1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */ 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 <ftw.h> 11 #include <libgen.h> 12 #include <mntent.h> 13 #include <stdbool.h> 14 #include <stdio.h> 15 #include <stdlib.h> 16 #include <string.h> 17 #include <unistd.h> 18 #include <net/if.h> 19 #include <sys/mount.h> 20 #include <sys/resource.h> 21 #include <sys/stat.h> 22 #include <sys/vfs.h> 23 24 #include <linux/filter.h> 25 #include <linux/limits.h> 26 #include <linux/magic.h> 27 #include <linux/unistd.h> 28 29 #include <bpf/bpf.h> 30 #include <bpf/hashmap.h> 31 #include <bpf/libbpf.h> /* libbpf_num_possible_cpus */ 32 #include <bpf/btf.h> 33 34 #include "main.h" 35 36 #ifndef BPF_FS_MAGIC 37 #define BPF_FS_MAGIC 0xcafe4a11 38 #endif 39 40 void p_err(const char *fmt, ...) 41 { 42 va_list ap; 43 44 va_start(ap, fmt); 45 if (json_output) { 46 jsonw_start_object(json_wtr); 47 jsonw_name(json_wtr, "error"); 48 jsonw_vprintf_enquote(json_wtr, fmt, ap); 49 jsonw_end_object(json_wtr); 50 } else { 51 fprintf(stderr, "Error: "); 52 vfprintf(stderr, fmt, ap); 53 fprintf(stderr, "\n"); 54 } 55 va_end(ap); 56 } 57 58 void p_info(const char *fmt, ...) 59 { 60 va_list ap; 61 62 if (json_output) 63 return; 64 65 va_start(ap, fmt); 66 vfprintf(stderr, fmt, ap); 67 fprintf(stderr, "\n"); 68 va_end(ap); 69 } 70 71 static bool is_bpffs(char *path) 72 { 73 struct statfs st_fs; 74 75 if (statfs(path, &st_fs) < 0) 76 return false; 77 78 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC; 79 } 80 81 /* Probe whether kernel switched from memlock-based (RLIMIT_MEMLOCK) to 82 * memcg-based memory accounting for BPF maps and programs. This was done in 83 * commit 97306be45fbe ("Merge branch 'switch to memcg-based memory 84 * accounting'"), in Linux 5.11. 85 * 86 * Libbpf also offers to probe for memcg-based accounting vs rlimit, but does 87 * so by checking for the availability of a given BPF helper and this has 88 * failed on some kernels with backports in the past, see commit 6b4384ff1088 89 * ("Revert "bpftool: Use libbpf 1.0 API mode instead of RLIMIT_MEMLOCK""). 90 * Instead, we can probe by lowering the process-based rlimit to 0, trying to 91 * load a BPF object, and resetting the rlimit. If the load succeeds then 92 * memcg-based accounting is supported. 93 * 94 * This would be too dangerous to do in the library, because multithreaded 95 * applications might attempt to load items while the rlimit is at 0. Given 96 * that bpftool is single-threaded, this is fine to do here. 97 */ 98 static bool known_to_need_rlimit(void) 99 { 100 struct rlimit rlim_init, rlim_cur_zero = {}; 101 struct bpf_insn insns[] = { 102 BPF_MOV64_IMM(BPF_REG_0, 0), 103 BPF_EXIT_INSN(), 104 }; 105 size_t insn_cnt = ARRAY_SIZE(insns); 106 union bpf_attr attr; 107 int prog_fd, err; 108 109 memset(&attr, 0, sizeof(attr)); 110 attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER; 111 attr.insns = ptr_to_u64(insns); 112 attr.insn_cnt = insn_cnt; 113 attr.license = ptr_to_u64("GPL"); 114 115 if (getrlimit(RLIMIT_MEMLOCK, &rlim_init)) 116 return false; 117 118 /* Drop the soft limit to zero. We maintain the hard limit to its 119 * current value, because lowering it would be a permanent operation 120 * for unprivileged users. 