diff --git a/src/ipset.rs b/src/ipset.rs
index bd9f75f..9d72c7d 100644
--- a/src/ipset.rs
+++ b/src/ipset.rs
@@ -4,6 +4,38 @@ use std::process::Command;
 
 const CMD_IPSET: &str = "ipset";
 
+// TODO
+// list names
+// list ipsetname
+// add
+// del
+
+struct IpSet {
+    name: String,
+}
+
+impl IpSet {
+    pub fn list_names() -> Vec<String> {
+        vec![]
+    }
+
+    pub fn list(&self) -> Vec<String> {
+        vec![]
+    }
+
+    pub fn add(&self, ip: &str) -> () {}
+
+    pub fn del(&self, ip: &str) -> () {}
+}
+
+fn list_names() {}
+
+fn list_ipset(ipset_name: &str) {}
+
+fn add_ipset(ipset_name: &str, ip: &str) {}
+
+fn del_ipset(ipset_name: &str, ip: &str) {}
+
 fn execute_ipset<I, S>(args: I) -> XResult<(Vec<u8>, Vec<u8>)>
 where
     I: IntoIterator<Item = S>,