1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2014-2016 Oracle and/or its affiliates. All Rights Reserved.
4 * Author: Alexey Kodanev <alexey.kodanev@oracle.com>
5 */
6
7 #include <pthread.h>
8 #include <stdlib.h>
9 #include <limits.h>
10 #include <linux/dccp.h>
11 #include <sys/types.h>
12 #include <sys/socket.h>
13 #include <netdb.h>
14 #include <netinet/in.h>
15 #include <netinet/tcp.h>
16 #include <arpa/inet.h>
17 #include <poll.h>
18 #include <time.h>
19 #include <string.h>
20 #include <unistd.h>
21 #include <errno.h>
22
23 #include "lapi/udp.h"
24 #include "lapi/dccp.h"
25 #include "lapi/netinet_in.h"
26 #include "lapi/posix_clocks.h"
27 #include "lapi/socket.h"
28 #include "lapi/tcp.h"
29 #include "tst_safe_stdio.h"
30 #include "tst_safe_pthread.h"
31 #include "tst_test.h"
32
33 static const int max_msg_len = (1 << 16) - 1;
34 static const int min_msg_len = 5;
35
36 enum {
37 SERVER_HOST = 0,
38 CLIENT_HOST,
39 };
40 static char *client_mode;
41
42 enum {
43 TFO_DISABLED = 0,
44 TFO_ENABLED,
45 };
46 static int tfo_value = -1;
47 static char *fastopen_api, *fastopen_sapi;
48
49 static const char tfo_cfg[] = "/proc/sys/net/ipv4/tcp_fastopen";
50 static const char tcp_tw_reuse[] = "/proc/sys/net/ipv4/tcp_tw_reuse";
51 static int tw_reuse_changed;
52 static int tfo_cfg_value;
53 static int tfo_cfg_changed;
54 static int tfo_queue_size = 100;
55 static int max_queue_len = 100;
56 static const int client_byte = 0x43;
57 static const int server_byte = 0x53;
58 static const int start_byte = 0x24;
59 static const int start_fin_byte = 0x25;
60 static const int end_byte = 0x0a;
61 static int init_cln_msg_len = 32;
62 static int init_srv_msg_len = 128;
63 static int max_rand_msg_len;
64
65 /*
66 * The number of requests from client after
67 * which server has to close the connection.
68 */
69 static int server_max_requests = 3;
70 static int client_max_requests = 10;
71 static int clients_num;
72 static char *tcp_port;
73 static char *server_addr;
74 static char *source_addr;
75 static char *server_bg;
76 static int busy_poll = -1;
77 static int max_etime_cnt = 21; /* ~60 sec max timeout if no connection */
78 static int max_eshutdown_cnt = 10;
79 static int max_pmtu_err = 10;
80
81 enum {
82 TYPE_TCP = 0,
83 TYPE_UDP,
84 TYPE_UDP_LITE,
85 TYPE_DCCP,
86 TYPE_SCTP
87 };
88 static uint proto_type;
89 static char *type;
90 static char *dev;
91 static int sock_type = SOCK_STREAM;
92 static int protocol;
93 static int family = AF_INET6;
94
95 static uint32_t service_code = 0xffff;
96
97 /* server socket */
98 static int sfd;
99
100 /* how long a client must wait for the server's reply */
101 static int wait_timeout = 60000;
102
103 /* in the end test will save time result in this file */
104 static char *rpath;
105 static char *port_path = "netstress_port";
106 static char *log_path = "netstress.log";
107
108 static char *narg, *Narg, *qarg, *rarg, *Rarg, *aarg, *Targ, *barg, *targ,
109 *Aarg;
110
111 /* common structure for TCP/UDP server and TCP/UDP client */
112 struct net_func {
113 void (*init)(void);
114 void (*run)(void);
115 void (*cleanup)(void);
116 };
117 static struct net_func net;
118
119 #define MAX_THREADS 10000
120 static pthread_attr_t attr;
121 static pthread_t *thread_ids;
122
123 static struct addrinfo *remote_addrinfo;
124 static struct addrinfo *local_addrinfo;
125
126 struct sock_info {
127 int fd;