121 */ 122 rlim_cur_zero.rlim_max = rlim_init.rlim_max; 123 if (setrlimit(RLIMIT_MEMLOCK, &rlim_cur_zero)) 124 return false; 125 126 /* Do not use bpf_prog_load() from libbpf here, because it calls 127 * bump_rlimit_memlock(), interfering with the current probe. 128 */ 129 prog_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); 130 err = errno; 131 132 /* reset soft rlimit to its initial value */ 133 setrlimit(RLIMIT_MEMLOCK, &rlim_init); 134 135 if (prog_fd < 0) 136 return err == EPERM; 137 138 close(prog_fd); 139 return false; 140 } 141 142 void set_max_rlimit(void) 143 { 144 struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY }; 145 146 if (known_to_need_rlimit()) 147 setrlimit(RLIMIT_MEMLOCK, &rinf); 148 } 149 150 static int 151 mnt_fs(const char *target, const char *type, char *buff, size_t bufflen) 152 { 153 bool bind_done = false; 154 155 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) { 156 if (errno != EINVAL || bind_done) { 157 snprintf(buff, bufflen, 158 "mount --make-private %s failed: %s", 159 target, strerror(errno)); 160 return -1; 161 } 162 163 if (mount(target, target, "none", MS_BIND, NULL)) { 164 snprintf(buff, bufflen, 165 "mount --bind %s %s failed: %s", 166 target, target, strerror(errno)); 167 return -1; 168 } 169 170 bind_done = true; 171 } 172 173 if (mount(type, target, type, 0, "mode=0700")) { 174 snprintf(buff, bufflen, "mount -t %s %s %s failed: %s", 175 type, type, target, strerror(errno)); 176 return -1; 177 } 178 179 return 0; 180 } 181 182 int mount_tracefs(const char *target) 183 { 184 char err_str[ERR_MAX_LEN]; 185 int err; 186 187 err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN); 188 if (err) { 189 err_str[ERR_MAX_LEN - 1] = '\0'; 190 p_err("can't mount tracefs: %s", err_str); 191 } 192 193 return err; 194 } 195 196 int open_obj_pinned(const char *path, bool quiet) 197 { 198 char *pname; 199 int fd = -1; 200 201 pname = strdup(path); 202 if (!pname) { 203 if (!quiet) 204 p_err("mem alloc failed"); 205 goto out_ret; 206 } 207 208 fd = bpf_obj_get(pname); 209 if (fd < 0) { 210 if (!quiet) 211 p_err("bpf obj get (%s): %s", pname, 212 errno == EACCES && !is_bpffs(dirname(pname)) ? 213 "directory not in bpf file system (bpffs)" : 214 strerror(errno)); 215 goto out_free; 216 } 217 218 out_free: 219 free(pname); 220 out_ret: 221 return fd; 222 } 223 224 int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type) 225 { 226 enum bpf_obj_type type; 227 int fd; 228 229 fd = open_obj_pinned(path, false); 230 if (fd < 0) 231 return -1; 232 233 type = get_fd_type(fd); 234 if (type < 0) { 235 close(fd); 236 return type; 237 } 238 if (type != exp_type) { 239 p_err("incorrect object type: %s", get_fd_type_name(type)); 240 close(fd); 241 return -1; 242 } 243 244 return fd; 245 } 246 247 int mount_bpffs_for_pin(const char *name) 248 { 249 char err_str[ERR_MAX_LEN]; 250 char *file; 251 char *dir; 252 int err = 0; 253 254 file = malloc(strlen(name) + 1); 255 if (!file) { 256 p_err("mem alloc failed"); 257 return -1; 258 } 259 260 strcpy(file, name); 261 dir = dirname(file); 262 263 if (is_bpffs(dir)) 264 /* nothing