Jiri Pirko | 1d129d1 | 2015-01-19 16:56:29 +0100 | [diff] [blame] | 1 | /* |
| 2 | * tc_bpf.c BPF common code |
| 3 | * |
| 4 | * This program is free software; you can distribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Daniel Borkmann <dborkman@redhat.com> |
| 10 | * Jiri Pirko <jiri@resnulli.us> |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 11 | * Alexei Starovoitov <ast@plumgrid.com> |
Jiri Pirko | 1d129d1 | 2015-01-19 16:56:29 +0100 | [diff] [blame] | 12 | */ |
| 13 | |
| 14 | #include <stdio.h> |
| 15 | #include <stdlib.h> |
| 16 | #include <unistd.h> |
| 17 | #include <string.h> |
| 18 | #include <stdbool.h> |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 19 | #include <stdint.h> |
Jiri Pirko | 1d129d1 | 2015-01-19 16:56:29 +0100 | [diff] [blame] | 20 | #include <errno.h> |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 21 | #include <fcntl.h> |
| 22 | #include <stdarg.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/stat.h> |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 25 | #include <sys/un.h> |
Jiri Pirko | 1d129d1 | 2015-01-19 16:56:29 +0100 | [diff] [blame] | 26 | #include <linux/filter.h> |
| 27 | #include <linux/netlink.h> |
| 28 | #include <linux/rtnetlink.h> |
| 29 | |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 30 | #ifdef HAVE_ELF |
| 31 | #include <libelf.h> |
| 32 | #include <gelf.h> |
| 33 | #endif |
| 34 | |
Jiri Pirko | 1d129d1 | 2015-01-19 16:56:29 +0100 | [diff] [blame] | 35 | #include "utils.h" |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 36 | |
| 37 | #include "bpf_elf.h" |
| 38 | #include "bpf_scm.h" |
| 39 | |
Jiri Pirko | 1d129d1 | 2015-01-19 16:56:29 +0100 | [diff] [blame] | 40 | #include "tc_util.h" |
| 41 | #include "tc_bpf.h" |
| 42 | |
| 43 | int bpf_parse_string(char *arg, bool from_file, __u16 *bpf_len, |
| 44 | char **bpf_string, bool *need_release, |
| 45 | const char separator) |
| 46 | { |
| 47 | char sp; |
| 48 | |
| 49 | if (from_file) { |
| 50 | size_t tmp_len, op_len = sizeof("65535 255 255 4294967295,"); |
| 51 | char *tmp_string; |
| 52 | FILE *fp; |
| 53 | |
| 54 | tmp_len = sizeof("4096,") + BPF_MAXINSNS * op_len; |
| 55 | tmp_string = malloc(tmp_len); |
| 56 | if (tmp_string == NULL) |
| 57 | return -ENOMEM; |
| 58 | |
| 59 | memset(tmp_string, 0, tmp_len); |
| 60 | |
| 61 | fp = fopen(arg, "r"); |
| 62 | if (fp == NULL) { |
| 63 | perror("Cannot fopen"); |
| 64 | free(tmp_string); |
| 65 | return -ENOENT; |
| 66 | } |
| 67 | |
| 68 | if (!fgets(tmp_string, tmp_len, fp)) { |
| 69 | free(tmp_string); |
| 70 | fclose(fp); |
| 71 | return -EIO; |
| 72 | } |
| 73 | |
| 74 | fclose(fp); |
| 75 | |
| 76 | *need_release = true; |
| 77 | *bpf_string = tmp_string; |
| 78 | } else { |
| 79 | *need_release = false; |
| 80 | *bpf_string = arg; |
| 81 | } |
| 82 | |
| 83 | if (sscanf(*bpf_string, "%hu%c", bpf_len, &sp) != 2 || |
| 84 | sp != separator) { |
| 85 | if (*need_release) |
| 86 | free(*bpf_string); |
| 87 | return -EINVAL; |
| 88 | } |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | int bpf_parse_ops(int argc, char **argv, struct sock_filter *bpf_ops, |
| 94 | bool from_file) |
| 95 | { |
| 96 | char *bpf_string, *token, separator = ','; |
| 97 | int ret = 0, i = 0; |
| 98 | bool need_release; |
| 99 | __u16 bpf_len = 0; |
| 100 | |
| 101 | if (argc < 1) |
| 102 | return -EINVAL; |
| 103 | if (bpf_parse_string(argv[0], from_file, &bpf_len, &bpf_string, |
| 104 | &need_release, separator)) |
| 105 | return -EINVAL; |
| 106 | if (bpf_len == 0 || bpf_len > BPF_MAXINSNS) { |
| 107 | ret = -EINVAL; |
| 108 | goto out; |
| 109 | } |
| 110 | |
| 111 | token = bpf_string; |
| 112 | while ((token = strchr(token, separator)) && (++token)[0]) { |
| 113 | if (i >= bpf_len) { |
| 114 | fprintf(stderr, "Real program length exceeds encoded " |
| 115 | "length parameter!\n"); |
| 116 | ret = -EINVAL; |
| 117 | goto out; |
| 118 | } |
| 119 | |
| 120 | if (sscanf(token, "%hu %hhu %hhu %u,", |
| 121 | &bpf_ops[i].code, &bpf_ops[i].jt, |
| 122 | &bpf_ops[i].jf, &bpf_ops[i].k) != 4) { |
| 123 | fprintf(stderr, "Error at instruction %d!\n", i); |
| 124 | ret = -EINVAL; |
| 125 | goto out; |
| 126 | } |
| 127 | |
| 128 | i++; |
| 129 | } |
| 130 | |
| 131 | if (i != bpf_len) { |
