1 // SPDX-License-Identifier: GPL-2.0-only
2 #define _GNU_SOURCE
3
4 #include <errno.h>
5 #include <stdbool.h>
6 #include <stdio.h>
7 #include <string.h>
8 #include <unistd.h>
9 #include <sched.h>
10
11 #include <arpa/inet.h>
12 #include <sys/mount.h>
13 #include <sys/stat.h>
14
15 #include <linux/err.h>
16 #include <linux/in.h>
17 #include <linux/in6.h>
18 #include <linux/limits.h>
19
20 #include "bpf_util.h"
21 #include "network_helpers.h"
22 #include "test_progs.h"
23
24 #ifndef IPPROTO_MPTCP
25 #define IPPROTO_MPTCP 262
26 #endif
27
28 #define clean_errno() (errno == 0 ? "None" : strerror(errno))
29 #define log_err(MSG, ...) ({ \
30 int __save = errno; \
31 fprintf(stderr, "(%s:%d: errno: %s) " MSG "\n", \
32 __FILE__, __LINE__, clean_errno(), \
33 ##__VA_ARGS__); \
34 errno = __save; \
35 })
36
37 struct ipv4_packet pkt_v4 = {
38 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
39 .iph.ihl = 5,
40 .iph.protocol = IPPROTO_TCP,
41 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
42 .tcp.urg_ptr = 123,
43 .tcp.doff = 5,
44 };
45
46 struct ipv6_packet pkt_v6 = {
47 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
48 .iph.nexthdr = IPPROTO_TCP,
49 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
50 .tcp.urg_ptr = 123,
51 .tcp.doff = 5,
52 };
53
settimeo(int fd,int timeout_ms)54 int settimeo(int fd, int timeout_ms)
55 {
56 struct timeval timeout = { .tv_sec = 3 };
57
58 if (timeout_ms > 0) {
59 timeout.tv_sec = timeout_ms / 1000;
60 timeout.tv_usec = (timeout_ms % 1000) * 1000;
61 }
62
63 if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout,
64 sizeof(timeout))) {
65 log_err("Failed to set SO_RCVTIMEO");
66 return -1;
67 }
68
69 if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeout,
70 sizeof(timeout))) {
71 log_err("Failed to set SO_SNDTIMEO");
72 return -1;
73 }
74
75 return 0;
76 }
77
78 #define save_errno_close(fd) ({ int __save = errno; close(fd); errno = __save; })
79
__start_server(int type,int protocol,const struct sockaddr * addr,socklen_t addrlen,int timeout_ms,bool reuseport)80 static int __start_server(int type, int protocol, const struct sockaddr *addr,
81 socklen_t addrlen, int timeout_ms, bool reuseport)
82 {
83 int on = 1;
84 int fd;
85
86 fd = socket(addr->sa_family, type, protocol);
87 if (fd < 0) {
88 log_err("Failed to create server socket");
89 return -1;
90 }
91
92 if (settimeo(fd, timeout_ms))
93 goto error_close;
94
95 if (reuseport &&
96 setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on))) {
97 log_err("Failed to set SO_REUSEPORT");
98 goto error_close;
99 }
100
101 if (bind(fd, addr, addrlen) < 0) {
102 log_err("Failed to bind socket");
103 goto error_close;
104 }
105
106 if (type == SOCK_STREAM) {
107 if (listen(fd, 1) < 0) {
108 log_err("Failed to listed on socket");
109 goto error_close;
110 }
111 }
112
113 return fd;
114
115 error_close:
116 save_errno_close(fd);
117 return -1;
118 }
119
start_server_proto(int family,int type,int protocol,const char * addr_str,__u16 port,int timeout_ms)120 static int start_server_proto(int family, int type, int protocol,
121 const char *addr_str, __u16 port, int timeout_ms)
122 {
123 struct sockaddr_storage addr;
124 socklen_t addrlen;
125
126 if (make_sockaddr(family, addr_str, port, &addr, &addrlen))
127 return -1;
128
129 return __start_server(type, protocol, (struct sockaddr *)&addr,
130 addrlen, timeout_ms, false);
131 }
132
start_server(int family,int type,const char * addr_str,__u16 port,int timeout_ms)133 int start_server(int family, int type, const char *addr_str, __u16 port,
134 int timeout_ms)
135 {
136 return start_server_proto(family, type, 0, addr_str, port, timeout_ms);
137 }
138
start_mptcp_server(int family,const char * addr_str,__u16 port,int timeout_ms)139 int start_mptcp_server(int family, const char *addr_str, __u16 port,
140 int timeout_ms)
141 {
142 return start_server_proto(family, SOCK_STREAM, IPPROTO_MPTCP, addr_str,
143 port, timeout_ms);
144 }
145
start_reuseport_server(int family,int type,const char * addr_str,__u16 port,int timeout_ms,unsigned int nr_listens)146 int *start_reuseport_server(int family, int type, const char *addr_str,