to do if already mounted */ 265 goto out_free; 266 267 if (block_mount) { 268 p_err("no BPF file system found, not mounting it due to --nomount option"); 269 err = -1; 270 goto out_free; 271 } 272 273 err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN); 274 if (err) { 275 err_str[ERR_MAX_LEN - 1] = '\0'; 276 p_err("can't mount BPF file system to pin the object (%s): %s", 277 name, err_str); 278 } 279 280 out_free: 281 free(file); 282 return err; 283 } 284 285 int do_pin_fd(int fd, const char *name) 286 { 287 int err; 288 289 err = mount_bpffs_for_pin(name); 290 if (err) 291 return err; 292 293 err = bpf_obj_pin(fd, name); 294 if (err) 295 p_err("can't pin the object (%s): %s", name, strerror(errno)); 296 297 return err; 298 } 299 300 int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***)) 301 { 302 int err; 303 int fd; 304 305 fd = get_fd(&argc, &argv); 306 if (fd < 0) 307 return fd; 308 309 err = do_pin_fd(fd, *argv); 310 311 close(fd); 312 return err; 313 } 314 315 const char *get_fd_type_name(enum bpf_obj_type type) 316 { 317 static const char * const names[] = { 318 [BPF_OBJ_UNKNOWN] = "unknown", 319 [BPF_OBJ_PROG] = "prog", 320 [BPF_OBJ_MAP] = "map", 321 [BPF_OBJ_LINK] = "link", 322 }; 323 324 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) 325 return names[BPF_OBJ_UNKNOWN]; 326 327 return names[type]; 328 } 329 330 void get_prog_full_name(const struct bpf_prog_info *prog_info, int prog_fd, 331 char *name_buff, size_t buff_len) 332 { 333 const char *prog_name = prog_info->name; 334 const struct btf_type *func_type; 335 const struct bpf_func_info finfo = {}; 336 struct bpf_prog_info info = {}; 337 __u32 info_len = sizeof(info); 338 struct btf *prog_btf = NULL; 339 340 if (buff_len <= BPF_OBJ_NAME_LEN || 341 strlen(prog_info->name) < BPF_OBJ_NAME_LEN - 1) 342 goto copy_name; 343 344 if (!prog_info->btf_id || prog_info->nr_func_info == 0) 345 goto copy_name; 346 347 info.nr_func_info = 1; 348 info.func_info_rec_size = prog_info->func_info_rec_size; 349 if (info.func_info_rec_size > sizeof(finfo)) 350 info.func_info_rec_size = sizeof(finfo); 351 info.func_info = ptr_to_u64(&finfo); 352 353 if (bpf_obj_get_info_by_fd(prog_fd, &info, &info_len)) 354 goto copy_name; 355 356 prog_btf = btf__load_from_kernel_by_id(info.btf_id); 357 if (!prog_btf) 358 goto copy_name; 359 360 func_type = btf__type_by_id(prog_btf, finfo.type_id); 361 if (!func_type || !btf_is_func(func_type)) 362 goto copy_name; 363 364 prog_name = btf__name_by_offset(prog_btf, func_type->name_off); 365 366 copy_name: 367 snprintf(name_buff, buff_len, "%s", prog_name); 368 369 if (prog_btf) 370 btf__free(prog_btf); 371 } 372 373 int get_fd_type(int fd) 374 { 375 char path[PATH_MAX]; 376 char buf[512]; 377 ssize_t n; 378 379 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); 380 381 n = readlink(path, buf, sizeof(buf)); 382 if (n < 0) { 383 p_err("can't read link type: %s", strerror(errno)); 384 return -1; 385 } 386 if (n == sizeof(path)) { 387 p_err("can't read link type: path too long!"); 388 return -1; 389 } 390 391 if (strstr(buf, "bpf-map")) 392 return BPF_OBJ_MAP; 393 else if (strstr(buf, "bpf-prog")) 394 return BPF_OBJ_PROG; 395 else if (strstr(buf, "bpf-link")) 396 return BPF_OBJ_LINK; 397 398 return BPF_OBJ_UNKNOWN; 399 } 400 401 char *get_fdinfo(int fd, const char *key) 402 { 403 char path[PATH_MAX]; 404 char *line = NULL; 405 size_t line_n = 0; 406 ssize_t n; 407 FILE *fdi; 408 409 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); 410 411 fdi = fopen(path, "r"); 412 if (!fdi) 413 return NULL; 414 415 while ((n = getline(&line, &line_n, fdi)) > 0) { 416 char *value; 417 int len; 418 419 if (!strstr(line, key)) 420 continue; 421 422 fclose(fdi); 423 424 value = strchr(line, '\t'); 425 if (!value || !value[1]) { 426 free(line); 427 return NULL; 428 } 429 value++; 430 431 len = strlen(value); 432 memmove(line, value, len); 433 line[len - 1] = '\0'; 434 435 return line; 436 } 437 438 free(line); 439 fclose(fdi); 440 return NULL; 441 } 442 443 void print_data_json(uint8_t *data, size_t len) 444 { 445 unsigned int i; 446 447 jsonw_start_array(json_wtr); 448 for (i = 0; i < len; i++) 449 jsonw_printf(json_wtr, "%d", data[i]); 450 jsonw_end_array(json_wtr); 451 } 452 453 void print_hex_data_json(uint8_t *data, size_t len) 454 { 455 unsigned int i; 456 457 jsonw_start_array(json_wtr); 458 for (i = 0; i < len; i++) 459 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); 460 jsonw_end_array(json_wtr); 461 } 462 463 /* extra params for nftw cb */ 464 static struct hashmap *build_fn_table; 465 static enum bpf_obj_type build_fn_type; 466 467 static int do_build_table_cb(const char *fpath, const struct stat *sb, 468 int typeflag, struct FTW *ftwbuf) 469 { 470 struct bpf_prog_info pinned_info; 471 __u32 len = sizeof(pinned_info); 472 enum bpf_obj_type objtype; 473 int fd, err = 0; 474 char *path; 475 476 if (typeflag != FTW_F) 477 goto out_ret; 478 479 fd = open_obj_pinned(fpath, true); 480 if (fd < 0) 481 goto out_ret; 482 483 objtype = get_fd_type(fd); 484 if (objtype != build_fn_type) 485 goto out_close; 486 487 memset(&pinned_info, 0, sizeof(pinned_info)); 488 if (bpf_obj_get_info_by_fd(fd, &pinned_info, &len)) 489 goto out_close; 490 491 path = strdup(fpath); 492 if (!path) { 493 err = -1; 494 goto out_close; 495 } 496 497 err = hashmap__append(build_fn_table, u32_as_hash_field(pinned_info.id), path); 498 if (err) { 499 p_err("failed to append entry to hashmap for ID %u, path '%s': %s", 500 pinned_info.id, path, strerror(errno)); 501 goto out_close; 502 } 503 504 out_close: 505 close(fd); 506 out_ret: 507 return err; 508 } 509 510 int build_pinned_obj_table(struct hashmap *tab, 511 enum bpf_obj_type type) 512 { 513 struct mntent *mntent = NULL; 514 FILE *mntfile = NULL; 515 int flags = FTW_PHYS; 516 int nopenfd = 16; 517 int err = 0; 518 519 mntfile = setmntent("/proc/mounts", "r"); 520 if (!mntfile) 521 return -1; 522 523 build_fn_table = tab; 524 build_fn_type = type; 525 526 while ((mntent = getmntent(mntfile))) { 527 char *path = mntent->mnt_dir; 528 529 if (strncmp(mntent->mnt_type, "bpf", 3) != 0) 530 continue; 531 err = nftw(path, do_build_table_cb, nopenfd, flags); 532 if (err) 533 break; 534 } 535 fclose(mntfile); 536 return err; 537 } 538 539 void delete_pinned_obj_table(struct hashmap *map) 540 { 541 struct hashmap_entry *entry; 542 size_t bkt; 