Explicit definition structures of route attributes

Changes in internal API:

* Every route attribute must be defined as struct ea_class somewhere.
* Registration of route attributes known at startup must be done by
  ea_register_init() from protocol build functions.
* Every attribute has now its symbol registered in a global symbol table
  defined as SYM_ATTRIBUTE
* All attribute ID's are dynamically allocated.
* Attribute value custom formatting hook is defined in the ea_class.
* Attribute names are the same for display and filters, always prefixed
  by protocol name.

Also added some unit testing code for filters with route attributes.

1 files changed, 3 insertions, 3 deletions

diff --git a/proto/ospf/topology.c b/proto/ospf/topology.c
index 9fe68264..db423dc8 100644
--- a/proto/ospf/topology.c
+++ b/proto/ospf/topology.c
@@ -1338,8 +1338,8 @@ ospf_rt_notify(struct proto *P, struct channel *ch UNUSED, net *n, rte *new, rte
 
   /* Get route attributes */
   rta *a = new->attrs;
-  eattr *m1a = ea_find(a->eattrs, EA_OSPF_METRIC1);
-  eattr *m2a = ea_find(a->eattrs, EA_OSPF_METRIC2);
+  eattr *m1a = ea_find(a->eattrs, &ea_ospf_metric1);
+  eattr *m2a = ea_find(a->eattrs, &ea_ospf_metric2);
   uint m1 = m1a ? m1a->u.data : 0;
   uint m2 = m2a ? m2a->u.data : 10000;
 
@@ -1363,7 +1363,7 @@ ospf_rt_notify(struct proto *P, struct channel *ch UNUSED, net *n, rte *new, rte
 
   uint ebit = m2a || !m1a;
   uint metric = ebit ? m2 : m1;
-  uint tag = ea_get_int(a->eattrs, EA_OSPF_TAG, 0);
+  uint tag = ea_get_int(a->eattrs, &ea_ospf_tag, 0);
 
   ip_addr fwd = IPA_NONE;
   if ((a->dest == RTD_UNICAST) && use_gw_for_fwaddr(p, a->nh.gw, a->nh.iface))