1 files changed, 149 insertions, 0 deletions
diff --git a/pkg/tcpip/link/waitable/waitable.go b/pkg/tcpip/link/waitable/waitable.go
new file mode 100755
index 000000000..a8de38979
--- /dev/null
+++ b/pkg/tcpip/link/waitable/waitable.go
@@ -0,0 +1,149 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package waitable provides the implementation of data-link layer endpoints
+// that wrap other endpoints, and can wait for inflight calls to WritePacket or
+// DeliverNetworkPacket to finish (and new ones to be prevented).
+//
+// Waitable endpoints can be used in the networking stack by calling New(eID) to
+// create a new endpoint, where eID is the ID of the endpoint being wrapped,
+// and then passing it as an argument to Stack.CreateNIC().
+package waitable
+
+import (
+	"gvisor.dev/gvisor/pkg/gate"
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/buffer"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+// Endpoint is a waitable link-layer endpoint.
+type Endpoint struct {
+	dispatchGate gate.Gate
+	dispatcher   stack.NetworkDispatcher
+
+	writeGate gate.Gate
+	lower     stack.LinkEndpoint
+}
+
+// New creates a new waitable link-layer endpoint. It wraps around another
+// endpoint and allows the caller to block new write/dispatch calls and wait for
+// the inflight ones to finish before returning.
+func New(lower stack.LinkEndpoint) *Endpoint {
+	return &Endpoint{
+		lower: lower,
+	}
+}
+
+// DeliverNetworkPacket implements stack.NetworkDispatcher.DeliverNetworkPacket.
+// It is called by the link-layer endpoint being wrapped when a packet arrives,
+// and only forwards to the actual dispatcher if Wait or WaitDispatch haven't
+// been called.
+func (e *Endpoint) DeliverNetworkPacket(linkEP stack.LinkEndpoint, remote, local tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, pkt tcpip.PacketBuffer) {
+	if !e.dispatchGate.Enter() {
+		return
+	}
+
+	e.dispatcher.DeliverNetworkPacket(e, remote, local, protocol, pkt)
+	e.dispatchGate.Leave()
+}
+
+// Attach implements stack.LinkEndpoint.Attach. It saves the dispatcher and
+// registers with the lower endpoint as its dispatcher so that "e" is called
+// for inbound packets.
+func (e *Endpoint) Attach(dispatcher stack.NetworkDispatcher) {
+	e.dispatcher = dispatcher
+	e.lower.Attach(e)
+}
+
+// IsAttached implements stack.LinkEndpoint.IsAttached.
+func (e *Endpoint) IsAttached() bool {
+	return e.dispatcher != nil
+}
+
+// MTU implements stack.LinkEndpoint.MTU. It just forwards the request to the
+// lower endpoint.
+func (e *Endpoint) MTU() uint32 {
+	return e.lower.MTU()
+}
+
+// Capabilities implements stack.LinkEndpoint.Capabilities. It just forwards the
+// request to the lower endpoint.
+func (e *Endpoint) Capabilities() stack.LinkEndpointCapabilities {
+	return e.lower.Capabilities()
+}
+
+// MaxHeaderLength implements stack.LinkEndpoint.MaxHeaderLength. It just
+// forwards the request to the lower endpoint.
+func (e *Endpoint) MaxHeaderLength() uint16 {
+	return e.lower.MaxHeaderLength()
+}
+
+// LinkAddress implements stack.LinkEndpoint.LinkAddress. It just forwards the
+// request to the lower endpoint.
+func (e *Endpoint) LinkAddress() tcpip.LinkAddress {
+	return e.lower.LinkAddress()
+}
+
+// WritePacket implements stack.LinkEndpoint.WritePacket. It is called by
+// higher-level protocols to write packets. It only forwards packets to the
+// lower endpoint if Wait or WaitWrite haven't been called.
+func (e *Endpoint) WritePacket(r *stack.Route, gso *stack.GSO, protocol tcpip.NetworkProtocolNumber, pkt tcpip.PacketBuffer) *tcpip.Error {
+	if !e.writeGate.Enter() {
+		return nil
+	}
+
+	err := e.lower.WritePacket(r, gso, protocol, pkt)
+	e.writeGate.Leave()
+	return err
+}
+
+// WritePackets implements stack.LinkEndpoint.WritePackets. It is called by
+// higher-level protocols to write packets. It only forwards packets to the
+// lower endpoint if Wait or WaitWrite haven't been called.
+func (e *Endpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts []tcpip.PacketBuffer, protocol tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
+	if !e.writeGate.Enter() {
+		return len(pkts), nil
+	}
+
+	n, err := e.lower.WritePackets(r, gso, pkts, protocol)
+	e.writeGate.Leave()
+	return n, err
+}
+
+// WriteRawPacket implements stack.LinkEndpoint.WriteRawPacket.
+func (e *Endpoint) WriteRawPacket(vv buffer.VectorisedView) *tcpip.Error {
+	if !e.writeGate.Enter() {
+		return nil
+	}
+
+	err := e.lower.WriteRawPacket(vv)
+	e.writeGate.Leave()
+	return err
+}
+
+// WaitWrite prevents new calls to WritePacket from reaching the lower endpoint,
+// and waits for inflight ones to finish before returning.
+func (e *Endpoint) WaitWrite() {
+	e.writeGate.Close()
+}
+
+// WaitDispatch prevents new calls to DeliverNetworkPacket from reaching the
+// actual dispatcher, and waits for inflight ones to finish before returning.
+func (e *Endpoint) WaitDispatch() {
+	e.dispatchGate.Close()
+}
+
+// Wait implements stack.LinkEndpoint.Wait.
+func (e *Endpoint) Wait() {}