Commit | Line | Data |
---|---|---|
1b76c13e WN |
1 | /* |
2 | * Common eBPF ELF object loading operations. | |
3 | * | |
4 | * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org> | |
5 | * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com> | |
6 | * Copyright (C) 2015 Huawei Inc. | |
7 | */ | |
8 | ||
9 | #include <stdlib.h> | |
b3f59d66 WN |
10 | #include <stdio.h> |
11 | #include <stdarg.h> | |
34090915 | 12 | #include <inttypes.h> |
b3f59d66 | 13 | #include <string.h> |
1b76c13e | 14 | #include <unistd.h> |
1a5e3fb1 WN |
15 | #include <fcntl.h> |
16 | #include <errno.h> | |
1b76c13e | 17 | #include <asm/unistd.h> |
cb1e5e96 | 18 | #include <linux/kernel.h> |
1b76c13e | 19 | #include <linux/bpf.h> |
9a208eff | 20 | #include <linux/list.h> |
1a5e3fb1 WN |
21 | #include <libelf.h> |
22 | #include <gelf.h> | |
1b76c13e WN |
23 | |
24 | #include "libbpf.h" | |
52d3352e | 25 | #include "bpf.h" |
b3f59d66 WN |
26 | |
27 | #define __printf(a, b) __attribute__((format(printf, a, b))) | |
28 | ||
29 | __printf(1, 2) | |
30 | static int __base_pr(const char *format, ...) | |
31 | { | |
32 | va_list args; | |
33 | int err; | |
34 | ||
35 | va_start(args, format); | |
36 | err = vfprintf(stderr, format, args); | |
37 | va_end(args); | |
38 | return err; | |
39 | } | |
40 | ||
41 | static __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr; | |
42 | static __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr; | |
43 | static __printf(1, 2) libbpf_print_fn_t __pr_debug; | |
44 | ||
45 | #define __pr(func, fmt, ...) \ | |
46 | do { \ | |
47 | if ((func)) \ | |
48 | (func)("libbpf: " fmt, ##__VA_ARGS__); \ | |
49 | } while (0) | |
50 | ||
51 | #define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__) | |
52 | #define pr_info(fmt, ...) __pr(__pr_info, fmt, ##__VA_ARGS__) | |
53 | #define pr_debug(fmt, ...) __pr(__pr_debug, fmt, ##__VA_ARGS__) | |
54 | ||
55 | void libbpf_set_print(libbpf_print_fn_t warn, | |
56 | libbpf_print_fn_t info, | |
57 | libbpf_print_fn_t debug) | |
58 | { | |
59 | __pr_warning = warn; | |
60 | __pr_info = info; | |
61 | __pr_debug = debug; | |
62 | } | |
1a5e3fb1 | 63 | |
6371ca3b WN |
64 | #define STRERR_BUFSIZE 128 |
65 | ||
66 | #define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START) | |
67 | #define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c) | |
68 | #define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START) | |
69 | ||
70 | static const char *libbpf_strerror_table[NR_ERRNO] = { | |
71 | [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf", | |
72 | [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid", | |
73 | [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost", | |
74 | [ERRCODE_OFFSET(ENDIAN)] = "Endian missmatch", | |
75 | [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf", | |
76 | [ERRCODE_OFFSET(RELOC)] = "Relocation failed", | |
77 | [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading", | |
78 | [ERRCODE_OFFSET(PROG2BIG)] = "Program too big", | |
79 | [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version", | |
80 | }; | |
81 | ||
82 | int libbpf_strerror(int err, char *buf, size_t size) | |
83 | { | |
84 | if (!buf || !size) | |
85 | return -1; | |
86 | ||
87 | err = err > 0 ? err : -err; | |
88 | ||
89 | if (err < __LIBBPF_ERRNO__START) { | |
90 | int ret; | |
91 | ||
92 | ret = strerror_r(err, buf, size); | |
93 | buf[size - 1] = '\0'; | |
94 | return ret; | |
95 | } | |
96 | ||
97 | if (err < __LIBBPF_ERRNO__END) { | |
98 | const char *msg; | |
99 | ||
100 | msg = libbpf_strerror_table[ERRNO_OFFSET(err)]; | |
101 | snprintf(buf, size, "%s", msg); | |
102 | buf[size - 1] = '\0'; | |
103 | return 0; | |
104 | } | |
105 | ||
106 | snprintf(buf, size, "Unknown libbpf error %d", err); | |
107 | buf[size - 1] = '\0'; | |
108 | return -1; | |
109 | } | |
110 | ||
111 | #define CHECK_ERR(action, err, out) do { \ | |
112 | err = action; \ | |
113 | if (err) \ | |
114 | goto out; \ | |
115 | } while(0) | |
116 | ||
117 | ||
1a5e3fb1 WN |
118 | /* Copied from tools/perf/util/util.h */ |
119 | #ifndef zfree | |
120 | # define zfree(ptr) ({ free(*ptr); *ptr = NULL; }) | |
121 | #endif | |
122 | ||
123 | #ifndef zclose | |
124 | # define zclose(fd) ({ \ | |
125 | int ___err = 0; \ | |
126 | if ((fd) >= 0) \ | |
127 | ___err = close((fd)); \ | |
128 | fd = -1; \ | |
129 | ___err; }) | |
130 | #endif | |
131 | ||
132 | #ifdef HAVE_LIBELF_MMAP_SUPPORT | |
133 | # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ_MMAP | |
134 | #else | |
135 | # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ | |
136 | #endif | |
137 | ||
a5b8bd47 WN |
138 | /* |
139 | * bpf_prog should be a better name but it has been used in | |
140 | * linux/filter.h. | |
141 | */ | |
142 | struct bpf_program { | |
143 | /* Index in elf obj file, for relocation use. */ | |
144 | int idx; | |
145 | char *section_name; | |
146 | struct bpf_insn *insns; | |
147 | size_t insns_cnt; | |
34090915 WN |
148 | |
149 | struct { | |
150 | int insn_idx; | |
151 | int map_idx; | |
152 | } *reloc_desc; | |
153 | int nr_reloc; | |
55cffde2 | 154 | |
b580563e WN |
155 | struct { |
156 | int nr; | |
157 | int *fds; | |
158 | } instances; | |
159 | bpf_program_prep_t preprocessor; | |
aa9b1ac3 WN |
160 | |
161 | struct bpf_object *obj; | |
162 | void *priv; | |
163 | bpf_program_clear_priv_t clear_priv; | |
a5b8bd47 WN |
164 | }; |
165 | ||
9d759a9b WN |
166 | struct bpf_map { |
167 | int fd; | |
561bbcca | 168 | char *name; |
9d759a9b WN |
169 | struct bpf_map_def def; |
170 | void *priv; | |
