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 #include <stdio.h>
  25 #include <string.h>
  26 #include <getopt.h>
  27 #include <ctype.h>
  28 #include <stdbool.h>
  29 #include <sys/socket.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/time.h>
  33 #include <signal.h>
  34 #include <stdint.h>
  35 #include <stdlib.h>
  36 #include <fcntl.h>
  37 #include <time.h>
  38 #include <net/ethernet.h>
  39
  40 #include "xmalloc.h"
  41 #include "die.h"
  42 #include "mac80211.h"
  43 #include "xutils.h"
  44 #include "xio.h"
  45 #include "trafgen_conf.h"
  46 #include "tprintf.h"
  47 #include "mtrand.h"
  48 #include "ring_tx.h"
  49
  50 struct stats {
  51         unsigned long tx_bytes;
  52         unsigned long tx_packets;
  53 };
  54
  55 struct mode {
  56 #define CPU_UNKNOWN  -1
  57 #define CPU_NOTOUCH  -2
  58         struct stats stats;
  59         char *device;
  60         char *device_trans;
  61         int cpu;
  62         int rand;
  63         int rfraw;
  64         unsigned long kpull;
  65         /* 0 for automatic, > 0 for manual */
  66         unsigned int reserve_size;
  67         int jumbo_support;
  68         int verbose;
  69         unsigned long num;
  70         unsigned long gap;
  71 };
  72
  73 static int sock;
  74 static struct itimerval itimer;
  75 static unsigned long interval = TX_KERNEL_PULL_INT;
  76
  77 sig_atomic_t sigint = 0;
  78
  79 struct packet *packets = NULL;
  80 unsigned int packets_len = 0;
  81
  82 struct packet_dynamics *packet_dyns = NULL;
  83 unsigned int packet_dyn_len = 0;
  84
  85 static const char *short_options = "d:c:n:t:vJhS:HQb:B:rk:i:o:VRA";
  86
  87 static struct option long_options[] = {
  88         {"dev", required_argument, 0, 'd'},
  89         {"out", required_argument, 0, 'o'},
  90         {"in", required_argument, 0, 'i'},
  91         {"conf", required_argument, 0, 'c'},
  92         {"num", required_argument, 0, 'n'},
  93         {"gap", required_argument, 0, 't'},
  94         {"ring-size", required_argument, 0, 'S'},
  95         {"bind-cpu", required_argument, 0, 'b'},
  96         {"unbind-cpu", required_argument, 0, 'B'},
  97         {"kernel-pull", required_argument, 0, 'k'},
  98         {"jumbo-support", no_argument, 0, 'J'},
  99         {"rfraw", no_argument, 0, 'R'},
 100         {"rand", no_argument, 0, 'r'},
 101         {"prio-high", no_argument, 0, 'H'},
 102         {"notouch-irq", no_argument, 0, 'Q'},
 103         {"verbose", no_argument, 0, 'V'},
 104         {"no-sock-mem", no_argument, 0, 'A'},
 105         {"version", no_argument, 0, 'v'},
 106         {"help", no_argument, 0, 'h'},
 107         {0, 0, 0, 0}
 108 };
 109
 110 static void signal_handler(int number)
 111 {
 112         switch (number) {
 113         case SIGINT:
 114                 sigint = 1;
 115                 break;
 116         case SIGHUP:
 117         default:
 118                 break;
 119         }
 120 }
 121
 122 static void timer_elapsed(int number)
 123 {
 124         itimer.it_interval.tv_sec = 0;
 125         itimer.it_interval.tv_usec = interval;
 126         itimer.it_value.tv_sec = 0;
 127         itimer.it_value.tv_usec = interval;
 128
 129         pull_and_flush_tx_ring(sock);
 130         setitimer(ITIMER_REAL, &itimer, NULL);
 131 }
 132
 133 static void header(void)
 134 {
 135         printf("%s%s%s\n", colorize_start(bold), "trafgen "
 136                VERSION_STRING, colorize_end());
 137 }
 138
 139 static void help(void)
 140 {
 141         printf("\ntrafgen %s, high-perf zero-copy network packet generator\n",
 142                VERSION_STRING);
 143         printf("http://www.netsniff-ng.org\n\n");
 144         printf("Usage: trafgen [options]\n");
 145         printf("Options:\n");
 146 /*      printf("  -o|-d|--out|--dev <netdev|pcap>   Networking Device i.e., eth0 or pcap\n"); */
 147         printf("  -o|-d|--out|--dev <netdev>        Networking Device i.e., eth0\n");
 148         printf("  -i|-c|--in|--conf <cfg-file>      Packet configuration file\n");
 149         printf("  -J|--jumbo-support                Support for 64KB Super Jumbo Frames\n");
