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// 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 inet
import (
"bytes"
"fmt"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/stack"
)
// TestStack is a dummy implementation of Stack for tests.
type TestStack struct {
InterfacesMap map[int32]Interface
InterfaceAddrsMap map[int32][]InterfaceAddr
RouteList []Route
SupportsIPv6Flag bool
TCPRecvBufSize TCPBufferSize
TCPSendBufSize TCPBufferSize
TCPSACKFlag bool
Recovery TCPLossRecovery
IPForwarding bool
}
// NewTestStack returns a TestStack with no network interfaces. The value of
// all other options is unspecified; tests that rely on specific values must
// set them explicitly.
func NewTestStack() *TestStack {
return &TestStack{
InterfacesMap: make(map[int32]Interface),
InterfaceAddrsMap: make(map[int32][]InterfaceAddr),
}
}
// Interfaces implements Stack.
func (s *TestStack) Interfaces() map[int32]Interface {
return s.InterfacesMap
}
// RemoveInterface implements Stack.
func (s *TestStack) RemoveInterface(idx int32) error {
delete(s.InterfacesMap, idx)
return nil
}
// InterfaceAddrs implements Stack.
func (s *TestStack) InterfaceAddrs() map[int32][]InterfaceAddr {
return s.InterfaceAddrsMap
}
// AddInterfaceAddr implements Stack.
func (s *TestStack) AddInterfaceAddr(idx int32, addr InterfaceAddr) error {
s.InterfaceAddrsMap[idx] = append(s.InterfaceAddrsMap[idx], addr)
return nil
}
// RemoveInterfaceAddr implements Stack.
func (s *TestStack) RemoveInterfaceAddr(idx int32, addr InterfaceAddr) error {
interfaceAddrs, ok := s.InterfaceAddrsMap[idx]
if !ok {
return fmt.Errorf("unknown idx: %d", idx)
}
var filteredAddrs []InterfaceAddr
for _, interfaceAddr := range interfaceAddrs {
if !bytes.Equal(interfaceAddr.Addr, addr.Addr) {
filteredAddrs = append(filteredAddrs, addr)
}
}
s.InterfaceAddrsMap[idx] = filteredAddrs
return nil
}
// SupportsIPv6 implements Stack.
func (s *TestStack) SupportsIPv6() bool {
return s.SupportsIPv6Flag
}
// TCPReceiveBufferSize implements Stack.
func (s *TestStack) TCPReceiveBufferSize() (TCPBufferSize, error) {
return s.TCPRecvBufSize, nil
}
// SetTCPReceiveBufferSize implements Stack.
func (s *TestStack) SetTCPReceiveBufferSize(size TCPBufferSize) error {
s.TCPRecvBufSize = size
return nil
}
// TCPSendBufferSize implements Stack.
func (s *TestStack) TCPSendBufferSize() (TCPBufferSize, error) {
return s.TCPSendBufSize, nil
}
// SetTCPSendBufferSize implements Stack.
func (s *TestStack) SetTCPSendBufferSize(size TCPBufferSize) error {
s.TCPSendBufSize = size
return nil
}
// TCPSACKEnabled implements Stack.
func (s *TestStack) TCPSACKEnabled() (bool, error) {
return s.TCPSACKFlag, nil
}
// SetTCPSACKEnabled implements Stack.
func (s *TestStack) SetTCPSACKEnabled(enabled bool) error {
s.TCPSACKFlag = enabled
return nil
}
// TCPRecovery implements Stack.
func (s *TestStack) TCPRecovery() (TCPLossRecovery, error) {
return s.Recovery, nil
}
// SetTCPRecovery implements Stack.
func (s *TestStack) SetTCPRecovery(recovery TCPLossRecovery) error {
s.Recovery = recovery
return nil
}
// Statistics implements Stack.
func (s *TestStack) Statistics(stat interface{}, arg string) error {
return nil
}
// RouteTable implements Stack.
func (s *TestStack) RouteTable() []Route {
return s.RouteList
}
// Resume implements Stack.
func (s *TestStack) Resume() {}
// RegisteredEndpoints implements Stack.
func (s *TestStack) RegisteredEndpoints() []stack.TransportEndpoint {
return nil
}
// CleanupEndpoints implements Stack.
func (s *TestStack) CleanupEndpoints() []stack.TransportEndpoint {
return nil
}
// RestoreCleanupEndpoints implements Stack.
func (s *TestStack) RestoreCleanupEndpoints([]stack.TransportEndpoint) {}
// SetForwarding implements Stack.
func (s *TestStack) SetForwarding(protocol tcpip.NetworkProtocolNumber, enable bool) error {
s.IPForwarding = enable
return nil
}
// PortRange implements Stack.
func (*TestStack) PortRange() (uint16, uint16) {
// Use the default Linux values per net/ipv4/af_inet.c:inet_init_net().
return 32768, 28232
}
// SetPortRange implements Stack.
func (*TestStack) SetPortRange(start uint16, end uint16) error {
// No-op.
return nil
}
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