Wang Nan | 1b76c13 | 2015-07-01 02:13:51 +0000 | [diff] [blame] | 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. |
Wang Nan | 203d1ca | 2016-07-04 11:02:42 +0000 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; |
| 11 | * version 2.1 of the License (not later!) |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with this program; if not, see <http://www.gnu.org/licenses> |
Wang Nan | 1b76c13 | 2015-07-01 02:13:51 +0000 | [diff] [blame] | 20 | */ |
| 21 | |
| 22 | #include <stdlib.h> |
Wang Nan | b3f59d6 | 2015-07-01 02:13:52 +0000 | [diff] [blame] | 23 | #include <stdio.h> |
| 24 | #include <stdarg.h> |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 25 | #include <inttypes.h> |
Wang Nan | b3f59d6 | 2015-07-01 02:13:52 +0000 | [diff] [blame] | 26 | #include <string.h> |
Wang Nan | 1b76c13 | 2015-07-01 02:13:51 +0000 | [diff] [blame] | 27 | #include <unistd.h> |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 28 | #include <fcntl.h> |
| 29 | #include <errno.h> |
Wang Nan | 1b76c13 | 2015-07-01 02:13:51 +0000 | [diff] [blame] | 30 | #include <asm/unistd.h> |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 31 | #include <linux/kernel.h> |
Wang Nan | 1b76c13 | 2015-07-01 02:13:51 +0000 | [diff] [blame] | 32 | #include <linux/bpf.h> |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 33 | #include <linux/list.h> |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 34 | #include <libelf.h> |
| 35 | #include <gelf.h> |
Wang Nan | 1b76c13 | 2015-07-01 02:13:51 +0000 | [diff] [blame] | 36 | |
| 37 | #include "libbpf.h" |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 38 | #include "bpf.h" |
Wang Nan | b3f59d6 | 2015-07-01 02:13:52 +0000 | [diff] [blame] | 39 | |
Wang Nan | 9b16137 | 2016-07-18 06:01:08 +0000 | [diff] [blame] | 40 | #ifndef EM_BPF |
| 41 | #define EM_BPF 247 |
| 42 | #endif |
| 43 | |
Wang Nan | b3f59d6 | 2015-07-01 02:13:52 +0000 | [diff] [blame] | 44 | #define __printf(a, b) __attribute__((format(printf, a, b))) |
| 45 | |
| 46 | __printf(1, 2) |
| 47 | static int __base_pr(const char *format, ...) |
| 48 | { |
| 49 | va_list args; |
| 50 | int err; |
| 51 | |
| 52 | va_start(args, format); |
| 53 | err = vfprintf(stderr, format, args); |
| 54 | va_end(args); |
| 55 | return err; |
| 56 | } |
| 57 | |
| 58 | static __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr; |
| 59 | static __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr; |
| 60 | static __printf(1, 2) libbpf_print_fn_t __pr_debug; |
| 61 | |
| 62 | #define __pr(func, fmt, ...) \ |
| 63 | do { \ |
| 64 | if ((func)) \ |
| 65 | (func)("libbpf: " fmt, ##__VA_ARGS__); \ |
| 66 | } while (0) |
| 67 | |
| 68 | #define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__) |
| 69 | #define pr_info(fmt, ...) __pr(__pr_info, fmt, ##__VA_ARGS__) |
| 70 | #define pr_debug(fmt, ...) __pr(__pr_debug, fmt, ##__VA_ARGS__) |
| 71 | |
| 72 | void libbpf_set_print(libbpf_print_fn_t warn, |
| 73 | libbpf_print_fn_t info, |
| 74 | libbpf_print_fn_t debug) |
| 75 | { |
| 76 | __pr_warning = warn; |
| 77 | __pr_info = info; |
| 78 | __pr_debug = debug; |
| 79 | } |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 80 | |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 81 | #define STRERR_BUFSIZE 128 |
| 82 | |
| 83 | #define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START) |
| 84 | #define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c) |
| 85 | #define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START) |
| 86 | |
| 87 | static const char *libbpf_strerror_table[NR_ERRNO] = { |
| 88 | [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf", |
| 89 | [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid", |
| 90 | [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost", |
Colin Ian King | de8a63b | 2016-06-28 13:23:37 +0100 | [diff] [blame] | 91 | [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch", |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 92 | [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf", |
| 93 | [ERRCODE_OFFSET(RELOC)] = "Relocation failed", |
| 94 | [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading", |
| 95 | [ERRCODE_OFFSET(PROG2BIG)] = "Program too big", |
| 96 | [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version", |
Wang Nan | 705fa21 | 2016-07-13 10:44:02 +0000 | [diff] [blame] | 97 | [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type", |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 98 | }; |
| 99 | |
| 100 | int libbpf_strerror(int err, char *buf, size_t size) |
| 101 | { |
| 102 | if (!buf || !size) |
| 103 | return -1; |
| 104 | |
| 105 | err = err > 0 ? err : -err; |
| 106 | |
| 107 | if (err < __LIBBPF_ERRNO__START) { |
| 108 | int ret; |
| 109 | |
| 110 | ret = strerror_r(err, buf, size); |
| 111 | buf[size - 1] = '\0'; |
| 112 | return ret; |
| 113 | } |
| 114 | |
| 115 | if (err < __LIBBPF_ERRNO__END) { |
| 116 | const char *msg; |
| 117 | |
| 118 | msg = libbpf_strerror_table[ERRNO_OFFSET(err)]; |
| 119 | snprintf(buf, size, "%s", msg); |
| 120 | buf[size - 1] = '\0'; |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | snprintf(buf, size, "Unknown libbpf error %d", err); |
| 125 | buf[size - 1] = '\0'; |
| 126 | return -1; |
| 127 | } |
| 128 | |
| 129 | #define CHECK_ERR(action, err, out) do { \ |
| 130 | err = action; \ |
| 131 | if (err) \ |
| 132 | goto out; \ |
| 133 | } while(0) |
| 134 | |
| 135 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 136 | /* Copied from tools/perf/util/util.h */ |
| 137 | #ifndef zfree |
| 138 | # define zfree(ptr) ({ free(*ptr); *ptr = NULL; }) |
| 139 | #endif |
| 140 | |
| 141 | #ifndef zclose |
| 142 | # define zclose(fd) ({ \ |
| 143 | int ___err = 0; \ |
| 144 | if ((fd) >= 0) \ |
| 145 | ___err = close((fd)); \ |
| 146 | fd = -1; \ |
| 147 | ___err; }) |
| 148 | #endif |
| 149 | |
| 150 | #ifdef HAVE_LIBELF_MMAP_SUPPORT |
| 151 | # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ_MMAP |
| 152 | #else |
| 153 | # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ |
| 154 | #endif |
| 155 | |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 156 | /* |
| 157 | * bpf_prog should be a better name but it has been used in |
| 158 | * linux/filter.h. |
| 159 | */ |
| 160 | struct bpf_program { |
| 161 | /* Index in elf obj file, for relocation use. */ |
| 162 | int idx; |
| 163 | char *section_name; |
| 164 | struct bpf_insn *insns; |
| 165 | size_t insns_cnt; |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 166 | enum bpf_prog_type type; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 167 | |
| 168 | struct { |
| 169 | int insn_idx; |
| 170 | int map_idx; |
| 171 | } *reloc_desc; |
| 172 | int nr_reloc; |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 173 | |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 174 | struct { |
| 175 | int nr; |
| 176 | int *fds; |
| 177 | } instances; |
| 178 | bpf_program_prep_t preprocessor; |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 179 | |
| 180 | struct bpf_object *obj; |
| 181 | void *priv; |
| 182 | bpf_program_clear_priv_t clear_priv; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 183 | }; |
| 184 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 185 | struct bpf_map { |
| 186 | int fd; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 187 | char *name; |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 188 | struct bpf_map_def def; |
| 189 | void *priv; |
| 190 | bpf_map_clear_priv_t clear_priv; |
| 191 | }; |
| 192 | |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 193 | static LIST_HEAD(bpf_objects_list); |