171 | bpf_map_clear_priv_t clear_priv; | |
172 | }; | |
173 | ||
9a208eff WN |
174 | static LIST_HEAD(bpf_objects_list); |
175 | ||
1a5e3fb1 | 176 | struct bpf_object { |
cb1e5e96 WN |
177 | char license[64]; |
178 | u32 kern_version; | |
0b3d1efa | 179 | |
a5b8bd47 WN |
180 | struct bpf_program *programs; |
181 | size_t nr_programs; | |
9d759a9b WN |
182 | struct bpf_map *maps; |
183 | size_t nr_maps; | |
184 | ||
52d3352e | 185 | bool loaded; |
a5b8bd47 | 186 | |
1a5e3fb1 WN |
187 | /* |
188 | * Information when doing elf related work. Only valid if fd | |
189 | * is valid. | |
190 | */ | |
191 | struct { | |
192 | int fd; | |
6c956392 WN |
193 | void *obj_buf; |
194 | size_t obj_buf_sz; | |
1a5e3fb1 WN |
195 | Elf *elf; |
196 | GElf_Ehdr ehdr; | |
bec7d68c | 197 | Elf_Data *symbols; |
b62f06e8 WN |
198 | struct { |
199 | GElf_Shdr shdr; | |
200 | Elf_Data *data; | |
201 | } *reloc; | |
202 | int nr_reloc; | |
1a5e3fb1 | 203 | } efile; |
9a208eff WN |
204 | /* |
205 | * All loaded bpf_object is linked in a list, which is | |
206 | * hidden to caller. bpf_objects__<func> handlers deal with | |
207 | * all objects. | |
208 | */ | |
209 | struct list_head list; | |
1a5e3fb1 WN |
210 | char path[]; |
211 | }; | |
212 | #define obj_elf_valid(o) ((o)->efile.elf) | |
213 | ||
55cffde2 WN |
214 | static void bpf_program__unload(struct bpf_program *prog) |
215 | { | |
b580563e WN |
216 | int i; |
217 | ||
55cffde2 WN |
218 | if (!prog) |
219 | return; | |
220 | ||
b580563e WN |
221 | /* |
222 | * If the object is opened but the program was never loaded, | |
223 | * it is possible that prog->instances.nr == -1. | |
224 | */ | |
225 | if (prog->instances.nr > 0) { | |
226 | for (i = 0; i < prog->instances.nr; i++) | |
227 | zclose(prog->instances.fds[i]); | |
228 | } else if (prog->instances.nr != -1) { | |
229 | pr_warning("Internal error: instances.nr is %d\n", | |
230 | prog->instances.nr); | |
231 | } | |
232 | ||
233 | prog->instances.nr = -1; | |
234 | zfree(&prog->instances.fds); | |
55cffde2 WN |
235 | } |
236 | ||
a5b8bd47 WN |
237 | static void bpf_program__exit(struct bpf_program *prog) |
238 | { | |
239 | if (!prog) | |
240 | return; | |
241 | ||
aa9b1ac3 WN |
242 | if (prog->clear_priv) |
243 | prog->clear_priv(prog, prog->priv); | |
244 | ||
245 | prog->priv = NULL; | |
246 | prog->clear_priv = NULL; | |
247 | ||
55cffde2 | 248 | bpf_program__unload(prog); |
a5b8bd47 WN |
249 | zfree(&prog->section_name); |
250 | zfree(&prog->insns); | |
34090915 WN |
251 | zfree(&prog->reloc_desc); |
252 | ||
253 | prog->nr_reloc = 0; | |
a5b8bd47 WN |
254 | prog->insns_cnt = 0; |
255 | prog->idx = -1; | |
256 | } | |
257 | ||
258 | static int | |
259 | bpf_program__init(void *data, size_t size, char *name, int idx, | |
260 | struct bpf_program *prog) | |
261 | { | |
262 | if (size < sizeof(struct bpf_insn)) { | |
263 | pr_warning("corrupted section '%s'\n", name); | |
264 | return -EINVAL; | |
265 | } | |
266 | ||
267 | bzero(prog, sizeof(*prog)); | |
268 | ||
269 | prog->section_name = strdup(name); | |
270 | if (!prog->section_name) { | |
271 | pr_warning("failed to alloc name for prog %s\n", | |
272 | name); | |
273 | goto errout; | |
274 | } | |
275 | ||
276 | prog->insns = malloc(size); | |
277 | if (!prog->insns) { | |
278 | pr_warning("failed to alloc insns for %s\n", name); | |
279 | goto errout; | |
280 | } | |
281 | prog->insns_cnt = size / sizeof(struct bpf_insn); | |
282 | memcpy(prog->insns, data, | |
283 | prog->insns_cnt * sizeof(struct bpf_insn)); | |
284 | prog->idx = idx; | |
b580563e WN |
285 | prog->instances.fds = NULL; |
286 | prog->instances.nr = -1; | |
a5b8bd47 WN |
287 | |
288 | return 0; | |
289 | errout: | |
290 | bpf_program__exit(prog); | |
291 | return -ENOMEM; | |
292 | } | |
293 | ||
294 | static int | |
295 | bpf_object__add_program(struct bpf_object *obj, void *data, size_t size, | |
296 | char *name, int idx) | |
297 | { | |
298 | struct bpf_program prog, *progs; | |
299 | int nr_progs, err; | |
300 | ||
301 | err = bpf_program__init(data, size, name, idx, &prog); | |
302 | if (err) | |
303 | return err; | |
304 | ||
305 | progs = obj->programs; | |
306 | nr_progs = obj->nr_programs; | |
307 | ||
308 | progs = realloc(progs, sizeof(progs[0]) * (nr_progs + 1)); | |
309 | if (!progs) { | |
310 | /* | |
311 | * In this case the original obj->programs | |
312 | * is still valid, so don't need special treat for | |
313 | * bpf_close_object(). | |
314 | */ | |
315 | pr_warning("failed to alloc a new program '%s'\n", | |
316 | name); | |
317 | bpf_program__exit(&prog); | |
318 | return -ENOMEM; | |
319 | } | |
320 | ||
321 | pr_debug("found program %s\n", prog.section_name); | |
322 | obj->programs = progs; | |
323 | obj->nr_programs = nr_progs + 1; | |
aa9b1ac3 | 324 | prog.obj = obj; |
a5b8bd47 WN |
325 | progs[nr_progs] = prog; |
326 | return 0; | |
327 | } | |
328 | ||
6c956392 WN |
329 | static struct bpf_object *bpf_object__new(const char *path, |
330 | void *obj_buf, | |
331 | size_t obj_buf_sz) | |
1a5e3fb1 WN |
332 | { |
333 | struct bpf_object *obj; | |
334 | ||
335 | obj = calloc(1, sizeof(struct bpf_object) + strlen(path) + 1); | |
336 | if (!obj) { | |
337 | pr_warning("alloc memory failed for %s\n", path); | |
6371ca3b | 338 | return ERR_PTR(-ENOMEM); |
1a5e3fb1 WN |
339 | } |
340 | ||
341 | strcpy(obj->path, path); | |
342 | obj->efile.fd = -1; | |
6c956392 WN |
343 | |
344 | /* | |
345 | * Caller of this function should also calls | |
346 | * bpf_object__elf_finish() after data collection to return | |
