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
  45struct 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
  58struct 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
  65struct 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
  71static void macvlan_port_destroy(struct net_device *dev);
  72
  73static inline bool macvlan_passthru(const struct macvlan_port *port)
  74{
  75	return port->flags & MACVLAN_F_PASSTHRU;
  76}
  77
  78static inline void macvlan_set_passthru(struct macvlan_port *port)
  79{
  80	port->flags |= MACVLAN_F_PASSTHRU;
  81}
  82
  83static inline bool macvlan_addr_change(const struct macvlan_port *port)
  84{
  85	return port->flags & MACVLAN_F_ADDRCHANGE;
  86}
  87
  88static inline void macvlan_set_addr_change(struct macvlan_port *port)
  89{
  90	port->flags |= MACVLAN_F_ADDRCHANGE;
  91}
  92
  93static inline void macvlan_clear_addr_change(struct macvlan_port *port)
  94{
  95	port->flags &= ~MACVLAN_F_ADDRCHANGE;
  96}
  97
  98/* Hash Ethernet address */
  99static 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
 112static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
 113{
 114	return rcu_dereference(dev->rx_handler_data);
 115}
 116
 117static 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
 124static 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
 137static 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
 153static 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
 177static 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
 186static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
 187{
 188	hlist_del_rcu(&entry->hlist);
 189	kfree_rcu(entry, rcu);
 190}
 191
 192static 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
 199static 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
 210static 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
 228static 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
 246static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 247{
 248	return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 249}
 250
 251
 252static 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
 261static 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
 298static 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
 344static 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
 372free_nskb:
 373	kfree_skb(nskb);
 374err:
 375	atomic_long_inc(&skb->dev->rx_dropped);
 376}
 377
 378static 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
 398static 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
 424static 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 */
 439static 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;
 507out:
 508	macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 509	return handle_res;
 510}
 511
 512static 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
 518	if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 519		const struct ethhdr *eth = (void *)skb->data;
 520
 521		/* send to other bridge ports directly */
 522		if (is_multicast_ether_addr(eth->h_dest)) {
 523			macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 524			goto xmit_world;
 525		}
 526
 527		dest = macvlan_hash_lookup(port, eth->h_dest);
 528		if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 529			/* send to lowerdev first for its network taps */
 530			dev_forward_skb(vlan->lowerdev, skb);
 531
 532			return NET_XMIT_SUCCESS;
 533		}
 534	}
 535
 536xmit_world:
 537	skb->dev = vlan->lowerdev;
 538	return dev_queue_xmit(skb);
 539}
 540
 541static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 542{
 543#ifdef CONFIG_NET_POLL_CONTROLLER
 544	if (vlan->netpoll)
 545		netpoll_send_skb(vlan->netpoll, skb);
 546#else
 547	BUG();
 548#endif
 549	return NETDEV_TX_OK;
 550}
 551
 552static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 553				      struct net_device *dev)
 554{
 555	unsigned int len = skb->len;
 556	int ret;
 557	struct macvlan_dev *vlan = netdev_priv(dev);
 558
 559	if (unlikely(netpoll_tx_running(dev)))
 560		return macvlan_netpoll_send_skb(vlan, skb);
 561
 562	if (vlan->fwd_priv) {
 563		skb->dev = vlan->lowerdev;
 564		ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
 565	} else {
 566		ret = macvlan_queue_xmit(skb, dev);
 567	}
 568
 569	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 570		struct vlan_pcpu_stats *pcpu_stats;
 571
 572		pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 573		u64_stats_update_begin(&pcpu_stats->syncp);
 574		pcpu_stats->tx_packets++;
 575		pcpu_stats->tx_bytes += len;
 576		u64_stats_update_end(&pcpu_stats->syncp);
 577	} else {
 578		this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 579	}
 580	return ret;
 581}
 582
 583static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 584			       unsigned short type, const void *daddr,
 585			       const void *saddr, unsigned len)
 586{
 587	const struct macvlan_dev *vlan = netdev_priv(dev);
 588	struct net_device *lowerdev = vlan->lowerdev;
 589
 590	return dev_hard_header(skb, lowerdev, type, daddr,
 591			       saddr ? : dev->dev_addr, len);
 592}
 593
 594static const struct header_ops macvlan_hard_header_ops = {
 595	.create  	= macvlan_hard_header,
 596	.parse		= eth_header_parse,
 597	.cache		= eth_header_cache,
 598	.cache_update	= eth_header_cache_update,
 599};
 600
 
 
 601static int macvlan_open(struct net_device *dev)
 602{
 603	struct macvlan_dev *vlan = netdev_priv(dev);
 604	struct net_device *lowerdev = vlan->lowerdev;
 605	int err;
 606
 607	if (macvlan_passthru(vlan->port)) {
