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         int rfraw;
 196         unsigned long kpull;
 197         /* 0 for automatic, > 0 for manual */
 198         unsigned int reserve_size;
 199         int jumbo_support;
 200         int verbose;
 201         unsigned long num;
 202         unsigned long gap;
 203 };
 204
 205 static int sock;
 206 static struct itimerval itimer;
 207 static unsigned long interval = TX_KERNEL_PULL_INT;
 208
 209 __export sig_atomic_t sigint = 0;
 210
 211 __export struct packet *packets = NULL;
 212 __export unsigned int packets_len = 0;
 213 __export struct packet_dynamics *packet_dyns = NULL;
 214 __export unsigned int packet_dyn_len = 0;
 215
 216 static const char *short_options = "d:c:n:t:vJhS:HQb:B:rk:xi:o:VR";
 217
 218 static struct option long_options[] = {
 219         {"dev", required_argument, 0, 'd'},
 220         {"out", required_argument, 0, 'o'},
 221         {"in", required_argument, 0, 'i'},
 222         {"conf", required_argument, 0, 'c'},
 223         {"num", required_argument, 0, 'n'},
 224         {"gap", required_argument, 0, 't'},
 225         {"ring-size", required_argument, 0, 'S'},
 226         {"bind-cpu", required_argument, 0, 'b'},
 227         {"unbind-cpu", required_argument, 0, 'B'},
 228         {"kernel-pull", required_argument, 0, 'k'},
 229         {"jumbo-support", no_argument, 0, 'J'},
 230         {"rfraw", no_argument, 0, 'R'},
 231         {"interactive", no_argument, 0, 'x'},
 232         {"rand", no_argument, 0, 'r'},
 233         {"prio-high", no_argument, 0, 'H'},
 234         {"notouch-irq", no_argument, 0, 'Q'},
 235         {"verbose", no_argument, 0, 'V'},
 236         {"version", no_argument, 0, 'v'},
 237         {"help", no_argument, 0, 'h'},
 238         {0, 0, 0, 0}
 239 };
 240
 241 static void signal_handler(int number)
 242 {
 243         switch (number) {
 244         case SIGINT:
 245                 sigint = 1;
 246                 break;
 247         case SIGHUP:
 248         default:
 249                 break;
 250         }
 251 }
 252
 253 static void timer_elapsed(int number)
 254 {
 255         itimer.it_interval.tv_sec = 0;
 256         itimer.it_interval.tv_usec = interval;
 257         itimer.it_value.tv_sec = 0;
 258         itimer.it_value.tv_usec = interval;
 259
 260         pull_and_flush_tx_ring(sock);
 261         setitimer(ITIMER_REAL, &itimer, NULL);
 262 }
 263
 264 static void header(void)
 265 {
 266         printf("%s%s%s\n", colorize_start(bold), "trafgen "
 267                VERSION_STRING, colorize_end());
 268 }
 269
 270 static void help(void)
 271 {
 272         printf("\ntrafgen %s, high-perf zero-copy network packet generator\n",
 273                VERSION_STRING);
 274         printf("http://www.netsniff-ng.org\n\n");
 275         printf("Usage: trafgen [options]\n");
 276         printf("Options:\n");
 277         printf("  -o|-d|--out|--dev <netdev|pcap>   Networking Device i.e., eth0 or pcap\n");
 278         printf("  -i|-c|--in|--conf <cfg-file>      Packet configuration file\n");
 279         printf("  -x|--interactive                  Start trafgen in interactive server mode\n");
 280         printf("  -J|--jumbo-support                Support for 64KB Super Jumbo Frames\n");
 281         printf("                                    Default TX slot: 2048Byte\n");
 282         printf("  -R|--rfraw                        Inject raw 802.11 frames\n");
 283         printf("  -n|--num <uint>                   Number of packets until exit\n");
 284         printf("  `--     0                         Loop until interrupt (default)\n");
 285         printf("   `-     n                         Send n packets and done\n");
 286         printf("  -r|--rand                         Randomize packet selection process\n");
 287         printf("                                    Instead of a round robin selection\n");
 288         printf("  -t|--gap <uint>                   Interpacket gap in us (approx)\n");
 289         printf("  -S|--ring-size <size>             Manually set ring size to <size>:\n");
 290         printf("                                    mmap space in KB/MB/GB, e.g. \'10MB\'\n");
 291         printf("  -k|--kernel-pull <uint>           Kernel pull from user interval in us\n");
 292         printf("                                    Default is 10us where the TX_RING\n");
