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. |
Joe Stringer | f367540 | 2017-01-26 13:19:56 -0800 | [diff] [blame] | 7 | * Copyright (C) 2017 Nicira, Inc. |
Wang Nan | 203d1ca | 2016-07-04 11:02:42 +0000 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public |
| 11 | * License as published by the Free Software Foundation; |
| 12 | * version 2.1 of the License (not later!) |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * 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] | 21 | */ |
| 22 | |
| 23 | #include <stdlib.h> |
Wang Nan | b3f59d6 | 2015-07-01 02:13:52 +0000 | [diff] [blame] | 24 | #include <stdio.h> |
| 25 | #include <stdarg.h> |
Joe Stringer | f367540 | 2017-01-26 13:19:56 -0800 | [diff] [blame] | 26 | #include <libgen.h> |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 27 | #include <inttypes.h> |
Wang Nan | b3f59d6 | 2015-07-01 02:13:52 +0000 | [diff] [blame] | 28 | #include <string.h> |
Wang Nan | 1b76c13 | 2015-07-01 02:13:51 +0000 | [diff] [blame] | 29 | #include <unistd.h> |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 30 | #include <fcntl.h> |
| 31 | #include <errno.h> |
Wang Nan | 1b76c13 | 2015-07-01 02:13:51 +0000 | [diff] [blame] | 32 | #include <asm/unistd.h> |
Joe Stringer | e28ff1a | 2017-01-22 17:11:25 -0800 | [diff] [blame] | 33 | #include <linux/err.h> |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 34 | #include <linux/kernel.h> |
Wang Nan | 1b76c13 | 2015-07-01 02:13:51 +0000 | [diff] [blame] | 35 | #include <linux/bpf.h> |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 36 | #include <linux/list.h> |
Joe Stringer | f367540 | 2017-01-26 13:19:56 -0800 | [diff] [blame] | 37 | #include <linux/limits.h> |
| 38 | #include <sys/stat.h> |
| 39 | #include <sys/types.h> |
| 40 | #include <sys/vfs.h> |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 41 | #include <libelf.h> |
| 42 | #include <gelf.h> |
Wang Nan | 1b76c13 | 2015-07-01 02:13:51 +0000 | [diff] [blame] | 43 | |
| 44 | #include "libbpf.h" |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 45 | #include "bpf.h" |
Wang Nan | b3f59d6 | 2015-07-01 02:13:52 +0000 | [diff] [blame] | 46 | |
Wang Nan | 9b16137 | 2016-07-18 06:01:08 +0000 | [diff] [blame] | 47 | #ifndef EM_BPF |
| 48 | #define EM_BPF 247 |
| 49 | #endif |
| 50 | |
Joe Stringer | f367540 | 2017-01-26 13:19:56 -0800 | [diff] [blame] | 51 | #ifndef BPF_FS_MAGIC |
| 52 | #define BPF_FS_MAGIC 0xcafe4a11 |
| 53 | #endif |
| 54 | |
Wang Nan | b3f59d6 | 2015-07-01 02:13:52 +0000 | [diff] [blame] | 55 | #define __printf(a, b) __attribute__((format(printf, a, b))) |
| 56 | |
| 57 | __printf(1, 2) |
| 58 | static int __base_pr(const char *format, ...) |
| 59 | { |
| 60 | va_list args; |
| 61 | int err; |
| 62 | |
| 63 | va_start(args, format); |
| 64 | err = vfprintf(stderr, format, args); |
| 65 | va_end(args); |
| 66 | return err; |
| 67 | } |
| 68 | |
| 69 | static __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr; |
| 70 | static __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr; |
| 71 | static __printf(1, 2) libbpf_print_fn_t __pr_debug; |
| 72 | |
| 73 | #define __pr(func, fmt, ...) \ |
| 74 | do { \ |
| 75 | if ((func)) \ |
| 76 | (func)("libbpf: " fmt, ##__VA_ARGS__); \ |
| 77 | } while (0) |
| 78 | |
| 79 | #define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__) |
| 80 | #define pr_info(fmt, ...) __pr(__pr_info, fmt, ##__VA_ARGS__) |
| 81 | #define pr_debug(fmt, ...) __pr(__pr_debug, fmt, ##__VA_ARGS__) |
| 82 | |
| 83 | void libbpf_set_print(libbpf_print_fn_t warn, |
| 84 | libbpf_print_fn_t info, |
| 85 | libbpf_print_fn_t debug) |
| 86 | { |
| 87 | __pr_warning = warn; |
| 88 | __pr_info = info; |
| 89 | __pr_debug = debug; |
| 90 | } |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 91 | |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 92 | #define STRERR_BUFSIZE 128 |
| 93 | |
| 94 | #define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START) |
| 95 | #define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c) |
| 96 | #define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START) |
| 97 | |
| 98 | static const char *libbpf_strerror_table[NR_ERRNO] = { |
| 99 | [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf", |
| 100 | [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid", |
| 101 | [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost", |
Colin Ian King | de8a63b | 2016-06-28 13:23:37 +0100 | [diff] [blame] | 102 | [ERRCODE_OFFSET(ENDIAN)] = "Endian mismatch", |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 103 | [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf", |
| 104 | [ERRCODE_OFFSET(RELOC)] = "Relocation failed", |
| 105 | [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading", |
| 106 | [ERRCODE_OFFSET(PROG2BIG)] = "Program too big", |
| 107 | [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version", |
Wang Nan | 705fa21 | 2016-07-13 10:44:02 +0000 | [diff] [blame] | 108 | [ERRCODE_OFFSET(PROGTYPE)] = "Kernel doesn't support this program type", |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 109 | }; |
| 110 | |
| 111 | int libbpf_strerror(int err, char *buf, size_t size) |
| 112 | { |
| 113 | if (!buf || !size) |
| 114 | return -1; |
| 115 | |
| 116 | err = err > 0 ? err : -err; |
| 117 | |
| 118 | if (err < __LIBBPF_ERRNO__START) { |
| 119 | int ret; |
| 120 | |
| 121 | ret = strerror_r(err, buf, size); |
| 122 | buf[size - 1] = '\0'; |
| 123 | return ret; |
| 124 | } |
| 125 | |
| 126 | if (err < __LIBBPF_ERRNO__END) { |
| 127 | const char *msg; |
| 128 | |
| 129 | msg = libbpf_strerror_table[ERRNO_OFFSET(err)]; |
| 130 | snprintf(buf, size, "%s", msg); |
| 131 | buf[size - 1] = '\0'; |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | snprintf(buf, size, "Unknown libbpf error %d", err); |
| 136 | buf[size - 1] = '\0'; |
| 137 | return -1; |
| 138 | } |
| 139 | |
| 140 | #define CHECK_ERR(action, err, out) do { \ |
| 141 | err = action; \ |
| 142 | if (err) \ |
| 143 | goto out; \ |
| 144 | } while(0) |
| 145 | |
| 146 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 147 | /* Copied from tools/perf/util/util.h */ |
| 148 | #ifndef zfree |
| 149 | # define zfree(ptr) ({ free(*ptr); *ptr = NULL; }) |
| 150 | #endif |
| 151 | |
| 152 | #ifndef zclose |
| 153 | # define zclose(fd) ({ \ |
| 154 | int ___err = 0; \ |
| 155 | if ((fd) >= 0) \ |
| 156 | ___err = close((fd)); \ |
| 157 | fd = -1; \ |
| 158 | ___err; }) |
| 159 | #endif |
| 160 | |
| 161 | #ifdef HAVE_LIBELF_MMAP_SUPPORT |
| 162 | # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ_MMAP |
| 163 | #else |
| 164 | # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ |
| 165 | #endif |
| 166 | |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 167 | /* |
| 168 | * bpf_prog should be a better name but it has been used in |
| 169 | * linux/filter.h. |
| 170 | */ |
| 171 | struct bpf_program { |
| 172 | /* Index in elf obj file, for relocation use. */ |
| 173 | int idx; |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 174 | char *name; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 175 | char *section_name; |
| 176 | struct bpf_insn *insns; |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 177 | size_t insns_cnt, main_prog_cnt; |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 178 | enum bpf_prog_type type; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 179 | |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 180 | struct reloc_desc { |
| 181 | enum { |
| 182 | RELO_LD64, |
| 183 | RELO_CALL, |
| 184 | } type; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 185 | int insn_idx; |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 186 | union { |
| 187 | int map_idx; |
| 188 | int text_off; |
| 189 | }; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 190 | } *reloc_desc; |
| 191 | int nr_reloc; |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 192 | |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 193 | struct { |
| 194 | int nr; |
| 195 | int *fds; |
| 196 | } instances; |
| 197 | bpf_program_prep_t preprocessor; |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 198 | |
| 199 | struct bpf_object *obj; |
| 200 | void *priv; |
| 201 | bpf_program_clear_priv_t clear_priv; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 202 | }; |
| 203 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 204 | struct bpf_map { |
| 205 | int fd; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 206 | char *name; |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 207 | size_t offset; |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 208 | struct bpf_map_def def; |
| 209 | void *priv; |
| 210 | bpf_map_clear_priv_t clear_priv; |
| 211 | }; |
| 212 | |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 213 | static LIST_HEAD(bpf_objects_list); |
| 214 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 215 | struct bpf_object { |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 216 | char license[64]; |
| 217 | u32 kern_version; |
Wang Nan | 0b3d1ef | 2015-07-01 02:13:58 +0000 | [diff] [blame] | 218 | |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 219 | struct bpf_program *programs; |
| 220 | size_t nr_programs; |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 221 | struct bpf_map *maps; |
| 222 | size_t nr_maps; |
| 223 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 224 | bool loaded; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 225 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 226 | /* |
| 227 | * Information when doing elf related work. Only valid if fd |
| 228 | * is valid. |
| 229 | */ |
| 230 | struct { |
| 231 | int fd; |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 232 | void *obj_buf; |
| 233 | size_t obj_buf_sz; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 234 | Elf *elf; |
| 235 | GElf_Ehdr ehdr; |
Wang Nan | bec7d68 | 2015-07-01 02:13:59 +0000 | [diff] [blame] | 236 | Elf_Data *symbols; |
Wang Nan | 77ba9a5 | 2015-12-08 02:25:30 +0000 | [diff] [blame] | 237 | size_t strtabidx; |
Wang Nan | b62f06e | 2015-07-01 02:14:01 +0000 | [diff] [blame] | 238 | struct { |
| 239 | GElf_Shdr shdr; |
| 240 | Elf_Data *data; |
| 241 | } *reloc; |
| 242 | int nr_reloc; |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 243 | int maps_shndx; |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 244 | int text_shndx; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 245 | } efile; |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 246 | /* |
| 247 | * All loaded bpf_object is linked in a list, which is |
| 248 | * hidden to caller. bpf_objects__<func> handlers deal with |
