app/dumpcap/main.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2019-2020 Microsoft Corporation
   3  *
   4  * DPDK application to dump network traffic
   5  * This is designed to look and act like the Wireshark
   6  * dumpcap program.
   7  */
   8
   9 #include <errno.h>
  10 #include <fcntl.h>
  11 #include <getopt.h>
  12 #include <inttypes.h>
  13 #include <limits.h>
  14 #include <signal.h>
  15 #include <stdbool.h>
  16 #include <stdint.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <sys/queue.h>
  21 #include <sys/types.h>
  22 #include <sys/utsname.h>
  23 #include <time.h>
  24 #include <unistd.h>
  25
  26 #include <rte_alarm.h>
  27 #include <rte_bpf.h>
  28 #include <rte_config.h>
  29 #include <rte_debug.h>
  30 #include <rte_eal.h>
  31 #include <rte_errno.h>
  32 #include <rte_ethdev.h>
  33 #include <rte_lcore.h>
  34 #include <rte_malloc.h>
  35 #include <rte_mbuf.h>
  36 #include <rte_mempool.h>
  37 #include <rte_pcapng.h>
  38 #include <rte_pdump.h>
  39 #include <rte_ring.h>
  40 #include <rte_string_fns.h>
  41 #include <rte_time.h>
  42 #include <rte_version.h>
  43
  44 #include <pcap/pcap.h>
  45 #include <pcap/bpf.h>
  46
  47 #define RING_NAME "capture-ring"
  48 #define MONITOR_INTERVAL  (500 * 1000)
  49 #define MBUF_POOL_CACHE_SIZE 32
  50 #define BURST_SIZE 32
  51 #define SLEEP_THRESHOLD 1000
  52
  53 /* command line flags */
  54 static const char *progname;
  55 static bool quit_signal;
  56 static bool group_read;
  57 static bool quiet;
  58 static bool promiscuous_mode = true;
  59 static bool use_pcapng = true;
  60 static char *output_name;
  61 static const char *filter_str;
  62 static unsigned int ring_size = 2048;
  63 static const char *capture_comment;
  64 static uint32_t snaplen = RTE_MBUF_DEFAULT_BUF_SIZE;
  65 static bool dump_bpf;
  66 static struct {
  67         uint64_t  duration;     /* nanoseconds */
  68         unsigned long packets;  /* number of packets in file */
  69         size_t size;            /* file size (bytes) */
  70 } stop;
  71
  72 /* Running state */
  73 static struct rte_bpf_prm *bpf_prm;
  74 static uint64_t start_time, end_time;
  75 static uint64_t packets_received;
  76 static size_t file_size;
  77
  78 struct interface {
  79         TAILQ_ENTRY(interface) next;
  80         uint16_t port;
  81         char name[RTE_ETH_NAME_MAX_LEN];
  82
  83         struct rte_rxtx_callback *rx_cb[RTE_MAX_QUEUES_PER_PORT];
  84 };
  85
  86 TAILQ_HEAD(interface_list, interface);
  87 static struct interface_list interfaces = TAILQ_HEAD_INITIALIZER(interfaces);
  88 static struct interface *port2intf[RTE_MAX_ETHPORTS];
  89
  90 /* Can do either pcap or pcapng format output */
  91 typedef union {
  92         rte_pcapng_t  *pcapng;
  93         pcap_dumper_t *dumper;
  94 } dumpcap_out_t;
  95
  96 static void usage(void)
  97 {
  98         printf("Usage: %s [options] ...\n\n", progname);
  99         printf("Capture Interface:\n"
 100                "  -i <interface>           name or port index of interface\n"
 101                "  -f <capture filter>      packet filter in libpcap filter syntax\n");
 102         printf("  -s <snaplen>, --snapshot-length <snaplen>\n"
 103                "                           packet snapshot length (def: %u)\n",
 104                RTE_MBUF_DEFAULT_BUF_SIZE);
 105         printf("  -p, --no-promiscuous-mode\n"
 106                "                           don't capture in promiscuous mode\n"
 107                "  -D, --list-interfaces    print list of interfaces and exit\n"
 108                "  -d                       print generated BPF code for capture filter\n"
 109                "\n"
 110                "Stop conditions:\n"
 111                "  -c <packet count>        stop after n packets (def: infinite)\n"
 112                "  -a <autostop cond.> ..., --autostop <autostop cond.> ...\n"
 113                "                           duration:NUM - stop after NUM seconds\n"
 114                "                           filesize:NUM - stop this file after NUM kB\n"
 115                "                            packets:NUM - stop after NUM packets\n"
