1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646
|
/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2016-2017
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
Functions for NTP I/O specific to Linux
*/
#include "config.h"
#include "sysincl.h"
#include <ifaddrs.h>
#include <linux/errqueue.h>
#include <linux/ethtool.h>
#include <linux/net_tstamp.h>
#include <linux/ptp_clock.h>
#include <linux/sockios.h>
#include <net/if.h>
#include "array.h"
#include "conf.h"
#include "hwclock.h"
#include "local.h"
#include "logging.h"
#include "ntp_core.h"
#include "ntp_io.h"
#include "ntp_io_linux.h"
#include "ntp_sources.h"
#include "sched.h"
#include "sys_linux.h"
#include "util.h"
union sockaddr_in46 {
struct sockaddr_in in4;
#ifdef FEAT_IPV6
struct sockaddr_in6 in6;
#endif
struct sockaddr u;
};
struct Interface {
char name[IF_NAMESIZE];
int if_index;
int phc_fd;
/* Link speed in mbit/s */
int link_speed;
/* Start of UDP data at layer 2 for IPv4 and IPv6 */
int l2_udp4_ntp_start;
int l2_udp6_ntp_start;
/* Compensation of errors in TX and RX timestamping */
double tx_comp;
double rx_comp;
HCL_Instance clock;
};
/* Number of PHC readings per HW clock sample */
#define PHC_READINGS 10
/* Maximum acceptable offset between HW and daemon/kernel timestamp */
#define MAX_TS_DELAY 1.0
/* Array of Interfaces */
static ARR_Instance interfaces;
/* RX/TX and TX-specific timestamping socket options */
static int ts_flags;
static int ts_tx_flags;
/* Flag indicating the socket options can't be changed in control messages */
static int permanent_ts_options;
/* ================================================== */
static int
add_interface(const char *name, double tx_comp, double rx_comp)
{
struct ethtool_ts_info ts_info;
struct hwtstamp_config ts_config;
struct ifreq req;
int sock_fd, if_index, phc_index, phc_fd;
unsigned int i;
struct Interface *iface;
char phc_path[64];
/* Check if the interface was not already added */
for (i = 0; i < ARR_GetSize(interfaces); i++) {
if (!strcmp(name, ((struct Interface *)ARR_GetElement(interfaces, i))->name))
return 1;
}
sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (sock_fd < 0)
return 0;
memset(&req, 0, sizeof (req));
memset(&ts_info, 0, sizeof (ts_info));
if (snprintf(req.ifr_name, sizeof (req.ifr_name), "%s", name) >= sizeof (req.ifr_name)) {
close(sock_fd);
return 0;
}
if (ioctl(sock_fd, SIOCGIFINDEX, &req)) {
DEBUG_LOG(LOGF_NtpIOLinux, "ioctl(%s) failed : %s", "SIOCGIFINDEX", strerror(errno));
close(sock_fd);
return 0;
}
if_index = req.ifr_ifindex;
ts_info.cmd = ETHTOOL_GET_TS_INFO;
req.ifr_data = (char *)&ts_info;
if (ioctl(sock_fd, SIOCETHTOOL, &req)) {
DEBUG_LOG(LOGF_NtpIOLinux, "ioctl(%s) failed : %s", "SIOCETHTOOL", strerror(errno));
close(sock_fd);
return 0;
}
ts_config.flags = 0;
ts_config.tx_type = HWTSTAMP_TX_ON;
ts_config.rx_filter = HWTSTAMP_FILTER_ALL;
req.ifr_data = (char *)&ts_config;
if (ioctl(sock_fd, SIOCSHWTSTAMP, &req)) {
DEBUG_LOG(LOGF_NtpIOLinux, "ioctl(%s) failed : %s", "SIOCSHWTSTAMP", strerror(errno));
close(sock_fd);
return 0;
}
close(sock_fd);
phc_index = ts_info.phc_index;
if (snprintf(phc_path, sizeof (phc_path), "/dev/ptp%d", phc_index) >= sizeof (phc_path))
return 0;
phc_fd = open(phc_path, O_RDONLY);
