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