Documentation/networking/timestamping/txtimestamp.c

   1 /*
   2  * Copyright 2014 Google Inc.
   3  * Author: willemb@google.com (Willem de Bruijn)
   4  *
   5  * Test software tx timestamping, including
   6  *
   7  * - SCHED, SND and ACK timestamps
   8  * - RAW, UDP and TCP
   9  * - IPv4 and IPv6
  10  * - various packet sizes (to test GSO and TSO)
  11  *
  12  * Consult the command line arguments for help on running
  13  * the various testcases.
  14  *
  15  * This test requires a dummy TCP server.
  16  * A simple `nc6 [-u] -l -p $DESTPORT` will do
  17  *
  18  *
  19  * This program is free software; you can redistribute it and/or modify it
  20  * under the terms and conditions of the GNU General Public License,
  21  * version 2, as published by the Free Software Foundation.
  22  *
  23  * This program is distributed in the hope it will be useful, but WITHOUT
  24  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  25  * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
  26  * more details.
  27  *
  28  * You should have received a copy of the GNU General Public License along with
  29  * this program; if not, write to the Free Software Foundation, Inc.,
  30  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  31  */
  32
  33 #define _GNU_SOURCE
  34
  35 #include <arpa/inet.h>
  36 #include <asm/types.h>
  37 #include <error.h>
  38 #include <errno.h>
  39 #include <linux/errqueue.h>
  40 #include <linux/if_ether.h>
  41 #include <linux/net_tstamp.h>
  42 #include <netdb.h>
  43 #include <net/if.h>
  44 #include <netinet/in.h>
  45 #include <netinet/ip.h>
  46 #include <netinet/udp.h>
  47 #include <netinet/tcp.h>
  48 #include <netpacket/packet.h>
  49 #include <poll.h>
  50 #include <stdarg.h>
  51 #include <stdbool.h>
  52 #include <stdint.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <sys/ioctl.h>
  57 #include <sys/select.h>
  58 #include <sys/socket.h>
  59 #include <sys/time.h>
  60 #include <sys/types.h>
  61 #include <time.h>
  62 #include <unistd.h>
  63
  64 /* command line parameters */
  65 static int cfg_proto = SOCK_STREAM;
  66 static int cfg_ipproto = IPPROTO_TCP;
  67 static int cfg_num_pkts = 4;
  68 static int do_ipv4 = 1;
  69 static int do_ipv6 = 1;
  70 static int cfg_payload_len = 10;
  71 static bool cfg_show_payload;
  72 static bool cfg_do_pktinfo;
  73 static bool cfg_loop_nodata;
  74 static uint16_t dest_port = 9000;
  75
  76 static struct sockaddr_in daddr;
  77 static struct sockaddr_in6 daddr6;
  78 static struct timespec ts_prev;
  79
  80 static void __print_timestamp(const char *name, struct timespec *cur,
  81                               uint32_t key, int payload_len)
  82 {
  83         if (!(cur->tv_sec | cur->tv_nsec))
  84                 return;
  85
  86         fprintf(stderr, "  %s: %lu s %lu us (seq=%u, len=%u)",
  87                         name, cur->tv_sec, cur->tv_nsec / 1000,
  88                         key, payload_len);
  89
  90         if ((ts_prev.tv_sec | ts_prev.tv_nsec)) {
  91                 int64_t cur_ms, prev_ms;
  92
  93                 cur_ms = (long) cur->tv_sec * 1000 * 1000;
  94                 cur_ms += cur->tv_nsec / 1000;
  95
  96                 prev_ms = (long) ts_prev.tv_sec * 1000 * 1000;
  97                 prev_ms += ts_prev.tv_nsec / 1000;
  98
  99                 fprintf(stderr, "  (%+ld us)", cur_ms - prev_ms);
 100         }
 101
 102         ts_prev = *cur;
 103         fprintf(stderr, "\n");
 104 }
 105
 106 static void print_timestamp_usr(void)
 107 {
 108         struct timespec ts;
 109         struct timeval tv;      /* avoid dependency on -lrt */
 110
 111         gettimeofday(&tv, NULL);
 112         ts.tv_sec = tv.tv_sec;
 113         ts.tv_nsec = tv.tv_usec * 1000;
 114
 115         __print_timestamp("  USR", &ts, 0, 0);
 116 }
 117
 118 static void print_timestamp(struct scm_timestamping *tss, int tstype,
 119                             int tskey, int payload_len)
 120 {
 121         const char *tsname;
 122
 123         switch (tstype) {
 124         case SCM_TSTAMP_SCHED:
 125                 tsname = "  ENQ";
 126                 break;
 127         case SCM_TSTAMP_SND:
 128                 tsname = "  SND";
 129                 break;
 130         case SCM_TSTAMP_ACK:
 131                 tsname = "  ACK";
 132                 break;
 133         default:
 134                 error(1, 0, "unknown timestamp type: %u",
 135                 tstype);
 136         }
 137         __print_timestamp(tsname, &tss->ts[0], tskey, payload_len);
 138 }
 139
 140 /* TODO: convert to check_and_print payload once API is stable */
 141 static void print_payload(char *data, int len)
 142 {
 143         int i;
 144
 145         if (!len)
 146                 return;
 147
 148         if (len > 70)
 149                 len = 70;
 150
 151         fprintf(stderr, "payload: ");
 152         for (i = 0; i < len; i++)
 153                 fprintf(stderr, "%02hhx ", data[i]);
 154         fprintf(stderr, "\n");
 155 }
 156
 157 static void print_pktinfo(int family, int ifindex, void *saddr, void *daddr)
 158 {
 159         char sa[INET6_ADDRSTRLEN], da[INET6_ADDRSTRLEN];
 160
 161         fprintf(stderr, "         pktinfo: ifindex=%u src=%s dst=%s\n",
 162                 ifindex,
 163                 saddr ? inet_ntop(family, saddr, sa, sizeof(sa)) : "unknown",
 164                 daddr ? inet_ntop(family, daddr, da, sizeof(da)) : "unknown");
 165 }
 166
 167 static void __poll(int fd)
 168 {
 169         struct pollfd pollfd;
 170         int ret;
 171
 172         memset(&pollfd, 0, sizeof(pollfd));
 173         pollfd.fd = fd;
 174         ret = poll(&pollfd, 1, 100);
 175         if (ret != 1)
 176                 error(1, errno, "poll");
 177 }
 178
 179 static void __recv_errmsg_cmsg(struct msghdr *msg, int payload_len)
 180 {
 181         struct sock_extended_err *serr = NULL;
 182         struct scm_timestamping *tss = NULL;
 183         struct cmsghdr *cm;
 184         int batch = 0;
 185
 186         for (cm = CMSG_FIRSTHDR(msg);
 187              cm && cm->cmsg_len;
 188              cm = CMSG_NXTHDR(msg, cm)) {
 189                 if (cm->cmsg_level == SOL_SOCKET &&
 190                     cm->cmsg_type == SCM_TIMESTAMPING) {
 191                         tss = (void *) CMSG_DATA(cm);
 192                 } else if ((cm->cmsg_level == SOL_IP &&
 193                             cm->cmsg_type == IP_RECVERR) ||
 194                            (cm->cmsg_level == SOL_IPV6 &&
 195                             cm->cmsg_type == IPV6_RECVERR)) {
 196                         serr = (void *) CMSG_DATA(cm);
 197                         if (serr->ee_errno != ENOMSG ||
 198                             serr->ee_origin != SO_EE_ORIGIN_TIMESTAMPING) {
 199                                 fprintf(stderr, "unknown ip error %d %d\n",
 200                                                 serr->ee_errno,
 201                                                 serr->ee_origin);
 202                                 serr = NULL;
 203                         }
 204                 } else if (cm->cmsg_level == SOL_IP &&
 205                            cm->cmsg_type == IP_PKTINFO) {
 206                         struct in_pktinfo *info = (void *) CMSG_DATA(cm);
 207                         print_pktinfo(AF_INET, info->ipi_ifindex,
 208                                       &info->ipi_spec_dst, &info->ipi_addr);
 209                 } else if (cm->cmsg_level == SOL_IPV6 &&
 210                            cm->cmsg_type == IPV6_PKTINFO) {
 211                         struct in6_pktinfo *info6 = (void *) CMSG_DATA(cm);
 212                         print_pktinfo(AF_INET6, info6->ipi6_ifindex,
 213                                       NULL, &info6->ipi6_addr);
 214                 } else
 215                         fprintf(stderr, "unknown cmsg %d,%d\n",
 216                                         cm->cmsg_level, cm->cmsg_type);
 217
 218                 if (serr && tss) {
 219                         print_timestamp(tss, serr->ee_info, serr->ee_data,
 220                                         payload_len);
 221                         serr = NULL;
 222                         tss = NULL;
 223                         batch++;
 224                 }
 225         }
 226
 227         if (batch > 1)
 228                 fprintf(stderr, "batched %d timestamps\n", batch);
