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 __printf(1, 2) 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 __printf(1, 2) 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 return bpf_obj_pin(fd, name); 208 } 209 210 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32)) 211 { 212 unsigned int id; 213 char *endptr; 214 int err; 215 int fd; 216 217 if (argc < 3) { 218 p_err("too few arguments, id ID and FILE path is required"); 219 return -1; 220 } else if (argc > 3) { 221 p_err("too many arguments"); 222 return -1; 223 } 224 225 if (!is_prefix(*argv, "id")) { 226 p_err("expected 'id' got %s", *argv); 227 return -1; 228 } 229 NEXT_ARG(); 230 231 id = strtoul(*argv, &endptr, 0); 232 if (*endptr) { 233 p_err("can't parse %s as ID", *argv); 234 return -1; 235 } 236 NEXT_ARG(); 237 238 fd = get_fd_by_id(id); 239 if (fd < 0) { 240 p_err("can't get prog by id (%u): %s", id, strerror(errno)); 241 return -1; 242 } 243 244 err = do_pin_fd(fd, *argv); 245 246 close(fd); 247 return err; 248 } 249 250 const char *get_fd_type_name(enum bpf_obj_type type) 251 { 252 static const char * const names[] = { 253 [BPF_OBJ_UNKNOWN] = "unknown", 254 [BPF_OBJ_PROG] = "prog", 255 [BPF_OBJ_MAP] = "map", 256 }; 257 258 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) 259 return names[BPF_OBJ_UNKNOWN]; 260 261 return names[type]; 262 } 263 264 int get_fd_type(int fd) 265 { 266 char path[PATH_MAX]; 267 char buf[512]; 268 ssize_t n; 269 270 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); 271 272 n = readlink(path, buf, sizeof(buf)); 273 if (n < 0) { 274 p_err("can't read link type: %s", strerror(errno)); 275 return -1; 276 } 277 if (n == sizeof(path)) { 278 p_err("can't read link type: path too long!"); 279 return -1; 280 } 281 282 if (strstr(buf, "bpf-map")) 283 return BPF_OBJ_MAP; 284 else if (strstr(buf, "bpf-prog")) 285 return BPF_OBJ_PROG; 286 287 return BPF_OBJ_UNKNOWN; 288 } 289 290 char *get_fdinfo(int fd, const char *key) 291 { 292 char path[PATH_MAX]; 293 char *line = NULL; 294 size_t line_n = 0; 295 ssize_t n; 296 FILE *fdi; 297 298 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); 299 300 fdi = fopen(path, "r"); 301 if (!fdi) 302 return NULL; 303 304 while ((n = getline(&line, &line_n, fdi)) > 0) { 305 char *value; 306 int len; 307 308 if (!strstr(line, key)) 309 continue; 310 311 fclose(fdi); 312 313 value = strchr(line, '\t'); 314 if (!value || !value[1]) { 315 free(line); 316 return NULL; 317 } 318 value++; 319 320 len = strlen(value); 321 memmove(line, value, len); 322 line[len - 1] = '\0'; 323 324 return line; 325 } 326 327 free(line); 328 fclose(fdi); 329 return NULL; 330 } 331 332 void print_data_json(uint8_t *data, size_t len) 333 { 334 unsigned int i; 335 336 jsonw_start_array(json_wtr); 337 for (i = 0; i < len; i++) 338 jsonw_printf(json_wtr, "%d", data[i]); 339 jsonw_end_array(json_wtr); 340 } 341 342 void print_hex_data_json(uint8_t *data, size_t len) 343 { 344 unsigned int i; 345 346 jsonw_start_array(json_wtr); 347 for (i = 0; i < len; i++) 348 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); 349 jsonw_end_array(json_wtr); 350 } 351 352 int build_pinned_obj_table(struct pinned_obj_table *tab, 353 enum bpf_obj_type type) 354 { 355 struct bpf_prog_info pinned_info = {}; 356 struct pinned_obj *obj_node = NULL; 357 __u32 len = sizeof(pinned_info); 358 struct mntent *mntent = NULL; 359 enum bpf_obj_type objtype; 360 FILE *mntfile = NULL; 361 FTSENT *ftse = NULL; 362 FTS *fts = NULL; 363 int fd, err; 364 365 mntfile = setmntent("/proc/mounts", "r"); 366 if (!mntfile) 367 return -1; 368 369 while ((mntent = getmntent(mntfile))) { 370 char *path[] = { mntent->mnt_dir, NULL }; 371 372 if (strncmp(mntent->mnt_type, "bpf", 3) != 0) 373 continue; 374 375 fts = fts_open(path, 0, NULL); 376 if (!fts) 377 continue; 378 379 while ((ftse = fts_read(fts))) { 380 if (!