[net-next-2.6.git] / drivers / net / macvlan.c

/*
 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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/list.h>
#include <linux/notifier.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_arp.h>
#include <linux/if_link.h>
#include <linux/if_macvlan.h>
#include <net/rtnetlink.h>

#define MACVLAN_HASH_SIZE	(1 << BITS_PER_BYTE)

struct macvlan_port {
	struct net_device	*dev;
	struct hlist_head	vlan_hash[MACVLAN_HASH_SIZE];
	struct list_head	vlans;
};

struct macvlan_dev {
	struct net_device	*dev;
	struct list_head	list;
	struct hlist_node	hlist;
	struct macvlan_port	*port;
	struct net_device	*lowerdev;
};


static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
					       const unsigned char *addr)
{
	struct macvlan_dev *vlan;
	struct hlist_node *n;

	hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
		if (!compare_ether_addr(vlan->dev->dev_addr, addr))
			return vlan;
	}
	return NULL;
}

static void macvlan_broadcast(struct sk_buff *skb,
			      const struct macvlan_port *port)
{
	const struct ethhdr *eth = eth_hdr(skb);
	const struct macvlan_dev *vlan;
	struct hlist_node *n;
	struct net_device *dev;
	struct sk_buff *nskb;
	unsigned int i;

	for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
		hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
			dev = vlan->dev;

			nskb = skb_clone(skb, GFP_ATOMIC);
			if (nskb == NULL) {
				dev->stats.rx_errors++;
				dev->stats.rx_dropped++;
				continue;
			}

			dev->stats.rx_bytes += skb->len + ETH_HLEN;
			dev->stats.rx_packets++;
			dev->stats.multicast++;
			dev->last_rx = jiffies;

			nskb->dev = dev;
			if (!compare_ether_addr(eth->h_dest, dev->broadcast))
				nskb->pkt_type = PACKET_BROADCAST;
			else
				nskb->pkt_type = PACKET_MULTICAST;

			netif_rx(nskb);
		}
	}
}

/* called under rcu_read_lock() from netif_receive_skb */
static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
{
	const struct ethhdr *eth = eth_hdr(skb);
	const struct macvlan_port *port;
	const struct macvlan_dev *vlan;
	struct net_device *dev;

	port = rcu_dereference(skb->dev->macvlan_port);
	if (port == NULL)
		return skb;

	if (is_multicast_ether_addr(eth->h_dest)) {
		macvlan_broadcast(skb, port);
		return skb;
	}

	vlan = macvlan_hash_lookup(port, eth->h_dest);
	if (vlan == NULL)
		return skb;

	dev = vlan->dev;
	if (unlikely(!(dev->flags & IFF_UP))) {
		kfree_skb(skb);
		return NULL;
	}

	skb = skb_share_check(skb, GFP_ATOMIC);
	if (skb == NULL) {
		dev->stats.rx_errors++;
		dev->stats.rx_dropped++;
		return NULL;
	}

	dev->stats.rx_bytes += skb->len + ETH_HLEN;
	dev->stats.rx_packets++;
	dev->last_rx = jiffies;

	skb->dev = dev;
	skb->pkt_type = PACKET_HOST;

	netif_rx(skb);
	return NULL;
}

static int macvlan_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	const struct macvlan_dev *vlan = netdev_priv(dev);
	unsigned int len = skb->len;
	int ret;

	skb->dev = vlan->lowerdev;
	ret = dev_queue_xmit(skb);

	if (likely(ret == NET_XMIT_SUCCESS)) {
		dev->stats.tx_packets++;
		dev->stats.tx_bytes += len;
	} else {
		dev->stats.tx_errors++;
		dev->stats.tx_aborted_errors++;
	}
	return NETDEV_TX_OK;
}

