1 // SPDX-License-Identifier: GPL-2.0-or-later 2 #include <errno.h> 3 #include <error.h> 4 #include <netdb.h> 5 #include <stdbool.h> 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include <string.h> 9 #include <time.h> 10 #include <unistd.h> 11 #include <linux/errqueue.h> 12 #include <linux/icmp.h> 13 #include <linux/icmpv6.h> 14 #include <linux/net_tstamp.h> 15 #include <linux/types.h> 16 #include <linux/udp.h> 17 #include <sys/socket.h> 18 19 #include "../kselftest.h" 20 21 enum { 22 ERN_SUCCESS = 0, 23 /* Well defined errors, callers may depend on these */ 24 ERN_SEND = 1, 25 /* Informational, can reorder */ 26 ERN_HELP, 27 ERN_SEND_SHORT, 28 ERN_SOCK_CREATE, 29 ERN_RESOLVE, 30 ERN_CMSG_WR, 31 ERN_SOCKOPT, 32 ERN_GETTIME, 33 ERN_RECVERR, 34 ERN_CMSG_RD, 35 ERN_CMSG_RCV, 36 }; 37 38 struct option_cmsg_u32 { 39 bool ena; 40 unsigned int val; 41 }; 42 43 struct options { 44 bool silent_send; 45 const char *host; 46 const char *service; 47 unsigned int size; 48 unsigned int num_pkt; 49 struct { 50 unsigned int mark; 51 unsigned int dontfrag; 52 unsigned int tclass; 53 unsigned int hlimit; 54 unsigned int priority; 55 } sockopt; 56 struct { 57 unsigned int family; 58 unsigned int type; 59 unsigned int proto; 60 } sock; 61 struct option_cmsg_u32 mark; 62 struct option_cmsg_u32 priority; 63 struct { 64 bool ena; 65 unsigned int delay; 66 } txtime; 67 struct { 68 bool ena; 69 } ts; 70 struct { 71 struct option_cmsg_u32 dontfrag; 72 struct option_cmsg_u32 tclass; 73 struct option_cmsg_u32 hlimit; 74 struct option_cmsg_u32 exthdr; 75 } v6; 76 } opt = { 77 .size = 13, 78 .num_pkt = 1, 79 .sock = { 80 .family = AF_UNSPEC, 81 .type = SOCK_DGRAM, 82 .proto = IPPROTO_UDP, 83 }, 84 }; 85 86 static struct timespec time_start_real; 87 static struct timespec time_start_mono; 88 89 static void __attribute__((noreturn)) cs_usage(const char *bin) 90 { 91 printf("Usage: %s [opts] <dst host> <dst port / service>\n", bin); 92 printf("Options:\n" 93 "\t\t-s Silent send() failures\n" 94 "\t\t-S send() size\n" 95 "\t\t-4/-6 Force IPv4 / IPv6 only\n" 96 "\t\t-p prot Socket protocol\n" 97 "\t\t (u = UDP (default); i = ICMP; r = RAW)\n" 98 "\n" 99 "\t\t-m val Set SO_MARK with given value\n" 100 "\t\t-M val Set SO_MARK via setsockopt\n" 101 "\t\t-P val Set SO_PRIORITY via setsockopt\n" 102 "\t\t-Q val Set SO_PRIORITY via cmsg\n" 103 "\t\t-d val Set SO_TXTIME with given delay (usec)\n" 104 "\t\t-t Enable time stamp reporting\n" 105 "\t\t-f val Set don't fragment via cmsg\n" 106 "\t\t-F val Set don't fragment via setsockopt\n" 107 "\t\t-c val Set TCLASS via cmsg\n" 108 "\t\t-C val Set TCLASS via setsockopt\n" 109 "\t\t-l val Set HOPLIMIT via cmsg\n" 110 "\t\t-L val Set HOPLIMIT via setsockopt\n" 111 "\t\t-H type Add an IPv6 header option\n" 112 "\t\t (h = HOP; d = DST; r = RTDST)" 113 ""); 114 exit(ERN_HELP); 115 } 116 117 static void cs_parse_args(int argc, char *argv[]) 118 { 119 int o; 120 121 while ((o = getopt(argc, argv, "46sS:p:P:m:M:n:d:tf:F:c:C:l:L:H:Q:")) != -1) { 122 switch (o) { 123 case 's': 124 opt.silent_send = true; 125 break; 126 case 'S': 127 opt.size = atoi(optarg); 128 break; 129 case '4': 130 opt.sock.family = AF_INET; 131 break; 132 case '6': 133 opt.sock.family = AF_INET6; 134 break; 135 case 'p': 136 if (*optarg == 'u' || *optarg == 'U') { 137 opt.sock.proto = IPPROTO_UDP; 138 } else if (*optarg == 'i' || *optarg == 'I') { 139 opt.sock.proto = IPPROTO_ICMP; 140 } else if (*optarg == 'r') { 141 opt.sock.type = SOCK_RAW; 142 } else { 143 printf("Error: unknown protocol: %s\n", optarg); 144 cs_usage(argv[0]); 145 } 146 break; 147 case 'P': 148 opt.sockopt.priority = atoi(optarg); 149 break; 150 case 'm': 151 opt.mark.ena = true; 152 opt.mark.val = atoi(optarg); 153 break; 154 case 'Q': 155 opt.priority.ena = true; 156 opt.priority.val = atoi(optarg); 157 break; 158 case 'M': 159 opt.sockopt.mark = atoi(optarg); 160 break; 161 case 'n': 162 opt.num_pkt = atoi(optarg); 163 break; 164 case 'd': 165 opt.txtime.ena = true; 166 opt.txtime.delay = atoi(optarg); 167 break; 168 case 't': 169 opt.ts.ena = true; 170 break; 171 case 'f': 172 opt.v6.dontfrag.ena = true; 173 opt.v6.dontfrag.val = atoi(optarg); 174 break; 175 case 'F': 176 opt.sockopt.dontfrag = atoi(optarg); 177 break; 178 case 'c': 179 opt.v6.tclass.ena = true; 180 opt.v6.tclass.val = atoi(optarg); 181 break; 182 case 'C': 183 opt.sockopt.tclass = atoi(optarg); 184 break; 185 case 'l': 186 opt.v6.hlimit.ena = true; 187 opt.v6.hlimit.val = atoi(optarg); 188 break; 189 case 'L': 190 opt.sockopt.hlimit = atoi(optarg); 191 break; 192 case 'H': 193 opt.v6.exthdr.ena = true; 194 switch (optarg[0]) { 195 case 'h': 196 opt.v6.exthdr.val = IPV6_HOPOPTS; 197 break; 198 case 'd': 199 opt.v6.exthdr.val = IPV6_DSTOPTS; 200 break; 201 case 'r': 202 opt.v6.exthdr.val = IPV6_RTHDRDSTOPTS; 203 break; 204 default: 205 printf("Error: hdr type: %s\n", optarg); 206 break; 207 } 208 break; 209 } 210 } 211 212 if (optind != argc - 2) 213 cs_usage(argv[0]); 214 215 opt.host = argv[optind]; 216 opt.service = argv[optind + 1]; 217 } 218 219 static void memrnd(void *s, size_t n) 220 { 221 int *dword = s; 222 char *byte; 223 224 for (; n >= 4; n -= 4) 225 *dword++ = rand(); 226 byte = (void *)dword; 227 while (n--) 228 *byte++ = rand(); 229 } 230 231 static void 232 ca_write_cmsg_u32(char *cbuf, size_t cbuf_sz, size_t *cmsg_len, 233 int level, int optname, struct option_cmsg_u32 *uopt) 234 { 235 struct cmsghdr *cmsg; 236 237 if (!uopt->ena) 238 return; 239 240 cmsg = (struct cmsghdr *)(cbuf + *cmsg_len); 241 *cmsg_len += CMSG_SPACE(sizeof(__u32)); 242 if (cbuf_sz < *cmsg_len) 243 error(ERN_CMSG_WR, EFAULT, "cmsg