src/trafgen.c

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * By Daniel Borkmann <daniel@netsniff-ng.org>
   4  * Copyright 2011 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,
   5  * Swiss federal institute of technology (ETH Zurich)
   6  * Subject to the GPL, version 2.
   7  *
   8  * A high-performance network traffic generator that uses the zero-copy
   9  * kernelspace TX_RING for network I/O. On comodity Gigabit hardware up
  10  * to 1,488,095 pps 64 Byte pps have been achieved with 2 trafgen instances
  11  * bound to different CPUs from the userspace and turned off pause frames,
  12  * ask Ronald from NST (Network Security Toolkit) for more details. ;-)
  13  * So, this line-rate result is the very same as pktgen from kernelspace!
  14  *
  15  *   Who can now hold the fords when the King of the Nine Riders comes? And
  16  *   other armies will come. I am too late. All is lost. I tarried on the
  17  *   way. All is lost. Even if my errand is performed, no one will ever
  18  *   know. There will be no one I can tell. It will be in vain.
  19  *
  20  *     -- The Lord of the Rings, Frodo thinking,
  21  *        Chapter 'The Stairs of Cirith Ungol'.
  22  */
  23
  24 /*
  25
  26 =head1 NAME
  27
  28 trafgen - a high-performance zero-copy network packet generator
  29
  30 =head1 SYNOPSIS
  31
  32 trafgen [-d|--dev <netdev>][-c|--conf <file>][-J|--jumbo-support]
  33         [-x|--interactive][-n|--num <uint>][-r|--rand][-t|--gap <usec>]
  34         [-S|--ring-size <size>][-k|--kernel-pull <usec>][-b|--bind-cpu <cpu>]
  35         [-B|--unbind-cpu <cpu>][-H|--prio-high][-Q|--notouch-irq][-v|--version]
  36         [-h|--help]
  37
  38 =head1 DESCRIPTION
  39
  40 A high-performance network traffic generator that uses the zero-copy TX_RING
  41 for network I/O. For instance, on comodity Gigabit hardware up to 1,488,095 pps
  42 64 Byte pps have been achieved with trafgen.
  43
  44 =head1 OPTIONS
  45
  46 =over
  47
  48 =item trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0
  49
  50 Use packet configuration trafgen.txf, eth0 as transmission device and CPU0
  51 for binding the process.
  52
  53 =back
  54
  55 =head1 OPTIONS
  56
  57 =over
  58
  59 =item -h|--help
  60
  61 Print help text and lists all options.
  62
  63 =item -v|--version
  64
  65 Print version.
  66
  67 =item -d|--dev <netdev>
  68
  69 Device for transmission i.e., eth0.
  70
  71 =item -c|--conf <conf>
  72
  73 Path to packet configuration file.
  74
  75 =item -x|--interactive
  76
  77 Start trafgen in interactive mode.
  78
  79 =item -J|--jumbo-support
  80
  81 Support for 64KB Super Jumbo Frames
  82
  83 =item -n|--num <uint>
  84
  85 Number of packets to generate before exiting.
  86 0 means forever until SIGINT.
