1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
4 * Common eBPF ELF object loading operations.
6 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
7 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
8 * Copyright (C) 2015 Huawei Inc.
9 * Copyright (C) 2017 Nicira, Inc.
10 * Copyright (C) 2019 Isovalent, Inc.
25 #include <asm/unistd.h>
26 #include <linux/err.h>
27 #include <linux/kernel.h>
28 #include <linux/bpf.h>
29 #include <linux/btf.h>
30 #include <linux/filter.h>
31 #include <linux/list.h>
32 #include <linux/limits.h>
33 #include <linux/perf_event.h>
34 #include <linux/ring_buffer.h>
36 #include <sys/types.h>
38 #include <tools/libc_compat.h>
45 #include "str_error.h"
46 #include "libbpf_internal.h"
53 #define BPF_FS_MAGIC 0xcafe4a11
56 /* vsprintf() in __base_pr() uses nonliteral format string. It may break
57 * compilation if user enables corresponding warning. Disable it explicitly.
59 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
61 #define __printf(a, b) __attribute__((format(printf, a, b)))
63 static int __base_pr(enum libbpf_print_level level, const char *format,
66 if (level == LIBBPF_DEBUG)
69 return vfprintf(stderr, format, args);
72 static libbpf_print_fn_t __libbpf_pr = __base_pr;
74 void libbpf_set_print(libbpf_print_fn_t fn)
80 void libbpf_print(enum libbpf_print_level level, const char *format, ...)
87 va_start(args, format);
88 __libbpf_pr(level, format, args);
92 #define STRERR_BUFSIZE 128
94 #define CHECK_ERR(action, err, out) do { \
101 /* Copied from tools/perf/util/util.h */
103 # define zfree(ptr) ({ free(*ptr); *ptr = NULL; })
107 # define zclose(fd) ({ \
110 ___err = close((fd)); \
115 #ifdef HAVE_LIBELF_MMAP_SUPPORT
116 # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ_MMAP
118 # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ
121 static inline __u64 ptr_to_u64(const void *ptr)
123 return (__u64) (unsigned long) ptr;
126 struct bpf_capabilities {
127 /* v4.14: kernel support for program & map names. */
129 /* v5.2: kernel support for global data sections. */
131 /* BTF_KIND_FUNC and BTF_KIND_FUNC_PROTO support */
133 /* BTF_KIND_VAR and BTF_KIND_DATASEC support */
138 * bpf_prog should be a better name but it has been used in
142 /* Index in elf obj file, for relocation use. */
147 /* section_name with / replaced by _; makes recursive pinning
148 * in bpf_object__pin_programs easier
151 struct bpf_insn *insns;
152 size_t insns_cnt, main_prog_cnt;
153 enum bpf_prog_type type;
174 bpf_program_prep_t preprocessor;
176 struct bpf_object *obj;
178 bpf_program_clear_priv_t clear_priv;
180 enum bpf_attach_type expected_attach_type;
183 __u32 func_info_rec_size;
186 struct bpf_capabilities *caps;
189 __u32 line_info_rec_size;
193 enum libbpf_map_type {
200 static const char * const libbpf_type_to_btf_name[] = {
201 [LIBBPF_MAP_DATA] = ".data",
202 [LIBBPF_MAP_BSS] = ".bss",
203 [LIBBPF_MAP_RODATA] = ".rodata",
212 struct bpf_map_def def;
213 __u32 btf_key_type_id;
214 __u32 btf_value_type_id;
216 bpf_map_clear_priv_t clear_priv;
217 enum libbpf_map_type libbpf_type;
225 static LIST_HEAD(bpf_objects_list);
228 char name[BPF_OBJ_NAME_LEN];
232 struct bpf_program *programs;
234 struct bpf_map *maps;
236 struct bpf_secdata sections;
239 bool has_pseudo_calls;
242 * Information when doing elf related work. Only valid if fd
268 * All loaded bpf_object is linked in a list, which is
269 * hidden to caller. bpf_objects__<func> handlers deal with
272 struct list_head list;
275 struct btf_ext *btf_ext;
278 bpf_object_clear_priv_t clear_priv;
280 struct bpf_capabilities caps;
284 #define obj_elf_valid(o) ((o)->efile.elf)
286 void bpf_program__unload(struct bpf_program *prog)
294 * If the object is opened but the program was never loaded,
295 * it is possible that prog->instances.nr == -1.
297 if (prog->instances.nr > 0) {
298 for (i = 0; i < prog->instances.nr; i++)
299 zclose(prog->instances.fds[i]);
300 } else if (prog->instances.nr != -1) {
301 pr_warning("Internal error: instances.nr is %d\n",
305 prog->instances.nr = -1;
306 zfree(&prog->instances.fds);
308 zclose(prog->btf_fd);
309 zfree(&prog->func_info);
310 zfree(&prog->line_info);
313 static void bpf_program__exit(struct bpf_program *prog)
318 if (prog->clear_priv)
319 prog->clear_priv(prog, prog->priv);
322 prog->clear_priv = NULL;
324 bpf_program__unload(prog);
326 zfree(&prog->section_name);
327 zfree(&prog->pin_name);
329 zfree(&prog->reloc_desc);
336 static char *__bpf_program__pin_name(struct bpf_program *prog)
340 name = p = strdup(prog->section_name);
341 while ((p = strchr(p, '/')))
348 bpf_program__init(void *data, size_t size, char *section_name, int idx,
349 struct bpf_program *prog)
351 if (size < sizeof(struct bpf_insn)) {
352 pr_warning("corrupted section '%s'\n", section_name);
356 memset(prog, 0, sizeof(*prog));
358 prog->section_name = strdup(section_name);
359 if (!prog->section_name) {
360 pr_warning("failed to alloc name for prog under section(%d) %s\n",
365 prog->pin_name = __bpf_program__pin_name(prog);
366 if (!prog->pin_name) {
367 pr_warning("failed to alloc pin name for prog under section(%d) %s\n",
372 prog->insns = malloc(size);
374 pr_warning("failed to alloc insns for prog under section %s\n",
378 prog->insns_cnt = size / sizeof(struct bpf_insn);
379 memcpy(prog->insns, data,
380 prog->insns_cnt * sizeof(struct bpf_insn));
382 prog->instances.fds = NULL;
383 prog->instances.nr = -1;
384 prog->type = BPF_PROG_TYPE_UNSPEC;
389 bpf_program__exit(prog);
394 bpf_object__add_program(struct bpf_object *obj, void *data, size_t size,
395 char *section_name, int idx)
397 struct bpf_program prog, *progs;
400 err = bpf_program__init(data, size, section_name, idx, &prog);
404 prog.caps = &obj->caps;
405 progs = obj->programs;
406 nr_progs = obj->nr_programs;
408 progs = reallocarray(progs, nr_progs + 1, sizeof(progs[0]));
411 * In this case the original obj->programs
412 * is still valid, so don't need special treat for
413 * bpf_close_object().
415 pr_warning("failed to alloc a new program under section '%s'\n",
417 bpf_program__exit(&prog);
421 pr_debug("found program %s\n", prog.section_name);
422 obj->programs = progs;
423 obj->nr_programs = nr_progs + 1;
425 progs[nr_progs] = prog;
430 bpf_object__init_prog_names(struct bpf_object *obj)
432 Elf_Data *symbols = obj->efile.symbols;
433 struct bpf_program *prog;
436 for (pi = 0; pi < obj->nr_programs; pi++) {
437 const char *name = NULL;
439 prog = &obj->programs[pi];
441 for (si = 0; si < symbols->d_size / sizeof(GElf_Sym) && !name;
445 if (!gelf_getsym(symbols, si, &sym))
447 if (sym.st_shndx != prog->idx)
449 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL)
452 name = elf_strptr(obj->efile.elf,
453 obj->efile.strtabidx,
456 pr_warning("failed to get sym name string for prog %s\n",
458 return -LIBBPF_ERRNO__LIBELF;
462 if (!name && prog->idx == obj->efile.text_shndx)
466 pr_warning("failed to find sym for prog %s\n",
471 prog->name = strdup(name);
473 pr_warning("failed to allocate memory for prog sym %s\n",
482 static struct bpf_object *bpf_object__new(const char *path,
486 struct bpf_object *obj;
489 obj = calloc(1, sizeof(struct bpf_object) + strlen(path) + 1);
491 pr_warning("alloc memory failed for %s\n", path);
492 return ERR_PTR(-ENOMEM);
495 strcpy(obj->path, path);
496 /* Using basename() GNU version which doesn't modify arg. */
497 strncpy(obj->name, basename((void *)path),
498 sizeof(obj->name) - 1);
499 end = strchr(obj->name, '.');
505 * Caller of this function should also calls
506 * bpf_object__elf_finish() after data collection to return
507 * obj_buf to user. If not, we should duplicate the buffer to
508 * avoid user freeing them before elf finish.
510 obj->efile.obj_buf = obj_buf;
511 obj->efile.obj_buf_sz = obj_buf_sz;
512 obj->efile.maps_shndx = -1;
513 obj->efile.data_shndx = -1;
514 obj->efile.rodata_shndx = -1;
515 obj->efile.bss_shndx = -1;
519 INIT_LIST_HEAD(&obj->list);
520 list_add(&obj->list, &bpf_objects_list);
524 static void bpf_object__elf_finish(struct bpf_object *obj)
526 if (!obj_elf_valid(obj))
529 if (obj->efile.elf) {
530 elf_end(obj->efile.elf);
531 obj->efile.elf = NULL;
533 obj->efile.symbols = NULL;
534 obj->efile.data = NULL;
535 obj->efile.rodata = NULL;
536 obj->efile.bss = NULL;
538 zfree(&obj->efile.reloc);
539 obj->efile.nr_reloc = 0;
540 zclose(obj->efile.fd);
541 obj->efile.obj_buf = NULL;
542 obj->efile.obj_buf_sz = 0;
545 static int bpf_object__elf_init(struct bpf_object *obj)
550 if (obj_elf_valid(obj)) {
551 pr_warning("elf init: internal error\n");
552 return -LIBBPF_ERRNO__LIBELF;
555 if (obj->efile.obj_buf_sz > 0) {
557 * obj_buf should have been validated by
558 * bpf_object__open_buffer().
