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 <net/rtnetlink.h>
  34#include <net/xfrm.h>
 
 
 
 
 
 
  35
  36#define MACVLAN_HASH_SIZE	(1 << BITS_PER_BYTE)
 
  37
  38struct macvlan_port {
  39	struct net_device	*dev;
  40	struct hlist_head	vlan_hash[MACVLAN_HASH_SIZE];
  41	struct list_head	vlans;
  42	struct rcu_head		rcu;
  43	bool 			passthru;
 
  44	int			count;
 
 
 
 
 
 
 
 
 
 
  45};
  46
 
 
 
 
 
 
  47static void macvlan_port_destroy(struct net_device *dev);
  48
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  49static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
  50{
  51	return rcu_dereference(dev->rx_handler_data);
  52}
  53
  54static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
  55{
  56	return rtnl_dereference(dev->rx_handler_data);
  57}
  58
  59#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
  60
  61static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
  62					       const unsigned char *addr)
  63{
  64	struct macvlan_dev *vlan;
 
  65
  66	hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
 
  67		if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
  68			return vlan;
  69	}
  70	return NULL;
  71}
  72
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  73static void macvlan_hash_add(struct macvlan_dev *vlan)
  74{
  75	struct macvlan_port *port = vlan->port;
  76	const unsigned char *addr = vlan->dev->dev_addr;
 
  77
  78	hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
 
 
 
 
 
 
  79}
  80
  81static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
  82{
  83	hlist_del_rcu(&vlan->hlist);
  84	if (sync)
  85		synchronize_rcu();
  86}
  87
  88static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
  89					const unsigned char *addr)
  90{
  91	macvlan_hash_del(vlan, true);
  92	/* Now that we are unhashed it is safe to change the device
  93	 * address without confusing packet delivery.
  94	 */
  95	memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
  96	macvlan_hash_add(vlan);
  97}
  98
  99static int macvlan_addr_busy(const struct macvlan_port *port,
 100				const unsigned char *addr)
 101{
 102	/* Test to see if the specified multicast address is
 103	 * currently in use by the underlying device or
 104	 * another macvlan.
 105	 */
 106	if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
 107		return 1;
 
 108
 109	if (macvlan_hash_lookup(port, addr))
 110		return 1;
 111
 112	return 0;
 113}
 114
 115
 116static int macvlan_broadcast_one(struct sk_buff *skb,
 117				 const struct macvlan_dev *vlan,
 118				 const struct ethhdr *eth, bool local)
 119{
 120	struct net_device *dev = vlan->dev;
 121
 122	if (local)
 123		return dev_forward_skb(dev, skb);
 124
 125	skb->dev = dev;
 126	if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 127		skb->pkt_type = PACKET_BROADCAST;
 128	else
 129		skb->pkt_type = PACKET_MULTICAST;
 130
 131	return netif_rx(skb);
 132}
 133
 134static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 135{
 136	return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 137}
 138
 139
 140static unsigned int mc_hash(const struct macvlan_dev *vlan,
 141			    const unsigned char *addr)
 142{
 143	u32 val = __get_unaligned_cpu32(addr + 2);
 144
 145	val ^= macvlan_hash_mix(vlan);
 146	return hash_32(val, MACVLAN_MC_FILTER_BITS);
 147}
 148
 149static void macvlan_broadcast(struct sk_buff *skb,
 150			      const struct macvlan_port *port,
 151			      struct net_device *src,
 152			      enum macvlan_mode mode)
 153{
 154	const struct ethhdr *eth = eth_hdr(skb);
 155	const struct macvlan_dev *vlan;
 156	struct sk_buff *nskb;
 157	unsigned int i;
 158	int err;
 159	unsigned int hash;
 160
 161	if (skb->protocol == htons(ETH_P_PAUSE))
 162		return;
 163
 164	for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 165		hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
 166			if (vlan->dev == src || !(vlan->mode & mode))
 167				continue;
 168
 169			hash = mc_hash(vlan, eth->h_dest);
 170			if (!test_bit(hash, vlan->mc_filter))
 171				continue;
 172
 173			err = NET_RX_DROP;
 174			nskb = skb_clone(skb, GFP_ATOMIC);
 175			if (likely(nskb))
 176				err = macvlan_broadcast_one(
 177					nskb, vlan, eth,
 178					mode == MACVLAN_MODE_BRIDGE);
 