347 | * obj_buf to user. If not, we should duplicate the buffer to | |
348 | * avoid user freeing them before elf finish. | |
349 | */ | |
350 | obj->efile.obj_buf = obj_buf; | |
351 | obj->efile.obj_buf_sz = obj_buf_sz; | |
352 | ||
52d3352e | 353 | obj->loaded = false; |
9a208eff WN |
354 | |
355 | INIT_LIST_HEAD(&obj->list); | |
356 | list_add(&obj->list, &bpf_objects_list); | |
1a5e3fb1 WN |
357 | return obj; |
358 | } | |
359 | ||
360 | static void bpf_object__elf_finish(struct bpf_object *obj) | |
361 | { | |
362 | if (!obj_elf_valid(obj)) | |
363 | return; | |
364 | ||
365 | if (obj->efile.elf) { | |
366 | elf_end(obj->efile.elf); | |
367 | obj->efile.elf = NULL; | |
368 | } | |
bec7d68c | 369 | obj->efile.symbols = NULL; |
b62f06e8 WN |
370 | |
371 | zfree(&obj->efile.reloc); | |
372 | obj->efile.nr_reloc = 0; | |
1a5e3fb1 | 373 | zclose(obj->efile.fd); |
6c956392 WN |
374 | obj->efile.obj_buf = NULL; |
375 | obj->efile.obj_buf_sz = 0; | |
1a5e3fb1 WN |
376 | } |
377 | ||
378 | static int bpf_object__elf_init(struct bpf_object *obj) | |
379 | { | |
380 | int err = 0; | |
381 | GElf_Ehdr *ep; | |
382 | ||
383 | if (obj_elf_valid(obj)) { | |
384 | pr_warning("elf init: internal error\n"); | |
6371ca3b | 385 | return -LIBBPF_ERRNO__LIBELF; |
1a5e3fb1 WN |
386 | } |
387 | ||
6c956392 WN |
388 | if (obj->efile.obj_buf_sz > 0) { |
389 | /* | |
390 | * obj_buf should have been validated by | |
391 | * bpf_object__open_buffer(). | |
392 | */ | |
393 | obj->efile.elf = elf_memory(obj->efile.obj_buf, | |
394 | obj->efile.obj_buf_sz); | |
395 | } else { | |
396 | obj->efile.fd = open(obj->path, O_RDONLY); | |
397 | if (obj->efile.fd < 0) { | |
398 | pr_warning("failed to open %s: %s\n", obj->path, | |
399 | strerror(errno)); | |
400 | return -errno; | |
401 | } | |
402 | ||
403 | obj->efile.elf = elf_begin(obj->efile.fd, | |
404 | LIBBPF_ELF_C_READ_MMAP, | |
405 | NULL); | |
1a5e3fb1 WN |
406 | } |
407 | ||
1a5e3fb1 WN |
408 | if (!obj->efile.elf) { |
409 | pr_warning("failed to open %s as ELF file\n", | |
410 | obj->path); | |
6371ca3b | 411 | err = -LIBBPF_ERRNO__LIBELF; |
1a5e3fb1 WN |
412 | goto errout; |
413 | } | |
414 | ||
415 | if (!gelf_getehdr(obj->efile.elf, &obj->efile.ehdr)) { | |
416 | pr_warning("failed to get EHDR from %s\n", | |
417 | obj->path); | |
6371ca3b | 418 | err = -LIBBPF_ERRNO__FORMAT; |
1a5e3fb1 WN |
419 | goto errout; |
420 | } | |
421 | ep = &obj->efile.ehdr; | |
422 | ||
423 | if ((ep->e_type != ET_REL) || (ep->e_machine != 0)) { | |
424 | pr_warning("%s is not an eBPF object file\n", | |
425 | obj->path); | |
6371ca3b | 426 | err = -LIBBPF_ERRNO__FORMAT; |
1a5e3fb1 WN |
427 | goto errout; |
428 | } | |
429 | ||
430 | return 0; | |
431 | errout: | |
432 | bpf_object__elf_finish(obj); | |
433 | return err; | |
434 | } | |
435 | ||
cc4228d5 WN |
436 | static int |
437 | bpf_object__check_endianness(struct bpf_object *obj) | |
438 | { | |
439 | static unsigned int const endian = 1; | |
440 | ||
441 | switch (obj->efile.ehdr.e_ident[EI_DATA]) { | |
442 | case ELFDATA2LSB: | |
443 | /* We are big endian, BPF obj is little endian. */ | |
444 | if (*(unsigned char const *)&endian != 1) | |
445 | goto mismatch; | |
446 | break; | |
447 | ||
448 | case ELFDATA2MSB: | |
449 | /* We are little endian, BPF obj is big endian. */ | |
450 | if (*(unsigned char const *)&endian != 0) | |
451 | goto mismatch; | |
452 | break; | |
453 | default: | |
6371ca3b | 454 | return -LIBBPF_ERRNO__ENDIAN; |
cc4228d5 WN |
455 | } |
456 | ||
457 | return 0; | |
458 | ||
459 | mismatch: | |
460 | pr_warning("Error: endianness mismatch.\n"); | |
6371ca3b | 461 | return -LIBBPF_ERRNO__ENDIAN; |
cc4228d5 WN |
462 | } |
463 | ||
cb1e5e96 WN |
464 | static int |
465 | bpf_object__init_license(struct bpf_object *obj, | |
466 | void *data, size_t size) | |
467 | { | |
468 | memcpy(obj->license, data, | |
469 | min(size, sizeof(obj->license) - 1)); | |
470 | pr_debug("license of %s is %s\n", obj->path, obj->license); | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static int | |
475 | bpf_object__init_kversion(struct bpf_object *obj, | |
476 | void *data, size_t size) | |
477 | { | |
478 | u32 kver; | |
479 | ||
480 | if (size != sizeof(kver)) { | |
481 | pr_warning("invalid kver section in %s\n", obj->path); | |
6371ca3b | 482 | return -LIBBPF_ERRNO__FORMAT; |
cb1e5e96 WN |
483 | } |
484 | memcpy(&kver, data, sizeof(kver)); | |
485 | obj->kern_version = kver; | |
486 | pr_debug("kernel version of %s is %x\n", obj->path, | |
487 | obj->kern_version); | |
488 | return 0; | |
489 | } | |
490 | ||
0b3d1efa WN |
491 | static int |
492 | bpf_object__init_maps(struct bpf_object *obj, void *data, | |
493 | size_t size) | |
494 | { | |
9d759a9b WN |
495 | size_t nr_maps; |
496 | int i; | |
497 | ||
498 | nr_maps = size / sizeof(struct bpf_map_def); | |
499 | if (!data || !nr_maps) { | |
0b3d1efa WN |
500 | pr_debug("%s doesn't need map definition\n", |
501 | obj->path); | |
502 | return 0; | |
503 | } | |
504 | ||
9d759a9b WN |
505 | pr_debug("maps in %s: %zd bytes\n", obj->path, size); |
506 | ||
507 | obj->maps = calloc(nr_maps, sizeof(obj->maps[0])); | |
508 | if (!obj->maps) { | |
509 | pr_warning("alloc maps for object failed\n"); | |
0b3d1efa WN |
510 | return -ENOMEM; |
511 | } | |
9d759a9b WN |
512 | obj->nr_maps = nr_maps; |
513 | ||
514 | for (i = 0; i < nr_maps; i++) { | |
515 | struct bpf_map_def *def = &obj->maps[i].def; | |
0b3d1efa | 516 | |
9d759a9b WN |
517 | /* |
518 | * fill all fd with -1 so won't close incorrect | |
519 | * fd (fd=0 is stdin) when failure (zclose won't close | |