  87
  88 =item -r|--rand
  89
  90 Randomize packet selection process instead of round-robin.
  91
  92 =item -t|--gap <uint>
  93
  94 Interpacket gap in microseconds.
  95
  96 =item -S|--ring-size <size>
  97
  98 Manually set ring size to <size>: mmap space in KB/MB/GB.
  99
 100 =item -k|--kernel-pull <uint>
 101
 102 Kernel pull from user interval in microseconds.
 103 Default value is 10 microseconds.
 104
 105 =item -b|--bind-cpu <cpu>
 106
 107 Bind to specific CPU (or CPU-range).
 108
 109 =item -B|--unbind-cpu <cpu>
 110
 111 Forbid to use specific CPU (or CPU-range).
 112
 113 =item -H|--prio-high
 114
 115 Make this high priority process.
 116
 117 =item -Q|--notouch-irq
 118
 119 Do not touch IRQ CPU affinity of NIC.
 120
 121 =back
 122
 123 =head1 EXAMPLES
 124
 125 =over
 126
 127 =item Generate traffic defined in trafgen.txf on eth0 using CPU 0
 128
 129 trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0
 130
 131 =item Generate traffic on eth0 using CPU 0, wait 100 us between packets
 132
 133 trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0 --gap 100
 134
 135 =item Generate 100,000 packet on eth0 using CPU 0
 136
 137 trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0 --num 100000
 138
 139 =back
 140
 141 =head1 AUTHOR
 142
 143 Written by Daniel Borkmann <daniel@netsniff-ng.org>
 144
 145 =head1 DOCUMENTATION
 146
 147 Documentation by Emmanuel Roullit <emmanuel@netsniff-ng.org>
 148
 149 =head1 BUGS
 150
 151 Please report bugs to <bugs@netsniff-ng.org>
 152
 153 =cut
 154
 155 */
 156
 157 #include <stdio.h>
 158 #include <string.h>
 159 #include <getopt.h>
 160 #include <ctype.h>
 161 #include <stdbool.h>
 162 #include <sys/socket.h>
 163 #include <sys/types.h>
 164 #include <sys/stat.h>
 165 #include <sys/time.h>
 166 #include <signal.h>
 167 #include <stdint.h>
 168 #include <stdlib.h>
 169 #include <fcntl.h>
 170 #include <time.h>
 171 #include <net/ethernet.h>
 172
 173 #include "xmalloc.h"
 174 #include "xstring.h"
 175 #include "die.h"
 176 #include "xsys.h"
 177 #include "xio.h"
 178 #include "trafgen_conf.h"
 179 #include "tprintf.h"
 180 #include "mtrand.h"
 181 #include "ring_tx.h"
 182
 183 struct stats {
 184         unsigned long tx_bytes;
 185         unsigned long tx_packets;
 186 };
 187
 188 struct mode {
 189 #define CPU_UNKNOWN  -1
 190 #define CPU_NOTOUCH  -2
 191         struct stats stats;
 192         char *device;
 193         int cpu;
 194         int rand;
 195         unsigned long kpull;
 196         /* 0 for automatic, > 0 for manual */
 197         unsigned int reserve_size;
 198         int jumbo_support;
 199         int verbose;
 200         unsigned long num;
 201         unsigned long gap;
 202 };
 203
 204 static int sock;
 205 static struct itimerval itimer;
 206 static unsigned long interval = TX_KERNEL_PULL_INT;
 207
 208 __export sig_atomic_t sigint = 0;
 209
 210 __export struct packet *packets = NULL;
 211 __export unsigned int packets_len = 0;
 212 __export struct packet_dynamics *packet_dyns = NULL;
 213 __export unsigned int packet_dyn_len = 0;
 214
 215 static const char *short_options = "d:c:n:t:vJhS:HQb:B:rk:xi:o:V";
 216
 217 static struct option long_options[] = {
 218         {"dev", required_argument, 0, 'd'},
 219         {"out", required_argument, 0, 'o'},
 220         {"in", required_argument, 0, 'i'},
 221         {"conf", required_argument, 0, 'c'},
 222         {"num", required_argument, 0, 'n'},
 223         {"gap", required_argument, 0, 't'},
 224         {"ring-size", required_argument, 0, 'S'},
 225         {"bind-cpu", required_argument, 0, 'b'},
 226         {"unbind-cpu", required_argument, 0, 'B'},
 227         {"kernel-pull", required_argument, 0, 'k'},
 228         {"jumbo-support", no_argument, 0, 'J'},
 229         {"interactive", no_argument, 0, 'x'},
 230         {"rand", no_argument, 0, 'r'},
 231         {"prio-high", no_argument, 0, 'H'},
 232         {"notouch-irq", no_argument, 0, 'Q'},
 233         {"verbose", no_argument, 0, 'V'},
 234         {"version", no_argument, 0, 'v'},
 235         {"help", no_argument, 0, 'h'},
 236         {0, 0, 0, 0}
 237 };
 238
 239 static void signal_handler(int number)
 240 {
 241         switch (number) {
 242         case SIGINT:
 243                 sigint = 1;
 244                 break;
 245         case SIGHUP:
 246         default:
 247                 break;
 248         }
 249 }
 250
 251 static void timer_elapsed(int number)
 252 {
 253         itimer.it_interval.tv_sec = 0;
 254         itimer.it_interval.tv_usec = interval;
 255         itimer.it_value.tv_sec = 0;
 256         itimer.it_value.tv_usec = interval;
 257
 258         pull_and_flush_tx_ring(sock);
 259         setitimer(ITIMER_REAL, &itimer, NULL);
 260 }
 261
 262 static void header(void)
