[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 no BH (preempt_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);

	if (is_multicast_ether_addr(dest)) {
		if (br_multicast_rcv(br, NULL, 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:
	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.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;
}

static void br_poll_controller(struct net_device *br_dev)
{
	struct netpoll *np = br_dev->npinfo->netpoll;

	if (np->real_dev != br_dev)
		netpoll_poll_dev(np->real_dev);
}

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,
	.ndo_poll_controller	 = br_poll_controller,
#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
f8ae737d	25	/* net device transmit always called with no BH (preempt_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
7180f775	49	if (is_multicast_ether_addr(dest)) {
c4fcb78c HX	50	if (br_multicast_rcv(br, NULL, skb))
	51	goto out;
	52
	53	mdst = br_mdb_get(br, skb);
32dec5dd	54	if (mdst \|\| BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
c4fcb78c HX	55	br_multicast_deliver(mdst, skb);
	56	else
	57	br_flood_deliver(br, skb);
	58	} else if ((dst = __br_fdb_get(br, dest)) != NULL)
1da177e4 LT	59	br_deliver(dst->dst, skb);
1da177e4 LT	60	else
e081e1e3	61	br_flood_deliver(br, skb);
1da177e4	62
c4fcb78c	63	out:
6ed10654	64	return NETDEV_TX_OK;
1da177e4 LT	65	}
	66
	67	static int br_dev_open(struct net_device *dev)
	68	{
81d35307	69	struct net_bridge *br = netdev_priv(dev);
1da177e4	70
81d35307 SH	71	br_features_recompute(br);
	72	netif_start_queue(dev);
	73	br_stp_enable_bridge(br);
3fe2d7c7	74	br_multicast_open(br);
1da177e4 LT	75
	76	return 0;
	77	}
	78
	79	static void br_dev_set_multicast_list(struct net_device *dev)
	80	{
	81	}
	82
	83	static int br_dev_stop(struct net_device *dev)
	84	{
3fe2d7c7 HX	85	struct net_bridge *br = netdev_priv(dev);
	86
	87	br_stp_disable_bridge(br);
	88	br_multicast_stop(br);
1da177e4 LT	89
	90	netif_stop_queue(dev);
	91
	92	return 0;
	93	}
	94
14bb4789	95	static struct net_device_stats br_get_stats(struct net_device dev)
	96	{
	97	struct net_bridge *br = netdev_priv(dev);
	98	struct net_device_stats *stats = &dev->stats;
	99	struct br_cpu_netstats sum = { 0 };
	100	unsigned int cpu;
	101
	102	for_each_possible_cpu(cpu) {
	103	const struct br_cpu_netstats *bstats
	104	= per_cpu_ptr(br->stats, cpu);
	105
	106	sum.tx_bytes += bstats->tx_bytes;
	107	sum.tx_packets += bstats->tx_packets;
	108	sum.rx_bytes += bstats->rx_bytes;
	109	sum.rx_packets += bstats->rx_packets;
	110	}
	111
	112	stats->tx_bytes = sum.tx_bytes;
	113	stats->tx_packets = sum.tx_packets;
	114	stats->rx_bytes = sum.rx_bytes;
	115	stats->rx_packets = sum.rx_packets;
	116
	117	return stats;
	118	}
	119
1da177e4 LT	120	static int br_change_mtu(struct net_device *dev, int new_mtu)
1da177e4 LT	121	{
4adf0af6 SW	122	struct net_bridge *br = netdev_priv(dev);
4adf0af6 SW	123	if (new_mtu < 68 \|\| new_mtu > br_min_mtu(br))
1da177e4 LT	124	return -EINVAL;
	125
	126	dev->mtu = new_mtu;
4adf0af6 SW	127
	128	#ifdef CONFIG_BRIDGE_NETFILTER
