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send_packets.c
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send_packets.c
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/* $Id$ */
/*
* Copyright (c) 2001-2010 Aaron Turner <aturner at synfin dot net>
* Copyright (c) 2013-2018 Fred Klassen <tcpreplay at appneta dot com> - AppNeta
*
* The Tcpreplay Suite of tools 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 3 of the
* License, or with the authors permission any later version.
*
* The Tcpreplay Suite 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 the Tcpreplay Suite. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "defines.h"
#include "common.h"
#include <sys/time.h>
#include <sys/types.h>
#include <signal.h>
#include <string.h>
#include <netinet/in.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include "tcpreplay_api.h"
#include "timestamp_trace.h"
#include "../lib/sll.h"
#ifdef HAVE_NETMAP
#ifdef HAVE_SYS_POLL_H
#include <sys/poll.h>
#endif
#include <sys/ioctl.h>
#include <net/netmap.h>
#include <net/netmap_user.h>
#endif /* HAVE_NETMAP */
#ifdef TCPREPLAY
#ifdef TCPREPLAY_EDIT
#include "tcpreplay_edit_opts.h"
#include "tcpedit/tcpedit.h"
extern tcpedit_t *tcpedit;
#else
#include "tcpreplay_opts.h"
#endif /* TCPREPLAY_EDIT */
#endif /* TCPREPLAY */
#include "send_packets.h"
#include "sleep.h"
#ifdef DEBUG
extern int debug;
#endif
static void calc_sleep_time(tcpreplay_t *ctx, struct timeval *pkt_time,
struct timeval *last, COUNTER len,
sendpacket_t *sp, COUNTER counter, timestamp_t *sent_timestamp,
COUNTER start_us, COUNTER *skip_length);
static void tcpr_sleep(tcpreplay_t *ctx, sendpacket_t *sp _U_,
struct timespec *nap_this_time, struct timeval *now);
static u_char *get_next_packet(tcpreplay_t *ctx, pcap_t *pcap,
struct pcap_pkthdr *pkthdr,
int file_idx,
packet_cache_t **prev_packet);
static uint32_t get_user_count(tcpreplay_t *ctx, sendpacket_t *sp, COUNTER counter);
/**
* Fast flow packet edit
*
* Attempts to alter the packet IP addresses without
* changing CRC, which will avoid overhead of tcpreplay-edit
*
* This code is a bit bloated but it is the result of
* optimizing. Test performance on 10GigE+ networks if
* modifying.
*/
static void
fast_edit_packet_dl(struct pcap_pkthdr *pkthdr, u_char **pktdata,
uint32_t iteration, bool cached, int datalink)
{
int l2_len = 0;
ipv4_hdr_t *ip_hdr;
ipv6_hdr_t *ip6_hdr;
hdlc_hdr_t *hdlc_hdr;
sll_hdr_t *sll_hdr;
struct tcpr_pppserial_hdr *ppp;
uint32_t src_ip, dst_ip;
uint32_t src_ip_orig, dst_ip_orig;
uint16_t ether_type = 0;
if (pkthdr->caplen < (bpf_u_int32)TCPR_IPV6_H) {
dbgx(1, "Packet too short for Unique IP feature: %u", pkthdr->caplen);
return;
}
switch (datalink) {
case DLT_LINUX_SLL:
l2_len = 16;
sll_hdr = (sll_hdr_t *)*pktdata;
ether_type = sll_hdr->sll_protocol;
break;
case DLT_PPP_SERIAL:
l2_len = 4;
ppp = (struct tcpr_pppserial_hdr *)*pktdata;
if (ntohs(ppp->protocol) == 0x0021)
ether_type = htons(ETHERTYPE_IP);
else
ether_type = ppp->protocol;
break;
case DLT_C_HDLC:
l2_len = 4;
hdlc_hdr = (hdlc_hdr_t *)*pktdata;
ether_type = hdlc_hdr->protocol;
break;
case DLT_RAW:
if ((*pktdata[0] >> 4) == 4)
ether_type = ETHERTYPE_IP;
else if ((*pktdata[0] >> 4) == 6)
ether_type = ETHERTYPE_IP6;
