1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* Copyright (C) 2019 Facebook */ 3 4 #ifndef _GNU_SOURCE 5 #define _GNU_SOURCE 6 #endif 7 #include <ctype.h> 8 #include <errno.h> 9 #include <fcntl.h> 10 #include <linux/err.h> 11 #include <stdbool.h> 12 #include <stdio.h> 13 #include <string.h> 14 #include <unistd.h> 15 #include <bpf/bpf.h> 16 #include <bpf/libbpf.h> 17 #include <sys/types.h> 18 #include <sys/stat.h> 19 #include <sys/mman.h> 20 #include <bpf/btf.h> 21 22 #include "json_writer.h" 23 #include "main.h" 24 25 #define MAX_OBJ_NAME_LEN 64 26 27 static void sanitize_identifier(char *name) 28 { 29 int i; 30 31 for (i = 0; name[i]; i++) 32 if (!isalnum(name[i]) && name[i] != '_') 33 name[i] = '_'; 34 } 35 36 static bool str_has_prefix(const char *str, const char *prefix) 37 { 38 return strncmp(str, prefix, strlen(prefix)) == 0; 39 } 40 41 static bool str_has_suffix(const char *str, const char *suffix) 42 { 43 size_t i, n1 = strlen(str), n2 = strlen(suffix); 44 45 if (n1 < n2) 46 return false; 47 48 for (i = 0; i < n2; i++) { 49 if (str[n1 - i - 1] != suffix[n2 - i - 1]) 50 return false; 51 } 52 53 return true; 54 } 55 56 static void get_obj_name(char *name, const char *file) 57 { 58 /* Using basename() GNU version which doesn't modify arg. */ 59 strncpy(name, basename(file), MAX_OBJ_NAME_LEN - 1); 60 name[MAX_OBJ_NAME_LEN - 1] = '\0'; 61 if (str_has_suffix(name, ".o")) 62 name[strlen(name) - 2] = '\0'; 63 sanitize_identifier(name); 64 } 65 66 static void get_header_guard(char *guard, const char *obj_name) 67 { 68 int i; 69 70 sprintf(guard, "__%s_SKEL_H__", obj_name); 71 for (i = 0; guard[i]; i++) 72 guard[i] = toupper(guard[i]); 73 } 74 75 static bool get_map_ident(const struct bpf_map *map, char *buf, size_t buf_sz) 76 { 77 static const char *sfxs[] = { ".data", ".rodata", ".bss", ".kconfig" }; 78 const char *name = bpf_map__name(map); 79 int i, n; 80 81 if (!bpf_map__is_internal(map)) { 82 snprintf(buf, buf_sz, "%s", name); 83 return true; 84 } 85 86 for (i = 0, n = ARRAY_SIZE(sfxs); i < n; i++) { 87 const char *sfx = sfxs[i], *p; 88 89 p = strstr(name, sfx); 90 if (p) { 91 snprintf(buf, buf_sz, "%s", p + 1); 92 sanitize_identifier(buf); 93 return true; 94 } 95 } 96 97 return false; 98 } 99 100 static bool get_datasec_ident(const char *sec_name, char *buf, size_t buf_sz) 101 { 102 static const char *pfxs[] = { ".data", ".rodata", ".bss", ".kconfig" }; 103 int i, n; 104 105 for (i = 0, n = ARRAY_SIZE(pfxs); i < n; i++) { 106 const char *pfx = pfxs[i]; 107 108 if (str_has_prefix(sec_name, pfx)) { 109 snprintf(buf, buf_sz, "%s", sec_name + 1); 110 sanitize_identifier(buf); 111 return true; 112 } 113 } 114 115 return false; 116 } 117 118 static void codegen_btf_dump_printf(void *ctx, const char *fmt, va_list args) 119 { 120 vprintf(fmt, args); 121 } 122 123 static int codegen_datasec_def(struct bpf_object *obj, 124 struct btf *btf, 125 struct btf_dump *d, 126 const struct btf_type *sec, 127 const char *obj_name) 128 { 129 const char *sec_name = btf__name_by_offset(btf, sec->name_off); 130 const struct btf_var_secinfo *sec_var = btf_var_secinfos(sec); 131 int i, err, off = 0, pad_cnt = 0, vlen = btf_vlen(sec); 132 char var_ident[256], sec_ident[256]; 133 bool strip_mods = false; 134 135 if (!get_datasec_ident(sec_name, sec_ident, sizeof(sec_ident))) 