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TUN-6666: Define packet package
This package defines IP and ICMP packet, decoders, encoder and flow
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cthuang
267
vendor/github.com/google/gopacket/layers/icmp4.go
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267
vendor/github.com/google/gopacket/layers/icmp4.go
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// Copyright 2012 Google, Inc. All rights reserved.
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// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree.
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package layers
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"reflect"
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"github.com/google/gopacket"
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)
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const (
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ICMPv4TypeEchoReply = 0
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ICMPv4TypeDestinationUnreachable = 3
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ICMPv4TypeSourceQuench = 4
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ICMPv4TypeRedirect = 5
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ICMPv4TypeEchoRequest = 8
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ICMPv4TypeRouterAdvertisement = 9
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ICMPv4TypeRouterSolicitation = 10
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ICMPv4TypeTimeExceeded = 11
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ICMPv4TypeParameterProblem = 12
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ICMPv4TypeTimestampRequest = 13
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ICMPv4TypeTimestampReply = 14
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ICMPv4TypeInfoRequest = 15
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ICMPv4TypeInfoReply = 16
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ICMPv4TypeAddressMaskRequest = 17
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ICMPv4TypeAddressMaskReply = 18
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)
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const (
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// DestinationUnreachable
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ICMPv4CodeNet = 0
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ICMPv4CodeHost = 1
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ICMPv4CodeProtocol = 2
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ICMPv4CodePort = 3
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ICMPv4CodeFragmentationNeeded = 4
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ICMPv4CodeSourceRoutingFailed = 5
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ICMPv4CodeNetUnknown = 6
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ICMPv4CodeHostUnknown = 7
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ICMPv4CodeSourceIsolated = 8
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ICMPv4CodeNetAdminProhibited = 9
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ICMPv4CodeHostAdminProhibited = 10
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ICMPv4CodeNetTOS = 11
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ICMPv4CodeHostTOS = 12
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ICMPv4CodeCommAdminProhibited = 13
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ICMPv4CodeHostPrecedence = 14
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ICMPv4CodePrecedenceCutoff = 15
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// TimeExceeded
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ICMPv4CodeTTLExceeded = 0
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ICMPv4CodeFragmentReassemblyTimeExceeded = 1
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// ParameterProblem
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ICMPv4CodePointerIndicatesError = 0
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ICMPv4CodeMissingOption = 1
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ICMPv4CodeBadLength = 2
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// Redirect
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// ICMPv4CodeNet = same as for DestinationUnreachable
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// ICMPv4CodeHost = same as for DestinationUnreachable
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ICMPv4CodeTOSNet = 2
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ICMPv4CodeTOSHost = 3
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)
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type icmpv4TypeCodeInfoStruct struct {
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typeStr string
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codeStr *map[uint8]string
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}
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var (
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icmpv4TypeCodeInfo = map[uint8]icmpv4TypeCodeInfoStruct{
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ICMPv4TypeDestinationUnreachable: icmpv4TypeCodeInfoStruct{
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"DestinationUnreachable", &map[uint8]string{
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ICMPv4CodeNet: "Net",
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ICMPv4CodeHost: "Host",
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ICMPv4CodeProtocol: "Protocol",
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ICMPv4CodePort: "Port",
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ICMPv4CodeFragmentationNeeded: "FragmentationNeeded",
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ICMPv4CodeSourceRoutingFailed: "SourceRoutingFailed",
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ICMPv4CodeNetUnknown: "NetUnknown",
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ICMPv4CodeHostUnknown: "HostUnknown",
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ICMPv4CodeSourceIsolated: "SourceIsolated",
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ICMPv4CodeNetAdminProhibited: "NetAdminProhibited",
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ICMPv4CodeHostAdminProhibited: "HostAdminProhibited",
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ICMPv4CodeNetTOS: "NetTOS",
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ICMPv4CodeHostTOS: "HostTOS",
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ICMPv4CodeCommAdminProhibited: "CommAdminProhibited",
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ICMPv4CodeHostPrecedence: "HostPrecedence",
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ICMPv4CodePrecedenceCutoff: "PrecedenceCutoff",
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},
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},
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ICMPv4TypeTimeExceeded: icmpv4TypeCodeInfoStruct{
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"TimeExceeded", &map[uint8]string{
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ICMPv4CodeTTLExceeded: "TTLExceeded",
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ICMPv4CodeFragmentReassemblyTimeExceeded: "FragmentReassemblyTimeExceeded",
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},
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},
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ICMPv4TypeParameterProblem: icmpv4TypeCodeInfoStruct{
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"ParameterProblem", &map[uint8]string{
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ICMPv4CodePointerIndicatesError: "PointerIndicatesError",
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ICMPv4CodeMissingOption: "MissingOption",
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ICMPv4CodeBadLength: "BadLength",
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},
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},
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ICMPv4TypeSourceQuench: icmpv4TypeCodeInfoStruct{
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"SourceQuench", nil,
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},
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ICMPv4TypeRedirect: icmpv4TypeCodeInfoStruct{
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"Redirect", &map[uint8]string{
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ICMPv4CodeNet: "Net",
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ICMPv4CodeHost: "Host",
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ICMPv4CodeTOSNet: "TOS+Net",
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ICMPv4CodeTOSHost: "TOS+Host",
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},
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},
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ICMPv4TypeEchoRequest: icmpv4TypeCodeInfoStruct{
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"EchoRequest", nil,
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},
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ICMPv4TypeEchoReply: icmpv4TypeCodeInfoStruct{
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"EchoReply", nil,
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},
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ICMPv4TypeTimestampRequest: icmpv4TypeCodeInfoStruct{
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"TimestampRequest", nil,
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},
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ICMPv4TypeTimestampReply: icmpv4TypeCodeInfoStruct{
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"TimestampReply", nil,
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},
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ICMPv4TypeInfoRequest: icmpv4TypeCodeInfoStruct{
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"InfoRequest", nil,
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},
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ICMPv4TypeInfoReply: icmpv4TypeCodeInfoStruct{
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"InfoReply", nil,
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},
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ICMPv4TypeRouterSolicitation: icmpv4TypeCodeInfoStruct{
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"RouterSolicitation", nil,
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},
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ICMPv4TypeRouterAdvertisement: icmpv4TypeCodeInfoStruct{
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"RouterAdvertisement", nil,
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},
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ICMPv4TypeAddressMaskRequest: icmpv4TypeCodeInfoStruct{
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"AddressMaskRequest", nil,
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},
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ICMPv4TypeAddressMaskReply: icmpv4TypeCodeInfoStruct{
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"AddressMaskReply", nil,
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},
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}
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)
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type ICMPv4TypeCode uint16
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// Type returns the ICMPv4 type field.
