1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */ 3 4 #define _GNU_SOURCE 5 #include <ctype.h> 6 #include <errno.h> 7 #include <fcntl.h> 8 #include <ftw.h> 9 #include <libgen.h> 10 #include <mntent.h> 11 #include <stdbool.h> 12 #include <stdio.h> 13 #include <stdlib.h> 14 #include <string.h> 15 #include <unistd.h> 16 #include <net/if.h> 17 #include <sys/mount.h> 18 #include <sys/resource.h> 19 #include <sys/stat.h> 20 #include <sys/vfs.h> 21 22 #include <linux/filter.h> 23 #include <linux/limits.h> 24 #include <linux/magic.h> 25 #include <linux/unistd.h> 26 27 #include <bpf/bpf.h> 28 #include <bpf/hashmap.h> 29 #include <bpf/libbpf.h> /* libbpf_num_possible_cpus */ 30 #include <bpf/btf.h> 31 32 #include "main.h" 33 34 #ifndef BPF_FS_MAGIC 35 #define BPF_FS_MAGIC 0xcafe4a11 36 #endif 37 38 void p_err(const char *fmt, ...) 39 { 40 va_list ap; 41 42 va_start(ap, fmt); 43 if (json_output) { 44 jsonw_start_object(json_wtr); 45 jsonw_name(json_wtr, "error"); 46 jsonw_vprintf_enquote(json_wtr, fmt, ap); 47 jsonw_end_object(json_wtr); 48 } else { 49 fprintf(stderr, "Error: "); 50 vfprintf(stderr, fmt, ap); 51 fprintf(stderr, "\n"); 52 } 53 va_end(ap); 54 } 55 56 void p_info(const char *fmt, ...) 57 { 58 va_list ap; 59 60 if (json_output) 61 return; 62 63 va_start(ap, fmt); 64 vfprintf(stderr, fmt, ap); 65 fprintf(stderr, "\n"); 66 va_end(ap); 67 } 68 69 static bool is_bpffs(char *path) 70 { 71 struct statfs st_fs; 72 73 if (statfs(path, &st_fs) < 0) 74 return false; 75 76 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC; 77 } 78 79 /* Probe whether kernel switched from memlock-based (RLIMIT_MEMLOCK) to 80 * memcg-based memory accounting for BPF maps and programs. This was done in 81 * commit 97306be45fbe ("Merge branch 'switch to memcg-based memory 82 * accounting'"), in Linux 5.11. 83 * 84 * Libbpf also offers to probe for memcg-based accounting vs rlimit, but does 85 * so by checking for the availability of a given BPF helper and this has 86 * failed on some kernels with backports in the past, see commit 6b4384ff1088 87 * ("Revert "bpftool: Use libbpf 1.0 API mode instead of RLIMIT_MEMLOCK""). 88 * Instead, we can probe by lowering the process-based rlimit to 0, trying to 89 * load a BPF object, and resetting the rlimit. If the load succeeds then 90 * memcg-based accounting is supported. 91 * 92 * This would be too dangerous to do in the library, because multithreaded 93 * applications might attempt to load items while the rlimit is at 0. Given 94 * that bpftool is single-threaded, this is fine to do here. 95 */ 96 static bool known_to_need_rlimit(void) 97 { 98 struct rlimit rlim_init, rlim_cur_zero = {}; 99 struct bpf_insn insns[] = { 100 BPF_MOV64_IMM(BPF_REG_0, 0), 101 BPF_EXIT_INSN(), 102 }; 103 size_t insn_cnt = ARRAY_SIZE(insns); 104 union bpf_attr attr; 105 int prog_fd, err; 106 107 memset(&attr, 0, sizeof(attr)); 108 attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER; 109 attr.insns = ptr_to_u64(insns); 110 attr.insn_cnt = insn_cnt; 111 attr.license = ptr_to_u64("GPL"); 112 113 if (getrlimit(RLIMIT_MEMLOCK, &rlim_init)) 114 return false; 115 116 /* Drop the soft limit to zero. We maintain the hard limit to its 117 * current value, because lowering it would be a permanent operation 118 * for unprivileged users. 