This source file includes following definitions.
- gettime_ns
- do_send_one
- do_recv_one
- do_recv_verify_empty
- do_recv_errqueue_timeout
- setsockopt_txtime
- setup_tx
- setup_rx
- do_test
- parse_io
- parse_opts
- main
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10 #define _GNU_SOURCE
11
12 #include <arpa/inet.h>
13 #include <error.h>
14 #include <errno.h>
15 #include <inttypes.h>
16 #include <linux/net_tstamp.h>
17 #include <linux/errqueue.h>
18 #include <linux/ipv6.h>
19 #include <linux/tcp.h>
20 #include <stdbool.h>
21 #include <stdlib.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <sys/socket.h>
25 #include <sys/stat.h>
26 #include <sys/time.h>
27 #include <sys/types.h>
28 #include <time.h>
29 #include <unistd.h>
30
31 static int cfg_clockid = CLOCK_TAI;
32 static bool cfg_do_ipv4;
33 static bool cfg_do_ipv6;
34 static uint16_t cfg_port = 8000;
35 static int cfg_variance_us = 4000;
36
37 static uint64_t glob_tstart;
38
39
40 struct timed_send {
41 char data;
42 int64_t delay_us;
43 };
44
45 #define MAX_NUM_PKT 8
46 static struct timed_send cfg_in[MAX_NUM_PKT];
47 static struct timed_send cfg_out[MAX_NUM_PKT];
48 static int cfg_num_pkt;
49
50 static int cfg_errq_level;
51 static int cfg_errq_type;
52
53 static uint64_t gettime_ns(void)
54 {
55 struct timespec ts;
56
57 if (clock_gettime(cfg_clockid, &ts))
58 error(1, errno, "gettime");
59
60 return ts.tv_sec * (1000ULL * 1000 * 1000) + ts.tv_nsec;
61 }
62
63 static void do_send_one(int fdt, struct timed_send *ts)
64 {
65 char control[CMSG_SPACE(sizeof(uint64_t))];
66 struct msghdr msg = {0};
67 struct iovec iov = {0};
68 struct cmsghdr *cm;
69 uint64_t tdeliver;
70 int ret;
71
72 iov.iov_base = &ts->data;
73 iov.iov_len = 1;
74
75 msg.msg_iov = &iov;
76 msg.msg_iovlen = 1;
77
78 if (ts->delay_us >= 0) {
79 memset(control, 0, sizeof(control));
80 msg.msg_control = &control;
81 msg.msg_controllen = sizeof(control);
82
83 tdeliver = glob_tstart + ts->delay_us * 1000;
84
85 cm = CMSG_FIRSTHDR(&msg);
86 cm->cmsg_level = SOL_SOCKET;
87 cm->cmsg_type = SCM_TXTIME;
88 cm->cmsg_len = CMSG_LEN(sizeof(tdeliver));
89 memcpy(CMSG_DATA(cm), &tdeliver, sizeof(tdeliver));
90 }
91
92 ret = sendmsg(fdt, &msg, 0);
93 if (ret == -1)
94 error(1, errno, "write");
95 if (ret == 0)
96 error(1, 0, "write: 0B");
97
98 }
99
100 static bool do_recv_one(int fdr, struct timed_send *ts)
101 {
102 int64_t tstop, texpect;
103 char rbuf[2];
104 int ret;
105
106 ret = recv(fdr, rbuf, sizeof(rbuf), 0);
107 if (ret == -1 && errno == EAGAIN)
108 return true;
109 if (ret == -1)
110 error(1, errno, "read");
111 if (ret != 1)
112 error(1, 0, "read: %dB", ret);
113
114 tstop = (gettime_ns() - glob_tstart) / 1000;
115 texpect = ts->delay_us >= 0 ? ts->delay_us : 0;
116
117 fprintf(stderr, "payload:%c delay:%lld expected:%lld (us)\n",
118 rbuf[0], (long long)tstop, (long long)texpect);
119
120 if (rbuf[0] != ts->data)
121 error(1, 0, "payload mismatch. expected %c", ts->data);
122
123 if (labs(tstop - texpect) > cfg_variance_us)
124 error(1, 0, "exceeds variance (%d us)", cfg_variance_us);
125
126 return false;
