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);
+}