1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* /proc interface for AFS 3 * 4 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 #include <linux/slab.h> 9 #include <linux/module.h> 10 #include <linux/proc_fs.h> 11 #include <linux/seq_file.h> 12 #include <linux/sched.h> 13 #include <linux/uaccess.h> 14 #include "internal.h" 15 16 struct afs_vl_seq_net_private { 17 struct seq_net_private seq; /* Must be first */ 18 struct afs_vlserver_list *vllist; 19 }; 20 21 static inline struct afs_net *afs_seq2net(struct seq_file *m) 22 { 23 return afs_net(seq_file_net(m)); 24 } 25 26 static inline struct afs_net *afs_seq2net_single(struct seq_file *m) 27 { 28 return afs_net(seq_file_single_net(m)); 29 } 30 31 /* 32 * Display the list of cells known to the namespace. 33 */ 34 static int afs_proc_cells_show(struct seq_file *m, void *v) 35 { 36 struct afs_vlserver_list *vllist; 37 struct afs_cell *cell; 38 39 if (v == SEQ_START_TOKEN) { 40 /* display header on line 1 */ 41 seq_puts(m, "USE TTL SV ST NAME\n"); 42 return 0; 43 } 44 45 cell = list_entry(v, struct afs_cell, proc_link); 46 vllist = rcu_dereference(cell->vl_servers); 47 48 /* display one cell per line on subsequent lines */ 49 seq_printf(m, "%3u %6lld %2u %2u %s\n", 50 atomic_read(&cell->usage), 51 cell->dns_expiry - ktime_get_real_seconds(), 52 vllist->nr_servers, 53 cell->state, 54 cell->name); 55 return 0; 56 } 57 58 static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos) 59 __acquires(rcu) 60 { 61 rcu_read_lock(); 62 return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos); 63 } 64 65 static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos) 66 { 67 return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos); 68 } 69 70 static void afs_proc_cells_stop(struct seq_file *m, void *v) 71 __releases(rcu) 72 { 73 rcu_read_unlock(); 74 } 75 76 static const struct seq_operations afs_proc_cells_ops = { 77 .start = afs_proc_cells_start, 78 .next = afs_proc_cells_next, 79 .stop = afs_proc_cells_stop, 80 .show = afs_proc_cells_show, 81 }; 82 83 /* 84 * handle writes to /proc/fs/afs/cells 85 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]" 86 */ 87 static int afs_proc_cells_write(struct file *file, char *buf, size_t size) 88 { 89 struct seq_file *m = file->private_data; 90 struct afs_net *net = afs_seq2net(m); 91 char *name, *args; 92 int ret; 93 94 /* trim to first NL */ 95 name = memchr(buf, '\n', size); 96 if (name) 97 *name = 0; 98 99 /* split into command, name and argslist */ 100 name = strchr(buf, ' '); 101 if (!name) 102 goto inval; 103 do { 104 *name++ = 0; 105 } while(*name == ' '); 106 if (!*name) 107 goto inval; 108 109 args = strchr(name, ' '); 110 if (args) { 111 do { 112 *args++ = 0; 113 } while(*args == ' '); 114 if (!*args) 115 goto inval; 116 } 117 118 /* determine command to perform */ 119 _debug("cmd=%s name=%s args=%s", buf, name, args); 120 121 if (strcmp(buf, "add") == 0) { 122 struct afs_cell *cell; 123 124 cell = afs_lookup_cell(net, name, strlen(name), args, true); 125 if (IS_ERR(cell)) { 126 ret = PTR_ERR(cell); 127 goto done; 128 } 129 130 if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags)) 131 afs_put_cell(net, cell); 132 } else { 133 goto inval; 134 } 135 136 ret = 0; 137 138 done: 139 _leave(" = %d", ret); 140 return ret; 141 142 inval: 143 ret = -EINVAL; 144 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n"); 145 goto done; 146 } 147 148 /* 149 * Display the name of the current workstation cell. 150 */ 151 static int afs_proc_rootcell_show(struct seq_file *m, void *v) 152 { 153 struct afs_cell *cell; 154 struct afs_net *net; 155 156 net = afs_seq2net_single(m); 157 if (rcu_access_pointer(net->ws_cell)) { 158 rcu_read_lock(); 159 cell = rcu_dereference(net->ws_cell); 160 if (cell) 161 seq_printf(m, "%s\n", cell->name); 162 rcu_read_unlock(); 163 } 164 return 0; 165 } 166 167 /* 168 * Set the current workstation cell and optionally supply its list of volume 169 * location servers. 