 179			macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 180					 err == NET_RX_SUCCESS, 1);
 181		}
 182	}
 183}
 184
 185/* called under rcu_read_lock() from netif_receive_skb */
 186static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 187{
 188	struct macvlan_port *port;
 189	struct sk_buff *skb = *pskb;
 190	const struct ethhdr *eth = eth_hdr(skb);
 191	const struct macvlan_dev *vlan;
 192	const struct macvlan_dev *src;
 193	struct net_device *dev;
 194	unsigned int len = 0;
 195	int ret = NET_RX_DROP;
 
 
 
 
 
 
 
 196
 197	port = macvlan_port_get_rcu(skb->dev);
 198	if (is_multicast_ether_addr(eth->h_dest)) {
 199		skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
 200		if (!skb)
 201			return RX_HANDLER_CONSUMED;
 202		eth = eth_hdr(skb);
 203		src = macvlan_hash_lookup(port, eth->h_source);
 204		if (!src)
 205			/* frame comes from an external address */
 206			macvlan_broadcast(skb, port, NULL,
 207					  MACVLAN_MODE_PRIVATE |
 208					  MACVLAN_MODE_VEPA    |
 209					  MACVLAN_MODE_PASSTHRU|
 210					  MACVLAN_MODE_BRIDGE);
 211		else if (src->mode == MACVLAN_MODE_VEPA)
 212			/* flood to everyone except source */
 213			macvlan_broadcast(skb, port, src->dev,
 214					  MACVLAN_MODE_VEPA |
 215					  MACVLAN_MODE_BRIDGE);
 216		else if (src->mode == MACVLAN_MODE_BRIDGE)
 217			/*
 218			 * flood only to VEPA ports, bridge ports
 219			 * already saw the frame on the way out.
 220			 */
 221			macvlan_broadcast(skb, port, src->dev,
 222					  MACVLAN_MODE_VEPA);
 223		else {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 224			/* forward to original port. */
 225			vlan = src;
 226			ret = macvlan_broadcast_one(skb, vlan, eth, 0);
 
 
 227			goto out;
 228		}
 229
 
 
 
 
 230		return RX_HANDLER_PASS;
 231	}
 232
 233	if (port->passthru)
 
 234		vlan = list_first_or_null_rcu(&port->vlans,
 235					      struct macvlan_dev, list);
 236	else
 237		vlan = macvlan_hash_lookup(port, eth->h_dest);
 238	if (vlan == NULL)
 239		return RX_HANDLER_PASS;
 240
 241	dev = vlan->dev;
 242	if (unlikely(!(dev->flags & IFF_UP))) {
 243		kfree_skb(skb);
 244		return RX_HANDLER_CONSUMED;
 245	}
 246	len = skb->len + ETH_HLEN;
 247	skb = skb_share_check(skb, GFP_ATOMIC);
 248	if (!skb)
 
 
 249		goto out;
 
 250
 
 251	skb->dev = dev;
 252	skb->pkt_type = PACKET_HOST;
 253
 254	ret = netif_rx(skb);
 255
 256out:
 257	macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
 258	return RX_HANDLER_CONSUMED;
 259}
 260
 261static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 262{
 263	const struct macvlan_dev *vlan = netdev_priv(dev);
 264	const struct macvlan_port *port = vlan->port;
 265	const struct macvlan_dev *dest;
 266
 267	if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 268		const struct ethhdr *eth = (void *)skb->data;
 269
 270		/* send to other bridge ports directly */
 271		if (is_multicast_ether_addr(eth->h_dest)) {
 
 272			macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 273			goto xmit_world;
 274		}
 275
 276		dest = macvlan_hash_lookup(port, eth->h_dest);
 277		if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 278			/* send to lowerdev first for its network taps */
 279			dev_forward_skb(vlan->lowerdev, skb);
 280
 281			return NET_XMIT_SUCCESS;
 282		}
 283	}
 284
 285xmit_world:
 286	skb->dev = vlan->lowerdev;
 287	return dev_queue_xmit(skb);
 
 
 
 
 
 
 
 
 
 
 
 288}
 289
 290static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 291				      struct net_device *dev)
 292{
 
