[linux.git] / drivers / net / macvlan.c

/*
 * Copyright (c) 2007 Patrick McHardy <[email protected]>
 *
 * 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, [email protected]
 * Re-worked by Ben Greear <[email protected]>
 * ---
 */
#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)
		return err;
	if (dev->flags & IFF_ALLMULTI)
		dev_set_allmulti(lowerdev, 1);

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

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 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;

	lockdep_set_class(&dev->_xmit_lock, &macvlan_netdev_xmit_lock_key);
	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->nd_net, 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(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 <[email protected]>");
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 <[email protected]>
	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, [email protected]
	13	* Re-worked by Ben Greear <[email protected]>
	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)
	192	return err;
	193	if (dev->flags & IFF_ALLMULTI)
	194	dev_set_allmulti(lowerdev, 1);
	195
	196	hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]);
	197	return 0;
	198	}
	199
	200	static int macvlan_stop(struct net_device *dev)
	201	{
	202	struct macvlan_dev *vlan = netdev_priv(dev);
	203	struct net_device *lowerdev = vlan->lowerdev;
	204
	205	dev_mc_unsync(lowerdev, dev);
	206	if (dev->flags & IFF_ALLMULTI)
	207	dev_set_allmulti(lowerdev, -1);
	208
	209	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
	210
	211	hlist_del_rcu(&vlan->hlist);
	212	synchronize_rcu();
	213	return 0;
	214	}
	215
ad5d20a6 PM	216	static int macvlan_set_mac_address(struct net_device dev, void p)
	217	{
	218	struct macvlan_dev *vlan = netdev_priv(dev);
	219	struct net_device *lowerdev = vlan->lowerdev;
	220	struct sockaddr *addr = p;
	221	int err;
	222
	223	if (!is_valid_ether_addr(addr->sa_data))
	224	return -EADDRNOTAVAIL;
	225
	226	if (!(dev->flags & IFF_UP))
	227	goto out;
	228
	229	err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN);
	230	if (err < 0)
	231	return err;
	232	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
	233
	234	out:
	235	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
	236	return 0;
	237	}
	238
b863ceb7 PM	239	static void macvlan_change_rx_flags(struct net_device *dev, int change)
	240	{
	241	struct macvlan_dev *vlan = netdev_priv(dev);
	242	struct net_device *lowerdev = vlan->lowerdev;
	243
	244	if (change & IFF_ALLMULTI)
	245	dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
	246	}
	247
	248	static void macvlan_set_multicast_list(struct net_device *dev)
	249	{
	250	struct macvlan_dev *vlan = netdev_priv(dev);
	251
	252	dev_mc_sync(vlan->lowerdev, dev);
	253	}
	254
	255	static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
	256	{
	257	struct macvlan_dev *vlan = netdev_priv(dev);
	258
	259	if (new_mtu < 68 \|\| vlan->lowerdev->mtu < new_mtu)
	260	return -EINVAL;
	261	dev->mtu = new_mtu;
	262	return 0;
	263	}
	264
	265	/*
	266	* macvlan network devices have devices nesting below it and are a special
	267	* "super class" of normal network devices; split their locks off into a
	268	* separate class since they always nest.
