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// Copyright 2016 The Netstack Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ping
import (
"gvisor.googlesource.com/gvisor/pkg/tcpip"
"gvisor.googlesource.com/gvisor/pkg/tcpip/buffer"
"gvisor.googlesource.com/gvisor/pkg/tcpip/stack"
)
// saveData saves pingPacket.data field.
func (p *pingPacket) saveData() buffer.VectorisedView {
// We cannot save p.data directly as p.data.views may alias to p.views,
// which is not allowed by state framework (in-struct pointer).
return p.data.Clone(nil)
}
// loadData loads pingPacket.data field.
func (p *pingPacket) loadData(data buffer.VectorisedView) {
// NOTE: We cannot do the p.data = data.Clone(p.views[:]) optimization
// here because data.views is not guaranteed to be loaded by now. Plus,
// data.views will be allocated anyway so there really is little point
// of utilizing p.views for data.views.
p.data = data
}
// beforeSave is invoked by stateify.
func (e *endpoint) beforeSave() {
// Stop incoming packets from being handled (and mutate endpoint state).
e.rcvMu.Lock()
}
// afterLoad is invoked by stateify.
func (e *endpoint) afterLoad() {
e.stack = stack.StackFromEnv
if e.state != stateBound && e.state != stateConnected {
return
}
var err *tcpip.Error
if e.state == stateConnected {
e.route, err = e.stack.FindRoute(e.regNICID, e.bindAddr, e.id.RemoteAddress, e.netProto)
if err != nil {
panic(*err)
}
e.id.LocalAddress = e.route.LocalAddress
} else if len(e.id.LocalAddress) != 0 { // stateBound
if e.stack.CheckLocalAddress(e.regNICID, e.netProto, e.id.LocalAddress) == 0 {
panic(tcpip.ErrBadLocalAddress)
}
}
e.id, err = e.registerWithStack(e.regNICID, []tcpip.NetworkProtocolNumber{e.netProto}, e.id)
if err != nil {
panic(*err)
}
}
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