 293	unsigned int len = skb->len;
 294	int ret;
 295	const struct macvlan_dev *vlan = netdev_priv(dev);
 296
 297	if (vlan->fwd_priv) {
 298		skb->dev = vlan->lowerdev;
 299		ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
 300	} else {
 301		ret = macvlan_queue_xmit(skb, dev);
 302	}
 303
 304	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 305		struct vlan_pcpu_stats *pcpu_stats;
 306
 307		pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 308		u64_stats_update_begin(&pcpu_stats->syncp);
 309		pcpu_stats->tx_packets++;
 310		pcpu_stats->tx_bytes += len;
 311		u64_stats_update_end(&pcpu_stats->syncp);
 312	} else {
 313		this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 314	}
 315	return ret;
 316}
 317
 318static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 319			       unsigned short type, const void *daddr,
 320			       const void *saddr, unsigned len)
 321{
 322	const struct macvlan_dev *vlan = netdev_priv(dev);
 323	struct net_device *lowerdev = vlan->lowerdev;
 324
 325	return dev_hard_header(skb, lowerdev, type, daddr,
 326			       saddr ? : dev->dev_addr, len);
 327}
 328
 329static const struct header_ops macvlan_hard_header_ops = {
 330	.create  	= macvlan_hard_header,
 331	.rebuild	= eth_rebuild_header,
 332	.parse		= eth_header_parse,
 333	.cache		= eth_header_cache,
 334	.cache_update	= eth_header_cache_update,
 335};
 336
 337static struct rtnl_link_ops macvlan_link_ops;
 338
 339static int macvlan_open(struct net_device *dev)
 340{
 341	struct macvlan_dev *vlan = netdev_priv(dev);
 342	struct net_device *lowerdev = vlan->lowerdev;
 343	int err;
 344
 345	if (vlan->port->passthru) {
 346		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 347			err = dev_set_promiscuity(lowerdev, 1);
 348			if (err < 0)
 349				goto out;
 350		}
 351		goto hash_add;
 352	}
 353
 354	if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
 355	    dev->rtnl_link_ops == &macvlan_link_ops) {
 356		vlan->fwd_priv =
 
 
 
 
 
 
 357		      lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 358
 359		/* If we get a NULL pointer back, or if we get an error
 360		 * then we should just fall through to the non accelerated path
 361		 */
 362		if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
 363			vlan->fwd_priv = NULL;
 364		} else
 365			return 0;
 
 366	}
 367
 368	err = -EBUSY;
 369	if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 370		goto out;
 371
 372	err = dev_uc_add(lowerdev, dev->dev_addr);
 373	if (err < 0)
 374		goto out;
 375	if (dev->flags & IFF_ALLMULTI) {
 376		err = dev_set_allmulti(lowerdev, 1);
 377		if (err < 0)
 378			goto del_unicast;
 379	}
 380
 
 
 
 
 
 
 381hash_add:
 382	macvlan_hash_add(vlan);
 383	return 0;
 384
 
 
 
 385del_unicast:
 386	dev_uc_del(lowerdev, dev->dev_addr);
 387out:
 388	if (vlan->fwd_priv) {
 389		lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 390							   vlan->fwd_priv);
 391		vlan->fwd_priv = NULL;
 
 
 392	}
 
 393	return err;
 394}
 395
 396static int macvlan_stop(struct net_device *dev)
 397{
 398	struct macvlan_dev *vlan = netdev_priv(dev);
 399	struct net_device *lowerdev = vlan->lowerdev;
 400
 401	if (vlan->fwd_priv) {
 402		lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 403							   vlan->fwd_priv);
 404		vlan->fwd_priv = NULL;
 405		return 0;
 406	}
 407
 408	dev_uc_unsync(lowerdev, dev);
 409	dev_mc_unsync(lowerdev, dev);
 410
 411	if (vlan->port->passthru) {
 412		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 413			dev_set_promiscuity(lowerdev, -1);
 414		goto hash_del;
 415	}
 416
 417	if (dev->flags & IFF_ALLMULTI)
 418		dev_set_allmulti(lowerdev, -1);
 419
 
 
 
 420	dev_uc_del(lowerdev, dev->dev_addr);
 421
 422hash_del:
 423	macvlan_hash_del(vlan, !dev->dismantle);
 424	return 0;
 425}
 426
 427static int macvlan_set_mac_address(struct net_device *dev, void *p)
 428{
 429	struct macvlan_dev *vlan = netdev_priv(dev);
 430	struct net_device *lowerdev = vlan->lowerdev;
 431	struct sockaddr *addr = p;
 432	int err;
 433
 434	if (!is_valid_ether_addr(addr->sa_data))
 435		return -EADDRNOTAVAIL;
 436
 437	if (!(dev->flags & IFF_UP)) {
 438		/* Just copy in the new address */
 439		memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 440	} else {
 441		/* Rehash and update the device filters */
 442		if (macvlan_addr_busy(vlan->port, addr->sa_data))
 443			return -EBUSY;
 444
 445		err = dev_uc_add(lowerdev, addr->sa_data);
 446		if (err)
 447			return err;
 
 448
 449		dev_uc_del(lowerdev, dev->dev_addr);
 