 229 }
 230
 231 static int recv_errmsg(int fd)
 232 {
 233         static char ctrl[1024 /* overprovision*/];
 234         static struct msghdr msg;
 235         struct iovec entry;
 236         static char *data;
 237         int ret = 0;
 238
 239         data = malloc(cfg_payload_len);
 240         if (!data)
 241                 error(1, 0, "malloc");
 242
 243         memset(&msg, 0, sizeof(msg));
 244         memset(&entry, 0, sizeof(entry));
 245         memset(ctrl, 0, sizeof(ctrl));
 246
 247         entry.iov_base = data;
 248         entry.iov_len = cfg_payload_len;
 249         msg.msg_iov = &entry;
 250         msg.msg_iovlen = 1;
 251         msg.msg_name = NULL;
 252         msg.msg_namelen = 0;
 253         msg.msg_control = ctrl;
 254         msg.msg_controllen = sizeof(ctrl);
 255
 256         ret = recvmsg(fd, &msg, MSG_ERRQUEUE);
 257         if (ret == -1 && errno != EAGAIN)
 258                 error(1, errno, "recvmsg");
 259
 260         if (ret >= 0) {
 261                 __recv_errmsg_cmsg(&msg, ret);
 262                 if (cfg_show_payload)
 263                         print_payload(data, cfg_payload_len);
 264         }
 265
 266         free(data);
 267         return ret == -1;
 268 }
 269
 270 static void do_test(int family, unsigned int opt)
 271 {
 272         char *buf;
 273         int fd, i, val = 1, total_len;
 274
 275         if (family == AF_INET6 && cfg_proto != SOCK_STREAM) {
 276                 /* due to lack of checksum generation code */
 277                 fprintf(stderr, "test: skipping datagram over IPv6\n");
 278                 return;
 279         }
 280
 281         total_len = cfg_payload_len;
 282         if (cfg_proto == SOCK_RAW) {
 283                 total_len += sizeof(struct udphdr);
 284                 if (cfg_ipproto == IPPROTO_RAW)
 285                         total_len += sizeof(struct iphdr);
 286         }
 287
 288         buf = malloc(total_len);
 289         if (!buf)
 290                 error(1, 0, "malloc");
 291
 292         fd = socket(family, cfg_proto, cfg_ipproto);
 293         if (fd < 0)
 294                 error(1, errno, "socket");
 295
 296         if (cfg_proto == SOCK_STREAM) {
 297                 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY,
 298                                (char*) &val, sizeof(val)))
 299                         error(1, 0, "setsockopt no nagle");
 300
 301                 if (family == PF_INET) {
 302                         if (connect(fd, (void *) &daddr, sizeof(daddr)))
 303                                 error(1, errno, "connect ipv4");
 304                 } else {
 305                         if (connect(fd, (void *) &daddr6, sizeof(daddr6)))
 306                                 error(1, errno, "connect ipv6");
 307                 }
 308         }
 309
 310         if (cfg_do_pktinfo) {
 311                 if (family == AF_INET6) {
 312                         if (setsockopt(fd, SOL_IPV6, IPV6_RECVPKTINFO,
 313                                        &val, sizeof(val)))
 314                                 error(1, errno, "setsockopt pktinfo ipv6");
 315                 } else {
 316                         if (setsockopt(fd, SOL_IP, IP_PKTINFO,
 317                                        &val, sizeof(val)))
 318                                 error(1, errno, "setsockopt pktinfo ipv4");
 319                 }
 320         }
 321
 322         opt |= SOF_TIMESTAMPING_SOFTWARE |
 323                SOF_TIMESTAMPING_OPT_CMSG |
 324                SOF_TIMESTAMPING_OPT_ID;
 325         if (cfg_loop_nodata)
 326                 opt |= SOF_TIMESTAMPING_OPT_TSONLY;
 327
 328         if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING,
 329                        (char *) &opt, sizeof(opt)))
 330                 error(1, 0, "setsockopt timestamping");
 331
 332         for (i = 0; i < cfg_num_pkts; i++) {
 333                 memset(&ts_prev, 0, sizeof(ts_prev));
 334                 memset(buf, 'a' + i, total_len);
 335
 336                 if (cfg_proto == SOCK_RAW) {
 337                         struct udphdr *udph;
 338                         int off = 0;
 339
 340                         if (cfg_ipproto == IPPROTO_RAW) {
