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udpst_data.c
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/*
* Copyright (c) 2020, Broadband Forum
* Copyright (c) 2020, AT&T Communications
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*
* UDP Speed Test - udpst_data.c
*
* This file manages the sending and servicing of both load and status PDUs. It
* handles traffic data collection, sending rate adjustments, and any output
* messaging of test status and results.
*
* Author Date Comments
* -------------------- ---------- ----------------------------------
* Len Ciavattone 01/16/2019 Created
* Len Ciavattone 10/18/2019 Add param for load sample period
* Len Ciavattone 11/04/2019 Add minimum delays to summary
* Len Ciavattone 06/16/2020 Add dual-stack (IPv6) support
* Len Ciavattone 07/02/2020 Added (HMAC-SHA256) authentication
* Len Ciavattone 08/04/2020 Rearranged source files
* Len Ciavattone 09/03/2020 Added __linux__ conditionals
* Len Ciavattone 09/05/2020 Allow socket_error() & receive_trunc()
* to be redefined externally
* Len Ciavattone 09/18/2020 Use usec instead of ms for delta time
* values (new protocol version required)
* Len Ciavattone 10/09/2020 Add support for bimodal maxima (and
* include sub-interval count in output)
* Len Ciavattone 11/10/2020 Add option to ignore OoO/Dup
* Daniel Egger 02/22/2021 Add sendmsg support
* Len Ciavattone 10/13/2021 Refresh with clang-format
* Add TR-181 fields & sub-int. in JSON
* Add JSON bimodal output
* Add JSON error support to send_proc()
* Add interface traffic rate support
* Len Ciavattone 12/08/2021 Add starting sending rate
* Len Ciavattone 12/17/2021 Add payload randomization
* Len Ciavattone 12/24/2021 Handle interface byte counter wrap
* Len Ciavattone 01/08/2022 Check burstsize >1 if forcing to 1
* Len Ciavattone 02/02/2022 Add rate adj. algo. selection
* Al Morton 04/12/2022 Type C algoithm, Multiply and Retry
* Len Ciavattone 12/26/2022 Add random payload size support
* Len Ciavattone 12/29/2022 Add single test option on server
* Len Ciavattone 01/14/2023 Add multi-connection support
* Len Ciavattone 03/22/2023 Add GSO and GRO optimizations
* Len Ciavattone 03/25/2023 GRO replaced w/recvmmsg+truncation
* Len Ciavattone 04/04/2023 Add optional rate limiting
* Len Ciavattone 05/24/2023 Add data output (export) capability
* Len Ciavattone 10/01/2023 Updated ErrorStatus values
*
*/
#define UDPST_DATA
#ifdef __linux__
#define _GNU_SOURCE
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <limits.h>
#include <fcntl.h>
#include <time.h>
#include <math.h>
#include <unistd.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <netinet/ip.h> // For GSO support
#include <netinet/udp.h> // For GSO support
#ifdef AUTH_KEY_ENABLE
#include <openssl/hmac.h>
#include <openssl/x509.h>
#endif
#else
#include "../udpst_data_alt1.h"
#endif
//
#include "cJSON.h"
#include "udpst_common.h"
#include "udpst_protocol.h"
#include "udpst.h"
#include "udpst_data.h"
#ifndef __linux__
#include "../udpst_data_alt2.h"
#endif
//----------------------------------------------------------------------------
//
// Internal function prototypes
//
int send_loadpdu(int, int);
int adjust_sending_rate(int);
int output_currate(int);
int output_maxrate(int);
double get_rate(int, struct subIntStats *, int);
#ifdef __linux__
int socket_error(int, int, char *);
int receive_trunc(int, int, int);
#endif
void sis_copy(struct subIntStats *, struct subIntStats *, BOOL);
void output_warning(int, int);
double upd_intf_stats(BOOL);
void output_minimum(int);
void output_debug(int);
//----------------------------------------------------------------------------
