Commit bb900b27 authored by stephen hemminger's avatar stephen hemminger Committed by David S. Miller
Browse files

bridge: allow creating bridge devices with netlink 



Add netlink device ops to allow creating bridge device via netlink.
This works in a manner similar to vlan, macvlan and bonding.

Example:
  # ip link add link dev br0 type bridge
  # ip link del dev br0

The change required rearranging initializtion code to deal with
being called by create link. Most of the initialization happens
in br_dev_setup, but allocation of stats is done in ndo_init callback
to deal with allocation failure. Sysfs setup has to wait until
after the network device kobject is registered.

Signed-off-by: default avatarStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 36fd2b63

net/bridge/br.c

+1 −0
Original line number Diff line number Diff line
@@ -104,3 +104,4 @@ module_init(br_init) 
module_exit(br_deinit)

MODULE_LICENSE("GPL");

MODULE_VERSION(BR_VERSION);

MODULE_ALIAS_RTNL_LINK("bridge");

net/bridge/br_device.c

+41 −0
Original line number Diff line number Diff line
@@ -74,6 +74,17 @@ out: 
	return NETDEV_TX_OK;

}



static int br_dev_init(struct net_device *dev)

{

	struct net_bridge *br = netdev_priv(dev);



	br->stats = alloc_percpu(struct br_cpu_netstats);

	if (!br->stats)

		return -ENOMEM;



	return 0;

}



static int br_dev_open(struct net_device *dev)

{

	struct net_bridge *br = netdev_priv(dev);
@@ -334,6 +345,7 @@ static const struct ethtool_ops br_ethtool_ops = { 
static const struct net_device_ops br_netdev_ops = {

	.ndo_open		 = br_dev_open,

	.ndo_stop		 = br_dev_stop,

	.ndo_init		 = br_dev_init,

	.ndo_start_xmit		 = br_dev_xmit,

	.ndo_get_stats64	 = br_get_stats64,

	.ndo_set_mac_address	 = br_set_mac_address,
@@ -357,18 +369,47 @@ static void br_dev_free(struct net_device *dev) 
	free_netdev(dev);

}



static struct device_type br_type = {

	.name	= "bridge",

};



void br_dev_setup(struct net_device *dev)

{

	struct net_bridge *br = netdev_priv(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);

	SET_NETDEV_DEVTYPE(dev, &br_type);

	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 | NETIF_F_HW_VLAN_TX;



	br->dev = dev;

	spin_lock_init(&br->lock);

	INIT_LIST_HEAD(&br->port_list);

	spin_lock_init(&br->hash_lock);



	br->bridge_id.prio[0] = 0x80;

	br->bridge_id.prio[1] = 0x00;



	memcpy(br->group_addr, br_group_address, ETH_ALEN);



	br->feature_mask = dev->features;

	br->stp_enabled = BR_NO_STP;

	br->designated_root = br->bridge_id;

	br->bridge_max_age = br->max_age = 20 * HZ;

	br->bridge_hello_time = br->hello_time = 2 * HZ;

	br->bridge_forward_delay = br->forward_delay = 15 * HZ;

	br->ageing_time = 300 * HZ;



	br_netfilter_rtable_init(br);

	br_stp_timer_init(br);

	br_multicast_init(br);

}

net/bridge/br_if.c

+5 −78
Original line number Diff line number Diff line
@@ -175,56 +175,6 @@ static void del_br(struct net_bridge *br, struct list_head *head) 
	unregister_netdevice_queue(br->dev, head);

}



static struct net_device *new_bridge_dev(struct net *net, const char *name)

{

	struct net_bridge *br;

	struct net_device *dev;



	dev = alloc_netdev(sizeof(struct net_bridge), name,

			   br_dev_setup);



	if (!dev)

		return NULL;

	dev_net_set(dev, net);



	br = netdev_priv(dev);

	br->dev = dev;



	br->stats = alloc_percpu(struct br_cpu_netstats);

	if (!br->stats) {

		free_netdev(dev);

		return NULL;

	}



	spin_lock_init(&br->lock);

