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-rw-r--r--pkg/tcpip/transport/packet/endpoint.go21
1 files changed, 20 insertions, 1 deletions
diff --git a/pkg/tcpip/transport/packet/endpoint.go b/pkg/tcpip/transport/packet/endpoint.go
index 5722815e9..09a1cd436 100644
--- a/pkg/tcpip/transport/packet/endpoint.go
+++ b/pkg/tcpip/transport/packet/endpoint.go
@@ -76,6 +76,7 @@ type endpoint struct {
sndBufSize int
closed bool
stats tcpip.TransportEndpointStats `state:"nosave"`
+ bound bool
}
// NewEndpoint returns a new packet endpoint.
@@ -125,6 +126,7 @@ func (ep *endpoint) Close() {
}
ep.closed = true
+ ep.bound = false
ep.waiterQueue.Notify(waiter.EventHUp | waiter.EventErr | waiter.EventIn | waiter.EventOut)
}
@@ -216,7 +218,24 @@ func (ep *endpoint) Bind(addr tcpip.FullAddress) *tcpip.Error {
// sll_family (should be AF_PACKET), sll_protocol, and sll_ifindex."
// - packet(7).
- return tcpip.ErrNotSupported
+ ep.mu.Lock()
+ defer ep.mu.Unlock()
+
+ if ep.bound {
+ return tcpip.ErrAlreadyBound
+ }
+
+ // Unregister endpoint with all the nics.
+ ep.stack.UnregisterPacketEndpoint(0, ep.netProto, ep)
+
+ // Bind endpoint to receive packets from specific interface.
+ if err := ep.stack.RegisterPacketEndpoint(addr.NIC, ep.netProto, ep); err != nil {
+ return err
+ }
+
+ ep.bound = true
+
+ return nil
}
// GetLocalAddress implements tcpip.Endpoint.GetLocalAddress.