David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 1 | // Copyright 2014 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package icmp |
| 6 | |
| 7 | // A DstUnreach represents an ICMP destination unreachable message |
| 8 | // body. |
| 9 | type DstUnreach struct { |
| 10 | Data []byte // data, known as original datagram field |
| 11 | Extensions []Extension // extensions |
| 12 | } |
| 13 | |
| 14 | // Len implements the Len method of MessageBody interface. |
| 15 | func (p *DstUnreach) Len(proto int) int { |
| 16 | if p == nil { |
| 17 | return 0 |
| 18 | } |
| 19 | l, _ := multipartMessageBodyDataLen(proto, p.Data, p.Extensions) |
| 20 | return 4 + l |
| 21 | } |
| 22 | |
| 23 | // Marshal implements the Marshal method of MessageBody interface. |
| 24 | func (p *DstUnreach) Marshal(proto int) ([]byte, error) { |
| 25 | return marshalMultipartMessageBody(proto, p.Data, p.Extensions) |
| 26 | } |
| 27 | |
| 28 | // parseDstUnreach parses b as an ICMP destination unreachable message |
| 29 | // body. |
| 30 | func parseDstUnreach(proto int, b []byte) (MessageBody, error) { |
| 31 | if len(b) < 4 { |
| 32 | return nil, errMessageTooShort |
| 33 | } |
| 34 | p := &DstUnreach{} |
| 35 | var err error |
| 36 | p.Data, p.Extensions, err = parseMultipartMessageBody(proto, b) |
| 37 | if err != nil { |
| 38 | return nil, err |
| 39 | } |
| 40 | return p, nil |
| 41 | } |