119 */ 120 rlim_cur_zero.rlim_max = rlim_init.rlim_max; 121 if (setrlimit(RLIMIT_MEMLOCK, &rlim_cur_zero)) 122 return false; 123 124 /* Do not use bpf_prog_load() from libbpf here, because it calls 125 * bump_rlimit_memlock(), interfering with the current probe. 126 */ 127 prog_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); 128 err = errno; 129 130 /* reset soft rlimit to its initial value */ 131 setrlimit(RLIMIT_MEMLOCK, &rlim_init); 132 133 if (prog_fd < 0) 134 return err == EPERM; 135 136 close(prog_fd); 137 return false; 138 } 139 140 void set_max_rlimit(void) 141 { 142 struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY }; 143 144 if (known_to_need_rlimit()) 145 setrlimit(RLIMIT_MEMLOCK, &rinf); 146 } 147 148 static int 149 mnt_fs(const char *target, const char *type, char *buff, size_t bufflen) 150 { 151 bool bind_done = false; 152 153 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) { 154 if (errno != EINVAL || bind_done) { 155 snprintf(buff, bufflen, 156 "mount --make-private %s failed: %s", 157 target, strerror(errno)); 158 return -1; 159 } 160 161 if (mount(target, target, "none", MS_BIND, NULL)) { 162 snprintf(buff, bufflen, 163 "mount --bind %s %s failed: %s", 164 target, target, strerror(errno)); 165 return -1; 166 } 167 168 bind_done = true; 169 } 170 171 if (mount(type, target, type, 0, "mode=0700")) { 172 snprintf(buff, bufflen, "mount -t %s %s %s failed: %s", 173 type, type, target, strerror(errno)); 174 return -1; 175 } 176 177 return 0; 178 } 179 180 int mount_tracefs(const char *target) 181 { 182 char err_str[ERR_MAX_LEN]; 183 int err; 184 185 err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN); 186 if (err) { 187 err_str[ERR_MAX_LEN - 1] = '\0'; 188 p_err("can't mount tracefs: %s", err_str); 189 } 190 191 return err; 192 } 193 194 int open_obj_pinned(const char *path, bool quiet) 195 { 196 char *pname; 197 int fd = -1; 198 199 pname = strdup(path); 200 if (!pname) { 201 if (!quiet) 202 p_err("mem alloc failed"); 203 goto out_ret; 204 } 205 206 fd = bpf_obj_get(pname); 207 if (fd < 0) { 208 if (!quiet) 209 p_err("bpf obj get (%s): %s", pname, 210 errno == EACCES && !is_bpffs(dirname(pname)) ? 211 "directory not in bpf file system (bpffs)" : 212 strerror(errno)); 213 goto out_free; 214 } 215 216 out_free: 217 free(pname); 218 out_ret: 219 return fd; 220 } 221 222 int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type) 223 { 224 enum bpf_obj_type type; 225 int fd; 226 227 fd = open_obj_pinned(path, false); 228 if (fd < 0) 229 return -1; 230 231 type = get_fd_type(fd); 232 if (type < 0) { 233 close(fd); 234 return type; 235 } 236 if (type != exp_type) { 237 p_err("incorrect object type: %s", get_fd_type_name(type)); 238 close(fd); 239 return -1; 240 } 241 242 return fd; 243 } 244 245 int mount_bpffs_for_pin(const char *name) 246 { 247 char err_str[ERR_MAX_LEN]; 248 char *file; 249 char *dir; 250 int err = 0; 251 252 file = malloc(strlen(name) + 1); 253 if (!file) { 254 p_err("mem alloc