136 return 0; 137 138 if (strcmp(sec_name, ".kconfig") != 0) 139 strip_mods = true; 140 141 printf(" struct %s__%s {\n", obj_name, sec_ident); 142 for (i = 0; i < vlen; i++, sec_var++) { 143 const struct btf_type *var = btf__type_by_id(btf, sec_var->type); 144 const char *var_name = btf__name_by_offset(btf, var->name_off); 145 DECLARE_LIBBPF_OPTS(btf_dump_emit_type_decl_opts, opts, 146 .field_name = var_ident, 147 .indent_level = 2, 148 .strip_mods = strip_mods, 149 ); 150 int need_off = sec_var->offset, align_off, align; 151 __u32 var_type_id = var->type; 152 153 /* static variables are not exposed through BPF skeleton */ 154 if (btf_var(var)->linkage == BTF_VAR_STATIC) 155 continue; 156 157 if (off > need_off) { 158 p_err("Something is wrong for %s's variable #%d: need offset %d, already at %d.\n", 159 sec_name, i, need_off, off); 160 return -EINVAL; 161 } 162 163 align = btf__align_of(btf, var->type); 164 if (align <= 0) { 165 p_err("Failed to determine alignment of variable '%s': %d", 166 var_name, align); 167 return -EINVAL; 168 } 169 /* Assume 32-bit architectures when generating data section 170 * struct memory layout. Given bpftool can't know which target 171 * host architecture it's emitting skeleton for, we need to be 172 * conservative and assume 32-bit one to ensure enough padding 173 * bytes are generated for pointer and long types. This will 174 * still work correctly for 64-bit architectures, because in 175 * the worst case we'll generate unnecessary padding field, 176 * which on 64-bit architectures is not strictly necessary and 177 * would be handled by natural 8-byte alignment. But it still 178 * will be a correct memory layout, based on recorded offsets 179 * in BTF. 180 */ 181 if (align > 4) 182 align = 4; 183 184 align_off = (off + align - 1) / align * align; 185 if (align_off != need_off) { 186 printf("\t\tchar __pad%d[%d];\n", 187 pad_cnt, need_off - off); 188 pad_cnt++; 189 } 190 191 /* sanitize variable name, e.g., for static vars inside 192 * a function, it's name is '<function name>.<variable name>', 193 * which we'll turn into a '<function name>_<variable name>' 194 */ 195 var_ident[0] = '\0'; 196 strncat(var_ident, var_name, sizeof(var_ident) - 1); 197 sanitize_identifier(var_ident); 198 199 printf("\t\t"); 200 err = btf_dump__emit_type_decl(d, var_type_id, &opts); 201 if (err) 202 return err; 203 printf(";\n"); 204 205 off = sec_var->offset + sec_var->size; 206 } 207 printf(" } *%s;\n", sec_ident); 208 return 0; 209 } 210 211 static int codegen_datasecs(struct bpf_object *obj, const char *obj_name) 212 { 213 struct btf *btf = bpf_object__btf(obj); 214 int n = btf__type_cnt(btf); 215 struct btf_dump *d; 216 struct bpf_map *map; 217 const struct btf_type *sec; 218 char sec_ident[256], map_ident[256]; 219 int i, err = 0; 220 221 d = btf_dump__new(btf, NULL, NULL, codegen_btf_dump_printf); 222 if (IS_ERR(d)) 223 return PTR_ERR(d); 224 225 bpf_object__for_each_map(map, obj) { 226 /* only generate definitions for memory-mapped internal maps */ 227 if (!bpf_map__is_internal(map)) 228 continue; 229 if (!