Commit | Line | Data |
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6061a3d6 EL |
1 | // SPDX-License-Identifier: LGPL-2.1 |
2 | ||
1b76c13e WN |
3 | /* |
4 | * Common eBPF ELF object loading operations. | |
5 | * | |
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. | |
f367540c | 9 | * Copyright (C) 2017 Nicira, Inc. |
203d1cac WN |
10 | * |
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!) | |
15 | * | |
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. | |
20 | * | |
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> | |
1b76c13e WN |
23 | */ |
24 | ||
25 | #include <stdlib.h> | |
b3f59d66 WN |
26 | #include <stdio.h> |
27 | #include <stdarg.h> | |
f367540c | 28 | #include <libgen.h> |
34090915 | 29 | #include <inttypes.h> |
b3f59d66 | 30 | #include <string.h> |
1b76c13e | 31 | #include <unistd.h> |
1a5e3fb1 WN |
32 | #include <fcntl.h> |
33 | #include <errno.h> | |
d0cabbb0 | 34 | #include <perf-sys.h> |
1b76c13e | 35 | #include <asm/unistd.h> |
e28ff1a8 | 36 | #include <linux/err.h> |
cb1e5e96 | 37 | #include <linux/kernel.h> |
1b76c13e | 38 | #include <linux/bpf.h> |
9a208eff | 39 | #include <linux/list.h> |
f367540c JS |
40 | #include <linux/limits.h> |
41 | #include <sys/stat.h> | |
42 | #include <sys/types.h> | |
43 | #include <sys/vfs.h> | |
1a5e3fb1 WN |
44 | #include <libelf.h> |
45 | #include <gelf.h> | |
1b76c13e WN |
46 | |
47 | #include "libbpf.h" | |
52d3352e | 48 | #include "bpf.h" |
8a138aed | 49 | #include "btf.h" |
b3f59d66 | 50 | |
9b16137a WN |
51 | #ifndef EM_BPF |
52 | #define EM_BPF 247 | |
53 | #endif | |
54 | ||
f367540c JS |
55 | #ifndef BPF_FS_MAGIC |
56 | #define BPF_FS_MAGIC 0xcafe4a11 | |
57 | #endif | |
58 | ||
b3f59d66 WN |
59 | #define __printf(a, b) __attribute__((format(printf, a, b))) |
60 | ||
61 | __printf(1, 2) | |
62 | static int __base_pr(const char *format, ...) | |
63 | { | |
64 | va_list args; | |
65 | int err; | |
66 | ||
67 | va_start(args, format); | |
68 | err = vfprintf(stderr, format, args); | |
69 | va_end(args); | |
70 | return err; | |
71 | } | |
72 | ||
73 | static __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr; | |
74 | static __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr; | |
75 | static __printf(1, 2) libbpf_print_fn_t __pr_debug; | |
76 | ||
77 | #define __pr(func, fmt, ...) \ | |
78 | do { \ | |
79 | if ((func)) \ | |
80 | (func)("libbpf: " fmt, ##__VA_ARGS__); \ | |
81 | } while (0) | |
82 | ||
83 | #define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__) | |
84 | #define pr_info(fmt, ...) __pr(__pr_info, fmt, ##__VA_ARGS__) | |
85 | #define pr_debug(fmt, ...) __pr(__pr_debug, fmt, ##__VA_ARGS__) | |
86 | ||
87 | void libbpf_set_print(libbpf_print_fn_t warn, | |
88 | libbpf_print_fn_t info, | |
89 | libbpf_print_fn_t debug) | |
90 | { | |
91 | __pr_warning = warn; | |
92 | __pr_info = info; | |
93 | __pr_debug = debug; | |
94 | } | |
1a5e3fb1 | 95 | |
6371ca3b WN |
96 | #define STRERR_BUFSIZE 128 |
97 | ||
98 | #define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START) | |
99 | #define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c) | |
100 | #define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START) | |
101 | ||
102 | static const char *libbpf_strerror_table[NR_ERRNO] = { | |
103 | [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf", | |
104 | [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid", | |
105 | [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost", | |
de8a63bd | 106 | [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch", |
6371ca3b WN |
107 | [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf", |
108 | [ERRCODE_OFFSET(RELOC)] = "Relocation failed", | |
109 | [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading", | |
110 | [ERRCODE_OFFSET(PROG2BIG)] = "Program too big", | |
111 | [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version", | |
705fa219 | 112 | [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type", |
949abbe8 EL |
113 | [ERRCODE_OFFSET(WRNGPID)] = "Wrong pid in netlink message", |
114 | [ERRCODE_OFFSET(INVSEQ)] = "Invalid netlink sequence", | |
6371ca3b WN |
115 | }; |
116 | ||
117 | int libbpf_strerror(int err, char *buf, size_t size) | |
118 | { | |
119 | if (!buf || !size) | |
120 | return -1; | |
121 | ||
122 | err = err > 0 ? err : -err; | |
123 | ||
124 | if (err < __LIBBPF_ERRNO__START) { | |
125 | int ret; | |
126 | ||
127 | ret = strerror_r(err, buf, size); | |
128 | buf[size - 1] = '\0'; | |
129 | return ret; | |
130 | } | |
131 | ||
132 | if (err < __LIBBPF_ERRNO__END) { | |
133 | const char *msg; | |
134 | ||
135 | msg = libbpf_strerror_table[ERRNO_OFFSET(err)]; | |
136 | snprintf(buf, size, "%s", msg); | |
137 | buf[size - 1] = '\0'; | |
138 | return 0; | |
139 | } | |
140 | ||
141 | snprintf(buf, size, "Unknown libbpf error %d", err); | |
142 | buf[size - 1] = '\0'; | |
143 | return -1; | |
144 | } | |
145 | ||
146 | #define CHECK_ERR(action, err, out) do { \ | |
147 | err = action; \ | |
148 | if (err) \ | |
149 | goto out; \ | |
150 | } while(0) | |
151 | ||
152 | ||
1a5e3fb1 WN |
153 | /* Copied from tools/perf/util/util.h */ |
154 | #ifndef zfree | |
155 | # define zfree(ptr) ({ free(*ptr); *ptr = NULL; }) | |
156 | #endif | |
157 | ||
158 | #ifndef zclose | |
159 | # define zclose(fd) ({ \ | |
160 | int ___err = 0; \ | |
161 | if ((fd) >= 0) \ | |
162 | ___err = close((fd)); \ | |
163 | fd = -1; \ | |
164 | ___err; }) | |
165 | #endif | |
166 | ||
167 | #ifdef HAVE_LIBELF_MMAP_SUPPORT | |
168 | # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ_MMAP | |
169 | #else | |
170 | # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ | |
171 | #endif | |
172 | ||
a5b8bd47 WN |
173 | /* |
174 | * bpf_prog should be a better name but it has been used in | |
175 | * linux/filter.h. | |
176 | */ | |
177 | struct bpf_program { | |
178 | /* Index in elf obj file, for relocation use. */ | |
179 | int idx; | |
88cda1c9 | 180 | char *name; |
f0307a7e | 181 | int prog_ifindex; |
a5b8bd47 WN |
182 | char *section_name; |
183 | struct bpf_insn *insns; | |
48cca7e4 | 184 | size_t insns_cnt, main_prog_cnt; |
5f44e4c8 | 185 | enum bpf_prog_type type; |
34090915 | 186 | |
48cca7e4 AS |
187 | struct reloc_desc { |
188 | enum { | |
189 | RELO_LD64, | |
190 | RELO_CALL, | |
191 | } type; | |
34090915 | 192 | int insn_idx; |
48cca7e4 AS |
193 | union { |
194 | int map_idx; | |
195 | int text_off; | |
196 | }; | |
34090915 WN |
197 | } *reloc_desc; |
198 | int nr_reloc; | |
55cffde2 | 199 | |
b580563e WN |
200 | struct { |
201 | int nr; | |
202 | int *fds; | |
203 | } instances; | |
204 | bpf_program_prep_t preprocessor; | |
aa9b1ac3 WN |
205 | |
206 | struct bpf_object *obj; | |
207 | void *priv; | |
208 | bpf_program_clear_priv_t clear_priv; | |
d7be143b AI |
209 | |
210 | enum bpf_attach_type expected_attach_type; | |
a5b8bd47 WN |
211 | }; |
212 | ||
9d759a9b WN |
213 | struct bpf_map { |
214 | int fd; | |
561bbcca | 215 | char *name; |
4708bbda | 216 | size_t offset; |
f0307a7e | 217 | int map_ifindex; |
9d759a9b | 218 | struct bpf_map_def def; |
61746dbe MKL |
219 | uint32_t btf_key_type_id; |
220 | uint32_t btf_value_type_id; | |
9d759a9b WN |
221 | void *priv; |
222 | bpf_map_clear_priv_t clear_priv; | |
223 | }; | |
224 | ||
9a208eff WN |
225 | static LIST_HEAD(bpf_objects_list); |
226 | ||
1a5e3fb1 | 227 | struct bpf_object { |
cb1e5e96 WN |
228 | char license[64]; |
229 | u32 kern_version; | |
0b3d1efa | 230 | |
a5b8bd47 WN |
231 | struct bpf_program *programs; |
232 | size_t nr_programs; | |
9d759a9b WN |
233 | struct bpf_map *maps; |
234 | size_t nr_maps; | |
235 | ||
52d3352e | 236 | bool loaded; |
a5b8bd47 | 237 | |
1a5e3fb1 WN |
238 | /* |
239 | * Information when doing elf related work. Only valid if fd | |
240 | * is valid. | |
241 | */ | |
242 | struct { | |
243 | int fd; | |
6c956392 WN |
244 | void *obj_buf; |
245 | size_t obj_buf_sz; | |
1a5e3fb1 WN |
246 | Elf *elf; |
247 | GElf_Ehdr ehdr; | |
bec7d68c | 248 | Elf_Data *symbols; |
77ba9a5b | 249 | size_t strtabidx; |
b62f06e8 WN |
250 | struct { |
251 | GElf_Shdr shdr; | |
252 | Elf_Data *data; | |
253 | } *reloc; | |
254 | int nr_reloc; | |
666810e8 | 255 | int maps_shndx; |
48cca7e4 | 256 | int text_shndx; |
1a5e3fb1 | 257 | } efile; |
9a208eff WN |
258 | /* |
259 | * All loaded bpf_object is linked in a list, which is | |
260 | * hidden to caller. bpf_objects__<func> handlers deal with | |
261 | * all objects. | |
262 | */ | |
263 | struct list_head list; | |
10931d24 | 264 | |
8a138aed MKL |
265 | struct btf *btf; |
266 | ||
10931d24 WN |
267 | void *priv; |
268 | bpf_object_clear_priv_t clear_priv; | |
269 | ||
1a5e3fb1 WN |
270 | char path[]; |
271 | }; | |
272 | #define obj_elf_valid(o) ((o)->efile.elf) | |
273 | ||
55cffde2 WN |
274 | static void bpf_program__unload(struct bpf_program *prog) |
275 | { | |
b580563e WN |
276 | int i; |
277 | ||
55cffde2 WN |
278 | if (!prog) |
279 | return; | |
280 | ||
b580563e WN |
281 | /* |
282 | * If the object is opened but the program was never loaded, | |
283 | * it is possible that prog->instances.nr == -1. | |
284 | */ | |
285 | if (prog->instances.nr > 0) { | |
286 | for (i = 0; i < prog->instances.nr; i++) | |
287 | zclose(prog->instances.fds[i]); | |
288 | } else if (prog->instances.nr != -1) { | |
289 | pr_warning("Internal error: instances.nr is %d\n", | |
290 | prog->instances.nr); | |
291 | } | |
292 | ||
293 | prog->instances.nr = -1; | |
294 | zfree(&prog->instances.fds); | |
55cffde2 WN |
295 | } |
296 | ||
a5b8bd47 WN |
297 | static void bpf_program__exit(struct bpf_program *prog) |
298 | { | |
299 | if (!prog) | |
300 | return; | |
301 | ||
aa9b1ac3 WN |
302 | if (prog->clear_priv) |
303 | prog->clear_priv(prog, prog->priv); | |
304 | ||
305 | prog->priv = NULL; | |
306 | prog->clear_priv = NULL; | |
307 | ||
55cffde2 | 308 | bpf_program__unload(prog); |
88cda1c9 | 309 | zfree(&prog->name); |
a5b8bd47 WN |
310 | zfree(&prog->section_name); |
311 | zfree(&prog->insns); | |
34090915 WN |
312 | zfree(&prog->reloc_desc); |
313 | ||
314 | prog->nr_reloc = 0; | |
a5b8bd47 WN |
315 | prog->insns_cnt = 0; |
