summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/net/so_txtime.c
blob: 2672ac0b6d1f38c6112cee59da859b9a259ef165 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Test the SO_TXTIME API
 *
 * Takes a stream of { payload, delivery time }[], to be sent across two
 * processes. Start this program on two separate network namespaces or
 * connected hosts, one instance in transmit mode and the other in receive
 * mode using the '-r' option. Receiver will compare arrival timestamps to
 * the expected stream. Sender will read transmit timestamps from the error
 * queue. The streams can differ due to out-of-order delivery and drops.
 */

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <error.h>
#include <errno.h>
#include <inttypes.h>
#include <linux/net_tstamp.h>
#include <linux/errqueue.h>
#include <linux/if_ether.h>
#include <linux/ipv6.h>
#include <linux/udp.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <poll.h>

static int	cfg_clockid	= CLOCK_TAI;
static uint16_t	cfg_port	= 8000;
static int	cfg_variance_us	= 4000;
static uint64_t	cfg_start_time_ns;
static int	cfg_mark;
static bool	cfg_rx;

static uint64_t glob_tstart;
static uint64_t tdeliver_max;

/* encode one timed transmission (of a 1B payload) */
struct timed_send {
	char	data;
	int64_t	delay_us;
};

#define MAX_NUM_PKT	8
static struct timed_send cfg_buf[MAX_NUM_PKT];
static int cfg_num_pkt;

static int cfg_errq_level;
static int cfg_errq_type;

static struct sockaddr_storage cfg_dst_addr;
static struct sockaddr_storage cfg_src_addr;
static socklen_t cfg_alen;

static uint64_t gettime_ns(clockid_t clock)
{
	struct timespec ts;

	if (clock_gettime(clock, &ts))
		error(1, errno, "gettime");

	return ts.tv_sec * (1000ULL * 1000 * 1000) + ts.tv_nsec;
}

static void do_send_one(int fdt, struct timed_send *ts)
{
	char control[CMSG_SPACE(sizeof(uint64_t))];
	struct msghdr msg = {0};
	struct iovec iov = {0};
	struct cmsghdr *cm;
	uint64_t tdeliver;
	int ret;

	iov.iov_base = &ts->data;
	iov.iov_len = 1;

	msg.msg_iov = &iov;
	msg.msg_iovlen = 1;
	msg.msg_name = (struct sockaddr *)&cfg_dst_addr;
	msg.msg_namelen = cfg_alen;

	if (ts->delay_us >= 0) {
		memset(control, 0, sizeof(control));
		msg.msg_control = &control;
		msg.msg_controllen = sizeof(control);

		tdeliver = glob_tstart + ts->delay_us * 1000;
		tdeliver_max = tdeliver_max > tdeliver ?
			       tdeliver_max : tdeliver;

		cm = CMSG_FIRSTHDR(&msg);
		cm->cmsg_level = SOL_SOCKET;
		cm->cmsg_type = SCM_TXTIME;
		cm->cmsg_len = CMSG_LEN(sizeof(tdeliver));
		memcpy(CMSG_DATA(cm), &tdeliver, sizeof(tdeliver));
	}

	ret = sendmsg(fdt, &msg, 0);
	if (ret == -1)
		error(1, errno, "write");
	if (ret == 0)
		error(1, 0, "write: 0B");

}

static void do_recv_one(int fdr, struct timed_send *ts)
{
	int64_t tstop, texpect;
	char rbuf[2];
	int ret;

	ret = recv(fdr, rbuf, sizeof(rbuf), 0);
	if (ret == -1 && errno == EAGAIN)
		error(1, EAGAIN, "recv: timeout");
	if (ret == -1)
		error(1, errno, "read");
	if (ret != 1)
		error(1, 0, "read: %dB", ret);

	tstop = (gettime_ns(cfg_clockid) - glob_tstart) / 1000;
	texpect = ts->delay_us >= 0 ? ts->delay_us : 0;

	fprintf(stderr, "payload:%c delay:%lld expected:%lld (us)\n",
			rbuf[0], (long long)tstop, (long long)texpect);

