[net-next-2.6.git] / net / bridge / br_device.c

/*
 *	Device handling code
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 *
 *	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.
 */

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/netpoll.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/list.h>
#include <linux/netfilter_bridge.h>

#include <asm/uaccess.h>
#include "br_private.h"

/* net device transmit always called with BH disabled */
netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);
	const unsigned char *dest = skb->data;
	struct net_bridge_fdb_entry *dst;
	struct net_bridge_mdb_entry *mdst;
	struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);

#ifdef CONFIG_BRIDGE_NETFILTER
	if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
		br_nf_pre_routing_finish_bridge_slow(skb);
		return NETDEV_TX_OK;
	}
#endif

	brstats->tx_packets++;
	brstats->tx_bytes += skb->len;

	BR_INPUT_SKB_CB(skb)->brdev = dev;

	skb_reset_mac_header(skb);
	skb_pull(skb, ETH_HLEN);

	rcu_read_lock();
	if (is_multicast_ether_addr(dest)) {
		if (br_multicast_rcv(br, NULL, skb)) {
			kfree_skb(skb);
			goto out;
		}

		mdst = br_mdb_get(br, skb);
		if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
			br_multicast_deliver(mdst, skb);
		else
			br_flood_deliver(br, skb);
	} else if ((dst = __br_fdb_get(br, dest)) != NULL)
		br_deliver(dst->dst, skb);
	else
		br_flood_deliver(br, skb);

out:
	rcu_read_unlock();
	return NETDEV_TX_OK;
}

static int br_dev_open(struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);

	br_features_recompute(br);
	netif_start_queue(dev);
	br_stp_enable_bridge(br);
	br_multicast_open(br);

	return 0;
}

static void br_dev_set_multicast_list(struct net_device *dev)
{
}

static int br_dev_stop(struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);

	br_stp_disable_bridge(br);
	br_multicast_stop(br);

	netif_stop_queue(dev);

	return 0;
}

static struct net_device_stats *br_get_stats(struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_device_stats *stats = &dev->stats;
	struct br_cpu_netstats sum = { 0 };
	unsigned int cpu;

	for_each_possible_cpu(cpu) {
		const struct br_cpu_netstats *bstats
			= per_cpu_ptr(br->stats, cpu);

		sum.tx_bytes   += bstats->tx_bytes;
		sum.tx_packets += bstats->tx_packets;
		sum.rx_bytes   += bstats->rx_bytes;
		sum.rx_packets += bstats->rx_packets;
	}

	stats->tx_bytes   = sum.tx_bytes;
	stats->tx_packets = sum.tx_packets;
	stats->rx_bytes   = sum.rx_bytes;
	stats->rx_packets = sum.rx_packets;

	return stats;
}

static int br_change_mtu(struct net_device *dev, int new_mtu)
{
	struct net_bridge *br = netdev_priv(dev);
	if (new_mtu < 68 || new_mtu > br_min_mtu(br))
		return -EINVAL;

	dev->mtu = new_mtu;

#ifdef CONFIG_BRIDGE_NETFILTER
	/* remember the MTU in the rtable for PMTU */
	br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
#endif

	return 0;
}

/* Allow setting mac address to any valid ethernet address. */
static int br_set_mac_address(struct net_device *dev, void *p)
{
	struct net_bridge *br = netdev_priv(dev);
	struct sockaddr *addr = p;

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

	spin_lock_bh(&br->lock);
	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
	br_stp_change_bridge_id(br, addr->sa_data);
	br->flags |= BR_SET_MAC_ADDR;
	spin_unlock_bh(&br->lock);

	return 0;
}

static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
	strcpy(info->driver, "bridge");
	strcpy(info->version, BR_VERSION);
	strcpy(info->fw_version, "N/A");
	strcpy(info->bus_info, "N/A");
}

static int br_set_sg(struct net_device *dev, u32 data)
{
	struct net_bridge *br = netdev_priv(dev);

	if (data)
		br->feature_mask |= NETIF_F_SG;
	else
		br->feature_mask &= ~NETIF_F_SG;

	br_features_recompute(br);
	return 0;
}

static int br_set_tso(struct net_device *dev, u32 data)
{
	struct net_bridge *br = netdev_priv(dev);

	if (data)
		br->feature_mask |= NETIF_F_TSO;
	else
		br->feature_mask &= ~NETIF_F_TSO;

