1 // SPDX-License-Identifier: LGPL-2.1
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.
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation;
14 * version 2.1 of the License (not later!)
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this program; if not, see <http://www.gnu.org/licenses>
38 #include <asm/unistd.h>
39 #include <linux/err.h>
40 #include <linux/kernel.h>
41 #include <linux/bpf.h>
42 #include <linux/btf.h>
43 #include <linux/list.h>
44 #include <linux/limits.h>
46 #include <sys/types.h>
48 #include <tools/libc_compat.h>
55 #include "str_error.h"
62 #define BPF_FS_MAGIC 0xcafe4a11
65 #define __printf(a, b) __attribute__((format(printf, a, b)))
68 static int __base_pr(const char *format, ...)
73 va_start(args, format);
74 err = vfprintf(stderr, format, args);
79 static __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr;
80 static __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr;
81 static __printf(1, 2) libbpf_print_fn_t __pr_debug;
83 #define __pr(func, fmt, ...) \
86 (func)("libbpf: " fmt, ##__VA_ARGS__); \
89 #define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__)
90 #define pr_info(fmt, ...) __pr(__pr_info, fmt, ##__VA_ARGS__)
91 #define pr_debug(fmt, ...) __pr(__pr_debug, fmt, ##__VA_ARGS__)
93 void libbpf_set_print(libbpf_print_fn_t warn,
94 libbpf_print_fn_t info,
95 libbpf_print_fn_t debug)
102 #define STRERR_BUFSIZE 128
104 #define CHECK_ERR(action, err, out) do { \
111 /* Copied from tools/perf/util/util.h */
113 # define zfree(ptr) ({ free(*ptr); *ptr = NULL; })
117 # define zclose(fd) ({ \
120 ___err = close((fd)); \
125 #ifdef HAVE_LIBELF_MMAP_SUPPORT
126 # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ_MMAP
128 # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ
132 * bpf_prog should be a better name but it has been used in
136 /* Index in elf obj file, for relocation use. */
141 struct bpf_insn *insns;
142 size_t insns_cnt, main_prog_cnt;
143 enum bpf_prog_type type;
162 bpf_program_prep_t preprocessor;
164 struct bpf_object *obj;
166 bpf_program_clear_priv_t clear_priv;
168 enum bpf_attach_type expected_attach_type;
176 struct bpf_map_def def;
177 __u32 btf_key_type_id;
178 __u32 btf_value_type_id;
180 bpf_map_clear_priv_t clear_priv;
183 static LIST_HEAD(bpf_objects_list);
189 struct bpf_program *programs;
191 struct bpf_map *maps;
195 bool has_pseudo_calls;
198 * Information when doing elf related work. Only valid if fd
218 * All loaded bpf_object is linked in a list, which is
219 * hidden to caller. bpf_objects__<func> handlers deal with
222 struct list_head list;
227 bpf_object_clear_priv_t clear_priv;
231 #define obj_elf_valid(o) ((o)->efile.elf)
233 static void bpf_program__unload(struct bpf_program *prog)
241 * If the object is opened but the program was never loaded,
242 * it is possible that prog->instances.nr == -1.
244 if (prog->instances.nr > 0) {
245 for (i = 0; i < prog->instances.nr; i++)
246 zclose(prog->instances.fds[i]);
247 } else if (prog->instances.nr != -1) {
248 pr_warning("Internal error: instances.nr is %d\n",
252 prog->instances.nr = -1;
253 zfree(&prog->instances.fds);
256 static void bpf_program__exit(struct bpf_program *prog)
261 if (prog->clear_priv)
262 prog->clear_priv(prog, prog->priv);
265 prog->clear_priv = NULL;
267 bpf_program__unload(prog);
269 zfree(&prog->section_name);
271 zfree(&prog->reloc_desc);
279 bpf_program__init(void *data, size_t size, char *section_name, int idx,
280 struct bpf_program *prog)
282 if (size < sizeof(struct bpf_insn)) {
283 pr_warning("corrupted section '%s'\n", section_name);
287 bzero(prog, sizeof(*prog));
289 prog->section_name = strdup(section_name);
290 if (!prog->section_name) {
291 pr_warning("failed to alloc name for prog under section(%d) %s\n",
296 prog->insns = malloc(size);
298 pr_warning("failed to alloc insns for prog under section %s\n",
302 prog->insns_cnt = size / sizeof(struct bpf_insn);
303 memcpy(prog->insns, data,
304 prog->insns_cnt * sizeof(struct bpf_insn));
306 prog->instances.fds = NULL;
307 prog->instances.nr = -1;
308 prog->type = BPF_PROG_TYPE_KPROBE;
312 bpf_program__exit(prog);
317 bpf_object__add_program(struct bpf_object *obj, void *data, size_t size,
318 char *section_name, int idx)
320 struct bpf_program prog, *progs;
323 err = bpf_program__init(data, size, section_name, idx, &prog);
327 progs = obj->programs;
328 nr_progs = obj->nr_programs;
330 progs = reallocarray(progs, nr_progs + 1, sizeof(progs[0]));
333 * In this case the original obj->programs
334 * is still valid, so don't need special treat for
335 * bpf_close_object().
337 pr_warning("failed to alloc a new program under section '%s'\n",
339 bpf_program__exit(&prog);
343 pr_debug("found program %s\n", prog.section_name);
344 obj->programs = progs;
345 obj->nr_programs = nr_progs + 1;
347 progs[nr_progs] = prog;
352 bpf_object__init_prog_names(struct bpf_object *obj)
354 Elf_Data *symbols = obj->efile.symbols;
355 struct bpf_program *prog;
358 for (pi = 0; pi < obj->nr_programs; pi++) {
359 const char *name = NULL;
361 prog = &obj->programs[pi];
363 for (si = 0; si < symbols->d_size / sizeof(GElf_Sym) && !name;
367 if (!gelf_getsym(symbols, si, &sym))
369 if (sym.st_shndx != prog->idx)
371 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL)
374 name = elf_strptr(obj->efile.elf,
375 obj->efile.strtabidx,
378 pr_warning("failed to get sym name string for prog %s\n",
380 return -LIBBPF_ERRNO__LIBELF;
384 if (!name && prog->idx == obj->efile.text_shndx)
388 pr_warning("failed to find sym for prog %s\n",
393 prog->name = strdup(name);
395 pr_warning("failed to allocate memory for prog sym %s\n",
404 static struct bpf_object *bpf_object__new(const char *path,
408 struct bpf_object *obj;
410 obj = calloc(1, sizeof(struct bpf_object) + strlen(path) + 1);
412 pr_warning("alloc memory failed for %s\n", path);
413 return ERR_PTR(-ENOMEM);
416 strcpy(obj->path, path);
420 * Caller of this function should also calls
421 * bpf_object__elf_finish() after data collection to return
422 * obj_buf to user. If not, we should duplicate the buffer to
423 * avoid user freeing them before elf finish.
425 obj->efile.obj_buf = obj_buf;
426 obj->efile.obj_buf_sz = obj_buf_sz;
427 obj->efile.maps_shndx = -1;
431 INIT_LIST_HEAD(&obj->list);
432 list_add(&obj->list, &bpf_objects_list);
436 static void bpf_object__elf_finish(struct bpf_object *obj)
438 if (!obj_elf_valid(obj))
441 if (obj->efile.elf) {
442 elf_end(obj->efile.elf);
443 obj->efile.elf = NULL;
445 obj->efile.symbols = NULL;
447 zfree(&obj->efile.reloc);
448 obj->efile.nr_reloc = 0;
449 zclose(obj->efile.fd);
450 obj->efile.obj_buf = NULL;
451 obj->efile.obj_buf_sz = 0;
454 static int bpf_object__elf_init(struct bpf_object *obj)
459 if (obj_elf_valid(obj)) {
460 pr_warning("elf init: internal error\n");
461 return -LIBBPF_ERRNO__LIBELF;
464 if (obj->efile.obj_buf_sz > 0) {
466 * obj_buf should have been validated by
467 * bpf_object__open_buffer().
