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 25 #include "main.h" 26 27 #ifndef BPF_FS_MAGIC 28 #define BPF_FS_MAGIC 0xcafe4a11 29 #endif 30 31 void p_err(const char *fmt, ...) 32 { 33 va_list ap; 34 35 va_start(ap, fmt); 36 if (json_output) { 37 jsonw_start_object(json_wtr); 38 jsonw_name(json_wtr, "error"); 39 jsonw_vprintf_enquote(json_wtr, fmt, ap); 40 jsonw_end_object(json_wtr); 41 } else { 42 fprintf(stderr, "Error: "); 43 vfprintf(stderr, fmt, ap); 44 fprintf(stderr, "\n"); 45 } 46 va_end(ap); 47 } 48 49 void p_info(const char *fmt, ...) 50 { 51 va_list ap; 52 53 if (json_output) 54 return; 55 56 va_start(ap, fmt); 57 vfprintf(stderr, fmt, ap); 58 fprintf(stderr, "\n"); 59 va_end(ap); 60 } 61 62 static bool is_bpffs(char *path) 63 { 64 struct statfs st_fs; 65 66 if (statfs(path, &st_fs) < 0) 67 return false; 68 69 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC; 70 } 71 72 void set_max_rlimit(void) 73 { 74 struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY }; 75 76 setrlimit(RLIMIT_MEMLOCK, &rinf); 77 } 78 79 static int mnt_bpffs(const char *target, char *buff, size_t bufflen) 80 { 81 bool bind_done = false; 82 83 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) { 84 if (errno != EINVAL || bind_done) { 85 snprintf(buff, bufflen, 86 "mount --make-private %s failed: %s", 87 target, strerror(errno)); 88 return -1; 89 } 90 91 if (mount(target, target, "none", MS_BIND, NULL)) { 92 snprintf(buff, bufflen, 93 "mount --bind %s %s failed: %s", 94 target, target, strerror(errno)); 95 return -1; 96 } 97 98 bind_done = true; 99 } 100 101 if (mount("bpf", target, "bpf", 0, "mode=0700")) { 102 snprintf(buff, bufflen, "mount -t bpf bpf %s failed: %s", 103 target, strerror(errno)); 104 return -1; 105 } 106 107 return 0; 108 } 109 110 int open_obj_pinned(char *path, bool quiet) 111 { 112 int fd; 113 114 fd = bpf_obj_get(path); 115 if (fd < 0) { 116 if (!quiet) 117 p_err("bpf obj get (%s): %s", path, 118 errno == EACCES && !is_bpffs(dirname(path)) ? 119 "directory not in bpf file system (bpffs)" : 120 strerror(errno)); 121 return -1; 122 } 123 124 return fd; 125 } 126 127 int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type) 128 { 129 enum bpf_obj_type type; 130 int fd; 131 132 fd = open_obj_pinned(path, false); 133 if (fd < 0) 134 return -1; 135 136 type = get_fd_type(fd); 137 if (type < 0) { 138 close(fd); 139 return type; 140 } 141 if (type != exp_type) { 142 p_err("incorrect object type: %s", get_fd_type_name(type)); 143 close(fd); 144 return -1; 145 } 146 147 return fd; 148 } 149 150 int mount_bpffs_for_pin(const char *name) 151 { 152 char err_str[ERR_MAX_LEN]; 153 char *file; 154 char *dir; 155 int err = 0; 156 157 file = malloc(strlen(name) + 1); 158 strcpy(file, name); 159 dir = dirname(file); 160 161 if (is_bpffs(dir)) 162 /* nothing to do if already mounted */ 163 goto out_free; 164 165 err = mnt_bpffs(dir, err_str, ERR_MAX_LEN); 166 if (err) { 167 err_str[ERR_MAX_LEN - 1] = '\0'; 168 p_err("can't mount BPF file system to pin the object (%s): %s", 169 name, err_str); 170 } 171 172 out_free: 173 free(file); 174 return err; 175 } 176 177 int do_pin_fd(int fd, const char *name) 178 { 179 int err; 180 181 err = mount_bpffs_for_pin(name); 182 if (err) 183 return err; 184 185 return bpf_obj_pin(fd, name); 186 } 187 188 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32)) 189 { 190 unsigned int id; 191 char *endptr; 192 int err; 193 int fd; 194 195 if (argc < 3) { 196 p_err("too few arguments, id ID and FILE path is required"); 197 return -1; 198 } else if (argc > 3) { 199 p_err("too many arguments"); 200 return -1; 201 } 202 203 if (!is_prefix(*argv, "id")) { 204 p_err("expected 'id' got %s", *argv); 205 return -1; 206 } 207 NEXT_ARG(); 208 209 id = strtoul(*argv, &endptr, 0); 210 if (*endptr) { 211 p_err("can't parse %s as ID", *argv); 212 return -1; 213 } 214 NEXT_ARG(); 215 216 fd = get_fd_by_id(id); 217 if (fd < 0) { 218 p_err("can't get prog by id (%u): %s", id, strerror(errno)); 219 return -1; 220 } 221 222 err = do_pin_fd(fd, *argv); 223 224 close(fd); 225 return err; 226 } 227 228 const char *get_fd_type_name(enum bpf_obj_type type) 229 { 230 static const char * const names[] = { 231 [BPF_OBJ_UNKNOWN] = "unknown", 232 [BPF_OBJ_PROG] = "prog", 233 [BPF_OBJ_MAP] = "map", 234 }; 235 236 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) 237 return names[BPF_OBJ_UNKNOWN]; 238 239 return names[type]; 240 } 241 242 int get_fd_type(int fd) 243 { 244 char path[PATH_MAX]; 245 char buf[512]; 246 ssize_t n; 247 248 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd); 249 250 n = readlink(path, buf, sizeof(buf)); 251 if (n < 0) { 252 p_err("can't read link type: %s", strerror(errno)); 253 return -1; 254 } 255 if (n == sizeof(path)) { 256 p_err("can't read link type: path too long!"); 257 return -1; 258 } 259 260 if (strstr(buf, "bpf-map")) 261 return BPF_OBJ_MAP; 262 else if (strstr(buf, "bpf-prog")) 263 return BPF_OBJ_PROG; 264 265 return BPF_OBJ_UNKNOWN; 266 } 267 268 char *get_fdinfo(int fd, const char *key) 269 { 270 char path[PATH_MAX]; 271 char *line = NULL; 272 size_t line_n = 0; 273 ssize_t n; 274 FILE *fdi; 275 276 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); 277 278 fdi = fopen(path, "r"); 279 if (!fdi) { 280 p_err("can't open fdinfo: %s", strerror(errno)); 281 return NULL; 282 } 283 284 while ((n = getline(&line, &line_n, fdi)) > 0) { 285 char *value; 286 int len; 287 288 if (!strstr(line, key)) 289 continue; 290 291 fclose(fdi); 292 293 value = strchr(line, '\t'); 294 if (!value || !value[1]) { 295 p_err("malformed fdinfo!?"); 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 p_err("key '%s' not found in fdinfo", key); 309 free(line); 310 fclose(fdi); 311 return NULL; 312 } 313 314 void print_data_json(uint8_t *data, size_t len) 315 { 316 unsigned int i; 317 318 jsonw_start_array(json_wtr); 319 for (i = 0; i < len; i++) 320 jsonw_printf(json_wtr, "%d", data[i]); 321 jsonw_end_array(json_wtr); 322 } 323 324 void print_hex_data_json(uint8_t *data, size_t len) 325 { 326 unsigned int i; 327 328 jsonw_start_array(json_wtr); 329 for (i = 0; i < len; i++) 330 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); 331 jsonw_end_array(json_wtr); 332 } 333 334 int build_pinned_obj_table(struct pinned_obj_table *tab, 335 enum bpf_obj_type type) 336 { 337 struct bpf_prog_info pinned_info = {}; 338 struct pinned_obj *obj_node = NULL; 339 __u32 len = sizeof(pinned_info); 340 struct mntent *mntent = NULL; 341 enum bpf_obj_type objtype; 342 FILE *mntfile = NULL; 343 FTSENT *ftse = NULL; 344 FTS *fts = NULL; 345 int fd, err; 346 347 mntfile = setmntent("/proc/mounts", "r"); 348 if (!mntfile) 349 return -1; 350 351 while ((mntent = getmntent(mntfile))) { 352 char *path[] = { mntent->mnt_dir, NULL }; 353 354 if (strncmp(mntent->mnt_type, "bpf", 3) != 0) 355 continue; 356 357 fts = fts_open(path, 0, NULL); 358 if (!fts) 359 continue; 360 361 while ((ftse = fts_read(fts))) { 362 if (!(ftse->fts_info & FTS_F)) 363 continue; 364 fd = open_obj_pinned(ftse->fts_path, true); 365 if (fd < 0) 366 continue; 367 368 objtype = get_fd_type(fd); 369 if (objtype != type) { 370 close(fd); 371 continue; 372 } 373 memset(&pinned_info, 0, sizeof(pinned_info)); 374 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len); 375 if (err) { 376 close(fd); 377 continue; 378 } 379 380 obj_node = malloc(sizeof(*obj_node)); 381 if (!obj_node) { 382 close(fd); 383 fts_close(fts); 384 fclose(mntfile); 385 return -1; 386 } 387 388 memset(obj_node, 0, sizeof(*obj_node)); 389 obj_node->id = pinned_info.id; 390 obj_node->path = strdup(ftse->fts_path); 391 hash_add(tab->table, &obj_node->hash, obj_node->id); 392 393 close(fd); 394 } 395 fts_close(fts); 396 } 397 fclose(mntfile); 398 return 0; 399 } 400 401 void delete_pinned_obj_table(struct pinned_obj_table *tab) 402 { 403 struct pinned_obj *obj; 404 struct hlist_node *tmp; 405 unsigned int bkt; 406 407 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) { 408 hash_del(&obj->hash); 409 free(obj->path); 410 free(obj); 411 } 412 } 413 414 unsigned int get_page_size(void) 415 { 416 static int result; 417 418 if (!result) 419 result = getpagesize(); 420 return result; 421 } 422 423 unsigned int get_possible_cpus(void) 424 { 425 static unsigned int result; 426 char buf[128]; 427 long int n; 428 char *ptr; 429 int fd; 430 431 if (result) 432 