	br_features_recompute(br);
	return 0;
}

static int br_set_tx_csum(struct net_device *dev, u32 data)
{
	struct net_bridge *br = netdev_priv(dev);

	if (data)
		br->feature_mask |= NETIF_F_NO_CSUM;
	else
		br->feature_mask &= ~NETIF_F_ALL_CSUM;

	br_features_recompute(br);
	return 0;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static bool br_devices_support_netpoll(struct net_bridge *br)
{
	struct net_bridge_port *p;
	bool ret = true;
	int count = 0;
	unsigned long flags;

	spin_lock_irqsave(&br->lock, flags);
	list_for_each_entry(p, &br->port_list, list) {
		count++;
		if ((p->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
		    !p->dev->netdev_ops->ndo_poll_controller)
			ret = false;
	}
	spin_unlock_irqrestore(&br->lock, flags);
	return count != 0 && ret;
}

void br_netpoll_cleanup(struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_port *p, *n;
	const struct net_device_ops *ops;

	br->dev->npinfo = NULL;
	list_for_each_entry_safe(p, n, &br->port_list, list) {
		if (p->dev) {
			ops = p->dev->netdev_ops;
			if (ops->ndo_netpoll_cleanup)
				ops->ndo_netpoll_cleanup(p->dev);
			else
				p->dev->npinfo = NULL;
		}
	}
}

void br_netpoll_disable(struct net_bridge *br,
			struct net_device *dev)
{
	if (br_devices_support_netpoll(br))
		br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
	if (dev->netdev_ops->ndo_netpoll_cleanup)
		dev->netdev_ops->ndo_netpoll_cleanup(dev);
	else
		dev->npinfo = NULL;
}

void br_netpoll_enable(struct net_bridge *br,
		       struct net_device *dev)
{
	if (br_devices_support_netpoll(br)) {
		br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
		if (br->dev->npinfo)
			dev->npinfo = br->dev->npinfo;
	} else if (!(br->dev->priv_flags & IFF_DISABLE_NETPOLL)) {
		br->dev->priv_flags |= IFF_DISABLE_NETPOLL;
		br_info(br,"new device %s does not support netpoll (disabling)",
			dev->name);
	}
}

#endif

static const struct ethtool_ops br_ethtool_ops = {
	.get_drvinfo    = br_getinfo,
	.get_link	= ethtool_op_get_link,
	.get_tx_csum	= ethtool_op_get_tx_csum,
	.set_tx_csum 	= br_set_tx_csum,
	.get_sg		= ethtool_op_get_sg,
	.set_sg		= br_set_sg,
	.get_tso	= ethtool_op_get_tso,
	.set_tso	= br_set_tso,
	.get_ufo	= ethtool_op_get_ufo,
	.set_ufo	= ethtool_op_set_ufo,
	.get_flags	= ethtool_op_get_flags,
};

static const struct net_device_ops br_netdev_ops = {
	.ndo_open		 = br_dev_open,
	.ndo_stop		 = br_dev_stop,
	.ndo_start_xmit		 = br_dev_xmit,
	.ndo_get_stats		 = br_get_stats,
	.ndo_set_mac_address	 = br_set_mac_address,
	.ndo_set_multicast_list	 = br_dev_set_multicast_list,
	.ndo_change_mtu		 = br_change_mtu,
	.ndo_do_ioctl		 = br_dev_ioctl,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_netpoll_cleanup	 = br_netpoll_cleanup,
#endif
};

static void br_dev_free(struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);

	free_percpu(br->stats);
	free_netdev(dev);
}

void br_dev_setup(struct net_device *dev)
{
	random_ether_addr(dev->dev_addr);
	ether_setup(dev);

	dev->netdev_ops = &br_netdev_ops;
	dev->destructor = br_dev_free;
	SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
	dev->tx_queue_len = 0;
	dev->priv_flags = IFF_EBRIDGE;

	dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
			NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
			NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Device handling code
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Lennert Buytenhek <buytenh@gnu.org>
	7	*
1da177e4 LT	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/netdevice.h>
c06ee961	16	#include <linux/netpoll.h>
4505a3ef	17	#include <linux/etherdevice.h>
edb5e46f	18	#include <linux/ethtool.h>
c06ee961	19	#include <linux/list.h>
ea2d9b41	20	#include <linux/netfilter_bridge.h>
4505a3ef	21
1da177e4 LT	22	#include <asm/uaccess.h>
	23	#include "br_private.h"
	24
eeaf61d8	25	/* net device transmit always called with BH disabled */
6fef4c0c	26	netdev_tx_t br_dev_xmit(struct sk_buff skb, struct net_device dev)
1da177e4 LT	27	{
	28	struct net_bridge *br = netdev_priv(dev);
	29	const unsigned char *dest = skb->data;
	30	struct net_bridge_fdb_entry *dst;
c4fcb78c	31	struct net_bridge_mdb_entry *mdst;
14bb4789	32	struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
1da177e4	33
ea2d9b41 BDS	34	#ifdef CONFIG_BRIDGE_NETFILTER
	35	if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
	36	br_nf_pre_routing_finish_bridge_slow(skb);
	37	return NETDEV_TX_OK;
	38	}
	39	#endif
	40
14bb4789	41	brstats->tx_packets++;
14bb4789	42	brstats->tx_bytes += skb->len;
6088a539	43
14bb4789	44	BR_INPUT_SKB_CB(skb)->brdev = dev;
1da177e4	45
459a98ed	46	skb_reset_mac_header(skb);
1da177e4 LT	47	skb_pull(skb, ETH_HLEN);
1da177e4 LT	48
eeaf61d8	49	rcu_read_lock();
7180f775	50	if (is_multicast_ether_addr(dest)) {
6d1d1d39 HX	51	if (br_multicast_rcv(br, NULL, skb)) {
6d1d1d39 HX	52	kfree_skb(skb);
c4fcb78c	53	goto out;
6d1d1d39	54	}
c4fcb78c HX	55
c4fcb78c HX	56	mdst = br_mdb_get(br, skb);
32dec5dd	57	if (mdst \|\| BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
c4fcb78c HX	58	br_multicast_deliver(mdst, skb);
	59	else
	60	br_flood_deliver(br, skb);
	61	} else if ((dst = __br_fdb_get(br, dest)) != NULL)
1da177e4 LT	62	br_deliver(dst->dst, skb);
1da177e4 LT	63	else
e081e1e3	64	br_flood_deliver(br, skb);
1da177e4	65
c4fcb78c	66	out:
eeaf61d8	67	rcu_read_unlock();
6ed10654	68	return NETDEV_TX_OK;
1da177e4 LT	69	}
	70
	71	static int br_dev_open(struct net_device *dev)
	72	{
81d35307	73	struct net_bridge *br = netdev_priv(dev);
1da177e4	74
81d35307 SH	75	br_features_recompute(br);
	76	netif_start_queue(dev);
	77	br_stp_enable_bridge(br);
3fe2d7c7	78	br_multicast_open(br);
1da177e4 LT	79
	80	return 0;
	81	}
	82
	83	static void br_dev_set_multicast_list(struct net_device *dev)
	84	{
	85	}
	86
	87	static int br_dev_stop(struct net_device *dev)
	88	{
3fe2d7c7 HX	89	struct net_bridge *br = netdev_priv(dev);
	90
	91	br_stp_disable_bridge(br);
	92	br_multicast_stop(br);
1da177e4 LT	93
	94	netif_stop_queue(dev);
	95
	96	return 0;
	97	}
	98
14bb4789	99	static struct net_device_stats br_get_stats(struct net_device dev)
	100	{
	101	struct net_bridge *br = netdev_priv(dev);
	102	struct net_device_stats *stats = &dev->stats;
	103	struct br_cpu_netstats sum = { 0 };
	104	unsigned int cpu;
	105
	106	for_each_possible_cpu(cpu) {
	107	const struct br_cpu_netstats *bstats
	108	= per_cpu_ptr(br->stats, cpu);
	109
	110	sum.tx_bytes += bstats->tx_bytes;