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func (a ICMPv4TypeCode) Type() uint8 {
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return uint8(a >> 8)
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}
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// Code returns the ICMPv4 code field.
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func (a ICMPv4TypeCode) Code() uint8 {
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return uint8(a)
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}
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func (a ICMPv4TypeCode) String() string {
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t, c := a.Type(), a.Code()
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strInfo, ok := icmpv4TypeCodeInfo[t]
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if !ok {
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// Unknown ICMPv4 type field
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return fmt.Sprintf("%d(%d)", t, c)
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}
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typeStr := strInfo.typeStr
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if strInfo.codeStr == nil && c == 0 {
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// The ICMPv4 type does not make use of the code field
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return fmt.Sprintf("%s", strInfo.typeStr)
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}
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if strInfo.codeStr == nil && c != 0 {
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// The ICMPv4 type does not make use of the code field, but it is present anyway
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return fmt.Sprintf("%s(Code: %d)", typeStr, c)
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}
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codeStr, ok := (*strInfo.codeStr)[c]
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if !ok {
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// We don't know this ICMPv4 code; print the numerical value
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return fmt.Sprintf("%s(Code: %d)", typeStr, c)
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}
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return fmt.Sprintf("%s(%s)", typeStr, codeStr)
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}
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func (a ICMPv4TypeCode) GoString() string {
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t := reflect.TypeOf(a)
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return fmt.Sprintf("%s(%d, %d)", t.String(), a.Type(), a.Code())
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}
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// SerializeTo writes the ICMPv4TypeCode value to the 'bytes' buffer.
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func (a ICMPv4TypeCode) SerializeTo(bytes []byte) {
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binary.BigEndian.PutUint16(bytes, uint16(a))
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}
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// CreateICMPv4TypeCode is a convenience function to create an ICMPv4TypeCode
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// gopacket type from the ICMPv4 type and code values.
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func CreateICMPv4TypeCode(typ uint8, code uint8) ICMPv4TypeCode {
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return ICMPv4TypeCode(binary.BigEndian.Uint16([]byte{typ, code}))
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}
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// ICMPv4 is the layer for IPv4 ICMP packet data.
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type ICMPv4 struct {
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BaseLayer
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TypeCode ICMPv4TypeCode
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Checksum uint16
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Id uint16
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Seq uint16
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}
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// LayerType returns LayerTypeICMPv4.
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func (i *ICMPv4) LayerType() gopacket.LayerType { return LayerTypeICMPv4 }
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// DecodeFromBytes decodes the given bytes into this layer.
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func (i *ICMPv4) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
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if len(data) < 8 {
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df.SetTruncated()
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return errors.New("ICMP layer less then 8 bytes for ICMPv4 packet")
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}
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i.TypeCode = CreateICMPv4TypeCode(data[0], data[1])
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i.Checksum = binary.BigEndian.Uint16(data[2:4])
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i.Id = binary.BigEndian.Uint16(data[4:6])
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i.Seq = binary.BigEndian.Uint16(data[6:8])
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i.BaseLayer = BaseLayer{data[:8], data[8:]}
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return nil
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}
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// SerializeTo writes the serialized form of this layer into the
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// SerializationBuffer, implementing gopacket.SerializableLayer.
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// See the docs for gopacket.SerializableLayer for more info.
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func (i *ICMPv4) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
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bytes, err := b.PrependBytes(8)
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if err != nil {
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return err
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}
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i.TypeCode.SerializeTo(bytes)
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binary.BigEndian.PutUint16(bytes[4:], i.Id)
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binary.BigEndian.PutUint16(bytes[6:], i.Seq)
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if opts.ComputeChecksums {
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bytes[2] = 0
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bytes[3] = 0
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i.Checksum = tcpipChecksum(b.Bytes(), 0)
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}
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binary.BigEndian.PutUint16(bytes[2:], i.Checksum)
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return nil
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}
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// CanDecode returns the set of layer types that this DecodingLayer can decode.
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func (i *ICMPv4) CanDecode() gopacket.LayerClass {
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return LayerTypeICMPv4
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}
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// NextLayerType returns the layer type contained by this DecodingLayer.
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func (i *ICMPv4) NextLayerType() gopacket.LayerType {
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return gopacket.LayerTypePayload
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}
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func decodeICMPv4(data []byte, p gopacket.PacketBuilder) error {
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i := &ICMPv4{}
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return decodingLayerDecoder(i, data, p)
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}
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