TCP limits advertised TCP window to size of application window

obtained via xfer_window().

diff --git a/src/net/tcp.c b/src/net/tcp.c
index 410be73..132a3a3 100644 (file)
--- a/src/net/tcp.c
+++ b/src/net/tcp.c
@@ -363,6 +363,7 @@ static int tcp_xmit ( struct tcp_connection *tcp, int force_send ) {
        unsigned int flags;
        size_t len = 0;
        size_t seq_len;
+       size_t app_window;
        size_t window;
        int rc;
 
@@ -412,6 +413,9 @@ static int tcp_xmit ( struct tcp_connection *tcp, int force_send ) {
        window = ( ( freemem * 3 ) / 4 );
        if ( window > TCP_MAX_WINDOW_SIZE )
                window = TCP_MAX_WINDOW_SIZE;
+       app_window = xfer_window ( &tcp->xfer );
+       if ( window > app_window )
+               window = app_window;
        window &= ~0x03; /* Keep everything dword-aligned */
 
        /* Fill up the TCP header */