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[BRIDGE]: allow setting hardware address of bridge pseudo-dev

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Some people are using bridging to hide multiple machines from an ISP
that restricts by MAC address. So in that case allow the bridge mac
address to be set to any of the existing interfaces.  I don't want to
allow any arbitrary value and confuse STP.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger
2005-12-21 18:51:49 -08:00
committed by David S. Miller
parent fbe9cc4a87
commit 4505a3ef72
3 changed files with 28 additions and 4 deletions
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28
net/bridge/br_device.c
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@ -15,7 +15,8 @@
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <asm/uaccess.h>
#include "br_private.h"
@ -82,6 +83,29 @@ static int br_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}
/* Allow setting mac address of pseudo-bridge to be same as
* any of the bound interfaces
*/
static int br_set_mac_address(struct net_device *dev, void *p)
{
struct net_bridge *br = netdev_priv(dev);
struct sockaddr *addr = p;
struct net_bridge_port *port;
int err = -EADDRNOTAVAIL;
spin_lock_bh(&br->lock);
list_for_each_entry(port, &br->port_list, list) {
if (!compare_ether_addr(port->dev->dev_addr, addr->sa_data)) {
br_stp_change_bridge_id(br, addr->sa_data);
err = 0;
break;
}
}
spin_unlock_bh(&br->lock);
return err;
}
void br_dev_setup(struct net_device *dev)
{
memset(dev->dev_addr, 0, ETH_ALEN);
@ -98,6 +122,6 @@ void br_dev_setup(struct net_device *dev)
SET_MODULE_OWNER(dev);
dev->stop = br_dev_stop;
dev->tx_queue_len = 0;
dev->set_mac_address = NULL;
dev->set_mac_address = br_set_mac_address;
dev->priv_flags = IFF_EBRIDGE;
}