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,
	.rebuild	= eth_rebuild_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 macvlan_port *port = vlan->port;
	struct net_device *lowerdev = vlan->lowerdev;
	int err;

	err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN);
	if (err < 0)
		goto out;
	if (dev->flags & IFF_ALLMULTI) {
		err = dev_set_allmulti(lowerdev, 1);
		if (err < 0)
			goto del_unicast;
	}

	hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]);
	return 0;

del_unicast:
	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
out:
	return err;
}

static int macvlan_stop(struct net_device *dev)
{
	struct macvlan_dev *vlan = netdev_priv(dev);
	struct net_device *lowerdev = vlan->lowerdev;

	dev_mc_unsync(lowerdev, dev);
	if (dev->flags & IFF_ALLMULTI)
		dev_set_allmulti(lowerdev, -1);

	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);

	hlist_del_rcu(&vlan->hlist);
	synchronize_rcu();
	return 0;
}

static int macvlan_set_mac_address(struct net_device *dev, void *p)
{
	struct macvlan_dev *vlan = netdev_priv(dev);
	struct net_device *lowerdev = vlan->lowerdev;
	struct sockaddr *addr = p;
	int err;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	if (!(dev->flags & IFF_UP))
		goto out;

	err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN);
	if (err < 0)
		return err;
	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);

out:
	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
	return 0;
}

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 (change & IFF_ALLMULTI)
		dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
}

static void macvlan_set_multicast_list(struct net_device *dev)
{
	struct macvlan_dev *vlan = netdev_priv(dev);

	dev_mc_sync(vlan->lowerdev, dev);
}

static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
{
	struct macvlan_dev *vlan = netdev_priv(dev);

	if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
		return -EINVAL;
	dev->mtu = new_mtu;
	return 0;
}

/*
 * 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_xmit_lock_key;

#define MACVLAN_FEATURES \
	(NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
	 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
	 NETIF_F_TSO_ECN | NETIF_F_TSO6)

#define MACVLAN_STATE_MASK \
	((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))

static void macvlan_set_lockdep_class_one(struct net_device *dev,
					  struct netdev_queue *txq,
					  void *_unused)
{
	lockdep_set_class(&txq->_xmit_lock,
			  &macvlan_netdev_xmit_lock_key);
}

static void macvlan_set_lockdep_class(struct net_device *dev)
{
	netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
}

static int macvlan_init(struct net_device *dev)
{
	struct macvlan_dev *vlan = netdev_priv(dev);
	const struct net_device *lowerdev = vlan->lowerdev;

	dev->state		= (dev->state & ~MACVLAN_STATE_MASK) |
				  (lowerdev->state & MACVLAN_STATE_MASK);
	dev->features 		= lowerdev->features & MACVLAN_FEATURES;
	dev->iflink		= lowerdev->ifindex;

	macvlan_set_lockdep_class(dev);

	return 0;
}

static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
					struct ethtool_drvinfo *drvinfo)
{
	snprintf(drvinfo->driver, 32, "macvlan");
	snprintf(drvinfo->version, 32, "0.1");
}

static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
{
	const struct macvlan_dev *vlan = netdev_priv(dev);
	struct net_device *lowerdev = vlan->lowerdev;

	if (lowerdev->ethtool_ops->get_rx_csum == NULL)
		return 0;
	return lowerdev->ethtool_ops->get_rx_csum(lowerdev);
}

static const struct ethtool_ops macvlan_ethtool_ops = {
	.get_link		= ethtool_op_get_link,
	.get_rx_csum		= macvlan_ethtool_get_rx_csum,
	.get_drvinfo		= macvlan_ethtool_get_drvinfo,
};

static void macvlan_setup(struct net_device *dev)
{
	ether_setup(dev);

	dev->init		= macvlan_init;
	dev->open		= macvlan_open;
	dev->stop		= macvlan_stop;
	dev->change_mtu		= macvlan_change_mtu;
	dev->change_rx_flags	= macvlan_change_rx_flags;
	dev->set_mac_address	= macvlan_set_mac_address;
	dev->set_multicast_list	= macvlan_set_multicast_list;
	dev->hard_start_xmit	= macvlan_hard_start_xmit;
	dev->destructor		= free_netdev;
	dev->header_ops		= &macvlan_hard_header_ops,
	dev->ethtool_ops	= &macvlan_ethtool_ops;
	dev->tx_queue_len	= 0;
}