 116                "Output (files):\n"
 117                "  -w <filename>            name of file to save (def: tempfile)\n"
 118                "  -g                       enable group read access on the output file(s)\n"
 119                "  -n                       use pcapng format instead of pcap (default)\n"
 120                "  -P                       use libpcap format instead of pcapng\n"
 121                "  --capture-comment <comment>\n"
 122                "                           add a capture comment to the output file\n"
 123                "\n"
 124                "Miscellaneous:\n"
 125                "  -q                       don't report packet capture counts\n"
 126                "  -v, --version            print version information and exit\n"
 127                "  -h, --help               display this help and exit\n"
 128                "\n"
 129                "Use Ctrl-C to stop capturing at any time.\n");
 130 }
 131
 132 static const char *version(void)
 133 {
 134         static char str[128];
 135
 136         snprintf(str, sizeof(str),
 137                  "%s 1.0 (%s)\n", progname, rte_version());
 138         return str;
 139 }
 140
 141 /* Parse numeric argument from command line */
 142 static unsigned long get_uint(const char *arg, const char *name,
 143                              unsigned int limit)
 144 {
 145         unsigned long u;
 146         char *endp;
 147
 148         u = strtoul(arg, &endp, 0);
 149         if (*arg == '\0' || *endp != '\0')
 150                 rte_exit(EXIT_FAILURE,
 151                          "Specified %s \"%s\" is not a valid number\n",
 152                          name, arg);
 153         if (limit && u > limit)
 154                 rte_exit(EXIT_FAILURE,
 155                          "Specified %s \"%s\" is too large (greater than %u)\n",
 156                          name, arg, limit);
 157
 158         return u;
 159 }
 160
 161 /* Set auto stop values */
 162 static void auto_stop(char *opt)
 163 {
 164         char *value, *endp;
 165
 166         value = strchr(opt, ':');
 167         if (value == NULL)
 168                 rte_exit(EXIT_FAILURE,
 169                          "Missing colon in auto stop parameter\n");
 170
 171         *value++ = '\0';
 172         if (strcmp(opt, "duration") == 0) {
 173                 double interval = strtod(value, &endp);
 174
 175                 if (*value == '\0' || *endp != '\0' || interval <= 0)
 176                         rte_exit(EXIT_FAILURE,
 177                                  "Invalid duration \"%s\"\n", value);
 178                 stop.duration = NSEC_PER_SEC * interval;
 179         } else if (strcmp(opt, "filesize") == 0) {
 180                 stop.size = get_uint(value, "filesize", 0) * 1024;
 181         } else if (strcmp(opt, "packets") == 0) {
 182                 stop.packets = get_uint(value, "packets", 0);
 183         } else {
 184                 rte_exit(EXIT_FAILURE,
 185                          "Unknown autostop parameter \"%s\"\n", opt);
 186         }
 187 }
 188
 189 /* Add interface to list of interfaces to capture */
 190 static void add_interface(uint16_t port, const char *name)
 191 {
 192         struct interface *intf;
 193
 194         intf = malloc(sizeof(*intf));
 195         if (!intf)
 196                 rte_exit(EXIT_FAILURE, "no memory for interface\n");
 197
 198         memset(intf, 0, sizeof(*intf));
 199         rte_strscpy(intf->name, name, sizeof(intf->name));
 200
 201         printf("Capturing on '%s'\n", name);
 202
 203         port2intf[port] = intf;
 204         TAILQ_INSERT_TAIL(&interfaces, intf, next);
 205 }
 206
 207 /* Select all valid DPDK interfaces */
 208 static void select_all_interfaces(void)
 209 {
 210         char name[RTE_ETH_NAME_MAX_LEN];
 211         uint16_t p;
 212
 213         RTE_ETH_FOREACH_DEV(p) {
 214                 if (rte_eth_dev_get_name_by_port(p, name) < 0)
 215                         continue;
 216                 add_interface(p, name);
 217         }
 218 }
 219
 220 /*
 221  * Choose interface to capture if no -i option given.
 222  * Select the first DPDK port, this matches what dumpcap does.
