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(const 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 create_and_mount_bpffs_dir(const char *dir_name) 248 { 249 char err_str[ERR_MAX_LEN]; 250 bool dir_exists; 251 int err = 0; 252 253 if (is_bpffs(dir_name)) 254 return err; 255 256 dir_exists = access(dir_name, F_OK) == 0; 257 258 if (!dir_exists) { 259 char *temp_name; 260 char *parent_name; 261 262 temp_name = strdup(dir_name); 263 if (!temp_name) { 264 p_err("mem alloc failed"); 265 return -1; 266 } 267 268 parent_name = dirname(temp_name); 269 270 if (is_bpffs(parent_name)) { 271 /* nothing to do if already mounted */ 272 free(temp_name); 273 return err; 274 } 275 276 if (access(parent_name, F_OK) == -1) { 277 p_err("can't create dir '%s' to pin BPF object: parent dir '%s' doesn't exist", 278 dir_name, parent_name); 279 free(temp_name); 280 return -1; 281 } 282 283 free(temp_name); 284 } 285 286 if (block_mount) { 287 p_err("no BPF file system found, not mounting it due to --nomount option"); 288 return -1; 289 } 290 291 if (!dir_exists) { 292 err = mkdir(dir_name, S_IRWXU); 293 if (err) { 294 p_err("failed to create dir '%s': %s", dir_name, strerror(errno)); 295 return err; 296 } 297 } 298 299 err = mnt_fs(dir_name, "bpf", err_str, ERR_MAX_LEN); 300 if (err) { 301 err_str[ERR_MAX_LEN - 1] = '\0'; 302 p_err("can't mount BPF file system on given dir '%s': %s", 303 dir_name, err_str); 304 305 if (!dir_exists) 306 rmdir(dir_name); 307 } 308 309 return err; 310 } 311 312 int mount_bpffs_for_file(const char *file_name) 313 { 314 char err_str[ERR_MAX_LEN]; 315 char *temp_name; 316 char *dir; 317 int err = 0; 318 319 if (access(file_name, F_OK) != -1) { 320 p_err("can't pin BPF object: path '%s' already exists", file_name); 321 return -1; 322 } 323 324 temp_name = strdup(file_name); 325 if (!temp_name) { 326 p_err("mem alloc failed"); 327 return -1; 328 } 329 330 dir = dirname(temp_name); 331 332 if (is_bpffs(dir)) 333 /* nothing to do if already mounted */ 334 goto out_free; 335 336 if (access(dir, F_OK) == -1) { 337 p_err("can't pin BPF object: dir '%s' doesn't exist", dir); 338 err = -1; 339 goto out_free; 340 } 341 342 if (block_mount) { 343 p_err("no BPF file system found, not mounting it due to --nomount option"); 344 err = -1; 345 goto out_free; 346 } 347 348 err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN); 349 if (err) { 350 err_str[ERR_MAX_LEN - 1] = '\0'; 351 p_err("can't mount BPF file system to pin the object '%s': %s", 352 file_name, err_str); 353 } 354 355 out_free: 356 free(temp_name); 357 return err; 358 } 359 360 int do_pin_fd(int fd, const char *name) 361 { 362 int err; 363 364 err = mount_bpffs_for_file(name); 365 if (err) 366 return err; 367 368 err = bpf_obj_pin(fd, name); 369 if (err) 370 p_err("can't pin the object (%s): %s", name, strerror(errno)); 371 372 return err; 373 } 374 375 int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***)) 376 { 377 int err; 378 int fd; 379 380 if (!REQ_ARGS(3)) 381 return -EINVAL; 382 383 fd = get_fd(&argc, &argv); 384 if (fd < 0) 385 return fd; 386 387 err = do_pin_fd(fd, *argv); 388 389 close(fd); 390 return err; 391 } 392 393 const char *get_fd_type_name(enum bpf_obj_type type) 394 { 395 static const char * const names[] = { 396 [BPF_OBJ_UNKNOWN] = "unknown", 397 [BPF_OBJ_PROG] = "prog", 398 [BPF_OBJ_MAP] = "map", 399 [BPF_OBJ_LINK] = "link", 400 }; 401 402 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) 403 return names[BPF_OBJ_UNKNOWN]; 404 405 return names[type]; 406 } 407 408 void get_prog_full_name(const struct bpf_prog_info *prog_info, int prog_fd, 409 char *name_buff, size_t buff_len) 410 { 411 const char *prog_name = prog_info->name; 412 const struct btf_type *func_type; 413 const struct bpf_func_info finfo = {}; 414 struct bpf_prog_info info = {}; 415 __u32 info_len = sizeof(info); 416 struct btf *prog_btf = NULL; 417 418 if (buff_len <= BPF_OBJ_NAME_LEN || 419 strlen(prog_info->name) < BPF_OBJ_NAME_LEN - 1) 420 goto copy_name; 421 422 if (!prog_info->btf_id || prog_info->nr_func_info == 0) 423 goto copy_name; 424 425 info.nr_func_info = 1; 426 info.func_info_rec_size = prog_info->func_info_rec_size; 427 if (info.func_info_rec_size > sizeof(finfo)) 428 info.func_info_rec_size = sizeof(finfo); 429 info.func_info = ptr_to_u64(&finfo); 430 431 if (bpf_prog_get_info_by_fd(prog_fd, &info, &info_len)) 432 goto copy_name; 433 434 prog_btf = btf__load_from_kernel_by_id(info.btf_id); 435 if (!prog_btf) 436 goto copy_name; 437 438 func_type = btf__type_by_id(prog_btf, finfo.type_id); 439 if (!func_type || !btf_is_func(func_type)) 440 goto copy_name; 441 442 prog_name = btf__name_by_offset(prog_btf, func_type->name_off); 443 444 copy_name: 445 snprintf(name_buff, buff_len, "%s", prog_name); 446 447 if (prog_btf) 448 btf__free(prog_btf); 449 } 450 451 int get_fd_type(int fd) 452 { 453 char path[PATH_MAX]; 454 char buf[512]; 455 ssize_t n; 456 457 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); 458 459 n = readlink(path, buf, sizeof(buf)); 460 if (n < 0) { 461 p_err("can't read link type: %s", strerror(errno)); 462 return -1; 463 } 464 if (n == sizeof(path)) { 465 p_err("can't read link type: path too long!"); 466 return -1; 467 } 468 469 if (strstr(buf, "bpf-map")) 470 return BPF_OBJ_MAP; 471 else if (strstr(buf, "bpf-prog")) 472 return BPF_OBJ_PROG; 473 else if (strstr(buf, "bpf-link")) 474 return BPF_OBJ_LINK; 475 476 return BPF_OBJ_UNKNOWN; 477 } 478 479 char *get_fdinfo(int fd, const char *key) 480 { 481 char path[PATH_MAX]; 482 char *line = NULL; 483 size_t line_n = 0; 484 ssize_t n; 485 FILE *fdi; 486 487 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); 488 489 fdi = fopen(path, "r"); 490 if (!fdi) 491 return NULL; 492 493 while ((n = getline(&line, &line_n, fdi)) > 0) { 494 char *value; 495 int len; 496 497 if (!strstr(line, key)) 498 continue; 499 500 fclose(fdi); 501 502 value = strchr(line, '\t'); 503 if (!value || !value[1]) { 504 free(line); 505 return NULL; 506 } 507 value++; 508 509 len = strlen(value); 510 memmove(line, value, len); 511 line[len - 1] = '\0'; 512 513 return line; 514 } 515 516 free(line); 517 fclose(fdi); 518 return NULL; 519 } 520 521 void