1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2019 Facebook */ 3 4 #include <linux/err.h> 5 #include <netinet/tcp.h> 6 #include <test_progs.h> 7 #include "network_helpers.h" 8 #include "bpf_dctcp.skel.h" 9 #include "bpf_cubic.skel.h" 10 #include "bpf_tcp_nogpl.skel.h" 11 #include "tcp_ca_update.skel.h" 12 #include "bpf_dctcp_release.skel.h" 13 #include "tcp_ca_write_sk_pacing.skel.h" 14 #include "tcp_ca_incompl_cong_ops.skel.h" 15 #include "tcp_ca_unsupp_cong_op.skel.h" 16 17 #ifndef ENOTSUPP 18 #define ENOTSUPP 524 19 #endif 20 21 static const unsigned int total_bytes = 10 * 1024 * 1024; 22 static int expected_stg = 0xeB9F; 23 static int stop, duration; 24 25 static int settcpca(int fd, const char *tcp_ca) 26 { 27 int err; 28 29 err = setsockopt(fd, IPPROTO_TCP, TCP_CONGESTION, tcp_ca, strlen(tcp_ca)); 30 if (CHECK(err == -1, "setsockopt(fd, TCP_CONGESTION)", "errno:%d\n", 31 errno)) 32 return -1; 33 34 return 0; 35 } 36 37 static void *server(void *arg) 38 { 39 int lfd = (int)(long)arg, err = 0, fd; 40 ssize_t nr_sent = 0, bytes = 0; 41 char batch[1500]; 42 43 fd = accept(lfd, NULL, NULL); 44 while (fd == -1) { 45 if (errno == EINTR) 46 continue; 47 err = -errno; 48 goto done; 49 } 50 51 if (settimeo(fd, 0)) { 52 err = -errno; 53 goto done; 54 } 55 56 while (bytes < total_bytes && !READ_ONCE(stop)) { 57 nr_sent = send(fd, &batch, 58 MIN(total_bytes - bytes, sizeof(batch)), 0); 59 if (nr_sent == -1 && errno == EINTR) 60 continue; 61 if (nr_sent == -1) { 62 err = -errno; 63 break; 64 } 65 bytes += nr_sent; 66 } 67 68 CHECK(bytes != total_bytes, "send", "%zd != %u nr_sent:%zd errno:%d\n", 69 bytes, total_bytes, nr_sent, errno); 70 71 done: 72 if (fd >= 0) 73 close(fd); 74 if (err) { 75 WRITE_ONCE(stop, 1); 76 return ERR_PTR(err); 77 } 78 return NULL; 79 } 80 81 static void do_test(const char *tcp_ca, const struct bpf_map *sk_stg_map) 82 { 83 struct sockaddr_in6 sa6 = {}; 84 ssize_t nr_recv = 0, bytes = 0; 85 int lfd = -1, fd = -1; 86 pthread_t srv_thread; 87 socklen_t addrlen = sizeof(sa6); 88 void *thread_ret; 89 char batch[1500]; 90 int err; 91 92 WRITE_ONCE(stop, 0); 93 94 lfd = socket(AF_INET6, SOCK_STREAM, 0); 95 if (CHECK(lfd == -1, "socket", "errno:%d\n", errno)) 96 return; 97 fd = socket(AF_INET6, SOCK_STREAM, 0); 98 if (CHECK(fd == -1, "socket", "errno:%d\n", errno)) { 99 close(lfd); 100 return; 101 } 102 103 if (settcpca(lfd, tcp_ca) || settcpca(fd, tcp_ca) || 104 settimeo(lfd, 0) || settimeo(fd, 0)) 105 goto done; 106 107 /* bind, listen and start server thread to accept */ 108 sa6.sin6_family = AF_INET6; 109 sa6.sin6_addr = in6addr_loopback; 110 err = bind(lfd, (struct sockaddr *)&sa6, addrlen); 111 if (CHECK(err == -1, "bind", "errno:%d\n", errno)) 112 goto done; 113 err = getsockname(lfd, (struct sockaddr *)&sa6, &addrlen); 114 if (CHECK(err == -1, "getsockname", "errno:%d\n", errno)) 115 goto done; 116 err = listen(lfd, 1); 117 if (CHECK(err == -1, "listen", "errno:%d\n", errno)) 118 goto done; 119 120 if (sk_stg_map) { 121 err = bpf_map_update_elem(bpf_map__fd(sk_stg_map), &fd, 122 &expected_stg, BPF_NOEXIST); 123 if (CHECK(err, "bpf_map_update_elem(sk_stg_map)", 124 "err:%d