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https://github.com/soypat/lneto.git
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soypat
269 lines
15 KiB
Go
269 lines
15 KiB
Go
package lneto
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//go:generate stringer -type=EtherType,IPProto,ARPOp -linecomment -output stringers.go .
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type EtherType uint16
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// IsSize returns true if the EtherType is actually the size of the payload
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// and should NOT be interpreted as an EtherType.
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func (et EtherType) IsSize() bool { return et <= 1500 }
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// Ethernet type flags
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const (
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EtherTypeIPv4 EtherType = 0x0800 // IPv4
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EtherTypeARP EtherType = 0x0806 // ARP
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EtherTypeWakeOnLAN EtherType = 0x0842 // wake on LAN
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EtherTypeTRILL EtherType = 0x22F3 // TRILL
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EtherTypeDECnetPhase4 EtherType = 0x6003 // DECnetPhase4
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EtherTypeRARP EtherType = 0x8035 // RARP
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EtherTypeAppleTalk EtherType = 0x809B // AppleTalk
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EtherTypeAARP EtherType = 0x80F3 // AARP
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EtherTypeIPX1 EtherType = 0x8137 // IPx1
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EtherTypeIPX2 EtherType = 0x8138 // IPx2
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EtherTypeQNXQnet EtherType = 0x8204 // QNXQnet
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EtherTypeIPv6 EtherType = 0x86DD // IPv6
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EtherTypeEthernetFlowControl EtherType = 0x8808 // EthernetFlowCtl
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EtherTypeIEEE802_3 EtherType = 0x8809 // IEEE802.3
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EtherTypeCobraNet EtherType = 0x8819 // CobraNet
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EtherTypeMPLSUnicast EtherType = 0x8847 // MPLS Unicast
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EtherTypeMPLSMulticast EtherType = 0x8848 // MPLS Multicast
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EtherTypePPPoEDiscovery EtherType = 0x8863 // PPPoE discovery
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EtherTypePPPoESession EtherType = 0x8864 // PPPoE session
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EtherTypeJumboFrames EtherType = 0x8870 // jumbo frames
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EtherTypeHomePlug1_0MME EtherType = 0x887B // home plug 1 0mme
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EtherTypeIEEE802_1X EtherType = 0x888E // IEEE 802.1x
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EtherTypePROFINET EtherType = 0x8892 // profinet
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EtherTypeHyperSCSI EtherType = 0x889A // hyper SCSI
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EtherTypeAoE EtherType = 0x88A2 // AoE
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EtherTypeEtherCAT EtherType = 0x88A4 // EtherCAT
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EtherTypeEthernetPowerlink EtherType = 0x88AB // Ethernet powerlink
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EtherTypeLLDP EtherType = 0x88CC // LLDP
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EtherTypeSERCOS3 EtherType = 0x88CD // SERCOS3
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EtherTypeHomePlugAVMME EtherType = 0x88E1 // home plug AVMME
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EtherTypeMRP EtherType = 0x88E3 // MRP
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EtherTypeIEEE802_1AE EtherType = 0x88E5 // IEEE 802.1ae
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EtherTypeIEEE1588 EtherType = 0x88F7 // IEEE 1588
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EtherTypeIEEE802_1ag EtherType = 0x8902 // IEEE 802.1ag
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EtherTypeFCoE EtherType = 0x8906 // FCoE
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EtherTypeFCoEInit EtherType = 0x8914 // FCoE init
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EtherTypeRoCE EtherType = 0x8915 // RoCE
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EtherTypeCTP EtherType = 0x9000 // CTP
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EtherTypeVeritasLLT EtherType = 0xCAFE // Veritas LLT
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EtherTypeVLAN EtherType = 0x8100 // VLAN
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EtherTypeServiceVLAN EtherType = 0x88a8 // service VLAN
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// minEthPayload is the minimum payload size for an Ethernet frame, assuming
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// that no 802.1Q VLAN tags are present.
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minEthPayload = 46
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)
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// VLANTag holds priority (PCP) Drop indicator (DEI) and VLAN ID bits of the VLAN tag field.
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type VLANTag uint16
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// DropEligibleIndicator returns true if the DEI bit is set.
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// DEI may be used separately or in conjunction with PCP to indicate frames eligible to be dropped in the presence of congestion.
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func (vt VLANTag) DropEligibleIndicator() bool { return vt&(1<<3) != 0 }
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// PriorityCodePoint is 3-bit field which refers to the IEEE 802.1p class of service (CoS) and maps to the frame priority level. Different PCP values can be used to prioritize different classes of traffic
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func (vt VLANTag) PriorityCodePoint() uint8 { return uint8(vt & 0b111) }
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// VLANIdentifier 12 bit field which specifies which VLAN the frame belongs to. Values of 0 and 4095 are reserved.