 341                                 struct iphdr *iph = (void *) buf;
 342
 343                                 memset(iph, 0, sizeof(*iph));
 344                                 iph->ihl      = 5;
 345                                 iph->version  = 4;
 346                                 iph->ttl      = 2;
 347                                 iph->daddr    = daddr.sin_addr.s_addr;
 348                                 iph->protocol = IPPROTO_UDP;
 349                                 /* kernel writes saddr, csum, len */
 350
 351                                 off = sizeof(*iph);
 352                         }
 353
 354                         udph = (void *) buf + off;
 355                         udph->source = ntohs(9000);     /* random spoof */
 356                         udph->dest   = ntohs(dest_port);
 357                         udph->len    = ntohs(sizeof(*udph) + cfg_payload_len);
 358                         udph->check  = 0;       /* not allowed for IPv6 */
 359                 }
 360
 361                 print_timestamp_usr();
 362                 if (cfg_proto != SOCK_STREAM) {
 363                         if (family == PF_INET)
 364                                 val = sendto(fd, buf, total_len, 0, (void *) &daddr, sizeof(daddr));
 365                         else
 366                                 val = sendto(fd, buf, total_len, 0, (void *) &daddr6, sizeof(daddr6));
 367                 } else {
 368                         val = send(fd, buf, cfg_payload_len, 0);
 369                 }
 370                 if (val != total_len)
 371                         error(1, errno, "send");
 372
 373                 /* wait for all errors to be queued, else ACKs arrive OOO */
 374                 usleep(50 * 1000);
 375
 376                 __poll(fd);
 377
 378                 while (!recv_errmsg(fd)) {}
 379         }
 380
 381         if (close(fd))
 382                 error(1, errno, "close");
 383
 384         free(buf);
 385         usleep(400 * 1000);
 386 }
 387
 388 static void __attribute__((noreturn)) usage(const char *filepath)
 389 {
 390         fprintf(stderr, "\nUsage: %s [options] hostname\n"
 391                         "\nwhere options are:\n"
 392                         "  -4:   only IPv4\n"
 393                         "  -6:   only IPv6\n"
 394                         "  -h:   show this message\n"
 395                         "  -I:   request PKTINFO\n"
 396                         "  -l N: send N bytes at a time\n"
 397                         "  -n:   set no-payload option\n"
 398                         "  -r:   use raw\n"
 399                         "  -R:   use raw (IP_HDRINCL)\n"
 400                         "  -p N: connect to port N\n"
 401                         "  -u:   use udp\n"
 402                         "  -x:   show payload (up to 70 bytes)\n",
 403                         filepath);
 404         exit(1);
 405 }
 406
 407 static void parse_opt(int argc, char **argv)
 408 {
 409         int proto_count = 0;
 410         char c;
 411
 412         while ((c = getopt(argc, argv, "46hIl:np:rRux")) != -1) {
 413                 switch (c) {
 414                 case '4':
 415                         do_ipv6 = 0;
 416                         break;
 417                 case '6':
 418                         do_ipv4 = 0;
 419                         break;
 420                 case 'I':
 421                         cfg_do_pktinfo = true;
 422                         break;
 423                 case 'n':
 424                         cfg_loop_nodata = true;
 425                         break;
 426                 case 'r':
 427                         proto_count++;
 428                         cfg_proto = SOCK_RAW;
 429                         cfg_ipproto = IPPROTO_UDP;
 430                         break;
 431                 case 'R':
 432                         proto_count++;
 433                         cfg_proto = SOCK_RAW;
 434                         cfg_ipproto = IPPROTO_RAW;
 435                         break;
 436                 case 'u':
 437                         proto_count++;
 438                         cfg_proto = SOCK_DGRAM;