127 }
128
129 static void do_recv_verify_empty(int fdr)
130 {
131 char rbuf[1];
132 int ret;
133
134 ret = recv(fdr, rbuf, sizeof(rbuf), 0);
135 if (ret != -1 || errno != EAGAIN)
136 error(1, 0, "recv: not empty as expected (%d, %d)", ret, errno);
137 }
138
139 static void do_recv_errqueue_timeout(int fdt)
140 {
141 char control[CMSG_SPACE(sizeof(struct sock_extended_err)) +
142 CMSG_SPACE(sizeof(struct sockaddr_in6))] = {0};
143 char data[sizeof(struct ipv6hdr) +
144 sizeof(struct tcphdr) + 1];
145 struct sock_extended_err *err;
146 struct msghdr msg = {0};
147 struct iovec iov = {0};
148 struct cmsghdr *cm;
149 int64_t tstamp = 0;
150 int ret;
151
152 iov.iov_base = data;
153 iov.iov_len = sizeof(data);
154
155 msg.msg_iov = &iov;
156 msg.msg_iovlen = 1;
157
158 msg.msg_control = control;
159 msg.msg_controllen = sizeof(control);
160
161 while (1) {
162 ret = recvmsg(fdt, &msg, MSG_ERRQUEUE);
163 if (ret == -1 && errno == EAGAIN)
164 break;
165 if (ret == -1)
166 error(1, errno, "errqueue");
167 if (msg.msg_flags != MSG_ERRQUEUE)
168 error(1, 0, "errqueue: flags 0x%x\n", msg.msg_flags);
169
170 cm = CMSG_FIRSTHDR(&msg);
171 if (cm->cmsg_level != cfg_errq_level ||
172 cm->cmsg_type != cfg_errq_type)
173 error(1, 0, "errqueue: type 0x%x.0x%x\n",
174 cm->cmsg_level, cm->cmsg_type);
175
176 err = (struct sock_extended_err *)CMSG_DATA(cm);
177 if (err->ee_origin != SO_EE_ORIGIN_TXTIME)
178 error(1, 0, "errqueue: origin 0x%x\n", err->ee_origin);
179 if (err->ee_code != ECANCELED)
180 error(1, 0, "errqueue: code 0x%x\n", err->ee_code);
181
182 tstamp = ((int64_t) err->ee_data) << 32 | err->ee_info;
183 tstamp -= (int64_t) glob_tstart;
184 tstamp /= 1000 * 1000;
185 fprintf(stderr, "send: pkt %c at %" PRId64 "ms dropped\n",
186 data[ret - 1], tstamp);
187
188 msg.msg_flags = 0;
189 msg.msg_controllen = sizeof(control);
190 }
191
192 error(1, 0, "recv: timeout");
193 }
194
195 static void setsockopt_txtime(int fd)
196 {
197 struct sock_txtime so_txtime_val = { .clockid = cfg_clockid };
198 struct sock_txtime so_txtime_val_read = { 0 };
199 socklen_t vallen = sizeof(so_txtime_val);
200
201 so_txtime_val.flags = SOF_TXTIME_REPORT_ERRORS;
202
203 if (setsockopt(fd, SOL_SOCKET, SO_TXTIME,
204 &so_txtime_val, sizeof(so_txtime_val)))
205 error(1, errno, "setsockopt txtime");
206
207 if (getsockopt(fd, SOL_SOCKET, SO_TXTIME,
208 &so_txtime_val_read, &vallen))
209 error(1, errno, "getsockopt txtime");
210
211 if (vallen != sizeof(so_txtime_val) ||
212 memcmp(&so_txtime_val, &so_txtime_val_read, vallen))
213 error(1, 0, "getsockopt txtime: mismatch");
214 }
215
216 static int setup_tx(struct sockaddr *addr, socklen_t alen)
217 {
218 int fd;
219
220 fd = socket(addr->sa_family, SOCK_DGRAM, 0);
221 if (fd == -1)
222 error(1, errno, "socket t");
223
224 if (connect(fd, addr, alen))
225 error(1, errno, "connect");
226
227 setsockopt_txtime(fd);
228
229 return fd;
230 }
231
232 static int setup_rx(struct sockaddr *addr, socklen_t alen)
233 {
234 struct timeval tv = { .tv_usec = 100 * 1000 };
235 int fd;
236
237 fd = socket(addr->sa_family, SOCK_DGRAM, 0);
238 if (fd == -1)