//
// External data
//
extern int errConn, monConn, aggConn;
extern char scratch[STRING_SIZE];
extern struct configuration conf;
extern struct repository repo;
extern struct connection *conn;
//
extern cJSON *json_top, *json_output, *json_siArray;
extern char json_errbuf[STRING_SIZE], json_errbuf2[STRING_SIZE];
//----------------------------------------------------------------------------
//
// Global data
//
#define LOSSRATIO_TEXT "LossRatio: %.2E, "
#define DELIVERED_TEXT "Delivered(%%): %6.2f, "
#define SUMMARY_TEXT "Loss/OoO/Dup: %u/%u/%u, OWDVar(ms): %u/%u/%u, RTTVar(ms): %u-%u, Mbps(L3/IP): %.2f%s\n"
#define MINIMUM_TEXT "Minimum One-Way Delay(ms): %d [w/clock diff], Round-Trip Time(ms): %u"
#define MINIMUM_FINAL MINIMUM_TEXT ", Active Connections: %d\n"
#define DEBUG_STATS "[Loss/OoO/Dup: %u/%u/%u, OWDVar(ms): %u/%u/%u, RTTVar(ms): %d]"
#define CLIENT_DEBUG "[%d]DEBUG Status Feedback " DEBUG_STATS " Mbps(L3/IP): %.2f\n"
#define SERVER_DEBUG "[%d]DEBUG Rate Adjustment " DEBUG_STATS " SRIndex: %d\n"
static char scratch2[STRING_SIZE + 32]; // Allow for log file timestamp prefix
static int mmsgDataSize[RECVMMSG_SIZE]; // Received data size of each message
//----------------------------------------------------------------------------
// Function definitions
//----------------------------------------------------------------------------
//
// Populate the static part of the our message header
//
static void _populate_header(struct loadHdr *lHdr, struct connection *c, unsigned int rttRespDelay) {
lHdr->loadId = htons(LOAD_ID);
lHdr->testAction = (uint8_t) c->testAction;
lHdr->rxStopped = (uint8_t) c->rxStoppedLoc;
// lpduSeqNo populated by the send function
// udpPayload populated by the send function
lHdr->spduSeqErr = htons((uint16_t) c->spduSeqErr);
lHdr->spduTime_sec = htonl((uint32_t) c->spduTime.tv_sec);
lHdr->spduTime_nsec = htonl((uint32_t) c->spduTime.tv_nsec);
lHdr->lpduTime_sec = htonl((uint32_t) repo.systemClock.tv_sec);
lHdr->lpduTime_nsec = htonl((uint32_t) repo.systemClock.tv_nsec);
lHdr->rttRespDelay = htons((uint16_t) rttRespDelay);
lHdr->reserved1 = 0;
}
//
// Randomize payload of datagram (via single call of random())
//
static void _randomize_payload(char *buffer, unsigned int length) {
register long int rvar = random(); // Obtain random value (0 - RAND_MAX)
register long int *b, *rd = (long int *) repo.randData;
register unsigned int len = length, i;
#if LONG_MAX > 2147483647L
rvar |= rvar << 32; // Copy value to upper half when using 64 bits
#endif
//
// Randomize initial bytes while aligning buffer on long int boundary
//
i = 0;
while (len && (unsigned long int) buffer % sizeof(long int)) {
*buffer++ = (char) (rvar >> i++); // Keep it very simple
len--;
}
//
// Randomize majority as long int values using randomized seed data
//
b = (long int *) buffer;
while (len > sizeof(long int)) {
*b++ = rvar ^ *rd++; // Also simple (but more efficient)
len -= sizeof(long int);
}
buffer = (char *) b;
//
// Randomize any remaining bytes
//
i = 8; // Something different than initial bytes
while (len) {
*buffer++ = (char) (rvar >> i++); // Back to very simple
len--;
}
}
#if defined(HAVE_SENDMMSG)
#if defined(HAVE_GSO)
//
// Send a burst of messages using GSO (Generic Segmentation Offload)
//
static void _sendmmsg_gso(int connindex, int totalburst, int burstsize, unsigned int payload, unsigned int addon) {
register struct connection *c = &conn[connindex];
char *sndbuf, *nextsndbuf, cmsgbuf[GSO_CMSG_SIZE * MMSG_SEGMENTS] = {0};
unsigned int uvar, rttrd = 0, totalsize;
int i, j, var;
struct cmsghdr *cmsg;
struct mmsghdr mmsg[MMSG_SEGMENTS];
struct iovec iov[MMSG_SEGMENTS];