128 struct sockaddr_storage raddr;
129 socklen_t raddr_len;
130 int etime_cnt;
131 int pmtu_err_cnt;
132 int eshutdown_cnt;
133 int timeout;
134 };
135
136 static char *zcopy;
137 static int send_flags = MSG_NOSIGNAL;
138 static char *reuse_port;
139
init_socket_opts(int sd)140 static void init_socket_opts(int sd)
141 {
142 if (busy_poll >= 0)
143 SAFE_SETSOCKOPT_INT(sd, SOL_SOCKET, SO_BUSY_POLL, busy_poll);
144
145 if (dev)
146 SAFE_SETSOCKOPT(sd, SOL_SOCKET, SO_BINDTODEVICE, dev,
147 strlen(dev) + 1);
148
149 switch (proto_type) {
150 case TYPE_TCP:
151 if (client_mode && fastopen_sapi) {
152 SAFE_SETSOCKOPT_INT(sd, IPPROTO_TCP,
153 TCP_FASTOPEN_CONNECT, 1);
154 }
155 if (client_mode && zcopy)
156 SAFE_SETSOCKOPT_INT(sd, SOL_SOCKET, SO_ZEROCOPY, 1);
157 break;
158 case TYPE_DCCP:
159 SAFE_SETSOCKOPT_INT(sd, SOL_DCCP, DCCP_SOCKOPT_SERVICE,
160 service_code);
161 break;
162 case TYPE_UDP_LITE: {
163 int cscov = init_srv_msg_len >> 1;
164
165 if (cscov < 8)
166 cscov = 8;
167 tst_res(TINFO, "UDP-Lite send cscov is %d", cscov);
168 /* set checksum for header and partially for payload */
169 SAFE_SETSOCKOPT_INT(sd, SOL_UDPLITE, UDPLITE_SEND_CSCOV, cscov);
170 SAFE_SETSOCKOPT_INT(sd, SOL_UDPLITE, UDPLITE_RECV_CSCOV, 8);
171 } break;
172 }
173 }
174
do_cleanup(void)175 static void do_cleanup(void)
176 {
177 if (net.cleanup)
178 net.cleanup();
179
180 if (tfo_cfg_changed) {
181 tst_res(TINFO, "unset '%s' back to '%d'",
182 tfo_cfg, tfo_cfg_value);
183 SAFE_FILE_PRINTF(tfo_cfg, "%d", tfo_cfg_value);
184 }
185
186 if (tw_reuse_changed) {
187 SAFE_FILE_PRINTF(tcp_tw_reuse, "0");
188 tst_res(TINFO, "unset '%s' back to '0'", tcp_tw_reuse);
189 }
190 }
TST_DECLARE_ONCE_FN(cleanup,do_cleanup)191 TST_DECLARE_ONCE_FN(cleanup, do_cleanup)
192
193 static int sock_recv_poll(char *buf, int size, struct sock_info *i)
194 {
195 struct pollfd pfd;
196 pfd.fd = i->fd;
197 pfd.events = POLLIN;
198 int len = -1;
199
200 while (1) {
201 errno = 0;
202 int ret = poll(&pfd, 1, i->timeout);
203 if (ret == -1) {
204 if (errno == EINTR)
205 continue;
206 break;
207 }
208
209 if (ret != 1) {
210 if (!errno)
211 errno = ETIME;
212 break;
213 }
214
215 if (!(pfd.revents & POLLIN)) {
216 if (pfd.revents & POLLERR) {
217 int err = 0;
218 socklen_t err_len = sizeof(err);
219
220 getsockopt(i->fd, SOL_SOCKET, SO_ERROR,
221 &err, &err_len);
222 if (!err)
223 continue;
224 errno = err;
225 }
226 break;
227 }
228
229 errno = 0;
230 len = recvfrom(i->fd, buf, size, MSG_DONTWAIT,
231 (struct sockaddr *)&i->raddr,
232 &i->raddr_len);
233
234 if (len == -1 && errno == EINTR)
235 continue;
236
237 if (len == 0)
238 errno = ESHUTDOWN;
239
240 break;
241 }
242
243 return len;
244 }
245
client_recv(char * buf,int srv_msg_len,struct sock_info * i)246 static int client_recv(char *buf, int srv_msg_len, struct sock_info *i)
247 {
248 int len, offset = 0;
249
250 while (1) {
251 errno = 0;
252 len = sock_recv_poll(buf + offset, srv_msg_len - offset, i);
253
254 /* socket closed or msg is not valid */
255 if (len < 1 || (offset + len) > srv_msg_len ||
256 (buf[0] != start_byte && buf[0] != start_fin_byte)) {
257 /* packet too big message, resend with new pmtu */
258 if (errno == EMSGSIZE) {
259 if (++(i->pmtu_err_cnt) < max_pmtu_err)
260 return 0;
261 tst_brk(TFAIL, "too many pmtu errors %d",
262 i->pmtu_err_cnt);
263 } else if (!errno) {
264 errno = ENOMSG;
265 }
266 break;
267 }