(bpf_map__def(map)->map_flags & BPF_F_MMAPABLE)) 230 continue; 231 232 if (!get_map_ident(map, map_ident, sizeof(map_ident))) 233 continue; 234 235 sec = NULL; 236 for (i = 1; i < n; i++) { 237 const struct btf_type *t = btf__type_by_id(btf, i); 238 const char *name; 239 240 if (!btf_is_datasec(t)) 241 continue; 242 243 name = btf__str_by_offset(btf, t->name_off); 244 if (!get_datasec_ident(name, sec_ident, sizeof(sec_ident))) 245 continue; 246 247 if (strcmp(sec_ident, map_ident) == 0) { 248 sec = t; 249 break; 250 } 251 } 252 253 /* In some cases (e.g., sections like .rodata.cst16 containing 254 * compiler allocated string constants only) there will be 255 * special internal maps with no corresponding DATASEC BTF 256 * type. In such case, generate empty structs for each such 257 * map. It will still be memory-mapped and its contents 258 * accessible from user-space through BPF skeleton. 259 */ 260 if (!sec) { 261 printf(" struct %s__%s {\n", obj_name, map_ident); 262 printf(" } *%s;\n", map_ident); 263 } else { 264 err = codegen_datasec_def(obj, btf, d, sec, obj_name); 265 if (err) 266 goto out; 267 } 268 } 269 270 271 out: 272 btf_dump__free(d); 273 return err; 274 } 275 276 static void codegen(const char *template, ...) 277 { 278 const char *src, *end; 279 int skip_tabs = 0, n; 280 char *s, *dst; 281 va_list args; 282 char c; 283 284 n = strlen(template); 285 s = malloc(n + 1); 286 if (!s) 287 exit(-1); 288 src = template; 289 dst = s; 290 291 /* find out "baseline" indentation to skip */ 292 while ((c = *src++)) { 293 if (c == '\t') { 294 skip_tabs++; 295 } else if (c == '\n') { 296 break; 297 } else { 298 p_err("unrecognized character at pos %td in template '%s': '%c'", 299 src - template - 1, template, c); 300 free(s); 301 exit(-1); 302 } 303 } 304 305 while (*src) { 306 /* skip baseline indentation tabs */ 307 for (n = skip_tabs; n > 0; n--, src++) { 308 if (*src != '\t') { 309 p_err("not enough tabs at pos %td in template '%s'", 310 src - template - 1, template); 311 free(s); 312 exit(-1); 313 } 314 } 315 /* trim trailing whitespace */ 316 end = strchrnul(src, '\n'); 317 for (n = end - src; n > 0 && isspace(src[n - 1]); n--) 318 ; 319 memcpy(dst, src, n); 320 dst += n; 321 if (*end) 322 *dst++ = '\n'; 323 src = *end ? end + 1 : end; 324 } 325 *dst++ = '\0'; 326 327 /* print out using adjusted template */ 328 va_start(args, template); 329 n = vprintf(s, args); 330 va_end(args); 331 332 free(s); 333 } 334 335 static void print_hex(const char *data, int data_sz) 336 { 337 int i, len; 338 339 for (i = 0, len = 0; i < data_sz; i++) { 340 int w = data[i] ? 4 : 2; 341 342 len += w; 343 if (len > 78) { 344 printf("\\\n"); 345 len = w; 346 } 347 if (!data[i]) 348 printf("\\0"); 349 else 350 printf("\\x%02x", (unsigned char)data[i]); 351 } 352 } 353 354 static size_t bpf_map_mmap_sz(const struct bpf_map *map) 355 { 356 long page_sz = sysconf(_SC_PAGE_SIZE); 357 size_t map_sz; 358 359 map_sz = (size_t)roundup(bpf_map__value_size(map), 8) * bpf_map__max_entries(map); 360 map_sz = roundup(map_sz, page_sz); 361 return map_sz; 362 } 363 364 static void codegen_attach_detach(struct bpf_object *obj, const char *obj_name) 365 { 366 struct bpf_program *prog; 367 368 bpf_object__for_each_program(prog, obj) { 369 const char *tp_name; 370 371 codegen("\ 372 \n\ 373 \n\ 374 static inline int \n\ 375 %1$s__%2$s__attach(struct %1$s *skel) \n\ 376 { \n\ 377 int prog_fd = skel->progs.