 608		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 609			err = dev_set_promiscuity(lowerdev, 1);
 610			if (err < 0)
 611				goto out;
 612		}
 613		goto hash_add;
 614	}
 615
 616	if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) {
 
 617		vlan->fwd_priv =
 618		      lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 619
 620		/* If we get a NULL pointer back, or if we get an error
 621		 * then we should just fall through to the non accelerated path
 622		 */
 623		if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
 624			vlan->fwd_priv = NULL;
 625		} else
 626			return 0;
 627	}
 628
 629	err = -EBUSY;
 630	if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 631		goto out;
 632
 633	err = dev_uc_add(lowerdev, dev->dev_addr);
 634	if (err < 0)
 635		goto out;
 636	if (dev->flags & IFF_ALLMULTI) {
 637		err = dev_set_allmulti(lowerdev, 1);
 638		if (err < 0)
 639			goto del_unicast;
 640	}
 641
 642	if (dev->flags & IFF_PROMISC) {
 643		err = dev_set_promiscuity(lowerdev, 1);
 644		if (err < 0)
 645			goto clear_multi;
 646	}
 647
 648hash_add:
 649	macvlan_hash_add(vlan);
 650	return 0;
 651
 652clear_multi:
 653	if (dev->flags & IFF_ALLMULTI)
 654		dev_set_allmulti(lowerdev, -1);
 655del_unicast:
 656	dev_uc_del(lowerdev, dev->dev_addr);
 657out:
 658	if (vlan->fwd_priv) {
 659		lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 660							   vlan->fwd_priv);
 661		vlan->fwd_priv = NULL;
 662	}
 663	return err;
 664}
 665
 666static int macvlan_stop(struct net_device *dev)
 667{
 668	struct macvlan_dev *vlan = netdev_priv(dev);
 669	struct net_device *lowerdev = vlan->lowerdev;
 670
 671	if (vlan->fwd_priv) {
 672		lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 673							   vlan->fwd_priv);
 674		vlan->fwd_priv = NULL;
 675		return 0;
 676	}
 677
 678	dev_uc_unsync(lowerdev, dev);
 679	dev_mc_unsync(lowerdev, dev);
 680
 681	if (macvlan_passthru(vlan->port)) {
 682		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 683			dev_set_promiscuity(lowerdev, -1);
 684		goto hash_del;
 685	}
 686
 687	if (dev->flags & IFF_ALLMULTI)
 688		dev_set_allmulti(lowerdev, -1);
 689
 690	if (dev->flags & IFF_PROMISC)
 691		dev_set_promiscuity(lowerdev, -1);
 692
 693	dev_uc_del(lowerdev, dev->dev_addr);
 694
 695hash_del:
 696	macvlan_hash_del(vlan, !dev->dismantle);
 697	return 0;
 698}
 699
 700static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 701{
 702	struct macvlan_dev *vlan = netdev_priv(dev);
 703	struct net_device *lowerdev = vlan->lowerdev;
 704	struct macvlan_port *port = vlan->port;
 705	int err;
 706
 707	if (!(dev->flags & IFF_UP)) {
 708		/* Just copy in the new address */
 709		ether_addr_copy(dev->dev_addr, addr);
 710	} else {
 711		/* Rehash and update the device filters */
 712		if (macvlan_addr_busy(vlan->port, addr))
 713			return -EBUSY;
 714
 715		if (!macvlan_passthru(port)) {
 716			err = dev_uc_add(lowerdev, addr);
 717			if (err)
 718				return err;
 719
 720			dev_uc_del(lowerdev, dev->dev_addr);
 721		}
 722
 723		macvlan_hash_change_addr(vlan, addr);
 724	}
 725	if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 726		/* Since addr_change isn't set, we are here due to lower
 727		 * device change.  Save the lower-dev address so we can
 728		 * restore it later.
 729		 */
 730		ether_addr_copy(vlan->port->perm_addr,
 731				lowerdev->dev_addr);
 732	}
 733	macvlan_clear_addr_change(port);
 734	return 0;
 735}
 736
 737static int macvlan_set_mac_address(struct net_device *dev, void *p)
 738{
 739	struct macvlan_dev *vlan = netdev_priv(dev);
 740	struct sockaddr *addr = p;
 741
 742	if (!is_valid_ether_addr(addr->sa_data))
 743		return -EADDRNOTAVAIL;
 744
 745	/* If the addresses are the same, this is a no-op */
 746	if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 747		return 0;
 748
 749	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 750		macvlan_set_addr_change(vlan->port);
 751		return dev_set_mac_address(vlan->lowerdev, addr);
 752	}
 753
 754	return macvlan_sync_address(dev, addr->sa_data);
 755}
 756
 757static void macvlan_change_rx_flags(struct net_device *dev, int change)
 758{
 759	struct macvlan_dev *vlan = netdev_priv(dev);
 760	struct net_device *lowerdev = vlan->lowerdev;
 761
 762	if (dev->flags & IFF_UP) {
 763		if (change & IFF_ALLMULTI)
 764			dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 765		if (change & IFF_PROMISC)
 766			dev_set_promiscuity(lowerdev,
 767					    dev->flags & IFF_PROMISC ? 1 : -1);
 768
 769	}
 770}
 771
 772static void macvlan_compute_filter(unsigned long *mc_filter,
 773				   struct net_device *dev,
 774				   struct macvlan_dev *vlan)
 775{
 
 
 776	if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 777		bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 778	} else {
 779		struct netdev_hw_addr *ha;
 780		DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 781
 782		bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 783		netdev_for_each_mc_addr(ha, dev) {
 784			__set_bit(mc_hash(vlan, ha->addr), filter);
 785		}
 786
 787		__set_bit(mc_hash(vlan, dev->broadcast), filter);
 788
 789		bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 790	}
 791}
 792
 793static void macvlan_set_mac_lists(struct net_device *dev)
 794{
 795	struct macvlan_dev *vlan = netdev_priv(dev);
 796
 797	macvlan_compute_filter(vlan->mc_filter, dev, vlan);
 798
 799	dev_uc_sync(vlan->lowerdev, dev);
 800	dev_mc_sync(vlan->lowerdev, dev);
 801
 802	/* This is slightly inaccurate as we're including the subscription
 803	 * list of vlan->lowerdev too.
