1 #define MSNFS /* HACK HACK */ 2 /* 3 * NFS exporting and validation. 4 * 5 * We maintain a list of clients, each of which has a list of 6 * exports. To export an fs to a given client, you first have 7 * to create the client entry with NFSCTL_ADDCLIENT, which 8 * creates a client control block and adds it to the hash 9 * table. Then, you call NFSCTL_EXPORT for each fs. 10 * 11 * 12 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de> 13 */ 14 15 #include <linux/slab.h> 16 #include <linux/namei.h> 17 #include <linux/module.h> 18 #include <linux/exportfs.h> 19 20 #include <linux/nfsd/syscall.h> 21 #include <net/ipv6.h> 22 23 #include "nfsd.h" 24 #include "nfsfh.h" 25 26 #define NFSDDBG_FACILITY NFSDDBG_EXPORT 27 28 typedef struct auth_domain svc_client; 29 typedef struct svc_export svc_export; 30 31 /* 32 * We have two caches. 33 * One maps client+vfsmnt+dentry to export options - the export map 34 * The other maps client+filehandle-fragment to export options. - the expkey map 35 * 36 * The export options are actually stored in the first map, and the 37 * second map contains a reference to the entry in the first map. 38 */ 39 40 #define EXPKEY_HASHBITS 8 41 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) 42 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) 43 static struct cache_head *expkey_table[EXPKEY_HASHMAX]; 44 45 static void expkey_put(struct kref *ref) 46 { 47 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); 48 49 if (test_bit(CACHE_VALID, &key->h.flags) && 50 !test_bit(CACHE_NEGATIVE, &key->h.flags)) 51 path_put(&key->ek_path); 52 auth_domain_put(key->ek_client); 53 kfree(key); 54 } 55 56 static void expkey_request(struct cache_detail *cd, 57 struct cache_head *h, 58 char **bpp, int *blen) 59 { 60 /* client fsidtype \xfsid */ 61 struct svc_expkey *ek = container_of(h, struct svc_expkey, h); 62 char type[5]; 63 64 qword_add(bpp, blen, ek->ek_client->name); 65 snprintf(type, 5, "%d", ek->ek_fsidtype); 66 qword_add(bpp, blen, type); 67 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); 68 (*bpp)[-1] = '\n'; 69 } 70 71 static int expkey_upcall(struct cache_detail *cd, struct cache_head *h) 72 { 73 return sunrpc_cache_pipe_upcall(cd, h, expkey_request); 74 } 75 76 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); 77 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); 78 static struct cache_detail svc_expkey_cache; 79 80 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) 81 { 82 /* client fsidtype fsid [path] */ 83 char *buf; 84 int len; 85 struct auth_domain *dom = NULL; 86 int err; 87 int fsidtype; 88 char *ep; 89 struct svc_expkey key; 90 struct svc_expkey *ek = NULL; 91 92 if (mesg[mlen-1] != '\n') 93 return -EINVAL; 94 mesg[mlen-1] = 0; 95 96 buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 97 err = -ENOMEM; 98 if (!buf) 99 goto out; 100 101 err = -EINVAL; 102 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) 103 goto out; 104 105 err = -ENOENT; 106 dom = auth_domain_find(buf); 107 if (!dom) 108 goto out; 109 dprintk("found domain %s\n", buf); 110 111 err = -EINVAL; 112 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) 113 goto out; 114 fsidtype = simple_strtoul(buf, &ep, 10); 115 if (*ep) 116 goto out; 117 dprintk("found fsidtype %d\n", fsidtype); 118 if (key_len(fsidtype)==0) /* invalid type */ 119 goto out; 120 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) 121 goto out; 122 dprintk("found fsid length %d\n", len); 123 if (len != key_len(fsidtype)) 124 goto out; 125 126 /* OK, we seem