1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Test the SO_TXTIME API 4 * 5 * Takes a stream of { payload, delivery time }[], to be sent across two 6 * processes. Start this program on two separate network namespaces or 7 * connected hosts, one instance in transmit mode and the other in receive 8 * mode using the '-r' option. Receiver will compare arrival timestamps to 9 * the expected stream. Sender will read transmit timestamps from the error 10 * queue. The streams can differ due to out-of-order delivery and drops. 11 */ 12 13 #define _GNU_SOURCE 14 15 #include <arpa/inet.h> 16 #include <error.h> 17 #include <errno.h> 18 #include <inttypes.h> 19 #include <linux/net_tstamp.h> 20 #include <linux/errqueue.h> 21 #include <linux/if_ether.h> 22 #include <linux/ipv6.h> 23 #include <linux/udp.h> 24 #include <stdbool.h> 25 #include <stdlib.h> 26 #include <stdio.h> 27 #include <string.h> 28 #include <sys/socket.h> 29 #include <sys/stat.h> 30 #include <sys/time.h> 31 #include <sys/types.h> 32 #include <time.h> 33 #include <unistd.h> 34 #include <poll.h> 35 36 static int cfg_clockid = CLOCK_TAI; 37 static uint16_t cfg_port = 8000; 38 static int cfg_variance_us = 4000; 39 static uint64_t cfg_start_time_ns; 40 static int cfg_mark; 41 static bool cfg_rx; 42 43 static uint64_t glob_tstart; 44 static uint64_t tdeliver_max; 45 46 /* encode one timed transmission (of a 1B payload) */ 47 struct timed_send { 48 char data; 49 int64_t delay_us; 50 }; 51 52 #define MAX_NUM_PKT 8 53 static struct timed_send cfg_buf[MAX_NUM_PKT]; 54 static int cfg_num_pkt; 55 56 static int cfg_errq_level; 57 static int cfg_errq_type; 58 59 static struct sockaddr_storage cfg_dst_addr; 60 static struct sockaddr_storage cfg_src_addr; 61 static socklen_t cfg_alen; 62 63 static uint64_t gettime_ns(clockid_t clock) 64 { 65 struct timespec ts; 66 67 if (clock_gettime(clock, &ts)) 68 error(1, errno, "gettime"); 69 70 return ts.tv_sec * (1000ULL * 1000 * 1000) + ts.tv_nsec; 71 } 72 73 static void do_send_one(int fdt, struct timed_send *ts) 74 { 75 char control[CMSG_SPACE(sizeof(uint64_t))]; 76 struct msghdr msg = {0}; 77 struct iovec iov = {0}; 78 struct cmsghdr *cm; 79 uint64_t tdeliver; 80 int ret; 81 82 iov.iov_base = &ts->data; 83 iov.iov_len = 1; 84 85 msg.msg_iov = &iov; 86 msg.msg_iovlen = 1; 87 msg.msg_name = (struct sockaddr *)&cfg_dst_addr; 88 msg.msg_namelen = cfg_alen; 89 90 if (ts->delay_us >= 0) { 91 memset(control, 0, sizeof(control)); 92 msg.msg_control = &control; 93 msg.msg_controllen = sizeof(control); 94 95 tdeliver = glob_tstart + ts->delay_us * 1000; 96 tdeliver_max = tdeliver_max > tdeliver ? 97 tdeliver_max : tdeliver; 98 99 cm = CMSG_FIRSTHDR(&msg); 100 cm->cmsg_level = SOL_SOCKET; 101 cm->cmsg_type = SCM_TXTIME; 102 cm->cmsg_len = CMSG_LEN(sizeof(tdeliver)); 103 memcpy(CMSG_DATA(cm), &tdeliver, sizeof(tdeliver)); 104 } 105 106 ret = sendmsg(fdt, &msg, 0); 107 if (ret == -1) 108 error(1, errno, "write"); 109 if (ret == 0) 110 error(1, 0, "write: 0B"); 111 112 } 113 114 static void do_recv_one(int fdr, struct timed_send *ts) 115 { 116 int64_t tstop, texpect; 117 char rbuf[2]; 118 int ret; 119 120 ret = recv(fdr, rbuf, sizeof(rbuf), 0); 121 if (ret == -1 && errno == EAGAIN) 122 error(1, EAGAIN, "recv: timeout"); 123 if (ret == -1) 124 error(1, errno, "read"); 125 if (ret != 