| 194 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 195 | struct bpf_object { |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 196 | char license[64]; |
| 197 | u32 kern_version; |
Wang Nan | 0b3d1ef | 2015-07-01 02:13:58 +0000 | [diff] [blame] | 198 | |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 199 | struct bpf_program *programs; |
| 200 | size_t nr_programs; |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 201 | struct bpf_map *maps; |
| 202 | size_t nr_maps; |
| 203 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 204 | bool loaded; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 205 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 206 | /* |
| 207 | * Information when doing elf related work. Only valid if fd |
| 208 | * is valid. |
| 209 | */ |
| 210 | struct { |
| 211 | int fd; |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 212 | void *obj_buf; |
| 213 | size_t obj_buf_sz; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 214 | Elf *elf; |
| 215 | GElf_Ehdr ehdr; |
Wang Nan | bec7d68 | 2015-07-01 02:13:59 +0000 | [diff] [blame] | 216 | Elf_Data *symbols; |
Wang Nan | 77ba9a5 | 2015-12-08 02:25:30 +0000 | [diff] [blame] | 217 | size_t strtabidx; |
Wang Nan | b62f06e | 2015-07-01 02:14:01 +0000 | [diff] [blame] | 218 | struct { |
| 219 | GElf_Shdr shdr; |
| 220 | Elf_Data *data; |
| 221 | } *reloc; |
| 222 | int nr_reloc; |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 223 | int maps_shndx; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 224 | } efile; |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 225 | /* |
| 226 | * All loaded bpf_object is linked in a list, which is |
| 227 | * hidden to caller. bpf_objects__<func> handlers deal with |
| 228 | * all objects. |
| 229 | */ |
| 230 | struct list_head list; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 231 | char path[]; |
| 232 | }; |
| 233 | #define obj_elf_valid(o) ((o)->efile.elf) |
| 234 | |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 235 | static void bpf_program__unload(struct bpf_program *prog) |
| 236 | { |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 237 | int i; |
| 238 | |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 239 | if (!prog) |
| 240 | return; |
| 241 | |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 242 | /* |
| 243 | * If the object is opened but the program was never loaded, |
| 244 | * it is possible that prog->instances.nr == -1. |
| 245 | */ |
| 246 | if (prog->instances.nr > 0) { |
| 247 | for (i = 0; i < prog->instances.nr; i++) |
| 248 | zclose(prog->instances.fds[i]); |
| 249 | } else if (prog->instances.nr != -1) { |
| 250 | pr_warning("Internal error: instances.nr is %d\n", |
| 251 | prog->instances.nr); |
| 252 | } |
| 253 | |
| 254 | prog->instances.nr = -1; |
| 255 | zfree(&prog->instances.fds); |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 256 | } |
| 257 | |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 258 | static void bpf_program__exit(struct bpf_program *prog) |
| 259 | { |
| 260 | if (!prog) |
| 261 | return; |
| 262 | |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 263 | if (prog->clear_priv) |
| 264 | prog->clear_priv(prog, prog->priv); |
| 265 | |
| 266 | prog->priv = NULL; |
| 267 | prog->clear_priv = NULL; |
| 268 | |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 269 | bpf_program__unload(prog); |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 270 | zfree(&prog->section_name); |
| 271 | zfree(&prog->insns); |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 272 | zfree(&prog->reloc_desc); |
| 273 | |
| 274 | prog->nr_reloc = 0; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 275 | prog->insns_cnt = 0; |
| 276 | prog->idx = -1; |
| 277 | } |
| 278 | |
| 279 | static int |
| 280 | bpf_program__init(void *data, size_t size, char *name, int idx, |
| 281 | struct bpf_program *prog) |
| 282 | { |
| 283 | if (size < sizeof(struct bpf_insn)) { |
| 284 | pr_warning("corrupted section '%s'\n", name); |
| 285 | return -EINVAL; |
| 286 | } |
| 287 | |
| 288 | bzero(prog, sizeof(*prog)); |
| 289 | |
| 290 | prog->section_name = strdup(name); |
| 291 | if (!prog->section_name) { |
| 292 | pr_warning("failed to alloc name for prog %s\n", |
| 293 | name); |
| 294 | goto errout; |
| 295 | } |
| 296 | |
| 297 | prog->insns = malloc(size); |
| 298 | if (!prog->insns) { |
| 299 | pr_warning("failed to alloc insns for %s\n", name); |
| 300 | goto errout; |
| 301 | } |
| 302 | prog->insns_cnt = size / sizeof(struct bpf_insn); |
| 303 | memcpy(prog->insns, data, |
| 304 | prog->insns_cnt * sizeof(struct bpf_insn)); |
| 305 | prog->idx = idx; |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 306 | prog->instances.fds = NULL; |
| 307 | prog->instances.nr = -1; |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 308 | prog->type = BPF_PROG_TYPE_KPROBE; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 309 | |
| 310 | return 0; |
| 311 | errout: |
| 312 | bpf_program__exit(prog); |
| 313 | return -ENOMEM; |
| 314 | } |
| 315 | |
| 316 | static int |
| 317 | bpf_object__add_program(struct bpf_object *obj, void *data, size_t size, |
| 318 | char *name, int idx) |
| 319 | { |
| 320 | struct bpf_program prog, *progs; |
| 321 | int nr_progs, err; |
| 322 | |
| 323 | err = bpf_program__init(data, size, name, idx, &prog); |
| 324 | if (err) |
| 325 | return err; |
| 326 | |
| 327 | progs = obj->programs; |
| 328 | nr_progs = obj->nr_programs; |
| 329 | |
| 330 | progs = realloc(progs, sizeof(progs[0]) * (nr_progs + 1)); |
| 331 | if (!progs) { |
| 332 | /* |
| 333 | * In this case the original obj->programs |
| 334 | * is still valid, so don't need special treat for |
| 335 | * bpf_close_object(). |
| 336 | */ |
| 337 | pr_warning("failed to alloc a new program '%s'\n", |
| 338 | name); |
| 339 | bpf_program__exit(&prog); |
| 340 | return -ENOMEM; |
| 341 | } |
| 342 | |
| 343 | pr_debug("found program %s\n", prog.section_name); |
| 344 | obj->programs = progs; |
| 345 | obj->nr_programs = nr_progs + 1; |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 346 | prog.obj = obj; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 347 | progs[nr_progs] = prog; |
| 348 | return 0; |
| 349 | } |
| 350 | |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 351 | static struct bpf_object *bpf_object__new(const char *path, |
| 352 | void *obj_buf, |
| 353 | size_t obj_buf_sz) |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 354 | { |
| 355 | struct bpf_object *obj; |
| 356 | |
| 357 | obj = calloc(1, sizeof(struct bpf_object) + strlen(path) + 1); |
| 358 | if (!obj) { |
| 359 | pr_warning("alloc memory failed for %s\n", path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 360 | return ERR_PTR(-ENOMEM); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 361 | } |
| 362 | |
| 363 | strcpy(obj->path, path); |
| 364 | obj->efile.fd = -1; |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 365 | |
| 366 | /* |
| 367 | * Caller of this function should also calls |
| 368 | * bpf_object__elf_finish() after data collection to return |
| 369 | * obj_buf to user. If not, we should duplicate the buffer to |
| 370 | * avoid user freeing them before elf finish. |
| 371 | */ |
| 372 | obj->efile.obj_buf = obj_buf; |
| 373 | obj->efile.obj_buf_sz = obj_buf_sz; |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 374 | obj->efile.maps_shndx = -1; |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 375 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 376 | obj->loaded = false; |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 377 | |
| 378 | INIT_LIST_HEAD(&obj->list); |
