Move some internal networking function protoypes out of the public...

Move some internal networking function protoypes out of the public include/nuttx/net/arp.h into to the private net/arp/arp.h

include/nuttx/net/arp.h

@@ -186,47 +186,6 @@ void arp_arpin(struct net_driver_s *dev);
 
 void arp_out(FAR struct net_driver_s *dev);
 
-/****************************************************************************
- * Name: arp_find
- *
- * Description:
- *   Find the ARP entry corresponding to this IP address.
- *
- * Input parameters:
- *   ipaddr - Refers to an IP address in network order
- *
- * Assumptions
- *   Interrupts are disabled; Returned value will become unstable when
- *   interrupts are re-enabled or if any other uIP APIs are called.
- *
- ****************************************************************************/
-
-FAR struct arp_entry *arp_find(in_addr_t ipaddr);
-
-/****************************************************************************
- * Name: arp_delete
- *
- * Description:
- *   Remove an IP association from the ARP table
- *
- * Input parameters:
- *   ipaddr - Refers to an IP address in network order
- *
- * Assumptions
- *   Interrupts are disabled to assure exclusive access to the ARP table
- *   (and because arp_find() is called).
- *
- ****************************************************************************/
-
-#define arp_delete(ipaddr) \
-{ \
-  struct arp_entry *tabptr = arp_find(ipaddr); \
-  if (tabptr) \
-    { \
-      tabptr->at_ipaddr = 0; \
-    } \
-}
-
 /****************************************************************************
  * Name: arp_update
  *
@@ -234,6 +193,13 @@ FAR struct arp_entry *arp_find(in_addr_t ipaddr);
  *   Add the IP/HW address mapping to the ARP table -OR- change the IP
  *   address of an existing association.
  *
+ *   NOTE: This is an internal interface withint the networking layer and
+ *   should not be used by application software.  This prototype is here
+ *   because there is already a violation of this structureing:  The
+ *   apps/netutils/dhcpd logic currently calls arp_update() directly.  That
+ *   is bad and needs to be replace with some ioctl interface perhaps hidden
+ *   somewhere in apps/netutils/netlib.
+ *
  * Input parameters:
  *   pipaddr - Refers to an IP address uint16_t[2] in network order
  *   ethaddr - Refers to a HW address uint8_t[IFHWADDRLEN]

net/arp/arp.h

@@ -281,6 +281,65 @@ int arp_send(in_addr_t ipaddr);
 int arp_poll(FAR struct net_driver_s *dev, devif_poll_callback_t callback);
 #endif
 
+/****************************************************************************
+ * Name: arp_find
+ *
+ * Description:
+ *   Find the ARP entry corresponding to this IP address.
+ *
+ * Input parameters:
+ *   ipaddr - Refers to an IP address in network order
+ *
+ * Assumptions
+ *   Interrupts are disabled; Returned value will become unstable when
+ *   interrupts are re-enabled or if any other uIP APIs are called.
+ *
+ ****************************************************************************/
+
+FAR struct arp_entry *arp_find(in_addr_t ipaddr);
+
+/****************************************************************************
+ * Name: arp_delete
+ *
+ * Description:
+ *   Remove an IP association from the ARP table
+ *
+ * Input parameters:
+ *   ipaddr - Refers to an IP address in network order
+ *
+ * Assumptions
+ *   Interrupts are disabled to assure exclusive access to the ARP table
+ *   (and because arp_find() is called).
+ *
+ ****************************************************************************/
+
+#define arp_delete(ipaddr) \
+{ \
+  struct arp_entry *tabptr = arp_find(ipaddr); \
+  if (tabptr) \
+    { \
+      tabptr->at_ipaddr = 0; \
+    } \
+}
+
+/****************************************************************************
+ * Name: arp_update
+ *
+ * Description:
+ *   Add the IP/HW address mapping to the ARP table -OR- change the IP
+ *   address of an existing association.
+ *
+ * Input parameters:
+ *   pipaddr - Refers to an IP address uint16_t[2] in network order
+ *   ethaddr - Refers to a HW address uint8_t[IFHWADDRLEN]
+ *
+ * Assumptions
+ *   Interrupts are disabled to assure exclusive access to the ARP table.
+ *
+ ****************************************************************************/
+
+void arp_update(FAR uint16_t *pipaddr, FAR uint8_t *ethaddr);
+
 /****************************************************************************
  * Name: arp_dump
  *