| 132 | fprintf(stderr, "Parsed program length is less than encoded" |
| 133 | "length parameter!\n"); |
| 134 | ret = -EINVAL; |
| 135 | goto out; |
| 136 | } |
| 137 | ret = bpf_len; |
| 138 | |
| 139 | out: |
| 140 | if (need_release) |
| 141 | free(bpf_string); |
| 142 | |
| 143 | return ret; |
| 144 | } |
| 145 | |
| 146 | void bpf_print_ops(FILE *f, struct rtattr *bpf_ops, __u16 len) |
| 147 | { |
| 148 | struct sock_filter *ops = (struct sock_filter *) RTA_DATA(bpf_ops); |
| 149 | int i; |
| 150 | |
| 151 | if (len == 0) |
| 152 | return; |
| 153 | |
| 154 | fprintf(f, "bytecode \'%u,", len); |
| 155 | |
| 156 | for (i = 0; i < len - 1; i++) |
| 157 | fprintf(f, "%hu %hhu %hhu %u,", ops[i].code, ops[i].jt, |
| 158 | ops[i].jf, ops[i].k); |
| 159 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 160 | fprintf(f, "%hu %hhu %hhu %u\'", ops[i].code, ops[i].jt, |
Jiri Pirko | 1d129d1 | 2015-01-19 16:56:29 +0100 | [diff] [blame] | 161 | ops[i].jf, ops[i].k); |
| 162 | } |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 163 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 164 | const char *bpf_default_section(const enum bpf_prog_type type) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 165 | { |
| 166 | switch (type) { |
| 167 | case BPF_PROG_TYPE_SCHED_CLS: |
| 168 | return ELF_SECTION_CLASSIFIER; |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 169 | case BPF_PROG_TYPE_SCHED_ACT: |
| 170 | return ELF_SECTION_ACTION; |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 171 | default: |
| 172 | return NULL; |
| 173 | } |
| 174 | } |
| 175 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 176 | #ifdef HAVE_ELF |
| 177 | struct bpf_elf_sec_data { |
| 178 | GElf_Shdr sec_hdr; |
| 179 | char *sec_name; |
| 180 | Elf_Data *sec_data; |
| 181 | }; |
| 182 | |
| 183 | struct bpf_map_data { |
| 184 | int *fds; |
| 185 | const char *obj; |
| 186 | struct bpf_elf_st *st; |
| 187 | struct bpf_elf_map *ent; |
| 188 | }; |
| 189 | |
| 190 | /* If we provide a small buffer with log level enabled, the kernel |
| 191 | * could fail program load as no buffer space is available for the |
| 192 | * log and thus verifier fails. In case something doesn't pass the |
| 193 | * verifier we still want to hand something descriptive to the user. |
| 194 | */ |
| 195 | static char bpf_log_buf[65536]; |
Daniel Borkmann | d937a74 | 2015-04-28 13:37:42 +0200 | [diff] [blame] | 196 | static bool bpf_verbose; |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 197 | |
| 198 | static struct bpf_elf_st bpf_st; |
| 199 | |
| 200 | static int map_fds[ELF_MAX_MAPS]; |
| 201 | static struct bpf_elf_map map_ent[ELF_MAX_MAPS]; |
| 202 | |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 203 | static void bpf_dump_error(const char *format, ...) __check_format_string(1, 2); |
| 204 | static void bpf_dump_error(const char *format, ...) |
| 205 | { |
| 206 | va_list vl; |
| 207 | |
| 208 | va_start(vl, format); |
| 209 | vfprintf(stderr, format, vl); |
| 210 | va_end(vl); |
| 211 | |
Daniel Borkmann | d937a74 | 2015-04-28 13:37:42 +0200 | [diff] [blame] | 212 | if (bpf_log_buf[0]) { |
| 213 | fprintf(stderr, "%s\n", bpf_log_buf); |
| 214 | memset(bpf_log_buf, 0, sizeof(bpf_log_buf)); |
| 215 | } |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 216 | } |
| 217 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 218 | static void bpf_save_finfo(int file_fd) |
| 219 | { |
| 220 | struct stat st; |
| 221 | int ret; |
| 222 | |
| 223 | memset(&bpf_st, 0, sizeof(bpf_st)); |
| 224 | |
| 225 | ret = fstat(file_fd, &st); |
| 226 | if (ret < 0) { |
| 227 | fprintf(stderr, "Stat of elf file failed: %s\n", |
| 228 | strerror(errno)); |
| 229 | return; |
| 230 | } |
| 231 | |
| 232 | bpf_st.st_dev = st.st_dev; |
| 233 | bpf_st.st_ino = st.st_ino; |
| 234 | } |
| 235 | |
| 236 | static void bpf_clear_finfo(void) |
| 237 | { |
| 238 | memset(&bpf_st, 0, sizeof(bpf_st)); |
| 239 | } |
| 240 | |
| 241 | static bool bpf_may_skip_map_creation(int file_fd) |
| 242 | { |
| 243 | struct stat st; |
| 244 | int ret; |
| 245 | |
| 246 | ret = fstat(file_fd, &st); |
| 247 | if (ret < 0) { |
| 248 | fprintf(stderr, "Stat of elf file failed: %s\n", |
| 249 | strerror(errno)); |