	269	*/
	270	static struct lock_class_key macvlan_netdev_xmit_lock_key;
	271
	272	#define MACVLAN_FEATURES \
	273	(NETIF_F_SG \| NETIF_F_ALL_CSUM \| NETIF_F_HIGHDMA \| NETIF_F_FRAGLIST \| \
	274	NETIF_F_GSO \| NETIF_F_TSO \| NETIF_F_UFO \| NETIF_F_GSO_ROBUST \| \
	275	NETIF_F_TSO_ECN \| NETIF_F_TSO6)
	276
	277	#define MACVLAN_STATE_MASK \
	278	((1<<__LINK_STATE_NOCARRIER) \| (1<<__LINK_STATE_DORMANT))
	279
	280	static int macvlan_init(struct net_device *dev)
	281	{
	282	struct macvlan_dev *vlan = netdev_priv(dev);
	283	const struct net_device *lowerdev = vlan->lowerdev;
	284
	285	dev->state = (dev->state & ~MACVLAN_STATE_MASK) \|
	286	(lowerdev->state & MACVLAN_STATE_MASK);
	287	dev->features = lowerdev->features & MACVLAN_FEATURES;
	288	dev->iflink = lowerdev->ifindex;
	289
	290	lockdep_set_class(&dev->_xmit_lock, &macvlan_netdev_xmit_lock_key);
	291	return 0;
	292	}
	293
	294	static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
	295	struct ethtool_drvinfo *drvinfo)
	296	{
	297	snprintf(drvinfo->driver, 32, "macvlan");
	298	snprintf(drvinfo->version, 32, "0.1");
	299	}
	300
	301	static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
	302	{
303	const struct macvlan_dev *vlan = netdev_priv(dev);
304	struct net_device *lowerdev = vlan->lowerdev;
305
306	if (lowerdev->ethtool_ops->get_rx_csum == NULL)
307	return 0;
308	return lowerdev->ethtool_ops->get_rx_csum(lowerdev);
309	}
310
311	static const struct ethtool_ops macvlan_ethtool_ops = {
312	.get_link = ethtool_op_get_link,
313	.get_rx_csum = macvlan_ethtool_get_rx_csum,
b863ceb7 PM	314	.get_drvinfo = macvlan_ethtool_get_drvinfo,
	315	};
	316
	317	static void macvlan_setup(struct net_device *dev)
	318	{
	319	ether_setup(dev);
	320
	321	dev->init = macvlan_init;
	322	dev->open = macvlan_open;
	323	dev->stop = macvlan_stop;
	324	dev->change_mtu = macvlan_change_mtu;
	325	dev->change_rx_flags = macvlan_change_rx_flags;
ad5d20a6	326	dev->set_mac_address = macvlan_set_mac_address;
b863ceb7	327	dev->set_multicast_list = macvlan_set_multicast_list;
b863ceb7 PM	328	dev->hard_start_xmit = macvlan_hard_start_xmit;
b863ceb7 PM	329	dev->destructor = free_netdev;
3b04ddde	330	dev->header_ops = &macvlan_hard_header_ops,
b863ceb7 PM	331	dev->ethtool_ops = &macvlan_ethtool_ops;
	332	dev->tx_queue_len = 0;
	333	}
	334
	335	static int macvlan_port_create(struct net_device *dev)
	336	{
	337	struct macvlan_port *port;
	338	unsigned int i;
	339
	340	if (dev->type != ARPHRD_ETHER \|\| dev->flags & IFF_LOOPBACK)
	341	return -EINVAL;
	342
	343	port = kzalloc(sizeof(*port), GFP_KERNEL);
	344	if (port == NULL)
	345	return -ENOMEM;
	346
	347	port->dev = dev;
	348	INIT_LIST_HEAD(&port->vlans);
	349	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
	350	INIT_HLIST_HEAD(&port->vlan_hash[i]);
	351	rcu_assign_pointer(dev->macvlan_port, port);
	352	return 0;
	353	}
	354
	355	static void macvlan_port_destroy(struct net_device *dev)
	356	{
	357	struct macvlan_port *port = dev->macvlan_port;
	358
	359	rcu_assign_pointer(dev->macvlan_port, NULL);
	360	synchronize_rcu();
	361	kfree(port);
	362	}
	363
	364	static void macvlan_transfer_operstate(struct net_device *dev)
	365	{
	366	struct macvlan_dev *vlan = netdev_priv(dev);
	367	const struct net_device *lowerdev = vlan->lowerdev;
	368
	369	if (lowerdev->operstate == IF_OPER_DORMANT)
	370	netif_dormant_on(dev);
	371	else
	372	netif_dormant_off(dev);
	373
	374	if (netif_carrier_ok(lowerdev)) {
	375	if (!netif_carrier_ok(dev))
	376	netif_carrier_on(dev);
	377	} else {
f12ca5f9	378	if (netif_carrier_ok(dev))
b863ceb7 PM	379	netif_carrier_off(dev);
	380	}
	381	}
	382
	383	static int macvlan_validate(struct nlattr tb[], struct nlattr data[])
	384	{
	385	if (tb[IFLA_ADDRESS]) {
	386	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	387	return -EINVAL;
	388	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	389	return -EADDRNOTAVAIL;
	390	}
	391	return 0;
	392	}
	393
	394	static int macvlan_newlink(struct net_device *dev,
	395	struct nlattr tb[], struct nlattr data[])
	396	{
	397	struct macvlan_dev *vlan = netdev_priv(dev);
	398	struct macvlan_port *port;
	399	struct net_device *lowerdev;
	400	int err;
	401
	402	if (!tb[IFLA_LINK])
	403	return -EINVAL;
	404
881d966b	405	lowerdev = __dev_get_by_index(dev->nd_net, nla_get_u32(tb[IFLA_LINK]));
b863ceb7 PM	406	if (lowerdev == NULL)
	407	return -ENODEV;
	408
a6ca5f1d PM	409	/* Don't allow macvlans on top of other macvlans - its not really
	410	* wrong, but lockdep can't handle it and its not useful for anything
	411	* you couldn't do directly on top of the real device.
