1
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
38static int cfg_port = 8000;
39static bool cfg_tcp;
40static bool cfg_verify;
41static bool cfg_read_all;
42static bool cfg_gro_segment;
43static int cfg_family = PF_INET6;
44static int cfg_alen = sizeof(struct sockaddr_in6);
45static int cfg_expected_pkt_nr;
46static int cfg_expected_pkt_len;
47static int cfg_expected_gso_size;
48static int cfg_connect_timeout_ms;
49static int cfg_rcv_timeout_ms;
50static struct sockaddr_storage cfg_bind_addr;
51
52static bool interrupted;
53static unsigned long packets, bytes;
54
55static void sigint_handler(int signum)
56{
57 if (signum == SIGINT)
58 interrupted = true;
59}
60
61static 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
84static 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
92static 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 if (pfd.revents != POLLIN)
118 error(1, errno, "poll: 0x%x expected 0x%x\n",
119 pfd.revents, POLLIN);
120 } while (!ret);
121}
122
123static int do_socket(bool do_tcp)
124{
125 int fd, val;
126
127 fd = socket(cfg_family, cfg_tcp ? SOCK_STREAM : SOCK_DGRAM, 0);
128 if (fd == -1)
129 error(1, errno, "socket");
130
131 val = 1 << 21;
132 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)))
133 error(1, errno, "setsockopt rcvbuf");
134 val = 1;
135 if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val)))
136 error(1, errno, "setsockopt reuseport");
137
138 if (bind(fd, (void *)&cfg_bind_addr, cfg_alen))
139 error(1, errno, "bind");
140
141 if (do_tcp) {
142 int accept_fd = fd;
143
144 if (listen(accept_fd, 1))
145 error(1, errno, "listen");
146
147 do_poll(accept_fd, cfg_connect_timeout_ms);
148 if (interrupted)
149 exit(0);
150
151 fd = accept(accept_fd, NULL, NULL);
152 if (fd == -1)
153 error(1, errno, "accept");
154 if (close(accept_fd))
155 error(1, errno, "close accept fd");
156 }
157
158 return fd;
159}
160
161
162static void do_flush_tcp(int fd)
163{
164 int ret;
165
166 while (true) {
167
168 ret = recv(fd, NULL, 1 << 21, MSG_TRUNC | MSG_DONTWAIT);
169 if (ret == -1 && errno == EAGAIN)
170 return;
171 if (ret == -1)
172 error(1, errno, "flush");
173 if (ret == 0) {
174
175 exit(0);
176 }
177
178 packets++;
179 bytes += ret;
180 }
181
182}
183
184static char sanitized_char(char val)
185{
186 return (val >= 'a' && val <= 'z') ? val : '.';
187}
188
189static void do_verify_udp(const char *data, int len)
190{
191 char cur = data[0];
192 int i;
193
194
195 if (cur < 'a' || cur > 'z')
196 error(1, 0, "data initial byte out of range");
197
198 for (i = 1; i < len; i++) {
199 if (cur == 'z')
200 cur = 'a';
201 else
202 cur++;
203
204 if (data[i] != cur)
205 error(1, 0, "data[%d]: len %d, %c(%hhu) != %c(%hhu)\n",
206 i, len,
207 sanitized_char(data[i]), data[i],
208 sanitized_char(cur), cur);
209 }
210}
211
212static int recv_msg(int fd, char *buf, int len, int *gso_size)
213{
214 char control[CMSG_SPACE(sizeof(uint16_t))] = {0};
215 struct msghdr msg = {0};
216 struct iovec iov = {0};
217 struct cmsghdr *cmsg;
218 uint16_t *gsosizeptr;
219 int ret;
220
221 iov.iov_base = buf;
222 iov.iov_len = len;
223
224 msg.msg_iov = &iov;
225 msg.msg_iovlen = 1;
226
227 msg.msg_control = control;
228 msg.msg_controllen = sizeof(control);
229
230 *gso_size = -1;
231 ret = recvmsg(fd, &msg, MSG_TRUNC | MSG_DONTWAIT);
232 if (ret != -1) {
233 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
234 cmsg = CMSG_NXTHDR(&msg, cmsg)) {
235 if (cmsg->cmsg_level == SOL_UDP
236 && cmsg->cmsg_type == UDP_GRO) {
237 gsosizeptr = (uint16_t *) CMSG_DATA(cmsg);
238 *gso_size = *gsosizeptr;
239 break;
240 }
241 }
242 }
243 return ret;
244}
245
246