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func (vt VLANTag) VLANIdentifier() uint16 { return uint16(vt) >> 4 }
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// IPToS represents the Traffic Class (a.k.a Type of Service).
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type IPToS uint8
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// DS returns the top 6 bits of the IPv4 ToS holding the Differentiated Services field
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// which is used to classify packets.
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func (tos IPToS) DS() uint8 { return uint8(tos) >> 2 }
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// ECN is the Explicit Congestion Notification which provides congestion control and non-congestion control traffic.
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func (tos IPToS) ECN() uint8 { return uint8(tos & 0b11) }
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// IPv4Flags holds fragmentation field data of an IPv4 header.
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type IPv4Flags uint16
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// IsEvil returns true if evil bit set as per [RFC3514].
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//
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// [RFC3514]: https://datatracker.ietf.org/doc/html/rfc3514
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func (f IPv4Flags) IsEvil() bool { return f&2000 != 0 }
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// DontFragment specifies whether the datagram can not be fragmented.
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// This can be used when sending packets to a host that does not have resources to perform reassembly of fragments.
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// If the DontFragment(DF) flag is set, and fragmentation is required to route the packet, then the packet is dropped.
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func (f IPv4Flags) DontFragment() bool { return f&0x4000 != 0 }
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// MoreFragments is cleared for unfragmented packets.
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// For fragmented packets, all fragments except the last have the MF flag set.
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// The last fragment has a non-zero Fragment Offset field, so it can still be differentiated from an unfragmented packet.
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func (f IPv4Flags) MoreFragments() bool { return f&0x8000 != 0 }
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// FragmentOffset specifies the offset of a particular fragment relative to the beginning of the original unfragmented IP datagram.
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// Fragments are specified in units of 8 bytes, which is why fragment lengths are always a multiple of 8; except the last, which may be smaller.
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// The fragmentation offset value for the first fragment is always 0.
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func (f IPv4Flags) FragmentOffset() uint16 { return uint16(f) & 0x1fff }
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const (
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sizeHeaderIPv4 = 20
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sizeHeaderTCP = 20
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sizeHeaderEthNoVLAN = 14
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sizeHeaderUDP = 8
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sizeHeaderARPv4 = 28
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sizeHeaderIPv6 = 40
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)
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// IPProto represents the IP protocol number.
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type IPProto uint8
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// IP protocol numbers.
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const (
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IPProtoHopByHop IPProto = 0 // IPv6 Hop-by-Hop Option [RFC8200]
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IPProtoICMP IPProto = 1 // Internet Control Message [RFC792]
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IPProtoIGMP IPProto = 2 // Internet Group Management [RFC1112]
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IPProtoGGP IPProto = 3 // Gateway-to-Gateway [RFC823]
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IPProtoIPv4 IPProto = 4 // IPv4 encapsulation [RFC2003]
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IPProtoST IPProto = 5 // Stream [RFC1190, RFC1819]
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IPProtoTCP IPProto = 6 // Transmission Control [RFC793]
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IPProtoCBT IPProto = 7 // CBT [Ballardie]
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IPProtoEGP IPProto = 8 // Exterior Gateway Protocol [RFC888]
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IPProtoIGP IPProto = 9 // any private interior gateway (used by Cisco for their IGRP)
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IPProtoBBNRCCMON IPProto = 10 // BBN RCC Monitoring
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IPProtoNVP IPProto = 11 // Network Voice Protocol [RFC741]
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IPProtoPUP IPProto = 12 // PUP
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IPProtoARGUS IPProto = 13 // ARGUS
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IPProtoEMCON IPProto = 14 // EMCON
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IPProtoXNET IPProto = 15 // Cross Net Debugger
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IPProtoCHAOS IPProto = 16 // Chaos
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IPProtoUDP IPProto = 17 // User Datagram [RFC768]
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IPProtoMUX IPProto = 18 // Multiplexing
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IPProtoDCNMEAS IPProto = 19 // DCN Measurement Subsystems
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IPProtoHMP IPProto = 20 // Host Monitoring [RFC869]
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IPProtoPRM IPProto = 21 // Packet Radio Measurement
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IPProtoXNSIDP IPProto = 22 // XEROX NS IDP
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IPProtoTRUNK1 IPProto = 23 // Trunk-1
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IPProtoTRUNK2 IPProto = 24 // Trunk-2
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IPProtoLEAF1 IPProto = 25 // Leaf-1
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IPProtoLEAF2 IPProto = 26 // Leaf-2
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IPProtoRDP IPProto = 27 // Reliable Data Protocol [RFC908]