 450
 451		macvlan_hash_change_addr(vlan, addr->sa_data);
 
 
 
 
 
 
 
 
 452	}
 
 453	return 0;
 454}
 455
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 456static void macvlan_change_rx_flags(struct net_device *dev, int change)
 457{
 458	struct macvlan_dev *vlan = netdev_priv(dev);
 459	struct net_device *lowerdev = vlan->lowerdev;
 460
 461	if (dev->flags & IFF_UP) {
 462		if (change & IFF_ALLMULTI)
 463			dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 
 
 
 
 464	}
 465}
 466
 467static void macvlan_set_mac_lists(struct net_device *dev)
 
 
 468{
 469	struct macvlan_dev *vlan = netdev_priv(dev);
 470
 471	if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 472		bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
 473	} else {
 474		struct netdev_hw_addr *ha;
 475		DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 476
 477		bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 478		netdev_for_each_mc_addr(ha, dev) {
 479			__set_bit(mc_hash(vlan, ha->addr), filter);
 480		}
 481
 482		__set_bit(mc_hash(vlan, dev->broadcast), filter);
 483
 484		bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 485	}
 
 
 
 
 
 
 
 
 486	dev_uc_sync(vlan->lowerdev, dev);
 487	dev_mc_sync(vlan->lowerdev, dev);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 488}
 489
 490static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 491{
 492	struct macvlan_dev *vlan = netdev_priv(dev);
 493
 494	if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
 495		return -EINVAL;
 496	dev->mtu = new_mtu;
 497	return 0;
 498}
 499
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 500/*
 501 * macvlan network devices have devices nesting below it and are a special
 502 * "super class" of normal network devices; split their locks off into a
 503 * separate class since they always nest.
 504 */
 505static struct lock_class_key macvlan_netdev_xmit_lock_key;
 506static struct lock_class_key macvlan_netdev_addr_lock_key;
 507
 508#define ALWAYS_ON_FEATURES \
 509	(NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
 
 
 
 510
 511#define MACVLAN_FEATURES \
 512	(NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 513	 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
 514	 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 515	 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 516
 517#define MACVLAN_STATE_MASK \
 518	((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 519
 520static int macvlan_get_nest_level(struct net_device *dev)
 521{
 522	return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
 523}
 524
 525static void macvlan_set_lockdep_class_one(struct net_device *dev,
 526					  struct netdev_queue *txq,
 527					  void *_unused)
 528{
 529	lockdep_set_class(&txq->_xmit_lock,
 530			  &macvlan_netdev_xmit_lock_key);
 531}
 532
 533static void macvlan_set_lockdep_class(struct net_device *dev)
 534{
 535	lockdep_set_class_and_subclass(&dev->addr_list_lock,
 536				       &macvlan_netdev_addr_lock_key,
 537				       macvlan_get_nest_level(dev));
 538	netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
 539}
 540
 541static int macvlan_init(struct net_device *dev)
 542{
 543	struct macvlan_dev *vlan = netdev_priv(dev);
 544	const struct net_device *lowerdev = vlan->lowerdev;
 
 545
 546	dev->state		= (dev->state & ~MACVLAN_STATE_MASK) |
 547				  (lowerdev->state & MACVLAN_STATE_MASK);
 548	dev->features 		= lowerdev->features & MACVLAN_FEATURES;
 549	dev->features		|= ALWAYS_ON_FEATURES;
 
 
 
 
 550	dev->gso_max_size	= lowerdev->gso_max_size;
 551	dev->iflink		= lowerdev->ifindex;
 552	dev->hard_header_len	= lowerdev->hard_header_len;
 553
 554	macvlan_set_lockdep_class(dev);
 555
 556	vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 557	if (!vlan->pcpu_stats)
 558		return -ENOMEM;
 559
 
 
 560	return 0;
 561}
 562
 563static void macvlan_uninit(struct net_device *dev)
 564{
 565	struct macvlan_dev *vlan = netdev_priv(dev);
 566	struct macvlan_port *port = vlan->port;
 567
 568	free_percpu(vlan->pcpu_stats);
 569
 