469 obj->efile.elf = elf_memory(obj->efile.obj_buf,
470 obj->efile.obj_buf_sz);
472 obj->efile.fd = open(obj->path, O_RDONLY);
473 if (obj->efile.fd < 0) {
474 char errmsg[STRERR_BUFSIZE];
475 char *cp = str_error(errno, errmsg, sizeof(errmsg));
477 pr_warning("failed to open %s: %s\n", obj->path, cp);
481 obj->efile.elf = elf_begin(obj->efile.fd,
482 LIBBPF_ELF_C_READ_MMAP,
486 if (!obj->efile.elf) {
487 pr_warning("failed to open %s as ELF file\n",
489 err = -LIBBPF_ERRNO__LIBELF;
493 if (!gelf_getehdr(obj->efile.elf, &obj->efile.ehdr)) {
494 pr_warning("failed to get EHDR from %s\n",
496 err = -LIBBPF_ERRNO__FORMAT;
499 ep = &obj->efile.ehdr;
501 /* Old LLVM set e_machine to EM_NONE */
502 if ((ep->e_type != ET_REL) || (ep->e_machine && (ep->e_machine != EM_BPF))) {
503 pr_warning("%s is not an eBPF object file\n",
505 err = -LIBBPF_ERRNO__FORMAT;
511 bpf_object__elf_finish(obj);
516 bpf_object__check_endianness(struct bpf_object *obj)
518 static unsigned int const endian = 1;
520 switch (obj->efile.ehdr.e_ident[EI_DATA]) {
522 /* We are big endian, BPF obj is little endian. */
523 if (*(unsigned char const *)&endian != 1)
528 /* We are little endian, BPF obj is big endian. */
529 if (*(unsigned char const *)&endian != 0)
533 return -LIBBPF_ERRNO__ENDIAN;
539 pr_warning("Error: endianness mismatch.\n");
540 return -LIBBPF_ERRNO__ENDIAN;
544 bpf_object__init_license(struct bpf_object *obj,
545 void *data, size_t size)
547 memcpy(obj->license, data,
548 min(size, sizeof(obj->license) - 1));
549 pr_debug("license of %s is %s\n", obj->path, obj->license);
554 bpf_object__init_kversion(struct bpf_object *obj,
555 void *data, size_t size)
559 if (size != sizeof(kver)) {
560 pr_warning("invalid kver section in %s\n", obj->path);
561 return -LIBBPF_ERRNO__FORMAT;
563 memcpy(&kver, data, sizeof(kver));
564 obj->kern_version = kver;
565 pr_debug("kernel version of %s is %x\n", obj->path,
570 static int compare_bpf_map(const void *_a, const void *_b)
572 const struct bpf_map *a = _a;
573 const struct bpf_map *b = _b;
575 return a->offset - b->offset;
579 bpf_object__init_maps(struct bpf_object *obj)
581 int i, map_idx, map_def_sz, nr_maps = 0;
584 Elf_Data *symbols = obj->efile.symbols;
586 if (obj->efile.maps_shndx < 0)
591 scn = elf_getscn(obj->efile.elf, obj->efile.maps_shndx);
593 data = elf_getdata(scn, NULL);
595 pr_warning("failed to get Elf_Data from map section %d\n",
596 obj->efile.maps_shndx);
601 * Count number of maps. Each map has a name.
602 * Array of maps is not supported: only the first element is
605 * TODO: Detect array of map and report error.
607 for (i = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) {
610 if (!gelf_getsym(symbols, i, &sym))
612 if (sym.st_shndx != obj->efile.maps_shndx)
617 /* Alloc obj->maps and fill nr_maps. */
618 pr_debug("maps in %s: %d maps in %zd bytes\n", obj->path,
619 nr_maps, data->d_size);
624 /* Assume equally sized map definitions */
625 map_def_sz = data->d_size / nr_maps;
626 if (!data->d_size || (data->d_size % nr_maps) != 0) {
627 pr_warning("unable to determine map definition size "
628 "section %s, %d maps in %zd bytes\n",
629 obj->path, nr_maps, data->d_size);
633 obj->maps = calloc(nr_maps, sizeof(obj->maps[0]));
635 pr_warning("alloc maps for object failed\n");
638 obj->nr_maps = nr_maps;
641 * fill all fd with -1 so won't close incorrect
642 * fd (fd=0 is stdin) when failure (zclose won't close
645 for (i = 0; i < nr_maps; i++)
646 obj->maps[i].fd = -1;
649 * Fill obj->maps using data in "maps" section.
651 for (i = 0, map_idx = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) {
653 const char *map_name;
654 struct bpf_map_def *def;
656 if (!gelf_getsym(symbols, i, &sym))
658 if (sym.st_shndx != obj->efile.maps_shndx)
661 map_name = elf_strptr(obj->efile.elf,
662 obj->efile.strtabidx,
664 obj->maps[map_idx].offset = sym.st_value;
665 if (sym.st_value + map_def_sz > data->d_size) {
666 pr_warning("corrupted maps section in %s: last map \"%s\" too small\n",
667 obj->path, map_name);
671 obj->maps[map_idx].name = strdup(map_name);
672 if (!obj->maps[map_idx].name) {
673 pr_warning("failed to alloc map name\n");
676 pr_debug("map %d is \"%s\"\n", map_idx,
677 obj->maps[map_idx].name);
678 def = (struct bpf_map_def *)(data->d_buf + sym.st_value);
680 * If the definition of the map in the object file fits in
681 * bpf_map_def, copy it. Any extra fields in our version
682 * of bpf_map_def will default to zero as a result of the
685 if (map_def_sz <= sizeof(struct bpf_map_def)) {
686 memcpy(&obj->maps[map_idx].def, def, map_def_sz);
689 * Here the map structure being read is bigger than what
690 * we expect, truncate if the excess bits are all zero.
