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internal/poll: disable SIO_UDP_NETRESET on Windows 

Disable the reception of NET_UNREACHABLE (TTL expired) message reporting
on UDP sockets to match the default behavior of sockets on other
plaforms.

See https://learn.microsoft.com/en-us/windows/win32/winsock/winsock-ioctls#sio_udp_netreset

This is similar to, but a different case from the prior change 3114bd6 /
https://golang.org/issue/5834 that disabled one of the two flags
influencing behavior in response to the reception of related ICMP.

Updates #5834
Updates #68614
This commit is contained in:
James Tucker 2025-04-10 09:25:13 -07:00 committed by James Tucker
parent 2c35900fe4
commit 78f073bac2
No known key found for this signature in database
2 changed files with 11 additions and 0 deletions
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2
src/internal/syscall/windows/types_windows.go
View File

@ -14,6 +14,8 @@ const (
TCP_KEEPIDLE = 0x03
TCP_KEEPCNT = 0x10
TCP_KEEPINTVL = 0x11
SIO_UDP_NETRESET = syscall.IOC_IN | syscall.IOC_VENDOR | 15
)
const (

9
src/net/fd_windows.go
View File

@ -67,6 +67,15 @@ func (fd *netFD) init() error {
if err != nil {
return wrapSyscallError("wsaioctl", err)
}
// Disable reporting of NET_UNREACHABLE errors.
// See https://go.dev/issue/68614.
ret = 0
flag = 0
size = uint32(unsafe.Sizeof(flag))
err = syscall.WSAIoctl(fd.pfd.Sysfd, windows.SIO_UDP_NETRESET, (*byte)(unsafe.Pointer(&flag)), size, nil, 0, &ret, nil, 0)
if err != nil {
return wrapSyscallError("wsaioctl", err)
}
}
return nil
}