| 379 | list_add(&obj->list, &bpf_objects_list); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 380 | return obj; |
| 381 | } |
| 382 | |
| 383 | static void bpf_object__elf_finish(struct bpf_object *obj) |
| 384 | { |
| 385 | if (!obj_elf_valid(obj)) |
| 386 | return; |
| 387 | |
| 388 | if (obj->efile.elf) { |
| 389 | elf_end(obj->efile.elf); |
| 390 | obj->efile.elf = NULL; |
| 391 | } |
Wang Nan | bec7d68 | 2015-07-01 02:13:59 +0000 | [diff] [blame] | 392 | obj->efile.symbols = NULL; |
Wang Nan | b62f06e | 2015-07-01 02:14:01 +0000 | [diff] [blame] | 393 | |
| 394 | zfree(&obj->efile.reloc); |
| 395 | obj->efile.nr_reloc = 0; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 396 | zclose(obj->efile.fd); |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 397 | obj->efile.obj_buf = NULL; |
| 398 | obj->efile.obj_buf_sz = 0; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 399 | } |
| 400 | |
| 401 | static int bpf_object__elf_init(struct bpf_object *obj) |
| 402 | { |
| 403 | int err = 0; |
| 404 | GElf_Ehdr *ep; |
| 405 | |
| 406 | if (obj_elf_valid(obj)) { |
| 407 | pr_warning("elf init: internal error\n"); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 408 | return -LIBBPF_ERRNO__LIBELF; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 409 | } |
| 410 | |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 411 | if (obj->efile.obj_buf_sz > 0) { |
| 412 | /* |
| 413 | * obj_buf should have been validated by |
| 414 | * bpf_object__open_buffer(). |
| 415 | */ |
| 416 | obj->efile.elf = elf_memory(obj->efile.obj_buf, |
| 417 | obj->efile.obj_buf_sz); |
| 418 | } else { |
| 419 | obj->efile.fd = open(obj->path, O_RDONLY); |
| 420 | if (obj->efile.fd < 0) { |
| 421 | pr_warning("failed to open %s: %s\n", obj->path, |
| 422 | strerror(errno)); |
| 423 | return -errno; |
| 424 | } |
| 425 | |
| 426 | obj->efile.elf = elf_begin(obj->efile.fd, |
| 427 | LIBBPF_ELF_C_READ_MMAP, |
| 428 | NULL); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 429 | } |
| 430 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 431 | if (!obj->efile.elf) { |
| 432 | pr_warning("failed to open %s as ELF file\n", |
| 433 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 434 | err = -LIBBPF_ERRNO__LIBELF; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 435 | goto errout; |
| 436 | } |
| 437 | |
| 438 | if (!gelf_getehdr(obj->efile.elf, &obj->efile.ehdr)) { |
| 439 | pr_warning("failed to get EHDR from %s\n", |
| 440 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 441 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 442 | goto errout; |
| 443 | } |
| 444 | ep = &obj->efile.ehdr; |
| 445 | |
Wang Nan | 9b16137 | 2016-07-18 06:01:08 +0000 | [diff] [blame] | 446 | /* Old LLVM set e_machine to EM_NONE */ |
| 447 | if ((ep->e_type != ET_REL) || (ep->e_machine && (ep->e_machine != EM_BPF))) { |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 448 | pr_warning("%s is not an eBPF object file\n", |
| 449 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 450 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 451 | goto errout; |
| 452 | } |
| 453 | |
| 454 | return 0; |
| 455 | errout: |
| 456 | bpf_object__elf_finish(obj); |
| 457 | return err; |
| 458 | } |
| 459 | |
Wang Nan | cc4228d | 2015-07-01 02:13:55 +0000 | [diff] [blame] | 460 | static int |
| 461 | bpf_object__check_endianness(struct bpf_object *obj) |
| 462 | { |
| 463 | static unsigned int const endian = 1; |
| 464 | |
| 465 | switch (obj->efile.ehdr.e_ident[EI_DATA]) { |
| 466 | case ELFDATA2LSB: |
| 467 | /* We are big endian, BPF obj is little endian. */ |
| 468 | if (*(unsigned char const *)&endian != 1) |
| 469 | goto mismatch; |
| 470 | break; |
| 471 | |
| 472 | case ELFDATA2MSB: |
| 473 | /* We are little endian, BPF obj is big endian. */ |
| 474 | if (*(unsigned char const *)&endian != 0) |
| 475 | goto mismatch; |
| 476 | break; |
| 477 | default: |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 478 | return -LIBBPF_ERRNO__ENDIAN; |
Wang Nan | cc4228d | 2015-07-01 02:13:55 +0000 | [diff] [blame] | 479 | } |
| 480 | |
| 481 | return 0; |
| 482 | |
| 483 | mismatch: |
| 484 | pr_warning("Error: endianness mismatch.\n"); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 485 | return -LIBBPF_ERRNO__ENDIAN; |
Wang Nan | cc4228d | 2015-07-01 02:13:55 +0000 | [diff] [blame] | 486 | } |
| 487 | |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 488 | static int |
| 489 | bpf_object__init_license(struct bpf_object *obj, |
| 490 | void *data, size_t size) |
| 491 | { |
| 492 | memcpy(obj->license, data, |
| 493 | min(size, sizeof(obj->license) - 1)); |
| 494 | pr_debug("license of %s is %s\n", obj->path, obj->license); |
| 495 | return 0; |
| 496 | } |
| 497 | |
| 498 | static int |
| 499 | bpf_object__init_kversion(struct bpf_object *obj, |
| 500 | void *data, size_t size) |
| 501 | { |
| 502 | u32 kver; |
| 503 | |
| 504 | if (size != sizeof(kver)) { |
| 505 | pr_warning("invalid kver section in %s\n", obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 506 | return -LIBBPF_ERRNO__FORMAT; |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 507 | } |
| 508 | memcpy(&kver, data, sizeof(kver)); |
| 509 | obj->kern_version = kver; |
| 510 | pr_debug("kernel version of %s is %x\n", obj->path, |
| 511 | obj->kern_version); |
| 512 | return 0; |
| 513 | } |
| 514 | |
Wang Nan | 0b3d1ef | 2015-07-01 02:13:58 +0000 | [diff] [blame] | 515 | static int |
| 516 | bpf_object__init_maps(struct bpf_object *obj, void *data, |
| 517 | size_t size) |
| 518 | { |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 519 | size_t nr_maps; |
| 520 | int i; |
| 521 | |
| 522 | nr_maps = size / sizeof(struct bpf_map_def); |
| 523 | if (!data || !nr_maps) { |
Wang Nan | 0b3d1ef | 2015-07-01 02:13:58 +0000 | [diff] [blame] | 524 | pr_debug("%s doesn't need map definition\n", |
| 525 | obj->path); |
| 526 | return 0; |
| 527 | } |
| 528 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 529 | pr_debug("maps in %s: %zd bytes\n", obj->path, size); |
| 530 | |
| 531 | obj->maps = calloc(nr_maps, sizeof(obj->maps[0])); |
| 532 | if (!obj->maps) { |
| 533 | pr_warning("alloc maps for object failed\n"); |
Wang Nan | 0b3d1ef | 2015-07-01 02:13:58 +0000 | [diff] [blame] | 534 | return -ENOMEM; |
| 535 | } |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 536 | obj->nr_maps = nr_maps; |
Wang Nan | 0b3d1ef | 2015-07-01 02:13:58 +0000 | [diff] [blame] | 537 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 538 | for (i = 0; i < nr_maps; i++) { |
| 539 | struct bpf_map_def *def = &obj->maps[i].def; |
| 540 | |
| 541 | /* |
| 542 | * fill all fd with -1 so won't close incorrect |
| 543 | * fd (fd=0 is stdin) when failure (zclose won't close |
| 544 | * negative fd)). |
| 545 | */ |
| 546 | obj->maps[i].fd = -1; |
| 547 | |
| 548 | /* Save map definition into obj->maps */ |
| 549 | *def = ((struct bpf_map_def *)data)[i]; |
| 550 | } |
Wang Nan | 0b3d1ef | 2015-07-01 02:13:58 +0000 | [diff] [blame] | 551 | return 0; |
| 552 | } |
| 553 | |
Wang Nan | 973170e | 2015-12-08 02:25:29 +0000 | [diff] [blame] | 554 | static int |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 555 | bpf_object__init_maps_name(struct bpf_object *obj) |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 556 | { |
| 557 | int i; |
| 558 | Elf_Data *symbols = obj->efile.symbols; |
| 559 | |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 560 | if (!symbols || obj->efile.maps_shndx < 0) |
Wang Nan | 973170e | 2015-12-08 02:25:29 +0000 | [diff] [blame] | 561 | return -EINVAL; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 562 | |
| 563 | for (i = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) { |