268 offset += len;
269 if (buf[offset - 1] != end_byte)
270 continue;
271
272 /* recv last msg, close socket */
273 if (buf[0] == start_fin_byte)
274 break;
275 return 0;
276 }
277
278 if (sock_type != SOCK_STREAM) {
279 if (errno == ETIME) {
280 if (++(i->etime_cnt) > max_etime_cnt)
281 tst_brk(TFAIL, "client requests timeout %d times, last timeout %dms",
282 i->etime_cnt, i->timeout);
283 /* Increase timeout in poll up to 3.2 sec */
284 if (i->timeout < 3000)
285 i->timeout <<= 1;
286 return 0;
287 }
288 if (errno == ESHUTDOWN) {
289 if (++(i->eshutdown_cnt) > max_eshutdown_cnt)
290 tst_brk(TFAIL, "too many zero-length msgs");
291 tst_res(TINFO, "%d-length msg on sock %d", len, i->fd);
292 return 0;
293 }
294 }
295
296 SAFE_CLOSE(i->fd);
297 return (errno) ? -1 : 0;
298 }
299
300 static int bind_no_port;
bind_before_connect(int sd)301 static void bind_before_connect(int sd)
302 {
303 if (!local_addrinfo)
304 return;
305
306 if (bind_no_port)
307 SAFE_SETSOCKOPT_INT(sd, SOL_IP, IP_BIND_ADDRESS_NO_PORT, 1);
308 if (reuse_port)
309 SAFE_SETSOCKOPT_INT(sd, SOL_SOCKET, SO_REUSEPORT, 1);
310
311 SAFE_BIND(sd, local_addrinfo->ai_addr, local_addrinfo->ai_addrlen);
312
313 if (bind_no_port && proto_type != TYPE_SCTP) {
314 int port = TST_GETSOCKPORT(sd);
315
316 if (port)
317 tst_brk(TFAIL, "port not zero after bind(): %d", port);
318 }
319 }
320
client_connect_send(const char * msg,int size)321 static int client_connect_send(const char *msg, int size)
322 {
323 int cfd = SAFE_SOCKET(family, sock_type, protocol);
324
325 init_socket_opts(cfd);
326
327 if (fastopen_api) {
328 /* Replaces connect() + send()/write() */
329 SAFE_SENDTO(1, cfd, msg, size, send_flags | MSG_FASTOPEN,
330 remote_addrinfo->ai_addr, remote_addrinfo->ai_addrlen);
331 } else {
332 bind_before_connect(cfd);
333 /* old TCP API */
334 SAFE_CONNECT(cfd, remote_addrinfo->ai_addr,
335 remote_addrinfo->ai_addrlen);
336 SAFE_SEND(1, cfd, msg, size, send_flags);
337 }
338 return cfd;
339 }
340
341 union net_size_field {
342 char bytes[2];
343 uint16_t value;
344 };
345
make_client_request(char client_msg[],int * cln_len,int * srv_len)346 static void make_client_request(char client_msg[], int *cln_len, int *srv_len)
347 {
348 if (max_rand_msg_len)
349 *cln_len = *srv_len = min_msg_len + rand() % max_rand_msg_len;
350
351 memset(client_msg, client_byte, *cln_len);
352 client_msg[0] = start_byte;
353
354 /* set size for reply */
355 union net_size_field net_size;
356
357 net_size.value = htons(*srv_len);
358 client_msg[1] = net_size.bytes[0];
359 client_msg[2] = net_size.bytes[1];
360
361 client_msg[*cln_len - 1] = end_byte;
362 }
363
client_fn(LTP_ATTRIBUTE_UNUSED void * arg)364 void *client_fn(LTP_ATTRIBUTE_UNUSED void *arg)
365 {
366 int cln_len = init_cln_msg_len,
367 srv_len = init_srv_msg_len;
368 struct sock_info inf;
369 char buf[max_msg_len];
370 char client_msg[max_msg_len];
371 int i = 0;
372 intptr_t err = 0;
373
374 inf.raddr_len = sizeof(inf.raddr);
375 inf.etime_cnt = 0;
376 inf.timeout = wait_timeout;
377 inf.pmtu_err_cnt = 0;
378
379 make_client_request(client_msg, &cln_len, &srv_len);
380
381 /* connect & send requests */
382 inf.fd = client_connect_send(client_msg, cln_len);
383 if (inf.fd == -1) {
384 err = errno;
385 goto out;
386 }
387
388 if (client_recv(buf, srv_len, &inf)) {
389 err = errno;
390 goto out;
391 }
392
393 for (i = 1; i < client_max_requests; ++i) {
