From 14959b43e01d1fdddc08f20db33fad36e3ef1f49 Mon Sep 17 00:00:00 2001
From: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
Date: Fri, 19 Jan 2018 08:33:56 +0900
Subject: [PATCH] apps/netutils/netlib: Add default route in
 netlib_set_dripv4addr()

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
---
 netutils/netlib/netlib_setdripv4addr.c | 39 ++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/netutils/netlib/netlib_setdripv4addr.c b/netutils/netlib/netlib_setdripv4addr.c
index c0ee3c00e..7a971e071 100644
--- a/netutils/netlib/netlib_setdripv4addr.c
+++ b/netutils/netlib/netlib_setdripv4addr.c
@@ -50,6 +50,10 @@
 #include <netinet/in.h>
 #include <net/if.h>
 
+#ifdef CONFIG_NET_ROUTE
+#  include <net/route.h>
+#endif
+
 #include "netutils/netlib.h"
 
 /****************************************************************************
@@ -76,6 +80,21 @@ int netlib_set_dripv4addr(FAR const char *ifname,
 {
   int ret = ERROR;
 
+#ifdef CONFIG_NET_ROUTE
+  struct sockaddr_in target;
+  struct sockaddr_in netmask;
+  struct sockaddr_in router;
+
+  memset(&target, 0, sizeof(target));
+  target.sin_family  = AF_INET;
+
+  memset(&netmask, 0, sizeof(netmask));
+  netmask.sin_family  = AF_INET;
+
+  router.sin_addr    = *addr;
+  router.sin_family  = AF_INET;
+#endif
+
   if (ifname && addr)
     {
       int sockfd = socket(PF_INET, NETLIB_SOCK_TYPE, 0);
@@ -96,6 +115,26 @@ int netlib_set_dripv4addr(FAR const char *ifname,
           memcpy(&inaddr->sin_addr, addr, sizeof(struct in_addr));
 
           ret = ioctl(sockfd, SIOCSIFDSTADDR, (unsigned long)&req);
+
+#ifdef CONFIG_NET_ROUTE
+          if (OK == ret)
+            {
+              /* Delete the default route first */
+              /* This call fails if no default route exists, but it's OK */
+
+              (void)delroute(sockfd,
+                             (FAR struct sockaddr_storage *)&target,
+                             (FAR struct sockaddr_storage *)&netmask);
+
+              /* Then add the new default route */
+
+              ret = addroute(sockfd,
+                             (FAR struct sockaddr_storage *)&target,
+                             (FAR struct sockaddr_storage *)&netmask,
+                             (FAR struct sockaddr_storage *)&router);
+            }
+#endif
+
           close(sockfd);
         }
     }