1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2018 Facebook */
3
4 #include <stdlib.h>
5 #include <unistd.h>
6 #include <stdbool.h>
7 #include <string.h>
8 #include <errno.h>
9 #include <assert.h>
10 #include <fcntl.h>
11 #include <linux/bpf.h>
12 #include <linux/err.h>
13 #include <linux/types.h>
14 #include <linux/if_ether.h>
15 #include <sys/types.h>
16 #include <sys/epoll.h>
17 #include <sys/socket.h>
18 #include <netinet/in.h>
19 #include <bpf/bpf.h>
20 #include <bpf/libbpf.h>
21 #include "bpf_util.h"
22
23 #include "test_progs.h"
24 #include "test_select_reuseport_common.h"
25
26 #define MAX_TEST_NAME 80
27 #define MIN_TCPHDR_LEN 20
28 #define UDPHDR_LEN 8
29
30 #define TCP_SYNCOOKIE_SYSCTL "/proc/sys/net/ipv4/tcp_syncookies"
31 #define TCP_FO_SYSCTL "/proc/sys/net/ipv4/tcp_fastopen"
32 #define REUSEPORT_ARRAY_SIZE 32
33
34 static int result_map, tmp_index_ovr_map, linum_map, data_check_map;
35 static __u32 expected_results[NR_RESULTS];
36 static int sk_fds[REUSEPORT_ARRAY_SIZE];
37 static int reuseport_array = -1, outer_map = -1;
38 static enum bpf_map_type inner_map_type;
39 static int select_by_skb_data_prog;
40 static int saved_tcp_syncookie = -1;
41 static struct bpf_object *obj;
42 static int saved_tcp_fo = -1;
43 static __u32 index_zero;
44 static int epfd;
45
46 static union sa46 {
47 struct sockaddr_in6 v6;
48 struct sockaddr_in v4;
49 sa_family_t family;
50 } srv_sa;
51
52 #define RET_IF(condition, tag, format...) ({ \
53 if (CHECK_FAIL(condition)) { \
54 printf(tag " " format); \
55 return; \
56 } \
57 })
58
59 #define RET_ERR(condition, tag, format...) ({ \
60 if (CHECK_FAIL(condition)) { \
61 printf(tag " " format); \
62 return -1; \
63 } \
64 })
65
66 static int create_maps(enum bpf_map_type inner_type)
67 {
68 LIBBPF_OPTS(bpf_map_create_opts, opts);
69
70 inner_map_type = inner_type;
71
72 /* Creating reuseport_array */
73 reuseport_array = bpf_map_create(inner_type, "reuseport_array",
74 sizeof(__u32), sizeof(__u32), REUSEPORT_ARRAY_SIZE, NULL);
75 RET_ERR(reuseport_array < 0, "creating reuseport_array",
76 "reuseport_array:%d errno:%d\n", reuseport_array, errno);
77
78 /* Creating outer_map */
79 opts.inner_map_fd = reuseport_array;
80 outer_map = bpf_map_create(BPF_MAP_TYPE_ARRAY_OF_MAPS, "outer_map",
81 sizeof(__u32), sizeof(__u32), 1, &opts);
82 RET_ERR(outer_map < 0, "creating outer_map",
83 "outer_map:%d errno:%d\n", outer_map, errno);
84
85 return 0;
86 }
87
88 static int prepare_bpf_obj(void)
89 {
90 struct bpf_program *prog;
91 struct bpf_map *map;
92 int err;
93
94 obj = bpf_object__open("test_select_reuseport_kern.bpf.o");
95 err = libbpf_get_error(obj);
96 RET_ERR(err, "open test_select_reuseport_kern.bpf.o",
97 "obj:%p PTR_ERR(obj):%d\n", obj, err);
98
99 map = bpf_object__find_map_by_name(obj, "outer_map");
100 RET_ERR(!map, "find outer_map", "!map\n");
101 err = bpf_map__reuse_fd(map, outer_map);
102 RET_ERR(err, "reuse outer_map", "err:%d\n", err);
103
