1011 1012 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 1013 struct ethtool_drvinfo *drvinfo) 1014 { 1015 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); 1016 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); 1017 } 1018 1019 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, 1020 struct ethtool_link_ksettings *cmd) 1021 { 1022 const struct macvlan_dev *vlan = netdev_priv(dev); 1023 1024 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); 1025 } 1026 1027 static netdev_features_t macvlan_fix_features(struct net_device *dev, 1028 netdev_features_t features) 1029 { 1030 struct macvlan_dev *vlan = netdev_priv(dev); 1031 netdev_features_t lowerdev_features = vlan->lowerdev->features; 1032 netdev_features_t mask; 1033 1034 features |= NETIF_F_ALL_FOR_ALL; 1035 features &= (vlan->set_features | ~MACVLAN_FEATURES); 1036 mask = features; 1037 1038 lowerdev_features &= (features | ~NETIF_F_LRO); 1039 features = netdev_increment_features(lowerdev_features, features, mask); 1040 features |= ALWAYS_ON_FEATURES; 1041 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES); 1042 1043 return features; 1044 } 1045 1046 #ifdef CONFIG_NET_POLL_CONTROLLER 1047 static void macvlan_dev_poll_controller(struct net_device *dev) 1048 { 1049 return; 1050 } 1051 1052 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 1053 { 1054 struct macvlan_dev *vlan = netdev_priv(dev); 1055 struct net_device *real_dev = vlan->lowerdev; 1056 struct netpoll *netpoll; 1057 int err = 0; 1058 1059 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 1060 err = -ENOMEM; 1061 if (!netpoll) 1062 goto out; 1063 1064 err = __netpoll_setup(netpoll, real_dev); 1065 if (err) { 1066 kfree(netpoll); 1067 goto out; 1068 } 1069 1070 vlan->netpoll = netpoll; 1071 1072 out: 1073 return err; 1074 } 1075 1076 static void macvlan_dev_netpoll_cleanup(struct net_device *dev) 1077 { 1078 struct macvlan_dev *vlan = netdev_priv(dev); 1079 struct netpoll *netpoll = vlan->netpoll; 1080 1081 if (!netpoll) 1082 return; 1083 1084 vlan->netpoll = NULL; 1085 1086 __netpoll_free_async(netpoll); 1087 } 1088 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1089 1090 static int macvlan_dev_get_iflink(const struct net_device *dev) 1091 { 1092 struct macvlan_dev *vlan = netdev_priv(dev); 1093 1094 return vlan->lowerdev->ifindex; 1095 } 1096 1097 static const struct ethtool_ops macvlan_ethtool_ops = { 1098 .get_link = ethtool_op_get_link, 1099 .get_link_ksettings = macvlan_ethtool_get_link_ksettings, 1100 .get_drvinfo = macvlan_ethtool_get_drvinfo, 1101 }; 1102 1103 static const struct net_device_ops macvlan_netdev_ops = { 1104 .ndo_init = macvlan_init, 1105 .ndo_uninit = macvlan_uninit, 1106 .ndo_open = macvlan_open, 1107 .ndo_stop = macvlan_stop, 1108 .ndo_start_xmit = macvlan_start_xmit, 1109 .ndo_change_mtu = macvlan_change_mtu, 1110 .ndo_fix_features = macvlan_fix_features, 1111 .ndo_change_rx_flags = macvlan_change_rx_flags, 1112 .ndo_set_mac_address = macvlan_set_mac_address, 1113 .ndo_set_rx_mode = macvlan_set_mac_lists, 1114 .ndo_get_stats64 = macvlan_dev_get_stats64, 1115 .ndo_validate_addr = eth_validate_addr, 1116 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, 1117 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, 1118 .ndo_fdb_add = macvlan_fdb_add, 1119 .ndo_fdb_del = macvlan_fdb_del, 1120 .ndo_fdb_dump = ndo_dflt_fdb_dump, 1121 .ndo_get_lock_subclass = macvlan_get_nest_level, 1122 #ifdef CONFIG_NET_POLL_CONTROLLER 1123 .ndo_poll_controller = macvlan_dev_poll_controller, 1124 .ndo_netpoll_setup = macvlan_dev_netpoll_setup, 