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mod_rttgraph.c
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mod_rttgraph.c
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/*
* Copyright (c) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
* 2002, 2003, 2004
* Ohio University.
*
* ---
*
* Starting with the release of tcptrace version 6 in 2001, tcptrace
* is licensed under the GNU General Public License (GPL). We believe
* that, among the available licenses, the GPL will do the best job of
* allowing tcptrace to continue to be a valuable, freely-available
* and well-maintained tool for the networking community.
*
* Previous versions of tcptrace were released under a license that
* was much less restrictive with respect to how tcptrace could be
* used in commercial products. Because of this, I am willing to
* consider alternate license arrangements as allowed in Section 10 of
* the GNU GPL. Before I would consider licensing tcptrace under an
* alternate agreement with a particular individual or company,
* however, I would have to be convinced that such an alternative
* would be to the greater benefit of the networking community.
*
* ---
*
* This file is part of Tcptrace.
*
* Tcptrace was originally written and continues to be maintained by
* Shawn Ostermann with the help of a group of devoted students and
* users (see the file 'THANKS'). The work on tcptrace has been made
* possible over the years through the generous support of NASA GRC,
* the National Science Foundation, and Sun Microsystems.
*
* Tcptrace is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Tcptrace is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tcptrace (in the file 'COPYING'); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Author: Shawn Ostermann
* School of Electrical Engineering and Computer Science
* Ohio University
* Athens, OH
* ostermann@cs.ohiou.edu
* http://www.tcptrace.org/
*/
#include "tcptrace.h"
static char const GCC_UNUSED rcsid[] =
"$Header$";
#ifdef LOAD_MODULE_RTTGRAPH
#include <limits.h>
#include "mod_rttgraph.h"
/* a histogram structure */
struct hist {
u_long num_buckets;
u_long num_samples;
u_long *buckets;
u_long z;
};
#define NUM_SLICES 10
struct hist3d {
struct hist rtt;
struct hist rtt_diff_slices[NUM_SLICES+1];
};
struct samples {
u_long num_samples;
u_long max_samples;
u_short max;
u_short min;
u_short *samples;
};
/* what we keep for each tcb */
struct rtt_tcb {
tcb *ptcb;
struct samples samples;
};
/* info kept for each connection */
static struct rttgraph_info {
tcp_pair *ptp;
struct rtt_tcb a2b;
struct rtt_tcb b2a;
struct rttgraph_info *next;
} *rttgraphhead = NULL, *rttgraphtail = NULL;
/* local routines */
static struct rttgraph_info *MakeRttgraphRec();
static void MakeBuckets(struct hist *phist, u_int num_buckets);
static void AddSample(struct samples *psamp, u_short sample);
static void PlotHist(MFILE *f,struct hist *phist);
static void PlotOne(struct rttgraph_info *prttg);
/* Mostly as a module example, here's a plug in that records RTTGRAPH info */
int
rttgraph_init(
int argc,
char *argv[])
{
int i;
int enable=0;
/* look for "-xrttgraph[N]" */
for (i=1; i < argc; ++i) {
if (!argv[i])
continue; /* argument already taken by another module... */
if (strncmp(argv[i],"-x",2) == 0) {
if (strncasecmp(argv[i]+2,"rttgraph",4) == 0) {
/* I want to be called */
enable = 1;
printf("mod_rttgraph: Capturing RTTGRAPH traffic\n");