(ftse->fts_info & FTS_F)) 381 continue; 382 fd = open_obj_pinned(ftse->fts_path, true); 383 if (fd < 0) 384 continue; 385 386 objtype = get_fd_type(fd); 387 if (objtype != type) { 388 close(fd); 389 continue; 390 } 391 memset(&pinned_info, 0, sizeof(pinned_info)); 392 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len); 393 if (err) { 394 close(fd); 395 continue; 396 } 397 398 obj_node = malloc(sizeof(*obj_node)); 399 if (!obj_node) { 400 close(fd); 401 fts_close(fts); 402 fclose(mntfile); 403 return -1; 404 } 405 406 memset(obj_node, 0, sizeof(*obj_node)); 407 obj_node->id = pinned_info.id; 408 obj_node->path = strdup(ftse->fts_path); 409 hash_add(tab->table, &obj_node->hash, obj_node->id); 410 411 close(fd); 412 } 413 fts_close(fts); 414 } 415 fclose(mntfile); 416 return 0; 417 } 418 419 void delete_pinned_obj_table(struct pinned_obj_table *tab) 420 { 421 struct pinned_obj *obj; 422 struct hlist_node *tmp; 423 unsigned int bkt; 424 425 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) { 426 hash_del(&obj->hash); 427 free(obj->path); 428 free(obj); 429 } 430 } 431 432 unsigned int get_page_size(void) 433 { 434 static int result; 435 436 if (!result) 437 result = getpagesize(); 438 return result; 439 } 440 441 unsigned int get_possible_cpus(void) 442 { 443 int cpus = libbpf_num_possible_cpus(); 444 445 if (cpus < 0) { 446 p_err("Can't get # of possible cpus: %s", strerror(-cpus)); 447 exit(-1); 448 } 449 return cpus; 450 } 451 452 static char * 453 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) 454 { 455 struct stat st; 456 int err; 457 458 err = stat("/proc/self/ns/net", &st); 459 if (err) { 460 p_err("Can't stat /proc/self: %s", strerror(errno)); 461 return NULL; 462 } 463 464 if (st.st_dev != ns_dev || st.st_ino != ns_ino) 465 return NULL; 466 467 return if_indextoname(ifindex, buf); 468 } 469 470 static int read_sysfs_hex_int(char *path) 471 { 472 char vendor_id_buf[8]; 473 int len; 474 int fd; 475 476 fd = open(path, O_RDONLY); 477 if (fd < 0) { 478 p_err("Can't open %s: %s", path, strerror(errno)); 479 return -1; 480 } 481 482 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); 483 close(fd); 484 if (len < 0) { 485 p_err("Can't read %s: %s", path, strerror(errno)); 486 return -1; 487 } 488 if (len >= (int)sizeof(vendor_id_buf)) { 489 p_err("Value in %s too long", path); 490 return -1; 491 } 492 493 vendor_id_buf[len] = 0; 494 495 return strtol(vendor_id_buf, NULL, 0); 496 } 497 498 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) 499 { 500 char full_path[64]; 501 502 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", 503 devname, entry_name); 504 505 return read_sysfs_hex_int(full_path); 506 } 507 508 const char * 509 ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, 510 const char **opt) 511 { 512 char devname[IF_NAMESIZE]; 513 int vendor_id; 514 int device_id; 515 516 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { 517 p_err("Can't get net device name for ifindex %d: %s", ifindex, 518 strerror(errno)); 519 return NULL; 520 } 521 522 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); 523 if (vendor_id < 0) { 524 p_err("Can't get device vendor id for %s", devname); 525 return NULL; 526 } 527 528 switch (vendor_id) { 529 case 0x19ee: 530 device_id = read_sysfs_netdev_hex_int(devname, "device"); 531 if (device_id != 0x4000 && 532 device_id != 0x6000 && 533 device_id != 0x6003) 534 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); 535 *opt = "ctx4"; 536 return "NFP-6xxx"; 537 default: 538 p_err("Can't get bfd arch name for device vendor id 0x%04x", 539 vendor_id); 540 return NULL; 541 } 542 } 543 544 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 545 { 546 char name[IF_NAMESIZE]; 547 548 if (!ifindex) 549 return; 550 551 printf(" offloaded_to "); 552 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 553 printf("%s", name); 554 else 555 printf("ifindex %u ns_dev %llu ns_ino %llu", 556 ifindex, ns_dev, ns_inode); 557 } 558 559 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 560 { 561 char name[IF_NAMESIZE]; 562 563 if (!ifindex) 564 return; 565 566 jsonw_name(json_wtr, "dev"); 567 jsonw_start_object(json_wtr); 568 jsonw_uint_field(json_wtr, "ifindex", ifindex); 569 jsonw_uint_field(json_wtr, "ns_dev", ns_dev); 570 jsonw_uint_field(json_wtr, "ns_inode", ns_inode); 571 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 572 jsonw_string_field(json_wtr, "ifname", name); 573 jsonw_end_object(json_wtr); 574 } 575 576 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what) 577 { 578 char *endptr; 579 580 NEXT_ARGP(); 581 582 if (*val) { 583 p_err("%s already specified", what); 584 return -1; 585 } 586 587 *val = strtoul(**argv, &endptr, 0); 588 if (*endptr) { 589 p_err("can't parse %s as %s", **argv, what); 590 return -1; 591 } 592 NEXT_ARGP(); 593 594 return 0; 595 } 596