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netsniff-ng: remove unnecessary zeroing of packet counters in init_ctx()
[netsniff-ng.git] / trafgen.c
blobb25760ff01ef232c49497c591b7d29f05d695c96
1 /*
2 * netsniff-ng - the packet sniffing beast
3 * Copyright 2011 - 2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,
4 * Swiss federal institute of technology (ETH Zurich)
5 * Subject to the GPL, version 2.
6 */
7
8 #define _GNU_SOURCE
9
10 #include <stdio.h>
11 #include <string.h>
12 #include <getopt.h>
13 #include <ctype.h>
14 #include <stdbool.h>
15 #include <sched.h>
16 #include <sys/socket.h>
17 #include <sys/types.h>
18 #include <sys/fsuid.h>
19 #include <sys/prctl.h>
20 #include <sys/stat.h>
21 #include <sys/wait.h>
22 #include <sys/mman.h>
23 #include <net/ethernet.h>
24 #include <netinet/in.h>
25 #include <netinet/ip.h>
26 #include <linux/icmp.h>
27 #include <linux/if.h>
28 #include <arpa/inet.h>
29 #include <signal.h>
30 #include <stdint.h>
31 #include <stdlib.h>
32 #include <fcntl.h>
33 #include <time.h>
34 #include <poll.h>
35 #include <netdb.h>
36 #include <math.h>
37 #include <unistd.h>
38
39 #include "xmalloc.h"
40 #include "die.h"
41 #include "str.h"
42 #include "sig.h"
43 #include "sock.h"
44 #include "cpus.h"
45 #include "lockme.h"
46 #include "privs.h"
47 #include "proc.h"
48 #include "mac80211.h"
49 #include "ioops.h"
50 #include "irq.h"
51 #include "config.h"
52 #include "built_in.h"
53 #include "trafgen_conf.h"
54 #include "tprintf.h"
55 #include "timer.h"
56 #include "ring_tx.h"
57 #include "csum.h"
58 #include "trafgen_proto.h"
59 #include "pcap_io.h"
60
61 enum shaper_type {
62 SHAPER_NONE,
63 SHAPER_DELAY,
64 SHAPER_PKTS,
65 SHAPER_BYTES,
66 SHAPER_TSTAMP,
67 };
68
69 struct shaper {
70 enum shaper_type type;
71 unsigned long long sent;
72 unsigned long long rate;
73 struct timeval tstamp;
74 struct timespec delay;
75 struct timeval start;
76 struct timeval end;
77 };
78
79 struct ctx {
80 bool rand, rfraw, jumbo_support, verbose, smoke_test, enforce, qdisc_path;
81 size_t reserve_size;
82 unsigned long num;
83 unsigned int cpus;
84 uid_t uid; gid_t gid;
85 char *device, *device_trans, *rhost;
86 struct sockaddr_in dest;
87 struct shaper sh;
88 char *packet_str;
89 char *pcap_in;
90 };
91
92 struct cpu_stats {
93 unsigned long tv_sec, tv_usec;
94 unsigned long long tx_packets, tx_bytes;
95 unsigned long long cf_packets, cf_bytes;
96 unsigned long long cd_packets;
97 sig_atomic_t state;
98 };
99
100 static sig_atomic_t sigint = 0;
101
102 struct packet *packets = NULL;
103 size_t plen = 0;
104
105 struct packet_dyn *packet_dyn = NULL;
106 size_t dlen = 0;
107
108 static const char *short_options = "d:c:n:t:vJhS:rk:i:o:VRs:P:eE:pu:g:CHQqD:b:";
109 static const struct option long_options[] = {
110 {"dev", required_argument, NULL, 'd'},
111 {"out", required_argument, NULL, 'o'},
112 {"in", required_argument, NULL, 'i'},
113 {"conf", required_argument, NULL, 'c'},
114 {"num", required_argument, NULL, 'n'},
115 {"gap", required_argument, NULL, 't'},
116 {"rate", required_argument, NULL, 'b'},
117 {"cpus", required_argument, NULL, 'P'},
118 {"ring-size", required_argument, NULL, 'S'},
119 {"kernel-pull", required_argument, NULL, 'k'},
120 {"smoke-test", required_argument, NULL, 's'},
121 {"seed", required_argument, NULL, 'E'},
122 {"user", required_argument, NULL, 'u'},
123 {"group", required_argument, NULL, 'g'},
124 {"prio-high", no_argument, NULL, 'H'},
125 {"notouch-irq", no_argument, NULL, 'Q'},
126 {"no-sock-mem", no_argument, NULL, 'A'},
127 {"qdisc-path", no_argument, NULL, 'q'},
128 {"jumbo-support", no_argument, NULL, 'J'},
129 {"no-cpu-stats", no_argument, NULL, 'C'},
130 {"cpp", no_argument, NULL, 'p'},
131 {"define", required_argument, NULL, 'D'},
132 {"rfraw", no_argument, NULL, 'R'},
133 {"rand", no_argument, NULL, 'r'},
134 {"verbose", no_argument, NULL, 'V'},
135 {"version", no_argument, NULL, 'v'},
136 {"example", no_argument, NULL, 'e'},
137 {"help", no_argument, NULL, 'h'},
138 {NULL, 0, NULL, 0}
139 };
140
141 static const char *copyright = "Please report bugs to <netsniff-ng@googlegroups.com>\n"
142 "Copyright (C) 2011-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n"
143 "Swiss federal institute of technology (ETH Zurich)\n"
144 "License: GNU GPL version 2.0\n"
145 "This is free software: you are free to change and redistribute it.\n"
146 "There is NO WARRANTY, to the extent permitted by law.";
147
148 static int sock;
149 static struct cpu_stats *stats;
150 static unsigned int seed;
151
152 #define CPU_STATS_STATE_CFG 1
153 #define CPU_STATS_STATE_CHK 2
154 #define CPU_STATS_STATE_RES 4
155
156 #ifndef ICMP_FILTER
157 # define ICMP_FILTER 1
158
159 struct icmp_filter {
160 __u32 data;
161 };
162 #endif
163
164 #define SMOKE_N_PROBES 100
165
166 #define PKT_MIN_LEN 14
167
168 static void signal_handler(int number)
169 {
170 switch (number) {
171 case SIGINT:
172 case SIGQUIT:
173 case SIGTERM:
174 sigint = 1;
175 case SIGHUP:
176 default:
177 break;
178 }
179 }
180
181 static void __noreturn help(void)
182 {
183 printf("trafgen %s, multithreaded zero-copy network packet generator\n", VERSION_STRING);
184 puts("http://www.netsniff-ng.org\n\n"
185 "Usage: trafgen [options] [packet]\n"
186 "Options:\n"
187 " -i|-c|--in|--conf <cfg/-> Packet configuration file/stdin\n"
188 " -o|-d|--out|--dev <netdev> Networking device i.e., eth0\n"
189 " -p|--cpp Run packet config through C preprocessor\n"
190 " -D|--define Add macro/define for C preprocessor\n"
191 " -J|--jumbo-support Support 64KB super jumbo frames (def: 2048B)\n"
192 " -R|--rfraw Inject raw 802.11 frames\n"
193 " -s|--smoke-test <ipv4> Probe if machine survived fuzz-tested packet\n"
194 " -n|--num <uint> Number of packets until exit (def: 0)\n"
195 " -r|--rand Randomize packet selection (def: round robin)\n"
196 " -P|--cpus <uint> Specify number of forks(<= CPUs) (def: #CPUs)\n"
197 " -t|--gap <time> Set approx. interpacket gap (s/ms/us/ns, def: us)\n"
198 " -b|--rate <rate> Send traffic at specified rate (pps/B/kB/MB/GB/kbit/Mbit/Gbit/KiB/MiB/GiB)\n"
199 " -S|--ring-size <size> Manually set mmap size (KiB/MiB/GiB)\n"
200 " -E|--seed <uint> Manually set srand(3) seed\n"
201 " -u|--user <userid> Drop privileges and change to userid\n"
202 " -g|--group <groupid> Drop privileges and change to groupid\n"
203 " -H|--prio-high Make this high priority process\n"
204 " -A|--no-sock-mem Don't tune core socket memory\n"
205 " -Q|--notouch-irq Do not touch IRQ CPU affinity of NIC\n"
206 " -q|--qdisc-path Enable qdisc kernel path (default off since 3.14)\n"
207 " -V|--verbose Be more verbose\n"
208 " -C|--no-cpu-stats Do not print CPU time statistics on exit\n"
209 " -v|--version Show version and exit\n"
210 " -e|--example Show built-in packet config example\n"
211 " -h|--help Guess what?!\n\n"
212 "Examples:\n"
213 " trafgen --dev eth0 --conf trafgen.cfg\n"
214 " trafgen -e | trafgen -i - -o eth0 --cpp -n 1\n"
215 " trafgen --dev eth0 --conf fuzzing.cfg --smoke-test 10.0.0.1\n"
216 " trafgen --dev wlan0 --rfraw --conf beacon-test.txf -V --cpus 2\n"
217 " trafgen --dev eth0 --conf frag_dos.cfg --rand --gap 1000us\n"
218 " trafgen --dev eth0 --conf icmp.cfg --rand --num 1400000 -k1000\n"
219 " trafgen --dev eth0 --conf tcp_syn.cfg -u `id -u bob` -g `id -g bob`\n"
220 " trafgen --dev eth0 '{ fill(0xff, 6), 0x00, 0x02, 0xb3, rnd(3), c16(0x0800), fill(0xca, 64) }'\n\n"
221 "Arbitrary packet config examples (e.g. trafgen -e > trafgen.cfg):\n"
222 " Run packet on all CPUs: { fill(0xff, 64) csum16(0, 64) }\n"
223 " Run packet only on CPU1: cpu(1): { rnd(64), 0b11001100, 0xaa }\n"
224 " Run packet only on CPU1-2: cpu(1-2): { drnd(64),'a',csum16(1, 8),'b',42 }\n\n"
225 "Generate config files from existing pcap using netsniff-ng:\n"
226 " netsniff-ng --in dump.pcap --out dump.cfg\n\n"
227 "Note:\n"
228 " Smoke/fuzz test example: machine A, 10.0.0.2 (trafgen) is directly\n"
229 " connected to machine B (test kernel), 10.0.0.1. If ICMP reply fails\n"
230 " we assume the kernel crashed, thus we print the packet and quit.\n"
231 " In case you find a ping-of-death, please mention trafgen in your\n"
232 " commit message of the fix!\n\n"
233 " For introducing bit errors, delays with random variation and more,\n"
234 " make use of tc(8) with its different disciplines, i.e. netem.\n\n"
235 " For generating different package distributions, you can use scripting\n"
236 " to generate a trafgen config file with packet ratios as:\n\n"
237 " IMIX 64:7, 570:4, 1518:1\n"
238 " Tolly 64:55, 78:5, 576:17, 1518:23\n"
239 " Cisco 64:7, 594:4, 1518:1\n"
240 " RPR Trimodal 64:60, 512:20, 1518:20\n"
241 " RPR Quadrimodal 64:50, 512:15, 1518:15, 9218:20\n");
242 puts(copyright);
243 die();
244 }
245
246 static void __noreturn example(void)
247 {
248 const char *e =
249 "/* Note: dynamic elements make trafgen slower! */\n"
250 "#include <stddef.h>\n\n"
251 "{\n"
252 " /* MAC Destination */\n"
253 " fill(0xff, ETH_ALEN),\n"
254 " /* MAC Source */\n"
255 " 0x00, 0x02, 0xb3, drnd(3),\n"
256 " /* IPv4 Protocol */\n"
257 " c16(ETH_P_IP),\n"
258 " /* IPv4 Version, IHL, TOS */\n"
259 " 0b01000101, 0,\n"
260 " /* IPv4 Total Len */\n"
261 " c16(59),\n"
262 " /* IPv4 Ident */\n"
263 " drnd(2),\n"
264 " /* IPv4 Flags, Frag Off */\n"
265 " 0b01000000, 0,\n"
266 " /* IPv4 TTL */\n"
267 " 64,\n"
268 " /* Proto TCP */\n"
269 " 0x06,\n"
270 " /* IPv4 Checksum (IP header from, to) */\n"
271 " csumip(14, 33),\n"
272 " /* Source IP */\n"
273 " drnd(4),\n"
274 " /* Dest IP */\n"
275 " drnd(4),\n"
276 " /* TCP Source Port */\n"
277 " drnd(2),\n"
278 " /* TCP Dest Port */\n"
279 " c16(80),\n"
280 " /* TCP Sequence Number */\n"
281 " drnd(4),\n"
282 " /* TCP Ackn. Number */\n"
283 " c32(0),\n"
284 " /* TCP Header length + TCP SYN/ECN Flag */\n"
285 " c16((8 << 12) | TCP_FLAG_SYN | TCP_FLAG_ECE)\n"