errno:%d\n", err, errno)) 125 goto done; 126 } 127 128 /* connect to server */ 129 err = connect(fd, (struct sockaddr *)&sa6, addrlen); 130 if (CHECK(err == -1, "connect", "errno:%d\n", errno)) 131 goto done; 132 133 if (sk_stg_map) { 134 int tmp_stg; 135 136 err = bpf_map_lookup_elem(bpf_map__fd(sk_stg_map), &fd, 137 &tmp_stg); 138 if (CHECK(!err || errno != ENOENT, 139 "bpf_map_lookup_elem(sk_stg_map)", 140 "err:%d errno:%d\n", err, errno)) 141 goto done; 142 } 143 144 err = pthread_create(&srv_thread, NULL, server, (void *)(long)lfd); 145 if (CHECK(err != 0, "pthread_create", "err:%d errno:%d\n", err, errno)) 146 goto done; 147 148 /* recv total_bytes */ 149 while (bytes < total_bytes && !READ_ONCE(stop)) { 150 nr_recv = recv(fd, &batch, 151 MIN(total_bytes - bytes, sizeof(batch)), 0); 152 if (nr_recv == -1 && errno == EINTR) 153 continue; 154 if (nr_recv == -1) 155 break; 156 bytes += nr_recv; 157 } 158 159 CHECK(bytes != total_bytes, "recv", "%zd != %u nr_recv:%zd errno:%d\n", 160 bytes, total_bytes, nr_recv, errno); 161 162 WRITE_ONCE(stop, 1); 163 pthread_join(srv_thread, &thread_ret); 164 CHECK(IS_ERR(thread_ret), "pthread_join", "thread_ret:%ld", 165 PTR_ERR(thread_ret)); 166 done: 167 close(lfd); 168 close(fd); 169 } 170 171 static void test_cubic(void) 172 { 173 struct bpf_cubic *cubic_skel; 174 struct bpf_link *link; 175 176 cubic_skel = bpf_cubic__open_and_load(); 177 if (CHECK(!cubic_skel, "bpf_cubic__open_and_load", "failed\n")) 178 return; 179 180 link = bpf_map__attach_struct_ops(cubic_skel->maps.cubic); 181 if (!ASSERT_OK_PTR(link, "bpf_map__attach_struct_ops")) { 182 bpf_cubic__destroy(cubic_skel); 183 return; 184 } 185 186 do_test("bpf_cubic", NULL); 187 188 ASSERT_EQ(cubic_skel->bss->bpf_cubic_acked_called, 1, "pkts_acked called"); 189 190 bpf_link__destroy(link); 191 bpf_cubic__destroy(cubic_skel); 192 } 193 194 static void test_dctcp(void) 195 { 196 struct bpf_dctcp *dctcp_skel; 197 struct bpf_link *link; 198 199 dctcp_skel = bpf_dctcp__open_and_load(); 200 if (CHECK(!dctcp_skel, "bpf_dctcp__open_and_load", "failed\n")) 201 return; 202 203 link = bpf_map__attach_struct_ops(dctcp_skel->maps.dctcp); 204 if (!ASSERT_OK_PTR(link, "bpf_map__attach_struct_ops")) { 205 bpf_dctcp__destroy(dctcp_skel); 206 return; 207 } 208 209 do_test("bpf_dctcp", dctcp_skel->maps.sk_stg_map); 210 CHECK(dctcp_skel->bss->stg_result != expected_stg, 211 "Unexpected stg_result", "stg_result (%x) != expected_stg (%x)\n", 212 dctcp_skel->bss->stg_result, expected_stg); 213 214 bpf_link__destroy(link); 215 bpf_dctcp__destroy(dctcp_skel); 216 } 217 218 static char *err_str; 219 static bool found; 220 221 static int libbpf_debug_print(enum libbpf_print_level level, 222 const char *format, va_list args) 223 { 224 const char *prog_name, *log_buf; 225 226 if (level != LIBBPF_WARN || 227 !strstr(format, "-- BEGIN PROG LOAD LOG --")) { 228 vprintf(format, args); 229 return 0; 230 } 231 232 prog_name = va_arg(args, char *); 233 log_buf = va_arg(args, char *); 234 if (!log_buf) 235 goto out; 236 if (err_str && strstr(log_buf, err_str) != NULL) 237 found = true; 238 out: 239 printf(format, prog_name, log_buf); 