bird/TODO

Core
~~~~
- TOS not supported by kernel -> automatically drop routes with TOS<>0

- config: executable config files
- config: define ipaddr constants?
- config: better default protocol names

- counters (according to SNMP MIB?)
- better memory allocators
- default preferences of protocols: prefer BGP over OSPF/RIP external routes?
- secondary addresses -> subinterfaces or ignore

- static: check validity of route destination?

- device: configuration of interface patterns

- adding of route: check whether all bits not covered by masklen are zero

- incoming packets: interface the packet came from? (esp. for multicasts)
- broadcast/multicast echoing suppresion
- we need ifindex at least for PtP links

- kernel: RTM_F_NOTIFY seems to be unimplemented
- kernel: RTM_DELROUTE not announced for device routes

- netlink: import Linux route attributes to our rta's, so that they can be filtered?

Cleanup
~~~~~~~
- right usage of DBG vs. debug
- cleanup debugging calls
- logging and tracing; use appropriate log levels
- check incoming packets and log errors!!
- check log calls for trailing newlines
- check if all protocols set proper packet priorities and TTL's.
- replace all NUM's by expr's

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: 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?)


RIP
~~~
	- RIP: 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
	- LOCAL_PREF attribute
	- error notification received -> log error
	- set TTL to 1 (configurable?)
	- consulting IGP for next-hop information? (what if it changes?)
	- 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
	- import of IGP routes (use external route tags from OSPF)
First look at data structures. More to come tomorrow... 1998-04-22 20:58:34 +08:00			`Core`
			`~~~~`
We parse /proc/net/route and flag RT entries according to it. More to come today in the morning... 1998-10-19 06:25:56 +08:00			`- TOS not supported by kernel -> automatically drop routes with TOS<>0`
Squashed one bug in timing of route scans. 1999-02-14 03:57:19 +08:00
config->router_id works again. 1999-02-14 02:42:00 +08:00			`- config: executable config files`
Squashed one bug in timing of route scans. 1999-02-14 03:57:19 +08:00			`- config: define ipaddr constants?`
			`- config: better default protocol names`
We parse /proc/net/route and flag RT entries according to it. More to come today in the morning... 1998-10-19 06:25:56 +08:00
First look at data structures. More to come tomorrow... 1998-04-22 20:58:34 +08:00			`- counters (according to SNMP MIB?)`
BIRD library: The story continues. Complete resource manages and IP address handling. 1998-05-04 00:43:39 +08:00			`- better memory allocators`
			`- default preferences of protocols: prefer BGP over OSPF/RIP external routes?`
Pruned the TODO list. 1999-03-02 01:51:29 +08:00			`- secondary addresses -> subinterfaces or ignore`
Hopefully finished kernel syncer (krt) rewrite: o Interface syncing is now a part of krt and it can have configurable parameters. Actually, the only one is scan rate now :) o Kernel routing table syncing is now synchronized with interface syncing (we need the most recent version of the interface list to prevent lots of routes to non-existent destinations from appearing). Instead of its own timer, we just check if it's route scan time after each iface list scan. o Syncing of device routes implemented. o CONFIG_AUTO_ROUTES should control syncing of automatic device routes. o Rewrote krt_remove_route() to really remove routes :) o Better diagnostics. o Fixed a couple of bugs. 1998-12-09 02:37:58 +08:00
All static routes except for device ones should work and appear/disappear when their destination comes on/off link. Deserves better testing :) See example in bird.conf. 1998-12-07 07:13:31 +08:00			`- static: check validity of route destination?`
First look at data structures. More to come tomorrow... 1998-04-22 20:58:34 +08:00
Finer grained logging levels: #define L_DEBUG "\001" /* Debugging messages / #define L_INFO "\002" / Informational messages / #define L_WARN "\003" / Warnings / #define L_ERR "\004" / Errors / #define L_AUTH "\005" / Authorization failed etc. / #define L_FATAL "\006" / Fatal errors / #define L_TRACE "\002" / Protocol tracing / #define L_INFO "\003" / Informational messages / #define L_REMOTE "\004" / Remote protocol errors / #define L_WARN "\004" / Local warnings / #define L_ERR "\005" / Local errors / #define L_AUTH "\006" / Authorization failed etc. / #define L_FATAL "\007" / Fatal errors / #define L_BUG "\010" / BIRD bugs */ Introduced bug() which is like die(), but with level L_BUG. Protocols should _never_ call die() as it should be used only during initialization and on irrecoverable catastrophic events like out of memory. Also introduced ASSERT() which behaves like normal assert(), but it calls bug() when assertion fails. When !defined(DEBUGGING), it gets ignored. 1998-12-20 22:24:35 +08:00			`- device: configuration of interface patterns`

