Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1845 insertions, 0 deletions

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
new file mode 100644
index 000000000..012830d12
--- /dev/null
+++ b/drivers/net/macvlan.c
@@ -0,0 +1,1845 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
+ *
+ * The code this is based on carried the following copyright notice:
+ * ---
+ * (C) Copyright 2001-2006
+ * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
+ * Re-worked by Ben Greear <greearb@candelatech.com>
+ * ---
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/rculist.h>
+#include <linux/notifier.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/net_tstamp.h>
+#include <linux/ethtool.h>
+#include <linux/if_arp.h>
+#include <linux/if_vlan.h>
+#include <linux/if_link.h>
+#include <linux/if_macvlan.h>
+#include <linux/hash.h>
+#include <linux/workqueue.h>
+#include <net/rtnetlink.h>
+#include <net/xfrm.h>
+#include <linux/netpoll.h>
+#include <linux/phy.h>
+
+#define MACVLAN_HASH_BITS	8
+#define MACVLAN_HASH_SIZE	(1<<MACVLAN_HASH_BITS)
+#define MACVLAN_DEFAULT_BC_QUEUE_LEN	1000
+
+#define MACVLAN_F_PASSTHRU	1
+#define MACVLAN_F_ADDRCHANGE	2
+
+struct macvlan_port {
+	struct net_device	*dev;
+	struct hlist_head	vlan_hash[MACVLAN_HASH_SIZE];
+	struct list_head	vlans;
+	struct sk_buff_head	bc_queue;
+	struct work_struct	bc_work;
+	u32			bc_queue_len_used;
+	u32			flags;
+	int			count;
+	struct hlist_head	vlan_source_hash[MACVLAN_HASH_SIZE];
+	DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
+	unsigned char           perm_addr[ETH_ALEN];
+};
+
+struct macvlan_source_entry {
+	struct hlist_node	hlist;
+	struct macvlan_dev	*vlan;
+	unsigned char		addr[6+2] __aligned(sizeof(u16));
+	struct rcu_head		rcu;
+};
+
+struct macvlan_skb_cb {
+	const struct macvlan_dev *src;
+};
+
+#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
+
+static void macvlan_port_destroy(struct net_device *dev);
+static void update_port_bc_queue_len(struct macvlan_port *port);
+
+static inline bool macvlan_passthru(const struct macvlan_port *port)
+{
+	return port->flags & MACVLAN_F_PASSTHRU;
+}
+
+static inline void macvlan_set_passthru(struct macvlan_port *port)
+{
+	port->flags |= MACVLAN_F_PASSTHRU;
+}
+
+static inline bool macvlan_addr_change(const struct macvlan_port *port)
+{
+	return port->flags & MACVLAN_F_ADDRCHANGE;
+}
+
+static inline void macvlan_set_addr_change(struct macvlan_port *port)
+{
+	port->flags |= MACVLAN_F_ADDRCHANGE;
+}
+
+static inline void macvlan_clear_addr_change(struct macvlan_port *port)
+{
+	port->flags &= ~MACVLAN_F_ADDRCHANGE;
+}
+
+/* Hash Ethernet address */
+static u32 macvlan_eth_hash(const unsigned char *addr)
+{
+	u64 value = get_unaligned((u64 *)addr);
+
+	/* only want 6 bytes */
+#ifdef __BIG_ENDIAN
+	value >>= 16;
+#else
+	value <<= 16;
+#endif
+	return hash_64(value, MACVLAN_HASH_BITS);
+}
+
+static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
+{
+	return rcu_dereference(dev->rx_handler_data);
+}
+
+static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
+{
+	return rtnl_dereference(dev->rx_handler_data);
+}
+
+static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
+					       const unsigned char *addr)
+{
+	struct macvlan_dev *vlan;
+	u32 idx = macvlan_eth_hash(addr);
+
+	hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist,
+				 lockdep_rtnl_is_held()) {
+		if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
+			return vlan;
+	}
+	return NULL;
+}
+
+static struct macvlan_source_entry *macvlan_hash_lookup_source(
+	const struct macvlan_dev *vlan,
+	const unsigned char *addr)
+{
+	struct macvlan_source_entry *entry;
+	u32 idx = macvlan_eth_hash(addr);
+	struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
+
+	hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
+		if (ether_addr_equal_64bits(entry->addr, addr) &&
+		    entry->vlan == vlan)
+			return entry;
+	}
+	return NULL;
+}
+
+static int macvlan_hash_add_source(struct macvlan_dev *vlan,
+				   const unsigned char *addr)
+{
+	struct macvlan_port *port = vlan->port;
+	struct macvlan_source_entry *entry;
+	struct hlist_head *h;
+
+	entry = macvlan_hash_lookup_source(vlan, addr);
+	if (entry)
+		return 0;
+
+	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry)
+		return -ENOMEM;
+
+	ether_addr_copy(entry->addr, addr);
+	entry->vlan = vlan;
+	h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
+	hlist_add_head_rcu(&entry->hlist, h);
+	vlan->macaddr_count++;
+
+	return 0;
+}
+
+static void macvlan_hash_add(struct macvlan_dev *vlan)
+{
+	struct macvlan_port *port = vlan->port;
+	const unsigned char *addr = vlan->dev->dev_addr;
+	u32 idx = macvlan_eth_hash(addr);
+
+	hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
+}
+
+static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
+{
+	hlist_del_rcu(&entry->hlist);
+	kfree_rcu(entry, rcu);
+}
+
+static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
+{
+	hlist_del_rcu(&vlan->hlist);
+	if (sync)
+		synchronize_rcu();
+}
+
+static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
+					const unsigned char *addr)
+{
+	macvlan_hash_del(vlan, true);
+	/* Now that we are unhashed it is safe to change the device
+	 * address without confusing packet delivery.
+	 */
+	eth_hw_addr_set(vlan->dev, addr);
+	macvlan_hash_add(vlan);
+}
+
+static bool macvlan_addr_busy(const struct macvlan_port *port,
+			      const unsigned char *addr)
+{
+	/* Test to see if the specified address is
+	 * currently in use by the underlying device or
+	 * another macvlan.