to have a valid key */ 127 key.h.flags = 0; 128 key.h.expiry_time = get_expiry(&mesg); 129 if (key.h.expiry_time == 0) 130 goto out; 131 132 key.ek_client = dom; 133 key.ek_fsidtype = fsidtype; 134 memcpy(key.ek_fsid, buf, len); 135 136 ek = svc_expkey_lookup(&key); 137 err = -ENOMEM; 138 if (!ek) 139 goto out; 140 141 /* now we want a pathname, or empty meaning NEGATIVE */ 142 err = -EINVAL; 143 len = qword_get(&mesg, buf, PAGE_SIZE); 144 if (len < 0) 145 goto out; 146 dprintk("Path seems to be <%s>\n", buf); 147 err = 0; 148 if (len == 0) { 149 set_bit(CACHE_NEGATIVE, &key.h.flags); 150 ek = svc_expkey_update(&key, ek); 151 if (!ek) 152 err = -ENOMEM; 153 } else { 154 err = kern_path(buf, 0, &key.ek_path); 155 if (err) 156 goto out; 157 158 dprintk("Found the path %s\n", buf); 159 160 ek = svc_expkey_update(&key, ek); 161 if (!ek) 162 err = -ENOMEM; 163 path_put(&key.ek_path); 164 } 165 cache_flush(); 166 out: 167 if (ek) 168 cache_put(&ek->h, &svc_expkey_cache); 169 if (dom) 170 auth_domain_put(dom); 171 kfree(buf); 172 return err; 173 } 174 175 static int expkey_show(struct seq_file *m, 176 struct cache_detail *cd, 177 struct cache_head *h) 178 { 179 struct svc_expkey *ek ; 180 int i; 181 182 if (h ==NULL) { 183 seq_puts(m, "#domain fsidtype fsid [path]\n"); 184 return 0; 185 } 186 ek = container_of(h, struct svc_expkey, h); 187 seq_printf(m, "%s %d 0x", ek->ek_client->name, 188 ek->ek_fsidtype); 189 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) 190 seq_printf(m, "%08x", ek->ek_fsid[i]); 191 if (test_bit(CACHE_VALID, &h->flags) && 192 !test_bit(CACHE_NEGATIVE, &h->flags)) { 193 seq_printf(m, " "); 194 seq_path(m, &ek->ek_path, "\\ \t\n"); 195 } 196 seq_printf(m, "\n"); 197 return 0; 198 } 199 200 static inline int expkey_match (struct cache_head *a, struct cache_head *b) 201 { 202 struct svc_expkey *orig = container_of(a, struct svc_expkey, h); 203 struct svc_expkey *new = container_of(b, struct svc_expkey, h); 204 205 if (orig->ek_fsidtype != new->ek_fsidtype || 206 orig->ek_client != new->ek_client || 207 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) 208 return 0; 209 return 1; 210 } 211 212 static inline void expkey_init(struct cache_head *cnew, 213 struct cache_head *citem) 214 { 215 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); 216 struct svc_expkey *item = container_of(citem, struct svc_expkey, h); 217 218 kref_get(&item->ek_client->ref); 219 new->ek_client = item->ek_client; 220 new->ek_fsidtype = item->ek_fsidtype; 221 222 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); 223 } 224 225 static inline void expkey_update(struct cache_head *cnew, 226 struct cache_head *citem) 227 { 228 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); 229 struct svc_expkey *item = container_of(citem, struct svc_expkey, h); 230 231 new->ek_path = item->ek_path; 232 path_get(&item->ek_path); 233 } 234 235 static struct cache_head *expkey_alloc(void) 236 { 237 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); 238 if (i) 239 return &i->h; 240 else 241 return NULL; 242 } 243 244 static struct cache_detail svc_expkey_cache = { 245 .owner = THIS_MODULE, 246 .hash_size = EXPKEY_HASHMAX, 247 .hash_table = expkey_table, 248 .name = "nfsd.fh", 249 .cache_put = expkey_put, 250 .cache_upcall = expkey_upcall, 251 .cache_parse = expkey_parse, 252 .cache_show = expkey_show, 253 .match = expkey_match, 254 .init = expkey_init, 255 .update = expkey_update, 256 .alloc = expkey_alloc, 257 }; 258 259 static int 260 svc_expkey_hash(struct