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
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
|
// SPDX-License-Identifier: GPL-2.0-only
#define _GNU_SOURCE
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sched.h>
#include <arpa/inet.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <linux/err.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/limits.h>
#include "bpf_util.h"
#include "network_helpers.h"
#include "test_progs.h"
#ifndef IPPROTO_MPTCP
#define IPPROTO_MPTCP 262
#endif
#define clean_errno() (errno == 0 ? "None" : strerror(errno))
#define log_err(MSG, ...) ({ \
int __save = errno; \
fprintf(stderr, "(%s:%d: errno: %s) " MSG "\n", \
__FILE__, __LINE__, clean_errno(), \
##__VA_ARGS__); \
errno = __save; \
})
struct ipv4_packet pkt_v4 = {
.eth.h_proto = __bpf_constant_htons(ETH_P_IP),
.iph.ihl = 5,
.iph.protocol = IPPROTO_TCP,
.iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
.tcp.urg_ptr = 123,
.tcp.doff = 5,
};
struct ipv6_packet pkt_v6 = {
.eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
.iph.nexthdr = IPPROTO_TCP,
.iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
.tcp.urg_ptr = 123,
.tcp.doff = 5,
};
static const struct network_helper_opts default_opts;
int settimeo(int fd, int timeout_ms)
{
struct timeval timeout = { .tv_sec = 3 };
if (timeout_ms > 0) {
timeout.tv_sec = timeout_ms / 1000;
timeout.tv_usec = (timeout_ms % 1000) * 1000;
}
if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout,
sizeof(timeout))) {
log_err("Failed to set SO_RCVTIMEO");
return -1;
}
if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeout,
sizeof(timeout))) {
log_err("Failed to set SO_SNDTIMEO");
return -1;
}
return 0;
}
#define save_errno_close(fd) ({ int __save = errno; close(fd); errno = __save; })
static int __start_server(int type, int protocol, const struct sockaddr *addr,
socklen_t addrlen, int timeout_ms, bool reuseport)
{
int on = 1;
int fd;
fd = socket(addr->sa_family, type, protocol);
if (fd < 0) {
log_err("Failed to create server socket");
return -1;
}
if (settimeo(fd, timeout_ms))
goto error_close;
if (reuseport &&
setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on))) {
log_err("Failed to set SO_REUSEPORT");
goto error_close;
}
if (bind(fd, addr, addrlen) < 0) {
log_err("Failed to bind socket");
goto error_close;
}
if (type == SOCK_STREAM) {
if (listen(fd, 1) < 0) {
log_err("Failed to listed on socket");
goto error_close;
}
}
return fd;
error_close:
save_errno_close(fd);
return -1;
}
static int start_server_proto(int family, int type, int protocol,
const char *addr_str, __u16 port, int timeout_ms)
{
struct sockaddr_storage addr;
socklen_t addrlen;
if (make_sockaddr(family, addr_str, port, &addr, &addrlen))
return -1;
return __start_server(type, protocol, (struct sockaddr *)&addr,
addrlen, timeout_ms, false);
}
int start_server(int family, int type, const char *addr_str, __u16 port,
int timeout_ms)
{
return start_server_proto(family, type, 0, addr_str, port, timeout_ms);
}
int start_mptcp_server(int family, const char *addr_str, __u16 port,
int timeout_ms)
{
return start_server_proto(family, SOCK_STREAM, IPPROTO_MPTCP, addr_str,
port, timeout_ms);
}
int *start_reuseport_server(int family, int type, const char *addr_str,
__u16 port, int timeout_ms, unsigned int nr_listens)
{
struct sockaddr_storage addr;