560 obj->efile.elf = elf_memory(obj->efile.obj_buf,
561 obj->efile.obj_buf_sz);
563 obj->efile.fd = open(obj->path, O_RDONLY);
564 if (obj->efile.fd < 0) {
565 char errmsg[STRERR_BUFSIZE];
566 char *cp = libbpf_strerror_r(errno, errmsg,
569 pr_warning("failed to open %s: %s\n", obj->path, cp);
573 obj->efile.elf = elf_begin(obj->efile.fd,
574 LIBBPF_ELF_C_READ_MMAP,
578 if (!obj->efile.elf) {
579 pr_warning("failed to open %s as ELF file\n",
581 err = -LIBBPF_ERRNO__LIBELF;
585 if (!gelf_getehdr(obj->efile.elf, &obj->efile.ehdr)) {
586 pr_warning("failed to get EHDR from %s\n",
588 err = -LIBBPF_ERRNO__FORMAT;
591 ep = &obj->efile.ehdr;
593 /* Old LLVM set e_machine to EM_NONE */
594 if ((ep->e_type != ET_REL) || (ep->e_machine && (ep->e_machine != EM_BPF))) {
595 pr_warning("%s is not an eBPF object file\n",
597 err = -LIBBPF_ERRNO__FORMAT;
603 bpf_object__elf_finish(obj);
608 bpf_object__check_endianness(struct bpf_object *obj)
610 static unsigned int const endian = 1;
612 switch (obj->efile.ehdr.e_ident[EI_DATA]) {
614 /* We are big endian, BPF obj is little endian. */
615 if (*(unsigned char const *)&endian != 1)
620 /* We are little endian, BPF obj is big endian. */
621 if (*(unsigned char const *)&endian != 0)
625 return -LIBBPF_ERRNO__ENDIAN;
631 pr_warning("Error: endianness mismatch.\n");
632 return -LIBBPF_ERRNO__ENDIAN;
636 bpf_object__init_license(struct bpf_object *obj,
637 void *data, size_t size)
639 memcpy(obj->license, data,
640 min(size, sizeof(obj->license) - 1));
641 pr_debug("license of %s is %s\n", obj->path, obj->license);
646 bpf_object__init_kversion(struct bpf_object *obj,
647 void *data, size_t size)
651 if (size != sizeof(kver)) {
652 pr_warning("invalid kver section in %s\n", obj->path);
653 return -LIBBPF_ERRNO__FORMAT;
655 memcpy(&kver, data, sizeof(kver));
656 obj->kern_version = kver;
657 pr_debug("kernel version of %s is %x\n", obj->path,
662 static int compare_bpf_map(const void *_a, const void *_b)
664 const struct bpf_map *a = _a;
665 const struct bpf_map *b = _b;
667 return a->offset - b->offset;
670 static bool bpf_map_type__is_map_in_map(enum bpf_map_type type)
672 if (type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
673 type == BPF_MAP_TYPE_HASH_OF_MAPS)
678 static int bpf_object_search_section_size(const struct bpf_object *obj,
679 const char *name, size_t *d_size)
681 const GElf_Ehdr *ep = &obj->efile.ehdr;
682 Elf *elf = obj->efile.elf;
686 while ((scn = elf_nextscn(elf, scn)) != NULL) {
687 const char *sec_name;
692 if (gelf_getshdr(scn, &sh) != &sh) {
693 pr_warning("failed to get section(%d) header from %s\n",
698 sec_name = elf_strptr(elf, ep->e_shstrndx, sh.sh_name);
700 pr_warning("failed to get section(%d) name from %s\n",
705 if (strcmp(name, sec_name))
708 data = elf_getdata(scn, 0);
710 pr_warning("failed to get section(%d) data from %s(%s)\n",
711 idx, name, obj->path);
715 *d_size = data->d_size;
722 int bpf_object__section_size(const struct bpf_object *obj, const char *name,
731 } else if (!strcmp(name, ".data")) {
733 *size = obj->efile.data->d_size;
734 } else if (!strcmp(name, ".bss")) {
736 *size = obj->efile.bss->d_size;
737 } else if (!strcmp(name, ".rodata")) {
738 if (obj->efile.rodata)
739 *size = obj->efile.rodata->d_size;
741 ret = bpf_object_search_section_size(obj, name, &d_size);
746 return *size ? 0 : ret;
749 int bpf_object__variable_offset(const struct bpf_object *obj, const char *name,
752 Elf_Data *symbols = obj->efile.symbols;
759 for (si = 0; si < symbols->d_size / sizeof(GElf_Sym); si++) {
762 if (!gelf_getsym(symbols, si, &sym))
764 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL ||
765 GELF_ST_TYPE(sym.st_info) != STT_OBJECT)
768 sname = elf_strptr(obj->efile.elf, obj->efile.strtabidx,
771 pr_warning("failed to get sym name string for var %s\n",
775 if (strcmp(name, sname) == 0) {
784 static bool bpf_object__has_maps(const struct bpf_object *obj)
786 return obj->efile.maps_shndx >= 0 ||
787 obj->efile.data_shndx >= 0 ||
788 obj->efile.rodata_shndx >= 0 ||
789 obj->efile.bss_shndx >= 0;
793 bpf_object__init_internal_map(struct bpf_object *obj, struct bpf_map *map,
794 enum libbpf_map_type type, Elf_Data *data,
797 struct bpf_map_def *def = &map->def;
798 char map_name[BPF_OBJ_NAME_LEN];
800 map->libbpf_type = type;
801 map->offset = ~(typeof(map->offset))0;
802 snprintf(map_name, sizeof(map_name), "%.8s%.7s", obj->name,
803 libbpf_type_to_btf_name[type]);
804 map->name = strdup(map_name);
806 pr_warning("failed to alloc map name\n");
810 def->type = BPF_MAP_TYPE_ARRAY;
811 def->key_size = sizeof(int);
812 def->value_size = data->d_size;
813 def->max_entries = 1;
814 def->map_flags = type == LIBBPF_MAP_RODATA ?
815 BPF_F_RDONLY_PROG : 0;
817 *data_buff = malloc(data->d_size);
820 pr_warning("failed to alloc map content buffer\n");
823 memcpy(*data_buff, data->d_buf, data->d_size);
826 pr_debug("map %td is \"%s\"\n", map - obj->maps, map->name);
831 bpf_object__init_maps(struct bpf_object *obj, int flags)
833 int i, map_idx, map_def_sz = 0, nr_syms, nr_maps = 0, nr_maps_glob = 0;
834 bool strict = !(flags & MAPS_RELAX_COMPAT);
835 Elf_Data *symbols = obj->efile.symbols;
836 Elf_Data *data = NULL;
841 nr_syms = symbols->d_size / sizeof(GElf_Sym);
843 if (obj->efile.maps_shndx >= 0) {
844 Elf_Scn *scn = elf_getscn(obj->efile.elf,
845 obj->efile.maps_shndx);
848 data = elf_getdata(scn, NULL);
850 pr_warning("failed to get Elf_Data from map section %d\n",
851 obj->efile.maps_shndx);
857 * Count number of maps. Each map has a name.
858 * Array of maps is not supported: only the first element is
861 * TODO: Detect array of map and report error.
863 if (obj->caps.global_data) {
864 if (obj->efile.data_shndx >= 0)
866 if (obj->efile.rodata_shndx >= 0)
868 if (obj->efile.bss_shndx >= 0)
872 for (i = 0; data && i < nr_syms; i++) {
875 if (!gelf_getsym(symbols, i, &sym))
877 if (sym.st_shndx != obj->efile.maps_shndx)
882 if (!nr_maps && !nr_maps_glob)
885 /* Assume equally sized map definitions */
887 pr_debug("maps in %s: %d maps in %zd bytes\n", obj->path,
888 nr_maps, data->d_size);
890 map_def_sz = data->d_size / nr_maps;
891 if (!data->d_size || (data->d_size % nr_maps) != 0) {
892 pr_warning("unable to determine map definition size "
893 "section %s, %d maps in %zd bytes\n",
894 obj->path, nr_maps, data->d_size);
899 nr_maps += nr_maps_glob;
900 obj->maps = calloc(nr_maps, sizeof(obj->maps[0]));
902 pr_warning("alloc maps for object failed\n");
905 obj->nr_maps = nr_maps;
907 for (i = 0; i < nr_maps; i++) {
909 * fill all fd with -1 so won't close incorrect
910 * fd (fd=0 is stdin) when failure (zclose won't close
913 obj->maps[i].fd = -1;
914 obj->maps[i].inner_map_fd = -1;
918 * Fill obj->maps using data in "maps" section.
920 for (i = 0, map_idx = 0; data && i < nr_syms; i++) {
922 const char *map_name;
923 struct bpf_map_def *def;
925 if (!gelf_getsym(symbols, i, &sym))
927 if (sym.st_shndx != obj->efile.maps_shndx)
930 map_name = elf_strptr(obj->efile.elf,
931 obj->efile.strtabidx,
934 obj->maps[map_idx].libbpf_type = LIBBPF_MAP_UNSPEC;
935 obj->maps[map_idx].offset = sym.st_value;
936 if (sym.st_value + map_def_sz > data->d_size) {
937 pr_warning("corrupted maps section in %s: last map \"%s\" too small\n",
938 obj->path, map_name);
942 obj->maps[map_idx].name = strdup(map_name);
943 if (!obj->maps[map_idx].name) {
944 pr_warning("failed to alloc map name\n");
947 pr_debug("map %d is \"%s\"\n", map_idx,
948 obj->maps[map_idx].name);
949 def = (struct bpf_map_def *)(data->d_buf + sym.st_value);
951 * If the definition of the map in the object file fits in
952 * bpf_map_def, copy it. Any extra fields in our version
953 * of bpf_map_def will default to zero as a result of the
956 if (map_def_sz <= sizeof(struct bpf_map_def)) {
957 memcpy(&obj->maps[map_idx].def, def, map_def_sz);
960 * Here the map structure being read is bigger than what
961 * we expect, truncate if the excess bits are all zero.
962 * If they are not zero, reject this map as
966 for (b = ((char *)def) + sizeof(struct bpf_map_def);
967 b < ((char *)def) + map_def_sz; b++) {
969 pr_warning("maps section in %s: \"%s\" "
970 "has unrecognized, non-zero "
972 obj->path, map_name);
977 memcpy(&obj->maps[map_idx].def, def,
978 sizeof(struct bpf_map_def));
983 if (!obj->caps.global_data)
987 * Populate rest of obj->maps with libbpf internal maps.
989 if (obj->efile.data_shndx >= 0)
990 ret = bpf_object__init_internal_map(obj, &obj->maps[map_idx++],
993 &obj->sections.data);
994 if (!ret && obj->efile.rodata_shndx >= 0)
995 ret = bpf_object__init_internal_map(obj, &obj->maps[map_idx++],
998 &obj->sections.rodata);
999 if (!ret && obj->efile.bss_shndx >= 0)
1000 ret = bpf_object__init_internal_map(obj, &obj->maps[map_idx++],
1002 obj->efile.bss, NULL);
1005 qsort(obj->maps, obj->nr_maps, sizeof(obj->maps[0]),
1010 static bool section_have_execinstr(struct bpf_object *obj, int idx)
1015 scn = elf_getscn(obj->efile.elf, idx);
1019 if (gelf_getshdr(scn, &sh) != &sh)
1022 if (sh.sh_flags & SHF_EXECINSTR)
1028 static void bpf_object__sanitize_btf(struct bpf_object *obj)
1030 bool has_datasec = obj->caps.btf_datasec;
1031 bool has_func = obj->caps.btf_func;
1032 struct btf *btf = obj->btf;
1037 if (!obj->btf || (has_func && has_datasec))
1040 for (i = 1; i <= btf__get_nr_types(btf); i++) {
1041 t = (struct btf_type *)btf__type_by_id(btf, i);
1042 kind = BTF_INFO_KIND(t->info);
1044 if (!has_datasec && kind == BTF_KIND_VAR) {
1045 /* replace VAR with INT */
1046 t->info = BTF_INFO_ENC(BTF_KIND_INT, 0, 0);
1047 t->size = sizeof(int);
1048 *(int *)(t+1) = BTF_INT_ENC(0, 0, 32);
1049 } else if (!has_datasec && kind == BTF_KIND_DATASEC) {
1050 /* replace DATASEC with STRUCT */
1051 struct btf_var_secinfo *v = (void *)(t + 1);
1052 struct btf_member *m = (void *)(t + 1);
1053 struct btf_type *vt;
1056 name = (char *)btf__name_by_offset(btf, t->name_off);
1063 vlen = BTF_INFO_VLEN(t->info);
1064 t->info = BTF_INFO_ENC(BTF_KIND_STRUCT, 0, vlen);
1065 for (j = 0; j < vlen; j++, v++, m++) {
1066 /* order of field assignments is important */
1067 m->offset = v->offset * 8;
1069 /* preserve variable name as member name */
1070 vt = (void *)btf__type_by_id(btf, v->type);
1071 m->name_off = vt->name_off;
1073 } else if (!has_func && kind == BTF_KIND_FUNC_PROTO) {
1074 /* replace FUNC_PROTO with ENUM */
