1 files changed, 36 insertions, 0 deletions
diff --git a/flow.h b/flow.h
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--- /dev/null
+++ b/flow.h
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+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright Red Hat
+ * Author: David Gibson <david@gibson.dropbear.id.au>
+ *
+ * Tracking for logical "flows" of packets.
+ */
+#ifndef FLOW_H
+#define FLOW_H
+
+/**
+ * enum flow_type - Different types of packet flows we track
+ */
+enum flow_type {
+	/* Represents an invalid or unused flow */
+	FLOW_TYPE_NONE = 0,
+	/* A TCP connection between a socket and tap interface */
+	FLOW_TCP,
+	/* A TCP connection between a host socket and ns socket */
+	FLOW_TCP_SPLICE,
+
+	FLOW_NUM_TYPES,
+};
+
+extern const char *flow_type_str[];
+#define FLOW_TYPE(f)							\
+        ((f)->type < FLOW_NUM_TYPES ? flow_type_str[(f)->type] : "?")
+
+/**
+ * struct flow_common - Common fields for packet flows
+ * @type:	Type of packet flow
+ */
+struct flow_common {
+	uint8_t		type;
+};
+
+#endif /* FLOW_H */