%2$s.prog_fd; \n\ 378 ", obj_name, bpf_program__name(prog)); 379 380 switch (bpf_program__get_type(prog)) { 381 case BPF_PROG_TYPE_RAW_TRACEPOINT: 382 tp_name = strchr(bpf_program__section_name(prog), '/') + 1; 383 printf("\tint fd = bpf_raw_tracepoint_open(\"%s\", prog_fd);\n", tp_name); 384 break; 385 case BPF_PROG_TYPE_TRACING: 386 printf("\tint fd = bpf_raw_tracepoint_open(NULL, prog_fd);\n"); 387 break; 388 default: 389 printf("\tint fd = ((void)prog_fd, 0); /* auto-attach not supported */\n"); 390 break; 391 } 392 codegen("\ 393 \n\ 394 \n\ 395 if (fd > 0) \n\ 396 skel->links.%1$s_fd = fd; \n\ 397 return fd; \n\ 398 } \n\ 399 ", bpf_program__name(prog)); 400 } 401 402 codegen("\ 403 \n\ 404 \n\ 405 static inline int \n\ 406 %1$s__attach(struct %1$s *skel) \n\ 407 { \n\ 408 int ret = 0; \n\ 409 \n\ 410 ", obj_name); 411 412 bpf_object__for_each_program(prog, obj) { 413 codegen("\ 414 \n\ 415 ret = ret < 0 ? ret : %1$s__%2$s__attach(skel); \n\ 416 ", obj_name, bpf_program__name(prog)); 417 } 418 419 codegen("\ 420 \n\ 421 return ret < 0 ? ret : 0; \n\ 422 } \n\ 423 \n\ 424 static inline void \n\ 425 %1$s__detach(struct %1$s *skel) \n\ 426 { \n\ 427 ", obj_name); 428 429 bpf_object__for_each_program(prog, obj) { 430 codegen("\ 431 \n\ 432 skel_closenz(skel->links.%1$s_fd); \n\ 433 ", bpf_program__name(prog)); 434 } 435 436 codegen("\ 437 \n\ 438 } \n\ 439 "); 440 } 441 442 static void codegen_destroy(struct bpf_object *obj, const char *obj_name) 443 { 444 struct bpf_program *prog; 445 struct bpf_map *map; 446 char ident[256]; 447 448 codegen("\ 449 \n\ 450 static void \n\ 451 %1$s__destroy(struct %1$s *skel) \n\ 452 { \n\ 453 if (!skel) \n\ 454 return; \n\ 455 %1$s__detach(skel); \n\ 456 ", 457 obj_name); 458 459 bpf_object__for_each_program(prog, obj) { 460 codegen("\ 461 \n\ 462 skel_closenz(skel->progs.%1$s.prog_fd); \n\ 463 ", bpf_program__name(prog)); 464 } 465 466 bpf_object__for_each_map(map, obj) { 467 if (!get_map_ident(map, ident, sizeof(ident))) 468 continue; 469 if (bpf_map__is_internal(map) && 470 (bpf_map__def(map)->map_flags & BPF_F_MMAPABLE)) 471 printf("\tmunmap(skel->%1$s, %2$zd);\n", 472 ident, bpf_map_mmap_sz(map)); 473 codegen("\ 474 \n\ 475 skel_closenz(skel->maps.%1$s.map_fd); \n\ 476 ", ident); 477 } 478 codegen("\ 479 \n\ 480 free(skel); \n\ 481 } \n\ 482 ", 483 obj_name); 484 } 485 486 static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *header_guard) 487 { 488 struct bpf_object_load_attr load_attr = {}; 489 DECLARE_LIBBPF_OPTS(gen_loader_opts, opts); 490 struct bpf_map *map; 491 char ident[256]; 492 int err = 0; 493 494 err = bpf_object__gen_loader(obj, &opts); 495 if (err) 496 return err; 497 498 load_attr.obj = obj; 499 if (verifier_logs) 500 /* log_level1 + log_level2 + stats, but not stable UAPI */ 501 load_attr.log_level = 1 + 2 + 4; 502 503 err = bpf_object__load_xattr(&load_attr); 504 if (err) { 505 p_err("failed to load object file"); 506 goto out; 507 } 508 /* If there was no error during load then gen_loader_opts 509 * are populated with the loader program. 