520 | * negative fd)). | |
521 | */ | |
522 | obj->maps[i].fd = -1; | |
523 | ||
524 | /* Save map definition into obj->maps */ | |
525 | *def = ((struct bpf_map_def *)data)[i]; | |
526 | } | |
0b3d1efa WN |
527 | return 0; |
528 | } | |
529 | ||
973170e6 | 530 | static int |
561bbcca WN |
531 | bpf_object__init_maps_name(struct bpf_object *obj, int maps_shndx) |
532 | { | |
533 | int i; | |
534 | Elf_Data *symbols = obj->efile.symbols; | |
535 | ||
536 | if (!symbols || maps_shndx < 0) | |
973170e6 | 537 | return -EINVAL; |
561bbcca WN |
538 | |
539 | for (i = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) { | |
540 | GElf_Sym sym; | |
541 | size_t map_idx; | |
542 | const char *map_name; | |
543 | ||
544 | if (!gelf_getsym(symbols, i, &sym)) | |
545 | continue; | |
546 | if (sym.st_shndx != maps_shndx) | |
547 | continue; | |
548 | ||
549 | map_name = elf_strptr(obj->efile.elf, | |
550 | obj->efile.ehdr.e_shstrndx, | |
551 | sym.st_name); | |
552 | map_idx = sym.st_value / sizeof(struct bpf_map_def); | |
553 | if (map_idx >= obj->nr_maps) { | |
554 | pr_warning("index of map \"%s\" is buggy: %zu > %zu\n", | |
555 | map_name, map_idx, obj->nr_maps); | |
556 | continue; | |
557 | } | |
558 | obj->maps[map_idx].name = strdup(map_name); | |
973170e6 WN |
559 | if (!obj->maps[map_idx].name) { |
560 | pr_warning("failed to alloc map name\n"); | |
561 | return -ENOMEM; | |
562 | } | |
561bbcca WN |
563 | pr_debug("map %zu is \"%s\"\n", map_idx, |
564 | obj->maps[map_idx].name); | |
565 | } | |
973170e6 | 566 | return 0; |
561bbcca WN |
567 | } |
568 | ||
29603665 WN |
569 | static int bpf_object__elf_collect(struct bpf_object *obj) |
570 | { | |
571 | Elf *elf = obj->efile.elf; | |
572 | GElf_Ehdr *ep = &obj->efile.ehdr; | |
573 | Elf_Scn *scn = NULL; | |
561bbcca | 574 | int idx = 0, err = 0, maps_shndx = -1; |
29603665 WN |
575 | |
576 | /* Elf is corrupted/truncated, avoid calling elf_strptr. */ | |
577 | if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) { | |
578 | pr_warning("failed to get e_shstrndx from %s\n", | |
579 | obj->path); | |
6371ca3b | 580 | return -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
581 | } |
582 | ||
583 | while ((scn = elf_nextscn(elf, scn)) != NULL) { | |
584 | char *name; | |
585 | GElf_Shdr sh; | |
586 | Elf_Data *data; | |
587 | ||
588 | idx++; | |
589 | if (gelf_getshdr(scn, &sh) != &sh) { | |
590 | pr_warning("failed to get section header from %s\n", | |
591 | obj->path); | |
6371ca3b | 592 | err = -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
593 | goto out; |
594 | } | |
595 | ||
596 | name = elf_strptr(elf, ep->e_shstrndx, sh.sh_name); | |
597 | if (!name) { | |
598 | pr_warning("failed to get section name from %s\n", | |
599 | obj->path); | |
6371ca3b | 600 | err = -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
601 | goto out; |
602 | } | |
603 | ||
604 | data = elf_getdata(scn, 0); | |
605 | if (!data) { | |
606 | pr_warning("failed to get section data from %s(%s)\n", | |
607 | name, obj->path); | |
6371ca3b | 608 | err = -LIBBPF_ERRNO__FORMAT; |
29603665 WN |
609 | goto out; |
610 | } | |
611 | pr_debug("section %s, size %ld, link %d, flags %lx, type=%d\n", | |
612 | name, (unsigned long)data->d_size, | |
613 | (int)sh.sh_link, (unsigned long)sh.sh_flags, | |
614 | (int)sh.sh_type); | |
cb1e5e96 WN |
615 | |
616 | if (strcmp(name, "license") == 0) | |
617 | err = bpf_object__init_license(obj, | |
618 | data->d_buf, | |
619 | data->d_size); | |
620 | else if (strcmp(name, "version") == 0) | |
621 | err = bpf_object__init_kversion(obj, | |
622 | data->d_buf, | |
623 | data->d_size); | |
561bbcca | 624 | else if (strcmp(name, "maps") == 0) { |
0b3d1efa WN |
625 | err = bpf_object__init_maps(obj, data->d_buf, |
626 | data->d_size); | |
561bbcca WN |
627 | maps_shndx = idx; |
628 | } else if (sh.sh_type == SHT_SYMTAB) { | |
bec7d68c WN |
629 | if (obj->efile.symbols) { |
630 | pr_warning("bpf: multiple SYMTAB in %s\n", | |
631 | obj->path); | |
6371ca3b | 632 | err = -LIBBPF_ERRNO__FORMAT; |
bec7d68c WN |
633 | } else |
634 | obj->efile.symbols = data; | |
a5b8bd47 WN |
635 | } else if ((sh.sh_type == SHT_PROGBITS) && |
636 | (sh.sh_flags & SHF_EXECINSTR) && | |
637 | (data->d_size > 0)) { | |
638 | err = bpf_object__add_program(obj, data->d_buf, | |
639 | data->d_size, name, idx); | |
640 | if (err) { | |
6371ca3b WN |
641 | char errmsg[STRERR_BUFSIZE]; |
642 | ||
a5b8bd47 WN |
643 | strerror_r(-err, errmsg, sizeof(errmsg)); |
644 | pr_warning("failed to alloc program %s (%s): %s", | |
645 | name, obj->path, errmsg); | |
646 | } | |
b62f06e8 WN |
647 | } else if (sh.sh_type == SHT_REL) { |
648 | void *reloc = obj->efile.reloc; | |
649 | int nr_reloc = obj->efile.nr_reloc + 1; | |
650 | ||
651 | reloc = realloc(reloc, | |
652 | sizeof(*obj->efile.reloc) * nr_reloc); | |
653 | if (!reloc) { | |
654 | pr_warning("realloc failed\n"); | |
655 | err = -ENOMEM; | |
656 | } else { | |
657 | int n = nr_reloc - 1; | |
658 | ||
659 | obj->efile.reloc = reloc; | |
660 | obj->efile.nr_reloc = nr_reloc; | |
661 | ||
662 | obj->efile.reloc[n].shdr = sh; | |
663 | obj->efile.reloc[n].data = data; | |
664 | } | |
bec7d68c | 665 | } |
cb1e5e96 WN |
666 | if (err) |
667 | goto out; | |
29603665 | 668 | } |
561bbcca WN |
669 | |
670 | if (maps_shndx >= 0) | |
973170e6 | 671 | err = bpf_object__init_maps_name(obj, maps_shndx); |
29603665 WN |
672 | out: |
673 | return err; | |
674 | } | |
675 | ||
34090915 WN |
676 | static struct bpf_program * |
677 | bpf_object__find_prog_by_idx(struct bpf_object *obj, int idx) | |