316 | prog->idx = -1; | |
317 | } | |
318 | ||
319 | static int | |
88cda1c9 MKL |
320 | bpf_program__init(void *data, size_t size, char *section_name, int idx, |
321 | struct bpf_program *prog) | |
a5b8bd47 WN |
322 | { |
323 | if (size < sizeof(struct bpf_insn)) { | |
88cda1c9 | 324 | pr_warning("corrupted section '%s'\n", section_name); |
a5b8bd47 WN |
325 | return -EINVAL; |
326 | } | |
327 | ||
328 | bzero(prog, sizeof(*prog)); | |
329 | ||
88cda1c9 | 330 | prog->section_name = strdup(section_name); |
a5b8bd47 | 331 | if (!prog->section_name) { |
077c066a JDB |
332 | pr_warning("failed to alloc name for prog under section(%d) %s\n", |
333 | idx, section_name); | |
a5b8bd47 WN |
334 | goto errout; |
335 | } | |
336 | ||
337 | prog->insns = malloc(size); | |
338 | if (!prog->insns) { | |
88cda1c9 MKL |
339 | pr_warning("failed to alloc insns for prog under section %s\n", |
340 | section_name); | |
a5b8bd47 WN |
341 | goto errout; |
342 | } | |
343 | prog->insns_cnt = size / sizeof(struct bpf_insn); | |
344 | memcpy(prog->insns, data, | |
345 | prog->insns_cnt * sizeof(struct bpf_insn)); | |
346 | prog->idx = idx; | |
b580563e WN |
347 | prog->instances.fds = NULL; |
348 | prog->instances.nr = -1; | |
5f44e4c8 | 349 | prog->type = BPF_PROG_TYPE_KPROBE; |
a5b8bd47 WN |
350 | |
351 | return 0; | |
352 | errout: | |
353 | bpf_program__exit(prog); | |
354 | return -ENOMEM; | |
355 | } | |
356 | ||
357 | static int | |
358 | bpf_object__add_program(struct bpf_object *obj, void *data, size_t size, | |
88cda1c9 | 359 | char *section_name, int idx) |
a5b8bd47 WN |
360 | { |
361 | struct bpf_program prog, *progs; | |
362 | int nr_progs, err; | |
363 | ||
88cda1c9 | 364 | err = bpf_program__init(data, size, section_name, idx, &prog); |
a5b8bd47 WN |
365 | if (err) |
366 | return err; | |
367 | ||
368 | progs = obj->programs; | |
369 | nr_progs = obj->nr_programs; | |
370 | ||
371 | progs = realloc(progs, sizeof(progs[0]) * (nr_progs + 1)); | |
372 | if (!progs) { | |
373 | /* | |
374 | * In this case the original obj->programs | |
375 | * is still valid, so don't need special treat for | |
376 | * bpf_close_object(). | |
377 | */ | |
88cda1c9 MKL |
378 | pr_warning("failed to alloc a new program under section '%s'\n", |
379 | section_name); | |
a5b8bd47 WN |
380 | bpf_program__exit(&prog); |
381 | return -ENOMEM; | |
382 | } | |
383 | ||
384 | pr_debug("found program %s\n", prog.section_name); | |
385 | obj->programs = progs; | |
386 | obj->nr_programs = nr_progs + 1; | |
aa9b1ac3 | 387 | prog.obj = obj; |
a5b8bd47 WN |
388 | progs[nr_progs] = prog; |
389 | return 0; | |
390 | } | |
391 | ||
88cda1c9 MKL |
392 | static int |
393 | bpf_object__init_prog_names(struct bpf_object *obj) | |
394 | { | |
395 | Elf_Data *symbols = obj->efile.symbols; | |
396 | struct bpf_program *prog; | |
397 | size_t pi, si; | |
398 | ||
399 | for (pi = 0; pi < obj->nr_programs; pi++) { | |
48cca7e4 | 400 | const char *name = NULL; |
88cda1c9 MKL |
401 | |
402 | prog = &obj->programs[pi]; | |
48cca7e4 AS |
403 | if (prog->idx == obj->efile.text_shndx) { |
404 | name = ".text"; | |
405 | goto skip_search; | |
406 | } | |
88cda1c9 MKL |
407 | |
408 | for (si = 0; si < symbols->d_size / sizeof(GElf_Sym) && !name; | |
409 | si++) { | |
410 | GElf_Sym sym; | |
411 | ||
412 | if (!gelf_getsym(symbols, si, &sym)) | |
413 | continue; | |
414 | if (sym.st_shndx != prog->idx) | |
415 | continue; | |
fe4d44b2 RG |
416 | if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL) |
417 | continue; | |
88cda1c9 MKL |
418 | |
419 | name = elf_strptr(obj->efile.elf, | |
420 | obj->efile.strtabidx, | |
421 | sym.st_name); | |
422 | if (!name) { | |
423 | pr_warning("failed to get sym name string for prog %s\n", | |
424 | prog->section_name); | |
425 | return -LIBBPF_ERRNO__LIBELF; | |
426 | } | |
427 | } | |
428 | ||
429 | if (!name) { | |
430 | pr_warning("failed to find sym for prog %s\n", | |
431 | prog->section_name); | |
432 | return -EINVAL; | |
433 | } | |
48cca7e4 | 434 | skip_search: |
88cda1c9 MKL |
435 | prog->name = strdup(name); |
436 | if (!prog->name) { | |
437 | pr_warning("failed to allocate memory for prog sym %s\n", | |
438 | name); | |
439 | return -ENOMEM; | |
440 | } | |
441 | } | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
6c956392 WN |
446 | static struct bpf_object *bpf_object__new(const char *path, |
447 | void *obj_buf, | |
448 | size_t obj_buf_sz) | |
1a5e3fb1 WN |
449 | { |
450 | struct bpf_object *obj; | |
451 | ||
452 | obj = calloc(1, sizeof(struct bpf_object) + strlen(path) + 1); | |
453 | if (!obj) { | |
454 | pr_warning("alloc memory failed for %s\n", path); | |
6371ca3b | 455 | return ERR_PTR(-ENOMEM); |
1a5e3fb1 WN |
456 | } |
457 | ||
458 | strcpy(obj->path, path); | |
459 | obj->efile.fd = -1; | |
6c956392 WN |
460 | |
461 | /* | |
462 | * Caller of this function should also calls | |
463 | * bpf_object__elf_finish() after data collection to return | |
464 | * obj_buf to user. If not, we should duplicate the buffer to | |
465 | * avoid user freeing them before elf finish. | |
466 | */ | |
467 | obj->efile.obj_buf = obj_buf; | |
468 | obj->efile.obj_buf_sz = obj_buf_sz; | |
666810e8 | 469 | obj->efile.maps_shndx = -1; |
6c956392 | 470 | |
52d3352e | 471 | obj->loaded = false; |
9a208eff WN |
472 | |
473 | INIT_LIST_HEAD(&obj->list); | |
474 | list_add(&obj->list, &bpf_objects_list); | |
1a5e3fb1 WN |
475 | return obj; |
476 | } | |
477 | ||
478 | static void bpf_object__elf_finish(struct bpf_object *obj) | |
479 | { | |
480 | if (!obj_elf_valid(obj)) | |
481 | return; | |
482 | ||
483 | if (obj->efile.elf) { | |
484 | elf_end(obj->efile.elf); | |
485 | obj->efile.elf = NULL; | |
486 | } | |
bec7d68c | 487 | obj->efile.symbols = NULL; |
b62f06e8 WN |
488 | |
489 | zfree(&obj->efile.reloc); | |
490 | obj->efile.nr_reloc = 0; | |
1a5e3fb1 | 491 | zclose(obj->efile.fd); |
6c956392 WN |
492 | obj->efile.obj_buf = NULL; |
493 | obj->efile.obj_buf_sz = 0; | |
1a5e3fb1 WN |
494 | } |
495 | ||
496 | static int bpf_object__elf_init(struct bpf_object *obj) | |
497 | { | |
498 | int err = 0; | |
499 | GElf_Ehdr *ep; | |
500 | ||
501 | if (obj_elf_valid(obj)) { | |
502 | pr_warning("elf init: internal error\n"); | |
6371ca3b | 503 | return -LIBBPF_ERRNO__LIBELF; |
1a5e3fb1 WN |
504 | } |
505 | ||
6c956392 WN |
506 | if (obj->efile.obj_buf_sz > 0) { |
507 | /* | |
508 | * obj_buf should have been validated by | |
509 | * bpf_object__open_buffer(). | |
510 | */ | |
511 | obj->efile.elf = elf_memory(obj->efile.obj_buf, | |
512 | obj->efile.obj_buf_sz); | |
513 | } else { | |
514 | obj->efile.fd = open(obj->path, O_RDONLY); | |
515 | if (obj->efile.fd < 0) { | |
516 | pr_warning("failed to open %s: %s\n", obj->path, | |
517 | strerror(errno)); | |
518 | return -errno; | |
519 | } | |
520 | ||
521 | obj->efile.elf = elf_begin(obj->efile.fd, | |
522 | LIBBPF_ELF_C_READ_MMAP, | |
523 | NULL); | |
1a5e3fb1 WN |
524 | } |
525 | ||
1a5e3fb1 WN |
526 | if (!obj->efile.elf) { |
527 | pr_warning("failed to open %s as ELF file\n", | |
528 | obj->path); | |
6371ca3b | 529 | err = -LIBBPF_ERRNO__LIBELF; |
1a5e3fb1 WN |
530 | goto errout; |
531 | } | |
532 | ||
533 | if (!gelf_getehdr(obj->efile.elf, &obj->efile.ehdr)) { | |
534 | pr_warning("failed to get EHDR from %s\n", | |
535 | obj->path); | |
6371ca3b | 536 | err = -LIBBPF_ERRNO__FORMAT; |
1a5e3fb1 WN |
537 | goto errout; |
538 | } | |
539 | ep = &obj->efile.ehdr; | |
540 | ||
9b16137a WN |
541 | /* Old LLVM set e_machine to EM_NONE */ |
542 | if ((ep->e_type != ET_REL) || (ep->e_machine && (ep->e_machine != EM_BPF))) { | |
1a5e3fb1 WN |
543 | pr_warning("%s is not an eBPF object file\n", |
544 | obj->path); | |
6371ca3b | 545 | err = -LIBBPF_ERRNO__FORMAT; |
1a5e3fb1 WN |
546 | goto errout; |
547 | } | |
548 | ||
549 | return 0; | |
550 | errout: | |
551 | bpf_object__elf_finish(obj); | |
552 | return err; | |
553 | } | |
554 | ||
cc4228d5 WN |
555 | static int |
556 | bpf_object__check_endianness(struct bpf_object *obj) | |
557 | { | |
558 | static unsigned int const endian = 1; | |
559 | ||
560 | switch (obj->efile.ehdr.e_ident[EI_DATA]) { | |
561 | case ELFDATA2LSB: | |
562 | /* We are big endian, BPF obj is little endian. */ | |
563 | if (*(unsigned char const *)&endian != 1) | |
564 | goto mismatch; | |
565 | break; | |
566 | ||
567 | case ELFDATA2MSB: | |
568 | /* We are little endian, BPF obj is big endian. */ | |
569 | if (*(unsigned char const *)&endian != 0) | |
570 | goto mismatch; | |
571 | break; | |
572 | default: | |
6371ca3b | 573 | return -LIBBPF_ERRNO__ENDIAN; |
cc4228d5 WN |
574 | } |
575 | ||
576 | return 0; | |
577 | ||
578 | mismatch: | |
579 | pr_warning("Error: endianness mismatch.\n"); | |
6371ca3b | 580 | return -LIBBPF_ERRNO__ENDIAN; |
cc4228d5 WN |
581 | } |
582 | ||
cb1e5e96 WN |
583 | static int |
584 | bpf_object__init_license(struct bpf_object *obj, | |
585 | void *data, size_t size) | |
586 | { | |
587 | memcpy(obj->license, data, | |
588 | min(size, sizeof(obj->license) - 1)); | |
589 | pr_debug("license of %s is %s\n", obj->path, obj->license); | |
590 | return 0; | |
591 | } | |
592 | ||
593 | static int | |
594 | bpf_object__init_kversion(struct bpf_object *obj, | |
595 | void *data, size_t size) | |
596 | { | |
597 | u32 kver; | |
598 | ||
599 | if (size != sizeof(kver)) { | |
600 | pr_warning("invalid kver section in %s\n", obj->path); | |
6371ca3b | 601 | return -LIBBPF_ERRNO__FORMAT; |
cb1e5e96 WN |
602 | } |
603 | memcpy(&kver, data, sizeof(kver)); | |
604 | obj->kern_version = kver; | |
605 | pr_debug("kernel version of %s is %x\n", obj->path, | |
606 | obj->kern_version); | |
607 | return 0; | |
608 | } | |
609 | ||
4708bbda EL |
610 | static int compare_bpf_map(const void *_a, const void *_b) |
611 | { | |
612 | const struct bpf_map *a = _a; | |
613 | const struct bpf_map *b = _b; | |
9d759a9b | 614 | |
4708bbda | 615 | return a->offset - b->offset; |
0b3d1efa WN |
616 | } |
617 | ||
973170e6 | 618 | static int |
4708bbda | 619 | bpf_object__init_maps(struct bpf_object *obj) |
561bbcca | 620 | { |
b13c5c14 | 621 | int i, map_idx, map_def_sz, nr_maps = 0; |