break;
default:
warnx("Unable to process unsupported DLT type: %s (0x%x)",
pcap_datalink_val_to_description(datalink), datalink);
return;
}
switch (ether_type) {
case ETHERTYPE_IP:
ip_hdr = (ipv4_hdr_t *)(*pktdata + l2_len);
if (ip_hdr->ip_v != 4) {
dbgx(2, "expected IPv4 but got: %u", ip_hdr->ip_v);
return;
}
if (pkthdr->caplen < (bpf_u_int32)sizeof(*ip_hdr)) {
dbgx(2, "Packet too short for Unique IP feature: %u", pkthdr->caplen);
return;
}
ip_hdr = (ipv4_hdr_t *)(*pktdata + l2_len);
src_ip_orig = src_ip = ntohl(ip_hdr->ip_src.s_addr);
dst_ip_orig = dst_ip = ntohl(ip_hdr->ip_dst.s_addr);
break;
case ETHERTYPE_IP6:
if ((*pktdata[0] >> 4) != 6) {
dbgx(2, "expected IPv6 but got: %u", *pktdata[0] >> 4);
return;
}
if (pkthdr->caplen < (bpf_u_int32)TCPR_IPV6_H) {
dbgx(2, "Packet too short for Unique IPv6 feature: %u", pkthdr->caplen);
return;
}
ip6_hdr = (ipv6_hdr_t *)(*pktdata + l2_len);
src_ip_orig = src_ip = ntohl(ip6_hdr->ip_src.__u6_addr.__u6_addr32[3]);
dst_ip_orig = dst_ip = ntohl(ip6_hdr->ip_dst.__u6_addr.__u6_addr32[3]);
break;
default:
return; /* non-IP */
}
/* swap src/dst IP's in a manner that does not affect CRC */
if ((!cached && dst_ip > src_ip) ||
(cached && (dst_ip - iteration) > (src_ip - 1 - iteration))) {
if (cached) {
--src_ip;
++dst_ip;
} else {
src_ip -= iteration;
dst_ip += iteration;
}
/* CRC compensations for wrap conditions */
if (src_ip > src_ip_orig && dst_ip > dst_ip_orig) {
dbgx(1, "dst_ip > src_ip(%u): before(1) src_ip=0x%08x dst_ip=0x%08x", iteration, src_ip, dst_ip);
--src_ip;
dbgx(1, "dst_ip > src_ip(%u): after(1) src_ip=0x%08x dst_ip=0x%08x", iteration, src_ip, dst_ip);
} else if (dst_ip < dst_ip_orig && src_ip < src_ip_orig) {
dbgx(1, "dst_ip > src_ip(%u): before(2) src_ip=0x%08x dst_ip=0x%08x", iteration, src_ip, dst_ip);
++dst_ip;
dbgx(1, "dst_ip > src_ip(%u): after(2) src_ip=0x%08x dst_ip=0x%08x", iteration, src_ip, dst_ip);
}
} else {
if (cached) {
++src_ip;
--dst_ip;
} else {
src_ip += iteration;
dst_ip -= iteration;
}
/* CRC compensations for wrap conditions */
if (dst_ip > dst_ip_orig && src_ip > src_ip_orig) {
dbgx(1, "src_ip > dst_ip(%u): before(1) dst_ip=0x%08x src_ip=0x%08x", iteration, dst_ip, src_ip);
--dst_ip;
dbgx(1, "src_ip > dst_ip(%u): after(1) dst_ip=0x%08x src_ip=0x%08x", iteration, dst_ip, src_ip);
} else if (src_ip < src_ip_orig && dst_ip < dst_ip_orig) {
dbgx(1, "src_ip > dst_ip(%u): before(2) dst_ip=0x%08x src_ip=0x%08x", iteration, dst_ip, src_ip);
++src_ip;
dbgx(1, "src_ip > dst_ip(%u): after(2) dst_ip=0x%08x src_ip=0x%08x", iteration, dst_ip, src_ip);
}
}
dbgx(1, "(%u): final src_ip=0x%08x dst_ip=0x%08x", iteration, src_ip, dst_ip);
}
static inline void wake_send_queues(sendpacket_t *sp _U_,
tcpreplay_opt_t *options _U_)
{
#ifdef HAVE_NETMAP
if (options->netmap)
ioctl(sp->handle.fd, NIOCTXSYNC, NULL); /* flush TX buffer */
#endif
}
static inline void
fast_edit_packet(struct pcap_pkthdr *pkthdr, u_char **pktdata,
uint32_t iteration, bool cached, int datalink)
{
uint16_t ether_type;
ipv4_hdr_t *ip_hdr = NULL;
ipv6_hdr_t *ip6_hdr = NULL;
uint32_t src_ip, dst_ip;
uint32_t src_ip_orig, dst_ip_orig;
int l2_len;
u_char *packet = *pktdata;
if (datalink != DLT_EN10MB && datalink != DLT_JUNIPER_ETHER)
fast_edit_packet_dl(pkthdr, pktdata, iteration, cached, datalink);