failed"); 255 return -1; 256 } 257 258 strcpy(file, name); 259 dir = dirname(file); 260 261 if (is_bpffs(dir)) 262 /* nothing to do if already mounted */ 263 goto out_free; 264 265 if (block_mount) { 266 p_err("no BPF file system found, not mounting it due to --nomount option"); 267 err = -1; 268 goto out_free; 269 } 270 271 err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN); 272 if (err) { 273 err_str[ERR_MAX_LEN - 1] = '\0'; 274 p_err("can't mount BPF file system to pin the object (%s): %s", 275 name, err_str); 276 } 277 278 out_free: 279 free(file); 280 return err; 281 } 282 283 int do_pin_fd(int fd, const char *name) 284 { 285 int err; 286 287 err = mount_bpffs_for_pin(name); 288 if (err) 289 return err; 290 291 err = bpf_obj_pin(fd, name); 292 if (err) 293 p_err("can't pin the object (%s): %s", name, strerror(errno)); 294 295 return err; 296 } 297 298 int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***)) 299 { 300 int err; 301 int fd; 302 303 fd = get_fd(&argc, &argv); 304 if (fd < 0) 305 return fd; 306 307 err = do_pin_fd(fd, *argv); 308 309 close(fd); 310 return err; 311 } 312 313 const char *get_fd_type_name(enum bpf_obj_type type) 314 { 315 static const char * const names[] = { 316 [BPF_OBJ_UNKNOWN] = "unknown", 317 [BPF_OBJ_PROG] = "prog", 318 [BPF_OBJ_MAP] = "map", 319 }; 320 321 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) 322 return names[BPF_OBJ_UNKNOWN]; 323 324 return names[type]; 325 } 326 327 void get_prog_full_name(const struct bpf_prog_info *prog_info, int prog_fd, 328 char *name_buff, size_t buff_len) 329 { 330 const char *prog_name = prog_info->name; 331 const struct btf_type *func_type; 332 const struct bpf_func_info finfo = {}; 333 struct bpf_prog_info info = {}; 334 __u32 info_len = sizeof(info); 335 struct btf *prog_btf = NULL; 336 337 if (buff_len <= BPF_OBJ_NAME_LEN || 338 strlen(prog_info->name) < BPF_OBJ_NAME_LEN - 1) 339 goto copy_name; 340 341 if (!prog_info->btf_id || prog_info->nr_func_info == 0) 342 goto copy_name; 343 344 info.nr_func_info = 1; 345 info.func_info_rec_size = prog_info->func_info_rec_size; 346 if (info.func_info_rec_size > sizeof(finfo)) 347 info.func_info_rec_size = sizeof(finfo); 348 info.func_info = ptr_to_u64(&finfo); 349 350 if (bpf_obj_get_info_by_fd(prog_fd, &info, &info_len)) 351 goto copy_name; 352 353 prog_btf = btf__load_from_kernel_by_id(info.btf_id); 354 if (!prog_btf) 355 goto copy_name; 356 357 func_type = btf__type_by_id(prog_btf, finfo.type_id); 358 if (!func_type || !btf_is_func(func_type)) 359 goto copy_name; 360 361 prog_name = btf__name_by_offset(prog_btf, func_type->name_off); 362 363 copy_name: 364 snprintf(name_buff, buff_len, "%s", prog_name); 365 366 if (prog_btf) 367 btf__free(prog_btf); 368 } 369 370 int get_fd_type(int fd) 371 { 372 char path[PATH_MAX]; 373 char buf[512]; 374 ssize_t n; 375 376 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); 377 378 n = readlink(path, buf, sizeof(buf)); 379 if (n < 0) { 380 p_err("can't read link type: %s", strerror(errno)); 381 return -1; 382 } 383 if (n == sizeof(path)) { 384 p_err("can't read link type: path too long!"); 385 return -1; 386 } 