buffer too small"); 244 245 cmsg->cmsg_level = level; 246 cmsg->cmsg_type = optname; 247 cmsg->cmsg_len = CMSG_LEN(sizeof(__u32)); 248 *(__u32 *)CMSG_DATA(cmsg) = uopt->val; 249 } 250 251 static void 252 cs_write_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz) 253 { 254 struct cmsghdr *cmsg; 255 size_t cmsg_len; 256 257 msg->msg_control = cbuf; 258 cmsg_len = 0; 259 260 ca_write_cmsg_u32(cbuf, cbuf_sz, &cmsg_len, 261 SOL_SOCKET, SO_MARK, &opt.mark); 262 ca_write_cmsg_u32(cbuf, cbuf_sz, &cmsg_len, 263 SOL_SOCKET, SO_PRIORITY, &opt.priority); 264 ca_write_cmsg_u32(cbuf, cbuf_sz, &cmsg_len, 265 SOL_IPV6, IPV6_DONTFRAG, &opt.v6.dontfrag); 266 ca_write_cmsg_u32(cbuf, cbuf_sz, &cmsg_len, 267 SOL_IPV6, IPV6_TCLASS, &opt.v6.tclass); 268 ca_write_cmsg_u32(cbuf, cbuf_sz, &cmsg_len, 269 SOL_IPV6, IPV6_HOPLIMIT, &opt.v6.hlimit); 270 271 if (opt.txtime.ena) { 272 __u64 txtime; 273 274 txtime = time_start_mono.tv_sec * (1000ULL * 1000 * 1000) + 275 time_start_mono.tv_nsec + 276 opt.txtime.delay * 1000; 277 278 cmsg = (struct cmsghdr *)(cbuf + cmsg_len); 279 cmsg_len += CMSG_SPACE(sizeof(txtime)); 280 if (cbuf_sz < cmsg_len) 281 error(ERN_CMSG_WR, EFAULT, "cmsg buffer too small"); 282 283 cmsg->cmsg_level = SOL_SOCKET; 284 cmsg->cmsg_type = SCM_TXTIME; 285 cmsg->cmsg_len = CMSG_LEN(sizeof(txtime)); 286 memcpy(CMSG_DATA(cmsg), &txtime, sizeof(txtime)); 287 } 288 if (opt.ts.ena) { 289 cmsg = (struct cmsghdr *)(cbuf + cmsg_len); 290 cmsg_len += CMSG_SPACE(sizeof(__u32)); 291 if (cbuf_sz < cmsg_len) 292 error(ERN_CMSG_WR, EFAULT, "cmsg buffer too small"); 293 294 cmsg->cmsg_level = SOL_SOCKET; 295 cmsg->cmsg_type = SO_TIMESTAMPING; 296 cmsg->cmsg_len = CMSG_LEN(sizeof(__u32)); 297 *(__u32 *)CMSG_DATA(cmsg) = SOF_TIMESTAMPING_TX_SCHED | 298 SOF_TIMESTAMPING_TX_SOFTWARE; 299 } 300 if (opt.v6.exthdr.ena) { 301 cmsg = (struct cmsghdr *)(cbuf + cmsg_len); 302 cmsg_len += CMSG_SPACE(8); 303 if (cbuf_sz < cmsg_len) 304 error(ERN_CMSG_WR, EFAULT, "cmsg buffer too small"); 305 306 cmsg->cmsg_level = SOL_IPV6; 307 cmsg->cmsg_type = opt.v6.exthdr.val; 308 cmsg->cmsg_len = CMSG_LEN(8); 309 *(__u64 *)CMSG_DATA(cmsg) = 0; 310 } 311 312 if (cmsg_len) 313 msg->msg_controllen = cmsg_len; 314 else 315 msg->msg_control = NULL; 316 } 317 318 static const char *cs_ts_info2str(unsigned int info) 319 { 320 static const char *names[] = { 321 [SCM_TSTAMP_SND] = "SND", 322 [SCM_TSTAMP_SCHED] = "SCHED", 323 [SCM_TSTAMP_ACK] = "ACK", 324 }; 325 326 if (info < ARRAY_SIZE(names)) 327 return names[info]; 328 return "unknown"; 329 } 330 331 static unsigned long 332 cs_read_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz) 333 { 334 struct sock_extended_err *see; 335 struct scm_timestamping *ts; 336 unsigned long ts_seen = 0; 337 struct cmsghdr *cmsg; 338 int i, err; 339 340 if (!opt.ts.ena) 341 return 0; 342 msg->msg_control = cbuf; 343 msg->msg_controllen = cbuf_sz; 344 345 while (true) { 346 ts = NULL; 347 see = NULL; 348 memset(cbuf, 0, cbuf_sz); 349 350 err = recvmsg(fd, msg, MSG_ERRQUEUE); 351 if (err < 0) { 352 if (errno == EAGAIN) 353 break; 354 error(ERN_RECVERR, errno, "recvmsg ERRQ"); 355 } 356 357 for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; 358 cmsg = CMSG_NXTHDR(msg, cmsg)) { 359 if (cmsg->cmsg_level == SOL_SOCKET && 360 cmsg->cmsg_type == SO_TIMESTAMPING_OLD) { 361 if (cmsg->cmsg_len < sizeof(*ts)) 362 error(ERN_CMSG_RD, EINVAL, "TS cmsg"); 363 364 ts = (void *)CMSG_DATA(cmsg); 365 } 366 if ((cmsg->cmsg_level == SOL_IP && 367 cmsg->cmsg_type == IP_RECVERR) || 368 (cmsg->cmsg_level == SOL_IPV6 && 369 cmsg->cmsg_type == IPV6_RECVERR)) { 370 if (cmsg->cmsg_len < sizeof(*see)) 371 error(ERN_CMSG_RD, EINVAL, "sock_err cmsg"); 372 373 see = (void *)CMSG_DATA(cmsg); 374 } 375 } 376 377 if (!ts) 378 error(ERN_CMSG_RCV, ENOENT, "TS cmsg not found"); 379 if (!see) 380 error(ERN_CMSG_RCV, ENOENT, "sock_err cmsg not found"); 381 382 for (i = 0; i < 3; i++) { 383 unsigned long long rel_time; 384 385 if (!ts->ts[i].tv_sec && !ts->ts[i].tv_nsec) 386 continue; 387 388 rel_time = (ts->ts[i].tv_sec - time_start_real.tv_sec) * 389 (1000ULL * 1000) + 390 (ts->ts[i].tv_nsec - time_start_real.tv_nsec) / 391 1000; 392 printf(" %5s ts%d %lluus\n", 393 cs_ts_info2str(see->ee_info), 394 i, rel_time); 395 ts_seen |= 1 << see->ee_info; 396 } 397 } 398 399 return ts_seen; 400 } 401 402 static void ca_set_sockopts(int fd) 403 { 404 if (opt.sockopt.mark && 405 setsockopt(fd, SOL_SOCKET, SO_MARK, 406 &opt.sockopt.mark, sizeof(opt.sockopt.mark))) 407 error(ERN_SOCKOPT, errno, "setsockopt SO_MARK"); 408 if (opt.sockopt.dontfrag && 409 setsockopt(fd, SOL_IPV6, IPV6_DONTFRAG, 410 &opt.sockopt.dontfrag, sizeof(opt.sockopt.dontfrag))) 411 error(ERN_SOCKOPT, errno, "setsockopt IPV6_DONTFRAG"); 412 if (opt.sockopt.tclass && 413 setsockopt(fd, SOL_IPV6, IPV6_TCLASS, 414 &opt.sockopt.tclass, sizeof(opt.sockopt.tclass))) 415 error(ERN_SOCKOPT, errno, "setsockopt IPV6_TCLASS"); 416 if (opt.sockopt.hlimit && 417 setsockopt(fd, SOL_IPV6, IPV6_UNICAST_HOPS, 418 &opt.sockopt.hlimit, sizeof(opt.sockopt.hlimit))) 419 error(ERN_SOCKOPT, errno, "setsockopt IPV6_HOPLIMIT"); 420 if (opt.sockopt.priority && 421 setsockopt(fd, SOL_SOCKET, SO_PRIORITY, 422 &opt.sockopt.priority, sizeof(opt.sockopt.priority))) 423 error(ERN_SOCKOPT, errno, "setsockopt SO_PRIORITY"); 424 425 if (opt.txtime.ena) { 426 struct sock_txtime so_txtime = { 427 .clockid = CLOCK_MONOTONIC, 428 }; 429 430 if (setsockopt(fd, SOL_SOCKET, SO_TXTIME, 431 &so_txtime, sizeof(so_txtime))) 432 error(ERN_SOCKOPT, errno, "setsockopt TXTIME"); 433 } 434 if (opt.ts.ena) { 435 __u32 val = SOF_TIMESTAMPING_SOFTWARE | 436 SOF_TIMESTAMPING_OPT_TSONLY; 437 438 if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING, 439 &val, sizeof(val))) 440 error(ERN_SOCKOPT, errno, "setsockopt TIMESTAMPING"); 441 } 442 } 443 444 int main(int argc, char *argv[]) 445 { 446 struct addrinfo hints, *ai; 447 struct iovec iov[1]; 448 unsigned char *buf; 449 struct msghdr msg; 450 char cbuf[1024]; 451 int err; 452 int fd; 453 int i; 454 455 cs_parse_args(argc, argv); 456 457 buf = malloc(opt.size); 458 memrnd(buf, opt.size); 459 460 memset(&hints, 0, sizeof(hints)); 461 hints.ai_family = opt.sock.family; 462 463 ai = NULL; 464 err = getaddrinfo(opt.host, opt.service, &hints, &ai); 465 if (err) { 466 fprintf(stderr, "Can't resolve address [%s]:%s\n", 467 opt.host, opt.service); 468 return ERN_SOCK_CREATE; 469 } 470 471 if (ai->ai_family == AF_INET6 && opt.sock.proto == IPPROTO_ICMP) 472 opt.sock.proto = IPPROTO_ICMPV6; 473 474 fd = socket(ai->ai_family, opt.sock.type, opt.sock.proto); 475 if (fd < 0) { 476 fprintf(stderr, "Can't open socket: %s\n", strerror(errno)); 477 freeaddrinfo(ai); 478 return ERN_RESOLVE; 479 } 480 481 if (opt.sock.proto == IPPROTO_ICMP) { 482 buf[0] = ICMP_ECHO; 483 buf[1] = 0; 484 } else if (opt.sock.proto == IPPROTO_ICMPV6) { 485 buf[0] = ICMPV6_ECHO_REQUEST; 486 buf[1] = 0; 487 } else if (opt.sock.type == SOCK_RAW) { 488 struct udphdr hdr = { 1, 2, htons(opt.size), 0 }; 489 struct sockaddr_in6 *sin6 = (void *)ai->ai_addr; 490 491 memcpy(buf, &hdr, sizeof(hdr)); 492 sin6->sin6_port = htons(opt.sock.proto); 493 } 494 495 ca_set_sockopts(fd); 496 497 if (clock_gettime(CLOCK_REALTIME, &time_start_real)) 498 error(ERN_GETTIME, errno, "gettime REALTIME"); 499 if (clock_gettime(CLOCK_MONOTONIC, &time_start_mono)) 500 error(ERN_GETTIME, errno, "gettime MONOTONIC"); 501 502 iov[0].iov_base = buf; 503 iov[0].iov_len = opt.size; 504 505 memset(&msg, 0, sizeof(msg)); 506 msg.msg_name = ai->ai_addr; 507 msg.msg_namelen = ai->ai_addrlen; 508 msg.msg_iov = iov; 509 msg.msg_iovlen = 1; 510 511 cs_write_cmsg(fd, &msg, cbuf, sizeof(cbuf)); 512 513 for (i = 0; i < opt.num_pkt; i++) { 514 err = sendmsg(fd, &msg, 0); 515 if (err < 0) { 516 if (!opt.silent_send) 517 fprintf(stderr, "send failed: %s\n", strerror(errno)); 518 err = ERN_SEND; 519 goto err_out; 520 } else if (err != (int)opt.size) { 521 fprintf(stderr, "short send\n"); 522 err = ERN_SEND_SHORT; 523 goto err_out; 524 } 525 } 526 err = ERN_SUCCESS; 527 528 if (opt.ts.ena) { 529 unsigned long seen; 530 int i; 531 532 /* Make sure all timestamps have time to loop back */ 533 for (i = 0; i < 40; i++) { 534 seen = cs_read_cmsg(fd, &msg, cbuf, sizeof(cbuf)); 535 if (seen & (1 << SCM_TSTAMP_SND)) 536 break; 537 usleep(opt.txtime.delay / 20); 538 } 539 } 540 541 err_out: 542 close(fd); 543 freeaddrinfo(ai); 544 return err; 545 } 546