104 err = bpf_object__load(obj);
105 RET_ERR(err, "load bpf_object", "err:%d\n", err);
106
107 prog = bpf_object__next_program(obj, NULL);
108 RET_ERR(!prog, "get first bpf_program", "!prog\n");
109 select_by_skb_data_prog = bpf_program__fd(prog);
110 RET_ERR(select_by_skb_data_prog < 0, "get prog fd",
111 "select_by_skb_data_prog:%d\n", select_by_skb_data_prog);
112
113 map = bpf_object__find_map_by_name(obj, "result_map");
114 RET_ERR(!map, "find result_map", "!map\n");
115 result_map = bpf_map__fd(map);
116 RET_ERR(result_map < 0, "get result_map fd",
117 "result_map:%d\n", result_map);
118
119 map = bpf_object__find_map_by_name(obj, "tmp_index_ovr_map");
120 RET_ERR(!map, "find tmp_index_ovr_map\n", "!map");
121 tmp_index_ovr_map = bpf_map__fd(map);
122 RET_ERR(tmp_index_ovr_map < 0, "get tmp_index_ovr_map fd",
123 "tmp_index_ovr_map:%d\n", tmp_index_ovr_map);
124
125 map = bpf_object__find_map_by_name(obj, "linum_map");
126 RET_ERR(!map, "find linum_map", "!map\n");
127 linum_map = bpf_map__fd(map);
128 RET_ERR(linum_map < 0, "get linum_map fd",
129 "linum_map:%d\n", linum_map);
130
131 map = bpf_object__find_map_by_name(obj, "data_check_map");
132 RET_ERR(!map, "find data_check_map", "!map\n");
133 data_check_map = bpf_map__fd(map);
134 RET_ERR(data_check_map < 0, "get data_check_map fd",
135 "data_check_map:%d\n", data_check_map);
136
137 return 0;
138 }
139
140 static void sa46_init_loopback(union sa46 *sa, sa_family_t family)
141 {
142 memset(sa, 0, sizeof(*sa));
143 sa->family = family;
144 if (sa->family == AF_INET6)
145 sa->v6.sin6_addr = in6addr_loopback;
146 else
147 sa->v4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
148 }
149
150 static void sa46_init_inany(union sa46 *sa, sa_family_t family)
151 {
152 memset(sa, 0, sizeof(*sa));
153 sa->family = family;
154 if (sa->family == AF_INET6)
155 sa->v6.sin6_addr = in6addr_any;
156 else
157 sa->v4.sin_addr.s_addr = INADDR_ANY;
158 }
159
160 static int read_int_sysctl(const char *sysctl)
161 {
162 char buf[16];
163 int fd, ret;
164
165 fd = open(sysctl, 0);
166 RET_ERR(fd == -1, "open(sysctl)",
167 "sysctl:%s fd:%d errno:%d\n", sysctl, fd, errno);
168
169 ret = read(fd, buf, sizeof(buf));
170 RET_ERR(ret <= 0, "read(sysctl)",
171 "sysctl:%s ret:%d errno:%d\n", sysctl, ret, errno);
172
173 close(fd);
174 return atoi(buf);
175 }
176
177 static int write_int_sysctl(const char *sysctl, int v)
178 {
179 int fd, ret, size;
180 char buf[16];
181
182 fd = open(sysctl, O_RDWR);
183 RET_ERR(fd == -1, "open(sysctl)",
184 "sysctl:%s fd:%d errno:%d\n", sysctl, fd, errno);
185
186 size = snprintf(buf, sizeof(buf), "%d", v);
187 ret = write(fd, buf, size);
188 RET_ERR(ret != size, "write(sysctl)",
189 "sysctl:%s ret:%d size:%d errno:%d\n",
190 sysctl, ret, size, errno);
191
192 close(fd);
193 return 0;
194 }
195
196 static void restore_sysctls(void)
197 {
198 if (saved_tcp_fo != -1)
199 write_int_sysctl(TCP_FO_SYSCTL, saved_tcp_fo);
200 if (saved_tcp_syncookie != -1)