147 __u16 port, int timeout_ms, unsigned int nr_listens)
148 {
149 struct sockaddr_storage addr;
150 unsigned int nr_fds = 0;
151 socklen_t addrlen;
152 int *fds;
153
154 if (!nr_listens)
155 return NULL;
156
157 if (make_sockaddr(family, addr_str, port, &addr, &addrlen))
158 return NULL;
159
160 fds = malloc(sizeof(*fds) * nr_listens);
161 if (!fds)
162 return NULL;
163
164 fds[0] = __start_server(type, 0, (struct sockaddr *)&addr, addrlen,
165 timeout_ms, true);
166 if (fds[0] == -1)
167 goto close_fds;
168 nr_fds = 1;
169
170 if (getsockname(fds[0], (struct sockaddr *)&addr, &addrlen))
171 goto close_fds;
172
173 for (; nr_fds < nr_listens; nr_fds++) {
174 fds[nr_fds] = __start_server(type, 0, (struct sockaddr *)&addr,
175 addrlen, timeout_ms, true);
176 if (fds[nr_fds] == -1)
177 goto close_fds;
178 }
179
180 return fds;
181
182 close_fds:
183 free_fds(fds, nr_fds);
184 return NULL;
185 }
186
free_fds(int * fds,unsigned int nr_close_fds)187 void free_fds(int *fds, unsigned int nr_close_fds)
188 {
189 if (fds) {
190 while (nr_close_fds)
191 close(fds[--nr_close_fds]);
192 free(fds);
193 }
194 }
195
fastopen_connect(int server_fd,const char * data,unsigned int data_len,int timeout_ms)196 int fastopen_connect(int server_fd, const char *data, unsigned int data_len,
197 int timeout_ms)
198 {
199 struct sockaddr_storage addr;
200 socklen_t addrlen = sizeof(addr);
201 struct sockaddr_in *addr_in;
202 int fd, ret;
203
204 if (getsockname(server_fd, (struct sockaddr *)&addr, &addrlen)) {
205 log_err("Failed to get server addr");
206 return -1;
207 }
208
209 addr_in = (struct sockaddr_in *)&addr;
210 fd = socket(addr_in->sin_family, SOCK_STREAM, 0);
211 if (fd < 0) {
212 log_err("Failed to create client socket");
213 return -1;
214 }
215
216 if (settimeo(fd, timeout_ms))
217 goto error_close;
218
219 ret = sendto(fd, data, data_len, MSG_FASTOPEN, (struct sockaddr *)&addr,
220 addrlen);
221 if (ret != data_len) {
222 log_err("sendto(data, %u) != %d\n", data_len, ret);
223 goto error_close;
224 }
225
226 return fd;
227
228 error_close:
229 save_errno_close(fd);
230 return -1;
231 }
232
connect_fd_to_addr(int fd,const struct sockaddr_storage * addr,socklen_t addrlen,const bool must_fail)233 static int connect_fd_to_addr(int fd,
234 const struct sockaddr_storage *addr,
235 socklen_t addrlen, const bool must_fail)
236 {
237 int ret;
238
239 errno = 0;
240 ret = connect(fd, (const struct sockaddr *)addr, addrlen);
241 if (must_fail) {
242 if (!ret) {
243 log_err("Unexpected success to connect to server");
244 return -1;
245 }
246 if (errno != EPERM) {
247 log_err("Unexpected error from connect to server");
248 return -1;
249 }
250 } else {
251 if (ret) {
252 log_err("Failed to connect to server");
253 return -1;
254 }
255 }
256
257 return 0;
258 }
259
260 static const struct network_helper_opts default_opts;
261
connect_to_fd_opts(int server_fd,const struct network_helper_opts * opts)262 int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts)
263 {
264 struct sockaddr_storage addr;
265 struct sockaddr_in *addr_in;
266 socklen_t addrlen, optlen;
267 int fd, type, protocol;
268
269 if (!opts)
270 opts = &default_opts;
271
272 optlen = sizeof(type);
273
274 if (opts->type) {
275 type = opts->type;
276 } else {
277 if (getsockopt(server_fd, SOL_SOCKET, SO_TYPE, &type, &optlen)) {
278 log_err("getsockopt(SOL_TYPE)");
279 return -1;
280 }
281 }
282
283 if (opts->proto) {
284 protocol = opts->proto;
285 } else {
286 if (getsockopt(server_fd, SOL_SOCKET, SO_PROTOCOL, &protocol, &optlen)) {
287 log_err("getsockopt(SOL_PROTOCOL)");
288 return -1;
289 }
290 }
291
292 addrlen = sizeof(addr);
293 if (getsockname(server_fd, (struct sockaddr *)&addr, &addrlen)) {
294 log_err("Failed to get server addr");
295 return -1;
296 }
297
298 addr_in = (struct sockaddr_in *)&addr;
299 fd = socket(addr_in->sin_family, type, protocol);
300 if (fd < 0) {
301 log_err("Failed to create client socket");
302 return -1;
303 }
304
305 if (settimeo(fd, opts->timeout_ms))
306 goto error_close;
307
308 if (opts->cc && opts->cc[0] &&
