pbr: T6430: Allow forwarding into VRFs by name as well as route table IDs

* PBR can only target table IDs up to 200 and the previous PR to extend the
  range was rejected
* PBR with this PR can now also target VRFs directly by name, working around
  targeting problems for VRF table IDs outside the overlapping 100-200 range
* Validation ensures rules can't target both a table ID and a VRF name
  (internally they are handled the same)
* Added a simple accessor (get_vrf_table_id) for runtime mapping a VRF name
  to table ID, based on vyos.ifconfig.interface._set_vrf_ct_zone().
  It does not replace that usage, as it deliberately does not handle non-VRF
  interface lookups (would fail with a KeyError).
* Added route table ID lookup dict, global route table and VRF table defs
  to vyos.defaults. Table ID references have been updated in code touched
  by this PR.
* Added a simple smoketest to validate 'set vrf' usage in PBR rules

1 files changed, 3 insertions, 0 deletions

diff --git a/python/vyos/utils/network.py b/python/vyos/utils/network.py
index 8fce08de0..d297a1ddb 100644
--- a/python/vyos/utils/network.py
+++ b/python/vyos/utils/network.py
@@ -74,6 +74,9 @@ def get_vrf_members(vrf: str) -> list:
         pass
     return interfaces
 
+def get_vrf_table_id(vrf: str):
+    return get_interface_config(vrf)['linkinfo']['info_data']['table']
+
 def get_interface_vrf(interface):
     """ Returns VRF of given interface """
     from vyos.utils.dict import dict_search