[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Xen-devel] [RFC v3 1/6] bridge: preserve random init MAC address



From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>

As it is now if you add create a bridge it gets started
with a random MAC address and if you then add a net_device
as a slave but later kick it out you end up with a zero
MAC address. Instead preserve the original random MAC
address and use it.

If you manually set the bridge address that will always
be respected. This change only takes effect if at the time
of computing the new root port we determine we have found
no candidates.

Cc: Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>
Cc: bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxx>
---
 net/bridge/br_device.c  | 1 +
 net/bridge/br_private.h | 1 +
 net/bridge/br_stp_if.c  | 3 +++
 3 files changed, 5 insertions(+)

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index b063050..5f13eac 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -368,6 +368,7 @@ void br_dev_setup(struct net_device *dev)
        br->bridge_id.prio[1] = 0x00;
 
        ether_addr_copy(br->group_addr, eth_reserved_addr_base);
+       ether_addr_copy(br->random_init_addr, dev->dev_addr);
 
        br->stp_enabled = BR_NO_STP;
        br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index e1ca1dc..32a06da 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -240,6 +240,7 @@ struct net_bridge
        unsigned long                   bridge_hello_time;
        unsigned long                   bridge_forward_delay;
 
+       u8                              random_init_addr[ETH_ALEN];
        u8                              group_addr[ETH_ALEN];
        u16                             root_port;
 
diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c
index 189ba1e..4c9ad45 100644
--- a/net/bridge/br_stp_if.c
+++ b/net/bridge/br_stp_if.c
@@ -239,6 +239,9 @@ bool br_stp_recalculate_bridge_id(struct net_bridge *br)
        if (ether_addr_equal(br->bridge_id.addr, addr))
                return false;   /* no change */
 
+       if (ether_addr_equal(addr, br_mac_zero))
+               addr = br->random_init_addr;
+
        br_stp_change_bridge_id(br, addr);
        return true;
 }
-- 
1.9.0


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.