678 | { | |
679 | struct bpf_program *prog; | |
680 | size_t i; | |
681 | ||
682 | for (i = 0; i < obj->nr_programs; i++) { | |
683 | prog = &obj->programs[i]; | |
684 | if (prog->idx == idx) | |
685 | return prog; | |
686 | } | |
687 | return NULL; | |
688 | } | |
689 | ||
690 | static int | |
691 | bpf_program__collect_reloc(struct bpf_program *prog, | |
692 | size_t nr_maps, GElf_Shdr *shdr, | |
693 | Elf_Data *data, Elf_Data *symbols) | |
694 | { | |
695 | int i, nrels; | |
696 | ||
697 | pr_debug("collecting relocating info for: '%s'\n", | |
698 | prog->section_name); | |
699 | nrels = shdr->sh_size / shdr->sh_entsize; | |
700 | ||
701 | prog->reloc_desc = malloc(sizeof(*prog->reloc_desc) * nrels); | |
702 | if (!prog->reloc_desc) { | |
703 | pr_warning("failed to alloc memory in relocation\n"); | |
704 | return -ENOMEM; | |
705 | } | |
706 | prog->nr_reloc = nrels; | |
707 | ||
708 | for (i = 0; i < nrels; i++) { | |
709 | GElf_Sym sym; | |
710 | GElf_Rel rel; | |
711 | unsigned int insn_idx; | |
712 | struct bpf_insn *insns = prog->insns; | |
713 | size_t map_idx; | |
714 | ||
715 | if (!gelf_getrel(data, i, &rel)) { | |
716 | pr_warning("relocation: failed to get %d reloc\n", i); | |
6371ca3b | 717 | return -LIBBPF_ERRNO__FORMAT; |
34090915 WN |
718 | } |
719 | ||
720 | insn_idx = rel.r_offset / sizeof(struct bpf_insn); | |
721 | pr_debug("relocation: insn_idx=%u\n", insn_idx); | |
722 | ||
723 | if (!gelf_getsym(symbols, | |
724 | GELF_R_SYM(rel.r_info), | |
725 | &sym)) { | |
726 | pr_warning("relocation: symbol %"PRIx64" not found\n", | |
727 | GELF_R_SYM(rel.r_info)); | |
6371ca3b | 728 | return -LIBBPF_ERRNO__FORMAT; |
34090915 WN |
729 | } |
730 | ||
731 | if (insns[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) { | |
732 | pr_warning("bpf: relocation: invalid relo for insns[%d].code 0x%x\n", | |
733 | insn_idx, insns[insn_idx].code); | |
6371ca3b | 734 | return -LIBBPF_ERRNO__RELOC; |
34090915 WN |
735 | } |
736 | ||
737 | map_idx = sym.st_value / sizeof(struct bpf_map_def); | |
738 | if (map_idx >= nr_maps) { | |
739 | pr_warning("bpf relocation: map_idx %d large than %d\n", | |
740 | (int)map_idx, (int)nr_maps - 1); | |
6371ca3b | 741 | return -LIBBPF_ERRNO__RELOC; |
34090915 WN |
742 | } |
743 | ||
744 | prog->reloc_desc[i].insn_idx = insn_idx; | |
745 | prog->reloc_desc[i].map_idx = map_idx; | |
746 | } | |
747 | return 0; | |
748 | } | |
749 | ||
52d3352e WN |
750 | static int |
751 | bpf_object__create_maps(struct bpf_object *obj) | |
752 | { | |
753 | unsigned int i; | |
52d3352e | 754 | |
9d759a9b WN |
755 | for (i = 0; i < obj->nr_maps; i++) { |
756 | struct bpf_map_def *def = &obj->maps[i].def; | |
757 | int *pfd = &obj->maps[i].fd; | |
52d3352e | 758 | |
9d759a9b WN |
759 | *pfd = bpf_create_map(def->type, |
760 | def->key_size, | |
761 | def->value_size, | |
762 | def->max_entries); | |
52d3352e WN |
763 | if (*pfd < 0) { |
764 | size_t j; | |
765 | int err = *pfd; | |
766 | ||
767 | pr_warning("failed to create map: %s\n", | |
768 | strerror(errno)); | |
769 | for (j = 0; j < i; j++) | |
9d759a9b | 770 | zclose(obj->maps[j].fd); |
52d3352e WN |
771 | return err; |
772 | } | |
773 | pr_debug("create map: fd=%d\n", *pfd); | |
52d3352e WN |
774 | } |
775 | ||
52d3352e WN |
776 | return 0; |
777 | } | |
778 | ||
8a47a6c5 | 779 | static int |
9d759a9b | 780 | bpf_program__relocate(struct bpf_program *prog, struct bpf_object *obj) |
8a47a6c5 WN |
781 | { |
782 | int i; | |
783 | ||
784 | if (!prog || !prog->reloc_desc) | |
785 | return 0; | |
786 | ||
787 | for (i = 0; i < prog->nr_reloc; i++) { | |
788 | int insn_idx, map_idx; | |
789 | struct bpf_insn *insns = prog->insns; | |
790 | ||
791 | insn_idx = prog->reloc_desc[i].insn_idx; | |
792 | map_idx = prog->reloc_desc[i].map_idx; | |
793 | ||
794 | if (insn_idx >= (int)prog->insns_cnt) { | |
795 | pr_warning("relocation out of range: '%s'\n", | |
796 | prog->section_name); | |
6371ca3b | 797 | return -LIBBPF_ERRNO__RELOC; |
8a47a6c5 WN |
798 | } |
799 | insns[insn_idx].src_reg = BPF_PSEUDO_MAP_FD; | |
9d759a9b | 800 | insns[insn_idx].imm = obj->maps[map_idx].fd; |
8a47a6c5 WN |
801 | } |
802 | ||
803 | zfree(&prog->reloc_desc); | |
804 | prog->nr_reloc = 0; | |
805 | return 0; | |
806 | } | |
807 | ||
808 | ||
809 | static int | |
810 | bpf_object__relocate(struct bpf_object *obj) | |
811 | { | |
812 | struct bpf_program *prog; | |
813 | size_t i; | |
814 | int err; | |
815 | ||
816 | for (i = 0; i < obj->nr_programs; i++) { | |
817 | prog = &obj->programs[i]; | |
818 | ||
9d759a9b | 819 | err = bpf_program__relocate(prog, obj); |
8a47a6c5 WN |
820 | if (err) { |
821 | pr_warning("failed to relocate '%s'\n", | |
822 | prog->section_name); | |
823 | return err; | |
824 | } | |
825 | } | |
826 | return 0; | |
827 | } | |
828 | ||
34090915 WN |
829 | static int bpf_object__collect_reloc(struct bpf_object *obj) |
830 | { | |
831 | int i, err; | |
832 | ||
833 | if (!obj_elf_valid(obj)) { | |
834 | pr_warning("Internal error: elf object is closed\n"); | |
6371ca3b | 835 | return -LIBBPF_ERRNO__INTERNAL; |
34090915 WN |
836 | } |
837 | ||
838 | for (i = 0; i < obj->efile.nr_reloc; i++) { | |
839 | GElf_Shdr *shdr = &obj->efile.reloc[i].shdr; | |
840 | Elf_Data *data = obj->efile.reloc[i].data; | |
841 | int idx = shdr->sh_info; | |
842 | struct bpf_program *prog; | |
9d759a9b | 843 | size_t nr_maps = obj->nr_maps; |
34090915 WN |
844 | |
845 | if (shdr->sh_type != SHT_REL) { | |
846 | pr_warning("internal error at %d\n", __LINE__); | |
6371ca3b | 847 | return -LIBBPF_ERRNO__INTERNAL; |