 293         printf("                                    is populated with payload from uspace\n");
 294         printf("  -b|--bind-cpu <cpu>               Bind to specific CPU (or CPU-range)\n");
 295         printf("  -B|--unbind-cpu <cpu>             Forbid to use specific CPU (or CPU-range)\n");
 296         printf("  -H|--prio-high                    Make this high priority process\n");
 297         printf("  -Q|--notouch-irq                  Do not touch IRQ CPU affinity of NIC\n");
 298         printf("  -v|--version                      Show version\n");
 299         printf("  -h|--help                         Guess what?!\n");
 300         printf("\n");
 301         printf("Examples:\n");
 302         printf("  See trafgen.txf for configuration file examples.\n");
 303         printf("  trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0\n");
 304         printf("  trafgen --dev wlan0 --rfraw --conf beacon-test.txf --bind-cpu 0\n");
 305         printf("  trafgen --out eth0 --in trafgen.txf --bind-cpu 0\n");
 306         printf("  trafgen --out test.pcap --in trafgen.txf --bind-cpu 0\n");
 307         printf("  trafgen --dev eth0 --conf trafgen.txf --rand --gap 1000\n");
 308         printf("  trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0 --num 10 --rand\n");
 309         printf("  trafgen --interactive\n");
 310         printf("  trafgen --interactive --dev mgmt0    (only start server on mgmt0)\n");
 311         printf("  trafgen --interactive --conf trafgen-cli.batch\n");
 312         printf("\n");
 313         printf("Note:\n");
 314         printf("  This tool is targeted for network developers! You should\n");
 315         printf("  be aware of what you are doing and what these options above\n");
 316         printf("  mean! Only use this tool in an isolated LAN that you own!\n");
 317         printf("\n");
 318         printf("Please report bugs to <bugs@netsniff-ng.org>\n");
 319         printf("Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n");
 320         printf("Swiss federal institute of technology (ETH Zurich)\n");
 321         printf("License: GNU GPL version 2\n");
 322         printf("This is free software: you are free to change and redistribute it.\n");
 323         printf("There is NO WARRANTY, to the extent permitted by law.\n\n");
 324         die();
 325 }
 326
 327 static void version(void)
 328 {
 329         printf("\ntrafgen %s, high-perf zero-copy network packet generator\n",
 330                VERSION_STRING);
 331         printf("http://www.netsniff-ng.org\n\n");
 332         printf("Please report bugs to <bugs@netsniff-ng.org>\n");
 333         printf("Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n");
 334         printf("Swiss federal institute of technology (ETH Zurich)\n");
 335         printf("License: GNU GPL version 2\n");
 336         printf("This is free software: you are free to change and redistribute it.\n");
 337         printf("There is NO WARRANTY, to the extent permitted by law.\n\n");
 338         die();
 339 }
 340
 341 static inline void apply_counter(int i)
 342 {
 343         int j;
 344
 345         for (j = 0; j < packet_dyns[i].counter_len; ++j) {
 346                 uint8_t val;
 347                 struct counter *counter = &packet_dyns[i].counter[j];
 348
 349                 val = counter->val;
 350                 val -= counter->min;
 351
 352                 if (counter->type == TYPE_INC)
 353                         val = (val + counter->inc) %
 354                               (counter->max - counter->min + 1);
 355                 else
 356                         val = (val - counter->inc) %
 357                               (counter->min - counter->max + 1);
 358
 359                 val += counter->min;
 360                 counter->val = val;
 361
 362                 packets[i].payload[counter->off] = val;
 363         }
 364 }
 365
 366 static inline void apply_randomizer(int i)
 367 {
 368         int j;
 369
 370         for (j = 0; j < packet_dyns[i].randomizer_len; ++j) {
 371                 uint8_t val = (uint8_t) mt_rand_int32();
 372                 struct randomizer *randomizer = &packet_dyns[i].randomizer[j];
 373
 374                 randomizer->val = val;
 375                 packets[i].payload[randomizer->off] = val;
 376         }
 377 }
 378
 379 static void tx_precheck(struct mode *mode)
 380 {
 381         int i, mtu;
 382