| 250 | return false; |
| 251 | } |
| 252 | |
| 253 | return (bpf_st.st_dev == st.st_dev) && |
| 254 | (bpf_st.st_ino == st.st_ino); |
| 255 | } |
| 256 | |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 257 | static int bpf_create_map(enum bpf_map_type type, unsigned int size_key, |
| 258 | unsigned int size_value, unsigned int max_elem) |
| 259 | { |
| 260 | union bpf_attr attr = { |
| 261 | .map_type = type, |
| 262 | .key_size = size_key, |
| 263 | .value_size = size_value, |
| 264 | .max_entries = max_elem, |
| 265 | }; |
| 266 | |
| 267 | return bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); |
| 268 | } |
| 269 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 270 | static int bpf_update_map(int fd, const void *key, const void *value, |
| 271 | uint64_t flags) |
| 272 | { |
| 273 | union bpf_attr attr = { |
| 274 | .map_fd = fd, |
| 275 | .key = bpf_ptr_to_u64(key), |
| 276 | .value = bpf_ptr_to_u64(value), |
| 277 | .flags = flags, |
| 278 | }; |
| 279 | |
| 280 | return bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); |
| 281 | } |
| 282 | |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 283 | static int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns, |
| 284 | unsigned int len, const char *license) |
| 285 | { |
| 286 | union bpf_attr attr = { |
| 287 | .prog_type = type, |
| 288 | .insns = bpf_ptr_to_u64(insns), |
| 289 | .insn_cnt = len / sizeof(struct bpf_insn), |
| 290 | .license = bpf_ptr_to_u64(license), |
| 291 | .log_buf = bpf_ptr_to_u64(bpf_log_buf), |
| 292 | .log_size = sizeof(bpf_log_buf), |
| 293 | .log_level = 1, |
| 294 | }; |
| 295 | |
| 296 | return bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); |
| 297 | } |
| 298 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 299 | static int bpf_prog_attach(enum bpf_prog_type type, const char *sec, |
| 300 | const struct bpf_insn *insns, unsigned int size, |
| 301 | const char *license) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 302 | { |
| 303 | int prog_fd = bpf_prog_load(type, insns, size, license); |
| 304 | |
Daniel Borkmann | d937a74 | 2015-04-28 13:37:42 +0200 | [diff] [blame] | 305 | if (prog_fd < 0 || bpf_verbose) { |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 306 | bpf_dump_error("%s (section \'%s\'): %s\n", prog_fd < 0 ? |
Daniel Borkmann | d937a74 | 2015-04-28 13:37:42 +0200 | [diff] [blame] | 307 | "BPF program rejected" : |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 308 | "BPF program verification", |
| 309 | sec, strerror(errno)); |
Daniel Borkmann | d937a74 | 2015-04-28 13:37:42 +0200 | [diff] [blame] | 310 | } |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 311 | |
| 312 | return prog_fd; |
| 313 | } |
| 314 | |
| 315 | static int bpf_map_attach(enum bpf_map_type type, unsigned int size_key, |
| 316 | unsigned int size_value, unsigned int max_elem) |
| 317 | { |
| 318 | int map_fd = bpf_create_map(type, size_key, size_value, max_elem); |
| 319 | |
| 320 | if (map_fd < 0) |
| 321 | bpf_dump_error("BPF map rejected: %s\n", strerror(errno)); |
| 322 | |
| 323 | return map_fd; |
| 324 | } |
| 325 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 326 | static void bpf_maps_init(void) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 327 | { |
| 328 | int i; |
| 329 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 330 | memset(map_ent, 0, sizeof(map_ent)); |
| 331 | for (i = 0; i < ARRAY_SIZE(map_fds); i++) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 332 | map_fds[i] = -1; |
| 333 | } |
| 334 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 335 | static int bpf_maps_count(void) |
| 336 | { |
| 337 | int i, count = 0; |
| 338 | |
| 339 | for (i = 0; i < ARRAY_SIZE(map_fds); i++) { |
| 340 | if (map_fds[i] < 0) |
| 341 | break; |
| 342 | count++; |
| 343 | } |
| 344 | |
| 345 | return count; |
| 346 | } |
| 347 | |
| 348 | static void bpf_maps_destroy(void) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 349 | { |
| 350 | int i; |
| 351 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 352 | memset(map_ent, 0, sizeof(map_ent)); |
| 353 | for (i = 0; i < ARRAY_SIZE(map_fds); i++) { |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 354 | if (map_fds[i] >= 0) |