print_data_json(uint8_t *data, size_t len) 522 { 523 unsigned int i; 524 525 jsonw_start_array(json_wtr); 526 for (i = 0; i < len; i++) 527 jsonw_printf(json_wtr, "%d", data[i]); 528 jsonw_end_array(json_wtr); 529 } 530 531 void print_hex_data_json(uint8_t *data, size_t len) 532 { 533 unsigned int i; 534 535 jsonw_start_array(json_wtr); 536 for (i = 0; i < len; i++) 537 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); 538 jsonw_end_array(json_wtr); 539 } 540 541 /* extra params for nftw cb */ 542 static struct hashmap *build_fn_table; 543 static enum bpf_obj_type build_fn_type; 544 545 static int do_build_table_cb(const char *fpath, const struct stat *sb, 546 int typeflag, struct FTW *ftwbuf) 547 { 548 struct bpf_prog_info pinned_info; 549 __u32 len = sizeof(pinned_info); 550 enum bpf_obj_type objtype; 551 int fd, err = 0; 552 char *path; 553 554 if (typeflag != FTW_F) 555 goto out_ret; 556 557 fd = open_obj_pinned(fpath, true); 558 if (fd < 0) 559 goto out_ret; 560 561 objtype = get_fd_type(fd); 562 if (objtype != build_fn_type) 563 goto out_close; 564 565 memset(&pinned_info, 0, sizeof(pinned_info)); 566 if (bpf_prog_get_info_by_fd(fd, &pinned_info, &len)) 567 goto out_close; 568 569 path = strdup(fpath); 570 if (!path) { 571 err = -1; 572 goto out_close; 573 } 574 575 err = hashmap__append(build_fn_table, pinned_info.id, path); 576 if (err) { 577 p_err("failed to append entry to hashmap for ID %u, path '%s': %s", 578 pinned_info.id, path, strerror(errno)); 579 free(path); 580 goto out_close; 581 } 582 583 out_close: 584 close(fd); 585 out_ret: 586 return err; 587 } 588 589 int build_pinned_obj_table(struct hashmap *tab, 590 enum bpf_obj_type type) 591 { 592 struct mntent *mntent = NULL; 593 FILE *mntfile = NULL; 594 int flags = FTW_PHYS; 595 int nopenfd = 16; 596 int err = 0; 597 598 mntfile = setmntent("/proc/mounts", "r"); 599 if (!mntfile) 600 return -1; 601 602 build_fn_table = tab; 603 build_fn_type = type; 604 605 while ((mntent = getmntent(mntfile))) { 606 char *path = mntent->mnt_dir; 607 608 if (strncmp(mntent->mnt_type, "bpf", 3) != 0) 609 continue; 610 err = nftw(path, do_build_table_cb, nopenfd, flags); 611 if (err) 612 break; 613 } 614 fclose(mntfile); 615 return err; 616 } 617 618 void delete_pinned_obj_table(struct hashmap *map) 619 { 620 struct hashmap_entry *entry; 621 size_t bkt; 622 623 if (!map) 624 return; 625 626 hashmap__for_each_entry(map, entry, bkt) 627 free(entry->pvalue); 628 629 hashmap__free(map); 630 } 631 632 unsigned int get_page_size(void) 633 { 634 static int result; 635 636 if (!result) 637 result = getpagesize(); 638 return result; 639 } 640 641 unsigned int get_possible_cpus(void) 642 { 643 int cpus = libbpf_num_possible_cpus(); 644 645 if (cpus < 0) { 646 p_err("Can't get # of possible cpus: %s", strerror(-cpus)); 647 exit(-1); 648 } 649 return cpus; 650 } 651 652 static char * 653 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) 654 { 655 struct stat st; 656 int err; 657 658 err = stat("/proc/self/ns/net", &st); 659 if (err) { 660 p_err("Can't stat /proc/self: %s", strerror(errno)); 