| 564 | GElf_Sym sym; |
| 565 | size_t map_idx; |
| 566 | const char *map_name; |
| 567 | |
| 568 | if (!gelf_getsym(symbols, i, &sym)) |
| 569 | continue; |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 570 | if (sym.st_shndx != obj->efile.maps_shndx) |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 571 | continue; |
| 572 | |
| 573 | map_name = elf_strptr(obj->efile.elf, |
Wang Nan | 77ba9a5 | 2015-12-08 02:25:30 +0000 | [diff] [blame] | 574 | obj->efile.strtabidx, |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 575 | sym.st_name); |
| 576 | map_idx = sym.st_value / sizeof(struct bpf_map_def); |
| 577 | if (map_idx >= obj->nr_maps) { |
| 578 | pr_warning("index of map \"%s\" is buggy: %zu > %zu\n", |
| 579 | map_name, map_idx, obj->nr_maps); |
| 580 | continue; |
| 581 | } |
| 582 | obj->maps[map_idx].name = strdup(map_name); |
Wang Nan | 973170e | 2015-12-08 02:25:29 +0000 | [diff] [blame] | 583 | if (!obj->maps[map_idx].name) { |
| 584 | pr_warning("failed to alloc map name\n"); |
| 585 | return -ENOMEM; |
| 586 | } |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 587 | pr_debug("map %zu is \"%s\"\n", map_idx, |
| 588 | obj->maps[map_idx].name); |
| 589 | } |
Wang Nan | 973170e | 2015-12-08 02:25:29 +0000 | [diff] [blame] | 590 | return 0; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 591 | } |
| 592 | |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 593 | static int bpf_object__elf_collect(struct bpf_object *obj) |
| 594 | { |
| 595 | Elf *elf = obj->efile.elf; |
| 596 | GElf_Ehdr *ep = &obj->efile.ehdr; |
| 597 | Elf_Scn *scn = NULL; |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 598 | int idx = 0, err = 0; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 599 | |
| 600 | /* Elf is corrupted/truncated, avoid calling elf_strptr. */ |
| 601 | if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) { |
| 602 | pr_warning("failed to get e_shstrndx from %s\n", |
| 603 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 604 | return -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 605 | } |
| 606 | |
| 607 | while ((scn = elf_nextscn(elf, scn)) != NULL) { |
| 608 | char *name; |
| 609 | GElf_Shdr sh; |
| 610 | Elf_Data *data; |
| 611 | |
| 612 | idx++; |
| 613 | if (gelf_getshdr(scn, &sh) != &sh) { |
| 614 | pr_warning("failed to get section header from %s\n", |
| 615 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 616 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 617 | goto out; |
| 618 | } |
| 619 | |
| 620 | name = elf_strptr(elf, ep->e_shstrndx, sh.sh_name); |
| 621 | if (!name) { |
| 622 | pr_warning("failed to get section name from %s\n", |
| 623 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 624 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 625 | goto out; |
| 626 | } |
| 627 | |
| 628 | data = elf_getdata(scn, 0); |
| 629 | if (!data) { |
| 630 | pr_warning("failed to get section data from %s(%s)\n", |
| 631 | name, obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 632 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 633 | goto out; |
| 634 | } |
| 635 | pr_debug("section %s, size %ld, link %d, flags %lx, type=%d\n", |
| 636 | name, (unsigned long)data->d_size, |
| 637 | (int)sh.sh_link, (unsigned long)sh.sh_flags, |
| 638 | (int)sh.sh_type); |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 639 | |
| 640 | if (strcmp(name, "license") == 0) |
| 641 | err = bpf_object__init_license(obj, |
| 642 | data->d_buf, |
| 643 | data->d_size); |
| 644 | else if (strcmp(name, "version") == 0) |
| 645 | err = bpf_object__init_kversion(obj, |
| 646 | data->d_buf, |
| 647 | data->d_size); |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 648 | else if (strcmp(name, "maps") == 0) { |
Wang Nan | 0b3d1ef | 2015-07-01 02:13:58 +0000 | [diff] [blame] | 649 | err = bpf_object__init_maps(obj, data->d_buf, |
| 650 | data->d_size); |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 651 | obj->efile.maps_shndx = idx; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 652 | } else if (sh.sh_type == SHT_SYMTAB) { |
Wang Nan | bec7d68 | 2015-07-01 02:13:59 +0000 | [diff] [blame] | 653 | if (obj->efile.symbols) { |
| 654 | pr_warning("bpf: multiple SYMTAB in %s\n", |
| 655 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 656 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 77ba9a5 | 2015-12-08 02:25:30 +0000 | [diff] [blame] | 657 | } else { |
Wang Nan | bec7d68 | 2015-07-01 02:13:59 +0000 | [diff] [blame] | 658 | obj->efile.symbols = data; |
Wang Nan | 77ba9a5 | 2015-12-08 02:25:30 +0000 | [diff] [blame] | 659 | obj->efile.strtabidx = sh.sh_link; |
| 660 | } |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 661 | } else if ((sh.sh_type == SHT_PROGBITS) && |
| 662 | (sh.sh_flags & SHF_EXECINSTR) && |
| 663 | (data->d_size > 0)) { |
| 664 | err = bpf_object__add_program(obj, data->d_buf, |
| 665 | data->d_size, name, idx); |
| 666 | if (err) { |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 667 | char errmsg[STRERR_BUFSIZE]; |
| 668 | |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 669 | strerror_r(-err, errmsg, sizeof(errmsg)); |
| 670 | pr_warning("failed to alloc program %s (%s): %s", |
| 671 | name, obj->path, errmsg); |
| 672 | } |
Wang Nan | b62f06e | 2015-07-01 02:14:01 +0000 | [diff] [blame] | 673 | } else if (sh.sh_type == SHT_REL) { |
| 674 | void *reloc = obj->efile.reloc; |
| 675 | int nr_reloc = obj->efile.nr_reloc + 1; |
| 676 | |
| 677 | reloc = realloc(reloc, |
| 678 | sizeof(*obj->efile.reloc) * nr_reloc); |
| 679 | if (!reloc) { |
| 680 | pr_warning("realloc failed\n"); |
| 681 | err = -ENOMEM; |
| 682 | } else { |
| 683 | int n = nr_reloc - 1; |
| 684 | |
| 685 | obj->efile.reloc = reloc; |
| 686 | obj->efile.nr_reloc = nr_reloc; |
| 687 | |
| 688 | obj->efile.reloc[n].shdr = sh; |
| 689 | obj->efile.reloc[n].data = data; |
| 690 | } |
Wang Nan | bec7d68 | 2015-07-01 02:13:59 +0000 | [diff] [blame] | 691 | } |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 692 | if (err) |
| 693 | goto out; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 694 | } |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 695 | |
Wang Nan | 77ba9a5 | 2015-12-08 02:25:30 +0000 | [diff] [blame] | 696 | if (!obj->efile.strtabidx || obj->efile.strtabidx >= idx) { |
| 697 | pr_warning("Corrupted ELF file: index of strtab invalid\n"); |
| 698 | return LIBBPF_ERRNO__FORMAT; |
| 699 | } |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 700 | if (obj->efile.maps_shndx >= 0) |
| 701 | err = bpf_object__init_maps_name(obj); |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 702 | out: |
| 703 | return err; |
| 704 | } |
| 705 | |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 706 | static struct bpf_program * |
| 707 | bpf_object__find_prog_by_idx(struct bpf_object *obj, int idx) |
| 708 | { |
| 709 | struct bpf_program *prog; |
| 710 | size_t i; |
| 711 | |
| 712 | for (i = 0; i < obj->nr_programs; i++) { |
| 713 | prog = &obj->programs[i]; |
| 714 | if (prog->idx == idx) |
| 715 | return prog; |
| 716 | } |
| 717 | return NULL; |
| 718 | } |
| 719 | |
| 720 | static int |
| 721 | bpf_program__collect_reloc(struct bpf_program *prog, |
| 722 | size_t nr_maps, GElf_Shdr *shdr, |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 723 | Elf_Data *data, Elf_Data *symbols, |
| 724 | int maps_shndx) |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 725 | { |
| 726 | int i, nrels; |
| 727 | |
| 728 | pr_debug("collecting relocating info for: '%s'\n", |
| 729 | prog->section_name); |
| 730 | nrels = shdr->sh_size / shdr->sh_entsize; |
| 731 | |
