diff --git a/src/proto/connection.rs b/src/proto/connection.rs
index 28232cb..f3128bb 100644
--- a/src/proto/connection.rs
+++ b/src/proto/connection.rs
@@ -3,8 +3,6 @@ use client::Client;
 use error;
 use frame::{self, StreamId};
 use proto::*;
-use proto::ping_pong::{ControlPing, PingPayload};
-use proto::settings::ControlSettings;
 use server::Server;
 
 use bytes::{Bytes, IntoBuf};
diff --git a/src/proto/flow_control.rs b/src/proto/flow_control.rs
index 9128e57..726c73b 100644
--- a/src/proto/flow_control.rs
+++ b/src/proto/flow_control.rs
@@ -4,20 +4,6 @@ use proto::*;
 
 use std::collections::VecDeque;
 
-/// Exposes flow control states to "upper" layers of the transport (i.e. above
-/// FlowControl).
-pub trait ControlFlow {
-    /// Polls for the next window update from the remote.
-    fn poll_window_update(&mut self) -> Poll<WindowUpdate, ConnectionError>;
-
-    /// Increases the local receive capacity of a stream.
-    ///
-    /// This may cause a window update to be sent to the remote.
-    ///
-    /// Fails if the given stream is not active.
-    fn expand_window(&mut self, id: StreamId, incr: WindowSize) -> Result<(), ConnectionError>;
-}
-
 #[derive(Debug)]
 pub struct FlowControl<T>  {
     inner: T,
@@ -345,100 +331,5 @@ impl<T> ApplySettings for FlowControl<T>
     }
 }
 