1) 126 error(1, 0, "read: %dB", ret); 127 128 tstop = (gettime_ns(cfg_clockid) - glob_tstart) / 1000; 129 texpect = ts->delay_us >= 0 ? ts->delay_us : 0; 130 131 fprintf(stderr, "payload:%c delay:%lld expected:%lld (us)\n", 132 rbuf[0], (long long)tstop, (long long)texpect); 133 134 if (rbuf[0] != ts->data) 135 error(1, 0, "payload mismatch. expected %c", ts->data); 136 137 if (llabs(tstop - texpect) > cfg_variance_us) 138 error(1, 0, "exceeds variance (%d us)", cfg_variance_us); 139 } 140 141 static void do_recv_verify_empty(int fdr) 142 { 143 char rbuf[1]; 144 int ret; 145 146 ret = recv(fdr, rbuf, sizeof(rbuf), 0); 147 if (ret != -1 || errno != EAGAIN) 148 error(1, 0, "recv: not empty as expected (%d, %d)", ret, errno); 149 } 150 151 static int do_recv_errqueue_timeout(int fdt) 152 { 153 char control[CMSG_SPACE(sizeof(struct sock_extended_err)) + 154 CMSG_SPACE(sizeof(struct sockaddr_in6))] = {0}; 155 char data[sizeof(struct ethhdr) + sizeof(struct ipv6hdr) + 156 sizeof(struct udphdr) + 1]; 157 struct sock_extended_err *err; 158 int ret, num_tstamp = 0; 159 struct msghdr msg = {0}; 160 struct iovec iov = {0}; 161 struct cmsghdr *cm; 162 int64_t tstamp = 0; 163 164 iov.iov_base = data; 165 iov.iov_len = sizeof(data); 166 167 msg.msg_iov = &iov; 168 msg.msg_iovlen = 1; 169 170 msg.msg_control = control; 171 msg.msg_controllen = sizeof(control); 172 173 while (1) { 174 const char *reason; 175 176 ret = recvmsg(fdt, &msg, MSG_ERRQUEUE); 177 if (ret == -1 && errno == EAGAIN) 178 break; 179 if (ret == -1) 180 error(1, errno, "errqueue"); 181 if (msg.msg_flags != MSG_ERRQUEUE) 182 error(1, 0, "errqueue: flags 0x%x\n", msg.msg_flags); 183 184 cm = CMSG_FIRSTHDR(&msg); 185 if (cm->cmsg_level != cfg_errq_level || 186 cm->cmsg_type != cfg_errq_type) 187 error(1, 0, "errqueue: type 0x%x.0x%x\n", 188 cm->cmsg_level, cm->cmsg_type); 189 190 err = (struct sock_extended_err *)CMSG_DATA(cm); 191 if (err->ee_origin != SO_EE_ORIGIN_TXTIME) 192 error(1, 0, "errqueue: origin 0x%x\n", err->ee_origin); 193 194 switch (err->ee_errno) { 195 case ECANCELED: 196 if (err->ee_code != SO_EE_CODE_TXTIME_MISSED) 197 error(1, 0, "errqueue: unknown ECANCELED %u\n", 198 err->ee_code); 199 reason = "missed txtime"; 200 break; 201 case EINVAL: 202 if (err->ee_code != SO_EE_CODE_TXTIME_INVALID_PARAM) 203 error(1, 0, "errqueue: unknown EINVAL %u\n", 204 err->ee_code); 205 reason = "invalid txtime"; 206 break; 207 default: 208 error(1, 0, "errqueue: errno %u code %u\n", 209 err->ee_errno, err->ee_code); 210 } 211 212 tstamp = ((int64_t) err->ee_data) << 32 | err->ee_info; 213 tstamp -= (int64_t) glob_tstart; 214 tstamp /= 1000 * 1000; 215 fprintf(stderr, "send: pkt %c at %" PRId64 "ms dropped: %s\n", 216 data[ret - 1], tstamp, reason); 217 218 msg.msg_flags = 0; 219 msg.msg_controllen = sizeof(control); 220 num_tstamp++; 221 } 222 223 return num_tstamp; 224 } 225 226 static void recv_errqueue_msgs(int fdt) 227 { 228 struct pollfd pfd = { .fd = fdt, .events = POLLERR }; 229 const int timeout_ms = 10; 230 int ret, num_tstamp = 0; 231 232 do { 233 ret = poll(&pfd, 1, timeout_ms); 234 if (ret == -1) 235 error(1, errno, "poll"); 236 237 if (ret && (pfd.revents & POLLERR)) 238 num_tstamp += do_recv_errqueue_timeout(fdt); 239 240 if (num_tstamp == cfg_num_pkt) 241 break; 242 243 } while (gettime_ns(cfg_clockid) < tdeliver_max); 244 } 245 246 static void start_time_wait(void) 247 { 248 uint64_t now; 249 int err; 250 251 if (!cfg_start_time_ns) 252 return; 253 254 now = gettime_ns(CLOCK_REALTIME); 255 if (cfg_start_time_ns < now) 256 return; 257 258 err = usleep((cfg_start_time_ns - now) / 1000); 259 if (err) 260 error(1, errno, "usleep"); 261 } 262 263 static void setsockopt_txtime(int fd) 264 { 265 struct sock_txtime so_txtime_val = { .clockid = cfg_clockid }; 266 struct sock_txtime so_txtime_val_read = { 0 }; 267 socklen_t vallen = sizeof(so_txtime_val); 268 269 so_txtime_val.flags = SOF_TXTIME_REPORT_ERRORS; 270 271 if (setsockopt(fd, SOL_SOCKET, SO_TXTIME, 272 &so_txtime_val, sizeof(so_txtime_val))) 273 error(1, errno, "setsockopt txtime"); 274 275 if (getsockopt(fd, SOL_SOCKET, SO_TXTIME, 276 &so_txtime_val_read, &vallen)) 277 error(1, errno, "getsockopt txtime"); 278 279 if (vallen != sizeof(so_txtime_val) || 280 memcmp(&so_txtime_val, &so_txtime_val_read, vallen)) 281 error(1, 0, "getsockopt txtime: mismatch"); 282 } 283 284 static int setup_tx(struct sockaddr *addr, socklen_t alen) 285 { 286 int fd; 287 288 fd = socket(addr->sa_family, SOCK_DGRAM, 0); 289 if (fd == -1) 290 error(1, errno, "socket t"); 291 292 if (connect(fd, addr, alen)) 293 error(1, errno, "connect"); 294 295 setsockopt_txtime(fd); 296 297 if (cfg_mark && 298 setsockopt(fd, SOL_SOCKET, SO_MARK, &cfg_mark, sizeof(cfg_mark))) 299 error(1, errno, "setsockopt mark"); 300 301 return fd; 302 } 303 304 static int setup_rx(struct sockaddr *addr, socklen_t alen) 305 { 306 struct timeval tv = { .tv_usec = 100 * 1000 }; 307 int fd; 308 309 fd = socket(addr->sa_family, SOCK_DGRAM, 0); 310 if (fd == -1) 311 error(1, errno, "socket r"); 312 313 if (bind(fd, addr, alen)) 314 error(1, errno, "bind"); 315 316 if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv))) 317 error(1, errno, "setsockopt rcv timeout"); 318 319 return fd; 320 } 321 322 static void do_test_tx(struct sockaddr *addr, socklen_t alen) 323 { 324 int fdt, i; 325 326 fprintf(stderr, "\nSO_TXTIME ipv%c clock %s\n", 327 addr->sa_family == PF_INET ? '4' : '6', 328 cfg_clockid == CLOCK_TAI ? "tai" : "monotonic"); 329 330 fdt = setup_tx(addr, alen); 331 332 start_time_wait(); 333 glob_tstart = gettime_ns(cfg_clockid); 334 335 for (i = 0; i < cfg_num_pkt; i++) 336 do_send_one(fdt, &cfg_buf[i]); 337 338 recv_errqueue_msgs(fdt); 339 340 if (close(fdt)) 341 error(1, errno, "close t"); 342 } 343 344 static void do_test_rx(struct sockaddr *addr, socklen_t alen) 345 { 346 int fdr, i; 347 348 fdr = setup_rx(addr, alen); 349 350 start_time_wait(); 351 glob_tstart = gettime_ns(cfg_clockid); 352 353 for (i = 0; i < cfg_num_pkt; i++) 354 do_recv_one(fdr, &cfg_buf[i]); 355 356 do_recv_verify_empty(fdr); 357 358 if (close(fdr)) 359 error(1, errno, "close r"); 360 } 361 362 static void setup_sockaddr(int domain, const char *str_addr, 363 struct sockaddr_storage *sockaddr) 364 { 365 struct sockaddr_in6 *addr6 = (void *) sockaddr; 366 struct sockaddr_in *addr4 = (void *) sockaddr; 367 368 switch (domain) { 369 case PF_INET: 370 memset(addr4, 0, sizeof(*addr4)); 371 addr4->sin_family = AF_INET; 372 addr4->sin_port = htons(cfg_port); 373 if (str_addr && 374 inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1) 375 error(1, 0, "ipv4 parse