| 732 | prog->reloc_desc = malloc(sizeof(*prog->reloc_desc) * nrels); |
| 733 | if (!prog->reloc_desc) { |
| 734 | pr_warning("failed to alloc memory in relocation\n"); |
| 735 | return -ENOMEM; |
| 736 | } |
| 737 | prog->nr_reloc = nrels; |
| 738 | |
| 739 | for (i = 0; i < nrels; i++) { |
| 740 | GElf_Sym sym; |
| 741 | GElf_Rel rel; |
| 742 | unsigned int insn_idx; |
| 743 | struct bpf_insn *insns = prog->insns; |
| 744 | size_t map_idx; |
| 745 | |
| 746 | if (!gelf_getrel(data, i, &rel)) { |
| 747 | pr_warning("relocation: failed to get %d reloc\n", i); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 748 | return -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 749 | } |
| 750 | |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 751 | if (!gelf_getsym(symbols, |
| 752 | GELF_R_SYM(rel.r_info), |
| 753 | &sym)) { |
| 754 | pr_warning("relocation: symbol %"PRIx64" not found\n", |
| 755 | GELF_R_SYM(rel.r_info)); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 756 | return -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 757 | } |
| 758 | |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 759 | if (sym.st_shndx != maps_shndx) { |
| 760 | pr_warning("Program '%s' contains non-map related relo data pointing to section %u\n", |
| 761 | prog->section_name, sym.st_shndx); |
| 762 | return -LIBBPF_ERRNO__RELOC; |
| 763 | } |
| 764 | |
| 765 | insn_idx = rel.r_offset / sizeof(struct bpf_insn); |
| 766 | pr_debug("relocation: insn_idx=%u\n", insn_idx); |
| 767 | |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 768 | if (insns[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) { |
| 769 | pr_warning("bpf: relocation: invalid relo for insns[%d].code 0x%x\n", |
| 770 | insn_idx, insns[insn_idx].code); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 771 | return -LIBBPF_ERRNO__RELOC; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 772 | } |
| 773 | |
| 774 | map_idx = sym.st_value / sizeof(struct bpf_map_def); |
| 775 | if (map_idx >= nr_maps) { |
| 776 | pr_warning("bpf relocation: map_idx %d large than %d\n", |
| 777 | (int)map_idx, (int)nr_maps - 1); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 778 | return -LIBBPF_ERRNO__RELOC; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 779 | } |
| 780 | |
| 781 | prog->reloc_desc[i].insn_idx = insn_idx; |
| 782 | prog->reloc_desc[i].map_idx = map_idx; |
| 783 | } |
| 784 | return 0; |
| 785 | } |
| 786 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 787 | static int |
| 788 | bpf_object__create_maps(struct bpf_object *obj) |
| 789 | { |
| 790 | unsigned int i; |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 791 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 792 | for (i = 0; i < obj->nr_maps; i++) { |
| 793 | struct bpf_map_def *def = &obj->maps[i].def; |
| 794 | int *pfd = &obj->maps[i].fd; |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 795 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 796 | *pfd = bpf_create_map(def->type, |
| 797 | def->key_size, |
| 798 | def->value_size, |
| 799 | def->max_entries); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 800 | if (*pfd < 0) { |
| 801 | size_t j; |
| 802 | int err = *pfd; |
| 803 | |
| 804 | pr_warning("failed to create map: %s\n", |
| 805 | strerror(errno)); |
| 806 | for (j = 0; j < i; j++) |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 807 | zclose(obj->maps[j].fd); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 808 | return err; |
| 809 | } |
| 810 | pr_debug("create map: fd=%d\n", *pfd); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 811 | } |
| 812 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 813 | return 0; |
| 814 | } |
| 815 | |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 816 | static int |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 817 | bpf_program__relocate(struct bpf_program *prog, struct bpf_object *obj) |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 818 | { |
| 819 | int i; |
| 820 | |
| 821 | if (!prog || !prog->reloc_desc) |
| 822 | return 0; |
| 823 | |
| 824 | for (i = 0; i < prog->nr_reloc; i++) { |
| 825 | int insn_idx, map_idx; |
| 826 | struct bpf_insn *insns = prog->insns; |
| 827 | |
| 828 | insn_idx = prog->reloc_desc[i].insn_idx; |
| 829 | map_idx = prog->reloc_desc[i].map_idx; |
| 830 | |
| 831 | if (insn_idx >= (int)prog->insns_cnt) { |
| 832 | pr_warning("relocation out of range: '%s'\n", |
| 833 | prog->section_name); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 834 | return -LIBBPF_ERRNO__RELOC; |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 835 | } |
| 836 | insns[insn_idx].src_reg = BPF_PSEUDO_MAP_FD; |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 837 | insns[insn_idx].imm = obj->maps[map_idx].fd; |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 838 | } |
| 839 | |
| 840 | zfree(&prog->reloc_desc); |
| 841 | prog->nr_reloc = 0; |
| 842 | return 0; |
| 843 | } |
| 844 | |
| 845 | |
| 846 | static int |
| 847 | bpf_object__relocate(struct bpf_object *obj) |
| 848 | { |
| 849 | struct bpf_program *prog; |
| 850 | size_t i; |
| 851 | int err; |
| 852 | |
| 853 | for (i = 0; i < obj->nr_programs; i++) { |
| 854 | prog = &obj->programs[i]; |
| 855 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 856 | err = bpf_program__relocate(prog, obj); |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 857 | if (err) { |
| 858 | pr_warning("failed to relocate '%s'\n", |
| 859 | prog->section_name); |
| 860 | return err; |
| 861 | } |
| 862 | } |
| 863 | return 0; |
| 864 | } |
| 865 | |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 866 | static int bpf_object__collect_reloc(struct bpf_object *obj) |
| 867 | { |
| 868 | int i, err; |
| 869 | |
| 870 | if (!obj_elf_valid(obj)) { |
| 871 | pr_warning("Internal error: elf object is closed\n"); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 872 | return -LIBBPF_ERRNO__INTERNAL; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 873 | } |
| 874 | |
| 875 | for (i = 0; i < obj->efile.nr_reloc; i++) { |
| 876 | GElf_Shdr *shdr = &obj->efile.reloc[i].shdr; |
| 877 | Elf_Data *data = obj->efile.reloc[i].data; |
| 878 | int idx = shdr->sh_info; |
| 879 | struct bpf_program *prog; |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 880 | size_t nr_maps = obj->nr_maps; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 881 | |
| 882 | if (shdr->sh_type != SHT_REL) { |
| 883 | pr_warning("internal error at %d\n", __LINE__); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 884 | return -LIBBPF_ERRNO__INTERNAL; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 885 | } |
| 886 | |
| 887 | prog = bpf_object__find_prog_by_idx(obj, idx); |
| 888 | if (!prog) { |
| 889 | pr_warning("relocation failed: no %d section\n", |
| 890 | idx); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 891 | return -LIBBPF_ERRNO__RELOC; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 892 | } |
| 893 | |
| 894 | err = bpf_program__collect_reloc(prog, nr_maps, |
| 895 | shdr, data, |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 896 | obj->efile.symbols, |
| 897 | obj->efile.maps_shndx); |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 898 | if (err) |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 899 | return err; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 900 | } |
| 901 | return 0; |
| 902 | } |
| 903 | |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 904 | static int |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 905 | load_program(enum bpf_prog_type type, struct bpf_insn *insns, |
| 906 | int insns_cnt, char *license, u32 kern_version, int *pfd) |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 907 | { |