 804	 *
 805	 * Bug alert: This only works if everyone has the same broadcast
 806	 * address as lowerdev.  As soon as someone changes theirs this
 807	 * will break.
 808	 *
 809	 * However, this is already broken as when you change your broadcast
 810	 * address we don't get called.
 811	 *
 812	 * The solution is to maintain a list of broadcast addresses like
 813	 * we do for uc/mc, if you care.
 814	 */
 815	macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
 816}
 817
 818static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 819{
 820	struct macvlan_dev *vlan = netdev_priv(dev);
 821
 822	if (vlan->lowerdev->mtu < new_mtu)
 823		return -EINVAL;
 824	dev->mtu = new_mtu;
 825	return 0;
 826}
 827
 828/*
 829 * macvlan network devices have devices nesting below it and are a special
 830 * "super class" of normal network devices; split their locks off into a
 831 * separate class since they always nest.
 832 */
 
 833static struct lock_class_key macvlan_netdev_addr_lock_key;
 834
 835#define ALWAYS_ON_OFFLOADS \
 836	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 837	 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 838
 839#define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 840
 841#define MACVLAN_FEATURES \
 842	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 843	 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 844	 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 845	 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 846
 847#define MACVLAN_STATE_MASK \
 848	((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 849
 850static int macvlan_get_nest_level(struct net_device *dev)
 851{
 852	return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
 853}
 854
 
 
 
 
 
 
 
 
 855static void macvlan_set_lockdep_class(struct net_device *dev)
 856{
 857	netdev_lockdep_set_classes(dev);
 858	lockdep_set_class_and_subclass(&dev->addr_list_lock,
 859				       &macvlan_netdev_addr_lock_key,
 860				       macvlan_get_nest_level(dev));
 
 861}
 862
 863static int macvlan_init(struct net_device *dev)
 864{
 865	struct macvlan_dev *vlan = netdev_priv(dev);
 866	const struct net_device *lowerdev = vlan->lowerdev;
 867	struct macvlan_port *port = vlan->port;
 868
 869	dev->state		= (dev->state & ~MACVLAN_STATE_MASK) |
 870				  (lowerdev->state & MACVLAN_STATE_MASK);
 871	dev->features 		= lowerdev->features & MACVLAN_FEATURES;
 872	dev->features		|= ALWAYS_ON_FEATURES;
 873	dev->hw_features	|= NETIF_F_LRO;
 874	dev->vlan_features	= lowerdev->vlan_features & MACVLAN_FEATURES;
 875	dev->vlan_features	|= ALWAYS_ON_OFFLOADS;
 876	dev->hw_enc_features    |= dev->features;
 877	dev->gso_max_size	= lowerdev->gso_max_size;
 878	dev->gso_max_segs	= lowerdev->gso_max_segs;
 879	dev->hard_header_len	= lowerdev->hard_header_len;
 880
 881	macvlan_set_lockdep_class(dev);
 882
 883	vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 884	if (!vlan->pcpu_stats)
 885		return -ENOMEM;
 886
 887	port->count += 1;
 888
 889	return 0;
 890}
 891
 892static void macvlan_uninit(struct net_device *dev)
 893{
 894	struct macvlan_dev *vlan = netdev_priv(dev);
 895	struct macvlan_port *port = vlan->port;
 896
 897	free_percpu(vlan->pcpu_stats);
 898
 899	macvlan_flush_sources(port, vlan);
 900	port->count -= 1;
 901	if (!port->count)
 902		macvlan_port_destroy(port->dev);
 903}
 904
 905static void macvlan_dev_get_stats64(struct net_device *dev,
 906				    struct rtnl_link_stats64 *stats)
 907{
 908	struct macvlan_dev *vlan = netdev_priv(dev);
 909
 910	if (vlan->pcpu_stats) {
 911		struct vlan_pcpu_stats *p;
 912		u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 913		u32 rx_errors = 0, tx_dropped = 0;
 914		unsigned int start;
 915		int i;
 916
 917		for_each_possible_cpu(i) {
 918			p = per_cpu_ptr(vlan->pcpu_stats, i);
 919			do {
 920				start = u64_stats_fetch_begin_irq(&p->syncp);
 921				rx_packets	= p->rx_packets;
 922				rx_bytes	= p->rx_bytes;
 923				rx_multicast	= p->rx_multicast;
 924				tx_packets	= p->tx_packets;
 925				tx_bytes	= p->tx_bytes;
 926			} while (u64_stats_fetch_retry_irq(&p->syncp, start));
 927
 928			stats->rx_packets	+= rx_packets;
 929			stats->rx_bytes		+= rx_bytes;
 930			stats->multicast	+= rx_multicast;
 931			stats->tx_packets	+= tx_packets;
 932			stats->tx_bytes		+= tx_bytes;
 933			/* rx_errors & tx_dropped are u32, updated
 934			 * without syncp protection.
