1 /* 2 * Copyright (C) 2017 Netronome Systems, Inc. 3 * 4 * This software is dual licensed under the GNU General License Version 2, 5 * June 1991 as shown in the file COPYING in the top-level directory of this 6 * source tree or the BSD 2-Clause License provided below. You have the 7 * option to license this software under the complete terms of either license. 8 * 9 * The BSD 2-Clause License: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * 1. Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * 2. Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 /* Author: Jakub Kicinski <kubakici@wp.pl> */ 35 36 #include <errno.h> 37 #include <fcntl.h> 38 #include <fts.h> 39 #include <libgen.h> 40 #include <mntent.h> 41 #include <stdbool.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include <linux/limits.h> 47 #include <linux/magic.h> 48 #include <net/if.h> 49 #include <sys/mount.h> 50 #include <sys/stat.h> 51 #include <sys/types.h> 52 #include <sys/vfs.h> 53 54 #include <bpf.h> 55 56 #include "main.h" 57 58 #ifndef BPF_FS_MAGIC 59 #define BPF_FS_MAGIC 0xcafe4a11 60 #endif 61 62 void p_err(const char *fmt, ...) 63 { 64 va_list ap; 65 66 va_start(ap, fmt); 67 if (json_output) { 68 jsonw_start_object(json_wtr); 69 jsonw_name(json_wtr, "error"); 70 jsonw_vprintf_enquote(json_wtr, fmt, ap); 71 jsonw_end_object(json_wtr); 72 } else { 73 fprintf(stderr, "Error: "); 74 vfprintf(stderr, fmt, ap); 75 fprintf(stderr, "\n"); 76 } 77 va_end(ap); 78 } 79 80 void p_info(const char *fmt, ...) 81 { 82 va_list ap; 83 84 if (json_output) 85 return; 86 87 va_start(ap, fmt); 88 vfprintf(stderr, fmt, ap); 89 fprintf(stderr, "\n"); 90 va_end(ap); 91 } 92 93 static bool is_bpffs(char *path) 94 { 95 struct statfs st_fs; 96 97 if (statfs(path, &st_fs) < 0) 98 return false; 99 100 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC; 101 } 102 103 static int mnt_bpffs(const char *target, char *buff, size_t bufflen) 104 { 105 bool bind_done = false; 106 107 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) { 108 if (errno != EINVAL || bind_done) { 109 snprintf(buff, bufflen, 110 "mount --make-private %s failed: %s", 111 target, strerror(errno)); 112 return -1; 113 } 114 115 if (mount(target, target, "none", MS_BIND, NULL)) { 116 snprintf(buff, bufflen, 117 "mount --bind %s %s failed: %s", 118 target, target, strerror(errno)); 119 return -1; 120 } 121 122 bind_done = true; 123 } 124 125 if (mount("bpf", target, "bpf", 0, "mode=0700")) { 126 snprintf(buff, bufflen, "mount -t bpf bpf %s failed: %s", 127 target, strerror(errno)); 128 return -1; 129 } 130 131 return 0; 132 } 133 134 int open_obj_pinned(char *path) 135 { 136 int fd; 137 138 fd = bpf_obj_get(path); 139 if (fd < 0) { 140 p_err("bpf obj get (%s): %s", path, 141 errno == EACCES && !is_bpffs(dirname(path)) ? 142 "directory not in bpf file system (bpffs)" : 143 strerror(errno)); 144 return -1; 145 } 146 147 return fd; 148 } 149 150 int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type) 151 { 152 enum bpf_obj_type type; 153 int fd; 154 155 fd = open_obj_pinned(path); 156 if (fd < 0) 157 return -1; 158 159 type = get_fd_type(fd); 160 if (type < 0) { 161 close(fd); 162 return type; 163 } 164 if (type != exp_type) { 165 p_err("incorrect object type: %s", get_fd_type_name(type)); 166 close(fd); 167 return -1; 168 } 169 170 return fd; 171 } 172 173 int do_pin_fd(int fd, const char *name) 174 { 175 char err_str[ERR_MAX_LEN]; 176 char *file; 177 char *dir; 178 int err = 0; 179 180 err = bpf_obj_pin(fd, name); 181 if (!err) 182 goto out; 183 184 file = malloc(strlen(name) + 1); 185 strcpy(file, name); 186 dir = dirname(file); 187 188 if (errno != EPERM || is_bpffs(dir)) { 189 p_err("can't pin the object (%s): %s", name, strerror(errno)); 190 goto out_free; 191 } 192 193 /* Attempt to mount bpffs, then retry pinning. */ 194 err = mnt_bpffs(dir, err_str, ERR_MAX_LEN); 195 if (!err) { 196 err = bpf_obj_pin(fd, name); 197 if (err) 198 p_err("can't pin the object (%s): %s", name, 199 strerror(errno)); 200 } else { 201 err_str[ERR_MAX_LEN - 1] = '\0'; 202 p_err("can't mount BPF file system to pin the object (%s): %s", 203 name, err_str); 204 } 205 206 out_free: 207 free(file); 208 out: 209 return err; 210 } 211 212 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32)) 213 { 214 unsigned int id; 215 char *endptr; 216 int err; 217 int fd; 218 219 if (!is_prefix(*argv, "id")) { 220 p_err("expected 'id' got %s", *argv); 221 return -1; 222 } 223 NEXT_ARG(); 224 225 id = strtoul(*argv, &endptr, 0); 226 if (*endptr) { 227 p_err("can't parse %s as ID", *argv); 228 return -1; 229 } 230 NEXT_ARG(); 231 232 if (argc != 1) 233 usage(); 234 235 fd = get_fd_by_id(id); 236 if (fd < 0) { 237 p_err("can't get prog by id (%u): %s", id, strerror(errno)); 238 return -1; 239 } 240 241 err = do_pin_fd(fd, *argv); 242 243 close(fd); 244 return err; 245 } 246 247 const char *get_fd_type_name(enum bpf_obj_type type) 248 { 249 static const char * const names[] = { 250 [BPF_OBJ_UNKNOWN] = "unknown", 251 [BPF_OBJ_PROG] = "prog", 252 [BPF_OBJ_MAP] = "map", 253 }; 254 255 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) 256 return names[BPF_OBJ_UNKNOWN]; 257 258 return names[type]; 259 } 260 261 int get_fd_type(int fd) 262 { 263 char path[PATH_MAX]; 264 char buf[512]; 265 ssize_t n; 266 267 snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd); 268 269 n = readlink(path, buf, sizeof(buf)); 270 if (n < 0) { 271 p_err("can't read link type: %s", strerror(errno)); 272 return -1; 273 } 274 if (n == sizeof(path)) { 275 p_err("can't read link type: path too long!"); 276 return -1; 277 } 278 279 if (strstr(buf, "bpf-map")) 280 return BPF_OBJ_MAP; 281 else if (strstr(buf, "bpf-prog")) 282 return BPF_OBJ_PROG; 283 284 return BPF_OBJ_UNKNOWN; 285 } 286 287 char *get_fdinfo(int fd, const char *key) 288 { 289 char path[PATH_MAX]; 290 char *line = NULL; 291 size_t line_n = 0; 292 ssize_t n; 293 FILE *fdi; 294 295 snprintf(path, sizeof(path), "/proc/%d/fdinfo/%d", getpid(), fd); 296 297 fdi = fopen(path, "r"); 298 if (!fdi) { 299 p_err("can't open fdinfo: %s", strerror(errno)); 300 return NULL; 301 } 302 303 while ((n = getline(&line, &line_n, fdi))) { 304 char *value; 305 int len; 306 307 if (!strstr(line, key)) 308 continue; 309 310 fclose(fdi); 311 312 value = strchr(line, '\t'); 313 if (!value || !value[1]) { 314 p_err("malformed fdinfo!?"); 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 p_err("key '%s' not found in fdinfo", key); 328 free(line); 329 fclose(fdi); 330 return NULL; 331 } 332 333 void print_hex_data_json(uint8_t *data, size_t len) 334 { 335 unsigned int i; 336 337 jsonw_start_array(json_wtr); 338 for (i = 0; i < len; i++) 339 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); 340 jsonw_end_array(json_wtr); 341 } 342 343 int build_pinned_obj_table(struct pinned_obj_table *tab, 344 enum bpf_obj_type type) 345 { 346 struct bpf_prog_info pinned_info = {}; 347 struct pinned_obj *obj_node = NULL; 348 __u32 len = sizeof(pinned_info); 349 struct mntent *mntent = NULL; 350 enum bpf_obj_type objtype; 351 FILE *mntfile = NULL; 352 FTSENT *ftse = NULL; 353 FTS *fts = NULL; 354 int fd, err; 355 356 mntfile = setmntent("/proc/mounts", "r"); 357 if (!mntfile) 358 return -1; 359 360 while ((mntent = getmntent(mntfile))) { 361 char *path[] = { mntent->mnt_dir, NULL }; 362 363 if (strncmp(mntent->mnt_type, "bpf", 3) != 0) 364 continue; 365 366 fts = fts_open(path, 0, NULL); 367 if (!fts) 368 continue; 369 370 while ((ftse = fts_read(fts))) { 371 if (!