394 if (inf.fd == -1) {
395 inf.fd = client_connect_send(client_msg, cln_len);
396 if (inf.fd == -1) {
397 err = errno;
398 goto out;
399 }
400
401 if (client_recv(buf, srv_len, &inf)) {
402 err = errno;
403 break;
404 }
405 continue;
406 }
407
408 if (max_rand_msg_len)
409 make_client_request(client_msg, &cln_len, &srv_len);
410
411 SAFE_SEND(1, inf.fd, client_msg, cln_len, send_flags);
412
413 if (client_recv(buf, srv_len, &inf)) {
414 err = errno;
415 break;
416 }
417 }
418
419 if (inf.fd != -1)
420 SAFE_CLOSE(inf.fd);
421
422 out:
423 if (i != client_max_requests)
424 tst_res(TWARN, "client exit on '%d' request", i);
425
426 return (void *) err;
427 }
428
parse_client_request(const char * msg)429 static int parse_client_request(const char *msg)
430 {
431 union net_size_field net_size;
432 net_size.bytes[0] = msg[1];
433 net_size.bytes[1] = msg[2];
434 int size = ntohs(net_size.value);
435 if (size < 2 || size > max_msg_len)
436 return -1;
437
438 return size;
439 }
440
441 static struct timespec tv_client_start;
442 static struct timespec tv_client_end;
443
setup_addrinfo(const char * src_addr,const char * port,const struct addrinfo * hints,struct addrinfo ** addr_info)444 static void setup_addrinfo(const char *src_addr, const char *port,
445 const struct addrinfo *hints,
446 struct addrinfo **addr_info)
447 {
448 int err = getaddrinfo(src_addr, port, hints, addr_info);
449
450 if (err)
451 tst_brk(TBROK, "getaddrinfo failed, %s", gai_strerror(err));
452
453 if (!*addr_info)
454 tst_brk(TBROK, "failed to get the address");
455 }
456
client_init(void)457 static void client_init(void)
458 {
459 if (clients_num >= MAX_THREADS) {
460 tst_brk(TBROK, "Unexpected num of clients '%d'",
461 clients_num);
462 }
463
464 thread_ids = SAFE_MALLOC(sizeof(pthread_t) * clients_num);
465
466 struct addrinfo hints;
467 memset(&hints, 0, sizeof(struct addrinfo));
468 hints.ai_family = AF_UNSPEC;
469 hints.ai_socktype = sock_type;
470 hints.ai_flags = 0;
471 hints.ai_protocol = 0;
472
473 if (source_addr)
474 setup_addrinfo(source_addr, NULL, &hints, &local_addrinfo);
475 setup_addrinfo(server_addr, tcp_port, &hints, &remote_addrinfo);
476
477 tst_res(TINFO, "Running the test over IPv%s",
478 (remote_addrinfo->ai_family == AF_INET6) ? "6" : "4");
479
480 family = remote_addrinfo->ai_family;
481
482 clock_gettime(CLOCK_MONOTONIC_RAW, &tv_client_start);
483 int i;
484 for (i = 0; i < clients_num; ++i)
485 SAFE_PTHREAD_CREATE(&thread_ids[i], 0, client_fn, NULL);
486 }
487
client_run(void)488 static void client_run(void)
489 {
490 void *res = NULL;
491 long clnt_time = 0;
492 int i;
493 for (i = 0; i < clients_num; ++i) {
494 pthread_join(thread_ids[i], &res);
495 if (res) {
496 tst_brk(TBROK, "client[%d] failed: %s",
497 i, strerror((intptr_t)res));
498 }
499 }
500
501 clock_gettime(CLOCK_MONOTONIC_RAW, &tv_client_end);
502 clnt_time = (tv_client_end.tv_sec - tv_client_start.tv_sec) * 1000 +
503 (tv_client_end.tv_nsec - tv_client_start.tv_nsec) / 1000000;
504
505 tst_res(TINFO, "total time '%ld' ms", clnt_time);
506
507 char client_msg[min_msg_len];
508 int msg_len = min_msg_len;
509
510 max_rand_msg_len = 0;
511 make_client_request(client_msg, &msg_len, &msg_len);
512 /* ask server to terminate */
513 client_msg[0] = start_fin_byte;
514 int cfd = client_connect_send(client_msg, msg_len);
515 if (cfd != -1) {
516 shutdown(cfd, SHUT_WR);