1125 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, 1126 #endif 1127 .ndo_get_iflink = macvlan_dev_get_iflink, 1128 .ndo_features_check = passthru_features_check, 1129 }; 1130 1131 void macvlan_common_setup(struct net_device *dev) 1132 { 1133 ether_setup(dev); 1134 1135 dev->min_mtu = 0; 1136 dev->max_mtu = ETH_MAX_MTU; 1137 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1138 netif_keep_dst(dev); 1139 dev->priv_flags |= IFF_UNICAST_FLT; 1140 dev->netdev_ops = &macvlan_netdev_ops; 1141 dev->needs_free_netdev = true; 1142 dev->header_ops = &macvlan_hard_header_ops; 1143 dev->ethtool_ops = &macvlan_ethtool_ops; 1144 } 1145 EXPORT_SYMBOL_GPL(macvlan_common_setup); 1146 1147 static void macvlan_setup(struct net_device *dev) 1148 { 1149 macvlan_common_setup(dev); 1150 dev->priv_flags |= IFF_NO_QUEUE; 1151 } 1152 1153 static int macvlan_port_create(struct net_device *dev) 1154 { 1155 struct macvlan_port *port; 1156 unsigned int i; 1157 int err; 1158 1159 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 1160 return -EINVAL; 1161 1162 if (netdev_is_rx_handler_busy(dev)) 1163 return -EBUSY; 1164 1165 port = kzalloc(sizeof(*port), GFP_KERNEL); 1166 if (port == NULL) 1167 return -ENOMEM; 1168 1169 port->dev = dev; 1170 ether_addr_copy(port->perm_addr, dev->dev_addr); 1171 INIT_LIST_HEAD(&port->vlans); 1172 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1173 INIT_HLIST_HEAD(&port->vlan_hash[i]); 1174 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 1175 INIT_HLIST_HEAD(&port->vlan_source_hash[i]); 1176 1177 skb_queue_head_init(&port->bc_queue); 1178 INIT_WORK(&port->bc_work, macvlan_process_broadcast); 1179 1180 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); 1181 if (err) 1182 kfree(port); 1183 else 1184 dev->priv_flags |= IFF_MACVLAN_PORT; 1185 return err; 1186 } 1187 1188 static void macvlan_port_destroy(struct net_device *dev) 1189 { 1190 struct macvlan_port *port = macvlan_port_get_rtnl(dev); 1191 struct sk_buff *skb; 1192 1193 dev->priv_flags &= ~IFF_MACVLAN_PORT; 1194 netdev_rx_handler_unregister(dev); 1195 1196 /* After this point, no packet can schedule bc_work anymore, 1197 * but we need to cancel it and purge left skbs if any. 1198 */ 1199 cancel_work_sync(&port->bc_work); 1200 1201 while ((skb = __skb_dequeue(&port->bc_queue))) { 1202 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; 1203 1204 if (src) 1205 dev_put(src->dev); 1206 1207 kfree_skb(skb); 1208 } 1209 1210 /* If the lower device address has been changed by passthru 1211 * macvlan, put it back. 1212 */ 1213 if (macvlan_passthru(port) && 1214 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { 1215 struct sockaddr sa; 1216 1217 sa.sa_family = port->dev->type; 1218 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len); 1219 dev_set_mac_address(port->dev, &sa); 1220 } 1221 1222 kfree(port); 1223 } 1224 1225 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[], 1226 struct netlink_ext_ack *extack) 1227 { 1228 if (tb[IFLA_ADDRESS]) { 1229 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1230 return -EINVAL; 1231 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1232 return -EADDRNOTAVAIL; 1233 } 1234 1235 if (!data) 1236 return 0; 1237 1238 if (data[IFLA_MACVLAN_FLAGS] && 1239 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) 1240 return -EINVAL; 1241 1242 if (data[IFLA_MACVLAN_MODE]) { 1243 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { 1244 case MACVLAN_MODE_PRIVATE: 1245 case MACVLAN_MODE_VEPA: 1246 case MACVLAN_MODE_BRIDGE: 1247 case MACVLAN_MODE_PASSTHRU: 1248 case