(ftse->fts_info & FTS_F)) 372 continue; 373 fd = open_obj_pinned(ftse->fts_path); 374 if (fd < 0) 375 continue; 376 377 objtype = get_fd_type(fd); 378 if (objtype != type) { 379 close(fd); 380 continue; 381 } 382 memset(&pinned_info, 0, sizeof(pinned_info)); 383 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len); 384 if (err) { 385 close(fd); 386 continue; 387 } 388 389 obj_node = malloc(sizeof(*obj_node)); 390 if (!obj_node) { 391 close(fd); 392 fts_close(fts); 393 fclose(mntfile); 394 return -1; 395 } 396 397 memset(obj_node, 0, sizeof(*obj_node)); 398 obj_node->id = pinned_info.id; 399 obj_node->path = strdup(ftse->fts_path); 400 hash_add(tab->table, &obj_node->hash, obj_node->id); 401 402 close(fd); 403 } 404 fts_close(fts); 405 } 406 fclose(mntfile); 407 return 0; 408 } 409 410 void delete_pinned_obj_table(struct pinned_obj_table *tab) 411 { 412 struct pinned_obj *obj; 413 struct hlist_node *tmp; 414 unsigned int bkt; 415 416 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) { 417 hash_del(&obj->hash); 418 free(obj->path); 419 free(obj); 420 } 421 } 422 423 static char * 424 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) 425 { 426 struct stat st; 427 int err; 428 429 err = stat("/proc/self/ns/net", &st); 430 if (err) { 431 p_err("Can't stat /proc/self: %s", strerror(errno)); 432 return NULL; 433 } 434 435 if (st.st_dev != ns_dev || st.st_ino != ns_ino) 436 return NULL; 437 438 return if_indextoname(ifindex, buf); 439 } 440 441 static int read_sysfs_hex_int(char *path) 442 { 443 char vendor_id_buf[8]; 444 int len; 445 int fd; 446 447 fd = open(path, O_RDONLY); 448 if (fd < 0) { 449 p_err("Can't open %s: %s", path, strerror(errno)); 450 return -1; 451 } 452 453 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); 454 close(fd); 455 if (len < 0) { 456 p_err("Can't read %s: %s", path, strerror(errno)); 457 return -1; 458 } 459 if (len >= (int)sizeof(vendor_id_buf)) { 460 p_err("Value in %s too long", path); 461 return -1; 462 } 463 464 vendor_id_buf[len] = 0; 465 466 return strtol(vendor_id_buf, NULL, 0); 467 } 468 469 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) 470 { 471 char full_path[64]; 472 473 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", 474 devname, entry_name); 475 476 return read_sysfs_hex_int(full_path); 477 } 478 479 const char *ifindex_to_bfd_name_ns(__u32 ifindex, __u64 ns_dev, __u64 ns_ino) 480 { 481 char devname[IF_NAMESIZE]; 482 int vendor_id; 483 int device_id; 484 485 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { 486 p_err("Can't get net device name for ifindex %d: %s", ifindex, 487 strerror(errno)); 488 return NULL; 489 } 490 491 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); 492 if (vendor_id < 0) { 493 p_err("Can't get device vendor id for %s", devname); 494 return NULL; 495 } 496 497 switch (vendor_id) { 498 case 0x19ee: 499 device_id = read_sysfs_netdev_hex_int(devname, "device"); 500 if (device_id != 0x4000 && 501 device_id != 0x6000 && 502 device_id != 0x6003) 503 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); 504 return "NFP-6xxx"; 505 default: 506 p_err("Can't get bfd arch name for device vendor id 0x%04x", 507 vendor_id); 508 return NULL; 509 } 510 } 511 512 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 513 { 514 char name[IF_NAMESIZE]; 515 516 if (!ifindex) 517 return; 518 519 printf(" dev "); 520 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 521 printf("%s", name); 522 else 523 printf("ifindex %u ns_dev %llu ns_ino %llu", 524 ifindex, ns_dev, ns_inode); 525 } 526 527 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 528 { 529 char name[IF_NAMESIZE]; 530 531 if (!ifindex) 532 return; 533 534 jsonw_name(json_wtr, "dev"); 535 jsonw_start_object(json_wtr); 536 jsonw_uint_field(json_wtr, "ifindex", ifindex); 537 jsonw_uint_field(json_wtr, "ns_dev", ns_dev); 538 jsonw_uint_field(json_wtr, "ns_inode", ns_inode); 539 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 540 jsonw_string_field(json_wtr, "ifname", name); 541 jsonw_end_object(json_wtr); 542 } 543