summaryrefslogtreecommitdiffstats
path: root/kernel/Documentation/networking/timestamping/timestamping.c
blob: 5cdfd743447b72b465ffbff763a4981f3126a02f (plain)
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
/*
 * This program demonstrates how the various time stamping features in
 * the Linux kernel work. It emulates the behavior of a PTP
 * implementation in stand-alone master mode by sending PTPv1 Sync
 * multicasts once every second. It looks for similar packets, but
 * beyond that doesn't actually implement PTP.
 *
 * Outgoing packets are time stamped with SO_TIMESTAMPING with or
 * without hardware support.
 *
 * Incoming packets are time stamped with SO_TIMESTAMPING with or
 * without hardware support, SIOCGSTAMP[NS] (per-socket time stamp) and
 * SO_TIMESTAMP[NS].
 *
 * Copyright (C) 2009 Intel Corporation.
 * Author: Patrick Ohly <patrick.ohly@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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 St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

#include <sys/time.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <net/if.h>

#include <asm/types.h>
#include <linux/net_tstamp.h>
#include <linux/errqueue.h>

#ifndef SO_TIMESTAMPING
# define SO_TIMESTAMPING         37
# define SCM_TIMESTAMPING        SO_TIMESTAMPING
#endif

#ifndef SO_TIMESTAMPNS
# define SO_TIMESTAMPNS 35
#endif

#ifndef SIOCGSTAMPNS
# define SIOCGSTAMPNS 0x8907
#endif

#ifndef SIOCSHWTSTAMP
# define SIOCSHWTSTAMP 0x89b0
#endif

static void usage(const char *error)
{
	if (error)
		printf("invalid option: %s\n", error);
	printf("timestamping interface option*\n\n"
	       "Options:\n"
	       "  IP_MULTICAST_LOOP - looping outgoing multicasts\n"
	       "  SO_TIMESTAMP - normal software time stamping, ms resolution\n"
	       "  SO_TIMESTAMPNS - more accurate software time stamping\n"
	       "  SOF_TIMESTAMPING_TX_HARDWARE - hardware time stamping of outgoing packets\n"
	       "  SOF_TIMESTAMPING_TX_SOFTWARE - software fallback for outgoing packets\n"
	       "  SOF_TIMESTAMPING_RX_HARDWARE - hardware time stamping of incoming packets\n"
	       "  SOF_TIMESTAMPING_RX_SOFTWARE - software fallback for incoming packets\n"
	       "  SOF_TIMESTAMPING_SOFTWARE - request reporting of software time stamps\n"
	       "  SOF_TIMESTAMPING_RAW_HARDWARE - request reporting of raw HW time stamps\n"
	       "  SIOCGSTAMP - check last socket time stamp\n"
	       "  SIOCGSTAMPNS - more accurate socket time stamp\n");
	exit(1);
}

static void bail(const char *error)
{
	printf("%s: %s\n", error, strerror(errno));
	exit(1);
}

static const unsigned char sync[] = {
	0x00, 0x01, 0x00, 0x01,
	0x5f, 0x44, 0x46, 0x4c,
	0x54, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00,
	0x01, 0x01,

	/* fake uuid */
	0x00, 0x01,
	0x02, 0x03, 0x04, 0x05,

	0x00, 0x01, 0x00, 0x37,
	0x00, 0x00, 0x00, 0x08,
	0x00, 0x00, 0x00, 0x00,
	0x49, 0x05, 0xcd, 0x01,
	0x29, 0xb1, 0x8d, 0xb0,
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x01,

	/* fake uuid */
	0x00, 0x01,
	0x02, 0x03, 0x04, 0x05,

	0x00, 0x00, 0x00, 0x37,
	0x00, 0x00, 0x00, 0x04,
	0x44, 0x46, 0x4c, 0x54,
	0x00, 0x00, 0xf0, 0x60,
	0x00, 0x01, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x01,
	0x00, 0x00, 0xf0, 0x60,
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x04,
	0x44, 0x46, 0x4c, 0x54,
	0x00, 0x01,

	/* fake uuid */
	0x00, 0x01,
	0x02, 0x03, 0x04, 0x05,

	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00
};

static void sendpacket(int sock, struct sockaddr *addr, socklen_t addr_len)
{
	struct timeval now;
	int res;

	res = sendto(sock, sync, sizeof(sync), 0,
		addr, addr_len);
	gettimeofday(&now, 0);
	if (res < 0)
		printf("%s: %s\n", "send", strerror(errno));
	else
		printf("%ld.%06ld: sent %d bytes\n",
		       (long)now.tv_sec, (long)now.tv_usec,
		       res);
}

static void printpacket(struct msghdr *msg, int res,
			char *data,
			int sock, int recvmsg_flags,
			int siocgstamp, int siocgstampns)
{
	struct sockaddr_in *from_addr = (struct sockaddr_in *)msg->msg_name;
	struct cmsghdr *cmsg;
	struct timeval tv;
	struct timespec ts;
	struct timeval now;