| 355 | close(map_fds[i]); |
| 356 | } |
| 357 | } |
| 358 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 359 | static int bpf_maps_attach(struct bpf_elf_map *maps, unsigned int num_maps) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 360 | { |
| 361 | int i, ret; |
| 362 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 363 | for (i = 0; (i < num_maps) && (num_maps <= ARRAY_SIZE(map_fds)); i++) { |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 364 | struct bpf_elf_map *map = &maps[i]; |
| 365 | |
| 366 | ret = bpf_map_attach(map->type, map->size_key, |
| 367 | map->size_value, map->max_elem); |
| 368 | if (ret < 0) |
| 369 | goto err_unwind; |
| 370 | |
| 371 | map_fds[i] = ret; |
| 372 | } |
| 373 | |
| 374 | return 0; |
| 375 | |
| 376 | err_unwind: |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 377 | bpf_maps_destroy(); |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 378 | return ret; |
| 379 | } |
| 380 | |
| 381 | static int bpf_fill_section_data(Elf *elf_fd, GElf_Ehdr *elf_hdr, int sec_index, |
| 382 | struct bpf_elf_sec_data *sec_data) |
| 383 | { |
| 384 | GElf_Shdr sec_hdr; |
| 385 | Elf_Scn *sec_fd; |
| 386 | Elf_Data *sec_edata; |
| 387 | char *sec_name; |
| 388 | |
| 389 | memset(sec_data, 0, sizeof(*sec_data)); |
| 390 | |
| 391 | sec_fd = elf_getscn(elf_fd, sec_index); |
| 392 | if (!sec_fd) |
| 393 | return -EINVAL; |
| 394 | |
| 395 | if (gelf_getshdr(sec_fd, &sec_hdr) != &sec_hdr) |
| 396 | return -EIO; |
| 397 | |
| 398 | sec_name = elf_strptr(elf_fd, elf_hdr->e_shstrndx, |
| 399 | sec_hdr.sh_name); |
| 400 | if (!sec_name || !sec_hdr.sh_size) |
| 401 | return -ENOENT; |
| 402 | |
| 403 | sec_edata = elf_getdata(sec_fd, NULL); |
| 404 | if (!sec_edata || elf_getdata(sec_fd, sec_edata)) |
| 405 | return -EIO; |
| 406 | |
| 407 | memcpy(&sec_data->sec_hdr, &sec_hdr, sizeof(sec_hdr)); |
| 408 | sec_data->sec_name = sec_name; |
| 409 | sec_data->sec_data = sec_edata; |
| 410 | |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | static int bpf_apply_relo_data(struct bpf_elf_sec_data *data_relo, |
| 415 | struct bpf_elf_sec_data *data_insn, |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 416 | Elf_Data *sym_tab) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 417 | { |
| 418 | Elf_Data *idata = data_insn->sec_data; |
| 419 | GElf_Shdr *rhdr = &data_relo->sec_hdr; |
| 420 | int relo_ent, relo_num = rhdr->sh_size / rhdr->sh_entsize; |
| 421 | struct bpf_insn *insns = idata->d_buf; |
| 422 | unsigned int num_insns = idata->d_size / sizeof(*insns); |
| 423 | |
| 424 | for (relo_ent = 0; relo_ent < relo_num; relo_ent++) { |
| 425 | unsigned int ioff, fnum; |
| 426 | GElf_Rel relo; |
| 427 | GElf_Sym sym; |
| 428 | |
| 429 | if (gelf_getrel(data_relo->sec_data, relo_ent, &relo) != &relo) |
| 430 | return -EIO; |
| 431 | |
| 432 | ioff = relo.r_offset / sizeof(struct bpf_insn); |
| 433 | if (ioff >= num_insns) |
| 434 | return -EINVAL; |
| 435 | if (insns[ioff].code != (BPF_LD | BPF_IMM | BPF_DW)) |
| 436 | return -EINVAL; |
| 437 | |
| 438 | if (gelf_getsym(sym_tab, GELF_R_SYM(relo.r_info), &sym) != &sym) |
| 439 | return -EIO; |
| 440 | |
| 441 | fnum = sym.st_value / sizeof(struct bpf_elf_map); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 442 | if (fnum >= ARRAY_SIZE(map_fds)) |
| 443 | return -EINVAL; |
| 444 | if (map_fds[fnum] < 0) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 445 | return -EINVAL; |
| 446 | |
| 447 | insns[ioff].src_reg = BPF_PSEUDO_MAP_FD; |
| 448 | insns[ioff].imm = map_fds[fnum]; |
| 449 | } |
| 450 | |
| 451 | return 0; |
| 452 | } |
| 453 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 454 | static int bpf_fetch_ancillary(int file_fd, Elf *elf_fd, GElf_Ehdr *elf_hdr, |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 455 | bool *sec_done, char *license, unsigned int lic_len, |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 456 | Elf_Data **sym_tab) |
| 457 | { |
| 458 | int sec_index, ret = -1; |
| 459 | |
| 460 | for (sec_index = 1; sec_index < elf_hdr->e_shnum; sec_index++) { |
| 461 | struct bpf_elf_sec_data data_anc; |
| 462 | |
| 463 | ret = bpf_fill_section_data(elf_fd, elf_hdr, sec_index, |
| 464 | &data_anc); |
| 465 | if (ret < 0) |