691 * If they are not zero, reject this map as
695 for (b = ((char *)def) + sizeof(struct bpf_map_def);
696 b < ((char *)def) + map_def_sz; b++) {
698 pr_warning("maps section in %s: \"%s\" "
699 "has unrecognized, non-zero "
701 obj->path, map_name);
705 memcpy(&obj->maps[map_idx].def, def,
706 sizeof(struct bpf_map_def));
711 qsort(obj->maps, obj->nr_maps, sizeof(obj->maps[0]), compare_bpf_map);
715 static bool section_have_execinstr(struct bpf_object *obj, int idx)
720 scn = elf_getscn(obj->efile.elf, idx);
724 if (gelf_getshdr(scn, &sh) != &sh)
727 if (sh.sh_flags & SHF_EXECINSTR)
733 static int bpf_object__elf_collect(struct bpf_object *obj)
735 Elf *elf = obj->efile.elf;
736 GElf_Ehdr *ep = &obj->efile.ehdr;
738 int idx = 0, err = 0;
740 /* Elf is corrupted/truncated, avoid calling elf_strptr. */
741 if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) {
742 pr_warning("failed to get e_shstrndx from %s\n",
744 return -LIBBPF_ERRNO__FORMAT;
747 while ((scn = elf_nextscn(elf, scn)) != NULL) {
753 if (gelf_getshdr(scn, &sh) != &sh) {
754 pr_warning("failed to get section(%d) header from %s\n",
756 err = -LIBBPF_ERRNO__FORMAT;
760 name = elf_strptr(elf, ep->e_shstrndx, sh.sh_name);
762 pr_warning("failed to get section(%d) name from %s\n",
764 err = -LIBBPF_ERRNO__FORMAT;
768 data = elf_getdata(scn, 0);
770 pr_warning("failed to get section(%d) data from %s(%s)\n",
771 idx, name, obj->path);
772 err = -LIBBPF_ERRNO__FORMAT;
775 pr_debug("section(%d) %s, size %ld, link %d, flags %lx, type=%d\n",
776 idx, name, (unsigned long)data->d_size,
777 (int)sh.sh_link, (unsigned long)sh.sh_flags,
780 if (strcmp(name, "license") == 0)
781 err = bpf_object__init_license(obj,
784 else if (strcmp(name, "version") == 0)
785 err = bpf_object__init_kversion(obj,
788 else if (strcmp(name, "maps") == 0)
789 obj->efile.maps_shndx = idx;
790 else if (strcmp(name, BTF_ELF_SEC) == 0) {
791 obj->btf = btf__new(data->d_buf, data->d_size,
793 if (IS_ERR(obj->btf)) {
794 pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
795 BTF_ELF_SEC, PTR_ERR(obj->btf));
798 } else if (sh.sh_type == SHT_SYMTAB) {
799 if (obj->efile.symbols) {
800 pr_warning("bpf: multiple SYMTAB in %s\n",
802 err = -LIBBPF_ERRNO__FORMAT;
804 obj->efile.symbols = data;
805 obj->efile.strtabidx = sh.sh_link;
807 } else if ((sh.sh_type == SHT_PROGBITS) &&
808 (sh.sh_flags & SHF_EXECINSTR) &&
809 (data->d_size > 0)) {
810 if (strcmp(name, ".text") == 0)
811 obj->efile.text_shndx = idx;
812 err = bpf_object__add_program(obj, data->d_buf,
813 data->d_size, name, idx);
815 char errmsg[STRERR_BUFSIZE];
816 char *cp = str_error(-err, errmsg, sizeof(errmsg));
818 pr_warning("failed to alloc program %s (%s): %s",
819 name, obj->path, cp);
821 } else if (sh.sh_type == SHT_REL) {
822 void *reloc = obj->efile.reloc;
823 int nr_reloc = obj->efile.nr_reloc + 1;
824 int sec = sh.sh_info; /* points to other section */
826 /* Only do relo for section with exec instructions */
827 if (!section_have_execinstr(obj, sec)) {
828 pr_debug("skip relo %s(%d) for section(%d)\n",
833 reloc = reallocarray(reloc, nr_reloc,
834 sizeof(*obj->efile.reloc));
836 pr_warning("realloc failed\n");
839 int n = nr_reloc - 1;
841 obj->efile.reloc = reloc;
842 obj->efile.nr_reloc = nr_reloc;
844 obj->efile.reloc[n].shdr = sh;
845 obj->efile.reloc[n].data = data;
848 pr_debug("skip section(%d) %s\n", idx, name);
854 if (!obj->efile.strtabidx || obj->efile.strtabidx >= idx) {
855 pr_warning("Corrupted ELF file: index of strtab invalid\n");
856 return LIBBPF_ERRNO__FORMAT;
858 if (obj->efile.maps_shndx >= 0) {
859 err = bpf_object__init_maps(obj);
863 err = bpf_object__init_prog_names(obj);
868 static struct bpf_program *
869 bpf_object__find_prog_by_idx(struct bpf_object *obj, int idx)
871 struct bpf_program *prog;
874 for (i = 0; i < obj->nr_programs; i++) {
875 prog = &obj->programs[i];
876 if (prog->idx == idx)
883 bpf_object__find_program_by_title(struct bpf_object *obj, const char *title)
885 struct bpf_program *pos;
887 bpf_object__for_each_program(pos, obj) {
888 if (pos->section_name && !strcmp(pos->section_name, title))
895 bpf_program__collect_reloc(struct bpf_program *prog, GElf_Shdr *shdr,
896 Elf_Data *data, struct bpf_object *obj)
898 Elf_Data *symbols = obj->efile.symbols;
899 int text_shndx = obj->efile.text_shndx;
900 int maps_shndx = obj->efile.maps_shndx;
901 struct bpf_map *maps = obj->maps;
902 size_t nr_maps = obj->nr_maps;
905 pr_debug("collecting relocating info for: '%s'\n",
907 nrels = shdr->sh_size / shdr->sh_entsize;
909 prog->reloc_desc = malloc(sizeof(*prog->reloc_desc) * nrels);
910 if (!prog->reloc_desc) {
911 pr_warning("failed to alloc memory in relocation\n");
914 prog->nr_reloc = nrels;
916 for (i = 0; i < nrels; i++) {
919 unsigned int insn_idx;
920 struct bpf_insn *insns = prog->insns;
923 if (!gelf_getrel(data, i, &rel)) {
924 pr_warning("relocation: failed to get %d reloc\n", i);
925 return -LIBBPF_ERRNO__FORMAT;
928 if (!gelf_getsym(symbols,
929 GELF_R_SYM(rel.r_info),
931 pr_warning("relocation: symbol %"PRIx64" not found\n",
932 GELF_R_SYM(rel.r_info));
933 return -LIBBPF_ERRNO__FORMAT;
935 pr_debug("relo for %lld value %lld name %d\n",
936 (long long) (rel.r_info >> 32),
937 (long long) sym.st_value, sym.st_name);
939 if (sym.st_shndx != maps_shndx && sym.st_shndx != text_shndx) {
940 pr_warning("Program '%s' contains non-map related relo data pointing to section %u\n",
941 prog->section_name, sym.st_shndx);
942 return -LIBBPF_ERRNO__RELOC;
945 insn_idx = rel.r_offset / sizeof(struct bpf_insn);
946 pr_debug("relocation: insn_idx=%u\n", insn_idx);
948 if (insns[insn_idx].code == (BPF_JMP | BPF_CALL)) {
949 if (insns[insn_idx].src_reg != BPF_PSEUDO_CALL) {
950 pr_warning("incorrect bpf_call opcode\n");
951 return -LIBBPF_ERRNO__RELOC;
953 prog->reloc_desc[i].type = RELO_CALL;
954 prog->reloc_desc[i].insn_idx = insn_idx;
955 prog->reloc_desc[i].text_off = sym.st_value;
956 obj->has_pseudo_calls = true;
960 if (insns[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) {
961 pr_warning("bpf: relocation: invalid relo for insns[%d].code 0x%x\n",
962 insn_idx, insns[insn_idx].code);
