[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/rculist.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;

	if (skb->protocol == htons(ETH_P_PAUSE))
		return;

	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++;

			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++;

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

	netif_rx(skb);
	return NULL;
}

static int macvlan_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;
static struct lock_class_key macvlan_netdev_addr_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)
{
	lockdep_set_class(&dev->addr_list_lock,
			  &macvlan_netdev_addr_lock_key);
	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 int macvlan_ethtool_get_settings(struct net_device *dev,
					struct ethtool_cmd *cmd)
{
	const struct macvlan_dev *vlan = netdev_priv(dev);
	struct net_device *lowerdev = vlan->lowerdev;

	if (!lowerdev->ethtool_ops->get_settings)
		return -EOPNOTSUPP;

	return lowerdev->ethtool_ops->get_settings(lowerdev, cmd);
}

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

	if (!lowerdev->ethtool_ops->get_flags)
		return 0;
	return lowerdev->ethtool_ops->get_flags(lowerdev);
}

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

static const struct net_device_ops macvlan_netdev_ops = {
	.ndo_init		= macvlan_init,
	.ndo_open		= macvlan_open,
	.ndo_stop		= macvlan_stop,
	.ndo_start_xmit		= macvlan_start_xmit,
	.ndo_change_mtu		= macvlan_change_mtu,
	.ndo_change_rx_flags	= macvlan_change_rx_flags,
	.ndo_set_mac_address	= macvlan_set_mac_address,
	.ndo_set_multicast_list	= macvlan_set_multicast_list,
	.ndo_validate_addr	= eth_validate_addr,
};

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

	dev->netdev_ops		= &macvlan_netdev_ops;
	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;

	/* When creating macvlans on top of other macvlans - use
	 * the real device as the lowerdev.
	 */
	if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
		struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
		lowerdev = lowervlan->lowerdev;
	}

