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 | ||
531b014e | 25 | #define _GNU_SOURCE |
1b76c13e | 26 | #include <stdlib.h> |
b3f59d66 WN |
27 | #include <stdio.h> |
28 | #include <stdarg.h> | |
f367540c | 29 | #include <libgen.h> |
34090915 | 30 | #include <inttypes.h> |
b3f59d66 | 31 | #include <string.h> |
1b76c13e | 32 | #include <unistd.h> |
1a5e3fb1 WN |
33 | #include <fcntl.h> |
34 | #include <errno.h> | |
d0cabbb0 | 35 | #include <perf-sys.h> |
1b76c13e | 36 | #include <asm/unistd.h> |
e28ff1a8 | 37 | #include <linux/err.h> |
cb1e5e96 | 38 | #include <linux/kernel.h> |
1b76c13e | 39 | #include <linux/bpf.h> |
9a208eff | 40 | #include <linux/list.h> |
f367540c JS |
41 | #include <linux/limits.h> |
42 | #include <sys/stat.h> | |
43 | #include <sys/types.h> | |
44 | #include <sys/vfs.h> | |
531b014e | 45 | #include <tools/libc_compat.h> |
1a5e3fb1 WN |
46 | #include <libelf.h> |
47 | #include <gelf.h> | |
1b76c13e WN |
48 | |
49 | #include "libbpf.h" | |
52d3352e | 50 | #include "bpf.h" |
8a138aed | 51 | #include "btf.h" |
b3f59d66 | 52 | |
9b16137a WN |
53 | #ifndef EM_BPF |
54 | #define EM_BPF 247 | |
55 | #endif | |
56 | ||
f367540c JS |
57 | #ifndef BPF_FS_MAGIC |
58 | #define BPF_FS_MAGIC 0xcafe4a11 | |
59 | #endif | |
60 | ||
b3f59d66 WN |
61 | #define __printf(a, b) __attribute__((format(printf, a, b))) |
62 | ||
63 | __printf(1, 2) | |
64 | static int __base_pr(const char *format, ...) | |
65 | { | |
66 | va_list args; | |
67 | int err; | |
68 | ||
69 | va_start(args, format); | |
70 | err = vfprintf(stderr, format, args); | |
71 | va_end(args); | |
72 | return err; | |
73 | } | |
74 | ||
75 | static __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr; | |
76 | static __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr; | |
77 | static __printf(1, 2) libbpf_print_fn_t __pr_debug; | |
78 | ||
79 | #define __pr(func, fmt, ...) \ | |
80 | do { \ | |
81 | if ((func)) \ | |
82 | (func)("libbpf: " fmt, ##__VA_ARGS__); \ | |
83 | } while (0) | |
84 | ||
85 | #define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__) | |
86 | #define pr_info(fmt, ...) __pr(__pr_info, fmt, ##__VA_ARGS__) | |
87 | #define pr_debug(fmt, ...) __pr(__pr_debug, fmt, ##__VA_ARGS__) | |
88 | ||
89 | void libbpf_set_print(libbpf_print_fn_t warn, | |
90 | libbpf_print_fn_t info, | |
91 | libbpf_print_fn_t debug) | |
92 | { | |
93 | __pr_warning = warn; | |
94 | __pr_info = info; | |
95 | __pr_debug = debug; | |
96 | } | |
1a5e3fb1 | 97 | |
6371ca3b WN |
98 | #define STRERR_BUFSIZE 128 |
99 | ||
6371ca3b WN |
100 | #define CHECK_ERR(action, err, out) do { \ |
101 | err = action; \ | |
102 | if (err) \ | |
103 | goto out; \ | |
104 | } while(0) | |
105 | ||
106 | ||
1a5e3fb1 WN |
107 | /* Copied from tools/perf/util/util.h */ |
108 | #ifndef zfree | |
109 | # define zfree(ptr) ({ free(*ptr); *ptr = NULL; }) | |
110 | #endif | |
111 | ||
112 | #ifndef zclose | |
113 | # define zclose(fd) ({ \ | |
114 | int ___err = 0; \ | |
115 | if ((fd) >= 0) \ | |
116 | ___err = close((fd)); \ | |
117 | fd = -1; \ | |
118 | ___err; }) | |
119 | #endif | |
120 | ||
121 | #ifdef HAVE_LIBELF_MMAP_SUPPORT | |
122 | # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ_MMAP | |
123 | #else | |
124 | # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ | |
125 | #endif | |
126 | ||
a5b8bd47 WN |
127 | /* |
128 | * bpf_prog should be a better name but it has been used in | |
129 | * linux/filter.h. | |
130 | */ | |
131 | struct bpf_program { | |
132 | /* Index in elf obj file, for relocation use. */ | |
133 | int idx; | |
88cda1c9 | 134 | char *name; |
f0307a7e | 135 | int prog_ifindex; |
a5b8bd47 WN |
136 | char *section_name; |
137 | struct bpf_insn *insns; | |
48cca7e4 | 138 | size_t insns_cnt, main_prog_cnt; |
5f44e4c8 | 139 | enum bpf_prog_type type; |
34090915 | 140 | |
48cca7e4 AS |
141 | struct reloc_desc { |
142 | enum { | |
143 | RELO_LD64, | |
144 | RELO_CALL, | |
145 | } type; | |
34090915 | 146 | int insn_idx; |
48cca7e4 AS |
147 | union { |
148 | int map_idx; | |
149 | int text_off; | |
150 | }; | |
34090915 WN |
151 | } *reloc_desc; |
152 | int nr_reloc; | |
55cffde2 | 153 | |
b580563e WN |
154 | struct { |
155 | int nr; | |
156 | int *fds; | |
157 | } instances; | |
158 | bpf_program_prep_t preprocessor; | |
aa9b1ac3 WN |
159 | |
160 | struct bpf_object *obj; | |
161 | void *priv; | |
162 | bpf_program_clear_priv_t clear_priv; | |
d7be143b AI |
163 | |
164 | enum bpf_attach_type expected_attach_type; | |
a5b8bd47 WN |
165 | }; |
166 | ||
9d759a9b WN |
167 | struct bpf_map { |
168 | int fd; | |
561bbcca | 169 | char *name; |
4708bbda | 170 | size_t offset; |
f0307a7e | 171 | int map_ifindex; |
9d759a9b | 172 | struct bpf_map_def def; |
61746dbe MKL |
173 | uint32_t btf_key_type_id; |
174 | uint32_t btf_value_type_id; | |
9d759a9b WN |
175 | void *priv; |
176 | bpf_map_clear_priv_t clear_priv; | |
177 | }; | |
178 | ||
9a208eff WN |
179 | static LIST_HEAD(bpf_objects_list); |
180 | ||
1a5e3fb1 | 181 | struct bpf_object { |
cb1e5e96 WN |
182 | char license[64]; |
183 | u32 kern_version; | |
0b3d1efa | 184 | |
a5b8bd47 WN |
185 | struct bpf_program *programs; |
186 | size_t nr_programs; | |
9d759a9b WN |
187 | struct bpf_map *maps; |
188 | size_t nr_maps; | |
189 | ||
52d3352e | 190 | bool loaded; |
9a94f277 | 191 | bool has_pseudo_calls; |
a5b8bd47 | 192 | |
1a5e3fb1 WN |
193 | /* |
194 | * Information when doing elf related work. Only valid if fd | |
195 | * is valid. | |
196 | */ | |
197 | struct { | |
198 | int fd; | |
6c956392 WN |
199 | void *obj_buf; |
200 | size_t obj_buf_sz; | |
1a5e3fb1 WN |
201 | Elf *elf; |
202 | GElf_Ehdr ehdr; | |
bec7d68c | 203 | Elf_Data *symbols; |
77ba9a5b | 204 | size_t strtabidx; |
b62f06e8 WN |
205 | struct { |
206 | GElf_Shdr shdr; | |
207 | Elf_Data *data; | |
208 | } *reloc; | |
209 | int nr_reloc; | |
666810e8 | 210 | int maps_shndx; |
48cca7e4 | 211 | int text_shndx; |
1a5e3fb1 | 212 | } efile; |
9a208eff WN |
213 | /* |
214 | * All loaded bpf_object is linked in a list, which is | |
215 | * hidden to caller. bpf_objects__<func> handlers deal with | |
216 | * all objects. | |
217 | */ | |
218 | struct list_head list; | |
10931d24 | 219 | |
8a138aed MKL |
220 | struct btf *btf; |
221 | ||
10931d24 WN |
222 | void *priv; |
223 | bpf_object_clear_priv_t clear_priv; | |
224 | ||
1a5e3fb1 WN |
225 | char path[]; |
226 | }; | |
227 | #define obj_elf_valid(o) ((o)->efile.elf) | |
228 | ||
55cffde2 WN |
229 | static void bpf_program__unload(struct bpf_program *prog) |
230 | { | |
b580563e WN |
231 | int i; |
232 | ||
55cffde2 WN |
233 | if (!prog) |
234 | return; | |
235 | ||
b580563e WN |
236 | /* |
237 | * If the object is opened but the program was never loaded, | |
238 | * it is possible that prog->instances.nr == -1. | |
239 | */ | |
240 | if (prog->instances.nr > 0) { | |
241 | for (i = 0; i < prog->instances.nr; i++) | |
242 | zclose(prog->instances.fds[i]); | |
243 | } else if (prog->instances.nr != -1) { | |
244 | pr_warning("Internal error: instances.nr is %d\n", | |
245 | prog->instances.nr); | |
246 | } | |
247 | ||
248 | prog->instances.nr = -1; | |
249 | zfree(&prog->instances.fds); | |
55cffde2 WN |
250 | } |
251 | ||
a5b8bd47 WN |
252 | static void bpf_program__exit(struct bpf_program *prog) |
253 | { | |
254 | if (!prog) | |
255 | return; | |
256 | ||
aa9b1ac3 WN |
257 | if (prog->clear_priv) |
258 | prog->clear_priv(prog, prog->priv); | |
259 | ||
260 | prog->priv = NULL; | |
261 | prog->clear_priv = NULL; | |
262 | ||
55cffde2 | 263 | bpf_program__unload(prog); |
88cda1c9 | 264 | zfree(&prog->name); |
a5b8bd47 WN |
265 | zfree(&prog->section_name); |
266 | zfree(&prog->insns); | |
34090915 WN |
267 | zfree(&prog->reloc_desc); |
268 | ||
269 | prog->nr_reloc = 0; | |
a5b8bd47 WN |
270 | prog->insns_cnt = 0; |
271 | prog->idx = -1; | |
272 | } | |
273 | ||
274 | static int | |
88cda1c9 MKL |
275 | bpf_program__init(void *data, size_t size, char *section_name, int idx, |
276 | struct bpf_program *prog) | |
a5b8bd47 WN |
277 | { |
278 | if (size < sizeof(struct bpf_insn)) { | |
88cda1c9 | 279 | pr_warning("corrupted section '%s'\n", section_name); |
a5b8bd47 WN |
280 | return -EINVAL; |
281 | } | |
282 | ||
283 | bzero(prog, sizeof(*prog)); | |
284 | ||
88cda1c9 | 285 | prog->section_name = strdup(section_name); |
a5b8bd47 | 286 | if (!prog->section_name) { |
077c066a JDB |
287 | pr_warning("failed to alloc name for prog under section(%d) %s\n", |
288 | idx, section_name); | |
a5b8bd47 WN |
289 | goto errout; |
290 | } | |
291 | ||
292 | prog->insns = malloc(size); | |
293 | if (!prog->insns) { | |
88cda1c9 MKL |
294 | pr_warning("failed to alloc insns for prog under section %s\n", |
295 | section_name); | |
a5b8bd47 WN |
296 | goto errout; |
297 | } | |
298 | prog->insns_cnt = size / sizeof(struct bpf_insn); | |
299 | memcpy(prog->insns, data, | |
300 | prog->insns_cnt * sizeof(struct bpf_insn)); | |
301 | prog->idx = idx; | |
b580563e WN |
302 | prog->instances.fds = NULL; |
303 | prog->instances.nr = -1; | |
5f44e4c8 | 304 | prog->type = BPF_PROG_TYPE_KPROBE; |
a5b8bd47 WN |
305 | |
306 | return 0; | |
307 | errout: | |
308 | bpf_program__exit(prog); | |
309 | return -ENOMEM; | |
310 | } | |
311 | ||
312 | static int | |
313 | bpf_object__add_program(struct bpf_object *obj, void *data, size_t size, | |
88cda1c9 | 314 | char *section_name, int idx) |
a5b8bd47 WN |
315 | { |
316 | struct bpf_program prog, *progs; | |
317 | int nr_progs, err; | |
318 | ||
88cda1c9 | 319 | err = bpf_program__init(data, size, section_name, idx, &prog); |
a5b8bd47 WN |
320 | if (err) |
321 | return err; | |
322 | ||
323 | progs = obj->programs; | |
324 | nr_progs = obj->nr_programs; | |
325 | ||
531b014e | 326 | progs = reallocarray(progs, nr_progs + 1, sizeof(progs[0])); |
a5b8bd47 WN |
327 | if (!progs) { |
328 | /* | |
329 | * In this case the original obj->programs | |
330 | * is still valid, so don't need special treat for | |
331 | * bpf_close_object(). | |
332 | */ | |
88cda1c9 MKL |
333 | pr_warning("failed to alloc a new program under section '%s'\n", |
334 | section_name); | |
a5b8bd47 WN |
335 | bpf_program__exit(&prog); |
336 | return -ENOMEM; | |
337 | } | |
338 | ||
339 | pr_debug("found program %s\n", prog.section_name); | |
340 | obj->programs = progs; | |
341 | obj->nr_programs = nr_progs + 1; | |