| 466 | continue; |
| 467 | |
| 468 | /* Extract and load eBPF map fds. */ |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 469 | if (!strcmp(data_anc.sec_name, ELF_SECTION_MAPS) && |
| 470 | !bpf_may_skip_map_creation(file_fd)) { |
| 471 | struct bpf_elf_map *maps; |
| 472 | unsigned int maps_num; |
| 473 | |
| 474 | if (data_anc.sec_data->d_size % sizeof(*maps) != 0) |
| 475 | return -EINVAL; |
| 476 | |
| 477 | maps = data_anc.sec_data->d_buf; |
| 478 | maps_num = data_anc.sec_data->d_size / sizeof(*maps); |
| 479 | memcpy(map_ent, maps, data_anc.sec_data->d_size); |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 480 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 481 | ret = bpf_maps_attach(maps, maps_num); |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 482 | if (ret < 0) |
| 483 | return ret; |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 484 | |
| 485 | sec_done[sec_index] = true; |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 486 | } |
| 487 | /* Extract eBPF license. */ |
| 488 | else if (!strcmp(data_anc.sec_name, ELF_SECTION_LICENSE)) { |
| 489 | if (data_anc.sec_data->d_size > lic_len) |
| 490 | return -ENOMEM; |
| 491 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 492 | sec_done[sec_index] = true; |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 493 | memcpy(license, data_anc.sec_data->d_buf, |
| 494 | data_anc.sec_data->d_size); |
| 495 | } |
| 496 | /* Extract symbol table for relocations (map fd fixups). */ |
| 497 | else if (data_anc.sec_hdr.sh_type == SHT_SYMTAB) { |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 498 | sec_done[sec_index] = true; |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 499 | *sym_tab = data_anc.sec_data; |
| 500 | } |
| 501 | } |
| 502 | |
| 503 | return ret; |
| 504 | } |
| 505 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 506 | static int bpf_fetch_prog_relo(Elf *elf_fd, GElf_Ehdr *elf_hdr, bool *sec_done, |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 507 | enum bpf_prog_type type, const char *sec, |
| 508 | const char *license, Elf_Data *sym_tab) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 509 | { |
| 510 | int sec_index, prog_fd = -1; |
| 511 | |
| 512 | for (sec_index = 1; sec_index < elf_hdr->e_shnum; sec_index++) { |
| 513 | struct bpf_elf_sec_data data_relo, data_insn; |
| 514 | int ins_index, ret; |
| 515 | |
| 516 | /* Attach eBPF programs with relocation data (maps). */ |
| 517 | ret = bpf_fill_section_data(elf_fd, elf_hdr, sec_index, |
| 518 | &data_relo); |
| 519 | if (ret < 0 || data_relo.sec_hdr.sh_type != SHT_REL) |
| 520 | continue; |
| 521 | |
| 522 | ins_index = data_relo.sec_hdr.sh_info; |
| 523 | |
| 524 | ret = bpf_fill_section_data(elf_fd, elf_hdr, ins_index, |
| 525 | &data_insn); |
| 526 | if (ret < 0) |
| 527 | continue; |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 528 | if (strcmp(data_insn.sec_name, sec)) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 529 | continue; |
| 530 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 531 | ret = bpf_apply_relo_data(&data_relo, &data_insn, sym_tab); |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 532 | if (ret < 0) |
| 533 | continue; |
| 534 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 535 | prog_fd = bpf_prog_attach(type, sec, data_insn.sec_data->d_buf, |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 536 | data_insn.sec_data->d_size, license); |
| 537 | if (prog_fd < 0) |
| 538 | continue; |
| 539 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 540 | sec_done[sec_index] = true; |
| 541 | sec_done[ins_index] = true; |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 542 | break; |
| 543 | } |
| 544 | |
| 545 | return prog_fd; |
| 546 | } |
| 547 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 548 | static int bpf_fetch_prog(Elf *elf_fd, GElf_Ehdr *elf_hdr, bool *sec_done, |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 549 | enum bpf_prog_type type, const char *sec, |
| 550 | const char *license) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 551 | { |
| 552 | int sec_index, prog_fd = -1; |
| 553 | |
| 554 | for (sec_index = 1; sec_index < elf_hdr->e_shnum; sec_index++) { |
| 555 | struct bpf_elf_sec_data data_insn; |