963 return -LIBBPF_ERRNO__RELOC;
966 /* TODO: 'maps' is sorted. We can use bsearch to make it faster. */
967 for (map_idx = 0; map_idx < nr_maps; map_idx++) {
968 if (maps[map_idx].offset == sym.st_value) {
969 pr_debug("relocation: find map %zd (%s) for insn %u\n",
970 map_idx, maps[map_idx].name, insn_idx);
975 if (map_idx >= nr_maps) {
976 pr_warning("bpf relocation: map_idx %d large than %d\n",
977 (int)map_idx, (int)nr_maps - 1);
978 return -LIBBPF_ERRNO__RELOC;
981 prog->reloc_desc[i].type = RELO_LD64;
982 prog->reloc_desc[i].insn_idx = insn_idx;
983 prog->reloc_desc[i].map_idx = map_idx;
988 static int bpf_map_find_btf_info(struct bpf_map *map, const struct btf *btf)
990 const struct btf_type *container_type;
991 const struct btf_member *key, *value;
992 struct bpf_map_def *def = &map->def;
993 const size_t max_name = 256;
994 char container_name[max_name];
995 __s64 key_size, value_size;
998 if (snprintf(container_name, max_name, "____btf_map_%s", map->name) ==
1000 pr_warning("map:%s length of '____btf_map_%s' is too long\n",
1001 map->name, map->name);
1005 container_id = btf__find_by_name(btf, container_name);
1006 if (container_id < 0) {
1007 pr_debug("map:%s container_name:%s cannot be found in BTF. Missing BPF_ANNOTATE_KV_PAIR?\n",
1008 map->name, container_name);
1009 return container_id;
1012 container_type = btf__type_by_id(btf, container_id);
1013 if (!container_type) {
1014 pr_warning("map:%s cannot find BTF type for container_id:%u\n",
1015 map->name, container_id);
1019 if (BTF_INFO_KIND(container_type->info) != BTF_KIND_STRUCT ||
1020 BTF_INFO_VLEN(container_type->info) < 2) {
1021 pr_warning("map:%s container_name:%s is an invalid container struct\n",
1022 map->name, container_name);
1026 key = (struct btf_member *)(container_type + 1);
1029 key_size = btf__resolve_size(btf, key->type);
1031 pr_warning("map:%s invalid BTF key_type_size\n",
1036 if (def->key_size != key_size) {
1037 pr_warning("map:%s btf_key_type_size:%u != map_def_key_size:%u\n",
1038 map->name, (__u32)key_size, def->key_size);
1042 value_size = btf__resolve_size(btf, value->type);
1043 if (value_size < 0) {
1044 pr_warning("map:%s invalid BTF value_type_size\n", map->name);
1048 if (def->value_size != value_size) {
1049 pr_warning("map:%s btf_value_type_size:%u != map_def_value_size:%u\n",
1050 map->name, (__u32)value_size, def->value_size);
1054 map->btf_key_type_id = key->type;
1055 map->btf_value_type_id = value->type;
1060 int bpf_map__reuse_fd(struct bpf_map *map, int fd)
1062 struct bpf_map_info info = {};
1063 __u32 len = sizeof(info);
1067 err = bpf_obj_get_info_by_fd(fd, &info, &len);
1071 new_name = strdup(info.name);
1075 new_fd = open("/", O_RDONLY | O_CLOEXEC);
1077 goto err_free_new_name;
1079 new_fd = dup3(fd, new_fd, O_CLOEXEC);
1081 goto err_close_new_fd;
1083 err = zclose(map->fd);
1085 goto err_close_new_fd;
1089 map->name = new_name;
1090 map->def.type = info.type;
1091 map->def.key_size = info.key_size;
1092 map->def.value_size = info.value_size;
1093 map->def.max_entries = info.max_entries;
1094 map->def.map_flags = info.map_flags;
1095 map->btf_key_type_id = info.btf_key_type_id;
1096 map->btf_value_type_id = info.btf_value_type_id;
1108 bpf_object__create_maps(struct bpf_object *obj)
1110 struct bpf_create_map_attr create_attr = {};
1114 for (i = 0; i < obj->nr_maps; i++) {
1115 struct bpf_map *map = &obj->maps[i];
1116 struct bpf_map_def *def = &map->def;
1117 char *cp, errmsg[STRERR_BUFSIZE];
1118 int *pfd = &map->fd;
1121 pr_debug("skip map create (preset) %s: fd=%d\n",
1122 map->name, map->fd);
1126 create_attr.name = map->name;
1127 create_attr.map_ifindex = map->map_ifindex;
1128 create_attr.map_type = def->type;
1129 create_attr.map_flags = def->map_flags;
1130 create_attr.key_size = def->key_size;
1131 create_attr.value_size = def->value_size;
1132 create_attr.max_entries = def->max_entries;
1133 create_attr.btf_fd = 0;
1134 create_attr.btf_key_type_id = 0;
1135 create_attr.btf_value_type_id = 0;
1137 if (obj->btf && !bpf_map_find_btf_info(map, obj->btf)) {
1138 create_attr.btf_fd = btf__fd(obj->btf);
1139 create_attr.btf_key_type_id = map->btf_key_type_id;
1140 create_attr.btf_value_type_id = map->btf_value_type_id;
1143 *pfd = bpf_create_map_xattr(&create_attr);
1144 if (*pfd < 0 && create_attr.btf_key_type_id) {
1145 cp = str_error(errno, errmsg, sizeof(errmsg));
1146 pr_warning("Error in bpf_create_map_xattr(%s):%s(%d). Retrying without BTF.\n",
1147 map->name, cp, errno);
1148 create_attr.btf_fd = 0;
1149 create_attr.btf_key_type_id = 0;
1150 create_attr.btf_value_type_id = 0;
1151 map->btf_key_type_id = 0;
1152 map->btf_value_type_id = 0;
1153 *pfd = bpf_create_map_xattr(&create_attr);
1160 cp = str_error(errno, errmsg, sizeof(errmsg));
1161 pr_warning("failed to create map (name: '%s'): %s\n",
1163 for (j = 0; j < i; j++)
1164 zclose(obj->maps[j].fd);
1167 pr_debug("create map %s: fd=%d\n", map->name, *pfd);
1174 bpf_program__reloc_text(struct bpf_program *prog, struct bpf_object *obj,
1175 struct reloc_desc *relo)
1177 struct bpf_insn *insn, *new_insn;
1178 struct bpf_program *text;
1181 if (relo->type != RELO_CALL)
1182 return -LIBBPF_ERRNO__RELOC;
1184 if (prog->idx == obj->efile.text_shndx) {
1185 pr_warning("relo in .text insn %d into off %d\n",
1186 relo->insn_idx, relo->text_off);
1187 return -LIBBPF_ERRNO__RELOC;
1190 if (prog->main_prog_cnt == 0) {
1191 text = bpf_object__find_prog_by_idx(obj, obj->efile.text_shndx);
1193 pr_warning("no .text section found yet relo into text exist\n");
1194 return -LIBBPF_ERRNO__RELOC;
1196 new_cnt = prog->insns_cnt + text->insns_cnt;
1197 new_insn = reallocarray(prog->insns, new_cnt, sizeof(*insn));
1199 pr_warning("oom in prog realloc\n");
1202 memcpy(new_insn + prog->insns_cnt, text->insns,
1203 text->insns_cnt * sizeof(*insn));
1204 prog->insns = new_insn;
1205 prog->main_prog_cnt = prog->insns_cnt;
1206 prog->insns_cnt = new_cnt;
1207 pr_debug("added %zd insn from %s to prog %s\n",
1208 text->insns_cnt, text->section_name,
1209 prog->section_name);
1211 insn = &prog->insns[relo->insn_idx];
1212 insn->imm += prog->main_prog_cnt - relo->insn_idx;