+	 */
+	if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
+	    ether_addr_equal_64bits(port->dev->dev_addr, addr))
+		return true;
+
+	if (macvlan_hash_lookup(port, addr))
+		return true;
+
+	return false;
+}
+
+
+static int macvlan_broadcast_one(struct sk_buff *skb,
+				 const struct macvlan_dev *vlan,
+				 const struct ethhdr *eth, bool local)
+{
+	struct net_device *dev = vlan->dev;
+
+	if (local)
+		return __dev_forward_skb(dev, skb);
+
+	skb->dev = dev;
+	if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
+		skb->pkt_type = PACKET_BROADCAST;
+	else
+		skb->pkt_type = PACKET_MULTICAST;
+
+	return 0;
+}
+
+static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
+{
+	return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
+}
+
+
+static unsigned int mc_hash(const struct macvlan_dev *vlan,
+			    const unsigned char *addr)
+{
+	u32 val = __get_unaligned_cpu32(addr + 2);
+
+	val ^= macvlan_hash_mix(vlan);
+	return hash_32(val, MACVLAN_MC_FILTER_BITS);
+}
+
+static void macvlan_broadcast(struct sk_buff *skb,
+			      const struct macvlan_port *port,
+			      struct net_device *src,
+			      enum macvlan_mode mode)
+{
+	const struct ethhdr *eth = eth_hdr(skb);
+	const struct macvlan_dev *vlan;
+	struct sk_buff *nskb;
+	unsigned int i;
+	int err;
+	unsigned int hash;
+
+	if (skb->protocol == htons(ETH_P_PAUSE))
+		return;
+
+	hash_for_each_rcu(port->vlan_hash, i, vlan, hlist) {
+		if (vlan->dev == src || !(vlan->mode & mode))
+			continue;
+
+		hash = mc_hash(vlan, eth->h_dest);
+		if (!test_bit(hash, vlan->mc_filter))
+			continue;
+
+		err = NET_RX_DROP;
+		nskb = skb_clone(skb, GFP_ATOMIC);
+		if (likely(nskb))
+			err = macvlan_broadcast_one(nskb, vlan, eth,
+					mode == MACVLAN_MODE_BRIDGE) ?:
+			      netif_rx(nskb);
+		macvlan_count_rx(vlan, skb->len + ETH_HLEN,
+				 err == NET_RX_SUCCESS, true);
+	}
+}
+
+static void macvlan_process_broadcast(struct work_struct *w)
+{
+	struct macvlan_port *port = container_of(w, struct macvlan_port,
+						 bc_work);
+	struct sk_buff *skb;
+	struct sk_buff_head list;
+
+	__skb_queue_head_init(&list);
+
+	spin_lock_bh(&port->bc_queue.lock);
+	skb_queue_splice_tail_init(&port->bc_queue, &list);
+	spin_unlock_bh(&port->bc_queue.lock);
+
+	while ((skb = __skb_dequeue(&list))) {
+		const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
+
+		rcu_read_lock();
+
+		if (!src)
+			/* frame comes from an external address */
+			macvlan_broadcast(skb, port, NULL,
+					  MACVLAN_MODE_PRIVATE |
+					  MACVLAN_MODE_VEPA    |
+					  MACVLAN_MODE_PASSTHRU|
+					  MACVLAN_MODE_BRIDGE);
+		else if (src->mode == MACVLAN_MODE_VEPA)
+			/* flood to everyone except source */
+			macvlan_broadcast(skb, port, src->dev,
+					  MACVLAN_MODE_VEPA |
+					  MACVLAN_MODE_BRIDGE);
+		else
+			/*
+			 * flood only to VEPA ports, bridge ports
+			 * already saw the frame on the way out.
+			 */
+			macvlan_broadcast(skb, port, src->dev,
+					  MACVLAN_MODE_VEPA);
+
+		rcu_read_unlock();
+
+		if (src)
+			dev_put(src->dev);
+		consume_skb(skb);
+
+		cond_resched();
+	}
+}
+
+static void macvlan_broadcast_enqueue(struct macvlan_port *port,
+				      const struct macvlan_dev *src,
+				      struct sk_buff *skb)
+{
+	struct sk_buff *nskb;
+	int err = -ENOMEM;
+
+	nskb = skb_clone(skb, GFP_ATOMIC);
+	if (!nskb)
+		goto err;
+
+	MACVLAN_SKB_CB(nskb)->src = src;
+
+	spin_lock(&port->bc_queue.lock);
+	if (skb_queue_len(&port->bc_queue) < port->bc_queue_len_used) {
+		if (src)
+			dev_hold(src->dev);
+		__skb_queue_tail(&port->bc_queue, nskb);
+		err = 0;
+	}
+	spin_unlock(&port->bc_queue.lock);
+
+	queue_work(system_unbound_wq, &port->bc_work);
+
+	if (err)
+		goto free_nskb;
+
+	return;
+
+free_nskb:
+	kfree_skb(nskb);
+err:
+	dev_core_stats_rx_dropped_inc(skb->dev);
+}
+
+static void macvlan_flush_sources(struct macvlan_port *port,
+				  struct macvlan_dev *vlan)
+{
+	struct macvlan_source_entry *entry;
+	struct hlist_node *next;
+	int i;
+
+	hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist)
+		if (entry->vlan == vlan)
+			macvlan_hash_del_source(entry);
+
+	vlan->macaddr_count = 0;
+}
+
+static void macvlan_forward_source_one(struct sk_buff *skb,
+				       struct macvlan_dev *vlan)
+{
+	struct sk_buff *nskb;
+	struct net_device *dev;
+	int len;
+	int ret;
+
+	dev = vlan->dev;
+	if (unlikely(!(dev->flags & IFF_UP)))
+		return;
+
+	nskb = skb_clone(skb, GFP_ATOMIC);
+	if (!nskb)
+		return;
+
+	len = nskb->len + ETH_HLEN;
+	nskb->dev = dev;
+
+	if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
+		nskb->pkt_type = PACKET_HOST;
+
+	ret = __netif_rx(nskb);
+	macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
+}
+
+static bool macvlan_forward_source(struct sk_buff *skb,
+				   struct macvlan_port *port,
+				   const unsigned char *addr)
+{
+	struct macvlan_source_entry *entry;
+	u32 idx = macvlan_eth_hash(addr);
+	struct hlist_head *h = &port->vlan_source_hash[idx];
+	bool consume = false;
+
+	hlist_for_each_entry_rcu(entry, h, hlist) {
+		if (ether_addr_equal_64bits(entry->addr, addr)) {
+			if (entry->vlan->flags & MACVLAN_FLAG_NODST)
+				consume = true;
+			macvlan_forward_source_one(skb, entry->vlan);
+		}
+	}
+
+	return consume;
+}
+
+/* called under rcu_read_lock() from netif_receive_skb */
+static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
+{
+	struct macvlan_port *port;
+	struct sk_buff *skb = *pskb;
+	const struct ethhdr *eth = eth_hdr(skb);
+	const struct macvlan_dev *vlan;
+	const struct macvlan_dev *src;
+	struct net_device *dev;
+	unsigned int len = 0;
+	int ret;
+	rx_handler_result_t handle_res;
+
+	/* Packets from dev_loopback_xmit() do not have L2 header, bail out */
+	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
+		return RX_HANDLER_PASS;
+
+	port = macvlan_port_get_rcu(skb->dev);
+	if (is_multicast_ether_addr(eth->h_dest)) {
+		unsigned int hash;
+
+		skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
+		if (!skb)
+			return RX_HANDLER_CONSUMED;
+		*pskb = skb;
+		eth = eth_hdr(skb);
+		if (macvlan_forward_source(skb, port, eth->h_source)) {
+			kfree_skb(skb);
+			return RX_HANDLER_CONSUMED;
+		}
+		src = macvlan_hash_lookup(port, eth->h_source);
+		if (src && src->mode != MACVLAN_MODE_VEPA &&
+		    src->mode != MACVLAN_MODE_BRIDGE) {
+			/* forward to original port. */
+			vlan = src;
+			ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
+			      __netif_rx(skb);
+			handle_res = RX_HANDLER_CONSUMED;
+			goto out;
+		}
+
+		hash = mc_hash(NULL, eth->h_dest);