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IPProtoIRTP IPProto = 28 // Internet Reliable Transaction [RFC938]
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IPProtoISO_TP4 IPProto = 29 // ISO Transport Protocol Class 4 [RFC905]
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IPProtoNETBLT IPProto = 30 // Bulk Data Transfer Protocol [RFC998]
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IPProtoMFE_NSP IPProto = 31 // MFE Network Services Protocol
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IPProtoMERIT_INP IPProto = 32 // MERIT Internodal Protocol
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IPProtoDCCP IPProto = 33 // Datagram Congestion Control Protocol [RFC4340]
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IPProto3PC IPProto = 34 // Third Party Connect Protocol
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IPProtoIDPR IPProto = 35 // Inter-Domain Policy Routing Protocol
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IPProtoXTP IPProto = 36 // XTP
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IPProtoDDP IPProto = 37 // Datagram Delivery Protocol
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IPProtoIDPRCMTP IPProto = 38 // IDPR Control Message Transport Proto
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IPProtoTPPLUSPLUS IPProto = 39 // TP++ Transport Protocol
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IPProtoIL IPProto = 40 // IL Transport Protocol
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IPProtoIPv6 IPProto = 41 // IPv6 encapsulation [RFC2473]
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IPProtoSDRP IPProto = 42 // Source Demand Routing Protocol
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IPProtoIPv6Route IPProto = 43 // Routing Header for IPv6 [RFC8200]
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IPProtoIPv6Frag IPProto = 44 // Fragment Header for IPv6 [RFC8200]
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IPProtoIDRP IPProto = 45 // Inter-Domain Routing Protocol
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IPProtoRSVP IPProto = 46 // Reservation Protocol [RFC2205]
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IPProtoGRE IPProto = 47 // Generic Routing Encapsulation [RFC2784]
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IPProtoDSR IPProto = 48 // Dynamic Source Routing Protocol
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IPProtoBNA IPProto = 49 // BNA
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IPProtoESP IPProto = 50 // Encap Security Payload [RFC4303]
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IPProtoAH IPProto = 51 // Authentication Header [RFC4302]
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IPProtoINLSP IPProto = 52 // Integrated Net Layer Security TUBA
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IPProtoSWIPE IPProto = 53 // IP with Encryption
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IPProtoNARP IPProto = 54 // NBMA Address Resolution Protocol
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IPProtoMOBILE IPProto = 55 // IP Mobility
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IPProtoTLSP IPProto = 56 // Transport Layer Security Protocol using Kryptonet key management
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IPProtoSKIP IPProto = 57 // SKIP
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IPProtoIPv6ICMP IPProto = 58 // ICMP for IPv6 [RFC8200]
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IPProtoIPv6NoNxt IPProto = 59 // No Next Header for IPv6 [RFC8200]
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IPProtoIPv6Opts IPProto = 60 // Destination Options for IPv6 [RFC8200]
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IPProtoCFTP IPProto = 62 // CFTP
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IPProtoSATEXPAK IPProto = 64 // SATNET and Backroom EXPAK
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IPProtoKRYPTOLAN IPProto = 65 // Kryptolan
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IPProtoRVD IPProto = 66 // MIT Remote Virtual Disk Protocol
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IPProtoIPPC IPProto = 67 // Internet Pluribus Packet Core
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IPProtoSATMON IPProto = 69 // SATNET Monitoring
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IPProtoVISA IPProto = 70 // VISA Protocol
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IPProtoIPCV IPProto = 71 // Internet Packet Core Utility
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IPProtoCPNX IPProto = 72 // Computer Protocol Network Executive
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IPProtoCPHB IPProto = 73 // Computer Protocol Heart Beat
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IPProtoWSN IPProto = 74 // Wang Span Network
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IPProtoPVP IPProto = 75 // Packet Video Protocol
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IPProtoBRSATMON IPProto = 76 // Backroom SATNET Monitoring
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IPProtoSUNND IPProto = 77 // SUN ND PROTOCOL-Temporary
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IPProtoWBMON IPProto = 78 // WIDEBAND Monitoring
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IPProtoWBEXPAK IPProto = 79 // WIDEBAND EXPAK
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IPProtoISOIP IPProto = 80 // ISO Internet Protocol
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IPProtoVMTP IPProto = 81 // VMTP
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IPProtoSECUREVMTP IPProto = 82 // SECURE-VMTP
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IPProtoVINES IPProto = 83 // VINES
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IPProtoTTP IPProto = 84 // TTP
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IPProtoNSFNETIGP IPProto = 85 // NSFNET-IGP
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IPProtoDGP IPProto = 86 // Dissimilar Gateway Protocol
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IPProtoTCF IPProto = 87 // TCF
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IPProtoEIGRP IPProto = 88 // EIGRP
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IPProtoOSPFIGP IPProto = 89 // OSPFIGP
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IPProtoSpriteRPC IPProto = 90 // Sprite RPC Protocol
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IPProtoLARP IPProto = 91 // Locus Address Resolution Protocol
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IPProtoMTP IPProto = 92 // Multicast Transport Protocol
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IPProtoAX25 IPProto = 93 // AX.25 Frames
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IPProtoIPIP IPProto = 94 // IP-within-IP Encapsulation Protocol
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IPProtoMICP IPProto = 95 // Mobile Internetworking Control Pro.