	111	sum.tx_packets += bstats->tx_packets;
	112	sum.rx_bytes += bstats->rx_bytes;
	113	sum.rx_packets += bstats->rx_packets;
	114	}
	115
	116	stats->tx_bytes = sum.tx_bytes;
	117	stats->tx_packets = sum.tx_packets;
	118	stats->rx_bytes = sum.rx_bytes;
	119	stats->rx_packets = sum.rx_packets;
	120
	121	return stats;
	122	}
	123
1da177e4 LT	124	static int br_change_mtu(struct net_device *dev, int new_mtu)
1da177e4 LT	125	{
4adf0af6 SW	126	struct net_bridge *br = netdev_priv(dev);
4adf0af6 SW	127	if (new_mtu < 68 \|\| new_mtu > br_min_mtu(br))
1da177e4 LT	128	return -EINVAL;
	129
	130	dev->mtu = new_mtu;
4adf0af6 SW	131
	132	#ifdef CONFIG_BRIDGE_NETFILTER
	133	/* remember the MTU in the rtable for PMTU */
	134	br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
	135	#endif
	136
1da177e4 LT	137	return 0;
	138	}
	139
ffe1d49c	140	/* Allow setting mac address to any valid ethernet address. */
4505a3ef SH	141	static int br_set_mac_address(struct net_device dev, void p)
	142	{
	143	struct net_bridge *br = netdev_priv(dev);
	144	struct sockaddr *addr = p;
ffe1d49c SH	145
	146	if (!is_valid_ether_addr(addr->sa_data))
	147	return -EINVAL;
4505a3ef SH	148
4505a3ef SH	149	spin_lock_bh(&br->lock);
ffe1d49c SH	150	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
ffe1d49c SH	151	br_stp_change_bridge_id(br, addr->sa_data);
92c0574f	152	br->flags \|= BR_SET_MAC_ADDR;
4505a3ef SH	153	spin_unlock_bh(&br->lock);
4505a3ef SH	154
ffe1d49c	155	return 0;
4505a3ef SH	156	}
4505a3ef SH	157
edb5e46f SH	158	static void br_getinfo(struct net_device dev, struct ethtool_drvinfo info)
	159	{
	160	strcpy(info->driver, "bridge");
	161	strcpy(info->version, BR_VERSION);
	162	strcpy(info->fw_version, "N/A");
	163	strcpy(info->bus_info, "N/A");
	164	}
	165
	166	static int br_set_sg(struct net_device *dev, u32 data)
	167	{
	168	struct net_bridge *br = netdev_priv(dev);
	169
	170	if (data)
	171	br->feature_mask \|= NETIF_F_SG;
	172	else
	173	br->feature_mask &= ~NETIF_F_SG;
	174
	175	br_features_recompute(br);
	176	return 0;
	177	}
	178
	179	static int br_set_tso(struct net_device *dev, u32 data)
	180	{
	181	struct net_bridge *br = netdev_priv(dev);
	182
	183	if (data)
	184	br->feature_mask \|= NETIF_F_TSO;
	185	else
	186	br->feature_mask &= ~NETIF_F_TSO;
	187
	188	br_features_recompute(br);
	189	return 0;
	190	}
	191
	192	static int br_set_tx_csum(struct net_device *dev, u32 data)
	193	{
	194	struct net_bridge *br = netdev_priv(dev);
	195
	196	if (data)
2c6cc0d8	197	br->feature_mask \|= NETIF_F_NO_CSUM;
edb5e46f	198	else
2c6cc0d8	199	br->feature_mask &= ~NETIF_F_ALL_CSUM;
edb5e46f SH	200
	201	br_features_recompute(br);
	202	return 0;
	203	}
	204
c06ee961	205	#ifdef CONFIG_NET_POLL_CONTROLLER
cfb478da	206	static bool br_devices_support_netpoll(struct net_bridge *br)
c06ee961 WC	207	{
	208	struct net_bridge_port *p;
	209	bool ret = true;
	210	int count = 0;
	211	unsigned long flags;
	212
	213	spin_lock_irqsave(&br->lock, flags);
	214	list_for_each_entry(p, &br->port_list, list) {
	215	count++;
	216	if ((p->dev->priv_flags & IFF_DISABLE_NETPOLL) \|\|
	217	!p->dev->netdev_ops->ndo_poll_controller)
	218	ret = false;
	219	}
	220	spin_unlock_irqrestore(&br->lock, flags);
	221	return count != 0 && ret;
	222	}
	223
cfb478da	224	void br_netpoll_cleanup(struct net_device *dev)