 150         printf("                                    Default TX slot: 2048Byte\n");
 151         printf("  -R|--rfraw                        Inject raw 802.11 frames\n");
 152         printf("  -n|--num <uint>                   Number of packets until exit\n");
 153         printf("  `--     0                         Loop until interrupt (default)\n");
 154         printf("   `-     n                         Send n packets and done\n");
 155         printf("  -r|--rand                         Randomize packet selection process\n");
 156         printf("                                    Instead of a round robin selection\n");
 157         printf("  -t|--gap <uint>                   Interpacket gap in us (approx)\n");
 158         printf("  -A|--no-sock-mem                  Don't tune core socket memory\n");
 159         printf("  -S|--ring-size <size>             Manually set ring size to <size>:\n");
 160         printf("                                    mmap space in KB/MB/GB, e.g. \'10MB\'\n");
 161         printf("  -k|--kernel-pull <uint>           Kernel pull from user interval in us\n");
 162         printf("                                    Default is 10us where the TX_RING\n");
 163         printf("                                    is populated with payload from uspace\n");
 164         printf("  -b|--bind-cpu <cpu>               Bind to specific CPU (or CPU-range)\n");
 165         printf("  -B|--unbind-cpu <cpu>             Forbid to use specific CPU (or CPU-range)\n");
 166         printf("  -H|--prio-high                    Make this high priority process\n");
 167         printf("  -Q|--notouch-irq                  Do not touch IRQ CPU affinity of NIC\n");
 168         printf("  -v|--version                      Show version\n");
 169         printf("  -h|--help                         Guess what?!\n");
 170         printf("\n");
 171         printf("Examples:\n");
 172         printf("  See trafgen.txf for configuration file examples.\n");
 173         printf("  trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0\n");
 174         printf("  trafgen --dev wlan0 --rfraw --conf beacon-test.txf --bind-cpu 0 -A\n");
 175         printf("  trafgen --out eth0 --in trafgen.txf --bind-cpu 0\n");
 176 /*      printf("  trafgen --out test.pcap --in trafgen.txf --bind-cpu 0\n"); */
 177         printf("  trafgen --dev eth0 --conf trafgen.txf --rand --gap 1000\n");
 178         printf("  trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0 --num 10 --rand\n");
 179         printf("\n");
 180         printf("Note:\n");
 181         printf("  This tool is targeted for network developers! You should\n");
 182         printf("  be aware of what you are doing and what these options above\n");
 183         printf("  mean! Only use this tool in an isolated LAN that you own!\n");
 184         printf("\n");
 185         printf("Please report bugs to <bugs@netsniff-ng.org>\n");
 186         printf("Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n");
 187         printf("Swiss federal institute of technology (ETH Zurich)\n");
 188         printf("License: GNU GPL version 2\n");
 189         printf("This is free software: you are free to change and redistribute it.\n");
 190         printf("There is NO WARRANTY, to the extent permitted by law.\n\n");
 191         die();
 192 }
 193
 194 static void version(void)
 195 {
 196         printf("\ntrafgen %s, high-perf zero-copy network packet generator\n",
 197                VERSION_STRING);
 198         printf("http://www.netsniff-ng.org\n\n");
 199         printf("Please report bugs to <bugs@netsniff-ng.org>\n");
 200         printf("Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n");
 201         printf("Swiss federal institute of technology (ETH Zurich)\n");
 202         printf("License: GNU GPL version 2\n");
 203         printf("This is free software: you are free to change and redistribute it.\n");
 204         printf("There is NO WARRANTY, to the extent permitted by law.\n\n");
 205         die();
 206 }
 207
 208 static inline void apply_counter(int i)
 209 {
 210         int j;
 211
 212         for (j = 0; j < packet_dyns[i].counter_len; ++j) {