svc_expkey *item) 261 { 262 int hash = item->ek_fsidtype; 263 char * cp = (char*)item->ek_fsid; 264 int len = key_len(item->ek_fsidtype); 265 266 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); 267 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); 268 hash &= EXPKEY_HASHMASK; 269 return hash; 270 } 271 272 static struct svc_expkey * 273 svc_expkey_lookup(struct svc_expkey *item) 274 { 275 struct cache_head *ch; 276 int hash = svc_expkey_hash(item); 277 278 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, 279 hash); 280 if (ch) 281 return container_of(ch, struct svc_expkey, h); 282 else 283 return NULL; 284 } 285 286 static struct svc_expkey * 287 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) 288 { 289 struct cache_head *ch; 290 int hash = svc_expkey_hash(new); 291 292 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, 293 &old->h, hash); 294 if (ch) 295 return container_of(ch, struct svc_expkey, h); 296 else 297 return NULL; 298 } 299 300 301 #define EXPORT_HASHBITS 8 302 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) 303 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) 304 305 static struct cache_head *export_table[EXPORT_HASHMAX]; 306 307 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) 308 { 309 int i; 310 311 for (i = 0; i < fsloc->locations_count; i++) { 312 kfree(fsloc->locations[i].path); 313 kfree(fsloc->locations[i].hosts); 314 } 315 kfree(fsloc->locations); 316 } 317 318 static void svc_export_put(struct kref *ref) 319 { 320 struct svc_export *exp = container_of(ref, struct svc_export, h.ref); 321 path_put(&exp->ex_path); 322 auth_domain_put(exp->ex_client); 323 kfree(exp->ex_pathname); 324 nfsd4_fslocs_free(&exp->ex_fslocs); 325 kfree(exp); 326 } 327 328 static void svc_export_request(struct cache_detail *cd, 329 struct cache_head *h, 330 char **bpp, int *blen) 331 { 332 /* client path */ 333 struct svc_export *exp = container_of(h, struct svc_export, h); 334 char *pth; 335 336 qword_add(bpp, blen, exp->ex_client->name); 337 pth = d_path(&exp->ex_path, *bpp, *blen); 338 if (IS_ERR(pth)) { 339 /* is this correct? */ 340 (*bpp)[0] = '\n'; 341 return; 342 } 343 qword_add(bpp, blen, pth); 344 (*bpp)[-1] = '\n'; 345 } 346 347 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h) 348 { 349 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request); 350 } 351 352 static struct svc_export *svc_export_update(struct svc_export *new, 353 struct svc_export *old); 354 static struct svc_export *svc_export_lookup(struct svc_export *); 355 356 static int check_export(struct inode *inode, int *flags, unsigned char *uuid) 357 { 358 359 /* 360 * We currently export only dirs, regular files, and (for v4 361 * pseudoroot) symlinks. 362 */ 363 if (!S_ISDIR(inode->i_mode) && 364 !S_ISLNK(inode->i_mode) && 365 !S_ISREG(inode->i_mode)) 366 return -ENOTDIR; 367 368 /* 369 * Mountd should never pass down a writeable V4ROOT export, but, 370 * just to make sure: 371 */ 372 if (*flags & NFSEXP_V4ROOT) 373 *flags |= NFSEXP_READONLY; 374 375 /* There are two requirements on a filesystem to be exportable. 376 * 1: We must be able to identify the filesystem from a number. 377 * either a device number (so FS_REQUIRES_DEV needed) 378 * or an FSID number (so NFSEXP_FSID or ->uuid is needed). 379 * 2: We must be able to find an inode from a filehandle. 380 * This means that s_export_op must be set. 381 */ 382 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && 383 !