vppn/peer/header.go
2025-08-26 15:33:27 +02:00

48 lines
897 B
Go

package peer
import "unsafe"
// ----------------------------------------------------------------------------
const (
headerSize = 12
controlHeaderSize = 24
dataHeaderSize = 12
dataStreamID = 1
controlStreamID = 2
)
type Header struct {
Version byte
StreamID byte
SourceIP byte
DestIP byte
Counter uint64 // Init with time.Now().Unix << 30 to ensure monotonic.
}
func parseHeader(b []byte) (h Header) {
h.Version = b[0]
h.StreamID = b[1]
h.SourceIP = b[2]
h.DestIP = b[3]
h.Counter = *(*uint64)(unsafe.Pointer(&b[4]))
return h
}
func (h *Header) Parse(b []byte) {
h.Version = b[0]
h.StreamID = b[1]
h.SourceIP = b[2]
h.DestIP = b[3]
h.Counter = *(*uint64)(unsafe.Pointer(&b[4]))
}
func (h *Header) Marshal(buf []byte) {
buf[0] = h.Version
buf[1] = h.StreamID
buf[2] = h.SourceIP
buf[3] = h.DestIP
*(*uint64)(unsafe.Pointer(&buf[4])) = h.Counter
}