 213                 uint8_t val;
 214                 struct counter *counter = &packet_dyns[i].counter[j];
 215
 216                 val = counter->val;
 217                 val -= counter->min;
 218
 219                 if (counter->type == TYPE_INC)
 220                         val = (val + counter->inc) %
 221                               (counter->max - counter->min + 1);
 222                 else
 223                         val = (val - counter->inc) %
 224                               (counter->min - counter->max + 1);
 225
 226                 val += counter->min;
 227                 counter->val = val;
 228
 229                 packets[i].payload[counter->off] = val;
 230         }
 231 }
 232
 233 static inline void apply_randomizer(int i)
 234 {
 235         int j;
 236
 237         for (j = 0; j < packet_dyns[i].randomizer_len; ++j) {
 238                 uint8_t val = (uint8_t) mt_rand_int32();
 239                 struct randomizer *randomizer = &packet_dyns[i].randomizer[j];
 240
 241                 randomizer->val = val;
 242                 packets[i].payload[randomizer->off] = val;
 243         }
 244 }
 245
 246 static void tx_precheck(struct mode *mode)
 247 {
 248         int i, mtu;
 249
 250         if (!mode)
 251                 panic("Panic over invalid args for TX trigger!\n");
 252         if (packets_len == 0 || packets_len != packet_dyn_len)
 253                 panic("Panic over invalid args for TX trigger!\n");
 254         if (!mode->rfraw && !device_up_and_running(mode->device))
 255                 panic("Device not up and running!\n");
 256
 257         mtu = device_mtu(mode->device);
 258
 259         for (i = 0; i < packets_len; ++i) {
 260                 if (packets[i].len > mtu + 14)
 261                         panic("Device MTU < than your packet size!\n");
 262                 if (packets[i].len <= 14)
 263                         panic("Device packet size too short!\n");
 264         }
 265 }
 266
 267 static void tx_slowpath_or_die(struct mode *mode)
 268 {
 269         int ifindex, ret;
 270         unsigned int i;
 271         struct sockaddr_ll s_addr;
 272         unsigned long num = 1;
 273         struct timeval start, end, diff;
 274
 275         tx_precheck(mode);
 276
 277         sock = pf_socket();
 278
 279         if (mode->rfraw) {
 280                 mode->device_trans = xstrdup(mode->device);
 281                 xfree(mode->device);
 282
 283                 enter_rfmon_mac80211(mode->device_trans, &mode->device);
 284         }
 285
 286         ifindex = device_ifindex(mode->device);
 287
 288         if (mode->num > 0)
 289                 num = mode->num;
 290         if (mode->rand)
 291                 printf("Note: randomizes output makes trafgen slower!\n");
 292
 293         printf("MD: TX slowpath %s %luus", mode->rand ? "RND" : "RR", mode->gap);
 294         if (mode->rfraw)
 295                 printf(" 802.11 raw via %s", mode->device);
 296         printf("\n\n");
 297         printf("Running! Hang up with ^C!\n\n");
 298
 299         fmemset(&s_addr, 0, sizeof(s_addr));
 300         s_addr.sll_family = PF_PACKET;
 301         s_addr.sll_halen = ETH_ALEN;
 302         s_addr.sll_ifindex = ifindex;
 303
 304         i = 0;
 305
 306         gettimeofday(&start, NULL);
 307
 308         while (likely(sigint == 0) && likely(num > 0)) {
 309                 apply_counter(i);
 310                 apply_randomizer(i);
 311
 312                 ret = sendto(sock, packets[i].payload, packets[i].len, 0,
 313                              (struct sockaddr *) &s_addr, sizeof(s_addr));
 314                 if (ret < 0)
 315                         whine("sendto error!\n");
 316
 317                 mode->stats.tx_bytes += packets[i].len;
 318                 mode->stats.tx_packets++;
 319
 320                 if (mode->rand) {
 321                         i = mt_rand_int32() % packets_len;
 322                 } else {
 323                         i++;
 324                         atomic_cmp_swp(&i, packets_len, 0);
 325                 }
 326
 327                 if (mode->num > 0)
 328                         num--;
 329