661 return NULL; 662 } 663 664 if (st.st_dev != ns_dev || st.st_ino != ns_ino) 665 return NULL; 666 667 return if_indextoname(ifindex, buf); 668 } 669 670 static int read_sysfs_hex_int(char *path) 671 { 672 char vendor_id_buf[8]; 673 int len; 674 int fd; 675 676 fd = open(path, O_RDONLY); 677 if (fd < 0) { 678 p_err("Can't open %s: %s", path, strerror(errno)); 679 return -1; 680 } 681 682 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); 683 close(fd); 684 if (len < 0) { 685 p_err("Can't read %s: %s", path, strerror(errno)); 686 return -1; 687 } 688 if (len >= (int)sizeof(vendor_id_buf)) { 689 p_err("Value in %s too long", path); 690 return -1; 691 } 692 693 vendor_id_buf[len] = 0; 694 695 return strtol(vendor_id_buf, NULL, 0); 696 } 697 698 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) 699 { 700 char full_path[64]; 701 702 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", 703 devname, entry_name); 704 705 return read_sysfs_hex_int(full_path); 706 } 707 708 const char * 709 ifindex_to_arch(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, const char **opt) 710 { 711 __maybe_unused int device_id; 712 char devname[IF_NAMESIZE]; 713 int vendor_id; 714 715 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { 716 p_err("Can't get net device name for ifindex %d: %s", ifindex, 717 strerror(errno)); 718 return NULL; 719 } 720 721 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); 722 if (vendor_id < 0) { 723 p_err("Can't get device vendor id for %s", devname); 724 return NULL; 725 } 726 727 switch (vendor_id) { 728 #ifdef HAVE_LIBBFD_SUPPORT 729 case 0x19ee: 730 device_id = read_sysfs_netdev_hex_int(devname, "device"); 731 if (device_id != 0x4000 && 732 device_id != 0x6000 && 733 device_id != 0x6003) 734 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); 735 *opt = "ctx4"; 736 return "NFP-6xxx"; 737 #endif /* HAVE_LIBBFD_SUPPORT */ 738 /* No NFP support in LLVM, we have no valid triple to return. */ 739 default: 740 p_err("Can't get arch name for device vendor id 0x%04x", 741 vendor_id); 742 return NULL; 743 } 744 } 745 746 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 747 { 748 char name[IF_NAMESIZE]; 749 750 if (!ifindex) 751 return; 752 753 printf(" offloaded_to "); 754 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 755 printf("%s", name); 756 else 757 printf("ifindex %u ns_dev %llu ns_ino %llu", 758 ifindex, ns_dev, ns_inode); 759 } 760 761 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 762 { 763 char name[IF_NAMESIZE]; 764 765 if (!ifindex) 766 return; 767 768 jsonw_name(json_wtr, "dev"); 769 jsonw_start_object(json_wtr); 770 jsonw_uint_field(json_wtr, "ifindex", ifindex); 771 jsonw_uint_field(json_wtr, "ns_dev", ns_dev); 772 jsonw_uint_field(json_wtr, "ns_inode", ns_inode); 773 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 774 jsonw_string_field(json_wtr, "ifname", name); 775 jsonw_end_object(json_wtr); 776 } 777 778 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what) 779 { 780 char *endptr; 781 782 NEXT_ARGP(); 783 784 if (*val) { 785 p_err("%s already specified", what); 