MACVLAN_MODE_SOURCE: 1249 break; 1250 default: 1251 return -EINVAL; 1252 } 1253 } 1254 1255 if (data[IFLA_MACVLAN_MACADDR_MODE]) { 1256 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { 1257 case MACVLAN_MACADDR_ADD: 1258 case MACVLAN_MACADDR_DEL: 1259 case MACVLAN_MACADDR_FLUSH: 1260 case MACVLAN_MACADDR_SET: 1261 break; 1262 default: 1263 return -EINVAL; 1264 } 1265 } 1266 1267 if (data[IFLA_MACVLAN_MACADDR]) { 1268 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) 1269 return -EINVAL; 1270 1271 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) 1272 return -EADDRNOTAVAIL; 1273 } 1274 1275 if (data[IFLA_MACVLAN_MACADDR_COUNT]) 1276 return -EINVAL; 1277 1278 return 0; 1279 } 1280 1281 /** 1282 * reconfigure list of remote source mac address 1283 * (only for macvlan devices in source mode) 1284 * Note regarding alignment: all netlink data is aligned to 4 Byte, which 1285 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. 1286 */ 1287 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, 1288 struct nlattr *data[]) 1289 { 1290 char *addr = NULL; 1291 int ret, rem, len; 1292 struct nlattr *nla, *head; 1293 struct macvlan_source_entry *entry; 1294 1295 if (data[IFLA_MACVLAN_MACADDR]) 1296 addr = nla_data(data[IFLA_MACVLAN_MACADDR]); 1297 1298 if (mode == MACVLAN_MACADDR_ADD) { 1299 if (!addr) 1300 return -EINVAL; 1301 1302 return macvlan_hash_add_source(vlan, addr); 1303 1304 } else if (mode == MACVLAN_MACADDR_DEL) { 1305 if (!addr) 1306 return -EINVAL; 1307 1308 entry = macvlan_hash_lookup_source(vlan, addr); 1309 if (entry) { 1310 macvlan_hash_del_source(entry); 1311 vlan->macaddr_count--; 1312 } 1313 } else if (mode == MACVLAN_MACADDR_FLUSH) { 1314 macvlan_flush_sources(vlan->port, vlan); 1315 } else if (mode == MACVLAN_MACADDR_SET) { 1316 macvlan_flush_sources(vlan->port, vlan); 1317 1318 if (addr) { 1319 ret = macvlan_hash_add_source(vlan, addr); 1320 if (ret) 1321 return ret; 1322 } 1323 1324 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA]) 1325 return 0; 1326 1327 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); 1328 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); 1329 1330 nla_for_each_attr(nla, head, len, rem) { 1331 if (nla_type(nla) != IFLA_MACVLAN_MACADDR || 1332 nla_len(nla) != ETH_ALEN) 1333 continue; 1334 1335 addr = nla_data(nla); 1336 ret = macvlan_hash_add_source(vlan, addr); 1337 if (ret) 1338 return ret; 1339 } 1340 } else { 1341 return -EINVAL; 1342 } 1343 1344 return 0; 1345 } 1346 1347 int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 1348 struct nlattr *tb[], struct nlattr *data[], 1349 struct netlink_ext_ack *extack) 1350 { 1351 struct macvlan_dev *vlan = netdev_priv(dev); 1352 struct macvlan_port *port; 1353 struct net_device *lowerdev; 1354 int err; 1355 int macmode; 1356 bool create = false; 1357 1358 if (!tb[IFLA_LINK]) 1359 return -EINVAL; 1360 1361 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 1362 if (lowerdev == NULL) 1363 return -ENODEV; 1364 1365 /* When creating macvlans or macvtaps on top of other macvlans - use 1366 * the real device as the lowerdev. 1367 */ 1368 if (netif_is_macvlan(lowerdev)) 1369 lowerdev = macvlan_dev_real_dev(lowerdev); 1370 1371 if (!tb[IFLA_MTU]) 1372 dev->mtu = lowerdev->mtu; 1373 else if (dev->mtu > lowerdev->mtu) 1374 return -EINVAL; 1375 1376 /* MTU range: 68 - lowerdev->max_mtu */ 1377 dev->min_mtu = ETH_MIN_MTU; 1378 dev->max_mtu = lowerdev->max_mtu; 1379 1380 if (!tb[IFLA_ADDRESS]) 1381 eth_hw_addr_random(dev); 1382 1383 if (!macvlan_port_exists(lowerdev)) { 1384 err = macvlan_port_create(lowerdev); 1385 if (err < 0) 1386 return err; 1387 create = true; 1388 } 1389 port = macvlan_port_get_rtnl(lowerdev); 1390 1391 /* Only 1 macvlan device can be created in passthru mode */ 1392 if (macvlan_passthru(port)) { 1393 /* The macvlan port must be not created this time, 1394 * still goto destroy_macvlan_port for readability. 