unsigned int nr_fds = 0;
socklen_t addrlen;
int *fds;
if (!nr_listens)
return NULL;
if (make_sockaddr(family, addr_str, port, &addr, &addrlen))
return NULL;
fds = malloc(sizeof(*fds) * nr_listens);
if (!fds)
return NULL;
fds[0] = __start_server(type, 0, (struct sockaddr *)&addr, addrlen,
timeout_ms, true);
if (fds[0] == -1)
goto close_fds;
nr_fds = 1;
if (getsockname(fds[0], (struct sockaddr *)&addr, &addrlen))
goto close_fds;
for (; nr_fds < nr_listens; nr_fds++) {
fds[nr_fds] = __start_server(type, 0, (struct sockaddr *)&addr,
addrlen, timeout_ms, true);
if (fds[nr_fds] == -1)
goto close_fds;
}
return fds;
close_fds:
free_fds(fds, nr_fds);
return NULL;
}
int start_server_addr(int type, const struct sockaddr_storage *addr, socklen_t len,
const struct network_helper_opts *opts)
{
if (!opts)
opts = &default_opts;
return __start_server(type, 0, (struct sockaddr *)addr, len,
opts->timeout_ms, 0);
}
void free_fds(int *fds, unsigned int nr_close_fds)
{
if (fds) {
while (nr_close_fds)
close(fds[--nr_close_fds]);
free(fds);
}
}
int fastopen_connect(int server_fd, const char *data, unsigned int data_len,
int timeout_ms)
{
struct sockaddr_storage addr;
socklen_t addrlen = sizeof(addr);
struct sockaddr_in *addr_in;
int fd, ret;
if (getsockname(server_fd, (struct sockaddr *)&addr, &addrlen)) {
log_err("Failed to get server addr");
return -1;
}
addr_in = (struct sockaddr_in *)&addr;
fd = socket(addr_in->sin_family, SOCK_STREAM, 0);
if (fd < 0) {
log_err("Failed to create client socket");
return -1;
}
if (settimeo(fd, timeout_ms))
goto error_close;
ret = sendto(fd, data, data_len, MSG_FASTOPEN, (struct sockaddr *)&addr,
addrlen);
if (ret != data_len) {
log_err("sendto(data, %u) != %d\n", data_len, ret);
goto error_close;
}
return fd;
error_close:
save_errno_close(fd);
return -1;
}
static int connect_fd_to_addr(int fd,
const struct sockaddr_storage *addr,
socklen_t addrlen, const bool must_fail)
{
int ret;
errno = 0;
ret = connect(fd, (const struct sockaddr *)addr, addrlen);
if (must_fail) {
if (!ret) {
log_err("Unexpected success to connect to server");
return -1;
}
if (errno != EPERM) {
log_err("Unexpected error from connect to server");
return -1;
}
} else {
if (ret) {
log_err("Failed to connect to server");
return -1;
}
}
return 0;
}
int connect_to_addr(int type, const struct sockaddr_storage *addr, socklen_t addrlen,
const struct network_helper_opts *opts)
{
int fd;
if (!opts)
opts = &default_opts;
fd = socket(addr->ss_family, type, opts->proto);
if (fd < 0) {
log_err("Failed to create client socket");
return -1;
}
if (settimeo(fd, opts->timeout_ms))
goto error_close;
if (connect_fd_to_addr(fd, addr, addrlen, opts->must_fail))
goto error_close;
return fd;
error_close:
save_errno_close(fd);
return -1;
}
int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts)
{
struct sockaddr_storage addr;
struct sockaddr_in *addr_in;
socklen_t addrlen, optlen;
int fd, type, protocol;
if (!opts)
opts = &default_opts;
optlen = sizeof(type);
if (opts->type) {
type = opts->type;
} else {
if (getsockopt(server_fd, SOL_SOCKET, SO_TYPE, &type, &optlen)) {
log_err("getsockopt(SOL_TYPE)");
return -1;
}
}
if (opts->proto) {
protocol = opts->proto;
} else {
if (getsockopt(server_fd, SOL_SOCKET, SO_PROTOCOL, &protocol, &optlen)) {
log_err("getsockopt(SOL_PROTOCOL)");
return -1;
}
}
addrlen = sizeof(addr);
