websocket: accepts config value with units

Ticket: 8552

As was the commented out example

rust/src/websocket/websocket.rs

@@ -17,7 +17,7 @@
 
 use super::parser;
 use crate::applayer::{self, *};
-use crate::conf::conf_get;
+use crate::conf::{conf_get, get_memval};
 use crate::core::{
     sc_app_layer_parser_trigger_raw_stream_inspection, ALPROTO_FAILED, ALPROTO_UNKNOWN, IPPROTO_TCP,
 };
@@ -437,8 +437,15 @@ pub unsafe extern "C" fn SCRegisterWebSocketParser() {
         }
         SCLogDebug!("Rust websocket parser registered.");
         if let Some(val) = conf_get("app-layer.protocols.websocket.max-payload-size") {
-            if let Ok(v) = val.parse::<u32>() {
+            if let Ok(v) = get_memval(val) {
-                WEBSOCKET_MAX_PAYLOAD_SIZE = v;
+                if let Ok(vu) = u32::try_from(v) {
+                    WEBSOCKET_MAX_PAYLOAD_SIZE = vu;
+                } else {
+                    SCLogError!(
+                        "Too big value for websocket.max-payload-size: max is {}.",
+                        u32::MAX
+                    );
+                }
             } else {
                 SCLogError!("Invalid value for websocket.max-payload-size");
             }