1 files changed, 138 insertions, 0 deletions
diff --git a/common/gluten.h b/common/gluten.h
new file mode 100644
index 0000000..8370cf5
--- /dev/null
+++ b/common/gluten.h
@@ -0,0 +1,138 @@
+#ifndef GLUTEN_H
+#define GLUTEN_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define MAX_FD_INJECTED 10
+
+enum ns_spec_type {
+	NS_NONE,
+	NS_SPEC_TARGET,
+	NS_SPEC_PID,
+	NS_SPEC_PATH,
+};
+
+struct ns_spec {
+	enum ns_spec_type type;
+	union {
+		pid_t pid;
+		char *path;
+	};
+};
+
+/*
+ * enum ns_type - Type of namespaces
+ */
+enum ns_type {
+	NS_CGROUP,
+	NS_IPC,
+	NS_NET,
+	NS_MOUNT,
+	NS_PID,
+	NS_TIME,
+	NS_USER,
+	NS_UTS,
+};
+
+/*
+ * struct op_context - Description of the context where the call needs to be executed
+ * @ns:	Descrption of the each namespace where the call needs to be executed
+ */
+struct op_context {
+	struct ns_spec ns[sizeof(enum ns_type)];
+};
+
+enum op_type {
+	OP_CALL,
+	OP_BLOCK,
+	OP_CONT,
+	OP_INJECT,
+	OP_INJECT_A,
+	OP_RETURN,
+	OP_COPY_ARGS,
+	OP_END,
+	OP_CMP,
+	OP_RESOLVEDFD,
+};
+
+enum value_type {
+	IMMEDIATE,
+	REFERENCE,
+};
+
+struct op_call {
+	long nr;
+	bool has_ret;
+	void *args[6];
+	struct op_context context;
+	uint16_t ret_off;
+};
+
+struct op_block {
+	int32_t error;
+};
+
+struct op_continue {
+	bool cont;
+};
+
+struct op_return {
+	enum value_type type;
+	union {
+		int64_t value;
+		uint16_t value_off;
+	};
+};
+
+struct fd_type {
+	enum value_type type;
+	union {
+		uint32_t fd;
+		uint16_t fd_off;
+	};
+};
+
+struct op_inject {
+	struct fd_type newfd;
+	struct fd_type oldfd;
+};
+
+struct copy_arg {
+	uint16_t args_off;
+	enum value_type type;
+	size_t size;
+};
+
+struct op_copy_args {
+	struct copy_arg args[6];
+};
+
+struct op_cmp {
+	uint16_t s1_off;
+	uint16_t s2_off;
+	size_t size;
+	unsigned int jmp;
+};
+
+struct op_resolvedfd {
+	uint16_t fd_off;
+	uint16_t path_off;
+	size_t path_size;
+	unsigned int jmp;
+};
+
+struct op {
+	enum op_type type;
+	union {
+		struct op_call call;
+		struct op_block block;
+		struct op_continue cont;
+		struct op_return ret;
+		struct op_inject inj;
+		struct op_copy_args copy;
+		struct op_cmp cmp;
+		struct op_resolvedfd resfd;
+	};
+};
+#endif /* GLUTEN_H */