bird: function -> filter

roles/bird/templates/bird.conf.j2

@@ -116,7 +116,7 @@ protocol ospf v3 ospf6 {
 }
 {% endif %}
 
-{%  macro bird_filter_function(filter, last) %}
+{%  macro bird_filter(filter, last) %}
 {% if filter.as_prepend is defined %}
 {% for _ in range(filter.as_prepend.size) %}
 bgp_path.prepend({{ filter.as_prepend.asn }});
@@ -133,7 +133,7 @@ return {{ filter.accept | ternary("true", "false") }};
 {% for session in bird__bgp_sessions %}
 {% for version in [4, 6] %}
 {% for direction in ["import", "export"] %}
-function bgp{{ version }}_{{ direction }}_{{ session.name }}() {
+filter bgp{{ version }}_{{ direction }}_{{ session.name }} {
 {% for filter in session[direction] %}
 {% if filter.prefix | default([]) %}
 {% set op =
@@ -149,11 +149,11 @@ function bgp{{ version }}_{{ direction }}_{{ session.name }}() {
                        | ternary("+", "")) %}
 {% if networks %}
     if net {{ op }} [ {{ networks | join(", ") }} ] then {
-        {{ bird_filter_function(filter) | indent(8) }}
+        {{ bird_filter(filter) | indent(8) }}
     }
 {% endif %}
 {% else %}
-    {{ bird_filter_function(filter) | indent(4) }}
+    {{ bird_filter(filter) | indent(4) }}
 {% endif %}
 {% endfor %}
 }
@@ -177,8 +177,8 @@ protocol bgp bgp{{ version }}_{{ session.name }} {
     neighbor {{ remote_address }} as {{ session.remote.as }};
 
     {{ "ipv4" if version == 4 else "ipv6" }} {
-        import where bgp{{ version }}_import_{{ session.name }}();
-        export where bgp{{ version }}_export_{{ session.name }}();
+        import filter bgp{{ version }}_import_{{ session.name }};
+        export filter bgp{{ version }}_export_{{ session.name }};
     };
 
 }