| 249 | * all objects. |
| 250 | */ |
| 251 | struct list_head list; |
Wang Nan | 10931d2 | 2016-11-26 07:03:26 +0000 | [diff] [blame] | 252 | |
| 253 | void *priv; |
| 254 | bpf_object_clear_priv_t clear_priv; |
| 255 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 256 | char path[]; |
| 257 | }; |
| 258 | #define obj_elf_valid(o) ((o)->efile.elf) |
| 259 | |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 260 | static void bpf_program__unload(struct bpf_program *prog) |
| 261 | { |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 262 | int i; |
| 263 | |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 264 | if (!prog) |
| 265 | return; |
| 266 | |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 267 | /* |
| 268 | * If the object is opened but the program was never loaded, |
| 269 | * it is possible that prog->instances.nr == -1. |
| 270 | */ |
| 271 | if (prog->instances.nr > 0) { |
| 272 | for (i = 0; i < prog->instances.nr; i++) |
| 273 | zclose(prog->instances.fds[i]); |
| 274 | } else if (prog->instances.nr != -1) { |
| 275 | pr_warning("Internal error: instances.nr is %d\n", |
| 276 | prog->instances.nr); |
| 277 | } |
| 278 | |
| 279 | prog->instances.nr = -1; |
| 280 | zfree(&prog->instances.fds); |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 281 | } |
| 282 | |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 283 | static void bpf_program__exit(struct bpf_program *prog) |
| 284 | { |
| 285 | if (!prog) |
| 286 | return; |
| 287 | |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 288 | if (prog->clear_priv) |
| 289 | prog->clear_priv(prog, prog->priv); |
| 290 | |
| 291 | prog->priv = NULL; |
| 292 | prog->clear_priv = NULL; |
| 293 | |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 294 | bpf_program__unload(prog); |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 295 | zfree(&prog->name); |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 296 | zfree(&prog->section_name); |
| 297 | zfree(&prog->insns); |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 298 | zfree(&prog->reloc_desc); |
| 299 | |
| 300 | prog->nr_reloc = 0; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 301 | prog->insns_cnt = 0; |
| 302 | prog->idx = -1; |
| 303 | } |
| 304 | |
| 305 | static int |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 306 | bpf_program__init(void *data, size_t size, char *section_name, int idx, |
| 307 | struct bpf_program *prog) |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 308 | { |
| 309 | if (size < sizeof(struct bpf_insn)) { |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 310 | pr_warning("corrupted section '%s'\n", section_name); |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 311 | return -EINVAL; |
| 312 | } |
| 313 | |
| 314 | bzero(prog, sizeof(*prog)); |
| 315 | |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 316 | prog->section_name = strdup(section_name); |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 317 | if (!prog->section_name) { |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 318 | pr_warning("failed to alloc name for prog under section %s\n", |
| 319 | section_name); |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 320 | goto errout; |
| 321 | } |
| 322 | |
| 323 | prog->insns = malloc(size); |
| 324 | if (!prog->insns) { |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 325 | pr_warning("failed to alloc insns for prog under section %s\n", |
| 326 | section_name); |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 327 | goto errout; |
| 328 | } |
| 329 | prog->insns_cnt = size / sizeof(struct bpf_insn); |
| 330 | memcpy(prog->insns, data, |
| 331 | prog->insns_cnt * sizeof(struct bpf_insn)); |
| 332 | prog->idx = idx; |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 333 | prog->instances.fds = NULL; |
| 334 | prog->instances.nr = -1; |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 335 | prog->type = BPF_PROG_TYPE_KPROBE; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 336 | |
| 337 | return 0; |
| 338 | errout: |
| 339 | bpf_program__exit(prog); |
| 340 | return -ENOMEM; |
| 341 | } |
| 342 | |
| 343 | static int |
| 344 | bpf_object__add_program(struct bpf_object *obj, void *data, size_t size, |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 345 | char *section_name, int idx) |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 346 | { |
| 347 | struct bpf_program prog, *progs; |
| 348 | int nr_progs, err; |
| 349 | |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 350 | err = bpf_program__init(data, size, section_name, idx, &prog); |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 351 | if (err) |
| 352 | return err; |
| 353 | |
| 354 | progs = obj->programs; |
| 355 | nr_progs = obj->nr_programs; |
| 356 | |
| 357 | progs = realloc(progs, sizeof(progs[0]) * (nr_progs + 1)); |
| 358 | if (!progs) { |
| 359 | /* |
| 360 | * In this case the original obj->programs |
| 361 | * is still valid, so don't need special treat for |
| 362 | * bpf_close_object(). |
| 363 | */ |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 364 | pr_warning("failed to alloc a new program under section '%s'\n", |
| 365 | section_name); |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 366 | bpf_program__exit(&prog); |
| 367 | return -ENOMEM; |
| 368 | } |
| 369 | |
| 370 | pr_debug("found program %s\n", prog.section_name); |
| 371 | obj->programs = progs; |
| 372 | obj->nr_programs = nr_progs + 1; |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 373 | prog.obj = obj; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 374 | progs[nr_progs] = prog; |
| 375 | return 0; |
| 376 | } |
| 377 | |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 378 | static int |
| 379 | bpf_object__init_prog_names(struct bpf_object *obj) |
| 380 | { |
| 381 | Elf_Data *symbols = obj->efile.symbols; |
| 382 | struct bpf_program *prog; |
| 383 | size_t pi, si; |
| 384 | |
| 385 | for (pi = 0; pi < obj->nr_programs; pi++) { |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 386 | const char *name = NULL; |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 387 | |
| 388 | prog = &obj->programs[pi]; |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 389 | if (prog->idx == obj->efile.text_shndx) { |
| 390 | name = ".text"; |
| 391 | goto skip_search; |
| 392 | } |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 393 | |
| 394 | for (si = 0; si < symbols->d_size / sizeof(GElf_Sym) && !name; |
| 395 | si++) { |
| 396 | GElf_Sym sym; |
| 397 | |
| 398 | if (!gelf_getsym(symbols, si, &sym)) |
| 399 | continue; |
| 400 | if (sym.st_shndx != prog->idx) |
| 401 | continue; |
Roman Gushchin | fe4d44b | 2017-12-13 15:18:52 +0000 | [diff] [blame] | 402 | if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL) |
| 403 | continue; |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 404 | |
| 405 | name = elf_strptr(obj->efile.elf, |
| 406 | obj->efile.strtabidx, |
| 407 | sym.st_name); |
| 408 | if (!name) { |
| 409 | pr_warning("failed to get sym name string for prog %s\n", |
| 410 | prog->section_name); |
| 411 | return -LIBBPF_ERRNO__LIBELF; |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | if (!name) { |
| 416 | pr_warning("failed to find sym for prog %s\n", |
| 417 | prog->section_name); |
| 418 | return -EINVAL; |
| 419 | } |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 420 | skip_search: |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 421 | prog->name = strdup(name); |
| 422 | if (!prog->name) { |
| 423 | pr_warning("failed to allocate memory for prog sym %s\n", |
| 424 | name); |
| 425 | return -ENOMEM; |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | return 0; |
| 430 | } |
| 431 | |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 432 | static struct bpf_object *bpf_object__new(const char *path, |
| 433 | void *obj_buf, |
| 434 | size_t obj_buf_sz) |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 435 | { |
| 436 | struct bpf_object *obj; |
| 437 | |
| 438 | obj = calloc(1, sizeof(struct bpf_object) + strlen(path) + 1); |
| 439 | if (!obj) { |
| 440 | pr_warning("alloc memory failed for %s\n", path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 441 | return ERR_PTR(-ENOMEM); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 442 | } |
| 443 | |
| 444 | strcpy(obj->path, path); |
| 445 | obj->efile.fd = -1; |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 446 | |
| 447 | /* |
| 448 | * Caller of this function should also calls |
| 449 | * bpf_object__elf_finish() after data collection to return |
| 450 | * obj_buf to user. If not, we should duplicate the buffer to |
| 451 | * avoid user freeing them before elf finish. |
| 452 | */ |
| 453 | obj->efile.obj_buf = obj_buf; |
| 454 | obj->efile.obj_buf_sz = obj_buf_sz; |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 455 | obj->efile.maps_shndx = -1; |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 456 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 457 | obj->loaded = false; |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 458 | |
| 459 | INIT_LIST_HEAD(&obj->list); |
| 460 | list_add(&obj->list, &bpf_objects_list); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 461 | return obj; |
| 462 | } |
| 463 | |
| 464 | static void bpf_object__elf_finish(struct bpf_object *obj) |
| 465 | { |
| 466 | if (!obj_elf_valid(obj)) |
| 467 | return; |
| 468 | |
| 469 | if (obj->efile.elf) { |
| 470 | elf_end(obj->efile.elf); |
| 471 | obj->efile.elf = NULL; |
| 472 | } |
Wang Nan | bec7d68 | 2015-07-01 02:13:59 +0000 | [diff] [blame] | 473 | obj->efile.symbols = NULL; |
Wang Nan | b62f06e | 2015-07-01 02:14:01 +0000 | [diff] [blame] | 474 | |
| 475 | zfree(&obj->efile.reloc); |
| 476 | obj->efile.nr_reloc = 0; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 477 | zclose(obj->efile.fd); |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 478 | obj->efile.obj_buf = NULL; |
| 479 | obj->efile.obj_buf_sz = 0; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | static int bpf_object__elf_init(struct bpf_object *obj) |
| 483 | { |
| 484 | int err = 0; |
| 485 | GElf_Ehdr *ep; |
| 486 | |
| 487 | if (obj_elf_valid(obj)) { |
| 488 | pr_warning("elf init: internal error\n"); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 489 | return -LIBBPF_ERRNO__LIBELF; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 490 | } |
| 491 | |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 492 | if (obj->efile.obj_buf_sz > 0) { |
| 493 | /* |
| 494 | * obj_buf should have been validated by |
| 495 | * bpf_object__open_buffer(). |
| 496 | */ |
