mirror of
https://github.com/yggdrasil-network/water.git
synced 2025-05-19 16:35:10 +03:00
48 lines
1.2 KiB
Go
48 lines
1.2 KiB
Go
package waterutil
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import (
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"net"
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)
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type Tagging int
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// Indicating whether/how a MAC frame is tagged. The value is number of bytes taken by tagging.
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const (
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NotTagged Tagging = 0
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Tagged Tagging = 4
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DoubleTagged Tagging = 8
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)
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func MACDestination(macFrame []byte) net.HardwareAddr {
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return net.HardwareAddr(macFrame[:6])
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}
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func MACSource(macFrame []byte) net.HardwareAddr {
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return net.HardwareAddr(macFrame[6:12])
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}
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func MACTagging(macFrame []byte) Tagging {
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if macFrame[12] == 0x81 && macFrame[13] == 0x00 {
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return Tagged
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} else if macFrame[12] == 0x88 && macFrame[13] == 0xa8 {
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return DoubleTagged
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}
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return NotTagged
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}
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func MACEthertype(macFrame []byte) Ethertype {
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ethertypePos := 12 + MACTagging(macFrame)
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return Ethertype{macFrame[ethertypePos], macFrame[ethertypePos+1]}
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}
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func MACPayload(macFrame []byte) []byte {
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return macFrame[12+MACTagging(macFrame)+2:]
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}
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func IsBroadcast(addr net.HardwareAddr) bool {
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return addr[0] == 0xff && addr[1] == 0xff && addr[2] == 0xff && addr[3] == 0xff && addr[4] == 0xff && addr[5] == 0xff
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}
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func IsIPv4Multicast(addr net.HardwareAddr) bool {
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return addr[0] == 0x01 && addr[1] == 0x00 && addr[2] == 0x5e
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}
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