543 544 if (!map) 545 return; 546 547 hashmap__for_each_entry(map, entry, bkt) 548 free(entry->value); 549 550 hashmap__free(map); 551 } 552 553 unsigned int get_page_size(void) 554 { 555 static int result; 556 557 if (!result) 558 result = getpagesize(); 559 return result; 560 } 561 562 unsigned int get_possible_cpus(void) 563 { 564 int cpus = libbpf_num_possible_cpus(); 565 566 if (cpus < 0) { 567 p_err("Can't get # of possible cpus: %s", strerror(-cpus)); 568 exit(-1); 569 } 570 return cpus; 571 } 572 573 static char * 574 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) 575 { 576 struct stat st; 577 int err; 578 579 err = stat("/proc/self/ns/net", &st); 580 if (err) { 581 p_err("Can't stat /proc/self: %s", strerror(errno)); 582 return NULL; 583 } 584 585 if (st.st_dev != ns_dev || st.st_ino != ns_ino) 586 return NULL; 587 588 return if_indextoname(ifindex, buf); 589 } 590 591 static int read_sysfs_hex_int(char *path) 592 { 593 char vendor_id_buf[8]; 594 int len; 595 int fd; 596 597 fd = open(path, O_RDONLY); 598 if (fd < 0) { 599 p_err("Can't open %s: %s", path, strerror(errno)); 600 return -1; 601 } 602 603 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); 604 close(fd); 605 if (len < 0) { 606 p_err("Can't read %s: %s", path, strerror(errno)); 607 return -1; 608 } 609 if (len >= (int)sizeof(vendor_id_buf)) { 610 p_err("Value in %s too long", path); 611 return -1; 612 } 613 614 vendor_id_buf[len] = 0; 615 616 return strtol(vendor_id_buf, NULL, 0); 617 } 618 619 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) 620 { 621 char full_path[64]; 622 623 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", 624 devname, entry_name); 625 626 return read_sysfs_hex_int(full_path); 627 } 628 629 const char * 630 ifindex_to_arch(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, const char **opt) 631 { 632 __maybe_unused int device_id; 633 char devname[IF_NAMESIZE]; 634 int vendor_id; 635 636 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { 637 p_err("Can't get net device name for ifindex %d: %s", ifindex, 638 strerror(errno)); 639 return NULL; 640 } 641 642 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); 643 if (vendor_id < 0) { 644 p_err("Can't get device vendor id for %s", devname); 645 return NULL; 646 } 647 648 switch (vendor_id) { 649 #ifdef HAVE_LIBBFD_SUPPORT 650 case 0x19ee: 651 device_id = read_sysfs_netdev_hex_int(devname, "device"); 652 if (device_id != 0x4000 && 653 device_id != 0x6000 && 654 device_id != 0x6003) 655 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); 656 *opt = "ctx4"; 657 return "NFP-6xxx"; 658 #endif /* HAVE_LIBBFD_SUPPORT */ 659 /* No NFP support in LLVM, we have no valid triple to return. */ 660 default: 661 p_err("Can't get arch name for device vendor id 0x%04x", 662 vendor_id); 663 return NULL; 664 } 665 } 666 667 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 668 { 669 char name[IF_NAMESIZE]; 670 671 if (!ifindex) 672 return; 673 674 printf(" offloaded_to "); 675 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 676 printf("%s", name); 677 else 678 printf("ifindex %u ns_dev %llu ns_ino %llu", 679 ifindex, ns_dev, ns_inode); 680 } 681 682 