387 388 if (strstr(buf, "bpf-map")) 389 return BPF_OBJ_MAP; 390 else if (strstr(buf, "bpf-prog")) 391 return BPF_OBJ_PROG; 392 else if (strstr(buf, "bpf-link")) 393 return BPF_OBJ_LINK; 394 395 return BPF_OBJ_UNKNOWN; 396 } 397 398 char *get_fdinfo(int fd, const char *key) 399 { 400 char path[PATH_MAX]; 401 char *line = NULL; 402 size_t line_n = 0; 403 ssize_t n; 404 FILE *fdi; 405 406 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); 407 408 fdi = fopen(path, "r"); 409 if (!fdi) 410 return NULL; 411 412 while ((n = getline(&line, &line_n, fdi)) > 0) { 413 char *value; 414 int len; 415 416 if (!strstr(line, key)) 417 continue; 418 419 fclose(fdi); 420 421 value = strchr(line, '\t'); 422 if (!value || !value[1]) { 423 free(line); 424 return NULL; 425 } 426 value++; 427 428 len = strlen(value); 429 memmove(line, value, len); 430 line[len - 1] = '\0'; 431 432 return line; 433 } 434 435 free(line); 436 fclose(fdi); 437 return NULL; 438 } 439 440 void print_data_json(uint8_t *data, size_t len) 441 { 442 unsigned int i; 443 444 jsonw_start_array(json_wtr); 445 for (i = 0; i < len; i++) 446 jsonw_printf(json_wtr, "%d", data[i]); 447 jsonw_end_array(json_wtr); 448 } 449 450 void print_hex_data_json(uint8_t *data, size_t len) 451 { 452 unsigned int i; 453 454 jsonw_start_array(json_wtr); 455 for (i = 0; i < len; i++) 456 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); 457 jsonw_end_array(json_wtr); 458 } 459 460 /* extra params for nftw cb */ 461 static struct hashmap *build_fn_table; 462 static enum bpf_obj_type build_fn_type; 463 464 static int do_build_table_cb(const char *fpath, const struct stat *sb, 465 int typeflag, struct FTW *ftwbuf) 466 { 467 struct bpf_prog_info pinned_info; 468 __u32 len = sizeof(pinned_info); 469 enum bpf_obj_type objtype; 470 int fd, err = 0; 471 char *path; 472 473 if (typeflag != FTW_F) 474 goto out_ret; 475 476 fd = open_obj_pinned(fpath, true); 477 if (fd < 0) 478 goto out_ret; 479 480 objtype = get_fd_type(fd); 481 if (objtype != build_fn_type) 482 goto out_close; 483 484 memset(&pinned_info, 0, sizeof(pinned_info)); 485 if (bpf_obj_get_info_by_fd(fd, &pinned_info, &len)) 486 goto out_close; 487 488 path = strdup(fpath); 489 if (!path) { 490 err = -1; 491 goto out_close; 492 } 493 494 err = hashmap__append(build_fn_table, u32_as_hash_field(pinned_info.id), path); 495 if (err) { 496 p_err("failed to append entry to hashmap for ID %u, path '%s': %s", 497 pinned_info.id, path, strerror(errno)); 498 goto out_close; 499 } 500 501 out_close: 502 close(fd); 503 out_ret: 504 return err; 505 } 506 507 int build_pinned_obj_table(struct hashmap *tab, 508 enum bpf_obj_type type) 509 { 510 struct mntent *mntent = NULL; 511 FILE *mntfile = NULL; 512 int flags = FTW_PHYS; 513 int nopenfd = 16; 514 int err = 0; 515 516 mntfile = setmntent("/proc/mounts", "r"); 517 if (!mntfile) 518 return -1; 519 520 build_fn_table = tab; 521 build_fn_type = type; 522 523 while ((mntent = getmntent(mntfile))) { 524 char *path = mntent->mnt_dir; 525 526 if (strncmp(mntent->mnt_type, "bpf", 3) != 0) 527 continue; 528 err = nftw(path, do_build_table_cb, nopenfd, flags); 529 if (err) 