Add measurement log reset callback function

include/internal/libspdm_common_lib.h

@@ -687,6 +687,10 @@ typedef struct {
 #if (LIBSPDM_ENABLE_CAPABILITY_ENCAP_CAP) && (LIBSPDM_SEND_GET_ENDPOINT_INFO_SUPPORT)
     libspdm_get_endpoint_info_callback_func get_endpoint_info_callback;
 #endif /* (LIBSPDM_ENABLE_CAPABILITY_ENCAP_CAP) && (LIBSPDM_SEND_GET_ENDPOINT_INFO_SUPPORT) */
+
+#if LIBSPDM_ENABLE_CAPABILITY_MEAS_CAP
+    libspdm_meas_log_reset_callback_func spdm_meas_log_reset_callback;
+#endif /* LIBSPDM_ENABLE_CAPABILITY_MEAS_CAP */
 } libspdm_context_t;
 
 #define LIBSPDM_CONTEXT_SIZE_WITHOUT_SECURED_CONTEXT (sizeof(libspdm_context_t))

include/library/spdm_common_lib.h

@@ -1036,6 +1036,21 @@ typedef libspdm_return_t (*libspdm_get_endpoint_info_callback_func)(
     const void *endpoint_info);
 #endif /* LIBSPDM_ENABLE_CAPABILITY_ENCAP_CAP && LIBSPDM_SEND_GET_ENDPOINT_INFO_SUPPORT */
 
+#if LIBSPDM_ENABLE_CAPABILITY_MEAS_CAP
+/**
+ * A Callback function to notify integrator measurement log is reset.
+ * This is used to support the "Content changed" field in the MEASUREMENTS response.
+ *
+ * @param spdm_context       A pointer to the SPDM context.
+ * @param session_id         A pointer to the session ID.
+ *                           If non-NULL then message is within a secure session.
+ *                           If NULL then message is outside a secure session.
+ **/
+typedef void (*libspdm_meas_log_reset_callback_func)(
+    void *spdm_context,
+    const uint32_t *session_id);
+#endif /* LIBSPDM_ENABLE_CAPABILITY_MEAS_CAP */
+
 #ifdef __cplusplus
 }
 #endif

include/library/spdm_responder_lib.h

@@ -315,6 +315,21 @@ libspdm_return_t libspdm_register_get_endpoint_info_callback_func(
     void *spdm_context, libspdm_get_endpoint_info_callback_func get_endpoint_info_callback);
 #endif /* LIBSPDM_ENABLE_CAPABILITY_ENCAP_CAP && LIBSPDM_SEND_GET_ENDPOINT_INFO_SUPPORT */
 
+#if LIBSPDM_ENABLE_CAPABILITY_MEAS_CAP
+/**
+ * This function registers the callback function for notify
+ * integrator L1L2 is reset.
+ *
+ * @param  spdm_context                 A pointer to the SPDM context.
+ * @param  spdm_meas_log_reset_callback     L1L2 reset callback function
+ *
+ * @retval LIBSPDM_STATUS_SUCCESS Success
+ * @retval LIBSPDM_STATUS_INVALID_PARAMETER Some parameters invalid or NULL
+ */
+libspdm_return_t libspdm_register_meas_log_reset_callback(
+    void *spdm_context, libspdm_meas_log_reset_callback_func spdm_meas_log_reset_callback);
+#endif /* LIBSPDM_ENABLE_CAPABILITY_MEAS_CAP */
+
 /**
  * This function allows the consumer to terminate a session.
  * For example, it can be used when watchdog fires.

library/spdm_common_lib/libspdm_com_context_data.c

@@ -1384,6 +1384,12 @@ void libspdm_reset_message_m(libspdm_context_t *spdm_context, void *session_info
         }
     }
 #endif
+#if LIBSPDM_ENABLE_CAPABILITY_MEAS_CAP
+    if (spdm_context->spdm_meas_log_reset_callback != NULL) {
+        spdm_context->spdm_meas_log_reset_callback(
+            spdm_context, spdm_session_info == NULL ? NULL : &spdm_session_info->session_id);
+    }
+#endif /* LIBSPDM_ENABLE_CAPABILITY_MEAS_CAP */
 }
 
 /**

library/spdm_responder_lib/libspdm_rsp_measurements.c

@@ -7,6 +7,15 @@
 #include "internal/libspdm_responder_lib.h"
 
 #if LIBSPDM_ENABLE_CAPABILITY_MEAS_CAP
+
+libspdm_return_t libspdm_register_meas_log_reset_callback(
+    void *spdm_context, libspdm_meas_log_reset_callback_func spdm_meas_log_reset_callback)
+{
+    libspdm_context_t *context = (libspdm_context_t *)spdm_context;
+    context->spdm_meas_log_reset_callback = spdm_meas_log_reset_callback;
+    return LIBSPDM_STATUS_SUCCESS;
+}
+
 bool libspdm_generate_measurement_signature(libspdm_context_t *spdm_context,
                                             libspdm_session_info_t *session_info,
                                             uint8_t slot_id,

unit_test/test_spdm_responder/measurements.c

@@ -10,6 +10,27 @@
 
 #if LIBSPDM_ENABLE_CAPABILITY_MEAS_CAP
 
+void spdm_meas_log_reset_callback (
+    void *spdm_context,
+    const uint32_t *session_id)
+{
+    libspdm_context_t *context = spdm_context;
+    if (session_id == NULL) {
+#if LIBSPDM_RECORD_TRANSCRIPT_DATA_SUPPORT
+        assert_int_equal(context->transcript.message_m.buffer_size, 0);
+#else
+        assert_null(context->transcript.digest_context_l1l2);
+#endif
+    } else {
+        libspdm_session_info_t* session_info = &context->session_info[0];
+#if LIBSPDM_RECORD_TRANSCRIPT_DATA_SUPPORT
+        assert_int_equal(session_info->session_transcript.message_m.buffer_size, 0);
+#else
+        assert_null(session_info->session_transcript.digest_context_l1l2);
+#endif
+    }
+}
+
 spdm_get_measurements_request_t m_libspdm_get_measurements_request1 = {
     { SPDM_MESSAGE_VERSION_10, SPDM_GET_MEASUREMENTS, 0,
       SPDM_GET_MEASUREMENTS_REQUEST_MEASUREMENT_OPERATION_TOTAL_NUMBER_OF_MEASUREMENTS },
@@ -147,6 +168,7 @@ static void rsp_measurements_case1(void **state)
         m_libspdm_use_measurement_spec;
     spdm_context->connection_info.algorithm.measurement_hash_algo =
         m_libspdm_use_measurement_hash_algo;
+    spdm_context->spdm_meas_log_reset_callback = spdm_meas_log_reset_callback;
     libspdm_reset_message_m(spdm_context, NULL);
 
     libspdm_secret_lib_meas_opaque_data_size = 0;