4708bbda EL |
622 | Elf_Scn *scn; |
623 | Elf_Data *data; | |
561bbcca WN |
624 | Elf_Data *symbols = obj->efile.symbols; |
625 | ||
4708bbda EL |
626 | if (obj->efile.maps_shndx < 0) |
627 | return -EINVAL; | |
628 | if (!symbols) | |
629 | return -EINVAL; | |
630 | ||
631 | scn = elf_getscn(obj->efile.elf, obj->efile.maps_shndx); | |
632 | if (scn) | |
633 | data = elf_getdata(scn, NULL); | |
634 | if (!scn || !data) { | |
635 | pr_warning("failed to get Elf_Data from map section %d\n", | |
636 | obj->efile.maps_shndx); | |
973170e6 | 637 | return -EINVAL; |
4708bbda | 638 | } |
561bbcca | 639 | |
4708bbda EL |
640 | /* |
641 | * Count number of maps. Each map has a name. | |
642 | * Array of maps is not supported: only the first element is | |
643 | * considered. | |
644 | * | |
645 | * TODO: Detect array of map and report error. | |
646 | */ | |
561bbcca WN |
647 | for (i = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) { |
648 | GElf_Sym sym; | |
4708bbda EL |
649 | |
650 | if (!gelf_getsym(symbols, i, &sym)) | |
651 | continue; | |
652 | if (sym.st_shndx != obj->efile.maps_shndx) | |
653 | continue; | |
654 | nr_maps++; | |
655 | } | |
656 | ||
657 | /* Alloc obj->maps and fill nr_maps. */ | |
658 | pr_debug("maps in %s: %d maps in %zd bytes\n", obj->path, | |
659 | nr_maps, data->d_size); | |
660 | ||
661 | if (!nr_maps) | |
662 | return 0; | |
663 | ||
b13c5c14 CG |
664 | /* Assume equally sized map definitions */ |
665 | map_def_sz = data->d_size / nr_maps; | |
666 | if (!data->d_size || (data->d_size % nr_maps) != 0) { | |
667 | pr_warning("unable to determine map definition size " | |
668 | "section %s, %d maps in %zd bytes\n", | |
669 | obj->path, nr_maps, data->d_size); | |
670 | return -EINVAL; | |
671 | } | |
672 | ||
4708bbda EL |
673 | obj->maps = calloc(nr_maps, sizeof(obj->maps[0])); |
674 | if (!obj->maps) { | |
675 | pr_warning("alloc maps for object failed\n"); | |
676 | return -ENOMEM; | |
677 | } | |
678 | obj->nr_maps = nr_maps; | |
679 | ||
680 | /* | |
681 | * fill all fd with -1 so won't close incorrect | |
682 | * fd (fd=0 is stdin) when failure (zclose won't close | |
683 | * negative fd)). | |
684 | */ | |
685 | for (i = 0; i < nr_maps; i++) | |
686 | obj->maps[i].fd = -1; | |
687 | ||
688 | /* | |
689 | * Fill obj->maps using data in "maps" section. | |
690 | */ | |
691 | for (i = 0, map_idx = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) { | |
692 | GElf_Sym sym; | |
561bbcca | 693 | const char *map_name; |
4708bbda | 694 | struct bpf_map_def *def; |
561bbcca WN |
695 | |
696 | if (!gelf_getsym(symbols, i, &sym)) | |
697 | continue; | |
666810e8 | 698 | if (sym.st_shndx != obj->efile.maps_shndx) |
561bbcca WN |
699 | continue; |
700 | ||
701 | map_name = elf_strptr(obj->efile.elf, | |
77ba9a5b | 702 | obj->efile.strtabidx, |
561bbcca | 703 | sym.st_name); |
4708bbda | 704 | obj->maps[map_idx].offset = sym.st_value; |
b13c5c14 | 705 | if (sym.st_value + map_def_sz > data->d_size) { |
4708bbda EL |
706 | pr_warning("corrupted maps section in %s: last map \"%s\" too small\n", |
707 | obj->path, map_name); | |
708 | return -EINVAL; | |
561bbcca | 709 | } |
4708bbda | 710 | |
561bbcca | 711 | obj->maps[map_idx].name = strdup(map_name); |
973170e6 WN |
712 | if (!obj->maps[map_idx].name) { |
713 | pr_warning("failed to alloc map name\n"); | |
714 | return -ENOMEM; | |
715 | } | |
4708bbda | 716 | pr_debug("map %d is \"%s\"\n", map_idx, |
561bbcca | 717 | obj->maps[map_idx].name); |
4708bbda | 718 | def = (struct bpf_map_def *)(data->d_buf + sym.st_value); |
b13c5c14 CG |
719 | /* |
720 | * If the definition of the map in the object file fits in | |
721 | * bpf_map_def, copy it. Any extra fields in our version | |
722 | * of bpf_map_def will default to zero as a result of the | |
723 | * calloc above. | |
724 | */ | |
725 | if (map_def_sz <= sizeof(struct bpf_map_def)) { | |
726 | memcpy(&obj->maps[map_idx].def, def, map_def_sz); | |
727 | } else { | |
728 | /* | |
729 | * Here the map structure being read is bigger than what | |
730 | * we expect, truncate if the excess bits are all zero. | |
731 | * If they are not zero, reject this map as | |
732 | * incompatible. | |
733 | */ | |
734 | char *b; | |
735 | for (b = ((char *)def) + sizeof(struct bpf_map_def); | |
736 | b < ((char *)def) + map_def_sz; b++) { | |
737 | if (*b != 0) { | |
738 | pr_warning("maps section in %s: \"%s\" " | |
739 | "has unrecognized, non-zero " | |
740 | "options\n", | |
741 | obj->path, map_name); | |
742 | return -EINVAL; | |
743 | } | |
744 | } | |
745 | memcpy(&obj->maps[map_idx].def, def, | |
746 | sizeof(struct bpf_map_def)); | |
747 | } | |
4708bbda | 748 | map_idx++; |
561bbcca | 749 | } |
4708bbda EL |
750 | |
751 | qsort(obj->maps, obj->nr_maps, sizeof(obj->maps[0]), compare_bpf_map); | |
b13c5c14 | 752 | return 0; |
561bbcca WN |
753 | } |
754 | ||
e3d91b0c JDB |
755 | static bool section_have_execinstr(struct bpf_object *obj, int idx) |
756 | { | |
757 | Elf_Scn *scn; | |
758 | GElf_Shdr sh; | |
759 | ||
760 | scn = elf_getscn(obj->efile.elf, idx); | |
761 | if (!scn) | |
762 | return false; | |
763 | ||
764 | if (gelf_getshdr(scn, &sh) != &sh) | |
765 | return false; | |
766 | ||
767 | if (sh.sh_flags & SHF_EXECINSTR) | |
768 | return true; | |
769 | ||
770 | return false; | |
771 | } | |
772 | ||
29603665 WN |
773 | static int bpf_object__elf_collect(struct bpf_object *obj) |
774 | { | |
775 | Elf *elf = obj->efile.elf; | |
776 | GElf_Ehdr *ep = &obj->efile.ehdr; | |
777 | Elf_Scn *scn = NULL; | |
666810e8 | 778 | int idx = 0, err = 0; |
29603665 WN |
779 | |
780 | /* Elf is corrupted/truncated, avoid calling elf_strptr. */ | |
781 | if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) { | |
782 | pr_warning("failed to get e_shstrndx from %s\n", | |
783 | obj->path); | |
6371ca3b | 784 | return -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
785 | } |
786 | ||
787 | while ((scn = elf_nextscn(elf, scn)) != NULL) { | |
788 | char *name; | |
789 | GElf_Shdr sh; | |
790 | Elf_Data *data; | |
791 | ||
792 | idx++; | |
793 | if (gelf_getshdr(scn, &sh) != &sh) { | |
077c066a JDB |
794 | pr_warning("failed to get section(%d) header from %s\n", |
795 | idx, obj->path); | |
6371ca3b | 796 | err = -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
797 | goto out; |
798 | } | |
799 | ||
800 | name = elf_strptr(elf, ep->e_shstrndx, sh.sh_name); | |
801 | if (!name) { | |
077c066a JDB |
802 | pr_warning("failed to get section(%d) name from %s\n", |
803 | idx, obj->path); | |
6371ca3b | 804 | err = -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
805 | goto out; |
806 | } | |
807 | ||
808 | data = elf_getdata(scn, 0); | |
809 | if (!data) { | |
077c066a JDB |
810 | pr_warning("failed to get section(%d) data from %s(%s)\n", |
811 | idx, name, obj->path); | |
6371ca3b | 812 | err = -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
813 | goto out; |
814 | } | |
077c066a JDB |
815 | pr_debug("section(%d) %s, size %ld, link %d, flags %lx, type=%d\n", |
816 | idx, name, (unsigned long)data->d_size, | |
29603665 WN |
817 | (int)sh.sh_link, (unsigned long)sh.sh_flags, |
818 | (int)sh.sh_type); | |
cb1e5e96 WN |
819 | |
820 | if (strcmp(name, "license") == 0) | |
821 | err = bpf_object__init_license(obj, | |
822 | data->d_buf, | |
823 | data->d_size); | |
824 | else if (strcmp(name, "version") == 0) | |
825 | err = bpf_object__init_kversion(obj, | |
826 | data->d_buf, | |
827 | data->d_size); | |
4708bbda | 828 | else if (strcmp(name, "maps") == 0) |
666810e8 | 829 | obj->efile.maps_shndx = idx; |
8a138aed MKL |
830 | else if (strcmp(name, BTF_ELF_SEC) == 0) { |
831 | obj->btf = btf__new(data->d_buf, data->d_size, | |
832 | __pr_debug); | |
833 | if (IS_ERR(obj->btf)) { | |
834 | pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n", | |
835 | BTF_ELF_SEC, PTR_ERR(obj->btf)); | |
836 | obj->btf = NULL; | |
837 | } | |
838 | } else if (sh.sh_type == SHT_SYMTAB) { | |
bec7d68c WN |
839 | if (obj->efile.symbols) { |
840 | pr_warning("bpf: multiple SYMTAB in %s\n", | |
841 | obj->path); | |
6371ca3b | 842 | err = -LIBBPF_ERRNO__FORMAT; |
77ba9a5b | 843 | } else { |
bec7d68c | 844 | obj->efile.symbols = data; |
77ba9a5b WN |
845 | obj->efile.strtabidx = sh.sh_link; |
846 | } | |
a5b8bd47 WN |
847 | } else if ((sh.sh_type == SHT_PROGBITS) && |
848 | (sh.sh_flags & SHF_EXECINSTR) && | |
849 | (data->d_size > 0)) { | |
48cca7e4 AS |
850 | if (strcmp(name, ".text") == 0) |
851 | obj->efile.text_shndx = idx; | |
a5b8bd47 WN |
852 | err = bpf_object__add_program(obj, data->d_buf, |
853 | data->d_size, name, idx); | |
854 | if (err) { | |
6371ca3b WN |
855 | char errmsg[STRERR_BUFSIZE]; |
856 | ||
a5b8bd47 WN |
857 | strerror_r(-err, errmsg, sizeof(errmsg)); |
858 | pr_warning("failed to alloc program %s (%s): %s", | |
859 | name, obj->path, errmsg); | |
860 | } | |
b62f06e8 WN |
861 | } else if (sh.sh_type == SHT_REL) { |
862 | void *reloc = obj->efile.reloc; | |
863 | int nr_reloc = obj->efile.nr_reloc + 1; | |
e3d91b0c JDB |
864 | int sec = sh.sh_info; /* points to other section */ |
865 | ||
866 | /* Only do relo for section with exec instructions */ | |
867 | if (!section_have_execinstr(obj, sec)) { | |
868 | pr_debug("skip relo %s(%d) for section(%d)\n", | |
869 | name, idx, sec); | |
870 | continue; | |
871 | } | |
b62f06e8 WN |
872 | |
873 | reloc = realloc(reloc, | |
874 | sizeof(*obj->efile.reloc) * nr_reloc); | |
875 | if (!reloc) { | |
876 | pr_warning("realloc failed\n"); | |
877 | err = -ENOMEM; | |
878 | } else { | |
879 | int n = nr_reloc - 1; | |
880 | ||
881 | obj->efile.reloc = reloc; | |
882 | obj->efile.nr_reloc = nr_reloc; | |
883 | ||
884 | obj->efile.reloc[n].shdr = sh; | |
885 | obj->efile.reloc[n].data = data; | |
886 | } | |
077c066a JDB |
887 | } else { |
888 | pr_debug("skip section(%d) %s\n", idx, name); | |
bec7d68c | 889 | } |
cb1e5e96 WN |
890 | if (err) |
891 | goto out; | |
29603665 | 892 | } |
561bbcca | 893 | |
77ba9a5b WN |
894 | if (!obj->efile.strtabidx || obj->efile.strtabidx >= idx) { |
895 | pr_warning("Corrupted ELF file: index of strtab invalid\n"); | |
896 | return LIBBPF_ERRNO__FORMAT; | |
