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tun: windows: decrease alignment to 4

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This commit is contained in:
Jason A. Donenfeld 2019-07-05 07:53:19 +02:00
parent 13abbdf14b
commit d8448f8a02
1 changed files with 3 additions and 3 deletions
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6
tun/tun_windows.go
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@ -20,7 +20,7 @@ import (
)
const (
packetExchangeAlignment uint32 = 16 // Number of bytes packets are aligned to in exchange buffers
packetExchangeAlignment uint32 = 4 // Number of bytes packets are aligned to in exchange buffers
packetSizeMax uint32 = 0xf000 - packetExchangeAlignment // Maximum packet size
packetExchangeSize uint32 = 0x100000 // Exchange buffer size (defaults to 1MiB)
retryRate = 4 // Number of retries per second to reopen device pipe
@ -255,7 +255,7 @@ func (tun *NativeTun) Read(buff []byte, offset int) (int, error) {
// Get packet from the exchange buffer.
packet := tun.rdBuff.data[tun.rdBuff.offset:]
size := *(*uint32)(unsafe.Pointer(&packet[0]))
pSize := packetAlign(packetExchangeAlignment + size)
pSize := packetAlign(size) + packetExchangeAlignment
if packetSizeMax < size || tun.rdBuff.avail < tun.rdBuff.offset+pSize {
// Invalid packet size.
tun.rdBuff.avail = 0
@ -363,7 +363,7 @@ func (tun *NativeTun) putTunPacket(buff []byte) error {
if size > packetSizeMax {
return errors.New("Packet too big")
}
pSize := packetAlign(packetExchangeAlignment + size)
pSize := packetAlign(size) + packetExchangeAlignment
if tun.wrBuff.offset+pSize >= packetExchangeSize {
// Exchange buffer is full -> flush first.