 383         if (!mode)
 384                 panic("Panic over invalid args for TX trigger!\n");
 385         if (packets_len == 0 || packets_len != packet_dyn_len)
 386                 panic("Panic over invalid args for TX trigger!\n");
 387         if (!device_up_and_running(mode->device))
 388                 panic("Device not up and running!\n");
 389
 390         mtu = device_mtu(mode->device);
 391
 392         for (i = 0; i < packets_len; ++i) {
 393                 if (packets[i].len > mtu + 14)
 394                         panic("Device MTU < than your packet size!\n");
 395                 if (packets[i].len <= 14)
 396                         panic("Device packet size too short!\n");
 397         }
 398 }
 399
 400 static void tx_slowpath_or_die(struct mode *mode)
 401 {
 402         int ifindex, ret;
 403         unsigned int i;
 404         struct sockaddr_ll s_addr;
 405         unsigned long num = 1;
 406
 407         tx_precheck(mode);
 408
 409         sock = pf_socket();
 410
 411         ifindex = device_ifindex(mode->device);
 412
 413         if (mode->num > 0)
 414                 num = mode->num;
 415         if (mode->rand)
 416                 printf("Note: randomizes output makes trafgen slower!\n");
 417
 418         printf("MD: TX slowpath %s %luus %s\n\n", mode->rand ? "RND" : "RR",
 419                mode->gap, mode->rfraw ? "802.11raw" : "");
 420         printf("Running! Hang up with ^C!\n\n");
 421
 422         fmemset(&s_addr, 0, sizeof(s_addr));
 423         s_addr.sll_family = PF_PACKET;
 424         s_addr.sll_halen = ETH_ALEN;
 425         s_addr.sll_ifindex = ifindex;
 426
 427         i = 0;
 428
 429         while (likely(sigint == 0) && likely(num > 0)) {
 430                 apply_counter(i);
 431                 apply_randomizer(i);
 432
 433                 ret = sendto(sock, packets[i].payload, packets[i].len, 0,
 434                              (struct sockaddr *) &s_addr, sizeof(s_addr));
 435                 if (ret < 0)
 436                         whine("sendto error!\n");
 437
 438                 mode->stats.tx_bytes += packets[i].len;
 439                 mode->stats.tx_packets++;
 440
 441                 if (mode->rand) {
 442                         i = mt_rand_int32() % packets_len;
 443                 } else {
 444                         i++;
 445                         atomic_cmp_swp(&i, packets_len, 0);
 446                 }
 447
 448                 if (mode->num > 0)
 449                         num--;
 450
 451                 usleep(mode->gap);
 452         }
 453
 454         close(sock);
 455
 456         fflush(stdout);
 457         printf("\n");
 458         printf("\r%12lu frames outgoing\n", mode->stats.tx_packets);
 459         printf("\r%12lu bytes outgoing\n", mode->stats.tx_bytes);
 460 }
 461
 462 static void tx_fastpath_or_die(struct mode *mode)
 463 {
 464         int irq, ifindex;
 465         unsigned int i, size, it = 0;
 466         unsigned long num = 1;
 467         uint8_t *out = NULL;
 468         struct ring tx_ring;
 469         struct frame_map *hdr;
 470
 471         tx_precheck(mode);
 472
 473         sock = pf_socket();
 474
 475         fmemset(&tx_ring, 0, sizeof(tx_ring));
 476         ifindex = device_ifindex(mode->device);
 477         size = ring_size(mode->device, mode->reserve_size);
 478
 479         set_packet_loss_discard(sock);
 480         setup_tx_ring_layout(sock, &tx_ring, size, mode->jumbo_support);
 481         create_tx_ring(sock, &tx_ring);
 482         mmap_tx_ring(sock, &tx_ring);
 483         alloc_tx_ring_frames(&tx_ring);
 484         bind_tx_ring(sock, &tx_ring, ifindex);
 485
 486         if (mode->cpu >= 0 && ifindex > 0) {
 487                 irq = device_irq_number(mode->device);
 488                 device_bind_irq_to_cpu(mode->cpu, irq);
 489                 printf("IRQ: %s:%d > CPU%d\n", mode->device, irq,
 490                        mode->cpu);
 491         }
 492
 493         if (mode->kpull)
 494                 interval = mode->kpull;
 495         if (mode->num > 0)
 496                 num = mode->num;
 497         if (mode->rand)
 498                 printf("Note: randomizes output makes trafgen slower!\n");
 499
 500         printf("MD: TX fastpath %s %luus %s\n\n", mode->rand ? "RND" : "RR",
 501                interval, mode->rfraw ? "802.11raw" : "");
 502         printf("Running! Hang up with ^C!\n\n");
