diff options
Diffstat (limited to 'vendor/k8s.io/apimachinery/pkg/util/net/interface.go')
-rw-r--r-- | vendor/k8s.io/apimachinery/pkg/util/net/interface.go | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/vendor/k8s.io/apimachinery/pkg/util/net/interface.go b/vendor/k8s.io/apimachinery/pkg/util/net/interface.go index 204e223ca..9adf4cfe4 100644 --- a/vendor/k8s.io/apimachinery/pkg/util/net/interface.go +++ b/vendor/k8s.io/apimachinery/pkg/util/net/interface.go @@ -266,6 +266,36 @@ func getIPFromInterface(intfName string, forFamily AddressFamily, nw networkInte return nil, nil } +// getIPFromLoopbackInterface gets the IPs on a loopback interface and returns a global unicast address, if any. +// The loopback interface must be up, the IP must in the family requested, and the IP must be a global unicast address. +func getIPFromLoopbackInterface(forFamily AddressFamily, nw networkInterfacer) (net.IP, error) { + intfs, err := nw.Interfaces() + if err != nil { + return nil, err + } + for _, intf := range intfs { + if !isInterfaceUp(&intf) { + continue + } + if intf.Flags&(net.FlagLoopback) != 0 { + addrs, err := nw.Addrs(&intf) + if err != nil { + return nil, err + } + klog.V(4).Infof("Interface %q has %d addresses :%v.", intf.Name, len(addrs), addrs) + matchingIP, err := getMatchingGlobalIP(addrs, forFamily) + if err != nil { + return nil, err + } + if matchingIP != nil { + klog.V(4).Infof("Found valid IPv%d address %v for interface %q.", int(forFamily), matchingIP, intf.Name) + return matchingIP, nil + } + } + } + return nil, nil +} + // memberOf tells if the IP is of the desired family. Used for checking interface addresses. func memberOf(ip net.IP, family AddressFamily) bool { if ip.To4() != nil { @@ -393,8 +423,9 @@ func getAllDefaultRoutes() ([]Route, error) { } // chooseHostInterfaceFromRoute cycles through each default route provided, looking for a -// global IP address from the interface for the route. addressFamilies determines whether it -// prefers IPv4 or IPv6 +// global IP address from the interface for the route. If there are routes but no global +// address is obtained from the interfaces, it checks if the loopback interface has a global address. +// addressFamilies determines whether it prefers IPv4 or IPv6 func chooseHostInterfaceFromRoute(routes []Route, nw networkInterfacer, addressFamilies AddressFamilyPreference) (net.IP, error) { for _, family := range addressFamilies { klog.V(4).Infof("Looking for default routes with IPv%d addresses", uint(family)) @@ -411,6 +442,17 @@ func chooseHostInterfaceFromRoute(routes []Route, nw networkInterfacer, addressF klog.V(4).Infof("Found active IP %v ", finalIP) return finalIP, nil } + // In case of network setups where default routes are present, but network + // interfaces use only link-local addresses (e.g. as described in RFC5549). + // the global IP is assigned to the loopback interface, and we should use it + loopbackIP, err := getIPFromLoopbackInterface(family, nw) + if err != nil { + return nil, err + } + if loopbackIP != nil { + klog.V(4).Infof("Found active IP %v on Loopback interface", loopbackIP) + return loopbackIP, nil + } } } klog.V(4).Infof("No active IP found by looking at default routes") |