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 void p_err(const char *fmt, ...) 59 { 60 va_list ap; 61 62 va_start(ap, fmt); 63 if (json_output) { 64 jsonw_start_object(json_wtr); 65 jsonw_name(json_wtr, "error"); 66 jsonw_vprintf_enquote(json_wtr, fmt, ap); 67 jsonw_end_object(json_wtr); 68 } else { 69 fprintf(stderr, "Error: "); 70 vfprintf(stderr, fmt, ap); 71 fprintf(stderr, "\n"); 72 } 73 va_end(ap); 74 } 75 76 void p_info(const char *fmt, ...) 77 { 78 va_list ap; 79 80 if (json_output) 81 return; 82 83 va_start(ap, fmt); 84 vfprintf(stderr, fmt, ap); 85 fprintf(stderr, "\n"); 86 va_end(ap); 87 } 88 89 static bool is_bpffs(char *path) 90 { 91 struct statfs st_fs; 92 93 if (statfs(path, &st_fs) < 0) 94 return false; 95 96 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC; 97 } 98 99 static int mnt_bpffs(const char *target, char *buff, size_t bufflen) 100 { 101 bool bind_done = false; 102 103 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) { 104 if (errno != EINVAL || bind_done) { 105 snprintf(buff, bufflen, 106 "mount --make-private %s failed: %s", 107 target, strerror(errno)); 108 return -1; 109 } 110 111 if (mount(target, target, "none", MS_BIND, NULL)) { 112 snprintf(buff, bufflen, 113 "mount --bind %s %s failed: %s", 114 target, target, strerror(errno)); 115 return -1; 116 } 117 118 bind_done = true; 119 } 120 121 if (mount("bpf", target, "bpf", 0, "mode=0700")) { 122 snprintf(buff, bufflen, "mount -t bpf bpf %s failed: %s", 123 target, strerror(errno)); 124 return -1; 125 } 126 127 return 0; 128 } 129 130 int open_obj_pinned(char *path) 131 { 132 int fd; 133 134 fd = bpf_obj_get(path); 135 if (fd < 0) { 136 p_err("bpf obj get (%s): %s", path, 137 errno == EACCES && !is_bpffs(dirname(path)) ? 138 "directory not in bpf file system (bpffs)" : 139 strerror(errno)); 140 return -1; 141 } 142 143 return fd; 144 } 145 146 int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type) 147 { 148 enum bpf_obj_type type; 149 int fd; 150 151 fd = open_obj_pinned(path); 152 if (fd < 0) 153 return -1; 154 155 type = get_fd_type(fd); 156 if (type < 0) { 157 close(fd); 158 return type; 159 } 160 if (type != exp_type) { 161 p_err("incorrect object type: %s", get_fd_type_name(type)); 162 close(fd); 163 return -1; 164 } 165 166 return fd; 167 } 168 169 int do_pin_fd(int fd, const char *name) 170 { 171 char err_str[ERR_MAX_LEN]; 172 char *file; 173 char *dir; 174 int err = 0; 175 176 err = bpf_obj_pin(fd, name); 177 if (!err) 178 goto out; 179 180 file = malloc(strlen(name) + 1); 181 strcpy(file, name); 182 dir = dirname(file); 183 184 if (errno != EPERM || is_bpffs(dir)) { 185 p_err("can't pin the object (%s): %s", name, strerror(errno)); 186 goto out_free; 187 } 188 189 /* Attempt to mount bpffs, then retry pinning. */ 190 err = mnt_bpffs(dir, err_str, ERR_MAX_LEN); 191 if (!err) { 192 err = bpf_obj_pin(fd, name); 193 if (err) 194 p_err("can't pin the object (%s): %s", name, 195 strerror(errno)); 196 } else { 197 err_str[ERR_MAX_LEN - 1] = '\0'; 198 p_err("can't mount BPF file system to pin the object (%s): %s", 199 name, err_str); 200 } 201 202 out_free: 203 free(file); 204 out: 205 return err; 206 } 207 208 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32)) 209 { 210 unsigned int id; 211 char *endptr; 212 int err; 213 int fd; 214 215 if (!is_prefix(*argv, "id")) { 216 p_err("expected 'id' got %s", *argv); 217 return -1; 218 } 219 NEXT_ARG(); 220 221 id = strtoul(*argv, &endptr, 0); 222 if (*endptr) { 223 p_err("can't parse %s as ID", *argv); 224 return -1; 225 } 226 