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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package neterror
import (
"errors"
"os"
"golang.org/x/sys/unix"
)
func init() {
shouldDisableUDPGSO = func(err error) bool {
var serr *os.SyscallError
if errors.As(err, &serr) {
// EIO is returned by udp_send_skb() if the device driver does not
// have tx checksumming enabled, which is a hard requirement of
// UDP_SEGMENT. See:
// https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/man7/udp.7?id=806eabd74910447f21005160e90957bde4db0183#n228
// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/ipv4/udp.c?h=v6.2&id=c9c3395d5e3dcc6daee66c6908354d47bf98cb0c#n942
return serr.Err == unix.EIO
}
return false
}
}
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