-/// Proxy.
-impl<T: ControlStreams> ControlStreams for FlowControl<T> {
-    fn local_valid_id(id: StreamId) -> bool {
-        T::local_valid_id(id)
-    }
-
-    fn remote_valid_id(id: StreamId) -> bool {
-        T::remote_valid_id(id)
-    }
-
-    fn local_can_open() -> bool {
-        T::local_can_open()
-    }
-
-    fn local_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.local_open(id, sz)
-    }
-
-    fn local_open_recv_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.local_open_recv_half(id, sz)
-    }
-
-    fn remote_open_send_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.remote_open_send_half(id, sz)
-    }
-
-    fn remote_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.remote_open(id, sz)
-    }
-
-    fn close_send_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
-        self.inner.close_send_half(id)
-    }
-
-    fn close_recv_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
-        self.inner.close_recv_half(id)
-    }
-
-    fn reset_stream(&mut self, id: StreamId, cause: Reason) {
-        self.inner.reset_stream(id, cause)
-    }
-
-    fn get_reset(&self, id: StreamId) -> Option<Reason> {
-        self.inner.get_reset(id)
-    }
-
-    fn is_local_active(&self, id: StreamId) -> bool {
-        self.inner.is_local_active(id)
-    }
-
-    fn is_remote_active(&self, id: StreamId) -> bool {
-        self.inner.is_remote_active(id)
-    }
-
-    fn local_active_len(&self) -> usize {
-        self.inner.local_active_len()
-    }
-
-    fn remote_active_len(&self) -> usize {
-        self.inner.remote_active_len()
-    }
-
-    fn update_inital_recv_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
-        self.inner.update_inital_recv_window_size(old_sz, new_sz)
-    }
-
-    fn update_inital_send_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
-        self.inner.update_inital_send_window_size(old_sz, new_sz)
-    }
-
-    fn recv_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
-        self.inner.recv_flow_controller(id)
-    }
-
-    fn send_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
-        self.inner.send_flow_controller(id)
-    }
-
-    fn is_send_open(&mut self, id: StreamId) -> bool {
-        self.inner.is_send_open(id)
-    }
-
-    fn is_recv_open(&mut self, id: StreamId) -> bool  {
-        self.inner.is_recv_open(id)
-    }
-}
-
-/// Proxy.
-impl<T: ControlPing> ControlPing for FlowControl<T> {
-    fn start_ping(&mut self, body: PingPayload) -> StartSend<PingPayload, ConnectionError> {
-        self.inner.start_ping(body)
-    }
-
-    fn take_pong(&mut self) -> Option<PingPayload> {
-        self.inner.take_pong()
-    }
-}
+proxy_control_streams!(FlowControl);
+proxy_control_ping!(FlowControl);
diff --git a/src/proto/ifaces.rs b/src/proto/ifaces.rs
new file mode 100644
index 0000000..3189322
--- /dev/null
+++ b/src/proto/ifaces.rs
@@ -0,0 +1,302 @@
+use ConnectionError;
+use frame::SettingSet;
+use proto::*;
+
+/// Exposes settings to "upper" layers of the transport (i.e. from Settings up to---and
+/// above---Connection).
+pub trait ControlSettings {
+    fn update_local_settings(&mut self, set: SettingSet) -> Result<(), ConnectionError>;
+
+    fn remote_push_enabled(&self) -> Option<bool>;
+    fn remote_max_concurrent_streams(&self) -> Option<u32>;
+    fn remote_initial_window_size(&self) -> WindowSize;
+}
+
+// macro_rules! proxy_control_settings {
+//     ($outer:ident) => (
+//         impl<T: ControlSettings> ControlSettings for $outer<T> {
+//             fn update_local_settings(&mut self, set: SettingSet) -> Result<(), ConnectionError> {
+//                 self.inner.update_local_settings(set)
+//             }
+//
+//             fn remote_push_enabled(&self) -> Option<bool> {
+//                 self.inner.remote_push_enabled(set)
+//             }
+//
+//             fn remote_max_concurrent_streams(&self) -> Option<u32> {
+//                 self.inner.remote_max_concurrent_streams(set)
+//             }
+//
+//             fn remote_initial_window_size(&self) -> WindowSize {
+//                 self.inner.remote_initial_window_size(set)
+//             }
+//         }
+//     )
+// }
+
+/// Allows settings updates to be pushed "down" the transport (i.e. from Settings down to
+/// FramedWrite).
+pub trait ApplySettings {
+    fn apply_local_settings(&mut self, set: &SettingSet) -> Result<(), ConnectionError>;
+    fn apply_remote_settings(&mut self, set: &SettingSet) -> Result<(), ConnectionError>;
+}
+
+macro_rules! proxy_apply_settings {
+    ($outer:ident) => (
+        impl<T: ApplySettings> ApplySettings for $outer<T> {
+            fn apply_local_settings(&mut self, set: &frame::SettingSet) -> Result<(), ConnectionError> {
+                self.inner.apply_local_settings(set)
+            }
+
+            fn apply_remote_settings(&mut self, set: &frame::SettingSet) -> Result<(), ConnectionError> {
+                self.inner.apply_remote_settings(set)
+            }
+        }
+    )
+}
+
+/// Exposes flow control states to "upper" layers of the transport (i.e. above
+/// FlowControl).
+pub trait ControlFlow {
+    /// Polls for the next window update from the remote.
+    fn poll_window_update(&mut self) -> Poll<WindowUpdate, ConnectionError>;
+
+    /// Increases the local receive capacity of a stream.
+    ///
+    /// This may cause a window update to be sent to the remote.
+    ///
+    /// Fails if the given stream is not active.
+    fn expand_window(&mut self, id: StreamId, incr: WindowSize) -> Result<(), ConnectionError>;
+}
+
+macro_rules! proxy_control_flow {
+    ($outer:ident) => (
+        impl<T: ControlFlow> ControlFlow for $outer<T> {
+            fn poll_window_update(&mut self) -> Poll<WindowUpdate, ConnectionError> {
+                self.inner.poll_window_update()
+            }
+
+            fn expand_window(&mut self, id: StreamId, incr: WindowSize) -> Result<(), ConnectionError> {
+                self.inner.expand_window(id, incr)
+            }
+        }
+    )
+}
+
+/// Exposes stream states to "upper" layers of the transport (i.e. from StreamTracker up
+/// to Connection).
+pub trait ControlStreams {
+    /// Determines whether the given stream could theoretically be opened by the local
+    /// side of this connection.
+    fn local_valid_id(id: StreamId) -> bool;
+
+    /// Determines whether the given stream could theoretically be opened by the remote
+    /// side of this connection.
+    fn remote_valid_id(id: StreamId) -> bool;
+
+    /// Indicates whether this local endpoint may open streams (with HEADERS).
+    ///
+    /// Implies that this endpoint is a client.
+    fn local_can_open() -> bool;
+
+    /// Indicates whether this remote endpoint may open streams (with HEADERS).
+    ///
+    /// Implies that this endpoint is a server.
+    fn remote_can_open() -> bool {
+        !Self::local_can_open()
+    }
+
+    /// Creates a new stream in the OPEN state from the local side (i.e. as a Client).
+    ///
+    /// Must only be called when local_can_open returns true.
+    fn local_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError>;
+
+    /// Create a new stream in the OPEN state from the remote side (i.e. as a Server).