| 556 | int ret; |
| 557 | |
| 558 | /* Attach eBPF programs without relocation data. */ |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 559 | if (sec_done[sec_index]) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 560 | continue; |
| 561 | |
| 562 | ret = bpf_fill_section_data(elf_fd, elf_hdr, sec_index, |
| 563 | &data_insn); |
| 564 | if (ret < 0) |
| 565 | continue; |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 566 | if (strcmp(data_insn.sec_name, sec)) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 567 | continue; |
| 568 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 569 | prog_fd = bpf_prog_attach(type, sec, data_insn.sec_data->d_buf, |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 570 | data_insn.sec_data->d_size, license); |
| 571 | if (prog_fd < 0) |
| 572 | continue; |
| 573 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 574 | sec_done[sec_index] = true; |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 575 | break; |
| 576 | } |
| 577 | |
| 578 | return prog_fd; |
| 579 | } |
| 580 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 581 | static int bpf_fetch_prog_sec(Elf *elf_fd, GElf_Ehdr *elf_hdr, bool *sec_done, |
| 582 | enum bpf_prog_type type, const char *sec, |
| 583 | const char *license, Elf_Data *sym_tab) |
| 584 | { |
| 585 | int ret = -1; |
| 586 | |
| 587 | if (sym_tab) |
| 588 | ret = bpf_fetch_prog_relo(elf_fd, elf_hdr, sec_done, type, |
| 589 | sec, license, sym_tab); |
| 590 | if (ret < 0) |
| 591 | ret = bpf_fetch_prog(elf_fd, elf_hdr, sec_done, type, sec, |
| 592 | license); |
| 593 | return ret; |
| 594 | } |
| 595 | |
| 596 | static int bpf_fill_prog_arrays(Elf *elf_fd, GElf_Ehdr *elf_hdr, bool *sec_done, |
| 597 | enum bpf_prog_type type, const char *license, |
| 598 | Elf_Data *sym_tab) |
| 599 | { |
| 600 | int sec_index; |
| 601 | |
| 602 | for (sec_index = 1; sec_index < elf_hdr->e_shnum; sec_index++) { |
| 603 | struct bpf_elf_sec_data data_insn; |
| 604 | int ret, map_id, key_id, prog_fd; |
| 605 | |
| 606 | if (sec_done[sec_index]) |
| 607 | continue; |
| 608 | |
| 609 | ret = bpf_fill_section_data(elf_fd, elf_hdr, sec_index, |
| 610 | &data_insn); |
| 611 | if (ret < 0) |
| 612 | continue; |
| 613 | |
| 614 | ret = sscanf(data_insn.sec_name, "%i/%i", &map_id, &key_id); |
| 615 | if (ret != 2) |
| 616 | continue; |
| 617 | |
| 618 | if (map_id >= ARRAY_SIZE(map_fds) || map_fds[map_id] < 0) |
| 619 | return -ENOENT; |
| 620 | if (map_ent[map_id].type != BPF_MAP_TYPE_PROG_ARRAY || |
| 621 | map_ent[map_id].max_elem <= key_id) |
| 622 | return -EINVAL; |
| 623 | |
| 624 | prog_fd = bpf_fetch_prog_sec(elf_fd, elf_hdr, sec_done, |
| 625 | type, data_insn.sec_name, |
| 626 | license, sym_tab); |
| 627 | if (prog_fd < 0) |
| 628 | return -EIO; |
| 629 | |
| 630 | ret = bpf_update_map(map_fds[map_id], &key_id, &prog_fd, |
| 631 | BPF_ANY); |
| 632 | if (ret < 0) |
| 633 | return -ENOENT; |
| 634 | |
| 635 | sec_done[sec_index] = true; |
| 636 | } |
| 637 | |
| 638 | return 0; |
| 639 | } |
| 640 | |
Daniel Borkmann | d937a74 | 2015-04-28 13:37:42 +0200 | [diff] [blame] | 641 | int bpf_open_object(const char *path, enum bpf_prog_type type, |
| 642 | const char *sec, bool verbose) |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 643 | { |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 644 | char license[ELF_MAX_LICENSE_LEN]; |
| 645 | int file_fd, prog_fd = -1, ret; |
| 646 | Elf_Data *sym_tab = NULL; |
| 647 | GElf_Ehdr elf_hdr; |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 648 | bool *sec_done; |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 649 | Elf *elf_fd; |
| 650 | |
| 651 | if (elf_version(EV_CURRENT) == EV_NONE) |
| 652 | return -EINVAL; |
| 653 | |
| 654 | file_fd = open(path, O_RDONLY, 0); |
| 655 | if (file_fd < 0) |
| 656 | return -errno; |
| 657 | |
| 658 | elf_fd = elf_begin(file_fd, ELF_C_READ, NULL); |
| 659 | if (!elf_fd) { |
| 660 | ret = -EINVAL; |
| 661 | goto out; |
| 662 | } |
| 663 | |
| 664 | if (gelf_getehdr(elf_fd, &elf_hdr) != &elf_hdr) { |
| 665 | ret = -EIO; |
| 666 | goto out_elf; |
| 667 | } |
| 668 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 669 | sec_done = calloc(elf_hdr.e_shnum, sizeof(*sec_done)); |
