+/**
+ * Initialize connection by gleaning network and rcv params from buffer
+ *
+ * @param tc connection to initialize
+ * @param b buffer whose current data is pointing at ip
+ * @param is_ip4 flag set to 1 if using ip4
+ */
+void tcp_init_w_buffer (tcp_connection_t * tc, vlib_buffer_t * b, u8 is_ip4);