897 | } | |
88cda1c9 | 898 | if (obj->efile.maps_shndx >= 0) { |
4708bbda | 899 | err = bpf_object__init_maps(obj); |
88cda1c9 MKL |
900 | if (err) |
901 | goto out; | |
902 | } | |
903 | err = bpf_object__init_prog_names(obj); | |
29603665 WN |
904 | out: |
905 | return err; | |
906 | } | |
907 | ||
34090915 WN |
908 | static struct bpf_program * |
909 | bpf_object__find_prog_by_idx(struct bpf_object *obj, int idx) | |
910 | { | |
911 | struct bpf_program *prog; | |
912 | size_t i; | |
913 | ||
914 | for (i = 0; i < obj->nr_programs; i++) { | |
915 | prog = &obj->programs[i]; | |
916 | if (prog->idx == idx) | |
917 | return prog; | |
918 | } | |
919 | return NULL; | |
920 | } | |
921 | ||
922 | static int | |
48cca7e4 AS |
923 | bpf_program__collect_reloc(struct bpf_program *prog, GElf_Shdr *shdr, |
924 | Elf_Data *data, struct bpf_object *obj) | |
34090915 | 925 | { |
48cca7e4 AS |
926 | Elf_Data *symbols = obj->efile.symbols; |
927 | int text_shndx = obj->efile.text_shndx; | |
928 | int maps_shndx = obj->efile.maps_shndx; | |
929 | struct bpf_map *maps = obj->maps; | |
930 | size_t nr_maps = obj->nr_maps; | |
34090915 WN |
931 | int i, nrels; |
932 | ||
933 | pr_debug("collecting relocating info for: '%s'\n", | |
934 | prog->section_name); | |
935 | nrels = shdr->sh_size / shdr->sh_entsize; | |
936 | ||
937 | prog->reloc_desc = malloc(sizeof(*prog->reloc_desc) * nrels); | |
938 | if (!prog->reloc_desc) { | |
939 | pr_warning("failed to alloc memory in relocation\n"); | |
940 | return -ENOMEM; | |
941 | } | |
942 | prog->nr_reloc = nrels; | |
943 | ||
944 | for (i = 0; i < nrels; i++) { | |
945 | GElf_Sym sym; | |
946 | GElf_Rel rel; | |
947 | unsigned int insn_idx; | |
948 | struct bpf_insn *insns = prog->insns; | |
949 | size_t map_idx; | |
950 | ||
951 | if (!gelf_getrel(data, i, &rel)) { | |
952 | pr_warning("relocation: failed to get %d reloc\n", i); | |
6371ca3b | 953 | return -LIBBPF_ERRNO__FORMAT; |
34090915 WN |
954 | } |
955 | ||
34090915 WN |
956 | if (!gelf_getsym(symbols, |
957 | GELF_R_SYM(rel.r_info), | |
958 | &sym)) { | |
959 | pr_warning("relocation: symbol %"PRIx64" not found\n", | |
960 | GELF_R_SYM(rel.r_info)); | |
6371ca3b | 961 | return -LIBBPF_ERRNO__FORMAT; |
34090915 | 962 | } |
7d9890ef DM |
963 | pr_debug("relo for %lld value %lld name %d\n", |
964 | (long long) (rel.r_info >> 32), | |
965 | (long long) sym.st_value, sym.st_name); | |
34090915 | 966 | |
48cca7e4 | 967 | if (sym.st_shndx != maps_shndx && sym.st_shndx != text_shndx) { |
666810e8 WN |
968 | pr_warning("Program '%s' contains non-map related relo data pointing to section %u\n", |
969 | prog->section_name, sym.st_shndx); | |
970 | return -LIBBPF_ERRNO__RELOC; | |
971 | } | |
972 | ||
973 | insn_idx = rel.r_offset / sizeof(struct bpf_insn); | |
974 | pr_debug("relocation: insn_idx=%u\n", insn_idx); | |
975 | ||
48cca7e4 AS |
976 | if (insns[insn_idx].code == (BPF_JMP | BPF_CALL)) { |
977 | if (insns[insn_idx].src_reg != BPF_PSEUDO_CALL) { | |
978 | pr_warning("incorrect bpf_call opcode\n"); | |
979 | return -LIBBPF_ERRNO__RELOC; | |
980 | } | |
981 | prog->reloc_desc[i].type = RELO_CALL; | |
982 | prog->reloc_desc[i].insn_idx = insn_idx; | |
983 | prog->reloc_desc[i].text_off = sym.st_value; | |
984 | continue; | |
985 | } | |
986 | ||
34090915 WN |
987 | if (insns[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) { |
988 | pr_warning("bpf: relocation: invalid relo for insns[%d].code 0x%x\n", | |
989 | insn_idx, insns[insn_idx].code); | |
6371ca3b | 990 | return -LIBBPF_ERRNO__RELOC; |
34090915 WN |
991 | } |
992 | ||
94e5adec JS |
993 | /* TODO: 'maps' is sorted. We can use bsearch to make it faster. */ |
994 | for (map_idx = 0; map_idx < nr_maps; map_idx++) { | |
995 | if (maps[map_idx].offset == sym.st_value) { | |
996 | pr_debug("relocation: find map %zd (%s) for insn %u\n", | |
997 | map_idx, maps[map_idx].name, insn_idx); | |
998 | break; | |
999 | } | |
1000 | } | |
1001 | ||
34090915 WN |
1002 | if (map_idx >= nr_maps) { |
1003 | pr_warning("bpf relocation: map_idx %d large than %d\n", | |
1004 | (int)map_idx, (int)nr_maps - 1); | |
6371ca3b | 1005 | return -LIBBPF_ERRNO__RELOC; |
34090915 WN |
1006 | } |
1007 | ||
48cca7e4 | 1008 | prog->reloc_desc[i].type = RELO_LD64; |
34090915 WN |
1009 | prog->reloc_desc[i].insn_idx = insn_idx; |
1010 | prog->reloc_desc[i].map_idx = map_idx; | |
1011 | } | |
1012 | return 0; | |
1013 | } | |
1014 | ||
8a138aed MKL |
1015 | static int bpf_map_find_btf_info(struct bpf_map *map, const struct btf *btf) |
1016 | { | |
1017 | struct bpf_map_def *def = &map->def; | |
1018 | const size_t max_name = 256; | |
1019 | int64_t key_size, value_size; | |
1020 | int32_t key_id, value_id; | |
1021 | char name[max_name]; | |
1022 | ||
1023 | /* Find key type by name from BTF */ | |
1024 | if (snprintf(name, max_name, "%s_key", map->name) == max_name) { | |
1025 | pr_warning("map:%s length of BTF key_type:%s_key is too long\n", | |
1026 | map->name, map->name); | |
1027 | return -EINVAL; | |
1028 | } | |
1029 | ||
1030 | key_id = btf__find_by_name(btf, name); | |
1031 | if (key_id < 0) { | |
1032 | pr_debug("map:%s key_type:%s cannot be found in BTF\n", | |
1033 | map->name, name); | |
1034 | return key_id; | |
1035 | } | |
1036 | ||
1037 | key_size = btf__resolve_size(btf, key_id); | |
1038 | if (key_size < 0) { | |
1039 | pr_warning("map:%s key_type:%s cannot get the BTF type_size\n", | |
1040 | map->name, name); | |
1041 | return key_size; | |
1042 | } | |
1043 | ||
1044 | if (def->key_size != key_size) { | |
a1c81810 SB |
1045 | pr_warning("map:%s key_type:%s has BTF type_size:%u != key_size:%u\n", |
1046 | map->name, name, (unsigned int)key_size, def->key_size); | |
8a138aed MKL |
1047 | return -EINVAL; |
1048 | } | |
1049 | ||
1050 | /* Find value type from BTF */ | |
1051 | if (snprintf(name, max_name, "%s_value", map->name) == max_name) { | |
1052 | pr_warning("map:%s length of BTF value_type:%s_value is too long\n", | |
1053 | map->name, map->name); | |
1054 | return -EINVAL; | |
1055 | } | |
1056 | ||
1057 | value_id = btf__find_by_name(btf, name); | |
1058 | if (value_id < 0) { | |
1059 | pr_debug("map:%s value_type:%s cannot be found in BTF\n", | |
1060 | map->name, name); | |
1061 | return value_id; | |
1062 | } | |
1063 | ||
1064 | value_size = btf__resolve_size(btf, value_id); | |
1065 | if (value_size < 0) { | |
1066 | pr_warning("map:%s value_type:%s cannot get the BTF type_size\n", | |
1067 | map->name, name); | |
1068 | return value_size; | |
1069 | } | |
1070 | ||
1071 | if (def->value_size != value_size) { | |
a1c81810 SB |
1072 | pr_warning("map:%s value_type:%s has BTF type_size:%u != value_size:%u\n", |
1073 | map->name, name, (unsigned int)value_size, def->value_size); | |
8a138aed MKL |
1074 | return -EINVAL; |
1075 | } | |
1076 | ||
61746dbe MKL |
1077 | map->btf_key_type_id = key_id; |
1078 | map->btf_value_type_id = value_id; | |
8a138aed MKL |
1079 | |
1080 | return 0; | |
1081 | } | |
1082 | ||
52d3352e WN |
1083 | static int |
1084 | bpf_object__create_maps(struct bpf_object *obj) | |
1085 | { | |
8a138aed | 1086 | struct bpf_create_map_attr create_attr = {}; |
52d3352e | 1087 | unsigned int i; |
8a138aed | 1088 | int err; |
52d3352e | 1089 | |
9d759a9b | 1090 | for (i = 0; i < obj->nr_maps; i++) { |
8a138aed MKL |
1091 | struct bpf_map *map = &obj->maps[i]; |
1092 | struct bpf_map_def *def = &map->def; | |
1093 | int *pfd = &map->fd; | |
1094 | ||
1095 | create_attr.name = map->name; | |
f0307a7e | 1096 | create_attr.map_ifindex = map->map_ifindex; |
8a138aed MKL |
1097 | create_attr.map_type = def->type; |
1098 | create_attr.map_flags = def->map_flags; | |
1099 | create_attr.key_size = def->key_size; | |
1100 | create_attr.value_size = def->value_size; | |
1101 | create_attr.max_entries = def->max_entries; | |
1102 | create_attr.btf_fd = 0; | |
61746dbe MKL |
1103 | create_attr.btf_key_type_id = 0; |
1104 | create_attr.btf_value_type_id = 0; | |
8a138aed MKL |
1105 | |
1106 | if (obj->btf && !bpf_map_find_btf_info(map, obj->btf)) { | |
1107 | create_attr.btf_fd = btf__fd(obj->btf); | |
61746dbe MKL |
1108 | create_attr.btf_key_type_id = map->btf_key_type_id; |
1109 | create_attr.btf_value_type_id = map->btf_value_type_id; | |
8a138aed MKL |
1110 | } |
1111 | ||
1112 | *pfd = bpf_create_map_xattr(&create_attr); | |
61746dbe | 1113 | if (*pfd < 0 && create_attr.btf_key_type_id) { |
8a138aed MKL |
1114 | pr_warning("Error in bpf_create_map_xattr(%s):%s(%d). Retrying without BTF.\n", |
1115 | map->name, strerror(errno), errno); | |
1116 | create_attr.btf_fd = 0; | |
61746dbe MKL |
1117 | create_attr.btf_key_type_id = 0; |
1118 | create_attr.btf_value_type_id = 0; | |
1119 | map->btf_key_type_id = 0; | |
1120 | map->btf_value_type_id = 0; | |
8a138aed MKL |
1121 | *pfd = bpf_create_map_xattr(&create_attr); |
1122 | } | |
1123 | ||
52d3352e WN |
1124 | if (*pfd < 0) { |
1125 | size_t j; | |
52d3352e | 1126 | |
8a138aed | 1127 | err = *pfd; |
49bf4b36 | 1128 | pr_warning("failed to create map (name: '%s'): %s\n", |
8a138aed | 1129 | map->name, |
52d3352e WN |
1130 | strerror(errno)); |
1131 | for (j = 0; j < i; j++) | |
9d759a9b | 1132 | zclose(obj->maps[j].fd); |
52d3352e WN |
1133 | return err; |
1134 | } | |
8a138aed | 1135 | pr_debug("create map %s: fd=%d\n", map->name, *pfd); |
52d3352e WN |
1136 | } |
1137 | ||
52d3352e WN |
1138 | return 0; |
1139 | } | |
1140 | ||
48cca7e4 AS |
1141 | static int |
1142 | bpf_program__reloc_text(struct bpf_program *prog, struct bpf_object *obj, | |
1143 | struct reloc_desc *relo) | |
1144 | { | |
1145 | struct bpf_insn *insn, *new_insn; | |
1146 | struct bpf_program *text; | |
1147 | size_t new_cnt; | |
1148 | ||
1149 | if (relo->type != RELO_CALL) | |
1150 | return -LIBBPF_ERRNO__RELOC; | |
1151 | ||
1152 | if (prog->idx == obj->efile.text_shndx) { | |
1153 | pr_warning("relo in .text insn %d into off %d\n", | |
1154 | relo->insn_idx, relo->text_off); | |
1155 | return -LIBBPF_ERRNO__RELOC; | |
1156 | } | |
1157 | ||
1158 | if (prog->main_prog_cnt == 0) { | |
1159 | text = bpf_object__find_prog_by_idx(obj, obj->efile.text_shndx); | |