(*flags & NFSEXP_FSID) && 384 uuid == NULL) { 385 dprintk("exp_export: export of non-dev fs without fsid\n"); 386 return -EINVAL; 387 } 388 389 if (!inode->i_sb->s_export_op || 390 !inode->i_sb->s_export_op->fh_to_dentry) { 391 dprintk("exp_export: export of invalid fs type.\n"); 392 return -EINVAL; 393 } 394 395 return 0; 396 397 } 398 399 #ifdef CONFIG_NFSD_V4 400 401 static int 402 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) 403 { 404 int len; 405 int migrated, i, err; 406 407 /* listsize */ 408 err = get_int(mesg, &fsloc->locations_count); 409 if (err) 410 return err; 411 if (fsloc->locations_count > MAX_FS_LOCATIONS) 412 return -EINVAL; 413 if (fsloc->locations_count == 0) 414 return 0; 415 416 fsloc->locations = kzalloc(fsloc->locations_count 417 * sizeof(struct nfsd4_fs_location), GFP_KERNEL); 418 if (!fsloc->locations) 419 return -ENOMEM; 420 for (i=0; i < fsloc->locations_count; i++) { 421 /* colon separated host list */ 422 err = -EINVAL; 423 len = qword_get(mesg, buf, PAGE_SIZE); 424 if (len <= 0) 425 goto out_free_all; 426 err = -ENOMEM; 427 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); 428 if (!fsloc->locations[i].hosts) 429 goto out_free_all; 430 err = -EINVAL; 431 /* slash separated path component list */ 432 len = qword_get(mesg, buf, PAGE_SIZE); 433 if (len <= 0) 434 goto out_free_all; 435 err = -ENOMEM; 436 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); 437 if (!fsloc->locations[i].path) 438 goto out_free_all; 439 } 440 /* migrated */ 441 err = get_int(mesg, &migrated); 442 if (err) 443 goto out_free_all; 444 err = -EINVAL; 445 if (migrated < 0 || migrated > 1) 446 goto out_free_all; 447 fsloc->migrated = migrated; 448 return 0; 449 out_free_all: 450 nfsd4_fslocs_free(fsloc); 451 return err; 452 } 453 454 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) 455 { 456 int listsize, err; 457 struct exp_flavor_info *f; 458 459 err = get_int(mesg, &listsize); 460 if (err) 461 return err; 462 if (listsize < 0 || listsize > MAX_SECINFO_LIST) 463 return -EINVAL; 464 465 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { 466 err = get_int(mesg, &f->pseudoflavor); 467 if (err) 468 return err; 469 /* 470 * XXX: It would be nice to also check whether this 471 * pseudoflavor is supported, so we can discover the 472 * problem at export time instead of when a client fails 473 * to authenticate. 474 */ 475 err = get_int(mesg, &f->flags); 476 if (err) 477 return err; 478 /* Only some flags are allowed to differ between flavors: */ 479 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) 480 return -EINVAL; 481 } 482 exp->ex_nflavors = listsize; 483 return 0; 484 } 485 486 #else /* CONFIG_NFSD_V4 */ 487 static inline int 488 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} 489 static inline int 490 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } 491 #endif 492 493 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) 494 { 495 /* client path expiry [flags anonuid anongid fsid] */ 496 char *buf; 497 int len; 498 int err; 499 struct auth_domain *dom = NULL; 500 struct svc_export exp = {}, *expp; 501 int an_int; 502 503 if (mesg[mlen-1] != '\n') 504 return -EINVAL; 505 mesg[mlen-1] = 0; 506 507 buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 508 if (!buf) 509 return -ENOMEM; 510 511 /* client */ 512 err = -EINVAL; 513 len = qword_get(&mesg, buf, PAGE_SIZE); 514 if (len <= 0) 515 goto out; 516 517 err = -ENOENT; 518 dom = auth_domain_find(buf); 519 if (!dom) 520 goto out; 521 522 /* path */ 523 err = -EINVAL; 524 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0) 