510 */ 511 512 /* finish generating 'struct skel' */ 513 codegen("\ 514 \n\ 515 }; \n\ 516 ", obj_name); 517 518 519 codegen_attach_detach(obj, obj_name); 520 521 codegen_destroy(obj, obj_name); 522 523 codegen("\ 524 \n\ 525 static inline struct %1$s * \n\ 526 %1$s__open(void) \n\ 527 { \n\ 528 struct %1$s *skel; \n\ 529 \n\ 530 skel = calloc(sizeof(*skel), 1); \n\ 531 if (!skel) \n\ 532 goto cleanup; \n\ 533 skel->ctx.sz = (void *)&skel->links - (void *)skel; \n\ 534 ", 535 obj_name, opts.data_sz); 536 bpf_object__for_each_map(map, obj) { 537 const void *mmap_data = NULL; 538 size_t mmap_size = 0; 539 540 if (!get_map_ident(map, ident, sizeof(ident))) 541 continue; 542 543 if (!bpf_map__is_internal(map) || 544 !(bpf_map__def(map)->map_flags & BPF_F_MMAPABLE)) 545 continue; 546 547 codegen("\ 548 \n\ 549 skel->%1$s = \n\ 550 mmap(NULL, %2$zd, PROT_READ | PROT_WRITE,\n\ 551 MAP_SHARED | MAP_ANONYMOUS, -1, 0); \n\ 552 if (skel->%1$s == (void *) -1) \n\ 553 goto cleanup; \n\ 554 memcpy(skel->%1$s, (void *)\"\\ \n\ 555 ", ident, bpf_map_mmap_sz(map)); 556 mmap_data = bpf_map__initial_value(map, &mmap_size); 557 print_hex(mmap_data, mmap_size); 558 printf("\", %2$zd);\n" 559 "\tskel->maps.%1$s.initial_value = (__u64)(long)skel->%1$s;\n", 560 ident, mmap_size); 561 } 562 codegen("\ 563 \n\ 564 return skel; \n\ 565 cleanup: \n\ 566 %1$s__destroy(skel); \n\ 567 return NULL; \n\ 568 } \n\ 569 \n\ 570 static inline int \n\ 571 %1$s__load(struct %1$s *skel) \n\ 572 { \n\ 573 struct bpf_load_and_run_opts opts = {}; \n\ 574 int err; \n\ 575 \n\ 576 opts.ctx = (struct bpf_loader_ctx *)skel; \n\ 577 opts.data_sz = %2$d; \n\ 578 opts.data = (void *)\"\\ \n\ 579 ", 580 obj_name, opts.data_sz); 581 print_hex(opts.data, opts.data_sz); 582 codegen("\ 583 \n\ 584 \"; \n\ 585 "); 586 587 codegen("\ 588 \n\ 589 opts.insns_sz = %d; \n\ 590 opts.insns = (void *)\"\\ \n\ 591 ", 592 opts.insns_sz); 593 print_hex(opts.insns, opts.insns_sz); 594 codegen("\ 595 \n\ 596 \"; \n\ 597 err = bpf_load_and_run(&opts); \n\ 598 if (err < 0) \n\ 599 return err; \n\ 600 ", obj_name); 601 bpf_object__for_each_map(map, obj) { 602 const char *mmap_flags; 603 604 if (!get_map_ident(map, ident, sizeof(ident))) 605 continue; 606 607 if (!bpf_map__is_internal(map) || 608 !(bpf_map__def(map)->map_flags & BPF_F_MMAPABLE)) 609 continue; 610 611 if (bpf_map__def(map)->map_flags & BPF_F_RDONLY_PROG) 612 mmap_flags = "PROT_READ"; 613 else 614 mmap_flags = "PROT_READ | PROT_WRITE"; 615 616 printf("\tskel->%1$s =\n" 617 "\t\tmmap(skel->%1$s, %2$zd, %3$s, MAP_SHARED | MAP_FIXED,\n" 618 "\t\t\tskel->maps.%1$s.map_fd, 0);\n", 619 ident, bpf_map_mmap_sz(map), mmap_flags); 620 } 621 codegen("\ 622 \n\ 623 return 0; \n\ 624 } \n\ 625 \n\ 626 static inline struct %1$s * \n\ 627 %1$s__open_and_load(void) \n\ 628 { \n\ 629 struct %1$s *skel; \n\ 630 \n\ 631 skel = %1$s__open(); \n\ 632 if (!skel) \n\ 633 return NULL; \n\ 634 if (%1$s__load(skel)) { \n\ 635 %1$s__destroy(skel); \n\ 636 return NULL; \n\ 637 } \n\ 638 return skel; \n\ 639 } \n\ 640 ", obj_name); 641 642 codegen("\ 643 \n\ 644 \n\ 645 #endif /* %s */ \n\ 646 ", 647 header_guard); 648 err = 0; 649 out: 650 return err; 651 } 652 653 static int do_skeleton(int argc, char **argv) 654 { 655 char header_guard[MAX_OBJ_NAME_LEN + sizeof("__SKEL_H__")]; 656 size_t i, map_cnt = 0, prog_cnt = 0, file_sz, mmap_sz; 657 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts); 658 char obj_name[MAX_OBJ_NAME_LEN] = "", *obj_data; 659 struct bpf_object *obj = NULL; 660 const char *file; 661 char ident[256]; 662 struct bpf_program *prog; 663 int fd, err = -1; 664 struct bpf_map *map; 665 struct btf *btf; 666 struct stat st; 667 668 if (!REQ_ARGS(1)) { 669 usage(); 670 return -1; 671 } 672 file = GET_ARG(); 673 674 while (argc) { 675 if (!REQ_ARGS(2)) 676 return -1; 677 678 if (is_prefix(*argv, "name")) { 679 NEXT_ARG(); 680 681 if (obj_name[0] != '\0') { 682 p_err("object name already specified"); 683 return -1; 684 } 685 686 strncpy(obj_name, *argv, MAX_OBJ_NAME_LEN - 1); 687 obj_name[MAX_OBJ_NAME_LEN - 1] = '\0'; 688 } else { 689 p_err("unknown arg %s", *argv); 690 return -1; 691 } 692 693 NEXT_ARG(); 694 } 695 696 if (argc) { 697 p_err("extra unknown arguments"); 698 return -1; 699 } 700 701 if (stat(file, &st)) { 702 p_err("failed to stat() %s: %s", file, strerror(errno)); 703 return -1; 704 } 705 file_sz = st.st_size; 706 mmap_sz = roundup(file_sz, sysconf(_SC_PAGE_SIZE)); 707 fd = open(file, O_RDONLY); 708 if (fd < 0) { 709 p_err("failed to open() %s: %s", file, strerror(errno)); 710 return -1; 711 } 712 obj_data = mmap(NULL, mmap_sz, PROT_READ, MAP_PRIVATE, fd, 0); 713 if (obj_data == MAP_FAILED) { 714 obj_data = NULL; 715 p_err("failed to mmap() %s: %s", file, strerror(errno)); 716 goto out; 717 } 718 if (obj_name[0] == '\0') 719 get_obj_name(obj_name, file); 720 opts.object_name = obj_name; 721 obj = bpf_object__open_mem(obj_data, file_sz, &opts); 722 if (IS_ERR(obj)) { 723 char err_buf[256]; 724 725 libbpf_strerror(PTR_ERR(obj), err_buf, sizeof(err_buf)); 726 p_err("failed to open BPF object file: %s", err_buf); 727 obj = NULL; 728 goto out; 729 } 730 731 bpf_object__for_each_map(map, obj) { 732 if (!get_map_ident(map, ident, sizeof(ident))) { 733 p_err("ignoring unrecognized internal map '%s'...", 734 bpf_map__name(map)); 735 continue; 736 } 737 map_cnt++; 738 } 739 bpf_object__for_each_program(prog, obj) { 740 prog_cnt++; 741 } 742 743 get_header_guard(header_guard, obj_name); 744 if (use_loader) { 745 codegen("\ 746 \n\ 747 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ \n\ 748 /* THIS FILE IS AUTOGENERATED! */ \n\ 749 #ifndef %2$s \n\ 750 #define %2$s \n\ 751 \n\ 752 #include <stdlib.h> \n\ 753 #include <bpf/bpf.h> \n\ 754 #include <bpf/skel_internal.h> \n\ 755 \n\ 756 struct %1$s { \n\ 757 struct bpf_loader_ctx ctx; \n\ 758 ", 759 obj_name, header_guard 760 ); 761 } else { 762 codegen("\ 763 \n\ 764 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ \n\ 765 \n\ 766 /* THIS FILE IS AUTOGENERATED! */ \n\ 767 #ifndef %2$s \n\ 768 #define %2$s \n\ 769 \n\ 770 #include <errno.h> \n\ 771 #include <stdlib.h> \n\ 772 #include <bpf/libbpf.h> \n\ 773 \n\ 774 struct %1$s { \n\ 775 struct bpf_object_skeleton *skeleton; \n\ 776 struct bpf_object *obj; \n\ 777 ", 778 obj_name, header_guard 779 ); 780 } 781 782 if (map_cnt) { 783 printf("\tstruct {\n"); 784 bpf_object__for_each_map(map, obj) { 785 if (!get_map_ident(map, ident, sizeof(ident))) 786 continue; 787 if (use_loader) 788 printf("\t\tstruct bpf_map_desc %s;\n", ident); 789 else 790 printf("\t\tstruct bpf_map *%s;\n", ident); 791 } 792 printf("\t} maps;\n"); 793 } 794 795 if (prog_cnt) { 796 printf("\tstruct {\n"); 797 bpf_object__for_each_program(prog, obj) { 798 if (use_loader) 799 printf("\t\tstruct bpf_prog_desc %s;\n", 800 bpf_program__name(prog)); 801 else 802 printf("\t\tstruct bpf_program *%s;\n", 803 bpf_program__name(prog)); 804 } 805 