 570	port->count -= 1;
 571	if (!port->count)
 572		macvlan_port_destroy(port->dev);
 573}
 574
 575static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
 576							 struct rtnl_link_stats64 *stats)
 577{
 578	struct macvlan_dev *vlan = netdev_priv(dev);
 579
 580	if (vlan->pcpu_stats) {
 581		struct vlan_pcpu_stats *p;
 582		u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 583		u32 rx_errors = 0, tx_dropped = 0;
 584		unsigned int start;
 585		int i;
 586
 587		for_each_possible_cpu(i) {
 588			p = per_cpu_ptr(vlan->pcpu_stats, i);
 589			do {
 590				start = u64_stats_fetch_begin_irq(&p->syncp);
 591				rx_packets	= p->rx_packets;
 592				rx_bytes	= p->rx_bytes;
 593				rx_multicast	= p->rx_multicast;
 594				tx_packets	= p->tx_packets;
 595				tx_bytes	= p->tx_bytes;
 596			} while (u64_stats_fetch_retry_irq(&p->syncp, start));
 597
 598			stats->rx_packets	+= rx_packets;
 599			stats->rx_bytes		+= rx_bytes;
 600			stats->multicast	+= rx_multicast;
 601			stats->tx_packets	+= tx_packets;
 602			stats->tx_bytes		+= tx_bytes;
 603			/* rx_errors & tx_dropped are u32, updated
 604			 * without syncp protection.
 605			 */
 606			rx_errors	+= p->rx_errors;
 607			tx_dropped	+= p->tx_dropped;
 608		}
 609		stats->rx_errors	= rx_errors;
 610		stats->rx_dropped	= rx_errors;
 611		stats->tx_dropped	= tx_dropped;
 612	}
 613	return stats;
 614}
 615
 616static int macvlan_vlan_rx_add_vid(struct net_device *dev,
 617				   __be16 proto, u16 vid)
 618{
 619	struct macvlan_dev *vlan = netdev_priv(dev);
 620	struct net_device *lowerdev = vlan->lowerdev;
 621
 622	return vlan_vid_add(lowerdev, proto, vid);
 623}
 624
 625static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
 626				    __be16 proto, u16 vid)
 627{
 628	struct macvlan_dev *vlan = netdev_priv(dev);
 629	struct net_device *lowerdev = vlan->lowerdev;
 630
 631	vlan_vid_del(lowerdev, proto, vid);
 632	return 0;
 633}
 634
 635static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 636			   struct net_device *dev,
 637			   const unsigned char *addr,
 638			   u16 flags)
 
 639{
 640	struct macvlan_dev *vlan = netdev_priv(dev);
 641	int err = -EINVAL;
 642
 643	if (!vlan->port->passthru)
 
 
 
 644		return -EOPNOTSUPP;
 645
 646	if (flags & NLM_F_REPLACE)
 647		return -EOPNOTSUPP;
 648
 649	if (is_unicast_ether_addr(addr))
 650		err = dev_uc_add_excl(dev, addr);
 651	else if (is_multicast_ether_addr(addr))
 652		err = dev_mc_add_excl(dev, addr);
 653
 654	return err;
 655}
 656
 657static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 658			   struct net_device *dev,
 659			   const unsigned char *addr)
 660{
 661	struct macvlan_dev *vlan = netdev_priv(dev);
 662	int err = -EINVAL;
 663
 664	if (!vlan->port->passthru)
 
 
 
 665		return -EOPNOTSUPP;
 666
 667	if (is_unicast_ether_addr(addr))
 668		err = dev_uc_del(dev, addr);
 669	else if (is_multicast_ether_addr(addr))
 670		err = dev_mc_del(dev, addr);
 671
 672	return err;
 673}
 674
 675static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
 676					struct ethtool_drvinfo *drvinfo)
 677{
 678	strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
 679	strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
 680}
 681
 682static int macvlan_ethtool_get_settings(struct net_device *dev,
 683					struct ethtool_cmd *cmd)
 684{
 685	const struct macvlan_dev *vlan = netdev_priv(dev);
 686
 687	return __ethtool_get_settings(vlan->lowerdev, cmd);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 688}
 689
 690static netdev_features_t macvlan_fix_features(struct net_device *dev,
 691					      netdev_features_t features)
 692{
 693	struct macvlan_dev *vlan = netdev_priv(dev);
 
 694	netdev_features_t mask;
 695
 696	features |= NETIF_F_ALL_FOR_ALL;
 697	features &= (vlan->set_features | ~MACVLAN_FEATURES);
 698	mask = features;
 699
 700	features = netdev_increment_features(vlan->lowerdev->features,
 701					     features,
 702					     mask);
 703	features |= ALWAYS_ON_FEATURES;
 
 704
 705	return features;
 706}
 707
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 708static const struct ethtool_ops macvlan_ethtool_ops = {
 709	.get_link		= ethtool_op_get_link,
 710	.get_settings		= macvlan_ethtool_get_settings,
 711	.get_drvinfo		= macvlan_ethtool_get_drvinfo,
 