	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>
82524746	23	#include <linux/rculist.h>
b863ceb7 PM	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
efbbced3 PM	73	if (skb->protocol == htons(ETH_P_PAUSE))
	74	return;
	75
b863ceb7 PM	76	for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
	77	hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
	78	dev = vlan->dev;
b863ceb7 PM	79
	80	nskb = skb_clone(skb, GFP_ATOMIC);
	81	if (nskb == NULL) {
	82	dev->stats.rx_errors++;
	83	dev->stats.rx_dropped++;
	84	continue;
	85	}
	86
	87	dev->stats.rx_bytes += skb->len + ETH_HLEN;
	88	dev->stats.rx_packets++;
	89	dev->stats.multicast++;
b863ceb7 PM	90
	91	nskb->dev = dev;
	92	if (!compare_ether_addr(eth->h_dest, dev->broadcast))
	93	nskb->pkt_type = PACKET_BROADCAST;
	94	else
	95	nskb->pkt_type = PACKET_MULTICAST;
	96
	97	netif_rx(nskb);
	98	}
	99	}
	100	}
	101
	102	/* called under rcu_read_lock() from netif_receive_skb */
	103	static struct sk_buff macvlan_handle_frame(struct sk_buff skb)
	104	{
	105	const struct ethhdr *eth = eth_hdr(skb);
	106	const struct macvlan_port *port;
	107	const struct macvlan_dev *vlan;
	108	struct net_device *dev;
	109
	110	port = rcu_dereference(skb->dev->macvlan_port);
	111	if (port == NULL)
	112	return skb;
	113
	114	if (is_multicast_ether_addr(eth->h_dest)) {
	115	macvlan_broadcast(skb, port);
	116	return skb;
	117	}
	118
	119	vlan = macvlan_hash_lookup(port, eth->h_dest);
	120	if (vlan == NULL)
	121	return skb;
	122
	123	dev = vlan->dev;
	124	if (unlikely(!(dev->flags & IFF_UP))) {
	125	kfree_skb(skb);
	126	return NULL;
	127	}
	128
	129	skb = skb_share_check(skb, GFP_ATOMIC);
	130	if (skb == NULL) {
	131	dev->stats.rx_errors++;
	132	dev->stats.rx_dropped++;
	133	return NULL;
	134	}
	135
	136	dev->stats.rx_bytes += skb->len + ETH_HLEN;
	137	dev->stats.rx_packets++;
b863ceb7 PM	138
	139	skb->dev = dev;
	140	skb->pkt_type = PACKET_HOST;
	141
	142	netif_rx(skb);
	143	return NULL;
	144	}
	145
00829823	146	static int macvlan_start_xmit(struct sk_buff skb, struct net_device dev)
b863ceb7 PM	147	{
	148	const struct macvlan_dev *vlan = netdev_priv(dev);
	149	unsigned int len = skb->len;
	150	int ret;
	151
	152	skb->dev = vlan->lowerdev;
	153	ret = dev_queue_xmit(skb);
	154
	155	if (likely(ret == NET_XMIT_SUCCESS)) {
	156	dev->stats.tx_packets++;
	157	dev->stats.tx_bytes += len;
	158	} else {
	159	dev->stats.tx_errors++;
	160	dev->stats.tx_aborted_errors++;
	161	}
	162	return NETDEV_TX_OK;
	163	}
	164
	165	static int macvlan_hard_header(struct sk_buff skb, struct net_device dev,
3b04ddde SH	166	unsigned short type, const void *daddr,
3b04ddde SH	167	const void *saddr, unsigned len)
b863ceb7 PM	168	{
	169	const struct macvlan_dev *vlan = netdev_priv(dev);
	170	struct net_device *lowerdev = vlan->lowerdev;
	171
0c4e8581 SH	172	return dev_hard_header(skb, lowerdev, type, daddr,
0c4e8581 SH	173	saddr ? : dev->dev_addr, len);
b863ceb7 PM	174	}
b863ceb7 PM	175
3b04ddde SH	176	static const struct header_ops macvlan_hard_header_ops = {
	177	.create = macvlan_hard_header,
	178	.rebuild = eth_rebuild_header,
	179	.parse = eth_header_parse,
3b04ddde SH	180	.cache = eth_header_cache,
	181	.cache_update = eth_header_cache_update,
	182	};
	183
b863ceb7 PM	184	static int macvlan_open(struct net_device *dev)
	185	{
	186	struct macvlan_dev *vlan = netdev_priv(dev);
	187	struct macvlan_port *port = vlan->port;
	188	struct net_device *lowerdev = vlan->lowerdev;
	189	int err;
	190
	191	err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN);
	192	if (err < 0)
b89fb7da WC	193	goto out;
	194	if (dev->flags & IFF_ALLMULTI) {
	195	err = dev_set_allmulti(lowerdev, 1);
	196	if (err < 0)
	197	goto del_unicast;
	198	}
b863ceb7 PM	199
	200	hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]);
	201	return 0;
b89fb7da WC	202
	203	del_unicast:
	204	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