1075 vlen = BTF_INFO_VLEN(t->info);
1076 t->info = BTF_INFO_ENC(BTF_KIND_ENUM, 0, vlen);
1077 t->size = sizeof(__u32); /* kernel enforced */
1078 } else if (!has_func && kind == BTF_KIND_FUNC) {
1079 /* replace FUNC with TYPEDEF */
1080 t->info = BTF_INFO_ENC(BTF_KIND_TYPEDEF, 0, 0);
1085 static void bpf_object__sanitize_btf_ext(struct bpf_object *obj)
1090 if (!obj->caps.btf_func) {
1091 btf_ext__free(obj->btf_ext);
1092 obj->btf_ext = NULL;
1096 static int bpf_object__elf_collect(struct bpf_object *obj, int flags)
1098 Elf *elf = obj->efile.elf;
1099 GElf_Ehdr *ep = &obj->efile.ehdr;
1100 Elf_Data *btf_ext_data = NULL;
1101 Elf_Data *btf_data = NULL;
1102 Elf_Scn *scn = NULL;
1103 int idx = 0, err = 0;
1105 /* Elf is corrupted/truncated, avoid calling elf_strptr. */
1106 if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) {
1107 pr_warning("failed to get e_shstrndx from %s\n",
1109 return -LIBBPF_ERRNO__FORMAT;
1112 while ((scn = elf_nextscn(elf, scn)) != NULL) {
1118 if (gelf_getshdr(scn, &sh) != &sh) {
1119 pr_warning("failed to get section(%d) header from %s\n",
1121 err = -LIBBPF_ERRNO__FORMAT;
1125 name = elf_strptr(elf, ep->e_shstrndx, sh.sh_name);
1127 pr_warning("failed to get section(%d) name from %s\n",
1129 err = -LIBBPF_ERRNO__FORMAT;
1133 data = elf_getdata(scn, 0);
1135 pr_warning("failed to get section(%d) data from %s(%s)\n",
1136 idx, name, obj->path);
1137 err = -LIBBPF_ERRNO__FORMAT;
1140 pr_debug("section(%d) %s, size %ld, link %d, flags %lx, type=%d\n",
1141 idx, name, (unsigned long)data->d_size,
1142 (int)sh.sh_link, (unsigned long)sh.sh_flags,
1145 if (strcmp(name, "license") == 0) {
1146 err = bpf_object__init_license(obj,
1149 } else if (strcmp(name, "version") == 0) {
1150 err = bpf_object__init_kversion(obj,
1153 } else if (strcmp(name, "maps") == 0) {
1154 obj->efile.maps_shndx = idx;
1155 } else if (strcmp(name, BTF_ELF_SEC) == 0) {
1157 } else if (strcmp(name, BTF_EXT_ELF_SEC) == 0) {
1158 btf_ext_data = data;
1159 } else if (sh.sh_type == SHT_SYMTAB) {
1160 if (obj->efile.symbols) {
1161 pr_warning("bpf: multiple SYMTAB in %s\n",
1163 err = -LIBBPF_ERRNO__FORMAT;
1165 obj->efile.symbols = data;
1166 obj->efile.strtabidx = sh.sh_link;
1168 } else if (sh.sh_type == SHT_PROGBITS && data->d_size > 0) {
1169 if (sh.sh_flags & SHF_EXECINSTR) {
1170 if (strcmp(name, ".text") == 0)
1171 obj->efile.text_shndx = idx;
1172 err = bpf_object__add_program(obj, data->d_buf,
1173 data->d_size, name, idx);
1175 char errmsg[STRERR_BUFSIZE];
1176 char *cp = libbpf_strerror_r(-err, errmsg,
1179 pr_warning("failed to alloc program %s (%s): %s",
1180 name, obj->path, cp);
1182 } else if (strcmp(name, ".data") == 0) {
1183 obj->efile.data = data;
1184 obj->efile.data_shndx = idx;
1185 } else if (strcmp(name, ".rodata") == 0) {
1186 obj->efile.rodata = data;
1187 obj->efile.rodata_shndx = idx;
1189 pr_debug("skip section(%d) %s\n", idx, name);
1191 } else if (sh.sh_type == SHT_REL) {
1192 void *reloc = obj->efile.reloc;
1193 int nr_reloc = obj->efile.nr_reloc + 1;
1194 int sec = sh.sh_info; /* points to other section */
1196 /* Only do relo for section with exec instructions */
1197 if (!section_have_execinstr(obj, sec)) {
1198 pr_debug("skip relo %s(%d) for section(%d)\n",
1203 reloc = reallocarray(reloc, nr_reloc,
1204 sizeof(*obj->efile.reloc));
1206 pr_warning("realloc failed\n");
1209 int n = nr_reloc - 1;
1211 obj->efile.reloc = reloc;
1212 obj->efile.nr_reloc = nr_reloc;
1214 obj->efile.reloc[n].shdr = sh;
1215 obj->efile.reloc[n].data = data;
1217 } else if (sh.sh_type == SHT_NOBITS && strcmp(name, ".bss") == 0) {
1218 obj->efile.bss = data;
1219 obj->efile.bss_shndx = idx;
1221 pr_debug("skip section(%d) %s\n", idx, name);
1227 if (!obj->efile.strtabidx || obj->efile.strtabidx >= idx) {
1228 pr_warning("Corrupted ELF file: index of strtab invalid\n");
1229 return LIBBPF_ERRNO__FORMAT;
1232 obj->btf = btf__new(btf_data->d_buf, btf_data->d_size);
1233 if (IS_ERR(obj->btf)) {
1234 pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
1235 BTF_ELF_SEC, PTR_ERR(obj->btf));
1238 err = btf__finalize_data(obj, obj->btf);
1240 bpf_object__sanitize_btf(obj);
1241 err = btf__load(obj->btf);
1244 pr_warning("Error finalizing and loading %s into kernel: %d. Ignored and continue.\n",
1246 btf__free(obj->btf);
1254 pr_debug("Ignore ELF section %s because its depending ELF section %s is not found.\n",
1255 BTF_EXT_ELF_SEC, BTF_ELF_SEC);
1257 obj->btf_ext = btf_ext__new(btf_ext_data->d_buf,
1258 btf_ext_data->d_size);
1259 if (IS_ERR(obj->btf_ext)) {
1260 pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
1262 PTR_ERR(obj->btf_ext));
1263 obj->btf_ext = NULL;
1265 bpf_object__sanitize_btf_ext(obj);
1269 if (bpf_object__has_maps(obj)) {
1270 err = bpf_object__init_maps(obj, flags);
1274 err = bpf_object__init_prog_names(obj);
1279 static struct bpf_program *
1280 bpf_object__find_prog_by_idx(struct bpf_object *obj, int idx)
1282 struct bpf_program *prog;
1285 for (i = 0; i < obj->nr_programs; i++) {
1286 prog = &obj->programs[i];
1287 if (prog->idx == idx)
1293 struct bpf_program *
1294 bpf_object__find_program_by_title(struct bpf_object *obj, const char *title)
1296 struct bpf_program *pos;
1298 bpf_object__for_each_program(pos, obj) {
1299 if (pos->section_name && !strcmp(pos->section_name, title))
1305 static bool bpf_object__shndx_is_data(const struct bpf_object *obj,
1308 return shndx == obj->efile.data_shndx ||
1309 shndx == obj->efile.bss_shndx ||
1310 shndx == obj->efile.rodata_shndx;
1313 static bool bpf_object__shndx_is_maps(const struct bpf_object *obj,
1316 return shndx == obj->efile.maps_shndx;
1319 static bool bpf_object__relo_in_known_section(const struct bpf_object *obj,
1322 return shndx == obj->efile.text_shndx ||
1323 bpf_object__shndx_is_maps(obj, shndx) ||
1324 bpf_object__shndx_is_data(obj, shndx);
1327 static enum libbpf_map_type
1328 bpf_object__section_to_libbpf_map_type(const struct bpf_object *obj, int shndx)
1330 if (shndx == obj->efile.data_shndx)
1331 return LIBBPF_MAP_DATA;
1332 else if (shndx == obj->efile.bss_shndx)
1333 return LIBBPF_MAP_BSS;
1334 else if (shndx == obj->efile.rodata_shndx)
1335 return LIBBPF_MAP_RODATA;
1337 return LIBBPF_MAP_UNSPEC;
1341 bpf_program__collect_reloc(struct bpf_program *prog, GElf_Shdr *shdr,
1342 Elf_Data *data, struct bpf_object *obj)
1344 Elf_Data *symbols = obj->efile.symbols;
1345 struct bpf_map *maps = obj->maps;
1346 size_t nr_maps = obj->nr_maps;
1349 pr_debug("collecting relocating info for: '%s'\n",
1350 prog->section_name);
1351 nrels = shdr->sh_size / shdr->sh_entsize;
1353 prog->reloc_desc = malloc(sizeof(*prog->reloc_desc) * nrels);
1354 if (!prog->reloc_desc) {
1355 pr_warning("failed to alloc memory in relocation\n");
1358 prog->nr_reloc = nrels;
1360 for (i = 0; i < nrels; i++) {
1363 unsigned int insn_idx;
1364 unsigned int shdr_idx;
1365 struct bpf_insn *insns = prog->insns;
1366 enum libbpf_map_type type;
1370 if (!gelf_getrel(data, i, &rel)) {
1371 pr_warning("relocation: failed to get %d reloc\n", i);
1372 return -LIBBPF_ERRNO__FORMAT;
1375 if (!gelf_getsym(symbols,
1376 GELF_R_SYM(rel.r_info),
1378 pr_warning("relocation: symbol %"PRIx64" not found\n",
1379 GELF_R_SYM(rel.r_info));
1380 return -LIBBPF_ERRNO__FORMAT;
1383 name = elf_strptr(obj->efile.elf, obj->efile.strtabidx,
1384 sym.st_name) ? : "<?>";
1386 pr_debug("relo for %lld value %lld name %d (\'%s\')\n",
1387 (long long) (rel.r_info >> 32),
1388 (long long) sym.st_value, sym.st_name, name);
1390 shdr_idx = sym.st_shndx;
1391 if (!bpf_object__relo_in_known_section(obj, shdr_idx)) {
1392 pr_warning("Program '%s' contains unrecognized relo data pointing to section %u\n",
1393 prog->section_name, shdr_idx);
1394 return -LIBBPF_ERRNO__RELOC;
1397 insn_idx = rel.r_offset / sizeof(struct bpf_insn);
1398 pr_debug("relocation: insn_idx=%u\n", insn_idx);
1400 if (insns[insn_idx].code == (BPF_JMP | BPF_CALL)) {
1401 if (insns[insn_idx].src_reg != BPF_PSEUDO_CALL) {
1402 pr_warning("incorrect bpf_call opcode\n");
1403 return -LIBBPF_ERRNO__RELOC;
1405 prog->reloc_desc[i].type = RELO_CALL;
1406 prog->reloc_desc[i].insn_idx = insn_idx;
1407 prog->reloc_desc[i].text_off = sym.st_value;
1408 obj->has_pseudo_calls = true;
1412 if (insns[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) {
1413 pr_warning("bpf: relocation: invalid relo for insns[%d].code 0x%x\n",
1414 insn_idx, insns[insn_idx].code);
1415 return -LIBBPF_ERRNO__RELOC;
1418 if (bpf_object__shndx_is_maps(obj, shdr_idx) ||
1419 bpf_object__shndx_is_data(obj, shdr_idx)) {
1420 type = bpf_object__section_to_libbpf_map_type(obj, shdr_idx);
1421 if (type != LIBBPF_MAP_UNSPEC) {
1422 if (GELF_ST_BIND(sym.st_info) == STB_GLOBAL) {
1423 pr_warning("bpf: relocation: not yet supported relo for non-static global \'%s\' variable found in insns[%d].code 0x%x\n",
1424 name, insn_idx, insns[insn_idx].code);
1425 return -LIBBPF_ERRNO__RELOC;
1427 if (!obj->caps.global_data) {
1428 pr_warning("bpf: relocation: kernel does not support global \'%s\' variable access in insns[%d]\n",
1430 return -LIBBPF_ERRNO__RELOC;
1434 for (map_idx = 0; map_idx < nr_maps; map_idx++) {
1435 if (maps[map_idx].libbpf_type != type)
1437 if (type != LIBBPF_MAP_UNSPEC ||
1438 (type == LIBBPF_MAP_UNSPEC &&
1439 maps[map_idx].offset == sym.st_value)) {
1440 pr_debug("relocation: find map %zd (%s) for insn %u\n",
1441 map_idx, maps[map_idx].name, insn_idx);
1446 if (map_idx >= nr_maps) {
1447 pr_warning("bpf relocation: map_idx %d large than %d\n",
1448 (int)map_idx, (int)nr_maps - 1);
1449 return -LIBBPF_ERRNO__RELOC;
1452 prog->reloc_desc[i].type = type != LIBBPF_MAP_UNSPEC ?
1453 RELO_DATA : RELO_LD64;
1454 prog->reloc_desc[i].insn_idx = insn_idx;
1455 prog->reloc_desc[i].map_idx = map_idx;
1461 static int bpf_map_find_btf_info(struct bpf_map *map, const struct btf *btf)
1463 struct bpf_map_def *def = &map->def;
1464 __u32 key_type_id = 0, value_type_id = 0;
1467 if (!bpf_map__is_internal(map)) {
1468 ret = btf__get_map_kv_tids(btf, map->name, def->key_size,
1469 def->value_size, &key_type_id,
1473 * LLVM annotates global data differently in BTF, that is,
1474 * only as '.data', '.bss' or '.rodata'.
1476 ret = btf__find_by_name(btf,
1477 libbpf_type_to_btf_name[map->libbpf_type]);
1482 map->btf_key_type_id = key_type_id;
1483 map->btf_value_type_id = bpf_map__is_internal(map) ?