if (pkthdr->caplen < (bpf_u_int32)TCPR_IPV6_H) {
dbgx(2, "Packet too short for Unique IP feature: %u", pkthdr->caplen);
return;
}
l2_len = 0;
if (datalink == DLT_JUNIPER_ETHER) {
if (memcmp(packet, "MGC", 3))
warnx("No Magic Number found: %s (0x%x)",
pcap_datalink_val_to_description(datalink), datalink);
if ((packet[3] & 0x80) == 0x80) {
l2_len = ntohs(*((uint16_t*)&packet[4]));
if (l2_len > 1024) {
warnx("L2 length too long: %u", l2_len);
return;
}
l2_len += 6;
} else
l2_len = 4; /* no header extensions */
}
/* assume Ethernet, IPv4 for now */
ether_type = ntohs(((eth_hdr_t*)(packet + l2_len))->ether_type);
l2_len += sizeof(eth_hdr_t);
while (ether_type == ETHERTYPE_VLAN) {
vlan_hdr_t *vlan_hdr = (vlan_hdr_t*)(pktdata + l2_len);
ether_type = ntohs(vlan_hdr->vlan_tpid);
l2_len += 4;
}
switch (ether_type) {
case ETHERTYPE_IP:
ip_hdr = (ipv4_hdr_t *)(packet + l2_len);
src_ip_orig = src_ip = ntohl(ip_hdr->ip_src.s_addr);
dst_ip_orig = dst_ip = ntohl(ip_hdr->ip_dst.s_addr);
break;
case ETHERTYPE_IP6:
ip6_hdr = (ipv6_hdr_t *)(packet + l2_len);
src_ip_orig = src_ip = ntohl(ip6_hdr->ip_src.__u6_addr.__u6_addr32[3]);
dst_ip_orig = dst_ip = ntohl(ip6_hdr->ip_dst.__u6_addr.__u6_addr32[3]);
break;
default:
return; /* non-IP */
}
dbgx(2, "Layer 3 protocol type is: 0x%04x", ether_type);
/* swap src/dst IP's in a manner that does not affect CRC */
if ((!cached && dst_ip > src_ip) ||
(cached && (dst_ip - iteration) > (src_ip - 1 - iteration))) {
if (cached) {
--src_ip;
++dst_ip;
} else {
src_ip -= iteration;
dst_ip += iteration;
}
/* CRC compensations for wrap conditions */
if (src_ip > src_ip_orig && dst_ip > dst_ip_orig) {
dbgx(1, "dst_ip > src_ip(%u): before(1) src_ip=0x%08x dst_ip=0x%08x", iteration, src_ip, dst_ip);
--src_ip;
dbgx(1, "dst_ip > src_ip(%u): after(1) src_ip=0x%08x dst_ip=0x%08x", iteration, src_ip, dst_ip);
} else if (dst_ip < dst_ip_orig && src_ip < src_ip_orig) {
dbgx(1, "dst_ip > src_ip(%u): before(2) src_ip=0x%08x dst_ip=0x%08x", iteration, src_ip, dst_ip);
++dst_ip;
dbgx(1, "dst_ip > src_ip(%u): after(2) src_ip=0x%08x dst_ip=0x%08x", iteration, src_ip, dst_ip);
}
} else {
if (cached) {
++src_ip;
--dst_ip;
} else {
src_ip += iteration;
dst_ip -= iteration;
}
/* CRC compensations for wrap conditions */
if (dst_ip > dst_ip_orig && src_ip > src_ip_orig) {
dbgx(1, "src_ip > dst_ip(%u): before(1) dst_ip=0x%08x src_ip=0x%08x", iteration, dst_ip, src_ip);
--dst_ip;
dbgx(1, "src_ip > dst_ip(%u): after(1) dst_ip=0x%08x src_ip=0x%08x", iteration, dst_ip, src_ip);
} else if (src_ip < src_ip_orig && dst_ip < dst_ip_orig) {
dbgx(1, "src_ip > dst_ip(%u): before(2) dst_ip=0x%08x src_ip=0x%08x", iteration, dst_ip, src_ip);
++src_ip;
dbgx(1, "src_ip > dst_ip(%u): after(2) dst_ip=0x%08x src_ip=0x%08x", iteration, dst_ip, src_ip);
}
}
dbgx(1, "(%u): final src_ip=0x%08x dst_ip=0x%08x", iteration, src_ip, dst_ip);
switch (ether_type) {
case ETHERTYPE_IP:
ip_hdr->ip_src.s_addr = htonl(src_ip);
ip_hdr->ip_dst.s_addr = htonl(dst_ip);
break;
case ETHERTYPE_IP6:
ip6_hdr->ip_src.__u6_addr.__u6_addr32[3] = htonl(src_ip);
ip6_hdr->ip_dst.__u6_addr.__u6_addr32[3] = htonl(dst_ip);
break;
}
}
/**
* \brief Update flow stats
*
* Finds out if flow is unique and updates stats.
