Basic support for IPv6. The system-dependent part doesn't work yet,

but the core routines are there and seem to be working.

   o  lib/ipv6.[ch] written
   o  Lexical analyser recognizes IPv6 addresses and when in IPv6
      mode, treats pure IPv4 addresses as router IDs.
   o  Router ID must be configured manually on IPv6 systems.
   o  Added SCOPE_ORGANIZATION for org-scoped IPv6 multicasts.
   o  Fixed few places where ipa_(hton|ntoh) was called as a function
      returning converted address.

TODO

@@ -14,8 +14,7 @@ Core
 - default preferences of protocols: prefer BGP over OSPF/RIP external routes?
 
 - static: check validity of route destination?
-
-- device: configuration of interface patterns
+- static: allow specifying a per-route filter program for setting route attributes?
 
 - rte_update: check whether all bits not covered by masklen are zero
 - rte_update: debug mode
@@ -31,6 +30,7 @@ Core
 - config: executable config files
 - config: when parsing prefix, check zero bits
 - config: reconfiguration
+- config: useless rules when protocols disabled
 
 - krt: rescan interfaces when route addition fails?
 - krt: does PERSIST mode have any sense if kernel syncer is shut down as last?
@@ -53,47 +53,41 @@ Cleanup
 - replace all NUM, IPA and expr tokens by constant filter expressions
 - try compiling with -Wunused
 - does everybody test return value of sk_open?
+- add references to RFC's we did follow
 
 Various ideas
 ~~~~~~~~~~~~~
 - real multipath (doesn't seem to be simple at all :()
 - fake multipath (even less simple)
 - route recalculation timing and flap dampening [see RFC2439 for algorithms]
-- aggregate engine: standard route aggregation and summarization
+- aggregate engine: standard route aggregation and summarization [RFC2519]
 - aggregate engine: injection of manually configured pseudo-static routes
 - generate default route if any working BGP connection exists (aggregate engine again?)
 - generate default route to IGP's (aggregate engine yet another time?)
+- look at RFC 2386 (QoS-based routing)
 
 
 RIP
 ~~~
-	- RIP: export-only and import-only mode?
+	- export-only and import-only mode?
 	- drop RIPv1 (Historic protocol)?
 	- Route Tag
 	- limit routing table xfer (frequency, only to neighbors)
-	- multicast on/off (per interface)
 
 OSPF
 ~~~~
 	- importing of device routes for networks where we don't run OSPF
 	- check incoming packets using neighbor cache
-	- stub area: either no external routes or only default route
 	- RFC2328 appendix E: Use a better algorithm
 	- automatic generation of external route tags (RFC1403)
 	- RFC1587 NSSA areas
 	- RFC2370 opaque LSA's
-	- RFC1793 Demand Circuit Support ??
 	- respect interface MTU and try not to create larger packets unless unavoidable
 
-
 BGP
 ~~~
-	- in, local, out RIB
-	- maxsize=4096
-	- detection of loops
 	- aggregation, ATOMIC_AGGREGATE
 	- communities
-	- confederations
 	- attributes must be sorted!
 	- re-export of NEXT_HOP attribute
 	- BGP session over currently down interface
@@ -104,7 +98,6 @@ BGP
 	- inter-advertisement delay???!
 	- normalize (sort) incoming AS-SET's
 	- maximum length of AS paths
-
 	- expected neighbor AS
 	- hold time
 	- idle timer after error: initial value, exponential growth, maximum value