| 908 | int ret; |
| 909 | char *log_buf; |
| 910 | |
| 911 | if (!insns || !insns_cnt) |
| 912 | return -EINVAL; |
| 913 | |
| 914 | log_buf = malloc(BPF_LOG_BUF_SIZE); |
| 915 | if (!log_buf) |
| 916 | pr_warning("Alloc log buffer for bpf loader error, continue without log\n"); |
| 917 | |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 918 | ret = bpf_load_program(type, insns, insns_cnt, license, |
| 919 | kern_version, log_buf, BPF_LOG_BUF_SIZE); |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 920 | |
| 921 | if (ret >= 0) { |
| 922 | *pfd = ret; |
| 923 | ret = 0; |
| 924 | goto out; |
| 925 | } |
| 926 | |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 927 | ret = -LIBBPF_ERRNO__LOAD; |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 928 | pr_warning("load bpf program failed: %s\n", strerror(errno)); |
| 929 | |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 930 | if (log_buf && log_buf[0] != '\0') { |
| 931 | ret = -LIBBPF_ERRNO__VERIFY; |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 932 | pr_warning("-- BEGIN DUMP LOG ---\n"); |
| 933 | pr_warning("\n%s\n", log_buf); |
| 934 | pr_warning("-- END LOG --\n"); |
Wang Nan | 705fa21 | 2016-07-13 10:44:02 +0000 | [diff] [blame] | 935 | } else if (insns_cnt >= BPF_MAXINSNS) { |
| 936 | pr_warning("Program too large (%d insns), at most %d insns\n", |
| 937 | insns_cnt, BPF_MAXINSNS); |
| 938 | ret = -LIBBPF_ERRNO__PROG2BIG; |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 939 | } else { |
Wang Nan | 705fa21 | 2016-07-13 10:44:02 +0000 | [diff] [blame] | 940 | /* Wrong program type? */ |
| 941 | if (type != BPF_PROG_TYPE_KPROBE) { |
| 942 | int fd; |
| 943 | |
| 944 | fd = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns, |
| 945 | insns_cnt, license, kern_version, |
| 946 | NULL, 0); |
| 947 | if (fd >= 0) { |
| 948 | close(fd); |
| 949 | ret = -LIBBPF_ERRNO__PROGTYPE; |
| 950 | goto out; |
| 951 | } |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 952 | } |
Wang Nan | 705fa21 | 2016-07-13 10:44:02 +0000 | [diff] [blame] | 953 | |
| 954 | if (log_buf) |
| 955 | ret = -LIBBPF_ERRNO__KVER; |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 956 | } |
| 957 | |
| 958 | out: |
| 959 | free(log_buf); |
| 960 | return ret; |
| 961 | } |
| 962 | |
| 963 | static int |
| 964 | bpf_program__load(struct bpf_program *prog, |
| 965 | char *license, u32 kern_version) |
| 966 | { |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 967 | int err = 0, fd, i; |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 968 | |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 969 | if (prog->instances.nr < 0 || !prog->instances.fds) { |
| 970 | if (prog->preprocessor) { |
| 971 | pr_warning("Internal error: can't load program '%s'\n", |
| 972 | prog->section_name); |
| 973 | return -LIBBPF_ERRNO__INTERNAL; |
| 974 | } |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 975 | |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 976 | prog->instances.fds = malloc(sizeof(int)); |
| 977 | if (!prog->instances.fds) { |
| 978 | pr_warning("Not enough memory for BPF fds\n"); |
| 979 | return -ENOMEM; |
| 980 | } |
| 981 | prog->instances.nr = 1; |
| 982 | prog->instances.fds[0] = -1; |
| 983 | } |
| 984 | |
| 985 | if (!prog->preprocessor) { |
| 986 | if (prog->instances.nr != 1) { |
| 987 | pr_warning("Program '%s' is inconsistent: nr(%d) != 1\n", |
| 988 | prog->section_name, prog->instances.nr); |
| 989 | } |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 990 | err = load_program(prog->type, prog->insns, prog->insns_cnt, |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 991 | license, kern_version, &fd); |
| 992 | if (!err) |
| 993 | prog->instances.fds[0] = fd; |
| 994 | goto out; |
| 995 | } |
| 996 | |
| 997 | for (i = 0; i < prog->instances.nr; i++) { |
| 998 | struct bpf_prog_prep_result result; |
| 999 | bpf_program_prep_t preprocessor = prog->preprocessor; |
| 1000 | |
| 1001 | bzero(&result, sizeof(result)); |
| 1002 | err = preprocessor(prog, i, prog->insns, |
| 1003 | prog->insns_cnt, &result); |
| 1004 | if (err) { |
| 1005 | pr_warning("Preprocessing the %dth instance of program '%s' failed\n", |
| 1006 | i, prog->section_name); |
| 1007 | goto out; |
| 1008 | } |
| 1009 | |
| 1010 | if (!result.new_insn_ptr || !result.new_insn_cnt) { |
| 1011 | pr_debug("Skip loading the %dth instance of program '%s'\n", |
| 1012 | i, prog->section_name); |
| 1013 | prog->instances.fds[i] = -1; |
| 1014 | if (result.pfd) |
| 1015 | *result.pfd = -1; |
| 1016 | continue; |
| 1017 | } |
| 1018 | |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 1019 | err = load_program(prog->type, result.new_insn_ptr, |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 1020 | result.new_insn_cnt, |
| 1021 | license, kern_version, &fd); |
| 1022 | |
| 1023 | if (err) { |
| 1024 | pr_warning("Loading the %dth instance of program '%s' failed\n", |
| 1025 | i, prog->section_name); |
| 1026 | goto out; |
| 1027 | } |
| 1028 | |
| 1029 | if (result.pfd) |
| 1030 | *result.pfd = fd; |
| 1031 | prog->instances.fds[i] = fd; |
| 1032 | } |
| 1033 | out: |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1034 | if (err) |
| 1035 | pr_warning("failed to load program '%s'\n", |
| 1036 | prog->section_name); |
| 1037 | zfree(&prog->insns); |
| 1038 | prog->insns_cnt = 0; |
| 1039 | return err; |
| 1040 | } |
| 1041 | |
| 1042 | static int |
| 1043 | bpf_object__load_progs(struct bpf_object *obj) |
| 1044 | { |
| 1045 | size_t i; |
| 1046 | int err; |
| 1047 | |
| 1048 | for (i = 0; i < obj->nr_programs; i++) { |
| 1049 | err = bpf_program__load(&obj->programs[i], |
| 1050 | obj->license, |
| 1051 | obj->kern_version); |
| 1052 | if (err) |
| 1053 | return err; |
| 1054 | } |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 1058 | static int bpf_object__validate(struct bpf_object *obj) |
| 1059 | { |
| 1060 | if (obj->kern_version == 0) { |
| 1061 | pr_warning("%s doesn't provide kernel version\n", |
| 1062 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1063 | return -LIBBPF_ERRNO__KVERSION; |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 1064 | } |
| 1065 | return 0; |
| 1066 | } |
| 1067 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1068 | static struct bpf_object * |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1069 | __bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz) |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1070 | { |
| 1071 | struct bpf_object *obj; |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1072 | int err; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1073 | |
| 1074 | if (elf_version(EV_CURRENT) == EV_NONE) { |
| 1075 | pr_warning("failed to init libelf for %s\n", path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1076 | return ERR_PTR(-LIBBPF_ERRNO__LIBELF); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1077 | } |
| 1078 | |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1079 | obj = bpf_object__new(path, obj_buf, obj_buf_sz); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1080 | if (IS_ERR(obj)) |
| 1081 | return obj; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1082 | |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1083 | CHECK_ERR(bpf_object__elf_init(obj), err, out); |
| 1084 | CHECK_ERR(bpf_object__check_endianness(obj), err, out); |
| 1085 | CHECK_ERR(bpf_object__elf_collect(obj), err, out); |
| 1086 | CHECK_ERR(bpf_object__collect_reloc(obj), err, out); |
| 1087 | CHECK_ERR(bpf_object__validate(obj), err, out); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1088 | |