34090915 WN |
848 | } |
849 | ||
850 | prog = bpf_object__find_prog_by_idx(obj, idx); | |
851 | if (!prog) { | |
852 | pr_warning("relocation failed: no %d section\n", | |
853 | idx); | |
6371ca3b | 854 | return -LIBBPF_ERRNO__RELOC; |
34090915 WN |
855 | } |
856 | ||
857 | err = bpf_program__collect_reloc(prog, nr_maps, | |
858 | shdr, data, | |
859 | obj->efile.symbols); | |
860 | if (err) | |
6371ca3b | 861 | return err; |
34090915 WN |
862 | } |
863 | return 0; | |
864 | } | |
865 | ||
55cffde2 WN |
866 | static int |
867 | load_program(struct bpf_insn *insns, int insns_cnt, | |
868 | char *license, u32 kern_version, int *pfd) | |
869 | { | |
870 | int ret; | |
871 | char *log_buf; | |
872 | ||
873 | if (!insns || !insns_cnt) | |
874 | return -EINVAL; | |
875 | ||
876 | log_buf = malloc(BPF_LOG_BUF_SIZE); | |
877 | if (!log_buf) | |
878 | pr_warning("Alloc log buffer for bpf loader error, continue without log\n"); | |
879 | ||
880 | ret = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns, | |
881 | insns_cnt, license, kern_version, | |
882 | log_buf, BPF_LOG_BUF_SIZE); | |
883 | ||
884 | if (ret >= 0) { | |
885 | *pfd = ret; | |
886 | ret = 0; | |
887 | goto out; | |
888 | } | |
889 | ||
6371ca3b | 890 | ret = -LIBBPF_ERRNO__LOAD; |
55cffde2 WN |
891 | pr_warning("load bpf program failed: %s\n", strerror(errno)); |
892 | ||
6371ca3b WN |
893 | if (log_buf && log_buf[0] != '\0') { |
894 | ret = -LIBBPF_ERRNO__VERIFY; | |
55cffde2 WN |
895 | pr_warning("-- BEGIN DUMP LOG ---\n"); |
896 | pr_warning("\n%s\n", log_buf); | |
897 | pr_warning("-- END LOG --\n"); | |
6371ca3b WN |
898 | } else { |
899 | if (insns_cnt >= BPF_MAXINSNS) { | |
900 | pr_warning("Program too large (%d insns), at most %d insns\n", | |
901 | insns_cnt, BPF_MAXINSNS); | |
902 | ret = -LIBBPF_ERRNO__PROG2BIG; | |
903 | } else if (log_buf) { | |
904 | pr_warning("log buffer is empty\n"); | |
905 | ret = -LIBBPF_ERRNO__KVER; | |
906 | } | |
55cffde2 WN |
907 | } |
908 | ||
909 | out: | |
910 | free(log_buf); | |
911 | return ret; | |
912 | } | |
913 | ||
914 | static int | |
915 | bpf_program__load(struct bpf_program *prog, | |
916 | char *license, u32 kern_version) | |
917 | { | |
b580563e | 918 | int err = 0, fd, i; |
55cffde2 | 919 | |
b580563e WN |
920 | if (prog->instances.nr < 0 || !prog->instances.fds) { |
921 | if (prog->preprocessor) { | |
922 | pr_warning("Internal error: can't load program '%s'\n", | |
923 | prog->section_name); | |
924 | return -LIBBPF_ERRNO__INTERNAL; | |
925 | } | |
55cffde2 | 926 | |
b580563e WN |
927 | prog->instances.fds = malloc(sizeof(int)); |
928 | if (!prog->instances.fds) { | |
929 | pr_warning("Not enough memory for BPF fds\n"); | |
930 | return -ENOMEM; | |
931 | } | |
932 | prog->instances.nr = 1; | |
933 | prog->instances.fds[0] = -1; | |
934 | } | |
935 | ||
936 | if (!prog->preprocessor) { | |
937 | if (prog->instances.nr != 1) { | |
938 | pr_warning("Program '%s' is inconsistent: nr(%d) != 1\n", | |
939 | prog->section_name, prog->instances.nr); | |
940 | } | |
941 | err = load_program(prog->insns, prog->insns_cnt, | |
942 | license, kern_version, &fd); | |
943 | if (!err) | |
944 | prog->instances.fds[0] = fd; | |
945 | goto out; | |
946 | } | |
947 | ||
948 | for (i = 0; i < prog->instances.nr; i++) { | |
949 | struct bpf_prog_prep_result result; | |
950 | bpf_program_prep_t preprocessor = prog->preprocessor; | |
951 | ||
952 | bzero(&result, sizeof(result)); | |
953 | err = preprocessor(prog, i, prog->insns, | |
954 | prog->insns_cnt, &result); | |
955 | if (err) { | |
956 | pr_warning("Preprocessing the %dth instance of program '%s' failed\n", | |
957 | i, prog->section_name); | |
958 | goto out; | |
959 | } | |
960 | ||
961 | if (!result.new_insn_ptr || !result.new_insn_cnt) { | |
962 | pr_debug("Skip loading the %dth instance of program '%s'\n", | |
963 | i, prog->section_name); | |
964 | prog->instances.fds[i] = -1; | |
965 | if (result.pfd) | |
966 | *result.pfd = -1; | |
967 | continue; | |
968 | } | |
969 | ||
970 | err = load_program(result.new_insn_ptr, | |
971 | result.new_insn_cnt, | |
972 | license, kern_version, &fd); | |
973 | ||
974 | if (err) { | |
975 | pr_warning("Loading the %dth instance of program '%s' failed\n", | |
976 | i, prog->section_name); | |
977 | goto out; | |
978 | } | |
979 | ||
980 | if (result.pfd) | |
981 | *result.pfd = fd; | |
982 | prog->instances.fds[i] = fd; | |
983 | } | |
984 | out: | |
55cffde2 WN |
985 | if (err) |
986 | pr_warning("failed to load program '%s'\n", | |
987 | prog->section_name); | |
988 | zfree(&prog->insns); | |
989 | prog->insns_cnt = 0; | |
990 | return err; | |
991 | } | |
992 | ||
993 | static int | |
994 | bpf_object__load_progs(struct bpf_object *obj) | |
995 | { | |
996 | size_t i; | |
997 | int err; | |
998 | ||
999 | for (i = 0; i < obj->nr_programs; i++) { | |
1000 | err = bpf_program__load(&obj->programs[i], | |
1001 | obj->license, | |
1002 | obj->kern_version); | |
1003 | if (err) | |
1004 | return err; | |
1005 | } | |
1006 | return 0; | |
1007 | } | |
1008 | ||
cb1e5e96 WN |
1009 | static int bpf_object__validate(struct bpf_object *obj) |
1010 | { | |
1011 | if (obj->kern_version == 0) { | |
1012 | pr_warning("%s doesn't provide kernel version\n", | |
1013 | obj->path); | |
6371ca3b | 1014 | return -LIBBPF_ERRNO__KVERSION; |
cb1e5e96 WN |
1015 | } |
1016 | return 0; | |
1017 | } | |
1018 | ||
1a5e3fb1 | 1019 | static struct bpf_object * |
6c956392 | 1020 | __bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz) |
1a5e3fb1 WN |
1021 | { |
1022 | struct bpf_object *obj; | |