530 break; 531 } 532 fclose(mntfile); 533 return err; 534 } 535 536 void delete_pinned_obj_table(struct hashmap *map) 537 { 538 struct hashmap_entry *entry; 539 size_t bkt; 540 541 if (!map) 542 return; 543 544 hashmap__for_each_entry(map, entry, bkt) 545 free(entry->value); 546 547 hashmap__free(map); 548 } 549 550 unsigned int get_page_size(void) 551 { 552 static int result; 553 554 if (!result) 555 result = getpagesize(); 556 return result; 557 } 558 559 unsigned int get_possible_cpus(void) 560 { 561 int cpus = libbpf_num_possible_cpus(); 562 563 if (cpus < 0) { 564 p_err("Can't get # of possible cpus: %s", strerror(-cpus)); 565 exit(-1); 566 } 567 return cpus; 568 } 569 570 static char * 571 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) 572 { 573 struct stat st; 574 int err; 575 576 err = stat("/proc/self/ns/net", &st); 577 if (err) { 578 p_err("Can't stat /proc/self: %s", strerror(errno)); 579 return NULL; 580 } 581 582 if (st.st_dev != ns_dev || st.st_ino != ns_ino) 583 return NULL; 584 585 return if_indextoname(ifindex, buf); 586 } 587 588 static int read_sysfs_hex_int(char *path) 589 { 590 char vendor_id_buf[8]; 591 int len; 592 int fd; 593 594 fd = open(path, O_RDONLY); 595 if (fd < 0) { 596 p_err("Can't open %s: %s", path, strerror(errno)); 597 return -1; 598 } 599 600 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); 601 close(fd); 602 if (len < 0) { 603 p_err("Can't read %s: %s", path, strerror(errno)); 604 return -1; 605 } 606 if (len >= (int)sizeof(vendor_id_buf)) { 607 p_err("Value in %s too long", path); 608 return -1; 609 } 610 611 vendor_id_buf[len] = 0; 612 613 return strtol(vendor_id_buf, NULL, 0); 614 } 615 616 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) 617 { 618 char full_path[64]; 619 620 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", 621 devname, entry_name); 622 623 return read_sysfs_hex_int(full_path); 624 } 625 626 const char * 627 ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, 628 const char **opt) 629 { 630 char devname[IF_NAMESIZE]; 631 int vendor_id; 632 int device_id; 633 634 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { 635 p_err("Can't get net device name for ifindex %d: %s", ifindex, 636 strerror(errno)); 637 return NULL; 638 } 639 640 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); 641 if (vendor_id < 0) { 642 p_err("Can't get device vendor id for %s", devname); 643 return NULL; 644 } 645 646 switch (vendor_id) { 647 case 0x19ee: 648 device_id = read_sysfs_netdev_hex_int(devname, "device"); 649 if (device_id != 0x4000 && 650 device_id != 0x6000 && 651 device_id != 0x6003) 652 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); 653 *opt = "ctx4"; 654 return "NFP-6xxx"; 655 default: 656 p_err("Can't get bfd arch name for device vendor id 0x%04x", 657 vendor_id); 658 return NULL; 659 } 660 } 661 662 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 663 { 664 char name[IF_NAMESIZE]; 665 666 if (!ifindex) 667 return; 668 669 printf(" offloaded_to "); 670 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 671 printf("%s", name); 672 else 673 printf("ifindex %u ns_dev %llu ns_ino %llu", 