+		if (test_bit(hash, port->mc_filter))
+			macvlan_broadcast_enqueue(port, src, skb);
+
+		return RX_HANDLER_PASS;
+	}
+
+	if (macvlan_forward_source(skb, port, eth->h_source)) {
+		kfree_skb(skb);
+		return RX_HANDLER_CONSUMED;
+	}
+	if (macvlan_passthru(port))
+		vlan = list_first_or_null_rcu(&port->vlans,
+					      struct macvlan_dev, list);
+	else
+		vlan = macvlan_hash_lookup(port, eth->h_dest);
+	if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
+		return RX_HANDLER_PASS;
+
+	dev = vlan->dev;
+	if (unlikely(!(dev->flags & IFF_UP))) {
+		kfree_skb(skb);
+		return RX_HANDLER_CONSUMED;
+	}
+	len = skb->len + ETH_HLEN;
+	skb = skb_share_check(skb, GFP_ATOMIC);
+	if (!skb) {
+		ret = NET_RX_DROP;
+		handle_res = RX_HANDLER_CONSUMED;
+		goto out;
+	}
+
+	*pskb = skb;
+	skb->dev = dev;
+	skb->pkt_type = PACKET_HOST;
+
+	ret = NET_RX_SUCCESS;
+	handle_res = RX_HANDLER_ANOTHER;
+out:
+	macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
+	return handle_res;
+}
+
+static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	const struct macvlan_dev *vlan = netdev_priv(dev);
+	const struct macvlan_port *port = vlan->port;
+	const struct macvlan_dev *dest;
+
+	if (vlan->mode == MACVLAN_MODE_BRIDGE) {
+		const struct ethhdr *eth = skb_eth_hdr(skb);
+
+		/* send to other bridge ports directly */
+		if (is_multicast_ether_addr(eth->h_dest)) {
+			skb_reset_mac_header(skb);
+			macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
+			goto xmit_world;
+		}
+
+		dest = macvlan_hash_lookup(port, eth->h_dest);
+		if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
+			/* send to lowerdev first for its network taps */
+			dev_forward_skb(vlan->lowerdev, skb);
+
+			return NET_XMIT_SUCCESS;
+		}
+	}
+xmit_world:
+	skb->dev = vlan->lowerdev;
+	return dev_queue_xmit_accel(skb,
+				    netdev_get_sb_channel(dev) ? dev : NULL);
+}
+
+static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	return netpoll_send_skb(vlan->netpoll, skb);
+#else
+	BUG();
+	return NETDEV_TX_OK;
+#endif
+}
+
+static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
+				      struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	unsigned int len = skb->len;
+	int ret;
+
+	if (unlikely(netpoll_tx_running(dev)))
+		return macvlan_netpoll_send_skb(vlan, skb);
+
+	ret = macvlan_queue_xmit(skb, dev);
+
+	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
+		struct vlan_pcpu_stats *pcpu_stats;
+
+		pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
+		u64_stats_update_begin(&pcpu_stats->syncp);
+		u64_stats_inc(&pcpu_stats->tx_packets);
+		u64_stats_add(&pcpu_stats->tx_bytes, len);
+		u64_stats_update_end(&pcpu_stats->syncp);
+	} else {
+		this_cpu_inc(vlan->pcpu_stats->tx_dropped);
+	}
+	return ret;
+}
+
+static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
+			       unsigned short type, const void *daddr,
+			       const void *saddr, unsigned len)
+{
+	const struct macvlan_dev *vlan = netdev_priv(dev);
+	struct net_device *lowerdev = vlan->lowerdev;
+
+	return dev_hard_header(skb, lowerdev, type, daddr,
+			       saddr ? : dev->dev_addr, len);
+}
+
+static const struct header_ops macvlan_hard_header_ops = {
+	.create  	= macvlan_hard_header,
+	.parse		= eth_header_parse,
+	.cache		= eth_header_cache,
+	.cache_update	= eth_header_cache_update,
+};
+
+static int macvlan_open(struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct net_device *lowerdev = vlan->lowerdev;
+	int err;
+
+	if (macvlan_passthru(vlan->port)) {
+		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
+			err = dev_set_promiscuity(lowerdev, 1);
+			if (err < 0)
+				goto out;
+		}
+		goto hash_add;
+	}
+
+	err = -EADDRINUSE;
+	if (macvlan_addr_busy(vlan->port, dev->dev_addr))
+		goto out;
+
+	/* Attempt to populate accel_priv which is used to offload the L2
+	 * forwarding requests for unicast packets.
+	 */
+	if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
+		vlan->accel_priv =
+		      lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
+
+	/* If earlier attempt to offload failed, or accel_priv is not
+	 * populated we must add the unicast address to the lower device.
+	 */
+	if (IS_ERR_OR_NULL(vlan->accel_priv)) {
+		vlan->accel_priv = NULL;
+		err = dev_uc_add(lowerdev, dev->dev_addr);
+		if (err < 0)
+			goto out;
+	}
+
+	if (dev->flags & IFF_ALLMULTI) {
+		err = dev_set_allmulti(lowerdev, 1);
+		if (err < 0)
+			goto del_unicast;
+	}
+
+	if (dev->flags & IFF_PROMISC) {
+		err = dev_set_promiscuity(lowerdev, 1);
+		if (err < 0)
+			goto clear_multi;
+	}
+
+hash_add:
+	macvlan_hash_add(vlan);
+	return 0;
+
+clear_multi:
+	if (dev->flags & IFF_ALLMULTI)
+		dev_set_allmulti(lowerdev, -1);
+del_unicast:
+	if (vlan->accel_priv) {
+		lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
+							   vlan->accel_priv);
+		vlan->accel_priv = NULL;
+	} else {
+		dev_uc_del(lowerdev, dev->dev_addr);
+	}
+out:
+	return err;
+}
+
+static int macvlan_stop(struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct net_device *lowerdev = vlan->lowerdev;
+
+	if (vlan->accel_priv) {
+		lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
+							   vlan->accel_priv);
+		vlan->accel_priv = NULL;
+	}
+
+	dev_uc_unsync(lowerdev, dev);
+	dev_mc_unsync(lowerdev, dev);
+
+	if (macvlan_passthru(vlan->port)) {
+		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
+			dev_set_promiscuity(lowerdev, -1);
+		goto hash_del;
+	}
+
+	if (dev->flags & IFF_ALLMULTI)
+		dev_set_allmulti(lowerdev, -1);
+
+	if (dev->flags & IFF_PROMISC)
+		dev_set_promiscuity(lowerdev, -1);
+
+	dev_uc_del(lowerdev, dev->dev_addr);
+
+hash_del:
+	macvlan_hash_del(vlan, !dev->dismantle);
+	return 0;
+}
+
+static int macvlan_sync_address(struct net_device *dev,
+				const unsigned char *addr)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct net_device *lowerdev = vlan->lowerdev;
+	struct macvlan_port *port = vlan->port;
+	int err;
+
+	if (!(dev->flags & IFF_UP)) {
+		/* Just copy in the new address */
+		eth_hw_addr_set(dev, addr);
+	} else {
+		/* Rehash and update the device filters */
+		if (macvlan_addr_busy(vlan->port, addr))
+			return -EADDRINUSE;
+
+		if (!macvlan_passthru(port)) {
+			err = dev_uc_add(lowerdev, addr);
+			if (err)
+				return err;
+
+			dev_uc_del(lowerdev, dev->dev_addr);
+		}
+
+		macvlan_hash_change_addr(vlan, addr);
+	}
+	if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
+		/* Since addr_change isn't set, we are here due to lower
+		 * device change.  Save the lower-dev address so we can
+		 * restore it later.