aa9b1ac3 | 342 | prog.obj = obj; |
a5b8bd47 WN |
343 | progs[nr_progs] = prog; |
344 | return 0; | |
345 | } | |
346 | ||
88cda1c9 MKL |
347 | static int |
348 | bpf_object__init_prog_names(struct bpf_object *obj) | |
349 | { | |
350 | Elf_Data *symbols = obj->efile.symbols; | |
351 | struct bpf_program *prog; | |
352 | size_t pi, si; | |
353 | ||
354 | for (pi = 0; pi < obj->nr_programs; pi++) { | |
48cca7e4 | 355 | const char *name = NULL; |
88cda1c9 MKL |
356 | |
357 | prog = &obj->programs[pi]; | |
358 | ||
359 | for (si = 0; si < symbols->d_size / sizeof(GElf_Sym) && !name; | |
360 | si++) { | |
361 | GElf_Sym sym; | |
362 | ||
363 | if (!gelf_getsym(symbols, si, &sym)) | |
364 | continue; | |
365 | if (sym.st_shndx != prog->idx) | |
366 | continue; | |
fe4d44b2 RG |
367 | if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL) |
368 | continue; | |
88cda1c9 MKL |
369 | |
370 | name = elf_strptr(obj->efile.elf, | |
371 | obj->efile.strtabidx, | |
372 | sym.st_name); | |
373 | if (!name) { | |
374 | pr_warning("failed to get sym name string for prog %s\n", | |
375 | prog->section_name); | |
376 | return -LIBBPF_ERRNO__LIBELF; | |
377 | } | |
378 | } | |
379 | ||
9a94f277 JK |
380 | if (!name && prog->idx == obj->efile.text_shndx) |
381 | name = ".text"; | |
382 | ||
88cda1c9 MKL |
383 | if (!name) { |
384 | pr_warning("failed to find sym for prog %s\n", | |
385 | prog->section_name); | |
386 | return -EINVAL; | |
387 | } | |
9a94f277 | 388 | |
88cda1c9 MKL |
389 | prog->name = strdup(name); |
390 | if (!prog->name) { | |
391 | pr_warning("failed to allocate memory for prog sym %s\n", | |
392 | name); | |
393 | return -ENOMEM; | |
394 | } | |
395 | } | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
6c956392 WN |
400 | static struct bpf_object *bpf_object__new(const char *path, |
401 | void *obj_buf, | |
402 | size_t obj_buf_sz) | |
1a5e3fb1 WN |
403 | { |
404 | struct bpf_object *obj; | |
405 | ||
406 | obj = calloc(1, sizeof(struct bpf_object) + strlen(path) + 1); | |
407 | if (!obj) { | |
408 | pr_warning("alloc memory failed for %s\n", path); | |
6371ca3b | 409 | return ERR_PTR(-ENOMEM); |
1a5e3fb1 WN |
410 | } |
411 | ||
412 | strcpy(obj->path, path); | |
413 | obj->efile.fd = -1; | |
6c956392 WN |
414 | |
415 | /* | |
416 | * Caller of this function should also calls | |
417 | * bpf_object__elf_finish() after data collection to return | |
418 | * obj_buf to user. If not, we should duplicate the buffer to | |
419 | * avoid user freeing them before elf finish. | |
420 | */ | |
421 | obj->efile.obj_buf = obj_buf; | |
422 | obj->efile.obj_buf_sz = obj_buf_sz; | |
666810e8 | 423 | obj->efile.maps_shndx = -1; |
6c956392 | 424 | |
52d3352e | 425 | obj->loaded = false; |
9a208eff WN |
426 | |
427 | INIT_LIST_HEAD(&obj->list); | |
428 | list_add(&obj->list, &bpf_objects_list); | |
1a5e3fb1 WN |
429 | return obj; |
430 | } | |
431 | ||
432 | static void bpf_object__elf_finish(struct bpf_object *obj) | |
433 | { | |
434 | if (!obj_elf_valid(obj)) | |
435 | return; | |
436 | ||
437 | if (obj->efile.elf) { | |
438 | elf_end(obj->efile.elf); | |
439 | obj->efile.elf = NULL; | |
440 | } | |
bec7d68c | 441 | obj->efile.symbols = NULL; |
b62f06e8 WN |
442 | |
443 | zfree(&obj->efile.reloc); | |
444 | obj->efile.nr_reloc = 0; | |
1a5e3fb1 | 445 | zclose(obj->efile.fd); |
6c956392 WN |
446 | obj->efile.obj_buf = NULL; |
447 | obj->efile.obj_buf_sz = 0; | |
1a5e3fb1 WN |
448 | } |
449 | ||
450 | static int bpf_object__elf_init(struct bpf_object *obj) | |
451 | { | |
452 | int err = 0; | |
453 | GElf_Ehdr *ep; | |
454 | ||
455 | if (obj_elf_valid(obj)) { | |
456 | pr_warning("elf init: internal error\n"); | |
6371ca3b | 457 | return -LIBBPF_ERRNO__LIBELF; |
1a5e3fb1 WN |
458 | } |
459 | ||
6c956392 WN |
460 | if (obj->efile.obj_buf_sz > 0) { |
461 | /* | |
462 | * obj_buf should have been validated by | |
463 | * bpf_object__open_buffer(). | |
464 | */ | |
465 | obj->efile.elf = elf_memory(obj->efile.obj_buf, | |
466 | obj->efile.obj_buf_sz); | |
467 | } else { | |
468 | obj->efile.fd = open(obj->path, O_RDONLY); | |
469 | if (obj->efile.fd < 0) { | |
470 | pr_warning("failed to open %s: %s\n", obj->path, | |
471 | strerror(errno)); | |
472 | return -errno; | |
473 | } | |
474 | ||
475 | obj->efile.elf = elf_begin(obj->efile.fd, | |
476 | LIBBPF_ELF_C_READ_MMAP, | |
477 | NULL); | |
1a5e3fb1 WN |
478 | } |
479 | ||
1a5e3fb1 WN |
480 | if (!obj->efile.elf) { |
481 | pr_warning("failed to open %s as ELF file\n", | |
482 | obj->path); | |
6371ca3b | 483 | err = -LIBBPF_ERRNO__LIBELF; |
1a5e3fb1 WN |
484 | goto errout; |
485 | } | |
486 | ||
487 | if (!gelf_getehdr(obj->efile.elf, &obj->efile.ehdr)) { | |
488 | pr_warning("failed to get EHDR from %s\n", | |
489 | obj->path); | |
6371ca3b | 490 | err = -LIBBPF_ERRNO__FORMAT; |
1a5e3fb1 WN |
491 | goto errout; |
492 | } | |
493 | ep = &obj->efile.ehdr; | |
494 | ||
9b16137a WN |
495 | /* Old LLVM set e_machine to EM_NONE */ |
496 | if ((ep->e_type != ET_REL) || (ep->e_machine && (ep->e_machine != EM_BPF))) { | |
1a5e3fb1 WN |
497 | pr_warning("%s is not an eBPF object file\n", |
498 | obj->path); | |
6371ca3b | 499 | err = -LIBBPF_ERRNO__FORMAT; |
1a5e3fb1 WN |
500 | goto errout; |
501 | } | |
502 | ||
503 | return 0; | |
504 | errout: | |
505 | bpf_object__elf_finish(obj); | |
506 | return err; | |
507 | } | |
508 | ||
cc4228d5 WN |
509 | static int |
510 | bpf_object__check_endianness(struct bpf_object *obj) | |
511 | { | |
512 | static unsigned int const endian = 1; | |
513 | ||
514 | switch (obj->efile.ehdr.e_ident[EI_DATA]) { | |
515 | case ELFDATA2LSB: | |
516 | /* We are big endian, BPF obj is little endian. */ | |
517 | if (*(unsigned char const *)&endian != 1) | |
518 | goto mismatch; | |
519 | break; | |
520 | ||
521 | case ELFDATA2MSB: | |
522 | /* We are little endian, BPF obj is big endian. */ | |
523 | if (*(unsigned char const *)&endian != 0) | |
524 | goto mismatch; | |
525 | break; | |
526 | default: | |
6371ca3b | 527 | return -LIBBPF_ERRNO__ENDIAN; |
cc4228d5 WN |
528 | } |
529 | ||
530 | return 0; | |
531 | ||
532 | mismatch: | |
533 | pr_warning("Error: endianness mismatch.\n"); | |
6371ca3b | 534 | return -LIBBPF_ERRNO__ENDIAN; |
cc4228d5 WN |
535 | } |
536 | ||
cb1e5e96 WN |
537 | static int |
538 | bpf_object__init_license(struct bpf_object *obj, | |
539 | void *data, size_t size) | |
540 | { | |
541 | memcpy(obj->license, data, | |
542 | min(size, sizeof(obj->license) - 1)); | |
543 | pr_debug("license of %s is %s\n", obj->path, obj->license); | |
544 | return 0; | |
545 | } | |
546 | ||
547 | static int | |
548 | bpf_object__init_kversion(struct bpf_object *obj, | |
549 | void *data, size_t size) | |
550 | { | |
551 | u32 kver; | |
552 | ||
553 | if (size != sizeof(kver)) { | |
554 | pr_warning("invalid kver section in %s\n", obj->path); | |
6371ca3b | 555 | return -LIBBPF_ERRNO__FORMAT; |
cb1e5e96 WN |
556 | } |
557 | memcpy(&kver, data, sizeof(kver)); | |
558 | obj->kern_version = kver; | |
559 | pr_debug("kernel version of %s is %x\n", obj->path, | |
560 | obj->kern_version); | |
561 | return 0; | |
562 | } | |
563 | ||
4708bbda EL |
564 | static int compare_bpf_map(const void *_a, const void *_b) |
565 | { | |
566 | const struct bpf_map *a = _a; | |
567 | const struct bpf_map *b = _b; | |
9d759a9b | 568 | |
4708bbda | 569 | return a->offset - b->offset; |
0b3d1efa WN |
570 | } |
571 | ||
973170e6 | 572 | static int |
4708bbda | 573 | bpf_object__init_maps(struct bpf_object *obj) |
561bbcca | 574 | { |
b13c5c14 | 575 | int i, map_idx, map_def_sz, nr_maps = 0; |
4708bbda EL |
576 | Elf_Scn *scn; |
577 | Elf_Data *data; | |
561bbcca WN |
578 | Elf_Data *symbols = obj->efile.symbols; |
579 | ||
4708bbda EL |
580 | if (obj->efile.maps_shndx < 0) |
581 | return -EINVAL; | |
582 | if (!symbols) | |
583 | return -EINVAL; | |
584 | ||
585 | scn = elf_getscn(obj->efile.elf, obj->efile.maps_shndx); | |
586 | if (scn) | |
587 | data = elf_getdata(scn, NULL); | |
588 | if (!scn || !data) { | |
589 | pr_warning("failed to get Elf_Data from map section %d\n", | |
590 | obj->efile.maps_shndx); | |
973170e6 | 591 | return -EINVAL; |
4708bbda | 592 | } |
561bbcca | 593 | |
4708bbda EL |
594 | /* |
595 | * Count number of maps. Each map has a name. | |
596 | * Array of maps is not supported: only the first element is | |
597 | * considered. | |
598 | * | |
599 | * TODO: Detect array of map and report error. | |
600 | */ | |
561bbcca WN |
601 | for (i = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) { |
602 | GElf_Sym sym; | |
4708bbda EL |
603 | |
604 | if (!gelf_getsym(symbols, i, &sym)) | |
605 | continue; | |
606 | if (sym.st_shndx != obj->efile.maps_shndx) | |
607 | continue; | |
608 | nr_maps++; | |
609 | } | |
610 | ||
611 | /* Alloc obj->maps and fill nr_maps. */ | |
612 | pr_debug("maps in %s: %d maps in %zd bytes\n", obj->path, | |
613 | nr_maps, data->d_size); | |
614 | ||
615 | if (!nr_maps) | |
616 | return 0; | |
617 | ||
b13c5c14 CG |
618 | /* Assume equally sized map definitions */ |
619 | map_def_sz = data->d_size / nr_maps; | |
620 | if (!data->d_size || (data->d_size % nr_maps) != 0) { | |
621 | pr_warning("unable to determine map definition size " | |
622 | "section %s, %d maps in %zd bytes\n", | |
623 | obj->path, nr_maps, data->d_size); | |
624 | return -EINVAL; | |
625 | } | |
626 | ||
4708bbda EL |
627 | obj->maps = calloc(nr_maps, sizeof(obj->maps[0])); |
628 | if (!obj->maps) { | |
629 | pr_warning("alloc maps for object failed\n"); | |
630 | return -ENOMEM; | |
631 | } | |
632 | obj->nr_maps = nr_maps; | |
633 | ||
634 | /* | |
635 | * fill all fd with -1 so won't close incorrect | |
636 | * fd (fd=0 is stdin) when failure (zclose won't close | |
637 | * negative fd)). | |
638 | */ | |
639 | for (i = 0; i < nr_maps; i++) | |
640 | obj->maps[i].fd = -1; | |
641 | ||
642 | /* | |
643 | * Fill obj->maps using data in "maps" section. | |
644 | */ | |
645 | for (i = 0, map_idx = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) { | |
646 | GElf_Sym sym; | |
561bbcca | 647 | const char *map_name; |
4708bbda | 648 | struct bpf_map_def *def; |
561bbcca WN |
649 | |
650 | if (!gelf_getsym(symbols, i, &sym)) | |
651 | continue; | |
666810e8 | 652 | if (sym.st_shndx != obj->efile.maps_shndx) |
561bbcca WN |
653 | continue; |
654 | ||
655 | map_name = elf_strptr(obj->efile.elf, | |
