From 6397414f52df7d224fb4bf05024715f3b8f88c25 Mon Sep 17 00:00:00 2001
From: Mikael Magnusson <mikma@users.sourceforge.net>
Date: Tue, 21 Jan 2020 21:13:27 +0000
Subject: Implement weak host model

Use weak host model if forwarding is enabled.
---
 pkg/tcpip/stack/nic.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go
index 133e6e76b..63c31aef4 100644
--- a/pkg/tcpip/stack/nic.go
+++ b/pkg/tcpip/stack/nic.go
@@ -1238,6 +1238,14 @@ func (n *NIC) DeliverNetworkPacket(linkEP LinkEndpoint, remote, local tcpip.Link
 	//
 	// TODO: Should we be forwarding the packet even if promiscuous?
 	if n.stack.Forwarding() {
+		// Implement weak host model when forwarding is enabled
+		for _, nic := range n.stack.nics {
+			if ref := nic.getRef(protocol, dst); ref != nil {
+				handlePacket(n, protocol, dst, src, linkEP.LinkAddress(), remote, ref, pkt)
+				return
+			}
+		}
+
 		r, err := n.stack.FindRoute(0, "", dst, protocol, false /* multicastLoop */)
 		if err != nil {
 			n.stack.stats.IP.InvalidDestinationAddressesReceived.Increment()
-- 
cgit v1.2.3