	129	/* remember the MTU in the rtable for PMTU */
d8d1f30b	130	br->fake_rtable.dst.metrics[RTAX_MTU - 1] = new_mtu;
4adf0af6 SW	131	#endif
4adf0af6 SW	132
1da177e4 LT	133	return 0;
	134	}
	135
ffe1d49c	136	/* Allow setting mac address to any valid ethernet address. */
4505a3ef SH	137	static int br_set_mac_address(struct net_device dev, void p)
	138	{
	139	struct net_bridge *br = netdev_priv(dev);
	140	struct sockaddr *addr = p;
ffe1d49c SH	141
	142	if (!is_valid_ether_addr(addr->sa_data))
	143	return -EINVAL;
4505a3ef SH	144
4505a3ef SH	145	spin_lock_bh(&br->lock);
ffe1d49c SH	146	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
ffe1d49c SH	147	br_stp_change_bridge_id(br, addr->sa_data);
92c0574f	148	br->flags \|= BR_SET_MAC_ADDR;
4505a3ef SH	149	spin_unlock_bh(&br->lock);
4505a3ef SH	150
ffe1d49c	151	return 0;
4505a3ef SH	152	}
4505a3ef SH	153
edb5e46f SH	154	static void br_getinfo(struct net_device dev, struct ethtool_drvinfo info)
	155	{
	156	strcpy(info->driver, "bridge");
	157	strcpy(info->version, BR_VERSION);
	158	strcpy(info->fw_version, "N/A");
	159	strcpy(info->bus_info, "N/A");
	160	}
	161
	162	static int br_set_sg(struct net_device *dev, u32 data)
	163	{
	164	struct net_bridge *br = netdev_priv(dev);
	165
	166	if (data)
	167	br->feature_mask \|= NETIF_F_SG;
	168	else
	169	br->feature_mask &= ~NETIF_F_SG;
	170
	171	br_features_recompute(br);
	172	return 0;
	173	}
	174
	175	static int br_set_tso(struct net_device *dev, u32 data)
	176	{
	177	struct net_bridge *br = netdev_priv(dev);
	178
	179	if (data)
	180	br->feature_mask \|= NETIF_F_TSO;
	181	else
	182	br->feature_mask &= ~NETIF_F_TSO;
	183
	184	br_features_recompute(br);
	185	return 0;
	186	}
	187
	188	static int br_set_tx_csum(struct net_device *dev, u32 data)
	189	{
	190	struct net_bridge *br = netdev_priv(dev);
	191
	192	if (data)
2c6cc0d8	193	br->feature_mask \|= NETIF_F_NO_CSUM;
edb5e46f	194	else
2c6cc0d8	195	br->feature_mask &= ~NETIF_F_ALL_CSUM;
edb5e46f SH	196
	197	br_features_recompute(br);
	198	return 0;
	199	}
	200
c06ee961	201	#ifdef CONFIG_NET_POLL_CONTROLLER
cfb478da	202	static bool br_devices_support_netpoll(struct net_bridge *br)
c06ee961 WC	203	{
	204	struct net_bridge_port *p;
	205	bool ret = true;
	206	int count = 0;
	207	unsigned long flags;
	208
	209	spin_lock_irqsave(&br->lock, flags);
	210	list_for_each_entry(p, &br->port_list, list) {
	211	count++;
	212	if ((p->dev->priv_flags & IFF_DISABLE_NETPOLL) \|\|
	213	!p->dev->netdev_ops->ndo_poll_controller)
	214	ret = false;
	215	}
	216	spin_unlock_irqrestore(&br->lock, flags);
	217	return count != 0 && ret;
	218	}
	219
	220	static void br_poll_controller(struct net_device *br_dev)
	221	{
	222	struct netpoll *np = br_dev->npinfo->netpoll;
	223
	224	if (np->real_dev != br_dev)
	225	netpoll_poll_dev(np->real_dev);
	226	}
	227
cfb478da	228	void br_netpoll_cleanup(struct net_device *dev)
c06ee961	229	{
cfb478da	230	struct net_bridge *br = netdev_priv(dev);
c06ee961 WC	231	struct net_bridge_port p, n;
	232	const struct net_device_ops *ops;
	233
	234	br->dev->npinfo = NULL;
