1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */ 3 4 #include <ctype.h> 5 #include <errno.h> 6 #include <fcntl.h> 7 #include <fts.h> 8 #include <libgen.h> 9 #include <mntent.h> 10 #include <stdbool.h> 11 #include <stdio.h> 12 #include <stdlib.h> 13 #include <string.h> 14 #include <unistd.h> 15 #include <linux/limits.h> 16 #include <linux/magic.h> 17 #include <net/if.h> 18 #include <sys/mount.h> 19 #include <sys/resource.h> 20 #include <sys/stat.h> 21 #include <sys/vfs.h> 22 23 #include <bpf.h> 24 #include <libbpf.h> /* libbpf_num_possible_cpus */ 25 26 #include "main.h" 27 28 #ifndef BPF_FS_MAGIC 29 #define BPF_FS_MAGIC 0xcafe4a11 30 #endif 31 32 void p_err(const char *fmt, ...) 33 { 34 va_list ap; 35 36 va_start(ap, fmt); 37 if (json_output) { 38 jsonw_start_object(json_wtr); 39 jsonw_name(json_wtr, "error"); 40 jsonw_vprintf_enquote(json_wtr, fmt, ap); 41 jsonw_end_object(json_wtr); 42 } else { 43 fprintf(stderr, "Error: "); 44 vfprintf(stderr, fmt, ap); 45 fprintf(stderr, "\n"); 46 } 47 va_end(ap); 48 } 49 50 void p_info(const char *fmt, ...) 51 { 52 va_list ap; 53 54 if (json_output) 55 return; 56 57 va_start(ap, fmt); 58 vfprintf(stderr, fmt, ap); 59 fprintf(stderr, "\n"); 60 va_end(ap); 61 } 62 63 static bool is_bpffs(char *path) 64 { 65 struct statfs st_fs; 66 67 if (statfs(path, &st_fs) < 0) 68 return false; 69 70 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC; 71 } 72 73 void set_max_rlimit(void) 74 { 75 struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY }; 76 77 setrlimit(RLIMIT_MEMLOCK, &rinf); 78 } 79 80 static int 81 mnt_fs(const char *target, const char *type, char *buff, size_t bufflen) 82 { 83 bool bind_done = false; 84 85 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) { 86 if (errno != EINVAL || bind_done) { 87 snprintf(buff, bufflen, 88 "mount --make-private %s failed: %s", 89 target, strerror(errno)); 90 return -1; 91 } 92 93 if (mount(target, target, "none", MS_BIND, NULL)) { 94 snprintf(buff, bufflen, 95 "mount --bind %s %s failed: %s", 96 target, target, strerror(errno)); 97 return -1; 98 } 99 100 bind_done = true; 101 } 102 103 if (mount(type, target, type, 0, "mode=0700")) { 104 snprintf(buff, bufflen, "mount -t %s %s %s failed: %s", 105 type, type, target, strerror(errno)); 106 return -1; 107 } 108 109 return 0; 110 } 111 112 int mount_tracefs(const char *target) 113 { 114 char err_str[ERR_MAX_LEN]; 115 int err; 116 117 err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN); 118 if (err) { 119 err_str[ERR_MAX_LEN - 1] = '\0'; 120 p_err("can't mount tracefs: %s", err_str); 121 } 122 123 return err; 124 } 125 126 int open_obj_pinned(char *path, bool quiet) 127 { 128 int fd; 129 130 fd = bpf_obj_get(path); 131 if (fd < 0) { 132 if (!quiet) 133 p_err("bpf obj get (%s): %s", path, 134 errno == EACCES && !is_bpffs(dirname(path)) ? 