+		 */
+		ether_addr_copy(vlan->port->perm_addr,
+				lowerdev->dev_addr);
+	}
+	macvlan_clear_addr_change(port);
+	return 0;
+}
+
+static int macvlan_set_mac_address(struct net_device *dev, void *p)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct sockaddr *addr = p;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	/* If the addresses are the same, this is a no-op */
+	if (ether_addr_equal(dev->dev_addr, addr->sa_data))
+		return 0;
+
+	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
+		macvlan_set_addr_change(vlan->port);
+		return dev_set_mac_address(vlan->lowerdev, addr, NULL);
+	}
+
+	if (macvlan_addr_busy(vlan->port, addr->sa_data))
+		return -EADDRINUSE;
+
+	return macvlan_sync_address(dev, addr->sa_data);
+}
+
+static void macvlan_change_rx_flags(struct net_device *dev, int change)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct net_device *lowerdev = vlan->lowerdev;
+
+	if (dev->flags & IFF_UP) {
+		if (change & IFF_ALLMULTI)
+			dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
+		if (!macvlan_passthru(vlan->port) && change & IFF_PROMISC)
+			dev_set_promiscuity(lowerdev,
+					    dev->flags & IFF_PROMISC ? 1 : -1);
+
+	}
+}
+
+static void macvlan_compute_filter(unsigned long *mc_filter,
+				   struct net_device *dev,
+				   struct macvlan_dev *vlan)
+{
+	if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
+		bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
+	} else {
+		struct netdev_hw_addr *ha;
+		DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
+
+		bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
+		netdev_for_each_mc_addr(ha, dev) {
+			__set_bit(mc_hash(vlan, ha->addr), filter);
+		}
+
+		__set_bit(mc_hash(vlan, dev->broadcast), filter);
+
+		bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
+	}
+}
+
+static void macvlan_set_mac_lists(struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+
+	macvlan_compute_filter(vlan->mc_filter, dev, vlan);
+
+	dev_uc_sync(vlan->lowerdev, dev);
+	dev_mc_sync(vlan->lowerdev, dev);
+
+	/* This is slightly inaccurate as we're including the subscription
+	 * list of vlan->lowerdev too.
+	 *
+	 * Bug alert: This only works if everyone has the same broadcast
+	 * address as lowerdev.  As soon as someone changes theirs this
+	 * will break.
+	 *
+	 * However, this is already broken as when you change your broadcast
+	 * address we don't get called.
+	 *
+	 * The solution is to maintain a list of broadcast addresses like
+	 * we do for uc/mc, if you care.
+	 */
+	macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
+}
+
+static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+
+	if (vlan->lowerdev->mtu < new_mtu)
+		return -EINVAL;
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+static int macvlan_eth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct net_device *real_dev = macvlan_dev_real_dev(dev);
+	const struct net_device_ops *ops = real_dev->netdev_ops;
+	struct ifreq ifrr;
+	int err = -EOPNOTSUPP;
+
+	strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
+	ifrr.ifr_ifru = ifr->ifr_ifru;
+
+	switch (cmd) {
+	case SIOCSHWTSTAMP:
+		if (!net_eq(dev_net(dev), &init_net))
+			break;
+		fallthrough;
+	case SIOCGHWTSTAMP:
+		if (netif_device_present(real_dev) && ops->ndo_eth_ioctl)
+			err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
+		break;
+	}
+
+	if (!err)
+		ifr->ifr_ifru = ifrr.ifr_ifru;
+
+	return err;
+}
+
+/*
+ * macvlan network devices have devices nesting below it and are a special
+ * "super class" of normal network devices; split their locks off into a
+ * separate class since they always nest.
+ */
+static struct lock_class_key macvlan_netdev_addr_lock_key;
+
+#define ALWAYS_ON_OFFLOADS \
+	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
+	 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
+
+#define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
+
+#define MACVLAN_FEATURES \
+	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
+	 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
+	 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
+	 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
+
+#define MACVLAN_STATE_MASK \
+	((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
+
+static void macvlan_set_lockdep_class(struct net_device *dev)
+{
+	netdev_lockdep_set_classes(dev);
+	lockdep_set_class(&dev->addr_list_lock,
+			  &macvlan_netdev_addr_lock_key);
+}
+
+static int macvlan_init(struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct net_device *lowerdev = vlan->lowerdev;
+	struct macvlan_port *port = vlan->port;
+
+	dev->state		= (dev->state & ~MACVLAN_STATE_MASK) |
+				  (lowerdev->state & MACVLAN_STATE_MASK);
+	dev->features 		= lowerdev->features & MACVLAN_FEATURES;
+	dev->features		|= ALWAYS_ON_FEATURES;
+	dev->hw_features	|= NETIF_F_LRO;
+	dev->vlan_features	= lowerdev->vlan_features & MACVLAN_FEATURES;
+	dev->vlan_features	|= ALWAYS_ON_OFFLOADS;
+	dev->hw_enc_features    |= dev->features;
+	netif_inherit_tso_max(dev, lowerdev);
+	dev->hard_header_len	= lowerdev->hard_header_len;
+	macvlan_set_lockdep_class(dev);
+
+	vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
+	if (!vlan->pcpu_stats)
+		return -ENOMEM;
+
+	port->count += 1;
+
+	/* Get macvlan's reference to lowerdev */
+	netdev_hold(lowerdev, &vlan->dev_tracker, GFP_KERNEL);
+
+	return 0;
+}
+
+static void macvlan_uninit(struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct macvlan_port *port = vlan->port;
+
+	free_percpu(vlan->pcpu_stats);
+
+	macvlan_flush_sources(port, vlan);
+	port->count -= 1;
+	if (!port->count)
+		macvlan_port_destroy(port->dev);
+}
+
+static void macvlan_dev_get_stats64(struct net_device *dev,
+				    struct rtnl_link_stats64 *stats)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+
+	if (vlan->pcpu_stats) {
+		struct vlan_pcpu_stats *p;
+		u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
+		u32 rx_errors = 0, tx_dropped = 0;
+		unsigned int start;
+		int i;
+
+		for_each_possible_cpu(i) {
+			p = per_cpu_ptr(vlan->pcpu_stats, i);
+			do {
+				start = u64_stats_fetch_begin_irq(&p->syncp);
+				rx_packets	= u64_stats_read(&p->rx_packets);
+				rx_bytes	= u64_stats_read(&p->rx_bytes);
+				rx_multicast	= u64_stats_read(&p->rx_multicast);
+				tx_packets	= u64_stats_read(&p->tx_packets);
+				tx_bytes	= u64_stats_read(&p->tx_bytes);
+			} while (u64_stats_fetch_retry_irq(&p->syncp, start));
+
+			stats->rx_packets	+= rx_packets;
+			stats->rx_bytes		+= rx_bytes;
+			stats->multicast	+= rx_multicast;
+			stats->tx_packets	+= tx_packets;
+			stats->tx_bytes		+= tx_bytes;
+			/* rx_errors & tx_dropped are u32, updated
+			 * without syncp protection.