1160 | if (!text) { | |
1161 | pr_warning("no .text section found yet relo into text exist\n"); | |
1162 | return -LIBBPF_ERRNO__RELOC; | |
1163 | } | |
1164 | new_cnt = prog->insns_cnt + text->insns_cnt; | |
1165 | new_insn = realloc(prog->insns, new_cnt * sizeof(*insn)); | |
1166 | if (!new_insn) { | |
1167 | pr_warning("oom in prog realloc\n"); | |
1168 | return -ENOMEM; | |
1169 | } | |
1170 | memcpy(new_insn + prog->insns_cnt, text->insns, | |
1171 | text->insns_cnt * sizeof(*insn)); | |
1172 | prog->insns = new_insn; | |
1173 | prog->main_prog_cnt = prog->insns_cnt; | |
1174 | prog->insns_cnt = new_cnt; | |
b1a2ce82 JC |
1175 | pr_debug("added %zd insn from %s to prog %s\n", |
1176 | text->insns_cnt, text->section_name, | |
1177 | prog->section_name); | |
48cca7e4 AS |
1178 | } |
1179 | insn = &prog->insns[relo->insn_idx]; | |
1180 | insn->imm += prog->main_prog_cnt - relo->insn_idx; | |
48cca7e4 AS |
1181 | return 0; |
1182 | } | |
1183 | ||
8a47a6c5 | 1184 | static int |
9d759a9b | 1185 | bpf_program__relocate(struct bpf_program *prog, struct bpf_object *obj) |
8a47a6c5 | 1186 | { |
48cca7e4 | 1187 | int i, err; |
8a47a6c5 WN |
1188 | |
1189 | if (!prog || !prog->reloc_desc) | |
1190 | return 0; | |
1191 | ||
1192 | for (i = 0; i < prog->nr_reloc; i++) { | |
48cca7e4 AS |
1193 | if (prog->reloc_desc[i].type == RELO_LD64) { |
1194 | struct bpf_insn *insns = prog->insns; | |
1195 | int insn_idx, map_idx; | |
8a47a6c5 | 1196 | |
48cca7e4 AS |
1197 | insn_idx = prog->reloc_desc[i].insn_idx; |
1198 | map_idx = prog->reloc_desc[i].map_idx; | |
8a47a6c5 | 1199 | |
48cca7e4 AS |
1200 | if (insn_idx >= (int)prog->insns_cnt) { |
1201 | pr_warning("relocation out of range: '%s'\n", | |
1202 | prog->section_name); | |
1203 | return -LIBBPF_ERRNO__RELOC; | |
1204 | } | |
1205 | insns[insn_idx].src_reg = BPF_PSEUDO_MAP_FD; | |
1206 | insns[insn_idx].imm = obj->maps[map_idx].fd; | |
1207 | } else { | |
1208 | err = bpf_program__reloc_text(prog, obj, | |
1209 | &prog->reloc_desc[i]); | |
1210 | if (err) | |
1211 | return err; | |
8a47a6c5 | 1212 | } |
8a47a6c5 WN |
1213 | } |
1214 | ||
1215 | zfree(&prog->reloc_desc); | |
1216 | prog->nr_reloc = 0; | |
1217 | return 0; | |
1218 | } | |
1219 | ||
1220 | ||
1221 | static int | |
1222 | bpf_object__relocate(struct bpf_object *obj) | |
1223 | { | |
1224 | struct bpf_program *prog; | |
1225 | size_t i; | |
1226 | int err; | |
1227 | ||
1228 | for (i = 0; i < obj->nr_programs; i++) { | |
1229 | prog = &obj->programs[i]; | |
1230 | ||
9d759a9b | 1231 | err = bpf_program__relocate(prog, obj); |
8a47a6c5 WN |
1232 | if (err) { |
1233 | pr_warning("failed to relocate '%s'\n", | |
1234 | prog->section_name); | |
1235 | return err; | |
1236 | } | |
1237 | } | |
1238 | return 0; | |
1239 | } | |
1240 | ||
34090915 WN |
1241 | static int bpf_object__collect_reloc(struct bpf_object *obj) |
1242 | { | |
1243 | int i, err; | |
1244 | ||
1245 | if (!obj_elf_valid(obj)) { | |
1246 | pr_warning("Internal error: elf object is closed\n"); | |
6371ca3b | 1247 | return -LIBBPF_ERRNO__INTERNAL; |
34090915 WN |
1248 | } |
1249 | ||
1250 | for (i = 0; i < obj->efile.nr_reloc; i++) { | |
1251 | GElf_Shdr *shdr = &obj->efile.reloc[i].shdr; | |
1252 | Elf_Data *data = obj->efile.reloc[i].data; | |
1253 | int idx = shdr->sh_info; | |
1254 | struct bpf_program *prog; | |
34090915 WN |
1255 | |
1256 | if (shdr->sh_type != SHT_REL) { | |
1257 | pr_warning("internal error at %d\n", __LINE__); | |
6371ca3b | 1258 | return -LIBBPF_ERRNO__INTERNAL; |
34090915 WN |
1259 | } |
1260 | ||
1261 | prog = bpf_object__find_prog_by_idx(obj, idx); | |
1262 | if (!prog) { | |
077c066a | 1263 | pr_warning("relocation failed: no section(%d)\n", idx); |
6371ca3b | 1264 | return -LIBBPF_ERRNO__RELOC; |
34090915 WN |
1265 | } |
1266 | ||
48cca7e4 | 1267 | err = bpf_program__collect_reloc(prog, |
34090915 | 1268 | shdr, data, |
48cca7e4 | 1269 | obj); |
34090915 | 1270 | if (err) |
6371ca3b | 1271 | return err; |
34090915 WN |
1272 | } |
1273 | return 0; | |
1274 | } | |
1275 | ||
55cffde2 | 1276 | static int |
d7be143b AI |
1277 | load_program(enum bpf_prog_type type, enum bpf_attach_type expected_attach_type, |
1278 | const char *name, struct bpf_insn *insns, int insns_cnt, | |
f0307a7e | 1279 | char *license, u32 kern_version, int *pfd, int prog_ifindex) |
55cffde2 | 1280 | { |
d7be143b | 1281 | struct bpf_load_program_attr load_attr; |
55cffde2 | 1282 | char *log_buf; |
d7be143b | 1283 | int ret; |
55cffde2 | 1284 | |
d7be143b AI |
1285 | memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); |
1286 | load_attr.prog_type = type; | |
1287 | load_attr.expected_attach_type = expected_attach_type; | |
1288 | load_attr.name = name; | |
1289 | load_attr.insns = insns; | |
1290 | load_attr.insns_cnt = insns_cnt; | |
1291 | load_attr.license = license; | |
1292 | load_attr.kern_version = kern_version; | |
f0307a7e | 1293 | load_attr.prog_ifindex = prog_ifindex; |
d7be143b AI |
1294 | |
1295 | if (!load_attr.insns || !load_attr.insns_cnt) | |
55cffde2 WN |
1296 | return -EINVAL; |
1297 | ||
1298 | log_buf = malloc(BPF_LOG_BUF_SIZE); | |
1299 | if (!log_buf) | |
1300 | pr_warning("Alloc log buffer for bpf loader error, continue without log\n"); | |
1301 | ||
d7be143b | 1302 | ret = bpf_load_program_xattr(&load_attr, log_buf, BPF_LOG_BUF_SIZE); |
55cffde2 WN |
1303 | |
1304 | if (ret >= 0) { | |
1305 | *pfd = ret; | |
1306 | ret = 0; | |
1307 | goto out; | |
1308 | } | |
1309 | ||
6371ca3b | 1310 | ret = -LIBBPF_ERRNO__LOAD; |
55cffde2 WN |
1311 | pr_warning("load bpf program failed: %s\n", strerror(errno)); |
1312 | ||
6371ca3b WN |
1313 | if (log_buf && log_buf[0] != '\0') { |
1314 | ret = -LIBBPF_ERRNO__VERIFY; | |
55cffde2 WN |
1315 | pr_warning("-- BEGIN DUMP LOG ---\n"); |
1316 | pr_warning("\n%s\n", log_buf); | |
1317 | pr_warning("-- END LOG --\n"); | |
d7be143b AI |
1318 | } else if (load_attr.insns_cnt >= BPF_MAXINSNS) { |
1319 | pr_warning("Program too large (%zu insns), at most %d insns\n", | |
1320 | load_attr.insns_cnt, BPF_MAXINSNS); | |
705fa219 | 1321 | ret = -LIBBPF_ERRNO__PROG2BIG; |
6371ca3b | 1322 | } else { |
705fa219 | 1323 | /* Wrong program type? */ |
d7be143b | 1324 | if (load_attr.prog_type != BPF_PROG_TYPE_KPROBE) { |
705fa219 WN |
1325 | int fd; |
1326 | ||
d7be143b AI |
1327 | load_attr.prog_type = BPF_PROG_TYPE_KPROBE; |
1328 | load_attr.expected_attach_type = 0; | |
1329 | fd = bpf_load_program_xattr(&load_attr, NULL, 0); | |
705fa219 WN |
1330 | if (fd >= 0) { |
1331 | close(fd); | |
1332 | ret = -LIBBPF_ERRNO__PROGTYPE; | |
1333 | goto out; | |
1334 | } | |
6371ca3b | 1335 | } |
705fa219 WN |
1336 | |
1337 | if (log_buf) | |
1338 | ret = -LIBBPF_ERRNO__KVER; | |
55cffde2 WN |
1339 | } |
1340 | ||
1341 | out: | |
1342 | free(log_buf); | |
1343 | return ret; | |
1344 | } | |
1345 | ||
1346 | static int | |
1347 | bpf_program__load(struct bpf_program *prog, | |
1348 | char *license, u32 kern_version) | |
1349 | { | |
b580563e | 1350 | int err = 0, fd, i; |
55cffde2 | 1351 | |
b580563e WN |
1352 | if (prog->instances.nr < 0 || !prog->instances.fds) { |
1353 | if (prog->preprocessor) { | |
1354 | pr_warning("Internal error: can't load program '%s'\n", | |
1355 | prog->section_name); | |
1356 | return -LIBBPF_ERRNO__INTERNAL; | |
1357 | } | |
55cffde2 | 1358 | |
b580563e WN |
1359 | prog->instances.fds = malloc(sizeof(int)); |
1360 | if (!prog->instances.fds) { | |
1361 | pr_warning("Not enough memory for BPF fds\n"); | |
1362 | return -ENOMEM; | |
1363 | } | |
1364 | prog->instances.nr = 1; | |
1365 | prog->instances.fds[0] = -1; | |
1366 | } | |
1367 | ||
1368 | if (!prog->preprocessor) { | |
1369 | if (prog->instances.nr != 1) { | |
1370 | pr_warning("Program '%s' is inconsistent: nr(%d) != 1\n", | |
1371 | prog->section_name, prog->instances.nr); | |
1372 | } | |
d7be143b AI |
1373 | err = load_program(prog->type, prog->expected_attach_type, |
1374 | prog->name, prog->insns, prog->insns_cnt, | |
f0307a7e DB |
1375 | license, kern_version, &fd, |
1376 | prog->prog_ifindex); | |
b580563e WN |
1377 | if (!err) |
1378 | prog->instances.fds[0] = fd; | |
1379 | goto out; | |
1380 | } | |
1381 | ||
1382 | for (i = 0; i < prog->instances.nr; i++) { | |
1383 | struct bpf_prog_prep_result result; | |
1384 | bpf_program_prep_t preprocessor = prog->preprocessor; | |
1385 | ||
1386 | bzero(&result, sizeof(result)); | |
1387 | err = preprocessor(prog, i, prog->insns, | |
1388 | prog->insns_cnt, &result); | |
1389 | if (err) { | |
1390 | pr_warning("Preprocessing the %dth instance of program '%s' failed\n", | |
1391 | i, prog->section_name); | |
1392 | goto out; | |
1393 | } | |
1394 | ||
1395 | if (!result.new_insn_ptr || !result.new_insn_cnt) { | |
1396 | pr_debug("Skip loading the %dth instance of program '%s'\n", | |
1397 | i, prog->section_name); | |
1398 | prog->instances.fds[i] = -1; | |
1399 | if (result.pfd) | |
1400 | *result.pfd = -1; | |
1401 | continue; | |
1402 | } | |
1403 | ||
d7be143b AI |
1404 | err = load_program(prog->type, prog->expected_attach_type, |
1405 | prog->name, result.new_insn_ptr, | |
b580563e | 1406 | result.new_insn_cnt, |
f0307a7e DB |
1407 | license, kern_version, &fd, |
1408 | prog->prog_ifindex); | |
b580563e WN |
1409 | |
1410 | if (err) { | |
1411 | pr_warning("Loading the %dth instance of program '%s' failed\n", | |
1412 | i, prog->section_name); | |
1413 | goto out; | |
1414 | } | |
1415 | ||
1416 | if (result.pfd) | |
1417 | *result.pfd = fd; | |
1418 | prog->instances.fds[i] = fd; | |
1419 | } | |
1420 | out: | |
55cffde2 WN |
1421 | if (err) |
1422 | pr_warning("failed to load program '%s'\n", | |
1423 | prog->section_name); | |
1424 | zfree(&prog->insns); | |
1425 | prog->insns_cnt = 0; | |
1426 | return err; | |
1427 | } | |
1428 | ||
1429 | static int | |
1430 | bpf_object__load_progs(struct bpf_object *obj) | |
1431 | { | |
1432 | size_t i; | |
1433 | int err; | |
1434 | ||
1435 | for (i = 0; i < obj->nr_programs; i++) { | |
48cca7e4 AS |
1436 | if (obj->programs[i].idx == obj->efile.text_shndx) |
1437 | continue; | |
55cffde2 WN |
1438 | err = bpf_program__load(&obj->programs[i], |
