1 // SPDX-License-Identifier: GPL-2.0
2
3 #define _GNU_SOURCE
4
5 #include <arpa/inet.h>
6 #include <error.h>
7 #include <errno.h>
8 #include <limits.h>
9 #include <linux/errqueue.h>
10 #include <linux/if_packet.h>
11 #include <linux/socket.h>
12 #include <linux/sockios.h>
13 #include <net/ethernet.h>
14 #include <net/if.h>
15 #include <netinet/ip.h>
16 #include <netinet/ip6.h>
17 #include <netinet/tcp.h>
18 #include <netinet/udp.h>
19 #include <poll.h>
20 #include <sched.h>
21 #include <stdbool.h>
22 #include <stdio.h>
23 #include <stdint.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <sys/ioctl.h>
27 #include <sys/socket.h>
28 #include <sys/stat.h>
29 #include <sys/time.h>
30 #include <sys/types.h>
31 #include <sys/wait.h>
32 #include <unistd.h>
33
34 #ifndef UDP_GRO
35 #define UDP_GRO 104
36 #endif
37
38 static int cfg_port = 8000;
39 static bool cfg_tcp;
40 static bool cfg_verify;
41 static bool cfg_read_all;
42 static bool cfg_gro_segment;
43 static int cfg_family = PF_INET6;
44 static int cfg_alen = sizeof(struct sockaddr_in6);
45 static int cfg_expected_pkt_nr;
46 static int cfg_expected_pkt_len;
47 static int cfg_expected_gso_size;
48 static int cfg_connect_timeout_ms;
49 static int cfg_rcv_timeout_ms;
50 static struct sockaddr_storage cfg_bind_addr;
51
52 static bool interrupted;
53 static unsigned long packets, bytes;
54
55 static void sigint_handler(int signum)
56 {
57 if (signum == SIGINT)
58 interrupted = true;
59 }
60
61 static void setup_sockaddr(int domain, const char *str_addr, void *sockaddr)
62 {
63 struct sockaddr_in6 *addr6 = (void *) sockaddr;
64 struct sockaddr_in *addr4 = (void *) sockaddr;
65
66 switch (domain) {
67 case PF_INET:
68 addr4->sin_family = AF_INET;
69 addr4->sin_port = htons(cfg_port);
70 if (inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1)
71 error(1, 0, "ipv4 parse error: %s", str_addr);
72 break;
73 case PF_INET6:
74 addr6->sin6_family = AF_INET6;
75 addr6->sin6_port = htons(cfg_port);
76 if (inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1)
77 error(1, 0, "ipv6 parse error: %s", str_addr);
78 break;
79 default:
80 error(1, 0, "illegal domain");
81 }
82 }
83
84 static unsigned long gettimeofday_ms(void)
85 {
86 struct timeval tv;
87
88 gettimeofday(&tv, NULL);
89 return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
90 }
91
92 static void do_poll(int fd, int timeout_ms)
93 {
94 struct pollfd pfd;
95 int ret;
96
97 pfd.events = POLLIN;
98 pfd.revents = 0;
99 pfd.fd = fd;
100
101 do {
102 ret = poll(&pfd, 1, 10);
103 if (interrupted)
104 break;
105 if (ret == -1)
106 error(1, errno, "poll");
107 if (ret == 0) {
108 if (!timeout_ms)
109 continue;
110
111 timeout_ms -= 10;
112 if (timeout_ms <= 0) {
113 interrupted = true;
114 break;
115 }
116
117 /* no events and more time to wait, do poll again */
118 continue;
119 }
120 if (pfd.revents != POLLIN)
121 error(1, errno, "poll: 0x%x expected 0x%x\n",
122 pfd.revents, POLLIN);
123 } while (!ret);
124 }
125
126 static int do_socket(bool do_tcp)
127 {
128 int fd, val;
129
130 fd = socket(cfg_family, cfg_tcp ? SOCK_STREAM : SOCK_DGRAM, 0);
131 if (fd == -1)
132 error(1, errno, "socket");
133
134 val = 1 << 21;
135 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)))