 712};
 713
 714static const struct net_device_ops macvlan_netdev_ops = {
 715	.ndo_init		= macvlan_init,
 716	.ndo_uninit		= macvlan_uninit,
 717	.ndo_open		= macvlan_open,
 718	.ndo_stop		= macvlan_stop,
 719	.ndo_start_xmit		= macvlan_start_xmit,
 720	.ndo_change_mtu		= macvlan_change_mtu,
 
 721	.ndo_fix_features	= macvlan_fix_features,
 722	.ndo_change_rx_flags	= macvlan_change_rx_flags,
 723	.ndo_set_mac_address	= macvlan_set_mac_address,
 724	.ndo_set_rx_mode	= macvlan_set_mac_lists,
 725	.ndo_get_stats64	= macvlan_dev_get_stats64,
 726	.ndo_validate_addr	= eth_validate_addr,
 727	.ndo_vlan_rx_add_vid	= macvlan_vlan_rx_add_vid,
 728	.ndo_vlan_rx_kill_vid	= macvlan_vlan_rx_kill_vid,
 729	.ndo_fdb_add		= macvlan_fdb_add,
 730	.ndo_fdb_del		= macvlan_fdb_del,
 731	.ndo_fdb_dump		= ndo_dflt_fdb_dump,
 732	.ndo_get_lock_subclass  = macvlan_get_nest_level,
 
 
 
 
 
 
 
 733};
 734
 735void macvlan_common_setup(struct net_device *dev)
 736{
 737	ether_setup(dev);
 738
 739	dev->priv_flags	       &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 
 
 
 740	dev->priv_flags	       |= IFF_UNICAST_FLT;
 741	dev->netdev_ops		= &macvlan_netdev_ops;
 742	dev->destructor		= free_netdev;
 743	dev->header_ops		= &macvlan_hard_header_ops;
 744	dev->ethtool_ops	= &macvlan_ethtool_ops;
 745}
 746EXPORT_SYMBOL_GPL(macvlan_common_setup);
 747
 748static void macvlan_setup(struct net_device *dev)
 749{
 750	macvlan_common_setup(dev);
 751	dev->tx_queue_len	= 0;
 752}
 753
 754static int macvlan_port_create(struct net_device *dev)
 755{
 756	struct macvlan_port *port;
 757	unsigned int i;
 758	int err;
 759
 760	if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
 761		return -EINVAL;
 762
 
 
 
 763	port = kzalloc(sizeof(*port), GFP_KERNEL);
 764	if (port == NULL)
 765		return -ENOMEM;
 766
 767	port->passthru = false;
 768	port->dev = dev;
 
 769	INIT_LIST_HEAD(&port->vlans);
 770	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
 771		INIT_HLIST_HEAD(&port->vlan_hash[i]);
 
 
 
 
 
 772
 773	err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
 774	if (err)
 775		kfree(port);
 776	else
 777		dev->priv_flags |= IFF_MACVLAN_PORT;
 778	return err;
 779}
 780
 781static void macvlan_port_destroy(struct net_device *dev)
 782{
 783	struct macvlan_port *port = macvlan_port_get_rtnl(dev);
 
 784
 785	dev->priv_flags &= ~IFF_MACVLAN_PORT;
 786	netdev_rx_handler_unregister(dev);
 787	kfree_rcu(port, rcu);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 788}
 789
 790static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
 
 791{
 
 
 
 792	if (tb[IFLA_ADDRESS]) {
 793		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 794			return -EINVAL;
 795		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 796			return -EADDRNOTAVAIL;
 797	}
 798
 799	if (data && data[IFLA_MACVLAN_FLAGS] &&
 
 
 
 800	    nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
 801		return -EINVAL;
 802
 803	if (data && data[IFLA_MACVLAN_MODE]) {
 804		switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
 805		case MACVLAN_MODE_PRIVATE:
 806		case MACVLAN_MODE_VEPA:
 807		case MACVLAN_MODE_BRIDGE:
 808		case MACVLAN_MODE_PASSTHRU:
 
 
 
 
 
 
 
 
 
 
 
 
 
 809			break;
 810		default:
 811			return -EINVAL;
 812		}
 813	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 814	return 0;
 815}
 816
 817int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 818			   struct nlattr *tb[], struct nlattr *data[])
 
 819{
 820	struct macvlan_dev *vlan = netdev_priv(dev);
 821	struct macvlan_port *port;
 822	struct net_device *lowerdev;
 823	int err;
 