286 " /* Window Size */\n"
287 " c16(16),\n"
288 " /* TCP Checksum (offset IP, offset TCP) */\n"
289 " csumtcp(14, 34),\n"
290 " /* TCP Options */\n"
291 " 0x00, 0x00, 0x01, 0x01, 0x08, 0x0a, 0x06,\n"
292 " 0x91, 0x68, 0x7d, 0x06, 0x91, 0x68, 0x6f,\n"
293 " /* Data blob */\n"
294 " \"gotcha!\",\n"
295 "}";
296 puts(e);
297 die();
298 }
299
300 static void __noreturn version(void)
301 {
302 printf("trafgen %s, Git id: %s\n", VERSION_LONG, GITVERSION);
303 puts("multithreaded zero-copy network packet generator\n"
304 "http://www.netsniff-ng.org\n");
305 puts(copyright);
306 die();
307 }
308
309 static void apply_counter(int id)
310 {
311 size_t j, counter_max = packet_dyn[id].clen;
312
313 for (j = 0; j < counter_max; ++j) {
314 uint8_t val;
315 struct counter *counter = &packet_dyn[id].cnt[j];
316
317 val = counter->val - counter->min;
318
319 switch (counter->type) {
320 case TYPE_INC:
321 val = (val + counter->inc) % (counter->max - counter->min + 1);
322 break;
323 case TYPE_DEC:
324 val = (val - counter->inc) % (counter->min - counter->max + 1);
325 break;
326 default:
327 bug();
328 }
329
330 counter->val = val + counter->min;
331 packets[id].payload[counter->off] = val;
332 }
333 }
334
335 static void apply_randomizer(int id)
336 {
337 size_t j, rand_max = packet_dyn[id].rlen;
338
339 for (j = 0; j < rand_max; ++j) {
340 uint8_t val = (uint8_t) rand();
341 struct randomizer *randomizer = &packet_dyn[id].rnd[j];
342
343 packets[id].payload[randomizer->off] = val;
344 }
345 }
346
347 static void apply_csum16(int id)
348 {
349 size_t j, csum_max = packet_dyn[id].slen;
350
351 for (j = 0; j < csum_max; ++j) {
352 uint16_t sum = 0;
353 struct csum16 *csum = &packet_dyn[id].csum[j];
354
355 fmemset(&packets[id].payload[csum->off], 0, sizeof(sum));
356 if (unlikely((size_t) csum->to >= packets[id].len))
357 csum->to = packets[id].len - 1;
358
359 switch (csum->which) {
360 case CSUM_IP:
361 sum = calc_csum(packets[id].payload + csum->from,
362 csum->to - csum->from + 1);
363 break;
364 case CSUM_UDP:
365 sum = p4_csum((void *) packets[id].payload + csum->from,
366 packets[id].payload + csum->to,
367 (packets[id].len - csum->to),
368 IPPROTO_UDP);
369 break;
370 case CSUM_TCP:
371 sum = p4_csum((void *) packets[id].payload + csum->from,
372 packets[id].payload + csum->to,
373 (packets[id].len - csum->to),
374 IPPROTO_TCP);
375 break;
376 case CSUM_UDP6:
377 sum = p6_csum((void *) packets[id].payload + csum->from,
378 packets[id].payload + csum->to,
379 (packets[id].len - csum->to),
380 IPPROTO_UDP);
381 break;
382 case CSUM_TCP6:
383 sum = p6_csum((void *) packets[id].payload + csum->from,
384 packets[id].payload + csum->to,
385 (packets[id].len - csum->to),
386 IPPROTO_TCP);
387 break;
388 default:
389 bug();
390 break;
391 }
392
393 fmemcpy(&packets[id].payload[csum->off], &sum, sizeof(sum));
394 }
395 }
396
397 static void preprocess_packets(void)
398 {
399 size_t i;
400
401 for (i = 0; i < plen; i++) {
402 struct packet_dyn *pktd = &packet_dyn[i];
403
404 if (packet_dyn_has_only_csums(pktd)) {
405 apply_csum16(i);
406 pktd->slen = 0;
407 xfree(pktd->csum);
408 }
409 }
410 }
411
412 static struct cpu_stats *setup_shared_var(unsigned int cpus)
413 {
414 int fd;
415 size_t len = cpus * sizeof(struct cpu_stats);
416 char *zbuff, file[256];
417 struct cpu_stats *buff;
418
419 slprintf(file, sizeof(file), ".tmp_mmap.XXXXXX");
420 fd = mkostemp_or_die(file, O_RDWR | O_CREAT | O_TRUNC);
421 zbuff = xzmalloc(len);
422 write_or_die(fd, zbuff, len);
423 xfree(zbuff);
424
425 buff = mmap(NULL, len, PROT_READ | PROT_WRITE,
426 MAP_SHARED, fd, 0);
427 if (buff == MAP_FAILED)
428 panic("Cannot setup shared variable!\n");
429
430 close(fd);
431 unlink(file);
432
433 memset(buff, 0, len);
434 return buff;
435 }
436
437 static void destroy_shared_var(void *buff, unsigned int cpus)
438 {
439 munmap(buff, cpus * sizeof(struct cpu_stats));
440 }
441
442 static void dump_trafgen_snippet(uint8_t *payload, size_t len)
443 {
444 size_t i;
445
446 printf("{");
447 for (i = 0; i < len; ++i) {
448 if (i % 15 == 0)
449 printf("\n ");
450 printf("0x%02x, ", payload[i]);
451 }
452 printf("\n}\n");
453 fflush(stdout);
454 }
455
456 static int xmit_smoke_setup(struct ctx *ctx)
457 {
458 int icmp_sock, ret, ttl = 64;
459 struct icmp_filter filter;
460
461 icmp_sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
462 if (icmp_sock < 0)
463 panic("Cannot get a ICMP socket: %s!\n", strerror(errno));
464
465 filter.data = ~(1 << ICMP_ECHOREPLY);
466
467 ret = setsockopt(icmp_sock, SOL_RAW, ICMP_FILTER, &filter, sizeof(filter));
468 if (ret < 0)
469 panic("Cannot install filter!\n");
470
471 ret = setsockopt(icmp_sock, SOL_IP, IP_TTL, &ttl, sizeof(ttl));
472 if (ret < 0)
473 panic("Cannot set TTL!\n");
474
475 memset(&ctx->dest, 0, sizeof(ctx->dest));
476 ctx->dest.sin_family = AF_INET;
477 ctx->dest.sin_port = 0;
478
479 ret = inet_aton(ctx->rhost, &ctx->dest.sin_addr);