170 * 171 * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell 172 */ 173 static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size) 174 { 175 struct seq_file *m = file->private_data; 176 struct afs_net *net = afs_seq2net_single(m); 177 char *s; 178 int ret; 179 180 ret = -EINVAL; 181 if (buf[0] == '.') 182 goto out; 183 if (memchr(buf, '/', size)) 184 goto out; 185 186 /* trim to first NL */ 187 s = memchr(buf, '\n', size); 188 if (s) 189 *s = 0; 190 191 /* determine command to perform */ 192 _debug("rootcell=%s", buf); 193 194 ret = afs_cell_init(net, buf); 195 196 out: 197 _leave(" = %d", ret); 198 return ret; 199 } 200 201 static const char afs_vol_types[3][3] = { 202 [AFSVL_RWVOL] = "RW", 203 [AFSVL_ROVOL] = "RO", 204 [AFSVL_BACKVOL] = "BK", 205 }; 206 207 /* 208 * Display the list of volumes known to a cell. 209 */ 210 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v) 211 { 212 struct afs_volume *vol = hlist_entry(v, struct afs_volume, proc_link); 213 214 /* Display header on line 1 */ 215 if (v == SEQ_START_TOKEN) { 216 seq_puts(m, "USE VID TY NAME\n"); 217 return 0; 218 } 219 220 seq_printf(m, "%3d %08llx %s %s\n", 221 atomic_read(&vol->usage), vol->vid, 222 afs_vol_types[vol->type], 223 vol->name); 224 225 return 0; 226 } 227 228 static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos) 229 __acquires(cell->proc_lock) 230 { 231 struct afs_cell *cell = PDE_DATA(file_inode(m->file)); 232 233 rcu_read_lock(); 234 return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos); 235 } 236 237 static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v, 238 loff_t *_pos) 239 { 240 struct afs_cell *cell = PDE_DATA(file_inode(m->file)); 241 242 return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos); 243 } 244 245 static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v) 246 __releases(cell->proc_lock) 247 { 248 rcu_read_unlock(); 249 } 250 251 static const struct seq_operations afs_proc_cell_volumes_ops = { 252 .start = afs_proc_cell_volumes_start, 253 .next = afs_proc_cell_volumes_next, 254 .stop = afs_proc_cell_volumes_stop, 255 .show = afs_proc_cell_volumes_show, 256 }; 257 258 static const char *const dns_record_sources[NR__dns_record_source + 1] = { 259 [DNS_RECORD_UNAVAILABLE] = "unav", 260 [DNS_RECORD_FROM_CONFIG] = "cfg", 261 [DNS_RECORD_FROM_DNS_A] = "A", 262 [DNS_RECORD_FROM_DNS_AFSDB] = "AFSDB", 263 [DNS_RECORD_FROM_DNS_SRV] = "SRV", 264 [DNS_RECORD_FROM_NSS] = "nss", 265 [NR__dns_record_source] = "[weird]" 266 }; 267 268 static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = { 269 [DNS_LOOKUP_NOT_DONE] = "no-lookup", 270 [DNS_LOOKUP_GOOD] = "good", 271 [DNS_LOOKUP_GOOD_WITH_BAD] = "good/bad", 272 [DNS_LOOKUP_BAD] = "bad", 273 [DNS_LOOKUP_GOT_NOT_FOUND] = "not-found", 274 [DNS_LOOKUP_GOT_LOCAL_FAILURE] = "local-failure", 275 [DNS_LOOKUP_GOT_TEMP_FAILURE] = "temp-failure", 276 [DNS_LOOKUP_GOT_NS_FAILURE] = "ns-failure", 277 [NR__dns_lookup_status] = "[weird]" 278 }; 279 280 /* 281 * Display the list of Volume Location servers we're using for a cell. 282 */ 283 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v) 284 { 285 const struct afs_vl_seq_net_private *priv = m->private; 