Try the following (2.4) patch to allow bridge to be MTU aware.
diff -Nru a/net/bridge/br_device.c b/net/bridge/br_device.c
--- a/net/bridge/br_device.c 2004-06-30 10:30:31 -07:00
+++ b/net/bridge/br_device.c 2004-06-30 10:30:31 -07:00
@@ -121,6 +121,22 @@
return -1;
}
+static int br_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct net_bridge *br = dev->priv;
+ int max_mtu;
+
+ read_lock_bh(&br->lock);
+ max_mtu = br_min_mtu(br);
+ read_unlock_bh(&br->lock);
+
+ if (new_mtu < 68 || new_mtu > max_mtu)
+ return -EINVAL;
+
+ dev->mtu = new_mtu;
+ return 0;
+}
+
void br_dev_setup(struct net_device *dev)
{
memset(dev->dev_addr, 0, ETH_ALEN);
@@ -134,4 +150,5 @@
dev->accept_fastpath = br_dev_accept_fastpath;
dev->tx_queue_len = 0;
dev->set_mac_address = NULL;
+ dev->change_mtu = br_change_mtu;
}
diff -Nru a/net/bridge/br_if.c b/net/bridge/br_if.c
--- a/net/bridge/br_if.c 2004-06-30 10:30:31 -07:00
+++ b/net/bridge/br_if.c 2004-06-30 10:30:31 -07:00
@@ -220,6 +220,24 @@
return 0;
}
+int br_min_mtu(struct net_bridge *br)
+{
+ struct net_bridge_port *p;
+ int mtu;
+
+ p = br->port_list;
+ if (!p)
+ mtu = 1500;
+ else {
+ mtu = p->dev->mtu;
+ while ((p = p->next) != NULL) {
+ if (p->dev->mtu < mtu)
+ mtu = p->dev->mtu;
+ }
+ }
+ return mtu;
+}
+
int br_add_if(struct net_bridge *br, struct net_device *dev)
{
struct net_bridge_port *p;
@@ -250,6 +268,7 @@
br_fdb_insert(br, p, dev->dev_addr, 1);
if ((br->dev.flags & IFF_UP) && (dev->flags & IFF_UP))
br_stp_enable_port(p);
+ br->dev.mtu = br_min_mtu(dev->priv);
write_unlock_bh(&br->lock);
return 0;
diff -Nru a/net/bridge/br_private.h b/net/bridge/br_private.h
--- a/net/bridge/br_private.h 2004-06-30 10:30:31 -07:00
+++ b/net/bridge/br_private.h 2004-06-30 10:30:31 -07:00
@@ -164,6 +164,7 @@
int num);
extern void br_get_port_ifindices(struct net_bridge *br,
int *ifindices);
+extern int br_min_mtu(struct net_bridge *br);
/* br_input.c */
extern void br_handle_frame(struct sk_buff *skb);
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