	205	out:
	206	return err;
b863ceb7 PM	207	}
	208
	209	static int macvlan_stop(struct net_device *dev)
	210	{
	211	struct macvlan_dev *vlan = netdev_priv(dev);
	212	struct net_device *lowerdev = vlan->lowerdev;
	213
	214	dev_mc_unsync(lowerdev, dev);
	215	if (dev->flags & IFF_ALLMULTI)
	216	dev_set_allmulti(lowerdev, -1);
	217
	218	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
	219
	220	hlist_del_rcu(&vlan->hlist);
	221	synchronize_rcu();
	222	return 0;
	223	}
	224
ad5d20a6 PM	225	static int macvlan_set_mac_address(struct net_device dev, void p)
	226	{
	227	struct macvlan_dev *vlan = netdev_priv(dev);
	228	struct net_device *lowerdev = vlan->lowerdev;
	229	struct sockaddr *addr = p;
	230	int err;
	231
	232	if (!is_valid_ether_addr(addr->sa_data))
	233	return -EADDRNOTAVAIL;
	234
	235	if (!(dev->flags & IFF_UP))
	236	goto out;
	237
	238	err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN);
	239	if (err < 0)
	240	return err;
	241	dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
	242
	243	out:
	244	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
	245	return 0;
	246	}
	247
b863ceb7 PM	248	static void macvlan_change_rx_flags(struct net_device *dev, int change)
	249	{
	250	struct macvlan_dev *vlan = netdev_priv(dev);
	251	struct net_device *lowerdev = vlan->lowerdev;
	252
	253	if (change & IFF_ALLMULTI)
	254	dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
	255	}
	256
	257	static void macvlan_set_multicast_list(struct net_device *dev)
	258	{
	259	struct macvlan_dev *vlan = netdev_priv(dev);
	260
	261	dev_mc_sync(vlan->lowerdev, dev);
	262	}
	263
	264	static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
	265	{
	266	struct macvlan_dev *vlan = netdev_priv(dev);
	267
	268	if (new_mtu < 68 \|\| vlan->lowerdev->mtu < new_mtu)
	269	return -EINVAL;
	270	dev->mtu = new_mtu;
	271	return 0;
	272	}
	273
	274	/*
	275	* macvlan network devices have devices nesting below it and are a special
	276	* "super class" of normal network devices; split their locks off into a
	277	* separate class since they always nest.
	278	*/
	279	static struct lock_class_key macvlan_netdev_xmit_lock_key;
cf508b12	280	static struct lock_class_key macvlan_netdev_addr_lock_key;
b863ceb7 PM	281
	282	#define MACVLAN_FEATURES \
	283	(NETIF_F_SG \| NETIF_F_ALL_CSUM \| NETIF_F_HIGHDMA \| NETIF_F_FRAGLIST \| \
	284	NETIF_F_GSO \| NETIF_F_TSO \| NETIF_F_UFO \| NETIF_F_GSO_ROBUST \| \
	285	NETIF_F_TSO_ECN \| NETIF_F_TSO6)
	286
	287	#define MACVLAN_STATE_MASK \
	288	((1<<__LINK_STATE_NOCARRIER) \| (1<<__LINK_STATE_DORMANT))
	289
e8a0464c DM	290	static void macvlan_set_lockdep_class_one(struct net_device *dev,
	291	struct netdev_queue *txq,
	292	void *_unused)
c773e847 DM	293	{
	294	lockdep_set_class(&txq->_xmit_lock,
	295	&macvlan_netdev_xmit_lock_key);
	296	}
	297
	298	static void macvlan_set_lockdep_class(struct net_device *dev)
	299	{
cf508b12 DM	300	lockdep_set_class(&dev->addr_list_lock,
cf508b12 DM	301	&macvlan_netdev_addr_lock_key);
e8a0464c	302	netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
c773e847 DM	303	}
c773e847 DM	304
b863ceb7 PM	305	static int macvlan_init(struct net_device *dev)
	306	{
	307	struct macvlan_dev *vlan = netdev_priv(dev);
	308	const struct net_device *lowerdev = vlan->lowerdev;
	309
	310	dev->state = (dev->state & ~MACVLAN_STATE_MASK) \|
	311	(lowerdev->state & MACVLAN_STATE_MASK);
	312	dev->features = lowerdev->features & MACVLAN_FEATURES;
	313	dev->iflink = lowerdev->ifindex;
	314
c773e847 DM	315	macvlan_set_lockdep_class(dev);
c773e847 DM	316
b863ceb7 PM	317	return 0;
	318	}
	319
	320	static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
	321	struct ethtool_drvinfo *drvinfo)
	322	{
	323	snprintf(drvinfo->driver, 32, "macvlan");
	324	snprintf(drvinfo->version, 32, "0.1");
	325	}
	326
	327	static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