c06ee961	225	{
cfb478da	226	struct net_bridge *br = netdev_priv(dev);
c06ee961 WC	227	struct net_bridge_port p, n;
	228	const struct net_device_ops *ops;
	229
	230	br->dev->npinfo = NULL;
	231	list_for_each_entry_safe(p, n, &br->port_list, list) {
	232	if (p->dev) {
	233	ops = p->dev->netdev_ops;
	234	if (ops->ndo_netpoll_cleanup)
	235	ops->ndo_netpoll_cleanup(p->dev);
	236	else
	237	p->dev->npinfo = NULL;
	238	}
	239	}
	240	}
	241
cfb478da	242	void br_netpoll_disable(struct net_bridge *br,
	243	struct net_device *dev)
	244	{
	245	if (br_devices_support_netpoll(br))
	246	br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
	247	if (dev->netdev_ops->ndo_netpoll_cleanup)
	248	dev->netdev_ops->ndo_netpoll_cleanup(dev);
	249	else
	250	dev->npinfo = NULL;
	251	}
c06ee961	252
cfb478da	253	void br_netpoll_enable(struct net_bridge *br,
cfb478da	254	struct net_device *dev)
c06ee961	255	{
cfb478da	256	if (br_devices_support_netpoll(br)) {
	257	br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
	258	if (br->dev->npinfo)
	259	dev->npinfo = br->dev->npinfo;
	260	} else if (!(br->dev->priv_flags & IFF_DISABLE_NETPOLL)) {
	261	br->dev->priv_flags \|= IFF_DISABLE_NETPOLL;
28a16c97	262	br_info(br,"new device %s does not support netpoll (disabling)",
28a16c97	263	dev->name);
cfb478da	264	}
c06ee961 WC	265	}
	266
	267	#endif
	268
a2dbb882	269	static const struct ethtool_ops br_ethtool_ops = {
e4119a43 SH	270	.get_drvinfo = br_getinfo,
	271	.get_link = ethtool_op_get_link,
	272	.get_tx_csum = ethtool_op_get_tx_csum,
	273	.set_tx_csum = br_set_tx_csum,
	274	.get_sg = ethtool_op_get_sg,
	275	.set_sg = br_set_sg,
	276	.get_tso = ethtool_op_get_tso,
	277	.set_tso = br_set_tso,
	278	.get_ufo = ethtool_op_get_ufo,
72dad218	279	.set_ufo = ethtool_op_set_ufo,
e4119a43	280	.get_flags = ethtool_op_get_flags,
edb5e46f SH	281	};
edb5e46f SH	282
a2dbb882 SH	283	static const struct net_device_ops br_netdev_ops = {
	284	.ndo_open = br_dev_open,
	285	.ndo_stop = br_dev_stop,
00829823	286	.ndo_start_xmit = br_dev_xmit,
14bb4789	287	.ndo_get_stats = br_get_stats,
00829823 SH	288	.ndo_set_mac_address = br_set_mac_address,
	289	.ndo_set_multicast_list = br_dev_set_multicast_list,
	290	.ndo_change_mtu = br_change_mtu,
	291	.ndo_do_ioctl = br_dev_ioctl,
c06ee961 WC	292	#ifdef CONFIG_NET_POLL_CONTROLLER
c06ee961 WC	293	.ndo_netpoll_cleanup = br_netpoll_cleanup,
c06ee961	294	#endif
a2dbb882 SH	295	};
a2dbb882 SH	296
14bb4789	297	static void br_dev_free(struct net_device *dev)
	298	{
	299	struct net_bridge *br = netdev_priv(dev);
	300
	301	free_percpu(br->stats);
	302	free_netdev(dev);
	303	}
	304
1da177e4 LT	305	void br_dev_setup(struct net_device *dev)
1da177e4 LT	306	{
3ae41254	307	random_ether_addr(dev->dev_addr);
1da177e4 LT	308	ether_setup(dev);
1da177e4 LT	309
a2dbb882	310	dev->netdev_ops = &br_netdev_ops;
14bb4789	311	dev->destructor = br_dev_free;
9d6f229f	312	SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
1da177e4	313	dev->tx_queue_len = 0;
1da177e4	314	dev->priv_flags = IFF_EBRIDGE;
edb5e46f	315
9d6f229f	316	dev->features = NETIF_F_SG \| NETIF_F_FRAGLIST \| NETIF_F_HIGHDMA \|
4aa678ba	317	NETIF_F_GSO_MASK \| NETIF_F_NO_CSUM \| NETIF_F_LLTX \|
b63365a2	318	NETIF_F_NETNS_LOCAL \| NETIF_F_GSO;
1da177e4	319	}