| 497 | obj->efile.elf = elf_memory(obj->efile.obj_buf, |
| 498 | obj->efile.obj_buf_sz); |
| 499 | } else { |
| 500 | obj->efile.fd = open(obj->path, O_RDONLY); |
| 501 | if (obj->efile.fd < 0) { |
| 502 | pr_warning("failed to open %s: %s\n", obj->path, |
| 503 | strerror(errno)); |
| 504 | return -errno; |
| 505 | } |
| 506 | |
| 507 | obj->efile.elf = elf_begin(obj->efile.fd, |
| 508 | LIBBPF_ELF_C_READ_MMAP, |
| 509 | NULL); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 510 | } |
| 511 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 512 | if (!obj->efile.elf) { |
| 513 | pr_warning("failed to open %s as ELF file\n", |
| 514 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 515 | err = -LIBBPF_ERRNO__LIBELF; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 516 | goto errout; |
| 517 | } |
| 518 | |
| 519 | if (!gelf_getehdr(obj->efile.elf, &obj->efile.ehdr)) { |
| 520 | pr_warning("failed to get EHDR from %s\n", |
| 521 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 522 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 523 | goto errout; |
| 524 | } |
| 525 | ep = &obj->efile.ehdr; |
| 526 | |
Wang Nan | 9b16137 | 2016-07-18 06:01:08 +0000 | [diff] [blame] | 527 | /* Old LLVM set e_machine to EM_NONE */ |
| 528 | 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] | 529 | pr_warning("%s is not an eBPF object file\n", |
| 530 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 531 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 532 | goto errout; |
| 533 | } |
| 534 | |
| 535 | return 0; |
| 536 | errout: |
| 537 | bpf_object__elf_finish(obj); |
| 538 | return err; |
| 539 | } |
| 540 | |
Wang Nan | cc4228d | 2015-07-01 02:13:55 +0000 | [diff] [blame] | 541 | static int |
| 542 | bpf_object__check_endianness(struct bpf_object *obj) |
| 543 | { |
| 544 | static unsigned int const endian = 1; |
| 545 | |
| 546 | switch (obj->efile.ehdr.e_ident[EI_DATA]) { |
| 547 | case ELFDATA2LSB: |
| 548 | /* We are big endian, BPF obj is little endian. */ |
| 549 | if (*(unsigned char const *)&endian != 1) |
| 550 | goto mismatch; |
| 551 | break; |
| 552 | |
| 553 | case ELFDATA2MSB: |
| 554 | /* We are little endian, BPF obj is big endian. */ |
| 555 | if (*(unsigned char const *)&endian != 0) |
| 556 | goto mismatch; |
| 557 | break; |
| 558 | default: |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 559 | return -LIBBPF_ERRNO__ENDIAN; |
Wang Nan | cc4228d | 2015-07-01 02:13:55 +0000 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | return 0; |
| 563 | |
| 564 | mismatch: |
| 565 | pr_warning("Error: endianness mismatch.\n"); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 566 | return -LIBBPF_ERRNO__ENDIAN; |
Wang Nan | cc4228d | 2015-07-01 02:13:55 +0000 | [diff] [blame] | 567 | } |
| 568 | |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 569 | static int |
| 570 | bpf_object__init_license(struct bpf_object *obj, |
| 571 | void *data, size_t size) |
| 572 | { |
| 573 | memcpy(obj->license, data, |
| 574 | min(size, sizeof(obj->license) - 1)); |
| 575 | pr_debug("license of %s is %s\n", obj->path, obj->license); |
| 576 | return 0; |
| 577 | } |
| 578 | |
| 579 | static int |
| 580 | bpf_object__init_kversion(struct bpf_object *obj, |
| 581 | void *data, size_t size) |
| 582 | { |
| 583 | u32 kver; |
| 584 | |
| 585 | if (size != sizeof(kver)) { |
| 586 | pr_warning("invalid kver section in %s\n", obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 587 | return -LIBBPF_ERRNO__FORMAT; |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 588 | } |
| 589 | memcpy(&kver, data, sizeof(kver)); |
| 590 | obj->kern_version = kver; |
| 591 | pr_debug("kernel version of %s is %x\n", obj->path, |
| 592 | obj->kern_version); |
| 593 | return 0; |
| 594 | } |
| 595 | |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 596 | static int compare_bpf_map(const void *_a, const void *_b) |
| 597 | { |
| 598 | const struct bpf_map *a = _a; |
| 599 | const struct bpf_map *b = _b; |
| 600 | |
| 601 | return a->offset - b->offset; |
| 602 | } |
| 603 | |
| 604 | static int |
| 605 | bpf_object__init_maps(struct bpf_object *obj) |
| 606 | { |
Craig Gallek | b13c5c1 | 2017-10-05 10:41:57 -0400 | [diff] [blame] | 607 | int i, map_idx, map_def_sz, nr_maps = 0; |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 608 | Elf_Scn *scn; |
| 609 | Elf_Data *data; |
| 610 | Elf_Data *symbols = obj->efile.symbols; |
| 611 | |
| 612 | if (obj->efile.maps_shndx < 0) |
| 613 | return -EINVAL; |
| 614 | if (!symbols) |
| 615 | return -EINVAL; |
| 616 | |
| 617 | scn = elf_getscn(obj->efile.elf, obj->efile.maps_shndx); |
| 618 | if (scn) |
| 619 | data = elf_getdata(scn, NULL); |
| 620 | if (!scn || !data) { |
| 621 | pr_warning("failed to get Elf_Data from map section %d\n", |
| 622 | obj->efile.maps_shndx); |
| 623 | return -EINVAL; |
Wang Nan | 0b3d1ef | 2015-07-01 02:13:58 +0000 | [diff] [blame] | 624 | } |
| 625 | |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 626 | /* |
| 627 | * Count number of maps. Each map has a name. |
| 628 | * Array of maps is not supported: only the first element is |
| 629 | * considered. |
| 630 | * |
| 631 | * TODO: Detect array of map and report error. |
| 632 | */ |
| 633 | for (i = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) { |
| 634 | GElf_Sym sym; |
| 635 | |
| 636 | if (!gelf_getsym(symbols, i, &sym)) |
| 637 | continue; |
| 638 | if (sym.st_shndx != obj->efile.maps_shndx) |
| 639 | continue; |
| 640 | nr_maps++; |
| 641 | } |
| 642 | |
| 643 | /* Alloc obj->maps and fill nr_maps. */ |
| 644 | pr_debug("maps in %s: %d maps in %zd bytes\n", obj->path, |
| 645 | nr_maps, data->d_size); |
| 646 | |
| 647 | if (!nr_maps) |
| 648 | return 0; |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 649 | |
Craig Gallek | b13c5c1 | 2017-10-05 10:41:57 -0400 | [diff] [blame] | 650 | /* Assume equally sized map definitions */ |
| 651 | map_def_sz = data->d_size / nr_maps; |
| 652 | if (!data->d_size || (data->d_size % nr_maps) != 0) { |
| 653 | pr_warning("unable to determine map definition size " |
| 654 | "section %s, %d maps in %zd bytes\n", |
| 655 | obj->path, nr_maps, data->d_size); |
| 656 | return -EINVAL; |
| 657 | } |
| 658 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 659 | obj->maps = calloc(nr_maps, sizeof(obj->maps[0])); |
| 660 | if (!obj->maps) { |
| 661 | pr_warning("alloc maps for object failed\n"); |
Wang Nan | 0b3d1ef | 2015-07-01 02:13:58 +0000 | [diff] [blame] | 662 | return -ENOMEM; |
| 663 | } |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 664 | obj->nr_maps = nr_maps; |
Wang Nan | 0b3d1ef | 2015-07-01 02:13:58 +0000 | [diff] [blame] | 665 | |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 666 | /* |
| 667 | * fill all fd with -1 so won't close incorrect |
| 668 | * fd (fd=0 is stdin) when failure (zclose won't close |
| 669 | * negative fd)). |
| 670 | */ |
| 671 | for (i = 0; i < nr_maps; i++) |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 672 | obj->maps[i].fd = -1; |
| 673 | |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 674 | /* |
| 675 | * Fill obj->maps using data in "maps" section. |
| 676 | */ |
| 677 | for (i = 0, map_idx = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) { |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 678 | GElf_Sym sym; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 679 | const char *map_name; |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 680 | struct bpf_map_def *def; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 681 | |
| 682 | if (!gelf_getsym(symbols, i, &sym)) |
| 683 | continue; |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 684 | if (sym.st_shndx != obj->efile.maps_shndx) |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 685 | continue; |
| 686 | |
| 687 | map_name = elf_strptr(obj->efile.elf, |
Wang Nan | 77ba9a5 | 2015-12-08 02:25:30 +0000 | [diff] [blame] | 688 | obj->efile.strtabidx, |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 689 | sym.st_name); |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 690 | obj->maps[map_idx].offset = sym.st_value; |
Craig Gallek | b13c5c1 | 2017-10-05 10:41:57 -0400 | [diff] [blame] | 691 | if (sym.st_value + map_def_sz > data->d_size) { |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 692 | pr_warning("corrupted maps section in %s: last map \"%s\" too small\n", |
| 693 | obj->path, map_name); |
| 694 | return -EINVAL; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 695 | } |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 696 | |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 697 | obj->maps[map_idx].name = strdup(map_name); |
Wang Nan | 973170e | 2015-12-08 02:25:29 +0000 | [diff] [blame] | 698 | if (!obj->maps[map_idx].name) { |
| 699 | pr_warning("failed to alloc map name\n"); |
| 700 | return -ENOMEM; |
| 701 | } |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 702 | pr_debug("map %d is \"%s\"\n", map_idx, |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 703 | obj->maps[map_idx].name); |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 704 | def = (struct bpf_map_def *)(data->d_buf + sym.st_value); |
Craig Gallek | b13c5c1 | 2017-10-05 10:41:57 -0400 | [diff] [blame] | 705 | /* |
| 706 | * If the definition of the map in the object file fits in |
| 707 | * bpf_map_def, copy it. Any extra fields in our version |
| 708 | * of bpf_map_def will default to zero as a result of the |
| 709 | * calloc above. |
| 710 | */ |
| 711 | if (map_def_sz <= sizeof(struct bpf_map_def)) { |
| 712 | memcpy(&obj->maps[map_idx].def, def, map_def_sz); |
| 713 | } else { |
| 714 | /* |
| 715 | * Here the map structure being read is bigger than what |
| 716 | * we expect, truncate if the excess bits are all zero. |
| 717 | * If they are not zero, reject this map as |
| 718 | * incompatible. |
| 719 | */ |
| 720 | char *b; |
| 721 | for (b = ((char *)def) + sizeof(struct bpf_map_def); |
| 722 | b < ((char *)def) + map_def_sz; b++) { |
| 723 | if (*b != 0) { |
| 724 | pr_warning("maps section in %s: \"%s\" " |
| 725 | "has unrecognized, non-zero " |
| 726 | "options\n", |
| 727 | obj->path, map_name); |
| 728 | return -EINVAL; |
| 729 | } |
| 730 | } |
| 731 | memcpy(&obj->maps[map_idx].def, def, |
| 732 | sizeof(struct bpf_map_def)); |
| 733 | } |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 734 | map_idx++; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 735 | } |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 736 | |
| 737 | qsort(obj->maps, obj->nr_maps, sizeof(obj->maps[0]), compare_bpf_map); |
Craig Gallek | b13c5c1 | 2017-10-05 10:41:57 -0400 | [diff] [blame] | 738 | return 0; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 739 | } |
