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42 lines
1.0 KiB
Go
42 lines
1.0 KiB
Go
//go:build linux && !android
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package systemops
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import (
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"errors"
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"net"
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"syscall"
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"testing"
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"github.com/stretchr/testify/require"
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"github.com/vishvananda/netlink"
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)
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// ensureIPv6DefaultRoute installs a low-preference IPv6 default route via the
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// loopback interface so route lookups for global IPv6 prefixes resolve in
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// environments without v6 connectivity. Any pre-existing default route wins
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// because of its lower metric.
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func ensureIPv6DefaultRoute(t *testing.T) {
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t.Helper()
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lo, err := netlink.LinkByName("lo")
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require.NoError(t, err, "find loopback interface")
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route := &netlink.Route{
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Dst: &net.IPNet{IP: net.IPv6zero, Mask: net.CIDRMask(0, 128)},
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LinkIndex: lo.Attrs().Index,
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Priority: 1 << 20,
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}
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if err := netlink.RouteAdd(route); err != nil {
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if errors.Is(err, syscall.EEXIST) {
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return
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}
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t.Skipf("install IPv6 fallback default route: %v", err)
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}
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t.Cleanup(func() {
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if err := netlink.RouteDel(route); err != nil && !errors.Is(err, syscall.ESRCH) {
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t.Logf("delete IPv6 fallback default route: %v", err)
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}
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})
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}
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