 330                 usleep(mode->gap);
 331         }
 332
 333         gettimeofday(&end, NULL);
 334         diff = tv_subtract(end, start);
 335
 336         if (mode->rfraw)
 337                 leave_rfmon_mac80211(mode->device_trans, mode->device);
 338
 339         close(sock);
 340
 341         fflush(stdout);
 342         printf("\n");
 343         printf("\r%12lu frames outgoing\n", mode->stats.tx_packets);
 344         printf("\r%12lu bytes outgoing\n", mode->stats.tx_bytes);
 345         printf("\r%12lu sec, %lu usec in total\n", diff.tv_sec, diff.tv_usec);
 346 }
 347
 348 static void tx_fastpath_or_die(struct mode *mode)
 349 {
 350         int irq, ifindex;
 351         unsigned int i, size, it = 0;
 352         unsigned long num = 1;
 353         uint8_t *out = NULL;
 354         struct ring tx_ring;
 355         struct frame_map *hdr;
 356         struct timeval start, end, diff;
 357
 358         tx_precheck(mode);
 359
 360         sock = pf_socket();
 361
 362         fmemset(&tx_ring, 0, sizeof(tx_ring));
 363
 364         if (mode->rfraw) {
 365                 mode->device_trans = xstrdup(mode->device);
 366                 xfree(mode->device);
 367
 368                 enter_rfmon_mac80211(mode->device_trans, &mode->device);
 369         }
 370
 371         ifindex = device_ifindex(mode->device);
 372         size = ring_size(mode->device, mode->reserve_size);
 373
 374         set_packet_loss_discard(sock);
 375         setup_tx_ring_layout(sock, &tx_ring, size, mode->jumbo_support);
 376         create_tx_ring(sock, &tx_ring);
 377         mmap_tx_ring(sock, &tx_ring);
 378         alloc_tx_ring_frames(&tx_ring);
 379         bind_tx_ring(sock, &tx_ring, ifindex);
 380
 381         if (mode->cpu >= 0 && ifindex > 0) {
 382                 irq = device_irq_number(mode->device);
 383                 device_bind_irq_to_cpu(mode->cpu, irq);
 384                 printf("IRQ: %s:%d > CPU%d\n", mode->device, irq,
 385                        mode->cpu);
 386         }
 387
 388         if (mode->kpull)
 389                 interval = mode->kpull;
 390         if (mode->num > 0)
 391                 num = mode->num;
 392         if (mode->rand)
 393                 printf("Note: randomizes output makes trafgen slower!\n");
 394
 395         printf("MD: TX fastpath %s %luus", mode->rand ? "RND" : "RR", interval);
 396         if (mode->rfraw)
 397                 printf(" 802.11 raw via %s", mode->device);
 398         printf("\n\n");
 399         printf("Running! Hang up with ^C!\n\n");
 400
 401         itimer.it_interval.tv_sec = 0;
 402         itimer.it_interval.tv_usec = interval;
 403         itimer.it_value.tv_sec = 0;
 404         itimer.it_value.tv_usec = interval;
 405         setitimer(ITIMER_REAL, &itimer, NULL);
 406
 407         i = 0;
 408
 409         gettimeofday(&start, NULL);
 410
 411         while (likely(sigint == 0) && likely(num > 0)) {
 412                 while (user_may_pull_from_tx(tx_ring.frames[it].iov_base) &&
 413                        likely(num > 0)) {
 414                         hdr = tx_ring.frames[it].iov_base;
 415
 416                         /* Kernel assumes: data = ph.raw + po->tp_hdrlen -
 417                          *                        sizeof(struct sockaddr_ll); */
 418                         out = ((uint8_t *) hdr) + TPACKET_HDRLEN -
 419                               sizeof(struct sockaddr_ll);
 420
 421                         hdr->tp_h.tp_snaplen = packets[i].len;
 422                         hdr->tp_h.tp_len = packets[i].len;
 423
 424                         apply_counter(i);
 425                         apply_randomizer(i);
 426
 427                         fmemcpy(out, packets[i].payload, packets[i].len);
 428
 429                         mode->stats.tx_bytes += packets[i].len;
 430                         mode->stats.tx_packets++;
 431
 432                         if (mode->rand) {
 433                                 i = mt_rand_int32() % packets_len;
 434                         } else {
 435                                 i++;
 436                                 atomic_cmp_swp(&i, packets_len, 0);
 437                         }
 438