786 return -1; 787 } 788 789 *val = strtoul(**argv, &endptr, 0); 790 if (*endptr) { 791 p_err("can't parse %s as %s", **argv, what); 792 return -1; 793 } 794 NEXT_ARGP(); 795 796 return 0; 797 } 798 799 int __printf(2, 0) 800 print_all_levels(__maybe_unused enum libbpf_print_level level, 801 const char *format, va_list args) 802 { 803 return vfprintf(stderr, format, args); 804 } 805 806 static int prog_fd_by_nametag(void *nametag, int **fds, bool tag) 807 { 808 char prog_name[MAX_PROG_FULL_NAME]; 809 unsigned int id = 0; 810 int fd, nb_fds = 0; 811 void *tmp; 812 int err; 813 814 while (true) { 815 struct bpf_prog_info info = {}; 816 __u32 len = sizeof(info); 817 818 err = bpf_prog_get_next_id(id, &id); 819 if (err) { 820 if (errno != ENOENT) { 821 p_err("%s", strerror(errno)); 822 goto err_close_fds; 823 } 824 return nb_fds; 825 } 826 827 fd = bpf_prog_get_fd_by_id(id); 828 if (fd < 0) { 829 p_err("can't get prog by id (%u): %s", 830 id, strerror(errno)); 831 goto err_close_fds; 832 } 833 834 err = bpf_prog_get_info_by_fd(fd, &info, &len); 835 if (err) { 836 p_err("can't get prog info (%u): %s", 837 id, strerror(errno)); 838 goto err_close_fd; 839 } 840 841 if (tag && memcmp(nametag, info.tag, BPF_TAG_SIZE)) { 842 close(fd); 843 continue; 844 } 845 846 if (!tag) { 847 get_prog_full_name(&info, fd, prog_name, 848 sizeof(prog_name)); 849 if (strncmp(nametag, prog_name, sizeof(prog_name))) { 850 close(fd); 851 continue; 852 } 853 } 854 855 if (nb_fds > 0) { 856 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int)); 857 if (!tmp) { 858 p_err("failed to realloc"); 859 goto err_close_fd; 860 } 861 *fds = tmp; 862 } 863 (*fds)[nb_fds++] = fd; 864 } 865 866 err_close_fd: 867 close(fd); 868 err_close_fds: 869 while (--nb_fds >= 0) 870 close((*fds)[nb_fds]); 871 return -1; 872 } 873 874 int prog_parse_fds(int *argc, char ***argv, int **fds) 875 { 876 if (is_prefix(**argv, "id")) { 877 unsigned int id; 878 char *endptr; 879 880 NEXT_ARGP(); 881 882 id = strtoul(**argv, &endptr, 0); 883 if (*endptr) { 884 p_err("can't parse %s as ID", **argv); 885 return -1; 886 } 887 NEXT_ARGP(); 888 889 (*fds)[0] = bpf_prog_get_fd_by_id(id); 890 if ((*fds)[0] < 0) { 891 p_err("get by id (%u): %s", id, strerror(errno)); 892 return -1; 893 } 894 return 1; 895 } else if (is_prefix(**argv, "tag")) { 896 unsigned char tag[BPF_TAG_SIZE]; 897 898 NEXT_ARGP(); 899 900 if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2, 901 tag + 3, tag + 4, tag + 5, tag + 6, tag + 7) 902 != BPF_TAG_SIZE) { 903 p_err("can't parse tag"); 904 return -1; 905 } 906 NEXT_ARGP(); 907 908 return prog_fd_by_nametag(tag, fds, true); 909 } else if (is_prefix(**argv, "name")) { 910 char *name; 911 912 NEXT_ARGP(); 913 914 name = **argv; 915 if (strlen(name) > MAX_PROG_FULL_NAME - 1) { 916 p_err("can't parse name"); 917 return -1; 918 } 919 NEXT_ARGP(); 920 921 return prog_fd_by_nametag(name, fds, false); 922 } else if (is_prefix(**argv, "pinned")) { 923 char *path; 924 925 NEXT_ARGP(); 926 927 path = **argv; 928 NEXT_ARGP(); 929 930 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG); 