struct timespec tspecvar;
//
// Calculate RTT response delay
//
if (tspecisset(&c->pduRxTime)) {
tspecminus(&repo.systemClock, &c->pduRxTime, &tspecvar);
rttrd = (unsigned int) tspecmsec(&tspecvar);
}
//
// Prepare send structures
//
memset(mmsg, 0, sizeof(mmsg));
if (c->randPayload) {
sndbuf = repo.sndBufRand;
} else {
sndbuf = repo.sndBuffer;
}
j = 0; // Message count
cmsg = (struct cmsghdr *) cmsgbuf;
while (totalburst > 0) {
//
// Fill send buffer until GSO limit or burst completion
//
totalsize = 0;
nextsndbuf = sndbuf;
for (i = 0; i < totalburst; i++) {
if (i < burstsize)
uvar = payload;
else
uvar = addon;
//
// Check for GSO limits
//
if (i >= UDP_MAX_SEGMENTS) // Segment limit
break;
if (totalsize + uvar > IP_MAXPACKET) // Size limit
break;
//
// Build load PDU (including corresponding control message on first one)
//
struct loadHdr *lHdr = (struct loadHdr *) nextsndbuf;
_populate_header(lHdr, c, rttrd);
lHdr->lpduSeqNo = htonl((uint32_t) ++c->lpduSeqNo);
lHdr->udpPayload = htons((uint16_t) uvar);
if (c->randPayload) {
_randomize_payload((char *) lHdr + sizeof(struct loadHdr), uvar - sizeof(struct loadHdr));
}
if (i == 0) {
cmsg->cmsg_len = GSO_CMSG_LEN;
cmsg->cmsg_level = SOL_UDP;
cmsg->cmsg_type = UDP_SEGMENT;
*((uint16_t *) CMSG_DATA(cmsg)) = (uint16_t) uvar;
}
totalsize += uvar;
nextsndbuf += payload;
}
totalburst -= i;
if (burstsize > 0)
burstsize -= i;
//
// Setup message structure for buffer
//
iov[j].iov_base = (void *) sndbuf;
iov[j].iov_len = (size_t) totalsize;
mmsg[j].msg_hdr.msg_iov = &iov[j];
mmsg[j].msg_hdr.msg_iovlen = 1;
mmsg[j].msg_hdr.msg_control = cmsg;
mmsg[j].msg_hdr.msg_controllen = GSO_CMSG_SIZE;
j++;
//
// Advance to next send buffer
//
sndbuf += DEF_BUFFER_SIZE;
cmsg = (struct cmsghdr *) ((char *) cmsg + GSO_CMSG_SIZE);
}
//
// Send complete burst with single system call
//
// NOTE: Certain error conditions are expected when overloading an interface
//
var = sendmmsg(c->fd, mmsg, j, 0);
if (var == -1 && errno == EINVAL) { // Flag GSO incompatibility
var = sprintf(scratch, "ERROR: GSO incompatible with IP fragmentation (disable jumbo sizes or increase MTU)\n");
send_proc(errConn, scratch, var);
tspeccpy(&c->endTime, &repo.systemClock); // End testing
return;
}
if (!conf.errSuppress) {
if (var < 0) {
//
// An error of EAGAIN (Resource temporarily unavailable) indicates the send buffer is full
//
if ((var = socket_error(connindex, errno, "SENDMMSG+GSO")) > 0)
send_proc(errConn, scratch, var);
} else if (var < j) {
//
// Not all messages sent indicates the send buffer is full
//
var = sprintf(scratch, "[%d]SENDMMSG+GSO INCOMPLETE: Only %d out of %d sent\n", connindex, var, j);
send_proc(errConn, scratch, var);
}
}
}
#endif // HAVE_GSO
//
// Send a burst of messages using the Linux 3.0+ only sendmmsg syscall
//
static void _sendmmsg_burst(int connindex, int totalburst, int burstsize, unsigned int payload, unsigned int addon) {
register struct connection *c = &conn[connindex];
static struct mmsghdr mmsg[MAX_BURST_SIZE]; // Static array
static struct iovec iov[MAX_BURST_SIZE]; // Static array
unsigned int uvar, rttrd = 0;
char *nextsndbuf;
int i, var;
struct timespec tspecvar;
//
// Calculate RTT response delay
//
if (tspecisset(&c->pduRxTime)) {
tspecminus(&repo.systemClock, &c->pduRxTime, &tspecvar);
rttrd = (unsigned int) tspecmsec(&tspecvar);
}
//
// Prepare send structures
//
memset(mmsg, 0, totalburst * sizeof(struct mmsghdr));
if (c->randPayload) {
nextsndbuf = repo.sndBufRand;
} else {
nextsndbuf = repo.sndBuffer;
}
for (i = 0; i < totalburst; i++) {
struct loadHdr *lHdr = (struct loadHdr *) nextsndbuf;
_populate_header(lHdr, c, rttrd);