*/
static inline void update_flow_stats(tcpreplay_t *ctx, sendpacket_t *sp,
const struct pcap_pkthdr *pkthdr, const u_char *pktdata, int datalink)
{
flow_entry_type_t res = flow_decode(ctx->flow_hash_table,
pkthdr, pktdata, datalink, ctx->options->flow_expiry);
switch (res) {
case FLOW_ENTRY_NEW:
++ctx->stats.flows;
++ctx->stats.flows_unique;
++ctx->stats.flow_packets;
if (sp) {
++sp->flows;
++sp->flows_unique;
++sp->flow_packets;
}
break;
case FLOW_ENTRY_EXISTING:
++ctx->stats.flow_packets;
if (sp)
++sp->flow_packets;
break;
case FLOW_ENTRY_EXPIRED:
++ctx->stats.flows_expired;
++ctx->stats.flows;
++ctx->stats.flow_packets;
if (sp) {
++sp->flows_expired;
++sp->flows;
++sp->flow_packets;
}
break;
case FLOW_ENTRY_NON_IP:
++ctx->stats.flow_non_flow_packets;
if (sp)
++sp->flow_non_flow_packets;
break;
case FLOW_ENTRY_INVALID:
++ctx->stats.flows_invalid_packets;
if (sp)
++sp->flows_invalid_packets;
break;
}
}
/**
* \brief Preloads the memory cache for the given pcap file_idx
*
* Preloading can be used with or without --loop
*/
void
preload_pcap_file(tcpreplay_t *ctx, int idx)
{
tcpreplay_opt_t *options = ctx->options;
char *path = options->sources[idx].filename;
pcap_t *pcap = NULL;
char ebuf[PCAP_ERRBUF_SIZE];
const u_char *pktdata = NULL;
struct pcap_pkthdr pkthdr;
packet_cache_t *cached_packet = NULL;
packet_cache_t **prev_packet = &cached_packet;
COUNTER packetnum = 0;
int dlt;
/* close stdin if reading from it (needed for some OS's) */
if (strncmp(path, "-", 1) == 0)
if (close(1) == -1)
warnx("unable to close stdin: %s", strerror(errno));
if ((pcap = pcap_open_offline(path, ebuf)) == NULL)
errx(-1, "Error opening pcap file: %s", ebuf);
dlt = pcap_datalink(pcap);
/* loop through the pcap. get_next_packet() builds the cache for us! */
while ((pktdata = get_next_packet(ctx, pcap, &pkthdr, idx, prev_packet)) != NULL) {
packetnum++;
if (options->flow_stats)
update_flow_stats(ctx, NULL, &pkthdr, pktdata, dlt);
}
/* mark this file as cached */
options->file_cache[idx].cached = TRUE;
options->file_cache[idx].dlt = dlt;
pcap_close(pcap);
}
static void increment_iteration(tcpreplay_t *ctx)
{
tcpreplay_opt_t *options = ctx->options;
ctx->last_unique_iteration = ctx->unique_iteration;
++ctx->iteration;
if (options->unique_ip) {
assert(options->unique_loops > 0.0);
ctx->unique_iteration =
(COUNTER)((float)ctx->iteration / options->unique_loops) + 1;
}
}
/**
* the main loop function for tcpreplay. This is where we figure out
* what to do with each packet
*/
void
send_packets(tcpreplay_t *ctx, pcap_t *pcap, int idx)
{
struct timeval print_delta, now, last_pkt_ts;
tcpreplay_opt_t *options = ctx->options;
tcpreplay_stats_t *stats = &ctx->stats;
COUNTER packetnum = 0;
COUNTER limit_send = options->limit_send;
struct pcap_pkthdr pkthdr;
u_char *pktdata = NULL;
sendpacket_t *sp = ctx->intf1;
COUNTER pktlen;
packet_cache_t *cached_packet = NULL;
packet_cache_t **prev_packet = NULL;
#if defined TCPREPLAY && defined TCPREPLAY_EDIT
struct pcap_pkthdr *pkthdr_ptr;
#endif
int datalink = options->file_cache[idx].dlt;
COUNTER skip_length = 0;
COUNTER end_us;
bool preload = options->file_cache[idx].cached;
bool top_speed = (options->speed.mode == speed_topspeed ||
(options->speed.mode == speed_mbpsrate && options->speed.speed == 0));
bool now_is_now = true;
gettimeofday(&now, NULL);
if (!timerisset(&stats->start_time)) {