1395 */ 1396 err = -EINVAL; 1397 goto destroy_macvlan_port; 1398 } 1399 1400 vlan->lowerdev = lowerdev; 1401 vlan->dev = dev; 1402 vlan->port = port; 1403 vlan->set_features = MACVLAN_FEATURES; 1404 vlan->nest_level = dev_get_nest_level(lowerdev) + 1; 1405 1406 vlan->mode = MACVLAN_MODE_VEPA; 1407 if (data && data[IFLA_MACVLAN_MODE]) 1408 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1409 1410 if (data && data[IFLA_MACVLAN_FLAGS]) 1411 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1412 1413 if (vlan->mode == MACVLAN_MODE_PASSTHRU) { 1414 if (port->count) { 1415 err = -EINVAL; 1416 goto destroy_macvlan_port; 1417 } 1418 macvlan_set_passthru(port); 1419 eth_hw_addr_inherit(dev, lowerdev); 1420 } 1421 1422 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1423 if (vlan->mode != MACVLAN_MODE_SOURCE) { 1424 err = -EINVAL; 1425 goto destroy_macvlan_port; 1426 } 1427 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1428 err = macvlan_changelink_sources(vlan, macmode, data); 1429 if (err) 1430 goto destroy_macvlan_port; 1431 } 1432 1433 err = register_netdevice(dev); 1434 if (err < 0) 1435 goto destroy_macvlan_port; 1436 1437 dev->priv_flags |= IFF_MACVLAN; 1438 err = netdev_upper_dev_link(lowerdev, dev, extack); 1439 if (err) 1440 goto unregister_netdev; 1441 1442 list_add_tail_rcu(&vlan->list, &port->vlans); 1443 netif_stacked_transfer_operstate(lowerdev, dev); 1444 linkwatch_fire_event(dev); 1445 1446 return 0; 1447 1448 unregister_netdev: 1449 /* macvlan_uninit would free the macvlan port */ 1450 unregister_netdevice(dev); 1451 return err; 1452 destroy_macvlan_port: 1453 /* the macvlan port may be freed by macvlan_uninit when fail to register. 1454 * so we destroy the macvlan port only when it's valid. 1455 */ 1456 if (create && macvlan_port_get_rtnl(lowerdev)) 1457 macvlan_port_destroy(port->dev); 1458 return err; 1459 } 1460 EXPORT_SYMBOL_GPL(macvlan_common_newlink); 1461 1462 static int macvlan_newlink(struct net *src_net, struct net_device *dev, 1463 struct nlattr *tb[], struct nlattr *data[], 1464 struct netlink_ext_ack *extack) 1465 { 1466 return macvlan_common_newlink(src_net, dev, tb, data, extack); 1467 } 1468 1469 void macvlan_dellink(struct net_device *dev, struct list_head *head) 1470 { 1471 struct macvlan_dev *vlan = netdev_priv(dev); 1472 1473 if (vlan->mode == MACVLAN_MODE_SOURCE) 1474 macvlan_flush_sources(vlan->port, vlan); 1475 list_del_rcu(&vlan->list); 1476 unregister_netdevice_queue(dev, head); 1477 netdev_upper_dev_unlink(vlan->lowerdev, dev); 1478 } 1479 EXPORT_SYMBOL_GPL(macvlan_dellink); 1480 1481 static int macvlan_changelink(struct net_device *dev, 1482 struct nlattr *tb[], struct nlattr *data[], 1483 struct netlink_ext_ack *extack) 1484 { 1485 struct macvlan_dev *vlan = netdev_priv(dev); 1486 enum macvlan_mode mode; 1487 bool set_mode = false; 1488 enum macvlan_macaddr_mode macmode; 1489 int ret; 1490 1491 /* Validate mode, but don't set yet: setting flags may fail. */ 1492 if (data && data[IFLA_MACVLAN_MODE]) { 1493 set_mode = true; 1494 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); 1495 /* Passthrough mode can't be set or cleared dynamically */ 1496 if ((mode == MACVLAN_MODE_PASSTHRU) != 1497 (vlan->mode == MACVLAN_MODE_PASSTHRU)) 