diff --git a/capability.go b/capability.go
new file mode 100644
index 000000000..ed84adc3a
--- /dev/null
+++ b/capability.go
@@ -0,0 +1,36 @@
+package core
+
+type Capability byte
+
+const (
+	TCPConnection = Capability(0x01)
+	UDPConnection = Capability(0x02)
+)
+
+type Capabilities interface {
+	HasCapability(cap Capability) bool
+	AddCapability(cap Capability)
+}
+
+type listCapabilities struct {
+	data []Capability
+}
+
+func NewCapabilites() Capabilities {
+	return &listCapabilities{
+		data: make([]Capability, 0, 16),
+	}
+}
+
+func (c *listCapabilities) HasCapability(cap Capability) bool {
+	for _, v := range c.data {
+		if v == cap {
+			return true
+		}
+	}
+	return false
+}
+
+func (c *listCapabilities) AddCapability(cap Capability) {
+	c.data = append(c.data, cap)
+}