6371ca3b | 1023 | int err; |
1a5e3fb1 WN |
1024 | |
1025 | if (elf_version(EV_CURRENT) == EV_NONE) { | |
1026 | pr_warning("failed to init libelf for %s\n", path); | |
6371ca3b | 1027 | return ERR_PTR(-LIBBPF_ERRNO__LIBELF); |
1a5e3fb1 WN |
1028 | } |
1029 | ||
6c956392 | 1030 | obj = bpf_object__new(path, obj_buf, obj_buf_sz); |
6371ca3b WN |
1031 | if (IS_ERR(obj)) |
1032 | return obj; | |
1a5e3fb1 | 1033 | |
6371ca3b WN |
1034 | CHECK_ERR(bpf_object__elf_init(obj), err, out); |
1035 | CHECK_ERR(bpf_object__check_endianness(obj), err, out); | |
1036 | CHECK_ERR(bpf_object__elf_collect(obj), err, out); | |
1037 | CHECK_ERR(bpf_object__collect_reloc(obj), err, out); | |
1038 | CHECK_ERR(bpf_object__validate(obj), err, out); | |
1a5e3fb1 WN |
1039 | |
1040 | bpf_object__elf_finish(obj); | |
1041 | return obj; | |
1042 | out: | |
1043 | bpf_object__close(obj); | |
6371ca3b | 1044 | return ERR_PTR(err); |
1a5e3fb1 WN |
1045 | } |
1046 | ||
1047 | struct bpf_object *bpf_object__open(const char *path) | |
1048 | { | |
1049 | /* param validation */ | |
1050 | if (!path) | |
1051 | return NULL; | |
1052 | ||
1053 | pr_debug("loading %s\n", path); | |
1054 | ||
6c956392 WN |
1055 | return __bpf_object__open(path, NULL, 0); |
1056 | } | |
1057 | ||
1058 | struct bpf_object *bpf_object__open_buffer(void *obj_buf, | |
acf860ae WN |
1059 | size_t obj_buf_sz, |
1060 | const char *name) | |
6c956392 | 1061 | { |
acf860ae WN |
1062 | char tmp_name[64]; |
1063 | ||
6c956392 WN |
1064 | /* param validation */ |
1065 | if (!obj_buf || obj_buf_sz <= 0) | |
1066 | return NULL; | |
1067 | ||
acf860ae WN |
1068 | if (!name) { |
1069 | snprintf(tmp_name, sizeof(tmp_name), "%lx-%lx", | |
1070 | (unsigned long)obj_buf, | |
1071 | (unsigned long)obj_buf_sz); | |
1072 | tmp_name[sizeof(tmp_name) - 1] = '\0'; | |
1073 | name = tmp_name; | |
1074 | } | |
1075 | pr_debug("loading object '%s' from buffer\n", | |
1076 | name); | |
6c956392 | 1077 | |
acf860ae | 1078 | return __bpf_object__open(name, obj_buf, obj_buf_sz); |
1a5e3fb1 WN |
1079 | } |
1080 | ||
52d3352e WN |
1081 | int bpf_object__unload(struct bpf_object *obj) |
1082 | { | |
1083 | size_t i; | |
1084 | ||
1085 | if (!obj) | |
1086 | return -EINVAL; | |
1087 | ||
9d759a9b WN |
1088 | for (i = 0; i < obj->nr_maps; i++) |
1089 | zclose(obj->maps[i].fd); | |
52d3352e | 1090 | |
55cffde2 WN |
1091 | for (i = 0; i < obj->nr_programs; i++) |
1092 | bpf_program__unload(&obj->programs[i]); | |
1093 | ||
52d3352e WN |
1094 | return 0; |
1095 | } | |
1096 | ||
1097 | int bpf_object__load(struct bpf_object *obj) | |
1098 | { | |
6371ca3b WN |
1099 | int err; |
1100 | ||
52d3352e WN |
1101 | if (!obj) |
1102 | return -EINVAL; | |
1103 | ||
1104 | if (obj->loaded) { | |
1105 | pr_warning("object should not be loaded twice\n"); | |
1106 | return -EINVAL; | |
1107 | } | |
1108 | ||
1109 | obj->loaded = true; | |
6371ca3b WN |
1110 | |
1111 | CHECK_ERR(bpf_object__create_maps(obj), err, out); | |
1112 | CHECK_ERR(bpf_object__relocate(obj), err, out); | |
1113 | CHECK_ERR(bpf_object__load_progs(obj), err, out); | |
52d3352e WN |
1114 | |
1115 | return 0; | |
1116 | out: | |
1117 | bpf_object__unload(obj); | |
1118 | pr_warning("failed to load object '%s'\n", obj->path); | |
6371ca3b | 1119 | return err; |
52d3352e WN |
1120 | } |
1121 | ||
1a5e3fb1 WN |
1122 | void bpf_object__close(struct bpf_object *obj) |
1123 | { | |
a5b8bd47 WN |
1124 | size_t i; |
1125 | ||
1a5e3fb1 WN |
1126 | if (!obj) |
1127 | return; | |
1128 | ||
1129 | bpf_object__elf_finish(obj); | |
52d3352e | 1130 | bpf_object__unload(obj); |
1a5e3fb1 | 1131 | |
9d759a9b | 1132 | for (i = 0; i < obj->nr_maps; i++) { |
561bbcca | 1133 | zfree(&obj->maps[i].name); |
9d759a9b WN |
1134 | if (obj->maps[i].clear_priv) |
1135 | obj->maps[i].clear_priv(&obj->maps[i], | |
1136 | obj->maps[i].priv); | |
1137 | obj->maps[i].priv = NULL; | |
1138 | obj->maps[i].clear_priv = NULL; | |
1139 | } | |
1140 | zfree(&obj->maps); | |
1141 | obj->nr_maps = 0; | |
a5b8bd47 WN |
1142 | |
1143 | if (obj->programs && obj->nr_programs) { | |
1144 | for (i = 0; i < obj->nr_programs; i++) | |
1145 | bpf_program__exit(&obj->programs[i]); | |
1146 | } | |
1147 | zfree(&obj->programs); | |
1148 | ||
9a208eff | 1149 | list_del(&obj->list); |
1a5e3fb1 WN |
1150 | free(obj); |
1151 | } | |
aa9b1ac3 | 1152 | |
9a208eff WN |
1153 | struct bpf_object * |
1154 | bpf_object__next(struct bpf_object *prev) | |
1155 | { | |
1156 | struct bpf_object *next; | |
1157 | ||
1158 | if (!prev) | |
1159 | next = list_first_entry(&bpf_objects_list, | |
1160 | struct bpf_object, | |
1161 | list); | |
1162 | else | |
1163 | next = list_next_entry(prev, list); | |
1164 | ||
1165 | /* Empty list is noticed here so don't need checking on entry. */ | |
1166 | if (&next->list == &bpf_objects_list) | |
1167 | return NULL; | |
1168 | ||
1169 | return next; | |
1170 | } | |
1171 | ||
acf860ae WN |
1172 | const char * |
1173 | bpf_object__get_name(struct bpf_object *obj) | |
1174 | { | |
1175 | if (!obj) | |
6371ca3b | 1176 | return ERR_PTR(-EINVAL); |
acf860ae WN |
1177 | return obj->path; |
1178 | } | |
1179 | ||
45825d8a WN |
1180 | unsigned int |
1181 | bpf_object__get_kversion(struct bpf_object *obj) | |
1182 | { | |
1183 | if (!obj) | |
1184 | return 0; | |
1185 | return obj->kern_version; | |
1186 | } | |
1187 | ||
aa9b1ac3 WN |
1188 | struct bpf_program * |
1189 | bpf_program__next(struct bpf_program *prev, struct bpf_object *obj) | |
1190 | { | |
1191 | size_t idx; | |
1192 | ||
1193 | if (!obj->programs) | |
