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add ipv4 total len in wu

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fumiama
2021-12-31 00:04:39 +08:00
parent 3d68512108
commit 38601da6d1
1 changed files with 5 additions and 0 deletions
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5
waterutil/tun_ipv4.go
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@@ -1,6 +1,7 @@
package waterutil package waterutil
import ( import (
"encoding/binary"
"net" "net"
) )
@@ -12,6 +13,10 @@ func IPv4ECN(packet []byte) byte {
return packet[1] & 0x03 return packet[1] & 0x03
} }
func IPv4TotalLength(packet []byte) uint16 {
return binary.BigEndian.Uint16(packet[2:4])
}
func IPv4Identification(packet []byte) [2]byte { func IPv4Identification(packet []byte) [2]byte {
return [2]byte{packet[4], packet[5]} return [2]byte{packet[4], packet[5]}
} }