201 write_int_sysctl(TCP_SYNCOOKIE_SYSCTL, saved_tcp_syncookie);
202 }
203
204 static int enable_fastopen(void)
205 {
206 int fo;
207
208 fo = read_int_sysctl(TCP_FO_SYSCTL);
209 if (fo < 0)
210 return -1;
211
212 return write_int_sysctl(TCP_FO_SYSCTL, fo | 7);
213 }
214
215 static int enable_syncookie(void)
216 {
217 return write_int_sysctl(TCP_SYNCOOKIE_SYSCTL, 2);
218 }
219
220 static int disable_syncookie(void)
221 {
222 return write_int_sysctl(TCP_SYNCOOKIE_SYSCTL, 0);
223 }
224
225 static long get_linum(void)
226 {
227 __u32 linum;
228 int err;
229
230 err = bpf_map_lookup_elem(linum_map, &index_zero, &linum);
231 RET_ERR(err < 0, "lookup_elem(linum_map)", "err:%d errno:%d\n",
232 err, errno);
233
234 return linum;
235 }
236
237 static void check_data(int type, sa_family_t family, const struct cmd *cmd,
238 int cli_fd)
239 {
240 struct data_check expected = {}, result;
241 union sa46 cli_sa;
242 socklen_t addrlen;
243 int err;
244
245 addrlen = sizeof(cli_sa);
246 err = getsockname(cli_fd, (struct sockaddr *)&cli_sa,
247 &addrlen);
248 RET_IF(err < 0, "getsockname(cli_fd)", "err:%d errno:%d\n",
249 err, errno);
250
251 err = bpf_map_lookup_elem(data_check_map, &index_zero, &result);
252 RET_IF(err < 0, "lookup_elem(data_check_map)", "err:%d errno:%d\n",
253 err, errno);
254
255 if (type == SOCK_STREAM) {
256 expected.len = MIN_TCPHDR_LEN;
257 expected.ip_protocol = IPPROTO_TCP;
258 } else {
259 expected.len = UDPHDR_LEN;
260 expected.ip_protocol = IPPROTO_UDP;
261 }
262
263 if (family == AF_INET6) {
264 expected.eth_protocol = htons(ETH_P_IPV6);
265 expected.bind_inany = !srv_sa.v6.sin6_addr.s6_addr32[3] &&
266 !srv_sa.v6.sin6_addr.s6_addr32[2] &&
267 !srv_sa.v6.sin6_addr.s6_addr32[1] &&
268 !srv_sa.v6.sin6_addr.s6_addr32[0];
269
270 memcpy(&expected.skb_addrs[0], cli_sa.v6.sin6_addr.s6_addr32,
271 sizeof(cli_sa.v6.sin6_addr));
272 memcpy(&expected.skb_addrs[4], &in6addr_loopback,
273 sizeof(in6addr_loopback));
274 expected.skb_ports[0] = cli_sa.v6.sin6_port;
275 expected.skb_ports[1] = srv_sa.v6.sin6_port;
276 } else {
277 expected.eth_protocol = htons(ETH_P_IP);
278 expected.bind_inany = !srv_sa.v4.sin_addr.s_addr;
279
280 expected.skb_addrs[0] = cli_sa.v4.sin_addr.s_addr;
281 expected.skb_addrs[1] = htonl(INADDR_LOOPBACK);
282 expected.skb_ports[0] = cli_sa.v4.sin_port;
283 expected.skb_ports[1] = srv_sa.v4.sin_port;
284 }
285
286 if (memcmp(&result, &expected, offsetof(struct data_check,
287 equal_check_end))) {
288 printf("unexpected data_check\n");
289 printf(" result: (0x%x, %u, %u)\n",
290 result.eth_protocol, result.ip_protocol,
291 result.bind_inany);
292 printf("expected: (0x%x, %u, %u)\n",
293 expected.eth_protocol, expected.ip_protocol,
294 expected.bind_inany);
295 RET_IF(1, "data_check result != expected",
296 "bpf_prog_linum:%ld\n", get_linum());
297 }
298
299 RET_IF(!result.hash, "data_check result.hash empty",
300 "result.hash:%u", result.hash);
301
