Tweak definition of a permanent IPv6 address on Linux.

The linux kernel treats all addresses with a limited lifetime as being
non permanent, but when taking over the prefix livetimes from
upstream assigned prefixes through DHCP, addresses will always have a limited
lifetime.

Still reject temporary addresses, as they indicate autoconfigured
interfaces.

Contributed by T-Labs, Deutsche Telekom Innovation Laboratories

Signed-off-by: Jonas Gorski<jogo@openwrt.org>

src/netlink.c

@@ -264,10 +264,10 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 		    
 		    if (ifa->ifa_flags & IFA_F_DEPRECATED)
 		      flags |= IFACE_DEPRECATED;
-
-		    if (ifa->ifa_flags & IFA_F_PERMANENT)
-		      flags |= IFACE_PERMANENT;
 		    
+		    if (!(ifa->ifa_flags & IFA_F_TEMPORARY))
+		      flags |= IFACE_PERMANENT;
+    		    
 		    if (addrp && callback_ok)
 		      if (!((*callback)(addrp, (int)(ifa->ifa_prefixlen), (int)(ifa->ifa_scope), 
 					(int)(ifa->ifa_index), flags,