| 740 | |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 741 | static int bpf_object__elf_collect(struct bpf_object *obj) |
| 742 | { |
| 743 | Elf *elf = obj->efile.elf; |
| 744 | GElf_Ehdr *ep = &obj->efile.ehdr; |
| 745 | Elf_Scn *scn = NULL; |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 746 | int idx = 0, err = 0; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 747 | |
| 748 | /* Elf is corrupted/truncated, avoid calling elf_strptr. */ |
| 749 | if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) { |
| 750 | pr_warning("failed to get e_shstrndx from %s\n", |
| 751 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 752 | return -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 753 | } |
| 754 | |
| 755 | while ((scn = elf_nextscn(elf, scn)) != NULL) { |
| 756 | char *name; |
| 757 | GElf_Shdr sh; |
| 758 | Elf_Data *data; |
| 759 | |
| 760 | idx++; |
| 761 | if (gelf_getshdr(scn, &sh) != &sh) { |
| 762 | pr_warning("failed to get section header from %s\n", |
| 763 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 764 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 765 | goto out; |
| 766 | } |
| 767 | |
| 768 | name = elf_strptr(elf, ep->e_shstrndx, sh.sh_name); |
| 769 | if (!name) { |
| 770 | pr_warning("failed to get section name from %s\n", |
| 771 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 772 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 773 | goto out; |
| 774 | } |
| 775 | |
| 776 | data = elf_getdata(scn, 0); |
| 777 | if (!data) { |
| 778 | pr_warning("failed to get section data from %s(%s)\n", |
| 779 | name, obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 780 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 781 | goto out; |
| 782 | } |
| 783 | pr_debug("section %s, size %ld, link %d, flags %lx, type=%d\n", |
| 784 | name, (unsigned long)data->d_size, |
| 785 | (int)sh.sh_link, (unsigned long)sh.sh_flags, |
| 786 | (int)sh.sh_type); |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 787 | |
| 788 | if (strcmp(name, "license") == 0) |
| 789 | err = bpf_object__init_license(obj, |
| 790 | data->d_buf, |
| 791 | data->d_size); |
| 792 | else if (strcmp(name, "version") == 0) |
| 793 | err = bpf_object__init_kversion(obj, |
| 794 | data->d_buf, |
| 795 | data->d_size); |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 796 | else if (strcmp(name, "maps") == 0) |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 797 | obj->efile.maps_shndx = idx; |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 798 | else if (sh.sh_type == SHT_SYMTAB) { |
Wang Nan | bec7d68 | 2015-07-01 02:13:59 +0000 | [diff] [blame] | 799 | if (obj->efile.symbols) { |
| 800 | pr_warning("bpf: multiple SYMTAB in %s\n", |
| 801 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 802 | err = -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 77ba9a5 | 2015-12-08 02:25:30 +0000 | [diff] [blame] | 803 | } else { |
Wang Nan | bec7d68 | 2015-07-01 02:13:59 +0000 | [diff] [blame] | 804 | obj->efile.symbols = data; |
Wang Nan | 77ba9a5 | 2015-12-08 02:25:30 +0000 | [diff] [blame] | 805 | obj->efile.strtabidx = sh.sh_link; |
| 806 | } |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 807 | } else if ((sh.sh_type == SHT_PROGBITS) && |
| 808 | (sh.sh_flags & SHF_EXECINSTR) && |
| 809 | (data->d_size > 0)) { |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 810 | if (strcmp(name, ".text") == 0) |
| 811 | obj->efile.text_shndx = idx; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 812 | err = bpf_object__add_program(obj, data->d_buf, |
| 813 | data->d_size, name, idx); |
| 814 | if (err) { |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 815 | char errmsg[STRERR_BUFSIZE]; |
| 816 | |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 817 | strerror_r(-err, errmsg, sizeof(errmsg)); |
| 818 | pr_warning("failed to alloc program %s (%s): %s", |
| 819 | name, obj->path, errmsg); |
| 820 | } |
Wang Nan | b62f06e | 2015-07-01 02:14:01 +0000 | [diff] [blame] | 821 | } else if (sh.sh_type == SHT_REL) { |
| 822 | void *reloc = obj->efile.reloc; |
| 823 | int nr_reloc = obj->efile.nr_reloc + 1; |
| 824 | |
| 825 | reloc = realloc(reloc, |
| 826 | sizeof(*obj->efile.reloc) * nr_reloc); |
| 827 | if (!reloc) { |
| 828 | pr_warning("realloc failed\n"); |
| 829 | err = -ENOMEM; |
| 830 | } else { |
| 831 | int n = nr_reloc - 1; |
| 832 | |
| 833 | obj->efile.reloc = reloc; |
| 834 | obj->efile.nr_reloc = nr_reloc; |
| 835 | |
| 836 | obj->efile.reloc[n].shdr = sh; |
| 837 | obj->efile.reloc[n].data = data; |
| 838 | } |
Wang Nan | bec7d68 | 2015-07-01 02:13:59 +0000 | [diff] [blame] | 839 | } |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 840 | if (err) |
| 841 | goto out; |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 842 | } |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 843 | |
Wang Nan | 77ba9a5 | 2015-12-08 02:25:30 +0000 | [diff] [blame] | 844 | if (!obj->efile.strtabidx || obj->efile.strtabidx >= idx) { |
| 845 | pr_warning("Corrupted ELF file: index of strtab invalid\n"); |
| 846 | return LIBBPF_ERRNO__FORMAT; |
| 847 | } |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 848 | if (obj->efile.maps_shndx >= 0) { |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 849 | err = bpf_object__init_maps(obj); |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 850 | if (err) |
| 851 | goto out; |
| 852 | } |
| 853 | err = bpf_object__init_prog_names(obj); |
Wang Nan | 2960366 | 2015-07-01 02:13:56 +0000 | [diff] [blame] | 854 | out: |
| 855 | return err; |
| 856 | } |
| 857 | |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 858 | static struct bpf_program * |
| 859 | bpf_object__find_prog_by_idx(struct bpf_object *obj, int idx) |
| 860 | { |
| 861 | struct bpf_program *prog; |
| 862 | size_t i; |
| 863 | |
| 864 | for (i = 0; i < obj->nr_programs; i++) { |
| 865 | prog = &obj->programs[i]; |
| 866 | if (prog->idx == idx) |
| 867 | return prog; |
| 868 | } |
| 869 | return NULL; |
| 870 | } |
| 871 | |
| 872 | static int |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 873 | bpf_program__collect_reloc(struct bpf_program *prog, GElf_Shdr *shdr, |
| 874 | Elf_Data *data, struct bpf_object *obj) |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 875 | { |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 876 | Elf_Data *symbols = obj->efile.symbols; |
| 877 | int text_shndx = obj->efile.text_shndx; |
| 878 | int maps_shndx = obj->efile.maps_shndx; |
| 879 | struct bpf_map *maps = obj->maps; |
| 880 | size_t nr_maps = obj->nr_maps; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 881 | int i, nrels; |
| 882 | |
| 883 | pr_debug("collecting relocating info for: '%s'\n", |
| 884 | prog->section_name); |
| 885 | nrels = shdr->sh_size / shdr->sh_entsize; |
| 886 | |
| 887 | prog->reloc_desc = malloc(sizeof(*prog->reloc_desc) * nrels); |
| 888 | if (!prog->reloc_desc) { |
| 889 | pr_warning("failed to alloc memory in relocation\n"); |
| 890 | return -ENOMEM; |
| 891 | } |
| 892 | prog->nr_reloc = nrels; |
| 893 | |
| 894 | for (i = 0; i < nrels; i++) { |
| 895 | GElf_Sym sym; |
| 896 | GElf_Rel rel; |
| 897 | unsigned int insn_idx; |
| 898 | struct bpf_insn *insns = prog->insns; |
| 899 | size_t map_idx; |
| 900 | |
| 901 | if (!gelf_getrel(data, i, &rel)) { |
| 902 | pr_warning("relocation: failed to get %d reloc\n", i); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 903 | return -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 904 | } |
| 905 | |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 906 | if (!gelf_getsym(symbols, |
| 907 | GELF_R_SYM(rel.r_info), |
| 908 | &sym)) { |
| 909 | pr_warning("relocation: symbol %"PRIx64" not found\n", |
| 910 | GELF_R_SYM(rel.r_info)); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 911 | return -LIBBPF_ERRNO__FORMAT; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 912 | } |
David Miller | 7d9890e | 2017-12-19 15:53:11 -0500 | [diff] [blame] | 913 | pr_debug("relo for %lld value %lld name %d\n", |
| 914 | (long long) (rel.r_info >> 32), |
| 915 | (long long) sym.st_value, sym.st_name); |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 916 | |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 917 | if (sym.st_shndx != maps_shndx && sym.st_shndx != text_shndx) { |
Wang Nan | 666810e | 2016-01-25 09:55:49 +0000 | [diff] [blame] | 918 | pr_warning("Program '%s' contains non-map related relo data pointing to section %u\n", |
| 919 | prog->section_name, sym.st_shndx); |
| 920 | return -LIBBPF_ERRNO__RELOC; |
| 921 | } |
| 922 | |
| 923 | insn_idx = rel.r_offset / sizeof(struct bpf_insn); |
| 924 | pr_debug("relocation: insn_idx=%u\n", insn_idx); |
| 925 | |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 926 | if (insns[insn_idx].code == (BPF_JMP | BPF_CALL)) { |
| 927 | if (insns[insn_idx].src_reg != BPF_PSEUDO_CALL) { |
| 928 | pr_warning("incorrect bpf_call opcode\n"); |
| 929 | return -LIBBPF_ERRNO__RELOC; |
| 930 | } |
| 931 | prog->reloc_desc[i].type = RELO_CALL; |
| 932 | prog->reloc_desc[i].insn_idx = insn_idx; |
| 933 | prog->reloc_desc[i].text_off = sym.st_value; |
| 934 | continue; |
| 935 | } |
| 936 | |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 937 | if (insns[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) { |
| 938 | pr_warning("bpf: relocation: invalid relo for insns[%d].code 0x%x\n", |
| 939 | insn_idx, insns[insn_idx].code); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 940 | return -LIBBPF_ERRNO__RELOC; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 941 | } |
| 942 | |
Joe Stringer | 94e5ade | 2017-01-22 17:11:22 -0800 | [diff] [blame] | 943 | /* TODO: 'maps' is sorted. We can use bsearch to make it faster. */ |
| 944 | for (map_idx = 0; map_idx < nr_maps; map_idx++) { |
| 945 | if (maps[map_idx].offset == sym.st_value) { |
| 946 | pr_debug("relocation: find map %zd (%s) for insn %u\n", |
| 947 | map_idx, maps[map_idx].name, insn_idx); |
| 948 | break; |
| 949 | } |
| 950 | } |
| 951 | |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 952 | if (map_idx >= nr_maps) { |
| 953 | pr_warning("bpf relocation: map_idx %d large than %d\n", |
| 954 | (int)map_idx, (int)nr_maps - 1); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 955 | return -LIBBPF_ERRNO__RELOC; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 956 | } |
| 957 | |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 958 | prog->reloc_desc[i].type = RELO_LD64; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 959 | prog->reloc_desc[i].insn_idx = insn_idx; |