 223  */
 224 static void set_default_interface(void)
 225 {
 226         char name[RTE_ETH_NAME_MAX_LEN];
 227         uint16_t p;
 228
 229         RTE_ETH_FOREACH_DEV(p) {
 230                 if (rte_eth_dev_get_name_by_port(p, name) < 0)
 231                         continue;
 232                 add_interface(p, name);
 233                 return;
 234         }
 235         rte_exit(EXIT_FAILURE, "No usable interfaces found\n");
 236 }
 237
 238 /* Lookup interface by name or port and add it to the list */
 239 static void select_interface(const char *arg)
 240 {
 241         uint16_t port;
 242
 243         if (strcmp(arg, "*"))
 244                 select_all_interfaces();
 245         else if (rte_eth_dev_get_port_by_name(arg, &port) == 0)
 246                 add_interface(port, arg);
 247         else {
 248                 char name[RTE_ETH_NAME_MAX_LEN];
 249
 250                 port = get_uint(arg, "port_number", UINT16_MAX);
 251                 if (rte_eth_dev_get_name_by_port(port, name) < 0)
 252                         rte_exit(EXIT_FAILURE, "Invalid port number %u\n",
 253                                  port);
 254                 add_interface(port, name);
 255         }
 256 }
 257
 258 /* Display list of possible interfaces that can be used. */
 259 static void show_interfaces(void)
 260 {
 261         char name[RTE_ETH_NAME_MAX_LEN];
 262         uint16_t p;
 263
 264         RTE_ETH_FOREACH_DEV(p) {
 265                 if (rte_eth_dev_get_name_by_port(p, name) < 0)
 266                         continue;
 267                 printf("%u. %s\n", p, name);
 268         }
 269 }
 270
 271 static void compile_filter(void)
 272 {
 273         struct bpf_program bf;
 274         pcap_t *pcap;
 275
 276         pcap = pcap_open_dead(DLT_EN10MB, snaplen);
 277         if (!pcap)
 278                 rte_exit(EXIT_FAILURE, "can not open pcap\n");
 279
 280         if (pcap_compile(pcap, &bf, filter_str,
 281                          1, PCAP_NETMASK_UNKNOWN) != 0)
 282                 rte_exit(EXIT_FAILURE, "pcap filter string not valid (%s)\n",
 283                          pcap_geterr(pcap));
 284
 285         bpf_prm = rte_bpf_convert(&bf);
 286         if (bpf_prm == NULL)
 287                 rte_exit(EXIT_FAILURE,
 288                          "bpf convert failed\n");
 289
 290         if (dump_bpf) {
 291                 printf("cBPF program (%u insns)\n", bf.bf_len);
 292                 bpf_dump(&bf, 1);
 293                 printf("\neBPF program (%u insns)\n", bpf_prm->nb_ins);
 294                 rte_bpf_dump(stdout, bpf_prm->ins, bpf_prm->nb_ins);
 295                 exit(0);
 296         }
 297
 298         /* Don't care about original program any more */
 299         pcap_freecode(&bf);
 300         pcap_close(pcap);
 301 }
 302
 303 /*
 304  * Parse command line options.
 305  * These are chosen to be similar to dumpcap command.
 306  */
 307 static void parse_opts(int argc, char **argv)
 308 {
 309         static const struct option long_options[] = {
 310                 { "autostop",        required_argument, NULL, 'a' },
 311                 { "capture-comment", required_argument, NULL, 0 },
 312                 { "help",            no_argument,       NULL, 'h' },
 313                 { "interface",       required_argument, NULL, 'i' },
 314                 { "list-interfaces", no_argument,       NULL, 'D' },
 315                 { "no-promiscuous-mode", no_argument,   NULL, 'p' },
 316                 { "output-file",     required_argument, NULL, 'w' },
 317                 { "ring-buffer",     required_argument, NULL, 'b' },
 318                 { "snapshot-length", required_argument, NULL, 's' },
 319                 { "version",         no_argument,       NULL, 'v' },
 320                 { NULL },
 321         };
 322         int option_index, c;
 323
 324         for (;;) {
 325                 c = getopt_long(argc, argv, "a:b:c:dDf:ghi:nN:pPqs:vw:",
 326                                 long_options, &option_index);
 327                 if (c == -1)
 328                         break;
 329
 330                 switch (c) {
 331                 case 0:
 332                         switch (option_index) {
 333                         case 0:
 334                                 capture_comment = optarg;
 335                                 break;
 336                         default:
 337                                 usage();
 338                                 exit(1);
 339                         }
 340                         break;
 341                 case 'a':
 342                         auto_stop(optarg);
 343                         break;
 344                 case 'b':
 345                         rte_exit(EXIT_FAILURE,
 346                                  "multiple files not implemented\n");
 347                         break;
 348                 case 'c':
 349                         stop.packets = get_uint(optarg, "packet_count", 0);
 350                         break;
 351                 case 'd':
 352                         dump_bpf = true;
 353                         break;
 354                 case 'D':
 355                         show_interfaces();
 356                         exit(0);
 357                 case 'f':
