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/*---------------------------------------------------------------
* Copyright (c) 2021
* Broadcom Corporation
* All Rights Reserved.
*---------------------------------------------------------------
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated
* documentation files (the "Software"), to deal in the Software
* without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and
* the following disclaimers.
*
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimers in the documentation and/or other materials
* provided with the distribution.
*
*
* Neither the name of Broadcom Coporation,
* nor the names of its contributors may be used to endorse
* or promote products derived from this Software without
* specific prior written permission.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
* ________________________________________________________________
*
* gettcpinfo.c
* Suppport for tcp info in a portable way
*
* Hi Bob,
*
* I would suggest that the most interesting metrics from tcp_info would be:
*
* double ecn_mark_rate = (double)tcpi_delivered_ce / (double)tcpi_delivered
* double retransmit_rate = (double)(tcpi_total_retrans - tcpi_dsack_dups) / (double)tcpi_data_segs_out
* double smoothed_rtt = tcpi_rtt
*
* neal
*
* by Robert J. McMahon (rjmcmahon@rjmcmahon.com, bob.mcmahon@broadcom.com)
* -------------------------------------------------------------------
*/
#include "headers.h"
#include "gettcpinfo.h"
#ifdef HAVE_THREAD_DEBUG
// needed for thread_debug
#include "Thread.h"
#endif
#if HAVE_TCP_STATS
inline void gettcpinfo (int sock, struct iperf_tcpstats *stats) {
assert(stats);
#if HAVE_DECL_TCP_INFO
struct tcp_info tcp_info_buf;
socklen_t tcp_info_length = sizeof(struct tcp_info);
if ((sock > 0) && !(getsockopt(sock, IPPROTO_TCP, TCP_INFO, &tcp_info_buf, &tcp_info_length) < 0)) {
#if HAVE_STRUCT_TCP_INFO_TCPI_SND_CWND
stats->cwnd_packets = tcp_info_buf.tcpi_snd_cwnd;
#else
stats->cwnd_packets = -1;
#endif
#if HAVE_STRUCT_TCP_INFO_TCPI_SND_CWND && HAVE_STRUCT_TCP_INFO_TCPI_SND_MSS
stats->cwnd = tcp_info_buf.tcpi_snd_cwnd * tcp_info_buf.tcpi_snd_mss / 1024;
#else
stats->cwnd = -1;
#endif
stats->rtt = tcp_info_buf.tcpi_rtt;
stats->rttvar = tcp_info_buf.tcpi_rttvar;
stats->retry_tot = tcp_info_buf.tcpi_total_retrans;
#if HAVE_STRUCT_TCP_INFO_TCPI_SND_MSS
stats->mss_negotiated = tcp_info_buf.tcpi_snd_mss;
#else
stats->mss_negotiated = -1;
#endif
#if HAVE_TCP_INFLIGHT
stats->packets_in_flight = (tcp_info_buf.tcpi_unacked - tcp_info_buf.tcpi_sacked - \
tcp_info_buf.tcpi_lost + tcp_info_buf.tcpi_retrans);
stats->bytes_in_flight = stats->packets_in_flight * tcp_info_buf.tcpi_snd_mss / 1024;
#endif
stats->isValid = true;
#elif HAVE_DECL_TCP_CONNECTION_INFO
struct tcp_connection_info tcp_info_buf;
socklen_t tcp_info_length = sizeof(struct tcp_connection_info);
if ((sock > 0) && !(getsockopt(sock, IPPROTO_TCP, TCP_CONNECTION_INFO, &tcp_info_buf, &tcp_info_length) < 0)) {
#ifdef __APPLE__
stats->cwnd = tcp_info_buf.tcpi_snd_cwnd / 1024;
stats->cwnd_packets = -1;
#else
stats->cwnd = tcp_info_buf.tcpi_snd_cwnd * tcp_info_buf.tcpi_maxseg / 1024;
stats->cwnd_packets = tcp_info_buf.tcpi_snd_cwnd;
#endif
stats->rtt = tcp_info_buf.tcpi_rttcur * 1000; // OS X units is ms
stats->rttvar = tcp_info_buf.tcpi_rttvar;
stats->retry_tot = tcp_info_buf.tcpi_txretransmitpackets;
stats->mss_negotiated = tcp_info_buf.tcpi_maxseg;
stats->isValid = true;
#endif
} else {
stats->rtt = 1;
stats->isValid = false;
}
}
inline void tcpstats_copy (struct iperf_tcpstats *stats_dst, struct iperf_tcpstats *stats_src) {
stats_dst->cwnd = stats_src->cwnd;
stats_dst->cwnd_packets = stats_src->cwnd_packets;
stats_dst->rtt = stats_src->rtt;
stats_dst->rttvar = stats_src->rttvar;
stats_dst->mss_negotiated = stats_src->mss_negotiated;
stats_dst->retry_tot = stats_src->retry_tot;
stats_dst->connecttime = stats_src->connecttime;
stats_dst->isValid = stats_src->isValid;
#if HAVE_TCP_INFLIGHT
stats_dst->packets_in_flight = stats_src->packets_in_flight;
stats_dst->bytes_in_flight = stats_src->bytes_in_flight;
#endif
}
#else
#if WIN32
inline void gettcpinfo (SOCKET sock, struct iperf_tcpstats *stats) {
#else
inline void gettcpinfo (int sock, struct iperf_tcpstats *stats) {
#endif
stats->rtt = 1;
stats->isValid = false;
};
inline void tcpstats_copy (struct iperf_tcpstats *stats_dst, struct iperf_tcpstats *stats_src) {
stats_dst->rtt = stats_src->rtt;
stats_dst->isValid = stats_src->isValid;
}
#endif
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