| 1089 | bpf_object__elf_finish(obj); |
| 1090 | return obj; |
| 1091 | out: |
| 1092 | bpf_object__close(obj); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1093 | return ERR_PTR(err); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1094 | } |
| 1095 | |
| 1096 | struct bpf_object *bpf_object__open(const char *path) |
| 1097 | { |
| 1098 | /* param validation */ |
| 1099 | if (!path) |
| 1100 | return NULL; |
| 1101 | |
| 1102 | pr_debug("loading %s\n", path); |
| 1103 | |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1104 | return __bpf_object__open(path, NULL, 0); |
| 1105 | } |
| 1106 | |
| 1107 | struct bpf_object *bpf_object__open_buffer(void *obj_buf, |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1108 | size_t obj_buf_sz, |
| 1109 | const char *name) |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1110 | { |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1111 | char tmp_name[64]; |
| 1112 | |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1113 | /* param validation */ |
| 1114 | if (!obj_buf || obj_buf_sz <= 0) |
| 1115 | return NULL; |
| 1116 | |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1117 | if (!name) { |
| 1118 | snprintf(tmp_name, sizeof(tmp_name), "%lx-%lx", |
| 1119 | (unsigned long)obj_buf, |
| 1120 | (unsigned long)obj_buf_sz); |
| 1121 | tmp_name[sizeof(tmp_name) - 1] = '\0'; |
| 1122 | name = tmp_name; |
| 1123 | } |
| 1124 | pr_debug("loading object '%s' from buffer\n", |
| 1125 | name); |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1126 | |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1127 | return __bpf_object__open(name, obj_buf, obj_buf_sz); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1128 | } |
| 1129 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1130 | int bpf_object__unload(struct bpf_object *obj) |
| 1131 | { |
| 1132 | size_t i; |
| 1133 | |
| 1134 | if (!obj) |
| 1135 | return -EINVAL; |
| 1136 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1137 | for (i = 0; i < obj->nr_maps; i++) |
| 1138 | zclose(obj->maps[i].fd); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1139 | |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1140 | for (i = 0; i < obj->nr_programs; i++) |
| 1141 | bpf_program__unload(&obj->programs[i]); |
| 1142 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1143 | return 0; |
| 1144 | } |
| 1145 | |
| 1146 | int bpf_object__load(struct bpf_object *obj) |
| 1147 | { |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1148 | int err; |
| 1149 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1150 | if (!obj) |
| 1151 | return -EINVAL; |
| 1152 | |
| 1153 | if (obj->loaded) { |
| 1154 | pr_warning("object should not be loaded twice\n"); |
| 1155 | return -EINVAL; |
| 1156 | } |
| 1157 | |
| 1158 | obj->loaded = true; |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1159 | |
| 1160 | CHECK_ERR(bpf_object__create_maps(obj), err, out); |
| 1161 | CHECK_ERR(bpf_object__relocate(obj), err, out); |
| 1162 | CHECK_ERR(bpf_object__load_progs(obj), err, out); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1163 | |
| 1164 | return 0; |
| 1165 | out: |
| 1166 | bpf_object__unload(obj); |
| 1167 | pr_warning("failed to load object '%s'\n", obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1168 | return err; |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1169 | } |
| 1170 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1171 | void bpf_object__close(struct bpf_object *obj) |
| 1172 | { |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 1173 | size_t i; |
| 1174 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1175 | if (!obj) |
| 1176 | return; |
| 1177 | |
| 1178 | bpf_object__elf_finish(obj); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1179 | bpf_object__unload(obj); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1180 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1181 | for (i = 0; i < obj->nr_maps; i++) { |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 1182 | zfree(&obj->maps[i].name); |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1183 | if (obj->maps[i].clear_priv) |
| 1184 | obj->maps[i].clear_priv(&obj->maps[i], |
| 1185 | obj->maps[i].priv); |
| 1186 | obj->maps[i].priv = NULL; |
| 1187 | obj->maps[i].clear_priv = NULL; |
| 1188 | } |
| 1189 | zfree(&obj->maps); |
| 1190 | obj->nr_maps = 0; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 1191 | |
| 1192 | if (obj->programs && obj->nr_programs) { |
| 1193 | for (i = 0; i < obj->nr_programs; i++) |
| 1194 | bpf_program__exit(&obj->programs[i]); |
| 1195 | } |
| 1196 | zfree(&obj->programs); |
| 1197 | |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 1198 | list_del(&obj->list); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1199 | free(obj); |
| 1200 | } |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1201 | |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 1202 | struct bpf_object * |
| 1203 | bpf_object__next(struct bpf_object *prev) |
| 1204 | { |
| 1205 | struct bpf_object *next; |
| 1206 | |
| 1207 | if (!prev) |
| 1208 | next = list_first_entry(&bpf_objects_list, |
| 1209 | struct bpf_object, |
| 1210 | list); |
| 1211 | else |
| 1212 | next = list_next_entry(prev, list); |
| 1213 | |
| 1214 | /* Empty list is noticed here so don't need checking on entry. */ |
| 1215 | if (&next->list == &bpf_objects_list) |
| 1216 | return NULL; |
| 1217 | |
| 1218 | return next; |
| 1219 | } |
| 1220 | |
Arnaldo Carvalho de Melo | a7fe045 | 2016-06-03 12:22:51 -0300 | [diff] [blame] | 1221 | const char *bpf_object__name(struct bpf_object *obj) |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1222 | { |
Arnaldo Carvalho de Melo | a7fe045 | 2016-06-03 12:22:51 -0300 | [diff] [blame] | 1223 | return obj ? obj->path : ERR_PTR(-EINVAL); |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1224 | } |
| 1225 | |
Arnaldo Carvalho de Melo | a7fe045 | 2016-06-03 12:22:51 -0300 | [diff] [blame] | 1226 | unsigned int bpf_object__kversion(struct bpf_object *obj) |
Wang Nan | 45825d8 | 2015-11-06 13:49:38 +0000 | [diff] [blame] | 1227 | { |
Arnaldo Carvalho de Melo | a7fe045 | 2016-06-03 12:22:51 -0300 | [diff] [blame] | 1228 | return obj ? obj->kern_version : 0; |
Wang Nan | 45825d8 | 2015-11-06 13:49:38 +0000 | [diff] [blame] | 1229 | } |
| 1230 | |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1231 | struct bpf_program * |
| 1232 | bpf_program__next(struct bpf_program *prev, struct bpf_object *obj) |
| 1233 | { |
| 1234 | size_t idx; |
| 1235 | |
| 1236 | if (!obj->programs) |
| 1237 | return NULL; |
| 1238 | /* First handler */ |
| 1239 | if (prev == NULL) |
| 1240 | return &obj->programs[0]; |
| 1241 | |
| 1242 | if (prev->obj != obj) { |
| 1243 | pr_warning("error: program handler doesn't match object\n"); |
| 1244 | return NULL; |
| 1245 | } |
| 1246 | |
| 1247 | idx = (prev - obj->programs) + 1; |
| 1248 | if (idx >= obj->nr_programs) |
| 1249 | return NULL; |
| 1250 | return &obj->programs[idx]; |
| 1251 | } |
| 1252 | |
Arnaldo Carvalho de Melo | edb13ed | 2016-06-03 12:38:21 -0300 | [diff] [blame] | 1253 | int bpf_program__set_priv(struct bpf_program *prog, void *priv, |
| 1254 | bpf_program_clear_priv_t clear_priv) |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1255 | { |
| 1256 | if (prog->priv && prog->clear_priv) |
| 1257 | prog->clear_priv(prog, prog->priv); |
| 1258 | |
| 1259 | prog->priv = priv; |
| 1260 | prog->clear_priv = clear_priv; |
| 1261 | return 0; |
| 1262 | } |
| 1263 | |
Arnaldo Carvalho de Melo | be834ff | 2016-06-03 12:36:39 -0300 | [diff] [blame] | 1264 | void *bpf_program__priv(struct bpf_program *prog) |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1265 | { |
