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debug_extn.go
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/
debug_extn.go
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// Copyright 2019 ETH Zurich
//
// 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 layers
import "github.com/scionproto/scion/go/lib/common"
var _ common.Extension = (*ExtnE2EDebug)(nil)
type ExtnE2EDebug struct {
ID [5]byte
}
const E2EDebugLen = common.ExtnFirstLineLen
func NewExtnE2EDebugFromLayer(extension *Extension) (*ExtnE2EDebug, error) {
var extn ExtnE2EDebug
if err := extn.DecodeFromLayer(extension); err != nil {
return nil, err
}
return &extn, nil
}
func (o *ExtnE2EDebug) DecodeFromLayer(extension *Extension) error {
if len(extension.Data) != common.LineLen-3 {
return common.NewBasicError("bad length for E2E debug extension", nil,
"actual", len(extension.Data), "want", common.LineLen-3)
}
copy(o.ID[:], extension.Data)
return nil
}
func (o ExtnE2EDebug) Write(b common.RawBytes) error {
copy(b[:5], o.ID[:])
return nil
}
func (o ExtnE2EDebug) Pack() (common.RawBytes, error) {
b := make(common.RawBytes, o.Len())
if err := o.Write(b); err != nil {
return nil, err
}
return b, nil
}
func (o ExtnE2EDebug) Copy() common.Extension {
return &ExtnE2EDebug{}
}
func (o ExtnE2EDebug) Reverse() (bool, error) {
return true, nil
}
func (o ExtnE2EDebug) Len() int {
return E2EDebugLen
}
func (o ExtnE2EDebug) Class() common.L4ProtocolType {
return common.End2EndClass
}
func (o ExtnE2EDebug) Type() common.ExtnType {
return common.ExtnE2EDebugType
}
func (o ExtnE2EDebug) String() string {
return "E2EDebug"
}