517 SAFE_CLOSE(cfd);
518 }
519 /* the script tcp_fastopen_run.sh will remove it */
520 if (rpath)
521 SAFE_FILE_PRINTF(rpath, "%ld", clnt_time);
522
523 tst_res(TPASS, "test completed");
524 }
525
client_cleanup(void)526 static void client_cleanup(void)
527 {
528 free(thread_ids);
529
530 if (remote_addrinfo)
531 freeaddrinfo(remote_addrinfo);
532 }
533
make_server_reply(char * send_msg,int size)534 static void make_server_reply(char *send_msg, int size)
535 {
536 memset(send_msg, server_byte, size - 1);
537 send_msg[0] = start_byte;
538 send_msg[size - 1] = end_byte;
539 }
540
server_fn(void * cfd)541 void *server_fn(void *cfd)
542 {
543 int num_requests = 0, offset = 0;
544 char send_msg[max_msg_len], end[] = { end_byte };
545 int start_send_type = (sock_type == SOCK_DGRAM) ? 1 : 0;
546 int send_msg_len, send_type = start_send_type;
547 char recv_msg[max_msg_len];
548 struct sock_info inf;
549 ssize_t recv_len;
550 struct iovec iov[2];
551 struct msghdr msg;
552
553 inf.fd = (intptr_t) cfd;
554 inf.raddr_len = sizeof(inf.raddr);
555 inf.timeout = wait_timeout;
556
557 iov[0].iov_base = send_msg;
558 iov[1].iov_base = end;
559 iov[1].iov_len = 1;
560 memset(&msg, 0, sizeof(msg));
561 msg.msg_name = &inf.raddr;
562 msg.msg_iov = iov;
563 msg.msg_iovlen = 2;
564
565 init_socket_opts(inf.fd);
566
567 while (1) {
568 recv_len = sock_recv_poll(recv_msg + offset,
569 max_msg_len - offset, &inf);
570
571 if (recv_len == 0)
572 break;
573
574 if (recv_len < 0 || (offset + recv_len) > max_msg_len ||
575 (recv_msg[0] != start_byte &&
576 recv_msg[0] != start_fin_byte)) {
577 tst_res(TFAIL, "recv failed, sock '%d'", inf.fd);
578 goto out;
579 }
580
581 offset += recv_len;
582
583 if (recv_msg[offset - 1] != end_byte) {
584 /* msg is not complete, continue recv */
585 continue;
586 }
587
588 /* client asks to terminate */
589 if (recv_msg[0] == start_fin_byte)
590 goto out;
591
592 send_msg_len = parse_client_request(recv_msg);
593 if (send_msg_len < 0) {
594 tst_res(TFAIL, "wrong msg size '%d'",
595 send_msg_len);
596 goto out;
597 }
598 make_server_reply(send_msg, send_msg_len);
599
600 offset = 0;
601
602 /*
603 * It will tell client that server is going
604 * to close this connection.
605 */
606 if (sock_type == SOCK_STREAM &&
607 ++num_requests >= server_max_requests)
608 send_msg[0] = start_fin_byte;
609
610 switch (send_type) {
611 case 0:
612 SAFE_SEND(1, inf.fd, send_msg, send_msg_len,
613 send_flags);
614 if (proto_type != TYPE_SCTP)
615 ++send_type;
616 break;
617 case 1:
618 SAFE_SENDTO(1, inf.fd, send_msg, send_msg_len,
619 send_flags, (struct sockaddr *)&inf.raddr,
620 inf.raddr_len);
621 ++send_type;
622 break;
623 default:
624 iov[0].iov_len = send_msg_len - 1;
625 msg.msg_namelen = inf.raddr_len;
626 SAFE_SENDMSG(send_msg_len, inf.fd, &msg, send_flags);
627 send_type = start_send_type;
628 break;
629 }
630
631 if (sock_type == SOCK_STREAM &&
632 num_requests >= server_max_requests) {
633 /* max reqs, close socket */
634 shutdown(inf.fd, SHUT_WR);
635 break;
636 }
637 }
638
639 SAFE_CLOSE(inf.fd);
640 return NULL;
641
642 out:
643 SAFE_CLOSE(inf.fd);
644 tst_brk(TBROK, "Server closed");
645 return NULL;
646 }
647
server_thread_add(intptr_t client_fd)648 static pthread_t server_thread_add(intptr_t client_fd)
649 {
650 pthread_t id;
651 SAFE_PTHREAD_CREATE(&id, &attr, server_fn, (void *) client_fd);
652 return id;
