From 19a6551de2b02c9b56483a34fdcc0fcc36dcc979 Mon Sep 17 00:00:00 2001
From: Matthias Radestock <matthias.radestock@gmail.com>
Date: Tue, 20 Jun 2017 08:49:38 +0100
Subject: [PATCH] ignore local IPv6 addresses/networks

There is no point in paying attention to them since scope connection
tracking only deals in IPv4.
---
 probe/host/reporter.go |  5 ++---
 report/networks.go     | 18 ++++--------------
 2 files changed, 6 insertions(+), 17 deletions(-)

diff --git a/probe/host/reporter.go b/probe/host/reporter.go
index 3aff7a602..927b57ce4 100644
--- a/probe/host/reporter.go
+++ b/probe/host/reporter.go
@@ -93,9 +93,8 @@ var GetLocalNetworks = func() ([]*net.IPNet, error) {
 	}
 	localNets := report.Networks{}
 	for _, addr := range addrs {
-		// Not all addrs are IPNets.
-		if ipNet, ok := addr.(*net.IPNet); ok {
-			localNets = append(localNets, ipNet)
+		if ipnet, ok := addr.(*net.IPNet); ok && ipnet.IP.To4() != nil {
+			localNets = append(localNets, ipnet)
 		}
 	}
 	return localNets, nil
diff --git a/report/networks.go b/report/networks.go
index 42efd5e4b..f7e2fde39 100644
--- a/report/networks.go
+++ b/report/networks.go
@@ -52,12 +52,9 @@ func LocalAddresses() ([]net.IP, error) {
 		}
 
 		for _, addr := range addrs {
-			ipnet, ok := addr.(*net.IPNet)
-			if !ok {
-				continue
+			if ipnet, ok := addr.(*net.IPNet); ok && ipnet.IP.To4() != nil {
+				result = append(result, ipnet.IP)
 			}
-
-			result = append(result, ipnet.IP)
 		}
 	}
 
@@ -78,16 +75,9 @@ func AddLocalBridge(name string) error {
 		return err
 	}
 	for _, addr := range addrs {
-		_, network, err := net.ParseCIDR(addr.String())
-		if err != nil {
-			return err
+		if ipnet, ok := addr.(*net.IPNet); ok && ipnet.IP.To4() != nil {
+			LocalNetworks = append(LocalNetworks, ipnet)
 		}
-
-		if network == nil {
-			continue
-		}
-
-		LocalNetworks = append(LocalNetworks, network)
 	}
 
 	return nil