1439 | obj->license, | |
1440 | obj->kern_version); | |
1441 | if (err) | |
1442 | return err; | |
1443 | } | |
1444 | return 0; | |
1445 | } | |
1446 | ||
17387dd5 JK |
1447 | static bool bpf_prog_type__needs_kver(enum bpf_prog_type type) |
1448 | { | |
1449 | switch (type) { | |
1450 | case BPF_PROG_TYPE_SOCKET_FILTER: | |
1451 | case BPF_PROG_TYPE_SCHED_CLS: | |
1452 | case BPF_PROG_TYPE_SCHED_ACT: | |
1453 | case BPF_PROG_TYPE_XDP: | |
1454 | case BPF_PROG_TYPE_CGROUP_SKB: | |
1455 | case BPF_PROG_TYPE_CGROUP_SOCK: | |
1456 | case BPF_PROG_TYPE_LWT_IN: | |
1457 | case BPF_PROG_TYPE_LWT_OUT: | |
1458 | case BPF_PROG_TYPE_LWT_XMIT: | |
004d4b27 | 1459 | case BPF_PROG_TYPE_LWT_SEG6LOCAL: |
17387dd5 JK |
1460 | case BPF_PROG_TYPE_SOCK_OPS: |
1461 | case BPF_PROG_TYPE_SK_SKB: | |
1462 | case BPF_PROG_TYPE_CGROUP_DEVICE: | |
1463 | case BPF_PROG_TYPE_SK_MSG: | |
1464 | case BPF_PROG_TYPE_CGROUP_SOCK_ADDR: | |
6bdd533c | 1465 | case BPF_PROG_TYPE_LIRC_MODE2: |
17387dd5 JK |
1466 | return false; |
1467 | case BPF_PROG_TYPE_UNSPEC: | |
1468 | case BPF_PROG_TYPE_KPROBE: | |
1469 | case BPF_PROG_TYPE_TRACEPOINT: | |
1470 | case BPF_PROG_TYPE_PERF_EVENT: | |
1471 | case BPF_PROG_TYPE_RAW_TRACEPOINT: | |
1472 | default: | |
1473 | return true; | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | static int bpf_object__validate(struct bpf_object *obj, bool needs_kver) | |
cb1e5e96 | 1478 | { |
17387dd5 | 1479 | if (needs_kver && obj->kern_version == 0) { |
cb1e5e96 WN |
1480 | pr_warning("%s doesn't provide kernel version\n", |
1481 | obj->path); | |
6371ca3b | 1482 | return -LIBBPF_ERRNO__KVERSION; |
cb1e5e96 WN |
1483 | } |
1484 | return 0; | |
1485 | } | |
1486 | ||
1a5e3fb1 | 1487 | static struct bpf_object * |
17387dd5 JK |
1488 | __bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz, |
1489 | bool needs_kver) | |
1a5e3fb1 WN |
1490 | { |
1491 | struct bpf_object *obj; | |
6371ca3b | 1492 | int err; |
1a5e3fb1 WN |
1493 | |
1494 | if (elf_version(EV_CURRENT) == EV_NONE) { | |
1495 | pr_warning("failed to init libelf for %s\n", path); | |
6371ca3b | 1496 | return ERR_PTR(-LIBBPF_ERRNO__LIBELF); |
1a5e3fb1 WN |
1497 | } |
1498 | ||
6c956392 | 1499 | obj = bpf_object__new(path, obj_buf, obj_buf_sz); |
6371ca3b WN |
1500 | if (IS_ERR(obj)) |
1501 | return obj; | |
1a5e3fb1 | 1502 | |
6371ca3b WN |
1503 | CHECK_ERR(bpf_object__elf_init(obj), err, out); |
1504 | CHECK_ERR(bpf_object__check_endianness(obj), err, out); | |
1505 | CHECK_ERR(bpf_object__elf_collect(obj), err, out); | |
1506 | CHECK_ERR(bpf_object__collect_reloc(obj), err, out); | |
17387dd5 | 1507 | CHECK_ERR(bpf_object__validate(obj, needs_kver), err, out); |
1a5e3fb1 WN |
1508 | |
1509 | bpf_object__elf_finish(obj); | |
1510 | return obj; | |
1511 | out: | |
1512 | bpf_object__close(obj); | |
6371ca3b | 1513 | return ERR_PTR(err); |
1a5e3fb1 WN |
1514 | } |
1515 | ||
1516 | struct bpf_object *bpf_object__open(const char *path) | |
1517 | { | |
1518 | /* param validation */ | |
1519 | if (!path) | |
1520 | return NULL; | |
1521 | ||
1522 | pr_debug("loading %s\n", path); | |
1523 | ||
17387dd5 | 1524 | return __bpf_object__open(path, NULL, 0, true); |
6c956392 WN |
1525 | } |
1526 | ||
1527 | struct bpf_object *bpf_object__open_buffer(void *obj_buf, | |
acf860ae WN |
1528 | size_t obj_buf_sz, |
1529 | const char *name) | |
6c956392 | 1530 | { |
acf860ae WN |
1531 | char tmp_name[64]; |
1532 | ||
6c956392 WN |
1533 | /* param validation */ |
1534 | if (!obj_buf || obj_buf_sz <= 0) | |
1535 | return NULL; | |
1536 | ||
acf860ae WN |
1537 | if (!name) { |
1538 | snprintf(tmp_name, sizeof(tmp_name), "%lx-%lx", | |
1539 | (unsigned long)obj_buf, | |
1540 | (unsigned long)obj_buf_sz); | |
1541 | tmp_name[sizeof(tmp_name) - 1] = '\0'; | |
1542 | name = tmp_name; | |
1543 | } | |
1544 | pr_debug("loading object '%s' from buffer\n", | |
1545 | name); | |
6c956392 | 1546 | |
17387dd5 | 1547 | return __bpf_object__open(name, obj_buf, obj_buf_sz, true); |
1a5e3fb1 WN |
1548 | } |
1549 | ||
52d3352e WN |
1550 | int bpf_object__unload(struct bpf_object *obj) |
1551 | { | |
1552 | size_t i; | |
1553 | ||
1554 | if (!obj) | |
1555 | return -EINVAL; | |
1556 | ||
9d759a9b WN |
1557 | for (i = 0; i < obj->nr_maps; i++) |
1558 | zclose(obj->maps[i].fd); | |
52d3352e | 1559 | |
55cffde2 WN |
1560 | for (i = 0; i < obj->nr_programs; i++) |
1561 | bpf_program__unload(&obj->programs[i]); | |
1562 | ||
52d3352e WN |
1563 | return 0; |
1564 | } | |
1565 | ||
1566 | int bpf_object__load(struct bpf_object *obj) | |
1567 | { | |
6371ca3b WN |
1568 | int err; |
1569 | ||
52d3352e WN |
1570 | if (!obj) |
1571 | return -EINVAL; | |
1572 | ||
1573 | if (obj->loaded) { | |
1574 | pr_warning("object should not be loaded twice\n"); | |
1575 | return -EINVAL; | |
1576 | } | |
1577 | ||
1578 | obj->loaded = true; | |
6371ca3b WN |
1579 | |
1580 | CHECK_ERR(bpf_object__create_maps(obj), err, out); | |
1581 | CHECK_ERR(bpf_object__relocate(obj), err, out); | |
1582 | CHECK_ERR(bpf_object__load_progs(obj), err, out); | |
52d3352e WN |
1583 | |
1584 | return 0; | |
1585 | out: | |
1586 | bpf_object__unload(obj); | |
1587 | pr_warning("failed to load object '%s'\n", obj->path); | |
6371ca3b | 1588 | return err; |
52d3352e WN |
1589 | } |
1590 | ||
f367540c JS |
1591 | static int check_path(const char *path) |
1592 | { | |
1593 | struct statfs st_fs; | |
1594 | char *dname, *dir; | |
1595 | int err = 0; | |
1596 | ||
1597 | if (path == NULL) | |
1598 | return -EINVAL; | |
1599 | ||
1600 | dname = strdup(path); | |
1601 | if (dname == NULL) | |
1602 | return -ENOMEM; | |
1603 | ||
1604 | dir = dirname(dname); | |
1605 | if (statfs(dir, &st_fs)) { | |
1606 | pr_warning("failed to statfs %s: %s\n", dir, strerror(errno)); | |
1607 | err = -errno; | |
1608 | } | |
1609 | free(dname); | |
1610 | ||
1611 | if (!err && st_fs.f_type != BPF_FS_MAGIC) { | |
1612 | pr_warning("specified path %s is not on BPF FS\n", path); | |
1613 | err = -EINVAL; | |
1614 | } | |
1615 | ||
1616 | return err; | |
1617 | } | |
1618 | ||
1619 | int bpf_program__pin_instance(struct bpf_program *prog, const char *path, | |
1620 | int instance) | |
1621 | { | |
1622 | int err; | |
1623 | ||
1624 | err = check_path(path); | |
1625 | if (err) | |
1626 | return err; | |
1627 | ||
1628 | if (prog == NULL) { | |
1629 | pr_warning("invalid program pointer\n"); | |
1630 | return -EINVAL; | |
1631 | } | |
1632 | ||
1633 | if (instance < 0 || instance >= prog->instances.nr) { | |
1634 | pr_warning("invalid prog instance %d of prog %s (max %d)\n", | |
1635 | instance, prog->section_name, prog->instances.nr); | |
1636 | return -EINVAL; | |
1637 | } | |
1638 | ||
1639 | if (bpf_obj_pin(prog->instances.fds[instance], path)) { | |
1640 | pr_warning("failed to pin program: %s\n", strerror(errno)); | |
1641 | return -errno; | |
1642 | } | |
1643 | pr_debug("pinned program '%s'\n", path); | |
1644 | ||
1645 | return 0; | |
1646 | } | |
1647 | ||
1648 | static int make_dir(const char *path) | |
1649 | { | |
1650 | int err = 0; | |
1651 | ||
1652 | if (mkdir(path, 0700) && errno != EEXIST) | |
1653 | err = -errno; | |
1654 | ||
1655 | if (err) | |
1656 | pr_warning("failed to mkdir %s: %s\n", path, strerror(-err)); | |
1657 | return err; | |
1658 | } | |
1659 | ||
1660 | int bpf_program__pin(struct bpf_program *prog, const char *path) | |
1661 | { | |
1662 | int i, err; | |
1663 | ||
1664 | err = check_path(path); | |
1665 | if (err) | |
1666 | return err; | |
1667 | ||
1668 | if (prog == NULL) { | |
1669 | pr_warning("invalid program pointer\n"); | |
1670 | return -EINVAL; | |
1671 | } | |
1672 | ||
1673 | if (prog->instances.nr <= 0) { | |
1674 | pr_warning("no instances of prog %s to pin\n", | |
1675 | prog->section_name); | |
1676 | return -EINVAL; | |
1677 | } | |
1678 | ||
1679 | err = make_dir(path); | |
1680 | if (err) | |
1681 | return err; | |
1682 | ||
1683 | for (i = 0; i < prog->instances.nr; i++) { | |
1684 | char buf[PATH_MAX]; | |
1685 | int len; | |
1686 | ||
1687 | len = snprintf(buf, PATH_MAX, "%s/%d", path, i); | |
1688 | if (len < 0) | |
1689 | return -EINVAL; | |
1690 | else if (len >= PATH_MAX) | |
1691 | return -ENAMETOOLONG; | |
1692 | ||
1693 | err = bpf_program__pin_instance(prog, buf, i); | |
1694 | if (err) | |
1695 | return err; | |
1696 | } | |
1697 | ||
1698 | return 0; | |
1699 | } | |
1700 | ||
b6989f35 JS |
1701 | int bpf_map__pin(struct bpf_map *map, const char *path) |
1702 | { | |
1703 | int err; | |
1704 | ||
1705 | err = check_path(path); | |
1706 | if (err) | |
1707 | return err; | |
1708 | ||
1709 | if (map == NULL) { | |
1710 | pr_warning("invalid map pointer\n"); | |
1711 | return -EINVAL; | |
1712 | } | |
1713 | ||
1714 | if (bpf_obj_pin(map->fd, path)) { | |
1715 | pr_warning("failed to pin map: %s\n", strerror(errno)); | |
1716 | return -errno; | |
1717 | } | |
1718 | ||
1719 | pr_debug("pinned map '%s'\n", path); | |
1720 | return 0; | |
1721 | } | |
1722 | ||
d5148d85 JS |
1723 | int bpf_object__pin(struct bpf_object *obj, const char *path) |
1724 | { | |
1725 | struct bpf_program *prog; | |
1726 | struct bpf_map *map; | |
1727 | int err; | |
1728 | ||
1729 | if (!obj) | |
1730 | return -ENOENT; | |
1731 | ||
1732 | if (!obj->loaded) { | |
1733 | pr_warning("object not yet loaded; load it first\n"); | |
1734 | return -ENOENT; | |
1735 | } | |
1736 | ||
1737 | err = make_dir(path); | |
1738 | if (err) | |
1739 | return err; | |
1740 | ||
1741 | bpf_map__for_each(map, obj) { | |
1742 | char buf[PATH_MAX]; | |
1743 | int len; | |
1744 | ||
1745 | len = snprintf(buf, PATH_MAX, "%s/%s", path, | |
1746 | bpf_map__name(map)); | |
1747 | if (len < 0) | |
1748 | return -EINVAL; | |
1749 | else if (len >= PATH_MAX) | |
1750 | return -ENAMETOOLONG; | |
1751 | ||
1752 | err = bpf_map__pin(map, buf); | |
1753 | if (err) | |
1754 | return err; | |
1755 | } | |
1756 | ||
1757 | bpf_object__for_each_program(prog, obj) { | |
1758 | char buf[PATH_MAX]; | |
1759 | int len; | |
1760 | ||
1761 | len = snprintf(buf, PATH_MAX, "%s/%s", path, | |
1762 | prog->section_name); | |
1763 | if (len < 0) | |
1764 | return -EINVAL; | |