if (phc_fd < 0) {
LOG(LOGS_ERR, LOGF_NtpIOLinux, "Could not open %s : %s", phc_path, strerror(errno));
return 0;
}
UTI_FdSetCloexec(phc_fd);
iface = ARR_GetNewElement(interfaces);
snprintf(iface->name, sizeof (iface->name), "%s", name);
iface->if_index = if_index;
iface->phc_fd = phc_fd;
/* Start with 1 gbit and no VLANs or IPv4/IPv6 options */
iface->link_speed = 1000;
iface->l2_udp4_ntp_start = 42;
iface->l2_udp6_ntp_start = 62;
iface->tx_comp = tx_comp;
iface->rx_comp = rx_comp;
iface->clock = HCL_CreateInstance();
DEBUG_LOG(LOGF_NtpIOLinux, "Enabled HW timestamping on %s", name);
return 1;
}
/* ================================================== */
static int
add_all_interfaces(double tx_comp, double rx_comp)
{
struct ifaddrs *ifaddr, *ifa;
int r;
if (getifaddrs(&ifaddr)) {
DEBUG_LOG(LOGF_NtpIOLinux, "getifaddrs() failed : %s", strerror(errno));
return 0;
}
for (r = 0, ifa = ifaddr; ifa; ifa = ifa->ifa_next) {
if (add_interface(ifa->ifa_name, tx_comp, rx_comp))
r = 1;
}
freeifaddrs(ifaddr);
/* Return success if at least one interface was added */
return r;
}
/* ================================================== */
static void
update_interface_speed(struct Interface *iface)
{
struct ethtool_cmd cmd;
struct ifreq req;
int sock_fd;
sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (sock_fd < 0)
return;
memset(&req, 0, sizeof (req));
memset(&cmd, 0, sizeof (cmd));
snprintf(req.ifr_name, sizeof (req.ifr_name), "%s", iface->name);
cmd.cmd = ETHTOOL_GSET;
req.ifr_data = (char *)&cmd;
if (ioctl(sock_fd, SIOCETHTOOL, &req)) {
DEBUG_LOG(LOGF_NtpIOLinux, "ioctl(%s) failed : %s", "SIOCETHTOOL", strerror(errno));
close(sock_fd);
return;
}
close(sock_fd);
iface->link_speed = ethtool_cmd_speed(&cmd);
}
/* ================================================== */
void
NIO_Linux_Initialise(void)
{
double tx_comp, rx_comp;
char *name;
unsigned int i;
int hwts;
interfaces = ARR_CreateInstance(sizeof (struct Interface));
/* Enable HW timestamping on specified interfaces. If "*" was specified, try
all interfaces. If no interface was specified, enable SW timestamping. */
for (i = hwts = 0; CNF_GetHwTsInterface(i, &name, &tx_comp, &rx_comp); i++) {
if (!strcmp("*", name))
continue;
if (!add_interface(name, tx_comp, rx_comp))
LOG_FATAL(LOGF_NtpIO, "Could not enable HW timestamping on %s", name);
hwts = 1;
}
for (i = 0; CNF_GetHwTsInterface(i, &name, &tx_comp, &rx_comp); i++) {
if (strcmp("*", name))
continue;
if (add_all_interfaces(tx_comp, rx_comp))
hwts = 1;
break;
}
if (hwts) {
ts_flags = SOF_TIMESTAMPING_RAW_HARDWARE | SOF_TIMESTAMPING_RX_HARDWARE;
ts_tx_flags = SOF_TIMESTAMPING_TX_HARDWARE;
} else {
ts_flags = SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_RX_SOFTWARE;
ts_tx_flags = SOF_TIMESTAMPING_TX_SOFTWARE;
}
/* Enable IP_PKTINFO in messages looped back to the error queue */
ts_flags |= SOF_TIMESTAMPING_OPT_CMSG;
/* Kernels before 4.7 ignore timestamping flags set in control messages */
permanent_ts_options = !SYS_Linux_CheckKernelVersion(4, 7);
}
/* ================================================== */
void
NIO_Linux_Finalise(void)
{
struct Interface *iface;
unsigned int i;
for (i = 0; i < ARR_GetSize(interfaces); i++) {
iface = ARR_GetElement(interfaces, i);
HCL_DestroyInstance(iface->clock);
