1 files changed, 79 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack_extend.h b/include/net/netfilter/nf_conntrack_extend.h
new file mode 100644
index 000000000..0b247248b
--- /dev/null
+++ b/include/net/netfilter/nf_conntrack_extend.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_CONNTRACK_EXTEND_H
+#define _NF_CONNTRACK_EXTEND_H
+
+#include <linux/slab.h>
+
+#include <net/netfilter/nf_conntrack.h>
+
+enum nf_ct_ext_id {
+	NF_CT_EXT_HELPER,
+#if IS_ENABLED(CONFIG_NF_NAT)
+	NF_CT_EXT_NAT,
+#endif
+	NF_CT_EXT_SEQADJ,
+	NF_CT_EXT_ACCT,
+#ifdef CONFIG_NF_CONNTRACK_EVENTS
+	NF_CT_EXT_ECACHE,
+#endif
+#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
+	NF_CT_EXT_TSTAMP,
+#endif
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+	NF_CT_EXT_TIMEOUT,
+#endif
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+	NF_CT_EXT_LABELS,
+#endif
+#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
+	NF_CT_EXT_SYNPROXY,
+#endif
+#if IS_ENABLED(CONFIG_NET_ACT_CT)
+	NF_CT_EXT_ACT_CT,
+#endif
+	NF_CT_EXT_NUM,
+};
+
+/* Extensions: optional stuff which isn't permanently in struct. */
+struct nf_ct_ext {
+	u8 offset[NF_CT_EXT_NUM];
+	u8 len;
+	unsigned int gen_id;
+	char data[] __aligned(8);
+};
+
+static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id)
+{
+	return !!ext->offset[id];
+}
+
+static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
+{
+	return (ct->ext && __nf_ct_ext_exist(ct->ext, id));
+}
+
+void *__nf_ct_ext_find(const struct nf_ct_ext *ext, u8 id);
+
+static inline void *nf_ct_ext_find(const struct nf_conn *ct, u8 id)
+{
+	struct nf_ct_ext *ext = ct->ext;
+
+	if (!ext || !__nf_ct_ext_exist(ext, id))
+		return NULL;
+
+	if (unlikely(ext->gen_id))
+		return __nf_ct_ext_find(ext, id);
+
+	return (void *)ct->ext + ct->ext->offset[id];
+}
+
+/* Add this type, returns pointer to data or NULL. */
+void *nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp);
+
+/* ext genid.  if ext->id != ext_genid, extensions cannot be used
+ * anymore unless conntrack has CONFIRMED bit set.
+ */
+extern atomic_t nf_conntrack_ext_genid;
+void nf_ct_ext_bump_genid(void);
+
+#endif /* _NF_CONNTRACK_EXTEND_H */