309 setsockopt(fd, SOL_TCP, TCP_CONGESTION, opts->cc,
310 strlen(opts->cc) + 1))
311 goto error_close;
312
313 if (!opts->noconnect)
314 if (connect_fd_to_addr(fd, &addr, addrlen, opts->must_fail))
315 goto error_close;
316
317 return fd;
318
319 error_close:
320 save_errno_close(fd);
321 return -1;
322 }
323
connect_to_fd(int server_fd,int timeout_ms)324 int connect_to_fd(int server_fd, int timeout_ms)
325 {
326 struct network_helper_opts opts = {
327 .timeout_ms = timeout_ms,
328 };
329
330 return connect_to_fd_opts(server_fd, &opts);
331 }
332
connect_fd_to_fd(int client_fd,int server_fd,int timeout_ms)333 int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms)
334 {
335 struct sockaddr_storage addr;
336 socklen_t len = sizeof(addr);
337
338 if (settimeo(client_fd, timeout_ms))
339 return -1;
340
341 if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
342 log_err("Failed to get server addr");
343 return -1;
344 }
345
346 if (connect_fd_to_addr(client_fd, &addr, len, false))
347 return -1;
348
349 return 0;
350 }
351
make_sockaddr(int family,const char * addr_str,__u16 port,struct sockaddr_storage * addr,socklen_t * len)352 int make_sockaddr(int family, const char *addr_str, __u16 port,
353 struct sockaddr_storage *addr, socklen_t *len)
354 {
355 if (family == AF_INET) {
356 struct sockaddr_in *sin = (void *)addr;
357
358 memset(addr, 0, sizeof(*sin));
359 sin->sin_family = AF_INET;
360 sin->sin_port = htons(port);
361 if (addr_str &&
362 inet_pton(AF_INET, addr_str, &sin->sin_addr) != 1) {
363 log_err("inet_pton(AF_INET, %s)", addr_str);
364 return -1;
365 }
366 if (len)
367 *len = sizeof(*sin);
368 return 0;
369 } else if (family == AF_INET6) {
370 struct sockaddr_in6 *sin6 = (void *)addr;
371
372 memset(addr, 0, sizeof(*sin6));
373 sin6->sin6_family = AF_INET6;
374 sin6->sin6_port = htons(port);
375 if (addr_str &&
376 inet_pton(AF_INET6, addr_str, &sin6->sin6_addr) != 1) {
377 log_err("inet_pton(AF_INET6, %s)", addr_str);
378 return -1;
379 }
380 if (len)
381 *len = sizeof(*sin6);
382 return 0;
383 }
384 return -1;
385 }
386
ping_command(int family)387 char *ping_command(int family)
388 {
389 if (family == AF_INET6) {
390 /* On some systems 'ping' doesn't support IPv6, so use ping6 if it is present. */
391 if (!system("which ping6 >/dev/null 2>&1"))
392 return "ping6";
393 else
394 return "ping -6";
395 }
396 return "ping";
397 }
398
399 struct nstoken {
400 int orig_netns_fd;
401 };
402
open_netns(const char * name)403 struct nstoken *open_netns(const char *name)
404 {
405 int nsfd;
406 char nspath[PATH_MAX];
407 int err;
408 struct nstoken *token;
409
410 token = calloc(1, sizeof(struct nstoken));
411 if (!ASSERT_OK_PTR(token, "malloc token"))
412 return NULL;
413
414 token->orig_netns_fd = open("/proc/self/ns/net", O_RDONLY);
415 if (!ASSERT_GE(token->orig_netns_fd, 0, "open /proc/self/ns/net"))
416 goto fail;
417
418 snprintf(nspath, sizeof(nspath), "%s/%s", "/var/run/netns", name);
419 nsfd = open(nspath, O_RDONLY | O_CLOEXEC);
420 if (!ASSERT_GE(nsfd, 0, "open netns fd"))
421 goto fail;
422
423 err = setns(nsfd, CLONE_NEWNET);
424 close(nsfd);
425 if (!ASSERT_OK(err, "setns"))
426 goto fail;
427
428 return token;
429 fail:
430 if (token->orig_netns_fd != -1)
431 close(token->orig_netns_fd);
432 free(token);
433 return NULL;
434 }
435
close_netns(struct nstoken * token)436 void close_netns(struct nstoken *token)
437 {
438 if (!token)
439 return;
440
441 ASSERT_OK(setns(token->orig_netns_fd, CLONE_NEWNET), "setns");
442 close(token->orig_netns_fd);
443 free(token);
444 }
445
get_socket_local_port(int sock_fd)446 int get_socket_local_port(int sock_fd)
447 {
448 struct sockaddr_storage addr;
449 socklen_t addrlen = sizeof(addr);
450 int err;
451
452 err = getsockname(sock_fd, (struct sockaddr *)&addr, &addrlen);
453 if (err < 0)
454 return err;
455
456 if (addr.ss_family == AF_INET) {
457 struct sockaddr_in *sin = (struct sockaddr_in *)&addr;
458
459 return sin->sin_port;
460 } else if (addr.ss_family == AF_INET6) {
461 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&addr;
462
463 return sin->sin6_port;
464 }
465
466 return -1;
467 }
468