|
|
|
@ -1059,15 +1059,10 @@ func (ns *Impl) acceptUDP(r *udp.ForwarderRequest) {
|
|
|
|
|
go ns.forwardUDP(c, srcAddr, dstAddr)
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Buffer pool for forwarding UDP packets.
|
|
|
|
|
var udpBufPool = &sync.Pool{
|
|
|
|
|
New: func() any {
|
|
|
|
|
b := make([]byte, maxUDPPacketSize)
|
|
|
|
|
return &b
|
|
|
|
|
},
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (ns *Impl) handleMagicDNSUDP(srcAddr netip.AddrPort, c *gonet.UDPConn) {
|
|
|
|
|
// In practice, implementations are advised not to exceed 512 bytes
|
|
|
|
|
// due to fragmenting. Just to be sure, we bump all the way to the MTU.
|
|
|
|
|
var maxUDPReqSize = tstun.DefaultMTU()
|
|
|
|
|
// Packets are being generated by the local host, so there should be
|
|
|
|
|
// very, very little latency. 150ms was chosen as something of an upper
|
|
|
|
|
// bound on resource usage, while hopefully still being long enough for
|
|
|
|
@ -1075,10 +1070,7 @@ func (ns *Impl) handleMagicDNSUDP(srcAddr netip.AddrPort, c *gonet.UDPConn) {
|
|
|
|
|
const readDeadline = 150 * time.Millisecond
|
|
|
|
|
|
|
|
|
|
defer c.Close()
|
|
|
|
|
|
|
|
|
|
bufp := udpBufPool.Get().(*[]byte)
|
|
|
|
|
defer udpBufPool.Put(bufp)
|
|
|
|
|
q := *bufp
|
|
|
|
|
q := make([]byte, maxUDPReqSize)
|
|
|
|
|
|
|
|
|
|
// libresolv from glibc is quite adamant that transmitting multiple DNS
|
|
|
|
|
// requests down the same UDP socket is valid. To support this, we read
|
|
|
|
@ -1191,11 +1183,7 @@ func startPacketCopy(ctx context.Context, cancel context.CancelFunc, dst net.Pac
|
|
|
|
|
}
|
|
|
|
|
go func() {
|
|
|
|
|
defer cancel() // tear down the other direction's copy
|
|
|
|
|
|
|
|
|
|
bufp := udpBufPool.Get().(*[]byte)
|
|
|
|
|
defer udpBufPool.Put(bufp)
|
|
|
|
|
pkt := *bufp
|
|
|
|
|
|
|
|
|
|
pkt := make([]byte, maxUDPPacketSize)
|
|
|
|
|
for {
|
|
|
|
|
select {
|
|
|
|
|
case <-ctx.Done():
|
|
|
|
|