653 }
654
server_init(void)655 static void server_init(void)
656 {
657 char *src_addr = NULL;
658 struct addrinfo hints;
659
660 memset(&hints, 0, sizeof(struct addrinfo));
661 hints.ai_family = AF_INET6;
662 hints.ai_socktype = sock_type;
663 hints.ai_flags = AI_PASSIVE;
664
665 if (!source_addr && !tcp_port)
666 tcp_port = "0";
667
668 if (source_addr && !strchr(source_addr, ':'))
669 SAFE_ASPRINTF(&src_addr, "::ffff:%s", source_addr);
670 setup_addrinfo(src_addr ? src_addr : source_addr, tcp_port,
671 &hints, &local_addrinfo);
672 free(src_addr);
673
674 /* IPv6 socket is also able to access IPv4 protocol stack */
675 sfd = SAFE_SOCKET(family, sock_type, protocol);
676 SAFE_SETSOCKOPT_INT(sfd, SOL_SOCKET, SO_REUSEADDR, 1);
677 if (reuse_port)
678 SAFE_SETSOCKOPT_INT(sfd, SOL_SOCKET, SO_REUSEPORT, 1);
679
680 tst_res(TINFO, "assigning a name to the server socket...");
681 SAFE_BIND(sfd, local_addrinfo->ai_addr, local_addrinfo->ai_addrlen);
682
683 freeaddrinfo(local_addrinfo);
684
685 int port = TST_GETSOCKPORT(sfd);
686
687 tst_res(TINFO, "bind to port %d", port);
688 if (server_bg) {
689 SAFE_CHDIR(server_bg);
690 SAFE_FILE_PRINTF(port_path, "%d", port);
691 }
692
693 if (sock_type == SOCK_DGRAM)
694 return;
695
696 init_socket_opts(sfd);
697
698 if (fastopen_api || fastopen_sapi) {
699 SAFE_SETSOCKOPT_INT(sfd, IPPROTO_TCP, TCP_FASTOPEN,
700 tfo_queue_size);
701 }
702
703 if (zcopy)
704 SAFE_SETSOCKOPT_INT(sfd, SOL_SOCKET, SO_ZEROCOPY, 1);
705
706 SAFE_LISTEN(sfd, max_queue_len);
707
708 tst_res(TINFO, "Listen on the socket '%d'", sfd);
709 }
710
server_cleanup(void)711 static void server_cleanup(void)
712 {
713 SAFE_CLOSE(sfd);
714 }
715
move_to_background(void)716 static void move_to_background(void)
717 {
718 if (SAFE_FORK())
719 exit(0);
720
721 SAFE_SETSID();
722
723 close(STDIN_FILENO);
724 SAFE_OPEN("/dev/null", O_RDONLY);
725 close(STDOUT_FILENO);
726 close(STDERR_FILENO);
727
728 int fd = SAFE_OPEN(log_path, O_CREAT | O_TRUNC | O_RDONLY, 00444);
729
730 SAFE_DUP(fd);
731 }
732
server_run_udp(void)733 static void server_run_udp(void)
734 {
735 if (server_bg)
736 move_to_background();
737
738 pthread_t p_id = server_thread_add(sfd);
739
740 SAFE_PTHREAD_JOIN(p_id, NULL);
741 }
742
server_run(void)743 static void server_run(void)
744 {
745 if (server_bg)
746 move_to_background();
747
748 /* IPv4 source address will be mapped to IPv6 address */
749 struct sockaddr_in6 addr6;
750 socklen_t addr_size = sizeof(addr6);
751
752 pthread_attr_init(&attr);
753
754 /*
755 * detaching threads allow to reclaim thread's resources
756 * once a thread finishes its work.
757 */
758 if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0)
759 tst_brk(TBROK | TERRNO, "setdetachstate failed");
760
761 while (1) {
762 int client_fd = accept(sfd, (struct sockaddr *)&addr6,
763 &addr_size);
764
765 if (client_fd == -1)
766 tst_brk(TBROK, "Can't create client socket");
767
768 server_thread_add(client_fd);
769 }
770 }
771
require_root(const char * file)772 static void require_root(const char *file)
773 {
774 if (!geteuid())
775 return;
776 tst_brk(TCONF, "Test needs to be run as root to change %s", file);
777 }
778
check_tfo_value(void)779 static void check_tfo_value(void)
780 {
781 /* Check if we can write to tcp_fastopen knob. We might be
782 * inside netns and either have read-only permission or
783 * doesn't have the knob at all.