	if (rbuf[0] != ts->data)
		error(1, 0, "payload mismatch. expected %c", ts->data);

	if (llabs(tstop - texpect) > cfg_variance_us)
		error(1, 0, "exceeds variance (%d us)", cfg_variance_us);
}

static void do_recv_verify_empty(int fdr)
{
	char rbuf[1];
	int ret;

	ret = recv(fdr, rbuf, sizeof(rbuf), 0);
	if (ret != -1 || errno != EAGAIN)
		error(1, 0, "recv: not empty as expected (%d, %d)", ret, errno);
}

static int do_recv_errqueue_timeout(int fdt)
{
	char control[CMSG_SPACE(sizeof(struct sock_extended_err)) +
		     CMSG_SPACE(sizeof(struct sockaddr_in6))] = {0};
	char data[sizeof(struct ethhdr) + sizeof(struct ipv6hdr) +
		  sizeof(struct udphdr) + 1];
	struct sock_extended_err *err;
	int ret, num_tstamp = 0;
	struct msghdr msg = {0};
	struct iovec iov = {0};
	struct cmsghdr *cm;
	int64_t tstamp = 0;

	iov.iov_base = data;
	iov.iov_len = sizeof(data);

	msg.msg_iov = &iov;
	msg.msg_iovlen = 1;

	msg.msg_control = control;
	msg.msg_controllen = sizeof(control);

	while (1) {
		const char *reason;

		ret = recvmsg(fdt, &msg, MSG_ERRQUEUE);
		if (ret == -1 && errno == EAGAIN)
			break;
		if (ret == -1)
			error(1, errno, "errqueue");
		if (msg.msg_flags != MSG_ERRQUEUE)
			error(1, 0, "errqueue: flags 0x%x\n", msg.msg_flags);

		cm = CMSG_FIRSTHDR(&msg);
		if (cm->cmsg_level != cfg_errq_level ||
		    cm->cmsg_type != cfg_errq_type)
			error(1, 0, "errqueue: type 0x%x.0x%x\n",
				    cm->cmsg_level, cm->cmsg_type);

		err = (struct sock_extended_err *)CMSG_DATA(cm);
		if (err->ee_origin != SO_EE_ORIGIN_TXTIME)
			error(1, 0, "errqueue: origin 0x%x\n", err->ee_origin);

		switch (err->ee_errno) {
		case ECANCELED:
			if (err->ee_code != SO_EE_CODE_TXTIME_MISSED)
				error(1, 0, "errqueue: unknown ECANCELED %u\n",
				      err->ee_code);
			reason = "missed txtime";
		break;
		case EINVAL:
			if (err->ee_code != SO_EE_CODE_TXTIME_INVALID_PARAM)
				error(1, 0, "errqueue: unknown EINVAL %u\n",
				      err->ee_code);
			reason = "invalid txtime";
		break;
		default:
			error(1, 0, "errqueue: errno %u code %u\n",
			      err->ee_errno, err->ee_code);
		}

		tstamp = ((int64_t) err->ee_data) << 32 | err->ee_info;
		tstamp -= (int64_t) glob_tstart;
		tstamp /= 1000 * 1000;
		fprintf(stderr, "send: pkt %c at %" PRId64 "ms dropped: %s\n",
			data[ret - 1], tstamp, reason);

		msg.msg_flags = 0;
		msg.msg_controllen = sizeof(control);
		num_tstamp++;
	}

	return num_tstamp;
}

static void recv_errqueue_msgs(int fdt)
{
	struct pollfd pfd = { .fd = fdt, .events = POLLERR };
	const int timeout_ms = 10;
	int ret, num_tstamp = 0;

	do {
		ret = poll(&pfd, 1, timeout_ms);
		if (ret == -1)
			error(1, errno, "poll");

		if (ret && (pfd.revents & POLLERR))
			num_tstamp += do_recv_errqueue_timeout(fdt);

		if (num_tstamp == cfg_num_pkt)
			break;

