wintun: Read/write packet size from/to exchange buffer directly
Driver <-> user-space communication is local and using native endian. Signed-off-by: Simon Rozman <simon@rozman.si>
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@ -6,10 +6,10 @@
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package tun
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import (
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"encoding/binary"
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"errors"
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"os"
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"sync"
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"unsafe"
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"golang.org/x/sys/windows"
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"golang.zx2c4.com/wireguard/tun/wintun"
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@ -230,7 +230,7 @@ func (tun *nativeTun) Read(buff []byte, offset int) (int, error) {
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if tun.rdBuff.offset+packetExchangeAlignment <= tun.rdBuff.avail {
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// Get packet from the exchange buffer.
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packet := tun.rdBuff.data[tun.rdBuff.offset:]
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size := binary.LittleEndian.Uint32(packet[:4])
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size := *(*uint32)(unsafe.Pointer(&packet[0]))
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pSize := packetAlign(packetExchangeAlignment + size)
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if packetSizeMax < size || tun.rdBuff.avail < tun.rdBuff.offset+pSize {
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// Invalid packet size.
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@ -332,7 +332,7 @@ func (tun *nativeTun) putTunPacket(buff []byte) error {
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// Write packet to the exchange buffer.
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packet := tun.wrBuff.data[tun.wrBuff.offset : tun.wrBuff.offset+pSize]
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binary.LittleEndian.PutUint32(packet[:4], size)
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*(*uint32)(unsafe.Pointer(&packet[0])) = size
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copy(packet[packetExchangeAlignment:packetExchangeAlignment+size], buff)
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tun.wrBuff.packetNum++
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