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/*
* iperf, Copyright (c) 2014, 2017, The Regents of the University of
* California, through Lawrence Berkeley National Laboratory (subject
* to receipt of any required approvals from the U.S. Dept. of
* Energy). All rights reserved.
*
* If you have questions about your rights to use or distribute this
* software, please contact Berkeley Lab's Technology Transfer
* Department at TTD@lbl.gov.
*
* NOTICE. This software is owned by the U.S. Department of Energy.
* As such, the U.S. Government has been granted for itself and others
* acting on its behalf a paid-up, nonexclusive, irrevocable,
* worldwide license in the Software to reproduce, prepare derivative
* works, and perform publicly and display publicly. Beginning five
* (5) years after the date permission to assert copyright is obtained
* from the U.S. Department of Energy, and subject to any subsequent
* five (5) year renewals, the U.S. Government is granted for itself
* and others acting on its behalf a paid-up, nonexclusive,
* irrevocable, worldwide license in the Software to reproduce,
* prepare derivative works, distribute copies to the public, perform
* publicly and display publicly, and to permit others to do so.
*
* This code is distributed under a BSD style license, see the LICENSE
* file for complete information.
*/
/*
* routines related to collection TCP_INFO using getsockopt()
*
* Brian Tierney, ESnet (bltierney@es.net)
*
* Note that this is only really useful on Linux.
* XXX: only standard on linux versions 2.4 and later
#
* FreeBSD has a limitted implementation that only includes the following:
* tcpi_snd_ssthresh, tcpi_snd_cwnd, tcpi_rcv_space, tcpi_rtt
* Based on information on http://wiki.freebsd.org/8.0TODO, I dont think this will be
* fixed before v8.1 at the earliest.
*
* OSX has no support.
*
* I think MS Windows does support TCP_INFO, but iperf3 does not currently support Windows.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <netinet/in.h>
#include <errno.h>
#include "iperf.h"
#include "iperf_api.h"
#include "iperf_locale.h"
/*************************************************************/
int
has_tcpinfo(void)
{
#if (defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)) \
&& defined(TCP_INFO)
return 1;
#else
return 0;
#endif
}
/*************************************************************/
int
has_tcpinfo_retransmits(void)
{
#if defined(linux) && defined(TCP_MD5SIG)
/* TCP_MD5SIG doesn't actually have anything to do with TCP
** retransmits, it just showed up in the same rev of the header
** file. If it's present then struct tcp_info has the
** tcpi_total_retrans field that we need; if not, not.
*/
return 1;
#else
#if defined(__FreeBSD__) && __FreeBSD_version >= 600000
return 1; /* Should work now */
#elif defined(__NetBSD__) && defined(TCP_INFO)
return 1;
#else
return 0;
#endif
#endif
}
/*************************************************************/
void
save_tcpinfo(struct iperf_stream *sp, struct iperf_interval_results *irp)
{
#if (defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)) && \
defined(TCP_INFO)
socklen_t tcp_info_length = sizeof(struct tcp_info);
if (getsockopt(sp->socket, IPPROTO_TCP, TCP_INFO, (void *)&irp->tcpInfo, &tcp_info_length) < 0)
iperf_err(sp->test, "getsockopt - %s", strerror(errno));
if (sp->test->debug) {
printf("tcpi_snd_cwnd %u tcpi_snd_mss %u tcpi_rtt %u\n",
irp->tcpInfo.tcpi_snd_cwnd, irp->tcpInfo.tcpi_snd_mss,
irp->tcpInfo.tcpi_rtt);
}
#endif
}
/*************************************************************/
long
get_total_retransmits(struct iperf_interval_results *irp)
{
#if defined(linux) && defined(TCP_MD5SIG)
return irp->tcpInfo.tcpi_total_retrans;
#elif defined(__FreeBSD__) && __FreeBSD_version >= 600000
return irp->tcpInfo.tcpi_snd_rexmitpack;
#elif defined(__NetBSD__) && defined(TCP_INFO)
return irp->tcpInfo.tcpi_snd_rexmitpack;
#else
return -1;
#endif
}
/*************************************************************/
/*
* Return snd_cwnd in octets.
*/
long
get_snd_cwnd(struct iperf_interval_results *irp)
{
#if defined(linux) && defined(TCP_MD5SIG)
return irp->tcpInfo.tcpi_snd_cwnd * irp->tcpInfo.tcpi_snd_mss;
#elif defined(__FreeBSD__) && __FreeBSD_version >= 600000
return irp->tcpInfo.tcpi_snd_cwnd;
#elif defined(__NetBSD__) && defined(TCP_INFO)
return irp->tcpInfo.tcpi_snd_cwnd * irp->tcpInfo.tcpi_snd_mss;
#else
return -1;
#endif
}
/*************************************************************/
/*
* Return rtt in usec.
*/
long
get_rtt(struct iperf_interval_results *irp)
{
#if defined(linux) && defined(TCP_MD5SIG)
return irp->tcpInfo.tcpi_rtt;
#elif defined(__FreeBSD__) && __FreeBSD_version >= 600000
return irp->tcpInfo.tcpi_rtt;
#elif defined(__NetBSD__) && defined(TCP_INFO)
return irp->tcpInfo.tcpi_rtt;
#else
return -1;
#endif
}
/*************************************************************/
/*
* Return rttvar in usec.
*/
long
get_rttvar(struct iperf_interval_results *irp)
{
#if defined(linux) && defined(TCP_MD5SIG)
return irp->tcpInfo.tcpi_rttvar;
#elif defined(__FreeBSD__) && __FreeBSD_version >= 600000
return irp->tcpInfo.tcpi_rttvar;
#elif defined(__NetBSD__) && defined(TCP_INFO)
return irp->tcpInfo.tcpi_rttvar;
#else
return -1;
#endif
}
/*************************************************************/
/*
* Return PMTU in bytes.
*/
long
get_pmtu(struct iperf_interval_results *irp)
{
#if defined(linux) && defined(TCP_MD5SIG)
return irp->tcpInfo.tcpi_pmtu;
#else
return -1;
#endif
}
/*************************************************************/
void
build_tcpinfo_message(struct iperf_interval_results *r, char *message)
{
#if defined(linux)
sprintf(message, report_tcpInfo, r->tcpInfo.tcpi_snd_cwnd, r->tcpInfo.tcpi_snd_ssthresh,
r->tcpInfo.tcpi_rcv_ssthresh, r->tcpInfo.tcpi_unacked, r->tcpInfo.tcpi_sacked,
r->tcpInfo.tcpi_lost, r->tcpInfo.tcpi_retrans, r->tcpInfo.tcpi_fackets,
r->tcpInfo.tcpi_rtt, r->tcpInfo.tcpi_reordering);
#endif
#if defined(__FreeBSD__)
sprintf(message, report_tcpInfo, r->tcpInfo.tcpi_snd_cwnd,
r->tcpInfo.tcpi_rcv_space, r->tcpInfo.tcpi_snd_ssthresh, r->tcpInfo.tcpi_rtt);
#endif
#if defined(__NetBSD__) && defined(TCP_INFO)
sprintf(message, report_tcpInfo, r->tcpInfo.tcpi_snd_cwnd,
r->tcpInfo.tcpi_rcv_space, r->tcpInfo.tcpi_snd_ssthresh, r->tcpInfo.tcpi_rtt);
#endif
}
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