1194 | return NULL; | |
1195 | /* First handler */ | |
1196 | if (prev == NULL) | |
1197 | return &obj->programs[0]; | |
1198 | ||
1199 | if (prev->obj != obj) { | |
1200 | pr_warning("error: program handler doesn't match object\n"); | |
1201 | return NULL; | |
1202 | } | |
1203 | ||
1204 | idx = (prev - obj->programs) + 1; | |
1205 | if (idx >= obj->nr_programs) | |
1206 | return NULL; | |
1207 | return &obj->programs[idx]; | |
1208 | } | |
1209 | ||
1210 | int bpf_program__set_private(struct bpf_program *prog, | |
1211 | void *priv, | |
1212 | bpf_program_clear_priv_t clear_priv) | |
1213 | { | |
1214 | if (prog->priv && prog->clear_priv) | |
1215 | prog->clear_priv(prog, prog->priv); | |
1216 | ||
1217 | prog->priv = priv; | |
1218 | prog->clear_priv = clear_priv; | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | int bpf_program__get_private(struct bpf_program *prog, void **ppriv) | |
1223 | { | |
1224 | *ppriv = prog->priv; | |
1225 | return 0; | |
1226 | } | |
1227 | ||
715f8db9 | 1228 | const char *bpf_program__title(struct bpf_program *prog, bool needs_copy) |
aa9b1ac3 WN |
1229 | { |
1230 | const char *title; | |
1231 | ||
1232 | title = prog->section_name; | |
715f8db9 | 1233 | if (needs_copy) { |
aa9b1ac3 WN |
1234 | title = strdup(title); |
1235 | if (!title) { | |
1236 | pr_warning("failed to strdup program title\n"); | |
6371ca3b | 1237 | return ERR_PTR(-ENOMEM); |
aa9b1ac3 WN |
1238 | } |
1239 | } | |
1240 | ||
1241 | return title; | |
1242 | } | |
1243 | ||
1244 | int bpf_program__fd(struct bpf_program *prog) | |
1245 | { | |
b580563e WN |
1246 | return bpf_program__nth_fd(prog, 0); |
1247 | } | |
1248 | ||
1249 | int bpf_program__set_prep(struct bpf_program *prog, int nr_instances, | |
1250 | bpf_program_prep_t prep) | |
1251 | { | |
1252 | int *instances_fds; | |
1253 | ||
1254 | if (nr_instances <= 0 || !prep) | |
1255 | return -EINVAL; | |
1256 | ||
1257 | if (prog->instances.nr > 0 || prog->instances.fds) { | |
1258 | pr_warning("Can't set pre-processor after loading\n"); | |
1259 | return -EINVAL; | |
1260 | } | |
1261 | ||
1262 | instances_fds = malloc(sizeof(int) * nr_instances); | |
1263 | if (!instances_fds) { | |
1264 | pr_warning("alloc memory failed for fds\n"); | |
1265 | return -ENOMEM; | |
1266 | } | |
1267 | ||
1268 | /* fill all fd with -1 */ | |
1269 | memset(instances_fds, -1, sizeof(int) * nr_instances); | |
1270 | ||
1271 | prog->instances.nr = nr_instances; | |
1272 | prog->instances.fds = instances_fds; | |
1273 | prog->preprocessor = prep; | |
1274 | return 0; | |
1275 | } | |
1276 | ||
1277 | int bpf_program__nth_fd(struct bpf_program *prog, int n) | |
1278 | { | |
1279 | int fd; | |
1280 | ||
1281 | if (n >= prog->instances.nr || n < 0) { | |
1282 | pr_warning("Can't get the %dth fd from program %s: only %d instances\n", | |
1283 | n, prog->section_name, prog->instances.nr); | |
1284 | return -EINVAL; | |
1285 | } | |
1286 | ||
1287 | fd = prog->instances.fds[n]; | |
1288 | if (fd < 0) { | |
1289 | pr_warning("%dth instance of program '%s' is invalid\n", | |
1290 | n, prog->section_name); | |
1291 | return -ENOENT; | |
1292 | } | |
1293 | ||
1294 | return fd; | |
aa9b1ac3 | 1295 | } |
9d759a9b WN |
1296 | |
1297 | int bpf_map__get_fd(struct bpf_map *map) | |
1298 | { | |
1299 | if (!map) | |
1300 | return -EINVAL; | |
1301 | ||
1302 | return map->fd; | |
1303 | } | |
1304 | ||
1305 | int bpf_map__get_def(struct bpf_map *map, struct bpf_map_def *pdef) | |
1306 | { | |
1307 | if (!map || !pdef) | |
1308 | return -EINVAL; | |
1309 | ||
1310 | *pdef = map->def; | |
1311 | return 0; | |
1312 | } | |
1313 | ||
561bbcca WN |
1314 | const char *bpf_map__get_name(struct bpf_map *map) |
1315 | { | |
1316 | if (!map) | |
1317 | return NULL; | |
1318 | return map->name; | |
1319 | } | |
1320 | ||
9d759a9b WN |
1321 | int bpf_map__set_private(struct bpf_map *map, void *priv, |
1322 | bpf_map_clear_priv_t clear_priv) | |
1323 | { | |
1324 | if (!map) | |
1325 | return -EINVAL; | |
1326 | ||
1327 | if (map->priv) { | |
1328 | if (map->clear_priv) | |
1329 | map->clear_priv(map, map->priv); | |
1330 | } | |
1331 | ||
1332 | map->priv = priv; | |
1333 | map->clear_priv = clear_priv; | |
1334 | return 0; | |
1335 | } | |
1336 | ||
1337 | int bpf_map__get_private(struct bpf_map *map, void **ppriv) | |
1338 | { | |
1339 | if (!map) | |
1340 | return -EINVAL; | |
1341 | ||
1342 | if (ppriv) | |
1343 | *ppriv = map->priv; | |
1344 | return 0; | |
1345 | } | |
1346 | ||
1347 | struct bpf_map * | |
1348 | bpf_map__next(struct bpf_map *prev, struct bpf_object *obj) | |
1349 | { | |
1350 | size_t idx; | |
1351 | struct bpf_map *s, *e; | |
1352 | ||
1353 | if (!obj || !obj->maps) | |
1354 | return NULL; | |
1355 | ||
1356 | s = obj->maps; | |
1357 | e = obj->maps + obj->nr_maps; | |
1358 | ||
1359 | if (prev == NULL) | |
1360 | return s; | |
1361 | ||
1362 | if ((prev < s) || (prev >= e)) { | |
1363 | pr_warning("error in %s: map handler doesn't belong to object\n", | |
1364 | __func__); | |
1365 | return NULL; | |
1366 | } | |
1367 | ||
1368 | idx = (prev - obj->maps) + 1; | |
1369 | if (idx >= obj->nr_maps) | |
1370 | return NULL; | |
1371 | return &obj->maps[idx]; | |
1372 | } | |
561bbcca WN |
1373 | |
1374 | struct bpf_map * | |
1375 | bpf_object__get_map_by_name(struct bpf_object *obj, const char *name) | |
1376 | { | |
1377 | struct bpf_map *pos; | |
1378 | ||
1379 | bpf_map__for_each(pos, obj) { | |
973170e6 | 1380 | if (pos->name && !strcmp(pos->name, name)) |
561bbcca WN |
1381 | return pos; |
1382 | } | |
1383 | return NULL; | |
1384 | } |