	INIT_LIST_HEAD(&br->port_list);

	spin_lock_init(&br->hash_lock);



	br->bridge_id.prio[0] = 0x80;

	br->bridge_id.prio[1] = 0x00;



	memcpy(br->group_addr, br_group_address, ETH_ALEN);



	br->feature_mask = dev->features;

	br->stp_enabled = BR_NO_STP;

	br->designated_root = br->bridge_id;

	br->root_path_cost = 0;

	br->root_port = 0;

	br->bridge_max_age = br->max_age = 20 * HZ;

	br->bridge_hello_time = br->hello_time = 2 * HZ;

	br->bridge_forward_delay = br->forward_delay = 15 * HZ;

	br->topology_change = 0;

	br->topology_change_detected = 0;

	br->ageing_time = 300 * HZ;



	br_netfilter_rtable_init(br);



	br_stp_timer_init(br);

	br_multicast_init(br);



	return dev;

}



/* find an available port number */

static int find_portno(struct net_bridge *br)

{
@@ -277,42 +227,19 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br, 
	return p;

}



static struct device_type br_type = {

	.name	= "bridge",

};



int br_add_bridge(struct net *net, const char *name)

{

	struct net_device *dev;

	int ret;



	dev = new_bridge_dev(net, name);

	dev = alloc_netdev(sizeof(struct net_bridge), name,

			   br_dev_setup);



	if (!dev)

		return -ENOMEM;



	rtnl_lock();

	if (strchr(dev->name, '%')) {

		ret = dev_alloc_name(dev, dev->name);

		if (ret < 0)

			goto out_free;

	}



	SET_NETDEV_DEVTYPE(dev, &br_type);



	ret = register_netdevice(dev);

	if (ret)

		goto out_free;



	ret = br_sysfs_addbr(dev);

	if (ret)

		unregister_netdevice(dev);

 out:

	rtnl_unlock();

	return ret;

	dev_net_set(dev, net);



out_free:

	free_netdev(dev);

	goto out;

	return register_netdev(dev);

}



int br_del_bridge(struct net *net, const char *name)

net/bridge/br_netlink.c

+48 −9
Original line number Diff line number Diff line
@@ -12,9 +12,11 @@ 


#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/etherdevice.h>

#include <net/rtnetlink.h>

#include <net/net_namespace.h>

#include <net/sock.h>



#include "br_private.h"



static inline size_t br_nlmsg_size(void)
@@ -188,24 +190,61 @@ static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 
	return 0;

}



static int br_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 struct rtnl_link_ops br_link_ops __read_mostly = {

	.kind		= "bridge",

	.priv_size	= sizeof(struct net_bridge),

	.setup		= br_dev_setup,

	.validate	= br_validate,

};



int __init br_netlink_init(void)

{

	if (__rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo))

		return -ENOBUFS;



	/* Only the first call to __rtnl_register can fail */

	__rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL);

	int err;



	__rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, br_fdb_add, NULL);

	__rtnl_register(PF_BRIDGE, RTM_DELNEIGH, br_fdb_delete, NULL);

	__rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, br_fdb_dump);

	err = rtnl_link_register(&br_link_ops);

	if (err < 0)

		goto err1;



	err = __rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo);

	if (err)

		goto err2;

	err = __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL);

	if (err)

		goto err3;

	err = __rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, br_fdb_add, NULL);

	if (err)

		goto err3;

	err = __rtnl_register(PF_BRIDGE, RTM_DELNEIGH, br_fdb_delete, NULL);

	if (err)

		goto err3;

	err = __rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, br_fdb_dump);

	if (err)

		goto err3;



	return 0;



err3:

	rtnl_unregister_all(PF_BRIDGE);

err2:

	rtnl_link_unregister(&br_link_ops);

err1:

	return err;

}



void __exit br_netlink_fini(void)

{

	rtnl_link_unregister(&br_link_ops);

	rtnl_unregister_all(PF_BRIDGE);

}

net/bridge/br_notify.c

+6 −0
Original line number Diff line number Diff line
@@ -36,6 +36,12 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v 
	struct net_bridge *br;

	int err;



	/* register of bridge completed, add sysfs entries */

	if ((dev->priv_flags && IFF_EBRIDGE) && event == NETDEV_REGISTER) {

		br_sysfs_addbr(dev);

		return NOTIFY_DONE;

	}



	/* not a port of a bridge */

	p = br_port_get_rtnl(dev);

	if (!p)

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