isisd: fix crash on "no router isis" (BZ#536)
The crash is due to threads accessing data that gets destroyed
during the removal of the configuration.
* isis_circuit.c: Destroy adjacencies to stop adjacency expiry thread.
Stop PSNP threads.
* isisd.c: Change state of circuit back to INIT and reassign the
circuit structure to isis->init_circ_list rather than destroying
the circuit data structure. Stop SPF threads. Stop LSP generation
threads.
* isisd.h: Add pointers to LSP threads into area structure in order to
stop them in isisd.c
* isis_lsp.c: Store pointer to LSP thread in area structure.
* isis_pdu.c: Stop PDU generation for a circuit with a removed area.
* isis_pfpacket.c: Stop processing received PDUs for a circuit with a
removed area.
diff --git a/isisd/isisd.h b/isisd/isisd.h
index 2277f27..b17982e 100644
--- a/isisd/isisd.h
+++ b/isisd/isisd.h
@@ -93,6 +93,8 @@
struct flags flags;
struct thread *t_tick; /* LSP walker */
struct thread *t_remove_aged;
+ struct thread *t_lsp_l1_regenerate;
+ struct thread *t_lsp_l2_regenerate;
int lsp_regenerate_pending[ISIS_LEVELS];
struct thread *t_lsp_refresh[ISIS_LEVELS];