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soypat
79 lines
3.5 KiB
Go
79 lines
3.5 KiB
Go
package ethernet
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const (
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sizeHeaderNoVLAN = 14
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)
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func BroadcastAddr() [6]byte {
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return [6]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
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}
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//go:generate stringer -type=Type -linecomment -output stringers.go .
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type Type 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 Type) IsSize() bool { return et <= 1500 }
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// Ethernet type flags
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const (
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TypeIPv4 Type = 0x0800 // IPv4
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TypeARP Type = 0x0806 // ARP
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TypeWakeOnLAN Type = 0x0842 // wake on LAN
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TypeTRILL Type = 0x22F3 // TRILL
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TypeDECnetPhase4 Type = 0x6003 // DECnetPhase4
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TypeRARP Type = 0x8035 // RARP
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TypeAppleTalk Type = 0x809B // AppleTalk
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TypeAARP Type = 0x80F3 // AARP
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TypeIPX1 Type = 0x8137 // IPx1
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TypeIPX2 Type = 0x8138 // IPx2
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TypeQNXQnet Type = 0x8204 // QNXQnet
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TypeIPv6 Type = 0x86DD // IPv6
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TypeEthernetFlowControl Type = 0x8808 // EthernetFlowCtl
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TypeIEEE802_3 Type = 0x8809 // IEEE802.3
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TypeCobraNet Type = 0x8819 // CobraNet
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TypeMPLSUnicast Type = 0x8847 // MPLS Unicast
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TypeMPLSMulticast Type = 0x8848 // MPLS Multicast
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TypePPPoEDiscovery Type = 0x8863 // PPPoE discovery
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TypePPPoESession Type = 0x8864 // PPPoE session
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TypeJumboFrames Type = 0x8870 // jumbo frames
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TypeHomePlug1_0MME Type = 0x887B // home plug 1 0mme
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TypeIEEE802_1X Type = 0x888E // IEEE 802.1x
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TypePROFINET Type = 0x8892 // profinet
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TypeHyperSCSI Type = 0x889A // hyper SCSI
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TypeAoE Type = 0x88A2 // AoE
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TypeEtherCAT Type = 0x88A4 // EtherCAT
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TypeEthernetPowerlink Type = 0x88AB // Ethernet powerlink
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TypeLLDP Type = 0x88CC // LLDP
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TypeSERCOS3 Type = 0x88CD // SERCOS3
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TypeHomePlugAVMME Type = 0x88E1 // home plug AVMME
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TypeMRP Type = 0x88E3 // MRP
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TypeIEEE802_1AE Type = 0x88E5 // IEEE 802.1ae
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TypeIEEE1588 Type = 0x88F7 // IEEE 1588
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TypeIEEE802_1ag Type = 0x8902 // IEEE 802.1ag
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TypeFCoE Type = 0x8906 // FCoE
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TypeFCoEInit Type = 0x8914 // FCoE init
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TypeRoCE Type = 0x8915 // RoCE
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TypeCTP Type = 0x9000 // CTP
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TypeVeritasLLT Type = 0xCAFE // Veritas LLT
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TypeVLAN Type = 0x8100 // VLAN
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TypeServiceVLAN Type = 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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