1484 ret : value_type_id;
1488 int bpf_map__reuse_fd(struct bpf_map *map, int fd)
1490 struct bpf_map_info info = {};
1491 __u32 len = sizeof(info);
1495 err = bpf_obj_get_info_by_fd(fd, &info, &len);
1499 new_name = strdup(info.name);
1503 new_fd = open("/", O_RDONLY | O_CLOEXEC);
1505 goto err_free_new_name;
1507 new_fd = dup3(fd, new_fd, O_CLOEXEC);
1509 goto err_close_new_fd;
1511 err = zclose(map->fd);
1513 goto err_close_new_fd;
1517 map->name = new_name;
1518 map->def.type = info.type;
1519 map->def.key_size = info.key_size;
1520 map->def.value_size = info.value_size;
1521 map->def.max_entries = info.max_entries;
1522 map->def.map_flags = info.map_flags;
1523 map->btf_key_type_id = info.btf_key_type_id;
1524 map->btf_value_type_id = info.btf_value_type_id;
1535 int bpf_map__resize(struct bpf_map *map, __u32 max_entries)
1537 if (!map || !max_entries)
1540 /* If map already created, its attributes can't be changed. */
1544 map->def.max_entries = max_entries;
1550 bpf_object__probe_name(struct bpf_object *obj)
1552 struct bpf_load_program_attr attr;
1553 char *cp, errmsg[STRERR_BUFSIZE];
1554 struct bpf_insn insns[] = {
1555 BPF_MOV64_IMM(BPF_REG_0, 0),
1560 /* make sure basic loading works */
1562 memset(&attr, 0, sizeof(attr));
1563 attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
1565 attr.insns_cnt = ARRAY_SIZE(insns);
1566 attr.license = "GPL";
1568 ret = bpf_load_program_xattr(&attr, NULL, 0);
1570 cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg));
1571 pr_warning("Error in %s():%s(%d). Couldn't load basic 'r0 = 0' BPF program.\n",
1572 __func__, cp, errno);
1577 /* now try the same program, but with the name */
1580 ret = bpf_load_program_xattr(&attr, NULL, 0);
1590 bpf_object__probe_global_data(struct bpf_object *obj)
1592 struct bpf_load_program_attr prg_attr;
1593 struct bpf_create_map_attr map_attr;
1594 char *cp, errmsg[STRERR_BUFSIZE];
1595 struct bpf_insn insns[] = {
1596 BPF_LD_MAP_VALUE(BPF_REG_1, 0, 16),
1597 BPF_ST_MEM(BPF_DW, BPF_REG_1, 0, 42),
1598 BPF_MOV64_IMM(BPF_REG_0, 0),
1603 memset(&map_attr, 0, sizeof(map_attr));
1604 map_attr.map_type = BPF_MAP_TYPE_ARRAY;
1605 map_attr.key_size = sizeof(int);
1606 map_attr.value_size = 32;
1607 map_attr.max_entries = 1;
1609 map = bpf_create_map_xattr(&map_attr);
1611 cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg));
1612 pr_warning("Error in %s():%s(%d). Couldn't create simple array map.\n",
1613 __func__, cp, errno);
1619 memset(&prg_attr, 0, sizeof(prg_attr));
1620 prg_attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
1621 prg_attr.insns = insns;
1622 prg_attr.insns_cnt = ARRAY_SIZE(insns);
1623 prg_attr.license = "GPL";
1625 ret = bpf_load_program_xattr(&prg_attr, NULL, 0);
1627 obj->caps.global_data = 1;
1635 static int bpf_object__probe_btf_func(struct bpf_object *obj)
1637 const char strs[] = "\0int\0x\0a";
1638 /* void x(int a) {} */
1641 BTF_TYPE_INT_ENC(1, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
1642 /* FUNC_PROTO */ /* [2] */
1643 BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_FUNC_PROTO, 0, 1), 0),
1644 BTF_PARAM_ENC(7, 1),
1645 /* FUNC x */ /* [3] */
1646 BTF_TYPE_ENC(5, BTF_INFO_ENC(BTF_KIND_FUNC, 0, 0), 2),
1650 res = libbpf__probe_raw_btf((char *)types, sizeof(types),
1651 strs, sizeof(strs));
1655 obj->caps.btf_func = 1;
1659 static int bpf_object__probe_btf_datasec(struct bpf_object *obj)
1661 const char strs[] = "\0x\0.data";
1665 BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
1666 /* VAR x */ /* [2] */
1667 BTF_TYPE_ENC(1, BTF_INFO_ENC(BTF_KIND_VAR, 0, 0), 1),
1669 /* DATASEC val */ /* [3] */
1670 BTF_TYPE_ENC(3, BTF_INFO_ENC(BTF_KIND_DATASEC, 0, 1), 4),
1671 BTF_VAR_SECINFO_ENC(2, 0, 4),
1675 res = libbpf__probe_raw_btf((char *)types, sizeof(types),
1676 strs, sizeof(strs));
1680 obj->caps.btf_datasec = 1;
1685 bpf_object__probe_caps(struct bpf_object *obj)
1687 int (*probe_fn[])(struct bpf_object *obj) = {
1688 bpf_object__probe_name,
1689 bpf_object__probe_global_data,
1690 bpf_object__probe_btf_func,
1691 bpf_object__probe_btf_datasec,
1695 for (i = 0; i < ARRAY_SIZE(probe_fn); i++) {
1696 ret = probe_fn[i](obj);
1698 pr_debug("Probe #%d failed with %d.\n", i, ret);
1705 bpf_object__populate_internal_map(struct bpf_object *obj, struct bpf_map *map)
1707 char *cp, errmsg[STRERR_BUFSIZE];
1711 /* Nothing to do here since kernel already zero-initializes .bss map. */
1712 if (map->libbpf_type == LIBBPF_MAP_BSS)
1715 data = map->libbpf_type == LIBBPF_MAP_DATA ?
1716 obj->sections.data : obj->sections.rodata;
1718 err = bpf_map_update_elem(map->fd, &zero, data, 0);
1719 /* Freeze .rodata map as read-only from syscall side. */
1720 if (!err && map->libbpf_type == LIBBPF_MAP_RODATA) {
1721 err = bpf_map_freeze(map->fd);
1723 cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg));
1724 pr_warning("Error freezing map(%s) as read-only: %s\n",
1733 bpf_object__create_maps(struct bpf_object *obj)
1735 struct bpf_create_map_attr create_attr = {};
1739 for (i = 0; i < obj->nr_maps; i++) {
1740 struct bpf_map *map = &obj->maps[i];
1741 struct bpf_map_def *def = &map->def;
1742 char *cp, errmsg[STRERR_BUFSIZE];
1743 int *pfd = &map->fd;
1746 pr_debug("skip map create (preset) %s: fd=%d\n",
1747 map->name, map->fd);
1752 create_attr.name = map->name;
1753 create_attr.map_ifindex = map->map_ifindex;
1754 create_attr.map_type = def->type;
1755 create_attr.map_flags = def->map_flags;
1756 create_attr.key_size = def->key_size;
1757 create_attr.value_size = def->value_size;
1758 create_attr.max_entries = def->max_entries;
1759 create_attr.btf_fd = 0;
1760 create_attr.btf_key_type_id = 0;
1761 create_attr.btf_value_type_id = 0;
1762 if (bpf_map_type__is_map_in_map(def->type) &&
1763 map->inner_map_fd >= 0)
1764 create_attr.inner_map_fd = map->inner_map_fd;
1766 if (obj->btf && !bpf_map_find_btf_info(map, obj->btf)) {
1767 create_attr.btf_fd = btf__fd(obj->btf);
1768 create_attr.btf_key_type_id = map->btf_key_type_id;
1769 create_attr.btf_value_type_id = map->btf_value_type_id;
1772 *pfd = bpf_create_map_xattr(&create_attr);
1773 if (*pfd < 0 && create_attr.btf_key_type_id) {
1774 cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg));
1775 pr_warning("Error in bpf_create_map_xattr(%s):%s(%d). Retrying without BTF.\n",
1776 map->name, cp, errno);
1777 create_attr.btf_fd = 0;
1778 create_attr.btf_key_type_id = 0;
1779 create_attr.btf_value_type_id = 0;
1780 map->btf_key_type_id = 0;
1781 map->btf_value_type_id = 0;
1782 *pfd = bpf_create_map_xattr(&create_attr);
1790 cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg));
1791 pr_warning("failed to create map (name: '%s'): %s\n",
1793 for (j = 0; j < i; j++)
1794 zclose(obj->maps[j].fd);
1798 if (bpf_map__is_internal(map)) {
1799 err = bpf_object__populate_internal_map(obj, map);
1806 pr_debug("create map %s: fd=%d\n", map->name, *pfd);
1813 check_btf_ext_reloc_err(struct bpf_program *prog, int err,
1814 void *btf_prog_info, const char *info_name)
1816 if (err != -ENOENT) {
1817 pr_warning("Error in loading %s for sec %s.\n",
1818 info_name, prog->section_name);
1822 /* err == -ENOENT (i.e. prog->section_name not found in btf_ext) */
1824 if (btf_prog_info) {
1826 * Some info has already been found but has problem
1827 * in the last btf_ext reloc. Must have to error
1830 pr_warning("Error in relocating %s for sec %s.\n",
1831 info_name, prog->section_name);
1836 * Have problem loading the very first info. Ignore
1839 pr_warning("Cannot find %s for main program sec %s. Ignore all %s.\n",
1840 info_name, prog->section_name, info_name);
1845 bpf_program_reloc_btf_ext(struct bpf_program *prog, struct bpf_object *obj,
1846 const char *section_name, __u32 insn_offset)
1850 if (!insn_offset || prog->func_info) {
1852 * !insn_offset => main program
1854 * For sub prog, the main program's func_info has to
1855 * be loaded first (i.e. prog->func_info != NULL)
1857 err = btf_ext__reloc_func_info(obj->btf, obj->btf_ext,
1858 section_name, insn_offset,
1860 &prog->func_info_cnt);
1862 return check_btf_ext_reloc_err(prog, err,
1866 prog->func_info_rec_size = btf_ext__func_info_rec_size(obj->btf_ext);
1869 if (!insn_offset || prog->line_info) {
1870 err = btf_ext__reloc_line_info(obj->btf, obj->btf_ext,
1871 section_name, insn_offset,
1873 &prog->line_info_cnt);
1875 return check_btf_ext_reloc_err(prog, err,
1879 prog->line_info_rec_size = btf_ext__line_info_rec_size(obj->btf_ext);
1883 prog->btf_fd = btf__fd(obj->btf);
1889 bpf_program__reloc_text(struct bpf_program *prog, struct bpf_object *obj,
1890 struct reloc_desc *relo)
1892 struct bpf_insn *insn, *new_insn;
1893 struct bpf_program *text;
1897 if (relo->type != RELO_CALL)
1898 return -LIBBPF_ERRNO__RELOC;
1900 if (prog->idx == obj->efile.text_shndx) {
1901 pr_warning("relo in .text insn %d into off %d\n",
1902 relo->insn_idx, relo->text_off);
1903 return -LIBBPF_ERRNO__RELOC;
1906 if (prog->main_prog_cnt == 0) {
1907 text = bpf_object__find_prog_by_idx(obj, obj->efile.text_shndx);
1909 pr_warning("no .text section found yet relo into text exist\n");
1910 return -LIBBPF_ERRNO__RELOC;
1912 new_cnt = prog->insns_cnt + text->insns_cnt;
1913 new_insn = reallocarray(prog->insns, new_cnt, sizeof(*insn));
1915 pr_warning("oom in prog realloc\n");
1920 err = bpf_program_reloc_btf_ext(prog, obj,
1927 memcpy(new_insn + prog->insns_cnt, text->insns,
1928 text->insns_cnt * sizeof(*insn));
1929 prog->insns = new_insn;
1930 prog->main_prog_cnt = prog->insns_cnt;
1931 prog->insns_cnt = new_cnt;
1932 pr_debug("added %zd insn from %s to prog %s\n",
1933 text->insns_cnt, text->section_name,
1934 prog->section_name);
1936 insn = &prog->insns[relo->insn_idx];
1937 insn->imm += prog->main_prog_cnt - relo->insn_idx;
1942 bpf_program__relocate(struct bpf_program *prog, struct bpf_object *obj)
1950 err = bpf_program_reloc_btf_ext(prog, obj,
1951 prog->section_name, 0);
1956 if (!prog->reloc_desc)
1959 for (i = 0; i < prog->nr_reloc; i++) {
1960 if (prog->reloc_desc[i].type == RELO_LD64 ||
1961 prog->reloc_desc[i].type == RELO_DATA) {
1962 bool relo_data = prog->reloc_desc[i].type == RELO_DATA;
1963 struct bpf_insn *insns = prog->insns;
1964 int insn_idx, map_idx;
1966 insn_idx = prog->reloc_desc[i].insn_idx;
1967 map_idx = prog->reloc_desc[i].map_idx;
1969 if (insn_idx + 1 >= (int)prog->insns_cnt) {
1970 pr_warning("relocation out of range: '%s'\n",
1971 prog->section_name);
1972 return -LIBBPF_ERRNO__RELOC;
1976 insns[insn_idx].src_reg = BPF_PSEUDO_MAP_FD;
1978 insns[insn_idx].src_reg = BPF_PSEUDO_MAP_VALUE;
1979 insns[insn_idx + 1].imm = insns[insn_idx].imm;
1981 insns[insn_idx].imm = obj->maps[map_idx].fd;
