pkg/tcpip/stack/packet_buffer_state.go

// Copyright 2019 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 stack

import "gvisor.dev/gvisor/pkg/tcpip/buffer"

// beforeSave is invoked by stateify.
func (pk *PacketBuffer) beforeSave() {
	// Non-Data fields may be slices of the Data field. This causes
	// problems for SR, so during save we make each header independent.
	pk.Header = pk.Header.DeepCopy()
	pk.LinkHeader = append(buffer.View(nil), pk.LinkHeader...)
	pk.NetworkHeader = append(buffer.View(nil), pk.NetworkHeader...)
	pk.TransportHeader = append(buffer.View(nil), pk.TransportHeader...)
}