931 if ((*fds)[0] < 0) 932 return -1; 933 return 1; 934 } 935 936 p_err("expected 'id', 'tag', 'name' or 'pinned', got: '%s'?", **argv); 937 return -1; 938 } 939 940 int prog_parse_fd(int *argc, char ***argv) 941 { 942 int *fds = NULL; 943 int nb_fds, fd; 944 945 fds = malloc(sizeof(int)); 946 if (!fds) { 947 p_err("mem alloc failed"); 948 return -1; 949 } 950 nb_fds = prog_parse_fds(argc, argv, &fds); 951 if (nb_fds != 1) { 952 if (nb_fds > 1) { 953 p_err("several programs match this handle"); 954 while (nb_fds--) 955 close(fds[nb_fds]); 956 } 957 fd = -1; 958 goto exit_free; 959 } 960 961 fd = fds[0]; 962 exit_free: 963 free(fds); 964 return fd; 965 } 966 967 static int map_fd_by_name(char *name, int **fds) 968 { 969 unsigned int id = 0; 970 int fd, nb_fds = 0; 971 void *tmp; 972 int err; 973 974 while (true) { 975 struct bpf_map_info info = {}; 976 __u32 len = sizeof(info); 977 978 err = bpf_map_get_next_id(id, &id); 979 if (err) { 980 if (errno != ENOENT) { 981 p_err("%s", strerror(errno)); 982 goto err_close_fds; 983 } 984 return nb_fds; 985 } 986 987 fd = bpf_map_get_fd_by_id(id); 988 if (fd < 0) { 989 p_err("can't get map by id (%u): %s", 990 id, strerror(errno)); 991 goto err_close_fds; 992 } 993 994 err = bpf_map_get_info_by_fd(fd, &info, &len); 995 if (err) { 996 p_err("can't get map info (%u): %s", 997 id, strerror(errno)); 998 goto err_close_fd; 999 } 1000 1001 if (strncmp(name, info.name, BPF_OBJ_NAME_LEN)) { 1002 close(fd); 1003 continue; 1004 } 1005 1006 if (nb_fds > 0) { 1007 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int)); 1008 if (!tmp) { 1009 p_err("failed to realloc"); 1010 goto err_close_fd; 1011 } 1012 *fds = tmp; 1013 } 1014 (*fds)[nb_fds++] = fd; 1015 } 1016 1017 err_close_fd: 1018 close(fd); 1019 err_close_fds: 1020 while (--nb_fds >= 0) 1021 close((*fds)[nb_fds]); 1022 return -1; 1023 } 1024 1025 int map_parse_fds(int *argc, char ***argv, int **fds) 1026 { 1027 if (is_prefix(**argv, "id")) { 1028 unsigned int id; 1029 char *endptr; 1030 1031 NEXT_ARGP(); 1032 1033 id = strtoul(**argv, &endptr, 0); 1034 if (*endptr) { 1035 p_err("can't parse %s as ID", **argv); 1036 return -1; 1037 } 1038 NEXT_ARGP(); 1039 1040 (*fds)[0] = bpf_map_get_fd_by_id(id); 1041 if ((*fds)[0] < 0) { 1042 p_err("get map by id (%u): %s", id, strerror(errno)); 1043 return -1; 1044 } 1045 return 1; 1046 } else if (is_prefix(**argv, "name")) { 1047 char *name; 1048 1049 NEXT_ARGP(); 1050 1051 name = **argv; 1052 if (strlen(name) > BPF_OBJ_NAME_LEN - 1) { 1053 p_err("can't parse name"); 1054 return -1; 1055 } 1056 NEXT_ARGP(); 1057 1058 return map_fd_by_name(name, fds); 1059 } else if (is_prefix(**argv, "pinned")) { 1060 char *path; 1061 1062 NEXT_ARGP(); 1063 1064 path = **argv; 1065 NEXT_ARGP(); 1066 1067 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP); 1068 if ((*fds)[0] < 0) 1069 return -1; 1070 return 1; 1071 } 1072 1073 p_err("expected 'id', 'name' or 'pinned', got: '%s'?", **argv); 1074 return -1; 1075 } 1076 1077 int map_parse_fd(int *argc, char ***argv) 1078 { 1079 int *fds = NULL; 1080 int nb_fds, fd; 1081 1082 