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