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// Copyright 2014 The Go 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 icmp
import (
"golang.org/x/net/internal/iana"
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6"
)
// A TimeExceeded represents an ICMP time exceeded message body.
type TimeExceeded struct {
Data []byte // data, known as original datagram field
Extensions []Extension // extensions
}
// Len implements the Len method of MessageBody interface.
func (p *TimeExceeded) Len(proto int) int {
if p == nil {
return 0
}
l, _ := multipartMessageBodyDataLen(proto, true, p.Data, p.Extensions)
return l
}
// Marshal implements the Marshal method of MessageBody interface.
func (p *TimeExceeded) Marshal(proto int) ([]byte, error) {
var typ Type
switch proto {
case iana.ProtocolICMP:
typ = ipv4.ICMPTypeTimeExceeded
case iana.ProtocolIPv6ICMP:
typ = ipv6.ICMPTypeTimeExceeded
default:
return nil, errInvalidProtocol
}
if !validExtensions(typ, p.Extensions) {
return nil, errInvalidExtension
}
return marshalMultipartMessageBody(proto, true, p.Data, p.Extensions)
}
// parseTimeExceeded parses b as an ICMP time exceeded message body.
func parseTimeExceeded(proto int, typ Type, b []byte) (MessageBody, error) {
if len(b) < 4 {
return nil, errMessageTooShort
}
p := &TimeExceeded{}
var err error
p.Data, p.Extensions, err = parseMultipartMessageBody(proto, typ, b)
if err != nil {
return nil, err
}
return p, nil
}
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