 
 824
 825	if (!tb[IFLA_LINK])
 826		return -EINVAL;
 827
 828	lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 829	if (lowerdev == NULL)
 830		return -ENODEV;
 831
 832	/* When creating macvlans or macvtaps on top of other macvlans - use
 833	 * the real device as the lowerdev.
 834	 */
 835	if (netif_is_macvlan(lowerdev))
 836		lowerdev = macvlan_dev_real_dev(lowerdev);
 837
 838	if (!tb[IFLA_MTU])
 839		dev->mtu = lowerdev->mtu;
 840	else if (dev->mtu > lowerdev->mtu)
 841		return -EINVAL;
 842
 
 
 
 
 843	if (!tb[IFLA_ADDRESS])
 844		eth_hw_addr_random(dev);
 845
 846	if (!macvlan_port_exists(lowerdev)) {
 847		err = macvlan_port_create(lowerdev);
 848		if (err < 0)
 849			return err;
 
 850	}
 851	port = macvlan_port_get_rtnl(lowerdev);
 852
 853	/* Only 1 macvlan device can be created in passthru mode */
 854	if (port->passthru)
 855		return -EINVAL;
 
 
 
 
 
 856
 857	vlan->lowerdev = lowerdev;
 858	vlan->dev      = dev;
 859	vlan->port     = port;
 860	vlan->set_features = MACVLAN_FEATURES;
 861	vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
 862
 863	vlan->mode     = MACVLAN_MODE_VEPA;
 864	if (data && data[IFLA_MACVLAN_MODE])
 865		vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 866
 867	if (data && data[IFLA_MACVLAN_FLAGS])
 868		vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 869
 870	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 871		if (port->count)
 872			return -EINVAL;
 873		port->passthru = true;
 
 
 874		eth_hw_addr_inherit(dev, lowerdev);
 875	}
 876
 877	port->count += 1;
 
 
 
 
 
 
 
 
 
 
 878	err = register_netdevice(dev);
 879	if (err < 0)
 880		goto destroy_port;
 881
 882	dev->priv_flags |= IFF_MACVLAN;
 883	err = netdev_upper_dev_link(lowerdev, dev);
 884	if (err)
 885		goto unregister_netdev;
 886
 887	list_add_tail_rcu(&vlan->list, &port->vlans);
 888	netif_stacked_transfer_operstate(lowerdev, dev);
 
 889
 890	return 0;
 891
 892unregister_netdev:
 
 893	unregister_netdevice(dev);
 894destroy_port:
 895	port->count -= 1;
 896	if (!port->count)
 897		macvlan_port_destroy(lowerdev);
 898
 
 
 899	return err;
 900}
 901EXPORT_SYMBOL_GPL(macvlan_common_newlink);
 902
 903static int macvlan_newlink(struct net *src_net, struct net_device *dev,
 904			   struct nlattr *tb[], struct nlattr *data[])
 
 905{
 906	return macvlan_common_newlink(src_net, dev, tb, data);
 907}
 908
 909void macvlan_dellink(struct net_device *dev, struct list_head *head)
 910{
 911	struct macvlan_dev *vlan = netdev_priv(dev);
 912
 
 
 913	list_del_rcu(&vlan->list);
 914	unregister_netdevice_queue(dev, head);
 915	netdev_upper_dev_unlink(vlan->lowerdev, dev);
 916}
 917EXPORT_SYMBOL_GPL(macvlan_dellink);
 918
 919static int macvlan_changelink(struct net_device *dev,
 920		struct nlattr *tb[], struct nlattr *data[])
 
 921{
 922	struct macvlan_dev *vlan = netdev_priv(dev);
 923	enum macvlan_mode mode;
 924	bool set_mode = false;
 
 
 925
 926	/* Validate mode, but don't set yet: setting flags may fail. */
 927	if (data && data[IFLA_MACVLAN_MODE]) {
 928		set_mode = true;
 929		mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
 930		/* Passthrough mode can't be set or cleared dynamically */
 931		if ((mode == MACVLAN_MODE_PASSTHRU) !=
 932		    (vlan->mode == MACVLAN_MODE_PASSTHRU))
 933			return -EINVAL;
 
 
 
 934	}
 935
 936	if (data && data[IFLA_MACVLAN_FLAGS]) {
 937		__u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 938		bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
 939		if (vlan->port->passthru && promisc) {
 940			int err;
 941
 942			if (flags & MACVLAN_FLAG_NOPROMISC)
 943				err = dev_set_promiscuity(vlan->lowerdev, -1);
 944			else
 945				err = dev_set_promiscuity(vlan->lowerdev, 1);
 946			if (err < 0)
 947				return err;
 948		}
 949		vlan->flags = flags;
 950	}
 951	if (set_mode)
 952		vlan->mode = mode;
 