static int macvlan_port_create(struct net_device *dev)
{
	struct macvlan_port *port;
	unsigned int i;

	if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
		return -EINVAL;

	port = kzalloc(sizeof(*port), GFP_KERNEL);
	if (port == NULL)
		return -ENOMEM;

	port->dev = dev;
	INIT_LIST_HEAD(&port->vlans);
	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
		INIT_HLIST_HEAD(&port->vlan_hash[i]);
	rcu_assign_pointer(dev->macvlan_port, port);
	return 0;
}

static void macvlan_port_destroy(struct net_device *dev)
{
	struct macvlan_port *port = dev->macvlan_port;

	rcu_assign_pointer(dev->macvlan_port, NULL);
	synchronize_rcu();
	kfree(port);
}

static void macvlan_transfer_operstate(struct net_device *dev)
{
	struct macvlan_dev *vlan = netdev_priv(dev);
	const struct net_device *lowerdev = vlan->lowerdev;

	if (lowerdev->operstate == IF_OPER_DORMANT)
		netif_dormant_on(dev);
	else
		netif_dormant_off(dev);

	if (netif_carrier_ok(lowerdev)) {
		if (!netif_carrier_ok(dev))
			netif_carrier_on(dev);
	} else {
		if (netif_carrier_ok(dev))
			netif_carrier_off(dev);
	}
}

static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
{
	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;
	}
	return 0;
}

static int macvlan_newlink(struct net_device *dev,
			   struct nlattr *tb[], struct nlattr *data[])
{
	struct macvlan_dev *vlan = netdev_priv(dev);
	struct macvlan_port *port;
	struct net_device *lowerdev;
	int err;

	if (!tb[IFLA_LINK])
		return -EINVAL;

	lowerdev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
	if (lowerdev == NULL)
		return -ENODEV;

	/* Don't allow macvlans on top of other macvlans - its not really
	 * wrong, but lockdep can't handle it and its not useful for anything
	 * you couldn't do directly on top of the real device.
	 */
	if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops)
		return -ENODEV;

	if (!tb[IFLA_MTU])
		dev->mtu = lowerdev->mtu;
	else if (dev->mtu > lowerdev->mtu)
		return -EINVAL;

	if (!tb[IFLA_ADDRESS])
		random_ether_addr(dev->dev_addr);

	if (lowerdev->macvlan_port == NULL) {
		err = macvlan_port_create(lowerdev);
		if (err < 0)
			return err;
	}
	port = lowerdev->macvlan_port;

	vlan->lowerdev = lowerdev;
	vlan->dev      = dev;
	vlan->port     = port;

	err = register_netdevice(dev);
	if (err < 0)
		return err;

	list_add_tail(&vlan->list, &port->vlans);
	macvlan_transfer_operstate(dev);
	return 0;
}

static void macvlan_dellink(struct net_device *dev)
{
	struct macvlan_dev *vlan = netdev_priv(dev);
	struct macvlan_port *port = vlan->port;

	list_del(&vlan->list);
	unregister_netdevice(dev);

	if (list_empty(&port->vlans))
		macvlan_port_destroy(port->dev);
}

static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
	.kind		= "macvlan",
	.priv_size	= sizeof(struct macvlan_dev),
	.setup		= macvlan_setup,
	.validate	= macvlan_validate,
	.newlink	= macvlan_newlink,
	.dellink	= macvlan_dellink,
};

static int macvlan_device_event(struct notifier_block *unused,
				unsigned long event, void *ptr)
{
	struct net_device *dev = ptr;
	struct macvlan_dev *vlan, *next;
	struct macvlan_port *port;

	port = dev->macvlan_port;
	if (port == NULL)
		return NOTIFY_DONE;