 439                         kernel_may_pull_from_tx(&hdr->tp_h);
 440                         next_slot_prewr(&it, &tx_ring);
 441
 442                         if (mode->num > 0)
 443                                 num--;
 444                         if (unlikely(sigint == 1))
 445                                 break;
 446                 }
 447         }
 448
 449         gettimeofday(&end, NULL);
 450         diff = tv_subtract(end, start);
 451
 452         destroy_tx_ring(sock, &tx_ring);
 453
 454         if (mode->rfraw)
 455                 leave_rfmon_mac80211(mode->device_trans, mode->device);
 456
 457         close(sock);
 458
 459         fflush(stdout);
 460         printf("\n");
 461         printf("\r%12lu frames outgoing\n", mode->stats.tx_packets);
 462         printf("\r%12lu bytes outgoing\n", mode->stats.tx_bytes);
 463         printf("\r%12lu sec, %lu usec in total\n", diff.tv_sec, diff.tv_usec);
 464 }
 465
 466 static void main_loop(struct mode *mode, char *confname)
 467 {
 468         compile_packets(confname, mode->verbose);
 469
 470         if (mode->gap > 0)
 471                 tx_slowpath_or_die(mode);
 472         else
 473                 tx_fastpath_or_die(mode);
 474
 475         cleanup_packets();
 476 }
 477
 478 int main(int argc, char **argv)
 479 {
 480         int c, opt_index, i, j;
 481         int vals[4] = {0};
 482         char *confname = NULL, *ptr;
 483         bool prio_high = false;
 484         bool setsockmem = true;
 485         struct mode mode;
 486
 487         check_for_root_maybe_die();
 488
 489         fmemset(&mode, 0, sizeof(mode));
 490         mode.cpu = CPU_UNKNOWN;
 491         mode.gap = 0;
 492         mode.num = 0;
 493
 494         while ((c = getopt_long(argc, argv, short_options, long_options,
 495                &opt_index)) != EOF) {
 496                 switch (c) {
 497                 case 'h':
 498                         help();
 499                         break;
 500                 case 'v':
 501                         version();
 502                         break;
 503                 case 'V':
 504                         mode.verbose = 1;
 505                         break;
 506                 case 'd':
 507                 case 'o':
 508                         mode.device = xstrndup(optarg, IFNAMSIZ);
 509                         break;
 510                 case 'r':
 511                         mode.rand = 1;
 512                         break;
 513                 case 'R':
 514                         mode.rfraw = 1;
 515                         break;
 516                 case 'J':
 517                         mode.jumbo_support = 1;
 518                         break;
 519                 case 'c':
 520                 case 'i':
 521                         confname = xstrdup(optarg);
 522                         break;
 523                 case 'k':
 524                         mode.kpull = atol(optarg);
 525                         break;
 526                 case 'n':
 527                         mode.num = atol(optarg);
 528                         break;
 529                 case 't':
 530                         mode.gap = atol(optarg);
 531                         break;
 532                 case 'A':
 533                         setsockmem = false;
 534                         break;
 535                 case 'S':
 536                         ptr = optarg;
 537                         mode.reserve_size = 0;
 538
 539                         for (j = i = strlen(optarg); i > 0; --i) {
 540                                 if (!isdigit(optarg[j - i]))
 541                                         break;
 542                                 ptr++;
 543                         }
 544
 545                         if (!strncmp(ptr, "KB", strlen("KB")))
 546                                 mode.reserve_size = 1 << 10;
 547                         else if (!strncmp(ptr, "MB", strlen("MB")))
 548                                 mode.reserve_size = 1 << 20;
 549                         else if (!strncmp(ptr, "GB", strlen("GB")))
 550                                 mode.reserve_size = 1 << 30;
 551                         else