77ba9a5b | 656 | obj->efile.strtabidx, |
561bbcca | 657 | sym.st_name); |
4708bbda | 658 | obj->maps[map_idx].offset = sym.st_value; |
b13c5c14 | 659 | if (sym.st_value + map_def_sz > data->d_size) { |
4708bbda EL |
660 | pr_warning("corrupted maps section in %s: last map \"%s\" too small\n", |
661 | obj->path, map_name); | |
662 | return -EINVAL; | |
561bbcca | 663 | } |
4708bbda | 664 | |
561bbcca | 665 | obj->maps[map_idx].name = strdup(map_name); |
973170e6 WN |
666 | if (!obj->maps[map_idx].name) { |
667 | pr_warning("failed to alloc map name\n"); | |
668 | return -ENOMEM; | |
669 | } | |
4708bbda | 670 | pr_debug("map %d is \"%s\"\n", map_idx, |
561bbcca | 671 | obj->maps[map_idx].name); |
4708bbda | 672 | def = (struct bpf_map_def *)(data->d_buf + sym.st_value); |
b13c5c14 CG |
673 | /* |
674 | * If the definition of the map in the object file fits in | |
675 | * bpf_map_def, copy it. Any extra fields in our version | |
676 | * of bpf_map_def will default to zero as a result of the | |
677 | * calloc above. | |
678 | */ | |
679 | if (map_def_sz <= sizeof(struct bpf_map_def)) { | |
680 | memcpy(&obj->maps[map_idx].def, def, map_def_sz); | |
681 | } else { | |
682 | /* | |
683 | * Here the map structure being read is bigger than what | |
684 | * we expect, truncate if the excess bits are all zero. | |
685 | * If they are not zero, reject this map as | |
686 | * incompatible. | |
687 | */ | |
688 | char *b; | |
689 | for (b = ((char *)def) + sizeof(struct bpf_map_def); | |
690 | b < ((char *)def) + map_def_sz; b++) { | |
691 | if (*b != 0) { | |
692 | pr_warning("maps section in %s: \"%s\" " | |
693 | "has unrecognized, non-zero " | |
694 | "options\n", | |
695 | obj->path, map_name); | |
696 | return -EINVAL; | |
697 | } | |
698 | } | |
699 | memcpy(&obj->maps[map_idx].def, def, | |
700 | sizeof(struct bpf_map_def)); | |
701 | } | |
4708bbda | 702 | map_idx++; |
561bbcca | 703 | } |
4708bbda EL |
704 | |
705 | qsort(obj->maps, obj->nr_maps, sizeof(obj->maps[0]), compare_bpf_map); | |
b13c5c14 | 706 | return 0; |
561bbcca WN |
707 | } |
708 | ||
e3d91b0c JDB |
709 | static bool section_have_execinstr(struct bpf_object *obj, int idx) |
710 | { | |
711 | Elf_Scn *scn; | |
712 | GElf_Shdr sh; | |
713 | ||
714 | scn = elf_getscn(obj->efile.elf, idx); | |
715 | if (!scn) | |
716 | return false; | |
717 | ||
718 | if (gelf_getshdr(scn, &sh) != &sh) | |
719 | return false; | |
720 | ||
721 | if (sh.sh_flags & SHF_EXECINSTR) | |
722 | return true; | |
723 | ||
724 | return false; | |
725 | } | |
726 | ||
29603665 WN |
727 | static int bpf_object__elf_collect(struct bpf_object *obj) |
728 | { | |
729 | Elf *elf = obj->efile.elf; | |
730 | GElf_Ehdr *ep = &obj->efile.ehdr; | |
731 | Elf_Scn *scn = NULL; | |
666810e8 | 732 | int idx = 0, err = 0; |
29603665 WN |
733 | |
734 | /* Elf is corrupted/truncated, avoid calling elf_strptr. */ | |
735 | if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) { | |
736 | pr_warning("failed to get e_shstrndx from %s\n", | |
737 | obj->path); | |
6371ca3b | 738 | return -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
739 | } |
740 | ||
741 | while ((scn = elf_nextscn(elf, scn)) != NULL) { | |
742 | char *name; | |
743 | GElf_Shdr sh; | |
744 | Elf_Data *data; | |
745 | ||
746 | idx++; | |
747 | if (gelf_getshdr(scn, &sh) != &sh) { | |
077c066a JDB |
748 | pr_warning("failed to get section(%d) header from %s\n", |
749 | idx, obj->path); | |
6371ca3b | 750 | err = -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
751 | goto out; |
752 | } | |
753 | ||
754 | name = elf_strptr(elf, ep->e_shstrndx, sh.sh_name); | |
755 | if (!name) { | |
077c066a JDB |
756 | pr_warning("failed to get section(%d) name from %s\n", |
757 | idx, obj->path); | |
6371ca3b | 758 | err = -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
759 | goto out; |
760 | } | |
761 | ||
762 | data = elf_getdata(scn, 0); | |
763 | if (!data) { | |
077c066a JDB |
764 | pr_warning("failed to get section(%d) data from %s(%s)\n", |
765 | idx, name, obj->path); | |
6371ca3b | 766 | err = -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
767 | goto out; |
768 | } | |
077c066a JDB |
769 | pr_debug("section(%d) %s, size %ld, link %d, flags %lx, type=%d\n", |
770 | idx, name, (unsigned long)data->d_size, | |
29603665 WN |
771 | (int)sh.sh_link, (unsigned long)sh.sh_flags, |
772 | (int)sh.sh_type); | |
cb1e5e96 WN |
773 | |
774 | if (strcmp(name, "license") == 0) | |
775 | err = bpf_object__init_license(obj, | |
776 | data->d_buf, | |
777 | data->d_size); | |
778 | else if (strcmp(name, "version") == 0) | |
779 | err = bpf_object__init_kversion(obj, | |
780 | data->d_buf, | |
781 | data->d_size); | |
4708bbda | 782 | else if (strcmp(name, "maps") == 0) |
666810e8 | 783 | obj->efile.maps_shndx = idx; |
8a138aed MKL |
784 | else if (strcmp(name, BTF_ELF_SEC) == 0) { |
785 | obj->btf = btf__new(data->d_buf, data->d_size, | |
786 | __pr_debug); | |
787 | if (IS_ERR(obj->btf)) { | |
788 | pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n", | |
789 | BTF_ELF_SEC, PTR_ERR(obj->btf)); | |
790 | obj->btf = NULL; | |
791 | } | |
792 | } else if (sh.sh_type == SHT_SYMTAB) { | |
bec7d68c WN |
793 | if (obj->efile.symbols) { |
794 | pr_warning("bpf: multiple SYMTAB in %s\n", | |
795 | obj->path); | |
6371ca3b | 796 | err = -LIBBPF_ERRNO__FORMAT; |
77ba9a5b | 797 | } else { |
bec7d68c | 798 | obj->efile.symbols = data; |
77ba9a5b WN |
799 | obj->efile.strtabidx = sh.sh_link; |
800 | } | |
a5b8bd47 WN |
801 | } else if ((sh.sh_type == SHT_PROGBITS) && |
802 | (sh.sh_flags & SHF_EXECINSTR) && | |
803 | (data->d_size > 0)) { | |
48cca7e4 AS |
804 | if (strcmp(name, ".text") == 0) |
805 | obj->efile.text_shndx = idx; | |
a5b8bd47 WN |
806 | err = bpf_object__add_program(obj, data->d_buf, |
807 | data->d_size, name, idx); | |
808 | if (err) { | |
6371ca3b WN |
809 | char errmsg[STRERR_BUFSIZE]; |
810 | ||
a5b8bd47 WN |
811 | strerror_r(-err, errmsg, sizeof(errmsg)); |
812 | pr_warning("failed to alloc program %s (%s): %s", | |
813 | name, obj->path, errmsg); | |
814 | } | |
b62f06e8 WN |
815 | } else if (sh.sh_type == SHT_REL) { |
816 | void *reloc = obj->efile.reloc; | |
817 | int nr_reloc = obj->efile.nr_reloc + 1; | |
e3d91b0c JDB |
818 | int sec = sh.sh_info; /* points to other section */ |
819 | ||
820 | /* Only do relo for section with exec instructions */ | |
821 | if (!section_have_execinstr(obj, sec)) { | |
822 | pr_debug("skip relo %s(%d) for section(%d)\n", | |
823 | name, idx, sec); | |
824 | continue; | |
825 | } | |
b62f06e8 | 826 | |
531b014e JK |
827 | reloc = reallocarray(reloc, nr_reloc, |
828 | sizeof(*obj->efile.reloc)); | |
b62f06e8 WN |
829 | if (!reloc) { |
830 | pr_warning("realloc failed\n"); | |
831 | err = -ENOMEM; | |
832 | } else { | |
833 | int n = nr_reloc - 1; | |
834 | ||
835 | obj->efile.reloc = reloc; | |
836 | obj->efile.nr_reloc = nr_reloc; | |
837 | ||
838 | obj->efile.reloc[n].shdr = sh; | |
839 | obj->efile.reloc[n].data = data; | |
840 | } | |
077c066a JDB |
841 | } else { |
842 | pr_debug("skip section(%d) %s\n", idx, name); | |
bec7d68c | 843 | } |
cb1e5e96 WN |
844 | if (err) |
845 | goto out; | |
29603665 | 846 | } |
561bbcca | 847 | |
77ba9a5b WN |
848 | if (!obj->efile.strtabidx || obj->efile.strtabidx >= idx) { |
849 | pr_warning("Corrupted ELF file: index of strtab invalid\n"); | |
850 | return LIBBPF_ERRNO__FORMAT; | |
851 | } | |
88cda1c9 | 852 | if (obj->efile.maps_shndx >= 0) { |
4708bbda | 853 | err = bpf_object__init_maps(obj); |
88cda1c9 MKL |
854 | if (err) |
855 | goto out; | |
856 | } | |
857 | err = bpf_object__init_prog_names(obj); | |
29603665 WN |
858 | out: |
859 | return err; | |
860 | } | |
861 | ||
34090915 WN |
862 | static struct bpf_program * |
863 | bpf_object__find_prog_by_idx(struct bpf_object *obj, int idx) | |
864 | { | |
865 | struct bpf_program *prog; | |
866 | size_t i; | |
867 | ||
868 | for (i = 0; i < obj->nr_programs; i++) { | |
869 | prog = &obj->programs[i]; | |
870 | if (prog->idx == idx) | |
871 | return prog; | |
872 | } | |
873 | return NULL; | |
874 | } | |
875 | ||
6d4b198b JK |
876 | struct bpf_program * |
877 | bpf_object__find_program_by_title(struct bpf_object *obj, const char *title) | |
878 | { | |
879 | struct bpf_program *pos; | |
880 | ||
881 | bpf_object__for_each_program(pos, obj) { | |
882 | if (pos->section_name && !strcmp(pos->section_name, title)) | |
883 | return pos; | |
884 | } | |
885 | return NULL; | |
886 | } | |
887 | ||
34090915 | 888 | static int |
48cca7e4 AS |
889 | bpf_program__collect_reloc(struct bpf_program *prog, GElf_Shdr *shdr, |
890 | Elf_Data *data, struct bpf_object *obj) | |
34090915 | 891 | { |
48cca7e4 AS |
892 | Elf_Data *symbols = obj->efile.symbols; |
893 | int text_shndx = obj->efile.text_shndx; | |
894 | int maps_shndx = obj->efile.maps_shndx; | |
895 | struct bpf_map *maps = obj->maps; | |
896 | size_t nr_maps = obj->nr_maps; | |
34090915 WN |
897 | int i, nrels; |
898 | ||
899 | pr_debug("collecting relocating info for: '%s'\n", | |
900 | prog->section_name); | |
901 | nrels = shdr->sh_size / shdr->sh_entsize; | |
902 | ||
903 | prog->reloc_desc = malloc(sizeof(*prog->reloc_desc) * nrels); | |
904 | if (!prog->reloc_desc) { | |
905 | pr_warning("failed to alloc memory in relocation\n"); | |
906 | return -ENOMEM; | |
907 | } | |
908 | prog->nr_reloc = nrels; | |
909 | ||
910 | for (i = 0; i < nrels; i++) { | |
911 | GElf_Sym sym; | |
912 | GElf_Rel rel; | |
913 | unsigned int insn_idx; | |
914 | struct bpf_insn *insns = prog->insns; | |
915 | size_t map_idx; | |
916 | ||
917 | if (!gelf_getrel(data, i, &rel)) { | |
918 | pr_warning("relocation: failed to get %d reloc\n", i); | |
6371ca3b | 919 | return -LIBBPF_ERRNO__FORMAT; |
34090915 WN |
920 | } |
921 | ||
34090915 WN |
922 | if (!gelf_getsym(symbols, |
923 | GELF_R_SYM(rel.r_info), | |
924 | &sym)) { | |
925 | pr_warning("relocation: symbol %"PRIx64" not found\n", | |
926 | GELF_R_SYM(rel.r_info)); | |
6371ca3b | 927 | return -LIBBPF_ERRNO__FORMAT; |
34090915 | 928 | } |
7d9890ef DM |
929 | pr_debug("relo for %lld value %lld name %d\n", |
930 | (long long) (rel.r_info >> 32), | |
931 | (long long) sym.st_value, sym.st_name); | |
34090915 | 932 | |
48cca7e4 | 933 | if (sym.st_shndx != maps_shndx && sym.st_shndx != text_shndx) { |
666810e8 WN |