480 if (ret < 0)
481 panic("Cannot resolve address!\n");
482
483 return icmp_sock;
484 }
485
486 static int xmit_smoke_probe(int icmp_sock, struct ctx *ctx)
487 {
488 int ret;
489 unsigned int i, j;
490 short ident, cnt = 1, idstore[SMOKE_N_PROBES];
491 uint8_t outpack[512], *data;
492 struct icmphdr *icmp;
493 struct iphdr *ip;
494 size_t len = sizeof(*icmp) + 56;
495 struct sockaddr_in from;
496 socklen_t from_len;
497 struct pollfd fds = {
498 .fd = icmp_sock,
499 .events = POLLIN,
500 };
501
502 fmemset(idstore, 0, sizeof(idstore));
503 for (j = 0; j < SMOKE_N_PROBES; j++) {
504 while ((ident = htons((short) rand())) == 0)
505 sleep(0);
506 idstore[j] = ident;
507
508 memset(outpack, 0, sizeof(outpack));
509 icmp = (void *) outpack;
510 icmp->type = ICMP_ECHO;
511 icmp->un.echo.id = ident;
512 icmp->un.echo.sequence = htons(cnt++);
513
514 data = ((uint8_t *) outpack + sizeof(*icmp));
515 for (i = 0; i < 56; ++i)
516 data[i] = (uint8_t) rand();
517
518 icmp->checksum = csum((unsigned short *) outpack,
519 len / sizeof(unsigned short));
520
521 ret = sendto(icmp_sock, outpack, len, MSG_DONTWAIT,
522 (struct sockaddr *) &ctx->dest, sizeof(ctx->dest));
523 if (unlikely(ret != (int) len))
524 panic("Cannot send out probe: %s!\n", strerror(errno));
525
526 ret = poll(&fds, 1, 50);
527 if (ret < 0)
528 panic("Poll failed!\n");
529
530 if (fds.revents & POLLIN) {
531 ret = recvfrom(icmp_sock, outpack, sizeof(outpack), 0,
532 (struct sockaddr *) &from, &from_len);
533 if (unlikely(ret <= 0))
534 panic("Probe receive failed!\n");
535 if (unlikely(from_len != sizeof(ctx->dest)))
536 continue;
537 if (unlikely(memcmp(&from, &ctx->dest, sizeof(ctx->dest))))
538 continue;
539 if (unlikely((size_t) ret < sizeof(*ip) + sizeof(*icmp)))
540 continue;
541 ip = (void *) outpack;
542 if (unlikely(ip->ihl * 4 + sizeof(*icmp) > (size_t) ret))
543 continue;
544 icmp = (void *) outpack + ip->ihl * 4;
545 for (i = 0; i < array_size(idstore); ++i) {
546 if (unlikely(icmp->un.echo.id != idstore[i]))
547 continue;
548 return 0;
549 }
550 }
551 }
552
553 return -1;
554 }
555
556 static bool shaper_is_set(struct shaper *sh)
557 {
558 return sh->type != SHAPER_NONE;
559 }
560
561 static void shaper_init(struct shaper *sh)
562 {
563 if (sh->type == SHAPER_NONE || sh->type == SHAPER_DELAY)
564 return;
565
566 memset(&sh->delay, 0, sizeof(struct timespec));
567 bug_on(gettimeofday(&sh->start, NULL));
568 sh->sent = 0;
569 }
570
571 static void shaper_set_delay(struct shaper *sh, time_t sec, long int ns)
572 {
573 if (!(sec | ns)) {
574 sh->type = SHAPER_NONE;
575 return;
576 }
577
578 sh->type = SHAPER_DELAY;
579 sh->delay.tv_sec = sec;
580 sh->delay.tv_nsec = ns;
581 }
582
583 static void shaper_set_rate(struct shaper *sh, unsigned long long rate,
584 enum shaper_type type)
585 {
586 memset(sh, 0, sizeof(struct shaper));
587 sh->rate = rate;
588 sh->type = type;
589 }
590
591 static void shaper_set_tstamp(struct shaper *sh, struct timespec *ts)
592 {
593 TIMESPEC_TO_TIMEVAL(&sh->tstamp, ts);
594 }
595
596 static void shaper_delay(struct shaper *sh, struct packet *pkt)
597 {
598 if (sh->type == SHAPER_BYTES || sh->type == SHAPER_PKTS) {
599 unsigned long pkt_len = pkt->len;
600
601 sh->sent += sh->type == SHAPER_BYTES ? pkt_len : 1;
602
603 if (sh->sent >= sh->rate && sh->rate > 0) {
604 struct timeval delay_us;
605 struct timeval time_sent;
606 struct timeval time_1s = { .tv_sec = 1 };
607
608 bug_on(gettimeofday(&sh->end, NULL));
609 timersub(&sh->end, &sh->start, &time_sent);
610
611 if (timercmp(&time_1s, &time_sent, > )) {
612 timersub(&time_1s, &time_sent, &delay_us);
613 TIMEVAL_TO_TIMESPEC(&delay_us, &sh->delay);
614 }
615 }
616 } else if (sh->type == SHAPER_TSTAMP) {
617 struct timeval tstamp;
618 struct timeval pkt_diff;
619 struct timeval diff;
620
621 bug_on(gettimeofday(&sh->end, NULL));
622 TIMESPEC_TO_TIMEVAL(&tstamp, &pkt->tstamp);
623 timersub(&sh->end, &sh->start, &diff);
624 timersub(&tstamp, &sh->tstamp, &pkt_diff);
625
626 if (timercmp(&diff, &pkt_diff, <)) {
627 struct timeval delay;
628
629 timersub(&pkt_diff, &diff, &delay);
630 TIMEVAL_TO_TIMESPEC(&delay, &sh->delay);
631 }
632
633 memcpy(&sh->tstamp, &tstamp, sizeof(sh->tstamp));
634 }
635
636 if ((sh->delay.tv_sec | sh->delay.tv_nsec) > 0) {
637 nanosleep(&sh->delay, NULL);
638
639 shaper_init(sh);
640 }
641 }
642
643 static inline void packet_apply_dyn_elements(int idx)
644 {
645 if (packet_dyn_has_elems(&packet_dyn[idx])) {
646 apply_counter(idx);
647 apply_randomizer(idx);
648 apply_csum16(idx);
649 }
650
651 if (packet_dyn_has_fields(&packet_dyn[idx])) {
652 uint32_t i;
653
654 for (i = 0; i < packet_dyn[idx].flen; i++)
655 proto_field_dyn_apply(packet_dyn[idx].fields[i]);
656
657 proto_packet_update(idx);
658 }
659 }
660
661 static void xmit_slowpath_or_die(struct ctx *ctx, unsigned int cpu, unsigned long orig_num)
662 {
663 int ret, icmp_sock = -1;
664 unsigned long num = 1, i = 0;