TIMEVAL_SET(&stats->start_time, &now);
if (ctx->options->stats >= 0) {
char buf[64];
if (format_date_time(&stats->start_time, buf, sizeof(buf)) > 0)
printf("Test start: %s ...\n", buf);
}
}
ctx->skip_packets = 0;
timerclear(&last_pkt_ts);
if (options->limit_time > 0)
end_us = TIMEVAL_TO_MICROSEC(&stats->start_time) +
SEC_TO_MICROSEC(options->limit_time);
else
end_us = 0;
if (options->preload_pcap) {
prev_packet = &cached_packet;
} else {
prev_packet = NULL;
}
/* MAIN LOOP
* Keep sending while we have packets or until
* we've sent enough packets
*/
while (!ctx->abort &&
(pktdata = get_next_packet(ctx, pcap, &pkthdr, idx, prev_packet)) != NULL) {
now_is_now = false;
packetnum++;
#if defined TCPREPLAY || defined TCPREPLAY_EDIT
/* do we use the snaplen (caplen) or the "actual" packet len? */
pktlen = options->use_pkthdr_len ? (COUNTER)pkthdr.len : (COUNTER)pkthdr.caplen;
#elif TCPBRIDGE
pktlen = (COUNTER)pkthdr.caplen;
#else
#error WTF??? We should not be here!
#endif
dbgx(2, "packet " COUNTER_SPEC " caplen " COUNTER_SPEC, packetnum, pktlen);
/* Dual nic processing */
if (ctx->intf2 != NULL) {
sp = (sendpacket_t *)cache_mode(ctx, options->cachedata, packetnum);
/* sometimes we should not send the packet */
if (sp == TCPR_DIR_NOSEND)
continue;
}
#if defined TCPREPLAY && defined TCPREPLAY_EDIT
pkthdr_ptr = &pkthdr;
if (tcpedit_packet(tcpedit, &pkthdr_ptr, &pktdata, sp->cache_dir) == -1) {
errx(-1, "Error editing packet #" COUNTER_SPEC ": %s", packetnum, tcpedit_geterr(tcpedit));
}
pktlen = options->use_pkthdr_len ? (COUNTER)pkthdr_ptr->len : (COUNTER)pkthdr_ptr->caplen;
#endif
if (ctx->options->unique_ip && ctx->unique_iteration &&
ctx->unique_iteration > ctx->last_unique_iteration) {
/* edit packet to ensure every pass has unique IP addresses */
fast_edit_packet(&pkthdr, &pktdata, ctx->unique_iteration - 1,
preload, datalink);
}
/* update flow stats */
if (options->flow_stats && !preload)
update_flow_stats(ctx,
options->cache_packets ? sp : NULL, &pkthdr, pktdata, datalink);
/*
* this accelerator improves performance by avoiding expensive
* time stamps during periods where we have fallen behind in our
* sending
*/
if (skip_length && pktlen < skip_length) {
skip_length -= pktlen;
} else if (ctx->skip_packets) {
--ctx->skip_packets;
} else {
/*
* time stamping is expensive, but now is the
* time to do it.
*/
dbgx(4, "This packet time: " TIMEVAL_FORMAT, pkthdr.ts.tv_sec,
pkthdr.ts.tv_usec);
skip_length = 0;
ctx->skip_packets = 0;
if (options->speed.mode == speed_multiplier) {
if (!timerisset(&last_pkt_ts)) {
TIMEVAL_SET(&last_pkt_ts, &pkthdr.ts);
} else if (timercmp(&pkthdr.ts, &last_pkt_ts, >)) {
struct timeval delta;
timersub(&pkthdr.ts, &last_pkt_ts, &delta);
timeradd(&stats->pkt_ts_delta, &delta, &stats->pkt_ts_delta);
TIMEVAL_SET(&last_pkt_ts, &pkthdr.ts);
}
if (!timerisset(&stats->time_delta))
TIMEVAL_SET(&stats->pkt_ts_delta, &stats->pkt_ts_delta);
}
if (!top_speed) {
now_is_now = true;
gettimeofday(&now, NULL);
}
/*
* Only if the current packet is not late.
*
* This also sets skip_length and skip_packets which will avoid
* timestamping for a given number of packets.
*/
calc_sleep_time(ctx, &stats->pkt_ts_delta, &stats->time_delta,
pktlen, sp, packetnum, &stats->end_time,
TIMEVAL_TO_MICROSEC(&stats->start_time), &skip_length);
/*
* Track the time of the "last packet sent".
