diff options
Diffstat (limited to 'vendor/golang.org/x/net/icmp/packettoobig.go')
-rw-r--r-- | vendor/golang.org/x/net/icmp/packettoobig.go | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/vendor/golang.org/x/net/icmp/packettoobig.go b/vendor/golang.org/x/net/icmp/packettoobig.go new file mode 100644 index 000000000..a1c9df7bf --- /dev/null +++ b/vendor/golang.org/x/net/icmp/packettoobig.go @@ -0,0 +1,43 @@ +// 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 "encoding/binary" + +// A PacketTooBig represents an ICMP packet too big message body. +type PacketTooBig struct { + MTU int // maximum transmission unit of the nexthop link + Data []byte // data, known as original datagram field +} + +// Len implements the Len method of MessageBody interface. +func (p *PacketTooBig) Len(proto int) int { + if p == nil { + return 0 + } + return 4 + len(p.Data) +} + +// Marshal implements the Marshal method of MessageBody interface. +func (p *PacketTooBig) Marshal(proto int) ([]byte, error) { + b := make([]byte, 4+len(p.Data)) + binary.BigEndian.PutUint32(b[:4], uint32(p.MTU)) + copy(b[4:], p.Data) + return b, nil +} + +// parsePacketTooBig parses b as an ICMP packet too big message body. +func parsePacketTooBig(proto int, b []byte) (MessageBody, error) { + bodyLen := len(b) + if bodyLen < 4 { + return nil, errMessageTooShort + } + p := &PacketTooBig{MTU: int(binary.BigEndian.Uint32(b[:4]))} + if bodyLen > 4 { + p.Data = make([]byte, bodyLen-4) + copy(p.Data, b[4:]) + } + return p, nil +} |