	switch (event) {
	case NETDEV_CHANGE:
		list_for_each_entry(vlan, &port->vlans, list)
			macvlan_transfer_operstate(vlan->dev);
		break;
	case NETDEV_FEAT_CHANGE:
		list_for_each_entry(vlan, &port->vlans, list) {
			vlan->dev->features = dev->features & MACVLAN_FEATURES;
			netdev_features_change(vlan->dev);
		}
		break;
	case NETDEV_UNREGISTER:
		list_for_each_entry_safe(vlan, next, &port->vlans, list)
			macvlan_dellink(vlan->dev);
		break;
	}
	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);
	macvlan_handle_frame_hook = macvlan_handle_frame;

	err = rtnl_link_register(&macvlan_link_ops);
	if (err < 0)
		goto err1;
	return 0;
err1:
	macvlan_handle_frame_hook = NULL;
	unregister_netdevice_notifier(&macvlan_notifier_block);
	return err;
}

static void __exit macvlan_cleanup_module(void)
{
	rtnl_link_unregister(&macvlan_link_ops);
	macvlan_handle_frame_hook = NULL;
	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");
Commit	Line	Data
b863ceb7 PM	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/list.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_link.h>
	30	#include <linux/if_macvlan.h>
	31	#include <net/rtnetlink.h>
	32
	33	#define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
	34
	35	struct macvlan_port {
	36	struct net_device *dev;
	37	struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
	38	struct list_head vlans;
	39	};
	40
	41	struct macvlan_dev {
	42	struct net_device *dev;
	43	struct list_head list;
	44	struct hlist_node hlist;
	45	struct macvlan_port *port;
	46	struct net_device *lowerdev;
	47	};
	48
	49
	50	static struct macvlan_dev macvlan_hash_lookup(const struct macvlan_port port,
	51	const unsigned char *addr)
	52	{
	53	struct macvlan_dev *vlan;
	54	struct hlist_node *n;
	55
	56	hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
	57	if (!compare_ether_addr(vlan->dev->dev_addr, addr))
	58	return vlan;
	59	}
	60	return NULL;
	61	}
	62
	63	static void macvlan_broadcast(struct sk_buff *skb,
	64	const struct macvlan_port *port)
65	{
66	const struct ethhdr *eth = eth_hdr(skb);
67	const struct macvlan_dev *vlan;
68	struct hlist_node *n;
69	struct net_device *dev;
70	struct sk_buff *nskb;
71	unsigned int i;
72
73	for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
74	hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
75	dev = vlan->dev;
b863ceb7 PM	76
	77	nskb = skb_clone(skb, GFP_ATOMIC);
	78	if (nskb == NULL) {
	79	dev->stats.rx_errors++;
	80	dev->stats.rx_dropped++;
	81	continue;
	82	}
	83
	84	dev->stats.rx_bytes += skb->len + ETH_HLEN;
	85	dev->stats.rx_packets++;
	86	dev->stats.multicast++;
	87	dev->last_rx = jiffies;
	88
	89	nskb->dev = dev;
	90	if (!compare_ether_addr(eth->h_dest, dev->broadcast))
	91	nskb->pkt_type = PACKET_BROADCAST;
	92	else
	93	nskb->pkt_type = PACKET_MULTICAST;
	94
	95	netif_rx(nskb);
	96	}
	97	}
	98	}
	99
	100	/* called under rcu_read_lock() from netif_receive_skb */
	101	static struct sk_buff macvlan_handle_frame(struct sk_buff skb)
	102	{
	103	const struct ethhdr *eth = eth_hdr(skb);
	104	const struct macvlan_port *port;
	105	const struct macvlan_dev *vlan;
	106	struct net_device *dev;
	107
	108	port = rcu_dereference(skb->dev->macvlan_port);
	109	if (port == NULL)
	110	return skb;
	111