+			 */
+			rx_errors	+= READ_ONCE(p->rx_errors);
+			tx_dropped	+= READ_ONCE(p->tx_dropped);
+		}
+		stats->rx_errors	= rx_errors;
+		stats->rx_dropped	= rx_errors;
+		stats->tx_dropped	= tx_dropped;
+	}
+}
+
+static int macvlan_vlan_rx_add_vid(struct net_device *dev,
+				   __be16 proto, u16 vid)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct net_device *lowerdev = vlan->lowerdev;
+
+	return vlan_vid_add(lowerdev, proto, vid);
+}
+
+static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
+				    __be16 proto, u16 vid)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct net_device *lowerdev = vlan->lowerdev;
+
+	vlan_vid_del(lowerdev, proto, vid);
+	return 0;
+}
+
+static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
+			   struct net_device *dev,
+			   const unsigned char *addr, u16 vid,
+			   u16 flags,
+			   struct netlink_ext_ack *extack)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	int err = -EINVAL;
+
+	/* Support unicast filter only on passthru devices.
+	 * Multicast filter should be allowed on all devices.
+	 */
+	if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
+		return -EOPNOTSUPP;
+
+	if (flags & NLM_F_REPLACE)
+		return -EOPNOTSUPP;
+
+	if (is_unicast_ether_addr(addr))
+		err = dev_uc_add_excl(dev, addr);
+	else if (is_multicast_ether_addr(addr))
+		err = dev_mc_add_excl(dev, addr);
+
+	return err;
+}
+
+static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
+			   struct net_device *dev,
+			   const unsigned char *addr, u16 vid,
+			   struct netlink_ext_ack *extack)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	int err = -EINVAL;
+
+	/* Support unicast filter only on passthru devices.
+	 * Multicast filter should be allowed on all devices.
+	 */
+	if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
+		return -EOPNOTSUPP;
+
+	if (is_unicast_ether_addr(addr))
+		err = dev_uc_del(dev, addr);
+	else if (is_multicast_ether_addr(addr))
+		err = dev_mc_del(dev, addr);
+
+	return err;
+}
+
+static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
+					struct ethtool_drvinfo *drvinfo)
+{
+	strscpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
+	strscpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
+}
+
+static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
+					      struct ethtool_link_ksettings *cmd)
+{
+	const struct macvlan_dev *vlan = netdev_priv(dev);
+
+	return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
+}
+
+static int macvlan_ethtool_get_ts_info(struct net_device *dev,
+				       struct ethtool_ts_info *info)
+{
+	struct net_device *real_dev = macvlan_dev_real_dev(dev);
+	const struct ethtool_ops *ops = real_dev->ethtool_ops;
+	struct phy_device *phydev = real_dev->phydev;
+
+	if (phy_has_tsinfo(phydev)) {
+		return phy_ts_info(phydev, info);
+	} else if (ops->get_ts_info) {
+		return ops->get_ts_info(real_dev, info);
+	} else {
+		info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
+			SOF_TIMESTAMPING_SOFTWARE;
+		info->phc_index = -1;
+	}
+
+	return 0;
+}
+
+static netdev_features_t macvlan_fix_features(struct net_device *dev,
+					      netdev_features_t features)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	netdev_features_t lowerdev_features = vlan->lowerdev->features;
+	netdev_features_t mask;
+
+	features |= NETIF_F_ALL_FOR_ALL;
+	features &= (vlan->set_features | ~MACVLAN_FEATURES);
+	mask = features;
+
+	lowerdev_features &= (features | ~NETIF_F_LRO);
+	features = netdev_increment_features(lowerdev_features, features, mask);
+	features |= ALWAYS_ON_FEATURES;
+	features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
+
+	return features;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void macvlan_dev_poll_controller(struct net_device *dev)
+{
+	return;
+}
+
+static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct net_device *real_dev = vlan->lowerdev;
+	struct netpoll *netpoll;
+	int err;
+
+	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
+	err = -ENOMEM;
+	if (!netpoll)
+		goto out;
+
+	err = __netpoll_setup(netpoll, real_dev);
+	if (err) {
+		kfree(netpoll);
+		goto out;
+	}
+
+	vlan->netpoll = netpoll;
+
+out:
+	return err;
+}
+
+static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct netpoll *netpoll = vlan->netpoll;
+
+	if (!netpoll)
+		return;
+
+	vlan->netpoll = NULL;
+
+	__netpoll_free(netpoll);
+}
+#endif	/* CONFIG_NET_POLL_CONTROLLER */
+
+static int macvlan_dev_get_iflink(const struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+
+	return vlan->lowerdev->ifindex;
+}
+
+static const struct ethtool_ops macvlan_ethtool_ops = {
+	.get_link		= ethtool_op_get_link,
+	.get_link_ksettings	= macvlan_ethtool_get_link_ksettings,
+	.get_drvinfo		= macvlan_ethtool_get_drvinfo,
+	.get_ts_info		= macvlan_ethtool_get_ts_info,
+};
+
+static const struct net_device_ops macvlan_netdev_ops = {
+	.ndo_init		= macvlan_init,
+	.ndo_uninit		= macvlan_uninit,
+	.ndo_open		= macvlan_open,
+	.ndo_stop		= macvlan_stop,
+	.ndo_start_xmit		= macvlan_start_xmit,
+	.ndo_change_mtu		= macvlan_change_mtu,
+	.ndo_eth_ioctl		= macvlan_eth_ioctl,
+	.ndo_fix_features	= macvlan_fix_features,
+	.ndo_change_rx_flags	= macvlan_change_rx_flags,
+	.ndo_set_mac_address	= macvlan_set_mac_address,
+	.ndo_set_rx_mode	= macvlan_set_mac_lists,
+	.ndo_get_stats64	= macvlan_dev_get_stats64,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_vlan_rx_add_vid	= macvlan_vlan_rx_add_vid,
+	.ndo_vlan_rx_kill_vid	= macvlan_vlan_rx_kill_vid,
+	.ndo_fdb_add		= macvlan_fdb_add,
+	.ndo_fdb_del		= macvlan_fdb_del,
+	.ndo_fdb_dump		= ndo_dflt_fdb_dump,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= macvlan_dev_poll_controller,
+	.ndo_netpoll_setup	= macvlan_dev_netpoll_setup,
+	.ndo_netpoll_cleanup	= macvlan_dev_netpoll_cleanup,
+#endif
+	.ndo_get_iflink		= macvlan_dev_get_iflink,
+	.ndo_features_check	= passthru_features_check,
+};
+
+static void macvlan_dev_free(struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+
+	/* Get rid of the macvlan's reference to lowerdev */
+	netdev_put(vlan->lowerdev, &vlan->dev_tracker);
+}
+
+void macvlan_common_setup(struct net_device *dev)
+{
+	ether_setup(dev);
+
+	/* ether_setup() has set dev->min_mtu to ETH_MIN_MTU. */
+	dev->max_mtu		= ETH_MAX_MTU;