if (getsockname(server_fd, (struct sockaddr *)&addr, &addrlen)) {
log_err("Failed to get server addr");
return -1;
}
addr_in = (struct sockaddr_in *)&addr;
fd = socket(addr_in->sin_family, type, protocol);
if (fd < 0) {
log_err("Failed to create client socket");
return -1;
}
if (settimeo(fd, opts->timeout_ms))
goto error_close;
if (opts->cc && opts->cc[0] &&
setsockopt(fd, SOL_TCP, TCP_CONGESTION, opts->cc,
strlen(opts->cc) + 1))
goto error_close;
if (!opts->noconnect)
if (connect_fd_to_addr(fd, &addr, addrlen, opts->must_fail))
goto error_close;
return fd;
error_close:
save_errno_close(fd);
return -1;
}
int connect_to_fd(int server_fd, int timeout_ms)
{
struct network_helper_opts opts = {
.timeout_ms = timeout_ms,
};
return connect_to_fd_opts(server_fd, &opts);
}
int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms)
{
struct sockaddr_storage addr;
socklen_t len = sizeof(addr);
if (settimeo(client_fd, timeout_ms))
return -1;
if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
log_err("Failed to get server addr");
return -1;
}
if (connect_fd_to_addr(client_fd, &addr, len, false))
return -1;
return 0;
}
int make_sockaddr(int family, const char *addr_str, __u16 port,
struct sockaddr_storage *addr, socklen_t *len)
{
if (family == AF_INET) {
struct sockaddr_in *sin = (void *)addr;
memset(addr, 0, sizeof(*sin));
sin->sin_family = AF_INET;
sin->sin_port = htons(port);
if (addr_str &&
inet_pton(AF_INET, addr_str, &sin->sin_addr) != 1) {
log_err("inet_pton(AF_INET, %s)", addr_str);
return -1;
}
if (len)
*len = sizeof(*sin);
return 0;
} else if (family == AF_INET6) {
struct sockaddr_in6 *sin6 = (void *)addr;
memset(addr, 0, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_port = htons(port);
if (addr_str &&
inet_pton(AF_INET6, addr_str, &sin6->sin6_addr) != 1) {
log_err("inet_pton(AF_INET6, %s)", addr_str);
return -1;
}
if (len)
*len = sizeof(*sin6);
return 0;
} else if (family == AF_UNIX) {
/* Note that we always use abstract unix sockets to avoid having
* to clean up leftover files.
*/
struct sockaddr_un *sun = (void *)addr;
memset(addr, 0, sizeof(*sun));
sun->sun_family = family;
sun->sun_path[0] = 0;
strcpy(sun->sun_path + 1, addr_str);
if (len)
*len = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(addr_str);
return 0;
}
return -1;
}
char *ping_command(int family)
{
if (family == AF_INET6) {
/* On some systems 'ping' doesn't support IPv6, so use ping6 if it is present. */
if (!system("which ping6 >/dev/null 2>&1"))
return "ping6";
else
return "ping -6";
}
return "ping";
}
struct nstoken {
int orig_netns_fd;
};
struct nstoken *open_netns(const char *name)
{
int nsfd;
char nspath[PATH_MAX];
int err;
struct nstoken *token;
token = calloc(1, sizeof(struct nstoken));
if (!token) {
log_err("Failed to malloc token");
return NULL;
}
token->orig_netns_fd = open("/proc/self/ns/net", O_RDONLY);
if (token->orig_netns_fd == -1) {
log_err("Failed to open(/proc/self/ns/net)");
goto fail;
}
snprintf(nspath, sizeof(nspath), "%s/%s", "/var/run/netns", name);
nsfd = open(nspath, O_RDONLY | O_CLOEXEC);
if (nsfd == -1) {
log_err("Failed to open(%s)", nspath);
goto fail;
}
err = setns(nsfd, CLONE_NEWNET);
close(nsfd);
if (err) {
log_err("Failed to setns(nsfd)");
goto fail;
}
return token;
fail:
if (token->orig_netns_fd != -1)
close(token->orig_netns_fd);
free(token);