	112	if (is_multicast_ether_addr(eth->h_dest)) {
	113	macvlan_broadcast(skb, port);
	114	return skb;
	115	}
	116
	117	vlan = macvlan_hash_lookup(port, eth->h_dest);
	118	if (vlan == NULL)
	119	return skb;
	120
	121	dev = vlan->dev;
	122	if (unlikely(!(dev->flags & IFF_UP))) {
	123	kfree_skb(skb);
	124	return NULL;
	125	}
	126
	127	skb = skb_share_check(skb, GFP_ATOMIC);
	128	if (skb == NULL) {
	129	dev->stats.rx_errors++;
	130	dev->stats.rx_dropped++;
	131	return NULL;
	132	}
	133
	134	dev->stats.rx_bytes += skb->len + ETH_HLEN;
	135	dev->stats.rx_packets++;
	136	dev->last_rx = jiffies;
	137
	138	skb->dev = dev;
	139	skb->pkt_type = PACKET_HOST;
140
141	netif_rx(skb);
142	return NULL;
143	}
144
145	static int macvlan_hard_start_xmit(struct sk_buff skb, struct net_device dev)
146	{
147	const struct macvlan_dev *vlan = netdev_priv(dev);
148	unsigned int len = skb->len;
149	int ret;
150
151	skb->dev = vlan->lowerdev;
152	ret = dev_queue_xmit(skb);
153
154	if (likely(ret == NET_XMIT_SUCCESS)) {
155	dev->stats.tx_packets++;
156	dev->stats.tx_bytes += len;
157	} else {
158	dev->stats.tx_errors++;
159	dev->stats.tx_aborted_errors++;
160	}
161	return NETDEV_TX_OK;
162	}
163
164	static int macvlan_hard_header(struct sk_buff skb, struct net_device dev,
3b04ddde SH	165	unsigned short type, const void *daddr,
3b04ddde SH	166	const void *saddr, unsigned len)
b863ceb7 PM	167	{
	168	const struct macvlan_dev *vlan = netdev_priv(dev);
	169	struct net_device *lowerdev = vlan->lowerdev;
	170
0c4e8581 SH	171	return dev_hard_header(skb, lowerdev, type, daddr,
0c4e8581 SH	172	saddr ? : dev->dev_addr, len);
b863ceb7 PM	173	}
b863ceb7 PM	174
3b04ddde SH	175	static const struct header_ops macvlan_hard_header_ops = {
	176	.create = macvlan_hard_header,
	177	.rebuild = eth_rebuild_header,
	178	.parse = eth_header_parse,
3b04ddde SH	179	.cache = eth_header_cache,
	180	.cache_update = eth_header_cache_update,
	181	};
	182
b863ceb7 PM	183	static int macvlan_open(struct net_device *dev)
	184	{
	185	struct macvlan_dev *vlan = netdev_priv(dev);
	186	struct macvlan_port *port = vlan->port;
	187	struct net_device *lowerdev = vlan->lowerdev;
	188	int err;
	189
	190	err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN);
	191	if (err < 0)
b89fb7da WC	192	goto out;
	193	if (dev->flags & IFF_ALLMULTI) {
	194	err = dev_set_allmulti(lowerdev, 1);
	195	if (err < 0)
	196	goto del_unicast;
	197	}
b863ceb7 PM	198
	199	hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]);
	200	return 0;
b89fb7da WC	201
	202	del_unicast:
	203	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
	204	out:
	205	return err;
b863ceb7 PM	206	}
	207
	208	static int macvlan_stop(struct net_device *dev)
	209	{
	210	struct macvlan_dev *vlan = netdev_priv(dev);
	211	struct net_device *lowerdev = vlan->lowerdev;
	212
	213	dev_mc_unsync(lowerdev, dev);
	214	if (dev->flags & IFF_ALLMULTI)
	215	dev_set_allmulti(lowerdev, -1);
	216
	217	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
	218
	219	hlist_del_rcu(&vlan->hlist);
	220	synchronize_rcu();
	221	return 0;
	222	}
	223
ad5d20a6 PM	224	static int macvlan_set_mac_address(struct net_device dev, void p)
	225	{
	226	struct macvlan_dev *vlan = netdev_priv(dev);
	227	struct net_device *lowerdev = vlan->lowerdev;
