diff --git a/common/environment/app.go b/common/environment/app.go
new file mode 100644
index 000000000..2b786febd
--- /dev/null
+++ b/common/environment/app.go
@@ -0,0 +1,22 @@
+package environment
+
+import (
+	"github.com/v2fly/v2ray-core/v4/features/extension"
+)
+
+type AppEnvironmentCapabilitySet interface {
+	BaseEnvironmentCapabilitySet
+	SystemNetworkCapabilitySet
+	InstanceNetworkCapabilitySet
+	FileSystemCapabilitySet
+
+	PersistentStorage() extension.ScopedPersistentStorage
+	TransientStorage() extension.ScopedTransientStorage
+}
+
+type AppEnvironment interface {
+	AppEnvironmentCapabilitySet
+
+	NarrowScope(key []byte) (AppEnvironment, error)
+	doNotImpl()
+}
diff --git a/common/environment/base.go b/common/environment/base.go
new file mode 100644
index 000000000..7c69e3d6b
--- /dev/null
+++ b/common/environment/base.go
@@ -0,0 +1,41 @@
+package environment
+
+import (
+	"github.com/v2fly/v2ray-core/v4/common/log"
+	"github.com/v2fly/v2ray-core/v4/common/platform/filesystem"
+	"github.com/v2fly/v2ray-core/v4/transport/internet"
+	"github.com/v2fly/v2ray-core/v4/transport/internet/tagged"
+)
+
+type BaseEnvironmentCapabilitySet interface {
+	FeaturesLookupCapabilitySet
+	LogCapabilitySet
+}
+
+type BaseEnvironment interface {
+	BaseEnvironmentCapabilitySet
+	doNotImpl()
+}
+
+type SystemNetworkCapabilitySet interface {
+	Dialer() internet.SystemDialer
+	Listener() internet.SystemListener
+}
+
+type InstanceNetworkCapabilitySet interface {
+	OutboundDialer() tagged.DialFunc
+}
+
+type FeaturesLookupCapabilitySet interface {
+	RequireFeatures(callback interface{}) error
+}
+
+type LogCapabilitySet interface {
+	RecordLog(msg log.Message)
+}
+
+type FileSystemCapabilitySet interface {
+	OpenFileForReadSeek() filesystem.FileSeekerFunc
+	OpenFileForRead() filesystem.FileReaderFunc
+	OpenFileForWrite() filesystem.FileWriterFunc
+}
diff --git a/common/environment/connection.go b/common/environment/connection.go
new file mode 100644
index 000000000..d0bddb5ef
--- /dev/null
+++ b/common/environment/connection.go
@@ -0,0 +1,17 @@
+package environment
+
+import "github.com/v2fly/v2ray-core/v4/common/log"
+
+type ConnectionCapabilitySet interface {
+	ConnectionLogCapabilitySet
+}
+
+type ConnectionEnvironment interface {
+	ConnectionCapabilitySet
+
+	doNotImpl()
+}
+
+type ConnectionLogCapabilitySet interface {
+	RecordConnectionLog(msg log.Message)
+}
diff --git a/common/environment/proxy.go b/common/environment/proxy.go
new file mode 100644
index 000000000..483cea332
--- /dev/null
+++ b/common/environment/proxy.go
@@ -0,0 +1,19 @@
+package environment
+
+import "github.com/v2fly/v2ray-core/v4/features/extension"
+
+type ProxyEnvironmentCapabilitySet interface {
+	BaseEnvironmentCapabilitySet
+	InstanceNetworkCapabilitySet
+
+	TransientStorage() extension.ScopedTransientStorage
+}
+
+type ProxyEnvironment interface {
+	ProxyEnvironmentCapabilitySet
+
+	NarrowScope(key []byte) (ProxyEnvironment, error)
+	NarrowScopeToTransport(key []byte) (TransportEnvironment, error)
+
+	doNotImpl()
+}
diff --git a/common/environment/transport.go b/common/environment/transport.go
new file mode 100644
index 000000000..180d9ff47
--- /dev/null
+++ b/common/environment/transport.go
@@ -0,0 +1,18 @@
+package environment
+
+import "github.com/v2fly/v2ray-core/v4/features/extension"
+
+type TransportEnvironmentCapacitySet interface {
+	BaseEnvironmentCapabilitySet
+	SystemNetworkCapabilitySet
+	InstanceNetworkCapabilitySet
+
+	TransientStorage() extension.ScopedTransientStorage
+}
+
+type TransportEnvironment interface {
+	TransportEnvironmentCapacitySet
+
+	NarrowScope(key []byte) (TransportEnvironment, error)
+	doNotImpl()
+}
diff --git a/features/extension/storage.go b/features/extension/storage.go
new file mode 100644
index 000000000..4435930ce
--- /dev/null
+++ b/features/extension/storage.go
@@ -0,0 +1,35 @@
+package extension
+
+import (
+	"context"
+	"github.com/v2fly/v2ray-core/v4/features"
+)
+
+type PersistentStorageEngine interface {
+	features.Feature
+
+	PersistentStorageEngine()
+	Put(ctx context.Context, key []byte, value []byte) error
+	Get(ctx context.Context, key []byte) ([]byte, error)
+	List(ctx context.Context, keyPrefix []byte) ([][]byte, error)
+}
+
+type ScopedPersistentStorage interface {
+	ScopedPersistentStorageEngine()
+
+	Put(ctx context.Context, key []byte, value []byte) error
+	Get(ctx context.Context, key []byte) ([]byte, error)
+	List(ctx context.Context, keyPrefix []byte) ([][]byte, error)
+
+	ClearIfCharacteristicMismatch(ctx context.Context, characteristic []byte) error
+	NarrowScope(ctx context.Context, key []byte) (ScopedPersistentStorage, error)
+}
+
+type ScopedTransientStorage interface {
+	ScopedTransientStorage()
+	Put(ctx context.Context, key []byte, value interface{}) error
+	Get(ctx context.Context, key []byte) (interface{}, error)
+	List(ctx context.Context, keyPrefix []byte) ([][]byte, error)
+	Clear(ctx context.Context)
+	NarrowScope(ctx context.Context, key []byte) (ScopedPersistentStorage, error)
+}
diff --git a/infra/conf/cfgcommon/session.go b/infra/conf/cfgcommon/session.go
index 283fe31f1..2fcf73882 100644
--- a/infra/conf/cfgcommon/session.go
+++ b/infra/conf/cfgcommon/session.go
@@ -2,7 +2,6 @@ package cfgcommon
 