 263 {
 264         printf("%s%s%s\n", colorize_start(bold), "trafgen "
 265                VERSION_STRING, colorize_end());
 266 }
 267
 268 static void help(void)
 269 {
 270         printf("\ntrafgen %s, high-perf zero-copy network packet generator\n",
 271                VERSION_STRING);
 272         printf("http://www.netsniff-ng.org\n\n");
 273         printf("Usage: trafgen [options]\n");
 274         printf("Options:\n");
 275         printf("  -o|-d|--out|--dev <netdev|pcap>   Networking Device i.e., eth0 or pcap\n");
 276         printf("  -i|-c|--in|--conf <cfg-file>      Packet configuration file\n");
 277         printf("  -x|--interactive                  Start trafgen in interactive server mode\n");
 278         printf("  -J|--jumbo-support                Support for 64KB Super Jumbo Frames\n");
 279         printf("                                    Default TX slot: 2048Byte\n");
 280         printf("  -n|--num <uint>                   Number of packets until exit\n");
 281         printf("  `--     0                         Loop until interrupt (default)\n");
 282         printf("   `-     n                         Send n packets and done\n");
 283         printf("  -r|--rand                         Randomize packet selection process\n");
 284         printf("                                    Instead of a round robin selection\n");
 285         printf("  -t|--gap <uint>                   Interpacket gap in us (approx)\n");
 286         printf("  -S|--ring-size <size>             Manually set ring size to <size>:\n");
 287         printf("                                    mmap space in KB/MB/GB, e.g. \'10MB\'\n");
 288         printf("  -k|--kernel-pull <uint>           Kernel pull from user interval in us\n");
 289         printf("                                    Default is 10us where the TX_RING\n");
 290         printf("                                    is populated with payload from uspace\n");
 291         printf("  -b|--bind-cpu <cpu>               Bind to specific CPU (or CPU-range)\n");
 292         printf("  -B|--unbind-cpu <cpu>             Forbid to use specific CPU (or CPU-range)\n");
 293         printf("  -H|--prio-high                    Make this high priority process\n");
 294         printf("  -Q|--notouch-irq                  Do not touch IRQ CPU affinity of NIC\n");
 295         printf("  -v|--version                      Show version\n");
 296         printf("  -h|--help                         Guess what?!\n");
 297         printf("\n");
 298         printf("Examples:\n");
 299         printf("  See trafgen.txf for configuration file examples.\n");
 300         printf("  trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0\n");
 301         printf("  trafgen --out eth0 --in trafgen.txf --bind-cpu 0\n");
 302         printf("  trafgen --out test.pcap --in trafgen.txf --bind-cpu 0\n");
 303         printf("  trafgen --dev eth0 --conf trafgen.txf --rand --gap 1000\n");
 304         printf("  trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0 --num 10 --rand\n");
 305         printf("  trafgen --interactive\n");
 306         printf("  trafgen --interactive --dev mgmt0    (only start server on mgmt0)\n");
 307         printf("  trafgen --interactive --conf trafgen-cli.batch\n");
 308         printf("\n");
 309         printf("Note:\n");
 310         printf("  This tool is targeted for network developers! You should\n");
 311         printf("  be aware of what you are doing and what these options above\n");
 312         printf("  mean! Only use this tool in an isolated LAN that you own!\n");
 313         printf("\n");
 314         printf("Please report bugs to <bugs@netsniff-ng.org>\n");
 315         printf("Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n");
 316         printf("Swiss federal institute of technology (ETH Zurich)\n");
 317         printf("License: GNU GPL version 2\n");
 318         printf("This is free software: you are free to change and redistribute it.\n");
 319         printf("There is NO WARRANTY, to the extent permitted by law.\n\n");
 320         die();
 321 }
 322
 323 static void version(void)
 324 {
 325         printf("\ntrafgen %s, high-perf zero-copy network packet generator\n",
 326                VERSION_STRING);
 327         printf("http://www.netsniff-ng.org\n\n");
 328         printf("Please report bugs to <bugs@netsniff-ng.org>\n");
 329         printf("Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n");
 330         printf("Swiss federal institute of technology (ETH Zurich)\n");
 331         printf("License: GNU GPL version 2\n");
 332         printf("This is free software: you are free to change and redistribute it.\n");
 333         printf("There is NO WARRANTY, to the extent permitted by law.\n\n");
 334         die();