	228	struct sockaddr *addr = p;
	229	int err;
	230
	231	if (!is_valid_ether_addr(addr->sa_data))
	232	return -EADDRNOTAVAIL;
	233
	234	if (!(dev->flags & IFF_UP))
	235	goto out;
	236
	237	err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN);
	238	if (err < 0)
	239	return err;
	240	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
	241
	242	out:
	243	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
	244	return 0;
	245	}
	246
b863ceb7 PM	247	static void macvlan_change_rx_flags(struct net_device *dev, int change)
	248	{
	249	struct macvlan_dev *vlan = netdev_priv(dev);
	250	struct net_device *lowerdev = vlan->lowerdev;
	251
	252	if (change & IFF_ALLMULTI)
	253	dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
	254	}
	255
	256	static void macvlan_set_multicast_list(struct net_device *dev)
	257	{
	258	struct macvlan_dev *vlan = netdev_priv(dev);
	259
	260	dev_mc_sync(vlan->lowerdev, dev);
	261	}
	262
	263	static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
	264	{
	265	struct macvlan_dev *vlan = netdev_priv(dev);
	266
	267	if (new_mtu < 68 \|\| vlan->lowerdev->mtu < new_mtu)
	268	return -EINVAL;
	269	dev->mtu = new_mtu;
	270	return 0;
	271	}
	272
	273	/*
	274	* macvlan network devices have devices nesting below it and are a special
	275	* "super class" of normal network devices; split their locks off into a
	276	* separate class since they always nest.
	277	*/
	278	static struct lock_class_key macvlan_netdev_xmit_lock_key;
	279
	280	#define MACVLAN_FEATURES \
	281	(NETIF_F_SG \| NETIF_F_ALL_CSUM \| NETIF_F_HIGHDMA \| NETIF_F_FRAGLIST \| \
	282	NETIF_F_GSO \| NETIF_F_TSO \| NETIF_F_UFO \| NETIF_F_GSO_ROBUST \| \
	283	NETIF_F_TSO_ECN \| NETIF_F_TSO6)
	284
	285	#define MACVLAN_STATE_MASK \
	286	((1<<__LINK_STATE_NOCARRIER) \| (1<<__LINK_STATE_DORMANT))
	287
e8a0464c DM	288	static void macvlan_set_lockdep_class_one(struct net_device *dev,
	289	struct netdev_queue *txq,
	290	void *_unused)
c773e847 DM	291	{
	292	lockdep_set_class(&txq->_xmit_lock,
	293	&macvlan_netdev_xmit_lock_key);
	294	}
	295
	296	static void macvlan_set_lockdep_class(struct net_device *dev)
	297	{
e8a0464c	298	netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
c773e847 DM	299	}
c773e847 DM	300
b863ceb7 PM	301	static int macvlan_init(struct net_device *dev)
	302	{
	303	struct macvlan_dev *vlan = netdev_priv(dev);
	304	const struct net_device *lowerdev = vlan->lowerdev;
	305
	306	dev->state = (dev->state & ~MACVLAN_STATE_MASK) \|
	307	(lowerdev->state & MACVLAN_STATE_MASK);
	308	dev->features = lowerdev->features & MACVLAN_FEATURES;
	309	dev->iflink = lowerdev->ifindex;
	310
c773e847 DM	311	macvlan_set_lockdep_class(dev);
c773e847 DM	312
b863ceb7 PM	313	return 0;
	314	}
	315
	316	static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
	317	struct ethtool_drvinfo *drvinfo)
	318	{
	319	snprintf(drvinfo->driver, 32, "macvlan");
	320	snprintf(drvinfo->version, 32, "0.1");
	321	}
	322
	323	static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
	324	{
	325	const struct macvlan_dev *vlan = netdev_priv(dev);
	326	struct net_device *lowerdev = vlan->lowerdev;
	327
	328	if (lowerdev->ethtool_ops->get_rx_csum == NULL)
	329	return 0;
	330	return lowerdev->ethtool_ops->get_rx_csum(lowerdev);