+    ///
+    /// Must only be called when remote_can_open returns true.
+    fn remote_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError>;
+
+    /// Prepare the receive side of a local stream to receive data from the remote.
+    ///
+    /// Typically called when a client receives a response header.
+    fn local_open_recv_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError>;
+
+    /// Prepare the send side of a remote stream to receive data from the local endpoint.
+    ///
+    /// Typically called when a server sends a response header.
+    fn remote_open_send_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError>;
+
+    // TODO push promise
+    // fn local_reserve(&mut self, id: StreamId) -> Result<(), ConnectionError>;
+    // fn remote_reserve(&mut self, id: StreamId) -> Result<(), ConnectionError>;
+
+    /// Closes the send half of a stream.
+    ///
+    /// Fails with a ProtocolError if send half of the stream was not open.
+    fn close_send_half(&mut self, id: StreamId) -> Result<(), ConnectionError>;
+
+    /// Closes the recv half of a stream.
+    ///
+    /// Fails with a ProtocolError if recv half of the stream was not open.
+    fn close_recv_half(&mut self, id: StreamId) -> Result<(), ConnectionError>;
+
+    /// Resets the given stream.
+    ///
+    /// If the stream was already reset, the stored cause is updated.
+    fn reset_stream(&mut self, id: StreamId, cause: Reason);
+
+    /// Get the reason the stream was reset, if it was reset.
+    fn get_reset(&self, id: StreamId) -> Option<Reason>;
+
+    /// Returns true if the given stream was opened by the local peer and is not yet
+    /// closed.
+    fn is_local_active(&self, id: StreamId) -> bool;
+
+    /// Returns true if the given stream was opened by the remote peer and is not yet
+    /// closed.
+    fn is_remote_active(&self, id: StreamId) -> bool;
+
+    /// Returns true if the given stream was opened and is not yet closed.
+    fn is_active(&self, id: StreamId) -> bool {
+        if Self::local_valid_id(id) {
+            self.is_local_active(id)
+        } else {
+            self.is_remote_active(id)
+        }
+    }
+
+    /// Returns the number of open streams initiated by the local peer.
+    fn local_active_len(&self) -> usize;
+
+    /// Returns the number of open streams initiated by the remote peer.
+    fn remote_active_len(&self) -> usize;
+
+    /// Returns true iff the recv half of the given stream is open.
+    fn is_recv_open(&mut self, id: StreamId) -> bool;
+
+    /// Returns true iff the send half of the given stream is open.
+    fn is_send_open(&mut self, id: StreamId) -> bool;
+
+    /// If the given stream ID is active and able to recv data, get its mutable recv flow
+    /// control state.
+    fn recv_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState>;
+
+    /// If the given stream ID is active and able to send data, get its mutable send flow
+    /// control state.
+    fn send_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState>;
+
+    /// Updates the initial window size for the local peer.
+    fn update_inital_recv_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize);
+
+    /// Updates the initial window size for the remote peer.
+    fn update_inital_send_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize);
+}
+
+macro_rules! proxy_control_streams {
+    ($outer:ident) => (
+        impl<T: ControlStreams> ControlStreams for $outer<T> {
+            fn local_valid_id(id: StreamId) -> bool {
+                T::local_valid_id(id)
+            }
+
+            fn remote_valid_id(id: StreamId) -> bool {
+                T::remote_valid_id(id)
+            }
+
+            fn local_can_open() -> bool {
+                T::local_can_open()
+            }
+
+            fn local_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
+                self.inner.local_open(id, sz)
+            }
+
+            fn remote_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
+                self.inner.remote_open(id, sz)
+            }
+
+            fn local_open_recv_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
+                self.inner.local_open_recv_half(id, sz)
+            }
+
+            fn remote_open_send_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
+                self.inner.remote_open_send_half(id, sz)
+            }
+
+            fn close_send_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
+                self.inner.close_send_half(id)
+            }
+
+            fn close_recv_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
+                self.inner.close_recv_half(id)
+            }
+
+            fn reset_stream(&mut self, id: StreamId, cause: Reason) {
+                self.inner.reset_stream(id, cause)
+            }
+
+            fn get_reset(&self, id: StreamId) -> Option<Reason> {
+                self.inner.get_reset(id)
+            }
+
+            fn is_local_active(&self, id: StreamId) -> bool {
+                self.inner.is_local_active(id)
+            }
+
+            fn is_remote_active(&self, id: StreamId) -> bool {
+                self.inner.is_remote_active(id)
+            }
+
+            fn local_active_len(&self) -> usize {
+                self.inner.local_active_len()
+            }
+
+            fn remote_active_len(&self) -> usize {
+                self.inner.remote_active_len()
+            }
+
+            fn update_inital_recv_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
+                self.inner.update_inital_recv_window_size(old_sz, new_sz)
+            }
+
+            fn update_inital_send_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
+                self.inner.update_inital_send_window_size(old_sz, new_sz)
+            }
+
+            fn recv_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
+                self.inner.recv_flow_controller(id)
+            }
+
+            fn send_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
+                self.inner.send_flow_controller(id)
+            }
+
+            fn is_send_open(&mut self, id: StreamId) -> bool {
+                self.inner.is_send_open(id)
+            }
+
+            fn is_recv_open(&mut self, id: StreamId) -> bool  {
+                self.inner.is_recv_open(id)
+            }
+        }
+    )
+}
+
+pub trait ControlPing {
+    fn start_ping(&mut self, body: PingPayload) -> StartSend<PingPayload, ConnectionError>;
+    fn take_pong(&mut self) -> Option<PingPayload>;
+}
+
+macro_rules! proxy_control_ping {
+    ($outer:ident) => (
+        impl<T: ControlPing> ControlPing for $outer<T> {
+            fn start_ping(&mut self, body: PingPayload) -> StartSend<PingPayload, ConnectionError> {
+                self.inner.start_ping(body)
+            }
+
+            fn take_pong(&mut self) -> Option<PingPayload> {
+                self.inner.take_pong()
+            }
+        }
+    )
+}
diff --git a/src/proto/mod.rs b/src/proto/mod.rs
index 53e2ef4..1fe7cf3 100644
--- a/src/proto/mod.rs
+++ b/src/proto/mod.rs
@@ -7,6 +7,10 @@ use futures::*;
 use tokio_io::{AsyncRead, AsyncWrite};
 use tokio_io::codec::length_delimited;
 