argv[i] = NULL;
}
}
}
if (!enable)
return(0); /* don't call me again */
return(1); /* TRUE means call rttgraph_read and rttgraph_done later */
}
static void
MakeBuckets(
struct hist *phist,
u_int num_buckets)
{
u_long *new_ptr;
++num_buckets; /* 0-based arrays */
if (num_buckets <= phist->num_buckets)
return; /* nothing to do */
/* round num_buckets up to multiple of 100 */
if ((num_buckets % 100) != 0) {
num_buckets = 100 * ((num_buckets+99)/100);
}
/* either create the space or expand it */
if (phist->buckets) {
new_ptr = ReallocZ(phist->buckets,
phist->num_buckets * sizeof(u_long),
num_buckets * sizeof(u_long));
} else {
new_ptr = MallocZ(num_buckets * sizeof(u_long));
}
/* remember what we did */
phist->num_buckets = num_buckets;
phist->buckets = new_ptr;
}
static void
AddSample(
struct samples *psamp,
u_short sample)
{
/* printf("AddSample(%d) called\n", sample); */
/* make sure we have enough space */
if ((psamp->num_samples+2) > (psamp->max_samples)) {
u_long new_samples = psamp->max_samples + 100;
u_short *new_ptr;
if (psamp->samples) {
new_ptr = ReallocZ(psamp->samples,
psamp->max_samples * sizeof(u_short),
new_samples * sizeof(u_short));
} else {
new_ptr = MallocZ(new_samples * sizeof(u_short));
}
psamp->max_samples = new_samples;
psamp->samples = new_ptr;
}
/* remember what we did */
psamp->samples[psamp->num_samples++] = sample;
if (sample > psamp->max)
psamp->max = sample;
if (sample < psamp->max)
psamp->min = sample;
}
static struct rttgraph_info *
MakeRttgraphRec()
{
struct rttgraph_info *prttg;
prttg = MallocZ(sizeof(struct rttgraph_info));
/* (...leave the samples pointer NULL until first needed) */
prttg->a2b.samples.max_samples = 0;
prttg->a2b.samples.max = 0; prttg->a2b.samples.min = USHRT_MAX;
prttg->b2a.samples.max_samples = 0;
prttg->b2a.samples.max = 0; prttg->b2a.samples.min = USHRT_MAX;
/* chain it in (at the tail of the list) */
if (rttgraphhead == NULL) {
rttgraphhead = prttg;
rttgraphtail = prttg;
} else {
rttgraphtail->next = prttg;
rttgraphtail = prttg;
}
return(prttg);
}
void
rttgraph_read(
struct ip *pip, /* the packet */
tcp_pair *ptp, /* info I have about this connection */
void *plast, /* past byte in the packet */
void *mod_data) /* module specific info for this connection */
{
struct tcphdr *ptcp;
struct rttgraph_info *prttg = mod_data;
struct rtt_tcb *prtcb;
tcb *ptcb;
double rtt_us;
u_long rtt_ms;
/* find the start of the TCP header */
ptcp = (struct tcphdr *) ((char *)pip + 4*IP_HL(pip));
/* make sure there we could have a RTT sample */
if (!ACK_SET(ptcp))
return; /* no RTT info */
/* see which direction it is, if we don't know yet */
ptcb = ptp2ptcb(ptp,pip,ptcp);
if (ptcb == prttg->a2b.ptcb)
prtcb = &prttg->a2b;
else if (ptcb == prttg->b2a.ptcb)
prtcb = &prttg->b2a;
else {
fprintf(stderr,
"rttgraph_read: INTERNAL error (can't kind tcb)!!\n");
exit(1);
}
/* grab the RTT */
rtt_us = prtcb->ptcb->rtt_last;
if (rtt_us == 0.0)
return; /* not a valid sample */
/* convert to ms buckets */
rtt_ms = (u_long) (rtt_us / 1000.0);
if (debug && (rtt_ms == 0))
printf("rtt_ms is 0, rtt_us was %f\n", rtt_us);
/* add in the sample RTT */
AddSample(&prtcb->samples, rtt_ms);
}
static void
DoHist(
struct samples *psamp)
{
int i;
struct hist3d hist3d;
MFILE *f;
u_long sum;
int slice;
int base_z;
int slice_size;
if (psamp->num_samples == 0)
return;
printf("Samples: %lu\n", psamp->num_samples);
printf("Min: %u\n", psamp->min);
printf("Max: %u\n", psamp->max);