665 struct timeval start, end, diff;
666 unsigned long long tx_bytes = 0, tx_packets = 0;
667 struct sockaddr_ll saddr = {
668 .sll_family = PF_PACKET,
669 .sll_halen = ETH_ALEN,
670 .sll_ifindex = device_ifindex(ctx->device),
671 };
672
673 if (ctx->num > 0)
674 num = ctx->num;
675 if (ctx->num == 0 && orig_num > 0)
676 num = 0;
677
678 if (ctx->smoke_test)
679 icmp_sock = xmit_smoke_setup(ctx);
680
681 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
682
683 bug_on(gettimeofday(&start, NULL));
684
685 if (shaper_is_set(&ctx->sh))
686 shaper_init(&ctx->sh);
687
688 while (likely(sigint == 0 && num > 0 && plen > 0)) {
689 packet_apply_dyn_elements(i);
690 retry:
691 ret = sendto(sock, packets[i].payload, packets[i].len, 0,
692 (struct sockaddr *) &saddr, sizeof(saddr));
693 if (unlikely(ret < 0)) {
694 if (errno == ENOBUFS) {
695 sched_yield();
696 goto retry;
697 }
698 if (ctx->smoke_test)
699 panic("Sendto error: %s!\n", strerror(errno));
700 }
701
702 tx_bytes += packets[i].len;
703 tx_packets++;
704
705 if (ctx->smoke_test) {
706 ret = xmit_smoke_probe(icmp_sock, ctx);
707 if (unlikely(ret < 0)) {
708 printf("%sSmoke test alert:%s\n", colorize_start(bold), colorize_end());
709 printf(" Remote host seems to be unresponsive to ICMP probes!\n");
710 printf(" Last instance was packet%lu, seed:%u, trafgen snippet:\n\n",
711 i, seed);
712
713 dump_trafgen_snippet(packets[i].payload, packets[i].len);
714 break;
715 }
716 }
717
718 if (!ctx->rand) {
719 i++;
720 if (i >= plen)
721 i = 0;
722 } else
723 i = rand() % plen;
724
725 if (ctx->num > 0)
726 num--;
727
728 if (shaper_is_set(&ctx->sh))
729 shaper_delay(&ctx->sh, &packets[i]);
730 }
731
732 bug_on(gettimeofday(&end, NULL));
733 timersub(&end, &start, &diff);
734
735 if (ctx->smoke_test)
736 close(icmp_sock);
737
738 stats[cpu].tx_packets = tx_packets;
739 stats[cpu].tx_bytes = tx_bytes;
740 stats[cpu].tv_sec = diff.tv_sec;
741 stats[cpu].tv_usec = diff.tv_usec;
742
743 stats[cpu].state |= CPU_STATS_STATE_RES;
744 }
745
746 static void xmit_fastpath_or_die(struct ctx *ctx, unsigned int cpu, unsigned long orig_num)
747 {
748 int ifindex = device_ifindex(ctx->device);
749 uint8_t *out = NULL;
750 unsigned int it = 0;
751 unsigned long num = 1, i = 0;
752 size_t size = ring_size(ctx->device, ctx->reserve_size);
753 struct ring tx_ring;
754 struct frame_map *hdr;
755 struct timeval start, end, diff;
756 unsigned long long tx_bytes = 0, tx_packets = 0;
757
758 set_sock_prio(sock, 512);
759
760 ring_tx_setup(&tx_ring, sock, size, ifindex, ctx->jumbo_support, ctx->verbose);
761
762 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
763
764 if (ctx->num > 0)
765 num = ctx->num;
766 if (ctx->num == 0 && orig_num > 0)
767 num = 0;
768
769 bug_on(gettimeofday(&start, NULL));
770
771 while (likely(sigint == 0 && num > 0 && plen > 0)) {
772 if (!user_may_pull_from_tx(tx_ring.frames[it].iov_base)) {
773 int ret = pull_and_flush_tx_ring(sock);
774 if (unlikely(ret < 0)) {
775 /* We could hit EBADF if the socket has been closed before
776 * the timer was triggered.
777 */
778 if (errno != EBADF && errno != ENOBUFS)
779 panic("Flushing TX_RING failed: %s!\n", strerror(errno));
780 }
781
782 continue;
783 }
784
785 hdr = tx_ring.frames[it].iov_base;
786 out = ((uint8_t *) hdr) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
787
788 hdr->tp_h.tp_snaplen = packets[i].len;
789 hdr->tp_h.tp_len = packets[i].len;
790
791 packet_apply_dyn_elements(i);
792
793 fmemcpy(out, packets[i].payload, packets[i].len);
794
795 tx_bytes += packets[i].len;
796 tx_packets++;
797
798 if (!ctx->rand) {
799 i++;
800 if (i >= plen)
801 i = 0;
802 } else
803 i = rand() % plen;
804
805 kernel_may_pull_from_tx(&hdr->tp_h);
806
807 it++;
808 if (it >= tx_ring.layout.tp_frame_nr)
809 it = 0;
810
811 if (ctx->num > 0)
812 num--;
813 }
814
815 bug_on(gettimeofday(&end, NULL));
816 timersub(&end, &start, &diff);
817
818 pull_and_flush_tx_ring_wait(sock);
819 destroy_tx_ring(sock, &tx_ring);
820
821 stats[cpu].tx_packets = tx_packets;
822 stats[cpu].tx_bytes = tx_bytes;
823 stats[cpu].tv_sec = diff.tv_sec;
824 stats[cpu].tv_usec = diff.tv_usec;
825
826 stats[cpu].state |= CPU_STATS_STATE_RES;
827 }
828
829 static inline void __set_state(unsigned int cpu, sig_atomic_t s)
830 {
831 stats[cpu].state = s;
832 }
833
834 static inline sig_atomic_t __get_state(unsigned int cpu)
835 {
836 return stats[cpu].state;
837 }
838
839 static unsigned long __wait_and_sum_others(struct ctx *ctx, unsigned int cpu)
840 {
841 unsigned int i;
842 unsigned long total;
843
844 for (i = 0, total = plen; i < ctx->cpus; i++) {
845 if (i == cpu)
846 continue;
847
848 while ((__get_state(i) &
849 (CPU_STATS_STATE_CFG |
850 CPU_STATS_STATE_RES)) == 0 &&
851 sigint == 0)
852 sched_yield();
853
854 total += stats[i].cf_packets;
855 }
856
857 return total;
858 }
859
860 static void __correct_global_delta(struct ctx *ctx, unsigned int cpu, unsigned long orig)