+	dev->priv_flags	       &= ~IFF_TX_SKB_SHARING;
+	netif_keep_dst(dev);
+	dev->priv_flags	       |= IFF_UNICAST_FLT | IFF_CHANGE_PROTO_DOWN;
+	dev->netdev_ops		= &macvlan_netdev_ops;
+	dev->needs_free_netdev	= true;
+	dev->priv_destructor	= macvlan_dev_free;
+	dev->header_ops		= &macvlan_hard_header_ops;
+	dev->ethtool_ops	= &macvlan_ethtool_ops;
+}
+EXPORT_SYMBOL_GPL(macvlan_common_setup);
+
+static void macvlan_setup(struct net_device *dev)
+{
+	macvlan_common_setup(dev);
+	dev->priv_flags |= IFF_NO_QUEUE;
+}
+
+static int macvlan_port_create(struct net_device *dev)
+{
+	struct macvlan_port *port;
+	unsigned int i;
+	int err;
+
+	if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
+		return -EINVAL;
+
+	if (netdev_is_rx_handler_busy(dev))
+		return -EBUSY;
+
+	port = kzalloc(sizeof(*port), GFP_KERNEL);
+	if (port == NULL)
+		return -ENOMEM;
+
+	port->dev = dev;
+	ether_addr_copy(port->perm_addr, dev->dev_addr);
+	INIT_LIST_HEAD(&port->vlans);
+	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
+		INIT_HLIST_HEAD(&port->vlan_hash[i]);
+	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
+		INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
+
+	port->bc_queue_len_used = 0;
+	skb_queue_head_init(&port->bc_queue);
+	INIT_WORK(&port->bc_work, macvlan_process_broadcast);
+
+	err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
+	if (err)
+		kfree(port);
+	else
+		dev->priv_flags |= IFF_MACVLAN_PORT;
+	return err;
+}
+
+static void macvlan_port_destroy(struct net_device *dev)
+{
+	struct macvlan_port *port = macvlan_port_get_rtnl(dev);
+	struct sk_buff *skb;
+
+	dev->priv_flags &= ~IFF_MACVLAN_PORT;
+	netdev_rx_handler_unregister(dev);
+
+	/* After this point, no packet can schedule bc_work anymore,
+	 * but we need to cancel it and purge left skbs if any.
+	 */
+	cancel_work_sync(&port->bc_work);
+
+	while ((skb = __skb_dequeue(&port->bc_queue))) {
+		const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
+
+		if (src)
+			dev_put(src->dev);
+
+		kfree_skb(skb);
+	}
+
+	/* If the lower device address has been changed by passthru
+	 * macvlan, put it back.
+	 */
+	if (macvlan_passthru(port) &&
+	    !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
+		struct sockaddr sa;
+
+		sa.sa_family = port->dev->type;
+		memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
+		dev_set_mac_address(port->dev, &sa, NULL);
+	}
+
+	kfree(port);
+}
+
+static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
+			    struct netlink_ext_ack *extack)
+{
+	struct nlattr *nla, *head;
+	int rem, len;
+
+	if (tb[IFLA_ADDRESS]) {
+		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
+			return -EINVAL;
+		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
+			return -EADDRNOTAVAIL;
+	}
+
+	if (!data)
+		return 0;
+
+	if (data[IFLA_MACVLAN_FLAGS] &&
+	    nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
+						      MACVLAN_FLAG_NODST))
+		return -EINVAL;
+
+	if (data[IFLA_MACVLAN_MODE]) {
+		switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
+		case MACVLAN_MODE_PRIVATE:
+		case MACVLAN_MODE_VEPA:
+		case MACVLAN_MODE_BRIDGE:
+		case MACVLAN_MODE_PASSTHRU:
+		case MACVLAN_MODE_SOURCE:
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	if (data[IFLA_MACVLAN_MACADDR_MODE]) {
+		switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
+		case MACVLAN_MACADDR_ADD:
+		case MACVLAN_MACADDR_DEL:
+		case MACVLAN_MACADDR_FLUSH:
+		case MACVLAN_MACADDR_SET:
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	if (data[IFLA_MACVLAN_MACADDR]) {
+		if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
+			return -EINVAL;
+
+		if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
+			return -EADDRNOTAVAIL;
+	}
+
+	if (data[IFLA_MACVLAN_MACADDR_DATA]) {
+		head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
+		len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
+
+		nla_for_each_attr(nla, head, len, rem) {
+			if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
+			    nla_len(nla) != ETH_ALEN)
+				return -EINVAL;
+
+			if (!is_valid_ether_addr(nla_data(nla)))
+				return -EADDRNOTAVAIL;
+		}
+	}
+
+	if (data[IFLA_MACVLAN_MACADDR_COUNT])
+		return -EINVAL;
+
+	return 0;
+}
+
+/*
+ * reconfigure list of remote source mac address
+ * (only for macvlan devices in source mode)
+ * Note regarding alignment: all netlink data is aligned to 4 Byte, which
+ * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
+ */
+static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
+				      struct nlattr *data[])
+{
+	char *addr = NULL;
+	int ret, rem, len;
+	struct nlattr *nla, *head;
+	struct macvlan_source_entry *entry;
+
+	if (data[IFLA_MACVLAN_MACADDR])
+		addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
+
+	if (mode == MACVLAN_MACADDR_ADD) {
+		if (!addr)
+			return -EINVAL;
+
+		return macvlan_hash_add_source(vlan, addr);
+
+	} else if (mode == MACVLAN_MACADDR_DEL) {
+		if (!addr)
+			return -EINVAL;
+
+		entry = macvlan_hash_lookup_source(vlan, addr);
+		if (entry) {
+			macvlan_hash_del_source(entry);
+			vlan->macaddr_count--;
+		}
+	} else if (mode == MACVLAN_MACADDR_FLUSH) {
+		macvlan_flush_sources(vlan->port, vlan);
+	} else if (mode == MACVLAN_MACADDR_SET) {
+		macvlan_flush_sources(vlan->port, vlan);
+
+		if (addr) {
+			ret = macvlan_hash_add_source(vlan, addr);
+			if (ret)
+				return ret;
+		}
+
+		if (!data[IFLA_MACVLAN_MACADDR_DATA])
+			return 0;
+
+		head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
+		len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
+
+		nla_for_each_attr(nla, head, len, rem) {
+			addr = nla_data(nla);
+			ret = macvlan_hash_add_source(vlan, addr);
+			if (ret)
+				return ret;
+		}
+	} else {
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
+			   struct nlattr *tb[], struct nlattr *data[],
+			   struct netlink_ext_ack *extack)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct macvlan_port *port;
+	struct net_device *lowerdev;
+	int err;
+	int macmode;
+	bool create = false;
+
+	if (!tb[IFLA_LINK])
+		return -EINVAL;
+
+	lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
+	if (lowerdev == NULL)
+		return -ENODEV;
+
+	/* When creating macvlans or macvtaps on top of other macvlans - use
+	 * the real device as the lowerdev.