+#[macro_use]
+mod ifaces;
+use self::ifaces::*;
+
 mod connection;
 mod flow_control;
 mod flow_control_state;
@@ -24,18 +28,18 @@ mod stream_store;
 
 pub use self::connection::Connection;
 
-use self::flow_control::{ControlFlow, FlowControl};
+use self::flow_control::{FlowControl};
 use self::flow_control_state::{FlowControlState};
 use self::framed_read::FramedRead;
 use self::framed_write::FramedWrite;
-use self::ping_pong::{ControlPing, PingPayload, PingPong};
+use self::ping_pong::{PingPong};
 use self::ready::ReadySink;
-use self::settings::{ApplySettings, ControlSettings, Settings};
+use self::settings::Settings;
 use self::stream_recv_close::StreamRecvClose;
 use self::stream_recv_open::StreamRecvOpen;
 use self::stream_send_close::StreamSendClose;
 use self::stream_send_open::StreamSendOpen;
-use self::stream_store::{ControlStreams, StreamStore};
+use self::stream_store::StreamStore;
 
 /// Represents the internals of an HTTP/2 connection.
 ///
@@ -140,6 +144,8 @@ type Codec<T, B> =
     FramedRead<
         FramedWrite<T, B>>;
 
+pub type PingPayload = [u8; 8];
+
 pub type WindowSize = u32;
 
 #[derive(Debug, Copy, Clone)]
diff --git a/src/proto/ping_pong.rs b/src/proto/ping_pong.rs
index ece90ff..f67642f 100644
--- a/src/proto/ping_pong.rs
+++ b/src/proto/ping_pong.rs
@@ -1,15 +1,6 @@
 use ConnectionError;
 use frame::{Frame, Ping, SettingSet};
-use proto::{ApplySettings, ReadySink};
-
-use futures::*;
-
-pub type PingPayload = [u8; 8];
-
-pub trait ControlPing {
-    fn start_ping(&mut self, body: PingPayload) -> StartSend<PingPayload, ConnectionError>;
-    fn take_pong(&mut self) -> Option<PingPayload>;
-}
+use proto::*;
 
 /// Acknowledges ping requests from the remote.
 #[derive(Debug)]
diff --git a/src/proto/settings.rs b/src/proto/settings.rs
index 66cc98f..f9e8d07 100644
--- a/src/proto/settings.rs
+++ b/src/proto/settings.rs
@@ -7,23 +7,6 @@ use bytes::BufMut;
 
 use std::io;
 
-/// Exposes settings to "upper" layers of the transport (i.e. from Settings up to---and
-/// above---Connection).
-pub trait ControlSettings {
-    fn update_local_settings(&mut self, set: frame::SettingSet) -> Result<(), ConnectionError>;
-
-    fn remote_push_enabled(&self) -> Option<bool>;
-    fn remote_max_concurrent_streams(&self) -> Option<u32>;
-    fn remote_initial_window_size(&self) -> WindowSize;
-}
-
-/// Allows settings updates to be pushed "down" the transport (i.e. from Settings down to
-/// FramedWrite).
-pub trait ApplySettings {
-    fn apply_local_settings(&mut self, set: &frame::SettingSet) -> Result<(), ConnectionError>;
-    fn apply_remote_settings(&mut self, set: &frame::SettingSet) -> Result<(), ConnectionError>;
-}
-
 #[derive(Debug)]
 pub struct Settings<T> {
     // Upstream transport
@@ -241,12 +224,4 @@ impl<T: ControlFlow> ControlFlow for Settings<T> {
     }
 }
 
-impl<T: ControlPing> ControlPing for Settings<T> {
-    fn start_ping(&mut self, body: PingPayload) -> StartSend<PingPayload, ConnectionError> {
-        self.inner.start_ping(body)
-    }
-
-    fn take_pong(&mut self) -> Option<PingPayload> {
-        self.inner.take_pong()
-    }
-}
+proxy_control_ping!(Settings);
diff --git a/src/proto/stream_recv_close.rs b/src/proto/stream_recv_close.rs
index 95baae6..41839c8 100644
--- a/src/proto/stream_recv_close.rs
+++ b/src/proto/stream_recv_close.rs
@@ -79,122 +79,7 @@ impl<T, U> ReadySink for StreamRecvClose<T>
     }
 }
 
