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// Copyright 2020 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 pipe provides the implementation of pipe-like data-link layer
// endpoints. Such endpoints allow packets to be sent between two interfaces.
package pipe
import (
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/pkg/tcpip/stack"
)
var _ stack.LinkEndpoint = (*Endpoint)(nil)
// New returns both ends of a new pipe.
func New(linkAddr1, linkAddr2 tcpip.LinkAddress, capabilities stack.LinkEndpointCapabilities) (*Endpoint, *Endpoint) {
ep1 := &Endpoint{
linkAddr: linkAddr1,
capabilities: capabilities,
}
ep2 := &Endpoint{
linkAddr: linkAddr2,
linked: ep1,
capabilities: capabilities,
}
ep1.linked = ep2
return ep1, ep2
}
// Endpoint is one end of a pipe.
type Endpoint struct {
capabilities stack.LinkEndpointCapabilities
linkAddr tcpip.LinkAddress
dispatcher stack.NetworkDispatcher
linked *Endpoint
onWritePacket func(*stack.PacketBuffer)
}
// WritePacket implements stack.LinkEndpoint.
func (e *Endpoint) WritePacket(r *stack.Route, _ *stack.GSO, proto tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) *tcpip.Error {
if !e.linked.IsAttached() {
return nil
}
// The pipe endpoint will accept all multicast/broadcast link traffic and only
// unicast traffic destined to itself.
if len(e.linked.linkAddr) != 0 &&
r.RemoteLinkAddress != e.linked.linkAddr &&
r.RemoteLinkAddress != header.EthernetBroadcastAddress &&
!header.IsMulticastEthernetAddress(r.RemoteLinkAddress) {
return nil
}
e.linked.dispatcher.DeliverNetworkPacket(e.linkAddr, r.RemoteLinkAddress, proto, stack.NewPacketBuffer(stack.PacketBufferOptions{
Data: buffer.NewVectorisedView(pkt.Size(), pkt.Views()),
}))
return nil
}
// WritePackets implements stack.LinkEndpoint.
func (*Endpoint) WritePackets(*stack.Route, *stack.GSO, stack.PacketBufferList, tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
panic("not implemented")
}
// WriteRawPacket implements stack.LinkEndpoint.
func (*Endpoint) WriteRawPacket(buffer.VectorisedView) *tcpip.Error {
panic("not implemented")
}
// Attach implements stack.LinkEndpoint.
func (e *Endpoint) Attach(dispatcher stack.NetworkDispatcher) {
e.dispatcher = dispatcher
}
// IsAttached implements stack.LinkEndpoint.
func (e *Endpoint) IsAttached() bool {
return e.dispatcher != nil
}
// Wait implements stack.LinkEndpoint.
func (*Endpoint) Wait() {}
// MTU implements stack.LinkEndpoint.
func (*Endpoint) MTU() uint32 {
return header.IPv6MinimumMTU
}
// Capabilities implements stack.LinkEndpoint.
func (e *Endpoint) Capabilities() stack.LinkEndpointCapabilities {
return e.capabilities
}
// MaxHeaderLength implements stack.LinkEndpoint.
func (*Endpoint) MaxHeaderLength() uint16 {
return 0
}
// LinkAddress implements stack.LinkEndpoint.
func (e *Endpoint) LinkAddress() tcpip.LinkAddress {
return e.linkAddr
}
// ARPHardwareType implements stack.LinkEndpoint.
func (*Endpoint) ARPHardwareType() header.ARPHardwareType {
return header.ARPHardwareEther
}
// AddHeader implements stack.LinkEndpoint.
func (*Endpoint) AddHeader(_, _ tcpip.LinkAddress, _ tcpip.NetworkProtocolNumber, _ *stack.PacketBuffer) {
}
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