239 error(1, errno, "socket r");
240
241 if (bind(fd, addr, alen))
242 error(1, errno, "bind");
243
244 if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)))
245 error(1, errno, "setsockopt rcv timeout");
246
247 return fd;
248 }
249
250 static void do_test(struct sockaddr *addr, socklen_t alen)
251 {
252 int fdt, fdr, i;
253
254 fprintf(stderr, "\nSO_TXTIME ipv%c clock %s\n",
255 addr->sa_family == PF_INET ? '4' : '6',
256 cfg_clockid == CLOCK_TAI ? "tai" : "monotonic");
257
258 fdt = setup_tx(addr, alen);
259 fdr = setup_rx(addr, alen);
260
261 glob_tstart = gettime_ns();
262
263 for (i = 0; i < cfg_num_pkt; i++)
264 do_send_one(fdt, &cfg_in[i]);
265 for (i = 0; i < cfg_num_pkt; i++)
266 if (do_recv_one(fdr, &cfg_out[i]))
267 do_recv_errqueue_timeout(fdt);
268
269 do_recv_verify_empty(fdr);
270
271 if (close(fdr))
272 error(1, errno, "close r");
273 if (close(fdt))
274 error(1, errno, "close t");
275 }
276
277 static int parse_io(const char *optarg, struct timed_send *array)
278 {
279 char *arg, *tok;
280 int aoff = 0;
281
282 arg = strdup(optarg);
283 if (!arg)
284 error(1, errno, "strdup");
285
286 while ((tok = strtok(arg, ","))) {
287 arg = NULL;
288
289 if (aoff / 2 == MAX_NUM_PKT)
290 error(1, 0, "exceeds max pkt count (%d)", MAX_NUM_PKT);
291
292 if (aoff & 1) {
293 array->delay_us = strtol(tok, NULL, 0) * 1000;
294 array++;
295 } else {
296 array->data = tok[0];
297 }
298
299 aoff++;
300 }
301
302 free(arg);
303
304 return aoff / 2;
305 }
306
307 static void parse_opts(int argc, char **argv)
308 {
309 int c, ilen, olen;
310
311 while ((c = getopt(argc, argv, "46c:")) != -1) {
312 switch (c) {
313 case '4':
314 cfg_do_ipv4 = true;
315 break;
316 case '6':
317 cfg_do_ipv6 = true;
318 break;
319 case 'c':
320 if (!strcmp(optarg, "tai"))
321 cfg_clockid = CLOCK_TAI;
322 else if (!strcmp(optarg, "monotonic") ||
323 !strcmp(optarg, "mono"))
324 cfg_clockid = CLOCK_MONOTONIC;
325 else
326 error(1, 0, "unknown clock id %s", optarg);
327 break;
328 default:
329 error(1, 0, "parse error at %d", optind);
330 }
331 }
332
333 if (argc - optind != 2)
334 error(1, 0, "Usage: %s [-46] -c <clock> <in> <out>", argv[0]);
335
336 ilen = parse_io(argv[optind], cfg_in);
337 olen = parse_io(argv[optind + 1], cfg_out);
338 if (ilen != olen)
339 error(1, 0, "i/o streams len mismatch (%d, %d)\n", ilen, olen);
340 cfg_num_pkt = ilen;
341 }
342
343 int main(int argc, char **argv)
344 {
345 parse_opts(argc, argv);
346
347 if (cfg_do_ipv6) {
348 struct sockaddr_in6 addr6 = {0};
349
350 addr6.sin6_family = AF_INET6;
351 addr6.sin6_port = htons(cfg_port);
352 addr6.sin6_addr = in6addr_loopback;
353
354 cfg_errq_level = SOL_IPV6;
355 cfg_errq_type = IPV6_RECVERR;
356
357 do_test((void *)&addr6, sizeof(addr6));
358 }
359
360 if (cfg_do_ipv4) {
361 struct sockaddr_in addr4 = {0};
362
363 addr4.sin_family = AF_INET;
364 addr4.sin_port = htons(cfg_port);
365 addr4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
366
367 cfg_errq_level = SOL_IP;
368 cfg_errq_type = IP_RECVERR;
369
370 do_test((void *)&addr4, sizeof(addr4));
371 }
372
373 return 0;
374 }