1765 | else if (len >= PATH_MAX) | |
1766 | return -ENAMETOOLONG; | |
1767 | ||
1768 | err = bpf_program__pin(prog, buf); | |
1769 | if (err) | |
1770 | return err; | |
1771 | } | |
1772 | ||
1773 | return 0; | |
1774 | } | |
1775 | ||
1a5e3fb1 WN |
1776 | void bpf_object__close(struct bpf_object *obj) |
1777 | { | |
a5b8bd47 WN |
1778 | size_t i; |
1779 | ||
1a5e3fb1 WN |
1780 | if (!obj) |
1781 | return; | |
1782 | ||
10931d24 WN |
1783 | if (obj->clear_priv) |
1784 | obj->clear_priv(obj, obj->priv); | |
1785 | ||
1a5e3fb1 | 1786 | bpf_object__elf_finish(obj); |
52d3352e | 1787 | bpf_object__unload(obj); |
8a138aed | 1788 | btf__free(obj->btf); |
1a5e3fb1 | 1789 | |
9d759a9b | 1790 | for (i = 0; i < obj->nr_maps; i++) { |
561bbcca | 1791 | zfree(&obj->maps[i].name); |
9d759a9b WN |
1792 | if (obj->maps[i].clear_priv) |
1793 | obj->maps[i].clear_priv(&obj->maps[i], | |
1794 | obj->maps[i].priv); | |
1795 | obj->maps[i].priv = NULL; | |
1796 | obj->maps[i].clear_priv = NULL; | |
1797 | } | |
1798 | zfree(&obj->maps); | |
1799 | obj->nr_maps = 0; | |
a5b8bd47 WN |
1800 | |
1801 | if (obj->programs && obj->nr_programs) { | |
1802 | for (i = 0; i < obj->nr_programs; i++) | |
1803 | bpf_program__exit(&obj->programs[i]); | |
1804 | } | |
1805 | zfree(&obj->programs); | |
1806 | ||
9a208eff | 1807 | list_del(&obj->list); |
1a5e3fb1 WN |
1808 | free(obj); |
1809 | } | |
aa9b1ac3 | 1810 | |
9a208eff WN |
1811 | struct bpf_object * |
1812 | bpf_object__next(struct bpf_object *prev) | |
1813 | { | |
1814 | struct bpf_object *next; | |
1815 | ||
1816 | if (!prev) | |
1817 | next = list_first_entry(&bpf_objects_list, | |
1818 | struct bpf_object, | |
1819 | list); | |
1820 | else | |
1821 | next = list_next_entry(prev, list); | |
1822 | ||
1823 | /* Empty list is noticed here so don't need checking on entry. */ | |
1824 | if (&next->list == &bpf_objects_list) | |
1825 | return NULL; | |
1826 | ||
1827 | return next; | |
1828 | } | |
1829 | ||
a7fe0450 | 1830 | const char *bpf_object__name(struct bpf_object *obj) |
acf860ae | 1831 | { |
a7fe0450 | 1832 | return obj ? obj->path : ERR_PTR(-EINVAL); |
acf860ae WN |
1833 | } |
1834 | ||
a7fe0450 | 1835 | unsigned int bpf_object__kversion(struct bpf_object *obj) |
45825d8a | 1836 | { |
a7fe0450 | 1837 | return obj ? obj->kern_version : 0; |
45825d8a WN |
1838 | } |
1839 | ||
8a138aed MKL |
1840 | int bpf_object__btf_fd(const struct bpf_object *obj) |
1841 | { | |
1842 | return obj->btf ? btf__fd(obj->btf) : -1; | |
1843 | } | |
1844 | ||
10931d24 WN |
1845 | int bpf_object__set_priv(struct bpf_object *obj, void *priv, |
1846 | bpf_object_clear_priv_t clear_priv) | |
1847 | { | |
1848 | if (obj->priv && obj->clear_priv) | |
1849 | obj->clear_priv(obj, obj->priv); | |
1850 | ||
1851 | obj->priv = priv; | |
1852 | obj->clear_priv = clear_priv; | |
1853 | return 0; | |
1854 | } | |
1855 | ||
1856 | void *bpf_object__priv(struct bpf_object *obj) | |
1857 | { | |
1858 | return obj ? obj->priv : ERR_PTR(-EINVAL); | |
1859 | } | |
1860 | ||
aa9b1ac3 WN |
1861 | struct bpf_program * |
1862 | bpf_program__next(struct bpf_program *prev, struct bpf_object *obj) | |
1863 | { | |
1864 | size_t idx; | |
1865 | ||
1866 | if (!obj->programs) | |
1867 | return NULL; | |
1868 | /* First handler */ | |
1869 | if (prev == NULL) | |
1870 | return &obj->programs[0]; | |
1871 | ||
1872 | if (prev->obj != obj) { | |
1873 | pr_warning("error: program handler doesn't match object\n"); | |
1874 | return NULL; | |
1875 | } | |
1876 | ||
1877 | idx = (prev - obj->programs) + 1; | |
1878 | if (idx >= obj->nr_programs) | |
1879 | return NULL; | |
1880 | return &obj->programs[idx]; | |
1881 | } | |
1882 | ||
edb13ed4 ACM |
1883 | int bpf_program__set_priv(struct bpf_program *prog, void *priv, |
1884 | bpf_program_clear_priv_t clear_priv) | |
aa9b1ac3 WN |
1885 | { |
1886 | if (prog->priv && prog->clear_priv) | |
1887 | prog->clear_priv(prog, prog->priv); | |
1888 | ||
1889 | prog->priv = priv; | |
1890 | prog->clear_priv = clear_priv; | |
1891 | return 0; | |
1892 | } | |
1893 | ||
be834ffb | 1894 | void *bpf_program__priv(struct bpf_program *prog) |
aa9b1ac3 | 1895 | { |
be834ffb | 1896 | return prog ? prog->priv : ERR_PTR(-EINVAL); |
aa9b1ac3 WN |
1897 | } |
1898 | ||
9aba3613 JK |
1899 | void bpf_program__set_ifindex(struct bpf_program *prog, __u32 ifindex) |
1900 | { | |
1901 | prog->prog_ifindex = ifindex; | |
1902 | } | |
1903 | ||
715f8db9 | 1904 | const char *bpf_program__title(struct bpf_program *prog, bool needs_copy) |
aa9b1ac3 WN |
1905 | { |
1906 | const char *title; | |
1907 | ||
1908 | title = prog->section_name; | |
715f8db9 | 1909 | if (needs_copy) { |
aa9b1ac3 WN |
1910 | title = strdup(title); |
1911 | if (!title) { | |
1912 | pr_warning("failed to strdup program title\n"); | |
6371ca3b | 1913 | return ERR_PTR(-ENOMEM); |
aa9b1ac3 WN |
1914 | } |
1915 | } | |
1916 | ||
1917 | return title; | |
1918 | } | |
1919 | ||
1920 | int bpf_program__fd(struct bpf_program *prog) | |
1921 | { | |
b580563e WN |
1922 | return bpf_program__nth_fd(prog, 0); |
1923 | } | |
1924 | ||
1925 | int bpf_program__set_prep(struct bpf_program *prog, int nr_instances, | |
1926 | bpf_program_prep_t prep) | |
1927 | { | |
1928 | int *instances_fds; | |
1929 | ||
1930 | if (nr_instances <= 0 || !prep) | |
1931 | return -EINVAL; | |
1932 | ||
1933 | if (prog->instances.nr > 0 || prog->instances.fds) { | |
1934 | pr_warning("Can't set pre-processor after loading\n"); | |
1935 | return -EINVAL; | |
1936 | } | |
1937 | ||
1938 | instances_fds = malloc(sizeof(int) * nr_instances); | |
1939 | if (!instances_fds) { | |
1940 | pr_warning("alloc memory failed for fds\n"); | |
1941 | return -ENOMEM; | |
1942 | } | |
1943 | ||
1944 | /* fill all fd with -1 */ | |
1945 | memset(instances_fds, -1, sizeof(int) * nr_instances); | |
1946 | ||
1947 | prog->instances.nr = nr_instances; | |
1948 | prog->instances.fds = instances_fds; | |
1949 | prog->preprocessor = prep; | |
1950 | return 0; | |
1951 | } | |
1952 | ||
1953 | int bpf_program__nth_fd(struct bpf_program *prog, int n) | |
1954 | { | |
1955 | int fd; | |
1956 | ||
1957 | if (n >= prog->instances.nr || n < 0) { | |
1958 | pr_warning("Can't get the %dth fd from program %s: only %d instances\n", | |
1959 | n, prog->section_name, prog->instances.nr); | |
1960 | return -EINVAL; | |
1961 | } | |
1962 | ||
1963 | fd = prog->instances.fds[n]; | |
1964 | if (fd < 0) { | |
1965 | pr_warning("%dth instance of program '%s' is invalid\n", | |
1966 | n, prog->section_name); | |
1967 | return -ENOENT; | |
1968 | } | |
1969 | ||
1970 | return fd; | |
aa9b1ac3 | 1971 | } |
9d759a9b | 1972 | |
dd26b7f5 | 1973 | void bpf_program__set_type(struct bpf_program *prog, enum bpf_prog_type type) |
5f44e4c8 WN |
1974 | { |
1975 | prog->type = type; | |
1976 | } | |
1977 | ||
5f44e4c8 WN |
1978 | static bool bpf_program__is_type(struct bpf_program *prog, |
1979 | enum bpf_prog_type type) | |
1980 | { | |
1981 | return prog ? (prog->type == type) : false; | |
1982 | } | |
1983 | ||
ed794073 JS |
1984 | #define BPF_PROG_TYPE_FNS(NAME, TYPE) \ |
1985 | int bpf_program__set_##NAME(struct bpf_program *prog) \ | |
1986 | { \ | |
1987 | if (!prog) \ | |
1988 | return -EINVAL; \ | |
1989 | bpf_program__set_type(prog, TYPE); \ | |
1990 | return 0; \ | |
1991 | } \ | |
1992 | \ | |
1993 | bool bpf_program__is_##NAME(struct bpf_program *prog) \ | |
1994 | { \ | |
1995 | return bpf_program__is_type(prog, TYPE); \ | |
1996 | } \ | |
1997 | ||
7803ba73 | 1998 | BPF_PROG_TYPE_FNS(socket_filter, BPF_PROG_TYPE_SOCKET_FILTER); |
ed794073 | 1999 | BPF_PROG_TYPE_FNS(kprobe, BPF_PROG_TYPE_KPROBE); |
7803ba73 JS |
2000 | BPF_PROG_TYPE_FNS(sched_cls, BPF_PROG_TYPE_SCHED_CLS); |
2001 | BPF_PROG_TYPE_FNS(sched_act, BPF_PROG_TYPE_SCHED_ACT); | |
ed794073 | 2002 | BPF_PROG_TYPE_FNS(tracepoint, BPF_PROG_TYPE_TRACEPOINT); |
e14c93fd | 2003 | BPF_PROG_TYPE_FNS(raw_tracepoint, BPF_PROG_TYPE_RAW_TRACEPOINT); |
7803ba73 JS |
2004 | BPF_PROG_TYPE_FNS(xdp, BPF_PROG_TYPE_XDP); |
2005 | BPF_PROG_TYPE_FNS(perf_event, BPF_PROG_TYPE_PERF_EVENT); | |
5f44e4c8 | 2006 | |
16962b24 JF |
2007 | void bpf_program__set_expected_attach_type(struct bpf_program *prog, |
2008 | enum bpf_attach_type type) | |
d7be143b AI |
2009 | { |
2010 | prog->expected_attach_type = type; | |
2011 | } | |
2012 | ||
2013 | #define BPF_PROG_SEC_FULL(string, ptype, atype) \ | |
2014 | { string, sizeof(string) - 1, ptype, atype } | |
2015 | ||
2016 | #define BPF_PROG_SEC(string, ptype) BPF_PROG_SEC_FULL(string, ptype, 0) | |
2017 | ||
81efee75 AI |
2018 | #define BPF_S_PROG_SEC(string, ptype) \ |
2019 | BPF_PROG_SEC_FULL(string, BPF_PROG_TYPE_CGROUP_SOCK, ptype) | |
2020 | ||
e50b0a6f AI |
2021 | #define BPF_SA_PROG_SEC(string, ptype) \ |
2022 | BPF_PROG_SEC_FULL(string, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, ptype) | |
2023 | ||
583c9009 RG |
2024 | static const struct { |
2025 | const char *sec; | |
2026 | size_t len; | |
2027 | enum bpf_prog_type prog_type; | |
d7be143b | 2028 | enum bpf_attach_type expected_attach_type; |
583c9009 RG |
2029 | } section_names[] = { |
2030 | BPF_PROG_SEC("socket", BPF_PROG_TYPE_SOCKET_FILTER), | |
2031 | BPF_PROG_SEC("kprobe/", BPF_PROG_TYPE_KPROBE), | |
2032 | BPF_PROG_SEC("kretprobe/", BPF_PROG_TYPE_KPROBE), | |
0badd331 QM |
2033 | BPF_PROG_SEC("classifier", BPF_PROG_TYPE_SCHED_CLS), |
2034 | BPF_PROG_SEC("action", BPF_PROG_TYPE_SCHED_ACT), | |
583c9009 | 2035 | BPF_PROG_SEC("tracepoint/", BPF_PROG_TYPE_TRACEPOINT), |
e14c93fd | 2036 | BPF_PROG_SEC("raw_tracepoint/", BPF_PROG_TYPE_RAW_TRACEPOINT), |
583c9009 RG |
2037 | BPF_PROG_SEC("xdp", BPF_PROG_TYPE_XDP), |
2038 | BPF_PROG_SEC("perf_event", BPF_PROG_TYPE_PERF_EVENT), | |
2039 | BPF_PROG_SEC("cgroup/skb", BPF_PROG_TYPE_CGROUP_SKB), | |
2040 | BPF_PROG_SEC("cgroup/sock", BPF_PROG_TYPE_CGROUP_SOCK), | |
2041 | BPF_PROG_SEC("cgroup/dev", BPF_PROG_TYPE_CGROUP_DEVICE), | |
0badd331 QM |
2042 | BPF_PROG_SEC("lwt_in", BPF_PROG_TYPE_LWT_IN), |
2043 | BPF_PROG_SEC("lwt_out", BPF_PROG_TYPE_LWT_OUT), | |
2044 | BPF_PROG_SEC("lwt_xmit", BPF_PROG_TYPE_LWT_XMIT), | |
d9b683d7 | 2045 | BPF_PROG_SEC("lwt_seg6local", BPF_PROG_TYPE_LWT_SEG6LOCAL), |
