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 __import int main_loop_interactive(struct mode *mode, char *confname);
 205 __import int compile_packets(char *file, int verbose);
 206
 207 static int sock;
 208 static struct itimerval itimer;
 209 static unsigned long interval = TX_KERNEL_PULL_INT;
 210
 211 __export sig_atomic_t sigint = 0;
 212
 213 __export struct packet *packets = NULL;
 214 __export unsigned int packets_len = 0;
 215 __export struct packet_dynamics *packet_dyns = NULL;
 216 __export unsigned int packet_dyn_len = 0;
 217
 218 static const char *short_options = "d:c:n:t:vJhS:HQb:B:rk:xi:o:V";
 219
 220 static struct option long_options[] = {
 221         {"dev", required_argument, 0, 'd'},
 222         {"out", required_argument, 0, 'o'},
 223         {"in", required_argument, 0, 'i'},
 224         {"conf", required_argument, 0, 'c'},
 225         {"num", required_argument, 0, 'n'},
 226         {"gap", required_argument, 0, 't'},
 227         {"ring-size", required_argument, 0, 'S'},
 228         {"bind-cpu", required_argument, 0, 'b'},
 229         {"unbind-cpu", required_argument, 0, 'B'},
 230         {"kernel-pull", required_argument, 0, 'k'},
 231         {"jumbo-support", no_argument, 0, 'J'},
 232         {"interactive", no_argument, 0, 'x'},
 233         {"rand", no_argument, 0, 'r'},
 234         {"prio-high", no_argument, 0, 'H'},
 235         {"notouch-irq", no_argument, 0, 'Q'},
 236         {"verbose", no_argument, 0, 'V'},
 237         {"version", no_argument, 0, 'v'},
 238         {"help", no_argument, 0, 'h'},
 239         {0, 0, 0, 0}
 240 };
 241
 242 static void signal_handler(int number)
 243 {
 244         switch (number) {
 245         case SIGINT:
 246                 sigint = 1;
 247                 break;
 248         case SIGHUP:
 249         default:
 250                 break;
 251         }
 252 }
 253
 254 static void timer_elapsed(int number)
 255 {
 256         itimer.it_interval.tv_sec = 0;
 257         itimer.it_interval.tv_usec = interval;
 258         itimer.it_value.tv_sec = 0;
 259         itimer.it_value.tv_usec = interval;
 260
 261         pull_and_flush_tx_ring(sock);
 262         setitimer(ITIMER_REAL, &itimer, NULL);
 263 }
 264
 265 static void header(void)
 266 {
 267         printf("%s%s%s\n", colorize_start(bold), "trafgen "
 268                VERSION_STRING, colorize_end());
 269 }
 270
 271 static void help(void)
 272 {
 273         printf("\ntrafgen %s, high-perf zero-copy network packet generator\n",
 274                VERSION_STRING);
 275         printf("http://www.netsniff-ng.org\n\n");
 276         printf("Usage: trafgen [options]\n");
 277         printf("Options:\n");
 278         printf("  -o|-d|--out|--dev <netdev|pcap>   Networking Device i.e., eth0 or pcap\n");
 279         printf("  -i|-c|--in|--conf <cfg-file>      Packet configuration file\n");
 280         printf("  -x|--interactive                  Start trafgen in interactive server mode\n");
 281         printf("  -J|--jumbo-support                Support for 64KB Super Jumbo Frames\n");
 282         printf("                                    Default TX slot: 2048Byte\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 --out eth0 --in trafgen.txf --bind-cpu 0\n");
 305         printf("  trafgen --out test.pcap --in trafgen.txf --bind-cpu 0\n");
 306         printf("  trafgen --dev eth0 --conf trafgen.txf --rand --gap 1000\n");
 307         printf("  trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0 --num 10 --rand\n");
 308         printf("  trafgen --interactive\n");
 309         printf("  trafgen --interactive --dev mgmt0    (only start server on mgmt0)\n");
 310         printf("  trafgen --interactive --conf trafgen-cli.batch\n");
 311         printf("\n");
 312         printf("Note:\n");
 313         printf("  This tool is targeted for network developers! You should\n");
 314         printf("  be aware of what you are doing and what these options above\n");
 315         printf("  mean! Only use this tool in an isolated LAN that you own!\n");