	gettimeofday(&now, 0);

	printf("%ld.%06ld: received %s data, %d bytes from %s, %zu bytes control messages\n",
	       (long)now.tv_sec, (long)now.tv_usec,
	       (recvmsg_flags & MSG_ERRQUEUE) ? "error" : "regular",
	       res,
	       inet_ntoa(from_addr->sin_addr),
	       msg->msg_controllen);
	for (cmsg = CMSG_FIRSTHDR(msg);
	     cmsg;
	     cmsg = CMSG_NXTHDR(msg, cmsg)) {
		printf("   cmsg len %zu: ", cmsg->cmsg_len);
		switch (cmsg->cmsg_level) {
		case SOL_SOCKET:
			printf("SOL_SOCKET ");
			switch (cmsg->cmsg_type) {
			case SO_TIMESTAMP: {
				struct timeval *stamp =
					(struct timeval *)CMSG_DATA(cmsg);
				printf("SO_TIMESTAMP %ld.%06ld",
				       (long)stamp->tv_sec,
				       (long)stamp->tv_usec);
				break;
			}
			case SO_TIMESTAMPNS: {
				struct timespec *stamp =
					(struct timespec *)CMSG_DATA(cmsg);
				printf("SO_TIMESTAMPNS %ld.%09ld",
				       (long)stamp->tv_sec,
				       (long)stamp->tv_nsec);
				break;
			}
			case SO_TIMESTAMPING: {
				struct timespec *stamp =
					(struct timespec *)CMSG_DATA(cmsg);
				printf("SO_TIMESTAMPING ");
				printf("SW %ld.%09ld ",
				       (long)stamp->tv_sec,
				       (long)stamp->tv_nsec);
				stamp++;
				/* skip deprecated HW transformed */
				stamp++;
				printf("HW raw %ld.%09ld",
				       (long)stamp->tv_sec,
				       (long)stamp->tv_nsec);
				break;
			}
			default:
				printf("type %d", cmsg->cmsg_type);
				break;
			}
			break;
		case IPPROTO_IP:
			printf("IPPROTO_IP ");
			switch (cmsg->cmsg_type) {
			case IP_RECVERR: {
				struct sock_extended_err *err =
					(struct sock_extended_err *)CMSG_DATA(cmsg);
				printf("IP_RECVERR ee_errno '%s' ee_origin %d => %s",
					strerror(err->ee_errno),
					err->ee_origin,
#ifdef SO_EE_ORIGIN_TIMESTAMPING
					err->ee_origin == SO_EE_ORIGIN_TIMESTAMPING ?
					"bounced packet" : "unexpected origin"
#else
					"probably SO_EE_ORIGIN_TIMESTAMPING"
#endif
					);
				if (res < sizeof(sync))
					printf(" => truncated data?!");
				else if (!memcmp(sync, data + res - sizeof(sync),
							sizeof(sync)))
					printf(" => GOT OUR DATA BACK (HURRAY!)");
				break;
			}
			case IP_PKTINFO: {
				struct in_pktinfo *pktinfo =
					(struct in_pktinfo *)CMSG_DATA(cmsg);
				printf("IP_PKTINFO interface index %u",
					pktinfo->ipi_ifindex);
				break;
			}
			default:
				printf("type %d", cmsg->cmsg_type);
				break;
			}
			break;
		default:
			printf("level %d type %d",
				cmsg->cmsg_level,
				cmsg->cmsg_type);
			break;
		}
		printf("\n");
	}

	if (siocgstamp) {
		if (ioctl(sock, SIOCGSTAMP, &tv))
			printf("   %s: %s\n", "SIOCGSTAMP", strerror(errno));
		else
			printf("SIOCGSTAMP %ld.%06ld\n",
			       (long)tv.tv_sec,
			       (long)tv.tv_usec);
	}
	if (siocgstampns) {
		if (ioctl(sock, SIOCGSTAMPNS, &ts))
			printf("   %s: %s\n", "SIOCGSTAMPNS", strerror(errno));
		else
			printf("SIOCGSTAMPNS %ld.%09ld\n",
			       (long)ts.tv_sec,
			       (long)ts.tv_nsec);
	}
}

static void recvpacket(int sock, int recvmsg_flags,
		       int siocgstamp, int siocgstampns)
{
	char data[256];
	struct msghdr msg;
	struct iovec entry;
	struct sockaddr_in from_addr;
	struct {
		struct cmsghdr cm;
		char control[512];
	} control;
	int res;