 335 }
 336
 337 static inline void apply_counter(int i)
 338 {
 339         int j;
 340
 341         for (j = 0; j < packet_dyns[i].counter_len; ++j) {
 342                 uint8_t val;
 343                 struct counter *counter = &packet_dyns[i].counter[j];
 344
 345                 val = counter->val;
 346                 val -= counter->min;
 347
 348                 if (counter->type == TYPE_INC)
 349                         val = (val + counter->inc) %
 350                               (counter->max - counter->min + 1);
 351                 else
 352                         val = (val - counter->inc) %
 353                               (counter->min - counter->max + 1);
 354
 355                 val += counter->min;
 356                 counter->val = val;
 357
 358                 packets[i].payload[counter->off] = val;
 359         }
 360 }
 361
 362 static inline void apply_randomizer(int i)
 363 {
 364         int j;
 365
 366         for (j = 0; j < packet_dyns[i].randomizer_len; ++j) {
 367                 uint8_t val = (uint8_t) mt_rand_int32();
 368                 struct randomizer *randomizer = &packet_dyns[i].randomizer[j];
 369
 370                 randomizer->val = val;
 371                 packets[i].payload[randomizer->off] = val;
 372         }
 373 }
 374
 375 static void tx_precheck(struct mode *mode)
 376 {
 377         int i, mtu;
 378
 379         if (!mode)
 380                 panic("Panic over invalid args for TX trigger!\n");
 381         if (packets_len == 0 || packets_len != packet_dyn_len)
 382                 panic("Panic over invalid args for TX trigger!\n");
 383         if (!device_up_and_running(mode->device))
 384                 panic("Device not up and running!\n");
 385
 386         mtu = device_mtu(mode->device);
 387
 388         for (i = 0; i < packets_len; ++i) {
 389                 if (packets[i].len > mtu + 14)
 390                         panic("Device MTU < than your packet size!\n");
 391                 if (packets[i].len <= 14)
 392                         panic("Device packet size too short!\n");
 393         }
 394 }
 395
 396 static void tx_slowpath_or_die(struct mode *mode)
 397 {
 398         int ifindex, ret;
 399         unsigned int i;
 400         struct sockaddr_ll s_addr;
 401         unsigned long num = 1;
 402
 403         tx_precheck(mode);
 404
 405         sock = pf_socket();
 406
 407         ifindex = device_ifindex(mode->device);
 408
 409         if (mode->num > 0)
 410                 num = mode->num;
 411         if (mode->rand)
 412                 printf("Note: randomizes output makes trafgen slower!\n");
 413
 414         printf("MD: TX slowpath %s %luus\n\n", mode->rand ? "RND" : "RR", mode->gap);
 415         printf("Running! Hang up with ^C!\n\n");
 416
 417         fmemset(&s_addr, 0, sizeof(s_addr));
 418         s_addr.sll_family = PF_PACKET;
 419         s_addr.sll_halen = ETH_ALEN;
 420         s_addr.sll_ifindex = ifindex;
 421
 422         i = 0;
 423
 424         while (likely(sigint == 0) && likely(num > 0)) {
 425                 apply_counter(i);
 426                 apply_randomizer(i);
 427
 428                 ret = sendto(sock, packets[i].payload, packets[i].len, 0,
 429                              (struct sockaddr *) &s_addr, sizeof(s_addr));
 430                 if (ret < 0)
 431                         whine("sendto error!\n");
 432
 433                 mode->stats.tx_bytes += packets[i].len;
 434                 mode->stats.tx_packets++;
 435
 436                 if (mode->rand) {
 437                         i = mt_rand_int32() % packets_len;
 438                 } else {
 439                         i++;
 440                         atomic_cmp_swp(&i, packets_len, 0);
 441                 }
 442
 443                 if (mode->num > 0)
 444                         num--;
 445
 446                 usleep(mode->gap);
 447         }
 448
 449         close(sock);
 450
 451         fflush(stdout);
 452         printf("\n");
 453         printf("\r%12lu frames outgoing\n", mode->stats.tx_packets);
 454         printf("\r%12lu bytes outgoing\n", mode->stats.tx_bytes);
 455 }
 456
 457 static void tx_fastpath_or_die(struct mode *mode)
 458 {
 459         int irq, ifindex;
 460         unsigned int i, size, it = 0;
 461         unsigned long num = 1;
 462         uint8_t *out = NULL;
 463         struct ring tx_ring;
 464         struct frame_map *hdr;
 465
 466         tx_precheck(mode);
 467
 468         sock = pf_socket();
 469
 470         fmemset(&tx_ring, 0, sizeof(tx_ring));
 471         ifindex = device_ifindex(mode->device);
 472         size = ring_size(mode->device, mode->reserve_size);
 473
 474         set_packet_loss_discard(sock);
 475         setup_tx_ring_layout(sock, &tx_ring, size, mode->jumbo_support);
