1 files changed, 79 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_nat.h b/include/net/netfilter/nf_nat.h
new file mode 100644
index 000000000..344b1ab19
--- /dev/null
+++ b/include/net/netfilter/nf_nat.h
@@ -0,0 +1,79 @@
+#ifndef _NF_NAT_H
+#define _NF_NAT_H
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter/nf_nat.h>
+#include <net/netfilter/nf_conntrack_tuple.h>
+
+enum nf_nat_manip_type {
+	NF_NAT_MANIP_SRC,
+	NF_NAT_MANIP_DST
+};
+
+/* SRC manip occurs POST_ROUTING or LOCAL_IN */
+#define HOOK2MANIP(hooknum) ((hooknum) != NF_INET_POST_ROUTING && \
+			     (hooknum) != NF_INET_LOCAL_IN)
+
+#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_conn *ct;
+	union nf_conntrack_nat_help help;
+#if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV4) || \
+    IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV6)
+	int masq_index;
+#endif
+};
+
+/* Set up the info structure to map into this range. */
+unsigned int nf_nat_setup_info(struct nf_conn *ct,
+			       const struct nf_nat_range *range,
+			       enum nf_nat_manip_type maniptype);
+
+extern unsigned int nf_nat_alloc_null_binding(struct nf_conn *ct,
+					      unsigned int hooknum);
+
+struct nf_conn_nat *nf_ct_nat_ext_add(struct nf_conn *ct);
+
+/* Is this tuple already taken? (not by us)*/
+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
+}
+
+static inline bool nf_nat_oif_changed(unsigned int hooknum,
+				      enum ip_conntrack_info ctinfo,
+				      struct nf_conn_nat *nat,
+				      const struct net_device *out)
+{
+#if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV4) || \
+    IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV6)
+	return nat->masq_index && hooknum == NF_INET_POST_ROUTING &&
+	       CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL &&
+	       nat->masq_index != out->ifindex;
+#else
+	return false;
+#endif
+}
+
+#endif