1 files changed, 72 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack_helper.h b/include/net/netfilter/nf_conntrack_helper.h
new file mode 100644
index 00000000..f1c1311a
--- /dev/null
+++ b/include/net/netfilter/nf_conntrack_helper.h
@@ -0,0 +1,72 @@
+/*
+ * connection tracking helpers.
+ *
+ * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
+ *	- generalize L3 protocol dependent part.
+ *
+ * Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h
+ */
+
+#ifndef _NF_CONNTRACK_HELPER_H
+#define _NF_CONNTRACK_HELPER_H
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+
+struct module;
+
+#define NF_CT_HELPER_NAME_LEN	16
+
+struct nf_conntrack_helper {
+	struct hlist_node hnode;	/* Internal use. */
+
+	const char *name;		/* name of the module */
+	struct module *me;		/* pointer to self */
+	const struct nf_conntrack_expect_policy *expect_policy;
+
+	/* Tuple of things we will help (compared against server response) */
+	struct nf_conntrack_tuple tuple;
+
+	/* Function to call when data passes; return verdict, or -1 to
+           invalidate. */
+	int (*help)(struct sk_buff *skb,
+		    unsigned int protoff,
+		    struct nf_conn *ct,
+		    enum ip_conntrack_info conntrackinfo);
+
+	void (*destroy)(struct nf_conn *ct);
+
+	int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
+	unsigned int expect_class_max;
+};
+
+extern struct nf_conntrack_helper *
+__nf_conntrack_helper_find(const char *name, u16 l3num, u8 protonum);
+
+extern struct nf_conntrack_helper *
+nf_conntrack_helper_try_module_get(const char *name, u16 l3num, u8 protonum);
+
+extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
+extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
+
+extern struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);
+
+extern int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
+				     gfp_t flags);
+
+extern void nf_ct_helper_destroy(struct nf_conn *ct);
+
+static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
+{
+	return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
+}
+
+extern int nf_conntrack_helper_init(void);
+extern void nf_conntrack_helper_fini(void);
+
+extern int nf_conntrack_broadcast_help(struct sk_buff *skb,
+				       unsigned int protoff,
+				       struct nf_conn *ct,
+				       enum ip_conntrack_info ctinfo,
+				       unsigned int timeout);
+
+#endif /*_NF_CONNTRACK_HELPER_H*/