procfs: Add support for routing tables.

net/procfs/procfs.h

@@ -50,6 +50,10 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
+#ifdef CONFIG_FS_PROCFS_EXCLUDE_ROUTE
+#  undef CONFIG_NET_ROUTE
+#endif
+
 /* Determines the size of an intermediate buffer that must be large enough
  * to handle the longest line generated by this logic.
  */
@@ -60,6 +64,19 @@
  * Public Type Definitions
  ****************************************************************************/
 
+/* Describes the /net directory entries */
+
+enum netprocfs_entry_e
+{
+  NETPROCFS_SUBDIR_DEV = 0           /* Multiple instances, e.g. /proc/net/eth0 */
+#ifdef CONFIG_NET_STATISTICS
+  , NETPROCFS_SUBDIR_STAT            /* /proc/net/stat */
+#endif
+#ifdef CONFIG_NET_ROUTE
+  , NETPROCFS_SUBDIR_ROUTE           /* /proc/net/route */
+#endif
+};
+
 /* This structure describes one open "file" */
 
 struct net_driver_s;                 /* Forward reference */
@@ -70,6 +87,7 @@ struct netprocfs_file_s
   uint8_t lineno;                    /* Line number */
   uint8_t linesize;                  /* Number of valid characters in line[] */
   uint8_t offset;                    /* Offset to first valid character in line[] */
+  uint8_t entry;                     /* See enum netprocfs_entry_e */
   char line[NET_LINELEN];            /* Pre-allocated buffer for formatted lines */
 };
 
@@ -148,6 +166,29 @@ ssize_t netprocfs_read_netstats(FAR struct netprocfs_file_s *priv,
                                 FAR char *buffer, size_t buflen);
 #endif
 
+/****************************************************************************
+ * Name: netprocfs_read_routes
+ *
+ * Description:
+ *   Read and format routing table entries.
+ *
+ * Input Parameters:
+ *   priv - A reference to the network procfs file structure
+ *   buffer - The user-provided buffer into which network status will be
+ *            returned.
+ *   bulen  - The size in bytes of the user provided buffer.
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; a negated errno value is returned
+ *   on failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_NET_ROUTE
+ssize_t netprocfs_read_routes(FAR struct netprocfs_file_s *priv,
+                              FAR char *buffer, size_t buflen);
+#endif
+
 /****************************************************************************
  * Name: netprocfs_read_devstats
  *