BGP: implement Adj-RIB-In

The patch implements optional internal import table to a channel and
hooks it to BGP so it can be used as Adj-RIB-In. When enabled, all
received (pre-filtered) routes are stored there and import filters can
be re-evaluated without explicit route refresh. An import table can be
examined using e.g. 'show route import table bgp1.ipv4'.

1 files changed, 10 insertions, 0 deletions

diff --git a/nest/config.Y b/nest/config.Y
index 34bde3fa..aef5ed46 100644
--- a/nest/config.Y
+++ b/nest/config.Y
@@ -558,6 +558,16 @@ r_args:
        rt_show_add_table($$, t->table);
      $$->tables_defined_by = RSD_TDB_ALL;
    }
+ | r_args IMPORT TABLE SYM '.' r_args_channel {
+     $$ = $1;
+     struct proto_config *cf = (void *) $4->def;
+     if ($4->class != SYM_PROTO || !cf->proto) cf_error("%s is not a protocol", $4->name);
+     struct channel *c = proto_find_channel_by_name(cf->proto, $6);
+     if (!c) cf_error("Channel %s.%s not found", $4->name, $6);
+     if (!c->in_table) cf_error("No import table in channel %s.%s", $4->name, $6);
+     rt_show_add_table($$, c->in_table);
+     $$->tables_defined_by = RSD_TDB_DIRECT;
+   }
  | r_args FILTER filter {
      $$ = $1;
      if ($$->filter != FILTER_ACCEPT) cf_error("Filter specified twice");