 439                         cfg_ipproto = IPPROTO_UDP;
 440                         break;
 441                 case 'l':
 442                         cfg_payload_len = strtoul(optarg, NULL, 10);
 443                         break;
 444                 case 'p':
 445                         dest_port = strtoul(optarg, NULL, 10);
 446                         break;
 447                 case 'x':
 448                         cfg_show_payload = true;
 449                         break;
 450                 case 'h':
 451                 default:
 452                         usage(argv[0]);
 453                 }
 454         }
 455
 456         if (!cfg_payload_len)
 457                 error(1, 0, "payload may not be nonzero");
 458         if (cfg_proto != SOCK_STREAM && cfg_payload_len > 1472)
 459                 error(1, 0, "udp packet might exceed expected MTU");
 460         if (!do_ipv4 && !do_ipv6)
 461                 error(1, 0, "pass -4 or -6, not both");
 462         if (proto_count > 1)
 463                 error(1, 0, "pass -r, -R or -u, not multiple");
 464
 465         if (optind != argc - 1)
 466                 error(1, 0, "missing required hostname argument");
 467 }
 468
 469 static void resolve_hostname(const char *hostname)
 470 {
 471         struct addrinfo *addrs, *cur;
 472         int have_ipv4 = 0, have_ipv6 = 0;
 473
 474         if (getaddrinfo(hostname, NULL, NULL, &addrs))
 475                 error(1, errno, "getaddrinfo");
 476
 477         cur = addrs;
 478         while (cur && !have_ipv4 && !have_ipv6) {
 479                 if (!have_ipv4 && cur->ai_family == AF_INET) {
 480                         memcpy(&daddr, cur->ai_addr, sizeof(daddr));
 481                         daddr.sin_port = htons(dest_port);
 482                         have_ipv4 = 1;
 483                 }
 484                 else if (!have_ipv6 && cur->ai_family == AF_INET6) {
 485                         memcpy(&daddr6, cur->ai_addr, sizeof(daddr6));
 486                         daddr6.sin6_port = htons(dest_port);
 487                         have_ipv6 = 1;
 488                 }
 489                 cur = cur->ai_next;
 490         }
 491         if (addrs)
 492                 freeaddrinfo(addrs);
 493
 494         do_ipv4 &= have_ipv4;
 495         do_ipv6 &= have_ipv6;
 496 }
 497
 498 static void do_main(int family)
 499 {
 500         fprintf(stderr, "family:       %s\n",
 501                         family == PF_INET ? "INET" : "INET6");
 502
 503         fprintf(stderr, "test SND\n");
 504         do_test(family, SOF_TIMESTAMPING_TX_SOFTWARE);
 505
 506         fprintf(stderr, "test ENQ\n");
 507         do_test(family, SOF_TIMESTAMPING_TX_SCHED);
 508
 509         fprintf(stderr, "test ENQ + SND\n");
 510         do_test(family, SOF_TIMESTAMPING_TX_SCHED |
 511                         SOF_TIMESTAMPING_TX_SOFTWARE);
 512
 513         if (cfg_proto == SOCK_STREAM) {
 514                 fprintf(stderr, "\ntest ACK\n");
 515                 do_test(family, SOF_TIMESTAMPING_TX_ACK);
 516
 517                 fprintf(stderr, "\ntest SND + ACK\n");
 518                 do_test(family, SOF_TIMESTAMPING_TX_SOFTWARE |
 519                                 SOF_TIMESTAMPING_TX_ACK);
 520
 521                 fprintf(stderr, "\ntest ENQ + SND + ACK\n");
 522                 do_test(family, SOF_TIMESTAMPING_TX_SCHED |
 523                                 SOF_TIMESTAMPING_TX_SOFTWARE |
 524                                 SOF_TIMESTAMPING_TX_ACK);
 525         }
 526 }
 527
 528 const char *sock_names[] = { NULL, "TCP", "UDP", "RAW" };
 529
 530 int main(int argc, char **argv)
 531 {
 532         if (argc == 1)
 533                 usage(argv[0]);
 534
 535         parse_opt(argc, argv);
 536         resolve_hostname(argv[argc - 1]);
 537
 538         fprintf(stderr, "protocol:     %s\n", sock_names[cfg_proto]);
 539         fprintf(stderr, "payload:      %u\n", cfg_payload_len);
 540         fprintf(stderr, "server port:  %u\n", dest_port);
 541         fprintf(stderr, "\n");
 542
 543         if (do_ipv4)
 544                 do_main(PF_INET);
 545         if (do_ipv6)
 546                 do_main(PF_INET6);
 547
 548         return 0;
 549 }