	235	list_for_each_entry_safe(p, n, &br->port_list, list) {
	236	if (p->dev) {
	237	ops = p->dev->netdev_ops;
	238	if (ops->ndo_netpoll_cleanup)
	239	ops->ndo_netpoll_cleanup(p->dev);
	240	else
	241	p->dev->npinfo = NULL;
	242	}
	243	}
	244	}
	245
cfb478da	246	void br_netpoll_disable(struct net_bridge *br,
	247	struct net_device *dev)
	248	{
	249	if (br_devices_support_netpoll(br))
	250	br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
	251	if (dev->netdev_ops->ndo_netpoll_cleanup)
	252	dev->netdev_ops->ndo_netpoll_cleanup(dev);
	253	else
	254	dev->npinfo = NULL;
	255	}
c06ee961	256
cfb478da	257	void br_netpoll_enable(struct net_bridge *br,
cfb478da	258	struct net_device *dev)
c06ee961	259	{
cfb478da	260	if (br_devices_support_netpoll(br)) {
	261	br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
	262	if (br->dev->npinfo)
	263	dev->npinfo = br->dev->npinfo;
	264	} else if (!(br->dev->priv_flags & IFF_DISABLE_NETPOLL)) {
	265	br->dev->priv_flags \|= IFF_DISABLE_NETPOLL;
28a16c97	266	br_info(br,"new device %s does not support netpoll (disabling)",
28a16c97	267	dev->name);
cfb478da	268	}
c06ee961 WC	269	}
	270
	271	#endif
	272
a2dbb882	273	static const struct ethtool_ops br_ethtool_ops = {
e4119a43 SH	274	.get_drvinfo = br_getinfo,
	275	.get_link = ethtool_op_get_link,
	276	.get_tx_csum = ethtool_op_get_tx_csum,
	277	.set_tx_csum = br_set_tx_csum,
	278	.get_sg = ethtool_op_get_sg,
	279	.set_sg = br_set_sg,
	280	.get_tso = ethtool_op_get_tso,
	281	.set_tso = br_set_tso,
	282	.get_ufo = ethtool_op_get_ufo,
72dad218	283	.set_ufo = ethtool_op_set_ufo,
e4119a43	284	.get_flags = ethtool_op_get_flags,
edb5e46f SH	285	};
edb5e46f SH	286
a2dbb882 SH	287	static const struct net_device_ops br_netdev_ops = {
	288	.ndo_open = br_dev_open,
	289	.ndo_stop = br_dev_stop,
00829823	290	.ndo_start_xmit = br_dev_xmit,
14bb4789	291	.ndo_get_stats = br_get_stats,
00829823 SH	292	.ndo_set_mac_address = br_set_mac_address,
	293	.ndo_set_multicast_list = br_dev_set_multicast_list,
	294	.ndo_change_mtu = br_change_mtu,
	295	.ndo_do_ioctl = br_dev_ioctl,
c06ee961 WC	296	#ifdef CONFIG_NET_POLL_CONTROLLER
	297	.ndo_netpoll_cleanup = br_netpoll_cleanup,
	298	.ndo_poll_controller = br_poll_controller,
	299	#endif
a2dbb882 SH	300	};
a2dbb882 SH	301
14bb4789	302	static void br_dev_free(struct net_device *dev)
	303	{
	304	struct net_bridge *br = netdev_priv(dev);
	305
	306	free_percpu(br->stats);
	307	free_netdev(dev);
	308	}
	309
1da177e4 LT	310	void br_dev_setup(struct net_device *dev)
1da177e4 LT	311	{
3ae41254	312	random_ether_addr(dev->dev_addr);
1da177e4 LT	313	ether_setup(dev);
1da177e4 LT	314
a2dbb882	315	dev->netdev_ops = &br_netdev_ops;
14bb4789	316	dev->destructor = br_dev_free;
9d6f229f	317	SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
1da177e4	318	dev->tx_queue_len = 0;
1da177e4	319	dev->priv_flags = IFF_EBRIDGE;
edb5e46f	320
9d6f229f	321	dev->features = NETIF_F_SG \| NETIF_F_FRAGLIST \| NETIF_F_HIGHDMA \|
4aa678ba	322	NETIF_F_GSO_MASK \| NETIF_F_NO_CSUM \| NETIF_F_LLTX \|
b63365a2	323	NETIF_F_NETNS_LOCAL \| NETIF_F_GSO;
1da177e4	324	}