934 | pr_warning("Program '%s' contains non-map related relo data pointing to section %u\n", |
935 | prog->section_name, sym.st_shndx); | |
936 | return -LIBBPF_ERRNO__RELOC; | |
937 | } | |
938 | ||
939 | insn_idx = rel.r_offset / sizeof(struct bpf_insn); | |
940 | pr_debug("relocation: insn_idx=%u\n", insn_idx); | |
941 | ||
48cca7e4 AS |
942 | if (insns[insn_idx].code == (BPF_JMP | BPF_CALL)) { |
943 | if (insns[insn_idx].src_reg != BPF_PSEUDO_CALL) { | |
944 | pr_warning("incorrect bpf_call opcode\n"); | |
945 | return -LIBBPF_ERRNO__RELOC; | |
946 | } | |
947 | prog->reloc_desc[i].type = RELO_CALL; | |
948 | prog->reloc_desc[i].insn_idx = insn_idx; | |
949 | prog->reloc_desc[i].text_off = sym.st_value; | |
9a94f277 | 950 | obj->has_pseudo_calls = true; |
48cca7e4 AS |
951 | continue; |
952 | } | |
953 | ||
34090915 WN |
954 | if (insns[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) { |
955 | pr_warning("bpf: relocation: invalid relo for insns[%d].code 0x%x\n", | |
956 | insn_idx, insns[insn_idx].code); | |
6371ca3b | 957 | return -LIBBPF_ERRNO__RELOC; |
34090915 WN |
958 | } |
959 | ||
94e5adec JS |
960 | /* TODO: 'maps' is sorted. We can use bsearch to make it faster. */ |
961 | for (map_idx = 0; map_idx < nr_maps; map_idx++) { | |
962 | if (maps[map_idx].offset == sym.st_value) { | |
963 | pr_debug("relocation: find map %zd (%s) for insn %u\n", | |
964 | map_idx, maps[map_idx].name, insn_idx); | |
965 | break; | |
966 | } | |
967 | } | |
968 | ||
34090915 WN |
969 | if (map_idx >= nr_maps) { |
970 | pr_warning("bpf relocation: map_idx %d large than %d\n", | |
971 | (int)map_idx, (int)nr_maps - 1); | |
6371ca3b | 972 | return -LIBBPF_ERRNO__RELOC; |
34090915 WN |
973 | } |
974 | ||
48cca7e4 | 975 | prog->reloc_desc[i].type = RELO_LD64; |
34090915 WN |
976 | prog->reloc_desc[i].insn_idx = insn_idx; |
977 | prog->reloc_desc[i].map_idx = map_idx; | |
978 | } | |
979 | return 0; | |
980 | } | |
981 | ||
8a138aed MKL |
982 | static int bpf_map_find_btf_info(struct bpf_map *map, const struct btf *btf) |
983 | { | |
984 | struct bpf_map_def *def = &map->def; | |
985 | const size_t max_name = 256; | |
986 | int64_t key_size, value_size; | |
987 | int32_t key_id, value_id; | |
988 | char name[max_name]; | |
989 | ||
990 | /* Find key type by name from BTF */ | |
991 | if (snprintf(name, max_name, "%s_key", map->name) == max_name) { | |
992 | pr_warning("map:%s length of BTF key_type:%s_key is too long\n", | |
993 | map->name, map->name); | |
994 | return -EINVAL; | |
995 | } | |
996 | ||
997 | key_id = btf__find_by_name(btf, name); | |
998 | if (key_id < 0) { | |
999 | pr_debug("map:%s key_type:%s cannot be found in BTF\n", | |
1000 | map->name, name); | |
1001 | return key_id; | |
1002 | } | |
1003 | ||
1004 | key_size = btf__resolve_size(btf, key_id); | |
1005 | if (key_size < 0) { | |
1006 | pr_warning("map:%s key_type:%s cannot get the BTF type_size\n", | |
1007 | map->name, name); | |
1008 | return key_size; | |
1009 | } | |
1010 | ||
1011 | if (def->key_size != key_size) { | |
a1c81810 SB |
1012 | pr_warning("map:%s key_type:%s has BTF type_size:%u != key_size:%u\n", |
1013 | map->name, name, (unsigned int)key_size, def->key_size); | |
8a138aed MKL |
1014 | return -EINVAL; |
1015 | } | |
1016 | ||
1017 | /* Find value type from BTF */ | |
1018 | if (snprintf(name, max_name, "%s_value", map->name) == max_name) { | |
1019 | pr_warning("map:%s length of BTF value_type:%s_value is too long\n", | |
1020 | map->name, map->name); | |
1021 | return -EINVAL; | |
1022 | } | |
1023 | ||
1024 | value_id = btf__find_by_name(btf, name); | |
1025 | if (value_id < 0) { | |
1026 | pr_debug("map:%s value_type:%s cannot be found in BTF\n", | |
1027 | map->name, name); | |
1028 | return value_id; | |
1029 | } | |
1030 | ||
1031 | value_size = btf__resolve_size(btf, value_id); | |
1032 | if (value_size < 0) { | |
1033 | pr_warning("map:%s value_type:%s cannot get the BTF type_size\n", | |
1034 | map->name, name); | |
1035 | return value_size; | |
1036 | } | |
1037 | ||
1038 | if (def->value_size != value_size) { | |
a1c81810 SB |
1039 | pr_warning("map:%s value_type:%s has BTF type_size:%u != value_size:%u\n", |
1040 | map->name, name, (unsigned int)value_size, def->value_size); | |
8a138aed MKL |
1041 | return -EINVAL; |
1042 | } | |
1043 | ||
61746dbe MKL |
1044 | map->btf_key_type_id = key_id; |
1045 | map->btf_value_type_id = value_id; | |
8a138aed MKL |
1046 | |
1047 | return 0; | |
1048 | } | |
1049 | ||
26736eb9 JK |
1050 | int bpf_map__reuse_fd(struct bpf_map *map, int fd) |
1051 | { | |
1052 | struct bpf_map_info info = {}; | |
1053 | __u32 len = sizeof(info); | |
1054 | int new_fd, err; | |
1055 | char *new_name; | |
1056 | ||
1057 | err = bpf_obj_get_info_by_fd(fd, &info, &len); | |
1058 | if (err) | |
1059 | return err; | |
1060 | ||
1061 | new_name = strdup(info.name); | |
1062 | if (!new_name) | |
1063 | return -errno; | |
1064 | ||
1065 | new_fd = open("/", O_RDONLY | O_CLOEXEC); | |
1066 | if (new_fd < 0) | |
1067 | goto err_free_new_name; | |
1068 | ||
1069 | new_fd = dup3(fd, new_fd, O_CLOEXEC); | |
1070 | if (new_fd < 0) | |
1071 | goto err_close_new_fd; | |
1072 | ||
1073 | err = zclose(map->fd); | |
1074 | if (err) | |
1075 | goto err_close_new_fd; | |
1076 | free(map->name); | |
1077 | ||
1078 | map->fd = new_fd; | |
1079 | map->name = new_name; | |
1080 | map->def.type = info.type; | |
1081 | map->def.key_size = info.key_size; | |
1082 | map->def.value_size = info.value_size; | |
1083 | map->def.max_entries = info.max_entries; | |
1084 | map->def.map_flags = info.map_flags; | |
1085 | map->btf_key_type_id = info.btf_key_type_id; | |
1086 | map->btf_value_type_id = info.btf_value_type_id; | |
1087 | ||
1088 | return 0; | |
1089 | ||
1090 | err_close_new_fd: | |
1091 | close(new_fd); | |
1092 | err_free_new_name: | |
1093 | free(new_name); | |
1094 | return -errno; | |
1095 | } | |
1096 | ||
52d3352e WN |
1097 | static int |
1098 | bpf_object__create_maps(struct bpf_object *obj) | |
1099 | { | |
8a138aed | 1100 | struct bpf_create_map_attr create_attr = {}; |
52d3352e | 1101 | unsigned int i; |
8a138aed | 1102 | int err; |
52d3352e | 1103 | |
9d759a9b | 1104 | for (i = 0; i < obj->nr_maps; i++) { |
8a138aed MKL |
1105 | struct bpf_map *map = &obj->maps[i]; |
1106 | struct bpf_map_def *def = &map->def; | |
1107 | int *pfd = &map->fd; | |
1108 | ||
26736eb9 JK |
1109 | if (map->fd >= 0) { |
1110 | pr_debug("skip map create (preset) %s: fd=%d\n", | |
1111 | map->name, map->fd); | |
1112 | continue; | |
1113 | } | |
1114 | ||
8a138aed | 1115 | create_attr.name = map->name; |
f0307a7e | 1116 | create_attr.map_ifindex = map->map_ifindex; |
8a138aed MKL |
1117 | create_attr.map_type = def->type; |
1118 | create_attr.map_flags = def->map_flags; | |
1119 | create_attr.key_size = def->key_size; | |
1120 | create_attr.value_size = def->value_size; | |
1121 | create_attr.max_entries = def->max_entries; | |
1122 | create_attr.btf_fd = 0; | |
61746dbe MKL |
1123 | create_attr.btf_key_type_id = 0; |
1124 | create_attr.btf_value_type_id = 0; | |
8a138aed MKL |
1125 | |
1126 | if (obj->btf && !bpf_map_find_btf_info(map, obj->btf)) { | |
1127 | create_attr.btf_fd = btf__fd(obj->btf); | |
61746dbe MKL |
1128 | create_attr.btf_key_type_id = map->btf_key_type_id; |
1129 | create_attr.btf_value_type_id = map->btf_value_type_id; | |
8a138aed MKL |
1130 | } |
1131 | ||
1132 | *pfd = bpf_create_map_xattr(&create_attr); | |
61746dbe | 1133 | if (*pfd < 0 && create_attr.btf_key_type_id) { |
8a138aed MKL |
1134 | pr_warning("Error in bpf_create_map_xattr(%s):%s(%d). Retrying without BTF.\n", |
1135 | map->name, strerror(errno), errno); | |
1136 | create_attr.btf_fd = 0; | |
61746dbe MKL |
1137 | create_attr.btf_key_type_id = 0; |
1138 | create_attr.btf_value_type_id = 0; | |
1139 | map->btf_key_type_id = 0; | |
1140 | map->btf_value_type_id = 0; | |
8a138aed MKL |
1141 | *pfd = bpf_create_map_xattr(&create_attr); |
1142 | } | |
1143 | ||
52d3352e WN |
1144 | if (*pfd < 0) { |
1145 | size_t j; | |
52d3352e | 1146 | |
8a138aed | 1147 | err = *pfd; |
49bf4b36 | 1148 | pr_warning("failed to create map (name: '%s'): %s\n", |
8a138aed | 1149 | map->name, |
52d3352e WN |
1150 | strerror(errno)); |
1151 | for (j = 0; j < i; j++) | |
9d759a9b | 1152 | zclose(obj->maps[j].fd); |
52d3352e WN |
1153 | return err; |
1154 | } | |
8a138aed | 1155 | pr_debug("create map %s: fd=%d\n", map->name, *pfd); |
52d3352e WN |
1156 | } |
1157 | ||
52d3352e WN |
1158 | return 0; |
1159 | } | |
1160 | ||
48cca7e4 AS |
1161 | static int |
1162 | bpf_program__reloc_text(struct bpf_program *prog, struct bpf_object *obj, | |
1163 | struct reloc_desc *relo) | |
1164 | { | |
1165 | struct bpf_insn *insn, *new_insn; | |
1166 | struct bpf_program *text; | |
1167 | size_t new_cnt; | |
1168 | ||
1169 | if (relo->type != RELO_CALL) | |
1170 | return -LIBBPF_ERRNO__RELOC; | |
1171 | ||
1172 | if (prog->idx == obj->efile.text_shndx) { | |
1173 | pr_warning("relo in .text insn %d into off %d\n", | |
1174 | relo->insn_idx, relo->text_off); | |
1175 | return -LIBBPF_ERRNO__RELOC; | |
1176 | } | |
1177 | ||
1178 | if (prog->main_prog_cnt == 0) { | |
1179 | text = bpf_object__find_prog_by_idx(obj, obj->efile.text_shndx); | |
1180 | if (!text) { | |
1181 | pr_warning("no .text section found yet relo into text exist\n"); | |
1182 | return -LIBBPF_ERRNO__RELOC; | |
1183 | } | |
1184 | new_cnt = prog->insns_cnt + text->insns_cnt; | |
531b014e | 1185 | new_insn = reallocarray(prog->insns, new_cnt, sizeof(*insn)); |
48cca7e4 AS |
1186 | if (!new_insn) { |
1187 | pr_warning("oom in prog realloc\n"); | |
1188 | return -ENOMEM; | |
1189 | } | |
1190 | memcpy(new_insn + prog->insns_cnt, text->insns, | |
1191 | text->insns_cnt * sizeof(*insn)); | |
1192 | prog->insns = new_insn; | |
1193 | prog->main_prog_cnt = prog->insns_cnt; | |
1194 | prog->insns_cnt = new_cnt; | |
b1a2ce82 JC |
1195 | pr_debug("added %zd insn from %s to prog %s\n", |
1196 | text->insns_cnt, text->section_name, | |
1197 | prog->section_name); | |
48cca7e4 AS |
1198 | } |
1199 | insn = &prog->insns[relo->insn_idx]; | |
1200 | insn->imm += prog->main_prog_cnt - relo->insn_idx; | |
48cca7e4 AS |
1201 | return 0; |
1202 | } | |
1203 | ||
8a47a6c5 | 1204 | static int |
9d759a9b | 1205 | bpf_program__relocate(struct bpf_program *prog, struct bpf_object *obj) |
