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authorSimon Wunderlich <siwu@hrz.tu-chemnitz.de>2008-07-30 16:27:55 -0700
committerDavid S. Miller <davem@davemloft.net>2008-07-30 16:27:55 -0700
commit4adf0af6818f3ea52421dc0bae836cfaf20ef72a (patch)
tree480835bbc913896cd726e3f90d20ce8c859636f7 /net/bridge/br_device.c
parente62112c53acfefc67ccfbdc1895eebccf866bc1b (diff)
bridge: send correct MTU value in PMTU (revised)
When bridging interfaces with different MTUs, the bridge correctly chooses the minimum of the MTUs of the physical devices as the bridges MTU. But when a frame is passed which fits through the incoming, but not through the outgoing interface, a "Fragmentation Needed" packet is generated. However, the propagated MTU is hardcoded to 1500, which is wrong in this situation. The sender will repeat the packet again with the same frame size, and the same problem will occur again. Instead of sending 1500, the (correct) MTU value of the bridge is now sent via PMTU. To achieve this, the corresponding rtable structure is stored in its net_bridge structure. Modified to get rid of fake_net_device as well. Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_device.c')
-rw-r--r--net/bridge/br_device.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index d9449df7cad..9b58d70b0e7 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -68,10 +68,17 @@ static int br_dev_stop(struct net_device *dev)
static int br_change_mtu(struct net_device *dev, int new_mtu)
{
- if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev)))
+ 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.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
+#endif
+
return 0;
}