NEXT_ARG(); 227 228 if (argc != 1) 229 usage(); 230 231 fd = get_fd_by_id(id); 232 if (fd < 0) { 233 p_err("can't get prog by id (%u): %s", id, strerror(errno)); 234 return -1; 235 } 236 237 err = do_pin_fd(fd, *argv); 238 239 close(fd); 240 return err; 241 } 242 243 const char *get_fd_type_name(enum bpf_obj_type type) 244 { 245 static const char * const names[] = { 246 [BPF_OBJ_UNKNOWN] = "unknown", 247 [BPF_OBJ_PROG] = "prog", 248 [BPF_OBJ_MAP] = "map", 249 }; 250 251 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type]) 252 return names[BPF_OBJ_UNKNOWN]; 253 254 return names[type]; 255 } 256 257 int get_fd_type(int fd) 258 { 259 char path[PATH_MAX]; 260 char buf[512]; 261 ssize_t n; 262 263 snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd); 264 265 n = readlink(path, buf, sizeof(buf)); 266 if (n < 0) { 267 p_err("can't read link type: %s", strerror(errno)); 268 return -1; 269 } 270 if (n == sizeof(path)) { 271 p_err("can't read link type: path too long!"); 272 return -1; 273 } 274 275 if (strstr(buf, "bpf-map")) 276 return BPF_OBJ_MAP; 277 else if (strstr(buf, "bpf-prog")) 278 return BPF_OBJ_PROG; 279 280 return BPF_OBJ_UNKNOWN; 281 } 282 283 char *get_fdinfo(int fd, const char *key) 284 { 285 char path[PATH_MAX]; 286 char *line = NULL; 287 size_t line_n = 0; 288 ssize_t n; 289 FILE *fdi; 290 291 snprintf(path, sizeof(path), "/proc/%d/fdinfo/%d", getpid(), fd); 292 293 fdi = fopen(path, "r"); 294 if (!fdi) { 295 p_err("can't open fdinfo: %s", strerror(errno)); 296 return NULL; 297 } 298 299 while ((n = getline(&line, &line_n, fdi))) { 300 char *value; 301 int len; 302 303 if (!strstr(line, key)) 304 continue; 305 306 fclose(fdi); 307 308 value = strchr(line, '\t'); 309 if (!value || !value[1]) { 310 p_err("malformed fdinfo!?"); 311 free(line); 312 return NULL; 313 } 314 value++; 315 316 len = strlen(value); 317 memmove(line, value, len); 318 line[len - 1] = '\0'; 319 320 return line; 321 } 322 323 p_err("key '%s' not found in fdinfo", key); 324 free(line); 325 fclose(fdi); 326 return NULL; 327 } 328 329 void print_hex_data_json(uint8_t *data, size_t len) 330 { 331 unsigned int i; 332 333 jsonw_start_array(json_wtr); 334 for (i = 0; i < len; i++) 335 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]); 336 jsonw_end_array(json_wtr); 337 } 338 339 int build_pinned_obj_table(struct pinned_obj_table *tab, 340 enum bpf_obj_type type) 341 { 342 struct bpf_prog_info pinned_info = {}; 343 struct pinned_obj *obj_node = NULL; 344 __u32 len = sizeof(pinned_info); 345 struct mntent *mntent = NULL; 346 enum bpf_obj_type objtype; 347 FILE *mntfile = NULL; 348 FTSENT *ftse = NULL; 349 FTS *fts = NULL; 350 int fd, err; 351 352 mntfile = setmntent("/proc/mounts", "r"); 353 if (!mntfile) 354 return -1; 355 356 while ((mntent = getmntent(mntfile))) { 357 char *path[] = { mntent->mnt_dir, NULL }; 358 359 if (strncmp(mntent->mnt_type, "bpf", 3) != 0) 360 continue; 361 362 fts = fts_open(path, 0, NULL); 363 if (!fts) 364 continue; 365 366 while ((ftse = fts_read(fts))) { 367 if (!