 316         printf("\n");
 317         printf("Please report bugs to <bugs@netsniff-ng.org>\n");
 318         printf("Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n");
 319         printf("Swiss federal institute of technology (ETH Zurich)\n");
 320         printf("License: GNU GPL version 2\n");
 321         printf("This is free software: you are free to change and redistribute it.\n");
 322         printf("There is NO WARRANTY, to the extent permitted by law.\n\n");
 323         die();
 324 }
 325
 326 static void version(void)
 327 {
 328         printf("\ntrafgen %s, high-perf zero-copy network packet generator\n",
 329                VERSION_STRING);
 330         printf("http://www.netsniff-ng.org\n\n");
 331         printf("Please report bugs to <bugs@netsniff-ng.org>\n");
 332         printf("Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n");
 333         printf("Swiss federal institute of technology (ETH Zurich)\n");
 334         printf("License: GNU GPL version 2\n");
 335         printf("This is free software: you are free to change and redistribute it.\n");
 336         printf("There is NO WARRANTY, to the extent permitted by law.\n\n");
 337         die();
 338 }
 339
 340 static inline void apply_counter(int i)
 341 {
 342         int j;
 343
 344         for (j = 0; j < packet_dyns[i].counter_len; ++j) {
 345                 uint8_t val;
 346                 struct counter *counter = &packet_dyns[i].counter[j];
 347
 348                 val = counter->val;
 349                 val -= counter->min;
 350
 351                 if (counter->type == TYPE_INC)
 352                         val = (val + counter->inc) %
 353                               (counter->max - counter->min + 1);
 354                 else
 355                         val = (val - counter->inc) %
 356                               (counter->min - counter->max + 1);
 357
 358                 val += counter->min;
 359                 counter->val = val;
 360
 361                 packets[i].payload[counter->off] = val;
 362         }
 363 }
 364
 365 static inline void apply_randomizer(int i)
 366 {
 367         int j;
 368
 369         for (j = 0; j < packet_dyns[i].randomizer_len; ++j) {
 370                 uint8_t val = (uint8_t) mt_rand_int32();
 371                 struct randomizer *randomizer = &packet_dyns[i].randomizer[j];
 372
 373                 randomizer->val = val;
 374                 packets[i].payload[randomizer->off] = val;
 375         }
 376 }
 377
 378 static void tx_precheck(struct mode *mode)
 379 {
 380         int i, mtu;
 381
 382         if (!mode)
 383                 panic("Panic over invalid args for TX trigger!\n");
 384         if (packets_len == 0 || packets_len != packet_dyn_len)
 385                 panic("Panic over invalid args for TX trigger!\n");
 386         if (!device_up_and_running(mode->device))
 387                 panic("Device not up and running!\n");
 388
 389         mtu = device_mtu(mode->device);
 390
 391         for (i = 0; i < packets_len; ++i) {
 392                 if (packets[i].len > mtu + 14)
 393                         panic("Device MTU < than your packet size!\n");
 394                 if (packets[i].len <= 14)
 395                         panic("Device packet size too short!\n");
 396         }
 397 }
 398
 399 static void tx_slowpath_or_die(struct mode *mode)
 400 {
 401         int ifindex, ret;
 402         unsigned int i;
 403         struct sockaddr_ll s_addr;
 404         unsigned long num = 1;
 405
 406         tx_precheck(mode);
 407
 408         sock = pf_socket();
 409
 410         ifindex = device_ifindex(mode->device);
 411
 412         if (mode->num > 0)
 413                 num = mode->num;
 414         if (mode->rand)
 415                 printf("Note: randomizes output makes trafgen slower!\n");
 416
 417         printf("MD: TX slowpath %s %luus\n\n", mode->rand ? "RND" : "RR", mode->gap);
 418         printf("Running! Hang up with ^C!\n\n");
 419
 420         fmemset(&s_addr, 0, sizeof(s_addr));
 421         s_addr.sll_family = PF_PACKET;
