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added some functions for TAP that detect whether a MAC address is a broadcast or IPv4 multicast address

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This commit is contained in:
Song Gao
2013-03-30 19:51:57 -05:00
parent 06bc3cd87f
commit 0195689109
1 changed files with 8 additions and 0 deletions
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8
waterutil/tap.go
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@@ -38,3 +38,11 @@ func MACEthertype(macFrame []byte) Ethertype {
func MACPayload(macFrame []byte) []byte {
return macFrame[12+MACTagging(macFrame)+2:]
}
func IsBroadcast(addr net.HardwareAddr) bool {
return addr[0] == 0xff && addr[1] == 0xff && addr[2] == 0xff && addr[3] == 0xff && addr[4] == 0xff && addr[5] == 0xff
}
func IsIPv4Multicast(addr net.HardwareAddr) bool {
return addr[0] == 0x01 && addr[1] == 0x00 && addr[2] == 0x5e
}