Arnaldo Carvalho de Melo | be834ff | 2016-06-03 12:36:39 -0300 | [diff] [blame] | 1266 | return prog ? prog->priv : ERR_PTR(-EINVAL); |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1267 | } |
| 1268 | |
Namhyung Kim | 715f8db | 2015-11-03 20:21:05 +0900 | [diff] [blame] | 1269 | const char *bpf_program__title(struct bpf_program *prog, bool needs_copy) |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1270 | { |
| 1271 | const char *title; |
| 1272 | |
| 1273 | title = prog->section_name; |
Namhyung Kim | 715f8db | 2015-11-03 20:21:05 +0900 | [diff] [blame] | 1274 | if (needs_copy) { |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1275 | title = strdup(title); |
| 1276 | if (!title) { |
| 1277 | pr_warning("failed to strdup program title\n"); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1278 | return ERR_PTR(-ENOMEM); |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1279 | } |
| 1280 | } |
| 1281 | |
| 1282 | return title; |
| 1283 | } |
| 1284 | |
| 1285 | int bpf_program__fd(struct bpf_program *prog) |
| 1286 | { |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 1287 | return bpf_program__nth_fd(prog, 0); |
| 1288 | } |
| 1289 | |
| 1290 | int bpf_program__set_prep(struct bpf_program *prog, int nr_instances, |
| 1291 | bpf_program_prep_t prep) |
| 1292 | { |
| 1293 | int *instances_fds; |
| 1294 | |
| 1295 | if (nr_instances <= 0 || !prep) |
| 1296 | return -EINVAL; |
| 1297 | |
| 1298 | if (prog->instances.nr > 0 || prog->instances.fds) { |
| 1299 | pr_warning("Can't set pre-processor after loading\n"); |
| 1300 | return -EINVAL; |
| 1301 | } |
| 1302 | |
| 1303 | instances_fds = malloc(sizeof(int) * nr_instances); |
| 1304 | if (!instances_fds) { |
| 1305 | pr_warning("alloc memory failed for fds\n"); |
| 1306 | return -ENOMEM; |
| 1307 | } |
| 1308 | |
| 1309 | /* fill all fd with -1 */ |
| 1310 | memset(instances_fds, -1, sizeof(int) * nr_instances); |
| 1311 | |
| 1312 | prog->instances.nr = nr_instances; |
| 1313 | prog->instances.fds = instances_fds; |
| 1314 | prog->preprocessor = prep; |
| 1315 | return 0; |
| 1316 | } |
| 1317 | |
| 1318 | int bpf_program__nth_fd(struct bpf_program *prog, int n) |
| 1319 | { |
| 1320 | int fd; |
| 1321 | |
| 1322 | if (n >= prog->instances.nr || n < 0) { |
| 1323 | pr_warning("Can't get the %dth fd from program %s: only %d instances\n", |
| 1324 | n, prog->section_name, prog->instances.nr); |
| 1325 | return -EINVAL; |
| 1326 | } |
| 1327 | |
| 1328 | fd = prog->instances.fds[n]; |
| 1329 | if (fd < 0) { |
| 1330 | pr_warning("%dth instance of program '%s' is invalid\n", |
| 1331 | n, prog->section_name); |
| 1332 | return -ENOENT; |
| 1333 | } |
| 1334 | |
| 1335 | return fd; |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1336 | } |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1337 | |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 1338 | static void bpf_program__set_type(struct bpf_program *prog, |
| 1339 | enum bpf_prog_type type) |
| 1340 | { |
| 1341 | prog->type = type; |
| 1342 | } |
| 1343 | |
| 1344 | int bpf_program__set_tracepoint(struct bpf_program *prog) |
| 1345 | { |
| 1346 | if (!prog) |
| 1347 | return -EINVAL; |
| 1348 | bpf_program__set_type(prog, BPF_PROG_TYPE_TRACEPOINT); |
| 1349 | return 0; |
| 1350 | } |
| 1351 | |
| 1352 | int bpf_program__set_kprobe(struct bpf_program *prog) |
| 1353 | { |
| 1354 | if (!prog) |
| 1355 | return -EINVAL; |
| 1356 | bpf_program__set_type(prog, BPF_PROG_TYPE_KPROBE); |
| 1357 | return 0; |
| 1358 | } |
| 1359 | |
| 1360 | static bool bpf_program__is_type(struct bpf_program *prog, |
| 1361 | enum bpf_prog_type type) |
| 1362 | { |
| 1363 | return prog ? (prog->type == type) : false; |
| 1364 | } |
| 1365 | |
| 1366 | bool bpf_program__is_tracepoint(struct bpf_program *prog) |
| 1367 | { |
| 1368 | return bpf_program__is_type(prog, BPF_PROG_TYPE_TRACEPOINT); |
| 1369 | } |
| 1370 | |
| 1371 | bool bpf_program__is_kprobe(struct bpf_program *prog) |
| 1372 | { |
| 1373 | return bpf_program__is_type(prog, BPF_PROG_TYPE_KPROBE); |
| 1374 | } |
| 1375 | |
Arnaldo Carvalho de Melo | 6e009e65 | 2016-06-03 12:15:52 -0300 | [diff] [blame] | 1376 | int bpf_map__fd(struct bpf_map *map) |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1377 | { |
Arnaldo Carvalho de Melo | 6e009e65 | 2016-06-03 12:15:52 -0300 | [diff] [blame] | 1378 | return map ? map->fd : -EINVAL; |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1379 | } |
| 1380 | |
Arnaldo Carvalho de Melo | 53897a7 | 2016-06-02 14:21:06 -0300 | [diff] [blame] | 1381 | const struct bpf_map_def *bpf_map__def(struct bpf_map *map) |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1382 | { |
Arnaldo Carvalho de Melo | 53897a7 | 2016-06-02 14:21:06 -0300 | [diff] [blame] | 1383 | return map ? &map->def : ERR_PTR(-EINVAL); |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1384 | } |
| 1385 | |
Arnaldo Carvalho de Melo | 009ad5d | 2016-06-02 11:02:05 -0300 | [diff] [blame] | 1386 | const char *bpf_map__name(struct bpf_map *map) |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 1387 | { |
Arnaldo Carvalho de Melo | 009ad5d | 2016-06-02 11:02:05 -0300 | [diff] [blame] | 1388 | return map ? map->name : NULL; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 1389 | } |
| 1390 | |
Arnaldo Carvalho de Melo | edb13ed | 2016-06-03 12:38:21 -0300 | [diff] [blame] | 1391 | int bpf_map__set_priv(struct bpf_map *map, void *priv, |
| 1392 | bpf_map_clear_priv_t clear_priv) |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1393 | { |
| 1394 | if (!map) |
| 1395 | return -EINVAL; |
| 1396 | |
| 1397 | if (map->priv) { |
| 1398 | if (map->clear_priv) |
| 1399 | map->clear_priv(map, map->priv); |
| 1400 | } |
| 1401 | |
| 1402 | map->priv = priv; |
| 1403 | map->clear_priv = clear_priv; |
| 1404 | return 0; |
| 1405 | } |
| 1406 | |
Arnaldo Carvalho de Melo | b4cbfa5 | 2016-06-02 10:51:59 -0300 | [diff] [blame] | 1407 | void *bpf_map__priv(struct bpf_map *map) |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1408 | { |
Arnaldo Carvalho de Melo | b4cbfa5 | 2016-06-02 10:51:59 -0300 | [diff] [blame] | 1409 | return map ? map->priv : ERR_PTR(-EINVAL); |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1410 | } |
| 1411 | |
| 1412 | struct bpf_map * |
| 1413 | bpf_map__next(struct bpf_map *prev, struct bpf_object *obj) |
| 1414 | { |
| 1415 | size_t idx; |
| 1416 | struct bpf_map *s, *e; |
| 1417 | |
| 1418 | if (!obj || !obj->maps) |
| 1419 | return NULL; |
| 1420 | |
| 1421 | s = obj->maps; |
| 1422 | e = obj->maps + obj->nr_maps; |
| 1423 | |
| 1424 | if (prev == NULL) |
| 1425 | return s; |
| 1426 | |
| 1427 | if ((prev < s) || (prev >= e)) { |
| 1428 | pr_warning("error in %s: map handler doesn't belong to object\n", |
| 1429 | __func__); |
| 1430 | return NULL; |
| 1431 | } |
| 1432 | |
| 1433 | idx = (prev - obj->maps) + 1; |
| 1434 | if (idx >= obj->nr_maps) |
| 1435 | return NULL; |
| 1436 | return &obj->maps[idx]; |
| 1437 | } |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 1438 | |
| 1439 | struct bpf_map * |
Arnaldo Carvalho de Melo | a7fe045 | 2016-06-03 12:22:51 -0300 | [diff] [blame] | 1440 | bpf_object__find_map_by_name(struct bpf_object *obj, const char *name) |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 1441 | { |
| 1442 | struct bpf_map *pos; |
| 1443 | |
| 1444 | bpf_map__for_each(pos, obj) { |
Wang Nan | 973170e | 2015-12-08 02:25:29 +0000 | [diff] [blame] | 1445 | if (pos->name && !strcmp(pos->name, name)) |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 1446 | return pos; |
| 1447 | } |
| 1448 | return NULL; |
| 1449 | } |