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authorStephen Hemminger <shemminger@osdl.org>2005-12-21 18:51:49 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-01-03 13:11:00 -0800
commit4505a3ef720845b5db3ddb440de13cd4800fd508 (patch)
tree2de3d2fb20d160dc1a04bdb0295882561e4244bc
parentfbe9cc4a87030d5cad5f944ffaef6af7efd119e4 (diff)
[BRIDGE]: allow setting hardware address of bridge pseudo-dev
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>
-rw-r--r--net/bridge/br_device.c28
-rw-r--r--net/bridge/br_private.h1
-rw-r--r--net/bridge/br_stp_if.c3
3 files changed, 28 insertions, 4 deletions
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index f564ee99782..f7a66abf5de 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -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;
}
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index bdf95a74d8c..2c249486476 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -201,6 +201,7 @@ extern void br_stp_disable_bridge(struct net_bridge *br);
extern void br_stp_enable_port(struct net_bridge_port *p);
extern void br_stp_disable_port(struct net_bridge_port *p);
extern void br_stp_recalculate_bridge_id(struct net_bridge *br);
+extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
extern void br_stp_set_bridge_priority(struct net_bridge *br,
u16 newprio);
extern void br_stp_set_port_priority(struct net_bridge_port *p,
diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c
index ac09b6a2352..2d2e969ae25 100644
--- a/net/bridge/br_stp_if.c
+++ b/net/bridge/br_stp_if.c
@@ -120,8 +120,7 @@ void br_stp_disable_port(struct net_bridge_port *p)
}
/* called under bridge lock */
-static void br_stp_change_bridge_id(struct net_bridge *br,
- const unsigned char *addr)
+void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr)
{
unsigned char oldaddr[6];
struct net_bridge_port *p;