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// Copyright 2021 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 noop contains an endpoint that implements all tcpip.Endpoint
// functions as noops.
package noop
import (
"fmt"
"io"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/stack"
"gvisor.dev/gvisor/pkg/waiter"
)
// endpoint can be created, but all interactions have no effect or
// return errors.
//
// +stateify savable
type endpoint struct {
tcpip.DefaultSocketOptionsHandler
ops tcpip.SocketOptions
}
// New returns an initialized noop endpoint.
func New(stk *stack.Stack) tcpip.Endpoint {
// ep.ops must be in a valid, initialized state for callers of
// ep.SocketOptions.
var ep endpoint
ep.ops.InitHandler(&ep, stk, tcpip.GetStackSendBufferLimits, tcpip.GetStackReceiveBufferLimits)
return &ep
}
// Abort implements stack.TransportEndpoint.Abort.
func (*endpoint) Abort() {
// No-op.
}
// Close implements tcpip.Endpoint.Close.
func (*endpoint) Close() {
// No-op.
}
// ModerateRecvBuf implements tcpip.Endpoint.ModerateRecvBuf.
func (*endpoint) ModerateRecvBuf(int) {
// No-op.
}
func (*endpoint) SetOwner(tcpip.PacketOwner) {
// No-op.
}
// Read implements tcpip.Endpoint.Read.
func (*endpoint) Read(io.Writer, tcpip.ReadOptions) (tcpip.ReadResult, tcpip.Error) {
return tcpip.ReadResult{}, &tcpip.ErrNotPermitted{}
}
// Write implements tcpip.Endpoint.Write.
func (*endpoint) Write(tcpip.Payloader, tcpip.WriteOptions) (int64, tcpip.Error) {
return 0, &tcpip.ErrNotPermitted{}
}
// Disconnect implements tcpip.Endpoint.Disconnect.
func (*endpoint) Disconnect() tcpip.Error {
return &tcpip.ErrNotSupported{}
}
// Connect implements tcpip.Endpoint.Connect.
func (*endpoint) Connect(tcpip.FullAddress) tcpip.Error {
return &tcpip.ErrNotPermitted{}
}
// Shutdown implements tcpip.Endpoint.Shutdown.
func (*endpoint) Shutdown(tcpip.ShutdownFlags) tcpip.Error {
return &tcpip.ErrNotPermitted{}
}
// Listen implements tcpip.Endpoint.Listen.
func (*endpoint) Listen(int) tcpip.Error {
return &tcpip.ErrNotSupported{}
}
// Accept implements tcpip.Endpoint.Accept.
func (*endpoint) Accept(*tcpip.FullAddress) (tcpip.Endpoint, *waiter.Queue, tcpip.Error) {
return nil, nil, &tcpip.ErrNotSupported{}
}
// Bind implements tcpip.Endpoint.Bind.
func (*endpoint) Bind(tcpip.FullAddress) tcpip.Error {
return &tcpip.ErrNotPermitted{}
}
// GetLocalAddress implements tcpip.Endpoint.GetLocalAddress.
func (*endpoint) GetLocalAddress() (tcpip.FullAddress, tcpip.Error) {
return tcpip.FullAddress{}, &tcpip.ErrNotSupported{}
}
// GetRemoteAddress implements tcpip.Endpoint.GetRemoteAddress.
func (*endpoint) GetRemoteAddress() (tcpip.FullAddress, tcpip.Error) {
return tcpip.FullAddress{}, &tcpip.ErrNotConnected{}
}
// Readiness implements tcpip.Endpoint.Readiness.
func (*endpoint) Readiness(waiter.EventMask) waiter.EventMask {
return 0
}
// SetSockOpt implements tcpip.Endpoint.SetSockOpt.
func (*endpoint) SetSockOpt(tcpip.SettableSocketOption) tcpip.Error {
return &tcpip.ErrUnknownProtocolOption{}
}
func (*endpoint) SetSockOptInt(tcpip.SockOptInt, int) tcpip.Error {
return &tcpip.ErrUnknownProtocolOption{}
}
// GetSockOpt implements tcpip.Endpoint.GetSockOpt.
func (*endpoint) GetSockOpt(tcpip.GettableSocketOption) tcpip.Error {
return &tcpip.ErrUnknownProtocolOption{}
}
// GetSockOptInt implements tcpip.Endpoint.GetSockOptInt.
func (*endpoint) GetSockOptInt(tcpip.SockOptInt) (int, tcpip.Error) {
return 0, &tcpip.ErrUnknownProtocolOption{}
}
// HandlePacket implements stack.RawTransportEndpoint.HandlePacket.
func (*endpoint) HandlePacket(pkt *stack.PacketBuffer) {
panic(fmt.Sprintf("unreachable: noop.endpoint should never be registered, but got packet: %+v", pkt))
}
// State implements socket.Socket.State.
func (*endpoint) State() uint32 {
return 0
}
// Wait implements stack.TransportEndpoint.Wait.
func (*endpoint) Wait() {
// No-op.
}
// LastError implements tcpip.Endpoint.LastError.
func (*endpoint) LastError() tcpip.Error {
return nil
}
// SocketOptions implements tcpip.Endpoint.SocketOptions.
func (ep *endpoint) SocketOptions() *tcpip.SocketOptions {
return &ep.ops
}
// Info implements tcpip.Endpoint.Info.
func (*endpoint) Info() tcpip.EndpointInfo {
return &stack.TransportEndpointInfo{}
}
// Stats returns a pointer to the endpoint stats.
func (*endpoint) Stats() tcpip.EndpointStats {
return &tcpip.TransportEndpointStats{}
}
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