printf("\t} progs;\n"); 806 printf("\tstruct {\n"); 807 bpf_object__for_each_program(prog, obj) { 808 if (use_loader) 809 printf("\t\tint %s_fd;\n", 810 bpf_program__name(prog)); 811 else 812 printf("\t\tstruct bpf_link *%s;\n", 813 bpf_program__name(prog)); 814 } 815 printf("\t} links;\n"); 816 } 817 818 btf = bpf_object__btf(obj); 819 if (btf) { 820 err = codegen_datasecs(obj, obj_name); 821 if (err) 822 goto out; 823 } 824 if (use_loader) { 825 err = gen_trace(obj, obj_name, header_guard); 826 goto out; 827 } 828 829 codegen("\ 830 \n\ 831 }; \n\ 832 \n\ 833 static void \n\ 834 %1$s__destroy(struct %1$s *obj) \n\ 835 { \n\ 836 if (!obj) \n\ 837 return; \n\ 838 if (obj->skeleton) \n\ 839 bpf_object__destroy_skeleton(obj->skeleton);\n\ 840 free(obj); \n\ 841 } \n\ 842 \n\ 843 static inline int \n\ 844 %1$s__create_skeleton(struct %1$s *obj); \n\ 845 \n\ 846 static inline struct %1$s * \n\ 847 %1$s__open_opts(const struct bpf_object_open_opts *opts) \n\ 848 { \n\ 849 struct %1$s *obj; \n\ 850 int err; \n\ 851 \n\ 852 obj = (struct %1$s *)calloc(1, sizeof(*obj)); \n\ 853 if (!obj) { \n\ 854 errno = ENOMEM; \n\ 855 return NULL; \n\ 856 } \n\ 857 \n\ 858 err = %1$s__create_skeleton(obj); \n\ 859 if (err) \n\ 860 goto err_out; \n\ 861 \n\ 862 err = bpf_object__open_skeleton(obj->skeleton, opts);\n\ 863 if (err) \n\ 864 goto err_out; \n\ 865 \n\ 866 return obj; \n\ 867 err_out: \n\ 868 %1$s__destroy(obj); \n\ 869 errno = -err; \n\ 870 return NULL; \n\ 871 } \n\ 872 \n\ 873 static inline struct %1$s * \n\ 874 %1$s__open(void) \n\ 875 { \n\ 876 return %1$s__open_opts(NULL); \n\ 877 } \n\ 878 \n\ 879 static inline int \n\ 880 %1$s__load(struct %1$s *obj) \n\ 881 { \n\ 882 return bpf_object__load_skeleton(obj->skeleton); \n\ 883 } \n\ 884 \n\ 885 static inline struct %1$s * \n\ 886 %1$s__open_and_load(void) \n\ 887 { \n\ 888 struct %1$s *obj; \n\ 889 int err; \n\ 890 \n\ 891 obj = %1$s__open(); \n\ 892 if (!obj) \n\ 893 return NULL; \n\ 894 err = %1$s__load(obj); \n\ 895 if (err) { \n\ 896 %1$s__destroy(obj); \n\ 897 errno = -err; \n\ 898 return NULL; \n\ 899 } \n\ 900 return obj; \n\ 901 } \n\ 902 \n\ 903 static inline int \n\ 904 %1$s__attach(struct %1$s *obj) \n\ 905 { \n\ 906 return bpf_object__attach_skeleton(obj->skeleton); \n\ 907 } \n\ 908 \n\ 909 static inline void \n\ 910 %1$s__detach(struct %1$s *obj) \n\ 911 { \n\ 912 return bpf_object__detach_skeleton(obj->skeleton); \n\ 913 } \n\ 914 ", 915 obj_name 916 ); 917 918 codegen("\ 919 \n\ 920 \n\ 921 static inline const void *%1$s__elf_bytes(size_t *sz); \n\ 922 \n\ 923 static inline int \n\ 924 %1$s__create_skeleton(struct %1$s *obj) \n\ 925 { \n\ 926 struct bpf_object_skeleton *s; \n\ 927 \n\ 928 s = (struct bpf_object_skeleton *)calloc(1, sizeof(*s));\n\ 929 if (!s) \n\ 930 goto err; \n\ 931 obj->skeleton = s; \n\ 932 \n\ 933 s->sz = sizeof(*s); \n\ 934 s->name = \"%1$s\"; \n\ 935 s->obj = &obj->obj; \n\ 936 ", 937 obj_name 938 ); 939 if (map_cnt) { 940 codegen("\ 941 \n\ 942 \n\ 943 /* maps */ \n\ 944 s->map_cnt = %zu; \n\ 945 s->map_skel_sz = sizeof(*s->maps); \n\ 946 s->maps = (struct bpf_map_skeleton *)calloc(s->map_cnt, s->map_skel_sz);\n\ 947 if (!s->maps) \n\ 948 goto err; \n\ 949 ", 950 map_cnt 951 ); 952 i = 0; 953 bpf_object__for_each_map(map, obj) { 954 if (!get_map_ident(map, ident, sizeof(ident))) 955 continue; 956 957 codegen("\ 958 \n\ 959 \n\ 960 s->maps[%zu].name = \"%s\"; \n\ 961 s->maps[%zu].map = &obj->maps.