-// Proxy.
-impl<T: ControlStreams> ControlStreams for StreamRecvClose<T> {
-    fn local_valid_id(id: StreamId) -> bool {
-        T::local_valid_id(id)
-    }
-
-    fn remote_valid_id(id: StreamId) -> bool {
-        T::remote_valid_id(id)
-    }
-
-    fn local_can_open() -> bool {
-        T::local_can_open()
-    }
-
-    fn local_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.local_open(id, sz)
-    }
-
-    fn remote_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.remote_open(id, sz)
-    }
-
-    fn local_open_recv_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.local_open_recv_half(id, sz)
-    }
-
-    fn remote_open_send_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.remote_open_send_half(id, sz)
-    }
-
-    fn close_send_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
-        self.inner.close_send_half(id)
-    }
-
-    fn close_recv_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
-        self.inner.close_recv_half(id)
-    }
-
-    fn reset_stream(&mut self, id: StreamId, cause: Reason) {
-        self.inner.reset_stream(id, cause)
-    }
-
-    fn get_reset(&self, id: StreamId) -> Option<Reason> {
-        self.inner.get_reset(id)
-    }
-
-    fn is_local_active(&self, id: StreamId) -> bool {
-        self.inner.is_local_active(id)
-    }
-
-    fn is_remote_active(&self, id: StreamId) -> bool {
-        self.inner.is_remote_active(id)
-    }
-
-    fn local_active_len(&self) -> usize {
-        self.inner.local_active_len()
-    }
-
-    fn remote_active_len(&self) -> usize {
-        self.inner.remote_active_len()
-    }
-
-    fn update_inital_recv_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
-        self.inner.update_inital_recv_window_size(old_sz, new_sz)
-    }
-
-    fn update_inital_send_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
-        self.inner.update_inital_send_window_size(old_sz, new_sz)
-    }
-
-    fn recv_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
-        self.inner.recv_flow_controller(id)
-    }
-
-    fn send_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
-        self.inner.send_flow_controller(id)
-    }
-
-    fn is_send_open(&mut self, id: StreamId) -> bool {
-        self.inner.is_send_open(id)
-    }
-
-    fn is_recv_open(&mut self, id: StreamId) -> bool  {
-        self.inner.is_recv_open(id)
-    }
-}
-
-// Proxy.
-impl<T: ApplySettings> ApplySettings for StreamRecvClose<T> {
-    fn apply_local_settings(&mut self, set: &frame::SettingSet) -> Result<(), ConnectionError> {
-        self.inner.apply_local_settings(set)
-    }
-
-    fn apply_remote_settings(&mut self, set: &frame::SettingSet) -> Result<(), ConnectionError> {
-        self.inner.apply_remote_settings(set)
-    }
-}
-
-// Proxy.
-impl<T: ControlFlow> ControlFlow for StreamRecvClose<T> {
-    fn poll_window_update(&mut self) -> Poll<WindowUpdate, ConnectionError> {
-        self.inner.poll_window_update()
-    }
-
-    fn expand_window(&mut self, id: StreamId, incr: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.expand_window(id, incr)
-    }
-}
-
-// Proxy.
-impl<T: ControlPing> ControlPing for StreamRecvClose<T> {
-    fn start_ping(&mut self, body: PingPayload) -> StartSend<PingPayload, ConnectionError> {
-        self.inner.start_ping(body)
-    }
-
-    fn take_pong(&mut self) -> Option<PingPayload> {
-        self.inner.take_pong()
-    }
-}
+proxy_apply_settings!(StreamRecvClose);
+proxy_control_flow!(StreamRecvClose);
+proxy_control_streams!(StreamRecvClose);
+proxy_control_ping!(StreamRecvClose);
diff --git a/src/proto/stream_recv_open.rs b/src/proto/stream_recv_open.rs
index 74f70d7..dbc6da1 100644
--- a/src/proto/stream_recv_open.rs
+++ b/src/proto/stream_recv_open.rs
@@ -212,100 +212,6 @@ impl<T, U> ReadySink for StreamRecvOpen<T>
     }
 }
 