	} while (gettime_ns(cfg_clockid) < tdeliver_max);
}

static void start_time_wait(void)
{
	uint64_t now;
	int err;

	if (!cfg_start_time_ns)
		return;

	now = gettime_ns(CLOCK_REALTIME);
	if (cfg_start_time_ns < now)
		return;

	err = usleep((cfg_start_time_ns - now) / 1000);
	if (err)
		error(1, errno, "usleep");
}

static void setsockopt_txtime(int fd)
{
	struct sock_txtime so_txtime_val = { .clockid = cfg_clockid };
	struct sock_txtime so_txtime_val_read = { 0 };
	socklen_t vallen = sizeof(so_txtime_val);

	so_txtime_val.flags = SOF_TXTIME_REPORT_ERRORS;

	if (setsockopt(fd, SOL_SOCKET, SO_TXTIME,
		       &so_txtime_val, sizeof(so_txtime_val)))
		error(1, errno, "setsockopt txtime");

	if (getsockopt(fd, SOL_SOCKET, SO_TXTIME,
		       &so_txtime_val_read, &vallen))
		error(1, errno, "getsockopt txtime");

	if (vallen != sizeof(so_txtime_val) ||
	    memcmp(&so_txtime_val, &so_txtime_val_read, vallen))
		error(1, 0, "getsockopt txtime: mismatch");
}

static int setup_tx(struct sockaddr *addr, socklen_t alen)
{
	int fd;

	fd = socket(addr->sa_family, SOCK_DGRAM, 0);
	if (fd == -1)
		error(1, errno, "socket t");

	if (connect(fd, addr, alen))
		error(1, errno, "connect");

	setsockopt_txtime(fd);

	if (cfg_mark &&
	    setsockopt(fd, SOL_SOCKET, SO_MARK, &cfg_mark, sizeof(cfg_mark)))
		error(1, errno, "setsockopt mark");

	return fd;
}

static int setup_rx(struct sockaddr *addr, socklen_t alen)
{
	struct timeval tv = { .tv_usec = 100 * 1000 };
	int fd;

	fd = socket(addr->sa_family, SOCK_DGRAM, 0);
	if (fd == -1)
		error(1, errno, "socket r");

	if (bind(fd, addr, alen))
		error(1, errno, "bind");

	if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)))
		error(1, errno, "setsockopt rcv timeout");

	return fd;
}

static void do_test_tx(struct sockaddr *addr, socklen_t alen)
{
	int fdt, i;

	fprintf(stderr, "\nSO_TXTIME ipv%c clock %s\n",
			addr->sa_family == PF_INET ? '4' : '6',
			cfg_clockid == CLOCK_TAI ? "tai" : "monotonic");

	fdt = setup_tx(addr, alen);

	start_time_wait();
	glob_tstart = gettime_ns(cfg_clockid);

	for (i = 0; i < cfg_num_pkt; i++)
		do_send_one(fdt, &cfg_buf[i]);

	recv_errqueue_msgs(fdt);

	if (close(fdt))
		error(1, errno, "close t");
}

static void do_test_rx(struct sockaddr *addr, socklen_t alen)
{
	int fdr, i;

	fdr = setup_rx(addr, alen);

	start_time_wait();
	glob_tstart = gettime_ns(cfg_clockid);

	for (i = 0; i < cfg_num_pkt; i++)
		do_recv_one(fdr, &cfg_buf[i]);

	do_recv_verify_empty(fdr);

	if (close(fdr))
		error(1, errno, "close r");
}

static void setup_sockaddr(int domain, const char *str_addr,
			   struct sockaddr_storage *sockaddr)
{
	struct sockaddr_in6 *addr6 = (void *) sockaddr;
	struct sockaddr_in *addr4 = (void *) sockaddr;

	switch (domain) {
	case PF_INET:
		memset(addr4, 0, sizeof(*addr4));
		addr4->sin_family = AF_INET;
		addr4->sin_port = htons(cfg_port);
		if (str_addr &&
		    inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1)
			error(1, 0, "ipv4 parse error: %s", str_addr);
		break;
	case PF_INET6:
		memset(addr6, 0, sizeof(*addr6));
		addr6->sin6_family = AF_INET6;
		addr6->sin6_port = htons(cfg_port);
		if (str_addr &&
		    inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1)
			error(1, 0, "ipv6 parse error: %s", str_addr);
		break;
	}
}