861 {
862 unsigned int i;
863 unsigned long total;
864 int cpu_sel;
865 long long delta_correction = 0;
866
867 for (i = 0, total = ctx->num; i < ctx->cpus; i++) {
868 if (i == cpu)
869 continue;
870
871 while ((__get_state(i) &
872 (CPU_STATS_STATE_CHK |
873 CPU_STATS_STATE_RES)) == 0 &&
874 sigint == 0)
875 sched_yield();
876
877 total += stats[i].cd_packets;
878 }
879
880 if (total > orig)
881 delta_correction = -1 * ((long long) total - orig);
882 if (total < orig)
883 delta_correction = +1 * ((long long) orig - total);
884
885 for (cpu_sel = -1, i = 0; i < ctx->cpus; i++) {
886 if (stats[i].cd_packets > 0) {
887 if ((long long) stats[i].cd_packets +
888 delta_correction >= 0) {
889 cpu_sel = i;
890 break;
891 }
892 }
893 }
894
895 if ((int) cpu == cpu_sel)
896 ctx->num += delta_correction;
897 }
898
899 static void __set_state_cf(unsigned int cpu, unsigned long p, unsigned long b,
900 sig_atomic_t s)
901 {
902 stats[cpu].cf_packets = p;
903 stats[cpu].cf_bytes = b;
904 stats[cpu].state = s;
905 }
906
907 static void __set_state_cd(unsigned int cpu, unsigned long p, sig_atomic_t s)
908 {
909 stats[cpu].cd_packets = p;
910 stats[cpu].state = s;
911 }
912
913 static void xmit_packet_precheck(struct ctx *ctx, unsigned int cpu)
914 {
915 unsigned long plen_total, orig = ctx->num;
916 size_t total_len = 0;
917 unsigned int i;
918
919 bug_on(plen != dlen);
920
921 for (i = 0; i < plen; ++i)
922 total_len += packets[i].len;
923
924 __set_state_cf(cpu, plen, total_len, CPU_STATS_STATE_CFG);
925 plen_total = __wait_and_sum_others(ctx, cpu);
926
927 if (orig > 0) {
928 ctx->num = (unsigned long) round((1.0 * plen / plen_total) * orig);
929
930 __set_state_cd(cpu, ctx->num, CPU_STATS_STATE_CHK |
931 CPU_STATS_STATE_CFG);
932 __correct_global_delta(ctx, cpu, orig);
933 }
934
935 if (plen == 0) {
936 __set_state(cpu, CPU_STATS_STATE_RES);
937 return;
938 }
939 }
940
941 static void pcap_load_packets(const char *path)
942 {
943 const struct pcap_file_ops *pcap_io = pcap_ops[PCAP_OPS_SG];
944 uint32_t link_type, magic;
945 pcap_pkthdr_t phdr;
946 size_t buf_len;
947 uint8_t *buf;
948 int ret;
949 int fd;
950
951 fd = open(path, O_RDONLY | O_LARGEFILE | O_NOATIME);
952 if (fd < 0 && errno == EPERM)
953 fd = open_or_die(path, O_RDONLY | O_LARGEFILE);
954 if (fd < 0)
955 panic("Cannot open file %s! %s.\n", path, strerror(errno));
956
957 if (pcap_io->init_once_pcap)
958 pcap_io->init_once_pcap(false);
959
960 ret = pcap_io->pull_fhdr_pcap(fd, &magic, &link_type);
961 if (ret)
962 panic("Error reading pcap header!\n");
963
964 if (pcap_io->prepare_access_pcap) {
965 ret = pcap_io->prepare_access_pcap(fd, PCAP_MODE_RD, false);
966 if (ret)
967 panic("Error prepare reading pcap!\n");
968 }
969
970 buf_len = round_up(1024 * 1024, RUNTIME_PAGE_SIZE);
971 buf = xmalloc_aligned(buf_len, CO_CACHE_LINE_SIZE);
972
973 while (pcap_io->read_pcap(fd, &phdr, magic, buf, buf_len) > 0) {
974 struct packet *pkt;
975 size_t pkt_len;
976
977 pkt_len = pcap_get_length(&phdr, magic);
978 if (!pkt_len)
979 continue;
980
981 realloc_packet();
982
983 pkt = current_packet();
984
985 pkt->len = pkt_len;
986 pkt->payload = xzmalloc(pkt_len);
987 memcpy(pkt->payload, buf, pkt_len);
988 pcap_get_tstamp(&phdr, magic, &pkt->tstamp);
989 }
990
991 if (pcap_io->prepare_close_pcap)
992 pcap_io->prepare_close_pcap(fd, PCAP_MODE_RD);
993
994 free(buf);
995 close(fd);
996 }
997
998 static void main_loop(struct ctx *ctx, char *confname, bool slow,
999 unsigned int cpu, bool invoke_cpp, char **cpp_argv,
1000 unsigned long orig_num)
1001 {
1002 if (ctx->pcap_in) {
1003 pcap_load_packets(ctx->pcap_in);
1004 shaper_set_tstamp(&ctx->sh, &packets[0].tstamp);
1005 ctx->num = plen;
1006 } else {
1007 if (ctx->packet_str)
1008 compile_packets_str(ctx->packet_str, ctx->verbose, cpu);
1009 else
1010 compile_packets(confname, ctx->verbose, cpu, invoke_cpp, cpp_argv);
1011
1012 preprocess_packets();
1013 }
1014
1015 xmit_packet_precheck(ctx, cpu);
1016
1017 if (cpu == 0) {
1018 unsigned int i;
1019 size_t total_len = 0, total_pkts = 0;
1020
1021 for (i = 0; i < ctx->cpus; ++i) {
1022 total_len += stats[i].cf_bytes;
1023 total_pkts += stats[i].cf_packets;
1024 }
1025
1026 printf("%6zu packets to schedule\n", total_pkts);
1027 printf("%6zu bytes in total\n", total_len);
1028 printf("Running! Hang up with ^C!\n\n");
1029 fflush(stdout);
1030 }
1031
1032 sock = pf_socket();
1033
1034 if (ctx->qdisc_path == false)
1035 set_sock_qdisc_bypass(sock, ctx->verbose);
1036
1037 if (slow)
1038 xmit_slowpath_or_die(ctx, cpu, orig_num);
1039 else
1040 xmit_fastpath_or_die(ctx, cpu, orig_num);
1041
1042 close(sock);
1043
1044 cleanup_packets();
1045 }
1046
1047 static unsigned int generate_srand_seed(void)
1048 {
1049 int fd;
1050 unsigned int _seed;
1051
1052 fd = open("/dev/urandom", O_RDONLY);
1053 if (fd < 0)
1054 return time(NULL);
1055
1056 read_or_die(fd, &_seed, sizeof(_seed));