 358                         filter_str = optarg;
 359                         break;
 360                 case 'g':
 361                         group_read = true;
 362                         break;
 363                 case 'h':
 364                         printf("%s\n\n", version());
 365                         usage();
 366                         exit(0);
 367                 case 'i':
 368                         select_interface(optarg);
 369                         break;
 370                 case 'n':
 371                         use_pcapng = true;
 372                         break;
 373                 case 'N':
 374                         ring_size = get_uint(optarg, "packet_limit", 0);
 375                         break;
 376                 case 'p':
 377                         promiscuous_mode = false;
 378                         break;
 379                 case 'P':
 380                         use_pcapng = false;
 381                         break;
 382                 case 'q':
 383                         quiet = true;
 384                         break;
 385                 case 's':
 386                         snaplen = get_uint(optarg, "snap_len", 0);
 387                         break;
 388                 case 'w':
 389                         output_name = optarg;
 390                         break;
 391                 case 'v':
 392                         printf("%s\n", version());
 393                         exit(0);
 394                 default:
 395                         fprintf(stderr, "Invalid option: %s\n",
 396                                 argv[optind - 1]);
 397                         usage();
 398                         exit(1);
 399                 }
 400         }
 401 }
 402
 403 static void
 404 signal_handler(int sig_num __rte_unused)
 405 {
 406         __atomic_store_n(&quit_signal, true, __ATOMIC_RELAXED);
 407 }
 408
 409 /* Return the time since 1/1/1970 in nanoseconds */
 410 static uint64_t create_timestamp(void)
 411 {
 412         struct timespec now;
 413
 414         clock_gettime(CLOCK_MONOTONIC, &now);
 415         return rte_timespec_to_ns(&now);
 416 }
 417
 418 static void
 419 cleanup_pdump_resources(void)
 420 {
 421         struct interface *intf;
 422
 423         TAILQ_FOREACH(intf, &interfaces, next) {
 424                 rte_pdump_disable(intf->port,
 425                                   RTE_PDUMP_ALL_QUEUES, RTE_PDUMP_FLAG_RXTX);
 426                 if (promiscuous_mode)
 427                         rte_eth_promiscuous_disable(intf->port);
 428         }
 429 }
 430
 431 /* Alarm signal handler, used to check that primary process */
 432 static void
 433 monitor_primary(void *arg __rte_unused)
 434 {
 435         if (__atomic_load_n(&quit_signal, __ATOMIC_RELAXED))
 436                 return;
 437
 438         if (rte_eal_primary_proc_alive(NULL)) {
 439                 rte_eal_alarm_set(MONITOR_INTERVAL, monitor_primary, NULL);
 440         } else {
 441                 fprintf(stderr,
 442                         "Primary process is no longer active, exiting...\n");
 443                 __atomic_store_n(&quit_signal, true, __ATOMIC_RELAXED);
 444         }
 445 }
 446
 447 /* Setup handler to check when primary exits. */
 448 static void
 449 enable_primary_monitor(void)
 450 {
 451         int ret;
 452
 453         /* Once primary exits, so will pdump. */
 454         ret = rte_eal_alarm_set(MONITOR_INTERVAL, monitor_primary, NULL);
 455         if (ret < 0)
 456                 fprintf(stderr, "Fail to enable monitor:%d\n", ret);
 457 }
 458
 459 static void
 460 disable_primary_monitor(void)
 461 {
 462         int ret;
 463
 464         ret = rte_eal_alarm_cancel(monitor_primary, NULL);
 465         if (ret < 0)
 466                 fprintf(stderr, "Fail to disable monitor:%d\n", ret);
 467 }
 468
 469 static void
 470 report_packet_stats(dumpcap_out_t out)
 471 {
 472         struct rte_pdump_stats pdump_stats;
 473         struct interface *intf;
 474         uint64_t ifrecv, ifdrop;
 475         double percent;
 476
 477         fputc('\n', stderr);
 478         TAILQ_FOREACH(intf, &interfaces, next) {
 479                 if (rte_pdump_stats(intf->port, &pdump_stats) < 0)
 480                         continue;
 481
 482                 /* do what Wiretap does */
 483                 ifrecv = pdump_stats.accepted + pdump_stats.filtered;
 484                 ifdrop = pdump_stats.nombuf + pdump_stats.ringfull;
 485
 486                 if (use_pcapng)
 487                         rte_pcapng_write_stats(out.pcapng, intf->port, NULL,
 488                                                start_time, end_time,
 489                                                ifrecv, ifdrop);
 490
 491                 if (ifrecv == 0)
 492                         percent = 0;
 493                 else
 494                         percent = 100. * ifrecv / (ifrecv + ifdrop);
 495
 496                 fprintf(stderr,
 497                         "Packets received/dropped on interface '%s': "
 498                         "%"PRIu64 "/%" PRIu64 " (%.1f)\n",
 499                         intf->name, ifrecv, ifdrop, percent);
 500         }
 501 }
 502
 503 /*
 504  * Start DPDK EAL with arguments.
