Merge release-20190806.1-248-g016a269 (automated)
This commit is contained in:
commit
ea1fd36836
|
@ -0,0 +1,138 @@
|
|||
// 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 channel provides the implemention of channel-based data-link layer
|
||||
// endpoints. Such endpoints allow injection of inbound packets and store
|
||||
// outbound packets in a channel.
|
||||
package channel
|
||||
|
||||
import (
|
||||
"gvisor.dev/gvisor/pkg/tcpip"
|
||||
"gvisor.dev/gvisor/pkg/tcpip/buffer"
|
||||
"gvisor.dev/gvisor/pkg/tcpip/stack"
|
||||
)
|
||||
|
||||
// PacketInfo holds all the information about an outbound packet.
|
||||
type PacketInfo struct {
|
||||
Header buffer.View
|
||||
Payload buffer.View
|
||||
Proto tcpip.NetworkProtocolNumber
|
||||
GSO *stack.GSO
|
||||
}
|
||||
|
||||
// Endpoint is link layer endpoint that stores outbound packets in a channel
|
||||
// and allows injection of inbound packets.
|
||||
type Endpoint struct {
|
||||
dispatcher stack.NetworkDispatcher
|
||||
mtu uint32
|
||||
linkAddr tcpip.LinkAddress
|
||||
GSO bool
|
||||
|
||||
// C is where outbound packets are queued.
|
||||
C chan PacketInfo
|
||||
}
|
||||
|
||||
// New creates a new channel endpoint.
|
||||
func New(size int, mtu uint32, linkAddr tcpip.LinkAddress) *Endpoint {
|
||||
return &Endpoint{
|
||||
C: make(chan PacketInfo, size),
|
||||
mtu: mtu,
|
||||
linkAddr: linkAddr,
|
||||
}
|
||||
}
|
||||
|
||||
// Drain removes all outbound packets from the channel and counts them.
|
||||
func (e *Endpoint) Drain() int {
|
||||
c := 0
|
||||
for {
|
||||
select {
|
||||
case <-e.C:
|
||||
c++
|
||||
default:
|
||||
return c
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Inject injects an inbound packet.
|
||||
func (e *Endpoint) Inject(protocol tcpip.NetworkProtocolNumber, vv buffer.VectorisedView) {
|
||||
e.InjectLinkAddr(protocol, "", vv)
|
||||
}
|
||||
|
||||
// InjectLinkAddr injects an inbound packet with a remote link address.
|
||||
func (e *Endpoint) InjectLinkAddr(protocol tcpip.NetworkProtocolNumber, remote tcpip.LinkAddress, vv buffer.VectorisedView) {
|
||||
e.dispatcher.DeliverNetworkPacket(e, remote, "" /* local */, protocol, vv.Clone(nil))
|
||||
}
|
||||
|
||||
// Attach saves the stack network-layer dispatcher for use later when packets
|
||||
// are injected.
|
||||
func (e *Endpoint) Attach(dispatcher stack.NetworkDispatcher) {
|
||||
e.dispatcher = dispatcher
|
||||
}
|
||||
|
||||
// IsAttached implements stack.LinkEndpoint.IsAttached.
|
||||
func (e *Endpoint) IsAttached() bool {
|
||||
return e.dispatcher != nil
|
||||
}
|
||||
|
||||
// MTU implements stack.LinkEndpoint.MTU. It returns the value initialized
|
||||
// during construction.
|
||||
func (e *Endpoint) MTU() uint32 {
|
||||
return e.mtu
|
||||
}
|
||||
|
||||
// Capabilities implements stack.LinkEndpoint.Capabilities.
|
||||
func (e *Endpoint) Capabilities() stack.LinkEndpointCapabilities {
|
||||
caps := stack.LinkEndpointCapabilities(0)
|
||||
if e.GSO {
|
||||
caps |= stack.CapabilityGSO
|
||||
}
|
||||
return caps
|
||||
}
|
||||
|
||||
// GSOMaxSize returns the maximum GSO packet size.
|
||||
func (*Endpoint) GSOMaxSize() uint32 {
|
||||
return 1 << 15
|
||||
}
|
||||
|
||||
// MaxHeaderLength returns the maximum size of the link layer header. Given it
|
||||
// doesn't have a header, it just returns 0.
|
||||
func (*Endpoint) MaxHeaderLength() uint16 {
|
||||
return 0
|
||||
}
|
||||
|
||||
// LinkAddress returns the link address of this endpoint.
|
||||
func (e *Endpoint) LinkAddress() tcpip.LinkAddress {
|
||||
return e.linkAddr
|
||||
}
|
||||
|
||||
// WritePacket stores outbound packets into the channel.
|
||||
func (e *Endpoint) WritePacket(_ *stack.Route, gso *stack.GSO, hdr buffer.Prependable, payload buffer.VectorisedView, protocol tcpip.NetworkProtocolNumber) *tcpip.Error {
|
||||
p := PacketInfo{
|
||||
Header: hdr.View(),
|
||||
Proto: protocol,
|
||||
Payload: payload.ToView(),
|
||||
GSO: gso,
|
||||
}
|
||||
|
||||
select {
|
||||
case e.C <- p:
|
||||
default:
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// Wait implements stack.LinkEndpoint.Wait.
|
||||
func (*Endpoint) Wait() {}
|
|
@ -0,0 +1,4 @@
|
|||
// automatically generated by stateify.
|
||||
|
||||
package channel
|
||||
|
Loading…
Reference in New Issue