 935			 */
 936			rx_errors	+= p->rx_errors;
 937			tx_dropped	+= p->tx_dropped;
 938		}
 939		stats->rx_errors	= rx_errors;
 940		stats->rx_dropped	= rx_errors;
 941		stats->tx_dropped	= tx_dropped;
 942	}
 
 943}
 944
 945static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 946				   __be16 proto, u16 vid)
 947{
 948	struct macvlan_dev *vlan = netdev_priv(dev);
 949	struct net_device *lowerdev = vlan->lowerdev;
 950
 951	return vlan_vid_add(lowerdev, proto, vid);
 952}
 953
 954static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 955				    __be16 proto, u16 vid)
 956{
 957	struct macvlan_dev *vlan = netdev_priv(dev);
 958	struct net_device *lowerdev = vlan->lowerdev;
 959
 960	vlan_vid_del(lowerdev, proto, vid);
 961	return 0;
 962}
 963
 964static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 965			   struct net_device *dev,
 966			   const unsigned char *addr, u16 vid,
 967			   u16 flags)
 968{
 969	struct macvlan_dev *vlan = netdev_priv(dev);
 970	int err = -EINVAL;
 971
 972	/* Support unicast filter only on passthru devices.
 973	 * Multicast filter should be allowed on all devices.
 974	 */
 975	if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
 976		return -EOPNOTSUPP;
 977
 978	if (flags & NLM_F_REPLACE)
 979		return -EOPNOTSUPP;
 980
 981	if (is_unicast_ether_addr(addr))
 982		err = dev_uc_add_excl(dev, addr);
 983	else if (is_multicast_ether_addr(addr))
 984		err = dev_mc_add_excl(dev, addr);
 985
 986	return err;
 987}
 988
 989static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 990			   struct net_device *dev,
 991			   const unsigned char *addr, u16 vid)
 992{
 993	struct macvlan_dev *vlan = netdev_priv(dev);
 994	int err = -EINVAL;
 995
 996	/* Support unicast filter only on passthru devices.
 997	 * Multicast filter should be allowed on all devices.
 998	 */
 999	if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1000		return -EOPNOTSUPP;
1001
1002	if (is_unicast_ether_addr(addr))
1003		err = dev_uc_del(dev, addr);
1004	else if (is_multicast_ether_addr(addr))
1005		err = dev_mc_del(dev, addr);
1006
1007	return err;
1008}
1009
1010static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1011					struct ethtool_drvinfo *drvinfo)
1012{
1013	strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1014	strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1015}
1016
1017static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1018					      struct ethtool_link_ksettings *cmd)
1019{
1020	const struct macvlan_dev *vlan = netdev_priv(dev);
1021
1022	return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1023}
1024
1025static netdev_features_t macvlan_fix_features(struct net_device *dev,
1026					      netdev_features_t features)
1027{
1028	struct macvlan_dev *vlan = netdev_priv(dev);
1029	netdev_features_t lowerdev_features = vlan->lowerdev->features;
1030	netdev_features_t mask;
1031
1032	features |= NETIF_F_ALL_FOR_ALL;
1033	features &= (vlan->set_features | ~MACVLAN_FEATURES);
1034	mask = features;
1035
1036	lowerdev_features &= (features | ~NETIF_F_LRO);
1037	features = netdev_increment_features(lowerdev_features, features, mask);
1038	features |= ALWAYS_ON_FEATURES;
1039	features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1040
1041	return features;
1042}
1043
1044#ifdef CONFIG_NET_POLL_CONTROLLER
1045static void macvlan_dev_poll_controller(struct net_device *dev)
1046{
1047	return;
1048}
1049
1050static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1051{
1052	struct macvlan_dev *vlan = netdev_priv(dev);
1053	struct net_device *real_dev = vlan->lowerdev;
1054	struct netpoll *netpoll;
1055	int err = 0;
1056
1057	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1058	err = -ENOMEM;
1059	if (!netpoll)
1060		goto out;
1061
1062	err = __netpoll_setup(netpoll, real_dev);
1063	if (err) {
1064		kfree(netpoll);
1065		goto out;
1066	}
1067
1068	vlan->netpoll = netpoll;
1069
1070out:
1071	return err;
1072}
1073
1074static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1075{
1076	struct macvlan_dev *vlan = netdev_priv(dev);
1077	struct netpoll *netpoll = vlan->netpoll;
1078