674 ifindex, ns_dev, ns_inode); 675 } 676 677 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 678 { 679 char name[IF_NAMESIZE]; 680 681 if (!ifindex) 682 return; 683 684 jsonw_name(json_wtr, "dev"); 685 jsonw_start_object(json_wtr); 686 jsonw_uint_field(json_wtr, "ifindex", ifindex); 687 jsonw_uint_field(json_wtr, "ns_dev", ns_dev); 688 jsonw_uint_field(json_wtr, "ns_inode", ns_inode); 689 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 690 jsonw_string_field(json_wtr, "ifname", name); 691 jsonw_end_object(json_wtr); 692 } 693 694 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what) 695 { 696 char *endptr; 697 698 NEXT_ARGP(); 699 700 if (*val) { 701 p_err("%s already specified", what); 702 return -1; 703 } 704 705 *val = strtoul(**argv, &endptr, 0); 706 if (*endptr) { 707 p_err("can't parse %s as %s", **argv, what); 708 return -1; 709 } 710 NEXT_ARGP(); 711 712 return 0; 713 } 714 715 int __printf(2, 0) 716 print_all_levels(__maybe_unused enum libbpf_print_level level, 717 const char *format, va_list args) 718 { 719 return vfprintf(stderr, format, args); 720 } 721 722 static int prog_fd_by_nametag(void *nametag, int **fds, bool tag) 723 { 724 unsigned int id = 0; 725 int fd, nb_fds = 0; 726 void *tmp; 727 int err; 728 729 while (true) { 730 struct bpf_prog_info info = {}; 731 __u32 len = sizeof(info); 732 733 err = bpf_prog_get_next_id(id, &id); 734 if (err) { 735 if (errno != ENOENT) { 736 p_err("%s", strerror(errno)); 737 goto err_close_fds; 738 } 739 return nb_fds; 740 } 741 742 fd = bpf_prog_get_fd_by_id(id); 743 if (fd < 0) { 744 p_err("can't get prog by id (%u): %s", 745 id, strerror(errno)); 746 goto err_close_fds; 747 } 748 749 err = bpf_obj_get_info_by_fd(fd, &info, &len); 750 if (err) { 751 p_err("can't get prog info (%u): %s", 752 id, strerror(errno)); 753 goto err_close_fd; 754 } 755 756 if ((tag && memcmp(nametag, info.tag, BPF_TAG_SIZE)) || 757 (!tag && strncmp(nametag, info.name, BPF_OBJ_NAME_LEN))) { 758 close(fd); 759 continue; 760 } 761 762 if (nb_fds > 0) { 763 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int)); 764 if (!tmp) { 765 p_err("failed to realloc"); 766 goto err_close_fd; 767 } 768 *fds = tmp; 769 } 770 (*fds)[nb_fds++] = fd; 771 } 772 773 err_close_fd: 774 close(fd); 775 err_close_fds: 776 while (--nb_fds >= 0) 777 close((*fds)[nb_fds]); 778 return -1; 779 } 780 781 int prog_parse_fds(int *argc, char ***argv, int **fds) 782 { 783 if (is_prefix(**argv, "id")) { 784 unsigned int id; 785 char *endptr; 786 787 NEXT_ARGP(); 788 789 id = strtoul(**argv, &endptr, 0); 790 if (*endptr) { 791 p_err("can't parse %s as ID", **argv); 792 return -1; 793 } 794 NEXT_ARGP(); 795 796 (*fds)[0] = bpf_prog_get_fd_by_id(id); 797 if ((*fds)[0] < 0) { 798 p_err("get by id (%u): %s", id, strerror(errno)); 799 return -1; 800 } 801 return 1; 802 } else if (is_prefix(**argv, "tag")) { 803 unsigned char tag[BPF_TAG_SIZE]; 804 805 NEXT_ARGP(); 806 807 if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2, 808 tag + 3, tag + 4, tag + 5, tag + 6, tag + 7) 809 != BPF_TAG_SIZE) { 810 p_err("can't parse tag"); 811 return -1; 812 } 813 NEXT_ARGP(); 814 815 return