240 return 0; 241 } 242 243 static void test_invalid_license(void) 244 { 245 libbpf_print_fn_t old_print_fn; 246 struct bpf_tcp_nogpl *skel; 247 248 err_str = "struct ops programs must have a GPL compatible license"; 249 found = false; 250 old_print_fn = libbpf_set_print(libbpf_debug_print); 251 252 skel = bpf_tcp_nogpl__open_and_load(); 253 ASSERT_NULL(skel, "bpf_tcp_nogpl"); 254 ASSERT_EQ(found, true, "expected_err_msg"); 255 256 bpf_tcp_nogpl__destroy(skel); 257 libbpf_set_print(old_print_fn); 258 } 259 260 static void test_dctcp_fallback(void) 261 { 262 int err, lfd = -1, cli_fd = -1, srv_fd = -1; 263 struct network_helper_opts opts = { 264 .cc = "cubic", 265 }; 266 struct bpf_dctcp *dctcp_skel; 267 struct bpf_link *link = NULL; 268 char srv_cc[16]; 269 socklen_t cc_len = sizeof(srv_cc); 270 271 dctcp_skel = bpf_dctcp__open(); 272 if (!ASSERT_OK_PTR(dctcp_skel, "dctcp_skel")) 273 return; 274 strcpy(dctcp_skel->rodata->fallback, "cubic"); 275 if (!ASSERT_OK(bpf_dctcp__load(dctcp_skel), "bpf_dctcp__load")) 276 goto done; 277 278 link = bpf_map__attach_struct_ops(dctcp_skel->maps.dctcp); 279 if (!ASSERT_OK_PTR(link, "dctcp link")) 280 goto done; 281 282 lfd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0); 283 if (!ASSERT_GE(lfd, 0, "lfd") || 284 !ASSERT_OK(settcpca(lfd, "bpf_dctcp"), "lfd=>bpf_dctcp")) 285 goto done; 286 287 cli_fd = connect_to_fd_opts(lfd, &opts); 288 if (!ASSERT_GE(cli_fd, 0, "cli_fd")) 289 goto done; 290 291 srv_fd = accept(lfd, NULL, 0); 292 if (!ASSERT_GE(srv_fd, 0, "srv_fd")) 293 goto done; 294 ASSERT_STREQ(dctcp_skel->bss->cc_res, "cubic", "cc_res"); 295 ASSERT_EQ(dctcp_skel->bss->tcp_cdg_res, -ENOTSUPP, "tcp_cdg_res"); 296 /* All setsockopt(TCP_CONGESTION) in the recurred 297 * bpf_dctcp->init() should fail with -EBUSY. 298 */ 299 ASSERT_EQ(dctcp_skel->bss->ebusy_cnt, 3, "ebusy_cnt"); 300 301 err = getsockopt(srv_fd, SOL_TCP, TCP_CONGESTION, srv_cc, &cc_len); 302 if (!ASSERT_OK(err, "getsockopt(srv_fd, TCP_CONGESTION)")) 303 goto done; 304 ASSERT_STREQ(srv_cc, "cubic", "srv_fd cc"); 305 306 done: 307 bpf_link__destroy(link); 308 bpf_dctcp__destroy(dctcp_skel); 309 if (lfd != -1) 310 close(lfd); 311 if (srv_fd != -1) 312 close(srv_fd); 313 if (cli_fd != -1) 314 close(cli_fd); 315 } 316 317 static void test_rel_setsockopt(void) 318 { 319 struct bpf_dctcp_release *rel_skel; 320 libbpf_print_fn_t old_print_fn; 321 322 err_str = "unknown func bpf_setsockopt"; 323 found = false; 324 325 old_print_fn = libbpf_set_print(libbpf_debug_print); 326 rel_skel = bpf_dctcp_release__open_and_load(); 327 libbpf_set_print(old_print_fn); 328 329 ASSERT_ERR_PTR(rel_skel, "rel_skel"); 330 ASSERT_TRUE(found, "expected_err_msg"); 331 332 bpf_dctcp_release__destroy(rel_skel); 333 } 334 335 static void test_write_sk_pacing(void) 336 { 337 struct tcp_ca_write_sk_pacing *skel; 338 struct bpf_link *link; 339 340 skel = tcp_ca_write_sk_pacing__open_and_load(); 341 if (!ASSERT_OK_PTR(skel, "open_and_load")) 342 return; 343 344 link = bpf_map__attach_struct_ops(skel->maps.write_sk_pacing); 345 ASSERT_OK_PTR(link, "attach_struct_ops"); 346 347 bpf_link__destroy(link); 348 tcp_ca_write_sk_pacing__destroy(skel); 