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/bpf.h> 24 #include <bpf/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)(int *, char ***)) 215 { 216 int err; 217 int fd; 218 219 fd = get_fd(&argc, &argv); 220 if (fd < 0) 221 return fd; 222 223 err = do_pin_fd(fd, *argv); 224 225 close(fd); 226 return err; 227 } 228 229 const char *get_fd_type_name(enum bpf_obj_type type) 230 { 231 static const char * const names[] = { 232 [BPF_OBJ_UNKNOWN] = "unknown", 233 [BPF_OBJ_PROG] = "prog", 234 [BPF_OBJ_MAP] = "map", 235 }; 236 237 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) 238 return names[BPF_OBJ_UNKNOWN]; 239 240 return names[type]; 241 } 242 243 int get_fd_type(int fd) 244 { 245 char path[PATH_MAX]; 246 char buf[512]; 247 ssize_t n; 248 249 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); 250 251 n = readlink(path, buf, sizeof(buf)); 252 if (n < 0) { 253 p_err("can't read link type: %s", strerror(errno)); 254 return -1; 255 } 256 if (n == sizeof(path)) { 257 p_err("can't read link type: path too long!"); 258 return -1; 259 } 260 261 if (strstr(buf, "bpf-map")) 262 return BPF_OBJ_MAP; 263 else if (strstr(buf, "bpf-prog")) 264 return BPF_OBJ_PROG; 265 else if (strstr(buf, "bpf-link")) 266 return BPF_OBJ_LINK; 267 268 return BPF_OBJ_UNKNOWN; 269 } 270 271 char *get_fdinfo(int fd, const char *key) 272 { 273 char path[PATH_MAX]; 274 char *line = NULL; 275 size_t line_n = 0; 276 ssize_t n; 277 FILE *fdi; 278 279 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); 280 281 fdi = fopen(path, "r"); 282 if (!fdi) 283 return NULL; 284 285 while ((n = getline(&line, &line_n, fdi)) > 0) { 286 char *value; 287 int len; 288 289 if (!strstr(line, key)) 290 continue; 291 292 fclose(fdi); 293 294 value = strchr(line, '\t'); 295 if (!value || !value[1]) { 296 free(line); 297 return NULL; 298 } 299 value++; 300 301 len = strlen(value); 302 memmove(line, value, len); 303 line[len - 1] = '\0'; 304 305 return line; 306 } 307 308 free(line); 309 fclose(fdi); 310 return NULL; 311 } 312 313 void print_data_json(uint8_t *data, size_t len) 314 { 315 unsigned int i; 316 317 jsonw_start_array(json_wtr); 318 for (i = 0; i < len; i++) 319 jsonw_printf(json_wtr, "%d", data[i]); 320 jsonw_end_array(json_wtr); 321 } 322 323 void print_hex_data_json(uint8_t *data, size_t len) 324 { 325 unsigned int i; 326 327 jsonw_start_array(json_wtr); 328 for (i = 0; i < len; i++) 329 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); 330 jsonw_end_array(json_wtr); 331 } 332 333 int build_pinned_obj_table(struct pinned_obj_table *tab, 334 enum bpf_obj_type type) 335 { 336 struct bpf_prog_info pinned_info = {}; 337 struct pinned_obj *obj_node = NULL; 338 __u32 len = sizeof(pinned_info); 339 struct mntent *mntent = NULL; 340 enum bpf_obj_type objtype; 341 FILE *mntfile = NULL; 342 FTSENT *ftse = NULL; 343 FTS *fts = NULL; 344 int fd, err; 345 346 mntfile = setmntent("/proc/mounts", "r"); 347 if (!mntfile) 348 return -1; 349 350 while ((mntent = getmntent(mntfile))) { 351 char *path[] = { mntent->mnt_dir, NULL }; 352 353 if (strncmp(mntent->mnt_type, "bpf", 3) != 0) 354 continue; 355 356 fts = fts_open(path, 0, NULL); 357 if (!fts) 358 continue; 359 360 while ((ftse = fts_read(fts))) { 361 if (!(ftse->fts_info & FTS_F)) 362 continue; 363 fd = open_obj_pinned(ftse->fts_path, true); 364 if (fd < 0) 365 continue; 366 367 objtype = get_fd_type(fd); 368 if (objtype != type) { 369 close(fd); 370 continue; 371 } 372 memset(&pinned_info, 0, sizeof(pinned_info)); 373 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len); 374 if (err) { 375 close(fd); 376 continue; 377 } 378 379 obj_node = malloc(sizeof(*obj_node)); 380 if (!obj_node) { 381 close(fd); 382 fts_close(fts); 383 fclose(mntfile); 384 return -1; 385 } 386 387 memset(obj_node, 0, sizeof(*obj_node)); 388 obj_node->id = pinned_info.id; 389 obj_node->path = strdup(ftse->fts_path); 390 hash_add(tab->table, &obj_node->hash, obj_node->id); 391 392 close(fd); 393 } 394 fts_close(fts); 395 } 396 fclose(mntfile); 397 return 0; 398 } 399 400 void delete_pinned_obj_table(struct pinned_obj_table *tab) 401 { 402 struct pinned_obj *obj; 403 struct hlist_node *tmp; 404 unsigned int bkt; 405 406 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) { 407 hash_del(&obj->hash); 408 free(obj->path); 409 free(obj); 410 } 411 } 412 413 unsigned int get_page_size(void) 414 { 415 static int result; 416 417 if (!result) 418 result = getpagesize(); 419 return result; 420 } 421 422 unsigned int get_possible_cpus(void) 423 { 424 int cpus = libbpf_num_possible_cpus(); 425 426 if (cpus < 0) { 427 p_err("Can't get # of possible cpus: %s", strerror(-cpus)); 428 exit(-1); 429 } 430 return cpus; 431 } 432 433 static char * 434 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) 435 { 436 struct stat st; 437 int err; 438 439 err = stat("/proc/self/ns/net", &st); 440 if (err) { 441 p_err("Can't stat /proc/self: %s", strerror(errno)); 442 return NULL; 443 } 444 445 if (st.st_dev != ns_dev || st.st_ino != ns_ino) 446 return NULL; 447 448 return if_indextoname(ifindex, buf); 449 } 450 451 static int read_sysfs_hex_int(char *path) 452 { 453 char vendor_id_buf[8]; 454 int len; 455 int fd; 456 457 fd = open(path, O_RDONLY); 458 if (fd < 0) { 459 p_err("Can't open %s: %s", path, strerror(errno)); 460 return -1; 461 } 462 463 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); 464 close(fd); 465 if (len < 0) { 466 p_err("Can't read %s: %s", path, strerror(errno)); 467 return -1; 468 } 469 if (len >= (int)sizeof(vendor_id_buf)) { 470 p_err("Value in %s too long", path); 471 return -1; 472 } 473 474 vendor_id_buf[len] = 0; 475 476 return strtol(vendor_id_buf, NULL, 0); 477 } 478 479 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) 480 { 481 char full_path[64]; 482 483 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", 484 devname, entry_name); 485 486 return read_sysfs_hex_int(full_path); 487 } 488 489 const char * 490 ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, 491 const char **opt) 492 { 493 char devname[IF_NAMESIZE]; 494 int vendor_id; 495 int device_id; 496 497 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { 498 p_err("Can't get net device name for ifindex %d: %s", ifindex, 499 strerror(errno)); 500 return NULL; 501 } 502 503 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); 504 if (vendor_id < 0) { 505 p_err("Can't get device vendor id for %s", devname); 506 return NULL; 507 } 508 509 switch (vendor_id) { 510 case 0x19ee: 511 device_id = read_sysfs_netdev_hex_int(devname, "device"); 512 if (device_id != 0x4000 && 513 device_id != 0x6000 && 514 device_id != 0x6003) 515 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); 516 *opt = "ctx4"; 517 return "NFP-6xxx"; 518 default: 519 p_err("Can't get bfd arch name for device vendor id 0x%04x", 520 vendor_id); 521 return NULL; 522 } 523 } 524 525 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 526 { 527 char name[IF_NAMESIZE]; 528 529 if (!ifindex) 530 return; 531 532 printf(" offloaded_to "); 533 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 534 printf("%s", name); 535 else 536 printf("ifindex %u ns_dev %llu ns_ino %llu", 537 ifindex, ns_dev, ns_inode); 538 } 539 540 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 541 { 542 char name[IF_NAMESIZE]; 543 544 if (!ifindex) 545 return; 546 547 jsonw_name(json_wtr, "dev"); 548 jsonw_start_object(json_wtr); 549 jsonw_uint_field(json_wtr, "ifindex", ifindex); 550 jsonw_uint_field(json_wtr, "ns_dev", ns_dev); 551 jsonw_uint_field(json_wtr, "ns_inode", ns_inode); 552 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 553 jsonw_string_field(json_wtr, "ifname", name); 554 jsonw_end_object(json_wtr); 555 } 556 557 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what) 558 { 559 char *endptr; 560 561 NEXT_ARGP(); 562 563 if (*val) { 564 p_err("%s already specified", what); 565 return -1; 566 } 567 568 *val = strtoul(**argv, &endptr, 0); 569 if (*endptr) { 570 p_err("can't parse %s as %s", **argv, what); 571 return -1; 572 } 573 NEXT_ARGP(); 574 575 return 0; 576 } 577 578 int __printf(2, 0) 579 print_all_levels(__maybe_unused enum libbpf_print_level level, 580 const char *format, va_list args) 581 { 582 return vfprintf(stderr, format, args); 583 } 584