(ftse->fts_info & FTS_F)) 368 continue; 369 fd = open_obj_pinned(ftse->fts_path); 370 if (fd < 0) 371 continue; 372 373 objtype = get_fd_type(fd); 374 if (objtype != type) { 375 close(fd); 376 continue; 377 } 378 memset(&pinned_info, 0, sizeof(pinned_info)); 379 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len); 380 if (err) { 381 close(fd); 382 continue; 383 } 384 385 obj_node = malloc(sizeof(*obj_node)); 386 if (!obj_node) { 387 close(fd); 388 fts_close(fts); 389 fclose(mntfile); 390 return -1; 391 } 392 393 memset(obj_node, 0, sizeof(*obj_node)); 394 obj_node->id = pinned_info.id; 395 obj_node->path = strdup(ftse->fts_path); 396 hash_add(tab->table, &obj_node->hash, obj_node->id); 397 398 close(fd); 399 } 400 fts_close(fts); 401 } 402 fclose(mntfile); 403 return 0; 404 } 405 406 void delete_pinned_obj_table(struct pinned_obj_table *tab) 407 { 408 struct pinned_obj *obj; 409 struct hlist_node *tmp; 410 unsigned int bkt; 411 412 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) { 413 hash_del(&obj->hash); 414 free(obj->path); 415 free(obj); 416 } 417 } 418 419 static char * 420 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf) 421 { 422 struct stat st; 423 int err; 424 425 err = stat("/proc/self/ns/net", &st); 426 if (err) { 427 p_err("Can't stat /proc/self: %s", strerror(errno)); 428 return NULL; 429 } 430 431 if (st.st_dev != ns_dev || st.st_ino != ns_ino) 432 return NULL; 433 434 return if_indextoname(ifindex, buf); 435 } 436 437 static int read_sysfs_hex_int(char *path) 438 { 439 char vendor_id_buf[8]; 440 int len; 441 int fd; 442 443 fd = open(path, O_RDONLY); 444 if (fd < 0) { 445 p_err("Can't open %s: %s", path, strerror(errno)); 446 return -1; 447 } 448 449 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf)); 450 close(fd); 451 if (len < 0) { 452 p_err("Can't read %s: %s", path, strerror(errno)); 453 return -1; 454 } 455 if (len >= (int)sizeof(vendor_id_buf)) { 456 p_err("Value in %s too long", path); 457 return -1; 458 } 459 460 vendor_id_buf[len] = 0; 461 462 return strtol(vendor_id_buf, NULL, 0); 463 } 464 465 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name) 466 { 467 char full_path[64]; 468 469 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s", 470 devname, entry_name); 471 472 return read_sysfs_hex_int(full_path); 473 } 474 475 const char *ifindex_to_bfd_name_ns(__u32 ifindex, __u64 ns_dev, __u64 ns_ino) 476 { 477 char devname[IF_NAMESIZE]; 478 int vendor_id; 479 int device_id; 480 481 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) { 482 p_err("Can't get net device name for ifindex %d: %s", ifindex, 483 strerror(errno)); 484 return NULL; 485 } 486 487 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor"); 488 if (vendor_id < 0) { 489 p_err("Can't get device vendor id for %s", devname); 490 return NULL; 491 } 492 493 switch (vendor_id) { 494 case 0x19ee: 495 device_id = read_sysfs_netdev_hex_int(devname, "device"); 496 if (device_id != 0x4000 && 497 device_id != 0x6000 && 498 device_id != 0x6003) 499 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch"); 500 return "NFP-6xxx"; 501 default: 502 p_err("Can't get bfd arch name for device vendor id 0x%04x", 503 vendor_id); 504 return NULL; 505 } 506 } 507 508 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 509 { 510 char name[IF_NAMESIZE]; 511 512 if (!ifindex) 513 return; 514 515 printf(" dev "); 516 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 517 printf("%s", name); 518 else 519 printf("ifindex %u ns_dev %llu ns_ino %llu", 520 ifindex, ns_dev, ns_inode); 521 } 522 523 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode) 524 { 525 char name[IF_NAMESIZE]; 526 527 if (!ifindex) 528 return; 529 530 jsonw_name(json_wtr, "dev"); 531 jsonw_start_object(json_wtr); 532 jsonw_uint_field(json_wtr, "ifindex", ifindex); 533 jsonw_uint_field(json_wtr, "ns_dev", ns_dev); 534 jsonw_uint_field(json_wtr, "ns_inode", ns_inode); 535 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name)) 536 jsonw_string_field(json_wtr, "ifname", name); 537 jsonw_end_object(json_wtr); 538 } 539