copy PERM ARP entries from namespace on boot

copy and setup PERMANENT (static) ARP entries
from CNI namespace to the sandbox

Fixes #3301

1 files changed, 11 insertions, 0 deletions

diff --git a/runsc/boot/network.go b/runsc/boot/network.go
index 9fb3ebd95..00595a95f 100644
--- a/runsc/boot/network.go
+++ b/runsc/boot/network.go
@@ -78,6 +78,11 @@ type DefaultRoute struct {
 	Name  string
 }
 
+type Neighbor struct {
+	IP net.IP
+	HardwareAddr net.HardwareAddr
+}
+
 // FDBasedLink configures an fd-based link.
 type FDBasedLink struct {
 	Name               string
@@ -90,6 +95,7 @@ type FDBasedLink struct {
 	RXChecksumOffload  bool
 	LinkAddress        net.HardwareAddr
 	QDisc              config.QueueingDiscipline
+	Neighbors          []Neighbor
 
 	// NumChannels controls how many underlying FD's are to be used to
 	// create this endpoint.
@@ -241,6 +247,11 @@ func (n *Network) CreateLinksAndRoutes(args *CreateLinksAndRoutesArgs, _ *struct
 			}
 			routes = append(routes, route)
 		}
+
+		for _, neigh := range link.Neighbors {
+			proto, tcpipAddr := ipToAddressAndProto(neigh.IP)
+			n.Stack.AddStaticNeighbor(nicID, proto, tcpipAddr, tcpip.LinkAddress(neigh.HardwareAddr))
+		}
 	}
 
 	if !args.Defaultv4Gateway.Route.Empty() {