 552                                 panic("Syntax error in ring size param!\n");
 553                         *ptr = 0;
 554
 555                         mode.reserve_size *= atoi(optarg);
 556                         break;
 557                 case 'b':
 558                         set_cpu_affinity(optarg, 0);
 559                         /* Take the first CPU for rebinding the IRQ */
 560                         if (mode.cpu != CPU_NOTOUCH)
 561                                 mode.cpu = atoi(optarg);
 562                         break;
 563                 case 'B':
 564                         set_cpu_affinity(optarg, 1);
 565                         break;
 566                 case 'H':
 567                         prio_high = true;
 568                         break;
 569                 case 'Q':
 570                         mode.cpu = CPU_NOTOUCH;
 571                         break;
 572                 case '?':
 573                         switch (optopt) {
 574                         case 'd':
 575                         case 'c':
 576                         case 'n':
 577                         case 'S':
 578                         case 'b':
 579                         case 'o':
 580                         case 'i':
 581                         case 'k':
 582                         case 'B':
 583                         case 't':
 584                                 panic("Option -%c requires an argument!\n",
 585                                       optopt);
 586                         default:
 587                                 if (isprint(optopt))
 588                                         whine("Unknown option character "
 589                                               "`0x%X\'!\n", optopt);
 590                                 die();
 591                         }
 592                 default:
 593                         break;
 594                 }
 595         }
 596
 597         if (argc < 5)
 598                 help();
 599         if (mode.device == NULL)
 600                 panic("No networking device given!\n");
 601         if (confname == NULL)
 602                 panic("No configuration file given!\n");
 603         if (device_mtu(mode.device) == 0)
 604                 panic("This is no networking device!\n");
 605         if (!mode.rfraw && device_up_and_running(mode.device) == 0)
 606                 panic("Networking device not running!\n");
 607
 608         register_signal(SIGINT, signal_handler);
 609         register_signal(SIGHUP, signal_handler);
 610         register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO);
 611
 612         header();
 613
 614         if (prio_high == true) {
 615                 set_proc_prio(get_default_proc_prio());
 616                 set_sched_status(get_default_sched_policy(),
 617                                  get_default_sched_prio());
 618         }
 619
 620         if (setsockmem == true) {
 621                 if ((vals[0] = get_system_socket_mem(sock_rmem_max)) < SMEM_SUG_MAX)
 622                         set_system_socket_mem(sock_rmem_max, SMEM_SUG_MAX);
 623                 if ((vals[1] = get_system_socket_mem(sock_rmem_def)) < SMEM_SUG_DEF)
 624                         set_system_socket_mem(sock_rmem_def, SMEM_SUG_DEF);
 625                 if ((vals[2] = get_system_socket_mem(sock_wmem_max)) < SMEM_SUG_MAX)
 626                         set_system_socket_mem(sock_wmem_max, SMEM_SUG_MAX);
 627                 if ((vals[3] = get_system_socket_mem(sock_wmem_def)) < SMEM_SUG_DEF)
 628                         set_system_socket_mem(sock_wmem_def, SMEM_SUG_DEF);
 629         }
 630
 631         main_loop(&mode, confname);
 632
 633         if (setsockmem == true) {
 634                 set_system_socket_mem(sock_rmem_max, vals[0]);
 635                 set_system_socket_mem(sock_rmem_def, vals[1]);
 636                 set_system_socket_mem(sock_wmem_max, vals[2]);
 637                 set_system_socket_mem(sock_wmem_def, vals[3]);
 638         }
 639
 640         free(mode.device);
 641         free(mode.device_trans);
 642         free(confname);
 643
 644         return 0;
 645 }