349 } 350 351 static void test_incompl_cong_ops(void) 352 { 353 struct tcp_ca_incompl_cong_ops *skel; 354 struct bpf_link *link; 355 356 skel = tcp_ca_incompl_cong_ops__open_and_load(); 357 if (!ASSERT_OK_PTR(skel, "open_and_load")) 358 return; 359 360 /* That cong_avoid() and cong_control() are missing is only reported at 361 * this point: 362 */ 363 link = bpf_map__attach_struct_ops(skel->maps.incompl_cong_ops); 364 ASSERT_ERR_PTR(link, "attach_struct_ops"); 365 366 bpf_link__destroy(link); 367 tcp_ca_incompl_cong_ops__destroy(skel); 368 } 369 370 static void test_unsupp_cong_op(void) 371 { 372 libbpf_print_fn_t old_print_fn; 373 struct tcp_ca_unsupp_cong_op *skel; 374 375 err_str = "attach to unsupported member get_info"; 376 found = false; 377 old_print_fn = libbpf_set_print(libbpf_debug_print); 378 379 skel = tcp_ca_unsupp_cong_op__open_and_load(); 380 ASSERT_NULL(skel, "open_and_load"); 381 ASSERT_EQ(found, true, "expected_err_msg"); 382 383 tcp_ca_unsupp_cong_op__destroy(skel); 384 libbpf_set_print(old_print_fn); 385 } 386 387 static void test_update_ca(void) 388 { 389 struct tcp_ca_update *skel; 390 struct bpf_link *link; 391 int saved_ca1_cnt; 392 int err; 393 394 skel = tcp_ca_update__open_and_load(); 395 if (!ASSERT_OK_PTR(skel, "open")) 396 return; 397 398 link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); 399 ASSERT_OK_PTR(link, "attach_struct_ops"); 400 401 do_test("tcp_ca_update", NULL); 402 saved_ca1_cnt = skel->bss->ca1_cnt; 403 ASSERT_GT(saved_ca1_cnt, 0, "ca1_ca1_cnt"); 404 405 err = bpf_link__update_map(link, skel->maps.ca_update_2); 406 ASSERT_OK(err, "update_map"); 407 408 do_test("tcp_ca_update", NULL); 409 ASSERT_EQ(skel->bss->ca1_cnt, saved_ca1_cnt, "ca2_ca1_cnt"); 410 ASSERT_GT(skel->bss->ca2_cnt, 0, "ca2_ca2_cnt"); 411 412 bpf_link__destroy(link); 413 tcp_ca_update__destroy(skel); 414 } 415 416 static void test_update_wrong(void) 417 { 418 struct tcp_ca_update *skel; 419 struct bpf_link *link; 420 int saved_ca1_cnt; 421 int err; 422 423 skel = tcp_ca_update__open_and_load(); 424 if (!ASSERT_OK_PTR(skel, "open")) 425 return; 426 427 link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); 428 ASSERT_OK_PTR(link, "attach_struct_ops"); 429 430 do_test("tcp_ca_update", NULL); 431 saved_ca1_cnt = skel->bss->ca1_cnt; 432 ASSERT_GT(saved_ca1_cnt, 0, "ca1_ca1_cnt"); 433 434 err = bpf_link__update_map(link, skel->maps.ca_wrong); 435 ASSERT_ERR(err, "update_map"); 436 437 do_test("tcp_ca_update", NULL); 438 ASSERT_GT(skel->bss->ca1_cnt, saved_ca1_cnt, "ca2_ca1_cnt"); 439 440 bpf_link__destroy(link); 441 tcp_ca_update__destroy(skel); 442 } 443 444 static void test_mixed_links(void) 445 { 446 struct tcp_ca_update *skel; 447 struct bpf_link *link, *link_nl; 448 int err; 449 450 skel = tcp_ca_update__open_and_load(); 451 if (!ASSERT_OK_PTR(skel, "open")) 452 return; 453 454 link_nl = bpf_map__attach_struct_ops(skel->maps.ca_no_link); 455 ASSERT_OK_PTR(link_nl, "attach_struct_ops_nl"); 456 457 link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); 458 ASSERT_OK_PTR(link, "attach_struct_ops"); 459 460 do_test("tcp_ca_update", NULL); 461 ASSERT_GT(skel->bss->ca1_cnt, 