	331	}
	332
	333	static const struct ethtool_ops macvlan_ethtool_ops = {
	334	.get_link = ethtool_op_get_link,
	335	.get_rx_csum = macvlan_ethtool_get_rx_csum,
b863ceb7 PM	336	.get_drvinfo = macvlan_ethtool_get_drvinfo,
	337	};
	338
	339	static void macvlan_setup(struct net_device *dev)
	340	{
	341	ether_setup(dev);
	342
	343	dev->init = macvlan_init;
	344	dev->open = macvlan_open;
	345	dev->stop = macvlan_stop;
	346	dev->change_mtu = macvlan_change_mtu;
	347	dev->change_rx_flags = macvlan_change_rx_flags;
ad5d20a6	348	dev->set_mac_address = macvlan_set_mac_address;
b863ceb7	349	dev->set_multicast_list = macvlan_set_multicast_list;
b863ceb7 PM	350	dev->hard_start_xmit = macvlan_hard_start_xmit;
b863ceb7 PM	351	dev->destructor = free_netdev;
3b04ddde	352	dev->header_ops = &macvlan_hard_header_ops,
b863ceb7 PM	353	dev->ethtool_ops = &macvlan_ethtool_ops;
	354	dev->tx_queue_len = 0;
	355	}
	356
	357	static int macvlan_port_create(struct net_device *dev)
	358	{
	359	struct macvlan_port *port;
	360	unsigned int i;
	361
	362	if (dev->type != ARPHRD_ETHER \|\| dev->flags & IFF_LOOPBACK)
	363	return -EINVAL;
	364
	365	port = kzalloc(sizeof(*port), GFP_KERNEL);
	366	if (port == NULL)
	367	return -ENOMEM;
	368
	369	port->dev = dev;
	370	INIT_LIST_HEAD(&port->vlans);
	371	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
	372	INIT_HLIST_HEAD(&port->vlan_hash[i]);
	373	rcu_assign_pointer(dev->macvlan_port, port);
	374	return 0;
	375	}
	376
	377	static void macvlan_port_destroy(struct net_device *dev)
	378	{
	379	struct macvlan_port *port = dev->macvlan_port;
	380
	381	rcu_assign_pointer(dev->macvlan_port, NULL);
	382	synchronize_rcu();
	383	kfree(port);
	384	}
	385
	386	static void macvlan_transfer_operstate(struct net_device *dev)
	387	{
	388	struct macvlan_dev *vlan = netdev_priv(dev);
	389	const struct net_device *lowerdev = vlan->lowerdev;
	390
	391	if (lowerdev->operstate == IF_OPER_DORMANT)
	392	netif_dormant_on(dev);
	393	else
	394	netif_dormant_off(dev);
	395
	396	if (netif_carrier_ok(lowerdev)) {
	397	if (!netif_carrier_ok(dev))
	398	netif_carrier_on(dev);
	399	} else {
f12ca5f9	400	if (netif_carrier_ok(dev))
b863ceb7 PM	401	netif_carrier_off(dev);
	402	}
	403	}
	404
	405	static int macvlan_validate(struct nlattr tb[], struct nlattr data[])
	406	{
	407	if (tb[IFLA_ADDRESS]) {
	408	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	409	return -EINVAL;
	410	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	411	return -EADDRNOTAVAIL;
	412	}
	413	return 0;
	414	}
	415
	416	static int macvlan_newlink(struct net_device *dev,
	417	struct nlattr tb[], struct nlattr data[])
	418	{
	419	struct macvlan_dev *vlan = netdev_priv(dev);
	420	struct macvlan_port *port;
	421	struct net_device *lowerdev;
	422	int err;
	423
	424	if (!tb[IFLA_LINK])
	425	return -EINVAL;
	426
c346dca1	427	lowerdev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
b863ceb7 PM	428	if (lowerdev == NULL)
	429	return -ENODEV;
	430
a6ca5f1d PM	431	/* Don't allow macvlans on top of other macvlans - its not really
	432	* wrong, but lockdep can't handle it and its not useful for anything
	433	* you couldn't do directly on top of the real device.
	434	*/