| 960 | prog->reloc_desc[i].map_idx = map_idx; |
| 961 | } |
| 962 | return 0; |
| 963 | } |
| 964 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 965 | static int |
| 966 | bpf_object__create_maps(struct bpf_object *obj) |
| 967 | { |
| 968 | unsigned int i; |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 969 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 970 | for (i = 0; i < obj->nr_maps; i++) { |
| 971 | struct bpf_map_def *def = &obj->maps[i].def; |
| 972 | int *pfd = &obj->maps[i].fd; |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 973 | |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 974 | *pfd = bpf_create_map_name(def->type, |
| 975 | obj->maps[i].name, |
| 976 | def->key_size, |
| 977 | def->value_size, |
| 978 | def->max_entries, |
Craig Gallek | fe9b5f7 | 2017-10-05 10:41:58 -0400 | [diff] [blame] | 979 | def->map_flags); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 980 | if (*pfd < 0) { |
| 981 | size_t j; |
| 982 | int err = *pfd; |
| 983 | |
Eric Leblond | 49bf4b3 | 2017-08-20 21:48:14 +0200 | [diff] [blame] | 984 | pr_warning("failed to create map (name: '%s'): %s\n", |
| 985 | obj->maps[i].name, |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 986 | strerror(errno)); |
| 987 | for (j = 0; j < i; j++) |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 988 | zclose(obj->maps[j].fd); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 989 | return err; |
| 990 | } |
Eric Leblond | 4708bbd | 2016-11-15 04:05:47 +0000 | [diff] [blame] | 991 | pr_debug("create map %s: fd=%d\n", obj->maps[i].name, *pfd); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 992 | } |
| 993 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 994 | return 0; |
| 995 | } |
| 996 | |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 997 | static int |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 998 | bpf_program__reloc_text(struct bpf_program *prog, struct bpf_object *obj, |
| 999 | struct reloc_desc *relo) |
| 1000 | { |
| 1001 | struct bpf_insn *insn, *new_insn; |
| 1002 | struct bpf_program *text; |
| 1003 | size_t new_cnt; |
| 1004 | |
| 1005 | if (relo->type != RELO_CALL) |
| 1006 | return -LIBBPF_ERRNO__RELOC; |
| 1007 | |
| 1008 | if (prog->idx == obj->efile.text_shndx) { |
| 1009 | pr_warning("relo in .text insn %d into off %d\n", |
| 1010 | relo->insn_idx, relo->text_off); |
| 1011 | return -LIBBPF_ERRNO__RELOC; |
| 1012 | } |
| 1013 | |
| 1014 | if (prog->main_prog_cnt == 0) { |
| 1015 | text = bpf_object__find_prog_by_idx(obj, obj->efile.text_shndx); |
| 1016 | if (!text) { |
| 1017 | pr_warning("no .text section found yet relo into text exist\n"); |
| 1018 | return -LIBBPF_ERRNO__RELOC; |
| 1019 | } |
| 1020 | new_cnt = prog->insns_cnt + text->insns_cnt; |
| 1021 | new_insn = realloc(prog->insns, new_cnt * sizeof(*insn)); |
| 1022 | if (!new_insn) { |
| 1023 | pr_warning("oom in prog realloc\n"); |
| 1024 | return -ENOMEM; |
| 1025 | } |
| 1026 | memcpy(new_insn + prog->insns_cnt, text->insns, |
| 1027 | text->insns_cnt * sizeof(*insn)); |
| 1028 | prog->insns = new_insn; |
| 1029 | prog->main_prog_cnt = prog->insns_cnt; |
| 1030 | prog->insns_cnt = new_cnt; |
| 1031 | } |
| 1032 | insn = &prog->insns[relo->insn_idx]; |
| 1033 | insn->imm += prog->main_prog_cnt - relo->insn_idx; |
| 1034 | pr_debug("added %zd insn from %s to prog %s\n", |
| 1035 | text->insns_cnt, text->section_name, prog->section_name); |
| 1036 | return 0; |
| 1037 | } |
| 1038 | |
| 1039 | static int |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1040 | bpf_program__relocate(struct bpf_program *prog, struct bpf_object *obj) |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 1041 | { |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 1042 | int i, err; |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 1043 | |
| 1044 | if (!prog || !prog->reloc_desc) |
| 1045 | return 0; |
| 1046 | |
| 1047 | for (i = 0; i < prog->nr_reloc; i++) { |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 1048 | if (prog->reloc_desc[i].type == RELO_LD64) { |
| 1049 | struct bpf_insn *insns = prog->insns; |
| 1050 | int insn_idx, map_idx; |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 1051 | |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 1052 | insn_idx = prog->reloc_desc[i].insn_idx; |
| 1053 | map_idx = prog->reloc_desc[i].map_idx; |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 1054 | |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 1055 | if (insn_idx >= (int)prog->insns_cnt) { |
| 1056 | pr_warning("relocation out of range: '%s'\n", |
| 1057 | prog->section_name); |
| 1058 | return -LIBBPF_ERRNO__RELOC; |
| 1059 | } |
| 1060 | insns[insn_idx].src_reg = BPF_PSEUDO_MAP_FD; |
| 1061 | insns[insn_idx].imm = obj->maps[map_idx].fd; |
| 1062 | } else { |
| 1063 | err = bpf_program__reloc_text(prog, obj, |
| 1064 | &prog->reloc_desc[i]); |
| 1065 | if (err) |
| 1066 | return err; |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 1067 | } |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 1068 | } |
| 1069 | |
| 1070 | zfree(&prog->reloc_desc); |
| 1071 | prog->nr_reloc = 0; |
| 1072 | return 0; |
| 1073 | } |
| 1074 | |
| 1075 | |
| 1076 | static int |
| 1077 | bpf_object__relocate(struct bpf_object *obj) |
| 1078 | { |
| 1079 | struct bpf_program *prog; |
| 1080 | size_t i; |
| 1081 | int err; |
| 1082 | |
| 1083 | for (i = 0; i < obj->nr_programs; i++) { |
| 1084 | prog = &obj->programs[i]; |
| 1085 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1086 | err = bpf_program__relocate(prog, obj); |
Wang Nan | 8a47a6c | 2015-07-01 02:14:05 +0000 | [diff] [blame] | 1087 | if (err) { |
| 1088 | pr_warning("failed to relocate '%s'\n", |
| 1089 | prog->section_name); |
| 1090 | return err; |
| 1091 | } |
| 1092 | } |
| 1093 | return 0; |
| 1094 | } |
| 1095 | |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 1096 | static int bpf_object__collect_reloc(struct bpf_object *obj) |
| 1097 | { |
| 1098 | int i, err; |
| 1099 | |
| 1100 | if (!obj_elf_valid(obj)) { |
| 1101 | pr_warning("Internal error: elf object is closed\n"); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1102 | return -LIBBPF_ERRNO__INTERNAL; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 1103 | } |
| 1104 | |
| 1105 | for (i = 0; i < obj->efile.nr_reloc; i++) { |
| 1106 | GElf_Shdr *shdr = &obj->efile.reloc[i].shdr; |
| 1107 | Elf_Data *data = obj->efile.reloc[i].data; |
| 1108 | int idx = shdr->sh_info; |
| 1109 | struct bpf_program *prog; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 1110 | |
| 1111 | if (shdr->sh_type != SHT_REL) { |
| 1112 | pr_warning("internal error at %d\n", __LINE__); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1113 | return -LIBBPF_ERRNO__INTERNAL; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 1114 | } |
| 1115 | |
| 1116 | prog = bpf_object__find_prog_by_idx(obj, idx); |
| 1117 | if (!prog) { |
| 1118 | pr_warning("relocation failed: no %d section\n", |
| 1119 | idx); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1120 | return -LIBBPF_ERRNO__RELOC; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 1121 | } |
| 1122 | |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 1123 | err = bpf_program__collect_reloc(prog, |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 1124 | shdr, data, |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 1125 | obj); |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 1126 | if (err) |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1127 | return err; |
Wang Nan | 3409091 | 2015-07-01 02:14:02 +0000 | [diff] [blame] | 1128 | } |
| 1129 | return 0; |
| 1130 | } |
| 1131 | |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1132 | static int |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 1133 | load_program(enum bpf_prog_type type, const char *name, struct bpf_insn *insns, |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 1134 | int insns_cnt, char *license, u32 kern_version, int *pfd) |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1135 | { |
| 1136 | int ret; |
| 1137 | char *log_buf; |
| 1138 | |
| 1139 | if (!insns || !insns_cnt) |
| 1140 | return -EINVAL; |
| 1141 | |
| 1142 | log_buf = malloc(BPF_LOG_BUF_SIZE); |
| 1143 | if (!log_buf) |
| 1144 | pr_warning("Alloc log buffer for bpf loader error, continue without log\n"); |
| 1145 | |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 1146 | ret = bpf_load_program_name(type, name, insns, insns_cnt, license, |
| 1147 | kern_version, log_buf, BPF_LOG_BUF_SIZE); |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1148 | |
| 1149 | if (ret >= 0) { |
| 1150 | *pfd = ret; |
| 1151 | ret = 0; |
| 1152 | goto out; |
| 1153 | } |
| 1154 | |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1155 | ret = -LIBBPF_ERRNO__LOAD; |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1156 | pr_warning("load bpf program failed: %s\n", strerror(errno)); |
| 1157 | |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1158 | if (log_buf && log_buf[0] != '\0') { |
| 1159 | ret = -LIBBPF_ERRNO__VERIFY; |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1160 | pr_warning("-- BEGIN DUMP LOG ---\n"); |
| 1161 | pr_warning("\n%s\n", log_buf); |
| 1162 | pr_warning("-- END LOG --\n"); |
Wang Nan | 705fa21 | 2016-07-13 10:44:02 +0000 | [diff] [blame] | 1163 | } else if (insns_cnt >= BPF_MAXINSNS) { |
| 1164 | pr_warning("Program too large (%d insns), at most %d insns\n", |
| 1165 | insns_cnt, BPF_MAXINSNS); |
| 1166 | ret = -LIBBPF_ERRNO__PROG2BIG; |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1167 | } else { |
Wang Nan | 705fa21 | 2016-07-13 10:44:02 +0000 | [diff] [blame] | 1168 | /* Wrong program type? */ |
| 1169 | if (type != BPF_PROG_TYPE_KPROBE) { |
| 1170 | int fd; |
| 1171 | |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 1172 | fd = bpf_load_program_name(BPF_PROG_TYPE_KPROBE, name, |
| 1173 | insns, insns_cnt, license, |
| 1174 | kern_version, NULL, 0); |
Wang Nan | 705fa21 | 2016-07-13 10:44:02 +0000 | [diff] [blame] | 1175 | if (fd >= 0) { |
| 1176 | close(fd); |
| 1177 | ret = -LIBBPF_ERRNO__PROGTYPE; |
| 1178 | goto out; |
| 1179 | } |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1180 | } |
Wang Nan | 705fa21 | 2016-07-13 10:44:02 +0000 | [diff] [blame] | 1181 | |
| 1182 | if (log_buf) |
| 1183 | ret = -LIBBPF_ERRNO__KVER; |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1184 | } |
| 1185 | |
| 1186 | out: |
| 1187 | free(log_buf); |
| 1188 | return ret; |
| 1189 | } |
| 1190 | |
| 1191 | static int |
| 1192 | bpf_program__load(struct bpf_program *prog, |
| 1193 | char *license, u32 kern_version) |