1079	if (!netpoll)
1080		return;
1081
1082	vlan->netpoll = NULL;
1083
1084	__netpoll_free_async(netpoll);
1085}
1086#endif	/* CONFIG_NET_POLL_CONTROLLER */
1087
1088static int macvlan_dev_get_iflink(const struct net_device *dev)
1089{
1090	struct macvlan_dev *vlan = netdev_priv(dev);
1091
1092	return vlan->lowerdev->ifindex;
1093}
1094
1095static const struct ethtool_ops macvlan_ethtool_ops = {
1096	.get_link		= ethtool_op_get_link,
1097	.get_link_ksettings	= macvlan_ethtool_get_link_ksettings,
1098	.get_drvinfo		= macvlan_ethtool_get_drvinfo,
1099};
1100
1101static const struct net_device_ops macvlan_netdev_ops = {
1102	.ndo_init		= macvlan_init,
1103	.ndo_uninit		= macvlan_uninit,
1104	.ndo_open		= macvlan_open,
1105	.ndo_stop		= macvlan_stop,
1106	.ndo_start_xmit		= macvlan_start_xmit,
1107	.ndo_change_mtu		= macvlan_change_mtu,
1108	.ndo_fix_features	= macvlan_fix_features,
1109	.ndo_change_rx_flags	= macvlan_change_rx_flags,
1110	.ndo_set_mac_address	= macvlan_set_mac_address,
1111	.ndo_set_rx_mode	= macvlan_set_mac_lists,
1112	.ndo_get_stats64	= macvlan_dev_get_stats64,
1113	.ndo_validate_addr	= eth_validate_addr,
1114	.ndo_vlan_rx_add_vid	= macvlan_vlan_rx_add_vid,
1115	.ndo_vlan_rx_kill_vid	= macvlan_vlan_rx_kill_vid,
1116	.ndo_fdb_add		= macvlan_fdb_add,
1117	.ndo_fdb_del		= macvlan_fdb_del,
1118	.ndo_fdb_dump		= ndo_dflt_fdb_dump,
1119	.ndo_get_lock_subclass  = macvlan_get_nest_level,
1120#ifdef CONFIG_NET_POLL_CONTROLLER
1121	.ndo_poll_controller	= macvlan_dev_poll_controller,
1122	.ndo_netpoll_setup	= macvlan_dev_netpoll_setup,
1123	.ndo_netpoll_cleanup	= macvlan_dev_netpoll_cleanup,
1124#endif
1125	.ndo_get_iflink		= macvlan_dev_get_iflink,
1126	.ndo_features_check	= passthru_features_check,
1127};
1128
1129void macvlan_common_setup(struct net_device *dev)
1130{
1131	ether_setup(dev);
1132
1133	dev->min_mtu		= 0;
1134	dev->max_mtu		= ETH_MAX_MTU;
1135	dev->priv_flags	       &= ~IFF_TX_SKB_SHARING;
1136	netif_keep_dst(dev);
1137	dev->priv_flags	       |= IFF_UNICAST_FLT;
1138	dev->netdev_ops		= &macvlan_netdev_ops;
1139	dev->needs_free_netdev	= true;
1140	dev->header_ops		= &macvlan_hard_header_ops;
1141	dev->ethtool_ops	= &macvlan_ethtool_ops;
1142}
1143EXPORT_SYMBOL_GPL(macvlan_common_setup);
1144
1145static void macvlan_setup(struct net_device *dev)
1146{
1147	macvlan_common_setup(dev);
1148	dev->priv_flags |= IFF_NO_QUEUE;
1149}
1150
1151static int macvlan_port_create(struct net_device *dev)
1152{
1153	struct macvlan_port *port;
1154	unsigned int i;
1155	int err;
1156
1157	if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1158		return -EINVAL;
1159
1160	if (netdev_is_rx_handler_busy(dev))
1161		return -EBUSY;
1162
1163	port = kzalloc(sizeof(*port), GFP_KERNEL);
1164	if (port == NULL)
1165		return -ENOMEM;
1166
 
1167	port->dev = dev;
1168	ether_addr_copy(port->perm_addr, dev->dev_addr);
1169	INIT_LIST_HEAD(&port->vlans);
1170	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1171		INIT_HLIST_HEAD(&port->vlan_hash[i]);
1172	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1173		INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1174
1175	skb_queue_head_init(&port->bc_queue);
1176	INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1177
1178	err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1179	if (err)
1180		kfree(port);
1181	else
1182		dev->priv_flags |= IFF_MACVLAN_PORT;
1183	return err;
1184}
1185
1186static void macvlan_port_destroy(struct net_device *dev)
1187{
1188	struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1189	struct sk_buff *skb;
1190
1191	dev->priv_flags &= ~IFF_MACVLAN_PORT;
1192	netdev_rx_handler_unregister(dev);
1193
1194	/* After this point, no packet can schedule bc_work anymore,
1195	 * but we need to cancel it and purge left skbs if any.
1196	 */
1197	cancel_work_sync(&port->bc_work);
 
1198
1199	while ((skb = __skb_dequeue(&port->bc_queue))) {
1200		const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1201
1202		if (src)
1203			dev_put(src->dev);
1204
1205		kfree_skb(skb);
1206	}
1207
1208	/* If the lower device address has been changed by passthru
1209	 * macvlan, put it back.