286 const struct afs_vlserver_list *vllist = priv->vllist; 287 const struct afs_vlserver_entry *entry; 288 const struct afs_vlserver *vlserver; 289 const struct afs_addr_list *alist; 290 int i; 291 292 if (v == SEQ_START_TOKEN) { 293 seq_printf(m, "# source %s, status %s\n", 294 dns_record_sources[vllist ? vllist->source : 0], 295 dns_lookup_statuses[vllist ? vllist->status : 0]); 296 return 0; 297 } 298 299 entry = v; 300 vlserver = entry->server; 301 alist = rcu_dereference(vlserver->addresses); 302 303 seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n", 304 vlserver->name, entry->priority, entry->weight, 305 dns_record_sources[alist ? alist->source : entry->source], 306 dns_lookup_statuses[alist ? alist->status : entry->status]); 307 if (alist) { 308 for (i = 0; i < alist->nr_addrs; i++) 309 seq_printf(m, " %c %pISpc\n", 310 alist->preferred == i ? '>' : '-', 311 &alist->addrs[i].transport); 312 } 313 return 0; 314 } 315 316 static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos) 317 __acquires(rcu) 318 { 319 struct afs_vl_seq_net_private *priv = m->private; 320 struct afs_vlserver_list *vllist; 321 struct afs_cell *cell = PDE_DATA(file_inode(m->file)); 322 loff_t pos = *_pos; 323 324 rcu_read_lock(); 325 326 vllist = rcu_dereference(cell->vl_servers); 327 priv->vllist = vllist; 328 329 if (pos < 0) 330 *_pos = pos = 0; 331 if (pos == 0) 332 return SEQ_START_TOKEN; 333 334 if (pos - 1 >= vllist->nr_servers) 335 return NULL; 336 337 return &vllist->servers[pos - 1]; 338 } 339 340 static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v, 341 loff_t *_pos) 342 { 343 struct afs_vl_seq_net_private *priv = m->private; 344 struct afs_vlserver_list *vllist = priv->vllist; 345 loff_t pos; 346 347 pos = *_pos; 348 pos++; 349 *_pos = pos; 350 if (!vllist || pos - 1 >= vllist->nr_servers) 351 return NULL; 352 353 return &vllist->servers[pos - 1]; 354 } 355 356 static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v) 357 __releases(rcu) 358 { 359 rcu_read_unlock(); 360 } 361 362 static const struct seq_operations afs_proc_cell_vlservers_ops = { 363 .start = afs_proc_cell_vlservers_start, 364 .next = afs_proc_cell_vlservers_next, 365 .stop = afs_proc_cell_vlservers_stop, 366 .show = afs_proc_cell_vlservers_show, 367 }; 368 369 /* 370 * Display the list of fileservers we're using within a namespace. 371 */ 372 static int afs_proc_servers_show(struct seq_file *m, void *v) 373 { 374 struct afs_server *server; 375 struct afs_addr_list *alist; 376 int i; 377 378 if (v == SEQ_START_TOKEN) { 379 seq_puts(m, "UUID REF ACT\n"); 380 return 0; 381 } 382 383 server = list_entry(v, struct afs_server, proc_link); 384 alist = rcu_dereference(server->addresses); 385 seq_printf(m, "%pU %3d %3d\n", 386 &server->uuid, 387 atomic_read(&server->ref), 388 atomic_read(&server->active)); 389 seq_printf(m, " - info: fl=%lx rtt=%u brk=%x\n", 390 server->flags, server->rtt, server->cb_s_break); 391 seq_printf(m, " - probe: last=%d out=%d\n", 392 (int)(jiffies - server->probed_at) / HZ, 393 atomic_read(&server->probe_outstanding)); 394 seq_printf(m, " - ALIST v=%u rsp=%lx f=%lx\n", 395 alist->version, alist->responded, alist->failed); 396 for (i = 0; i < alist->nr_addrs; i++) 397 seq_printf(m, " [%x] %pISpc%s\n", 398 i, &alist->addrs[i].transport, 399 alist->preferred == i ? "*" : ""); 400 return 0; 401 } 402 403 static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos) 404 __acquires(rcu) 405 { 406 rcu_read_lock(); 407 return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos); 408 } 409 410 