lHdr->lpduSeqNo = htonl((uint32_t) ++c->lpduSeqNo);
if (i < burstsize)
uvar = payload;
else
uvar = addon;
lHdr->udpPayload = htons((uint16_t) uvar);
if (c->randPayload) {
_randomize_payload((char *) lHdr + sizeof(struct loadHdr), uvar - sizeof(struct loadHdr));
}
//
// Setup corresponding message structure
//
iov[i].iov_base = (void *) lHdr;
iov[i].iov_len = (size_t) uvar;
mmsg[i].msg_hdr.msg_iov = &iov[i];
mmsg[i].msg_hdr.msg_iovlen = 1;
nextsndbuf += payload;
}
//
// Send complete burst with single system call
//
// NOTE: Certain error conditions are expected when overloading an interface
//
var = sendmmsg(c->fd, mmsg, totalburst, 0);
if (!conf.errSuppress) {
if (var < 0) {
//
// An error of EAGAIN (Resource temporarily unavailable) indicates the send buffer is full
//
if ((var = socket_error(connindex, errno, "SENDMMSG")) > 0)
send_proc(errConn, scratch, var);
} else if (var < totalburst) {
//
// Not all messages sent indicates the send buffer is full
//
var = sprintf(scratch, "[%d]SENDMMSG INCOMPLETE: Only %d out of %d sent\n", connindex, var, totalburst);
send_proc(errConn, scratch, var);
}
}
}
#endif // HAVE_SENDMMSG
//
// Send a burst of messages using the slower but more widely available sendmsg syscall
//
static void _sendmsg_burst(int connindex, int totalburst, int burstsize, unsigned int payload, unsigned int addon) {
register struct connection *c = &conn[connindex];
struct msghdr msg;
struct iovec iov;
unsigned int uvar, rttrd = 0;
int i;
struct loadHdr *lHdr;
struct timespec tspecvar;
//
// Calculate RTT response delay
//
if (tspecisset(&c->pduRxTime)) {
tspecminus(&repo.systemClock, &c->pduRxTime, &tspecvar);
rttrd = (unsigned int) tspecmsec(&tspecvar);
}
//
// Prepare send structures
//
memset((void *) &msg, 0, sizeof(struct msghdr));
if (c->randPayload) {
lHdr = (struct loadHdr *) repo.sndBufRand;
} else {
lHdr = (struct loadHdr *) repo.sndBuffer;
}
_populate_header(lHdr, c, rttrd);
for (i = 0; i < totalburst; i++) {
int var;
lHdr->lpduSeqNo = htonl((uint32_t) ++c->lpduSeqNo);
if (i < burstsize)
uvar = payload;
else
uvar = addon;
lHdr->udpPayload = htons((uint16_t) uvar);
if (c->randPayload) {
_randomize_payload((char *) lHdr + sizeof(struct loadHdr), uvar - sizeof(struct loadHdr));
}
//
// Setup corresponding message structure
//
iov.iov_base = (void *) lHdr;
iov.iov_len = (size_t) uvar;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
//
// Send a single message of our burst with a system call
//
// NOTE: Certain error conditions are expected when overloading an interface
//
var = sendmsg(c->fd, &msg, 0);
if (!conf.errSuppress) {
if (var < 0) {
//
// An error of EAGAIN (Resource temporarily unavailable) indicates the send buffer is full
//
if ((var = socket_error(connindex, errno, "SENDMSG")) > 0)
send_proc(errConn, scratch, var);
}
}
}
}
//
// Send load PDUs via periodic timers for transmitters 1 & 2
//
int send1_loadpdu(int connindex) {
return send_loadpdu(connindex, 1);
}
int send2_loadpdu(int connindex) {
return send_loadpdu(connindex, 2);
}
int send_loadpdu(int connindex, int transmitter) {
register struct connection *c = &conn[connindex];
int var, burstsize, totalburst, txintpri, txintalt;
unsigned int payload, addon;
BOOL randpayload;
struct timespec tspecvar, *tspecpri, *tspecalt;
struct sendingRate *sr;
//
// Select sending rate source
//
if (repo.isServer) {
sr = &repo.sendingRates[c->srIndex]; // Local table if server
} else {
sr = &c->srStruct; // Server specified values if client
}
//
// Select transmitter specifics
//
randpayload = FALSE;
if (transmitter == 1) {
payload = (unsigned int) (sr->udpPayload1 & ~SRATE_RAND_BIT);
if (sr->udpPayload1 & SRATE_RAND_BIT)