136 error(1, errno, "setsockopt rcvbuf");
137 val = 1;
138 if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val)))
139 error(1, errno, "setsockopt reuseport");
140
141 if (bind(fd, (void *)&cfg_bind_addr, cfg_alen))
142 error(1, errno, "bind");
143
144 if (do_tcp) {
145 int accept_fd = fd;
146
147 if (listen(accept_fd, 1))
148 error(1, errno, "listen");
149
150 do_poll(accept_fd, cfg_connect_timeout_ms);
151 if (interrupted)
152 exit(0);
153
154 fd = accept(accept_fd, NULL, NULL);
155 if (fd == -1)
156 error(1, errno, "accept");
157 if (close(accept_fd))
158 error(1, errno, "close accept fd");
159 }
160
161 return fd;
162 }
163
164 /* Flush all outstanding bytes for the tcp receive queue */
165 static void do_flush_tcp(int fd)
166 {
167 int ret;
168
169 while (true) {
170 /* MSG_TRUNC flushes up to len bytes */
171 ret = recv(fd, NULL, 1 << 21, MSG_TRUNC | MSG_DONTWAIT);
172 if (ret == -1 && errno == EAGAIN)
173 return;
174 if (ret == -1)
175 error(1, errno, "flush");
176 if (ret == 0) {
177 /* client detached */
178 exit(0);
179 }
180
181 packets++;
182 bytes += ret;
183 }
184
185 }
186
187 static char sanitized_char(char val)
188 {
189 return (val >= 'a' && val <= 'z') ? val : '.';
190 }
191
192 static void do_verify_udp(const char *data, int len)
193 {
194 char cur = data[0];
195 int i;
196
197 /* verify contents */
198 if (cur < 'a' || cur > 'z')
199 error(1, 0, "data initial byte out of range");
200
201 for (i = 1; i < len; i++) {
202 if (cur == 'z')
203 cur = 'a';
204 else
205 cur++;
206
207 if (data[i] != cur)
208 error(1, 0, "data[%d]: len %d, %c(%hhu) != %c(%hhu)\n",
209 i, len,
210 sanitized_char(data[i]), data[i],
211 sanitized_char(cur), cur);
212 }
213 }
214
215 static int recv_msg(int fd, char *buf, int len, int *gso_size)
216 {
217 char control[CMSG_SPACE(sizeof(int))] = {0};
218 struct msghdr msg = {0};
219 struct iovec iov = {0};
220 struct cmsghdr *cmsg;
221 int ret;
222
223 iov.iov_base = buf;
224 iov.iov_len = len;
225
226 msg.msg_iov = &iov;
227 msg.msg_iovlen = 1;
228
229 msg.msg_control = control;
230 msg.msg_controllen = sizeof(control);
231
232 *gso_size = -1;
233 ret = recvmsg(fd, &msg, MSG_TRUNC | MSG_DONTWAIT);
234 if (ret != -1) {
235 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
236 cmsg = CMSG_NXTHDR(&msg, cmsg)) {
237 if (cmsg->cmsg_level == SOL_UDP
238 && cmsg->cmsg_type == UDP_GRO) {
239 *gso_size = *(int *)CMSG_DATA(cmsg);
240 break;
241 }
242 }
243 }
244 return ret;
245 }
246
247 /* Flush all outstanding datagrams. Verify first few bytes of each. */
248 static void do_flush_udp(int fd)
249 {
250 static char rbuf[ETH_MAX_MTU];
251 int ret, len, gso_size = 0, budget = 256;
252
253 len = cfg_read_all ? sizeof(rbuf) : 0;
254 while (budget--) {
255 /* MSG_TRUNC will make return value full datagram length */
256 if (!cfg_expected_gso_size)
257 ret = recv(fd, rbuf, len, MSG_TRUNC | MSG_DONTWAIT);
258 else
259 ret = recv_msg(fd, rbuf, len, &gso_size);
260 if (ret == -1 && errno == EAGAIN)
261 break;
262 if (ret == -1)
263 error(1, errno, "recv");
264 if (cfg_expected_pkt_len && ret != cfg_expected_pkt_len)
265 error(1, 0, "recv: bad packet len, got %d,"
266 " expected %d\n", ret, cfg_expected_pkt_len);
267 if (len && cfg_verify) {
268 if (ret == 0)
