38 lines
1.0 KiB
Go
38 lines
1.0 KiB
Go
package netlink
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import (
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"fmt"
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)
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func (n *NetLink) IsIPv6Supported() (supported bool, err error) {
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routes, err := n.RouteList(FamilyV6)
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if err != nil {
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return false, fmt.Errorf("listing IPv6 routes: %w", err)
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}
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// Check each route for IPv6 due to Podman bug listing IPv4 routes
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// as IPv6 routes at container start, see:
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// https://github.com/qdm12/gluetun/issues/1241#issuecomment-1333405949
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for _, route := range routes {
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link, err := n.LinkByIndex(route.LinkIndex)
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if err != nil {
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return false, fmt.Errorf("finding link corresponding to route: %w", err)
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}
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sourceIsIPv6 := route.Src.IsValid() && route.Src.Is6()
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destinationIsIPv6 := route.Dst.IsValid() && route.Dst.Addr().Is6()
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switch {
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case !sourceIsIPv6 && !destinationIsIPv6,
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destinationIsIPv6 && route.Dst.Addr().IsLoopback():
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continue
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}
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n.debugLogger.Debugf("IPv6 is supported by link %s", link.Name)
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return true, nil
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}
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n.debugLogger.Debugf("IPv6 is not supported after searching %d routes",
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len(routes))
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return false, nil
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}
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