	435	if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops)
	436	return -ENODEV;
	437
b863ceb7 PM	438	if (!tb[IFLA_MTU])
	439	dev->mtu = lowerdev->mtu;
	440	else if (dev->mtu > lowerdev->mtu)
	441	return -EINVAL;
	442
	443	if (!tb[IFLA_ADDRESS])
	444	random_ether_addr(dev->dev_addr);
	445
	446	if (lowerdev->macvlan_port == NULL) {
	447	err = macvlan_port_create(lowerdev);
	448	if (err < 0)
	449	return err;
	450	}
	451	port = lowerdev->macvlan_port;
	452
	453	vlan->lowerdev = lowerdev;
	454	vlan->dev = dev;
	455	vlan->port = port;
	456
	457	err = register_netdevice(dev);
	458	if (err < 0)
	459	return err;
	460
	461	list_add_tail(&vlan->list, &port->vlans);
	462	macvlan_transfer_operstate(dev);
	463	return 0;
	464	}
	465
	466	static void macvlan_dellink(struct net_device *dev)
	467	{
	468	struct macvlan_dev *vlan = netdev_priv(dev);
	469	struct macvlan_port *port = vlan->port;
	470
	471	list_del(&vlan->list);
	472	unregister_netdevice(dev);
	473
	474	if (list_empty(&port->vlans))
73120964	475	macvlan_port_destroy(port->dev);
b863ceb7 PM	476	}
	477
	478	static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
	479	.kind = "macvlan",
	480	.priv_size = sizeof(struct macvlan_dev),
	481	.setup = macvlan_setup,
	482	.validate = macvlan_validate,
	483	.newlink = macvlan_newlink,
	484	.dellink = macvlan_dellink,
	485	};
	486
	487	static int macvlan_device_event(struct notifier_block *unused,
	488	unsigned long event, void *ptr)
	489	{
	490	struct net_device *dev = ptr;
	491	struct macvlan_dev vlan, next;
	492	struct macvlan_port *port;
	493
	494	port = dev->macvlan_port;
	495	if (port == NULL)
	496	return NOTIFY_DONE;
	497
	498	switch (event) {
	499	case NETDEV_CHANGE:
	500	list_for_each_entry(vlan, &port->vlans, list)
	501	macvlan_transfer_operstate(vlan->dev);
	502	break;
	503	case NETDEV_FEAT_CHANGE:
	504	list_for_each_entry(vlan, &port->vlans, list) {
	505	vlan->dev->features = dev->features & MACVLAN_FEATURES;
	506	netdev_features_change(vlan->dev);
	507	}
	508	break;
	509	case NETDEV_UNREGISTER:
	510	list_for_each_entry_safe(vlan, next, &port->vlans, list)
	511	macvlan_dellink(vlan->dev);
	512	break;
	513	}
	514	return NOTIFY_DONE;
	515	}
	516
	517	static struct notifier_block macvlan_notifier_block __read_mostly = {
	518	.notifier_call = macvlan_device_event,
	519	};
	520
	521	static int __init macvlan_init_module(void)
	522	{
	523	int err;
	524
	525	register_netdevice_notifier(&macvlan_notifier_block);
	526	macvlan_handle_frame_hook = macvlan_handle_frame;
	527
	528	err = rtnl_link_register(&macvlan_link_ops);
	529	if (err < 0)
	530	goto err1;
	531	return 0;
	532	err1:
52913246	533	macvlan_handle_frame_hook = NULL;
b863ceb7 PM	534	unregister_netdevice_notifier(&macvlan_notifier_block);
	535	return err;
	536	}
	537
	538	static void __exit macvlan_cleanup_module(void)
	539	{
	540	rtnl_link_unregister(&macvlan_link_ops);
	541	macvlan_handle_frame_hook = NULL;
	542	unregister_netdevice_notifier(&macvlan_notifier_block);
	543	}
	544
	545	module_init(macvlan_init_module);
	546	module_exit(macvlan_cleanup_module);
	547
	548	MODULE_LICENSE("GPL");
	549	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	550	MODULE_DESCRIPTION("Driver for MAC address based VLANs");
	551	MODULE_ALIAS_RTNL_LINK("macvlan");