269 error(1, errno, "recv: 0 byte datagram\n");
270
271 do_verify_udp(rbuf, ret);
272 }
273 if (cfg_expected_gso_size && cfg_expected_gso_size != gso_size)
274 error(1, 0, "recv: bad gso size, got %d, expected %d "
275 "(-1 == no gso cmsg))\n", gso_size,
276 cfg_expected_gso_size);
277
278 packets++;
279 bytes += ret;
280 if (cfg_expected_pkt_nr && packets >= cfg_expected_pkt_nr)
281 break;
282 }
283 }
284
285 static void usage(const char *filepath)
286 {
287 error(1, 0, "Usage: %s [-C connect_timeout] [-Grtv] [-b addr] [-p port]"
288 " [-l pktlen] [-n packetnr] [-R rcv_timeout] [-S gsosize]",
289 filepath);
290 }
291
292 static void parse_opts(int argc, char **argv)
293 {
294 const char *bind_addr = NULL;
295 int c;
296
297 while ((c = getopt(argc, argv, "4b:C:Gl:n:p:rR:S:tv")) != -1) {
298 switch (c) {
299 case '4':
300 cfg_family = PF_INET;
301 cfg_alen = sizeof(struct sockaddr_in);
302 break;
303 case 'b':
304 bind_addr = optarg;
305 break;
306 case 'C':
307 cfg_connect_timeout_ms = strtoul(optarg, NULL, 0);
308 break;
309 case 'G':
310 cfg_gro_segment = true;
311 break;
312 case 'l':
313 cfg_expected_pkt_len = strtoul(optarg, NULL, 0);
314 break;
315 case 'n':
316 cfg_expected_pkt_nr = strtoul(optarg, NULL, 0);
317 break;
318 case 'p':
319 cfg_port = strtoul(optarg, NULL, 0);
320 break;
321 case 'r':
322 cfg_read_all = true;
323 break;
324 case 'R':
325 cfg_rcv_timeout_ms = strtoul(optarg, NULL, 0);
326 break;
327 case 'S':
328 cfg_expected_gso_size = strtol(optarg, NULL, 0);
329 break;
330 case 't':
331 cfg_tcp = true;
332 break;
333 case 'v':
334 cfg_verify = true;
335 cfg_read_all = true;
336 break;
337 default:
338 exit(1);
339 }
340 }
341
342 if (!bind_addr)
343 bind_addr = cfg_family == PF_INET6 ? "::" : "0.0.0.0";
344
345 setup_sockaddr(cfg_family, bind_addr, &cfg_bind_addr);
346
347 if (optind != argc)
348 usage(argv[0]);
349
350 if (cfg_tcp && cfg_verify)
351 error(1, 0, "TODO: implement verify mode for tcp");
352 }
353
354 static void do_recv(void)
355 {
356 int timeout_ms = cfg_tcp ? cfg_rcv_timeout_ms : cfg_connect_timeout_ms;
357 unsigned long tnow, treport;
358 int fd;
359
360 fd = do_socket(cfg_tcp);
361
362 if (cfg_gro_segment && !cfg_tcp) {
363 int val = 1;
364 if (setsockopt(fd, IPPROTO_UDP, UDP_GRO, &val, sizeof(val)))
365 error(1, errno, "setsockopt UDP_GRO");
366 }
367
368 treport = gettimeofday_ms() + 1000;
369 do {
370 do_poll(fd, timeout_ms);
371
372 if (cfg_tcp)
373 do_flush_tcp(fd);
374 else
375 do_flush_udp(fd);
376
377 tnow = gettimeofday_ms();
378 if (!cfg_expected_pkt_nr && tnow > treport) {
379 if (packets)
380 fprintf(stderr,
381 "%s rx: %6lu MB/s %8lu calls/s\n",
382 cfg_tcp ? "tcp" : "udp",
383 bytes >> 20, packets);
384 bytes = packets = 0;
385 treport = tnow + 1000;
386 }
387
388 timeout_ms = cfg_rcv_timeout_ms;
389
390 } while (!interrupted);
391
392 if (cfg_expected_pkt_nr && (packets != cfg_expected_pkt_nr))
393 error(1, 0, "wrong packet number! got %ld, expected %d\n",
394 packets, cfg_expected_pkt_nr);
395
396 if (close(fd))
397 error(1, errno, "close");
398 }
399
400 int main(int argc, char **argv)
401 {
402 parse_opts(argc, argv);
403
404 signal(SIGINT, sigint_handler);
405
406 do_recv();
407
408 return 0;
409 }
410
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