1210	 */
1211	if (macvlan_passthru(port) &&
1212	    !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1213		struct sockaddr sa;
1214
1215		sa.sa_family = port->dev->type;
1216		memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1217		dev_set_mac_address(port->dev, &sa);
1218	}
1219
1220	kfree(port);
1221}
1222
1223static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1224			    struct netlink_ext_ack *extack)
1225{
1226	if (tb[IFLA_ADDRESS]) {
1227		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1228			return -EINVAL;
1229		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1230			return -EADDRNOTAVAIL;
1231	}
1232
1233	if (!data)
1234		return 0;
1235
1236	if (data[IFLA_MACVLAN_FLAGS] &&
1237	    nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1238		return -EINVAL;
1239
1240	if (data[IFLA_MACVLAN_MODE]) {
1241		switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1242		case MACVLAN_MODE_PRIVATE:
1243		case MACVLAN_MODE_VEPA:
1244		case MACVLAN_MODE_BRIDGE:
1245		case MACVLAN_MODE_PASSTHRU:
1246		case MACVLAN_MODE_SOURCE:
1247			break;
1248		default:
1249			return -EINVAL;
1250		}
1251	}
1252
1253	if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1254		switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1255		case MACVLAN_MACADDR_ADD:
1256		case MACVLAN_MACADDR_DEL:
1257		case MACVLAN_MACADDR_FLUSH:
1258		case MACVLAN_MACADDR_SET:
1259			break;
1260		default:
1261			return -EINVAL;
1262		}
1263	}
1264
1265	if (data[IFLA_MACVLAN_MACADDR]) {
1266		if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1267			return -EINVAL;
1268
1269		if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1270			return -EADDRNOTAVAIL;
1271	}
1272
1273	if (data[IFLA_MACVLAN_MACADDR_COUNT])
1274		return -EINVAL;
1275
1276	return 0;
1277}
1278
1279/**
1280 * reconfigure list of remote source mac address
1281 * (only for macvlan devices in source mode)
1282 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1283 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1284 */
1285static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1286				      struct nlattr *data[])
1287{
1288	char *addr = NULL;
1289	int ret, rem, len;
1290	struct nlattr *nla, *head;
1291	struct macvlan_source_entry *entry;
1292
1293	if (data[IFLA_MACVLAN_MACADDR])
1294		addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1295
1296	if (mode == MACVLAN_MACADDR_ADD) {
1297		if (!addr)
1298			return -EINVAL;
1299
1300		return macvlan_hash_add_source(vlan, addr);
1301
1302	} else if (mode == MACVLAN_MACADDR_DEL) {
1303		if (!addr)
1304			return -EINVAL;
1305
1306		entry = macvlan_hash_lookup_source(vlan, addr);
1307		if (entry) {
1308			macvlan_hash_del_source(entry);
1309			vlan->macaddr_count--;
1310		}
1311	} else if (mode == MACVLAN_MACADDR_FLUSH) {
1312		macvlan_flush_sources(vlan->port, vlan);
1313	} else if (mode == MACVLAN_MACADDR_SET) {
1314		macvlan_flush_sources(vlan->port, vlan);
1315
1316		if (addr) {
1317			ret = macvlan_hash_add_source(vlan, addr);
1318			if (ret)
1319				return ret;
1320		}
1321
1322		if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1323			return 0;
1324
1325		head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1326		len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1327
1328		nla_for_each_attr(nla, head, len, rem) {
1329			if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1330			    nla_len(nla) != ETH_ALEN)
1331				continue;
1332
1333			addr = nla_data(nla);
1334			ret = macvlan_hash_add_source(vlan, addr);
1335			if (ret)
1336				return ret;
1337		}
1338	} else {
1339		return -EINVAL;
1340	}
1341
1342	return 0;
1343}
1344
1345int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1346			   struct nlattr *tb[], struct nlattr *data[],
1347			   struct netlink_ext_ack *extack)
1348{
1349	struct macvlan_dev *vlan = netdev_priv(dev);
1350	struct macvlan_port *port;
1351	struct net_device *lowerdev;
1352	int err;
1353	int macmode;
1354	bool create = false;
1355
1356	if (!tb[IFLA_LINK])
1357		return -EINVAL;
1358
1359	lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1360	if (lowerdev == NULL)
1361		return -ENODEV;
1362
1363	/* When creating macvlans or macvtaps on top of other macvlans - use
1364	 * the real device as the lowerdev.
1365	 */
1366	if (netif_is_macvlan(lowerdev))
1367		lowerdev = macvlan_dev_real_dev(lowerdev);
1368
1369	if (!tb[IFLA_MTU])
1370		dev->mtu = lowerdev->mtu;
1371	else if (dev->mtu > lowerdev->mtu)
1372		return -EINVAL;
1373
1374	/* MTU range: 68 - lowerdev->max_mtu */
1375	dev->min_mtu = ETH_MIN_MTU;
1376	dev->max_mtu = lowerdev->max_mtu;
1377
1378	if (!tb[IFLA_ADDRESS])
1379		eth_hw_addr_random(dev);
1380
1381	if (!macvlan_port_exists(lowerdev)) {
1382		err = macvlan_port_create(lowerdev);
1383		if (err < 0)
1384			return err;
1385		create = true;
1386	}
1387	port = macvlan_port_get_rtnl(lowerdev);
1388
1389	/* Only 1 macvlan device can be created in passthru mode */
1390	if (macvlan_passthru(port)) {
1391		/* The macvlan port must be not created this time,
1392		 * still goto destroy_macvlan_port for readability.