fds = malloc(sizeof(int)); 1083 if (!fds) { 1084 p_err("mem alloc failed"); 1085 return -1; 1086 } 1087 nb_fds = map_parse_fds(argc, argv, &fds); 1088 if (nb_fds != 1) { 1089 if (nb_fds > 1) { 1090 p_err("several maps match this handle"); 1091 while (nb_fds--) 1092 close(fds[nb_fds]); 1093 } 1094 fd = -1; 1095 goto exit_free; 1096 } 1097 1098 fd = fds[0]; 1099 exit_free: 1100 free(fds); 1101 return fd; 1102 } 1103 1104 int map_parse_fd_and_info(int *argc, char ***argv, struct bpf_map_info *info, 1105 __u32 *info_len) 1106 { 1107 int err; 1108 int fd; 1109 1110 fd = map_parse_fd(argc, argv); 1111 if (fd < 0) 1112 return -1; 1113 1114 err = bpf_map_get_info_by_fd(fd, info, info_len); 1115 if (err) { 1116 p_err("can't get map info: %s", strerror(errno)); 1117 close(fd); 1118 return err; 1119 } 1120 1121 return fd; 1122 } 1123 1124 size_t hash_fn_for_key_as_id(long key, void *ctx) 1125 { 1126 return key; 1127 } 1128 1129 bool equal_fn_for_key_as_id(long k1, long k2, void *ctx) 1130 { 1131 return k1 == k2; 1132 } 1133 1134 const char *bpf_attach_type_input_str(enum bpf_attach_type t) 1135 { 1136 switch (t) { 1137 case BPF_CGROUP_INET_INGRESS: return "ingress"; 1138 case BPF_CGROUP_INET_EGRESS: return "egress"; 1139 case BPF_CGROUP_INET_SOCK_CREATE: return "sock_create"; 1140 case BPF_CGROUP_INET_SOCK_RELEASE: return "sock_release"; 1141 case BPF_CGROUP_SOCK_OPS: return "sock_ops"; 1142 case BPF_CGROUP_DEVICE: return "device"; 1143 case BPF_CGROUP_INET4_BIND: return "bind4"; 1144 case BPF_CGROUP_INET6_BIND: return "bind6"; 1145 case BPF_CGROUP_INET4_CONNECT: return "connect4"; 1146 case BPF_CGROUP_INET6_CONNECT: return "connect6"; 1147 case BPF_CGROUP_INET4_POST_BIND: return "post_bind4"; 1148 case BPF_CGROUP_INET6_POST_BIND: return "post_bind6"; 1149 case BPF_CGROUP_INET4_GETPEERNAME: return "getpeername4"; 1150 case BPF_CGROUP_INET6_GETPEERNAME: return "getpeername6"; 1151 case BPF_CGROUP_INET4_GETSOCKNAME: return "getsockname4"; 1152 case BPF_CGROUP_INET6_GETSOCKNAME: return "getsockname6"; 1153 case BPF_CGROUP_UDP4_SENDMSG: return "sendmsg4"; 1154 case BPF_CGROUP_UDP6_SENDMSG: return "sendmsg6"; 1155 case BPF_CGROUP_SYSCTL: return "sysctl"; 1156 case BPF_CGROUP_UDP4_RECVMSG: return "recvmsg4"; 1157 case BPF_CGROUP_UDP6_RECVMSG: return "recvmsg6"; 1158 case BPF_CGROUP_GETSOCKOPT: return "getsockopt"; 1159 case BPF_CGROUP_SETSOCKOPT: return "setsockopt"; 1160 case BPF_TRACE_RAW_TP: return "raw_tp"; 1161 case BPF_TRACE_FENTRY: return "fentry"; 1162 case BPF_TRACE_FEXIT: return "fexit"; 1163 case BPF_MODIFY_RETURN: return "mod_ret"; 1164 case BPF_SK_REUSEPORT_SELECT: return "sk_skb_reuseport_select"; 1165 case BPF_SK_REUSEPORT_SELECT_OR_MIGRATE: return "sk_skb_reuseport_select_or_migrate"; 1166 default: return libbpf_bpf_attach_type_str(t); 1167 } 1168 } 1169 1170 int pathname_concat(char *buf, int buf_sz, const char *path, 1171 const char *name) 1172 { 1173 int len; 1174 1175 len = snprintf(buf, buf_sz, "%s/%s", path, name); 1176 if (len < 0) 1177 return -EINVAL; 1178 if (len >= buf_sz) 1179 return -ENAMETOOLONG; 1180 1181 return 0; 1182 } 1183