	412	*/
	413	if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops)
	414	return -ENODEV;
	415
b863ceb7 PM	416	if (!tb[IFLA_MTU])
	417	dev->mtu = lowerdev->mtu;
	418	else if (dev->mtu > lowerdev->mtu)
	419	return -EINVAL;
	420
	421	if (!tb[IFLA_ADDRESS])
	422	random_ether_addr(dev->dev_addr);
	423
	424	if (lowerdev->macvlan_port == NULL) {
	425	err = macvlan_port_create(lowerdev);
	426	if (err < 0)
	427	return err;
	428	}
	429	port = lowerdev->macvlan_port;
	430
	431	vlan->lowerdev = lowerdev;
	432	vlan->dev = dev;
	433	vlan->port = port;
	434
	435	err = register_netdevice(dev);
	436	if (err < 0)
	437	return err;
	438
	439	list_add_tail(&vlan->list, &port->vlans);
	440	macvlan_transfer_operstate(dev);
	441	return 0;
	442	}
	443
	444	static void macvlan_dellink(struct net_device *dev)
	445	{
	446	struct macvlan_dev *vlan = netdev_priv(dev);
	447	struct macvlan_port *port = vlan->port;
	448
	449	list_del(&vlan->list);
	450	unregister_netdevice(dev);
	451
	452	if (list_empty(&port->vlans))
	453	macvlan_port_destroy(dev);
	454	}
	455
	456	static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
	457	.kind = "macvlan",
	458	.priv_size = sizeof(struct macvlan_dev),
	459	.setup = macvlan_setup,
	460	.validate = macvlan_validate,
	461	.newlink = macvlan_newlink,
	462	.dellink = macvlan_dellink,
	463	};
	464
	465	static int macvlan_device_event(struct notifier_block *unused,
	466	unsigned long event, void *ptr)
	467	{
	468	struct net_device *dev = ptr;
	469	struct macvlan_dev vlan, next;
	470	struct macvlan_port *port;
	471
	472	port = dev->macvlan_port;
	473	if (port == NULL)
	474	return NOTIFY_DONE;
	475
	476	switch (event) {
	477	case NETDEV_CHANGE:
	478	list_for_each_entry(vlan, &port->vlans, list)
	479	macvlan_transfer_operstate(vlan->dev);
480	break;
481	case NETDEV_FEAT_CHANGE:
482	list_for_each_entry(vlan, &port->vlans, list) {
483	vlan->dev->features = dev->features & MACVLAN_FEATURES;
484	netdev_features_change(vlan->dev);
485	}
486	break;
487	case NETDEV_UNREGISTER:
488	list_for_each_entry_safe(vlan, next, &port->vlans, list)
489	macvlan_dellink(vlan->dev);
490	break;
491	}
492	return NOTIFY_DONE;
493	}
494
495	static struct notifier_block macvlan_notifier_block __read_mostly = {
496	.notifier_call = macvlan_device_event,
497	};
498
499	static int __init macvlan_init_module(void)
500	{
501	int err;
502
503	register_netdevice_notifier(&macvlan_notifier_block);
504	macvlan_handle_frame_hook = macvlan_handle_frame;
505
506	err = rtnl_link_register(&macvlan_link_ops);
507	if (err < 0)
508	goto err1;
509	return 0;
510	err1:
52913246	511	macvlan_handle_frame_hook = NULL;
b863ceb7 PM	512	unregister_netdevice_notifier(&macvlan_notifier_block);
	513	return err;
	514	}
	515
	516	static void __exit macvlan_cleanup_module(void)
	517	{
	518	rtnl_link_unregister(&macvlan_link_ops);
	519	macvlan_handle_frame_hook = NULL;
	520	unregister_netdevice_notifier(&macvlan_notifier_block);
	521	}
	522
	523	module_init(macvlan_init_module);
	524	module_exit(macvlan_cleanup_module);
	525
	526	MODULE_LICENSE("GPL");
	527	MODULE_AUTHOR("Patrick McHardy <[email protected]>");
	528	MODULE_DESCRIPTION("Driver for MAC address based VLANs");
	529	MODULE_ALIAS_RTNL_LINK("macvlan");