return result; 433 434 fd = open("/sys/devices/system/cpu/possible", O_RDONLY); 435 if (fd < 0) { 436 p_err("can't open sysfs possible cpus"); 437 exit(-1); 438 } 439 440 n = read(fd, buf, sizeof(buf)); 441 if (n < 2) { 442 p_err("can't read sysfs possible cpus"); 443 exit(-1); 444 } 445 close(fd); 446 447 if (n == sizeof(buf)) { 448 p_err("read sysfs possible cpus overflow"); 449 exit(-1); 450 } 451 452 ptr = buf; 453 n = 0; 454 while (*ptr && *ptr != '\n') { 455 unsigned int a, b; 456 457 if (sscanf(ptr, "%u-%u", &a, &b) == 2) { 458 n += b - a + 1; 459 460 ptr = strchr(ptr, '-') + 1; 461 } else if (sscanf(ptr, "%u", &a) == 1) { 462 n++; 463 } else { 464 assert(0); 465 } 466 467 while (isdigit(*ptr)) 468 ptr++; 469 if (*ptr == ',') 470 ptr++; 471 } 472 473 result = n; 474 475 return result; 476 } 477 478 static char * 479 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) 480 { 481 struct stat st; 482 int err; 483 484 err = stat("/proc/self/ns/net", &st); 485 if (err) { 486 p_err("Can't stat /proc/self: %s", strerror(errno)); 487 return NULL; 488 } 489 490 if (st.st_dev != ns_dev || st.st_ino != ns_ino) 491 return NULL; 492 493 return if_indextoname(ifindex, buf); 494 } 495 496 static int read_sysfs_hex_int(char *path) 497 { 498 char vendor_id_buf[8]; 499 int len; 500 int fd; 501 502 fd = open(path, O_RDONLY); 503 if (fd < 0) { 504 p_err("Can't open %s: %s", path, strerror(errno)); 505 return -1; 506 } 507 508 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); 509 close(fd); 510 if (len < 0) { 511 p_err("Can't read %s: %s", path, strerror(errno)); 512 return -1; 513 } 514 if (len >= (int)sizeof(vendor_id_buf)) { 515 p_err("Value in %s too long", path); 516 return -1; 517 } 518 519 vendor_id_buf[len] = 0; 520 521 return strtol(vendor_id_buf, NULL, 0); 522 } 523 524 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) 525 { 526 char full_path[64]; 527 528 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", 529 devname, entry_name); 530 531 return read_sysfs_hex_int(full_path); 532 } 533 534 const char * 535 ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, 536 const char **opt) 537 { 538 char devname[IF_NAMESIZE]; 539 int vendor_id; 540 int device_id; 541 542 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { 543 p_err("Can't get net device name for ifindex %d: %s", ifindex, 544 strerror(errno)); 545 return NULL; 546 } 547 548 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); 549 if (vendor_id < 0) { 550 p_err("Can't get device vendor id for %s", devname); 551 return NULL; 552 } 553 554 switch (vendor_id) { 555 case 0x19ee: 556 device_id = read_sysfs_netdev_hex_int(devname, "device"); 557 if (device_id != 0x4000 && 558 device_id != 0x6000 && 559 device_id != 0x6003) 560 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); 561 *opt = "ctx4"; 562 return "NFP-6xxx"; 563 default: 564 p_err("Can't get bfd arch name for device vendor id 0x%04x", 565 vendor_id); 566 return NULL; 567 } 568 } 569 570 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 571 { 572 char name[IF_NAMESIZE]; 573 574 if (!ifindex) 575 return; 576 577 printf(" offloaded_to "); 578 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 579 printf("%s", name); 580 else 581 printf("ifindex %u ns_dev %llu ns_ino %llu", 582 ifindex, ns_dev, ns_inode); 583 } 584 585 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 586 { 587 char name[IF_NAMESIZE]; 588 589 if (!ifindex) 590 return; 591 592 jsonw_name(json_wtr, "dev"); 593 jsonw_start_object(json_wtr); 594 jsonw_uint_field(json_wtr, "ifindex", ifindex); 595 jsonw_uint_field(json_wtr, "ns_dev", ns_dev); 596 jsonw_uint_field(json_wtr, "ns_inode", ns_inode); 597 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 598 jsonw_string_field(json_wtr, "ifname", name); 599 jsonw_end_object(json_wtr); 600 } 601 602 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what) 603 { 604 char *endptr; 605 606 NEXT_ARGP(); 607 608 if (*val) { 609 p_err("%s already specified", what); 610 return -1; 611 } 612 613 *val = strtoul(**argv, &endptr, 0); 614 if (*endptr) { 615 p_err("can't parse %s as %s", **argv, what); 616 return -1; 617 } 618 NEXT_ARGP(); 619 620 return 0; 621 } 622