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IPProtoSCCSP IPProto = 96 // Semaphore Communications Sec. Pro.
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IPProtoETHERIP IPProto = 97 // Ethernet-within-IP Encapsulation
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IPProtoENCAP IPProto = 98 // Encapsulation Header
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IPProtoGMTP IPProto = 100 // GMTP
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IPProtoIFMP IPProto = 101 // Ipsilon Flow Management Protocol
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IPProtoPNNI IPProto = 102 // PNNI over IP
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IPProtoPIM IPProto = 103 // Protocol Independent Multicast
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IPProtoARIS IPProto = 104 // ARIS
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IPProtoSCPS IPProto = 105 // SCPS
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IPProtoQNX IPProto = 106 // QNX
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IPProtoAN IPProto = 107 // Active Networks
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IPProtoIPComp IPProto = 108 // IP Payload Compression Protocol
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IPProtoSNP IPProto = 109 // Sitara Networks Protocol
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IPProtoCompaqPeer IPProto = 110 // Compaq Peer Protocol
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IPProtoIPXInIP IPProto = 111 // IPX in IP
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IPProtoVRRP IPProto = 112 // Virtual Router Redundancy Protocol
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IPProtoPGM IPProto = 113 // PGM Reliable Transport Protocol
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IPProtoL2TP IPProto = 115 // Layer Two Tunneling Protocol v3
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IPProtoDDX IPProto = 116 // D-II Data Exchange (DDX)
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IPProtoIATP IPProto = 117 // Interactive Agent Transfer Protocol
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IPProtoSTP IPProto = 118 // Schedule Transfer Protocol
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IPProtoSRP IPProto = 119 // SpectraLink Radio Protocol
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IPProtoUTI IPProto = 120 // UTI
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IPProtoSMP IPProto = 121 // Simple Message Protocol
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IPProtoSM IPProto = 122 // SM
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IPProtoPTP IPProto = 123 // Performance Transparency Protocol
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IPProtoISIS IPProto = 124 // ISIS over IPv4
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IPProtoFIRE IPProto = 125 // FIRE
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IPProtoCRTP IPProto = 126 // Combat Radio Transport Protocol
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IPProtoCRUDP IPProto = 127 // Combat Radio User Datagram
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IPProtoSSCOPMCE IPProto = 128 // SSCOPMCE
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IPProtoIPLT IPProto = 129 // IPLT
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IPProtoSPS IPProto = 130 // Secure Packet Shield
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IPProtoPIPE IPProto = 131 // Private IP Encapsulation within IP
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IPProtoSCTP IPProto = 132 // Stream Control Transmission Protocol
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IPProtoFC IPProto = 133 // Fibre Channel
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IPProtoRSVP_E2E_IGNORE IPProto = 134 // RSVP-E2E-IGNORE
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IPProtoMobilityHeader IPProto = 135 // Mobility Header
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IPProtoUDPLite IPProto = 136 // UDPLite
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IPProtoMPLSInIP IPProto = 137 // MPLS-in-IP
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IPProtoMANET IPProto = 138 // MANET Protocols
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IPProtoHIP IPProto = 139 // Host Identity Protocol
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IPProtoShim6 IPProto = 140 // Shim6 Protocol
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IPProtoWESP IPProto = 141 // Wrapped Encapsulating Security Payload
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IPProtoROHC IPProto = 142 // Robust Header Compression
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IPProtoEthernet IPProto = 143 // Ethernet
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IPProtoAGGFRAG IPProto = 144 // AGGFRAG Encapsulation payload for ESP
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IPProtoNSH IPProto = 145 // Network Service Header
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)
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// ARPOp represents the type of ARP packet, either request or reply/response.
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type ARPOp uint8
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const (
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ARPRequest ARPOp = 1 // request
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ARPReply ARPOp = 2 // reply
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)
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