302 expected.len += cmd ? sizeof(*cmd) : 0;
303 if (type == SOCK_STREAM)
304 RET_IF(expected.len > result.len, "expected.len > result.len",
305 "expected.len:%u result.len:%u bpf_prog_linum:%ld\n",
306 expected.len, result.len, get_linum());
307 else
308 RET_IF(expected.len != result.len, "expected.len != result.len",
309 "expected.len:%u result.len:%u bpf_prog_linum:%ld\n",
310 expected.len, result.len, get_linum());
311 }
312
313 static const char *result_to_str(enum result res)
314 {
315 switch (res) {
316 case DROP_ERR_INNER_MAP:
317 return "DROP_ERR_INNER_MAP";
318 case DROP_ERR_SKB_DATA:
319 return "DROP_ERR_SKB_DATA";
320 case DROP_ERR_SK_SELECT_REUSEPORT:
321 return "DROP_ERR_SK_SELECT_REUSEPORT";
322 case DROP_MISC:
323 return "DROP_MISC";
324 case PASS:
325 return "PASS";
326 case PASS_ERR_SK_SELECT_REUSEPORT:
327 return "PASS_ERR_SK_SELECT_REUSEPORT";
328 default:
329 return "UNKNOWN";
330 }
331 }
332
333 static void check_results(void)
334 {
335 __u32 results[NR_RESULTS];
336 __u32 i, broken = 0;
337 int err;
338
339 for (i = 0; i < NR_RESULTS; i++) {
340 err = bpf_map_lookup_elem(result_map, &i, &results[i]);
341 RET_IF(err < 0, "lookup_elem(result_map)",
342 "i:%u err:%d errno:%d\n", i, err, errno);
343 }
344
345 for (i = 0; i < NR_RESULTS; i++) {
346 if (results[i] != expected_results[i]) {
347 broken = i;
348 break;
349 }
350 }
351
352 if (i == NR_RESULTS)
353 return;
354
355 printf("unexpected result\n");
356 printf(" result: [");
357 printf("%u", results[0]);
358 for (i = 1; i < NR_RESULTS; i++)
359 printf(", %u", results[i]);
360 printf("]\n");
361
362 printf("expected: [");
363 printf("%u", expected_results[0]);
364 for (i = 1; i < NR_RESULTS; i++)
365 printf(", %u", expected_results[i]);
366 printf("]\n");
367
368 printf("mismatch on %s (bpf_prog_linum:%ld)\n", result_to_str(broken),
369 get_linum());
370
371 CHECK_FAIL(true);
372 }
373
374 static int send_data(int type, sa_family_t family, void *data, size_t len,
375 enum result expected)
376 {
377 union sa46 cli_sa;
378 int fd, err;
379
380 fd = socket(family, type, 0);
381 RET_ERR(fd == -1, "socket()", "fd:%d errno:%d\n", fd, errno);
382
383 sa46_init_loopback(&cli_sa, family);
384 err = bind(fd, (struct sockaddr *)&cli_sa, sizeof(cli_sa));
385 RET_ERR(fd == -1, "bind(cli_sa)", "err:%d errno:%d\n", err, errno);
386
387 err = sendto(fd, data, len, MSG_FASTOPEN, (struct sockaddr *)&srv_sa,
388 sizeof(srv_sa));
389 RET_ERR(err != len && expected >= PASS,
390 "sendto()", "family:%u err:%d errno:%d expected:%d\n",
391 family, err, errno, expected);
392
393 return fd;
394 }
395
396 static void do_test(int type, sa_family_t family, struct cmd *cmd,
397 enum result expected)
398 {
399 int nev, srv_fd, cli_fd;
400 struct epoll_event ev;
401 struct cmd rcv_cmd;
402 ssize_t nread;
403
404 cli_fd = send_data(type, family, cmd, cmd ? sizeof(*cmd) : 0,
405 expected);
406 if (cli_fd < 0)
407 return;
408 nev = epoll_wait(epfd, &ev, 1, expected >= PASS ? 5 : 0);