randpayload = TRUE;
burstsize = (int) sr->burstSize1;
addon = 0;
} else {
payload = (unsigned int) (sr->udpPayload2 & ~SRATE_RAND_BIT);
if (sr->udpPayload2 & SRATE_RAND_BIT)
randpayload = TRUE;
burstsize = (int) sr->burstSize2;
addon = (unsigned int) (sr->udpAddon2 & ~SRATE_RAND_BIT);
}
//
// If IPv6 reduce payload to maintain L3 packet sizes
//
if (c->ipProtocol == IPPROTO_IPV6) {
if (payload >= MIN_PAYLOAD_SIZE)
payload -= IPV6_ADDSIZE;
if (addon >= MIN_PAYLOAD_SIZE)
addon -= IPV6_ADDSIZE;
}
//
// If designated as random, use stored size as max when calculating size
//
var = MIN_PAYLOAD_SIZE;
if (c->ipProtocol == IPPROTO_IPV6) {
var -= IPV6_ADDSIZE;
}
if (payload > 0 && randpayload) {
payload = getuniform(var, payload);
}
if (addon > 0 && (sr->udpAddon2 & SRATE_RAND_BIT)) {
addon = getuniform(var, addon);
}
//
// Handle test stop in progress
//
if (c->testAction != TEST_ACT_TEST) {
if (burstsize > 1)
burstsize = 1; // Reduce load w/min burst size
if (repo.isServer) {
if (conf.verbose && c->testAction == TEST_ACT_STOP1) {
int var = sprintf(scratch, "[%d]Sending test stop\n", connindex);
send_proc(monConn, scratch, var);
}
c->testAction = TEST_ACT_STOP2; // Second phase of test stop
} else {
//
// The PDU sent in this pass will confirm the test stop back to the server,
// schedule an immediate/subsequent test end
//
tspeccpy(&c->endTime, &repo.systemClock);
}
if (repo.endTimeStatus > STATUS_WARNMAX) // Declare success, but retain warnings
repo.endTimeStatus = STATUS_SUCCESS; // ErrorStatus
}
//
// Process timers 1 & 2 as primary or alternate
//
if (transmitter == 1) {
txintpri = (int) sr->txInterval1;
txintalt = (int) sr->txInterval2;
tspecpri = &c->timer1Thresh;
tspecalt = &c->timer2Thresh;
} else {
txintpri = (int) sr->txInterval2;
txintalt = (int) sr->txInterval1;
tspecpri = &c->timer2Thresh;
tspecalt = &c->timer1Thresh;
}
//
// Reset or clear primary timer (this one)
//
if (txintpri > 0) {
tspecvar.tv_sec = 0;
tspecvar.tv_nsec = (long) ((txintpri - SEND_TIMER_ADJ) * NSECINUSEC);
tspecplus(&repo.systemClock, &tspecvar, tspecpri);
} else {
tspecclear(tspecpri);
}
//
// Set or clear alternate timer (the other one)
//
if (!tspecisset(tspecalt) && txintalt > 0) {
tspecvar.tv_sec = 0;
tspecvar.tv_nsec = (long) ((txintalt - SEND_TIMER_ADJ) * NSECINUSEC);
tspecplus(&repo.systemClock, &tspecvar, tspecalt);
} else if (tspecisset(tspecalt) && txintalt == 0) {
tspecclear(tspecalt);
}
//
// Initialize interface stats on first PDU if sysfs FD is valid
//
if (repo.intfFD >= 0 && !tspecisset(&repo.intfTime)) {
upd_intf_stats(TRUE);
}
//
// Check for burst size of zero
//
if (burstsize == 0 && addon == 0) {
return 0; // Nothing to do until next call
}
//
// If receive traffic stopped, set indicator to inform peer and generate warning (else clear indicator)
//
if (tspecisset(&c->pduRxTime)) {
tspecminus(&repo.systemClock, &c->pduRxTime, &tspecvar);
if (tspecvar.tv_sec >= WARNING_NOTRAFFIC) {
c->rxStoppedLoc = TRUE;
tspecclear(&c->pduRxTime); // Clear PDU receive time to maintain indicator until traffic resumes
if (c->warningCount < WARNING_MSG_LIMIT) {
c->warningCount++;
output_warning(connindex, WARN_LOC_STOPPED);
}
} else {
c->rxStoppedLoc = FALSE;
}
}
//
// Build complete burst of datagrams and message structures
//
totalburst = burstsize;
if (addon > 0)
totalburst++;
#if defined(HAVE_SENDMMSG)
#if defined(HAVE_GSO)
_sendmmsg_gso(connindex, totalburst, burstsize, payload, addon);
#else
_sendmmsg_burst(connindex, totalburst, burstsize, payload, addon);
#endif // HAVE_GSO
#else
_sendmsg_burst(connindex, totalburst, burstsize, payload, addon);
#endif // HAVE_SENDMMSG
return 0;