static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos) 411 { 412 return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos); 413 } 414 415 static void afs_proc_servers_stop(struct seq_file *m, void *v) 416 __releases(rcu) 417 { 418 rcu_read_unlock(); 419 } 420 421 static const struct seq_operations afs_proc_servers_ops = { 422 .start = afs_proc_servers_start, 423 .next = afs_proc_servers_next, 424 .stop = afs_proc_servers_stop, 425 .show = afs_proc_servers_show, 426 }; 427 428 /* 429 * Display the list of strings that may be substituted for the @sys pathname 430 * macro. 431 */ 432 static int afs_proc_sysname_show(struct seq_file *m, void *v) 433 { 434 struct afs_net *net = afs_seq2net(m); 435 struct afs_sysnames *sysnames = net->sysnames; 436 unsigned int i = (unsigned long)v - 1; 437 438 if (i < sysnames->nr) 439 seq_printf(m, "%s\n", sysnames->subs[i]); 440 return 0; 441 } 442 443 static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos) 444 __acquires(&net->sysnames_lock) 445 { 446 struct afs_net *net = afs_seq2net(m); 447 struct afs_sysnames *names; 448 449 read_lock(&net->sysnames_lock); 450 451 names = net->sysnames; 452 if (*pos >= names->nr) 453 return NULL; 454 return (void *)(unsigned long)(*pos + 1); 455 } 456 457 static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos) 458 { 459 struct afs_net *net = afs_seq2net(m); 460 struct afs_sysnames *names = net->sysnames; 461 462 *pos += 1; 463 if (*pos >= names->nr) 464 return NULL; 465 return (void *)(unsigned long)(*pos + 1); 466 } 467 468 static void afs_proc_sysname_stop(struct seq_file *m, void *v) 469 __releases(&net->sysnames_lock) 470 { 471 struct afs_net *net = afs_seq2net(m); 472 473 read_unlock(&net->sysnames_lock); 474 } 475 476 static const struct seq_operations afs_proc_sysname_ops = { 477 .start = afs_proc_sysname_start, 478 .next = afs_proc_sysname_next, 479 .stop = afs_proc_sysname_stop, 480 .show = afs_proc_sysname_show, 481 }; 482 483 /* 484 * Allow the @sys substitution to be configured. 485 */ 486 static int afs_proc_sysname_write(struct file *file, char *buf, size_t size) 487 { 488 struct afs_sysnames *sysnames, *kill; 489 struct seq_file *m = file->private_data; 490 struct afs_net *net = afs_seq2net(m); 491 char *s, *p, *sub; 492 int ret, len; 493 494 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL); 495 if (!sysnames) 496 return -ENOMEM; 497 refcount_set(&sysnames->usage, 1); 498 kill = sysnames; 499 500 p = buf; 501 while ((s = strsep(&p, " \t\n"))) { 502 len = strlen(s); 503 if (len == 0) 504 continue; 505 ret = -ENAMETOOLONG; 506 if (len >= AFSNAMEMAX) 507 goto error; 508 509 if (len >= 4 && 510 s[len - 4] == '@' && 511 s[len - 3] == 's' && 512 s[len - 2] == 'y' && 513 s[len - 1] == 's') 514 /* Protect against recursion */ 515 goto invalid; 516 517 if (s[0] == '.' && 518 (len < 2 || (len == 2 && s[1] == '.'))) 519 goto invalid; 520 521 if (memchr(s, '/', len)) 522 goto invalid; 523 524 ret = -EFBIG; 525 if (sysnames->nr >= AFS_NR_SYSNAME) 526 goto out; 527 528 if (strcmp(s, afs_init_sysname) == 0) { 529 sub = (char *)afs_init_sysname; 530 } else { 531 ret = -ENOMEM; 532 sub = kmemdup(s, len + 1, GFP_KERNEL); 533 if (!sub) 534 goto out; 535 } 536 537 sysnames->subs[sysnames->nr] = sub; 538 sysnames->nr++; 539 } 540 541 if (sysnames->nr == 0) { 542 sysnames->subs[0] = sysnames->blank; 543 sysnames->nr++; 544 } 545 546 write_lock(&net->sysnames_lock); 547 kill = net->sysnames; 548 net->sysnames = sysnames; 549 write_unlock(&net->sysnames_lock); 550 ret = 0; 551 out: 552 afs_put_sysnames(kill); 553 return ret; 554 555 invalid: 