close(iface->phc_fd);
}
ARR_DestroyInstance(interfaces);
}
/* ================================================== */
int
NIO_Linux_SetTimestampSocketOptions(int sock_fd, int client_only, int *events)
{
int val, flags;
if (!ts_flags)
return 0;
/* Enable SCM_TIMESTAMPING control messages and the socket's error queue in
order to receive our transmitted packets with more accurate timestamps */
val = 1;
flags = ts_flags;
if (client_only || permanent_ts_options)
flags |= ts_tx_flags;
if (setsockopt(sock_fd, SOL_SOCKET, SO_SELECT_ERR_QUEUE, &val, sizeof (val)) < 0) {
LOG(LOGS_ERR, LOGF_NtpIOLinux, "Could not set %s socket option", "SO_SELECT_ERR_QUEUE");
ts_flags = 0;
return 0;
}
if (setsockopt(sock_fd, SOL_SOCKET, SO_TIMESTAMPING, &flags, sizeof (flags)) < 0) {
LOG(LOGS_ERR, LOGF_NtpIOLinux, "Could not set %s socket option", "SO_TIMESTAMPING");
ts_flags = 0;
return 0;
}
*events |= SCH_FILE_EXCEPTION;
return 1;
}
/* ================================================== */
static int
get_phc_sample(int phc_fd, struct timespec *phc_ts, struct timespec *local_ts, double *p_delay)
{
struct ptp_sys_offset sys_off;
struct timespec ts1, ts2, ts3, phc_tss[PHC_READINGS], sys_tss[PHC_READINGS];
double min_delay = 0.0, delays[PHC_READINGS], phc_sum, local_sum, local_prec;
int i, n;
/* Silence valgrind */
memset(&sys_off, 0, sizeof (sys_off));
sys_off.n_samples = PHC_READINGS;
if (ioctl(phc_fd, PTP_SYS_OFFSET, &sys_off)) {
DEBUG_LOG(LOGF_NtpIOLinux, "ioctl(%s) failed : %s", "PTP_SYS_OFFSET", strerror(errno));
return 0;
}
for (i = 0; i < PHC_READINGS; i++) {
ts1.tv_sec = sys_off.ts[i * 2].sec;
ts1.tv_nsec = sys_off.ts[i * 2].nsec;
ts2.tv_sec = sys_off.ts[i * 2 + 1].sec;
ts2.tv_nsec = sys_off.ts[i * 2 + 1].nsec;
ts3.tv_sec = sys_off.ts[i * 2 + 2].sec;
ts3.tv_nsec = sys_off.ts[i * 2 + 2].nsec;
sys_tss[i] = ts1;
phc_tss[i] = ts2;
delays[i] = UTI_DiffTimespecsToDouble(&ts3, &ts1);
if (delays[i] <= 0.0)
/* Step in the middle of a PHC reading? */
return 0;
if (!i || delays[i] < min_delay)
min_delay = delays[i];
}
local_prec = LCL_GetSysPrecisionAsQuantum();
/* Combine best readings */
for (i = n = 0, phc_sum = local_sum = 0.0; i < PHC_READINGS; i++) {
if (delays[i] > min_delay + local_prec)
continue;
phc_sum += UTI_DiffTimespecsToDouble(&phc_tss[i], &phc_tss[0]);
local_sum += UTI_DiffTimespecsToDouble(&sys_tss[i], &sys_tss[0]) + delays[i] / 2.0;
n++;
}
assert(n);
UTI_AddDoubleToTimespec(&phc_tss[0], phc_sum / n, phc_ts);
UTI_AddDoubleToTimespec(&sys_tss[0], local_sum / n, &ts1);
LCL_CookTime(&ts1, local_ts, NULL);
*p_delay = min_delay;
return 1;
}
/* ================================================== */
static struct Interface *
get_interface(int if_index)
{
struct Interface *iface;
unsigned int i;
for (i = 0; i < ARR_GetSize(interfaces); i++) {
iface = ARR_GetElement(interfaces, i);
if (iface->if_index != if_index)
continue;
return iface;
}
return NULL;
}
/* ================================================== */
static void
process_hw_timestamp(struct Interface *iface, struct timespec *hw_ts,
NTP_Local_Timestamp *local_ts, int rx_ntp_length, int family)
{
struct timespec sample_phc_ts, sample_local_ts, ts;
double sample_delay, rx_correction, ts_delay, err;
int l2_length;
