TCP: Fix tcp_findlistner() in dual stack mode

Signed-off-by: Masayuki Ishikawa <masayuki.ishikawa@gmail.com>

net/tcp/tcp.h

@@ -708,7 +708,11 @@ void tcp_listen_initialize(void);
  *
  ****************************************************************************/
 
+#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
+FAR struct tcp_conn_s *tcp_findlistener(uint16_t portno, uint8_t domain);
+#else
 FAR struct tcp_conn_s *tcp_findlistener(uint16_t portno);
+#endif
 
 /****************************************************************************
  * Name: tcp_unlisten
@@ -747,7 +751,11 @@ int tcp_listen(FAR struct tcp_conn_s *conn);
  *
  ****************************************************************************/
 
+#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
+bool tcp_islistener(uint16_t portno, uint8_t domain);
+#else
 bool tcp_islistener(uint16_t portno);
+#endif
 
 /****************************************************************************
  * Name: tcp_accept_connection

net/tcp/tcp_input.c

@@ -96,6 +96,18 @@ static void tcp_input(FAR struct net_driver_s *dev, unsigned int iplen)
   int      len;
   int      i;
 
+#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
+  uint8_t  domain = PF_UNSPEC;
+  if (iplen == IPv4_HDRLEN)
+    {
+      domain = PF_INET;
+    }
+  else if (iplen == IPv6_HDRLEN)
+    {
+      domain = PF_INET6;
+    }
+#endif
+
 #ifdef CONFIG_NET_STATISTICS
   /* Bump up the count of TCP packets received */
 
@@ -165,7 +177,11 @@ static void tcp_input(FAR struct net_driver_s *dev, unsigned int iplen)
        */
 
       tmp16 = tcp->destport;
+#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
+      if (tcp_islistener(tmp16, domain))
+#else
       if (tcp_islistener(tmp16))
+#endif
         {
           /* We matched the incoming packet with a connection in LISTEN.
            * We now need to create a new connection and send a SYNACK in
@@ -327,7 +343,11 @@ found:
 
           /* Notify the listener for the connection of the reset event */
 
+#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
+          listener = tcp_findlistener(conn->lport, domain);
+#else
           listener = tcp_findlistener(conn->lport);
+#endif
 
           /* We must free this TCP connection structure; this connection
            * will never be established.

net/tcp/tcp_listen.c

@@ -77,7 +77,11 @@ static FAR struct tcp_conn_s *tcp_listenports[CONFIG_NET_MAX_LISTENPORTS];
  *
  ****************************************************************************/
 
+#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
+FAR struct tcp_conn_s *tcp_findlistener(uint16_t portno, uint8_t domain)
+#else
 FAR struct tcp_conn_s *tcp_findlistener(uint16_t portno)
+#endif
 {
   int ndx;
 
@@ -90,7 +94,11 @@ FAR struct tcp_conn_s *tcp_findlistener(uint16_t portno)
        */
 
       FAR struct tcp_conn_s *conn = tcp_listenports[ndx];
+#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
+      if (conn && conn->lport == portno && conn->domain == domain)
+#else
       if (conn && conn->lport == portno)
+#endif
         {
           /* Yes.. we found a listener on this port */
 
@@ -183,7 +191,11 @@ int tcp_listen(FAR struct tcp_conn_s *conn)
 
   /* First, check if there is already a socket listening on this port */
 
+#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
+  if (tcp_islistener(conn->lport, conn->domain))
+#else
   if (tcp_islistener(conn->lport))
+#endif
     {
       /* Yes, then we must refuse this request */
 
@@ -229,10 +241,17 @@ int tcp_listen(FAR struct tcp_conn_s *conn)
  *
  ****************************************************************************/
 
+#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
+bool tcp_islistener(uint16_t portno, uint8_t domain)
+{
+  return tcp_findlistener(portno, domain) != NULL;
+}
+#else
 bool tcp_islistener(uint16_t portno)
 {
   return tcp_findlistener(portno) != NULL;
 }
+#endif
 
 /****************************************************************************
  * Name: tcp_accept_connection
@@ -256,7 +275,11 @@ int tcp_accept_connection(FAR struct net_driver_s *dev,
    * connection.
    */
 
+#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
+  listener = tcp_findlistener(portno, conn->domain);
+#else
   listener = tcp_findlistener(portno);
+#endif
   if (listener != NULL)
     {
       /* Yes, there is a listener.  Is it accepting connections now? */

net/tcp/tcp_timer.c

@@ -235,7 +235,11 @@ void tcp_timer(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
 
                   /* Find the listener for this connection. */
 
+#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
+                  listener = tcp_findlistener(conn->lport, conn->domain);
+#else
                   listener = tcp_findlistener(conn->lport);
+#endif
                   if (listener != NULL)
                     {
                       /* We call tcp_callback() for the connection with