1393		 */
1394		err = -EINVAL;
1395		goto destroy_macvlan_port;
1396	}
1397
1398	vlan->lowerdev = lowerdev;
1399	vlan->dev      = dev;
1400	vlan->port     = port;
1401	vlan->set_features = MACVLAN_FEATURES;
1402	vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1403
1404	vlan->mode     = MACVLAN_MODE_VEPA;
1405	if (data && data[IFLA_MACVLAN_MODE])
1406		vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1407
1408	if (data && data[IFLA_MACVLAN_FLAGS])
1409		vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1410
1411	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1412		if (port->count) {
1413			err = -EINVAL;
1414			goto destroy_macvlan_port;
1415		}
1416		macvlan_set_passthru(port);
1417		eth_hw_addr_inherit(dev, lowerdev);
1418	}
1419
1420	if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1421		if (vlan->mode != MACVLAN_MODE_SOURCE) {
1422			err = -EINVAL;
1423			goto destroy_macvlan_port;
1424		}
1425		macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1426		err = macvlan_changelink_sources(vlan, macmode, data);
1427		if (err)
1428			goto destroy_macvlan_port;
1429	}
1430
 
1431	err = register_netdevice(dev);
1432	if (err < 0)
1433		goto destroy_macvlan_port;
1434
1435	dev->priv_flags |= IFF_MACVLAN;
1436	err = netdev_upper_dev_link(lowerdev, dev, extack);
1437	if (err)
1438		goto unregister_netdev;
1439
1440	list_add_tail_rcu(&vlan->list, &port->vlans);
1441	netif_stacked_transfer_operstate(lowerdev, dev);
1442	linkwatch_fire_event(dev);
1443
1444	return 0;
1445
1446unregister_netdev:
1447	/* macvlan_uninit would free the macvlan port */
1448	unregister_netdevice(dev);
1449	return err;
1450destroy_macvlan_port:
1451	/* the macvlan port may be freed by macvlan_uninit when fail to register.
1452	 * so we destroy the macvlan port only when it's valid.
1453	 */
1454	if (create && macvlan_port_get_rtnl(lowerdev))
1455		macvlan_port_destroy(port->dev);
1456	return err;
1457}
1458EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1459
1460static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1461			   struct nlattr *tb[], struct nlattr *data[],
1462			   struct netlink_ext_ack *extack)
1463{
1464	return macvlan_common_newlink(src_net, dev, tb, data, extack);
1465}
1466
1467void macvlan_dellink(struct net_device *dev, struct list_head *head)
1468{
1469	struct macvlan_dev *vlan = netdev_priv(dev);
1470
1471	if (vlan->mode == MACVLAN_MODE_SOURCE)
1472		macvlan_flush_sources(vlan->port, vlan);
1473	list_del_rcu(&vlan->list);
1474	unregister_netdevice_queue(dev, head);
1475	netdev_upper_dev_unlink(vlan->lowerdev, dev);
1476}
1477EXPORT_SYMBOL_GPL(macvlan_dellink);
1478
1479static int macvlan_changelink(struct net_device *dev,
1480			      struct nlattr *tb[], struct nlattr *data[],
1481			      struct netlink_ext_ack *extack)
1482{
1483	struct macvlan_dev *vlan = netdev_priv(dev);
1484	enum macvlan_mode mode;
1485	bool set_mode = false;
1486	enum macvlan_macaddr_mode macmode;
1487	int ret;
1488
1489	/* Validate mode, but don't set yet: setting flags may fail. */
1490	if (data && data[IFLA_MACVLAN_MODE]) {
1491		set_mode = true;
1492		mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1493		/* Passthrough mode can't be set or cleared dynamically */
1494		if ((mode == MACVLAN_MODE_PASSTHRU) !=
1495		    (vlan->mode == MACVLAN_MODE_PASSTHRU))
1496			return -EINVAL;
1497		if (vlan->mode == MACVLAN_MODE_SOURCE &&
1498		    vlan->mode != mode)
1499			macvlan_flush_sources(vlan->port, vlan);
1500	}
1501
1502	if (data && data[IFLA_MACVLAN_FLAGS]) {
1503		__u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1504		bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1505		if (macvlan_passthru(vlan->port) && promisc) {
1506			int err;
1507
1508			if (flags & MACVLAN_FLAG_NOPROMISC)
1509				err = dev_set_promiscuity(vlan->lowerdev, -1);
1510			else
1511				err = dev_set_promiscuity(vlan->lowerdev, 1);
1512			if (err < 0)
1513				return err;
1514		}
1515		vlan->flags = flags;
1516	}
1517	if (set_mode)
1518		vlan->mode = mode;
1519	if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1520		if (vlan->mode != MACVLAN_MODE_SOURCE)
1521			return -EINVAL;
1522		macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1523		ret = macvlan_changelink_sources(vlan, macmode, data);
1524		if (ret)
1525			return ret;
1526	}
1527	return 0;
1528}
1529
1530static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1531{
1532	if (vlan->macaddr_count == 0)
1533		return 0;
1534	return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1535		+ vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1536}
1537
1538static size_t macvlan_get_size(const struct net_device *dev)
1539{
1540	struct macvlan_dev *vlan = netdev_priv(dev);
1541
1542	return (0
1543		+ nla_total_size(4) /* IFLA_MACVLAN_MODE */
1544		+ nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1545		+ nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1546		+ macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1547		);
1548}
1549
1550static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1551				     const struct macvlan_dev *vlan,
1552				     const int i)
1553{
1554	struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1555	struct macvlan_source_entry *entry;
1556
1557	hlist_for_each_entry_rcu(entry, h, hlist) {