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 683 { 684 char name[IF_NAMESIZE]; 685 686 if (!ifindex) 687 return; 688 689 jsonw_name(json_wtr, "dev"); 690 jsonw_start_object(json_wtr); 691 jsonw_uint_field(json_wtr, "ifindex", ifindex); 692 jsonw_uint_field(json_wtr, "ns_dev", ns_dev); 693 jsonw_uint_field(json_wtr, "ns_inode", ns_inode); 694 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 695 jsonw_string_field(json_wtr, "ifname", name); 696 jsonw_end_object(json_wtr); 697 } 698 699 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what) 700 { 701 char *endptr; 702 703 NEXT_ARGP(); 704 705 if (*val) { 706 p_err("%s already specified", what); 707 return -1; 708 } 709 710 *val = strtoul(**argv, &endptr, 0); 711 if (*endptr) { 712 p_err("can't parse %s as %s", **argv, what); 713 return -1; 714 } 715 NEXT_ARGP(); 716 717 return 0; 718 } 719 720 int __printf(2, 0) 721 print_all_levels(__maybe_unused enum libbpf_print_level level, 722 const char *format, va_list args) 723 { 724 return vfprintf(stderr, format, args); 725 } 726 727 static int prog_fd_by_nametag(void *nametag, int **fds, bool tag) 728 { 729 char prog_name[MAX_PROG_FULL_NAME]; 730 unsigned int id = 0; 731 int fd, nb_fds = 0; 732 void *tmp; 733 int err; 734 735 while (true) { 736 struct bpf_prog_info info = {}; 737 __u32 len = sizeof(info); 738 739 err = bpf_prog_get_next_id(id, &id); 740 if (err) { 741 if (errno != ENOENT) { 742 p_err("%s", strerror(errno)); 743 goto err_close_fds; 744 } 745 return nb_fds; 746 } 747 748 fd = bpf_prog_get_fd_by_id(id); 749 if (fd < 0) { 750 p_err("can't get prog by id (%u): %s", 751 id, strerror(errno)); 752 goto err_close_fds; 753 } 754 755 err = bpf_obj_get_info_by_fd(fd, &info, &len); 756 if (err) { 757 p_err("can't get prog info (%u): %s", 758 id, strerror(errno)); 759 goto err_close_fd; 760 } 761 762 if (tag && memcmp(nametag, info.tag, BPF_TAG_SIZE)) { 763 close(fd); 764 continue; 765 } 766 767 if (!tag) { 768 get_prog_full_name(&info, fd, prog_name, 769 sizeof(prog_name)); 770 if (strncmp(nametag, prog_name, sizeof(prog_name))) { 771 close(fd); 772 continue; 773 } 774 } 775 776 if (nb_fds > 0) { 777 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int)); 778 if (!tmp) { 779 p_err("failed to realloc"); 780 goto err_close_fd; 781 } 782 *fds = tmp; 783 } 784 (*fds)[nb_fds++] = fd; 785 } 786 787 err_close_fd: 788 close(fd); 789 err_close_fds: 790 while (--nb_fds >= 0) 791 close((*fds)[nb_fds]); 792 return -1; 793 } 794 795 int prog_parse_fds(int *argc, char ***argv, int **fds) 796 { 797 if (is_prefix(**argv, "id")) { 798 unsigned int id; 799 char *endptr; 800 801 NEXT_ARGP(); 802 803 id = strtoul(**argv, &endptr, 0); 804 if (*endptr) { 805 p_err("can't parse %s as ID", **argv); 806 return -1; 807 } 808 NEXT_ARGP(); 809 810 (*fds)[0] = bpf_prog_get_fd_by_id(id); 811 if ((*fds)[0] < 0) { 812 p_err("get by id (%u): %s", id, strerror(errno)); 813 return -1; 814 } 815 return 1; 816 } else if (is_prefix(**argv, "tag")) { 817 unsigned char tag[BPF_TAG_SIZE]; 818 819 NEXT_ARGP(); 820 821 if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2, 822 tag + 3, tag + 4, tag + 5, tag + 6, tag + 7) 823 != BPF_TAG_SIZE) { 824 p_err("can't