*
* A number of 3rd party tools generate bad timestamps which go backwards
* in time. Hence, don't update the "last" unless pkthdr.ts > last
*/
if (timercmp(&stats->time_delta, &stats->pkt_ts_delta, <))
TIMEVAL_SET(&stats->time_delta, &stats->pkt_ts_delta);
/*
* we know how long to sleep between sends, now do it.
*/
if (!top_speed)
tcpr_sleep(ctx, sp, &ctx->nap, &now);
}
#ifdef ENABLE_VERBOSE
/* do we need to print the packet via tcpdump? */
if (options->verbose)
tcpdump_print(options->tcpdump, &pkthdr, pktdata);
#endif
dbgx(2, "Sending packet #" COUNTER_SPEC, packetnum);
/* write packet out on network */
if (sendpacket(sp, pktdata, pktlen, &pkthdr) < (int)pktlen) {
warnx("Unable to send packet: %s", sendpacket_geterr(sp));
break;
}
/*
* Mark the time when we sent the last packet
*/
TIMEVAL_SET(&stats->end_time, &now);
#ifdef TIMESTAMP_TRACE
add_timestamp_trace_entry(pktlen, &stats->end_time, skip_length);
#endif
stats->pkts_sent++;
stats->bytes_sent += pktlen;
/* print stats during the run? */
if (options->stats > 0) {
if (! timerisset(&stats->last_print)) {
TIMEVAL_SET(&stats->last_print, &now);
} else {
timersub(&now, &stats->last_print, &print_delta);
if (print_delta.tv_sec >= options->stats) {
TIMEVAL_SET(&stats->end_time, &now);
packet_stats(stats);
TIMEVAL_SET(&stats->last_print, &now);
}
}
}
#if defined HAVE_NETMAP
if (sp->first_packet || timesisset(&ctx->nap)) {
wake_send_queues(sp, options);
sp->first_packet = false;
}
#endif
/* stop sending based on the duration limit... */
if ((end_us > 0 && (COUNTER)TIMEVAL_TO_MICROSEC(&now) > end_us) ||
/* ... or stop sending based on the limit -L? */
(limit_send > 0 && stats->pkts_sent >= limit_send)) {
ctx->abort = true;
}
} /* while */
#ifdef HAVE_NETMAP
/* when completing test, wait until the last packet is sent */
if (options->netmap && (ctx->abort || options->loop == 1)) {
while (ctx->intf1 && !netmap_tx_queues_empty(ctx->intf1)) {
now_is_now = true;
gettimeofday(&now, NULL);
}
while (ctx->intf2 && !netmap_tx_queues_empty(ctx->intf2)) {
now_is_now = true;
gettimeofday(&now, NULL);
}
}
#endif /* HAVE_NETMAP */
if (!now_is_now)
gettimeofday(&now, NULL);
TIMEVAL_SET(&stats->end_time, &now);
increment_iteration(ctx);
}
/**
* the alternate main loop function for tcpreplay. This is where we figure out
* what to do with each packet when processing two files a the same time
*/
void
send_dual_packets(tcpreplay_t *ctx, pcap_t *pcap1, int cache_file_idx1, pcap_t *pcap2, int cache_file_idx2)
{
struct timeval print_delta, now, last_pkt_ts;
tcpreplay_opt_t *options = ctx->options;
tcpreplay_stats_t *stats = &ctx->stats;
COUNTER packetnum = 0;
COUNTER limit_send = options->limit_send;
int cache_file_idx;
struct pcap_pkthdr pkthdr1, pkthdr2;
u_char *pktdata1 = NULL, *pktdata2 = NULL, *pktdata = NULL;
sendpacket_t *sp;
COUNTER pktlen;
packet_cache_t *cached_packet1 = NULL, *cached_packet2 = NULL;
packet_cache_t **prev_packet1 = NULL, **prev_packet2 = NULL;
struct pcap_pkthdr *pkthdr_ptr;
int datalink;
COUNTER end_us;
COUNTER skip_length = 0;
bool top_speed = (options->speed.mode == speed_topspeed ||
(options->speed.mode == speed_mbpsrate && options->speed.speed == 0));
bool now_is_now = true;
gettimeofday(&now, NULL);
if (!timerisset(&stats->start_time)) {
TIMEVAL_SET(&stats->start_time, &now);
if (ctx->options->stats >= 0) {
char buf[64];
if (format_date_time(&stats->start_time, buf, sizeof(buf)) > 0)
printf("Dual test start: %s ...\n", buf);
}
}
ctx->skip_packets = 0;
timerclear(&last_pkt_ts);
if (options->limit_time > 0)
end_us = TIMEVAL_TO_MICROSEC(&stats->start_time) +
SEC_TO_MICROSEC(options->limit_time);
else
end_us = 0;
if (options->preload_pcap) {
prev_packet1 = &cached_packet1;
prev_packet2 = &cached_packet2;
} else {
prev_packet1 = NULL;
prev_packet2 = NULL;
}
pktdata1 = get_next_packet(ctx, pcap1, &pkthdr1, cache_file_idx1, prev_packet1);
pktdata2 = get_next_packet(ctx, pcap2, &pkthdr2, cache_file_idx2, prev_packet2);
/* MAIN LOOP
* Keep sending while we have packets or until
* we've sent enough packets
*/
while (!ctx->abort &&
!(pktdata1 == NULL && pktdata2 == NULL)) {
now_is_now = false;
packetnum++;
/* figure out which pcap file we need to process next
* when get_next_packet() returns null for pktdata, the pkthdr
* will still have the old values from the previous call. This
* means we can't always trust the timestamps to tell us which
* file to process.