 422         s_addr.sll_halen = ETH_ALEN;
 423         s_addr.sll_ifindex = ifindex;
 424
 425         i = 0;
 426
 427         while (likely(sigint == 0) && likely(num > 0)) {
 428                 apply_counter(i);
 429                 apply_randomizer(i);
 430
 431                 ret = sendto(sock, packets[i].payload, packets[i].len, 0,
 432                              (struct sockaddr *) &s_addr, sizeof(s_addr));
 433                 if (ret < 0)
 434                         whine("sendto error!\n");
 435
 436                 mode->stats.tx_bytes += packets[i].len;
 437                 mode->stats.tx_packets++;
 438
 439                 if (mode->rand) {
 440                         i = mt_rand_int32() % packets_len;
 441                 } else {
 442                         i++;
 443                         atomic_cmp_swp(&i, packets_len, 0);
 444                 }
 445
 446                 if (mode->num > 0)
 447                         num--;
 448
 449                 usleep(mode->gap);
 450         }
 451
 452         close(sock);
 453
 454         fflush(stdout);
 455         printf("\n");
 456         printf("\r%12lu frames outgoing\n", mode->stats.tx_packets);
 457         printf("\r%12lu bytes outgoing\n", mode->stats.tx_bytes);
 458 }
 459
 460 static void tx_fastpath_or_die(struct mode *mode)
 461 {
 462         int irq, ifindex;
 463         unsigned int i, size, it = 0;
 464         unsigned long num = 1;
 465         uint8_t *out = NULL;
 466         struct ring tx_ring;
 467         struct frame_map *hdr;
 468
 469         tx_precheck(mode);
 470
 471         sock = pf_socket();
 472
 473         fmemset(&tx_ring, 0, sizeof(tx_ring));
 474         ifindex = device_ifindex(mode->device);
 475         size = ring_size(mode->device, mode->reserve_size);
 476
 477         set_packet_loss_discard(sock);
 478         setup_tx_ring_layout(sock, &tx_ring, size, mode->jumbo_support);
 479         create_tx_ring(sock, &tx_ring);
 480         mmap_tx_ring(sock, &tx_ring);
 481         alloc_tx_ring_frames(&tx_ring);
 482         bind_tx_ring(sock, &tx_ring, ifindex);
 483
 484         if (mode->cpu >= 0 && ifindex > 0) {
 485                 irq = device_irq_number(mode->device);
 486                 device_bind_irq_to_cpu(mode->cpu, irq);
 487                 printf("IRQ: %s:%d > CPU%d\n", mode->device, irq,
 488                        mode->cpu);
 489         }
 490
 491         if (mode->kpull)
 492                 interval = mode->kpull;
 493         if (mode->num > 0)
 494                 num = mode->num;
 495         if (mode->rand)
 496                 printf("Note: randomizes output makes trafgen slower!\n");
 497
 498         printf("MD: TX fastpath %s %luus\n\n", mode->rand ? "RND" : "RR", interval);
 499         printf("Running! Hang up with ^C!\n\n");
 500
 501         itimer.it_interval.tv_sec = 0;
 502         itimer.it_interval.tv_usec = interval;
 503         itimer.it_value.tv_sec = 0;
 504         itimer.it_value.tv_usec = interval;
 505         setitimer(ITIMER_REAL, &itimer, NULL);
 506
 507         i = 0;
 508
 509         while (likely(sigint == 0) && likely(num > 0)) {
 510                 while (user_may_pull_from_tx(tx_ring.frames[it].iov_base) &&
 511                        likely(num > 0)) {
 512                         hdr = tx_ring.frames[it].iov_base;
 513
 514                         /* Kernel assumes: data = ph.raw + po->tp_hdrlen -
 515                          *                        sizeof(struct sockaddr_ll); */
 516                         out = ((uint8_t *) hdr) + TPACKET_HDRLEN -
 517                               sizeof(struct sockaddr_ll);
 518
 519                         hdr->tp_h.tp_snaplen = packets[i].len;
 520                         hdr->tp_h.tp_len = packets[i].len;
 521
 522                         apply_counter(i);
 523                         apply_randomizer(i);
 524
 525                         fmemcpy(out, packets[i].payload, packets[i].len);
 526
 527                         mode->stats.tx_bytes += packets[i].len;
 528                         mode->stats.tx_packets++;
