netlib: replace DNS ping with gateway ping for connectivity check

Refactor netlib_check_ipconnectivity() to use gateway/router ping instead
of DNS server ping for network connectivity checks. Add IPv6 support.

Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>

Author: zhhyu7

include/netutils/netlib.h

@@ -561,12 +561,49 @@ int netlib_getifstatistics(FAR const char *ifname,
 int netlib_check_ifconflict(FAR const char *ifname);
 #endif
 
-#ifdef CONFIG_NETUTILS_PING
+/****************************************************************************
+ * Name: netlib_check_ipconnectivity
+ *
+ * Description:
+ *   Check network connectivity by pinging a remote IP address.
+ *   If ip is NULL, ping the gateway of each network interface,
+ *   and optionally the routers from the routing table. If ping
+ *   is disabled, just check the status of the IP network card.
+ *
+ * Parameters:
+ *   ip       The ipv4 address to check, or NULL to ping gateways
+ *   timeout  The max timeout of each ping
+ *   retry    The retry times of ping
+ *
+ * Return:
+ *   nums of remote reply of ping; a negative or ZERO on failure
+ *
+ ****************************************************************************/
+
 int netlib_check_ipconnectivity(FAR const char *ip, int timeout, int retry);
+
+#ifdef CONFIG_NETUTILS_PING
+
+/****************************************************************************
+ * Name: netlib_check_ifconnectivity
+ *
+ * Description:
+ *   Check network connectivity by pinging the default gateway
+ *   of the specified network interface.
+ *
+ * Parameters:
+ *   ifname   The name of the interface to use
+ *   timeout  The timeout of ping
+ *   retry    The retry times of ping
+ *
+ * Return:
+ *   nums of gateway reply of ping; a negative on failure.
+ *
+ ****************************************************************************/
+
 int netlib_check_ifconnectivity(FAR const char *ifname,
                                 int timeout, int retry);
 #else
-#define netlib_check_ipconnectivity(i, t, r) 1
 #define netlib_check_ifconnectivity(i, t, r) 1
 #endif
 

netutils/netlib/CMakeLists.txt

@@ -158,8 +158,10 @@ if(CONFIG_NETUTILS_NETLIB)
     list(APPEND SRCS netlib_getiobinfo.c)
   endif()
 
+  list(APPEND SRCS netlib_checkipconnectivity.c)
+
   if(CONFIG_NETUTILS_PING)
-    list(APPEND SRCS netlib_checkipconnectivity.c netlib_checkifconnectivity.c)
+    list(APPEND SRCS netlib_checkifconnectivity.c)
   endif()
 
   list(APPEND SRCS netlib_checkhttpconnectivity.c)

netutils/netlib/Makefile

@@ -157,8 +157,10 @@ ifeq ($(CONFIG_MM_IOB),y)
 CSRCS += netlib_getiobinfo.c
 endif
 
+CSRCS += netlib_checkipconnectivity.c
+
 ifeq ($(CONFIG_NETUTILS_PING),y)
-CSRCS += netlib_checkipconnectivity.c netlib_checkifconnectivity.c
+CSRCS += netlib_checkifconnectivity.c
 endif
 
 CSRCS += netlib_checkhttpconnectivity.c

netutils/netlib/netlib_checkifconnectivity.c

@@ -48,15 +48,16 @@
  * Name: netlib_check_ifconnectivity
  *
  * Description:
- *   Check network interface connectivity by pinging the gateway
+ *   Check network connectivity by pinging the default gateway
+ *   of the specified network interface.
  *
  * Parameters:
  *   ifname   The name of the interface to use
  *   timeout  The timeout of ping
  *   retry    The retry times of ping
  *
  * Return:
- *   nums of gateway reply of ping; a nagtive on failure.
+ *   nums of gateway reply of ping; a negative on failure.
  *
  ****************************************************************************/
 
@@ -86,4 +87,4 @@ int netlib_check_ifconnectivity(FAR const char *ifname,
   return netlib_check_ipconnectivity(destip, timeout, retry);
 }
 
-#endif /* CONFIG_NETUTILS_PING */
+#endif /* CONFIG_NETUTILS_PING */