1982 } else if (prog->reloc_desc[i].type == RELO_CALL) {
1983 err = bpf_program__reloc_text(prog, obj,
1984 &prog->reloc_desc[i]);
1990 zfree(&prog->reloc_desc);
1997 bpf_object__relocate(struct bpf_object *obj)
1999 struct bpf_program *prog;
2003 for (i = 0; i < obj->nr_programs; i++) {
2004 prog = &obj->programs[i];
2006 err = bpf_program__relocate(prog, obj);
2008 pr_warning("failed to relocate '%s'\n",
2009 prog->section_name);
2016 static int bpf_object__collect_reloc(struct bpf_object *obj)
2020 if (!obj_elf_valid(obj)) {
2021 pr_warning("Internal error: elf object is closed\n");
2022 return -LIBBPF_ERRNO__INTERNAL;
2025 for (i = 0; i < obj->efile.nr_reloc; i++) {
2026 GElf_Shdr *shdr = &obj->efile.reloc[i].shdr;
2027 Elf_Data *data = obj->efile.reloc[i].data;
2028 int idx = shdr->sh_info;
2029 struct bpf_program *prog;
2031 if (shdr->sh_type != SHT_REL) {
2032 pr_warning("internal error at %d\n", __LINE__);
2033 return -LIBBPF_ERRNO__INTERNAL;
2036 prog = bpf_object__find_prog_by_idx(obj, idx);
2038 pr_warning("relocation failed: no section(%d)\n", idx);
2039 return -LIBBPF_ERRNO__RELOC;
2042 err = bpf_program__collect_reloc(prog,
2052 load_program(struct bpf_program *prog, struct bpf_insn *insns, int insns_cnt,
2053 char *license, __u32 kern_version, int *pfd)
2055 struct bpf_load_program_attr load_attr;
2056 char *cp, errmsg[STRERR_BUFSIZE];
2057 int log_buf_size = BPF_LOG_BUF_SIZE;
2061 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
2062 load_attr.prog_type = prog->type;
2063 load_attr.expected_attach_type = prog->expected_attach_type;
2064 if (prog->caps->name)
2065 load_attr.name = prog->name;
2066 load_attr.insns = insns;
2067 load_attr.insns_cnt = insns_cnt;
2068 load_attr.license = license;
2069 load_attr.kern_version = kern_version;
2070 load_attr.prog_ifindex = prog->prog_ifindex;
2071 load_attr.prog_btf_fd = prog->btf_fd >= 0 ? prog->btf_fd : 0;
2072 load_attr.func_info = prog->func_info;
2073 load_attr.func_info_rec_size = prog->func_info_rec_size;
2074 load_attr.func_info_cnt = prog->func_info_cnt;
2075 load_attr.line_info = prog->line_info;
2076 load_attr.line_info_rec_size = prog->line_info_rec_size;
2077 load_attr.line_info_cnt = prog->line_info_cnt;
2078 load_attr.log_level = prog->log_level;
2079 if (!load_attr.insns || !load_attr.insns_cnt)
2083 log_buf = malloc(log_buf_size);
2085 pr_warning("Alloc log buffer for bpf loader error, continue without log\n");
2087 ret = bpf_load_program_xattr(&load_attr, log_buf, log_buf_size);
2090 if (load_attr.log_level)
2091 pr_debug("verifier log:\n%s", log_buf);
2097 if (errno == ENOSPC) {
2102 ret = -LIBBPF_ERRNO__LOAD;
2103 cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg));
2104 pr_warning("load bpf program failed: %s\n", cp);
2106 if (log_buf && log_buf[0] != '\0') {
2107 ret = -LIBBPF_ERRNO__VERIFY;
2108 pr_warning("-- BEGIN DUMP LOG ---\n");
2109 pr_warning("\n%s\n", log_buf);
2110 pr_warning("-- END LOG --\n");
2111 } else if (load_attr.insns_cnt >= BPF_MAXINSNS) {
2112 pr_warning("Program too large (%zu insns), at most %d insns\n",
2113 load_attr.insns_cnt, BPF_MAXINSNS);
2114 ret = -LIBBPF_ERRNO__PROG2BIG;
2116 /* Wrong program type? */
2117 if (load_attr.prog_type != BPF_PROG_TYPE_KPROBE) {
2120 load_attr.prog_type = BPF_PROG_TYPE_KPROBE;
2121 load_attr.expected_attach_type = 0;
2122 fd = bpf_load_program_xattr(&load_attr, NULL, 0);
2125 ret = -LIBBPF_ERRNO__PROGTYPE;
2131 ret = -LIBBPF_ERRNO__KVER;
2140 bpf_program__load(struct bpf_program *prog,
2141 char *license, __u32 kern_version)
2145 if (prog->instances.nr < 0 || !prog->instances.fds) {
2146 if (prog->preprocessor) {
2147 pr_warning("Internal error: can't load program '%s'\n",
2148 prog->section_name);
2149 return -LIBBPF_ERRNO__INTERNAL;
2152 prog->instances.fds = malloc(sizeof(int));
2153 if (!prog->instances.fds) {
2154 pr_warning("Not enough memory for BPF fds\n");
2157 prog->instances.nr = 1;
2158 prog->instances.fds[0] = -1;
2161 if (!prog->preprocessor) {
2162 if (prog->instances.nr != 1) {
2163 pr_warning("Program '%s' is inconsistent: nr(%d) != 1\n",
2164 prog->section_name, prog->instances.nr);
2166 err = load_program(prog, prog->insns, prog->insns_cnt,
2167 license, kern_version, &fd);
2169 prog->instances.fds[0] = fd;
2173 for (i = 0; i < prog->instances.nr; i++) {
2174 struct bpf_prog_prep_result result;
2175 bpf_program_prep_t preprocessor = prog->preprocessor;
2177 memset(&result, 0, sizeof(result));
2178 err = preprocessor(prog, i, prog->insns,
2179 prog->insns_cnt, &result);
2181 pr_warning("Preprocessing the %dth instance of program '%s' failed\n",
2182 i, prog->section_name);
2186 if (!result.new_insn_ptr || !result.new_insn_cnt) {
2187 pr_debug("Skip loading the %dth instance of program '%s'\n",
2188 i, prog->section_name);
2189 prog->instances.fds[i] = -1;
2195 err = load_program(prog, result.new_insn_ptr,
2196 result.new_insn_cnt,
2197 license, kern_version, &fd);
2200 pr_warning("Loading the %dth instance of program '%s' failed\n",
2201 i, prog->section_name);
2207 prog->instances.fds[i] = fd;
2211 pr_warning("failed to load program '%s'\n",
2212 prog->section_name);
2213 zfree(&prog->insns);
2214 prog->insns_cnt = 0;
2218 static bool bpf_program__is_function_storage(struct bpf_program *prog,
2219 struct bpf_object *obj)
2221 return prog->idx == obj->efile.text_shndx && obj->has_pseudo_calls;
2225 bpf_object__load_progs(struct bpf_object *obj)
2230 for (i = 0; i < obj->nr_programs; i++) {
2231 if (bpf_program__is_function_storage(&obj->programs[i], obj))
2233 err = bpf_program__load(&obj->programs[i],
2242 static bool bpf_prog_type__needs_kver(enum bpf_prog_type type)
2245 case BPF_PROG_TYPE_SOCKET_FILTER:
2246 case BPF_PROG_TYPE_SCHED_CLS:
2247 case BPF_PROG_TYPE_SCHED_ACT:
2248 case BPF_PROG_TYPE_XDP:
2249 case BPF_PROG_TYPE_CGROUP_SKB:
2250 case BPF_PROG_TYPE_CGROUP_SOCK:
2251 case BPF_PROG_TYPE_LWT_IN:
2252 case BPF_PROG_TYPE_LWT_OUT:
2253 case BPF_PROG_TYPE_LWT_XMIT:
2254 case BPF_PROG_TYPE_LWT_SEG6LOCAL:
2255 case BPF_PROG_TYPE_SOCK_OPS:
2256 case BPF_PROG_TYPE_SK_SKB:
2257 case BPF_PROG_TYPE_CGROUP_DEVICE:
2258 case BPF_PROG_TYPE_SK_MSG:
2259 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
2260 case BPF_PROG_TYPE_LIRC_MODE2:
2261 case BPF_PROG_TYPE_SK_REUSEPORT:
2262 case BPF_PROG_TYPE_FLOW_DISSECTOR:
2263 case BPF_PROG_TYPE_UNSPEC:
2264 case BPF_PROG_TYPE_TRACEPOINT:
2265 case BPF_PROG_TYPE_RAW_TRACEPOINT:
2266 case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
2267 case BPF_PROG_TYPE_PERF_EVENT:
2268 case BPF_PROG_TYPE_CGROUP_SYSCTL:
2270 case BPF_PROG_TYPE_KPROBE:
2276 static int bpf_object__validate(struct bpf_object *obj, bool needs_kver)
2278 if (needs_kver && obj->kern_version == 0) {
2279 pr_warning("%s doesn't provide kernel version\n",
2281 return -LIBBPF_ERRNO__KVERSION;
2286 static struct bpf_object *
2287 __bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz,
2288 bool needs_kver, int flags)
2290 struct bpf_object *obj;
2293 if (elf_version(EV_CURRENT) == EV_NONE) {
2294 pr_warning("failed to init libelf for %s\n", path);
2295 return ERR_PTR(-LIBBPF_ERRNO__LIBELF);
2298 obj = bpf_object__new(path, obj_buf, obj_buf_sz);
2302 CHECK_ERR(bpf_object__elf_init(obj), err, out);
2303 CHECK_ERR(bpf_object__check_endianness(obj), err, out);
2304 CHECK_ERR(bpf_object__probe_caps(obj), err, out);
2305 CHECK_ERR(bpf_object__elf_collect(obj, flags), err, out);
2306 CHECK_ERR(bpf_object__collect_reloc(obj), err, out);
2307 CHECK_ERR(bpf_object__validate(obj, needs_kver), err, out);
2309 bpf_object__elf_finish(obj);
2312 bpf_object__close(obj);
2313 return ERR_PTR(err);
2316 struct bpf_object *__bpf_object__open_xattr(struct bpf_object_open_attr *attr,
2319 /* param validation */
2323 pr_debug("loading %s\n", attr->file);
2325 return __bpf_object__open(attr->file, NULL, 0,
2326 bpf_prog_type__needs_kver(attr->prog_type),
2330 struct bpf_object *bpf_object__open_xattr(struct bpf_object_open_attr *attr)
2332 return __bpf_object__open_xattr(attr, 0);
2335 struct bpf_object *bpf_object__open(const char *path)
2337 struct bpf_object_open_attr attr = {
2339 .prog_type = BPF_PROG_TYPE_UNSPEC,
2342 return bpf_object__open_xattr(&attr);
2345 struct bpf_object *bpf_object__open_buffer(void *obj_buf,
2351 /* param validation */
2352 if (!obj_buf || obj_buf_sz <= 0)
2356 snprintf(tmp_name, sizeof(tmp_name), "%lx-%lx",
2357 (unsigned long)obj_buf,
2358 (unsigned long)obj_buf_sz);
2359 tmp_name[sizeof(tmp_name) - 1] = '\0';
2362 pr_debug("loading object '%s' from buffer\n",
2365 return __bpf_object__open(name, obj_buf, obj_buf_sz, true, true);
2368 int bpf_object__unload(struct bpf_object *obj)
2375 for (i = 0; i < obj->nr_maps; i++)
2376 zclose(obj->maps[i].fd);
2378 for (i = 0; i < obj->nr_programs; i++)
2379 bpf_program__unload(&obj->programs[i]);
2384 int bpf_object__load(struct bpf_object *obj)
2392 pr_warning("object should not be loaded twice\n");
2398 CHECK_ERR(bpf_object__create_maps(obj), err, out);
2399 CHECK_ERR(bpf_object__relocate(obj), err, out);
2400 CHECK_ERR(bpf_object__load_progs(obj), err, out);
2404 bpf_object__unload(obj);
2405 pr_warning("failed to load object '%s'\n", obj->path);
2409 static int check_path(const char *path)
2411 char *cp, errmsg[STRERR_BUFSIZE];
2412 struct statfs st_fs;
2419 dname = strdup(path);
2423 dir = dirname(dname);
2424 if (statfs(dir, &st_fs)) {
2425 cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg));
2426 pr_warning("failed to statfs %s: %s\n", dir, cp);
2431 if (!err && st_fs.f_type != BPF_FS_MAGIC) {
2432 pr_warning("specified path %s is not on BPF FS\n", path);
2439 int bpf_program__pin_instance(struct bpf_program *prog, const char *path,
2442 char *cp, errmsg[STRERR_BUFSIZE];
2445 err = check_path(path);
2450 pr_warning("invalid program pointer\n");
2454 if (instance < 0 || instance >= prog->instances.nr) {
2455 pr_warning("invalid prog instance %d of prog %s (max %d)\n",
2456 instance, prog->section_name, prog->instances.nr);
2460 if (bpf_obj_pin(prog->instances.fds[instance], path)) {
2461 cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg));
2462 pr_warning("failed to pin program: %s\n", cp);
2465 pr_debug("pinned program '%s'\n", path);
2470 int bpf_program__unpin_instance(struct bpf_program *prog, const char *path,
2475 err = check_path(path);
2480 pr_warning("invalid program pointer\n");
2484 if (instance < 0 || instance >= prog->instances.nr) {
2485 pr_warning("invalid prog instance %d of prog %s (max %d)\n",
2486 instance, prog->section_name, prog->instances.nr);
2493 pr_debug("unpinned program '%s'\n", path);
2498 static int make_dir(const char *path)
