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wintun: Adopt new packet data alignment

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2019-02-20 19:56:10 +01:00
parent 040da43889
commit 8091c6474a
1 changed files with 10 additions and 10 deletions
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20
tun/tun_windows.go
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@ -16,11 +16,11 @@ import (
)
const (
packetSizeMax uint32 = 0xeffc // Maximum packet size: 4 + packetSizeMax == 0xf000
packetExchangeMax uint32 = 256 // Number of packets that may be written at a time
packetExchangeAlignment uint32 = 16 // Number of bytes packets are aligned to in exchange buffers
packetExchangeSizeRead uint32 = 0x100000 // Read exchange buffer size (defaults to 1MiB)
packetExchangeSizeWrite uint32 = 0x10000 // Write exchange buffer size (defaults to 64kiB)
packetExchangeMax uint32 = 256 // Number of packets that may be written at a time
packetExchangeAlignment uint32 = 16 // Number of bytes packets are aligned to in exchange buffers
packetSizeMax uint32 = 0xf000 - packetExchangeAlignment // Maximum packet size
packetExchangeSizeRead uint32 = 0x100000 // Read exchange buffer size (defaults to 1MiB)
packetExchangeSizeWrite uint32 = 0x10000 // Write exchange buffer size (defaults to 64kiB)
)
type exchgBufRead struct {
@ -228,10 +228,10 @@ func (tun *nativeTun) Read(buff []byte, offset int) (int, error) {
}
for {
if tun.rdBuff.offset+4 <= tun.rdBuff.avail {
if tun.rdBuff.offset+packetExchangeAlignment <= tun.rdBuff.avail {
// Get packet from the exchange buffer.
size := *(*uint32)(unsafe.Pointer(&tun.rdBuff.data[tun.rdBuff.offset]))
pSize := packetAlign(4 + size)
pSize := packetAlign(packetExchangeAlignment + size)
if packetSizeMax < size || tun.rdBuff.avail < tun.rdBuff.offset+pSize {
// Invalid packet size.
tun.rdBuff.avail = 0
@ -239,7 +239,7 @@ func (tun *nativeTun) Read(buff []byte, offset int) (int, error) {
}
// Copy data.
copy(buff[offset:], tun.rdBuff.data[tun.rdBuff.offset+4:][:size])
copy(buff[offset:], tun.rdBuff.data[tun.rdBuff.offset+packetExchangeAlignment:][:size])
tun.rdBuff.offset += pSize
return int(size), nil
}
@ -319,7 +319,7 @@ func (tun *nativeTun) putTunPacket(buff []byte) error {
if size > packetSizeMax {
return errors.New("Packet too big")
}
pSize := packetAlign(4 + size)
pSize := packetAlign(packetExchangeAlignment + size)
if tun.wrBuff.packetNum >= packetExchangeMax || tun.wrBuff.offset+pSize >= packetExchangeSizeWrite {
// Exchange buffer is full -> flush first.
@ -331,7 +331,7 @@ func (tun *nativeTun) putTunPacket(buff []byte) error {
// Write packet to the exchange buffer.
*(*uint32)(unsafe.Pointer(&tun.wrBuff.data[tun.wrBuff.offset])) = size
copy(tun.wrBuff.data[tun.wrBuff.offset+4:][:size], buff)
copy(tun.wrBuff.data[tun.wrBuff.offset+packetExchangeAlignment:][:size], buff)
tun.wrBuff.packetNum++
tun.wrBuff.offset += pSize