784 */
785 if (access(tfo_cfg, W_OK) < 0) {
786 /* TODO check /proc/self/ns/ or TST_USE_NETNS env var */
787 tst_res(TINFO, "can't read %s, assume server runs in netns",
788 tfo_cfg);
789 return;
790 }
791
792 SAFE_FILE_SCANF(tfo_cfg, "%d", &tfo_cfg_value);
793 tst_res(TINFO, "'%s' is %d", tfo_cfg, tfo_cfg_value);
794
795 /* The check can be the first in this function but set here
796 * to allow to print information about the currently set config
797 */
798 if (tfo_value < 0)
799 return;
800
801 if (tfo_cfg_value == tfo_value)
802 return;
803
804 require_root(tfo_cfg);
805
806 tst_res(TINFO, "set '%s' to '%d'", tfo_cfg, tfo_value);
807
808 SAFE_FILE_PRINTF(tfo_cfg, "%d", tfo_value);
809 tfo_cfg_changed = 1;
810 }
811
check_tw_reuse(void)812 static void check_tw_reuse(void)
813 {
814 if (access(tcp_tw_reuse, W_OK) < 0)
815 return;
816
817 int reuse_value = 0;
818
819 SAFE_FILE_SCANF(tcp_tw_reuse, "%d", &reuse_value);
820 if (reuse_value) {
821 tst_res(TINFO, "tcp_tw_reuse is already set");
822 return;
823 }
824
825 require_root(tfo_cfg);
826
827 SAFE_FILE_PRINTF(tcp_tw_reuse, "1");
828 tw_reuse_changed = 1;
829 tst_res(TINFO, "set '%s' to '1'", tcp_tw_reuse);
830 }
831
set_protocol_type(void)832 static void set_protocol_type(void)
833 {
834 if (!type || !strcmp(type, "tcp"))
835 proto_type = TYPE_TCP;
836 else if (!strcmp(type, "udp"))
837 proto_type = TYPE_UDP;
838 else if (!strcmp(type, "udp_lite"))
839 proto_type = TYPE_UDP_LITE;
840 else if (!strcmp(type, "dccp"))
841 proto_type = TYPE_DCCP;
842 else if (!strcmp(type, "sctp"))
843 proto_type = TYPE_SCTP;
844 else
845 tst_brk(TBROK, "Invalid proto_type: '%s'", type);
846 }
847
setup(void)848 static void setup(void)
849 {
850 if (tst_parse_int(aarg, &clients_num, 1, INT_MAX))
851 tst_brk(TBROK, "Invalid client number '%s'", aarg);
852 if (tst_parse_int(rarg, &client_max_requests, 1, INT_MAX))
853 tst_brk(TBROK, "Invalid client max requests '%s'", rarg);
854 if (tst_parse_int(Rarg, &server_max_requests, 1, INT_MAX))
855 tst_brk(TBROK, "Invalid server max requests '%s'", Rarg);
856 if (tst_parse_int(narg, &init_cln_msg_len, min_msg_len, max_msg_len))
857 tst_brk(TBROK, "Invalid client msg size '%s'", narg);
858 if (tst_parse_int(Narg, &init_srv_msg_len, min_msg_len, max_msg_len))
859 tst_brk(TBROK, "Invalid server msg size '%s'", Narg);
860 if (tst_parse_int(qarg, &tfo_queue_size, 1, INT_MAX))
861 tst_brk(TBROK, "Invalid TFO queue size '%s'", qarg);
862 if (tst_parse_int(Targ, &wait_timeout, 0, INT_MAX))
863 tst_brk(TBROK, "Invalid wait timeout '%s'", Targ);
864 if (tst_parse_int(barg, &busy_poll, 0, INT_MAX))
865 tst_brk(TBROK, "Invalid busy poll timeout'%s'", barg);
866 if (tst_parse_int(targ, &tfo_value, 0, INT_MAX))
867 tst_brk(TBROK, "Invalid net.ipv4.tcp_fastopen '%s'", targ);
868 if (tst_parse_int(Aarg, &max_rand_msg_len, 10, max_msg_len))
869 tst_brk(TBROK, "Invalid max random payload size '%s'", Aarg);
870
871 if (!server_addr)
872 server_addr = "localhost";
873
874 if (max_rand_msg_len) {
875 max_rand_msg_len -= min_msg_len;
876 unsigned int seed = max_rand_msg_len ^ client_max_requests;
877
878 srand(seed);
879 tst_res(TINFO, "srand() seed 0x%x", seed);
880 }
881
882 /* if client_num is not set, use num of processors */
883 if (!clients_num)
884 clients_num = sysconf(_SC_NPROCESSORS_ONLN);
885
886 if (tfo_value > 0 && tst_kvercmp(3, 7, 0) < 0)
887 tst_brk(TCONF, "Test must be run with kernel 3.7 or newer");
888
889 if (busy_poll >= 0 && tst_kvercmp(3, 11, 0) < 0)
890 tst_brk(TCONF, "Test must be run with kernel 3.11 or newer");
891
892 set_protocol_type();
893
894 if (client_mode) {
895 if (source_addr && tst_kvercmp(4, 2, 0) >= 0) {
896 bind_no_port = 1;
897 tst_res(TINFO, "IP_BIND_ADDRESS_NO_PORT is used");
898 }
899 tst_res(TINFO, "connection: addr '%s', port '%s'",
900 server_addr, tcp_port);
901 tst_res(TINFO, "client max req: %d", client_max_requests);
902 tst_res(TINFO, "clients num: %d", clients_num);
903 if (max_rand_msg_len) {