135 "directory not in bpf file system (bpffs)" : 136 strerror(errno)); 137 return -1; 138 } 139 140 return fd; 141 } 142 143 int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type) 144 { 145 enum bpf_obj_type type; 146 int fd; 147 148 fd = open_obj_pinned(path, false); 149 if (fd < 0) 150 return -1; 151 152 type = get_fd_type(fd); 153 if (type < 0) { 154 close(fd); 155 return type; 156 } 157 if (type != exp_type) { 158 p_err("incorrect object type: %s", get_fd_type_name(type)); 159 close(fd); 160 return -1; 161 } 162 163 return fd; 164 } 165 166 int mount_bpffs_for_pin(const char *name) 167 { 168 char err_str[ERR_MAX_LEN]; 169 char *file; 170 char *dir; 171 int err = 0; 172 173 file = malloc(strlen(name) + 1); 174 strcpy(file, name); 175 dir = dirname(file); 176 177 if (is_bpffs(dir)) 178 /* nothing to do if already mounted */ 179 goto out_free; 180 181 if (block_mount) { 182 p_err("no BPF file system found, not mounting it due to --nomount option"); 183 err = -1; 184 goto out_free; 185 } 186 187 err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN); 188 if (err) { 189 err_str[ERR_MAX_LEN - 1] = '\0'; 190 p_err("can't mount BPF file system to pin the object (%s): %s", 191 name, err_str); 192 } 193 194 out_free: 195 free(file); 196 return err; 197 } 198 199 int do_pin_fd(int fd, const char *name) 200 { 201 int err; 202 203 err = mount_bpffs_for_pin(name); 204 if (err) 205 return err; 206 207 err = bpf_obj_pin(fd, name); 208 if (err) 209 p_err("can't pin the object (%s): %s", name, strerror(errno)); 210 211 return err; 212 } 213 214 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32)) 215 { 216 unsigned int id; 217 char *endptr; 218 int err; 219 int fd; 220 221 if (argc < 3) { 222 p_err("too few arguments, id ID and FILE path is required"); 223 return -1; 224 } else if (argc > 3) { 225 p_err("too many arguments"); 226 return -1; 227 } 228 229 if (!is_prefix(*argv, "id")) { 230 p_err("expected 'id' got %s", *argv); 231 return -1; 232 } 233 NEXT_ARG(); 234 235 id = strtoul(*argv, &endptr, 0); 236 if (*endptr) { 237 p_err("can't parse %s as ID", *argv); 238 return -1; 239 } 240 NEXT_ARG(); 241 242 fd = get_fd_by_id(id); 243 if (fd < 0) { 244 p_err("can't open object by id (%u): %s", id, strerror(errno)); 245 return -1; 246 } 247 248 err = do_pin_fd(fd, *argv); 249 250 close(fd); 251 return err; 252 } 253 254 const char *get_fd_type_name(enum bpf_obj_type type) 255 { 256 static const char * const names[] = { 257 [BPF_OBJ_UNKNOWN] = "unknown", 258 [BPF_OBJ_PROG] = "prog", 259 [BPF_OBJ_MAP] = "map", 260 }; 261 262 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) 263 return names[BPF_OBJ_UNKNOWN]; 264 265 return names[type]; 266 } 267 268 int get_fd_type(int fd) 269 { 270 char path[PATH_MAX]; 271 char buf[512]; 272 ssize_t n; 273 274 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); 275 276 n = readlink(path, buf, sizeof(buf)); 277 if (n < 0) { 278 p_err("can't read link type: %s", strerror(errno)); 279 return -1; 280 } 281 if (n == sizeof(path)) { 282 p_err("can't read link type: path too long!"); 283 return -1; 284 } 285 286 if (strstr(buf, "bpf-map")) 287 return BPF_OBJ_MAP; 288 else if (strstr(buf, "bpf-prog")) 289 return BPF_OBJ_PROG; 290 291 return BPF_OBJ_UNKNOWN; 292 } 293 294 char *get_fdinfo(int fd, const char *key) 295 { 296 char path[PATH_MAX]; 297 char *line = NULL; 298 size_t line_n = 0; 299 ssize_t n; 300 FILE *fdi; 301 302 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); 303 304 fdi = fopen(path, "r"); 305 if (!fdi) 306 return NULL; 307 308 while ((n = getline(&line, &line_n, fdi)) > 0) { 309 