+	 */
+	if (netif_is_macvlan(lowerdev))
+		lowerdev = macvlan_dev_real_dev(lowerdev);
+
+	if (!tb[IFLA_MTU])
+		dev->mtu = lowerdev->mtu;
+	else if (dev->mtu > lowerdev->mtu)
+		return -EINVAL;
+
+	/* MTU range: 68 - lowerdev->max_mtu */
+	dev->min_mtu = ETH_MIN_MTU;
+	dev->max_mtu = lowerdev->max_mtu;
+
+	if (!tb[IFLA_ADDRESS])
+		eth_hw_addr_random(dev);
+
+	if (!netif_is_macvlan_port(lowerdev)) {
+		err = macvlan_port_create(lowerdev);
+		if (err < 0)
+			return err;
+		create = true;
+	}
+	port = macvlan_port_get_rtnl(lowerdev);
+
+	/* Only 1 macvlan device can be created in passthru mode */
+	if (macvlan_passthru(port)) {
+		/* The macvlan port must be not created this time,
+		 * still goto destroy_macvlan_port for readability.
+		 */
+		err = -EINVAL;
+		goto destroy_macvlan_port;
+	}
+
+	vlan->lowerdev = lowerdev;
+	vlan->dev      = dev;
+	vlan->port     = port;
+	vlan->set_features = MACVLAN_FEATURES;
+
+	vlan->mode     = MACVLAN_MODE_VEPA;
+	if (data && data[IFLA_MACVLAN_MODE])
+		vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
+
+	if (data && data[IFLA_MACVLAN_FLAGS])
+		vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
+
+	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
+		if (port->count) {
+			err = -EINVAL;
+			goto destroy_macvlan_port;
+		}
+		macvlan_set_passthru(port);
+		eth_hw_addr_inherit(dev, lowerdev);
+	}
+
+	if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
+		if (vlan->mode != MACVLAN_MODE_SOURCE) {
+			err = -EINVAL;
+			goto destroy_macvlan_port;
+		}
+		macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
+		err = macvlan_changelink_sources(vlan, macmode, data);
+		if (err)
+			goto destroy_macvlan_port;
+	}
+
+	vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
+	if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
+		vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
+
+	err = register_netdevice(dev);
+	if (err < 0)
+		goto destroy_macvlan_port;
+
+	dev->priv_flags |= IFF_MACVLAN;
+	err = netdev_upper_dev_link(lowerdev, dev, extack);
+	if (err)
+		goto unregister_netdev;
+
+	list_add_tail_rcu(&vlan->list, &port->vlans);
+	update_port_bc_queue_len(vlan->port);
+	netif_stacked_transfer_operstate(lowerdev, dev);
+	linkwatch_fire_event(dev);
+
+	return 0;
+
+unregister_netdev:
+	/* macvlan_uninit would free the macvlan port */
+	unregister_netdevice(dev);
+	return err;
+destroy_macvlan_port:
+	/* the macvlan port may be freed by macvlan_uninit when fail to register.
+	 * so we destroy the macvlan port only when it's valid.
+	 */
+	if (create && macvlan_port_get_rtnl(lowerdev)) {
+		macvlan_flush_sources(port, vlan);
+		macvlan_port_destroy(port->dev);
+	}
+	return err;
+}
+EXPORT_SYMBOL_GPL(macvlan_common_newlink);
+
+static int macvlan_newlink(struct net *src_net, struct net_device *dev,
+			   struct nlattr *tb[], struct nlattr *data[],
+			   struct netlink_ext_ack *extack)
+{
+	return macvlan_common_newlink(src_net, dev, tb, data, extack);
+}
+
+void macvlan_dellink(struct net_device *dev, struct list_head *head)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+
+	if (vlan->mode == MACVLAN_MODE_SOURCE)
+		macvlan_flush_sources(vlan->port, vlan);
+	list_del_rcu(&vlan->list);
+	update_port_bc_queue_len(vlan->port);
+	unregister_netdevice_queue(dev, head);
+	netdev_upper_dev_unlink(vlan->lowerdev, dev);
+}
+EXPORT_SYMBOL_GPL(macvlan_dellink);
+
+static int macvlan_changelink(struct net_device *dev,
+			      struct nlattr *tb[], struct nlattr *data[],
+			      struct netlink_ext_ack *extack)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	enum macvlan_mode mode;
+	bool set_mode = false;
+	enum macvlan_macaddr_mode macmode;
+	int ret;
+
+	/* Validate mode, but don't set yet: setting flags may fail. */
+	if (data && data[IFLA_MACVLAN_MODE]) {
+		set_mode = true;
+		mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
+		/* Passthrough mode can't be set or cleared dynamically */
+		if ((mode == MACVLAN_MODE_PASSTHRU) !=
+		    (vlan->mode == MACVLAN_MODE_PASSTHRU))
+			return -EINVAL;
+		if (vlan->mode == MACVLAN_MODE_SOURCE &&
+		    vlan->mode != mode)
+			macvlan_flush_sources(vlan->port, vlan);
+	}
+
+	if (data && data[IFLA_MACVLAN_FLAGS]) {
+		__u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
+		bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
+		if (macvlan_passthru(vlan->port) && promisc) {
+			int err;
+
+			if (flags & MACVLAN_FLAG_NOPROMISC)
+				err = dev_set_promiscuity(vlan->lowerdev, -1);
+			else
+				err = dev_set_promiscuity(vlan->lowerdev, 1);
+			if (err < 0)
+				return err;
+		}
+		vlan->flags = flags;
+	}
+
+	if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
+		vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
+		update_port_bc_queue_len(vlan->port);
+	}
+
+	if (set_mode)
+		vlan->mode = mode;
+	if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
+		if (vlan->mode != MACVLAN_MODE_SOURCE)
+			return -EINVAL;
+		macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
+		ret = macvlan_changelink_sources(vlan, macmode, data);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+
+static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
+{
+	if (vlan->macaddr_count == 0)
+		return 0;
+	return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
+		+ vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
+}
+
+static size_t macvlan_get_size(const struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+
+	return (0
+		+ nla_total_size(4) /* IFLA_MACVLAN_MODE */
+		+ nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
+		+ nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
+		+ macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