1217 bpf_program__relocate(struct bpf_program *prog, struct bpf_object *obj)
1221 if (!prog || !prog->reloc_desc)
1224 for (i = 0; i < prog->nr_reloc; i++) {
1225 if (prog->reloc_desc[i].type == RELO_LD64) {
1226 struct bpf_insn *insns = prog->insns;
1227 int insn_idx, map_idx;
1229 insn_idx = prog->reloc_desc[i].insn_idx;
1230 map_idx = prog->reloc_desc[i].map_idx;
1232 if (insn_idx >= (int)prog->insns_cnt) {
1233 pr_warning("relocation out of range: '%s'\n",
1234 prog->section_name);
1235 return -LIBBPF_ERRNO__RELOC;
1237 insns[insn_idx].src_reg = BPF_PSEUDO_MAP_FD;
1238 insns[insn_idx].imm = obj->maps[map_idx].fd;
1240 err = bpf_program__reloc_text(prog, obj,
1241 &prog->reloc_desc[i]);
1247 zfree(&prog->reloc_desc);
1254 bpf_object__relocate(struct bpf_object *obj)
1256 struct bpf_program *prog;
1260 for (i = 0; i < obj->nr_programs; i++) {
1261 prog = &obj->programs[i];
1263 err = bpf_program__relocate(prog, obj);
1265 pr_warning("failed to relocate '%s'\n",
1266 prog->section_name);
1273 static int bpf_object__collect_reloc(struct bpf_object *obj)
1277 if (!obj_elf_valid(obj)) {
1278 pr_warning("Internal error: elf object is closed\n");
1279 return -LIBBPF_ERRNO__INTERNAL;
1282 for (i = 0; i < obj->efile.nr_reloc; i++) {
1283 GElf_Shdr *shdr = &obj->efile.reloc[i].shdr;
1284 Elf_Data *data = obj->efile.reloc[i].data;
1285 int idx = shdr->sh_info;
1286 struct bpf_program *prog;
1288 if (shdr->sh_type != SHT_REL) {
1289 pr_warning("internal error at %d\n", __LINE__);
1290 return -LIBBPF_ERRNO__INTERNAL;
1293 prog = bpf_object__find_prog_by_idx(obj, idx);
1295 pr_warning("relocation failed: no section(%d)\n", idx);
1296 return -LIBBPF_ERRNO__RELOC;
1299 err = bpf_program__collect_reloc(prog,
1309 load_program(enum bpf_prog_type type, enum bpf_attach_type expected_attach_type,
1310 const char *name, struct bpf_insn *insns, int insns_cnt,
1311 char *license, u32 kern_version, int *pfd, int prog_ifindex)
1313 struct bpf_load_program_attr load_attr;
1314 char *cp, errmsg[STRERR_BUFSIZE];
1318 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
1319 load_attr.prog_type = type;
1320 load_attr.expected_attach_type = expected_attach_type;
1321 load_attr.name = name;
1322 load_attr.insns = insns;
1323 load_attr.insns_cnt = insns_cnt;
1324 load_attr.license = license;
1325 load_attr.kern_version = kern_version;
1326 load_attr.prog_ifindex = prog_ifindex;
1328 if (!load_attr.insns || !load_attr.insns_cnt)
1331 log_buf = malloc(BPF_LOG_BUF_SIZE);
1333 pr_warning("Alloc log buffer for bpf loader error, continue without log\n");
1335 ret = bpf_load_program_xattr(&load_attr, log_buf, BPF_LOG_BUF_SIZE);
1343 ret = -LIBBPF_ERRNO__LOAD;
1344 cp = str_error(errno, errmsg, sizeof(errmsg));
1345 pr_warning("load bpf program failed: %s\n", cp);
1347 if (log_buf && log_buf[0] != '\0') {
1348 ret = -LIBBPF_ERRNO__VERIFY;
1349 pr_warning("-- BEGIN DUMP LOG ---\n");
1350 pr_warning("\n%s\n", log_buf);
1351 pr_warning("-- END LOG --\n");
1352 } else if (load_attr.insns_cnt >= BPF_MAXINSNS) {
1353 pr_warning("Program too large (%zu insns), at most %d insns\n",
1354 load_attr.insns_cnt, BPF_MAXINSNS);
1355 ret = -LIBBPF_ERRNO__PROG2BIG;
1357 /* Wrong program type? */
1358 if (load_attr.prog_type != BPF_PROG_TYPE_KPROBE) {
1361 load_attr.prog_type = BPF_PROG_TYPE_KPROBE;
1362 load_attr.expected_attach_type = 0;
1363 fd = bpf_load_program_xattr(&load_attr, NULL, 0);
1366 ret = -LIBBPF_ERRNO__PROGTYPE;
1372 ret = -LIBBPF_ERRNO__KVER;
1381 bpf_program__load(struct bpf_program *prog,
1382 char *license, u32 kern_version)
1386 if (prog->instances.nr < 0 || !prog->instances.fds) {
1387 if (prog->preprocessor) {
1388 pr_warning("Internal error: can't load program '%s'\n",
1389 prog->section_name);
1390 return -LIBBPF_ERRNO__INTERNAL;
1393 prog->instances.fds = malloc(sizeof(int));
1394 if (!prog->instances.fds) {
1395 pr_warning("Not enough memory for BPF fds\n");
1398 prog->instances.nr = 1;
1399 prog->instances.fds[0] = -1;
1402 if (!prog->preprocessor) {
1403 if (prog->instances.nr != 1) {
1404 pr_warning("Program '%s' is inconsistent: nr(%d) != 1\n",
1405 prog->section_name, prog->instances.nr);
1407 err = load_program(prog->type, prog->expected_attach_type,
1408 prog->name, prog->insns, prog->insns_cnt,
1409 license, kern_version, &fd,
1410 prog->prog_ifindex);
1412 prog->instances.fds[0] = fd;
1416 for (i = 0; i < prog->instances.nr; i++) {
1417 struct bpf_prog_prep_result result;
1418 bpf_program_prep_t preprocessor = prog->preprocessor;
1420 bzero(&result, sizeof(result));
1421 err = preprocessor(prog, i, prog->insns,
1422 prog->insns_cnt, &result);
1424 pr_warning("Preprocessing the %dth instance of program '%s' failed\n",
1425 i, prog->section_name);
1429 if (!result.new_insn_ptr || !result.new_insn_cnt) {
1430 pr_debug("Skip loading the %dth instance of program '%s'\n",
1431 i, prog->section_name);
1432 prog->instances.fds[i] = -1;
1438 err = load_program(prog->type, prog->expected_attach_type,
1439 prog->name, result.new_insn_ptr,
1440 result.new_insn_cnt,
1441 license, kern_version, &fd,
1442 prog->prog_ifindex);
1445 pr_warning("Loading the %dth instance of program '%s' failed\n",
1446 i, prog->section_name);
1452 prog->instances.fds[i] = fd;
1456 pr_warning("failed to load program '%s'\n",
1457 prog->section_name);
1458 zfree(&prog->insns);
1459 prog->insns_cnt = 0;
1463 static bool bpf_program__is_function_storage(struct bpf_program *prog,
1464 struct bpf_object *obj)
1466 return prog->idx == obj->efile.text_shndx && obj->has_pseudo_calls;
1470 bpf_object__load_progs(struct bpf_object *obj)
1475 for (i = 0; i < obj->nr_programs; i++) {
1476 if (bpf_program__is_function_storage(&obj->programs[i], obj))
1478 err = bpf_program__load(&obj->programs[i],
1487 static bool bpf_prog_type__needs_kver(enum bpf_prog_type type)
1490 case BPF_PROG_TYPE_SOCKET_FILTER:
1491 case BPF_PROG_TYPE_SCHED_CLS:
1492 case BPF_PROG_TYPE_SCHED_ACT:
1493 case BPF_PROG_TYPE_XDP:
1494 case BPF_PROG_TYPE_CGROUP_SKB:
1495 case BPF_PROG_TYPE_CGROUP_SOCK:
1496 case BPF_PROG_TYPE_LWT_IN:
1497 case BPF_PROG_TYPE_LWT_OUT:
1498 case BPF_PROG_TYPE_LWT_XMIT:
1499 case BPF_PROG_TYPE_LWT_SEG6LOCAL:
1500 case BPF_PROG_TYPE_SOCK_OPS:
1501 case BPF_PROG_TYPE_SK_SKB:
1502 case BPF_PROG_TYPE_CGROUP_DEVICE:
1503 case BPF_PROG_TYPE_SK_MSG:
1504 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
1505 case BPF_PROG_TYPE_LIRC_MODE2:
1506 case BPF_PROG_TYPE_SK_REUSEPORT:
1508 case BPF_PROG_TYPE_UNSPEC:
1509 case BPF_PROG_TYPE_KPROBE:
1510 case BPF_PROG_TYPE_TRACEPOINT:
1511 case BPF_PROG_TYPE_PERF_EVENT:
1512 case BPF_PROG_TYPE_RAW_TRACEPOINT:
1518 static int bpf_object__validate(struct bpf_object *obj, bool needs_kver)
1520 if (needs_kver && obj->kern_version == 0) {
1521 pr_warning("%s doesn't provide kernel version\n",
1523 return -LIBBPF_ERRNO__KVERSION;
1528 static struct bpf_object *
1529 __bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz,
1532 struct bpf_object *obj;
1535 if (elf_version(EV_CURRENT) == EV_NONE) {
1536 pr_warning("failed to init libelf for %s\n", path);
1537 return ERR_PTR(-LIBBPF_ERRNO__LIBELF);
1540 obj = bpf_object__new(path, obj_buf, obj_buf_sz);
1544 CHECK_ERR(bpf_object__elf_init(obj), err, out);
1545 CHECK_ERR(bpf_object__check_endianness(obj), err, out);
1546 CHECK_ERR(bpf_object__elf_collect(obj), err, out);
1547 CHECK_ERR(bpf_object__collect_reloc(obj), err, out);
1548 CHECK_ERR(bpf_object__validate(obj, needs_kver), err, out);
1550 bpf_object__elf_finish(obj);
1553 bpf_object__close(obj);
1554 return ERR_PTR(err);
1557 struct bpf_object *bpf_object__open_xattr(struct bpf_object_open_attr *attr)
1559 /* param validation */
1563 pr_debug("loading %s\n", attr->file);
1565 return __bpf_object__open(attr->file, NULL, 0,
1566 bpf_prog_type__needs_kver(attr->prog_type));
1569 struct bpf_object *bpf_object__open(const char *path)
1571 struct bpf_object_open_attr attr = {
1573 .prog_type = BPF_PROG_TYPE_UNSPEC,
1576 return bpf_object__open_xattr(&attr);
1579 struct bpf_object *bpf_object__open_buffer(void *obj_buf,
1585 /* param validation */
1586 if (!obj_buf || obj_buf_sz <= 0)
1590 snprintf(tmp_name, sizeof(tmp_name), "%lx-%lx",
1591 (unsigned long)obj_buf,
1592 (unsigned long)obj_buf_sz);
1593 tmp_name[sizeof(tmp_name) - 1] = '\0';
1596 pr_debug("loading object '%s' from buffer\n",
1599 return __bpf_object__open(name, obj_buf, obj_buf_sz, true);
1602 int bpf_object__unload(struct bpf_object *obj)
1609 for (i = 0; i < obj->nr_maps; i++)
1610 zclose(obj->maps[i].fd);
1612 for (i = 0; i < obj->nr_programs; i++)
1613 bpf_program__unload(&obj->programs[i]);
1618 int bpf_object__load(struct bpf_object *obj)
1626 pr_warning("object should not be loaded twice\n");
1632 CHECK_ERR(bpf_object__create_maps(obj), err, out);
1633 CHECK_ERR(bpf_object__relocate(obj), err, out);
1634 CHECK_ERR(bpf_object__load_progs(obj), err, out);
1638 bpf_object__unload(obj);
1639 pr_warning("failed to load object '%s'\n", obj->path);
1643 static int check_path(const char *path)
1645 char *cp, errmsg[STRERR_BUFSIZE];
1646 struct statfs st_fs;
1653 dname = strdup(path);
1657 dir = dirname(dname);
1658 if (statfs(dir, &st_fs)) {
1659 cp = str_error(errno, errmsg, sizeof(errmsg));
1660 pr_warning("failed to statfs %s: %s\n", dir, cp);
1665 if (!err && st_fs.f_type != BPF_FS_MAGIC) {
1666 pr_warning("specified path %s is not on BPF FS\n", path);
1673 int bpf_program__pin_instance(struct bpf_program *prog, const char *path,
1676 char *cp, errmsg[STRERR_BUFSIZE];
1679 err = check_path(path);
1684 pr_warning("invalid program pointer\n");
1688 if (instance < 0 || instance >= prog->instances.nr) {
1689 pr_warning("invalid prog instance %d of prog %s (max %d)\n",
1690 instance, prog->section_name, prog->instances.nr);
1694 if (bpf_obj_pin(prog->instances.fds[instance], path)) {
1695 cp = str_error(errno, errmsg, sizeof(errmsg));
1696 pr_warning("failed to pin program: %s\n", cp);
1699 pr_debug("pinned program '%s'\n", path);
1704 static int make_dir(const char *path)
1706 char *cp, errmsg[STRERR_BUFSIZE];
1709 if (mkdir(path, 0700) && errno != EEXIST)
1713 cp = str_error(-err, errmsg, sizeof(errmsg));
1714 pr_warning("failed to mkdir %s: %s\n", path, cp);
1719 int bpf_program__pin(struct bpf_program *prog, const char *path)
1723 err = check_path(path);
1728 pr_warning("invalid program pointer\n");
1732 if (prog->instances.nr <= 0) {
1733 pr_warning("no instances of prog %s to pin\n",
1734 prog->section_name);
1738 err = make_dir(path);
1742 for (i = 0; i < prog->instances.nr; i++) {
1746 len = snprintf(buf, PATH_MAX, "%s/%d", path, i);
1749 else if (len >= PATH_MAX)
1750 return -ENAMETOOLONG;
1752 err = bpf_program__pin_instance(prog, buf, i);
1760 int bpf_map__pin(struct bpf_map *map, const char *path)
1762 char *cp, errmsg[STRERR_BUFSIZE];
1765 err = check_path(path);
1770 pr_warning("invalid map pointer\n");
1774 if (bpf_obj_pin(map->fd, path)) {
1775 cp = str_error(errno, errmsg, sizeof(errmsg));
1776 pr_warning("failed to pin map: %s\n", cp);
1780 pr_debug("pinned map '%s'\n", path);
1784 int bpf_object__pin(struct bpf_object *obj, const char *path)
1786 struct bpf_program *prog;
1787 struct bpf_map *map;
1794 pr_warning("object not yet loaded; load it first\n");
1798 err = make_dir(path);
1802 bpf_map__for_each(map, obj) {
1806 len = snprintf(buf, PATH_MAX, "%s/%s", path,
1807 bpf_map__name(map));
1810 else if (len >= PATH_MAX)
1811 return -ENAMETOOLONG;
1813 err = bpf_map__pin(map, buf);
1818 bpf_object__for_each_program(prog, obj) {
1822 len = snprintf(buf, PATH_MAX, "%s/%s", path,
1823 prog->section_name);
1826 else if (len >= PATH_MAX)
1827 return -ENAMETOOLONG;
1829 err = bpf_program__pin(prog, buf);
1837 void bpf_object__close(struct bpf_object *obj)
1844 if (obj->clear_priv)
1845 obj->clear_priv(obj, obj->priv);
1847 bpf_object__elf_finish(obj);
1848 bpf_object__unload(obj);
1849 btf__free(obj->btf);
1851 for (i = 0; i < obj->nr_maps; i++) {
1852 zfree(&obj->maps[i].name);
1853 if (obj->maps[i].clear_priv)
1854 obj->maps[i].clear_priv(&obj->maps[i],
1856 obj->maps[i].priv = NULL;
1857 obj->maps[i].clear_priv = NULL;
1862 if (obj->programs && obj->nr_programs) {
1863 for (i = 0; i < obj->nr_programs; i++)
1864 bpf_program__exit(&obj->programs[i]);
1866 zfree(&obj->programs);