8a47a6c5 | 1206 | { |
48cca7e4 | 1207 | int i, err; |
8a47a6c5 WN |
1208 | |
1209 | if (!prog || !prog->reloc_desc) | |
1210 | return 0; | |
1211 | ||
1212 | for (i = 0; i < prog->nr_reloc; i++) { | |
48cca7e4 AS |
1213 | if (prog->reloc_desc[i].type == RELO_LD64) { |
1214 | struct bpf_insn *insns = prog->insns; | |
1215 | int insn_idx, map_idx; | |
8a47a6c5 | 1216 | |
48cca7e4 AS |
1217 | insn_idx = prog->reloc_desc[i].insn_idx; |
1218 | map_idx = prog->reloc_desc[i].map_idx; | |
8a47a6c5 | 1219 | |
48cca7e4 AS |
1220 | if (insn_idx >= (int)prog->insns_cnt) { |
1221 | pr_warning("relocation out of range: '%s'\n", | |
1222 | prog->section_name); | |
1223 | return -LIBBPF_ERRNO__RELOC; | |
1224 | } | |
1225 | insns[insn_idx].src_reg = BPF_PSEUDO_MAP_FD; | |
1226 | insns[insn_idx].imm = obj->maps[map_idx].fd; | |
1227 | } else { | |
1228 | err = bpf_program__reloc_text(prog, obj, | |
1229 | &prog->reloc_desc[i]); | |
1230 | if (err) | |
1231 | return err; | |
8a47a6c5 | 1232 | } |
8a47a6c5 WN |
1233 | } |
1234 | ||
1235 | zfree(&prog->reloc_desc); | |
1236 | prog->nr_reloc = 0; | |
1237 | return 0; | |
1238 | } | |
1239 | ||
1240 | ||
1241 | static int | |
1242 | bpf_object__relocate(struct bpf_object *obj) | |
1243 | { | |
1244 | struct bpf_program *prog; | |
1245 | size_t i; | |
1246 | int err; | |
1247 | ||
1248 | for (i = 0; i < obj->nr_programs; i++) { | |
1249 | prog = &obj->programs[i]; | |
1250 | ||
9d759a9b | 1251 | err = bpf_program__relocate(prog, obj); |
8a47a6c5 WN |
1252 | if (err) { |
1253 | pr_warning("failed to relocate '%s'\n", | |
1254 | prog->section_name); | |
1255 | return err; | |
1256 | } | |
1257 | } | |
1258 | return 0; | |
1259 | } | |
1260 | ||
34090915 WN |
1261 | static int bpf_object__collect_reloc(struct bpf_object *obj) |
1262 | { | |
1263 | int i, err; | |
1264 | ||
1265 | if (!obj_elf_valid(obj)) { | |
1266 | pr_warning("Internal error: elf object is closed\n"); | |
6371ca3b | 1267 | return -LIBBPF_ERRNO__INTERNAL; |
34090915 WN |
1268 | } |
1269 | ||
1270 | for (i = 0; i < obj->efile.nr_reloc; i++) { | |
1271 | GElf_Shdr *shdr = &obj->efile.reloc[i].shdr; | |
1272 | Elf_Data *data = obj->efile.reloc[i].data; | |
1273 | int idx = shdr->sh_info; | |
1274 | struct bpf_program *prog; | |
34090915 WN |
1275 | |
1276 | if (shdr->sh_type != SHT_REL) { | |
1277 | pr_warning("internal error at %d\n", __LINE__); | |
6371ca3b | 1278 | return -LIBBPF_ERRNO__INTERNAL; |
34090915 WN |
1279 | } |
1280 | ||
1281 | prog = bpf_object__find_prog_by_idx(obj, idx); | |
1282 | if (!prog) { | |
077c066a | 1283 | pr_warning("relocation failed: no section(%d)\n", idx); |
6371ca3b | 1284 | return -LIBBPF_ERRNO__RELOC; |
34090915 WN |
1285 | } |
1286 | ||
48cca7e4 | 1287 | err = bpf_program__collect_reloc(prog, |
34090915 | 1288 | shdr, data, |
48cca7e4 | 1289 | obj); |
34090915 | 1290 | if (err) |
6371ca3b | 1291 | return err; |
34090915 WN |
1292 | } |
1293 | return 0; | |
1294 | } | |
1295 | ||
55cffde2 | 1296 | static int |
d7be143b AI |
1297 | load_program(enum bpf_prog_type type, enum bpf_attach_type expected_attach_type, |
1298 | const char *name, struct bpf_insn *insns, int insns_cnt, | |
f0307a7e | 1299 | char *license, u32 kern_version, int *pfd, int prog_ifindex) |
55cffde2 | 1300 | { |
d7be143b | 1301 | struct bpf_load_program_attr load_attr; |
55cffde2 | 1302 | char *log_buf; |
d7be143b | 1303 | int ret; |
55cffde2 | 1304 | |
d7be143b AI |
1305 | memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); |
1306 | load_attr.prog_type = type; | |
1307 | load_attr.expected_attach_type = expected_attach_type; | |
1308 | load_attr.name = name; | |
1309 | load_attr.insns = insns; | |
1310 | load_attr.insns_cnt = insns_cnt; | |
1311 | load_attr.license = license; | |
1312 | load_attr.kern_version = kern_version; | |
f0307a7e | 1313 | load_attr.prog_ifindex = prog_ifindex; |
d7be143b AI |
1314 | |
1315 | if (!load_attr.insns || !load_attr.insns_cnt) | |
55cffde2 WN |
1316 | return -EINVAL; |
1317 | ||
1318 | log_buf = malloc(BPF_LOG_BUF_SIZE); | |
1319 | if (!log_buf) | |
1320 | pr_warning("Alloc log buffer for bpf loader error, continue without log\n"); | |
1321 | ||
d7be143b | 1322 | ret = bpf_load_program_xattr(&load_attr, log_buf, BPF_LOG_BUF_SIZE); |
55cffde2 WN |
1323 | |
1324 | if (ret >= 0) { | |
1325 | *pfd = ret; | |
1326 | ret = 0; | |
1327 | goto out; | |
1328 | } | |
1329 | ||
6371ca3b | 1330 | ret = -LIBBPF_ERRNO__LOAD; |
55cffde2 WN |
1331 | pr_warning("load bpf program failed: %s\n", strerror(errno)); |
1332 | ||
6371ca3b WN |
1333 | if (log_buf && log_buf[0] != '\0') { |
1334 | ret = -LIBBPF_ERRNO__VERIFY; | |
55cffde2 WN |
1335 | pr_warning("-- BEGIN DUMP LOG ---\n"); |
1336 | pr_warning("\n%s\n", log_buf); | |
1337 | pr_warning("-- END LOG --\n"); | |
d7be143b AI |
1338 | } else if (load_attr.insns_cnt >= BPF_MAXINSNS) { |
1339 | pr_warning("Program too large (%zu insns), at most %d insns\n", | |
1340 | load_attr.insns_cnt, BPF_MAXINSNS); | |
705fa219 | 1341 | ret = -LIBBPF_ERRNO__PROG2BIG; |
6371ca3b | 1342 | } else { |
705fa219 | 1343 | /* Wrong program type? */ |
d7be143b | 1344 | if (load_attr.prog_type != BPF_PROG_TYPE_KPROBE) { |
705fa219 WN |
1345 | int fd; |
1346 | ||
d7be143b AI |
1347 | load_attr.prog_type = BPF_PROG_TYPE_KPROBE; |
1348 | load_attr.expected_attach_type = 0; | |
1349 | fd = bpf_load_program_xattr(&load_attr, NULL, 0); | |
705fa219 WN |
1350 | if (fd >= 0) { |
1351 | close(fd); | |
1352 | ret = -LIBBPF_ERRNO__PROGTYPE; | |
1353 | goto out; | |
1354 | } | |
6371ca3b | 1355 | } |
705fa219 WN |
1356 | |
1357 | if (log_buf) | |
1358 | ret = -LIBBPF_ERRNO__KVER; | |
55cffde2 WN |
1359 | } |
1360 | ||
1361 | out: | |
1362 | free(log_buf); | |
1363 | return ret; | |
1364 | } | |
1365 | ||
1366 | static int | |
1367 | bpf_program__load(struct bpf_program *prog, | |
1368 | char *license, u32 kern_version) | |
1369 | { | |
b580563e | 1370 | int err = 0, fd, i; |
55cffde2 | 1371 | |
b580563e WN |
1372 | if (prog->instances.nr < 0 || !prog->instances.fds) { |
1373 | if (prog->preprocessor) { | |
1374 | pr_warning("Internal error: can't load program '%s'\n", | |
1375 | prog->section_name); | |
1376 | return -LIBBPF_ERRNO__INTERNAL; | |
1377 | } | |
55cffde2 | 1378 | |
b580563e WN |
1379 | prog->instances.fds = malloc(sizeof(int)); |
1380 | if (!prog->instances.fds) { | |
1381 | pr_warning("Not enough memory for BPF fds\n"); | |
1382 | return -ENOMEM; | |
1383 | } | |
1384 | prog->instances.nr = 1; | |
1385 | prog->instances.fds[0] = -1; | |
1386 | } | |
1387 | ||
1388 | if (!prog->preprocessor) { | |
1389 | if (prog->instances.nr != 1) { | |
1390 | pr_warning("Program '%s' is inconsistent: nr(%d) != 1\n", | |
1391 | prog->section_name, prog->instances.nr); | |
1392 | } | |
d7be143b AI |
1393 | err = load_program(prog->type, prog->expected_attach_type, |
1394 | prog->name, prog->insns, prog->insns_cnt, | |
f0307a7e DB |
1395 | license, kern_version, &fd, |
1396 | prog->prog_ifindex); | |
b580563e WN |
1397 | if (!err) |
1398 | prog->instances.fds[0] = fd; | |
1399 | goto out; | |
1400 | } | |
1401 | ||
1402 | for (i = 0; i < prog->instances.nr; i++) { | |
1403 | struct bpf_prog_prep_result result; | |
1404 | bpf_program_prep_t preprocessor = prog->preprocessor; | |
1405 | ||
1406 | bzero(&result, sizeof(result)); | |
1407 | err = preprocessor(prog, i, prog->insns, | |
1408 | prog->insns_cnt, &result); | |
1409 | if (err) { | |
1410 | pr_warning("Preprocessing the %dth instance of program '%s' failed\n", | |
1411 | i, prog->section_name); | |
1412 | goto out; | |
1413 | } | |
1414 | ||
1415 | if (!result.new_insn_ptr || !result.new_insn_cnt) { | |
1416 | pr_debug("Skip loading the %dth instance of program '%s'\n", | |
1417 | i, prog->section_name); | |
1418 | prog->instances.fds[i] = -1; | |
1419 | if (result.pfd) | |
1420 | *result.pfd = -1; | |
1421 | continue; | |
1422 | } | |
1423 | ||
d7be143b AI |
1424 | err = load_program(prog->type, prog->expected_attach_type, |
1425 | prog->name, result.new_insn_ptr, | |
b580563e | 1426 | result.new_insn_cnt, |
f0307a7e DB |
1427 | license, kern_version, &fd, |
1428 | prog->prog_ifindex); | |
b580563e WN |
1429 | |
1430 | if (err) { | |
1431 | pr_warning("Loading the %dth instance of program '%s' failed\n", | |
1432 | i, prog->section_name); | |
1433 | goto out; | |
1434 | } | |
1435 | ||
1436 | if (result.pfd) | |
1437 | *result.pfd = fd; | |
1438 | prog->instances.fds[i] = fd; | |
1439 | } | |
1440 | out: | |
55cffde2 WN |
1441 | if (err) |
1442 | pr_warning("failed to load program '%s'\n", | |
1443 | prog->section_name); | |
1444 | zfree(&prog->insns); | |
1445 | prog->insns_cnt = 0; | |
1446 | return err; | |
1447 | } | |
1448 | ||
9a94f277 JK |
1449 | static bool bpf_program__is_function_storage(struct bpf_program *prog, |
1450 | struct bpf_object *obj) | |
1451 | { | |
1452 | return prog->idx == obj->efile.text_shndx && obj->has_pseudo_calls; | |
1453 | } | |
1454 | ||
55cffde2 WN |
1455 | static int |
1456 | bpf_object__load_progs(struct bpf_object *obj) | |
1457 | { | |
1458 | size_t i; | |
1459 | int err; | |
1460 | ||
1461 | for (i = 0; i < obj->nr_programs; i++) { | |
9a94f277 | 1462 | if (bpf_program__is_function_storage(&obj->programs[i], obj)) |
48cca7e4 | 1463 | continue; |
55cffde2 WN |
1464 | err = bpf_program__load(&obj->programs[i], |
1465 | obj->license, | |
1466 | obj->kern_version); | |
1467 | if (err) | |
1468 | return err; | |
1469 | } | |
1470 | return 0; | |
1471 | } | |
1472 | ||
17387dd5 JK |
1473 | static bool bpf_prog_type__needs_kver(enum bpf_prog_type type) |
1474 | { | |
1475 | switch (type) { | |
1476 | case BPF_PROG_TYPE_SOCKET_FILTER: | |
1477 | case BPF_PROG_TYPE_SCHED_CLS: | |
1478 | case BPF_PROG_TYPE_SCHED_ACT: | |
1479 | case BPF_PROG_TYPE_XDP: | |
1480 | case BPF_PROG_TYPE_CGROUP_SKB: | |
1481 | case BPF_PROG_TYPE_CGROUP_SOCK: | |
1482 | case BPF_PROG_TYPE_LWT_IN: | |
1483 | case BPF_PROG_TYPE_LWT_OUT: | |
1484 | case BPF_PROG_TYPE_LWT_XMIT: | |
004d4b27 | 1485 | case BPF_PROG_TYPE_LWT_SEG6LOCAL: |
17387dd5 JK |
1486 | case BPF_PROG_TYPE_SOCK_OPS: |
1487 | case BPF_PROG_TYPE_SK_SKB: | |
1488 | case BPF_PROG_TYPE_CGROUP_DEVICE: | |
1489 | case BPF_PROG_TYPE_SK_MSG: | |
1490 | case BPF_PROG_TYPE_CGROUP_SOCK_ADDR: | |
6bdd533c | 1491 | case BPF_PROG_TYPE_LIRC_MODE2: |
17387dd5 JK |
1492 | return false; |