+		+ nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
+		+ nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
+		);
+}
+
+static int macvlan_fill_info_macaddr(struct sk_buff *skb,
+				     const struct macvlan_dev *vlan,
+				     const int i)
+{
+	struct hlist_head *h = &vlan->port->vlan_source_hash[i];
+	struct macvlan_source_entry *entry;
+
+	hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
+		if (entry->vlan != vlan)
+			continue;
+		if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
+			return 1;
+	}
+	return 0;
+}
+
+static int macvlan_fill_info(struct sk_buff *skb,
+				const struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct macvlan_port *port = vlan->port;
+	int i;
+	struct nlattr *nest;
+
+	if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
+		goto nla_put_failure;
+	if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
+		goto nla_put_failure;
+	if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
+		goto nla_put_failure;
+	if (vlan->macaddr_count > 0) {
+		nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
+		if (nest == NULL)
+			goto nla_put_failure;
+
+		for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
+			if (macvlan_fill_info_macaddr(skb, vlan, i))
+				goto nla_put_failure;
+		}
+		nla_nest_end(skb, nest);
+	}
+	if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
+		goto nla_put_failure;
+	if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+
+static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
+	[IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
+	[IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
+	[IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
+	[IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
+	[IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
+	[IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
+	[IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
+	[IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
+};
+
+int macvlan_link_register(struct rtnl_link_ops *ops)
+{
+	/* common fields */
+	ops->validate		= macvlan_validate;
+	ops->maxtype		= IFLA_MACVLAN_MAX;
+	ops->policy		= macvlan_policy;
+	ops->changelink		= macvlan_changelink;
+	ops->get_size		= macvlan_get_size;
+	ops->fill_info		= macvlan_fill_info;
+
+	return rtnl_link_register(ops);
+};
+EXPORT_SYMBOL_GPL(macvlan_link_register);
+
+static struct net *macvlan_get_link_net(const struct net_device *dev)
+{
+	return dev_net(macvlan_dev_real_dev(dev));
+}
+
+static struct rtnl_link_ops macvlan_link_ops = {
+	.kind		= "macvlan",
+	.setup		= macvlan_setup,
+	.newlink	= macvlan_newlink,
+	.dellink	= macvlan_dellink,
+	.get_link_net	= macvlan_get_link_net,
+	.priv_size      = sizeof(struct macvlan_dev),
+};
+
+static void update_port_bc_queue_len(struct macvlan_port *port)
+{
+	u32 max_bc_queue_len_req = 0;
+	struct macvlan_dev *vlan;
+
+	list_for_each_entry(vlan, &port->vlans, list) {
+		if (vlan->bc_queue_len_req > max_bc_queue_len_req)
+			max_bc_queue_len_req = vlan->bc_queue_len_req;
+	}
+	port->bc_queue_len_used = max_bc_queue_len_req;
+}
+
+static int macvlan_device_event(struct notifier_block *unused,
+				unsigned long event, void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct macvlan_dev *vlan, *next;
+	struct macvlan_port *port;
+	LIST_HEAD(list_kill);
+
+	if (!netif_is_macvlan_port(dev))
+		return NOTIFY_DONE;
+
+	port = macvlan_port_get_rtnl(dev);
+
+	switch (event) {
+	case NETDEV_UP:
+	case NETDEV_DOWN:
+	case NETDEV_CHANGE:
+		list_for_each_entry(vlan, &port->vlans, list)
+			netif_stacked_transfer_operstate(vlan->lowerdev,
+							 vlan->dev);
+		break;
+	case NETDEV_FEAT_CHANGE:
+		list_for_each_entry(vlan, &port->vlans, list) {
+			netif_inherit_tso_max(vlan->dev, dev);
+			netdev_update_features(vlan->dev);
+		}
+		break;
+	case NETDEV_CHANGEMTU:
+		list_for_each_entry(vlan, &port->vlans, list) {
+			if (vlan->dev->mtu <= dev->mtu)
+				continue;
+			dev_set_mtu(vlan->dev, dev->mtu);
+		}
+		break;
+	case NETDEV_CHANGEADDR:
+		if (!macvlan_passthru(port))
+			return NOTIFY_DONE;
+
+		vlan = list_first_entry_or_null(&port->vlans,
+						struct macvlan_dev,
+						list);
+
+		if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
+			return NOTIFY_BAD;
+
+		break;
+	case NETDEV_UNREGISTER:
+		/* twiddle thumbs on netns device moves */
+		if (dev->reg_state != NETREG_UNREGISTERING)
+			break;
+
+		list_for_each_entry_safe(vlan, next, &port->vlans, list)
+			vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
+		unregister_netdevice_many(&list_kill);
+		break;
+	case NETDEV_PRE_TYPE_CHANGE:
+		/* Forbid underlying device to change its type. */
+		return NOTIFY_BAD;
+
+	case NETDEV_NOTIFY_PEERS:
+	case NETDEV_BONDING_FAILOVER:
+	case NETDEV_RESEND_IGMP:
+		/* Propagate to all vlans */
+		list_for_each_entry(vlan, &port->vlans, list)
+			call_netdevice_notifiers(event, vlan->dev);
+	}
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block macvlan_notifier_block __read_mostly = {
+	.notifier_call	= macvlan_device_event,
+};
+
+static int __init macvlan_init_module(void)
+{
+	int err;
+
+	register_netdevice_notifier(&macvlan_notifier_block);
+
+	err = macvlan_link_register(&macvlan_link_ops);
+	if (err < 0)
+		goto err1;
+	return 0;
+err1:
+	unregister_netdevice_notifier(&macvlan_notifier_block);
+	return err;
+}
+
+static void __exit macvlan_cleanup_module(void)
+{
+	rtnl_link_unregister(&macvlan_link_ops);
+	unregister_netdevice_notifier(&macvlan_notifier_block);
+}
+
+module_init(macvlan_init_module);
+module_exit(macvlan_cleanup_module);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_DESCRIPTION("Driver for MAC address based VLANs");
+MODULE_ALIAS_RTNL_LINK("macvlan");