 503
 504         itimer.it_interval.tv_sec = 0;
 505         itimer.it_interval.tv_usec = interval;
 506         itimer.it_value.tv_sec = 0;
 507         itimer.it_value.tv_usec = interval;
 508         setitimer(ITIMER_REAL, &itimer, NULL);
 509
 510         i = 0;
 511
 512         while (likely(sigint == 0) && likely(num > 0)) {
 513                 while (user_may_pull_from_tx(tx_ring.frames[it].iov_base) &&
 514                        likely(num > 0)) {
 515                         hdr = tx_ring.frames[it].iov_base;
 516
 517                         /* Kernel assumes: data = ph.raw + po->tp_hdrlen -
 518                          *                        sizeof(struct sockaddr_ll); */
 519                         out = ((uint8_t *) hdr) + TPACKET_HDRLEN -
 520                               sizeof(struct sockaddr_ll);
 521
 522                         hdr->tp_h.tp_snaplen = packets[i].len;
 523                         hdr->tp_h.tp_len = packets[i].len;
 524
 525                         apply_counter(i);
 526                         apply_randomizer(i);
 527
 528                         fmemcpy(out, packets[i].payload, packets[i].len);
 529
 530                         mode->stats.tx_bytes += packets[i].len;
 531                         mode->stats.tx_packets++;
 532
 533                         if (mode->rand) {
 534                                 i = mt_rand_int32() % packets_len;
 535                         } else {
 536                                 i++;
 537                                 atomic_cmp_swp(&i, packets_len, 0);
 538                         }
 539
 540                         kernel_may_pull_from_tx(&hdr->tp_h);
 541                         next_slot_prewr(&it, &tx_ring);
 542
 543                         if (mode->num > 0)
 544                                 num--;
 545                         if (unlikely(sigint == 1))
 546                                 break;
 547                 }
 548         }
 549
 550         destroy_tx_ring(sock, &tx_ring);
 551         close(sock);
 552
 553         fflush(stdout);
 554         printf("\n");
 555         printf("\r%12lu frames outgoing\n", mode->stats.tx_packets);
 556         printf("\r%12lu bytes outgoing\n", mode->stats.tx_bytes);
 557 }
 558
 559 static void main_loop(struct mode *mode, char *confname)
 560 {
 561         compile_packets(confname, mode->verbose);
 562
 563         if (mode->gap > 0)
 564                 tx_slowpath_or_die(mode);
 565         else
 566                 tx_fastpath_or_die(mode);
 567
 568         cleanup_packets();
 569 }
 570
 571 int main(int argc, char **argv)
 572 {
 573         int c, opt_index, i, j, interactive = 0;
 574         char *confname = NULL, *ptr;
 575         bool prio_high = false;
 576         struct mode mode;
 577
 578         check_for_root_maybe_die();
 579
 580         fmemset(&mode, 0, sizeof(mode));
 581         mode.cpu = CPU_UNKNOWN;
 582         mode.gap = 0;
 583         mode.num = 0;
 584
 585         while ((c = getopt_long(argc, argv, short_options, long_options,
 586                &opt_index)) != EOF) {
 587                 switch (c) {
 588                 case 'h':
 589                         help();
 590                         break;
 591                 case 'v':
 592                         version();
 593                         break;
 594                 case 'V':
 595                         mode.verbose = 1;
 596                         break;
 597                 case 'd':
 598                 case 'o':
 599                         mode.device = xstrndup(optarg, IFNAMSIZ);
 600                         break;
 601                 case 'x':
 602                         interactive = 1;
 603                         break;
 604                 case 'r':
 605                         mode.rand = 1;
 606                         break;
 607                 case 'R':
 608                         mode.rfraw = 1;
 609                         break;
 610                 case 'J':
 611                         mode.jumbo_support = 1;
 612                         break;
 613                 case 'c':
 614                 case 'i':
 615                         confname = xstrdup(optarg);
 616                         break;
 617                 case 'k':
 618                         mode.kpull = atol(optarg);
 619                         break;
 620                 case 'n':
