VPP-69: Create fib or bridge domain with arbitrary ID

It appeared to me that it might be usefull
to allow users to create fibs or bridge domains without
a complete knowledge of the current used IDs.

These changes define fib and bridge domain constructors
when the provided ID is ~0. In such a case, an unused ID is
used to create a new fib or bridge domain.

Change-Id: Iaba69a023296e6d17bdde45980f9db84832a3995
Signed-off-by: Pierre Pfister <ppfister@cisco.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/vnet/vnet/ip/ip4_forward.c b/vnet/vnet/ip/ip4_forward.c
index a50664cc662..a84b83bc225 100644
--- a/vnet/vnet/ip/ip4_forward.c
+++ b/vnet/vnet/ip/ip4_forward.c
@@ -103,6 +103,14 @@ find_ip4_fib_by_table_index_or_id (ip4_main_t * im,
   fib_index = table_index_or_id;
   if (! (flags & IP4_ROUTE_FLAG_FIB_INDEX))
     {
+      if (table_index_or_id == ~0) {
+        table_index_or_id = 0;
+        while ((p = hash_get (im->fib_index_by_table_id, table_index_or_id))) {
+          table_index_or_id++;
+        }
+        return create_fib_with_table_id (im, table_index_or_id);
+      }
+
       p = hash_get (im->fib_index_by_table_id, table_index_or_id);
       if (! p)
 	return create_fib_with_table_id (im, table_index_or_id);