*** empty log message ***

1 files changed, 181 insertions, 0 deletions

diff --git a/br-nf-bds/linux2.5/net/bridge/br_input.c b/br-nf-bds/linux2.5/net/bridge/br_input.c
new file mode 100644
index 0000000..d467dda
--- /dev/null
+++ b/br-nf-bds/linux2.5/net/bridge/br_input.c
@@ -0,0 +1,181 @@
+/*
+ *	Handle incoming frames
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_input.c,v 1.1 2002/08/24 09:28:29 bdschuym 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/etherdevice.h>
+#include <linux/if_bridge.h>
+#include <linux/netfilter_bridge.h>
+#include "br_private.h"
+#if defined(CONFIG_BRIDGE_EBT_BROUTE) || \
+    defined(CONFIG_BRIDGE_EBT_BROUTE_MODULE)
+#include <linux/netfilter.h>
+#endif
+
+unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
+
+static int br_pass_frame_up_finish(struct sk_buff *skb)
+{
+	netif_rx(skb);
+
+	return 0;
+}
+
+static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb)
+{
+	struct net_device *indev;
+
+	br->statistics.rx_packets++;
+	br->statistics.rx_bytes += skb->len;
+
+	indev = skb->dev;
+	skb->dev = &br->dev;
+	skb->pkt_type = PACKET_HOST;
+	skb_push(skb, ETH_HLEN);
+	skb->protocol = eth_type_trans(skb, &br->dev);
+
+	NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
+			br_pass_frame_up_finish);
+}
+
+int br_handle_frame_finish(struct sk_buff *skb)
+{
+	struct net_bridge *br;
+	unsigned char *dest;
+	struct net_bridge_fdb_entry *dst;
+	struct net_bridge_port *p;
+	int passedup;
+
+	dest = skb->mac.ethernet->h_dest;
+
+	p = skb->dev->br_port;
+	if (p == NULL)
+		goto err_nolock;
+
+	br = p->br;
+	read_lock(&br->lock);
+	if (skb->dev->br_port == NULL)
+		goto err;
+
+	passedup = 0;
+	if (br->dev.flags & IFF_PROMISC) {
+		struct sk_buff *skb2;
+
+		skb2 = skb_clone(skb, GFP_ATOMIC);
+		if (skb2 != NULL) {
+			passedup = 1;
+			br_pass_frame_up(br, skb2);
+		}
+	}
+
+	if (dest[0] & 1) {
+		br_flood_forward(br, skb, !passedup);
+		if (!passedup)
+			br_pass_frame_up(br, skb);
+		goto out;
+	}
+
+	dst = br_fdb_get(br, dest);
+	if (dst != NULL && dst->is_local) {
+		if (!passedup)
+			br_pass_frame_up(br, skb);
+		else
+			kfree_skb(skb);
+		br_fdb_put(dst);
+		goto out;
+	}
+
+	if (dst != NULL) {
+		br_forward(dst->dst, skb);
+		br_fdb_put(dst);
+		goto out;
+	}
+
+	br_flood_forward(br, skb, 0);
+
+out:
+	read_unlock(&br->lock);
+	return 0;
+
+err:
+	read_unlock(&br->lock);
+err_nolock:
+	kfree_skb(skb);
+	return 0;
+}
+
+int br_handle_frame(struct sk_buff *skb)
+{
+	struct net_bridge *br;
+	unsigned char *dest;
+	struct net_bridge_port *p;
+
+	dest = skb->mac.ethernet->h_dest;
+
+	p = skb->dev->br_port;
+	if (p == NULL)
+		goto err_nolock;
+
+	br = p->br;
+	read_lock(&br->lock);
+	if (skb->dev->br_port == NULL)
+		goto err;
+
+	if (!(br->dev.flags & IFF_UP) ||
+	    p->state == BR_STATE_DISABLED)
+		goto err;
+
+	if (skb->mac.ethernet->h_source[0] & 1)
+		goto err;
+
+	if (p->state == BR_STATE_LEARNING ||
+	    p->state == BR_STATE_FORWARDING)
+		br_fdb_insert(br, p, skb->mac.ethernet->h_source, 0);
+
+	if (br->stp_enabled &&
+	    !memcmp(dest, bridge_ula, 5) &&
+	    !(dest[5] & 0xF0))
+		goto handle_special_frame;
+
+	if (p->state == BR_STATE_FORWARDING) {
+#if defined(CONFIG_BRIDGE_EBT_BROUTE) || \
+    defined(CONFIG_BRIDGE_EBT_BROUTE_MODULE)
+		if (broute_decision && broute_decision(NF_BR_BROUTING, &skb,
+		   skb->dev, NULL, NULL) == NF_DROP)
+			return -1;
+#endif
+		NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
+			br_handle_frame_finish);
+		read_unlock(&br->lock);
+		return 0;
+	}
+
+err:
+	read_unlock(&br->lock);
+err_nolock:
+	kfree_skb(skb);
+	return 0;
+
+handle_special_frame:
+	if (!dest[5]) {
+		br_stp_handle_bpdu(skb);
+		read_unlock(&br->lock);
+		return 0;
+	}
+
+	kfree_skb(skb);
+	read_unlock(&br->lock);
+	return 0;
+}