0, "ca1_ca1_cnt"); 462 463 err = bpf_link__update_map(link, skel->maps.ca_no_link); 464 ASSERT_ERR(err, "update_map"); 465 466 bpf_link__destroy(link); 467 bpf_link__destroy(link_nl); 468 tcp_ca_update__destroy(skel); 469 } 470 471 static void test_multi_links(void) 472 { 473 struct tcp_ca_update *skel; 474 struct bpf_link *link; 475 476 skel = tcp_ca_update__open_and_load(); 477 if (!ASSERT_OK_PTR(skel, "open")) 478 return; 479 480 link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); 481 ASSERT_OK_PTR(link, "attach_struct_ops_1st"); 482 bpf_link__destroy(link); 483 484 /* A map should be able to be used to create links multiple 485 * times. 486 */ 487 link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); 488 ASSERT_OK_PTR(link, "attach_struct_ops_2nd"); 489 bpf_link__destroy(link); 490 491 tcp_ca_update__destroy(skel); 492 } 493 494 static void test_link_replace(void) 495 { 496 DECLARE_LIBBPF_OPTS(bpf_link_update_opts, opts); 497 struct tcp_ca_update *skel; 498 struct bpf_link *link; 499 int err; 500 501 skel = tcp_ca_update__open_and_load(); 502 if (!ASSERT_OK_PTR(skel, "open")) 503 return; 504 505 link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); 506 ASSERT_OK_PTR(link, "attach_struct_ops_1st"); 507 bpf_link__destroy(link); 508 509 link = bpf_map__attach_struct_ops(skel->maps.ca_update_2); 510 ASSERT_OK_PTR(link, "attach_struct_ops_2nd"); 511 512 /* BPF_F_REPLACE with a wrong old map Fd. It should fail! 513 * 514 * With BPF_F_REPLACE, the link should be updated only if the 515 * old map fd given here matches the map backing the link. 516 */ 517 opts.old_map_fd = bpf_map__fd(skel->maps.ca_update_1); 518 opts.flags = BPF_F_REPLACE; 519 err = bpf_link_update(bpf_link__fd(link), 520 bpf_map__fd(skel->maps.ca_update_1), 521 &opts); 522 ASSERT_ERR(err, "bpf_link_update_fail"); 523 524 /* BPF_F_REPLACE with a correct old map Fd. It should success! */ 525 opts.old_map_fd = bpf_map__fd(skel->maps.ca_update_2); 526 err = bpf_link_update(bpf_link__fd(link), 527 bpf_map__fd(skel->maps.ca_update_1), 528 &opts); 529 ASSERT_OK(err, "bpf_link_update_success"); 530 531 bpf_link__destroy(link); 532 533 tcp_ca_update__destroy(skel); 534 } 535 536 void test_bpf_tcp_ca(void) 537 { 538 if (test__start_subtest("dctcp")) 539 test_dctcp(); 540 if (test__start_subtest("cubic")) 541 test_cubic(); 542 if (test__start_subtest("invalid_license")) 543 test_invalid_license(); 544 if (test__start_subtest("dctcp_fallback")) 545 test_dctcp_fallback(); 546 if (test__start_subtest("rel_setsockopt")) 547 test_rel_setsockopt(); 548 if (test__start_subtest("write_sk_pacing")) 549 test_write_sk_pacing(); 550 if (test__start_subtest("incompl_cong_ops")) 551 test_incompl_cong_ops(); 552 if (test__start_subtest("unsupp_cong_op")) 553 test_unsupp_cong_op(); 554 if (test__start_subtest("update_ca")) 555 test_update_ca(); 556 if (test__start_subtest("update_wrong")) 557 test_update_wrong(); 558 if (test__start_subtest("mixed_links")) 559 test_mixed_links(); 560 if (test__start_subtest("multi_links")) 561 test_multi_links(); 562 if (test__start_subtest("link_replace")) 563 test_link_replace(); 564 } 565