1 files changed, 159 insertions, 0 deletions
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
new file mode 100644
index 000000000000..ef9f2095f96e
--- /dev/null
+++ b/net/bridge/br_forward.c
@@ -0,0 +1,159 @@
+/*
+ *	Forwarding decision
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_forward.c,v 1.4 2001/08/14 22:05:57 davem Exp $
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	as published by the Free Software Foundation; either version
+ *	2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_bridge.h>
+#include "br_private.h"
+
+static inline int should_deliver(const struct net_bridge_port *p, 
+				 const struct sk_buff *skb)
+{
+	if (skb->dev == p->dev ||
+	    p->state != BR_STATE_FORWARDING)
+		return 0;
+
+	return 1;
+}
+
+int br_dev_queue_push_xmit(struct sk_buff *skb)
+{
+	if (skb->len > skb->dev->mtu) 
+		kfree_skb(skb);
+	else {
+#ifdef CONFIG_BRIDGE_NETFILTER
+		/* ip_refrag calls ip_fragment, doesn't copy the MAC header. */
+		nf_bridge_maybe_copy_header(skb);
+#endif
+		skb_push(skb, ETH_HLEN);
+
+		dev_queue_xmit(skb);
+	}
+
+	return 0;
+}
+
+int br_forward_finish(struct sk_buff *skb)
+{
+	NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
+			br_dev_queue_push_xmit);
+
+	return 0;
+}
+
+static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
+{
+	skb->dev = to->dev;
+#ifdef CONFIG_NETFILTER_DEBUG
+	skb->nf_debug = 0;
+#endif
+	NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
+			br_forward_finish);
+}
+
+static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
+{
+	struct net_device *indev;
+
+	indev = skb->dev;
+	skb->dev = to->dev;
+	skb->ip_summed = CHECKSUM_NONE;
+
+	NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
+			br_forward_finish);
+}
+
+/* called with rcu_read_lock */
+void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
+{
+	if (should_deliver(to, skb)) {
+		__br_deliver(to, skb);
+		return;
+	}
+
+	kfree_skb(skb);
+}
+
+/* called with rcu_read_lock */
+void br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
+{
+	if (should_deliver(to, skb)) {
+		__br_forward(to, skb);
+		return;
+	}
+
+	kfree_skb(skb);
+}
+
+/* called under bridge lock */
+static void br_flood(struct net_bridge *br, struct sk_buff *skb, int clone,
+	void (*__packet_hook)(const struct net_bridge_port *p, 
+			      struct sk_buff *skb))
+{
+	struct net_bridge_port *p;
+	struct net_bridge_port *prev;
+
+	if (clone) {
+		struct sk_buff *skb2;
+
+		if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
+			br->statistics.tx_dropped++;
+			return;
+		}
+
+		skb = skb2;
+	}
+
+	prev = NULL;
+
+	list_for_each_entry_rcu(p, &br->port_list, list) {
+		if (should_deliver(p, skb)) {
+			if (prev != NULL) {
+				struct sk_buff *skb2;
+
+				if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
+					br->statistics.tx_dropped++;
+					kfree_skb(skb);
+					return;
+				}
+
+				__packet_hook(prev, skb2);
+			}
+
+			prev = p;
+		}
+	}
+
+	if (prev != NULL) {
+		__packet_hook(prev, skb);
+		return;
+	}
+
+	kfree_skb(skb);
+}
+
+
+/* called with rcu_read_lock */
+void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, int clone)
+{
+	br_flood(br, skb, clone, __br_deliver);
+}
+
+/* called under bridge lock */
+void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, int clone)
+{
+	br_flood(br, skb, clone, __br_forward);
+}