[chassis][routecheck]filter out the chassis internal interfaces (#1798)

Author: mlok-nokia

scripts/route_check.py

@@ -47,6 +47,7 @@
 import traceback
 
 from swsscommon import swsscommon
+from utilities_common import chassis
 
 APPL_DB_NAME = 'APPL_DB'
 ASIC_DB_NAME = 'ASIC_DB'
@@ -348,6 +349,9 @@ def filter_out_local_interfaces(keys):
     local_if_lst = {'eth0', 'docker0'}
     local_if_lo = [r'tun0', r'lo', r'Loopback\d+']
 
+    chassis_local_intfs = chassis.get_chassis_local_interfaces()
+    local_if_lst.update(set(chassis_local_intfs))
+    
     db = swsscommon.DBConnector(APPL_DB_NAME, 0)
     tbl = swsscommon.Table(db, 'ROUTE_TABLE')
 

utilities_common/chassis.py

@@ -0,0 +1,18 @@
+import os
+from sonic_py_common import device_info
+
+def get_chassis_local_interfaces():
+    lst = []
+    platform = device_info.get_platform()
+    chassisdb_conf=os.path.join('/usr/share/sonic/device/', platform, "chassisdb.conf")
+    if os.path.exists(chassisdb_conf):
+        lines=[]
+        with open(chassisdb_conf, 'r') as f:
+            lines = f.readlines()
+        for line in lines:
+            line = line.strip()
+            if "chassis_internal_intfs" in line:
+                data = line.split("=")
+                lst = data[1].split(",")
+                return lst
+    return lst