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iof-bird-daemon / TODO @ 9a158361

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Core
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~~~~
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* protocols: implement dumping of protocol-dependent rte attributes
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- io.c: refuse old-style multicasts for unnumbered interfaces?
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- prefer loopback addresses as router IDs (dummy interface?)
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- config: executable config files
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- do we really need preconfig?
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- counters (according to SNMP MIB?)
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- better memory allocators
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- default preferences of protocols: prefer BGP over OSPF/RIP external routes?
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- secondary addresses -> subinterfaces or ignore
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- static: check validity of route destination?
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- device: configuration of interface patterns
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- adding of route: check whether all bits not covered by masklen are zero
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- netlink: import Linux route attributes to our rta's, so that they can be filtered?
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- iface: when seen an invalid broadcast, fix it up or at least report
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- iface: we always need ifindex at least for PtP links (OSPF)
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- iface: interface filters should support filtering by IP address as well
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- socket: Use IP_RECVERR for BGP TCP sockets?
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Cleanup
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~~~~~~~
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- right usage of DBG vs. debug
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- cleanup debugging calls
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- logging and tracing; use appropriate log levels
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- check incoming packets and log errors!!
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- check log calls for trailing newlines
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- check if all protocols set proper packet priorities and TTL's.
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- replace all NUM, IPA and expr tokens by constant filter expressions
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- try compiling with -Wunused
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- does everybody test return value of sk_open?
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Various ideas
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~~~~~~~~~~~~~
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- real multipath (doesn't seem to be simple at all :()
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- fake multipath (even less simple)
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- route recalculation timing and flap dampening [see RFC2439 for algorithms]
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- aggregate engine: standard route aggregation and summarization
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- aggregate engine: injection of manually configured pseudo-static routes
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- generate default route if any working BGP connection exists (aggregate engine again?)
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- generate default route to IGP's (aggregate engine yet another time?)
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RIP
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~~~
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	- RIP: export-only and import-only mode?
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	- drop RIPv1 (Historic protocol)?
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	- Route Tag
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	- limit routing table xfer (frequency, only to neighbors)
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	- multicast on/off (per interface)
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OSPF
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~~~~
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	- importing of device routes for networks where we don't run OSPF
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	- check incoming packets using neighbor cache
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	- stub area: either no external routes or only default route
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	- RFC2328 appendix E: Use a better algorithm
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	- automatic generation of external route tags (RFC1403)
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	- RFC1587 NSSA areas
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	- RFC2370 opaque LSA's
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	- RFC1793 Demand Circuit Support ??
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	- respect interface MTU and try not to create larger packets unless unavoidable
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BGP
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~~~
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	- in, local, out RIB
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	- maxsize=4096
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	- detection of loops
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	- aggregation, ATOMIC_AGGREGATE
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	- communities
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	- confederations
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	- attributes must be sorted!
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	- re-export of NEXT_HOP attribute
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	- BGP session over currently down interface
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	- LOCAL_PREF attribute
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	- error notification received -> log error
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	- set TTL to 1 (configurable?)
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	- consulting IGP for next-hop information? (what if it changes?)
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	- inter-advertisement delay???!
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	- normalize (sort) incoming AS-SET's
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	- maximum length of AS paths
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	- expected neighbor AS
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	- hold time
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	- idle timer after error: initial value, exponential growth, maximum value
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	- import of IGP routes (use external route tags from OSPF)