diff options
Diffstat (limited to 'vendor/github.com/google/gopacket/layers/icmp4.go')
| -rw-r--r-- | vendor/github.com/google/gopacket/layers/icmp4.go | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/vendor/github.com/google/gopacket/layers/icmp4.go b/vendor/github.com/google/gopacket/layers/icmp4.go new file mode 100644 index 0000000..bd3f03f --- /dev/null +++ b/vendor/github.com/google/gopacket/layers/icmp4.go @@ -0,0 +1,267 @@ +// Copyright 2012 Google, Inc. All rights reserved. +// Copyright 2009-2011 Andreas Krennmair. All rights reserved. +// +// Use of this source code is governed by a BSD-style license +// that can be found in the LICENSE file in the root of the source +// tree. + +package layers + +import ( + "encoding/binary" + "errors" + "fmt" + "reflect" + + "github.com/google/gopacket" +) + +const ( + ICMPv4TypeEchoReply = 0 + ICMPv4TypeDestinationUnreachable = 3 + ICMPv4TypeSourceQuench = 4 + ICMPv4TypeRedirect = 5 + ICMPv4TypeEchoRequest = 8 + ICMPv4TypeRouterAdvertisement = 9 + ICMPv4TypeRouterSolicitation = 10 + ICMPv4TypeTimeExceeded = 11 + ICMPv4TypeParameterProblem = 12 + ICMPv4TypeTimestampRequest = 13 + ICMPv4TypeTimestampReply = 14 + ICMPv4TypeInfoRequest = 15 + ICMPv4TypeInfoReply = 16 + ICMPv4TypeAddressMaskRequest = 17 + ICMPv4TypeAddressMaskReply = 18 +) + +const ( + // DestinationUnreachable + ICMPv4CodeNet = 0 + ICMPv4CodeHost = 1 + ICMPv4CodeProtocol = 2 + ICMPv4CodePort = 3 + ICMPv4CodeFragmentationNeeded = 4 + ICMPv4CodeSourceRoutingFailed = 5 + ICMPv4CodeNetUnknown = 6 + ICMPv4CodeHostUnknown = 7 + ICMPv4CodeSourceIsolated = 8 + ICMPv4CodeNetAdminProhibited = 9 + ICMPv4CodeHostAdminProhibited = 10 + ICMPv4CodeNetTOS = 11 + ICMPv4CodeHostTOS = 12 + ICMPv4CodeCommAdminProhibited = 13 + ICMPv4CodeHostPrecedence = 14 + ICMPv4CodePrecedenceCutoff = 15 + + // TimeExceeded + ICMPv4CodeTTLExceeded = 0 + ICMPv4CodeFragmentReassemblyTimeExceeded = 1 + + // ParameterProblem + ICMPv4CodePointerIndicatesError = 0 + ICMPv4CodeMissingOption = 1 + ICMPv4CodeBadLength = 2 + + // Redirect + // ICMPv4CodeNet = same as for DestinationUnreachable + // ICMPv4CodeHost = same as for DestinationUnreachable + ICMPv4CodeTOSNet = 2 + ICMPv4CodeTOSHost = 3 +) + +type icmpv4TypeCodeInfoStruct struct { + typeStr string + codeStr *map[uint8]string +} + +var ( + icmpv4TypeCodeInfo = map[uint8]icmpv4TypeCodeInfoStruct{ + ICMPv4TypeDestinationUnreachable: icmpv4TypeCodeInfoStruct{ + "DestinationUnreachable", &map[uint8]string{ + ICMPv4CodeNet: "Net", + ICMPv4CodeHost: "Host", + ICMPv4CodeProtocol: "Protocol", + ICMPv4CodePort: "Port", + ICMPv4CodeFragmentationNeeded: "FragmentationNeeded", + ICMPv4CodeSourceRoutingFailed: "SourceRoutingFailed", + ICMPv4CodeNetUnknown: "NetUnknown", + ICMPv4CodeHostUnknown: "HostUnknown", + ICMPv4CodeSourceIsolated: "SourceIsolated", + ICMPv4CodeNetAdminProhibited: "NetAdminProhibited", + ICMPv4CodeHostAdminProhibited: "HostAdminProhibited", + ICMPv4CodeNetTOS: "NetTOS", + ICMPv4CodeHostTOS: "HostTOS", + ICMPv4CodeCommAdminProhibited: "CommAdminProhibited", + ICMPv4CodeHostPrecedence: "HostPrecedence", + ICMPv4CodePrecedenceCutoff: "PrecedenceCutoff", + }, + }, + ICMPv4TypeTimeExceeded: icmpv4TypeCodeInfoStruct{ + "TimeExceeded", &map[uint8]string{ + ICMPv4CodeTTLExceeded: "TTLExceeded", + ICMPv4CodeFragmentReassemblyTimeExceeded: "FragmentReassemblyTimeExceeded", + }, + }, + ICMPv4TypeParameterProblem: icmpv4TypeCodeInfoStruct{ + "ParameterProblem", &map[uint8]string{ + ICMPv4CodePointerIndicatesError: "PointerIndicatesError", + ICMPv4CodeMissingOption: "MissingOption", + ICMPv4CodeBadLength: "BadLength", + }, + }, + ICMPv4TypeSourceQuench: icmpv4TypeCodeInfoStruct{ + "SourceQuench", nil, + }, + ICMPv4TypeRedirect: icmpv4TypeCodeInfoStruct{ + "Redirect", &map[uint8]string{ + ICMPv4CodeNet: "Net", + ICMPv4CodeHost: "Host", + ICMPv4CodeTOSNet: "TOS+Net", + ICMPv4CodeTOSHost: "TOS+Host", + }, + }, + ICMPv4TypeEchoRequest: icmpv4TypeCodeInfoStruct{ + "EchoRequest", nil, + }, + ICMPv4TypeEchoReply: icmpv4TypeCodeInfoStruct{ + "EchoReply", nil, + }, + ICMPv4TypeTimestampRequest: icmpv4TypeCodeInfoStruct{ + "TimestampRequest", nil, + }, + ICMPv4TypeTimestampReply: icmpv4TypeCodeInfoStruct{ + "TimestampReply", nil, + }, + ICMPv4TypeInfoRequest: icmpv4TypeCodeInfoStruct{ + "InfoRequest", nil, + }, + ICMPv4TypeInfoReply: icmpv4TypeCodeInfoStruct{ + "InfoReply", nil, + }, + ICMPv4TypeRouterSolicitation: icmpv4TypeCodeInfoStruct{ + "RouterSolicitation", nil, + }, + ICMPv4TypeRouterAdvertisement: icmpv4TypeCodeInfoStruct{ + "RouterAdvertisement", nil, + }, + ICMPv4TypeAddressMaskRequest: icmpv4TypeCodeInfoStruct{ + "AddressMaskRequest", nil, + }, + ICMPv4TypeAddressMaskReply: icmpv4TypeCodeInfoStruct{ + "AddressMaskReply", nil, + }, + } +) + +type ICMPv4TypeCode uint16 + +// Type returns the ICMPv4 type field. +func (a ICMPv4TypeCode) Type() uint8 { + return uint8(a >> 8) +} + +// Code returns the ICMPv4 code field. +func (a ICMPv4TypeCode) Code() uint8 { + return uint8(a) +} + +func (a ICMPv4TypeCode) String() string { + t, c := a.Type(), a.Code() + strInfo, ok := icmpv4TypeCodeInfo[t] + if !ok { + // Unknown ICMPv4 type field + return fmt.Sprintf("%d(%d)", t, c) + } + typeStr := strInfo.typeStr + if strInfo.codeStr == nil && c == 0 { + // The ICMPv4 type does not make use of the code field + return fmt.Sprintf("%s", strInfo.typeStr) + } + if strInfo.codeStr == nil && c != 0 { + // The ICMPv4 type does not make use of the code field, but it is present anyway + return fmt.Sprintf("%s(Code: %d)", typeStr, c) + } + codeStr, ok := (*strInfo.codeStr)[c] + if !ok { + // We don't know this ICMPv4 code; print the numerical value + return fmt.Sprintf("%s(Code: %d)", typeStr, c) + } + return fmt.Sprintf("%s(%s)", typeStr, codeStr) +} + +func (a ICMPv4TypeCode) GoString() string { + t := reflect.TypeOf(a) + return fmt.Sprintf("%s(%d, %d)", t.String(), a.Type(), a.Code()) +} + +// SerializeTo writes the ICMPv4TypeCode value to the 'bytes' buffer. +func (a ICMPv4TypeCode) SerializeTo(bytes []byte) { + binary.BigEndian.PutUint16(bytes, uint16(a)) +} + +// CreateICMPv4TypeCode is a convenience function to create an ICMPv4TypeCode +// gopacket type from the ICMPv4 type and code values. +func CreateICMPv4TypeCode(typ uint8, code uint8) ICMPv4TypeCode { + return ICMPv4TypeCode(binary.BigEndian.Uint16([]byte{typ, code})) +} + +// ICMPv4 is the layer for IPv4 ICMP packet data. +type ICMPv4 struct { + BaseLayer + TypeCode ICMPv4TypeCode + Checksum uint16 + Id uint16 + Seq uint16 +} + +// LayerType returns LayerTypeICMPv4. +func (i *ICMPv4) LayerType() gopacket.LayerType { return LayerTypeICMPv4 } + +// DecodeFromBytes decodes the given bytes into this layer. +func (i *ICMPv4) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + if len(data) < 8 { + df.SetTruncated() + return errors.New("ICMP layer less then 8 bytes for ICMPv4 packet") + } + i.TypeCode = CreateICMPv4TypeCode(data[0], data[1]) + i.Checksum = binary.BigEndian.Uint16(data[2:4]) + i.Id = binary.BigEndian.Uint16(data[4:6]) + i.Seq = binary.BigEndian.Uint16(data[6:8]) + i.BaseLayer = BaseLayer{data[:8], data[8:]} + return nil +} + +// SerializeTo writes the serialized form of this layer into the +// SerializationBuffer, implementing gopacket.SerializableLayer. +// See the docs for gopacket.SerializableLayer for more info. +func (i *ICMPv4) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { + bytes, err := b.PrependBytes(8) + if err != nil { + return err + } + i.TypeCode.SerializeTo(bytes) + binary.BigEndian.PutUint16(bytes[4:], i.Id) + binary.BigEndian.PutUint16(bytes[6:], i.Seq) + if opts.ComputeChecksums { + bytes[2] = 0 + bytes[3] = 0 + i.Checksum = tcpipChecksum(b.Bytes(), 0) + } + binary.BigEndian.PutUint16(bytes[2:], i.Checksum) + return nil +} + +// CanDecode returns the set of layer types that this DecodingLayer can decode. +func (i *ICMPv4) CanDecode() gopacket.LayerClass { + return LayerTypeICMPv4 +} + +// NextLayerType returns the layer type contained by this DecodingLayer. +func (i *ICMPv4) NextLayerType() gopacket.LayerType { + return gopacket.LayerTypePayload +} + +func decodeICMPv4(data []byte, p gopacket.PacketBuilder) error { + i := &ICMPv4{} + return decodingLayerDecoder(i, data, p) +} |