	328	{
	329	const struct macvlan_dev *vlan = netdev_priv(dev);
	330	struct net_device *lowerdev = vlan->lowerdev;
	331
	332	if (lowerdev->ethtool_ops->get_rx_csum == NULL)
	333	return 0;
	334	return lowerdev->ethtool_ops->get_rx_csum(lowerdev);
	335	}
	336
9edb8bb6 SH	337	static int macvlan_ethtool_get_settings(struct net_device *dev,
	338	struct ethtool_cmd *cmd)
	339	{
	340	const struct macvlan_dev *vlan = netdev_priv(dev);
	341	struct net_device *lowerdev = vlan->lowerdev;
	342
	343	if (!lowerdev->ethtool_ops->get_settings)
	344	return -EOPNOTSUPP;
	345
	346	return lowerdev->ethtool_ops->get_settings(lowerdev, cmd);
	347	}
	348
	349	static u32 macvlan_ethtool_get_flags(struct net_device *dev)
	350	{
	351	const struct macvlan_dev *vlan = netdev_priv(dev);
	352	struct net_device *lowerdev = vlan->lowerdev;
	353
	354	if (!lowerdev->ethtool_ops->get_flags)
	355	return 0;
	356	return lowerdev->ethtool_ops->get_flags(lowerdev);
	357	}
	358
b863ceb7 PM	359	static const struct ethtool_ops macvlan_ethtool_ops = {
b863ceb7 PM	360	.get_link = ethtool_op_get_link,
9edb8bb6	361	.get_settings = macvlan_ethtool_get_settings,
b863ceb7	362	.get_rx_csum = macvlan_ethtool_get_rx_csum,
b863ceb7	363	.get_drvinfo = macvlan_ethtool_get_drvinfo,
9edb8bb6	364	.get_flags = macvlan_ethtool_get_flags,
b863ceb7 PM	365	};
b863ceb7 PM	366
54a30c97 SH	367	static const struct net_device_ops macvlan_netdev_ops = {
	368	.ndo_init = macvlan_init,
	369	.ndo_open = macvlan_open,
	370	.ndo_stop = macvlan_stop,
00829823	371	.ndo_start_xmit = macvlan_start_xmit,
54a30c97 SH	372	.ndo_change_mtu = macvlan_change_mtu,
	373	.ndo_change_rx_flags = macvlan_change_rx_flags,
	374	.ndo_set_mac_address = macvlan_set_mac_address,
	375	.ndo_set_multicast_list = macvlan_set_multicast_list,
	376	.ndo_validate_addr = eth_validate_addr,
	377	};
	378
b863ceb7 PM	379	static void macvlan_setup(struct net_device *dev)
	380	{
	381	ether_setup(dev);
	382
54a30c97	383	dev->netdev_ops = &macvlan_netdev_ops;
b863ceb7	384	dev->destructor = free_netdev;
3b04ddde	385	dev->header_ops = &macvlan_hard_header_ops,
b863ceb7 PM	386	dev->ethtool_ops = &macvlan_ethtool_ops;
	387	dev->tx_queue_len = 0;
	388	}
	389
	390	static int macvlan_port_create(struct net_device *dev)
	391	{
	392	struct macvlan_port *port;
	393	unsigned int i;
	394
	395	if (dev->type != ARPHRD_ETHER \|\| dev->flags & IFF_LOOPBACK)
	396	return -EINVAL;
	397
	398	port = kzalloc(sizeof(*port), GFP_KERNEL);
	399	if (port == NULL)
	400	return -ENOMEM;
	401
	402	port->dev = dev;
	403	INIT_LIST_HEAD(&port->vlans);
	404	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
	405	INIT_HLIST_HEAD(&port->vlan_hash[i]);
	406	rcu_assign_pointer(dev->macvlan_port, port);
	407	return 0;
	408	}
	409
	410	static void macvlan_port_destroy(struct net_device *dev)
	411	{
	412	struct macvlan_port *port = dev->macvlan_port;
	413
	414	rcu_assign_pointer(dev->macvlan_port, NULL);
	415	synchronize_rcu();
	416	kfree(port);
	417	}
	418
	419	static void macvlan_transfer_operstate(struct net_device *dev)
	420	{
	421	struct macvlan_dev *vlan = netdev_priv(dev);
	422	const struct net_device *lowerdev = vlan->lowerdev;
	423
	424	if (lowerdev->operstate == IF_OPER_DORMANT)
	425	netif_dormant_on(dev);
	426	else
	427	netif_dormant_off(dev);
	428
	429	if (netif_carrier_ok(lowerdev)) {
	430	if (!netif_carrier_ok(dev))
	431	netif_carrier_on(dev);
	432	} else {
f12ca5f9	433	if (netif_carrier_ok(dev))
b863ceb7 PM	434	netif_carrier_off(dev);
	435	}
	436	}
	437
	438	static int macvlan_validate(struct nlattr tb[], struct nlattr data[])
	439	{
	440	if (tb[IFLA_ADDRESS]) {
	441	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	442	return -EINVAL;
	443	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	444	return -EADDRNOTAVAIL;
	445	}
	446	return 0;
	447	}
	448
	449	static int macvlan_newlink(struct net_device *dev,