1558		if (entry->vlan != vlan)
1559			continue;
1560		if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1561			return 1;
1562	}
1563	return 0;
1564}
1565
1566static int macvlan_fill_info(struct sk_buff *skb,
1567				const struct net_device *dev)
1568{
1569	struct macvlan_dev *vlan = netdev_priv(dev);
1570	int i;
1571	struct nlattr *nest;
1572
1573	if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1574		goto nla_put_failure;
1575	if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1576		goto nla_put_failure;
1577	if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1578		goto nla_put_failure;
1579	if (vlan->macaddr_count > 0) {
1580		nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1581		if (nest == NULL)
1582			goto nla_put_failure;
1583
1584		for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1585			if (macvlan_fill_info_macaddr(skb, vlan, i))
1586				goto nla_put_failure;
1587		}
1588		nla_nest_end(skb, nest);
1589	}
1590	return 0;
1591
1592nla_put_failure:
1593	return -EMSGSIZE;
1594}
1595
1596static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1597	[IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1598	[IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1599	[IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1600	[IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1601	[IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1602	[IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1603};
1604
1605int macvlan_link_register(struct rtnl_link_ops *ops)
1606{
1607	/* common fields */
 
1608	ops->validate		= macvlan_validate;
1609	ops->maxtype		= IFLA_MACVLAN_MAX;
1610	ops->policy		= macvlan_policy;
1611	ops->changelink		= macvlan_changelink;
1612	ops->get_size		= macvlan_get_size;
1613	ops->fill_info		= macvlan_fill_info;
1614
1615	return rtnl_link_register(ops);
1616};
1617EXPORT_SYMBOL_GPL(macvlan_link_register);
1618
1619static struct net *macvlan_get_link_net(const struct net_device *dev)
1620{
1621	return dev_net(macvlan_dev_real_dev(dev));
1622}
1623
1624static struct rtnl_link_ops macvlan_link_ops = {
1625	.kind		= "macvlan",
1626	.setup		= macvlan_setup,
1627	.newlink	= macvlan_newlink,
1628	.dellink	= macvlan_dellink,
1629	.get_link_net	= macvlan_get_link_net,
1630	.priv_size      = sizeof(struct macvlan_dev),
1631};
1632
1633static int macvlan_device_event(struct notifier_block *unused,
1634				unsigned long event, void *ptr)
1635{
1636	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1637	struct macvlan_dev *vlan, *next;
1638	struct macvlan_port *port;
1639	LIST_HEAD(list_kill);
1640
1641	if (!macvlan_port_exists(dev))
1642		return NOTIFY_DONE;
1643
1644	port = macvlan_port_get_rtnl(dev);
1645
1646	switch (event) {
1647	case NETDEV_UP:
1648	case NETDEV_CHANGE:
1649		list_for_each_entry(vlan, &port->vlans, list)
1650			netif_stacked_transfer_operstate(vlan->lowerdev,
1651							 vlan->dev);
1652		break;
1653	case NETDEV_FEAT_CHANGE:
1654		list_for_each_entry(vlan, &port->vlans, list) {
1655			vlan->dev->gso_max_size = dev->gso_max_size;
1656			vlan->dev->gso_max_segs = dev->gso_max_segs;
1657			netdev_update_features(vlan->dev);
1658		}
1659		break;
1660	case NETDEV_CHANGEMTU:
1661		list_for_each_entry(vlan, &port->vlans, list) {
1662			if (vlan->dev->mtu <= dev->mtu)
1663				continue;
1664			dev_set_mtu(vlan->dev, dev->mtu);
1665		}
1666		break;
1667	case NETDEV_CHANGEADDR:
1668		if (!macvlan_passthru(port))
1669			return NOTIFY_DONE;
1670
1671		vlan = list_first_entry_or_null(&port->vlans,
1672						struct macvlan_dev,
1673						list);
1674
1675		if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1676			return NOTIFY_BAD;
1677
1678		break;
1679	case NETDEV_UNREGISTER:
1680		/* twiddle thumbs on netns device moves */
1681		if (dev->reg_state != NETREG_UNREGISTERING)
1682			break;
1683
1684		list_for_each_entry_safe(vlan, next, &port->vlans, list)
1685			vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1686		unregister_netdevice_many(&list_kill);
1687		break;
1688	case NETDEV_PRE_TYPE_CHANGE:
1689		/* Forbid underlaying device to change its type. */
1690		return NOTIFY_BAD;
1691
1692	case NETDEV_NOTIFY_PEERS:
1693	case NETDEV_BONDING_FAILOVER:
1694	case NETDEV_RESEND_IGMP:
1695		/* Propagate to all vlans */
1696		list_for_each_entry(vlan, &port->vlans, list)
1697			call_netdevice_notifiers(event, vlan->dev);
1698	}
1699	return NOTIFY_DONE;
1700}
1701
1702static struct notifier_block macvlan_notifier_block __read_mostly = {
1703	.notifier_call	= macvlan_device_event,
1704};
1705
1706static int __init macvlan_init_module(void)
1707{
1708	int err;
1709
1710	register_netdevice_notifier(&macvlan_notifier_block);
1711
1712	err = macvlan_link_register(&macvlan_link_ops);
1713	if (err < 0)
1714		goto err1;
1715	return 0;
1716err1:
1717	unregister_netdevice_notifier(&macvlan_notifier_block);
1718	return err;
1719}
1720
1721static void __exit macvlan_cleanup_module(void)
1722{
1723	rtnl_link_unregister(&macvlan_link_ops);
1724	unregister_netdevice_notifier(&macvlan_notifier_block);
1725}
1726
1727module_init(macvlan_init_module);
1728module_exit(macvlan_cleanup_module);
1729
1730MODULE_LICENSE("GPL");
1731MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1732MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1733MODULE_ALIAS_RTNL_LINK("macvlan");