if (HCL_NeedsNewSample(iface->clock, &local_ts->ts)) {
if (!get_phc_sample(iface->phc_fd, &sample_phc_ts, &sample_local_ts, &sample_delay))
return;
HCL_AccumulateSample(iface->clock, &sample_phc_ts, &sample_local_ts,
sample_delay / 2.0);
update_interface_speed(iface);
}
/* We need to transpose RX timestamps as hardware timestamps are normally
preamble timestamps and RX timestamps in NTP are supposed to be trailer
timestamps. Without raw sockets we don't know the length of the packet
at layer 2, so we make an assumption that UDP data start at the same
position as in the last transmitted packet which had a HW TX timestamp. */
if (rx_ntp_length && iface->link_speed) {
l2_length = (family == IPADDR_INET4 ? iface->l2_udp4_ntp_start :
iface->l2_udp6_ntp_start) + rx_ntp_length + 4;
rx_correction = l2_length / (1.0e6 / 8 * iface->link_speed);
UTI_AddDoubleToTimespec(hw_ts, rx_correction, hw_ts);
}
if (!rx_ntp_length && iface->tx_comp)
UTI_AddDoubleToTimespec(hw_ts, iface->tx_comp, hw_ts);
else if (rx_ntp_length && iface->rx_comp)
UTI_AddDoubleToTimespec(hw_ts, -iface->rx_comp, hw_ts);
if (!HCL_CookTime(iface->clock, hw_ts, &ts, &err))
return;
ts_delay = UTI_DiffTimespecsToDouble(&local_ts->ts, &ts);
if (fabs(ts_delay) > MAX_TS_DELAY) {
DEBUG_LOG(LOGF_NtpIOLinux, "Unacceptable timestamp delay %.9f", ts_delay);
return;
}
local_ts->ts = ts;
local_ts->err = err;
local_ts->source = NTP_TS_HARDWARE;
}
/* ================================================== */
/* Extract UDP data from a layer 2 message. Supported is Ethernet
with optional VLAN tags. */
static int
extract_udp_data(unsigned char *msg, NTP_Remote_Address *remote_addr, int len)
{
unsigned char *msg_start = msg;
union sockaddr_in46 addr;
remote_addr->ip_addr.family = IPADDR_UNSPEC;
remote_addr->port = 0;
/* Skip MACs */
if (len < 12)
return 0;
len -= 12, msg += 12;
/* Skip VLAN tag(s) if present */
while (len >= 4 && msg[0] == 0x81 && msg[1] == 0x00)
len -= 4, msg += 4;
/* Skip IPv4 or IPv6 ethertype */
if (len < 2 || !((msg[0] == 0x08 && msg[1] == 0x00) ||
(msg[0] == 0x86 && msg[1] == 0xdd)))
return 0;
len -= 2, msg += 2;
/* Parse destination address and port from IPv4/IPv6 and UDP headers */
if (len >= 20 && msg[0] >> 4 == 4) {
int ihl = (msg[0] & 0xf) * 4;
if (len < ihl + 8 || msg[9] != 17)
return 0;
memcpy(&addr.in4.sin_addr.s_addr, msg + 16, sizeof (uint32_t));
addr.in4.sin_port = *(uint16_t *)(msg + ihl + 2);
addr.in4.sin_family = AF_INET;
len -= ihl + 8, msg += ihl + 8;
#ifdef FEAT_IPV6
} else if (len >= 48 && msg[0] >> 4 == 6) {
/* IPv6 extension headers are not supported */
if (msg[6] != 17)
return 0;
memcpy(&addr.in6.sin6_addr.s6_addr, msg + 24, 16);
addr.in6.sin6_port = *(uint16_t *)(msg + 40 + 2);
addr.in6.sin6_family = AF_INET6;
len -= 48, msg += 48;
#endif
} else {
return 0;
}
UTI_SockaddrToIPAndPort(&addr.u, &remote_addr->ip_addr, &remote_addr->port);
/* Move the message to fix alignment of its fields */
if (len > 0)
memmove(msg_start, msg, len);
return len;
}
/* ================================================== */
int
NIO_Linux_ProcessMessage(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
NTP_Local_Timestamp *local_ts, struct msghdr *hdr,
int length, int sock_fd, int if_index)
{
struct Interface *iface;
struct cmsghdr *cmsg;