 621                         mode.num = atol(optarg);
 622                         break;
 623                 case 't':
 624                         mode.gap = atol(optarg);
 625                         break;
 626                 case 'S':
 627                         ptr = optarg;
 628                         mode.reserve_size = 0;
 629
 630                         for (j = i = strlen(optarg); i > 0; --i) {
 631                                 if (!isdigit(optarg[j - i]))
 632                                         break;
 633                                 ptr++;
 634                         }
 635
 636                         if (!strncmp(ptr, "KB", strlen("KB")))
 637                                 mode.reserve_size = 1 << 10;
 638                         else if (!strncmp(ptr, "MB", strlen("MB")))
 639                                 mode.reserve_size = 1 << 20;
 640                         else if (!strncmp(ptr, "GB", strlen("GB")))
 641                                 mode.reserve_size = 1 << 30;
 642                         else
 643                                 panic("Syntax error in ring size param!\n");
 644                         *ptr = 0;
 645
 646                         mode.reserve_size *= atoi(optarg);
 647                         break;
 648                 case 'b':
 649                         set_cpu_affinity(optarg, 0);
 650                         /* Take the first CPU for rebinding the IRQ */
 651                         if (mode.cpu != CPU_NOTOUCH)
 652                                 mode.cpu = atoi(optarg);
 653                         break;
 654                 case 'B':
 655                         set_cpu_affinity(optarg, 1);
 656                         break;
 657                 case 'H':
 658                         prio_high = true;
 659                         break;
 660                 case 'Q':
 661                         mode.cpu = CPU_NOTOUCH;
 662                         break;
 663                 case '?':
 664                         switch (optopt) {
 665                         case 'd':
 666                         case 'c':
 667                         case 'n':
 668                         case 'S':
 669                         case 'b':
 670                         case 'o':
 671                         case 'i':
 672                         case 'k':
 673                         case 'B':
 674                         case 't':
 675                                 panic("Option -%c requires an argument!\n",
 676                                       optopt);
 677                         default:
 678                                 if (isprint(optopt))
 679                                         whine("Unknown option character "
 680                                               "`0x%X\'!\n", optopt);
 681                                 die();
 682                         }
 683                 default:
 684                         break;
 685                 }
 686         }
 687
 688         if (!interactive && argc < 5)
 689                 help();
 690         if (interactive && argc < 2)
 691                 help();
 692         if (!interactive && mode.device == NULL)
 693                 panic("No networking device given!\n");
 694         if (!interactive && confname == NULL)
 695                 panic("No configuration file given!\n");
 696         if (!interactive && device_mtu(mode.device) == 0)
 697                 panic("This is no networking device!\n");
 698         if (!interactive && device_up_and_running(mode.device) == 0)
 699                 panic("Networking device not running!\n");
 700
 701         register_signal(SIGINT, signal_handler);
 702         register_signal(SIGHUP, signal_handler);
 703         register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO);
 704
 705         header();
 706
 707         if (prio_high == true) {
 708                 set_proc_prio(get_default_proc_prio());
 709                 set_sched_status(get_default_sched_policy(),
 710                                  get_default_sched_prio());
 711         }
 712
 713         if (interactive)
 714                 main_loop_interactive(&mode, confname);
 715         else
 716                 main_loop(&mode, confname);
 717
 718         if (mode.device)
 719                 xfree(mode.device);
 720         if (confname)
 721                 xfree(confname);
 722
 723         return 0;
 724 }