2005-10-18 Paul Jakma <paul.jakma@sun.com>

	* (general) SPF memory management cleanup and fix for rare
	  double-free bug.
	* ospf_spf.h: (struct vertex_parent) New struct to hold parent
	  specific data, eg the backlink and the parent vertex pointer,
	  and point to the appropriate general struct vertex_nexthop.
	  (struct vertex_nexthop) remove parent vertex pointer, so
	  this struct can be shared across vertices.
	  (struct vertex) rename list child to list children. Remove
	  list of nexthops, replace with list of vertex_parents.
	* ospf_spf.c: (update_stat) trivial, remove cast from void *.
	  (vertex_nexthop_new) remove init of parent - field is gone
          from struct vertex_nexthop.
          (ospf_canonical_nexthops_free) Remove the canonical
          vertex_nexthop memory objects. These are the vertex_nexthops
          attached to the first level of router vertices from the root.
          (vertex_parent_new) new function, create a vertex_parent.
          (vertex_parent_free) ditto, but free it.
          (ospf_vertex_new) Update to match changes to struct vertex.
          (ospf_vertex_free) Recursively free a struct vertex and its
          children. The parent list is used as a reference count.
          vertex_nexthops must be free seperately, if required.
          (ospf_vertex_dump) update to match struct vertex changes.
          Print out backlink of parents too.
          (ospf_vertex_add_parent) ditto.
          (ospf_lsa_has_link) update comment.
          (ospf_nexthop_add_unique) removed, not needed anymore.
          (ospf_nexthop_merge) ditto.
          (ospf_spf_consider_nexthop) renamed to ospf_spf_add_parent.
          Simplified to just create vertex_parent and add it.
          (ospf_spf_flush_parents) new function, flush out the parent
	  list.
	  (ospf_nexthop_calculation) Take the relevant route_lsa_link
	  as an argument, which simplifies things and removes the need
	  for the hack in ospf_nexthop_add_unique - ospf_spf_next
	  already knew exactly which link the cost calculated was for.
	  Update to match struct vertex changes too.
	  (ospf_spf_next) Don't create a vertex for W unnecessarily, if
          it's there's a vertex already created for W, use it, and
          hence there's no need to free it either.
          Update some manipulation/comparisons of distance to match.
          Flush the parent list if a lower cost path is found.
          (ospf_spf_route_free) unused, removed.
          (ospf_spf_dump) match the struct vertex changes, and dump the
          ifname if possible.
          (ospf_spf_calculate) At end of SPF, free the canonical nexthops
          and call ospf_vertex_free on the root vertex to free the
	  entire tree.
	* ospf_interface.c: (ospf_vl_set_params) match struct vertex
          changes.
        * ospf_route.c: (ospf_intra_route_add) ditto
          (ospf_route_copy_nexthops_from_vertex) ditto
	* memtypes.c: (memory_list_ospf) Add MTYPE_OSPF_VERTEX_PARENT.

1 files changed, 7 insertions, 4 deletions

diff --git a/ospfd/ospf_route.c b/ospfd/ospf_route.c
index 00733d84..bdbdd03e 100644
--- a/ospfd/ospf_route.c
+++ b/ospfd/ospf_route.c
@@ -278,7 +278,7 @@ ospf_intra_route_add (struct route_table *rt, struct vertex *v,
   struct ospf_route *or;
   struct prefix_ipv4 p;
   struct ospf_path *path;
-  struct vertex_nexthop *nexthop;
+  struct vertex_parent *parent;
   struct listnode *node, *nnode;
 
   p.family = AF_INET;
@@ -306,10 +306,10 @@ ospf_intra_route_add (struct route_table *rt, struct vertex *v,
     {
       or->type = OSPF_DESTINATION_NETWORK;
 
-      for (ALL_LIST_ELEMENTS (v->nexthop, node, nnode, nexthop))
+      for (ALL_LIST_ELEMENTS (v->parents, node, nnode, parent))
         {
           path = ospf_path_new ();
-          path->nexthop = nexthop->router;
+          path->nexthop = parent->nexthop->router;
           listnode_add (or->paths, path);
         }
     }
@@ -799,11 +799,14 @@ ospf_route_copy_nexthops_from_vertex (struct ospf_route *to,
   struct listnode *node;
   struct ospf_path *path;
   struct vertex_nexthop *nexthop;
+  struct vertex_parent *vp;
 
   assert (to->paths);
 
-  for (ALL_LIST_ELEMENTS_RO (v->nexthop, node, nexthop))
+  for (ALL_LIST_ELEMENTS_RO (v->parents, node, vp))
     {
+      nexthop = vp->nexthop;
+      
       if (nexthop->oi != NULL) 
 	{
 	  if (! ospf_path_exist (to->paths, nexthop->router, nexthop->oi))