91 lines
2.8 KiB
Go
91 lines
2.8 KiB
Go
// Copyright 2018 Google Inc.
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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 ping
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import (
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"gvisor.googlesource.com/gvisor/pkg/tcpip"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/buffer"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/stack"
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)
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// saveData saves pingPacket.data field.
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func (p *pingPacket) 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 pingPacket.data field.
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func (p *pingPacket) 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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// beforeSave is invoked by stateify.
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func (e *endpoint) beforeSave() {
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// Stop incoming packets from being handled (and mutate endpoint state).
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// The lock will be released after savercvBufSizeMax(), which would have
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// saved e.rcvBufSizeMax and set it to 0 to continue blocking incoming
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// packets.
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e.rcvMu.Lock()
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}
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// saveRcvBufSizeMax is invoked by stateify.
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func (e *endpoint) saveRcvBufSizeMax() int {
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max := e.rcvBufSizeMax
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// Make sure no new packets will be handled regardless of the lock.
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e.rcvBufSizeMax = 0
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// Release the lock acquired in beforeSave() so regular endpoint closing
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// logic can proceed after save.
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e.rcvMu.Unlock()
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return max
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}
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// loadRcvBufSizeMax is invoked by stateify.
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func (e *endpoint) loadRcvBufSizeMax(max int) {
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e.rcvBufSizeMax = max
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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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e.stack = stack.StackFromEnv
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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.regNICID, e.bindAddr, e.id.RemoteAddress, e.netProto)
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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.regNICID, 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.regNICID, []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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