net/tcp: fix invaild application preload

Change-Id: Ifebe4c2715ccfc0e11d8b45792d51912f110d92e
Signed-off-by: chao.an <anchao@xiaomi.com>

net/tcp/tcp_callback.c

@@ -319,8 +319,10 @@ uint16_t tcp_datahandler(FAR struct tcp_conn_s *conn, FAR uint8_t *buffer,
   /* Provide notification(s) that additional TCP read-ahead data is
    * available.
    */
-
-  tcp_readahead_signal(conn);
+  if (queue == &conn->readahead)
+    {
+      tcp_readahead_signal(conn);
+    }
 #endif
 
   ninfo("Buffered %d bytes\n", buflen);

net/tcp/tcp_input.c

@@ -1150,6 +1150,15 @@ static void tcp_process_cache(FAR struct net_driver_s *dev, uint8_t domain,
 
           dev->d_len = iob->io_pktlen - NET_LL_HDRLEN(dev);
 
+          if (IFF_IS_IPv4(dev->d_flags))
+            {
+              tcp_ipv4_select(dev);
+            }
+          else
+            {
+              tcp_ipv6_select(dev);
+            }
+
           tcp_input(dev, domain, iplen, NULL);
 
           iob_free_queue(iob, &conn->pendingahead,