	memset(&msg, 0, sizeof(msg));
	msg.msg_iov = &entry;
	msg.msg_iovlen = 1;
	entry.iov_base = data;
	entry.iov_len = sizeof(data);
	msg.msg_name = (caddr_t)&from_addr;
	msg.msg_namelen = sizeof(from_addr);
	msg.msg_control = &control;
	msg.msg_controllen = sizeof(control);

	res = recvmsg(sock, &msg, recvmsg_flags|MSG_DONTWAIT);
	if (res < 0) {
		printf("%s %s: %s\n",
		       "recvmsg",
		       (recvmsg_flags & MSG_ERRQUEUE) ? "error" : "regular",
		       strerror(errno));
	} else {
		printpacket(&msg, res, data,
			    sock, recvmsg_flags,
			    siocgstamp, siocgstampns);
	}
}

int main(int argc, char **argv)
{
	int so_timestamping_flags = 0;
	int so_timestamp = 0;
	int so_timestampns = 0;
	int siocgstamp = 0;
	int siocgstampns = 0;
	int ip_multicast_loop = 0;
	char *interface;
	int i;
	int enabled = 1;
	int sock;
	struct ifreq device;
	struct ifreq hwtstamp;
	struct hwtstamp_config hwconfig, hwconfig_requested;
	struct sockaddr_in addr;
	struct ip_mreq imr;
	struct in_addr iaddr;
	int val;
	socklen_t len;
	struct timeval next;

	if (argc < 2)
		usage(0);
	interface = argv[1];

	for (i = 2; i < argc; i++) {
		if (!strcasecmp(argv[i], "SO_TIMESTAMP"))
			so_timestamp = 1;
		else if (!strcasecmp(argv[i], "SO_TIMESTAMPNS"))
			so_timestampns = 1;
		else if (!strcasecmp(argv[i], "SIOCGSTAMP"))
			siocgstamp = 1;
		else if (!strcasecmp(argv[i], "SIOCGSTAMPNS"))
			siocgstampns = 1;
		else if (!strcasecmp(argv[i], "IP_MULTICAST_LOOP"))
			ip_multicast_loop = 1;
		else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_TX_HARDWARE"))
			so_timestamping_flags |= SOF_TIMESTAMPING_TX_HARDWARE;
		else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_TX_SOFTWARE"))
			so_timestamping_flags |= SOF_TIMESTAMPING_TX_SOFTWARE;
		else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_RX_HARDWARE"))
			so_timestamping_flags |= SOF_TIMESTAMPING_RX_HARDWARE;
		else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_RX_SOFTWARE"))
			so_timestamping_flags |= SOF_TIMESTAMPING_RX_SOFTWARE;
		else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_SOFTWARE"))
			so_timestamping_flags |= SOF_TIMESTAMPING_SOFTWARE;
		else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_RAW_HARDWARE"))
			so_timestamping_flags |= SOF_TIMESTAMPING_RAW_HARDWARE;
		else
			usage(argv[i]);
	}

	sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (sock < 0)
		bail("socket");

	memset(&device, 0, sizeof(device));
	strncpy(device.ifr_name, interface, sizeof(device.ifr_name));
	if (ioctl(sock, SIOCGIFADDR, &device) < 0)
		bail("getting interface IP address");

	memset(&hwtstamp, 0, sizeof(hwtstamp));
	strncpy(hwtstamp.ifr_name, interface, sizeof(hwtstamp.ifr_name));
	hwtstamp.ifr_data = (void *)&hwconfig;
	memset(&hwconfig, 0, sizeof(hwconfig));
	hwconfig.tx_type =
		(so_timestamping_flags & SOF_TIMESTAMPING_TX_HARDWARE) ?
		HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF;
	hwconfig.rx_filter =
		(so_timestamping_flags & SOF_TIMESTAMPING_RX_HARDWARE) ?
		HWTSTAMP_FILTER_PTP_V1_L4_SYNC : HWTSTAMP_FILTER_NONE;
	hwconfig_requested = hwconfig;
	if (ioctl(sock, SIOCSHWTSTAMP, &hwtstamp) < 0) {
		if ((errno == EINVAL || errno == ENOTSUP) &&
		    hwconfig_requested.tx_type == HWTSTAMP_TX_OFF &&
		    hwconfig_requested.rx_filter == HWTSTAMP_FILTER_NONE)
			printf("SIOCSHWTSTAMP: disabling hardware time stamping not possible\n");
		else
			bail("SIOCSHWTSTAMP");
	}
	printf("SIOCSHWTSTAMP: tx_type %d requested, got %d; rx_filter %d requested, got %d\n",
	       hwconfig_requested.tx_type, hwconfig.tx_type,
	       hwconfig_requested.rx_filter, hwconfig.rx_filter);

	/* bind to PTP port */
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = htonl(INADDR_ANY);
	addr.sin_port = htons(319 /* PTP event port */);
	if (bind(sock,
		 (struct sockaddr *)&addr,
		 sizeof(struct sockaddr_in)) < 0)
		bail("bind");

