mirror of
https://github.com/tailscale/tailscale.git
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59 lines
1.5 KiB
Go
59 lines
1.5 KiB
Go
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build windows
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package magicsock
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import (
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"net"
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"unsafe"
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"golang.org/x/sys/windows"
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"tailscale.com/types/logger"
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"tailscale.com/types/nettype"
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)
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func trySetUDPSocketOptions(pconn nettype.PacketConn, logf logger.Logf) {
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c, ok := pconn.(*net.UDPConn)
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if !ok {
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// not a UDP connection; nothing to do
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return
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}
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sysConn, err := c.SyscallConn()
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if err != nil {
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logf("trySetUDPSocketOptions: getting SyscallConn failed: %v", err)
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return
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}
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// Similar to https://github.com/golang/go/issues/5834 (which involved
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// WSAECONNRESET), Windows can return a WSAENETRESET error, even on UDP
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// reads. Disable this.
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const SIO_UDP_NETRESET = windows.IOC_IN | windows.IOC_VENDOR | 15
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var ioctlErr error
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err = sysConn.Control(func(fd uintptr) {
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ret := uint32(0)
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flag := uint32(0)
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size := uint32(unsafe.Sizeof(flag))
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ioctlErr = windows.WSAIoctl(
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windows.Handle(fd),
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SIO_UDP_NETRESET, // iocc
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(*byte)(unsafe.Pointer(&flag)), // inbuf
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size, // cbif
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nil, // outbuf
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0, // cbob
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&ret, // cbbr
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nil, // overlapped
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0, // completionRoutine
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)
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})
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if ioctlErr != nil {
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logf("trySetUDPSocketOptions: could not set SIO_UDP_NETRESET: %v", ioctlErr)
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}
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if err != nil {
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logf("trySetUDPSocketOptions: SyscallConn.Control failed: %v", err)
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}
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}
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