| 1194 | { |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 1195 | int err = 0, fd, i; |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1196 | |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 1197 | if (prog->instances.nr < 0 || !prog->instances.fds) { |
| 1198 | if (prog->preprocessor) { |
| 1199 | pr_warning("Internal error: can't load program '%s'\n", |
| 1200 | prog->section_name); |
| 1201 | return -LIBBPF_ERRNO__INTERNAL; |
| 1202 | } |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1203 | |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 1204 | prog->instances.fds = malloc(sizeof(int)); |
| 1205 | if (!prog->instances.fds) { |
| 1206 | pr_warning("Not enough memory for BPF fds\n"); |
| 1207 | return -ENOMEM; |
| 1208 | } |
| 1209 | prog->instances.nr = 1; |
| 1210 | prog->instances.fds[0] = -1; |
| 1211 | } |
| 1212 | |
| 1213 | if (!prog->preprocessor) { |
| 1214 | if (prog->instances.nr != 1) { |
| 1215 | pr_warning("Program '%s' is inconsistent: nr(%d) != 1\n", |
| 1216 | prog->section_name, prog->instances.nr); |
| 1217 | } |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 1218 | err = load_program(prog->type, prog->name, prog->insns, |
| 1219 | prog->insns_cnt, license, kern_version, &fd); |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 1220 | if (!err) |
| 1221 | prog->instances.fds[0] = fd; |
| 1222 | goto out; |
| 1223 | } |
| 1224 | |
| 1225 | for (i = 0; i < prog->instances.nr; i++) { |
| 1226 | struct bpf_prog_prep_result result; |
| 1227 | bpf_program_prep_t preprocessor = prog->preprocessor; |
| 1228 | |
| 1229 | bzero(&result, sizeof(result)); |
| 1230 | err = preprocessor(prog, i, prog->insns, |
| 1231 | prog->insns_cnt, &result); |
| 1232 | if (err) { |
| 1233 | pr_warning("Preprocessing the %dth instance of program '%s' failed\n", |
| 1234 | i, prog->section_name); |
| 1235 | goto out; |
| 1236 | } |
| 1237 | |
| 1238 | if (!result.new_insn_ptr || !result.new_insn_cnt) { |
| 1239 | pr_debug("Skip loading the %dth instance of program '%s'\n", |
| 1240 | i, prog->section_name); |
| 1241 | prog->instances.fds[i] = -1; |
| 1242 | if (result.pfd) |
| 1243 | *result.pfd = -1; |
| 1244 | continue; |
| 1245 | } |
| 1246 | |
Martin KaFai Lau | 88cda1c | 2017-09-27 14:37:54 -0700 | [diff] [blame] | 1247 | err = load_program(prog->type, prog->name, |
| 1248 | result.new_insn_ptr, |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 1249 | result.new_insn_cnt, |
| 1250 | license, kern_version, &fd); |
| 1251 | |
| 1252 | if (err) { |
| 1253 | pr_warning("Loading the %dth instance of program '%s' failed\n", |
| 1254 | i, prog->section_name); |
| 1255 | goto out; |
| 1256 | } |
| 1257 | |
| 1258 | if (result.pfd) |
| 1259 | *result.pfd = fd; |
| 1260 | prog->instances.fds[i] = fd; |
| 1261 | } |
| 1262 | out: |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1263 | if (err) |
| 1264 | pr_warning("failed to load program '%s'\n", |
| 1265 | prog->section_name); |
| 1266 | zfree(&prog->insns); |
| 1267 | prog->insns_cnt = 0; |
| 1268 | return err; |
| 1269 | } |
| 1270 | |
| 1271 | static int |
| 1272 | bpf_object__load_progs(struct bpf_object *obj) |
| 1273 | { |
| 1274 | size_t i; |
| 1275 | int err; |
| 1276 | |
| 1277 | for (i = 0; i < obj->nr_programs; i++) { |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 1278 | if (obj->programs[i].idx == obj->efile.text_shndx) |
| 1279 | continue; |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1280 | err = bpf_program__load(&obj->programs[i], |
| 1281 | obj->license, |
| 1282 | obj->kern_version); |
| 1283 | if (err) |
| 1284 | return err; |
| 1285 | } |
| 1286 | return 0; |
| 1287 | } |
| 1288 | |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 1289 | static int bpf_object__validate(struct bpf_object *obj) |
| 1290 | { |
| 1291 | if (obj->kern_version == 0) { |
| 1292 | pr_warning("%s doesn't provide kernel version\n", |
| 1293 | obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1294 | return -LIBBPF_ERRNO__KVERSION; |
Wang Nan | cb1e5e9 | 2015-07-01 02:13:57 +0000 | [diff] [blame] | 1295 | } |
| 1296 | return 0; |
| 1297 | } |
| 1298 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1299 | static struct bpf_object * |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1300 | __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] | 1301 | { |
| 1302 | struct bpf_object *obj; |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1303 | int err; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1304 | |
| 1305 | if (elf_version(EV_CURRENT) == EV_NONE) { |
| 1306 | pr_warning("failed to init libelf for %s\n", path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1307 | return ERR_PTR(-LIBBPF_ERRNO__LIBELF); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1308 | } |
| 1309 | |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1310 | obj = bpf_object__new(path, obj_buf, obj_buf_sz); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1311 | if (IS_ERR(obj)) |
| 1312 | return obj; |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1313 | |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1314 | CHECK_ERR(bpf_object__elf_init(obj), err, out); |
| 1315 | CHECK_ERR(bpf_object__check_endianness(obj), err, out); |
| 1316 | CHECK_ERR(bpf_object__elf_collect(obj), err, out); |
| 1317 | CHECK_ERR(bpf_object__collect_reloc(obj), err, out); |
| 1318 | CHECK_ERR(bpf_object__validate(obj), err, out); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1319 | |
| 1320 | bpf_object__elf_finish(obj); |
| 1321 | return obj; |
| 1322 | out: |
| 1323 | bpf_object__close(obj); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1324 | return ERR_PTR(err); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1325 | } |
| 1326 | |
| 1327 | struct bpf_object *bpf_object__open(const char *path) |
| 1328 | { |
| 1329 | /* param validation */ |
| 1330 | if (!path) |
| 1331 | return NULL; |
| 1332 | |
| 1333 | pr_debug("loading %s\n", path); |
| 1334 | |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1335 | return __bpf_object__open(path, NULL, 0); |
| 1336 | } |
| 1337 | |
| 1338 | struct bpf_object *bpf_object__open_buffer(void *obj_buf, |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1339 | size_t obj_buf_sz, |
| 1340 | const char *name) |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1341 | { |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1342 | char tmp_name[64]; |
| 1343 | |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1344 | /* param validation */ |
| 1345 | if (!obj_buf || obj_buf_sz <= 0) |
| 1346 | return NULL; |
| 1347 | |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1348 | if (!name) { |
| 1349 | snprintf(tmp_name, sizeof(tmp_name), "%lx-%lx", |
| 1350 | (unsigned long)obj_buf, |
| 1351 | (unsigned long)obj_buf_sz); |
| 1352 | tmp_name[sizeof(tmp_name) - 1] = '\0'; |
| 1353 | name = tmp_name; |
| 1354 | } |
| 1355 | pr_debug("loading object '%s' from buffer\n", |
| 1356 | name); |
Wang Nan | 6c95639 | 2015-07-01 02:13:54 +0000 | [diff] [blame] | 1357 | |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1358 | return __bpf_object__open(name, obj_buf, obj_buf_sz); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1359 | } |
| 1360 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1361 | int bpf_object__unload(struct bpf_object *obj) |
| 1362 | { |
| 1363 | size_t i; |
| 1364 | |
| 1365 | if (!obj) |
| 1366 | return -EINVAL; |
| 1367 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1368 | for (i = 0; i < obj->nr_maps; i++) |
| 1369 | zclose(obj->maps[i].fd); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1370 | |
Wang Nan | 55cffde | 2015-07-01 02:14:07 +0000 | [diff] [blame] | 1371 | for (i = 0; i < obj->nr_programs; i++) |
| 1372 | bpf_program__unload(&obj->programs[i]); |
| 1373 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1374 | return 0; |
| 1375 | } |
| 1376 | |
| 1377 | int bpf_object__load(struct bpf_object *obj) |
| 1378 | { |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1379 | int err; |
| 1380 | |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1381 | if (!obj) |
| 1382 | return -EINVAL; |
| 1383 | |
| 1384 | if (obj->loaded) { |
| 1385 | pr_warning("object should not be loaded twice\n"); |
| 1386 | return -EINVAL; |
| 1387 | } |
| 1388 | |
| 1389 | obj->loaded = true; |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1390 | |
| 1391 | CHECK_ERR(bpf_object__create_maps(obj), err, out); |
| 1392 | CHECK_ERR(bpf_object__relocate(obj), err, out); |
| 1393 | CHECK_ERR(bpf_object__load_progs(obj), err, out); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1394 | |
| 1395 | return 0; |
| 1396 | out: |
| 1397 | bpf_object__unload(obj); |
| 1398 | pr_warning("failed to load object '%s'\n", obj->path); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1399 | return err; |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1400 | } |
| 1401 | |
Joe Stringer | f367540 | 2017-01-26 13:19:56 -0800 | [diff] [blame] | 1402 | static int check_path(const char *path) |
| 1403 | { |
| 1404 | struct statfs st_fs; |
| 1405 | char *dname, *dir; |
| 1406 | int err = 0; |
| 1407 | |
| 1408 | if (path == NULL) |
| 1409 | return -EINVAL; |
| 1410 | |
| 1411 | dname = strdup(path); |
| 1412 | if (dname == NULL) |
| 1413 | return -ENOMEM; |
| 1414 | |
| 1415 | dir = dirname(dname); |
| 1416 | if (statfs(dir, &st_fs)) { |
| 1417 | pr_warning("failed to statfs %s: %s\n", dir, strerror(errno)); |
| 1418 | err = -errno; |
| 1419 | } |
| 1420 | free(dname); |
| 1421 | |
| 1422 | if (!err && st_fs.f_type != BPF_FS_MAGIC) { |
| 1423 | pr_warning("specified path %s is not on BPF FS\n", path); |
| 1424 | err = -EINVAL; |
| 1425 | } |
| 1426 | |
| 1427 | return err; |
| 1428 | } |
| 1429 | |
| 1430 | int bpf_program__pin_instance(struct bpf_program *prog, const char *path, |
| 1431 | int instance) |
| 1432 | { |
| 1433 | int err; |
| 1434 | |
| 1435 | err = check_path(path); |
| 1436 | if (err) |
| 1437 | return err; |
| 1438 | |
| 1439 | if (prog == NULL) { |
| 1440 | pr_warning("invalid program pointer\n"); |
| 1441 | return -EINVAL; |
| 1442 | } |
| 1443 | |
| 1444 | if (instance < 0 || instance >= prog->instances.nr) { |
| 1445 | pr_warning("invalid prog instance %d of prog %s (max %d)\n", |
| 1446 | instance, prog->section_name, prog->instances.nr); |
| 1447 | return -EINVAL; |
| 1448 | } |
| 1449 | |
| 1450 | if (bpf_obj_pin(prog->instances.fds[instance], path)) { |
| 1451 | pr_warning("failed to pin program: %s\n", strerror(errno)); |
| 1452 | return -errno; |
| 1453 | } |
| 1454 | pr_debug("pinned program '%s'\n", path); |
| 1455 | |
| 1456 | return 0; |
| 1457 | } |
| 1458 | |
| 1459 | static int make_dir(const char *path) |