1493 | case BPF_PROG_TYPE_UNSPEC: | |
1494 | case BPF_PROG_TYPE_KPROBE: | |
1495 | case BPF_PROG_TYPE_TRACEPOINT: | |
1496 | case BPF_PROG_TYPE_PERF_EVENT: | |
1497 | case BPF_PROG_TYPE_RAW_TRACEPOINT: | |
1498 | default: | |
1499 | return true; | |
1500 | } | |
1501 | } | |
1502 | ||
1503 | static int bpf_object__validate(struct bpf_object *obj, bool needs_kver) | |
cb1e5e96 | 1504 | { |
17387dd5 | 1505 | if (needs_kver && obj->kern_version == 0) { |
cb1e5e96 WN |
1506 | pr_warning("%s doesn't provide kernel version\n", |
1507 | obj->path); | |
6371ca3b | 1508 | return -LIBBPF_ERRNO__KVERSION; |
cb1e5e96 WN |
1509 | } |
1510 | return 0; | |
1511 | } | |
1512 | ||
1a5e3fb1 | 1513 | static struct bpf_object * |
17387dd5 JK |
1514 | __bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz, |
1515 | bool needs_kver) | |
1a5e3fb1 WN |
1516 | { |
1517 | struct bpf_object *obj; | |
6371ca3b | 1518 | int err; |
1a5e3fb1 WN |
1519 | |
1520 | if (elf_version(EV_CURRENT) == EV_NONE) { | |
1521 | pr_warning("failed to init libelf for %s\n", path); | |
6371ca3b | 1522 | return ERR_PTR(-LIBBPF_ERRNO__LIBELF); |
1a5e3fb1 WN |
1523 | } |
1524 | ||
6c956392 | 1525 | obj = bpf_object__new(path, obj_buf, obj_buf_sz); |
6371ca3b WN |
1526 | if (IS_ERR(obj)) |
1527 | return obj; | |
1a5e3fb1 | 1528 | |
6371ca3b WN |
1529 | CHECK_ERR(bpf_object__elf_init(obj), err, out); |
1530 | CHECK_ERR(bpf_object__check_endianness(obj), err, out); | |
1531 | CHECK_ERR(bpf_object__elf_collect(obj), err, out); | |
1532 | CHECK_ERR(bpf_object__collect_reloc(obj), err, out); | |
17387dd5 | 1533 | CHECK_ERR(bpf_object__validate(obj, needs_kver), err, out); |
1a5e3fb1 WN |
1534 | |
1535 | bpf_object__elf_finish(obj); | |
1536 | return obj; | |
1537 | out: | |
1538 | bpf_object__close(obj); | |
6371ca3b | 1539 | return ERR_PTR(err); |
1a5e3fb1 WN |
1540 | } |
1541 | ||
07f2d4ea | 1542 | struct bpf_object *bpf_object__open_xattr(struct bpf_object_open_attr *attr) |
1a5e3fb1 WN |
1543 | { |
1544 | /* param validation */ | |
07f2d4ea | 1545 | if (!attr->file) |
1a5e3fb1 WN |
1546 | return NULL; |
1547 | ||
07f2d4ea JK |
1548 | pr_debug("loading %s\n", attr->file); |
1549 | ||
1550 | return __bpf_object__open(attr->file, NULL, 0, | |
1551 | bpf_prog_type__needs_kver(attr->prog_type)); | |
1552 | } | |
1553 | ||
1554 | struct bpf_object *bpf_object__open(const char *path) | |
1555 | { | |
1556 | struct bpf_object_open_attr attr = { | |
1557 | .file = path, | |
1558 | .prog_type = BPF_PROG_TYPE_UNSPEC, | |
1559 | }; | |
1a5e3fb1 | 1560 | |
07f2d4ea | 1561 | return bpf_object__open_xattr(&attr); |
6c956392 WN |
1562 | } |
1563 | ||
1564 | struct bpf_object *bpf_object__open_buffer(void *obj_buf, | |
acf860ae WN |
1565 | size_t obj_buf_sz, |
1566 | const char *name) | |
6c956392 | 1567 | { |
acf860ae WN |
1568 | char tmp_name[64]; |
1569 | ||
6c956392 WN |
1570 | /* param validation */ |
1571 | if (!obj_buf || obj_buf_sz <= 0) | |
1572 | return NULL; | |
1573 | ||
acf860ae WN |
1574 | if (!name) { |
1575 | snprintf(tmp_name, sizeof(tmp_name), "%lx-%lx", | |
1576 | (unsigned long)obj_buf, | |
1577 | (unsigned long)obj_buf_sz); | |
1578 | tmp_name[sizeof(tmp_name) - 1] = '\0'; | |
1579 | name = tmp_name; | |
1580 | } | |
1581 | pr_debug("loading object '%s' from buffer\n", | |
1582 | name); | |
6c956392 | 1583 | |
17387dd5 | 1584 | return __bpf_object__open(name, obj_buf, obj_buf_sz, true); |
1a5e3fb1 WN |
1585 | } |
1586 | ||
52d3352e WN |
1587 | int bpf_object__unload(struct bpf_object *obj) |
1588 | { | |
1589 | size_t i; | |
1590 | ||
1591 | if (!obj) | |
1592 | return -EINVAL; | |
1593 | ||
9d759a9b WN |
1594 | for (i = 0; i < obj->nr_maps; i++) |
1595 | zclose(obj->maps[i].fd); | |
52d3352e | 1596 | |
55cffde2 WN |
1597 | for (i = 0; i < obj->nr_programs; i++) |
1598 | bpf_program__unload(&obj->programs[i]); | |
1599 | ||
52d3352e WN |
1600 | return 0; |
1601 | } | |
1602 | ||
1603 | int bpf_object__load(struct bpf_object *obj) | |
1604 | { | |
6371ca3b WN |
1605 | int err; |
1606 | ||
52d3352e WN |
1607 | if (!obj) |
1608 | return -EINVAL; | |
1609 | ||
1610 | if (obj->loaded) { | |
1611 | pr_warning("object should not be loaded twice\n"); | |
1612 | return -EINVAL; | |
1613 | } | |
1614 | ||
1615 | obj->loaded = true; | |
6371ca3b WN |
1616 | |
1617 | CHECK_ERR(bpf_object__create_maps(obj), err, out); | |
1618 | CHECK_ERR(bpf_object__relocate(obj), err, out); | |
1619 | CHECK_ERR(bpf_object__load_progs(obj), err, out); | |
52d3352e WN |
1620 | |
1621 | return 0; | |
1622 | out: | |
1623 | bpf_object__unload(obj); | |
1624 | pr_warning("failed to load object '%s'\n", obj->path); | |
6371ca3b | 1625 | return err; |
52d3352e WN |
1626 | } |
1627 | ||
f367540c JS |
1628 | static int check_path(const char *path) |
1629 | { | |
1630 | struct statfs st_fs; | |
1631 | char *dname, *dir; | |
1632 | int err = 0; | |
1633 | ||
1634 | if (path == NULL) | |
1635 | return -EINVAL; | |
1636 | ||
1637 | dname = strdup(path); | |
1638 | if (dname == NULL) | |
1639 | return -ENOMEM; | |
1640 | ||
1641 | dir = dirname(dname); | |
1642 | if (statfs(dir, &st_fs)) { | |
1643 | pr_warning("failed to statfs %s: %s\n", dir, strerror(errno)); | |
1644 | err = -errno; | |
1645 | } | |
1646 | free(dname); | |
1647 | ||
1648 | if (!err && st_fs.f_type != BPF_FS_MAGIC) { | |
1649 | pr_warning("specified path %s is not on BPF FS\n", path); | |
1650 | err = -EINVAL; | |
1651 | } | |
1652 | ||
1653 | return err; | |
1654 | } | |
1655 | ||
1656 | int bpf_program__pin_instance(struct bpf_program *prog, const char *path, | |
1657 | int instance) | |
1658 | { | |
1659 | int err; | |
1660 | ||
1661 | err = check_path(path); | |
1662 | if (err) | |
1663 | return err; | |
1664 | ||
1665 | if (prog == NULL) { | |
1666 | pr_warning("invalid program pointer\n"); | |
1667 | return -EINVAL; | |
1668 | } | |
1669 | ||
1670 | if (instance < 0 || instance >= prog->instances.nr) { | |
1671 | pr_warning("invalid prog instance %d of prog %s (max %d)\n", | |
1672 | instance, prog->section_name, prog->instances.nr); | |
1673 | return -EINVAL; | |
1674 | } | |
1675 | ||
1676 | if (bpf_obj_pin(prog->instances.fds[instance], path)) { | |
1677 | pr_warning("failed to pin program: %s\n", strerror(errno)); | |
1678 | return -errno; | |
1679 | } | |
1680 | pr_debug("pinned program '%s'\n", path); | |
1681 | ||
1682 | return 0; | |
1683 | } | |
1684 | ||
1685 | static int make_dir(const char *path) | |
1686 | { | |
1687 | int err = 0; | |
1688 | ||
1689 | if (mkdir(path, 0700) && errno != EEXIST) | |
1690 | err = -errno; | |
1691 | ||
1692 | if (err) | |
1693 | pr_warning("failed to mkdir %s: %s\n", path, strerror(-err)); | |
1694 | return err; | |
1695 | } | |
1696 | ||
1697 | int bpf_program__pin(struct bpf_program *prog, const char *path) | |
1698 | { | |
1699 | int i, err; | |
1700 | ||
1701 | err = check_path(path); | |
1702 | if (err) | |
1703 | return err; | |
1704 | ||
1705 | if (prog == NULL) { | |
1706 | pr_warning("invalid program pointer\n"); | |
1707 | return -EINVAL; | |
1708 | } | |
1709 | ||
1710 | if (prog->instances.nr <= 0) { | |
1711 | pr_warning("no instances of prog %s to pin\n", | |
1712 | prog->section_name); | |
1713 | return -EINVAL; | |
1714 | } | |
1715 | ||
1716 | err = make_dir(path); | |
1717 | if (err) | |
1718 | return err; | |
1719 | ||
1720 | for (i = 0; i < prog->instances.nr; i++) { | |
1721 | char buf[PATH_MAX]; | |
1722 | int len; | |
1723 | ||
1724 | len = snprintf(buf, PATH_MAX, "%s/%d", path, i); | |
1725 | if (len < 0) | |
1726 | return -EINVAL; | |
1727 | else if (len >= PATH_MAX) | |
1728 | return -ENAMETOOLONG; | |
1729 | ||
1730 | err = bpf_program__pin_instance(prog, buf, i); | |
1731 | if (err) | |
1732 | return err; | |
1733 | } | |
1734 | ||
1735 | return 0; | |
1736 | } | |
1737 | ||
b6989f35 JS |
1738 | int bpf_map__pin(struct bpf_map *map, const char *path) |
1739 | { | |
1740 | int err; | |
1741 | ||
1742 | err = check_path(path); | |
1743 | if (err) | |
1744 | return err; | |
1745 | ||
1746 | if (map == NULL) { | |
1747 | pr_warning("invalid map pointer\n"); | |
1748 | return -EINVAL; | |
1749 | } | |
1750 | ||
1751 | if (bpf_obj_pin(map->fd, path)) { | |
1752 | pr_warning("failed to pin map: %s\n", strerror(errno)); | |
1753 | return -errno; | |
1754 | } | |
1755 | ||
1756 | pr_debug("pinned map '%s'\n", path); | |
1757 | return 0; | |
1758 | } | |
1759 | ||
d5148d85 JS |
1760 | int bpf_object__pin(struct bpf_object *obj, const char *path) |
1761 | { | |
1762 | struct bpf_program *prog; | |
1763 | struct bpf_map *map; | |
1764 | int err; | |
1765 | ||
1766 | if (!obj) | |
1767 | return -ENOENT; | |
1768 | ||
1769 | if (!obj->loaded) { | |
1770 | pr_warning("object not yet loaded; load it first\n"); | |
1771 | return -ENOENT; | |
1772 | } | |
1773 | ||
1774 | err = make_dir(path); | |
1775 | if (err) | |
1776 | return err; | |
1777 | ||
1778 | bpf_map__for_each(map, obj) { | |
1779 | char buf[PATH_MAX]; | |
1780 | int len; | |
1781 | ||
1782 | len = snprintf(buf, PATH_MAX, "%s/%s", path, | |
1783 | bpf_map__name(map)); | |
1784 | if (len < 0) | |
1785 | return -EINVAL; | |
1786 | else if (len >= PATH_MAX) | |
1787 | return -ENAMETOOLONG; | |
1788 | ||
1789 | err = bpf_map__pin(map, buf); | |
1790 | if (err) | |
1791 | return err; | |
1792 | } | |
1793 | ||
1794 | bpf_object__for_each_program(prog, obj) { | |
1795 | char buf[PATH_MAX]; | |
1796 | int len; | |
1797 | ||
1798 | len = snprintf(buf, PATH_MAX, "%s/%s", path, | |
1799 | prog->section_name); | |
1800 | if (len < 0) | |
1801 | return -EINVAL; | |
1802 | else if (len >= PATH_MAX) | |
1803 | return -ENAMETOOLONG; | |
1804 | ||
1805 | err = bpf_program__pin(prog, buf); | |
1806 | if (err) | |
1807 | return err; | |
1808 | } | |
1809 | ||
1810 | return 0; | |
1811 | } | |
1812 | ||
1a5e3fb1 WN |
1813 | void bpf_object__close(struct bpf_object *obj) |
1814 | { | |
a5b8bd47 WN |
1815 | size_t i; |
1816 | ||
1a5e3fb1 WN |
1817 | if (!obj) |
1818 | return; | |
1819 | ||
10931d24 WN |
1820 | if (obj->clear_priv) |
1821 | obj->clear_priv(obj, obj->priv); | |
1822 | ||
1a5e3fb1 | 1823 | bpf_object__elf_finish(obj); |
52d3352e | 1824 | bpf_object__unload(obj); |
8a138aed | 1825 | btf__free(obj->btf); |
1a5e3fb1 | 1826 | |
9d759a9b | 1827 | for (i = 0; i < obj->nr_maps; i++) { |
561bbcca | 1828 | zfree(&obj->maps[i].name); |
9d759a9b WN |
