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      1 /*
      2  * Copyright 2022-2023 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the Apache License 2.0 (the "License").  You may not use
      5  * this file except in compliance with the License.  You can obtain a copy
      6  * in the file LICENSE in the source distribution or at
      7  * https://www.openssl.org/source/license.html
      8  */
      9 
     10 #ifndef OSSL_QUIC_STATS_H
     11 #define OSSL_QUIC_STATS_H
     12 
     13 #include <openssl/ssl.h>
     14 #include "internal/time.h"
     15 #include "internal/quic_predef.h"
     16 
     17 #ifndef OPENSSL_NO_QUIC
     18 
     19 struct ossl_statm_st {
     20     OSSL_TIME smoothed_rtt, latest_rtt, min_rtt, rtt_variance;
     21     char have_first_sample;
     22 };
     23 
     24 typedef struct ossl_rtt_info_st {
     25     /* As defined in RFC 9002. */
     26     OSSL_TIME smoothed_rtt, latest_rtt, rtt_variance, min_rtt;
     27 } OSSL_RTT_INFO;
     28 
     29 int ossl_statm_init(OSSL_STATM *statm);
     30 
     31 void ossl_statm_destroy(OSSL_STATM *statm);
     32 
     33 void ossl_statm_get_rtt_info(OSSL_STATM *statm, OSSL_RTT_INFO *rtt_info);
     34 
     35 void ossl_statm_update_rtt(OSSL_STATM *statm,
     36     OSSL_TIME ack_delay,
     37     OSSL_TIME override_latest_rtt);
     38 
     39 #endif
     40 
     41 #endif
     42