| 1460 | { |
| 1461 | int err = 0; |
| 1462 | |
| 1463 | if (mkdir(path, 0700) && errno != EEXIST) |
| 1464 | err = -errno; |
| 1465 | |
| 1466 | if (err) |
| 1467 | pr_warning("failed to mkdir %s: %s\n", path, strerror(-err)); |
| 1468 | return err; |
| 1469 | } |
| 1470 | |
| 1471 | int bpf_program__pin(struct bpf_program *prog, const char *path) |
| 1472 | { |
| 1473 | int i, err; |
| 1474 | |
| 1475 | err = check_path(path); |
| 1476 | if (err) |
| 1477 | return err; |
| 1478 | |
| 1479 | if (prog == NULL) { |
| 1480 | pr_warning("invalid program pointer\n"); |
| 1481 | return -EINVAL; |
| 1482 | } |
| 1483 | |
| 1484 | if (prog->instances.nr <= 0) { |
| 1485 | pr_warning("no instances of prog %s to pin\n", |
| 1486 | prog->section_name); |
| 1487 | return -EINVAL; |
| 1488 | } |
| 1489 | |
| 1490 | err = make_dir(path); |
| 1491 | if (err) |
| 1492 | return err; |
| 1493 | |
| 1494 | for (i = 0; i < prog->instances.nr; i++) { |
| 1495 | char buf[PATH_MAX]; |
| 1496 | int len; |
| 1497 | |
| 1498 | len = snprintf(buf, PATH_MAX, "%s/%d", path, i); |
| 1499 | if (len < 0) |
| 1500 | return -EINVAL; |
| 1501 | else if (len >= PATH_MAX) |
| 1502 | return -ENAMETOOLONG; |
| 1503 | |
| 1504 | err = bpf_program__pin_instance(prog, buf, i); |
| 1505 | if (err) |
| 1506 | return err; |
| 1507 | } |
| 1508 | |
| 1509 | return 0; |
| 1510 | } |
| 1511 | |
Joe Stringer | b6989f3 | 2017-01-26 13:19:57 -0800 | [diff] [blame] | 1512 | int bpf_map__pin(struct bpf_map *map, const char *path) |
| 1513 | { |
| 1514 | int err; |
| 1515 | |
| 1516 | err = check_path(path); |
| 1517 | if (err) |
| 1518 | return err; |
| 1519 | |
| 1520 | if (map == NULL) { |
| 1521 | pr_warning("invalid map pointer\n"); |
| 1522 | return -EINVAL; |
| 1523 | } |
| 1524 | |
| 1525 | if (bpf_obj_pin(map->fd, path)) { |
| 1526 | pr_warning("failed to pin map: %s\n", strerror(errno)); |
| 1527 | return -errno; |
| 1528 | } |
| 1529 | |
| 1530 | pr_debug("pinned map '%s'\n", path); |
| 1531 | return 0; |
| 1532 | } |
| 1533 | |
Joe Stringer | d5148d8 | 2017-01-26 13:19:58 -0800 | [diff] [blame] | 1534 | int bpf_object__pin(struct bpf_object *obj, const char *path) |
| 1535 | { |
| 1536 | struct bpf_program *prog; |
| 1537 | struct bpf_map *map; |
| 1538 | int err; |
| 1539 | |
| 1540 | if (!obj) |
| 1541 | return -ENOENT; |
| 1542 | |
| 1543 | if (!obj->loaded) { |
| 1544 | pr_warning("object not yet loaded; load it first\n"); |
| 1545 | return -ENOENT; |
| 1546 | } |
| 1547 | |
| 1548 | err = make_dir(path); |
| 1549 | if (err) |
| 1550 | return err; |
| 1551 | |
| 1552 | bpf_map__for_each(map, obj) { |
| 1553 | char buf[PATH_MAX]; |
| 1554 | int len; |
| 1555 | |
| 1556 | len = snprintf(buf, PATH_MAX, "%s/%s", path, |
| 1557 | bpf_map__name(map)); |
| 1558 | if (len < 0) |
| 1559 | return -EINVAL; |
| 1560 | else if (len >= PATH_MAX) |
| 1561 | return -ENAMETOOLONG; |
| 1562 | |
| 1563 | err = bpf_map__pin(map, buf); |
| 1564 | if (err) |
| 1565 | return err; |
| 1566 | } |
| 1567 | |
| 1568 | bpf_object__for_each_program(prog, obj) { |
| 1569 | char buf[PATH_MAX]; |
| 1570 | int len; |
| 1571 | |
| 1572 | len = snprintf(buf, PATH_MAX, "%s/%s", path, |
| 1573 | prog->section_name); |
| 1574 | if (len < 0) |
| 1575 | return -EINVAL; |
| 1576 | else if (len >= PATH_MAX) |
| 1577 | return -ENAMETOOLONG; |
| 1578 | |
| 1579 | err = bpf_program__pin(prog, buf); |
| 1580 | if (err) |
| 1581 | return err; |
| 1582 | } |
| 1583 | |
| 1584 | return 0; |
| 1585 | } |
| 1586 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1587 | void bpf_object__close(struct bpf_object *obj) |
| 1588 | { |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 1589 | size_t i; |
| 1590 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1591 | if (!obj) |
| 1592 | return; |
| 1593 | |
Wang Nan | 10931d2 | 2016-11-26 07:03:26 +0000 | [diff] [blame] | 1594 | if (obj->clear_priv) |
| 1595 | obj->clear_priv(obj, obj->priv); |
| 1596 | |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1597 | bpf_object__elf_finish(obj); |
Wang Nan | 52d3352 | 2015-07-01 02:14:04 +0000 | [diff] [blame] | 1598 | bpf_object__unload(obj); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1599 | |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1600 | for (i = 0; i < obj->nr_maps; i++) { |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 1601 | zfree(&obj->maps[i].name); |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1602 | if (obj->maps[i].clear_priv) |
| 1603 | obj->maps[i].clear_priv(&obj->maps[i], |
| 1604 | obj->maps[i].priv); |
| 1605 | obj->maps[i].priv = NULL; |
| 1606 | obj->maps[i].clear_priv = NULL; |
| 1607 | } |
| 1608 | zfree(&obj->maps); |
| 1609 | obj->nr_maps = 0; |
Wang Nan | a5b8bd4 | 2015-07-01 02:14:00 +0000 | [diff] [blame] | 1610 | |
| 1611 | if (obj->programs && obj->nr_programs) { |
| 1612 | for (i = 0; i < obj->nr_programs; i++) |
| 1613 | bpf_program__exit(&obj->programs[i]); |
| 1614 | } |
| 1615 | zfree(&obj->programs); |
| 1616 | |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 1617 | list_del(&obj->list); |
Wang Nan | 1a5e3fb | 2015-07-01 02:13:53 +0000 | [diff] [blame] | 1618 | free(obj); |
| 1619 | } |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1620 | |
Wang Nan | 9a208ef | 2015-07-01 02:14:10 +0000 | [diff] [blame] | 1621 | struct bpf_object * |
| 1622 | bpf_object__next(struct bpf_object *prev) |
| 1623 | { |
| 1624 | struct bpf_object *next; |
| 1625 | |
| 1626 | if (!prev) |
| 1627 | next = list_first_entry(&bpf_objects_list, |
| 1628 | struct bpf_object, |
| 1629 | list); |
| 1630 | else |
| 1631 | next = list_next_entry(prev, list); |
| 1632 | |
| 1633 | /* Empty list is noticed here so don't need checking on entry. */ |
| 1634 | if (&next->list == &bpf_objects_list) |
| 1635 | return NULL; |
| 1636 | |
| 1637 | return next; |
| 1638 | } |
| 1639 | |
Arnaldo Carvalho de Melo | a7fe045 | 2016-06-03 12:22:51 -0300 | [diff] [blame] | 1640 | const char *bpf_object__name(struct bpf_object *obj) |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1641 | { |
Arnaldo Carvalho de Melo | a7fe045 | 2016-06-03 12:22:51 -0300 | [diff] [blame] | 1642 | return obj ? obj->path : ERR_PTR(-EINVAL); |
Wang Nan | acf860a | 2015-08-27 02:30:55 +0000 | [diff] [blame] | 1643 | } |
| 1644 | |
Arnaldo Carvalho de Melo | a7fe045 | 2016-06-03 12:22:51 -0300 | [diff] [blame] | 1645 | unsigned int bpf_object__kversion(struct bpf_object *obj) |
Wang Nan | 45825d8 | 2015-11-06 13:49:38 +0000 | [diff] [blame] | 1646 | { |
Arnaldo Carvalho de Melo | a7fe045 | 2016-06-03 12:22:51 -0300 | [diff] [blame] | 1647 | return obj ? obj->kern_version : 0; |
Wang Nan | 45825d8 | 2015-11-06 13:49:38 +0000 | [diff] [blame] | 1648 | } |
| 1649 | |
Wang Nan | 10931d2 | 2016-11-26 07:03:26 +0000 | [diff] [blame] | 1650 | int bpf_object__set_priv(struct bpf_object *obj, void *priv, |
| 1651 | bpf_object_clear_priv_t clear_priv) |
| 1652 | { |
| 1653 | if (obj->priv && obj->clear_priv) |
| 1654 | obj->clear_priv(obj, obj->priv); |
| 1655 | |
| 1656 | obj->priv = priv; |
| 1657 | obj->clear_priv = clear_priv; |
| 1658 | return 0; |
| 1659 | } |
| 1660 | |
| 1661 | void *bpf_object__priv(struct bpf_object *obj) |
| 1662 | { |
| 1663 | return obj ? obj->priv : ERR_PTR(-EINVAL); |
| 1664 | } |
| 1665 | |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1666 | struct bpf_program * |
| 1667 | bpf_program__next(struct bpf_program *prev, struct bpf_object *obj) |
| 1668 | { |
| 1669 | size_t idx; |
| 1670 | |
| 1671 | if (!obj->programs) |
| 1672 | return NULL; |
| 1673 | /* First handler */ |
| 1674 | if (prev == NULL) |
| 1675 | return &obj->programs[0]; |
| 1676 | |
| 1677 | if (prev->obj != obj) { |
| 1678 | pr_warning("error: program handler doesn't match object\n"); |
| 1679 | return NULL; |
| 1680 | } |
| 1681 | |
| 1682 | idx = (prev - obj->programs) + 1; |
| 1683 | if (idx >= obj->nr_programs) |
| 1684 | return NULL; |
| 1685 | return &obj->programs[idx]; |
| 1686 | } |
| 1687 | |
Arnaldo Carvalho de Melo | edb13ed | 2016-06-03 12:38:21 -0300 | [diff] [blame] | 1688 | int bpf_program__set_priv(struct bpf_program *prog, void *priv, |
| 1689 | bpf_program_clear_priv_t clear_priv) |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1690 | { |
| 1691 | if (prog->priv && prog->clear_priv) |
| 1692 | prog->clear_priv(prog, prog->priv); |
| 1693 | |
| 1694 | prog->priv = priv; |
| 1695 | prog->clear_priv = clear_priv; |
| 1696 | return 0; |
| 1697 | } |
| 1698 | |
Arnaldo Carvalho de Melo | be834ff | 2016-06-03 12:36:39 -0300 | [diff] [blame] | 1699 | void *bpf_program__priv(struct bpf_program *prog) |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1700 | { |
Arnaldo Carvalho de Melo | be834ff | 2016-06-03 12:36:39 -0300 | [diff] [blame] | 1701 | return prog ? prog->priv : ERR_PTR(-EINVAL); |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1702 | } |
| 1703 | |
Namhyung Kim | 715f8db | 2015-11-03 20:21:05 +0900 | [diff] [blame] | 1704 | const char *bpf_program__title(struct bpf_program *prog, bool needs_copy) |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1705 | { |
| 1706 | const char *title; |
| 1707 | |
| 1708 | title = prog->section_name; |
Namhyung Kim | 715f8db | 2015-11-03 20:21:05 +0900 | [diff] [blame] | 1709 | if (needs_copy) { |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1710 | title = strdup(title); |
| 1711 | if (!title) { |
| 1712 | pr_warning("failed to strdup program title\n"); |
Wang Nan | 6371ca3b | 2015-11-06 13:49:37 +0000 | [diff] [blame] | 1713 | return ERR_PTR(-ENOMEM); |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1714 | } |
| 1715 | } |
| 1716 | |
| 1717 | return title; |
| 1718 | } |
| 1719 | |
| 1720 | int bpf_program__fd(struct bpf_program *prog) |
| 1721 | { |
Wang Nan | b580563 | 2015-11-16 12:10:09 +0000 | [diff] [blame] | 1722 | return bpf_program__nth_fd(prog, 0); |
| 1723 | } |
| 1724 | |
| 1725 | int bpf_program__set_prep(struct bpf_program *prog, int nr_instances, |
| 1726 | bpf_program_prep_t prep) |
| 1727 | { |
| 1728 | int *instances_fds; |
| 1729 | |
| 1730 | if (nr_instances <= 0 || !prep) |
| 1731 | return -EINVAL; |
| 1732 | |
| 1733 | if (prog->instances.nr > 0 || prog->instances.fds) { |
| 1734 | pr_warning("Can't set pre-processor after loading\n"); |
| 1735 | return -EINVAL; |
| 1736 | } |
| 1737 | |
| 1738 | instances_fds = malloc(sizeof(int) * nr_instances); |
| 1739 | if (!instances_fds) { |
| 1740 | pr_warning("alloc memory failed for fds\n"); |
| 1741 | return -ENOMEM; |
| 1742 | } |
| 1743 | |
| 1744 | /* fill all fd with -1 */ |
| 1745 | memset(instances_fds, -1, sizeof(int) * nr_instances); |
| 1746 | |
