1 files changed, 95 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_nat.h b/include/net/netfilter/nf_nat.h
new file mode 100644
index 00000000..0346b007
--- /dev/null
+++ b/include/net/netfilter/nf_nat.h
@@ -0,0 +1,95 @@
+#ifndef _NF_NAT_H
+#define _NF_NAT_H
+#include <linux/netfilter_ipv4.h>
+#include <net/netfilter/nf_conntrack_tuple.h>
+
+#define NF_NAT_MAPPING_TYPE_MAX_NAMELEN 16
+
+enum nf_nat_manip_type {
+	IP_NAT_MANIP_SRC,
+	IP_NAT_MANIP_DST
+};
+
+/* SRC manip occurs POST_ROUTING or LOCAL_IN */
+#define HOOK2MANIP(hooknum) ((hooknum) != NF_INET_POST_ROUTING && \
+			     (hooknum) != NF_INET_LOCAL_IN)
+
+#define IP_NAT_RANGE_MAP_IPS 1
+#define IP_NAT_RANGE_PROTO_SPECIFIED 2
+#define IP_NAT_RANGE_PROTO_RANDOM 4
+#define IP_NAT_RANGE_PERSISTENT 8
+
+/* NAT sequence number modifications */
+struct nf_nat_seq {
+	/* position of the last TCP sequence number modification (if any) */
+	u_int32_t correction_pos;
+
+	/* sequence number offset before and after last modification */
+	int16_t offset_before, offset_after;
+};
+
+/* Single range specification. */
+struct nf_nat_range {
+	/* Set to OR of flags above. */
+	unsigned int flags;
+
+	/* Inclusive: network order. */
+	__be32 min_ip, max_ip;
+
+	/* Inclusive: network order */
+	union nf_conntrack_man_proto min, max;
+};
+
+/* For backwards compat: don't use in modern code. */
+struct nf_nat_multi_range_compat {
+	unsigned int rangesize; /* Must be 1. */
+
+	/* hangs off end. */
+	struct nf_nat_range range[1];
+};
+
+#include <linux/list.h>
+#include <linux/netfilter/nf_conntrack_pptp.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+
+/* per conntrack: nat application helper private data */
+union nf_conntrack_nat_help {
+	/* insert nat helper private data here */
+#if defined(CONFIG_NF_NAT_PPTP) || defined(CONFIG_NF_NAT_PPTP_MODULE)
+	struct nf_nat_pptp nat_pptp_info;
+#endif
+};
+
+struct nf_conn;
+
+/* The structure embedded in the conntrack structure. */
+struct nf_conn_nat {
+	struct hlist_node bysource;
+	struct nf_nat_seq seq[IP_CT_DIR_MAX];
+	struct nf_conn *ct;
+	union nf_conntrack_nat_help help;
+#if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
+    defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
+	int masq_index;
+#endif
+};
+
+/* Set up the info structure to map into this range. */
+extern unsigned int nf_nat_setup_info(struct nf_conn *ct,
+				      const struct nf_nat_range *range,
+				      enum nf_nat_manip_type maniptype);
+
+/* Is this tuple already taken? (not by us)*/
+extern int nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
+			     const struct nf_conn *ignored_conntrack);
+
+static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
+{
+#if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE)
+	return nf_ct_ext_find(ct, NF_CT_EXT_NAT);
+#else
+	return NULL;
+#endif
+}
+
+#endif