583c9009 RG |
2046 | BPF_PROG_SEC("sockops", BPF_PROG_TYPE_SOCK_OPS), |
2047 | BPF_PROG_SEC("sk_skb", BPF_PROG_TYPE_SK_SKB), | |
4c4c3c27 | 2048 | BPF_PROG_SEC("sk_msg", BPF_PROG_TYPE_SK_MSG), |
d9b683d7 | 2049 | BPF_PROG_SEC("lirc_mode2", BPF_PROG_TYPE_LIRC_MODE2), |
e50b0a6f AI |
2050 | BPF_SA_PROG_SEC("cgroup/bind4", BPF_CGROUP_INET4_BIND), |
2051 | BPF_SA_PROG_SEC("cgroup/bind6", BPF_CGROUP_INET6_BIND), | |
622adafb AI |
2052 | BPF_SA_PROG_SEC("cgroup/connect4", BPF_CGROUP_INET4_CONNECT), |
2053 | BPF_SA_PROG_SEC("cgroup/connect6", BPF_CGROUP_INET6_CONNECT), | |
72481f39 AI |
2054 | BPF_SA_PROG_SEC("cgroup/sendmsg4", BPF_CGROUP_UDP4_SENDMSG), |
2055 | BPF_SA_PROG_SEC("cgroup/sendmsg6", BPF_CGROUP_UDP6_SENDMSG), | |
81efee75 AI |
2056 | BPF_S_PROG_SEC("cgroup/post_bind4", BPF_CGROUP_INET4_POST_BIND), |
2057 | BPF_S_PROG_SEC("cgroup/post_bind6", BPF_CGROUP_INET6_POST_BIND), | |
583c9009 | 2058 | }; |
d7be143b | 2059 | |
583c9009 | 2060 | #undef BPF_PROG_SEC |
d7be143b | 2061 | #undef BPF_PROG_SEC_FULL |
81efee75 | 2062 | #undef BPF_S_PROG_SEC |
e50b0a6f | 2063 | #undef BPF_SA_PROG_SEC |
583c9009 | 2064 | |
d7be143b | 2065 | static int bpf_program__identify_section(struct bpf_program *prog) |
583c9009 RG |
2066 | { |
2067 | int i; | |
2068 | ||
2069 | if (!prog->section_name) | |
2070 | goto err; | |
2071 | ||
2072 | for (i = 0; i < ARRAY_SIZE(section_names); i++) | |
2073 | if (strncmp(prog->section_name, section_names[i].sec, | |
2074 | section_names[i].len) == 0) | |
d7be143b | 2075 | return i; |
583c9009 RG |
2076 | |
2077 | err: | |
2078 | pr_warning("failed to guess program type based on section name %s\n", | |
2079 | prog->section_name); | |
2080 | ||
d7be143b | 2081 | return -1; |
583c9009 RG |
2082 | } |
2083 | ||
6e009e65 | 2084 | int bpf_map__fd(struct bpf_map *map) |
9d759a9b | 2085 | { |
6e009e65 | 2086 | return map ? map->fd : -EINVAL; |
9d759a9b WN |
2087 | } |
2088 | ||
53897a78 | 2089 | const struct bpf_map_def *bpf_map__def(struct bpf_map *map) |
9d759a9b | 2090 | { |
53897a78 | 2091 | return map ? &map->def : ERR_PTR(-EINVAL); |
9d759a9b WN |
2092 | } |
2093 | ||
009ad5d5 | 2094 | const char *bpf_map__name(struct bpf_map *map) |
561bbcca | 2095 | { |
009ad5d5 | 2096 | return map ? map->name : NULL; |
561bbcca WN |
2097 | } |
2098 | ||
61746dbe | 2099 | uint32_t bpf_map__btf_key_type_id(const struct bpf_map *map) |
8a138aed | 2100 | { |
61746dbe | 2101 | return map ? map->btf_key_type_id : 0; |
8a138aed MKL |
2102 | } |
2103 | ||
61746dbe | 2104 | uint32_t bpf_map__btf_value_type_id(const struct bpf_map *map) |
8a138aed | 2105 | { |
61746dbe | 2106 | return map ? map->btf_value_type_id : 0; |
8a138aed MKL |
2107 | } |
2108 | ||
edb13ed4 ACM |
2109 | int bpf_map__set_priv(struct bpf_map *map, void *priv, |
2110 | bpf_map_clear_priv_t clear_priv) | |
9d759a9b WN |
2111 | { |
2112 | if (!map) | |
2113 | return -EINVAL; | |
2114 | ||
2115 | if (map->priv) { | |
2116 | if (map->clear_priv) | |
2117 | map->clear_priv(map, map->priv); | |
2118 | } | |
2119 | ||
2120 | map->priv = priv; | |
2121 | map->clear_priv = clear_priv; | |
2122 | return 0; | |
2123 | } | |
2124 | ||
b4cbfa56 | 2125 | void *bpf_map__priv(struct bpf_map *map) |
9d759a9b | 2126 | { |
b4cbfa56 | 2127 | return map ? map->priv : ERR_PTR(-EINVAL); |
9d759a9b WN |
2128 | } |
2129 | ||
9aba3613 JK |
2130 | void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex) |
2131 | { | |
2132 | map->map_ifindex = ifindex; | |
2133 | } | |
2134 | ||
9d759a9b WN |
2135 | struct bpf_map * |
2136 | bpf_map__next(struct bpf_map *prev, struct bpf_object *obj) | |
2137 | { | |
2138 | size_t idx; | |
2139 | struct bpf_map *s, *e; | |
2140 | ||
2141 | if (!obj || !obj->maps) | |
2142 | return NULL; | |
2143 | ||
2144 | s = obj->maps; | |
2145 | e = obj->maps + obj->nr_maps; | |
2146 | ||
2147 | if (prev == NULL) | |
2148 | return s; | |
2149 | ||
2150 | if ((prev < s) || (prev >= e)) { | |
2151 | pr_warning("error in %s: map handler doesn't belong to object\n", | |
2152 | __func__); | |
2153 | return NULL; | |
2154 | } | |
2155 | ||
2156 | idx = (prev - obj->maps) + 1; | |
2157 | if (idx >= obj->nr_maps) | |
2158 | return NULL; | |
2159 | return &obj->maps[idx]; | |
2160 | } | |
561bbcca WN |
2161 | |
2162 | struct bpf_map * | |
a7fe0450 | 2163 | bpf_object__find_map_by_name(struct bpf_object *obj, const char *name) |
561bbcca WN |
2164 | { |
2165 | struct bpf_map *pos; | |
2166 | ||
2167 | bpf_map__for_each(pos, obj) { | |
973170e6 | 2168 | if (pos->name && !strcmp(pos->name, name)) |
561bbcca WN |
2169 | return pos; |
2170 | } | |
2171 | return NULL; | |
2172 | } | |
5a6acad1 WN |
2173 | |
2174 | struct bpf_map * | |
2175 | bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset) | |
2176 | { | |
2177 | int i; | |
2178 | ||
2179 | for (i = 0; i < obj->nr_maps; i++) { | |
2180 | if (obj->maps[i].offset == offset) | |
2181 | return &obj->maps[i]; | |
2182 | } | |
2183 | return ERR_PTR(-ENOENT); | |
2184 | } | |
e28ff1a8 JS |
2185 | |
2186 | long libbpf_get_error(const void *ptr) | |
2187 | { | |
2188 | if (IS_ERR(ptr)) | |
2189 | return PTR_ERR(ptr); | |
2190 | return 0; | |
2191 | } | |
6f6d33f3 JF |
2192 | |
2193 | int bpf_prog_load(const char *file, enum bpf_prog_type type, | |
2194 | struct bpf_object **pobj, int *prog_fd) | |
d7be143b AI |
2195 | { |
2196 | struct bpf_prog_load_attr attr; | |
2197 | ||
2198 | memset(&attr, 0, sizeof(struct bpf_prog_load_attr)); | |
2199 | attr.file = file; | |
2200 | attr.prog_type = type; | |
2201 | attr.expected_attach_type = 0; | |
2202 | ||
2203 | return bpf_prog_load_xattr(&attr, pobj, prog_fd); | |
2204 | } | |
2205 | ||
2206 | int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr, | |
2207 | struct bpf_object **pobj, int *prog_fd) | |
6f6d33f3 | 2208 | { |
48cca7e4 | 2209 | struct bpf_program *prog, *first_prog = NULL; |
d7be143b AI |
2210 | enum bpf_attach_type expected_attach_type; |
2211 | enum bpf_prog_type prog_type; | |
6f6d33f3 | 2212 | struct bpf_object *obj; |
f0307a7e | 2213 | struct bpf_map *map; |
d7be143b | 2214 | int section_idx; |
6f6d33f3 JF |
2215 | int err; |
2216 | ||
d7be143b AI |
2217 | if (!attr) |
2218 | return -EINVAL; | |
17387dd5 JK |
2219 | if (!attr->file) |
2220 | return -EINVAL; | |
d7be143b | 2221 | |
17387dd5 JK |
2222 | obj = __bpf_object__open(attr->file, NULL, 0, |
2223 | bpf_prog_type__needs_kver(attr->prog_type)); | |
3597683c | 2224 | if (IS_ERR_OR_NULL(obj)) |
6f6d33f3 JF |
2225 | return -ENOENT; |
2226 | ||
48cca7e4 AS |
2227 | bpf_object__for_each_program(prog, obj) { |
2228 | /* | |
2229 | * If type is not specified, try to guess it based on | |
2230 | * section name. | |
2231 | */ | |
d7be143b | 2232 | prog_type = attr->prog_type; |
f0307a7e | 2233 | prog->prog_ifindex = attr->ifindex; |
d7be143b AI |
2234 | expected_attach_type = attr->expected_attach_type; |
2235 | if (prog_type == BPF_PROG_TYPE_UNSPEC) { | |
2236 | section_idx = bpf_program__identify_section(prog); | |
2237 | if (section_idx < 0) { | |
48cca7e4 AS |
2238 | bpf_object__close(obj); |
2239 | return -EINVAL; | |
2240 | } | |
d7be143b AI |
2241 | prog_type = section_names[section_idx].prog_type; |
2242 | expected_attach_type = | |
2243 | section_names[section_idx].expected_attach_type; | |
583c9009 | 2244 | } |
48cca7e4 | 2245 | |
d7be143b AI |
2246 | bpf_program__set_type(prog, prog_type); |
2247 | bpf_program__set_expected_attach_type(prog, | |
2248 | expected_attach_type); | |
2249 | ||
48cca7e4 AS |
2250 | if (prog->idx != obj->efile.text_shndx && !first_prog) |
2251 | first_prog = prog; | |
2252 | } | |
2253 | ||
f0307a7e DB |
2254 | bpf_map__for_each(map, obj) { |
2255 | map->map_ifindex = attr->ifindex; | |
2256 | } | |
2257 | ||
48cca7e4 AS |
2258 | if (!first_prog) { |
2259 | pr_warning("object file doesn't contain bpf program\n"); | |
2260 | bpf_object__close(obj); | |
2261 | return -ENOENT; | |
583c9009 RG |
2262 | } |
2263 | ||
6f6d33f3 JF |
2264 | err = bpf_object__load(obj); |
2265 | if (err) { | |
2266 | bpf_object__close(obj); | |
2267 | return -EINVAL; | |
2268 | } | |
2269 | ||
2270 | *pobj = obj; | |
48cca7e4 | 2271 | *prog_fd = bpf_program__fd(first_prog); |
6f6d33f3 JF |
2272 | return 0; |
2273 | } | |
d0cabbb0 JK |
2274 | |
2275 | enum bpf_perf_event_ret | |
2276 | bpf_perf_event_read_simple(void *mem, unsigned long size, | |
2277 | unsigned long page_size, void **buf, size_t *buf_len, | |
2278 | bpf_perf_event_print_t fn, void *priv) | |
2279 | { | |
2280 | volatile struct perf_event_mmap_page *header = mem; | |
2281 | __u64 data_tail = header->data_tail; | |
2282 | __u64 data_head = header->data_head; | |
2283 | void *base, *begin, *end; | |
2284 | int ret; | |
2285 | ||
2286 | asm volatile("" ::: "memory"); /* in real code it should be smp_rmb() */ | |
2287 | if (data_head == data_tail) | |
2288 | return LIBBPF_PERF_EVENT_CONT; | |
2289 | ||
2290 | base = ((char *)header) + page_size; | |
2291 | ||
2292 | begin = base + data_tail % size; | |
2293 | end = base + data_head % size; | |
2294 | ||
2295 | while (begin != end) { | |
2296 | struct perf_event_header *ehdr; | |
2297 | ||
2298 | ehdr = begin; | |
2299 | if (begin + ehdr->size > base + size) { | |
2300 | long len = base + size - begin; | |
2301 | ||
2302 | if (*buf_len < ehdr->size) { | |
2303 | free(*buf); | |
2304 | *buf = malloc(ehdr->size); | |
2305 | if (!*buf) { | |
2306 | ret = LIBBPF_PERF_EVENT_ERROR; | |
2307 | break; | |
2308 | } | |
2309 | *buf_len = ehdr->size; | |
2310 | } | |
2311 | ||
2312 | memcpy(*buf, begin, len); | |
2313 | memcpy(*buf + len, base, ehdr->size - len); | |
2314 | ehdr = (void *)*buf; | |
2315 | begin = base + ehdr->size - len; | |
2316 | } else if (begin + ehdr->size == base + size) { | |
2317 | begin = base; | |
2318 | } else { | |
2319 | begin += ehdr->size; | |
2320 | } | |
2321 | ||
2322 | ret = fn(ehdr, priv); | |
2323 | if (ret != LIBBPF_PERF_EVENT_CONT) | |
2324 | break; | |
2325 | ||
2326 | data_tail += ehdr->size; | |
2327 | } | |
2328 | ||
2329 | __sync_synchronize(); /* smp_mb() */ | |
2330 | header->data_tail = data_tail; | |
2331 | ||
2332 | return ret; | |
2333 | } |