}
//----------------------------------------------------------------------------
//
// Service incoming load PDUs
//
int service_loadpdu(int connindex) {
register struct connection *c = &conn[connindex];
int i, delta, var;
BOOL bvar, firstpdu = FALSE;
unsigned int uvar, seqno, rttrd, payload;
struct loadHdr *lHdr = (struct loadHdr *) repo.rcvDataPtr;
struct timespec tspecvar, tspecdelta;
char *nulloutput = ",,,,\n";
//
// Verify PDU
//
if (repo.rcvDataSize < (int) sizeof(struct loadHdr) || ntohs(lHdr->loadId) != LOAD_ID) {
return 0; // Ignore bad PDU
}
//
// Handle test stop in progress, else extend test (reset watchdog)
//
if (c->testAction != TEST_ACT_TEST || lHdr->testAction != TEST_ACT_TEST) {
if (repo.isServer) {
//
// If client is confirming stop, end test
//
if (lHdr->testAction != TEST_ACT_TEST) {
tspeccpy(&c->endTime, &repo.systemClock);
return 0;
}
} else {
//
// On first pass, finalize testing
//
if (c->testAction == TEST_ACT_TEST) {
if (conf.verbose) {
var = sprintf(scratch, "[%d]Test stop received\n", connindex);
send_proc(monConn, scratch, var);
}
c->testAction = (int) lHdr->testAction;
}
return 0;
}
} else {
tspecvar.tv_sec = TIMEOUT_NOTRAFFIC;
tspecvar.tv_nsec = 0;
tspecplus(&repo.systemClock, &tspecvar, &c->endTime);
}
//
// Save receive time for this PDU
//
tspeccpy(&c->pduRxTime, &repo.systemClock);
//
// Generate warning if peer indicates receive traffic has stopped
//
if ((bvar = (BOOL) lHdr->rxStopped) != c->rxStoppedRem) {
c->rxStoppedRem = bvar; // Save value if changed
if (c->rxStoppedRem) { // Only warn if state indicates true
if (c->warningCount < WARNING_MSG_LIMIT) {
c->warningCount++;
output_warning(connindex, WARN_REM_STOPPED);
}
}
}
//
// Generate warning if peer indicates status message sequence errors
//
if ((var = (int) ntohs(lHdr->spduSeqErr)) != c->spduSeqErr) {
c->spduSeqErr = var; // Save value if changed
if (c->spduSeqErr > 0) { // Only warn if count indicates loss
if (c->warningCount < WARNING_MSG_LIMIT) {
c->warningCount++;
output_warning(connindex, WARN_REM_STATUS);
}
}
}
//
// Update traffic stats (use size specified in PDU, actual receive may have been truncated)
//
payload = (unsigned int) ntohs(lHdr->udpPayload);
c->sisAct.rxDatagrams++;
c->sisAct.rxBytes += (uint64_t) payload;
c->tiRxDatagrams++;
c->tiRxBytes += payload;
//
// Check sequence number for loss, also reordering/duplication (end processing if so)
//
if (c->lpduSeqNo == 0)
firstpdu = TRUE;
var = 0; // Used below for history buffer processing
seqno = (unsigned int) ntohl(lHdr->lpduSeqNo);
if (seqno >= c->lpduSeqNo + 1) {
//
// Sequence number greater than or equal to expected
//
if (seqno > c->lpduSeqNo + 1) {
uvar = seqno - c->lpduSeqNo - 1; // Calculate loss
c->seqErrLoss += uvar;
c->sisAct.seqErrLoss += (uint32_t) uvar;
}
c->lpduSeqNo = seqno; // Update for next expected
} else {
//
// Sequence number less than expected, check history buffer
//
for (i = 0; i < LPDU_HISTORY_SIZE; i++) {
if (seqno == c->lpduHistBuf[i])
break;
}
if (i < LPDU_HISTORY_SIZE) {
//
// Sequence number in history buffer, increment duplicate count
//
c->seqErrDup++;
c->sisAct.seqErrDup++;
var = 2; // Skip history buffer insertion as well as subsequent processing
} else {
//
// Sequence number NOT in history buffer, increment out-of-order count
//
c->seqErrOoo++;
c->sisAct.seqErrOoo++;
var = 1; // Skip subsequent processing
//
// Correct previous loss count that resulted from this "late" datagram
//
// NOTE: If this datagram arrives after either of these have been cleared (because they were just sent
// in a status feedback message), the previous trial or sub-interval will still show the loss.