2500 char *cp, errmsg[STRERR_BUFSIZE];
2503 if (mkdir(path, 0700) && errno != EEXIST)
2507 cp = libbpf_strerror_r(-err, errmsg, sizeof(errmsg));
2508 pr_warning("failed to mkdir %s: %s\n", path, cp);
2513 int bpf_program__pin(struct bpf_program *prog, const char *path)
2517 err = check_path(path);
2522 pr_warning("invalid program pointer\n");
2526 if (prog->instances.nr <= 0) {
2527 pr_warning("no instances of prog %s to pin\n",
2528 prog->section_name);
2532 if (prog->instances.nr == 1) {
2533 /* don't create subdirs when pinning single instance */
2534 return bpf_program__pin_instance(prog, path, 0);
2537 err = make_dir(path);
2541 for (i = 0; i < prog->instances.nr; i++) {
2545 len = snprintf(buf, PATH_MAX, "%s/%d", path, i);
2549 } else if (len >= PATH_MAX) {
2550 err = -ENAMETOOLONG;
2554 err = bpf_program__pin_instance(prog, buf, i);
2562 for (i = i - 1; i >= 0; i--) {
2566 len = snprintf(buf, PATH_MAX, "%s/%d", path, i);
2569 else if (len >= PATH_MAX)
2572 bpf_program__unpin_instance(prog, buf, i);
2580 int bpf_program__unpin(struct bpf_program *prog, const char *path)
2584 err = check_path(path);
2589 pr_warning("invalid program pointer\n");
2593 if (prog->instances.nr <= 0) {
2594 pr_warning("no instances of prog %s to pin\n",
2595 prog->section_name);
2599 if (prog->instances.nr == 1) {
2600 /* don't create subdirs when pinning single instance */
2601 return bpf_program__unpin_instance(prog, path, 0);
2604 for (i = 0; i < prog->instances.nr; i++) {
2608 len = snprintf(buf, PATH_MAX, "%s/%d", path, i);
2611 else if (len >= PATH_MAX)
2612 return -ENAMETOOLONG;
2614 err = bpf_program__unpin_instance(prog, buf, i);
2626 int bpf_map__pin(struct bpf_map *map, const char *path)
2628 char *cp, errmsg[STRERR_BUFSIZE];
2631 err = check_path(path);
2636 pr_warning("invalid map pointer\n");
2640 if (bpf_obj_pin(map->fd, path)) {
2641 cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg));
2642 pr_warning("failed to pin map: %s\n", cp);
2646 pr_debug("pinned map '%s'\n", path);
2651 int bpf_map__unpin(struct bpf_map *map, const char *path)
2655 err = check_path(path);
2660 pr_warning("invalid map pointer\n");
2667 pr_debug("unpinned map '%s'\n", path);
2672 int bpf_object__pin_maps(struct bpf_object *obj, const char *path)
2674 struct bpf_map *map;
2681 pr_warning("object not yet loaded; load it first\n");
2685 err = make_dir(path);
2689 bpf_object__for_each_map(map, obj) {
2693 len = snprintf(buf, PATH_MAX, "%s/%s", path,
2694 bpf_map__name(map));
2697 goto err_unpin_maps;
2698 } else if (len >= PATH_MAX) {
2699 err = -ENAMETOOLONG;
2700 goto err_unpin_maps;
2703 err = bpf_map__pin(map, buf);
2705 goto err_unpin_maps;
2711 while ((map = bpf_map__prev(map, obj))) {
2715 len = snprintf(buf, PATH_MAX, "%s/%s", path,
2716 bpf_map__name(map));
2719 else if (len >= PATH_MAX)
2722 bpf_map__unpin(map, buf);
2728 int bpf_object__unpin_maps(struct bpf_object *obj, const char *path)
2730 struct bpf_map *map;
2736 bpf_object__for_each_map(map, obj) {
2740 len = snprintf(buf, PATH_MAX, "%s/%s", path,
2741 bpf_map__name(map));
2744 else if (len >= PATH_MAX)
2745 return -ENAMETOOLONG;
2747 err = bpf_map__unpin(map, buf);
2755 int bpf_object__pin_programs(struct bpf_object *obj, const char *path)
2757 struct bpf_program *prog;
2764 pr_warning("object not yet loaded; load it first\n");
2768 err = make_dir(path);
2772 bpf_object__for_each_program(prog, obj) {
2776 len = snprintf(buf, PATH_MAX, "%s/%s", path,
2780 goto err_unpin_programs;
2781 } else if (len >= PATH_MAX) {
2782 err = -ENAMETOOLONG;
2783 goto err_unpin_programs;
2786 err = bpf_program__pin(prog, buf);
2788 goto err_unpin_programs;
2794 while ((prog = bpf_program__prev(prog, obj))) {
2798 len = snprintf(buf, PATH_MAX, "%s/%s", path,
2802 else if (len >= PATH_MAX)
2805 bpf_program__unpin(prog, buf);
2811 int bpf_object__unpin_programs(struct bpf_object *obj, const char *path)
2813 struct bpf_program *prog;
2819 bpf_object__for_each_program(prog, obj) {
2823 len = snprintf(buf, PATH_MAX, "%s/%s", path,
2827 else if (len >= PATH_MAX)
2828 return -ENAMETOOLONG;
2830 err = bpf_program__unpin(prog, buf);
2838 int bpf_object__pin(struct bpf_object *obj, const char *path)
2842 err = bpf_object__pin_maps(obj, path);
2846 err = bpf_object__pin_programs(obj, path);
2848 bpf_object__unpin_maps(obj, path);
2855 void bpf_object__close(struct bpf_object *obj)
2862 if (obj->clear_priv)
2863 obj->clear_priv(obj, obj->priv);
2865 bpf_object__elf_finish(obj);
2866 bpf_object__unload(obj);
2867 btf__free(obj->btf);
2868 btf_ext__free(obj->btf_ext);
2870 for (i = 0; i < obj->nr_maps; i++) {
2871 zfree(&obj->maps[i].name);
2872 if (obj->maps[i].clear_priv)
2873 obj->maps[i].clear_priv(&obj->maps[i],
2875 obj->maps[i].priv = NULL;
2876 obj->maps[i].clear_priv = NULL;
2879 zfree(&obj->sections.rodata);
2880 zfree(&obj->sections.data);
2884 if (obj->programs && obj->nr_programs) {
2885 for (i = 0; i < obj->nr_programs; i++)
2886 bpf_program__exit(&obj->programs[i]);
2888 zfree(&obj->programs);
2890 list_del(&obj->list);
2895 bpf_object__next(struct bpf_object *prev)
2897 struct bpf_object *next;
2900 next = list_first_entry(&bpf_objects_list,
2904 next = list_next_entry(prev, list);
2906 /* Empty list is noticed here so don't need checking on entry. */
2907 if (&next->list == &bpf_objects_list)
2913 const char *bpf_object__name(struct bpf_object *obj)
2915 return obj ? obj->path : ERR_PTR(-EINVAL);
2918 unsigned int bpf_object__kversion(struct bpf_object *obj)
2920 return obj ? obj->kern_version : 0;
2923 struct btf *bpf_object__btf(struct bpf_object *obj)
2925 return obj ? obj->btf : NULL;
2928 int bpf_object__btf_fd(const struct bpf_object *obj)
2930 return obj->btf ? btf__fd(obj->btf) : -1;
2933 int bpf_object__set_priv(struct bpf_object *obj, void *priv,
2934 bpf_object_clear_priv_t clear_priv)
2936 if (obj->priv && obj->clear_priv)
2937 obj->clear_priv(obj, obj->priv);
2940 obj->clear_priv = clear_priv;
2944 void *bpf_object__priv(struct bpf_object *obj)
2946 return obj ? obj->priv : ERR_PTR(-EINVAL);
2949 static struct bpf_program *
2950 __bpf_program__iter(struct bpf_program *p, struct bpf_object *obj, bool forward)
2952 size_t nr_programs = obj->nr_programs;
2959 /* Iter from the beginning */
2960 return forward ? &obj->programs[0] :
2961 &obj->programs[nr_programs - 1];
2963 if (p->obj != obj) {
2964 pr_warning("error: program handler doesn't match object\n");
2968 idx = (p - obj->programs) + (forward ? 1 : -1);
2969 if (idx >= obj->nr_programs || idx < 0)
2971 return &obj->programs[idx];
2974 struct bpf_program *
2975 bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
2977 struct bpf_program *prog = prev;
2980 prog = __bpf_program__iter(prog, obj, true);
2981 } while (prog && bpf_program__is_function_storage(prog, obj));
2986 struct bpf_program *
2987 bpf_program__prev(struct bpf_program *next, struct bpf_object *obj)
2989 struct bpf_program *prog = next;
2992 prog = __bpf_program__iter(prog, obj, false);
2993 } while (prog && bpf_program__is_function_storage(prog, obj));
2998 int bpf_program__set_priv(struct bpf_program *prog, void *priv,
2999 bpf_program_clear_priv_t clear_priv)
3001 if (prog->priv && prog->clear_priv)
3002 prog->clear_priv(prog, prog->priv);
3005 prog->clear_priv = clear_priv;
3009 void *bpf_program__priv(struct bpf_program *prog)
3011 return prog ? prog->priv : ERR_PTR(-EINVAL);
3014 void bpf_program__set_ifindex(struct bpf_program *prog, __u32 ifindex)
3016 prog->prog_ifindex = ifindex;
3019 const char *bpf_program__title(struct bpf_program *prog, bool needs_copy)
3023 title = prog->section_name;
3025 title = strdup(title);
3027 pr_warning("failed to strdup program title\n");
3028 return ERR_PTR(-ENOMEM);
3035 int bpf_program__fd(struct bpf_program *prog)
3037 return bpf_program__nth_fd(prog, 0);
3040 int bpf_program__set_prep(struct bpf_program *prog, int nr_instances,
3041 bpf_program_prep_t prep)
3045 if (nr_instances <= 0 || !prep)
3048 if (prog->instances.nr > 0 || prog->instances.fds) {
3049 pr_warning("Can't set pre-processor after loading\n");
3053 instances_fds = malloc(sizeof(int) * nr_instances);
3054 if (!instances_fds) {
3055 pr_warning("alloc memory failed for fds\n");
3059 /* fill all fd with -1 */
3060 memset(instances_fds, -1, sizeof(int) * nr_instances);
3062 prog->instances.nr = nr_instances;
3063 prog->instances.fds = instances_fds;
3064 prog->preprocessor = prep;
3068 int bpf_program__nth_fd(struct bpf_program *prog, int n)
3075 if (n >= prog->instances.nr || n < 0) {
3076 pr_warning("Can't get the %dth fd from program %s: only %d instances\n",
3077 n, prog->section_name, prog->instances.nr);
3081 fd = prog->instances.fds[n];
3083 pr_warning("%dth instance of program '%s' is invalid\n",
3084 n, prog->section_name);
3091 void bpf_program__set_type(struct bpf_program *prog, enum bpf_prog_type type)
3096 static bool bpf_program__is_type(struct bpf_program *prog,
3097 enum bpf_prog_type type)
3099 return prog ? (prog->type == type) : false;
3102 #define BPF_PROG_TYPE_FNS(NAME, TYPE) \
3103 int bpf_program__set_##NAME(struct bpf_program *prog) \
3107 bpf_program__set_type(prog, TYPE); \
3111 bool bpf_program__is_##NAME(struct bpf_program *prog) \
3113 return bpf_program__is_type(prog, TYPE); \
3116 BPF_PROG_TYPE_FNS(socket_filter, BPF_PROG_TYPE_SOCKET_FILTER);
3117 BPF_PROG_TYPE_FNS(kprobe, BPF_PROG_TYPE_KPROBE);
3118 BPF_PROG_TYPE_FNS(sched_cls, BPF_PROG_TYPE_SCHED_CLS);
3119 BPF_PROG_TYPE_FNS(sched_act, BPF_PROG_TYPE_SCHED_ACT);
3120 BPF_PROG_TYPE_FNS(tracepoint, BPF_PROG_TYPE_TRACEPOINT);
3121 BPF_PROG_TYPE_FNS(raw_tracepoint, BPF_PROG_TYPE_RAW_TRACEPOINT);
3122 BPF_PROG_TYPE_FNS(xdp, BPF_PROG_TYPE_XDP);
3123 BPF_PROG_TYPE_FNS(perf_event, BPF_PROG_TYPE_PERF_EVENT);
3125 void bpf_program__set_expected_attach_type(struct bpf_program *prog,
3126 enum bpf_attach_type type)
3128 prog->expected_attach_type = type;
3131 #define BPF_PROG_SEC_IMPL(string, ptype, eatype, is_attachable, atype) \
3132 { string, sizeof(string) - 1, ptype, eatype, is_attachable, atype }
3134 /* Programs that can NOT be attached. */
3135 #define BPF_PROG_SEC(string, ptype) BPF_PROG_SEC_IMPL(string, ptype, 0, 0, 0)
3137 /* Programs that can be attached. */
3138 #define BPF_APROG_SEC(string, ptype, atype) \
3139 BPF_PROG_SEC_IMPL(string, ptype, 0, 1, atype)
3141 /* Programs that must specify expected attach type at load time. */
3142 #define BPF_EAPROG_SEC(string, ptype, eatype) \
3143 BPF_PROG_SEC_IMPL(string, ptype, eatype, 1, eatype)
3145 /* Programs that can be attached but attach type can't be identified by section
3146 * name. Kept for backward compatibility.