 476         create_tx_ring(sock, &tx_ring);
 477         mmap_tx_ring(sock, &tx_ring);
 478         alloc_tx_ring_frames(&tx_ring);
 479         bind_tx_ring(sock, &tx_ring, ifindex);
 480
 481         if (mode->cpu >= 0 && ifindex > 0) {
 482                 irq = device_irq_number(mode->device);
 483                 device_bind_irq_to_cpu(mode->cpu, irq);
 484                 printf("IRQ: %s:%d > CPU%d\n", mode->device, irq,
 485                        mode->cpu);
 486         }
 487
 488         if (mode->kpull)
 489                 interval = mode->kpull;
 490         if (mode->num > 0)
 491                 num = mode->num;
 492         if (mode->rand)
 493                 printf("Note: randomizes output makes trafgen slower!\n");
 494
 495         printf("MD: TX fastpath %s %luus\n\n", mode->rand ? "RND" : "RR", interval);
 496         printf("Running! Hang up with ^C!\n\n");
 497
 498         itimer.it_interval.tv_sec = 0;
 499         itimer.it_interval.tv_usec = interval;
 500         itimer.it_value.tv_sec = 0;
 501         itimer.it_value.tv_usec = interval;
 502         setitimer(ITIMER_REAL, &itimer, NULL);
 503
 504         i = 0;
 505
 506         while (likely(sigint == 0) && likely(num > 0)) {
 507                 while (user_may_pull_from_tx(tx_ring.frames[it].iov_base) &&
 508                        likely(num > 0)) {
 509                         hdr = tx_ring.frames[it].iov_base;
 510
 511                         /* Kernel assumes: data = ph.raw + po->tp_hdrlen -
 512                          *                        sizeof(struct sockaddr_ll); */
 513                         out = ((uint8_t *) hdr) + TPACKET_HDRLEN -
 514                               sizeof(struct sockaddr_ll);
 515
 516                         hdr->tp_h.tp_snaplen = packets[i].len;
 517                         hdr->tp_h.tp_len = packets[i].len;
 518
 519                         apply_counter(i);
 520                         apply_randomizer(i);
 521
 522                         fmemcpy(out, packets[i].payload, packets[i].len);
 523
 524                         mode->stats.tx_bytes += packets[i].len;
 525                         mode->stats.tx_packets++;
 526
 527                         if (mode->rand) {
 528                                 i = mt_rand_int32() % packets_len;
 529                         } else {
 530                                 i++;
 531                                 atomic_cmp_swp(&i, packets_len, 0);
 532                         }
 533
 534                         kernel_may_pull_from_tx(&hdr->tp_h);
 535                         next_slot_prewr(&it, &tx_ring);
 536
 537                         if (mode->num > 0)
 538                                 num--;
 539                         if (unlikely(sigint == 1))
 540                                 break;
 541                 }
 542         }
 543
 544         destroy_tx_ring(sock, &tx_ring);
 545         close(sock);
 546
 547         fflush(stdout);
 548         printf("\n");
 549         printf("\r%12lu frames outgoing\n", mode->stats.tx_packets);
 550         printf("\r%12lu bytes outgoing\n", mode->stats.tx_bytes);
 551 }
 552
 553 static void main_loop(struct mode *mode, char *confname)
 554 {
 555         compile_packets(confname, mode->verbose);
 556
 557         if (mode->gap > 0)
 558                 tx_slowpath_or_die(mode);
 559         else
 560                 tx_fastpath_or_die(mode);
 561
 562         cleanup_packets();
 563 }
 564
 565 int main(int argc, char **argv)
 566 {
 567         int c, opt_index, i, j, interactive = 0;
 568         char *confname = NULL, *ptr;
 569         bool prio_high = false;
 570         struct mode mode;
 571
 572         check_for_root_maybe_die();
 573
 574         fmemset(&mode, 0, sizeof(mode));
 575         mode.cpu = CPU_UNKNOWN;
 576         mode.gap = 0;
 577         mode.num = 0;
 578
 579         while ((c = getopt_long(argc, argv, short_options, long_options,
 580                &opt_index)) != EOF) {
 581                 switch (c) {
 582                 case 'h':
 583                         help();
 584                         break;
 585                 case 'v':
 586                         version();
 587                         break;
 588                 case 'V':
 589                         mode.verbose = 1;
 590                         break;
 591                 case 'd':
 592                 case 'o':
 593                         mode.device = xstrndup(optarg, IFNAMSIZ);
 594                         break;
 595                 case 'x':
 596                         interactive = 1;
 597                         break;
 598                 case 'r':
 599                         mode.rand = 1;
 600                         break;
 601                 case 'J':
 602                         mode.jumbo_support = 1;
