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);
}
void
traffic_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) /* connection info for this one */
{
struct tcphdr *ptcp = (struct tcphdr *) ((char *)pip + 4*IP_HL(pip));
struct traffic_info *pti1 = FindPort(ntohs(ptcp->th_sport));
struct traffic_info *pti2 = FindPort(ntohs(ptcp->th_dport));
u_long bytes = ntohs(pip->ip_len);
static timeval last_time = {0,0};
struct conn_info *pci = mod_data;
int was_rexmit = 0;
/* in case files aren't set up yet */
traffic_init_files();
/* if neither port is interesting, then ignore this one */
if (!pti1 && !pti2) {
return;
}
/* OK, this connection is now active */
pci->wasactive = 1;
/* check to see if it's really "open" (traffic in both directions) */
if (!pci->wasopen) {
if ((ptp->a2b.packets > 0) && (ptp->b2a.packets > 0)) {
/* bidirectional: OK, we'll call it open */
pci->wasopen = 1;
pci->isopen = 1;
++num_opens;
++ttl_num_opens;
++open_conns;
/* instantaneous opens and closes */
if (doplot_i_open) {
DoplotIOpen(ntohs(ptcp->th_dport), TRUE);
DoplotIOpen(ntohs(ptcp->th_sport), TRUE);
DoplotIOpen(0, TRUE);
}
}
}
/* add to port-specific counters */
if (pti1) {
pti1->nbytes += bytes;
pti1->npackets += 1;
}
if (pti2) {
pti2->nbytes += bytes;
pti2->npackets += 1;
}
/* add to GLOBAL counters */
ports[0]->nbytes += bytes;
ports[0]->npackets += 1;
ports[0]->npureacks += 1;
/* see if we're closing it */
if (RESET_SET(ptcp) ||
(FIN_SET(ptcp) && /* find in BOTH directions */
((ptp->a2b.fin_count>0) && (ptp->b2a.fin_count>0)))) {
if (pci->isopen) {
pci->isopen = 0;
++num_closes;
--open_conns;
/* instantaneous opens and closes */
if (doplot_i_open) {
DoplotIOpen(ntohs(ptcp->th_dport), FALSE);
DoplotIOpen(ntohs(ptcp->th_sport), FALSE);
DoplotIOpen(0, FALSE);
}
}
}
/* half open conns */
if (FIN_SET(ptcp)) {
if ((ptp->a2b.fin_count>0) && (ptp->b2a.fin_count>0)) {
if (pci->halfopen) {
/* fully closed now */
--num_halfopens;
pci->halfopen = 0;
}
} else if (!pci->halfopen) {
/* half open now */
++num_halfopens;
pci->halfopen = 1;
}
}
/* check losses */
if (pci->last_dupacks != ptp->a2b.rtt_triple_dupack+
ptp->b2a.rtt_triple_dupack) {
pci->last_dupacks = ptp->a2b.rtt_triple_dupack+
ptp->b2a.rtt_triple_dupack;
++dupacks;
++ttl_dupacks;
}
if (pci->last_rexmits != ptp->a2b.rexmit_pkts+ptp->b2a.rexmit_pkts) {
pci->last_rexmits = ptp->a2b.rexmit_pkts+ptp->b2a.rexmit_pkts;
was_rexmit = 1;
++rexmits;
++ttl_rexmits;
}
/* add to total data counters */
data_nbytes_all += bytes;
if (!was_rexmit)
data_nbytes_nonrexmit += bytes;
/* RTT stats */
if (ACK_SET(ptcp)) {
tcb *ptcb;
int rtt;
/* see which of the 2 TCB's this goes with */
if (ptp->addr_pair.a_port == ntohs(ptcp->th_dport))
ptcb = &ptp->a2b;
else
ptcb = &ptp->b2a;
/* check the rtt counter of the last sample */
rtt = ptcb->rtt_last / 1000.0;
if ((pci->last_rtts != ptcb->rtt_count + ptcb->rtt_amback) &&
(ptcb->rtt_last != 0.0) &&
(rtt > rtt_minvalid) && (rtt <= rtt_maxvalid)) {
/* sample is only valid when one of these counters is higher */
pci->last_rtts = ptcb->rtt_count + ptcb->rtt_amback;
/* keep stats */
rtt_ttl += rtt;
ttl_rtt_ttl += rtt;
++rtt_samples;
++ttl_rtt_samples;
/* also, remember min and max */
if ((rtt_max == -1) || (rtt_max < rtt))
rtt_max = rtt;
if ((rtt_min == -1) || (rtt_min > rtt))
rtt_min = rtt;
if (ldebug > 9)
printf("Rtt: %d, min:%d, max:%d\n",
rtt, rtt_min, rtt_max);
}
}
/* see if this is now "long duration" */
if (!pci->islong) {
int etime_msecs = elapsed(ptp->first_time,current_time);
if (etime_msecs/1000000 > longconn_duration) {
pci->islong = 1;
}
}
/* count "pure acks" (no data) */
if (ACK_SET(ptcp)) {
int tcp_length, tcp_data_length;
tcp_length = getpayloadlength(pip, plast);
tcp_data_length = tcp_length - (4 * TH_OFF(ptcp));
if (tcp_data_length == 0) {
if (pti1) {
++pti1->npureacks;
}
if (pti2) {
++pti2->npureacks;
}
}
}
/* determine elapsed time and age the samples */
if (elapsed(last_time,current_time)/1000000.0 > age_interval) {
AgeTraffic();
last_time = current_time;
}
}