3148 #define BPF_APROG_COMPAT(string, ptype) BPF_PROG_SEC(string, ptype)
3150 static const struct {
3153 enum bpf_prog_type prog_type;
3154 enum bpf_attach_type expected_attach_type;
3156 enum bpf_attach_type attach_type;
3157 } section_names[] = {
3158 BPF_PROG_SEC("socket", BPF_PROG_TYPE_SOCKET_FILTER),
3159 BPF_PROG_SEC("kprobe/", BPF_PROG_TYPE_KPROBE),
3160 BPF_PROG_SEC("kretprobe/", BPF_PROG_TYPE_KPROBE),
3161 BPF_PROG_SEC("classifier", BPF_PROG_TYPE_SCHED_CLS),
3162 BPF_PROG_SEC("action", BPF_PROG_TYPE_SCHED_ACT),
3163 BPF_PROG_SEC("tracepoint/", BPF_PROG_TYPE_TRACEPOINT),
3164 BPF_PROG_SEC("raw_tracepoint/", BPF_PROG_TYPE_RAW_TRACEPOINT),
3165 BPF_PROG_SEC("xdp", BPF_PROG_TYPE_XDP),
3166 BPF_PROG_SEC("perf_event", BPF_PROG_TYPE_PERF_EVENT),
3167 BPF_PROG_SEC("lwt_in", BPF_PROG_TYPE_LWT_IN),
3168 BPF_PROG_SEC("lwt_out", BPF_PROG_TYPE_LWT_OUT),
3169 BPF_PROG_SEC("lwt_xmit", BPF_PROG_TYPE_LWT_XMIT),
3170 BPF_PROG_SEC("lwt_seg6local", BPF_PROG_TYPE_LWT_SEG6LOCAL),
3171 BPF_APROG_SEC("cgroup_skb/ingress", BPF_PROG_TYPE_CGROUP_SKB,
3172 BPF_CGROUP_INET_INGRESS),
3173 BPF_APROG_SEC("cgroup_skb/egress", BPF_PROG_TYPE_CGROUP_SKB,
3174 BPF_CGROUP_INET_EGRESS),
3175 BPF_APROG_COMPAT("cgroup/skb", BPF_PROG_TYPE_CGROUP_SKB),
3176 BPF_APROG_SEC("cgroup/sock", BPF_PROG_TYPE_CGROUP_SOCK,
3177 BPF_CGROUP_INET_SOCK_CREATE),
3178 BPF_EAPROG_SEC("cgroup/post_bind4", BPF_PROG_TYPE_CGROUP_SOCK,
3179 BPF_CGROUP_INET4_POST_BIND),
3180 BPF_EAPROG_SEC("cgroup/post_bind6", BPF_PROG_TYPE_CGROUP_SOCK,
3181 BPF_CGROUP_INET6_POST_BIND),
3182 BPF_APROG_SEC("cgroup/dev", BPF_PROG_TYPE_CGROUP_DEVICE,
3184 BPF_APROG_SEC("sockops", BPF_PROG_TYPE_SOCK_OPS,
3185 BPF_CGROUP_SOCK_OPS),
3186 BPF_APROG_SEC("sk_skb/stream_parser", BPF_PROG_TYPE_SK_SKB,
3187 BPF_SK_SKB_STREAM_PARSER),
3188 BPF_APROG_SEC("sk_skb/stream_verdict", BPF_PROG_TYPE_SK_SKB,
3189 BPF_SK_SKB_STREAM_VERDICT),
3190 BPF_APROG_COMPAT("sk_skb", BPF_PROG_TYPE_SK_SKB),
3191 BPF_APROG_SEC("sk_msg", BPF_PROG_TYPE_SK_MSG,
3192 BPF_SK_MSG_VERDICT),
3193 BPF_APROG_SEC("lirc_mode2", BPF_PROG_TYPE_LIRC_MODE2,
3195 BPF_APROG_SEC("flow_dissector", BPF_PROG_TYPE_FLOW_DISSECTOR,
3196 BPF_FLOW_DISSECTOR),
3197 BPF_EAPROG_SEC("cgroup/bind4", BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
3198 BPF_CGROUP_INET4_BIND),
3199 BPF_EAPROG_SEC("cgroup/bind6", BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
3200 BPF_CGROUP_INET6_BIND),
3201 BPF_EAPROG_SEC("cgroup/connect4", BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
3202 BPF_CGROUP_INET4_CONNECT),
3203 BPF_EAPROG_SEC("cgroup/connect6", BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
3204 BPF_CGROUP_INET6_CONNECT),
3205 BPF_EAPROG_SEC("cgroup/sendmsg4", BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
3206 BPF_CGROUP_UDP4_SENDMSG),
3207 BPF_EAPROG_SEC("cgroup/sendmsg6", BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
3208 BPF_CGROUP_UDP6_SENDMSG),
3209 BPF_EAPROG_SEC("cgroup/sysctl", BPF_PROG_TYPE_CGROUP_SYSCTL,
3213 #undef BPF_PROG_SEC_IMPL
3215 #undef BPF_APROG_SEC
3216 #undef BPF_EAPROG_SEC
3217 #undef BPF_APROG_COMPAT
3219 #define MAX_TYPE_NAME_SIZE 32
3221 static char *libbpf_get_type_names(bool attach_type)
3223 int i, len = ARRAY_SIZE(section_names) * MAX_TYPE_NAME_SIZE;
3231 /* Forge string buf with all available names */
3232 for (i = 0; i < ARRAY_SIZE(section_names); i++) {
3233 if (attach_type && !section_names[i].is_attachable)
3236 if (strlen(buf) + strlen(section_names[i].sec) + 2 > len) {
3241 strcat(buf, section_names[i].sec);
3247 int libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
3248 enum bpf_attach_type *expected_attach_type)
3256 for (i = 0; i < ARRAY_SIZE(section_names); i++) {
3257 if (strncmp(name, section_names[i].sec, section_names[i].len))
3259 *prog_type = section_names[i].prog_type;
3260 *expected_attach_type = section_names[i].expected_attach_type;
3263 pr_warning("failed to guess program type based on ELF section name '%s'\n", name);
3264 type_names = libbpf_get_type_names(false);
3265 if (type_names != NULL) {
3266 pr_info("supported section(type) names are:%s\n", type_names);
3273 int libbpf_attach_type_by_name(const char *name,
3274 enum bpf_attach_type *attach_type)
3282 for (i = 0; i < ARRAY_SIZE(section_names); i++) {
3283 if (strncmp(name, section_names[i].sec, section_names[i].len))
3285 if (!section_names[i].is_attachable)
3287 *attach_type = section_names[i].attach_type;
3290 pr_warning("failed to guess attach type based on ELF section name '%s'\n", name);
3291 type_names = libbpf_get_type_names(true);
3292 if (type_names != NULL) {
3293 pr_info("attachable section(type) names are:%s\n", type_names);
3301 bpf_program__identify_section(struct bpf_program *prog,
3302 enum bpf_prog_type *prog_type,
3303 enum bpf_attach_type *expected_attach_type)
3305 return libbpf_prog_type_by_name(prog->section_name, prog_type,
3306 expected_attach_type);
3309 int bpf_map__fd(struct bpf_map *map)
3311 return map ? map->fd : -EINVAL;
3314 const struct bpf_map_def *bpf_map__def(struct bpf_map *map)
3316 return map ? &map->def : ERR_PTR(-EINVAL);
3319 const char *bpf_map__name(struct bpf_map *map)
3321 return map ? map->name : NULL;
3324 __u32 bpf_map__btf_key_type_id(const struct bpf_map *map)
3326 return map ? map->btf_key_type_id : 0;
3329 __u32 bpf_map__btf_value_type_id(const struct bpf_map *map)
3331 return map ? map->btf_value_type_id : 0;
3334 int bpf_map__set_priv(struct bpf_map *map, void *priv,
3335 bpf_map_clear_priv_t clear_priv)
3341 if (map->clear_priv)
3342 map->clear_priv(map, map->priv);
3346 map->clear_priv = clear_priv;
3350 void *bpf_map__priv(struct bpf_map *map)
3352 return map ? map->priv : ERR_PTR(-EINVAL);
3355 bool bpf_map__is_offload_neutral(struct bpf_map *map)
3357 return map->def.type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
3360 bool bpf_map__is_internal(struct bpf_map *map)
3362 return map->libbpf_type != LIBBPF_MAP_UNSPEC;
3365 void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex)
3367 map->map_ifindex = ifindex;
3370 int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd)
3372 if (!bpf_map_type__is_map_in_map(map->def.type)) {
3373 pr_warning("error: unsupported map type\n");
3376 if (map->inner_map_fd != -1) {
3377 pr_warning("error: inner_map_fd already specified\n");
3380 map->inner_map_fd = fd;
3384 static struct bpf_map *
3385 __bpf_map__iter(struct bpf_map *m, struct bpf_object *obj, int i)
3388 struct bpf_map *s, *e;
3390 if (!obj || !obj->maps)
3394 e = obj->maps + obj->nr_maps;
3396 if ((m < s) || (m >= e)) {
3397 pr_warning("error in %s: map handler doesn't belong to object\n",
3402 idx = (m - obj->maps) + i;
3403 if (idx >= obj->nr_maps || idx < 0)
3405 return &obj->maps[idx];
3409 bpf_map__next(struct bpf_map *prev, struct bpf_object *obj)
3414 return __bpf_map__iter(prev, obj, 1);
3418 bpf_map__prev(struct bpf_map *next, struct bpf_object *obj)
3423 return obj->maps + obj->nr_maps - 1;
3426 return __bpf_map__iter(next, obj, -1);
3430 bpf_object__find_map_by_name(struct bpf_object *obj, const char *name)
3432 struct bpf_map *pos;
3434 bpf_object__for_each_map(pos, obj) {
3435 if (pos->name && !strcmp(pos->name, name))
3442 bpf_object__find_map_fd_by_name(struct bpf_object *obj, const char *name)
3444 return bpf_map__fd(bpf_object__find_map_by_name(obj, name));
3448 bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset)
3452 for (i = 0; i < obj->nr_maps; i++) {
3453 if (obj->maps[i].offset == offset)
3454 return &obj->maps[i];
3456 return ERR_PTR(-ENOENT);
3459 long libbpf_get_error(const void *ptr)
3462 return PTR_ERR(ptr);
3466 int bpf_prog_load(const char *file, enum bpf_prog_type type,
3467 struct bpf_object **pobj, int *prog_fd)
3469 struct bpf_prog_load_attr attr;
3471 memset(&attr, 0, sizeof(struct bpf_prog_load_attr));
3473 attr.prog_type = type;
3474 attr.expected_attach_type = 0;
3476 return bpf_prog_load_xattr(&attr, pobj, prog_fd);
3479 int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
3480 struct bpf_object **pobj, int *prog_fd)
3482 struct bpf_object_open_attr open_attr = {
3484 .prog_type = attr->prog_type,
3486 struct bpf_program *prog, *first_prog = NULL;
3487 enum bpf_attach_type expected_attach_type;
3488 enum bpf_prog_type prog_type;
3489 struct bpf_object *obj;
3490 struct bpf_map *map;
3498 obj = bpf_object__open_xattr(&open_attr);
3499 if (IS_ERR_OR_NULL(obj))
3502 bpf_object__for_each_program(prog, obj) {
3504 * If type is not specified, try to guess it based on
3507 prog_type = attr->prog_type;
3508 prog->prog_ifindex = attr->ifindex;
3509 expected_attach_type = attr->expected_attach_type;
3510 if (prog_type == BPF_PROG_TYPE_UNSPEC) {