return NULL;
}
void close_netns(struct nstoken *token)
{
if (!token)
return;
if (setns(token->orig_netns_fd, CLONE_NEWNET))
log_err("Failed to setns(orig_netns_fd)");
close(token->orig_netns_fd);
free(token);
}
int get_socket_local_port(int sock_fd)
{
struct sockaddr_storage addr;
socklen_t addrlen = sizeof(addr);
int err;
err = getsockname(sock_fd, (struct sockaddr *)&addr, &addrlen);
if (err < 0)
return err;
if (addr.ss_family == AF_INET) {
struct sockaddr_in *sin = (struct sockaddr_in *)&addr;
return sin->sin_port;
} else if (addr.ss_family == AF_INET6) {
struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&addr;
return sin->sin6_port;
}
return -1;
}
int get_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param)
{
struct ifreq ifr = {0};
int sockfd, err;
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
return -errno;
memcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
ring_param->cmd = ETHTOOL_GRINGPARAM;
ifr.ifr_data = (char *)ring_param;
if (ioctl(sockfd, SIOCETHTOOL, &ifr) < 0) {
err = errno;
close(sockfd);
return -err;
}
close(sockfd);
return 0;
}
int set_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param)
{
struct ifreq ifr = {0};
int sockfd, err;
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
return -errno;
memcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
ring_param->cmd = ETHTOOL_SRINGPARAM;
ifr.ifr_data = (char *)ring_param;
if (ioctl(sockfd, SIOCETHTOOL, &ifr) < 0) {
err = errno;
close(sockfd);
return -err;
}
close(sockfd);
return 0;
}
struct send_recv_arg {
int fd;
uint32_t bytes;
int stop;
};
static void *send_recv_server(void *arg)
{
struct send_recv_arg *a = (struct send_recv_arg *)arg;
ssize_t nr_sent = 0, bytes = 0;
char batch[1500];
int err = 0, fd;
fd = accept(a->fd, NULL, NULL);
while (fd == -1) {
if (errno == EINTR)
continue;
err = -errno;
goto done;
}
if (settimeo(fd, 0)) {
err = -errno;
goto done;
}
while (bytes < a->bytes && !READ_ONCE(a->stop)) {
nr_sent = send(fd, &batch,
MIN(a->bytes - bytes, sizeof(batch)), 0);
if (nr_sent == -1 && errno == EINTR)
continue;
if (nr_sent == -1) {
err = -errno;
break;
}
bytes += nr_sent;
}
if (bytes != a->bytes) {
log_err("send %zd expected %u", bytes, a->bytes);
if (!err)
err = bytes > a->bytes ? -E2BIG : -EINTR;
}
done:
if (fd >= 0)
close(fd);
if (err) {
WRITE_ONCE(a->stop, 1);
return ERR_PTR(err);
}
return NULL;
}
int send_recv_data(int lfd, int fd, uint32_t total_bytes)
{
ssize_t nr_recv = 0, bytes = 0;
struct send_recv_arg arg = {
.fd = lfd,
.bytes = total_bytes,
.stop = 0,
};
pthread_t srv_thread;
void *thread_ret;
char batch[1500];
int err = 0;
err = pthread_create(&srv_thread, NULL, send_recv_server, (void *)&arg);
if (err) {
log_err("Failed to pthread_create");
return err;
}
/* recv total_bytes */
while (bytes < total_bytes && !READ_ONCE(arg.stop)) {
nr_recv = recv(fd, &batch,
MIN(total_bytes - bytes, sizeof(batch)), 0);
if (nr_recv == -1 && errno == EINTR)
continue;
if (nr_recv == -1) {
err = -errno;
break;
}
bytes += nr_recv;
}
if (bytes != total_bytes) {
log_err("recv %zd expected %u", bytes, total_bytes);
if (!err)
err = bytes > total_bytes ? -E2BIG : -EINTR;
}
WRITE_ONCE(arg.stop, 1);
pthread_join(srv_thread, &thread_ret);
if (IS_ERR(thread_ret)) {
log_err("Failed in thread_ret %ld", PTR_ERR(thread_ret));
err = err ? : PTR_ERR(thread_ret);
}
return err;
}
|