| 670 | if (!sec_done) { |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 671 | ret = -ENOMEM; |
| 672 | goto out_elf; |
| 673 | } |
| 674 | |
| 675 | memset(license, 0, sizeof(license)); |
Daniel Borkmann | d937a74 | 2015-04-28 13:37:42 +0200 | [diff] [blame] | 676 | bpf_verbose = verbose; |
| 677 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 678 | if (!bpf_may_skip_map_creation(file_fd)) |
| 679 | bpf_maps_init(); |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 680 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 681 | ret = bpf_fetch_ancillary(file_fd, elf_fd, &elf_hdr, sec_done, |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 682 | license, sizeof(license), &sym_tab); |
| 683 | if (ret < 0) |
| 684 | goto out_maps; |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 685 | |
| 686 | prog_fd = bpf_fetch_prog_sec(elf_fd, &elf_hdr, sec_done, type, |
| 687 | sec, license, sym_tab); |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 688 | if (prog_fd < 0) |
| 689 | goto out_maps; |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 690 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 691 | if (!bpf_may_skip_map_creation(file_fd)) { |
| 692 | ret = bpf_fill_prog_arrays(elf_fd, &elf_hdr, sec_done, |
| 693 | type, license, sym_tab); |
| 694 | if (ret < 0) |
| 695 | goto out_prog; |
| 696 | } |
| 697 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 698 | bpf_save_finfo(file_fd); |
| 699 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 700 | free(sec_done); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 701 | |
| 702 | elf_end(elf_fd); |
| 703 | close(file_fd); |
| 704 | |
| 705 | return prog_fd; |
| 706 | |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 707 | out_prog: |
| 708 | close(prog_fd); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 709 | out_maps: |
| 710 | bpf_maps_destroy(); |
Daniel Borkmann | 473d784 | 2015-05-29 15:15:44 +0200 | [diff] [blame] | 711 | free(sec_done); |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 712 | out_elf: |
| 713 | elf_end(elf_fd); |
| 714 | out: |
| 715 | close(file_fd); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 716 | bpf_clear_finfo(); |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 717 | return prog_fd; |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 718 | } |
| 719 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 720 | static int |
Daniel Borkmann | 4bd6244 | 2015-04-16 21:20:06 +0200 | [diff] [blame] | 721 | bpf_map_set_send(int fd, struct sockaddr_un *addr, unsigned int addr_len, |
| 722 | const struct bpf_map_data *aux, unsigned int entries) |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 723 | { |
| 724 | struct bpf_map_set_msg msg; |
| 725 | int *cmsg_buf, min_fd; |
| 726 | char *amsg_buf; |
| 727 | int i; |
| 728 | |
| 729 | memset(&msg, 0, sizeof(msg)); |
| 730 | |
| 731 | msg.aux.uds_ver = BPF_SCM_AUX_VER; |
Daniel Borkmann | 4bd6244 | 2015-04-16 21:20:06 +0200 | [diff] [blame] | 732 | msg.aux.num_ent = entries; |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 733 | |
| 734 | strncpy(msg.aux.obj_name, aux->obj, sizeof(msg.aux.obj_name)); |
| 735 | memcpy(&msg.aux.obj_st, aux->st, sizeof(msg.aux.obj_st)); |
| 736 | |
| 737 | cmsg_buf = bpf_map_set_init(&msg, addr, addr_len); |
| 738 | amsg_buf = (char *)msg.aux.ent; |
| 739 | |
Daniel Borkmann | 4bd6244 | 2015-04-16 21:20:06 +0200 | [diff] [blame] | 740 | for (i = 0; i < entries; i += min_fd) { |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 741 | int ret; |
| 742 | |
Daniel Borkmann | 4bd6244 | 2015-04-16 21:20:06 +0200 | [diff] [blame] | 743 | min_fd = min(BPF_SCM_MAX_FDS * 1U, entries - i); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 744 | bpf_map_set_init_single(&msg, min_fd); |
| 745 | |
| 746 | memcpy(cmsg_buf, &aux->fds[i], sizeof(aux->fds[0]) * min_fd); |
| 747 | memcpy(amsg_buf, &aux->ent[i], sizeof(aux->ent[0]) * min_fd); |
| 748 | |
| 749 | ret = sendmsg(fd, &msg.hdr, 0); |
| 750 | if (ret <= 0) |
| 751 | return ret ? : -1; |
| 752 | } |
| 753 | |
| 754 | return 0; |
| 755 | } |
| 756 | |
Daniel Borkmann | 4bd6244 | 2015-04-16 21:20:06 +0200 | [diff] [blame] | 757 | static int |