*/
if (pktdata1 == NULL) {
/* file 2 is next */
sp = ctx->intf2;
datalink = options->file_cache[cache_file_idx2].dlt;
pkthdr_ptr = &pkthdr2;
cache_file_idx = cache_file_idx2;
pktdata = pktdata2;
} else if (pktdata2 == NULL) {
/* file 1 is next */
sp = ctx->intf1;
datalink = options->file_cache[cache_file_idx1].dlt;
pkthdr_ptr = &pkthdr1;
cache_file_idx = cache_file_idx1;
pktdata = pktdata1;
} else if (timercmp(&pkthdr1.ts, &pkthdr2.ts, <=)) {
/* file 1 is next */
sp = ctx->intf1;
datalink = options->file_cache[cache_file_idx1].dlt;
pkthdr_ptr = &pkthdr1;
cache_file_idx = cache_file_idx1;
pktdata = pktdata1;
} else {
/* file 2 is next */
sp = ctx->intf2;
datalink = options->file_cache[cache_file_idx2].dlt;
pkthdr_ptr = &pkthdr2;
cache_file_idx = cache_file_idx2;
pktdata = pktdata2;
}
#if defined TCPREPLAY || defined TCPREPLAY_EDIT
/* do we use the snaplen (caplen) or the "actual" packet len? */
pktlen = options->use_pkthdr_len ? (COUNTER)pkthdr_ptr->len : (COUNTER)pkthdr_ptr->caplen;
#elif TCPBRIDGE
pktlen = (COUNTER)pkthdr_ptr->caplen;
#else
#error WTF??? We should not be here!
#endif
dbgx(2, "packet " COUNTER_SPEC " caplen " COUNTER_SPEC, packetnum, pktlen);
#if defined TCPREPLAY && defined TCPREPLAY_EDIT
if (tcpedit_packet(tcpedit, &pkthdr_ptr, &pktdata, sp->cache_dir) == -1) {
errx(-1, "Error editing packet #" COUNTER_SPEC ": %s", packetnum, tcpedit_geterr(tcpedit));
}
pktlen = options->use_pkthdr_len ? (COUNTER)pkthdr_ptr->len : (COUNTER)pkthdr_ptr->caplen;
#endif
if (ctx->options->unique_ip && ctx->unique_iteration &&
ctx->unique_iteration > ctx->last_unique_iteration) {
/* edit packet to ensure every pass is unique */
fast_edit_packet(pkthdr_ptr, &pktdata, ctx->unique_iteration - 1,
options->file_cache[cache_file_idx].cached, datalink);
}
/* update flow stats */
if (options->flow_stats && !options->file_cache[cache_file_idx].cached)
update_flow_stats(ctx, sp, pkthdr_ptr, pktdata, datalink);
/*
* this accelerator improves performance by avoiding expensive
* time stamps during periods where we have fallen behind in our
* sending
*/
if (skip_length && pktlen < skip_length) {
skip_length -= pktlen;
} else if (ctx->skip_packets) {
--ctx->skip_packets;
} else {
/*
* time stamping is expensive, but now is the
* time to do it.