//
if (c->seqErrLoss > 0)
c->seqErrLoss--;
if (c->sisAct.seqErrLoss > 0)
c->sisAct.seqErrLoss--;
}
}
if (var < 2) {
c->lpduHistBuf[c->lpduHistIdx] = seqno; // Save sequence number in history buffer
c->lpduHistIdx = ++c->lpduHistIdx & LPDU_HISTORY_MASK; // Update history buffer index
}
//
// Calculate one-way clock delta (used again further down)
//
tspecvar.tv_sec = (time_t) ntohl(lHdr->lpduTime_sec);
tspecvar.tv_nsec = (long) ntohl(lHdr->lpduTime_nsec);
tspecminus(&repo.systemClock, &tspecvar, &tspecdelta);
delta = (int) tspecmsec(&tspecdelta);
if (c->outputFPtr != NULL) { // Start output data with one-way values
fprintf(c->outputFPtr, "%u,%u,%ld.%06ld,%ld.%06ld,%d", seqno, payload, (long) tspecvar.tv_sec,
tspecvar.tv_nsec / NSECINUSEC, (long) repo.systemClock.tv_sec, repo.systemClock.tv_nsec / NSECINUSEC,
delta);
}
if (var > 0) {
if (c->outputFPtr != NULL) { // Finalize output data with null entries
fputs(nulloutput, c->outputFPtr);
}
return 0; // No further processing for non-increasing sequence numbers
}
//
// If an updated value is detected (because another status PDU was sent),
// calculate round-trip time from the last status PDU sent until this load PDU
//
tspecvar.tv_sec = (time_t) ntohl(lHdr->spduTime_sec);
tspecvar.tv_nsec = (long) ntohl(lHdr->spduTime_nsec);
if (tspecvar.tv_nsec != c->spduTime.tv_nsec || tspecvar.tv_sec != c->spduTime.tv_sec) {
tspecminus(&repo.systemClock, &tspecvar, &tspecdelta);
uvar = (unsigned int) tspecmsec(&tspecdelta);
//
// Adjust RTT based on delay between when status PDU was received and load PDU sent
//
if ((rttrd = (unsigned int) ntohs(lHdr->rttRespDelay)) <= uvar) {
uvar -= rttrd;
} else if (rttrd == uvar + 1) { // Allow for rounding adjustment on either end
uvar = 0;
}
if (c->outputFPtr != NULL) { // Finalize output data with RTT values
fprintf(c->outputFPtr, ",%ld.%06ld,%ld.%06ld,%u,%u\n", (long) tspecvar.tv_sec,
tspecvar.tv_nsec / NSECINUSEC, (long) repo.systemClock.tv_sec,
repo.systemClock.tv_nsec / NSECINUSEC, rttrd, uvar);
}
//
// Check for new minimum
//
if (uvar < c->rttMinimum) {
c->rttMinimum = uvar;
c->delayMinUpd = TRUE;
}
//
// Update RTT variation for trial interval and RTT variation range for sub-interval
//
c->rttSample = uvar - c->rttMinimum;
if (c->rttSample < (unsigned int) c->sisAct.rttMinimum)
c->sisAct.rttMinimum = (uint32_t) c->rttSample;
if (c->rttSample > (unsigned int) c->sisAct.rttMaximum)
c->sisAct.rttMaximum = (uint32_t) c->rttSample;
tspeccpy(&c->spduTime, &tspecvar); // Save to detect updated value
} else {
if (c->outputFPtr != NULL) { // Finalize output data with null entries
fputs(nulloutput, c->outputFPtr);
}
}
//
// Process one-way clock delta (calculated above) and delay variation for this load PDU
//
if (firstpdu) {
c->clockDeltaMin = delta;
c->delayMinUpd = TRUE;
} else {
//
// Check for new minimum
//
if (delta < c->clockDeltaMin) {
c->clockDeltaMin = delta;
c->delayMinUpd = TRUE;
}
uvar = (unsigned int) (delta - c->clockDeltaMin);
//
// Update one-way delay variation stats for trial interval