 505  * Unlike most DPDK programs, this application does not use the
 506  * typical EAL command line arguments.
 507  * We don't want to expose all the DPDK internals to the user.
 508  */
 509 static void dpdk_init(void)
 510 {
 511         static const char * const args[] = {
 512                 "dumpcap", "--proc-type", "secondary",
 513                 "--log-level", "notice"
 514
 515         };
 516         const int eal_argc = RTE_DIM(args);
 517         char **eal_argv;
 518         unsigned int i;
 519
 520         /* DPDK API requires mutable versions of command line arguments. */
 521         eal_argv = calloc(eal_argc + 1, sizeof(char *));
 522         if (eal_argv == NULL)
 523                 rte_panic("No memory\n");
 524
 525         eal_argv[0] = strdup(progname);
 526         for (i = 1; i < RTE_DIM(args); i++)
 527                 eal_argv[i] = strdup(args[i]);
 528
 529         if (rte_eal_init(eal_argc, eal_argv) < 0)
 530                 rte_exit(EXIT_FAILURE, "EAL init failed: is primary process running?\n");
 531
 532         if (rte_eth_dev_count_avail() == 0)
 533                 rte_exit(EXIT_FAILURE, "No Ethernet ports found\n");
 534 }
 535
 536 /* Create packet ring shared between callbacks and process */
 537 static struct rte_ring *create_ring(void)
 538 {
 539         struct rte_ring *ring;
 540         size_t size, log2;
 541
 542         /* Find next power of 2 >= size. */
 543         size = ring_size;
 544         log2 = sizeof(size) * 8 - __builtin_clzl(size - 1);
 545         size = 1u << log2;
 546
 547         if (size != ring_size) {
 548                 fprintf(stderr, "Ring size %u rounded up to %zu\n",
 549                         ring_size, size);
 550                 ring_size = size;
 551         }
 552
 553         ring = rte_ring_lookup(RING_NAME);
 554         if (ring == NULL) {
 555                 ring = rte_ring_create(RING_NAME, ring_size,
 556                                         rte_socket_id(), 0);
 557                 if (ring == NULL)
 558                         rte_exit(EXIT_FAILURE, "Could not create ring :%s\n",
 559                                  rte_strerror(rte_errno));
 560         }
 561         return ring;
 562 }
 563
 564 static struct rte_mempool *create_mempool(void)
 565 {
 566         static const char pool_name[] = "capture_mbufs";
 567         size_t num_mbufs = 2 * ring_size;
 568         struct rte_mempool *mp;
 569
 570         mp = rte_mempool_lookup(pool_name);
 571         if (mp)
 572                 return mp;
 573
 574         mp = rte_pktmbuf_pool_create_by_ops(pool_name, num_mbufs,
 575                                             MBUF_POOL_CACHE_SIZE, 0,
 576                                             rte_pcapng_mbuf_size(snaplen),
 577                                             rte_socket_id(), "ring_mp_sc");
 578         if (mp == NULL)
 579                 rte_exit(EXIT_FAILURE,
 580                          "Mempool (%s) creation failed: %s\n", pool_name,
 581                          rte_strerror(rte_errno));
 582
 583         return mp;
 584 }
 585
 586 /*
 587  * Get Operating System information.