char *value; 310 int len; 311 312 if (!strstr(line, key)) 313 continue; 314 315 fclose(fdi); 316 317 value = strchr(line, '\t'); 318 if (!value || !value[1]) { 319 free(line); 320 return NULL; 321 } 322 value++; 323 324 len = strlen(value); 325 memmove(line, value, len); 326 line[len - 1] = '\0'; 327 328 return line; 329 } 330 331 free(line); 332 fclose(fdi); 333 return NULL; 334 } 335 336 void print_data_json(uint8_t *data, size_t len) 337 { 338 unsigned int i; 339 340 jsonw_start_array(json_wtr); 341 for (i = 0; i < len; i++) 342 jsonw_printf(json_wtr, "%d", data[i]); 343 jsonw_end_array(json_wtr); 344 } 345 346 void print_hex_data_json(uint8_t *data, size_t len) 347 { 348 unsigned int i; 349 350 jsonw_start_array(json_wtr); 351 for (i = 0; i < len; i++) 352 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); 353 jsonw_end_array(json_wtr); 354 } 355 356 int build_pinned_obj_table(struct pinned_obj_table *tab, 357 enum bpf_obj_type type) 358 { 359 struct bpf_prog_info pinned_info = {}; 360 struct pinned_obj *obj_node = NULL; 361 __u32 len = sizeof(pinned_info); 362 struct mntent *mntent = NULL; 363 enum bpf_obj_type objtype; 364 FILE *mntfile = NULL; 365 FTSENT *ftse = NULL; 366 FTS *fts = NULL; 367 int fd, err; 368 369 mntfile = setmntent("/proc/mounts", "r"); 370 if (!mntfile) 371 return -1; 372 373 while ((mntent = getmntent(mntfile))) { 374 char *path[] = { mntent->mnt_dir, NULL }; 375 376 if (strncmp(mntent->mnt_type, "bpf", 3) != 0) 377 continue; 378 379 fts = fts_open(path, 0, NULL); 380 if (!fts) 381 continue; 382 383 while ((ftse = fts_read(fts))) { 384 if (!(ftse->fts_info & FTS_F)) 385 continue; 386 fd = open_obj_pinned(ftse->fts_path, true); 387 if (fd < 0) 388 continue; 389 390 objtype = get_fd_type(fd); 391 if (objtype != type) { 392 close(fd); 393 continue; 394 } 395 memset(&pinned_info, 0, sizeof(pinned_info)); 396 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len); 397 if (err) { 398 close(fd); 399 continue; 400 } 401 402 obj_node = malloc(sizeof(*obj_node)); 403 if (!obj_node) { 404 close(fd); 405 fts_close(fts); 406 fclose(mntfile); 407 return -1; 408 } 409 410 memset(obj_node, 0, sizeof(*obj_node)); 411 obj_node->id = pinned_info.id; 412 obj_node->path = strdup(ftse->fts_path); 413 hash_add(tab->table, &obj_node->hash, obj_node->id); 414 415 close(fd); 416 } 417 fts_close(fts); 418 } 419 fclose(mntfile); 420 return 0; 421 } 422 423 void delete_pinned_obj_table(struct pinned_obj_table *tab) 424 { 425 struct pinned_obj *obj; 426 struct hlist_node *tmp; 427 unsigned int bkt; 428 429 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) { 430 hash_del(&obj->hash); 431 free(obj->path); 432 free(obj); 433 } 434 } 435 436 unsigned int get_page_size(void) 437 { 438 static int result; 439 440 if (!result) 441 result = getpagesize(); 442 return result; 443 } 444 445 unsigned int get_possible_cpus(void) 446 { 447 int cpus = libbpf_num_possible_cpus(); 448 449 if (cpus < 0) { 450 p_err("Can't get # of possible cpus: %s", strerror(-cpus)); 451 exit(-1); 452 } 453 return cpus; 454 } 455 456 static char * 457 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) 458 { 459 struct stat st; 460 int err; 461 462 err = stat("/proc/self/ns/net", &st); 