*/
dbgx(4, "This packet time: " TIMEVAL_FORMAT, pkthdr_ptr->ts.tv_sec,
pkthdr_ptr->ts.tv_usec);
skip_length = 0;
ctx->skip_packets = 0;
if (options->speed.mode == speed_multiplier) {
if (!timerisset(&last_pkt_ts)) {
TIMEVAL_SET(&last_pkt_ts, &pkthdr_ptr->ts);
} else if (timercmp(&pkthdr_ptr->ts, &last_pkt_ts, >)) {
struct timeval delta;
timersub(&pkthdr_ptr->ts, &last_pkt_ts, &delta);
timeradd(&stats->pkt_ts_delta, &delta, &stats->pkt_ts_delta);
TIMEVAL_SET(&last_pkt_ts, &pkthdr_ptr->ts);
}
if (!timerisset(&stats->time_delta))
TIMEVAL_SET(&stats->pkt_ts_delta, &stats->pkt_ts_delta);
}
if (!top_speed) {
gettimeofday(&now, NULL);
now_is_now = true;
}
/*
* Only if the current packet is not late.
*
* This also sets skip_length and skip_packets which will avoid
* timestamping for a given number of packets.
*/
calc_sleep_time(ctx, &stats->pkt_ts_delta, &stats->time_delta,
pktlen, sp, packetnum, &stats->end_time,
TIMEVAL_TO_MICROSEC(&stats->start_time), &skip_length);
/*
* Track the time of the "last packet sent".
*
* A number of 3rd party tools generate bad timestamps which go backwards
* in time. Hence, don't update the "last" unless pkthdr.ts > last
*/
if (timercmp(&stats->time_delta, &stats->pkt_ts_delta, <))
TIMEVAL_SET(&stats->time_delta, &stats->pkt_ts_delta);
/*
* we know how long to sleep between sends, now do it.
*/
if (!top_speed)
tcpr_sleep(ctx, sp, &ctx->nap, &now);
}
#ifdef ENABLE_VERBOSE
/* do we need to print the packet via tcpdump? */
if (options->verbose)
tcpdump_print(options->tcpdump, pkthdr_ptr, pktdata);
#endif
dbgx(2, "Sending packet #" COUNTER_SPEC, packetnum);
/* write packet out on network */
if (sendpacket(sp, pktdata, pktlen, pkthdr_ptr) < (int)pktlen) {
warnx("Unable to send packet: %s", sendpacket_geterr(sp));
break;
}
/*
* Mark the time when we sent the last packet
*/
TIMEVAL_SET(&stats->end_time, &now);
stats->pkts_sent++;
stats->bytes_sent += pktlen;
/* print stats during the run? */
if (options->stats > 0) {
if (! timerisset(&stats->last_print)) {
TIMEVAL_SET(&stats->last_print, &now);
} else {
timersub(&now, &stats->last_print, &print_delta);
if (print_delta.tv_sec >= options->stats) {
TIMEVAL_SET(&stats->end_time, &now);
packet_stats(stats);
TIMEVAL_SET(&stats->last_print, &now);
}
}
}
#if defined HAVE_NETMAP
if (sp->first_packet || timesisset(&ctx->nap)) {
wake_send_queues(sp, options);
sp->first_packet = false;
}
#endif
/* get the next packet for this file handle depending on which we last used */
if (sp == ctx->intf2) {
pktdata2 = get_next_packet(ctx, pcap2, &pkthdr2, cache_file_idx2, prev_packet2);
} else {
pktdata1 = get_next_packet(ctx, pcap1, &pkthdr1, cache_file_idx1, prev_packet1);
}
/* stop sending based on the duration limit... */
if ((end_us > 0 && (COUNTER)TIMEVAL_TO_MICROSEC(&now) > end_us) ||
/* ... or stop sending based on the limit -L? */
(limit_send > 0 && stats->pkts_sent >= limit_send)) {
ctx->abort = true;
}
} /* while */
#ifdef HAVE_NETMAP
/* when completing test, wait until the last packet is sent */
if (options->netmap && (ctx->abort || options->loop == 1)) {
while (ctx->intf1 && !netmap_tx_queues_empty(ctx->intf1)) {
gettimeofday(&now, NULL);
now_is_now = true;
}
while (ctx->intf2 && !netmap_tx_queues_empty(ctx->intf2)) {
gettimeofday(&now, NULL);
now_is_now = true;
}
}
#endif /* HAVE_NETMAP */
if (!now_is_now)
gettimeofday(&now, NULL);
TIMEVAL_SET(&stats->end_time, &now);
increment_iteration(ctx);
}
/**
* Gets the next packet to be sent out. This will either read from the pcap file
* or will retrieve the packet from the internal cache.
*
* The parameter prev_packet is used as the parent of the new entry in the cache list.
* This should be NULL on the first call to this function for each file and
* will be updated as new entries are added (or retrieved) from the cache list.
*/
u_char *
get_next_packet(tcpreplay_t *ctx, pcap_t *pcap, struct pcap_pkthdr *pkthdr, int idx,
packet_cache_t **prev_packet)