1829 | if (obj->maps[i].clear_priv) |
1830 | obj->maps[i].clear_priv(&obj->maps[i], | |
1831 | obj->maps[i].priv); | |
1832 | obj->maps[i].priv = NULL; | |
1833 | obj->maps[i].clear_priv = NULL; | |
1834 | } | |
1835 | zfree(&obj->maps); | |
1836 | obj->nr_maps = 0; | |
a5b8bd47 WN |
1837 | |
1838 | if (obj->programs && obj->nr_programs) { | |
1839 | for (i = 0; i < obj->nr_programs; i++) | |
1840 | bpf_program__exit(&obj->programs[i]); | |
1841 | } | |
1842 | zfree(&obj->programs); | |
1843 | ||
9a208eff | 1844 | list_del(&obj->list); |
1a5e3fb1 WN |
1845 | free(obj); |
1846 | } | |
aa9b1ac3 | 1847 | |
9a208eff WN |
1848 | struct bpf_object * |
1849 | bpf_object__next(struct bpf_object *prev) | |
1850 | { | |
1851 | struct bpf_object *next; | |
1852 | ||
1853 | if (!prev) | |
1854 | next = list_first_entry(&bpf_objects_list, | |
1855 | struct bpf_object, | |
1856 | list); | |
1857 | else | |
1858 | next = list_next_entry(prev, list); | |
1859 | ||
1860 | /* Empty list is noticed here so don't need checking on entry. */ | |
1861 | if (&next->list == &bpf_objects_list) | |
1862 | return NULL; | |
1863 | ||
1864 | return next; | |
1865 | } | |
1866 | ||
a7fe0450 | 1867 | const char *bpf_object__name(struct bpf_object *obj) |
acf860ae | 1868 | { |
a7fe0450 | 1869 | return obj ? obj->path : ERR_PTR(-EINVAL); |
acf860ae WN |
1870 | } |
1871 | ||
a7fe0450 | 1872 | unsigned int bpf_object__kversion(struct bpf_object *obj) |
45825d8a | 1873 | { |
a7fe0450 | 1874 | return obj ? obj->kern_version : 0; |
45825d8a WN |
1875 | } |
1876 | ||
8a138aed MKL |
1877 | int bpf_object__btf_fd(const struct bpf_object *obj) |
1878 | { | |
1879 | return obj->btf ? btf__fd(obj->btf) : -1; | |
1880 | } | |
1881 | ||
10931d24 WN |
1882 | int bpf_object__set_priv(struct bpf_object *obj, void *priv, |
1883 | bpf_object_clear_priv_t clear_priv) | |
1884 | { | |
1885 | if (obj->priv && obj->clear_priv) | |
1886 | obj->clear_priv(obj, obj->priv); | |
1887 | ||
1888 | obj->priv = priv; | |
1889 | obj->clear_priv = clear_priv; | |
1890 | return 0; | |
1891 | } | |
1892 | ||
1893 | void *bpf_object__priv(struct bpf_object *obj) | |
1894 | { | |
1895 | return obj ? obj->priv : ERR_PTR(-EINVAL); | |
1896 | } | |
1897 | ||
eac7d845 JK |
1898 | static struct bpf_program * |
1899 | __bpf_program__next(struct bpf_program *prev, struct bpf_object *obj) | |
aa9b1ac3 WN |
1900 | { |
1901 | size_t idx; | |
1902 | ||
1903 | if (!obj->programs) | |
1904 | return NULL; | |
1905 | /* First handler */ | |
1906 | if (prev == NULL) | |
1907 | return &obj->programs[0]; | |
1908 | ||
1909 | if (prev->obj != obj) { | |
1910 | pr_warning("error: program handler doesn't match object\n"); | |
1911 | return NULL; | |
1912 | } | |
1913 | ||
1914 | idx = (prev - obj->programs) + 1; | |
1915 | if (idx >= obj->nr_programs) | |
1916 | return NULL; | |
1917 | return &obj->programs[idx]; | |
1918 | } | |
1919 | ||
eac7d845 JK |
1920 | struct bpf_program * |
1921 | bpf_program__next(struct bpf_program *prev, struct bpf_object *obj) | |
1922 | { | |
1923 | struct bpf_program *prog = prev; | |
1924 | ||
1925 | do { | |
1926 | prog = __bpf_program__next(prog, obj); | |
1927 | } while (prog && bpf_program__is_function_storage(prog, obj)); | |
1928 | ||
1929 | return prog; | |
1930 | } | |
1931 | ||
edb13ed4 ACM |
1932 | int bpf_program__set_priv(struct bpf_program *prog, void *priv, |
1933 | bpf_program_clear_priv_t clear_priv) | |
aa9b1ac3 WN |
1934 | { |
1935 | if (prog->priv && prog->clear_priv) | |
1936 | prog->clear_priv(prog, prog->priv); | |
1937 | ||
1938 | prog->priv = priv; | |
1939 | prog->clear_priv = clear_priv; | |
1940 | return 0; | |
1941 | } | |
1942 | ||
be834ffb | 1943 | void *bpf_program__priv(struct bpf_program *prog) |
aa9b1ac3 | 1944 | { |
be834ffb | 1945 | return prog ? prog->priv : ERR_PTR(-EINVAL); |
aa9b1ac3 WN |
1946 | } |
1947 | ||
9aba3613 JK |
1948 | void bpf_program__set_ifindex(struct bpf_program *prog, __u32 ifindex) |
1949 | { | |
1950 | prog->prog_ifindex = ifindex; | |
1951 | } | |
1952 | ||
715f8db9 | 1953 | const char *bpf_program__title(struct bpf_program *prog, bool needs_copy) |
aa9b1ac3 WN |
1954 | { |
1955 | const char *title; | |
1956 | ||
1957 | title = prog->section_name; | |
715f8db9 | 1958 | if (needs_copy) { |
aa9b1ac3 WN |
1959 | title = strdup(title); |
1960 | if (!title) { | |
1961 | pr_warning("failed to strdup program title\n"); | |
6371ca3b | 1962 | return ERR_PTR(-ENOMEM); |
aa9b1ac3 WN |
1963 | } |
1964 | } | |
1965 | ||
1966 | return title; | |
1967 | } | |
1968 | ||
1969 | int bpf_program__fd(struct bpf_program *prog) | |
1970 | { | |
b580563e WN |
1971 | return bpf_program__nth_fd(prog, 0); |
1972 | } | |
1973 | ||
1974 | int bpf_program__set_prep(struct bpf_program *prog, int nr_instances, | |
1975 | bpf_program_prep_t prep) | |
1976 | { | |
1977 | int *instances_fds; | |
1978 | ||
1979 | if (nr_instances <= 0 || !prep) | |
1980 | return -EINVAL; | |
1981 | ||
1982 | if (prog->instances.nr > 0 || prog->instances.fds) { | |
1983 | pr_warning("Can't set pre-processor after loading\n"); | |
1984 | return -EINVAL; | |
1985 | } | |
1986 | ||
1987 | instances_fds = malloc(sizeof(int) * nr_instances); | |
1988 | if (!instances_fds) { | |
1989 | pr_warning("alloc memory failed for fds\n"); | |
1990 | return -ENOMEM; | |
1991 | } | |
1992 | ||
1993 | /* fill all fd with -1 */ | |
1994 | memset(instances_fds, -1, sizeof(int) * nr_instances); | |
1995 | ||
1996 | prog->instances.nr = nr_instances; | |
1997 | prog->instances.fds = instances_fds; | |
1998 | prog->preprocessor = prep; | |
1999 | return 0; | |
2000 | } | |
2001 | ||
2002 | int bpf_program__nth_fd(struct bpf_program *prog, int n) | |
2003 | { | |
2004 | int fd; | |
2005 | ||
1e960043 JK |
2006 | if (!prog) |
2007 | return -EINVAL; | |
2008 | ||
b580563e WN |
2009 | if (n >= prog->instances.nr || n < 0) { |
2010 | pr_warning("Can't get the %dth fd from program %s: only %d instances\n", | |
2011 | n, prog->section_name, prog->instances.nr); | |
2012 | return -EINVAL; | |
2013 | } | |
2014 | ||
2015 | fd = prog->instances.fds[n]; | |
2016 | if (fd < 0) { | |
2017 | pr_warning("%dth instance of program '%s' is invalid\n", | |
2018 | n, prog->section_name); | |
2019 | return -ENOENT; | |
2020 | } | |
2021 | ||
2022 | return fd; | |
aa9b1ac3 | 2023 | } |
9d759a9b | 2024 | |
dd26b7f5 | 2025 | void bpf_program__set_type(struct bpf_program *prog, enum bpf_prog_type type) |
5f44e4c8 WN |
2026 | { |
2027 | prog->type = type; | |
2028 | } | |
2029 | ||
5f44e4c8 WN |
2030 | static bool bpf_program__is_type(struct bpf_program *prog, |
2031 | enum bpf_prog_type type) | |
2032 | { | |
2033 | return prog ? (prog->type == type) : false; | |
2034 | } | |
2035 | ||
ed794073 JS |
2036 | #define BPF_PROG_TYPE_FNS(NAME, TYPE) \ |
2037 | int bpf_program__set_##NAME(struct bpf_program *prog) \ | |
2038 | { \ | |
2039 | if (!prog) \ | |
2040 | return -EINVAL; \ | |
2041 | bpf_program__set_type(prog, TYPE); \ | |
2042 | return 0; \ | |
2043 | } \ | |
2044 | \ | |
2045 | bool bpf_program__is_##NAME(struct bpf_program *prog) \ | |
2046 | { \ | |
2047 | return bpf_program__is_type(prog, TYPE); \ | |
2048 | } \ | |
2049 | ||
7803ba73 | 2050 | BPF_PROG_TYPE_FNS(socket_filter, BPF_PROG_TYPE_SOCKET_FILTER); |
ed794073 | 2051 | BPF_PROG_TYPE_FNS(kprobe, BPF_PROG_TYPE_KPROBE); |
7803ba73 JS |
2052 | BPF_PROG_TYPE_FNS(sched_cls, BPF_PROG_TYPE_SCHED_CLS); |
2053 | BPF_PROG_TYPE_FNS(sched_act, BPF_PROG_TYPE_SCHED_ACT); | |
ed794073 | 2054 | BPF_PROG_TYPE_FNS(tracepoint, BPF_PROG_TYPE_TRACEPOINT); |
e14c93fd | 2055 | BPF_PROG_TYPE_FNS(raw_tracepoint, BPF_PROG_TYPE_RAW_TRACEPOINT); |
7803ba73 JS |
2056 | BPF_PROG_TYPE_FNS(xdp, BPF_PROG_TYPE_XDP); |
2057 | BPF_PROG_TYPE_FNS(perf_event, BPF_PROG_TYPE_PERF_EVENT); | |
5f44e4c8 | 2058 | |
16962b24 JF |
2059 | void bpf_program__set_expected_attach_type(struct bpf_program *prog, |
2060 | enum bpf_attach_type type) | |
d7be143b AI |
2061 | { |
2062 | prog->expected_attach_type = type; | |
2063 | } | |
2064 | ||
2065 | #define BPF_PROG_SEC_FULL(string, ptype, atype) \ | |
2066 | { string, sizeof(string) - 1, ptype, atype } | |
2067 | ||
2068 | #define BPF_PROG_SEC(string, ptype) BPF_PROG_SEC_FULL(string, ptype, 0) | |
2069 | ||
81efee75 AI |
2070 | #define BPF_S_PROG_SEC(string, ptype) \ |
2071 | BPF_PROG_SEC_FULL(string, BPF_PROG_TYPE_CGROUP_SOCK, ptype) | |
2072 | ||
e50b0a6f AI |
2073 | #define BPF_SA_PROG_SEC(string, ptype) \ |
2074 | BPF_PROG_SEC_FULL(string, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, ptype) | |
2075 | ||
583c9009 RG |
2076 | static const struct { |
2077 | const char *sec; | |
2078 | size_t len; | |
2079 | enum bpf_prog_type prog_type; | |
d7be143b | 2080 | enum bpf_attach_type expected_attach_type; |
583c9009 RG |
2081 | } section_names[] = { |
2082 | BPF_PROG_SEC("socket", BPF_PROG_TYPE_SOCKET_FILTER), | |
2083 | BPF_PROG_SEC("kprobe/", BPF_PROG_TYPE_KPROBE), | |
2084 | BPF_PROG_SEC("kretprobe/", BPF_PROG_TYPE_KPROBE), | |
0badd331 QM |
2085 | BPF_PROG_SEC("classifier", BPF_PROG_TYPE_SCHED_CLS), |
2086 | BPF_PROG_SEC("action", BPF_PROG_TYPE_SCHED_ACT), | |
583c9009 | 2087 | BPF_PROG_SEC("tracepoint/", BPF_PROG_TYPE_TRACEPOINT), |
e14c93fd | 2088 | BPF_PROG_SEC("raw_tracepoint/", BPF_PROG_TYPE_RAW_TRACEPOINT), |
583c9009 RG |
2089 | BPF_PROG_SEC("xdp", BPF_PROG_TYPE_XDP), |
2090 | BPF_PROG_SEC("perf_event", BPF_PROG_TYPE_PERF_EVENT), | |
2091 | BPF_PROG_SEC("cgroup/skb", BPF_PROG_TYPE_CGROUP_SKB), | |
2092 | BPF_PROG_SEC("cgroup/sock", BPF_PROG_TYPE_CGROUP_SOCK), | |
2093 | BPF_PROG_SEC("cgroup/dev", BPF_PROG_TYPE_CGROUP_DEVICE), | |
0badd331 QM |
2094 | BPF_PROG_SEC("lwt_in", BPF_PROG_TYPE_LWT_IN), |
2095 | BPF_PROG_SEC("lwt_out", BPF_PROG_TYPE_LWT_OUT), | |
2096 | BPF_PROG_SEC("lwt_xmit", BPF_PROG_TYPE_LWT_XMIT), | |
d9b683d7 | 2097 | BPF_PROG_SEC("lwt_seg6local", BPF_PROG_TYPE_LWT_SEG6LOCAL), |
583c9009 RG |
2098 | BPF_PROG_SEC("sockops", BPF_PROG_TYPE_SOCK_OPS), |
2099 | BPF_PROG_SEC("sk_skb", BPF_PROG_TYPE_SK_SKB), | |
4c4c3c27 | 2100 | BPF_PROG_SEC("sk_msg", BPF_PROG_TYPE_SK_MSG), |
d9b683d7 | 2101 | BPF_PROG_SEC("lirc_mode2", BPF_PROG_TYPE_LIRC_MODE2), |
e50b0a6f AI |
2102 | BPF_SA_PROG_SEC("cgroup/bind4", BPF_CGROUP_INET4_BIND), |
2103 | BPF_SA_PROG_SEC("cgroup/bind6", BPF_CGROUP_INET6_BIND), | |
622adafb AI |
2104 | BPF_SA_PROG_SEC("cgroup/connect4", BPF_CGROUP_INET4_CONNECT), |