3511 err = bpf_program__identify_section(prog, &prog_type,
3512 &expected_attach_type);
3514 bpf_object__close(obj);
3519 bpf_program__set_type(prog, prog_type);
3520 bpf_program__set_expected_attach_type(prog,
3521 expected_attach_type);
3523 prog->log_level = attr->log_level;
3528 bpf_object__for_each_map(map, obj) {
3529 if (!bpf_map__is_offload_neutral(map))
3530 map->map_ifindex = attr->ifindex;
3534 pr_warning("object file doesn't contain bpf program\n");
3535 bpf_object__close(obj);
3539 err = bpf_object__load(obj);
3541 bpf_object__close(obj);
3546 *prog_fd = bpf_program__fd(first_prog);
3550 enum bpf_perf_event_ret
3551 bpf_perf_event_read_simple(void *mmap_mem, size_t mmap_size, size_t page_size,
3552 void **copy_mem, size_t *copy_size,
3553 bpf_perf_event_print_t fn, void *private_data)
3555 struct perf_event_mmap_page *header = mmap_mem;
3556 __u64 data_head = ring_buffer_read_head(header);
3557 __u64 data_tail = header->data_tail;
3558 void *base = ((__u8 *)header) + page_size;
3559 int ret = LIBBPF_PERF_EVENT_CONT;
3560 struct perf_event_header *ehdr;
3563 while (data_head != data_tail) {
3564 ehdr = base + (data_tail & (mmap_size - 1));
3565 ehdr_size = ehdr->size;
3567 if (((void *)ehdr) + ehdr_size > base + mmap_size) {
3568 void *copy_start = ehdr;
3569 size_t len_first = base + mmap_size - copy_start;
3570 size_t len_secnd = ehdr_size - len_first;
3572 if (*copy_size < ehdr_size) {
3574 *copy_mem = malloc(ehdr_size);
3577 ret = LIBBPF_PERF_EVENT_ERROR;
3580 *copy_size = ehdr_size;
3583 memcpy(*copy_mem, copy_start, len_first);
3584 memcpy(*copy_mem + len_first, base, len_secnd);
3588 ret = fn(ehdr, private_data);
3589 data_tail += ehdr_size;
3590 if (ret != LIBBPF_PERF_EVENT_CONT)
3594 ring_buffer_write_tail(header, data_tail);
3598 struct bpf_prog_info_array_desc {
3599 int array_offset; /* e.g. offset of jited_prog_insns */
3600 int count_offset; /* e.g. offset of jited_prog_len */
3601 int size_offset; /* > 0: offset of rec size,
3602 * < 0: fix size of -size_offset
3606 static struct bpf_prog_info_array_desc bpf_prog_info_array_desc[] = {
3607 [BPF_PROG_INFO_JITED_INSNS] = {
3608 offsetof(struct bpf_prog_info, jited_prog_insns),
3609 offsetof(struct bpf_prog_info, jited_prog_len),
3612 [BPF_PROG_INFO_XLATED_INSNS] = {
3613 offsetof(struct bpf_prog_info, xlated_prog_insns),
3614 offsetof(struct bpf_prog_info, xlated_prog_len),
3617 [BPF_PROG_INFO_MAP_IDS] = {
3618 offsetof(struct bpf_prog_info, map_ids),
3619 offsetof(struct bpf_prog_info, nr_map_ids),
3620 -(int)sizeof(__u32),
3622 [BPF_PROG_INFO_JITED_KSYMS] = {
3623 offsetof(struct bpf_prog_info, jited_ksyms),
3624 offsetof(struct bpf_prog_info, nr_jited_ksyms),
3625 -(int)sizeof(__u64),
3627 [BPF_PROG_INFO_JITED_FUNC_LENS] = {
3628 offsetof(struct bpf_prog_info, jited_func_lens),
3629 offsetof(struct bpf_prog_info, nr_jited_func_lens),
3630 -(int)sizeof(__u32),
3632 [BPF_PROG_INFO_FUNC_INFO] = {
3633 offsetof(struct bpf_prog_info, func_info),
3634 offsetof(struct bpf_prog_info, nr_func_info),
3635 offsetof(struct bpf_prog_info, func_info_rec_size),
3637 [BPF_PROG_INFO_LINE_INFO] = {
3638 offsetof(struct bpf_prog_info, line_info),
3639 offsetof(struct bpf_prog_info, nr_line_info),
3640 offsetof(struct bpf_prog_info, line_info_rec_size),
3642 [BPF_PROG_INFO_JITED_LINE_INFO] = {
3643 offsetof(struct bpf_prog_info, jited_line_info),
3644 offsetof(struct bpf_prog_info, nr_jited_line_info),
3645 offsetof(struct bpf_prog_info, jited_line_info_rec_size),
3647 [BPF_PROG_INFO_PROG_TAGS] = {
3648 offsetof(struct bpf_prog_info, prog_tags),
3649 offsetof(struct bpf_prog_info, nr_prog_tags),
3650 -(int)sizeof(__u8) * BPF_TAG_SIZE,
3655 static __u32 bpf_prog_info_read_offset_u32(struct bpf_prog_info *info, int offset)
3657 __u32 *array = (__u32 *)info;
3660 return array[offset / sizeof(__u32)];
3661 return -(int)offset;
3664 static __u64 bpf_prog_info_read_offset_u64(struct bpf_prog_info *info, int offset)
3666 __u64 *array = (__u64 *)info;
3669 return array[offset / sizeof(__u64)];
3670 return -(int)offset;
3673 static void bpf_prog_info_set_offset_u32(struct bpf_prog_info *info, int offset,
3676 __u32 *array = (__u32 *)info;
3679 array[offset / sizeof(__u32)] = val;
3682 static void bpf_prog_info_set_offset_u64(struct bpf_prog_info *info, int offset,
3685 __u64 *array = (__u64 *)info;
3688 array[offset / sizeof(__u64)] = val;
3691 struct bpf_prog_info_linear *
3692 bpf_program__get_prog_info_linear(int fd, __u64 arrays)
3694 struct bpf_prog_info_linear *info_linear;
3695 struct bpf_prog_info info = {};
3696 __u32 info_len = sizeof(info);
3701 if (arrays >> BPF_PROG_INFO_LAST_ARRAY)
3702 return ERR_PTR(-EINVAL);
3704 /* step 1: get array dimensions */
3705 err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
3707 pr_debug("can't get prog info: %s", strerror(errno));
3708 return ERR_PTR(-EFAULT);
3711 /* step 2: calculate total size of all arrays */
3712 for (i = BPF_PROG_INFO_FIRST_ARRAY; i < BPF_PROG_INFO_LAST_ARRAY; ++i) {
3713 bool include_array = (arrays & (1UL << i)) > 0;
3714 struct bpf_prog_info_array_desc *desc;
3717 desc = bpf_prog_info_array_desc + i;
3719 /* kernel is too old to support this field */
3720 if (info_len < desc->array_offset + sizeof(__u32) ||
3721 info_len < desc->count_offset + sizeof(__u32) ||
3722 (desc->size_offset > 0 && info_len < desc->size_offset))
3723 include_array = false;
3725 if (!include_array) {
3726 arrays &= ~(1UL << i); /* clear the bit */
3730 count = bpf_prog_info_read_offset_u32(&info, desc->count_offset);
3731 size = bpf_prog_info_read_offset_u32(&info, desc->size_offset);
3733 data_len += count * size;
3736 /* step 3: allocate continuous memory */
3737 data_len = roundup(data_len, sizeof(__u64));
3738 info_linear = malloc(sizeof(struct bpf_prog_info_linear) + data_len);
3740 return ERR_PTR(-ENOMEM);
3742 /* step 4: fill data to info_linear->info */
3743 info_linear->arrays = arrays;
3744 memset(&info_linear->info, 0, sizeof(info));
3745 ptr = info_linear->data;
3747 for (i = BPF_PROG_INFO_FIRST_ARRAY; i < BPF_PROG_INFO_LAST_ARRAY; ++i) {
3748 struct bpf_prog_info_array_desc *desc;
3751 if ((arrays & (1UL << i)) == 0)
3754 desc = bpf_prog_info_array_desc + i;
3755 count = bpf_prog_info_read_offset_u32(&info, desc->count_offset);
3756 size = bpf_prog_info_read_offset_u32(&info, desc->size_offset);
3757 bpf_prog_info_set_offset_u32(&info_linear->info,
3758 desc->count_offset, count);
3759 bpf_prog_info_set_offset_u32(&info_linear->info,
3760 desc->size_offset, size);
3761 bpf_prog_info_set_offset_u64(&info_linear->info,
3764 ptr += count * size;
3767 /* step 5: call syscall again to get required arrays */
3768 err = bpf_obj_get_info_by_fd(fd, &info_linear->info, &info_len);
3770 pr_debug("can't get prog info: %s", strerror(errno));
3772 return ERR_PTR(-EFAULT);
3775 /* step 6: verify the data */
3776 for (i = BPF_PROG_INFO_FIRST_ARRAY; i < BPF_PROG_INFO_LAST_ARRAY; ++i) {
3777 struct bpf_prog_info_array_desc *desc;
3780 if ((arrays & (1UL << i)) == 0)
3783 desc = bpf_prog_info_array_desc + i;
3784 v1 = bpf_prog_info_read_offset_u32(&info, desc->count_offset);
3785 v2 = bpf_prog_info_read_offset_u32(&info_linear->info,
3786 desc->count_offset);
3788 pr_warning("%s: mismatch in element count\n", __func__);
3790 v1 = bpf_prog_info_read_offset_u32(&info, desc->size_offset);
3791 v2 = bpf_prog_info_read_offset_u32(&info_linear->info,
3794 pr_warning("%s: mismatch in rec size\n", __func__);
3797 /* step 7: update info_len and data_len */
3798 info_linear->info_len = sizeof(struct bpf_prog_info);
3799 info_linear->data_len = data_len;
3804 void bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear)
3808 for (i = BPF_PROG_INFO_FIRST_ARRAY; i < BPF_PROG_INFO_LAST_ARRAY; ++i) {
3809 struct bpf_prog_info_array_desc *desc;
3812 if ((info_linear->arrays & (1UL << i)) == 0)
3815 desc = bpf_prog_info_array_desc + i;
3816 addr = bpf_prog_info_read_offset_u64(&info_linear->info,
3817 desc->array_offset);
3818 offs = addr - ptr_to_u64(info_linear->data);
3819 bpf_prog_info_set_offset_u64(&info_linear->info,
3820 desc->array_offset, offs);
3824 void bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear)
3828 for (i = BPF_PROG_INFO_FIRST_ARRAY; i < BPF_PROG_INFO_LAST_ARRAY; ++i) {
3829 struct bpf_prog_info_array_desc *desc;
3832 if ((info_linear->arrays & (1UL << i)) == 0)
3835 desc = bpf_prog_info_array_desc + i;
3836 offs = bpf_prog_info_read_offset_u64(&info_linear->info,
3837 desc->array_offset);
3838 addr = offs + ptr_to_u64(info_linear->data);
3839 bpf_prog_info_set_offset_u64(&info_linear->info,
3840 desc->array_offset, addr);