//       fallback: chain
				leaf := NewSourceIP()
				leaf.Map["1.2.3.4"] = ToChain("chain")

				inner := NewDestinationIP()
				inner.OnNoMatch = ToMatcher(leaf.Matcher)

				root := NewDestinationPort()
				root.OnNoMatch = ToMatcher(inner.Matcher)
				return root
			},
			want: func() *matcher.Matcher {
				// src port
				// 15001: chain
				want := NewSourceIP()
				want.Map["1.2.3.4"] = ToChain("chain")

						Map: m,
					},
				},
			},
		},
		OnNoMatch: nil,
	}
	return Mapper{Matcher: match, Map: m}
}

func NewDestinationIP() Mapper {
	return newMapper(DestinationIP)
}

func NewSourceIP() Mapper {
	return newMapper(SourceIP)
}

func NewDestinationPort() Mapper {
	return newMapper(DestinationPort)
}

type ProtocolMatch struct {
	TCP, HTTP *matcher.Matcher_OnMatch
}