1 files changed, 113 insertions, 0 deletions
diff --git a/include/linux/netfilter_bridge.h b/include/linux/netfilter_bridge.h
new file mode 100644
index 00000000..0ddd161f
--- /dev/null
+++ b/include/linux/netfilter_bridge.h
@@ -0,0 +1,113 @@
+#ifndef __LINUX_BRIDGE_NETFILTER_H
+#define __LINUX_BRIDGE_NETFILTER_H
+
+/* bridge-specific defines for netfilter. 
+ */
+
+#include <linux/netfilter.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <linux/if_pppox.h>
+
+/* Bridge Hooks */
+/* After promisc drops, checksum checks. */
+#define NF_BR_PRE_ROUTING	0
+/* If the packet is destined for this box. */
+#define NF_BR_LOCAL_IN		1
+/* If the packet is destined for another interface. */
+#define NF_BR_FORWARD		2
+/* Packets coming from a local process. */
+#define NF_BR_LOCAL_OUT		3
+/* Packets about to hit the wire. */
+#define NF_BR_POST_ROUTING	4
+/* Not really a hook, but used for the ebtables broute table */
+#define NF_BR_BROUTING		5
+#define NF_BR_NUMHOOKS		6
+
+#ifdef __KERNEL__
+
+enum nf_br_hook_priorities {
+	NF_BR_PRI_FIRST = INT_MIN,
+	NF_BR_PRI_NAT_DST_BRIDGED = -300,
+	NF_BR_PRI_FILTER_BRIDGED = -200,
+	NF_BR_PRI_BRNF = 0,
+	NF_BR_PRI_NAT_DST_OTHER = 100,
+	NF_BR_PRI_FILTER_OTHER = 200,
+	NF_BR_PRI_NAT_SRC = 300,
+	NF_BR_PRI_LAST = INT_MAX,
+};
+
+#ifdef CONFIG_BRIDGE_NETFILTER
+
+#define BRNF_PKT_TYPE			0x01
+#define BRNF_BRIDGED_DNAT		0x02
+#define BRNF_BRIDGED			0x04
+#define BRNF_NF_BRIDGE_PREROUTING	0x08
+#define BRNF_8021Q			0x10
+#define BRNF_PPPoE			0x20
+
+/* Only used in br_forward.c */
+extern int nf_bridge_copy_header(struct sk_buff *skb);
+static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
+{
+	if (skb->nf_bridge &&
+	    skb->nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))
+		return nf_bridge_copy_header(skb);
+  	return 0;
+}
+
+static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
+{
+	switch (skb->protocol) {
+	case __cpu_to_be16(ETH_P_8021Q):
+		return VLAN_HLEN;
+	case __cpu_to_be16(ETH_P_PPP_SES):
+		return PPPOE_SES_HLEN;
+	default:
+		return 0;
+	}
+}
+
+static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
+{
+	if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))
+		return PPPOE_SES_HLEN;
+	return 0;
+}
+
+extern int br_handle_frame_finish(struct sk_buff *skb);
+/* Only used in br_device.c */
+static inline int br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
+{
+	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
+
+	skb_pull(skb, ETH_HLEN);
+	nf_bridge->mask ^= BRNF_BRIDGED_DNAT;
+	skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN),
+				       skb->nf_bridge->data, ETH_HLEN-ETH_ALEN);
+	skb->dev = nf_bridge->physindev;
+	return br_handle_frame_finish(skb);
+}
+
+/* This is called by the IP fragmenting code and it ensures there is
+ * enough room for the encapsulating header (if there is one). */
+static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)
+{
+	if (skb->nf_bridge)
+		return nf_bridge_encap_header_len(skb);
+	return 0;
+}
+
+struct bridge_skb_cb {
+	union {
+		__be32 ipv4;
+	} daddr;
+};
+
+#else
+#define nf_bridge_maybe_copy_header(skb)	(0)
+#define nf_bridge_pad(skb)			(0)
+#endif /* CONFIG_BRIDGE_NETFILTER */
+
+#endif /* __KERNEL__ */
+#endif