463 if (err) { 464 p_err("Can't stat /proc/self: %s", strerror(errno)); 465 return NULL; 466 } 467 468 if (st.st_dev != ns_dev || st.st_ino != ns_ino) 469 return NULL; 470 471 return if_indextoname(ifindex, buf); 472 } 473 474 static int read_sysfs_hex_int(char *path) 475 { 476 char vendor_id_buf[8]; 477 int len; 478 int fd; 479 480 fd = open(path, O_RDONLY); 481 if (fd < 0) { 482 p_err("Can't open %s: %s", path, strerror(errno)); 483 return -1; 484 } 485 486 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); 487 close(fd); 488 if (len < 0) { 489 p_err("Can't read %s: %s", path, strerror(errno)); 490 return -1; 491 } 492 if (len >= (int)sizeof(vendor_id_buf)) { 493 p_err("Value in %s too long", path); 494 return -1; 495 } 496 497 vendor_id_buf[len] = 0; 498 499 return strtol(vendor_id_buf, NULL, 0); 500 } 501 502 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) 503 { 504 char full_path[64]; 505 506 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", 507 devname, entry_name); 508 509 return read_sysfs_hex_int(full_path); 510 } 511 512 const char * 513 ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, 514 const char **opt) 515 { 516 char devname[IF_NAMESIZE]; 517 int vendor_id; 518 int device_id; 519 520 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { 521 p_err("Can't get net device name for ifindex %d: %s", ifindex, 522 strerror(errno)); 523 return NULL; 524 } 525 526 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); 527 if (vendor_id < 0) { 528 p_err("Can't get device vendor id for %s", devname); 529 return NULL; 530 } 531 532 switch (vendor_id) { 533 case 0x19ee: 534 device_id = read_sysfs_netdev_hex_int(devname, "device"); 535 if (device_id != 0x4000 && 536 device_id != 0x6000 && 537 device_id != 0x6003) 538 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); 539 *opt = "ctx4"; 540 return "NFP-6xxx"; 541 default: 542 p_err("Can't get bfd arch name for device vendor id 0x%04x", 543 vendor_id); 544 return NULL; 545 } 546 } 547 548 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 549 { 550 char name[IF_NAMESIZE]; 551 552 if (!ifindex) 553 return; 554 555 printf(" offloaded_to "); 556 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 557 printf("%s", name); 558 else 559 printf("ifindex %u ns_dev %llu ns_ino %llu", 560 ifindex, ns_dev, ns_inode); 561 } 562 563 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 564 { 565 char name[IF_NAMESIZE]; 566 567 if (!ifindex) 568 return; 569 570 jsonw_name(json_wtr, "dev"); 571 jsonw_start_object(json_wtr); 572 jsonw_uint_field(json_wtr, "ifindex", ifindex); 573 jsonw_uint_field(json_wtr, "ns_dev", ns_dev); 574 jsonw_uint_field(json_wtr, "ns_inode", ns_inode); 575 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 576 jsonw_string_field(json_wtr, "ifname", name); 577 jsonw_end_object(json_wtr); 578 } 579 580 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what) 581 { 582 char *endptr; 583 584 NEXT_ARGP(); 585 586 if (*val) { 587 p_err("%s already specified", what); 588 return -1; 589 } 590 591 *val = strtoul(**argv, &endptr, 0); 592 if (*endptr) { 593 p_err("can't parse %s as %s", **argv, what); 594 return -1; 595 } 596 NEXT_ARGP(); 597 598 return 0; 599 } 600