904 tst_res(TINFO, "random msg size [%d %d]",
905 min_msg_len, max_rand_msg_len);
906 } else {
907 tst_res(TINFO, "client msg size: %d", init_cln_msg_len);
908 tst_res(TINFO, "server msg size: %d", init_srv_msg_len);
909 }
910 net.init = client_init;
911 net.run = client_run;
912 net.cleanup = client_cleanup;
913
914 switch (proto_type) {
915 case TYPE_TCP:
916 check_tw_reuse();
917 break;
918 case TYPE_DCCP:
919 case TYPE_UDP:
920 case TYPE_UDP_LITE:
921 if (max_etime_cnt >= client_max_requests)
922 max_etime_cnt = client_max_requests - 1;
923 tst_res(TINFO, "maximum allowed timeout errors %d", max_etime_cnt);
924 wait_timeout = 100;
925 }
926 } else {
927 tst_res(TINFO, "max requests '%d'",
928 server_max_requests);
929 net.init = server_init;
930 switch (proto_type) {
931 case TYPE_TCP:
932 case TYPE_DCCP:
933 case TYPE_SCTP:
934 net.run = server_run;
935 net.cleanup = server_cleanup;
936 break;
937 case TYPE_UDP:
938 case TYPE_UDP_LITE:
939 net.run = server_run_udp;
940 net.cleanup = NULL;
941 break;
942 }
943 }
944
945 if (zcopy)
946 send_flags |= MSG_ZEROCOPY;
947
948 switch (proto_type) {
949 case TYPE_TCP:
950 tst_res(TINFO, "TCP %s is using %s TCP API.",
951 (client_mode) ? "client" : "server",
952 (fastopen_api) ? "Fastopen" : "old");
953 check_tfo_value();
954 break;
955 case TYPE_UDP:
956 tst_res(TINFO, "using UDP");
957 fastopen_api = fastopen_sapi = NULL;
958 sock_type = SOCK_DGRAM;
959 break;
960 case TYPE_UDP_LITE:
961 tst_res(TINFO, "using UDP Lite");
962 fastopen_api = fastopen_sapi = NULL;
963 sock_type = SOCK_DGRAM;
964 protocol = IPPROTO_UDPLITE;
965 break;
966 case TYPE_DCCP: {
967 /* dccp* modules can be blacklisted, load them manually */
968 const char * const argv[] = {"modprobe", "dccp_ipv6", NULL};
969
970 if (tst_run_cmd(argv, NULL, NULL, 1))
971 tst_brk(TCONF, "Failed to load dccp_ipv6 module");
972
973 tst_res(TINFO, "DCCP %s", (client_mode) ? "client" : "server");
974 fastopen_api = fastopen_sapi = NULL;
975 sock_type = SOCK_DCCP;
976 protocol = IPPROTO_DCCP;
977 service_code = htonl(service_code);
978 } break;
979 case TYPE_SCTP:
980 tst_res(TINFO, "SCTP %s", (client_mode) ? "client" : "server");
981 fastopen_api = fastopen_sapi = NULL;
982 protocol = IPPROTO_SCTP;
983 break;
984 }
985
986 net.init();
987 }
988
do_test(void)989 static void do_test(void)
990 {
991 net.run();
992 }
993
994 static struct tst_option options[] = {
995 {"f", &fastopen_api, "-f Use TFO API, default is old API"},
996 {"F", &fastopen_sapi,
997 "-F TCP_FASTOPEN_CONNECT socket option and standard API"},
998 {"t:", &targ, "-t x Set tcp_fastopen value"},
999
1000 {"S:", &source_addr, "-S x Source address to bind"},
1001 {"g:", &tcp_port, "-g x x - server port"},
1002 {"b:", &barg, "-b x x - low latency busy poll timeout"},
1003 {"T:", &type, "-T x tcp (default), udp, udp_lite, dccp, sctp"},
1004 {"z", &zcopy, "-z enable SO_ZEROCOPY"},
1005 {"P:", &reuse_port, "-P enable SO_REUSEPORT"},
1006 {"D:", &dev, "-D x bind to device x\n"},
1007
1008 {"H:", &server_addr, "Client:\n-H x Server name or IP address"},
1009 {"l", &client_mode, "-l Become client, default is server"},
1010 {"a:", &aarg, "-a x Number of clients running in parallel"},
1011 {"r:", &rarg, "-r x Number of client requests"},
1012 {"n:", &narg, "-n x Client message size"},
1013 {"N:", &Narg, "-N x Server message size"},
1014 {"m:", &Targ, "-m x Receive timeout in milliseconds (not used by UDP/DCCP client)"},
1015 {"d:", &rpath, "-d x x is a path to file where result is saved"},
1016 {"A:", &Aarg, "-A x x max payload length (generated randomly)\n"},
1017
1018 {"R:", &Rarg, "Server:\n-R x x requests after which conn.closed"},
1019 {"q:", &qarg, "-q x x - TFO queue"},
1020 {"B:", &server_bg, "-B x run in background, x - process directory"},
1021 {NULL, NULL, NULL}
1022 };
1023
1024 static struct tst_test test = {
1025 .test_all = do_test,
1026 .forks_child = 1,
1027 .setup = setup,
1028 .cleanup = cleanup,
1029 .options = options
1030 };
1031