 588  * Returns an string allocated via malloc().
 589  */
 590 static char *get_os_info(void)
 591 {
 592         struct utsname uts;
 593         char *osname = NULL;
 594
 595         if (uname(&uts) < 0)
 596                 return NULL;
 597
 598         if (asprintf(&osname, "%s %s",
 599                      uts.sysname, uts.release) == -1)
 600                 return NULL;
 601
 602         return osname;
 603 }
 604
 605 static dumpcap_out_t create_output(void)
 606 {
 607         dumpcap_out_t ret;
 608         static char tmp_path[PATH_MAX];
 609         int fd;
 610
 611         /* If no filename specified make a tempfile name */
 612         if (output_name == NULL) {
 613                 struct interface *intf;
 614                 struct tm *tm;
 615                 time_t now;
 616                 char ts[32];
 617
 618                 intf = TAILQ_FIRST(&interfaces);
 619                 now = time(NULL);
 620                 tm = localtime(&now);
 621                 if (!tm)
 622                         rte_panic("localtime failed\n");
 623
 624                 strftime(ts, sizeof(ts), "%Y%m%d%H%M%S", tm);
 625
 626                 snprintf(tmp_path, sizeof(tmp_path),
 627                          "/tmp/%s_%u_%s_%s.%s",
 628                          progname, intf->port, intf->name, ts,
 629                          use_pcapng ? "pcapng" : "pcap");
 630                 output_name = tmp_path;
 631         }
 632
 633         if (strcmp(output_name, "-") == 0)
 634                 fd = STDOUT_FILENO;
 635         else {
 636                 mode_t mode = group_read ? 0640 : 0600;
 637
 638                 fd = open(output_name, O_WRONLY | O_CREAT, mode);
 639                 if (fd < 0)
 640                         rte_exit(EXIT_FAILURE, "Can not open \"%s\": %s\n",
 641                                  output_name, strerror(errno));
 642         }
 643
 644         if (use_pcapng) {
 645                 char *os = get_os_info();
 646
 647                 ret.pcapng = rte_pcapng_fdopen(fd, os, NULL,
 648                                            version(), capture_comment);
 649                 if (ret.pcapng == NULL)
 650                         rte_exit(EXIT_FAILURE, "pcapng_fdopen failed: %s\n",
 651                                  strerror(rte_errno));
 652                 free(os);
 653         } else {
 654                 pcap_t *pcap;
 655
 656                 pcap = pcap_open_dead_with_tstamp_precision(DLT_EN10MB, snaplen,
 657                                                             PCAP_TSTAMP_PRECISION_NANO);
 658                 if (pcap == NULL)
 659                         rte_exit(EXIT_FAILURE, "pcap_open_dead failed\n");
 660
 661                 ret.dumper = pcap_dump_fopen(pcap, fdopen(fd, "w"));
 662                 if (ret.dumper == NULL)
 663                         rte_exit(EXIT_FAILURE, "pcap_dump_fopen failed: %s\n",
 664                                  pcap_geterr(pcap));
 665         }
 666
 667         return ret;
 668 }
 669
 670 static void enable_pdump(struct rte_ring *r, struct rte_mempool *mp)
 671 {
 672         struct interface *intf;
 673         uint32_t flags;
 674         int ret;
 675
 676         flags = RTE_PDUMP_FLAG_RXTX;
 677         if (use_pcapng)
 678                 flags |= RTE_PDUMP_FLAG_PCAPNG;
 679
 680         TAILQ_FOREACH(intf, &interfaces, next) {
 681                 if (promiscuous_mode)
 682                         rte_eth_promiscuous_enable(intf->port);
 683
 684                 ret = rte_pdump_enable_bpf(intf->port, RTE_PDUMP_ALL_QUEUES,
 685                                            flags, snaplen,
 686                                            r, mp, bpf_prm);
 687                 if (ret < 0)
 688                         rte_exit(EXIT_FAILURE,
 689                                  "Packet dump enable failed: %s\n",
 690                                  rte_strerror(-ret));
 691         }
 692 }
 693
 694 /*
 695  * Show current count of captured packets
 696  * with backspaces to overwrite last value.