 
 
 
 
 
 
 
 953	return 0;
 954}
 955
 
 
 
 
 
 
 
 
 956static size_t macvlan_get_size(const struct net_device *dev)
 957{
 
 
 958	return (0
 959		+ nla_total_size(4) /* IFLA_MACVLAN_MODE */
 960		+ nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
 
 
 961		);
 962}
 963
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 964static int macvlan_fill_info(struct sk_buff *skb,
 965				const struct net_device *dev)
 966{
 967	struct macvlan_dev *vlan = netdev_priv(dev);
 
 
 968
 969	if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
 970		goto nla_put_failure;
 971	if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
 972		goto nla_put_failure;
 
 
 
 
 
 
 
 
 
 
 
 
 
 973	return 0;
 974
 975nla_put_failure:
 976	return -EMSGSIZE;
 977}
 978
 979static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
 980	[IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
 981	[IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
 
 
 
 
 982};
 983
 984int macvlan_link_register(struct rtnl_link_ops *ops)
 985{
 986	/* common fields */
 987	ops->priv_size		= sizeof(struct macvlan_dev);
 988	ops->validate		= macvlan_validate;
 989	ops->maxtype		= IFLA_MACVLAN_MAX;
 990	ops->policy		= macvlan_policy;
 991	ops->changelink		= macvlan_changelink;
 992	ops->get_size		= macvlan_get_size;
 993	ops->fill_info		= macvlan_fill_info;
 994
 995	return rtnl_link_register(ops);
 996};
 997EXPORT_SYMBOL_GPL(macvlan_link_register);
 998
 
 
 
 
 
 999static struct rtnl_link_ops macvlan_link_ops = {
1000	.kind		= "macvlan",
1001	.setup		= macvlan_setup,
1002	.newlink	= macvlan_newlink,
1003	.dellink	= macvlan_dellink,
 
 
1004};
1005
1006static int macvlan_device_event(struct notifier_block *unused,
1007				unsigned long event, void *ptr)
1008{
1009	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1010	struct macvlan_dev *vlan, *next;
1011	struct macvlan_port *port;
1012	LIST_HEAD(list_kill);
1013
1014	if (!macvlan_port_exists(dev))
1015		return NOTIFY_DONE;
1016
1017	port = macvlan_port_get_rtnl(dev);
1018
1019	switch (event) {
 
 
1020	case NETDEV_CHANGE:
1021		list_for_each_entry(vlan, &port->vlans, list)
1022			netif_stacked_transfer_operstate(vlan->lowerdev,
1023							 vlan->dev);
1024		break;
1025	case NETDEV_FEAT_CHANGE:
1026		list_for_each_entry(vlan, &port->vlans, list) {
1027			vlan->dev->gso_max_size = dev->gso_max_size;
 
1028			netdev_update_features(vlan->dev);
1029		}
1030		break;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1031	case NETDEV_UNREGISTER:
1032		/* twiddle thumbs on netns device moves */
1033		if (dev->reg_state != NETREG_UNREGISTERING)
1034			break;
1035
1036		list_for_each_entry_safe(vlan, next, &port->vlans, list)
1037			vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1038		unregister_netdevice_many(&list_kill);
1039		list_del(&list_kill);
1040		break;
1041	case NETDEV_PRE_TYPE_CHANGE:
1042		/* Forbid underlaying device to change its type. */
1043		return NOTIFY_BAD;
 
 
 
 
 
 
 
1044	}
1045	return NOTIFY_DONE;
1046}
1047
1048static struct notifier_block macvlan_notifier_block __read_mostly = {
1049	.notifier_call	= macvlan_device_event,
1050};
1051
1052static int __init macvlan_init_module(void)
1053{
1054	int err;
1055
1056	register_netdevice_notifier(&macvlan_notifier_block);
1057
1058	err = macvlan_link_register(&macvlan_link_ops);
1059	if (err < 0)
1060		goto err1;
1061	return 0;
1062err1:
1063	unregister_netdevice_notifier(&macvlan_notifier_block);
1064	return err;
1065}
1066
1067static void __exit macvlan_cleanup_module(void)
1068{
1069	rtnl_link_unregister(&macvlan_link_ops);
1070	unregister_netdevice_notifier(&macvlan_notifier_block);
1071}
1072
1073module_init(macvlan_init_module);
1074module_exit(macvlan_cleanup_module);
1075
1076MODULE_LICENSE("GPL");
1077MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1078MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1079MODULE_ALIAS_RTNL_LINK("macvlan");