static int parse_io(const char *optarg, struct timed_send *array)
{
	char *arg, *tok;
	int aoff = 0;

	arg = strdup(optarg);
	if (!arg)
		error(1, errno, "strdup");

	while ((tok = strtok(arg, ","))) {
		arg = NULL;	/* only pass non-zero on first call */

		if (aoff / 2 == MAX_NUM_PKT)
			error(1, 0, "exceeds max pkt count (%d)", MAX_NUM_PKT);

		if (aoff & 1) {	/* parse delay */
			array->delay_us = strtol(tok, NULL, 0) * 1000;
			array++;
		} else {	/* parse character */
			array->data = tok[0];
		}

		aoff++;
	}

	free(arg);

	return aoff / 2;
}

static void usage(const char *progname)
{
	fprintf(stderr, "\nUsage: %s [options] <payload>\n"
			"Options:\n"
			"  -4            only IPv4\n"
			"  -6            only IPv6\n"
			"  -c <clock>    monotonic or tai (default)\n"
			"  -D <addr>     destination IP address (server)\n"
			"  -S <addr>     source IP address (client)\n"
			"  -r            run rx mode\n"
			"  -t <nsec>     start time (UTC nanoseconds)\n"
			"  -m <mark>     socket mark\n"
			"\n",
			progname);
	exit(1);
}

static void parse_opts(int argc, char **argv)
{
	char *daddr = NULL, *saddr = NULL;
	int domain = PF_UNSPEC;
	int c;

	while ((c = getopt(argc, argv, "46c:S:D:rt:m:")) != -1) {
		switch (c) {
		case '4':
			if (domain != PF_UNSPEC)
				error(1, 0, "Pass one of -4 or -6");
			domain = PF_INET;
			cfg_alen = sizeof(struct sockaddr_in);
			cfg_errq_level = SOL_IP;
			cfg_errq_type = IP_RECVERR;
			break;
		case '6':
			if (domain != PF_UNSPEC)
				error(1, 0, "Pass one of -4 or -6");
			domain = PF_INET6;
			cfg_alen = sizeof(struct sockaddr_in6);
			cfg_errq_level = SOL_IPV6;
			cfg_errq_type = IPV6_RECVERR;
			break;
		case 'c':
			if (!strcmp(optarg, "tai"))
				cfg_clockid = CLOCK_TAI;
			else if (!strcmp(optarg, "monotonic") ||
				 !strcmp(optarg, "mono"))
				cfg_clockid = CLOCK_MONOTONIC;
			else
				error(1, 0, "unknown clock id %s", optarg);
			break;
		case 'S':
			saddr = optarg;
			break;
		case 'D':
			daddr = optarg;
			break;
		case 'r':
			cfg_rx = true;
			break;
		case 't':
			cfg_start_time_ns = strtoll(optarg, NULL, 0);
			break;
		case 'm':
			cfg_mark = strtol(optarg, NULL, 0);
			break;
		default:
			usage(argv[0]);
		}
	}

	if (argc - optind != 1)
		usage(argv[0]);

	if (domain == PF_UNSPEC)
		error(1, 0, "Pass one of -4 or -6");
	if (!daddr)
		error(1, 0, "-D <server addr> required\n");
	if (!cfg_rx && !saddr)
		error(1, 0, "-S <client addr> required\n");

	setup_sockaddr(domain, daddr, &cfg_dst_addr);
	setup_sockaddr(domain, saddr, &cfg_src_addr);

	cfg_num_pkt = parse_io(argv[optind], cfg_buf);
}

int main(int argc, char **argv)
{
	parse_opts(argc, argv);

	if (cfg_rx)
		do_test_rx((void *)&cfg_dst_addr, cfg_alen);
	else
		do_test_tx((void *)&cfg_src_addr, cfg_alen);

	return 0;
}