[bgpd] Peer delete can race with reconfig leading to crash

2007-02-22 Paul Jakma <paul.jakma@sun.com>

	* bgp_fsm.c: (bgp_fsm_change_status) Handle state change into
	  clearing or greater here. Simpler.
	  (bgp_event) Clearing state change work moved to previous
	* bgp_route.c: (bgp_clear_route_node) Clearing adj-in here
	  is too late, as it leaves a race between a peer being deleted
	  and an identical peer being configured before clearing
	  completes, leading to a crash.
	  Simplest fix is to clean peers Adj-in up-front, rather than
	  queueing such work.
	  (bgp_clear_route_table) Clear peer's Adj-In and Adj-Out
	  up-front here, rather than queueing such work.
	  Extensive comment added on the various bits of indexed data
	  that exist and how they need to be dealt with.
	  (bgp_clear_route) Update comment.

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