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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 udp
import (
"fmt"
"time"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/stack"
"gvisor.dev/gvisor/pkg/tcpip/transport"
)
// saveReceivedAt is invoked by stateify.
func (p *udpPacket) saveReceivedAt() int64 {
return p.receivedAt.UnixNano()
}
// loadReceivedAt is invoked by stateify.
func (p *udpPacket) loadReceivedAt(nsec int64) {
p.receivedAt = time.Unix(0, nsec)
}
// saveData saves udpPacket.data field.
func (p *udpPacket) saveData() buffer.VectorisedView {
return p.data.Clone(nil)
}
// loadData loads udpPacket.data field.
func (p *udpPacket) loadData(data buffer.VectorisedView) {
p.data = data
}
// afterLoad is invoked by stateify.
func (e *endpoint) afterLoad() {
stack.StackFromEnv.RegisterRestoredEndpoint(e)
}
// beforeSave is invoked by stateify.
func (e *endpoint) beforeSave() {
e.freeze()
}
// Resume implements tcpip.ResumableEndpoint.Resume.
func (e *endpoint) Resume(s *stack.Stack) {
e.thaw()
e.mu.Lock()
defer e.mu.Unlock()
e.net.Resume(s)
e.stack = s
e.ops.InitHandler(e, e.stack, tcpip.GetStackSendBufferLimits, tcpip.GetStackReceiveBufferLimits)
switch state := e.net.State(); state {
case transport.DatagramEndpointStateInitial, transport.DatagramEndpointStateClosed:
case transport.DatagramEndpointStateBound, transport.DatagramEndpointStateConnected:
// Our saved state had a port, but we don't actually have a
// reservation. We need to remove the port from our state, but still
// pass it to the reservation machinery.
var err tcpip.Error
id := e.net.Info().ID
id.LocalPort = e.localPort
id.RemotePort = e.remotePort
id, e.boundBindToDevice, err = e.registerWithStack(e.effectiveNetProtos, id)
if err != nil {
panic(err)
}
e.localPort = id.LocalPort
e.remotePort = id.RemotePort
default:
panic(fmt.Sprintf("unhandled state = %s", state))
}
}
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