int is_tx, l2_length;
is_tx = hdr->msg_flags & MSG_ERRQUEUE;
iface = NULL;
for (cmsg = CMSG_FIRSTHDR(hdr); cmsg; cmsg = CMSG_NXTHDR(hdr, cmsg)) {
if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_TIMESTAMPING) {
struct scm_timestamping ts3;
memcpy(&ts3, CMSG_DATA(cmsg), sizeof (ts3));
if (!UTI_IsZeroTimespec(&ts3.ts[0])) {
LCL_CookTime(&ts3.ts[0], &local_ts->ts, &local_ts->err);
local_ts->source = NTP_TS_KERNEL;
} else if (!UTI_IsZeroTimespec(&ts3.ts[2])) {
iface = get_interface(if_index);
if (iface) {
process_hw_timestamp(iface, &ts3.ts[2], local_ts, !is_tx ? length : 0,
remote_addr->ip_addr.family);
} else {
DEBUG_LOG(LOGF_NtpIOLinux, "HW clock not found for interface %d", if_index);
}
}
}
if ((cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR) ||
(cmsg->cmsg_level == SOL_IPV6 && cmsg->cmsg_type == IPV6_RECVERR)) {
struct sock_extended_err err;
memcpy(&err, CMSG_DATA(cmsg), sizeof (err));
if (err.ee_errno != ENOMSG || err.ee_info != SCM_TSTAMP_SND ||
err.ee_origin != SO_EE_ORIGIN_TIMESTAMPING) {
DEBUG_LOG(LOGF_NtpIOLinux, "Unknown extended error");
/* Drop the message */
return 1;
}
}
}
/* Return the message if it's not received from the error queue */
if (!is_tx)
return 0;
/* The data from the error queue includes all layers up to UDP. We have to
extract the UDP data and also the destination address with port as there
currently doesn't seem to be a better way to get them both. */
l2_length = length;
length = extract_udp_data(hdr->msg_iov[0].iov_base, remote_addr, length);
DEBUG_LOG(LOGF_NtpIOLinux, "Received %d (%d) bytes from error queue for %s:%d fd=%d if=%d tss=%d",
l2_length, length, UTI_IPToString(&remote_addr->ip_addr), remote_addr->port,
sock_fd, if_index, local_ts->source);
/* Update assumed position of UDP data at layer 2 for next received packet */
if (iface && length) {
if (remote_addr->ip_addr.family == IPADDR_INET4)
iface->l2_udp4_ntp_start = l2_length - length;
else if (remote_addr->ip_addr.family == IPADDR_INET6)
iface->l2_udp6_ntp_start = l2_length - length;
}
/* Drop the message if HW timestamp is missing or its processing failed */
if ((ts_flags & SOF_TIMESTAMPING_RAW_HARDWARE) && local_ts->source != NTP_TS_HARDWARE) {
DEBUG_LOG(LOGF_NtpIOLinux, "Missing HW timestamp");
return 1;
}
if (length < NTP_NORMAL_PACKET_LENGTH)
return 1;
NSR_ProcessTx(remote_addr, local_addr, local_ts,
(NTP_Packet *)hdr->msg_iov[0].iov_base, length);
return 1;
}
/* ================================================== */
int
NIO_Linux_RequestTxTimestamp(struct msghdr *msg, int cmsglen, int sock_fd)
{
struct cmsghdr *cmsg;
/* Check if TX timestamping is disabled on this socket */
if (permanent_ts_options || !NIO_IsServerSocket(sock_fd))
return cmsglen;
/* Add control message that will enable TX timestamping for this message.
Don't use CMSG_NXTHDR as the one in glibc is buggy for creating new
control messages. */
cmsg = (struct cmsghdr *)((char *)CMSG_FIRSTHDR(msg) + cmsglen);
memset(cmsg, 0, CMSG_SPACE(sizeof (ts_tx_flags)));
cmsglen += CMSG_SPACE(sizeof (ts_tx_flags));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SO_TIMESTAMPING;
cmsg->cmsg_len = CMSG_LEN(sizeof (ts_tx_flags));
memcpy(CMSG_DATA(cmsg), &ts_tx_flags, sizeof (ts_tx_flags));
return cmsglen;
}
|