external/connectivity: Use active gatewayAddress for default route

Cne should use the active gatewayAddress for default route if
the gatewayAddress saved by iproute2 is not available.
And Cne should not delete the default entry when Cne detects no
routing table exists.

Change-Id: I3027b277c72eec415eea67af1b1bc3d60350fc14
CRs-fixed: 262357

3 files changed, 23 insertions, 9 deletions

diff --git a/cnd/inc/cnd_iproute2.h b/cnd/inc/cnd_iproute2.h
index 0c41875..24b8080 100644
--- a/cnd/inc/cnd_iproute2.h
+++ b/cnd/inc/cnd_iproute2.h
@@ -214,7 +214,8 @@ class cnd_iproute2
     */
     bool replaceDefaultEntryInMainTable
     (
-      uint8_t *deviceName
+      uint8_t *deviceName,
+      uint8_t *gatewayAddress
     );
 
     /**
diff --git a/cnd/src/cnd_iproute2.cpp b/cnd/src/cnd_iproute2.cpp
index 8329647..311f682 100644
--- a/cnd/src/cnd_iproute2.cpp
+++ b/cnd/src/cnd_iproute2.cpp
@@ -187,6 +187,7 @@ bool modifyCustomRouteInMainTable
 bool modifyDefaultRoute
 (
   uint8_t *deviceName,
+  uint8_t *gatewayAddress,
   Cmd_line_actions commandAction
 );
 
@@ -787,11 +788,15 @@ bool modifyCustomRouteInMainTable
 bool modifyDefaultRoute
 (
   uint8_t *deviceName,
+  uint8_t *cmdGatewayAddress,
   Cmd_line_actions commandAction
 )
 {
   uint8_t *gatewayAddress = NULL;
 
+  CNE_LOGV("modifyDefaultRoute: devName:%s, cmdGateway:%s, action:%d", 
+           deviceName, cmdGatewayAddress, commandAction);
+
   switch(commandAction)
   {
     case ACTIONS_REPLACE_ENUM:
@@ -905,6 +910,9 @@ bool modifyDefaultRoute
   // These commands may fail if the kernel has already executed an operation on
   // its own. Treat a call to modify the main table as if was successful.
   if (NULL == gatewayAddress)
+    gatewayAddress = cmdGatewayAddress;
+
+  if (NULL == gatewayAddress)
   {
     cmdLineCaller(ROUTING_CMD,
                   cmdLineActionEnumToString(commandAction),
@@ -979,7 +987,6 @@ bool modifyRoutingTable
     CNE_LOGD("A null device name was passed while modifying a routing table");
     return false;
   }
-
   switch(commandAction)
   {
     case ACTIONS_ADD_ENUM:
@@ -1209,7 +1216,7 @@ bool modifyRoutingTable
       if (NULL == defaultDevice)
       {
         CNE_LOGV("Routing table added when no default exists. Adding new default.");
-        modifyDefaultRoute(deviceName, ACTIONS_REPLACE_ENUM);
+        modifyDefaultRoute(deviceName, gatewayAddress, ACTIONS_REPLACE_ENUM);
       }
 
       break;
@@ -1221,10 +1228,13 @@ bool modifyRoutingTable
       tableNumberSet.erase(tableNumber);
 
       // If there are no more tables, then there should be no default device.
+      // There is a scenarios where iproute2 is recorded having no table since
+      // iproute2 not adding it, but there is default entry in main table 
+      // created by system when network comes up, and if the default entry is
+      // removed, then there will be no default. Need to revisit iproute2.
       if (0 == tableNumberSet.size())
       {
-        CNE_LOGV("Removing default table after no devices are known to be up");
-        modifyDefaultRoute(NULL, ACTIONS_DELETE_ENUM);
+        CNE_LOGW("Warning: There are no tables");
       }
 
       // If the default table has been deleted and another device is available,
@@ -1235,7 +1245,7 @@ bool modifyRoutingTable
         uint8_t *newDefaultName = routingTableMap.begin()->first;
 
         CNE_LOGV("Replacing old default device with %s", newDefaultName);
-        modifyDefaultRoute(newDefaultName, ACTIONS_REPLACE_ENUM);
+        modifyDefaultRoute(newDefaultName, gatewayAddress, ACTIONS_REPLACE_ENUM);
       }
 
       break;
@@ -1706,10 +1716,13 @@ bool cnd_iproute2::deleteDefaultEntryInMainTable
  *--------------------------------------------------------------------------*/
 bool cnd_iproute2::replaceDefaultEntryInMainTable
 (
-  uint8_t *deviceName
+  uint8_t *deviceName,
+  uint8_t *gatewayAddress
 )
 {
-  return (modifyDefaultRoute(deviceName, ACTIONS_REPLACE_ENUM));
+  CNE_LOGV("replaceDefaultEntryInMainTable: devName:%s, gatewayAddress:%s", 
+            deviceName, gatewayAddress);
+  return (modifyDefaultRoute(deviceName, gatewayAddress, ACTIONS_REPLACE_ENUM));
 }
 
 /*----------------------------------------------------------------------------
diff --git a/cnd/src/cnd_process.cpp b/cnd/src/cnd_process.cpp
index 224d2fb..731d1d0 100644
--- a/cnd/src/cnd_process.cpp
+++ b/cnd/src/cnd_process.cpp
@@ -236,7 +236,7 @@ processCommand (int command, void *data, size_t datalen, CND_Token t)
         break;
       case CNE_IPROUTE2_REPLACE_DEFAULT_ENTRY_IN_MAIN:
       case CNE_IPROUTE2_REPLACE_HOST_DEFAULT_ENTRY_IN_MAIN:
-        cnd_iproute2::getInstance()->replaceDefaultEntryInMainTable(ifName);
+        cnd_iproute2::getInstance()->replaceDefaultEntryInMainTable(ifName, gatewayAddr);
         break;
       case CNE_IPROUTE2_ADD_HOST_IN_MAIN:
         cnd_iproute2::getInstance()->addCustomEntryInMainTable(ipAddr, ifName, gatewayAddr);