`wc -l TODO` decreased. 1998-11-29 22:51:47 +08:00			`- adding of route: check whether all bits not covered by masklen are zero`
First look at data structures. More to come tomorrow... 1998-04-22 20:58:34 +08:00
Pruned the TODO list. 1999-03-02 01:51:29 +08:00			`- incoming packets: interface the packet came from? (esp. for multicasts)`
			`- broadcast/multicast echoing suppresion`
			`- we need ifindex at least for PtP links`

			`- kernel: RTM_F_NOTIFY seems to be unimplemented`
			`- kernel: RTM_DELROUTE not announced for device routes`

Added skeletal version of Linux netlink interface. It doesn't work yet, but the framework is there and I'll try finish it soon. 1999-03-02 04:17:46 +08:00			`- netlink: import Linux route attributes to our rta's, so that they can be filtered?`

Cleaned up TODO file. That's all for today, midnight gets closer. 1999-02-14 06:13:04 +08:00			`Cleanup`
			`~~~~~~~`
			`- right usage of DBG vs. debug`
			`- cleanup debugging calls`
			`- logging and tracing; use appropriate log levels`
			`- check incoming packets and log errors!!`
			`- check log calls for trailing newlines`
			`- check if all protocols set proper packet priorities and TTL's.`
			`- replace all NUM's by expr's`

			`Various ideas`
			`~~~~~~~~~~~~~`
			`- real multipath (doesn't seem to be simple at all :()`
			`- fake multipath (even less simple)`
Pruned the TODO list. 1999-03-02 01:51:29 +08:00			`- route recalculation timing and flap dampening [see RFC2439 for algorithms]`
Cleaned up TODO file. That's all for today, midnight gets closer. 1999-02-14 06:13:04 +08:00			`- aggregate engine: standard route aggregation and summarization`
			`- 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?)`
First look at data structures. More to come tomorrow... 1998-04-22 20:58:34 +08:00

BIRD library: The story continues. Complete resource manages and IP address handling. 1998-05-04 00:43:39 +08:00			`RIP`
			`~~~`
			`- RIP: export-only and import-only mode?`
			`- drop RIPv1 (Historic protocol)?`
			`- Route Tag`
			`- limit routing table xfer (frequency, only to neighbors)`
`wc -l TODO` decreased. 1998-11-29 22:51:47 +08:00			`- multicast on/off (per interface)`
First look at data structures. More to come tomorrow... 1998-04-22 20:58:34 +08:00
BIRD library: The story continues. Complete resource manages and IP address handling. 1998-05-04 00:43:39 +08:00			`OSPF`
			`~~~~`
			`- importing of device routes for networks where we don't run OSPF`
Pruned the TODO list. 1999-03-02 01:51:29 +08:00			`- check incoming packets using neighbor cache`
BIRD library: The story continues. Complete resource manages and IP address handling. 1998-05-04 00:43:39 +08:00			`- stub area: either no external routes or only default route`
Pruned the TODO list. 1999-03-02 01:51:29 +08:00			`- RFC2328 appendix E: Use a better algorithm`
BIRD library: The story continues. Complete resource manages and IP address handling. 1998-05-04 00:43:39 +08:00			`- automatic generation of external route tags (RFC1403)`
Pruned the TODO list. 1999-03-02 01:51:29 +08:00			`- RFC1587 NSSA areas`
			`- RFC2370 opaque LSA's`
			`- RFC1793 Demand Circuit Support ??`
			`- respect interface MTU and try not to create larger packets unless unavoidable`
First look at data structures. More to come tomorrow... 1998-04-22 20:58:34 +08:00

			`BGP`
			`~~~`
			`- in, local, out RIB`
			`- maxsize=4096`
BIRD library: The story continues. Complete resource manages and IP address handling. 1998-05-04 00:43:39 +08:00			`- detection of loops`
First look at data structures. More to come tomorrow... 1998-04-22 20:58:34 +08:00			`- aggregation, ATOMIC_AGGREGATE`
			`- communities`
			`- confederations`
			`- attributes must be sorted!`
			`- re-export of NEXT_HOP attribute`
			`- BGP session over currently down interface`
			`- LOCAL_PREF attribute`
			`- error notification received -> log error`
			`- set TTL to 1 (configurable?)`
			`- consulting IGP for next-hop information? (what if it changes?)`
			`- 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`
			`- import of IGP routes (use external route tags from OSPF)`