556 ret = -EINVAL; 557 error: 558 goto out; 559 } 560 561 void afs_put_sysnames(struct afs_sysnames *sysnames) 562 { 563 int i; 564 565 if (sysnames && refcount_dec_and_test(&sysnames->usage)) { 566 for (i = 0; i < sysnames->nr; i++) 567 if (sysnames->subs[i] != afs_init_sysname && 568 sysnames->subs[i] != sysnames->blank) 569 kfree(sysnames->subs[i]); 570 kfree(sysnames); 571 } 572 } 573 574 /* 575 * Display general per-net namespace statistics 576 */ 577 static int afs_proc_stats_show(struct seq_file *m, void *v) 578 { 579 struct afs_net *net = afs_seq2net_single(m); 580 581 seq_puts(m, "kAFS statistics\n"); 582 583 seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n", 584 atomic_read(&net->n_lookup), 585 atomic_read(&net->n_reval), 586 atomic_read(&net->n_inval), 587 atomic_read(&net->n_relpg)); 588 589 seq_printf(m, "dir-data: rdpg=%u\n", 590 atomic_read(&net->n_read_dir)); 591 592 seq_printf(m, "dir-edit: cr=%u rm=%u\n", 593 atomic_read(&net->n_dir_cr), 594 atomic_read(&net->n_dir_rm)); 595 596 seq_printf(m, "file-rd : n=%u nb=%lu\n", 597 atomic_read(&net->n_fetches), 598 atomic_long_read(&net->n_fetch_bytes)); 599 seq_printf(m, "file-wr : n=%u nb=%lu\n", 600 atomic_read(&net->n_stores), 601 atomic_long_read(&net->n_store_bytes)); 602 return 0; 603 } 604 605 /* 606 * initialise /proc/fs/afs/<cell>/ 607 */ 608 int afs_proc_cell_setup(struct afs_cell *cell) 609 { 610 struct proc_dir_entry *dir; 611 struct afs_net *net = cell->net; 612 613 _enter("%p{%s},%p", cell, cell->name, net->proc_afs); 614 615 dir = proc_net_mkdir(net->net, cell->name, net->proc_afs); 616 if (!dir) 617 goto error_dir; 618 619 if (!proc_create_net_data("vlservers", 0444, dir, 620 &afs_proc_cell_vlservers_ops, 621 sizeof(struct afs_vl_seq_net_private), 622 cell) || 623 !proc_create_net_data("volumes", 0444, dir, 624 &afs_proc_cell_volumes_ops, 625 sizeof(struct seq_net_private), 626 cell)) 627 goto error_tree; 628 629 _leave(" = 0"); 630 return 0; 631 632 error_tree: 633 remove_proc_subtree(cell->name, net->proc_afs); 634 error_dir: 635 _leave(" = -ENOMEM"); 636 return -ENOMEM; 637 } 638 639 /* 640 * remove /proc/fs/afs/<cell>/ 641 */ 642 void afs_proc_cell_remove(struct afs_cell *cell) 643 { 644 struct afs_net *net = cell->net; 645 646 _enter(""); 647 remove_proc_subtree(cell->name, net->proc_afs); 648 _leave(""); 649 } 650 651 /* 652 * initialise the /proc/fs/afs/ directory 653 */ 654 int afs_proc_init(struct afs_net *net) 655 { 656 struct proc_dir_entry *p; 657 658 _enter(""); 659 660 p = proc_net_mkdir(net->net, "afs", net->net->proc_net); 661 if (!p) 662 goto error_dir; 663 664 if (!proc_create_net_data_write("cells", 0644, p, 665 &afs_proc_cells_ops, 666 afs_proc_cells_write, 667 sizeof(struct seq_net_private), 668 NULL) || 669 !proc_create_net_single_write("rootcell", 0644, p, 670 afs_proc_rootcell_show, 671 afs_proc_rootcell_write, 672 NULL) || 673 !proc_create_net("servers", 0444, p, &afs_proc_servers_ops, 674 sizeof(struct seq_net_private)) || 675 !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) || 676 !proc_create_net_data_write("sysname", 0644, p, 677 &afs_proc_sysname_ops, 678 afs_proc_sysname_write, 679 sizeof(struct seq_net_private), 680 NULL)) 681 goto error_tree; 682 683 net->proc_afs = p; 684 _leave(" = 0"); 685 return 0; 686 687 error_tree: 688 proc_remove(p); 689 error_dir: 690 _leave(" = -ENOMEM"); 691 return -ENOMEM; 692 } 693 694 /* 695 * clean up the /proc/fs/afs/ directory 696 */ 697 void afs_proc_cleanup(struct afs_net *net) 698 { 699 proc_remove(net->proc_afs); 700 net->proc_afs = NULL; 701 } 702