1868 list_del(&obj->list);
1873 bpf_object__next(struct bpf_object *prev)
1875 struct bpf_object *next;
1878 next = list_first_entry(&bpf_objects_list,
1882 next = list_next_entry(prev, list);
1884 /* Empty list is noticed here so don't need checking on entry. */
1885 if (&next->list == &bpf_objects_list)
1891 const char *bpf_object__name(struct bpf_object *obj)
1893 return obj ? obj->path : ERR_PTR(-EINVAL);
1896 unsigned int bpf_object__kversion(struct bpf_object *obj)
1898 return obj ? obj->kern_version : 0;
1901 int bpf_object__btf_fd(const struct bpf_object *obj)
1903 return obj->btf ? btf__fd(obj->btf) : -1;
1906 int bpf_object__set_priv(struct bpf_object *obj, void *priv,
1907 bpf_object_clear_priv_t clear_priv)
1909 if (obj->priv && obj->clear_priv)
1910 obj->clear_priv(obj, obj->priv);
1913 obj->clear_priv = clear_priv;
1917 void *bpf_object__priv(struct bpf_object *obj)
1919 return obj ? obj->priv : ERR_PTR(-EINVAL);
1922 static struct bpf_program *
1923 __bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
1931 return &obj->programs[0];
1933 if (prev->obj != obj) {
1934 pr_warning("error: program handler doesn't match object\n");
1938 idx = (prev - obj->programs) + 1;
1939 if (idx >= obj->nr_programs)
1941 return &obj->programs[idx];
1944 struct bpf_program *
1945 bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
1947 struct bpf_program *prog = prev;
1950 prog = __bpf_program__next(prog, obj);
1951 } while (prog && bpf_program__is_function_storage(prog, obj));
1956 int bpf_program__set_priv(struct bpf_program *prog, void *priv,
1957 bpf_program_clear_priv_t clear_priv)
1959 if (prog->priv && prog->clear_priv)
1960 prog->clear_priv(prog, prog->priv);
1963 prog->clear_priv = clear_priv;
1967 void *bpf_program__priv(struct bpf_program *prog)
1969 return prog ? prog->priv : ERR_PTR(-EINVAL);
1972 void bpf_program__set_ifindex(struct bpf_program *prog, __u32 ifindex)
1974 prog->prog_ifindex = ifindex;
1977 const char *bpf_program__title(struct bpf_program *prog, bool needs_copy)
1981 title = prog->section_name;
1983 title = strdup(title);
1985 pr_warning("failed to strdup program title\n");
1986 return ERR_PTR(-ENOMEM);
1993 int bpf_program__fd(struct bpf_program *prog)
1995 return bpf_program__nth_fd(prog, 0);
1998 int bpf_program__set_prep(struct bpf_program *prog, int nr_instances,
1999 bpf_program_prep_t prep)
2003 if (nr_instances <= 0 || !prep)
2006 if (prog->instances.nr > 0 || prog->instances.fds) {
2007 pr_warning("Can't set pre-processor after loading\n");
2011 instances_fds = malloc(sizeof(int) * nr_instances);
2012 if (!instances_fds) {
2013 pr_warning("alloc memory failed for fds\n");
2017 /* fill all fd with -1 */
2018 memset(instances_fds, -1, sizeof(int) * nr_instances);
2020 prog->instances.nr = nr_instances;
2021 prog->instances.fds = instances_fds;
2022 prog->preprocessor = prep;
2026 int bpf_program__nth_fd(struct bpf_program *prog, int n)
2033 if (n >= prog->instances.nr || n < 0) {
2034 pr_warning("Can't get the %dth fd from program %s: only %d instances\n",
2035 n, prog->section_name, prog->instances.nr);
2039 fd = prog->instances.fds[n];
2041 pr_warning("%dth instance of program '%s' is invalid\n",
2042 n, prog->section_name);
2049 void bpf_program__set_type(struct bpf_program *prog, enum bpf_prog_type type)
2054 static bool bpf_program__is_type(struct bpf_program *prog,
2055 enum bpf_prog_type type)
2057 return prog ? (prog->type == type) : false;
2060 #define BPF_PROG_TYPE_FNS(NAME, TYPE) \
2061 int bpf_program__set_##NAME(struct bpf_program *prog) \
2065 bpf_program__set_type(prog, TYPE); \
2069 bool bpf_program__is_##NAME(struct bpf_program *prog) \
2071 return bpf_program__is_type(prog, TYPE); \
2074 BPF_PROG_TYPE_FNS(socket_filter, BPF_PROG_TYPE_SOCKET_FILTER);
2075 BPF_PROG_TYPE_FNS(kprobe, BPF_PROG_TYPE_KPROBE);
2076 BPF_PROG_TYPE_FNS(sched_cls, BPF_PROG_TYPE_SCHED_CLS);
2077 BPF_PROG_TYPE_FNS(sched_act, BPF_PROG_TYPE_SCHED_ACT);
2078 BPF_PROG_TYPE_FNS(tracepoint, BPF_PROG_TYPE_TRACEPOINT);
2079 BPF_PROG_TYPE_FNS(raw_tracepoint, BPF_PROG_TYPE_RAW_TRACEPOINT);
2080 BPF_PROG_TYPE_FNS(xdp, BPF_PROG_TYPE_XDP);
2081 BPF_PROG_TYPE_FNS(perf_event, BPF_PROG_TYPE_PERF_EVENT);
2083 void bpf_program__set_expected_attach_type(struct bpf_program *prog,
2084 enum bpf_attach_type type)
2086 prog->expected_attach_type = type;
2089 #define BPF_PROG_SEC_FULL(string, ptype, atype) \
2090 { string, sizeof(string) - 1, ptype, atype }
2092 #define BPF_PROG_SEC(string, ptype) BPF_PROG_SEC_FULL(string, ptype, 0)
2094 #define BPF_S_PROG_SEC(string, ptype) \
2095 BPF_PROG_SEC_FULL(string, BPF_PROG_TYPE_CGROUP_SOCK, ptype)
2097 #define BPF_SA_PROG_SEC(string, ptype) \
2098 BPF_PROG_SEC_FULL(string, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, ptype)
2100 static const struct {
2103 enum bpf_prog_type prog_type;
2104 enum bpf_attach_type expected_attach_type;
2105 } section_names[] = {
2106 BPF_PROG_SEC("socket", BPF_PROG_TYPE_SOCKET_FILTER),
2107 BPF_PROG_SEC("kprobe/", BPF_PROG_TYPE_KPROBE),
2108 BPF_PROG_SEC("kretprobe/", BPF_PROG_TYPE_KPROBE),
2109 BPF_PROG_SEC("classifier", BPF_PROG_TYPE_SCHED_CLS),
2110 BPF_PROG_SEC("action", BPF_PROG_TYPE_SCHED_ACT),
2111 BPF_PROG_SEC("tracepoint/", BPF_PROG_TYPE_TRACEPOINT),
2112 BPF_PROG_SEC("raw_tracepoint/", BPF_PROG_TYPE_RAW_TRACEPOINT),
2113 BPF_PROG_SEC("xdp", BPF_PROG_TYPE_XDP),
2114 BPF_PROG_SEC("perf_event", BPF_PROG_TYPE_PERF_EVENT),
2115 BPF_PROG_SEC("cgroup/skb", BPF_PROG_TYPE_CGROUP_SKB),
2116 BPF_PROG_SEC("cgroup/sock", BPF_PROG_TYPE_CGROUP_SOCK),
2117 BPF_PROG_SEC("cgroup/dev", BPF_PROG_TYPE_CGROUP_DEVICE),
2118 BPF_PROG_SEC("lwt_in", BPF_PROG_TYPE_LWT_IN),
2119 BPF_PROG_SEC("lwt_out", BPF_PROG_TYPE_LWT_OUT),
2120 BPF_PROG_SEC("lwt_xmit", BPF_PROG_TYPE_LWT_XMIT),
2121 BPF_PROG_SEC("lwt_seg6local", BPF_PROG_TYPE_LWT_SEG6LOCAL),
2122 BPF_PROG_SEC("sockops", BPF_PROG_TYPE_SOCK_OPS),
2123 BPF_PROG_SEC("sk_skb", BPF_PROG_TYPE_SK_SKB),
2124 BPF_PROG_SEC("sk_msg", BPF_PROG_TYPE_SK_MSG),
2125 BPF_PROG_SEC("lirc_mode2", BPF_PROG_TYPE_LIRC_MODE2),
2126 BPF_SA_PROG_SEC("cgroup/bind4", BPF_CGROUP_INET4_BIND),
2127 BPF_SA_PROG_SEC("cgroup/bind6", BPF_CGROUP_INET6_BIND),
