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Delay the initialization of ARP/NDP responders
For secondary-network scenarios, the transport interface can be changed after the agent is started. The ARP/NDP responders should be started after the initialization of secondary-network to bind to the transport interface of the new index. Besides, this change also addresses the following issues: - NDP responder may fail to bind to the new interface due to the Duplicate Address Detection process. - Golang caches the zone index for the interface, which may result in NDP responder binding on the stale interface Fixes: #6623 Signed-off-by: Xu Liu <xu.liu@broadcom.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| package responder | ||
|
|
||
| import ( | ||
| "net/netip" | ||
|
|
||
| "k8s.io/apimachinery/pkg/util/sets" | ||
| "k8s.io/klog/v2" | ||
| ) | ||
|
|
||
| var ( | ||
| // map of transportInterfaceName to ARP responder | ||
| arpResponders = make(map[string]*arpResponder) | ||
| // map of transportInterfaceName to NDP responder | ||
| ndpResponders = make(map[string]*ndpResponder) | ||
| ) | ||
|
|
||
| // NewARPResponder creates a new ARP responder if it does not exist for the given transportInterfaceName. | ||
| // This function is not thread-safe. | ||
| func NewARPResponder(transportInterfaceName string) *arpResponder { | ||
| if responder, ok := arpResponders[transportInterfaceName]; ok { | ||
| klog.InfoS("ARP responder already exists", "interface", transportInterfaceName) | ||
| return responder | ||
| } | ||
| a := &arpResponder{ | ||
| ifaceName: transportInterfaceName, | ||
| assignedIPs: sets.New[string](), | ||
| } | ||
| klog.InfoS("Created new ARP responder", "interface", transportInterfaceName) | ||
| arpResponders[transportInterfaceName] = a | ||
| return a | ||
| } | ||
|
|
||
| // NewNDPResponder creates a new NDP responder if it does not exist for the given transportInterfaceName. | ||
| // This function is not thread-safe. | ||
| func NewNDPResponder(transportInterfaceName string) *ndpResponder { | ||
| if responder, ok := ndpResponders[transportInterfaceName]; ok { | ||
| klog.InfoS("NDP responder already exists", "interface", transportInterfaceName) | ||
| return responder | ||
| } | ||
| n := &ndpResponder{ | ||
| ifaceName: transportInterfaceName, | ||
| multicastGroups: make(map[netip.Addr]int), | ||
| assignedIPs: sets.New[netip.Addr](), | ||
| } | ||
| klog.InfoS("Created new NDP responder", "interface", transportInterfaceName) | ||
| ndpResponders[transportInterfaceName] = n | ||
| return n | ||
| } |
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