| 758 | bpf_map_set_recv(int fd, int *fds, struct bpf_map_aux *aux, |
| 759 | unsigned int entries) |
| 760 | { |
| 761 | struct bpf_map_set_msg msg; |
| 762 | int *cmsg_buf, min_fd; |
| 763 | char *amsg_buf, *mmsg_buf; |
| 764 | unsigned int needed = 1; |
| 765 | int i; |
| 766 | |
| 767 | cmsg_buf = bpf_map_set_init(&msg, NULL, 0); |
| 768 | amsg_buf = (char *)msg.aux.ent; |
| 769 | mmsg_buf = (char *)&msg.aux; |
| 770 | |
| 771 | for (i = 0; i < min(entries, needed); i += min_fd) { |
| 772 | struct cmsghdr *cmsg; |
| 773 | int ret; |
| 774 | |
| 775 | min_fd = min(entries, entries - i); |
| 776 | bpf_map_set_init_single(&msg, min_fd); |
| 777 | |
| 778 | ret = recvmsg(fd, &msg.hdr, 0); |
| 779 | if (ret <= 0) |
| 780 | return ret ? : -1; |
| 781 | |
| 782 | cmsg = CMSG_FIRSTHDR(&msg.hdr); |
| 783 | if (!cmsg || cmsg->cmsg_type != SCM_RIGHTS) |
| 784 | return -EINVAL; |
| 785 | if (msg.hdr.msg_flags & MSG_CTRUNC) |
| 786 | return -EIO; |
| 787 | if (msg.aux.uds_ver != BPF_SCM_AUX_VER) |
| 788 | return -ENOSYS; |
| 789 | |
| 790 | min_fd = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof(fd); |
| 791 | if (min_fd > entries || min_fd <= 0) |
| 792 | return -EINVAL; |
| 793 | |
| 794 | memcpy(&fds[i], cmsg_buf, sizeof(fds[0]) * min_fd); |
| 795 | memcpy(&aux->ent[i], amsg_buf, sizeof(aux->ent[0]) * min_fd); |
| 796 | memcpy(aux, mmsg_buf, offsetof(struct bpf_map_aux, ent)); |
| 797 | |
| 798 | needed = aux->num_ent; |
| 799 | } |
| 800 | |
| 801 | return 0; |
| 802 | } |
| 803 | |
| 804 | int bpf_send_map_fds(const char *path, const char *obj) |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 805 | { |
| 806 | struct sockaddr_un addr; |
| 807 | struct bpf_map_data bpf_aux; |
| 808 | int fd, ret; |
| 809 | |
| 810 | fd = socket(AF_UNIX, SOCK_DGRAM, 0); |
| 811 | if (fd < 0) { |
| 812 | fprintf(stderr, "Cannot open socket: %s\n", |
| 813 | strerror(errno)); |
| 814 | return -1; |
| 815 | } |
| 816 | |
| 817 | memset(&addr, 0, sizeof(addr)); |
| 818 | addr.sun_family = AF_UNIX; |
| 819 | strncpy(addr.sun_path, path, sizeof(addr.sun_path)); |
| 820 | |
| 821 | ret = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); |
| 822 | if (ret < 0) { |
| 823 | fprintf(stderr, "Cannot connect to %s: %s\n", |
| 824 | path, strerror(errno)); |
| 825 | return -1; |
| 826 | } |
| 827 | |
| 828 | memset(&bpf_aux, 0, sizeof(bpf_aux)); |
| 829 | |
| 830 | bpf_aux.fds = map_fds; |
| 831 | bpf_aux.ent = map_ent; |
| 832 | |
| 833 | bpf_aux.obj = obj; |
| 834 | bpf_aux.st = &bpf_st; |
| 835 | |
Daniel Borkmann | 4bd6244 | 2015-04-16 21:20:06 +0200 | [diff] [blame] | 836 | ret = bpf_map_set_send(fd, &addr, sizeof(addr), &bpf_aux, |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 837 | bpf_maps_count()); |
| 838 | if (ret < 0) |
Daniel Borkmann | 4bd6244 | 2015-04-16 21:20:06 +0200 | [diff] [blame] | 839 | fprintf(stderr, "Cannot send fds to %s: %s\n", |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 840 | path, strerror(errno)); |
| 841 | |
| 842 | close(fd); |
| 843 | return ret; |
| 844 | } |
Daniel Borkmann | 4bd6244 | 2015-04-16 21:20:06 +0200 | [diff] [blame] | 845 | |
| 846 | int bpf_recv_map_fds(const char *path, int *fds, struct bpf_map_aux *aux, |
| 847 | unsigned int entries) |
| 848 | { |
| 849 | struct sockaddr_un addr; |
| 850 | int fd, ret; |
| 851 | |
| 852 | fd = socket(AF_UNIX, SOCK_DGRAM, 0); |
| 853 | if (fd < 0) { |
| 854 | fprintf(stderr, "Cannot open socket: %s\n", |
| 855 | strerror(errno)); |
| 856 | return -1; |
| 857 | } |
| 858 | |
| 859 | memset(&addr, 0, sizeof(addr)); |
| 860 | addr.sun_family = AF_UNIX; |
| 861 | strncpy(addr.sun_path, path, sizeof(addr.sun_path)); |
| 862 | |
| 863 | ret = bind(fd, (struct sockaddr *)&addr, sizeof(addr)); |
| 864 | if (ret < 0) { |
| 865 | fprintf(stderr, "Cannot bind to socket: %s\n", |
| 866 | strerror(errno)); |
| 867 | return -1; |
| 868 | } |
| 869 | |
| 870 | ret = bpf_map_set_recv(fd, fds, aux, entries); |
| 871 | if (ret < 0) |
| 872 | fprintf(stderr, "Cannot recv fds from %s: %s\n", |
| 873 | path, strerror(errno)); |
| 874 | |
| 875 | unlink(addr.sun_path); |
| 876 | close(fd); |
| 877 | return ret; |
| 878 | } |
Daniel Borkmann | 11c39b5 | 2015-03-16 19:37:41 +0100 | [diff] [blame] | 879 | #endif /* HAVE_ELF */ |