-/// Proxy.
-impl<T: ControlStreams> ControlStreams for StreamRecvOpen<T> {
-    fn local_valid_id(id: StreamId) -> bool {
-        T::local_valid_id(id)
-    }
-
-    fn remote_valid_id(id: StreamId) -> bool {
-        T::remote_valid_id(id)
-    }
-
-    fn local_can_open() -> bool {
-        T::local_can_open()
-    }
-
-    fn local_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.local_open(id, sz)
-    }
-
-    fn remote_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.remote_open(id, sz)
-    }
-
-    fn local_open_recv_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.local_open_recv_half(id, sz)
-    }
-
-    fn remote_open_send_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.remote_open_send_half(id, sz)
-    }
-
-    fn close_send_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
-        self.inner.close_send_half(id)
-    }
-
-    fn close_recv_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
-        self.inner.close_recv_half(id)
-    }
-
-    fn reset_stream(&mut self, id: StreamId, cause: Reason) {
-        self.inner.reset_stream(id, cause)
-    }
-
-    fn get_reset(&self, id: StreamId) -> Option<Reason> {
-        self.inner.get_reset(id)
-    }
-
-    fn is_local_active(&self, id: StreamId) -> bool {
-        self.inner.is_local_active(id)
-    }
-
-    fn is_remote_active(&self, id: StreamId) -> bool {
-        self.inner.is_remote_active(id)
-    }
-
-    fn local_active_len(&self) -> usize {
-        self.inner.local_active_len()
-    }
-
-    fn remote_active_len(&self) -> usize {
-        self.inner.remote_active_len()
-    }
-
-    fn update_inital_recv_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
-        self.inner.update_inital_recv_window_size(old_sz, new_sz)
-    }
-
-    fn update_inital_send_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
-        self.inner.update_inital_send_window_size(old_sz, new_sz)
-    }
-
-    fn recv_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
-        self.inner.recv_flow_controller(id)
-    }
-
-    fn send_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
-        self.inner.send_flow_controller(id)
-    }
-
-    fn is_send_open(&mut self, id: StreamId) -> bool {
-        self.inner.is_send_open(id)
-    }
-
-    fn is_recv_open(&mut self, id: StreamId) -> bool  {
-        self.inner.is_recv_open(id)
-    }
-}
-
-/// Proxy.
-impl<T: ControlPing> ControlPing for StreamRecvOpen<T> {
-    fn start_ping(&mut self, body: PingPayload) -> StartSend<PingPayload, ConnectionError> {
-        self.inner.start_ping(body)
-    }
-
-    fn take_pong(&mut self) -> Option<PingPayload> {
-        self.inner.take_pong()
-    }
-}
+proxy_control_flow!(StreamRecvOpen);
+proxy_control_streams!(StreamRecvOpen);
+proxy_control_ping!(StreamRecvOpen);
diff --git a/src/proto/stream_send_close.rs b/src/proto/stream_send_close.rs
index cf00e7f..bc75757 100644
--- a/src/proto/stream_send_close.rs
+++ b/src/proto/stream_send_close.rs
@@ -74,111 +74,7 @@ impl<T, U> ReadySink for StreamSendClose<T>
     }
 }
 
-/// Proxy.
-impl<T: ApplySettings> ApplySettings for StreamSendClose<T> {
-    fn apply_local_settings(&mut self, set: &frame::SettingSet) -> Result<(), ConnectionError> {
-        self.inner.apply_local_settings(set)
-    }
-
-    fn apply_remote_settings(&mut self, set: &frame::SettingSet) -> Result<(), ConnectionError> {
-        self.inner.apply_remote_settings(set)
-    }
-}
-
-/// Proxy.
-impl<T: ControlStreams> ControlStreams for StreamSendClose<T> {
-    fn local_valid_id(id: StreamId) -> bool {
-        T::local_valid_id(id)
-    }
-
-    fn remote_valid_id(id: StreamId) -> bool {
-        T::remote_valid_id(id)
-    }
-
-    fn local_can_open() -> bool {
-        T::local_can_open()
-    }
-
-    fn local_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.local_open(id, sz)
-    }
-
-    fn remote_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.remote_open(id, sz)
-    }
-
-    fn local_open_recv_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.local_open_recv_half(id, sz)
-    }
-
-    fn remote_open_send_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.remote_open_send_half(id, sz)
-    }
-
-    fn close_send_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
-        self.inner.close_send_half(id)
-    }
-
-    fn close_recv_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
-        self.inner.close_recv_half(id)
-    }
-
-    fn reset_stream(&mut self, id: StreamId, cause: Reason) {
-        self.inner.reset_stream(id, cause)
-    }
-
-    fn get_reset(&self, id: StreamId) -> Option<Reason> {
-        self.inner.get_reset(id)
-    }
-
-    fn is_local_active(&self, id: StreamId) -> bool {
-        self.inner.is_local_active(id)
-    }
-
-    fn is_remote_active(&self, id: StreamId) -> bool {
-        self.inner.is_remote_active(id)
-    }
-
-    fn local_active_len(&self) -> usize {
-        self.inner.local_active_len()
-    }
-
-    fn remote_active_len(&self) -> usize {
-        self.inner.remote_active_len()
-    }
-
-    fn update_inital_recv_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
-        self.inner.update_inital_recv_window_size(old_sz, new_sz)
-    }
-
-    fn update_inital_send_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
-        self.inner.update_inital_send_window_size(old_sz, new_sz)
-    }
-
-    fn recv_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
-        self.inner.recv_flow_controller(id)
-    }
-
-    fn send_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
-        self.inner.send_flow_controller(id)
-    }
-
-    fn is_send_open(&mut self, id: StreamId) -> bool {
-        self.inner.is_send_open(id)
-    }
-
-    fn is_recv_open(&mut self, id: StreamId) -> bool  {
-        self.inner.is_recv_open(id)
-    }
-}
-
-/// Proxy.
-impl<T: ControlPing> ControlPing for StreamSendClose<T> {
-    fn start_ping(&mut self, body: PingPayload) -> StartSend<PingPayload, ConnectionError> {
-        self.inner.start_ping(body)
-    }
-
-    fn take_pong(&mut self) -> Option<PingPayload> {
-        self.inner.take_pong()
-    }
-}
+proxy_apply_settings!(StreamSendClose);
+proxy_control_flow!(StreamSendClose);
+proxy_control_streams!(StreamSendClose);
+proxy_control_ping!(StreamSendClose);
diff --git a/src/proto/stream_send_open.rs b/src/proto/stream_send_open.rs
index 13be1a0..d4046d5 100644
--- a/src/proto/stream_send_open.rs
+++ b/src/proto/stream_send_open.rs
@@ -156,111 +156,6 @@ impl<T, U> ReadySink for StreamSendOpen<T>
     }
 }
 
