Files
gluetun/internal/netlink/ipv6.go
Quentin McGaw 40cdb4f662 fix(netlink): RouteList list routes from all tables
- Do not filter by link anymore
- IPv6 detection simplified
2023-06-08 09:12:46 +00:00

33 lines
948 B
Go

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