prog_fd_by_nametag(tag, fds, true); 816 } else if (is_prefix(**argv, "name")) { 817 char *name; 818 819 NEXT_ARGP(); 820 821 name = **argv; 822 if (strlen(name) > BPF_OBJ_NAME_LEN - 1) { 823 p_err("can't parse name"); 824 return -1; 825 } 826 NEXT_ARGP(); 827 828 return prog_fd_by_nametag(name, fds, false); 829 } else if (is_prefix(**argv, "pinned")) { 830 char *path; 831 832 NEXT_ARGP(); 833 834 path = **argv; 835 NEXT_ARGP(); 836 837 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG); 838 if ((*fds)[0] < 0) 839 return -1; 840 return 1; 841 } 842 843 p_err("expected 'id', 'tag', 'name' or 'pinned', got: '%s'?", **argv); 844 return -1; 845 } 846 847 int prog_parse_fd(int *argc, char ***argv) 848 { 849 int *fds = NULL; 850 int nb_fds, fd; 851 852 fds = malloc(sizeof(int)); 853 if (!fds) { 854 p_err("mem alloc failed"); 855 return -1; 856 } 857 nb_fds = prog_parse_fds(argc, argv, &fds); 858 if (nb_fds != 1) { 859 if (nb_fds > 1) { 860 p_err("several programs match this handle"); 861 while (nb_fds--) 862 close(fds[nb_fds]); 863 } 864 fd = -1; 865 goto exit_free; 866 } 867 868 fd = fds[0]; 869 exit_free: 870 free(fds); 871 return fd; 872 } 873 874 static int map_fd_by_name(char *name, int **fds) 875 { 876 unsigned int id = 0; 877 int fd, nb_fds = 0; 878 void *tmp; 879 int err; 880 881 while (true) { 882 struct bpf_map_info info = {}; 883 __u32 len = sizeof(info); 884 885 err = bpf_map_get_next_id(id, &id); 886 if (err) { 887 if (errno != ENOENT) { 888 p_err("%s", strerror(errno)); 889 goto err_close_fds; 890 } 891 return nb_fds; 892 } 893 894 fd = bpf_map_get_fd_by_id(id); 895 if (fd < 0) { 896 p_err("can't get map by id (%u): %s", 897 id, strerror(errno)); 898 goto err_close_fds; 899 } 900 901 err = bpf_obj_get_info_by_fd(fd, &info, &len); 902 if (err) { 903 p_err("can't get map info (%u): %s", 904 id, strerror(errno)); 905 goto err_close_fd; 906 } 907 908 if (strncmp(name, info.name, BPF_OBJ_NAME_LEN)) { 909 close(fd); 910 continue; 911 } 912 913 if (nb_fds > 0) { 914 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int)); 915 if (!tmp) { 916 p_err("failed to realloc"); 917 goto err_close_fd; 918 } 919 *fds = tmp; 920 } 921 (*fds)[nb_fds++] = fd; 922 } 923 924 err_close_fd: 925 close(fd); 926 err_close_fds: 927 while (--nb_fds >= 0) 928 close((*fds)[nb_fds]); 929 return -1; 930 } 931 932 int map_parse_fds(int *argc, char ***argv, int **fds) 933 { 934 if (is_prefix(**argv, "id")) { 935 unsigned int id; 936 char *endptr; 937 938 NEXT_ARGP(); 939 940 id = strtoul(**argv, &endptr, 0); 941 if (*endptr) { 942 p_err("can't parse %s as ID", **argv); 943 return -1; 944 } 945 NEXT_ARGP(); 946 947 (*fds)[0] = bpf_map_get_fd_by_id(id); 948 if ((*fds)[0] < 0) { 949 p_err("get map by id (%u): %s", id, strerror(errno)); 950 return -1; 951 } 952 return 1; 953 } else if (is_prefix(**argv, "name")) { 954 char *name; 955 956 NEXT_ARGP(); 957 958 name = **argv; 959 if (strlen(name) > BPF_OBJ_NAME_LEN - 1) { 960 p_err("can't parse name"); 961 return -1; 962 } 963 NEXT_ARGP(); 964 965 return map_fd_by_name(name, fds); 966 } else if (is_prefix(**argv, "pinned")) { 967 char *path; 968 969 NEXT_ARGP(); 