[NETNS][IPV6] flowlabels - make flowlabels per namespace

This patch introduces a new member, fl_net, in struct ip6_flowlabel.
This allows to create labels with the same value in different namespaces.

Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 1c98e73..296f61d 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -202,6 +202,7 @@
 	u32			owner;
 	unsigned long		lastuse;
 	unsigned long		expires;
+	struct net		*fl_net;
 };
 
 #define IPV6_FLOWINFO_MASK	__constant_htonl(0x0FFFFFFF)