2d14045224
The new kernel syncer is cleanly split between generic UNIX module and OS dependent submodules: - krt.c (the generic part) - krt-iface (low-level functions for interface handling) - krt-scan (low-level functions for routing table scanning) - krt-set (low-level functions for setting of kernel routes) krt-set and krt-iface are common for all BSD-like Unices, krt-scan is heavily system dependent (most Unices require /dev/kmem parsing, Linux uses /proc), Netlink substitues all three modules. We expect each UNIX port supports kernel routing table scanning, kernel interface table scanning, kernel route manipulation and possibly also asynchronous event notifications (new route, interface state change; not implemented yet) and build the KRT protocol on the top of these primitive operations.
95 lines
3 KiB
Plaintext
95 lines
3 KiB
Plaintext
Core
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- TOS not supported by kernel -> automatically drop routes with TOS<>0
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- config: executable config files
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- config: define ipaddr constants?
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- config: better default protocol names
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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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- device: what to do if we need to shut down this protocol?
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- adding of route: check whether all bits not covered by masklen are zero
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- incoming packets: interface the packet came from? (esp. for multicasts)
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- broadcast/multicast echoing suppresion
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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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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's by expr's
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- try compiling with -Wunused
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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)
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