seitan: action for the call

Perform the action action with the context. The action call executes a
syscall in the given namespaces or in caller context if non is
specified.

Signed-off-by: Alice Frosi <afrosi@redhat.com>

1 files changed, 94 insertions, 0 deletions

diff --git a/gluten.h b/gluten.h
new file mode 100644
index 0000000..b20cab6
--- /dev/null
+++ b/gluten.h
@@ -0,0 +1,94 @@
+#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 act_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 act_context {
+	struct ns_spec ns[sizeof(enum ns_type)];
+};
+
+enum action_type {
+	A_CALL,
+	A_BLOCK,
+	A_CONT,
+	A_INJECT,
+	A_INJECT_A,
+};
+
+struct act_call {
+	long nr;
+	void *args[6];
+	struct act_context context;
+};
+
+struct act_block {
+	int32_t error;
+};
+
+struct act_continue {
+	bool cont;
+};
+
+struct act_return {
+	int64_t value;
+};
+
+struct act_inject {
+	uint32_t newfd;
+	uint32_t old;
+};
+
+struct act_inject_a {
+	uint32_t newfd;
+	uint32_t old;
+	int64_t value;
+};
+
+struct action {
+	enum action_type type;
+	union {
+		struct act_call call;
+		struct act_block block;
+		struct act_continue cont;
+		struct act_return ret;
+		struct act_inject inj;
+		struct act_inject_a inj_a;
+	};
+};
+#endif /* GLUTEN_H */