2105 | BPF_SA_PROG_SEC("cgroup/connect6", BPF_CGROUP_INET6_CONNECT), | |
72481f39 AI |
2106 | BPF_SA_PROG_SEC("cgroup/sendmsg4", BPF_CGROUP_UDP4_SENDMSG), |
2107 | BPF_SA_PROG_SEC("cgroup/sendmsg6", BPF_CGROUP_UDP6_SENDMSG), | |
81efee75 AI |
2108 | BPF_S_PROG_SEC("cgroup/post_bind4", BPF_CGROUP_INET4_POST_BIND), |
2109 | BPF_S_PROG_SEC("cgroup/post_bind6", BPF_CGROUP_INET6_POST_BIND), | |
583c9009 | 2110 | }; |
d7be143b | 2111 | |
583c9009 | 2112 | #undef BPF_PROG_SEC |
d7be143b | 2113 | #undef BPF_PROG_SEC_FULL |
81efee75 | 2114 | #undef BPF_S_PROG_SEC |
e50b0a6f | 2115 | #undef BPF_SA_PROG_SEC |
583c9009 | 2116 | |
b60df2a0 JK |
2117 | int libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type, |
2118 | enum bpf_attach_type *expected_attach_type) | |
583c9009 RG |
2119 | { |
2120 | int i; | |
2121 | ||
b60df2a0 JK |
2122 | if (!name) |
2123 | return -EINVAL; | |
583c9009 | 2124 | |
b60df2a0 JK |
2125 | for (i = 0; i < ARRAY_SIZE(section_names); i++) { |
2126 | if (strncmp(name, section_names[i].sec, section_names[i].len)) | |
2127 | continue; | |
2128 | *prog_type = section_names[i].prog_type; | |
2129 | *expected_attach_type = section_names[i].expected_attach_type; | |
2130 | return 0; | |
2131 | } | |
2132 | return -EINVAL; | |
2133 | } | |
583c9009 | 2134 | |
b60df2a0 JK |
2135 | static int |
2136 | bpf_program__identify_section(struct bpf_program *prog, | |
2137 | enum bpf_prog_type *prog_type, | |
2138 | enum bpf_attach_type *expected_attach_type) | |
2139 | { | |
2140 | return libbpf_prog_type_by_name(prog->section_name, prog_type, | |
2141 | expected_attach_type); | |
583c9009 RG |
2142 | } |
2143 | ||
6e009e65 | 2144 | int bpf_map__fd(struct bpf_map *map) |
9d759a9b | 2145 | { |
6e009e65 | 2146 | return map ? map->fd : -EINVAL; |
9d759a9b WN |
2147 | } |
2148 | ||
53897a78 | 2149 | const struct bpf_map_def *bpf_map__def(struct bpf_map *map) |
9d759a9b | 2150 | { |
53897a78 | 2151 | return map ? &map->def : ERR_PTR(-EINVAL); |
9d759a9b WN |
2152 | } |
2153 | ||
009ad5d5 | 2154 | const char *bpf_map__name(struct bpf_map *map) |
561bbcca | 2155 | { |
009ad5d5 | 2156 | return map ? map->name : NULL; |
561bbcca WN |
2157 | } |
2158 | ||
61746dbe | 2159 | uint32_t bpf_map__btf_key_type_id(const struct bpf_map *map) |
8a138aed | 2160 | { |
61746dbe | 2161 | return map ? map->btf_key_type_id : 0; |
8a138aed MKL |
2162 | } |
2163 | ||
61746dbe | 2164 | uint32_t bpf_map__btf_value_type_id(const struct bpf_map *map) |
8a138aed | 2165 | { |
61746dbe | 2166 | return map ? map->btf_value_type_id : 0; |
8a138aed MKL |
2167 | } |
2168 | ||
edb13ed4 ACM |
2169 | int bpf_map__set_priv(struct bpf_map *map, void *priv, |
2170 | bpf_map_clear_priv_t clear_priv) | |
9d759a9b WN |
2171 | { |
2172 | if (!map) | |
2173 | return -EINVAL; | |
2174 | ||
2175 | if (map->priv) { | |
2176 | if (map->clear_priv) | |
2177 | map->clear_priv(map, map->priv); | |
2178 | } | |
2179 | ||
2180 | map->priv = priv; | |
2181 | map->clear_priv = clear_priv; | |
2182 | return 0; | |
2183 | } | |
2184 | ||
b4cbfa56 | 2185 | void *bpf_map__priv(struct bpf_map *map) |
9d759a9b | 2186 | { |
b4cbfa56 | 2187 | return map ? map->priv : ERR_PTR(-EINVAL); |
9d759a9b WN |
2188 | } |
2189 | ||
f83fb22c JK |
2190 | bool bpf_map__is_offload_neutral(struct bpf_map *map) |
2191 | { | |
2192 | return map->def.type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; | |
2193 | } | |
2194 | ||
9aba3613 JK |
2195 | void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex) |
2196 | { | |
2197 | map->map_ifindex = ifindex; | |
2198 | } | |
2199 | ||
9d759a9b WN |
2200 | struct bpf_map * |
2201 | bpf_map__next(struct bpf_map *prev, struct bpf_object *obj) | |
2202 | { | |
2203 | size_t idx; | |
2204 | struct bpf_map *s, *e; | |
2205 | ||
2206 | if (!obj || !obj->maps) | |
2207 | return NULL; | |
2208 | ||
2209 | s = obj->maps; | |
2210 | e = obj->maps + obj->nr_maps; | |
2211 | ||
2212 | if (prev == NULL) | |
2213 | return s; | |
2214 | ||
2215 | if ((prev < s) || (prev >= e)) { | |
2216 | pr_warning("error in %s: map handler doesn't belong to object\n", | |
2217 | __func__); | |
2218 | return NULL; | |
2219 | } | |
2220 | ||
2221 | idx = (prev - obj->maps) + 1; | |
2222 | if (idx >= obj->nr_maps) | |
2223 | return NULL; | |
2224 | return &obj->maps[idx]; | |
2225 | } | |
561bbcca WN |
2226 | |
2227 | struct bpf_map * | |
a7fe0450 | 2228 | bpf_object__find_map_by_name(struct bpf_object *obj, const char *name) |
561bbcca WN |
2229 | { |
2230 | struct bpf_map *pos; | |
2231 | ||
2232 | bpf_map__for_each(pos, obj) { | |
973170e6 | 2233 | if (pos->name && !strcmp(pos->name, name)) |
561bbcca WN |
2234 | return pos; |
2235 | } | |
2236 | return NULL; | |
2237 | } | |
5a6acad1 WN |
2238 | |
2239 | struct bpf_map * | |
2240 | bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset) | |
2241 | { | |
2242 | int i; | |
2243 | ||
2244 | for (i = 0; i < obj->nr_maps; i++) { | |
2245 | if (obj->maps[i].offset == offset) | |
2246 | return &obj->maps[i]; | |
2247 | } | |
2248 | return ERR_PTR(-ENOENT); | |
2249 | } | |
e28ff1a8 JS |
2250 | |
2251 | long libbpf_get_error(const void *ptr) | |
2252 | { | |
2253 | if (IS_ERR(ptr)) | |
2254 | return PTR_ERR(ptr); | |
2255 | return 0; | |
2256 | } | |
6f6d33f3 JF |
2257 | |
2258 | int bpf_prog_load(const char *file, enum bpf_prog_type type, | |
2259 | struct bpf_object **pobj, int *prog_fd) | |
d7be143b AI |
2260 | { |
2261 | struct bpf_prog_load_attr attr; | |
2262 | ||
2263 | memset(&attr, 0, sizeof(struct bpf_prog_load_attr)); | |
2264 | attr.file = file; | |
2265 | attr.prog_type = type; | |
2266 | attr.expected_attach_type = 0; | |
2267 | ||
2268 | return bpf_prog_load_xattr(&attr, pobj, prog_fd); | |
2269 | } | |
2270 | ||
2271 | int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr, | |
2272 | struct bpf_object **pobj, int *prog_fd) | |
6f6d33f3 | 2273 | { |
07f2d4ea JK |
2274 | struct bpf_object_open_attr open_attr = { |
2275 | .file = attr->file, | |
2276 | .prog_type = attr->prog_type, | |
2277 | }; | |
48cca7e4 | 2278 | struct bpf_program *prog, *first_prog = NULL; |
d7be143b AI |
2279 | enum bpf_attach_type expected_attach_type; |
2280 | enum bpf_prog_type prog_type; | |
6f6d33f3 | 2281 | struct bpf_object *obj; |
f0307a7e | 2282 | struct bpf_map *map; |
6f6d33f3 JF |
2283 | int err; |
2284 | ||
d7be143b AI |
2285 | if (!attr) |
2286 | return -EINVAL; | |
17387dd5 JK |
2287 | if (!attr->file) |
2288 | return -EINVAL; | |
d7be143b | 2289 | |
07f2d4ea | 2290 | obj = bpf_object__open_xattr(&open_attr); |
3597683c | 2291 | if (IS_ERR_OR_NULL(obj)) |
6f6d33f3 JF |
2292 | return -ENOENT; |
2293 | ||
48cca7e4 AS |
2294 | bpf_object__for_each_program(prog, obj) { |
2295 | /* | |
2296 | * If type is not specified, try to guess it based on | |
2297 | * section name. | |
2298 | */ | |
d7be143b | 2299 | prog_type = attr->prog_type; |
f0307a7e | 2300 | prog->prog_ifindex = attr->ifindex; |
d7be143b AI |
2301 | expected_attach_type = attr->expected_attach_type; |
2302 | if (prog_type == BPF_PROG_TYPE_UNSPEC) { | |
b60df2a0 JK |
2303 | err = bpf_program__identify_section(prog, &prog_type, |
2304 | &expected_attach_type); | |
2305 | if (err < 0) { | |
2306 | pr_warning("failed to guess program type based on section name %s\n", | |
2307 | prog->section_name); | |
48cca7e4 AS |
2308 | bpf_object__close(obj); |
2309 | return -EINVAL; | |
2310 | } | |
583c9009 | 2311 | } |
48cca7e4 | 2312 | |
d7be143b AI |
2313 | bpf_program__set_type(prog, prog_type); |
2314 | bpf_program__set_expected_attach_type(prog, | |
2315 | expected_attach_type); | |
2316 | ||
9a94f277 | 2317 | if (!bpf_program__is_function_storage(prog, obj) && !first_prog) |
48cca7e4 AS |
2318 | first_prog = prog; |
2319 | } | |
2320 | ||
f0307a7e | 2321 | bpf_map__for_each(map, obj) { |
f83fb22c JK |
2322 | if (!bpf_map__is_offload_neutral(map)) |
2323 | map->map_ifindex = attr->ifindex; | |
f0307a7e DB |
2324 | } |
2325 | ||
48cca7e4 AS |
2326 | if (!first_prog) { |
2327 | pr_warning("object file doesn't contain bpf program\n"); | |
2328 | bpf_object__close(obj); | |
2329 | return -ENOENT; | |
583c9009 RG |
2330 | } |
2331 | ||
6f6d33f3 JF |
2332 | err = bpf_object__load(obj); |
2333 | if (err) { | |
2334 | bpf_object__close(obj); | |
2335 | return -EINVAL; | |
2336 | } | |
2337 | ||
2338 | *pobj = obj; | |
48cca7e4 | 2339 | *prog_fd = bpf_program__fd(first_prog); |
6f6d33f3 JF |
2340 | return 0; |
2341 | } | |
d0cabbb0 JK |
2342 | |
2343 | enum bpf_perf_event_ret | |
2344 | bpf_perf_event_read_simple(void *mem, unsigned long size, | |
2345 | unsigned long page_size, void **buf, size_t *buf_len, | |
2346 | bpf_perf_event_print_t fn, void *priv) | |
2347 | { | |
2348 | volatile struct perf_event_mmap_page *header = mem; | |
2349 | __u64 data_tail = header->data_tail; | |
2350 | __u64 data_head = header->data_head; | |
2351 | void *base, *begin, *end; | |
2352 | int ret; | |
2353 | ||
2354 | asm volatile("" ::: "memory"); /* in real code it should be smp_rmb() */ | |
2355 | if (data_head == data_tail) | |
2356 | return LIBBPF_PERF_EVENT_CONT; | |
2357 | ||
2358 | base = ((char *)header) + page_size; | |
2359 | ||
2360 | begin = base + data_tail % size; | |
2361 | end = base + data_head % size; | |
2362 | ||
2363 | while (begin != end) { | |
2364 | struct perf_event_header *ehdr; | |
2365 | ||
2366 | ehdr = begin; | |
2367 | if (begin + ehdr->size > base + size) { | |
2368 | long len = base + size - begin; | |
2369 | ||
2370 | if (*buf_len < ehdr->size) { | |
2371 | free(*buf); | |
2372 | *buf = malloc(ehdr->size); | |
2373 | if (!*buf) { | |
2374 | ret = LIBBPF_PERF_EVENT_ERROR; | |
2375 | break; | |
2376 | } | |
2377 | *buf_len = ehdr->size; | |
2378 | } | |
2379 | ||
2380 | memcpy(*buf, begin, len); | |
2381 | memcpy(*buf + len, base, ehdr->size - len); | |
2382 | ehdr = (void *)*buf; | |
2383 | begin = base + ehdr->size - len; | |
2384 | } else if (begin + ehdr->size == base + size) { | |
2385 | begin = base; | |
2386 | } else { | |
2387 | begin += ehdr->size; | |
2388 | } | |
2389 | ||
2390 | ret = fn(ehdr, priv); | |
2391 | if (ret != LIBBPF_PERF_EVENT_CONT) | |
2392 | break; | |
2393 | ||
2394 | data_tail += ehdr->size; | |
2395 | } | |
2396 | ||
2397 | __sync_synchronize(); /* smp_mb() */ | |
2398 | header->data_tail = data_tail; | |
2399 | ||
2400 | return ret; | |
2401 | } |