	450	struct nlattr tb[], struct nlattr data[])
	451	{
	452	struct macvlan_dev *vlan = netdev_priv(dev);
	453	struct macvlan_port *port;
	454	struct net_device *lowerdev;
	455	int err;
	456
	457	if (!tb[IFLA_LINK])
	458	return -EINVAL;
	459
c346dca1	460	lowerdev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
b863ceb7 PM	461	if (lowerdev == NULL)
	462	return -ENODEV;
	463
b0832a29 EB	464	/* When creating macvlans on top of other macvlans - use
b0832a29 EB	465	* the real device as the lowerdev.
a6ca5f1d	466	*/
b0832a29 EB	467	if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
	468	struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
	469	lowerdev = lowervlan->lowerdev;
	470	}
a6ca5f1d	471
b863ceb7 PM	472	if (!tb[IFLA_MTU])
	473	dev->mtu = lowerdev->mtu;
	474	else if (dev->mtu > lowerdev->mtu)
	475	return -EINVAL;
	476
	477	if (!tb[IFLA_ADDRESS])
	478	random_ether_addr(dev->dev_addr);
	479
	480	if (lowerdev->macvlan_port == NULL) {
	481	err = macvlan_port_create(lowerdev);
	482	if (err < 0)
	483	return err;
	484	}
	485	port = lowerdev->macvlan_port;
	486
	487	vlan->lowerdev = lowerdev;
	488	vlan->dev = dev;
	489	vlan->port = port;
	490
	491	err = register_netdevice(dev);
	492	if (err < 0)
	493	return err;
	494
	495	list_add_tail(&vlan->list, &port->vlans);
	496	macvlan_transfer_operstate(dev);
	497	return 0;
	498	}
	499
	500	static void macvlan_dellink(struct net_device *dev)
	501	{
	502	struct macvlan_dev *vlan = netdev_priv(dev);
	503	struct macvlan_port *port = vlan->port;
	504
	505	list_del(&vlan->list);
	506	unregister_netdevice(dev);
	507
	508	if (list_empty(&port->vlans))
73120964	509	macvlan_port_destroy(port->dev);
b863ceb7 PM	510	}
	511
	512	static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
	513	.kind = "macvlan",
	514	.priv_size = sizeof(struct macvlan_dev),
	515	.setup = macvlan_setup,
	516	.validate = macvlan_validate,
	517	.newlink = macvlan_newlink,
	518	.dellink = macvlan_dellink,
	519	};
	520
	521	static int macvlan_device_event(struct notifier_block *unused,
	522	unsigned long event, void *ptr)
	523	{
	524	struct net_device *dev = ptr;
	525	struct macvlan_dev vlan, next;
	526	struct macvlan_port *port;
	527
	528	port = dev->macvlan_port;
	529	if (port == NULL)
	530	return NOTIFY_DONE;
	531
	532	switch (event) {
	533	case NETDEV_CHANGE:
	534	list_for_each_entry(vlan, &port->vlans, list)
	535	macvlan_transfer_operstate(vlan->dev);
	536	break;
	537	case NETDEV_FEAT_CHANGE:
	538	list_for_each_entry(vlan, &port->vlans, list) {
	539	vlan->dev->features = dev->features & MACVLAN_FEATURES;
	540	netdev_features_change(vlan->dev);
	541	}
	542	break;
	543	case NETDEV_UNREGISTER:
	544	list_for_each_entry_safe(vlan, next, &port->vlans, list)
	545	macvlan_dellink(vlan->dev);
	546	break;
	547	}
	548	return NOTIFY_DONE;
	549	}
	550
	551	static struct notifier_block macvlan_notifier_block __read_mostly = {
	552	.notifier_call = macvlan_device_event,
	553	};
	554
	555	static int __init macvlan_init_module(void)
	556	{
	557	int err;
	558
	559	register_netdevice_notifier(&macvlan_notifier_block);
	560	macvlan_handle_frame_hook = macvlan_handle_frame;
	561
	562	err = rtnl_link_register(&macvlan_link_ops);
	563	if (err < 0)
	564	goto err1;
	565	return 0;
	566	err1:
52913246	567	macvlan_handle_frame_hook = NULL;
b863ceb7 PM	568	unregister_netdevice_notifier(&macvlan_notifier_block);
	569	return err;
	570	}
	571
	572	static void __exit macvlan_cleanup_module(void)
	573	{
	574	rtnl_link_unregister(&macvlan_link_ops);
	575	macvlan_handle_frame_hook = NULL;
	576	unregister_netdevice_notifier(&macvlan_notifier_block);
	577	}
	578
	579	module_init(macvlan_init_module);
	580	module_exit(macvlan_cleanup_module);
	581
	582	MODULE_LICENSE("GPL");
	583	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	584	MODULE_DESCRIPTION("Driver for MAC address based VLANs");
	585	MODULE_ALIAS_RTNL_LINK("macvlan");