970 971 path = **argv; 972 NEXT_ARGP(); 973 974 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP); 975 if ((*fds)[0] < 0) 976 return -1; 977 return 1; 978 } 979 980 p_err("expected 'id', 'name' or 'pinned', got: '%s'?", **argv); 981 return -1; 982 } 983 984 int map_parse_fd(int *argc, char ***argv) 985 { 986 int *fds = NULL; 987 int nb_fds, fd; 988 989 fds = malloc(sizeof(int)); 990 if (!fds) { 991 p_err("mem alloc failed"); 992 return -1; 993 } 994 nb_fds = map_parse_fds(argc, argv, &fds); 995 if (nb_fds != 1) { 996 if (nb_fds > 1) { 997 p_err("several maps match this handle"); 998 while (nb_fds--) 999 close(fds[nb_fds]); 1000 } 1001 fd = -1; 1002 goto exit_free; 1003 } 1004 1005 fd = fds[0]; 1006 exit_free: 1007 free(fds); 1008 return fd; 1009 } 1010 1011 int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len) 1012 { 1013 int err; 1014 int fd; 1015 1016 fd = map_parse_fd(argc, argv); 1017 if (fd < 0) 1018 return -1; 1019 1020 err = bpf_obj_get_info_by_fd(fd, info, info_len); 1021 if (err) { 1022 p_err("can't get map info: %s", strerror(errno)); 1023 close(fd); 1024 return err; 1025 } 1026 1027 return fd; 1028 } 1029 1030 size_t hash_fn_for_key_as_id(const void *key, void *ctx) 1031 { 1032 return (size_t)key; 1033 } 1034 1035 bool equal_fn_for_key_as_id(const void *k1, const void *k2, void *ctx) 1036 { 1037 return k1 == k2; 1038 } 1039 1040 const char *bpf_attach_type_input_str(enum bpf_attach_type t) 1041 { 1042 switch (t) { 1043 case BPF_CGROUP_INET_INGRESS: return "ingress"; 1044 case BPF_CGROUP_INET_EGRESS: return "egress"; 1045 case BPF_CGROUP_INET_SOCK_CREATE: return "sock_create"; 1046 case BPF_CGROUP_INET_SOCK_RELEASE: return "sock_release"; 1047 case BPF_CGROUP_SOCK_OPS: return "sock_ops"; 1048 case BPF_CGROUP_DEVICE: return "device"; 1049 case BPF_CGROUP_INET4_BIND: return "bind4"; 1050 case BPF_CGROUP_INET6_BIND: return "bind6"; 1051 case BPF_CGROUP_INET4_CONNECT: return "connect4"; 1052 case BPF_CGROUP_INET6_CONNECT: return "connect6"; 1053 case BPF_CGROUP_INET4_POST_BIND: return "post_bind4"; 1054 case BPF_CGROUP_INET6_POST_BIND: return "post_bind6"; 1055 case BPF_CGROUP_INET4_GETPEERNAME: return "getpeername4"; 1056 case BPF_CGROUP_INET6_GETPEERNAME: return "getpeername6"; 1057 case BPF_CGROUP_INET4_GETSOCKNAME: return "getsockname4"; 1058 case BPF_CGROUP_INET6_GETSOCKNAME: return "getsockname6"; 1059 case BPF_CGROUP_UDP4_SENDMSG: return "sendmsg4"; 1060 case BPF_CGROUP_UDP6_SENDMSG: return "sendmsg6"; 1061 case BPF_CGROUP_SYSCTL: return "sysctl"; 1062 case BPF_CGROUP_UDP4_RECVMSG: return "recvmsg4"; 1063 case BPF_CGROUP_UDP6_RECVMSG: return "recvmsg6"; 1064 case BPF_CGROUP_GETSOCKOPT: return "getsockopt"; 1065 case BPF_CGROUP_SETSOCKOPT: return "setsockopt"; 1066 case BPF_TRACE_RAW_TP: return "raw_tp"; 1067 case BPF_TRACE_FENTRY: return "fentry"; 1068 case BPF_TRACE_FEXIT: return "fexit"; 1069 case BPF_MODIFY_RETURN: return "mod_ret"; 1070 case BPF_SK_REUSEPORT_SELECT: return "sk_skb_reuseport_select"; 1071 case BPF_SK_REUSEPORT_SELECT_OR_MIGRATE: return "sk_skb_reuseport_select_or_migrate"; 1072 default: return libbpf_bpf_attach_type_str(t); 1073 } 1074 } 1075