1498 return -EINVAL; 1499 if (vlan->mode == MACVLAN_MODE_SOURCE && 1500 vlan->mode != mode) 1501 macvlan_flush_sources(vlan->port, vlan); 1502 } 1503 1504 if (data && data[IFLA_MACVLAN_FLAGS]) { 1505 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); 1506 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; 1507 if (macvlan_passthru(vlan->port) && promisc) { 1508 int err; 1509 1510 if (flags & MACVLAN_FLAG_NOPROMISC) 1511 err = dev_set_promiscuity(vlan->lowerdev, -1); 1512 else 1513 err = dev_set_promiscuity(vlan->lowerdev, 1); 1514 if (err < 0) 1515 return err; 1516 } 1517 vlan->flags = flags; 1518 } 1519 if (set_mode) 1520 vlan->mode = mode; 1521 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { 1522 if (vlan->mode != MACVLAN_MODE_SOURCE) 1523 return -EINVAL; 1524 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); 1525 ret = macvlan_changelink_sources(vlan, macmode, data); 1526 if (ret) 1527 return ret; 1528 } 1529 return 0; 1530 } 1531 1532 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) 1533 { 1534 if (vlan->macaddr_count == 0) 1535 return 0; 1536 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ 1537 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); 1538 } 1539 1540 static size_t macvlan_get_size(const struct net_device *dev) 1541 { 1542 struct macvlan_dev *vlan = netdev_priv(dev); 1543 1544 return (0 1545 + nla_total_size(4) /* IFLA_MACVLAN_MODE */ 1546 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ 1547 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ 1548 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ 1549 ); 1550 } 1551 1552 static int macvlan_fill_info_macaddr(struct sk_buff *skb, 1553 const struct macvlan_dev *vlan, 1554 const int i) 1555 { 1556 struct hlist_head *h = &vlan->port->vlan_source_hash[i]; 1557 struct macvlan_source_entry *entry; 1558 1559 hlist_for_each_entry_rcu(entry, h, hlist) { 1560 if (entry->vlan != vlan) 1561 continue; 1562 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) 1563 return 1; 1564 } 1565 return 0; 1566 } 1567 1568 static int macvlan_fill_info(struct sk_buff *skb, 1569 const struct net_device *dev) 1570 { 1571 struct macvlan_dev *vlan = netdev_priv(dev); 1572 int i; 1573 struct nlattr *nest; 1574 1575 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) 1576 goto nla_put_failure; 1577 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) 1578 goto nla_put_failure; 1579 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) 1580 goto nla_put_failure; 1581 if (vlan->macaddr_count > 0) { 1582 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA); 1583 if (nest == NULL) 1584 goto nla_put_failure; 1585 1586 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 1587 if (macvlan_fill_info_macaddr(skb, vlan, i)) 1588 goto nla_put_failure; 1589 } 1590 nla_nest_end(skb, nest); 1591 } 1592 return 0; 1593 1594 nla_put_failure: 1595 return -EMSGSIZE; 1596 } 1597 1598 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { 1599 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, 1600 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, 1601 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, 1602 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, 1603 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, 1604 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, 1605 }; 1606 1607 int macvlan_link_register(struct rtnl_link_ops *ops) 1608 { 1609 /* common fields */ 1610 ops->validate = macvlan_validate; 1611 ops->maxtype = IFLA_MACVLAN_MAX; 1612 ops->policy = macvlan_policy; 1613 ops->changelink = macvlan_changelink; 1614 ops->get_size = macvlan_get_size; 1615 ops->fill_info = macvlan_fill_info; 1616 1617 return rtnl_link_register(ops); 1618 }; 1619 EXPORT_SYMBOL_GPL(macvlan_link_register); 1620 1621 static struct net *macvlan_get_link_net(const struct net_device *dev) 1622 { 1623 return dev_net(macvlan_dev_real_dev(dev)); 1624 } 1625 1626 static struct rtnl_link_ops macvlan_link_ops = { 1627 .kind = "macvlan", 1628 .setup = macvlan_setup, 1629 .newlink = macvlan_newlink, 1630 .dellink = macvlan_dellink, 1631 .get_link_net = macvlan_get_link_net, 1632 .priv_size = sizeof(struct macvlan_dev), 1633 }; 1634 1635 static int macvlan_device_event(struct notifier_block *unused, 1636 unsigned long event, void *ptr) 1637 { 1638 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1639 struct macvlan_dev *vlan, *next; 1640 struct macvlan_port *port; 1641 LIST_HEAD(list_kill); 1642 1643 if (!macvlan_port_exists(dev)) 1644 return NOTIFY_DONE; 1645 1646 port = macvlan_port_get_rtnl(dev); 1647 1648 switch (event) { 1649 case NETDEV_UP: 1650 case NETDEV_CHANGE: 1651 list_for_each_entry(vlan, &port->vlans, list) 1652 netif_stacked_transfer_operstate(vlan->lowerdev, 1653 vlan->dev); 1654 break; 1655 case NETDEV_FEAT_CHANGE: 1656 list_for_each_entry(vlan, &port->vlans, list) { 1657 vlan->dev->gso_max_size = dev->gso_max_size; 1658 vlan->dev->gso_max_segs = dev->gso_max_segs; 1659 netdev_update_features(vlan->dev); 1660 } 1661 break; 1662 case NETDEV_CHANGEMTU: 1663 list_for_each_entry(vlan, &port->vlans, list) { 1664 if (vlan->dev->mtu <= dev->mtu) 1665 continue; 1666 dev_set_mtu(vlan->dev, dev->mtu); 1667 } 1668 break; 1669 case NETDEV_CHANGEADDR: 1670 if (!macvlan_passthru(port)) 1671 return NOTIFY_DONE; 1672 1673 vlan = list_first_entry_or_null(&port->vlans, 1674 struct macvlan_dev, 1675 list); 1676 1677 if (macvlan_sync_address(vlan->dev, dev->dev_addr)) 1678 return NOTIFY_BAD; 1679 1680 break; 1681 case NETDEV_UNREGISTER: 1682 /* twiddle thumbs on netns device moves */ 1683 if (dev->reg_state != NETREG_UNREGISTERING) 1684 break; 1685 1686 list_for_each_entry_safe(vlan, next, &port->vlans, list) 1687 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); 1688 unregister_netdevice_many(&list_kill); 1689 break; 1690 case NETDEV_PRE_TYPE_CHANGE: 1691 /* Forbid underlaying device to change its type. */ 1692 return NOTIFY_BAD; 1693 1694 case NETDEV_NOTIFY_PEERS: 1695 case NETDEV_BONDING_FAILOVER: 1696 case NETDEV_RESEND_IGMP: 1697 /* Propagate to all vlans */ 1698 list_for_each_entry(vlan, &port->vlans, list) 1699 call_netdevice_notifiers(event, vlan->dev); 1700 } 1701 return NOTIFY_DONE; 1702 } 1703 1704 static struct notifier_block macvlan_notifier_block __read_mostly = { 1705 .notifier_call = macvlan_device_event, 1706 }; 1707 1708 static int __init macvlan_init_module(void) 1709 { 1710 int err; 1711 1712 register_netdevice_notifier(&macvlan_notifier_block); 1713 1714 err = macvlan_link_register(&macvlan_link_ops); 1715 if (err < 0) 1716 goto err1; 1717 return 0; 1718 err1: 1719 unregister_netdevice_notifier(&macvlan_notifier_block); 1720 return err; 1721 } 1722 1723 static void __exit macvlan_cleanup_module(void) 1724 { 1725 rtnl_link_unregister(&macvlan_link_ops); 1726 unregister_netdevice_notifier(&macvlan_notifier_block); 1727 } 1728 1729 module_init(macvlan_init_module); 1730 module_exit(macvlan_cleanup_module); 1731 1732 MODULE_LICENSE("GPL"); 1733 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1734 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 1735 MODULE_ALIAS_RTNL_LINK("macvlan"); 1736