 603                         break;
 604                 case 'c':
 605                 case 'i':
 606                         confname = xstrdup(optarg);
 607                         break;
 608                 case 'k':
 609                         mode.kpull = atol(optarg);
 610                         break;
 611                 case 'n':
 612                         mode.num = atol(optarg);
 613                         break;
 614                 case 't':
 615                         mode.gap = atol(optarg);
 616                         break;
 617                 case 'S':
 618                         ptr = optarg;
 619                         mode.reserve_size = 0;
 620
 621                         for (j = i = strlen(optarg); i > 0; --i) {
 622                                 if (!isdigit(optarg[j - i]))
 623                                         break;
 624                                 ptr++;
 625                         }
 626
 627                         if (!strncmp(ptr, "KB", strlen("KB")))
 628                                 mode.reserve_size = 1 << 10;
 629                         else if (!strncmp(ptr, "MB", strlen("MB")))
 630                                 mode.reserve_size = 1 << 20;
 631                         else if (!strncmp(ptr, "GB", strlen("GB")))
 632                                 mode.reserve_size = 1 << 30;
 633                         else
 634                                 panic("Syntax error in ring size param!\n");
 635                         *ptr = 0;
 636
 637                         mode.reserve_size *= atoi(optarg);
 638                         break;
 639                 case 'b':
 640                         set_cpu_affinity(optarg, 0);
 641                         /* Take the first CPU for rebinding the IRQ */
 642                         if (mode.cpu != CPU_NOTOUCH)
 643                                 mode.cpu = atoi(optarg);
 644                         break;
 645                 case 'B':
 646                         set_cpu_affinity(optarg, 1);
 647                         break;
 648                 case 'H':
 649                         prio_high = true;
 650                         break;
 651                 case 'Q':
 652                         mode.cpu = CPU_NOTOUCH;
 653                         break;
 654                 case '?':
 655                         switch (optopt) {
 656                         case 'd':
 657                         case 'c':
 658                         case 'n':
 659                         case 'S':
 660                         case 'b':
 661                         case 'o':
 662                         case 'i':
 663                         case 'k':
 664                         case 'B':
 665                         case 't':
 666                                 panic("Option -%c requires an argument!\n",
 667                                       optopt);
 668                         default:
 669                                 if (isprint(optopt))
 670                                         whine("Unknown option character "
 671                                               "`0x%X\'!\n", optopt);
 672                                 die();
 673                         }
 674                 default:
 675                         break;
 676                 }
 677         }
 678
 679         if (!interactive && argc < 5)
 680                 help();
 681         if (interactive && argc < 2)
 682                 help();
 683         if (!interactive && mode.device == NULL)
 684                 panic("No networking device given!\n");
 685         if (!interactive && confname == NULL)
 686                 panic("No configuration file given!\n");
 687         if (!interactive && device_mtu(mode.device) == 0)
 688                 panic("This is no networking device!\n");
 689         if (!interactive && device_up_and_running(mode.device) == 0)
 690                 panic("Networking device not running!\n");
 691
 692         register_signal(SIGINT, signal_handler);
 693         register_signal(SIGHUP, signal_handler);
 694         register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO);
 695
 696         header();
 697
 698         if (prio_high == true) {
 699                 set_proc_prio(get_default_proc_prio());
 700                 set_sched_status(get_default_sched_policy(),
 701                                  get_default_sched_prio());
 702         }
 703
 704         if (interactive)
 705                 main_loop_interactive(&mode, confname);
 706         else
 707                 main_loop(&mode, confname);
 708
 709         if (mode.device)
 710                 xfree(mode.device);
 711         if (confname)
 712                 xfree(confname);
 713
 714         return 0;
 715 }