%s; \n\ 962 ", 963 i, bpf_map__name(map), i, ident); 964 /* memory-mapped internal maps */ 965 if (bpf_map__is_internal(map) && 966 (bpf_map__def(map)->map_flags & BPF_F_MMAPABLE)) { 967 printf("\ts->maps[%zu].mmaped = (void **)&obj->%s;\n", 968 i, ident); 969 } 970 i++; 971 } 972 } 973 if (prog_cnt) { 974 codegen("\ 975 \n\ 976 \n\ 977 /* programs */ \n\ 978 s->prog_cnt = %zu; \n\ 979 s->prog_skel_sz = sizeof(*s->progs); \n\ 980 s->progs = (struct bpf_prog_skeleton *)calloc(s->prog_cnt, s->prog_skel_sz);\n\ 981 if (!s->progs) \n\ 982 goto err; \n\ 983 ", 984 prog_cnt 985 ); 986 i = 0; 987 bpf_object__for_each_program(prog, obj) { 988 codegen("\ 989 \n\ 990 \n\ 991 s->progs[%1$zu].name = \"%2$s\"; \n\ 992 s->progs[%1$zu].prog = &obj->progs.%2$s;\n\ 993 s->progs[%1$zu].link = &obj->links.%2$s;\n\ 994 ", 995 i, bpf_program__name(prog)); 996 i++; 997 } 998 } 999 codegen("\ 1000 \n\ 1001 \n\ 1002 s->data = (void *)%2$s__elf_bytes(&s->data_sz); \n\ 1003 \n\ 1004 return 0; \n\ 1005 err: \n\ 1006 bpf_object__destroy_skeleton(s); \n\ 1007 return -ENOMEM; \n\ 1008 } \n\ 1009 \n\ 1010 static inline const void *%2$s__elf_bytes(size_t *sz) \n\ 1011 { \n\ 1012 *sz = %1$d; \n\ 1013 return (const void *)\"\\ \n\ 1014 " 1015 , file_sz, obj_name); 1016 1017 /* embed contents of BPF object file */ 1018 print_hex(obj_data, file_sz); 1019 1020 codegen("\ 1021 \n\ 1022 \"; \n\ 1023 } \n\ 1024 \n\ 1025 #endif /* %s */ \n\ 1026 ", 1027 header_guard); 1028 err = 0; 1029 out: 1030 bpf_object__close(obj); 1031 if (obj_data) 1032 munmap(obj_data, mmap_sz); 1033 close(fd); 1034 return err; 1035 } 1036 1037 static int do_object(int argc, char **argv) 1038 { 1039 struct bpf_linker *linker; 1040 const char *output_file, *file; 1041 int err = 0; 1042 1043 if (!REQ_ARGS(2)) { 1044 usage(); 1045 return -1; 1046 } 1047 1048 output_file = GET_ARG(); 1049 1050 linker = bpf_linker__new(output_file, NULL); 1051 if (!linker) { 1052 p_err("failed to create BPF linker instance"); 1053 return -1; 1054 } 1055 1056 while (argc) { 1057 file = GET_ARG(); 1058 1059 err = bpf_linker__add_file(linker, file, NULL); 1060 if (err) { 1061 p_err("failed to link '%s': %s (%d)", file, strerror(err), err); 1062 goto out; 1063 } 1064 } 1065 1066 err = bpf_linker__finalize(linker); 1067 if (err) { 1068 p_err("failed to finalize ELF file: %s (%d)", strerror(err), err); 1069 goto out; 1070 } 1071 1072 err = 0; 1073 out: 1074 bpf_linker__free(linker); 1075 return err; 1076 } 1077 1078 static int do_help(int argc, char **argv) 1079 { 1080 if (json_output) { 1081 jsonw_null(json_wtr); 1082 return 0; 1083 } 1084 1085 fprintf(stderr, 1086 "Usage: %1$s %2$s object OUTPUT_FILE INPUT_FILE [INPUT_FILE...]\n" 1087 " %1$s %2$s skeleton FILE [name OBJECT_NAME]\n" 1088 " %1$s %2$s help\n" 1089 "\n" 1090 " " HELP_SPEC_OPTIONS " |\n" 1091 " {-L|--use-loader} }\n" 1092 "", 1093 bin_name, "gen"); 1094 1095 return 0; 1096 } 1097 1098 static const struct cmd cmds[] = { 1099 { "object", do_object }, 1100 { "skeleton", do_skeleton }, 1101 { "help", do_help }, 1102 { 0 } 1103 }; 1104 1105 int do_gen(int argc, char **argv) 1106 { 1107 return cmd_select(cmds, argc, argv, do_help); 1108 } 1109