 697  */
 698 static void show_count(uint64_t count)
 699 {
 700         unsigned int i;
 701         static unsigned int bt;
 702
 703         for (i = 0; i < bt; i++)
 704                 fputc('\b', stderr);
 705
 706         bt = fprintf(stderr, "%"PRIu64" ", count);
 707 }
 708
 709 /* Write multiple packets in older pcap format */
 710 static ssize_t
 711 pcap_write_packets(pcap_dumper_t *dumper,
 712                    struct rte_mbuf *pkts[], uint16_t n)
 713 {
 714         uint8_t temp_data[snaplen];
 715         struct pcap_pkthdr header;
 716         uint16_t i;
 717         size_t total = 0;
 718
 719         gettimeofday(&header.ts, NULL);
 720
 721         for (i = 0; i < n; i++) {
 722                 struct rte_mbuf *m = pkts[i];
 723
 724                 header.len = rte_pktmbuf_pkt_len(m);
 725                 header.caplen = RTE_MIN(header.len, snaplen);
 726
 727                 pcap_dump((u_char *)dumper, &header,
 728                           rte_pktmbuf_read(m, 0, header.caplen, temp_data));
 729
 730                 total += sizeof(header) + header.len;
 731         }
 732
 733         return total;
 734 }
 735
 736 /* Process all packets in ring and dump to capture file */
 737 static int process_ring(dumpcap_out_t out, struct rte_ring *r)
 738 {
 739         struct rte_mbuf *pkts[BURST_SIZE];
 740         unsigned int avail, n;
 741         static unsigned int empty_count;
 742         ssize_t written;
 743
 744         n = rte_ring_sc_dequeue_burst(r, (void **) pkts, BURST_SIZE,
 745                                       &avail);
 746         if (n == 0) {
 747                 /* don't consume endless amounts of cpu if idle */
 748                 if (empty_count < SLEEP_THRESHOLD)
 749                         ++empty_count;
 750                 else
 751                         usleep(10);
 752                 return 0;
 753         }
 754
 755         empty_count = (avail == 0);
 756
 757         if (use_pcapng)
 758                 written = rte_pcapng_write_packets(out.pcapng, pkts, n);
 759         else
 760                 written = pcap_write_packets(out.dumper, pkts, n);
 761
 762         rte_pktmbuf_free_bulk(pkts, n);
 763
 764         if (written < 0)
 765                 return -1;
 766
 767         file_size += written;
 768         packets_received += n;
 769         if (!quiet)
 770                 show_count(packets_received);
 771
 772         return 0;
 773 }
 774
 775 int main(int argc, char **argv)
 776 {
 777         struct rte_ring *r;
 778         struct rte_mempool *mp;
 779         dumpcap_out_t out;
 780
 781         progname = argv[0];
 782
 783         dpdk_init();
 784         parse_opts(argc, argv);
 785
 786         if (filter_str)
 787                 compile_filter();
 788
 789         if (TAILQ_EMPTY(&interfaces))
 790                 set_default_interface();
 791
 792         r = create_ring();
 793         mp = create_mempool();
 794         out = create_output();
 795
 796         start_time = create_timestamp();
 797         enable_pdump(r, mp);
 798
 799         signal(SIGINT, signal_handler);
 800         signal(SIGPIPE, SIG_IGN);
 801
 802         enable_primary_monitor();
 803
 804         if (!quiet) {
 805                 fprintf(stderr, "Packets captured: ");
 806                 show_count(0);
 807         }
 808
 809         while (!__atomic_load_n(&quit_signal, __ATOMIC_RELAXED)) {
 810                 if (process_ring(out, r) < 0) {
 811                         fprintf(stderr, "pcapng file write failed; %s\n",
 812                                 strerror(errno));
 813                         break;
 814                 }
 815
 816                 if (stop.size && file_size >= stop.size)
 817                         break;
 818
 819                 if (stop.packets && packets_received >= stop.packets)
 820                         break;
 821
 822                 if (stop.duration != 0 &&
 823                     create_timestamp() - start_time > stop.duration)
 824                         break;
 825         }
 826
 827         end_time = create_timestamp();
 828         disable_primary_monitor();
 829
 830         if (rte_eal_primary_proc_alive(NULL))
 831                 report_packet_stats(out);
 832
 833         if (use_pcapng)
 834                 rte_pcapng_close(out.pcapng);
 835         else
 836                 pcap_dump_close(out.dumper);
 837
 838         cleanup_pdump_resources();
 839         rte_free(bpf_filter);
 840         rte_ring_free(r);
 841         rte_mempool_free(mp);
 842
 843         return rte_eal_cleanup() ? EXIT_FAILURE : 0;
 844 }