parse tag"); 825 return -1; 826 } 827 NEXT_ARGP(); 828 829 return prog_fd_by_nametag(tag, fds, true); 830 } else if (is_prefix(**argv, "name")) { 831 char *name; 832 833 NEXT_ARGP(); 834 835 name = **argv; 836 if (strlen(name) > MAX_PROG_FULL_NAME - 1) { 837 p_err("can't parse name"); 838 return -1; 839 } 840 NEXT_ARGP(); 841 842 return prog_fd_by_nametag(name, fds, false); 843 } else if (is_prefix(**argv, "pinned")) { 844 char *path; 845 846 NEXT_ARGP(); 847 848 path = **argv; 849 NEXT_ARGP(); 850 851 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG); 852 if ((*fds)[0] < 0) 853 return -1; 854 return 1; 855 } 856 857 p_err("expected 'id', 'tag', 'name' or 'pinned', got: '%s'?", **argv); 858 return -1; 859 } 860 861 int prog_parse_fd(int *argc, char ***argv) 862 { 863 int *fds = NULL; 864 int nb_fds, fd; 865 866 fds = malloc(sizeof(int)); 867 if (!fds) { 868 p_err("mem alloc failed"); 869 return -1; 870 } 871 nb_fds = prog_parse_fds(argc, argv, &fds); 872 if (nb_fds != 1) { 873 if (nb_fds > 1) { 874 p_err("several programs match this handle"); 875 while (nb_fds--) 876 close(fds[nb_fds]); 877 } 878 fd = -1; 879 goto exit_free; 880 } 881 882 fd = fds[0]; 883 exit_free: 884 free(fds); 885 return fd; 886 } 887 888 static int map_fd_by_name(char *name, int **fds) 889 { 890 unsigned int id = 0; 891 int fd, nb_fds = 0; 892 void *tmp; 893 int err; 894 895 while (true) { 896 struct bpf_map_info info = {}; 897 __u32 len = sizeof(info); 898 899 err = bpf_map_get_next_id(id, &id); 900 if (err) { 901 if (errno != ENOENT) { 902 p_err("%s", strerror(errno)); 903 goto err_close_fds; 904 } 905 return nb_fds; 906 } 907 908 fd = bpf_map_get_fd_by_id(id); 909 if (fd < 0) { 910 p_err("can't get map by id (%u): %s", 911 id, strerror(errno)); 912 goto err_close_fds; 913 } 914 915 err = bpf_obj_get_info_by_fd(fd, &info, &len); 916 if (err) { 917 p_err("can't get map info (%u): %s", 918 id, strerror(errno)); 919 goto err_close_fd; 920 } 921 922 if (strncmp(name, info.name, BPF_OBJ_NAME_LEN)) { 923 close(fd); 924 continue; 925 } 926 927 if (nb_fds > 0) { 928 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int)); 929 if (!tmp) { 930 p_err("failed to realloc"); 931 goto err_close_fd; 932 } 933 *fds = tmp; 934 } 935 (*fds)[nb_fds++] = fd; 936 } 937 938 err_close_fd: 939 close(fd); 940 err_close_fds: 941 while (--nb_fds >= 0) 942 close((*fds)[nb_fds]); 943 return -1; 944 } 945 946 int map_parse_fds(int *argc, char ***argv, int **fds) 947 { 948 if (is_prefix(**argv, "id")) { 949 unsigned int id; 950 char *endptr; 951 952 NEXT_ARGP(); 953 954 id = strtoul(**argv, &endptr, 0); 955 if (*endptr) { 956 p_err("can't parse %s as ID", **argv); 957 return -1; 958 } 959 NEXT_ARGP(); 960 961 (*fds)[0] = bpf_map_get_fd_by_id(id); 962 if ((*fds)[0] < 0) { 963 p_err("get map by id (%u): %s", id, strerror(errno)); 964 return -1; 965 } 966 return 1; 967 } else if (is_prefix(**argv, "name")) { 968 char *name; 969 970 NEXT_ARGP(); 971 972 name = **argv; 973 if (strlen(name) > BPF_OBJ_NAME_LEN - 1) { 974 p_err("can't parse name"); 975 return -1; 976 } 977 NEXT_ARGP(); 978 979 return map_fd_by_name(name, fds); 980 } else if (is_prefix(**argv, "pinned")) { 981 char *path; 982 983 NEXT_ARGP(); 984 985 path = **argv; 986 NEXT_ARGP(); 987 988 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP); 989 if ((*fds)[0] < 0) 990 return -1; 991 return 1; 992 } 993 994 p_err("expected 'id', 'name' or 'pinned', got: '%s'?", **argv); 995 return -1; 996 } 997 998 int map_parse_fd(int *argc, char ***argv) 999 { 1000 int *fds = NULL; 1001 int nb_fds, fd; 1002 1003 fds = malloc(sizeof(int)); 1004 if (!fds) { 1005 p_err("mem alloc failed"); 1006 return -1; 1007 } 1008 nb_fds = map_parse_fds(argc, argv, &fds); 1009 if (nb_fds != 1) { 1010 if (nb_fds > 1) { 1011 p_err("several maps match this handle"); 1012 while (nb_fds--) 1013 close(fds[nb_fds]); 1014 } 1015 fd = -1; 1016 goto exit_free; 1017 } 1018 1019 fd = fds[0]; 1020 exit_free: 1021 free(fds); 1022 return fd; 1023 } 1024 1025 int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len) 1026 { 1027 int err; 1028 int fd; 1029 1030 fd = map_parse_fd(argc, argv); 1031 if (fd < 0) 1032 return -1; 1033 1034 err = bpf_obj_get_info_by_fd(fd, info, info_len); 1035 if (err) { 1036 p_err("can't get map info: %s", strerror(errno)); 1037 close(fd); 1038 return err; 1039 } 1040 1041 return fd; 1042 } 1043 1044 size_t hash_fn_for_key_as_id(const void *key, void *ctx) 1045 { 1046 return (size_t)key; 1047 } 1048 1049 bool equal_fn_for_key_as_id(const void *k1, const void *k2, void *ctx) 1050 { 1051 return k1 == k2; 1052 } 1053 1054 const char *bpf_attach_type_input_str(enum bpf_attach_type t) 1055 { 1056 switch (t) { 1057 case BPF_CGROUP_INET_INGRESS: return "ingress"; 1058 case BPF_CGROUP_INET_EGRESS: return "egress"; 1059 case BPF_CGROUP_INET_SOCK_CREATE: return "sock_create"; 1060 case BPF_CGROUP_INET_SOCK_RELEASE: return "sock_release"; 1061 case BPF_CGROUP_SOCK_OPS: return "sock_ops"; 1062 case BPF_CGROUP_DEVICE: return "device"; 1063 case BPF_CGROUP_INET4_BIND: return "bind4"; 1064 case BPF_CGROUP_INET6_BIND: return "bind6"; 1065 case BPF_CGROUP_INET4_CONNECT: return "connect4"; 1066 case BPF_CGROUP_INET6_CONNECT: return "connect6"; 1067 case BPF_CGROUP_INET4_POST_BIND: return "post_bind4"; 1068 case BPF_CGROUP_INET6_POST_BIND: return "post_bind6"; 1069 case BPF_CGROUP_INET4_GETPEERNAME: return "getpeername4"; 1070 case BPF_CGROUP_INET6_GETPEERNAME: return "getpeername6"; 1071 case BPF_CGROUP_INET4_GETSOCKNAME: return "getsockname4"; 1072 case BPF_CGROUP_INET6_GETSOCKNAME: return "getsockname6"; 1073 case BPF_CGROUP_UDP4_SENDMSG: return "sendmsg4"; 1074 case BPF_CGROUP_UDP6_SENDMSG: return "sendmsg6"; 1075 case BPF_CGROUP_SYSCTL: return "sysctl"; 1076 case BPF_CGROUP_UDP4_RECVMSG: return "recvmsg4"; 1077 case BPF_CGROUP_UDP6_RECVMSG: return "recvmsg6"; 1078 case BPF_CGROUP_GETSOCKOPT: return "getsockopt"; 1079 case BPF_CGROUP_SETSOCKOPT: return "setsockopt"; 1080 case BPF_TRACE_RAW_TP: return "raw_tp"; 1081 case BPF_TRACE_FENTRY: return "fentry"; 1082 case BPF_TRACE_FEXIT: return "fexit"; 1083 case BPF_MODIFY_RETURN: return "mod_ret"; 1084 case BPF_SK_REUSEPORT_SELECT: return "sk_skb_reuseport_select"; 1085 case BPF_SK_REUSEPORT_SELECT_OR_MIGRATE: return "sk_skb_reuseport_select_or_migrate"; 1086 default: return libbpf_bpf_attach_type_str(t); 1087 } 1088 } 1089