//
if (uvar < c->delayVarMin)
c->delayVarMin = uvar;
if (uvar > c->delayVarMax)
c->delayVarMax = uvar;
c->delayVarSum += uvar;
c->delayVarCnt++;
//
// Update one-way delay variation stats for sub-interval
//
if (uvar < (unsigned int) c->sisAct.delayVarMin)
c->sisAct.delayVarMin = (uint32_t) uvar;
if (uvar > (unsigned int) c->sisAct.delayVarMax)
c->sisAct.delayVarMax = (uint32_t) uvar;
c->sisAct.delayVarSum += (uint32_t) uvar;
c->sisAct.delayVarCnt++;
}
return 0;
}
//----------------------------------------------------------------------------
//
// Send status PDUs via periodic timer
//
int send_statuspdu(int connindex) {
register struct connection *c = &conn[connindex];
int var;
struct timespec tspecvar;
struct sendingRate *sr;
struct statusHdr *sHdr = (struct statusHdr *) repo.defBuffer;
//
// Check for test stop in progress, else reset status send timer
//
if (c->testAction != TEST_ACT_TEST) {
tspecclear(&c->timer1Thresh); // Stop subsequent status messages
if (repo.isServer) {
if (conf.verbose && c->testAction == TEST_ACT_STOP1) {
var = sprintf(scratch, "[%d]Sending test stop\n", connindex);
send_proc(monConn, scratch, var);
}
c->testAction = TEST_ACT_STOP2; // Second phase of test stop
} else {
//
// The PDU sent in this pass will confirm the test stop back to the server,
// schedule an immediate/subsequent test end
//
tspeccpy(&c->endTime, &repo.systemClock);
}
if (repo.endTimeStatus > STATUS_WARNMAX) // Declare success, but retain warnings
repo.endTimeStatus = STATUS_SUCCESS; // ErrorStatus
} else {
tspecvar.tv_sec = 0;
tspecvar.tv_nsec = (long) (c->trialInt * NSECINMSEC);
tspecplus(&repo.systemClock, &tspecvar, &c->timer1Thresh);
//
// Only continue if some data has been received (initial load PDUs could still be in transit)
//
if (c->lpduSeqNo == 0) {
if (conf.verbose) {
var = sprintf(scratch, "[%d]Skipping status transmission, awaiting initial load PDUs...\n",
connindex);
send_proc(monConn, scratch, var);
}
return 0;
}
//
// If server, adjust sending rate based on our receive traffic conditions
//
if (repo.isServer) {
adjust_sending_rate(connindex);
}
}
//
// If receive traffic stopped, set indicator to inform peer and generate warning (else clear indicator)
//
if (tspecisset(&c->pduRxTime)) {
tspecminus(&repo.systemClock, &c->pduRxTime, &tspecvar);
if (tspecvar.tv_sec >= WARNING_NOTRAFFIC) {
c->rxStoppedLoc = TRUE;
tspecclear(&c->pduRxTime); // Clear PDU receive time to maintain indicator until traffic resumes
if (c->warningCount < WARNING_MSG_LIMIT) {
c->warningCount++;
output_warning(connindex, WARN_LOC_STOPPED);
}
} else {
c->rxStoppedLoc = FALSE;
}
}
//
// Initialize interface stats on first PDU if sysfs FD is valid
//
if (repo.intfFD >= 0 && !tspecisset(&repo.intfTime)) {
upd_intf_stats(TRUE);
}
//
// Build status header
//
sHdr->statusId = htons(STATUS_ID);
sHdr->testAction = (uint8_t) c->testAction;
sHdr->rxStopped = (uint8_t) c->rxStoppedLoc;
sHdr->spduSeqNo = htonl((uint32_t) ++c->spduSeqNo);
//
// Copy sending rate parameters or clear structure
//