-/// Proxy.
-impl<T: ControlStreams> ControlStreams for StreamSendOpen<T> {
-    fn local_valid_id(id: StreamId) -> bool {
-        T::local_valid_id(id)
-    }
-
-    fn remote_valid_id(id: StreamId) -> bool {
-        T::remote_valid_id(id)
-    }
-
-    fn local_can_open() -> bool {
-        T::local_can_open()
-    }
-
-    fn local_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.local_open(id, sz)
-    }
-
-    fn remote_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.remote_open(id, sz)
-    }
-
-    fn local_open_recv_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.local_open_recv_half(id, sz)
-    }
-
-    fn remote_open_send_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.remote_open_send_half(id, sz)
-    }
-
-    fn close_send_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
-        self.inner.close_send_half(id)
-    }
-
-    fn close_recv_half(&mut self, id: StreamId) -> Result<(), ConnectionError> {
-        self.inner.close_recv_half(id)
-    }
-
-    fn reset_stream(&mut self, id: StreamId, cause: Reason) {
-        self.inner.reset_stream(id, cause)
-    }
-
-    fn get_reset(&self, id: StreamId) -> Option<Reason> {
-        self.inner.get_reset(id)
-    }
-
-    fn is_local_active(&self, id: StreamId) -> bool {
-        self.inner.is_local_active(id)
-    }
-
-    fn is_remote_active(&self, id: StreamId) -> bool {
-        self.inner.is_remote_active(id)
-    }
-
-    fn local_active_len(&self) -> usize {
-        self.inner.local_active_len()
-    }
-
-    fn remote_active_len(&self) -> usize {
-        self.inner.remote_active_len()
-    }
-
-    fn update_inital_recv_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
-        self.inner.update_inital_recv_window_size(old_sz, new_sz)
-    }
-
-    fn update_inital_send_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize) {
-        self.inner.update_inital_send_window_size(old_sz, new_sz)
-    }
-
-    fn recv_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
-        self.inner.recv_flow_controller(id)
-    }
-
-    fn send_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState> {
-        self.inner.send_flow_controller(id)
-    }
-
-    fn is_send_open(&mut self, id: StreamId) -> bool {
-        self.inner.is_send_open(id)
-    }
-
-    fn is_recv_open(&mut self, id: StreamId) -> bool  {
-        self.inner.is_recv_open(id)
-    }
-}
-
-/// Proxy.
-impl<T: ControlFlow> ControlFlow for StreamSendOpen<T> {
-    fn poll_window_update(&mut self) -> Poll<WindowUpdate, ConnectionError> {
-        self.inner.poll_window_update()
-    }
-
-    fn expand_window(&mut self, id: StreamId, incr: WindowSize) -> Result<(), ConnectionError> {
-        self.inner.expand_window(id, incr)
-    }
-}
-
-/// Proxy.
-impl<T: ControlPing> ControlPing for StreamSendOpen<T> {
-    fn start_ping(&mut self, body: PingPayload) -> StartSend<PingPayload, ConnectionError> {
-        self.inner.start_ping(body)
-    }
-
-    fn take_pong(&mut self) -> Option<PingPayload> {
-        self.inner.take_pong()
-    }
-}
+proxy_control_flow!(StreamSendOpen);
+proxy_control_streams!(StreamSendOpen);
+proxy_control_ping!(StreamSendOpen);
diff --git a/src/proto/stream_store.rs b/src/proto/stream_store.rs
index fc93d6e..7e8a691 100644
--- a/src/proto/stream_store.rs
+++ b/src/proto/stream_store.rs
@@ -8,115 +8,6 @@ use ordermap::OrderMap;
 use std::hash::BuildHasherDefault;
 use std::marker::PhantomData;
 