409 RET_IF((nev <= 0 && expected >= PASS) ||
410 (nev > 0 && expected < PASS),
411 "nev <> expected",
412 "nev:%d expected:%d type:%d family:%d data:(%d, %d)\n",
413 nev, expected, type, family,
414 cmd ? cmd->reuseport_index : -1,
415 cmd ? cmd->pass_on_failure : -1);
416 check_results();
417 check_data(type, family, cmd, cli_fd);
418
419 if (expected < PASS)
420 return;
421
422 RET_IF(expected != PASS_ERR_SK_SELECT_REUSEPORT &&
423 cmd->reuseport_index != ev.data.u32,
424 "check cmd->reuseport_index",
425 "cmd:(%u, %u) ev.data.u32:%u\n",
426 cmd->pass_on_failure, cmd->reuseport_index, ev.data.u32);
427
428 srv_fd = sk_fds[ev.data.u32];
429 if (type == SOCK_STREAM) {
430 int new_fd = accept(srv_fd, NULL, 0);
431
432 RET_IF(new_fd == -1, "accept(srv_fd)",
433 "ev.data.u32:%u new_fd:%d errno:%d\n",
434 ev.data.u32, new_fd, errno);
435
436 nread = recv(new_fd, &rcv_cmd, sizeof(rcv_cmd), MSG_DONTWAIT);
437 RET_IF(nread != sizeof(rcv_cmd),
438 "recv(new_fd)",
439 "ev.data.u32:%u nread:%zd sizeof(rcv_cmd):%zu errno:%d\n",
440 ev.data.u32, nread, sizeof(rcv_cmd), errno);
441
442 close(new_fd);
443 } else {
444 nread = recv(srv_fd, &rcv_cmd, sizeof(rcv_cmd), MSG_DONTWAIT);
445 RET_IF(nread != sizeof(rcv_cmd),
446 "recv(sk_fds)",
447 "ev.data.u32:%u nread:%zd sizeof(rcv_cmd):%zu errno:%d\n",
448 ev.data.u32, nread, sizeof(rcv_cmd), errno);
449 }
450
451 close(cli_fd);
452 }
453
454 static void test_err_inner_map(int type, sa_family_t family)
455 {
456 struct cmd cmd = {
457 .reuseport_index = 0,
458 .pass_on_failure = 0,
459 };
460
461 expected_results[DROP_ERR_INNER_MAP]++;
462 do_test(type, family, &cmd, DROP_ERR_INNER_MAP);
463 }
464
465 static void test_err_skb_data(int type, sa_family_t family)
466 {
467 expected_results[DROP_ERR_SKB_DATA]++;
468 do_test(type, family, NULL, DROP_ERR_SKB_DATA);
469 }
470
471 static void test_err_sk_select_port(int type, sa_family_t family)
472 {
473 struct cmd cmd = {
474 .reuseport_index = REUSEPORT_ARRAY_SIZE,
475 .pass_on_failure = 0,
476 };
477
478 expected_results[DROP_ERR_SK_SELECT_REUSEPORT]++;
479 do_test(type, family, &cmd, DROP_ERR_SK_SELECT_REUSEPORT);
480 }
481
482 static void test_pass(int type, sa_family_t family)
483 {
484 struct cmd cmd;
485 int i;
486
487 cmd.pass_on_failure = 0;
488 for (i = 0; i < REUSEPORT_ARRAY_SIZE; i++) {
489 expected_results[PASS]++;
490 cmd.reuseport_index = i;
491 do_test(type, family, &cmd, PASS);
492 }
493 }
494
495 static void test_syncookie(int type, sa_family_t family)
496 {
497 int err, tmp_index = 1;
498 struct cmd cmd = {
499 .reuseport_index = 0,
500 .pass_on_failure = 0,
501 };
502
503 /*
504 * +1 for TCP-SYN and
505 * +1 for the TCP-ACK (ack the syncookie)
506 */
507 expected_results[PASS] += 2;
508 enable_syncookie();
509 /*
510 * Simulate TCP-SYN and TCP-ACK are handled by two different sk:
511 * TCP-SYN: select sk_fds[tmp_index = 1] tmp_index is from the
512 * tmp_index_ovr_map
513 * TCP-ACK: select sk_fds[reuseport_index = 0] reuseport_index