 import (
 	"context"
-
 	"github.com/v2fly/v2ray-core/v4/common"
 	"github.com/v2fly/v2ray-core/v4/infra/conf/geodata"
 )
@@ -24,10 +23,20 @@ func (c *configureLoadingEnvironment) GetGeoLoader() geodata.Loader {
 	return c.geoLoader
 }
 
-type ConfigureLoadingEnvironment interface {
+func (c *configureLoadingEnvironment) doNotImpl() {}
+
+type ConfigureLoadingEnvironmentCapabilitySet interface {
 	GetGeoLoader() geodata.Loader
 }
 
+type ConfigureLoadingEnvironment interface {
+	ConfigureLoadingEnvironmentCapabilitySet
+	doNotImpl()
+
+	// TODO environment.BaseEnvironmentCapabilitySet
+	// TODO environment.FileSystemCapabilitySet
+}
+
 func NewConfigureLoadingContext(ctx context.Context) context.Context {
 	environment := &configureLoadingEnvironment{}
 	return context.WithValue(ctx, confContextKey, environment)
diff --git a/transport/internet/system_listener.go b/transport/internet/system_listener.go
index a13a36768..435cce421 100644
--- a/transport/internet/system_listener.go
+++ b/transport/internet/system_listener.go
@@ -102,3 +102,8 @@ func RegisterListenerController(controller func(network, address string, fd uint
 	effectiveListener.controllers = append(effectiveListener.controllers, controller)
 	return nil
 }
+
+type SystemListener interface {
+	Listen(ctx context.Context, addr net.Addr, sockopt *SocketConfig) (net.Listener, error)
+	ListenPacket(ctx context.Context, addr net.Addr, sockopt *SocketConfig) (net.PacketConn, error)
+}