USIM validation on authentication procedure

src/ue/mm/auth.cpp

@@ -17,6 +17,9 @@ namespace nr::ue
 
 void NasMm::receiveAuthenticationRequest(const nas::AuthenticationRequest &msg)
 {
+    if (!m_validSim)
+        m_logger->warn("Authentication request is ignored. USIM is invalid");
+
     if (msg.eapMessage.has_value())
         receiveAuthenticationRequestEap(msg);
     else
@@ -428,5 +431,4 @@ crypto::milenage::Milenage NasMm::calculateMilenage(const OctetString &sqn, cons
     return crypto::milenage::Calculate(opc, m_base->config->key, rand, sqn, m_base->config->amf);
 }
 
-
-}
\ No newline at end of file
+} // namespace nr::ue
\ No newline at end of file