1057
1058 close(fd);
1059 return _seed;
1060 }
1061
1062 static void on_panic_del_rfmon(void *arg)
1063 {
1064 leave_rfmon_mac80211(arg);
1065 }
1066
1067 int main(int argc, char **argv)
1068 {
1069 bool slow = false, invoke_cpp = false, reseed = true, cpustats = true;
1070 bool prio_high = false, set_irq_aff = true, set_sock_mem = true;
1071 int c, vals[4] = {0}, irq;
1072 uint64_t gap = 0;
1073 unsigned int i;
1074 char *confname = NULL, *ptr;
1075 unsigned long cpus_tmp, orig_num = 0;
1076 unsigned long long tx_packets, tx_bytes;
1077 struct ctx ctx;
1078 int min_opts = 5;
1079 char **cpp_argv = NULL;
1080 size_t cpp_argc = 0;
1081 unsigned long long rate;
1082 enum shaper_type shape_type;
1083 struct timespec delay;
1084
1085 fmemset(&ctx, 0, sizeof(ctx));
1086 ctx.cpus = get_number_cpus_online();
1087 ctx.uid = getuid();
1088 ctx.gid = getgid();
1089 ctx.qdisc_path = false;
1090
1091 /* Keep an initial small default size to reduce cache-misses. */
1092 ctx.reserve_size = 512 * (1 << 10);
1093
1094 while ((c = getopt_long(argc, argv, short_options, long_options,
1095 NULL)) != EOF) {
1096 switch (c) {
1097 case 'h':
1098 help();
1099 break;
1100 case 'v':
1101 version();
1102 break;
1103 case 'C':
1104 cpustats = false;
1105 break;
1106 case 'e':
1107 example();
1108 break;
1109 case 'p':
1110 invoke_cpp = true;
1111 break;
1112 case 'D':
1113 cpp_argv = argv_insert(cpp_argv, &cpp_argc, "-D");
1114 cpp_argv = argv_insert(cpp_argv, &cpp_argc, optarg);
1115 break;
1116 case 'V':
1117 ctx.verbose = true;
1118 break;
1119 case 'P':
1120 cpus_tmp = strtoul(optarg, NULL, 0);
1121 if (cpus_tmp > 0 && cpus_tmp < ctx.cpus)
1122 ctx.cpus = cpus_tmp;
1123 break;
1124 case 'd':
1125 case 'o':
1126 ctx.device = xstrndup(optarg, IFNAMSIZ);
1127 break;
1128 case 'H':
1129 prio_high = true;
1130 break;
1131 case 'A':
1132 set_sock_mem = false;
1133 break;
1134 case 'Q':
1135 set_irq_aff = false;
1136 break;
1137 case 'q':
1138 ctx.qdisc_path = true;
1139 break;
1140 case 'r':
1141 ctx.rand = true;
1142 break;
1143 case 's':
1144 slow = true;
1145 ctx.cpus = 1;
1146 ctx.smoke_test = true;
1147 ctx.rhost = xstrdup(optarg);
1148 break;
1149 case 'R':
1150 ctx.rfraw = true;
1151 break;
1152 case 'J':
1153 ctx.jumbo_support = true;
1154 break;
1155 case 'i':
1156 confname = xstrdup(optarg);
1157 if (strstr(confname, ".pcap")) {
1158 ctx.sh.type = SHAPER_TSTAMP;
1159 ctx.pcap_in = confname;
1160 break;
1161 }
1162 case 'c':
1163 if (!strncmp("-", confname, strlen("-")))
1164 ctx.cpus = 1;
1165 break;
1166 case 'u':
1167 ctx.uid = strtoul(optarg, NULL, 0);
1168 ctx.enforce = true;
1169 break;
1170 case 'g':
1171 ctx.gid = strtoul(optarg, NULL, 0);
1172 ctx.enforce = true;
1173 break;
1174 case 'k':
1175 printf("Option -k/--kernel-pull is no longer used and "
1176 "will be removed in a future release!\n");
1177 break;
1178 case 'E':
1179 seed = strtoul(optarg, NULL, 0);
1180 reseed = false;
1181 break;
1182 case 'n':
1183 orig_num = strtoul(optarg, NULL, 0);
1184 ctx.num = orig_num;
1185 break;
1186 case 't':
1187 gap = strtoul(optarg, &ptr, 0);
1188 if (!gap && optarg == ptr)
1189 panic("Invalid gap param\n");
1190
1191 if (!strncmp(ptr, "ns", strlen("ns"))) {
1192 delay.tv_sec = gap / 1000000000;
1193 delay.tv_nsec = gap % 1000000000;
1194 } else if (*ptr == '\0' || !strncmp(ptr, "us", strlen("us"))) {
1195 /* Default to microseconds for backwards
1196 * compatibility if no postfix is given.
1197 */
1198 delay.tv_sec = gap / 1000000;
1199 delay.tv_nsec = (gap % 1000000) * 1000;
1200 } else if (!strncmp(ptr, "ms", strlen("ms"))) {
1201 delay.tv_sec = gap / 1000;
1202 delay.tv_nsec = (gap % 1000) * 1000000;
1203 } else if (!strncmp(ptr, "s", strlen("s"))) {
1204 delay.tv_sec = gap;
1205 delay.tv_nsec = 0;
1206 } else {
1207 panic("Syntax error in time param!\n");
1208 }
1209
1210 shaper_set_delay(&ctx.sh, delay.tv_sec, delay.tv_nsec);
1211 break;
1212 case 'b':
1213 rate = strtoul(optarg, &ptr, 0);
1214 if (!rate && optarg == ptr)
1215 panic("Invalid rate param\n");
1216
1217 if (strncmp(ptr, "pps", strlen("pps")) == 0) {
1218 shape_type = SHAPER_PKTS;
1219 } else if (strncmp(ptr, "B", strlen("B")) == 0) {
1220 shape_type = SHAPER_BYTES;
1221 } else if (strncmp(ptr, "kB", strlen("kB")) == 0) {
1222 shape_type = SHAPER_BYTES;
1223 rate *= 1000;
1224 } else if (strncmp(ptr, "MB", strlen("MB")) == 0) {
1225 shape_type = SHAPER_BYTES;
1226 rate *= 1000 * 1000;
1227 } else if (strncmp(ptr, "GB", strlen("GB")) == 0) {
1228 shape_type = SHAPER_BYTES;
1229 rate *= 1000 * 1000 * 1000;
1230 } else if (strncmp(ptr, "kbit", strlen("kbit")) == 0) {
1231 shape_type = SHAPER_BYTES;
1232 rate *= 1000 / 8;
1233 } else if (strncmp(ptr, "Mbit", strlen("Mbit")) == 0) {
1234 shape_type = SHAPER_BYTES;
1235 rate *= 1000 * 1000 / 8;
1236 } else if (strncmp(ptr, "Gbit", strlen("Gbit")) == 0) {
1237 shape_type = SHAPER_BYTES;
1238 rate *= 1000 * 1000 * 1000 / 8;