247static void do_flush_udp(int fd)
248{
249 static char rbuf[ETH_MAX_MTU];
250 int ret, len, gso_size, budget = 256;
251
252 len = cfg_read_all ? sizeof(rbuf) : 0;
253 while (budget--) {
254
255 if (!cfg_expected_gso_size)
256 ret = recv(fd, rbuf, len, MSG_TRUNC | MSG_DONTWAIT);
257 else
258 ret = recv_msg(fd, rbuf, len, &gso_size);
259 if (ret == -1 && errno == EAGAIN)
260 break;
261 if (ret == -1)
262 error(1, errno, "recv");
263 if (cfg_expected_pkt_len && ret != cfg_expected_pkt_len)
264 error(1, 0, "recv: bad packet len, got %d,"
265 " expected %d\n", ret, cfg_expected_pkt_len);
266 if (len && cfg_verify) {
267 if (ret == 0)
268 error(1, errno, "recv: 0 byte datagram\n");
269
270 do_verify_udp(rbuf, ret);
271 }
272 if (cfg_expected_gso_size && cfg_expected_gso_size != gso_size)
273 error(1, 0, "recv: bad gso size, got %d, expected %d "
274 "(-1 == no gso cmsg))\n", gso_size,
275 cfg_expected_gso_size);
276
277 packets++;
278 bytes += ret;
279 if (cfg_expected_pkt_nr && packets >= cfg_expected_pkt_nr)
280 break;
281 }
282}
283
284static void usage(const char *filepath)
285{
286 error(1, 0, "Usage: %s [-C connect_timeout] [-Grtv] [-b addr] [-p port]"
287 " [-l pktlen] [-n packetnr] [-R rcv_timeout] [-S gsosize]",
288 filepath);
289}
290
291static void parse_opts(int argc, char **argv)
292{
293 int c;
294
295
296 setup_sockaddr(PF_INET6, "::", &cfg_bind_addr);
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 setup_sockaddr(PF_INET, "0.0.0.0", &cfg_bind_addr);
303 break;
304 case 'b':
305 setup_sockaddr(cfg_family, optarg, &cfg_bind_addr);
306 break;
307 case 'C':
308 cfg_connect_timeout_ms = strtoul(optarg, NULL, 0);
309 break;
310 case 'G':
311 cfg_gro_segment = true;
312 break;
313 case 'l':
314 cfg_expected_pkt_len = strtoul(optarg, NULL, 0);
315 break;
316 case 'n':
317 cfg_expected_pkt_nr = strtoul(optarg, NULL, 0);
318 break;
319 case 'p':
320 cfg_port = strtoul(optarg, NULL, 0);
321 break;
322 case 'r':
323 cfg_read_all = true;
324 break;
325 case 'R':
326 cfg_rcv_timeout_ms = strtoul(optarg, NULL, 0);
327 break;
328 case 'S':
329 cfg_expected_gso_size = strtol(optarg, NULL, 0);
330 break;
331 case 't':
332 cfg_tcp = true;
333 break;
334 case 'v':
335 cfg_verify = true;
336 cfg_read_all = true;
337 break;
338 }
339 }
340
341 if (optind != argc)
342 usage(argv[0]);
343
344 if (cfg_tcp && cfg_verify)
345 error(1, 0, "TODO: implement verify mode for tcp");
346}
347
348static void do_recv(void)
349{
350 int timeout_ms = cfg_tcp ? cfg_rcv_timeout_ms : cfg_connect_timeout_ms;
351 unsigned long tnow, treport;
352 int fd;
353
354 fd = do_socket(cfg_tcp);
355
356 if (cfg_gro_segment && !cfg_tcp) {
357 int val = 1;
358 if (setsockopt(fd, IPPROTO_UDP, UDP_GRO, &val, sizeof(val)))
359 error(1, errno, "setsockopt UDP_GRO");
360 }
361
362 treport = gettimeofday_ms() + 1000;
363 do {
364 do_poll(fd, timeout_ms);
365
366 if (cfg_tcp)
367 do_flush_tcp(fd);
368 else
369 do_flush_udp(fd);
370
371 tnow = gettimeofday_ms();
372 if (tnow > treport) {
373 if (packets)
374 fprintf(stderr,
375 "%s rx: %6lu MB/s %8lu calls/s\n",
376 cfg_tcp ? "tcp" : "udp",
377 bytes >> 20, packets);
378 bytes = packets = 0;
379 treport = tnow + 1000;
380 }
381
382 timeout_ms = cfg_rcv_timeout_ms;
383
384 } while (!interrupted);
385
386 if (cfg_expected_pkt_nr && (packets != cfg_expected_pkt_nr))
387 error(1, 0, "wrong packet number! got %ld, expected %d\n",
388 packets, cfg_expected_pkt_nr);
389
390 if (close(fd))
391 error(1, errno, "close");
392}
393
394int main(int argc, char **argv)
395{
396 parse_opts(argc, argv);
397
398 signal(SIGINT, sigint_handler);
399
400 do_recv();
401
402 return 0;
403}
404