 529
 530                         if (mode->rand) {
 531                                 i = mt_rand_int32() % packets_len;
 532                         } else {
 533                                 i++;
 534                                 atomic_cmp_swp(&i, packets_len, 0);
 535                         }
 536
 537                         kernel_may_pull_from_tx(&hdr->tp_h);
 538                         next_slot_prewr(&it, &tx_ring);
 539
 540                         if (mode->num > 0)
 541                                 num--;
 542                         if (unlikely(sigint == 1))
 543                                 break;
 544                 }
 545         }
 546
 547         destroy_tx_ring(sock, &tx_ring);
 548         close(sock);
 549
 550         fflush(stdout);
 551         printf("\n");
 552         printf("\r%12lu frames outgoing\n", mode->stats.tx_packets);
 553         printf("\r%12lu bytes outgoing\n", mode->stats.tx_bytes);
 554 }
 555
 556 static void cleanup_packets(void)
 557 {
 558         int i;
 559
 560         for (i = 0; i < packets_len; ++i) {
 561                 if (packets[i].len > 0)
 562                         xfree(packets[i].payload);
 563         }
 564
 565         if (packets_len > 0)
 566                 xfree(packets);
 567
 568         for (i = 0; i < packet_dyn_len; ++i) {
 569                 if (packet_dyns[i].counter_len > 0)
 570                         xfree(packet_dyns[i].counter);
 571
 572                 if (packet_dyns[i].randomizer_len > 0)
 573                         xfree(packet_dyns[i].randomizer);
 574         }
 575
 576         if (packet_dyn_len > 0)
 577                 xfree(packet_dyns);
 578 }
 579
 580 static void main_loop(struct mode *mode, char *confname)
 581 {
 582         compile_packets(confname, mode->verbose);
 583
 584         if (mode->gap > 0)
 585                 tx_slowpath_or_die(mode);
 586         else
 587                 tx_fastpath_or_die(mode);
 588
 589         cleanup_packets();
 590 }
 591
 592 int main(int argc, char **argv)
 593 {
 594         int c, opt_index, i, j, interactive = 0;
 595         char *confname = NULL, *ptr;
 596         bool prio_high = false;
 597         struct mode mode;
 598
 599         check_for_root_maybe_die();
 600
 601         fmemset(&mode, 0, sizeof(mode));
 602         mode.cpu = CPU_UNKNOWN;
 603         mode.gap = 0;
 604         mode.num = 0;
 605
 606         while ((c = getopt_long(argc, argv, short_options, long_options,
 607                &opt_index)) != EOF) {
 608                 switch (c) {
 609                 case 'h':
 610                         help();
 611                         break;
 612                 case 'v':
 613                         version();
 614                         break;
 615                 case 'V':
 616                         mode.verbose = 1;
 617                         break;
 618                 case 'd':
 619                 case 'o':
 620                         mode.device = xstrndup(optarg, IFNAMSIZ);
 621                         break;
 622                 case 'x':
 623                         interactive = 1;
 624                         break;
 625                 case 'r':
 626                         mode.rand = 1;
 627                         break;
 628                 case 'J':
 629                         mode.jumbo_support = 1;
 630                         break;
 631                 case 'c':
 632                 case 'i':
 633                         confname = xstrdup(optarg);
 634                         break;
 635                 case 'k':
 636                         mode.kpull = atol(optarg);
 637                         break;
 638                 case 'n':
 639                         mode.num = atol(optarg);
 640                         break;
 641                 case 't':
 642                         mode.gap = atol(optarg);
 643                         break;
 644                 case 'S':
 645                         ptr = optarg;
 646                         mode.reserve_size = 0;
 647