514 * is from the cmd.reuseport_index
515 */
516 err = bpf_map_update_elem(tmp_index_ovr_map, &index_zero,
517 &tmp_index, BPF_ANY);
518 RET_IF(err < 0, "update_elem(tmp_index_ovr_map, 0, 1)",
519 "err:%d errno:%d\n", err, errno);
520 do_test(type, family, &cmd, PASS);
521 err = bpf_map_lookup_elem(tmp_index_ovr_map, &index_zero,
522 &tmp_index);
523 RET_IF(err < 0 || tmp_index >= 0,
524 "lookup_elem(tmp_index_ovr_map)",
525 "err:%d errno:%d tmp_index:%d\n",
526 err, errno, tmp_index);
527 disable_syncookie();
528 }
529
530 static void test_pass_on_err(int type, sa_family_t family)
531 {
532 struct cmd cmd = {
533 .reuseport_index = REUSEPORT_ARRAY_SIZE,
534 .pass_on_failure = 1,
535 };
536
537 expected_results[PASS_ERR_SK_SELECT_REUSEPORT] += 1;
538 do_test(type, family, &cmd, PASS_ERR_SK_SELECT_REUSEPORT);
539 }
540
541 static void test_detach_bpf(int type, sa_family_t family)
542 {
543 #ifdef SO_DETACH_REUSEPORT_BPF
544 __u32 nr_run_before = 0, nr_run_after = 0, tmp, i;
545 struct epoll_event ev;
546 int cli_fd, err, nev;
547 struct cmd cmd = {};
548 int optvalue = 0;
549
550 err = setsockopt(sk_fds[0], SOL_SOCKET, SO_DETACH_REUSEPORT_BPF,
551 &optvalue, sizeof(optvalue));
552 RET_IF(err == -1, "setsockopt(SO_DETACH_REUSEPORT_BPF)",
553 "err:%d errno:%d\n", err, errno);
554
555 err = setsockopt(sk_fds[1], SOL_SOCKET, SO_DETACH_REUSEPORT_BPF,
556 &optvalue, sizeof(optvalue));
557 RET_IF(err == 0 || errno != ENOENT,
558 "setsockopt(SO_DETACH_REUSEPORT_BPF)",
559 "err:%d errno:%d\n", err, errno);
560
561 for (i = 0; i < NR_RESULTS; i++) {
562 err = bpf_map_lookup_elem(result_map, &i, &tmp);
563 RET_IF(err < 0, "lookup_elem(result_map)",
564 "i:%u err:%d errno:%d\n", i, err, errno);
565 nr_run_before += tmp;
566 }
567
568 cli_fd = send_data(type, family, &cmd, sizeof(cmd), PASS);
569 if (cli_fd < 0)
570 return;
571 nev = epoll_wait(epfd, &ev, 1, 5);
572 RET_IF(nev <= 0, "nev <= 0",
573 "nev:%d expected:1 type:%d family:%d data:(0, 0)\n",
574 nev, type, family);
575
576 for (i = 0; i < NR_RESULTS; i++) {
577 err = bpf_map_lookup_elem(result_map, &i, &tmp);
578 RET_IF(err < 0, "lookup_elem(result_map)",
579 "i:%u err:%d errno:%d\n", i, err, errno);
580 nr_run_after += tmp;
581 }
582
583 RET_IF(nr_run_before != nr_run_after,
584 "nr_run_before != nr_run_after",
585 "nr_run_before:%u nr_run_after:%u\n",
586 nr_run_before, nr_run_after);
587
588 close(cli_fd);
589 #else
590 test__skip();
591 #endif
592 }
593
594 static void prepare_sk_fds(int type, sa_family_t family, bool inany)
595 {
596 const int first = REUSEPORT_ARRAY_SIZE - 1;
597 int i, err, optval = 1;
598 struct epoll_event ev;
599 socklen_t addrlen;
600
601 if (inany)
602 sa46_init_inany(&srv_sa, family);
603 else
604 sa46_init_loopback(&srv_sa, family);
605 addrlen = sizeof(srv_sa);
606
607 /*
608 * The sk_fds[] is filled from the back such that the order
609 * is exactly opposite to the (struct sock_reuseport *)reuse->socks[].