2128 BPF_SA_PROG_SEC("cgroup/connect4", BPF_CGROUP_INET4_CONNECT),
2129 BPF_SA_PROG_SEC("cgroup/connect6", BPF_CGROUP_INET6_CONNECT),
2130 BPF_SA_PROG_SEC("cgroup/sendmsg4", BPF_CGROUP_UDP4_SENDMSG),
2131 BPF_SA_PROG_SEC("cgroup/sendmsg6", BPF_CGROUP_UDP6_SENDMSG),
2132 BPF_S_PROG_SEC("cgroup/post_bind4", BPF_CGROUP_INET4_POST_BIND),
2133 BPF_S_PROG_SEC("cgroup/post_bind6", BPF_CGROUP_INET6_POST_BIND),
2137 #undef BPF_PROG_SEC_FULL
2138 #undef BPF_S_PROG_SEC
2139 #undef BPF_SA_PROG_SEC
2141 int libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
2142 enum bpf_attach_type *expected_attach_type)
2149 for (i = 0; i < ARRAY_SIZE(section_names); i++) {
2150 if (strncmp(name, section_names[i].sec, section_names[i].len))
2152 *prog_type = section_names[i].prog_type;
2153 *expected_attach_type = section_names[i].expected_attach_type;
2160 bpf_program__identify_section(struct bpf_program *prog,
2161 enum bpf_prog_type *prog_type,
2162 enum bpf_attach_type *expected_attach_type)
2164 return libbpf_prog_type_by_name(prog->section_name, prog_type,
2165 expected_attach_type);
2168 int bpf_map__fd(struct bpf_map *map)
2170 return map ? map->fd : -EINVAL;
2173 const struct bpf_map_def *bpf_map__def(struct bpf_map *map)
2175 return map ? &map->def : ERR_PTR(-EINVAL);
2178 const char *bpf_map__name(struct bpf_map *map)
2180 return map ? map->name : NULL;
2183 __u32 bpf_map__btf_key_type_id(const struct bpf_map *map)
2185 return map ? map->btf_key_type_id : 0;
2188 __u32 bpf_map__btf_value_type_id(const struct bpf_map *map)
2190 return map ? map->btf_value_type_id : 0;
2193 int bpf_map__set_priv(struct bpf_map *map, void *priv,
2194 bpf_map_clear_priv_t clear_priv)
2200 if (map->clear_priv)
2201 map->clear_priv(map, map->priv);
2205 map->clear_priv = clear_priv;
2209 void *bpf_map__priv(struct bpf_map *map)
2211 return map ? map->priv : ERR_PTR(-EINVAL);
2214 bool bpf_map__is_offload_neutral(struct bpf_map *map)
2216 return map->def.type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
2219 void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex)
2221 map->map_ifindex = ifindex;
2225 bpf_map__next(struct bpf_map *prev, struct bpf_object *obj)
2228 struct bpf_map *s, *e;
2230 if (!obj || !obj->maps)
2234 e = obj->maps + obj->nr_maps;
2239 if ((prev < s) || (prev >= e)) {
2240 pr_warning("error in %s: map handler doesn't belong to object\n",
2245 idx = (prev - obj->maps) + 1;
2246 if (idx >= obj->nr_maps)
2248 return &obj->maps[idx];
2252 bpf_object__find_map_by_name(struct bpf_object *obj, const char *name)
2254 struct bpf_map *pos;
2256 bpf_map__for_each(pos, obj) {
2257 if (pos->name && !strcmp(pos->name, name))
2264 bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset)
2268 for (i = 0; i < obj->nr_maps; i++) {
2269 if (obj->maps[i].offset == offset)
2270 return &obj->maps[i];
2272 return ERR_PTR(-ENOENT);
2275 long libbpf_get_error(const void *ptr)
2278 return PTR_ERR(ptr);
2282 int bpf_prog_load(const char *file, enum bpf_prog_type type,
2283 struct bpf_object **pobj, int *prog_fd)
2285 struct bpf_prog_load_attr attr;
2287 memset(&attr, 0, sizeof(struct bpf_prog_load_attr));
2289 attr.prog_type = type;
2290 attr.expected_attach_type = 0;
2292 return bpf_prog_load_xattr(&attr, pobj, prog_fd);
2295 int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
2296 struct bpf_object **pobj, int *prog_fd)
2298 struct bpf_object_open_attr open_attr = {};
2299 struct bpf_program *prog, *first_prog = NULL;
2300 enum bpf_attach_type expected_attach_type;
2301 enum bpf_prog_type prog_type;
2302 struct bpf_object *obj;
2303 struct bpf_map *map;
2311 open_attr.file = attr->file;
2312 open_attr.prog_type = attr->prog_type;
2314 obj = bpf_object__open_xattr(&open_attr);
2315 if (IS_ERR_OR_NULL(obj))
2318 bpf_object__for_each_program(prog, obj) {
2320 * If type is not specified, try to guess it based on
2323 prog_type = attr->prog_type;
2324 prog->prog_ifindex = attr->ifindex;
2325 expected_attach_type = attr->expected_attach_type;
2326 if (prog_type == BPF_PROG_TYPE_UNSPEC) {
2327 err = bpf_program__identify_section(prog, &prog_type,
2328 &expected_attach_type);
2330 pr_warning("failed to guess program type based on section name %s\n",
2331 prog->section_name);
2332 bpf_object__close(obj);
2337 bpf_program__set_type(prog, prog_type);
2338 bpf_program__set_expected_attach_type(prog,
2339 expected_attach_type);
2341 if (!bpf_program__is_function_storage(prog, obj) && !first_prog)
2345 bpf_map__for_each(map, obj) {
2346 if (!bpf_map__is_offload_neutral(map))
2347 map->map_ifindex = attr->ifindex;
2351 pr_warning("object file doesn't contain bpf program\n");
2352 bpf_object__close(obj);
2356 err = bpf_object__load(obj);
2358 bpf_object__close(obj);
2363 *prog_fd = bpf_program__fd(first_prog);
2367 enum bpf_perf_event_ret
2368 bpf_perf_event_read_simple(void *mem, unsigned long size,
2369 unsigned long page_size, void **buf, size_t *buf_len,
2370 bpf_perf_event_print_t fn, void *priv)
2372 volatile struct perf_event_mmap_page *header = mem;
2373 __u64 data_tail = header->data_tail;
2374 __u64 data_head = header->data_head;
2375 int ret = LIBBPF_PERF_EVENT_ERROR;
2376 void *base, *begin, *end;
2378 asm volatile("" ::: "memory"); /* in real code it should be smp_rmb() */
2379 if (data_head == data_tail)
2380 return LIBBPF_PERF_EVENT_CONT;
2382 base = ((char *)header) + page_size;
2384 begin = base + data_tail % size;
2385 end = base + data_head % size;
2387 while (begin != end) {
2388 struct perf_event_header *ehdr;
2391 if (begin + ehdr->size > base + size) {
2392 long len = base + size - begin;
2394 if (*buf_len < ehdr->size) {
2396 *buf = malloc(ehdr->size);
2398 ret = LIBBPF_PERF_EVENT_ERROR;
2401 *buf_len = ehdr->size;
2404 memcpy(*buf, begin, len);
2405 memcpy(*buf + len, base, ehdr->size - len);
2406 ehdr = (void *)*buf;
2407 begin = base + ehdr->size - len;
2408 } else if (begin + ehdr->size == base + size) {
2411 begin += ehdr->size;
2414 ret = fn(ehdr, priv);
2415 if (ret != LIBBPF_PERF_EVENT_CONT)
2418 data_tail += ehdr->size;
2421 __sync_synchronize(); /* smp_mb() */
2422 header->data_tail = data_tail;