error: %s", str_addr); 376 break; 377 case PF_INET6: 378 memset(addr6, 0, sizeof(*addr6)); 379 addr6->sin6_family = AF_INET6; 380 addr6->sin6_port = htons(cfg_port); 381 if (str_addr && 382 inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1) 383 error(1, 0, "ipv6 parse error: %s", str_addr); 384 break; 385 } 386 } 387 388 static int parse_io(const char *optarg, struct timed_send *array) 389 { 390 char *arg, *tok; 391 int aoff = 0; 392 393 arg = strdup(optarg); 394 if (!arg) 395 error(1, errno, "strdup"); 396 397 while ((tok = strtok(arg, ","))) { 398 arg = NULL; /* only pass non-zero on first call */ 399 400 if (aoff / 2 == MAX_NUM_PKT) 401 error(1, 0, "exceeds max pkt count (%d)", MAX_NUM_PKT); 402 403 if (aoff & 1) { /* parse delay */ 404 array->delay_us = strtol(tok, NULL, 0) * 1000; 405 array++; 406 } else { /* parse character */ 407 array->data = tok[0]; 408 } 409 410 aoff++; 411 } 412 413 free(arg); 414 415 return aoff / 2; 416 } 417 418 static void usage(const char *progname) 419 { 420 fprintf(stderr, "\nUsage: %s [options] <payload>\n" 421 "Options:\n" 422 " -4 only IPv4\n" 423 " -6 only IPv6\n" 424 " -c <clock> monotonic (default) or tai\n" 425 " -D <addr> destination IP address (server)\n" 426 " -S <addr> source IP address (client)\n" 427 " -r run rx mode\n" 428 " -t <nsec> start time (UTC nanoseconds)\n" 429 " -m <mark> socket mark\n" 430 "\n", 431 progname); 432 exit(1); 433 } 434 435 static void parse_opts(int argc, char **argv) 436 { 437 char *daddr = NULL, *saddr = NULL; 438 int domain = PF_UNSPEC; 439 int c; 440 441 while ((c = getopt(argc, argv, "46c:S:D:rt:m:")) != -1) { 442 switch (c) { 443 case '4': 444 if (domain != PF_UNSPEC) 445 error(1, 0, "Pass one of -4 or -6"); 446 domain = PF_INET; 447 cfg_alen = sizeof(struct sockaddr_in); 448 cfg_errq_level = SOL_IP; 449 cfg_errq_type = IP_RECVERR; 450 break; 451 case '6': 452 if (domain != PF_UNSPEC) 453 error(1, 0, "Pass one of -4 or -6"); 454 domain = PF_INET6; 455 cfg_alen = sizeof(struct sockaddr_in6); 456 cfg_errq_level = SOL_IPV6; 457 cfg_errq_type = IPV6_RECVERR; 458 break; 459 case 'c': 460 if (!strcmp(optarg, "tai")) 461 cfg_clockid = CLOCK_TAI; 462 else if (!strcmp(optarg, "monotonic") || 463 !strcmp(optarg, "mono")) 464 cfg_clockid = CLOCK_MONOTONIC; 465 else 466 error(1, 0, "unknown clock id %s", optarg); 467 break; 468 case 'S': 469 saddr = optarg; 470 break; 471 case 'D': 472 daddr = optarg; 473 break; 474 case 'r': 475 cfg_rx = true; 476 break; 477 case 't': 478 cfg_start_time_ns = strtol(optarg, NULL, 0); 479 break; 480 case 'm': 481 cfg_mark = strtol(optarg, NULL, 0); 482 break; 483 default: 484 usage(argv[0]); 485 } 486 } 487 488 if (argc - optind != 1) 489 usage(argv[0]); 490 491 if (domain == PF_UNSPEC) 492 error(1, 0, "Pass one of -4 or -6"); 493 if (!daddr) 494 error(1, 0, "-D <server addr> required\n"); 495 if (!cfg_rx && !saddr) 496 error(1, 0, "-S <client addr> required\n"); 497 498 setup_sockaddr(domain, daddr, &cfg_dst_addr); 499 setup_sockaddr(domain, saddr, &cfg_src_addr); 500 501 cfg_num_pkt = parse_io(argv[optind], cfg_buf); 502 } 503 504 int main(int argc, char **argv) 505 { 506 parse_opts(argc, argv); 507 508 if (cfg_rx) 509 do_test_rx((void *)&cfg_dst_addr, cfg_alen); 510 else 511 do_test_tx((void *)&cfg_src_addr, cfg_alen); 512 513 return 0; 514 } 515