90 lines
2.6 KiB
Go
90 lines
2.6 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package icmp
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import (
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"time"
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"gvisor.dev/gvisor/pkg/tcpip"
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"gvisor.dev/gvisor/pkg/tcpip/buffer"
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"gvisor.dev/gvisor/pkg/tcpip/stack"
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)
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// saveReceivedAt is invoked by stateify.
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func (p *icmpPacket) saveReceivedAt() int64 {
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return p.receivedAt.UnixNano()
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}
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// loadReceivedAt is invoked by stateify.
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func (p *icmpPacket) loadReceivedAt(nsec int64) {
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p.receivedAt = time.Unix(0, nsec)
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}
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// saveData saves icmpPacket.data field.
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func (p *icmpPacket) saveData() buffer.VectorisedView {
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// We cannot save p.data directly as p.data.views may alias to p.views,
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// which is not allowed by state framework (in-struct pointer).
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return p.data.Clone(nil)
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}
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// loadData loads icmpPacket.data field.
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func (p *icmpPacket) loadData(data buffer.VectorisedView) {
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// NOTE: We cannot do the p.data = data.Clone(p.views[:]) optimization
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// here because data.views is not guaranteed to be loaded by now. Plus,
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// data.views will be allocated anyway so there really is little point
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// of utilizing p.views for data.views.
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p.data = data
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}
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// afterLoad is invoked by stateify.
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func (e *endpoint) afterLoad() {
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stack.StackFromEnv.RegisterRestoredEndpoint(e)
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}
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// beforeSave is invoked by stateify.
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func (e *endpoint) beforeSave() {
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e.freeze()
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}
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// Resume implements tcpip.ResumableEndpoint.Resume.
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func (e *endpoint) Resume(s *stack.Stack) {
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e.thaw()
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e.stack = s
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e.ops.InitHandler(e, e.stack, tcpip.GetStackSendBufferLimits, tcpip.GetStackReceiveBufferLimits)
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if e.state != stateBound && e.state != stateConnected {
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return
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}
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var err tcpip.Error
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if e.state == stateConnected {
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e.route, err = e.stack.FindRoute(e.RegisterNICID, e.BindAddr, e.ID.RemoteAddress, e.NetProto, false /* multicastLoop */)
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if err != nil {
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panic(err)
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}
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e.ID.LocalAddress = e.route.LocalAddress()
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} else if len(e.ID.LocalAddress) != 0 { // stateBound
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if e.stack.CheckLocalAddress(e.RegisterNICID, e.NetProto, e.ID.LocalAddress) == 0 {
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panic(&tcpip.ErrBadLocalAddress{})
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}
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}
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e.ID, err = e.registerWithStack(e.RegisterNICID, []tcpip.NetworkProtocolNumber{e.NetProto}, e.ID)
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if err != nil {
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panic(err)
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}
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}
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