	/* set multicast group for outgoing packets */
	inet_aton("224.0.1.130", &iaddr); /* alternate PTP domain 1 */
	addr.sin_addr = iaddr;
	imr.imr_multiaddr.s_addr = iaddr.s_addr;
	imr.imr_interface.s_addr =
		((struct sockaddr_in *)&device.ifr_addr)->sin_addr.s_addr;
	if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF,
		       &imr.imr_interface.s_addr, sizeof(struct in_addr)) < 0)
		bail("set multicast");

	/* join multicast group, loop our own packet */
	if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
		       &imr, sizeof(struct ip_mreq)) < 0)
		bail("join multicast group");

	if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_LOOP,
		       &ip_multicast_loop, sizeof(enabled)) < 0) {
		bail("loop multicast");
	}

	/* set socket options for time stamping */
	if (so_timestamp &&
		setsockopt(sock, SOL_SOCKET, SO_TIMESTAMP,
			   &enabled, sizeof(enabled)) < 0)
		bail("setsockopt SO_TIMESTAMP");

	if (so_timestampns &&
		setsockopt(sock, SOL_SOCKET, SO_TIMESTAMPNS,
			   &enabled, sizeof(enabled)) < 0)
		bail("setsockopt SO_TIMESTAMPNS");

	if (so_timestamping_flags &&
		setsockopt(sock, SOL_SOCKET, SO_TIMESTAMPING,
			   &so_timestamping_flags,
			   sizeof(so_timestamping_flags)) < 0)
		bail("setsockopt SO_TIMESTAMPING");

	/* request IP_PKTINFO for debugging purposes */
	if (setsockopt(sock, SOL_IP, IP_PKTINFO,
		       &enabled, sizeof(enabled)) < 0)
		printf("%s: %s\n", "setsockopt IP_PKTINFO", strerror(errno));

	/* verify socket options */
	len = sizeof(val);
	if (getsockopt(sock, SOL_SOCKET, SO_TIMESTAMP, &val, &len) < 0)
		printf("%s: %s\n", "getsockopt SO_TIMESTAMP", strerror(errno));
	else
		printf("SO_TIMESTAMP %d\n", val);

	if (getsockopt(sock, SOL_SOCKET, SO_TIMESTAMPNS, &val, &len) < 0)
		printf("%s: %s\n", "getsockopt SO_TIMESTAMPNS",
		       strerror(errno));
	else
		printf("SO_TIMESTAMPNS %d\n", val);

	if (getsockopt(sock, SOL_SOCKET, SO_TIMESTAMPING, &val, &len) < 0) {
		printf("%s: %s\n", "getsockopt SO_TIMESTAMPING",
		       strerror(errno));
	} else {
		printf("SO_TIMESTAMPING %d\n", val);
		if (val != so_timestamping_flags)
			printf("   not the expected value %d\n",
			       so_timestamping_flags);
	}

	/* send packets forever every five seconds */
	gettimeofday(&next, 0);
	next.tv_sec = (next.tv_sec + 1) / 5 * 5;
	next.tv_usec = 0;
	while (1) {
		struct timeval now;
		struct timeval delta;
		long delta_us;
		int res;
		fd_set readfs, errorfs;

		gettimeofday(&now, 0);
		delta_us = (long)(next.tv_sec - now.tv_sec) * 1000000 +
			(long)(next.tv_usec - now.tv_usec);
		if (delta_us > 0) {
			/* continue waiting for timeout or data */
			delta.tv_sec = delta_us / 1000000;
			delta.tv_usec = delta_us % 1000000;

			FD_ZERO(&readfs);
			FD_ZERO(&errorfs);
			FD_SET(sock, &readfs);
			FD_SET(sock, &errorfs);
			printf("%ld.%06ld: select %ldus\n",
			       (long)now.tv_sec, (long)now.tv_usec,
			       delta_us);
			res = select(sock + 1, &readfs, 0, &errorfs, &delta);
			gettimeofday(&now, 0);
			printf("%ld.%06ld: select returned: %d, %s\n",
			       (long)now.tv_sec, (long)now.tv_usec,
			       res,
			       res < 0 ? strerror(errno) : "success");
			if (res > 0) {
				if (FD_ISSET(sock, &readfs))
					printf("ready for reading\n");
				if (FD_ISSET(sock, &errorfs))
					printf("has error\n");
				recvpacket(sock, 0,
					   siocgstamp,
					   siocgstampns);
				recvpacket(sock, MSG_ERRQUEUE,
					   siocgstamp,
					   siocgstampns);
			}
		} else {
			/* write one packet */
			sendpacket(sock,
				   (struct sockaddr *)&addr,
				   sizeof(addr));
			next.tv_sec += 5;
			continue;
		}
	}

	return 0;
}