1239 } else if (strncmp(ptr, "KiB", strlen("KiB")) == 0) {
1240 shape_type = SHAPER_BYTES;
1241 rate *= 1 << 10;
1242 } else if (strncmp(ptr, "MiB", strlen("MiB")) == 0) {
1243 shape_type = SHAPER_BYTES;
1244 rate *= 1 << 20;
1245 } else if (strncmp(ptr, "GiB", strlen("GiB")) == 0) {
1246 shape_type = SHAPER_BYTES;
1247 rate *= 1 << 30;
1248 } else if (!rate) {
1249 shape_type = SHAPER_NONE;
1250 } else {
1251 panic("Invalid unit type for rate\n");
1252 }
1253
1254 shaper_set_rate(&ctx.sh, rate, shape_type);
1255 break;
1256 case 'S':
1257 ctx.reserve_size = strtoul(optarg, &ptr, 0);
1258 if (ctx.reserve_size == 0 && ptr == optarg)
1259 panic("Invalid ring size param\n");
1260
1261 if (!strncmp(ptr, "KiB", strlen("KiB")))
1262 ctx.reserve_size *= 1 << 10;
1263 else if (!strncmp(ptr, "MiB", strlen("MiB")))
1264 ctx.reserve_size = 1 << 20;
1265 else if (!strncmp(ptr, "GiB", strlen("GiB")))
1266 ctx.reserve_size *= 1 << 30;
1267 else
1268 panic("Invalid ring size unit type\n");
1269
1270 break;
1271 case '?':
1272 switch (optopt) {
1273 case 'd':
1274 case 'c':
1275 case 'n':
1276 case 'S':
1277 case 's':
1278 case 'P':
1279 case 'o':
1280 case 'E':
1281 case 'i':
1282 case 'k':
1283 case 'u':
1284 case 'g':
1285 case 't':
1286 panic("Option -%c requires an argument!\n",
1287 optopt);
1288 default:
1289 if (isprint(optopt))
1290 printf("Unknown option character `0x%X\'!\n", optopt);
1291 die();
1292 }
1293 default:
1294 break;
1295 }
1296 }
1297
1298 if (argc >= optind) {
1299 min_opts = 4;
1300 ctx.packet_str = argv2str(optind, argc, argv);
1301 }
1302
1303 if (argc < min_opts)
1304 help();
1305 if (ctx.device == NULL)
1306 panic("No networking device given!\n");
1307 if (confname == NULL && !ctx.packet_str)
1308 panic("No configuration file or packet string given!\n");
1309 if (device_mtu(ctx.device) == 0)
1310 panic("This is no networking device!\n");
1311
1312 register_signal(SIGINT, signal_handler);
1313 register_signal(SIGQUIT, signal_handler);
1314 register_signal(SIGTERM, signal_handler);
1315 register_signal(SIGHUP, signal_handler);
1316
1317 protos_init(ctx.device);
1318
1319 if (prio_high) {
1320 set_proc_prio(-20);
1321 set_sched_status(SCHED_FIFO, sched_get_priority_max(SCHED_FIFO));
1322 }
1323
1324 if (set_sock_mem)
1325 set_system_socket_memory(vals, array_size(vals));
1326 xlockme();
1327
1328 if (ctx.rfraw) {
1329 ctx.device_trans = xstrdup(ctx.device);
1330 xfree(ctx.device);
1331
1332 enter_rfmon_mac80211(ctx.device_trans, &ctx.device);
1333 panic_handler_add(on_panic_del_rfmon, ctx.device);
1334 sleep(0);
1335 }
1336
1337 if (shaper_is_set(&ctx.sh) || (ctx.pcap_in)) {
1338 prctl(PR_SET_TIMERSLACK, 1UL);
1339 /* Fall back to single core to not mess up correct timing.
1340 * We are slow anyway!
1341 */
1342 ctx.cpus = 1;
1343 slow = true;
1344 }
1345
1346 /*
1347 * If number of packets is smaller than number of CPUs use only as
1348 * many CPUs as there are packets. Otherwise we end up sending more
1349 * packets than intended or none at all.
1350 */
1351 if (ctx.num)
1352 ctx.cpus = min_t(unsigned int, ctx.num, ctx.cpus);
1353
1354 irq = device_irq_number(ctx.device);
1355 if (set_irq_aff)
1356 device_set_irq_affinity_list(irq, 0, ctx.cpus - 1);
1357
1358 stats = setup_shared_var(ctx.cpus);
1359
1360 for (i = 0; i < ctx.cpus; i++) {
1361 pid_t pid = fork();
1362
1363 switch (pid) {
1364 case 0:
1365 if (reseed)
1366 seed = generate_srand_seed();
1367 srand(seed);
1368
1369 cpu_affinity(i);
1370 main_loop(&ctx, confname, slow, i, invoke_cpp,
1371 cpp_argv, orig_num);
1372
1373 goto thread_out;
1374 case -1:
1375 panic("Cannot fork processes!\n");
1376 }
1377 }
1378
1379 for (i = 0; i < ctx.cpus; i++) {
1380 int status;
1381
1382 wait(&status);
1383 if (WEXITSTATUS(status) == EXIT_FAILURE)
1384 die();
1385 }
1386
1387 if (ctx.rfraw)
1388 leave_rfmon_mac80211(ctx.device);
1389
1390 if (set_sock_mem)
1391 reset_system_socket_memory(vals, array_size(vals));
1392
1393 for (i = 0, tx_packets = tx_bytes = 0; i < ctx.cpus; i++) {
1394 while ((__get_state(i) & CPU_STATS_STATE_RES) == 0)
1395 sched_yield();
1396
1397 tx_packets += stats[i].tx_packets;
1398 tx_bytes += stats[i].tx_bytes;
1399 }
1400
1401 fflush(stdout);
1402 printf("\n");
1403 printf("\r%12llu packets outgoing\n", tx_packets);
1404 printf("\r%12llu bytes outgoing\n", tx_bytes);
1405 for (i = 0; cpustats && i < ctx.cpus; i++) {
1406 printf("\r%12lu sec, %lu usec on CPU%d (%llu packets)\n",
1407 stats[i].tv_sec, stats[i].tv_usec, i,
1408 stats[i].tx_packets);
1409 }
1410
1411 thread_out:
1412 xunlockme();
1413 destroy_shared_var(stats, ctx.cpus);
1414 if (set_irq_aff)
1415 device_restore_irq_affinity_list();
1416
1417 argv_free(cpp_argv);
1418 free(ctx.device);
1419 free(ctx.device_trans);
1420 free(ctx.rhost);
1421 free(confname);
1422 free(ctx.packet_str);
1423
1424 return 0;
1425 }
netsniff-ng toolkit, the packet sniffing beast, staging tree