610 */
611 for (i = first; i >= 0; i--) {
612 sk_fds[i] = socket(family, type, 0);
613 RET_IF(sk_fds[i] == -1, "socket()", "sk_fds[%d]:%d errno:%d\n",
614 i, sk_fds[i], errno);
615 err = setsockopt(sk_fds[i], SOL_SOCKET, SO_REUSEPORT,
616 &optval, sizeof(optval));
617 RET_IF(err == -1, "setsockopt(SO_REUSEPORT)",
618 "sk_fds[%d] err:%d errno:%d\n",
619 i, err, errno);
620
621 if (i == first) {
622 err = setsockopt(sk_fds[i], SOL_SOCKET,
623 SO_ATTACH_REUSEPORT_EBPF,
624 &select_by_skb_data_prog,
625 sizeof(select_by_skb_data_prog));
626 RET_IF(err < 0, "setsockopt(SO_ATTACH_REUEPORT_EBPF)",
627 "err:%d errno:%d\n", err, errno);
628 }
629
630 err = bind(sk_fds[i], (struct sockaddr *)&srv_sa, addrlen);
631 RET_IF(err < 0, "bind()", "sk_fds[%d] err:%d errno:%d\n",
632 i, err, errno);
633
634 if (type == SOCK_STREAM) {
635 err = listen(sk_fds[i], 10);
636 RET_IF(err < 0, "listen()",
637 "sk_fds[%d] err:%d errno:%d\n",
638 i, err, errno);
639 }
640
641 err = bpf_map_update_elem(reuseport_array, &i, &sk_fds[i],
642 BPF_NOEXIST);
643 RET_IF(err < 0, "update_elem(reuseport_array)",
644 "sk_fds[%d] err:%d errno:%d\n", i, err, errno);
645
646 if (i == first) {
647 socklen_t addrlen = sizeof(srv_sa);
648
649 err = getsockname(sk_fds[i], (struct sockaddr *)&srv_sa,
650 &addrlen);
651 RET_IF(err == -1, "getsockname()",
652 "sk_fds[%d] err:%d errno:%d\n", i, err, errno);
653 }
654 }
655
656 epfd = epoll_create(1);
657 RET_IF(epfd == -1, "epoll_create(1)",
658 "epfd:%d errno:%d\n", epfd, errno);
659
660 ev.events = EPOLLIN;
661 for (i = 0; i < REUSEPORT_ARRAY_SIZE; i++) {
662 ev.data.u32 = i;
663 err = epoll_ctl(epfd, EPOLL_CTL_ADD, sk_fds[i], &ev);
664 RET_IF(err, "epoll_ctl(EPOLL_CTL_ADD)", "sk_fds[%d]\n", i);
665 }
666 }
667
668 static void setup_per_test(int type, sa_family_t family, bool inany,
669 bool no_inner_map)
670 {
671 int ovr = -1, err;
672
673 prepare_sk_fds(type, family, inany);
674 err = bpf_map_update_elem(tmp_index_ovr_map, &index_zero, &ovr,
675 BPF_ANY);
676 RET_IF(err < 0, "update_elem(tmp_index_ovr_map, 0, -1)",
677 "err:%d errno:%d\n", err, errno);
678
679 /* Install reuseport_array to outer_map? */
680 if (no_inner_map)
681 return;
682
683 err = bpf_map_update_elem(outer_map, &index_zero, &reuseport_array,
684 BPF_ANY);
685 RET_IF(err < 0, "update_elem(outer_map, 0, reuseport_array)",
686 "err:%d errno:%d\n", err, errno);
687 }
688
689 static void cleanup_per_test(bool no_inner_map)
690 {
691 int i, err, zero = 0;
692
693 memset(expected_results, 0, sizeof(expected_results));
694
695 for (i = 0; i < NR_RESULTS; i++) {
696 err = bpf_map_update_elem(result_map, &i, &zero, BPF_ANY);
697 RET_IF(err, "reset elem in result_map",
698 "i:%u err:%d errno:%d\n", i, err, errno);
699 }
700
701 err = bpf_map_update_elem(linum_map, &zero, &zero, BPF_ANY);
702 RET_IF(err, "reset line number in linum_map", "err:%d errno:%d\n",
703 err, errno);
704
705 for (i = 0; i < REUSEPORT_ARRAY_SIZE; i++)
706 close(sk_fds[i]);
707 close(epfd);
708
709 /* Delete reuseport_array from outer_map? */
710 if (no_inner_map)
711 return;
712
713 err = bpf_map_delete_elem(outer_map, &index_zero);
714 RET_IF(err < 0, "delete_elem(outer_map)",
715 "err:%d errno:%d\n", err, errno);
716 }
717
718 static void cleanup(void)
719 {
720 if (outer_map >= 0) {
721 close(outer_map);
722 outer_map = -1;
723 }
724
725 if (reuseport_array >= 0) {
726 close(reuseport_array);