/* init */
hist3d.rtt.num_buckets = 0;
memset(&hist3d.rtt,'\00',sizeof(struct hist));
MakeBuckets(&hist3d.rtt, psamp->num_samples);
for (i=0; i < NUM_SLICES; ++i) {
memset(&hist3d.rtt_diff_slices[i],'\00',sizeof(struct hist));
MakeBuckets(&hist3d.rtt_diff_slices[i], psamp->num_samples);
}
/* calculate the global histogram */
for (i=0; i < psamp->num_samples; ++i) {
u_short rtt = psamp->samples[i];
++hist3d.rtt.buckets[rtt];
++hist3d.rtt.num_samples;
}
/* find the slices, same amount of data in each slice */
sum = 0;
slice = 0;
base_z = 0;
slice_size = psamp->num_samples / NUM_SLICES;
for (i=0; i < psamp->num_samples; ++i) {
u_short count = hist3d.rtt.buckets[i];
sum += count;
if (sum > slice_size) {
hist3d.rtt_diff_slices[slice].z = base_z;
++slice;
sum = 0;
base_z = i+1;
}
}
for (; slice < NUM_SLICES; ++slice)
hist3d.rtt_diff_slices[slice].z = ULONG_MAX;
/* add the slice data */
for (i=1; i < psamp->num_samples; ++i) {
u_short rtt = psamp->samples[i];
u_short prev_rtt = psamp->samples[i-1];
/* see which slice holds the prev_rtt */
for (slice = NUM_SLICES-1; slice >= 0; --slice) {
if (prev_rtt > hist3d.rtt_diff_slices[slice].z)
break;
}
++hist3d.rtt_diff_slices[slice].buckets[rtt];
++hist3d.rtt_diff_slices[slice].num_samples;
}
if ((f = Mfopen("rtt.dat","w")) == NULL) {
perror("rtt.dat");
exit (1);
}
printf("Total Histogram\n");
hist3d.rtt.z = -1;
PlotHist(f,&hist3d.rtt);
Mfclose(f);
if ((f = Mfopen("rtt3d.dat","w")) == NULL) {
perror("rtt.dat");
exit (1);
}
for (i=0; i < NUM_SLICES; ++i) {
struct hist *phist = &hist3d.rtt_diff_slices[i];
printf("Slice %d Histogram - base: %lu ms\n", i, phist->z);
PlotHist(f,phist);
}
/* plot the "connections" */
#ifdef BROKEN
for (i=0; i < psamp->max; i+=10) {
for (slice=0; slice < NUM_SLICES; ++slice) {
struct hist *phist = &hist3d.rtt_diff_slices[slice];
u_long count = phist->buckets[i];
float percent = (float)count / phist->num_samples;
if (phist->num_samples == 0)
continue;
fprintf(f,"%4d %lu %.2f\n", i, phist->z, 100 * percent);
}
fprintf(f,"\n");
}
#endif /* BROKEN */
Mfclose(f);
}
static void
PlotHist(
MFILE *f,
struct hist *phist)
{
int ms;
int z = phist->z;
if (phist->buckets == NULL)
return;
printf(" %lu samples\n", phist->num_samples);
for (ms=0; ms < phist->num_buckets; ++ms) {
u_long count = phist->buckets[ms];
float percent;
if (count == 0 || phist->num_samples == 0)
continue;
percent = (float)count / phist->num_samples;
printf(" %4d %5lu %5.2f\n", ms, count, 100 * percent);
if (z == -1)
Mfprintf(f,"%4d %.2f\n", ms, 100 * percent);
else
Mfprintf(f,"%4d %d %.2f\n", ms, z, 100 * percent);
}
Mfprintf(f,"\n");
}
static void
PlotOne(
struct rttgraph_info *prttg)
{
tcp_pair *ptp = prttg->ptp;
printf("%s ==> %s (%s2%s)\n",
ptp->a_endpoint, ptp->b_endpoint,
ptp->a2b.host_letter, ptp->b2a.host_letter);
DoHist(&prttg->a2b.samples);
printf("%s ==> %s (%s2%s)\n",
ptp->b_endpoint, ptp->a_endpoint,
ptp->b2a.host_letter, ptp->a2b.host_letter);
DoHist(&prttg->b2a.samples);
}
void
rttgraph_done(void)
{
struct rttgraph_info *prttg;
for (prttg=rttgraphhead; prttg; prttg=prttg->next) {
PlotOne(prttg);
}
}
void
rttgraph_usage(void)
{
printf("\t-xrttgraph\tprint info about rttgraph traffic\n");
}
void *
rttgraph_newconn(
tcp_pair *ptp)
{
struct rttgraph_info *prttg;
prttg = MakeRttgraphRec();
prttg->ptp = ptp;
prttg->a2b.ptcb = &ptp->a2b;
prttg->b2a.ptcb = &ptp->b2a;
return(prttg);
}
#endif /* LOAD_MODULE_RTTGRAPH */