 648                         for (j = i = strlen(optarg); i > 0; --i) {
 649                                 if (!isdigit(optarg[j - i]))
 650                                         break;
 651                                 ptr++;
 652                         }
 653
 654                         if (!strncmp(ptr, "KB", strlen("KB")))
 655                                 mode.reserve_size = 1 << 10;
 656                         else if (!strncmp(ptr, "MB", strlen("MB")))
 657                                 mode.reserve_size = 1 << 20;
 658                         else if (!strncmp(ptr, "GB", strlen("GB")))
 659                                 mode.reserve_size = 1 << 30;
 660                         else
 661                                 panic("Syntax error in ring size param!\n");
 662                         *ptr = 0;
 663
 664                         mode.reserve_size *= atoi(optarg);
 665                         break;
 666                 case 'b':
 667                         set_cpu_affinity(optarg, 0);
 668                         /* Take the first CPU for rebinding the IRQ */
 669                         if (mode.cpu != CPU_NOTOUCH)
 670                                 mode.cpu = atoi(optarg);
 671                         break;
 672                 case 'B':
 673                         set_cpu_affinity(optarg, 1);
 674                         break;
 675                 case 'H':
 676                         prio_high = true;
 677                         break;
 678                 case 'Q':
 679                         mode.cpu = CPU_NOTOUCH;
 680                         break;
 681                 case '?':
 682                         switch (optopt) {
 683                         case 'd':
 684                         case 'c':
 685                         case 'n':
 686                         case 'S':
 687                         case 'b':
 688                         case 'o':
 689                         case 'i':
 690                         case 'k':
 691                         case 'B':
 692                         case 't':
 693                                 panic("Option -%c requires an argument!\n",
 694                                       optopt);
 695                         default:
 696                                 if (isprint(optopt))
 697                                         whine("Unknown option character "
 698                                               "`0x%X\'!\n", optopt);
 699                                 die();
 700                         }
 701                 default:
 702                         break;
 703                 }
 704         }
 705
 706         if (!interactive && argc < 5)
 707                 help();
 708         if (interactive && argc < 2)
 709                 help();
 710         if (!interactive && mode.device == NULL)
 711                 panic("No networking device given!\n");
 712         if (!interactive && confname == NULL)
 713                 panic("No configuration file given!\n");
 714         if (!interactive && device_mtu(mode.device) == 0)
 715                 panic("This is no networking device!\n");
 716         if (!interactive && device_up_and_running(mode.device) == 0)
 717                 panic("Networking device not running!\n");
 718
 719         register_signal(SIGINT, signal_handler);
 720         register_signal(SIGHUP, signal_handler);
 721         register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO);
 722
 723         header();
 724
 725         if (prio_high == true) {
 726                 set_proc_prio(get_default_proc_prio());
 727                 set_sched_status(get_default_sched_policy(),
 728                                  get_default_sched_prio());
 729         }
 730
 731         if (interactive)
 732                 main_loop_interactive(&mode, confname);
 733         else
 734                 main_loop(&mode, confname);
 735
 736         if (mode.device)
 737                 xfree(mode.device);
 738         if (confname)
 739                 xfree(confname);
 740
 741         return 0;
 742 }