-/// Exposes stream states to "upper" layers of the transport (i.e. from StreamTracker up
-/// to Connection).
-pub trait ControlStreams {
-    /// Determines whether the given stream could theoretically be opened by the local
-    /// side of this connection.
-    fn local_valid_id(id: StreamId) -> bool;
-
-    /// Determines whether the given stream could theoretically be opened by the remote
-    /// side of this connection.
-    fn remote_valid_id(id: StreamId) -> bool;
-
-    /// Indicates whether this local endpoint may open streams (with HEADERS).
-    ///
-    /// Implies that this endpoint is a client.
-    fn local_can_open() -> bool;
-
-    /// Indicates whether this remote endpoint may open streams (with HEADERS).
-    ///
-    /// Implies that this endpoint is a server.
-    fn remote_can_open() -> bool {
-        !Self::local_can_open()
-    }
-
-    /// Creates a new stream in the OPEN state from the local side (i.e. as a Client).
-    ///
-    /// Must only be called when local_can_open returns true.
-    fn local_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError>;
-
-    /// Create a new stream in the OPEN state from the remote side (i.e. as a Server).
-    ///
-    /// Must only be called when remote_can_open returns true.
-    fn remote_open(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError>;
-
-    /// Prepare the receive side of a local stream to receive data from the remote.
-    ///
-    /// Typically called when a client receives a response header.
-    fn local_open_recv_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError>;
-
-    /// Prepare the send side of a remote stream to receive data from the local endpoint.
-    ///
-    /// Typically called when a server sends a response header.
-    fn remote_open_send_half(&mut self, id: StreamId, sz: WindowSize) -> Result<(), ConnectionError>;
-
-    // TODO push promise
-    // fn local_reserve(&mut self, id: StreamId) -> Result<(), ConnectionError>;
-    // fn remote_reserve(&mut self, id: StreamId) -> Result<(), ConnectionError>;
-
-    /// Closes the send half of a stream.
-    ///
-    /// Fails with a ProtocolError if send half of the stream was not open.
-    fn close_send_half(&mut self, id: StreamId) -> Result<(), ConnectionError>;
-
-    /// Closes the recv half of a stream.
-    ///
-    /// Fails with a ProtocolError if recv half of the stream was not open.
-    fn close_recv_half(&mut self, id: StreamId) -> Result<(), ConnectionError>;
-
-    /// Resets the given stream.
-    ///
-    /// If the stream was already reset, the stored cause is updated.
-    fn reset_stream(&mut self, id: StreamId, cause: Reason);
-
-    /// Get the reason the stream was reset, if it was reset.
-    fn get_reset(&self, id: StreamId) -> Option<Reason>;
-
-    /// Returns true if the given stream was opened by the local peer and is not yet
-    /// closed.
-    fn is_local_active(&self, id: StreamId) -> bool;
-
-    /// Returns true if the given stream was opened by the remote peer and is not yet
-    /// closed.
-    fn is_remote_active(&self, id: StreamId) -> bool;
-
-    /// Returns true if the given stream was opened and is not yet closed.
-    fn is_active(&self, id: StreamId) -> bool {
-        if Self::local_valid_id(id) {
-            self.is_local_active(id)
-        } else {
-            self.is_remote_active(id)
-        }
-    }
-
-    /// Returns the number of open streams initiated by the local peer.
-    fn local_active_len(&self) -> usize;
-
-    /// Returns the number of open streams initiated by the remote peer.
-    fn remote_active_len(&self) -> usize;
-
-    /// Returns true iff the recv half of the given stream is open.
-    fn is_recv_open(&mut self, id: StreamId) -> bool;
-
-    /// Returns true iff the send half of the given stream is open.
-    fn is_send_open(&mut self, id: StreamId) -> bool;
-
-    /// If the given stream ID is active and able to recv data, get its mutable recv flow
-    /// control state.
-    fn recv_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState>;
-
-    /// If the given stream ID is active and able to send data, get its mutable send flow
-    /// control state.
-    fn send_flow_controller(&mut self, id: StreamId) -> Option<&mut FlowControlState>;
-
-    /// Updates the initial window size for the local peer.
-    fn update_inital_recv_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize);
-
-    /// Updates the initial window size for the remote peer.
-    fn update_inital_send_window_size(&mut self, old_sz: WindowSize, new_sz: WindowSize);
-}
-
 /// Holds the underlying stream state to be accessed by upper layers.
 // TODO track reserved streams
 // TODO constrain the size of `reset`