727 reuseport_array = -1;
728 }
729
730 if (obj) {
731 bpf_object__close(obj);
732 obj = NULL;
733 }
734
735 memset(expected_results, 0, sizeof(expected_results));
736 }
737
738 static const char *maptype_str(enum bpf_map_type type)
739 {
740 switch (type) {
741 case BPF_MAP_TYPE_REUSEPORT_SOCKARRAY:
742 return "reuseport_sockarray";
743 case BPF_MAP_TYPE_SOCKMAP:
744 return "sockmap";
745 case BPF_MAP_TYPE_SOCKHASH:
746 return "sockhash";
747 default:
748 return "unknown";
749 }
750 }
751
752 static const char *family_str(sa_family_t family)
753 {
754 switch (family) {
755 case AF_INET:
756 return "IPv4";
757 case AF_INET6:
758 return "IPv6";
759 default:
760 return "unknown";
761 }
762 }
763
764 static const char *sotype_str(int sotype)
765 {
766 switch (sotype) {
767 case SOCK_STREAM:
768 return "TCP";
769 case SOCK_DGRAM:
770 return "UDP";
771 default:
772 return "unknown";
773 }
774 }
775
776 #define TEST_INIT(fn_, ...) { .fn = fn_, .name = #fn_, __VA_ARGS__ }
777
778 static void test_config(int sotype, sa_family_t family, bool inany)
779 {
780 const struct test {
781 void (*fn)(int sotype, sa_family_t family);
782 const char *name;
783 bool no_inner_map;
784 int need_sotype;
785 } tests[] = {
786 TEST_INIT(test_err_inner_map,
787 .no_inner_map = true),
788 TEST_INIT(test_err_skb_data),
789 TEST_INIT(test_err_sk_select_port),
790 TEST_INIT(test_pass),
791 TEST_INIT(test_syncookie,
792 .need_sotype = SOCK_STREAM),
793 TEST_INIT(test_pass_on_err),
794 TEST_INIT(test_detach_bpf),
795 };
796 char s[MAX_TEST_NAME];
797 const struct test *t;
798
799 for (t = tests; t < tests + ARRAY_SIZE(tests); t++) {
800 if (t->need_sotype && t->need_sotype != sotype)
801 continue; /* test not compatible with socket type */
802
803 snprintf(s, sizeof(s), "%s %s/%s %s %s",
804 maptype_str(inner_map_type),
805 family_str(family), sotype_str(sotype),
806 inany ? "INANY" : "LOOPBACK", t->name);
807
808 if (!test__start_subtest(s))
809 continue;
810
811 setup_per_test(sotype, family, inany, t->no_inner_map);
812 t->fn(sotype, family);
813 cleanup_per_test(t->no_inner_map);
814 }
815 }
816
817 #define BIND_INANY true
818
819 static void test_all(void)
820 {
821 const struct config {
822 int sotype;
823 sa_family_t family;
824 bool inany;
825 } configs[] = {
826 { SOCK_STREAM, AF_INET },
827 { SOCK_STREAM, AF_INET, BIND_INANY },
828 { SOCK_STREAM, AF_INET6 },
829 { SOCK_STREAM, AF_INET6, BIND_INANY },
830 { SOCK_DGRAM, AF_INET },
831 { SOCK_DGRAM, AF_INET6 },
832 };
833 const struct config *c;
834
835 for (c = configs; c < configs + ARRAY_SIZE(configs); c++)
836 test_config(c->sotype, c->family, c->inany);
837 }
838
839 void test_map_type(enum bpf_map_type mt)
840 {
841 if (create_maps(mt))
842 goto out;
843 if (prepare_bpf_obj())
844 goto out;
845
846 test_all();
847 out:
848 cleanup();
849 }
850
851 void serial_test_select_reuseport(void)
852 {
853 saved_tcp_fo = read_int_sysctl(TCP_FO_SYSCTL);
854 if (saved_tcp_fo < 0)
855 goto out;
856 saved_tcp_syncookie = read_int_sysctl(TCP_SYNCOOKIE_SYSCTL);
857 if (saved_tcp_syncookie < 0)
858 goto out;
859
860 if (enable_fastopen())
861 goto out;
862 if (disable_syncookie())
863 goto out;
864
865 test_map_type(BPF_MAP_TYPE_REUSEPORT_SOCKARRAY);
866 test_map_type(BPF_MAP_TYPE_SOCKMAP);
867 test_map_type(BPF_MAP_TYPE_SOCKHASH);
868 out:
869 restore_sysctls();
870 }
871
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