| 1747 | prog->instances.nr = nr_instances; |
| 1748 | prog->instances.fds = instances_fds; |
| 1749 | prog->preprocessor = prep; |
| 1750 | return 0; |
| 1751 | } |
| 1752 | |
| 1753 | int bpf_program__nth_fd(struct bpf_program *prog, int n) |
| 1754 | { |
| 1755 | int fd; |
| 1756 | |
| 1757 | if (n >= prog->instances.nr || n < 0) { |
| 1758 | pr_warning("Can't get the %dth fd from program %s: only %d instances\n", |
| 1759 | n, prog->section_name, prog->instances.nr); |
| 1760 | return -EINVAL; |
| 1761 | } |
| 1762 | |
| 1763 | fd = prog->instances.fds[n]; |
| 1764 | if (fd < 0) { |
| 1765 | pr_warning("%dth instance of program '%s' is invalid\n", |
| 1766 | n, prog->section_name); |
| 1767 | return -ENOENT; |
| 1768 | } |
| 1769 | |
| 1770 | return fd; |
Wang Nan | aa9b1ac | 2015-07-01 02:14:08 +0000 | [diff] [blame] | 1771 | } |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1772 | |
Alexei Starovoitov | dd26b7f | 2017-03-30 21:45:40 -0700 | [diff] [blame] | 1773 | void bpf_program__set_type(struct bpf_program *prog, enum bpf_prog_type type) |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 1774 | { |
| 1775 | prog->type = type; |
| 1776 | } |
| 1777 | |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 1778 | static bool bpf_program__is_type(struct bpf_program *prog, |
| 1779 | enum bpf_prog_type type) |
| 1780 | { |
| 1781 | return prog ? (prog->type == type) : false; |
| 1782 | } |
| 1783 | |
Joe Stringer | ed79407 | 2017-01-22 17:11:23 -0800 | [diff] [blame] | 1784 | #define BPF_PROG_TYPE_FNS(NAME, TYPE) \ |
| 1785 | int bpf_program__set_##NAME(struct bpf_program *prog) \ |
| 1786 | { \ |
| 1787 | if (!prog) \ |
| 1788 | return -EINVAL; \ |
| 1789 | bpf_program__set_type(prog, TYPE); \ |
| 1790 | return 0; \ |
| 1791 | } \ |
| 1792 | \ |
| 1793 | bool bpf_program__is_##NAME(struct bpf_program *prog) \ |
| 1794 | { \ |
| 1795 | return bpf_program__is_type(prog, TYPE); \ |
| 1796 | } \ |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 1797 | |
Joe Stringer | 7803ba7 | 2017-01-22 17:11:24 -0800 | [diff] [blame] | 1798 | BPF_PROG_TYPE_FNS(socket_filter, BPF_PROG_TYPE_SOCKET_FILTER); |
Joe Stringer | ed79407 | 2017-01-22 17:11:23 -0800 | [diff] [blame] | 1799 | BPF_PROG_TYPE_FNS(kprobe, BPF_PROG_TYPE_KPROBE); |
Joe Stringer | 7803ba7 | 2017-01-22 17:11:24 -0800 | [diff] [blame] | 1800 | BPF_PROG_TYPE_FNS(sched_cls, BPF_PROG_TYPE_SCHED_CLS); |
| 1801 | BPF_PROG_TYPE_FNS(sched_act, BPF_PROG_TYPE_SCHED_ACT); |
Joe Stringer | ed79407 | 2017-01-22 17:11:23 -0800 | [diff] [blame] | 1802 | BPF_PROG_TYPE_FNS(tracepoint, BPF_PROG_TYPE_TRACEPOINT); |
Joe Stringer | 7803ba7 | 2017-01-22 17:11:24 -0800 | [diff] [blame] | 1803 | BPF_PROG_TYPE_FNS(xdp, BPF_PROG_TYPE_XDP); |
| 1804 | BPF_PROG_TYPE_FNS(perf_event, BPF_PROG_TYPE_PERF_EVENT); |
Wang Nan | 5f44e4c8 | 2016-07-13 10:44:01 +0000 | [diff] [blame] | 1805 | |
Quentin Monnet | d77be68 | 2018-01-16 15:51:48 -0800 | [diff] [blame] | 1806 | #define BPF_PROG_SEC(string, type) { string, sizeof(string) - 1, type } |
Roman Gushchin | 583c900 | 2017-12-13 15:18:51 +0000 | [diff] [blame] | 1807 | static const struct { |
| 1808 | const char *sec; |
| 1809 | size_t len; |
| 1810 | enum bpf_prog_type prog_type; |
| 1811 | } section_names[] = { |
| 1812 | BPF_PROG_SEC("socket", BPF_PROG_TYPE_SOCKET_FILTER), |
| 1813 | BPF_PROG_SEC("kprobe/", BPF_PROG_TYPE_KPROBE), |
| 1814 | BPF_PROG_SEC("kretprobe/", BPF_PROG_TYPE_KPROBE), |
| 1815 | BPF_PROG_SEC("tracepoint/", BPF_PROG_TYPE_TRACEPOINT), |
| 1816 | BPF_PROG_SEC("xdp", BPF_PROG_TYPE_XDP), |
| 1817 | BPF_PROG_SEC("perf_event", BPF_PROG_TYPE_PERF_EVENT), |
| 1818 | BPF_PROG_SEC("cgroup/skb", BPF_PROG_TYPE_CGROUP_SKB), |
| 1819 | BPF_PROG_SEC("cgroup/sock", BPF_PROG_TYPE_CGROUP_SOCK), |
| 1820 | BPF_PROG_SEC("cgroup/dev", BPF_PROG_TYPE_CGROUP_DEVICE), |
| 1821 | BPF_PROG_SEC("sockops", BPF_PROG_TYPE_SOCK_OPS), |
| 1822 | BPF_PROG_SEC("sk_skb", BPF_PROG_TYPE_SK_SKB), |
| 1823 | }; |
| 1824 | #undef BPF_PROG_SEC |
| 1825 | |
| 1826 | static enum bpf_prog_type bpf_program__guess_type(struct bpf_program *prog) |
| 1827 | { |
| 1828 | int i; |
| 1829 | |
| 1830 | if (!prog->section_name) |
| 1831 | goto err; |
| 1832 | |
| 1833 | for (i = 0; i < ARRAY_SIZE(section_names); i++) |
| 1834 | if (strncmp(prog->section_name, section_names[i].sec, |
| 1835 | section_names[i].len) == 0) |
| 1836 | return section_names[i].prog_type; |
| 1837 | |
| 1838 | err: |
| 1839 | pr_warning("failed to guess program type based on section name %s\n", |
| 1840 | prog->section_name); |
| 1841 | |
| 1842 | return BPF_PROG_TYPE_UNSPEC; |
| 1843 | } |
| 1844 | |
Arnaldo Carvalho de Melo | 6e009e6 | 2016-06-03 12:15:52 -0300 | [diff] [blame] | 1845 | int bpf_map__fd(struct bpf_map *map) |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1846 | { |
Arnaldo Carvalho de Melo | 6e009e6 | 2016-06-03 12:15:52 -0300 | [diff] [blame] | 1847 | return map ? map->fd : -EINVAL; |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1848 | } |
| 1849 | |
Arnaldo Carvalho de Melo | 53897a7 | 2016-06-02 14:21:06 -0300 | [diff] [blame] | 1850 | const struct bpf_map_def *bpf_map__def(struct bpf_map *map) |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1851 | { |
Arnaldo Carvalho de Melo | 53897a7 | 2016-06-02 14:21:06 -0300 | [diff] [blame] | 1852 | return map ? &map->def : ERR_PTR(-EINVAL); |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1853 | } |
| 1854 | |
Arnaldo Carvalho de Melo | 009ad5d | 2016-06-02 11:02:05 -0300 | [diff] [blame] | 1855 | const char *bpf_map__name(struct bpf_map *map) |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 1856 | { |
Arnaldo Carvalho de Melo | 009ad5d | 2016-06-02 11:02:05 -0300 | [diff] [blame] | 1857 | return map ? map->name : NULL; |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 1858 | } |
| 1859 | |
Arnaldo Carvalho de Melo | edb13ed | 2016-06-03 12:38:21 -0300 | [diff] [blame] | 1860 | int bpf_map__set_priv(struct bpf_map *map, void *priv, |
| 1861 | bpf_map_clear_priv_t clear_priv) |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1862 | { |
| 1863 | if (!map) |
| 1864 | return -EINVAL; |
| 1865 | |
| 1866 | if (map->priv) { |
| 1867 | if (map->clear_priv) |
| 1868 | map->clear_priv(map, map->priv); |
| 1869 | } |
| 1870 | |
| 1871 | map->priv = priv; |
| 1872 | map->clear_priv = clear_priv; |
| 1873 | return 0; |
| 1874 | } |
| 1875 | |
Arnaldo Carvalho de Melo | b4cbfa5 | 2016-06-02 10:51:59 -0300 | [diff] [blame] | 1876 | void *bpf_map__priv(struct bpf_map *map) |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1877 | { |
Arnaldo Carvalho de Melo | b4cbfa5 | 2016-06-02 10:51:59 -0300 | [diff] [blame] | 1878 | return map ? map->priv : ERR_PTR(-EINVAL); |
Wang Nan | 9d759a9 | 2015-11-27 08:47:35 +0000 | [diff] [blame] | 1879 | } |
| 1880 | |
| 1881 | struct bpf_map * |
| 1882 | bpf_map__next(struct bpf_map *prev, struct bpf_object *obj) |
| 1883 | { |
| 1884 | size_t idx; |
| 1885 | struct bpf_map *s, *e; |
| 1886 | |
| 1887 | if (!obj || !obj->maps) |
| 1888 | return NULL; |
| 1889 | |
| 1890 | s = obj->maps; |
| 1891 | e = obj->maps + obj->nr_maps; |
| 1892 | |
| 1893 | if (prev == NULL) |
| 1894 | return s; |
| 1895 | |
| 1896 | if ((prev < s) || (prev >= e)) { |
| 1897 | pr_warning("error in %s: map handler doesn't belong to object\n", |
| 1898 | __func__); |
| 1899 | return NULL; |
| 1900 | } |
| 1901 | |
| 1902 | idx = (prev - obj->maps) + 1; |
| 1903 | if (idx >= obj->nr_maps) |
| 1904 | return NULL; |
| 1905 | return &obj->maps[idx]; |
| 1906 | } |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 1907 | |
| 1908 | struct bpf_map * |
Arnaldo Carvalho de Melo | a7fe045 | 2016-06-03 12:22:51 -0300 | [diff] [blame] | 1909 | 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] | 1910 | { |
| 1911 | struct bpf_map *pos; |
| 1912 | |
| 1913 | bpf_map__for_each(pos, obj) { |
Wang Nan | 973170e | 2015-12-08 02:25:29 +0000 | [diff] [blame] | 1914 | if (pos->name && !strcmp(pos->name, name)) |
Wang Nan | 561bbcc | 2015-11-27 08:47:36 +0000 | [diff] [blame] | 1915 | return pos; |
| 1916 | } |
| 1917 | return NULL; |
| 1918 | } |
Wang Nan | 5a6acad | 2016-11-26 07:03:27 +0000 | [diff] [blame] | 1919 | |
| 1920 | struct bpf_map * |
| 1921 | bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset) |
| 1922 | { |
| 1923 | int i; |
| 1924 | |
| 1925 | for (i = 0; i < obj->nr_maps; i++) { |
| 1926 | if (obj->maps[i].offset == offset) |
| 1927 | return &obj->maps[i]; |
| 1928 | } |
| 1929 | return ERR_PTR(-ENOENT); |
| 1930 | } |
Joe Stringer | e28ff1a | 2017-01-22 17:11:25 -0800 | [diff] [blame] | 1931 | |
| 1932 | long libbpf_get_error(const void *ptr) |
| 1933 | { |
| 1934 | if (IS_ERR(ptr)) |
| 1935 | return PTR_ERR(ptr); |
| 1936 | return 0; |
| 1937 | } |
John Fastabend | 6f6d33f | 2017-08-15 22:34:22 -0700 | [diff] [blame] | 1938 | |
| 1939 | int bpf_prog_load(const char *file, enum bpf_prog_type type, |
| 1940 | struct bpf_object **pobj, int *prog_fd) |
| 1941 | { |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 1942 | struct bpf_program *prog, *first_prog = NULL; |
John Fastabend | 6f6d33f | 2017-08-15 22:34:22 -0700 | [diff] [blame] | 1943 | struct bpf_object *obj; |
| 1944 | int err; |
| 1945 | |
| 1946 | obj = bpf_object__open(file); |
| 1947 | if (IS_ERR(obj)) |
| 1948 | return -ENOENT; |
| 1949 | |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 1950 | bpf_object__for_each_program(prog, obj) { |
| 1951 | /* |
| 1952 | * If type is not specified, try to guess it based on |
| 1953 | * section name. |
| 1954 | */ |
| 1955 | if (type == BPF_PROG_TYPE_UNSPEC) { |
| 1956 | type = bpf_program__guess_type(prog); |
| 1957 | if (type == BPF_PROG_TYPE_UNSPEC) { |
| 1958 | bpf_object__close(obj); |
| 1959 | return -EINVAL; |
| 1960 | } |
| 1961 | } |
| 1962 | |
| 1963 | bpf_program__set_type(prog, type); |
| 1964 | if (prog->idx != obj->efile.text_shndx && !first_prog) |
| 1965 | first_prog = prog; |
| 1966 | } |
| 1967 | |
| 1968 | if (!first_prog) { |
| 1969 | pr_warning("object file doesn't contain bpf program\n"); |
John Fastabend | 6f6d33f | 2017-08-15 22:34:22 -0700 | [diff] [blame] | 1970 | bpf_object__close(obj); |
| 1971 | return -ENOENT; |
| 1972 | } |
| 1973 | |
John Fastabend | 6f6d33f | 2017-08-15 22:34:22 -0700 | [diff] [blame] | 1974 | err = bpf_object__load(obj); |
| 1975 | if (err) { |
| 1976 | bpf_object__close(obj); |
| 1977 | return -EINVAL; |
| 1978 | } |
| 1979 | |
| 1980 | *pobj = obj; |
Alexei Starovoitov | 48cca7e | 2017-12-14 17:55:10 -0800 | [diff] [blame] | 1981 | *prog_fd = bpf_program__fd(first_prog); |
John Fastabend | 6f6d33f | 2017-08-15 22:34:22 -0700 | [diff] [blame] | 1982 | return 0; |
| 1983 | } |