525 goto out1; 526 527 err = kern_path(buf, 0, &exp.ex_path); 528 if (err) 529 goto out1; 530 531 exp.ex_client = dom; 532 533 err = -ENOMEM; 534 exp.ex_pathname = kstrdup(buf, GFP_KERNEL); 535 if (!exp.ex_pathname) 536 goto out2; 537 538 /* expiry */ 539 err = -EINVAL; 540 exp.h.expiry_time = get_expiry(&mesg); 541 if (exp.h.expiry_time == 0) 542 goto out3; 543 544 /* flags */ 545 err = get_int(&mesg, &an_int); 546 if (err == -ENOENT) { 547 err = 0; 548 set_bit(CACHE_NEGATIVE, &exp.h.flags); 549 } else { 550 if (err || an_int < 0) 551 goto out3; 552 exp.ex_flags= an_int; 553 554 /* anon uid */ 555 err = get_int(&mesg, &an_int); 556 if (err) 557 goto out3; 558 exp.ex_anon_uid= an_int; 559 560 /* anon gid */ 561 err = get_int(&mesg, &an_int); 562 if (err) 563 goto out3; 564 exp.ex_anon_gid= an_int; 565 566 /* fsid */ 567 err = get_int(&mesg, &an_int); 568 if (err) 569 goto out3; 570 exp.ex_fsid = an_int; 571 572 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { 573 if (strcmp(buf, "fsloc") == 0) 574 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); 575 else if (strcmp(buf, "uuid") == 0) { 576 /* expect a 16 byte uuid encoded as \xXXXX... */ 577 len = qword_get(&mesg, buf, PAGE_SIZE); 578 if (len != 16) 579 err = -EINVAL; 580 else { 581 exp.ex_uuid = 582 kmemdup(buf, 16, GFP_KERNEL); 583 if (exp.ex_uuid == NULL) 584 err = -ENOMEM; 585 } 586 } else if (strcmp(buf, "secinfo") == 0) 587 err = secinfo_parse(&mesg, buf, &exp); 588 else 589 /* quietly ignore unknown words and anything 590 * following. Newer user-space can try to set 591 * new values, then see what the result was. 592 */ 593 break; 594 if (err) 595 goto out4; 596 } 597 598 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags, 599 exp.ex_uuid); 600 if (err) 601 goto out4; 602 } 603 604 expp = svc_export_lookup(&exp); 605 if (expp) 606 expp = svc_export_update(&exp, expp); 607 else 608 err = -ENOMEM; 609 cache_flush(); 610 if (expp == NULL) 611 err = -ENOMEM; 612 else 613 exp_put(expp); 614 out4: 615 nfsd4_fslocs_free(&exp.ex_fslocs); 616 kfree(exp.ex_uuid); 617 out3: 618 kfree(exp.ex_pathname); 619 out2: 620 path_put(&exp.ex_path); 621 out1: 622 auth_domain_put(dom); 623 out: 624 kfree(buf); 625 return err; 626 } 627 628 static void exp_flags(struct seq_file *m, int flag, int fsid, 629 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs); 630 static void show_secinfo(struct seq_file *m, struct svc_export *exp); 631 632 static int svc_export_show(struct seq_file *m, 633 struct cache_detail *cd, 634 struct cache_head *h) 635 { 636 struct svc_export *exp ; 637 638 if (h ==NULL) { 639 seq_puts(m, "#path domain(flags)\n"); 640 return 0; 641 } 642 exp = container_of(h, struct svc_export, h); 643 seq_path(m, &exp->ex_path, " \t\n\\"); 644 seq_putc(m, '\t'); 645 seq_escape(m, exp->ex_client->name, " \t\n\\"); 646 seq_putc(m, '('); 647 if (test_bit(CACHE_VALID, &h->flags) && 648 !test_bit(CACHE_NEGATIVE, &h->flags)) { 649 exp_flags(m, exp->ex_flags, exp->ex_fsid, 650 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); 651 if (exp->ex_uuid) { 652 int i; 653 seq_puts(m, ",uuid="); 654 for (i=0; i<16; i++) { 655 if ((i&3) == 0 && i) 656 seq_putc(m, ':'); 657 seq_printf(m, "%02x", exp->ex_uuid[i]); 658 } 659 } 660 show_secinfo(m, exp); 661 } 662 seq_puts(m, ")\n"); 663 return 0; 664 } 665 static int svc_export_match(struct cache_head *a, struct cache_head *b) 666 { 667 struct svc_export *orig = container_of(a, struct svc_export, h); 668 struct svc_export *new = container_of(b, struct svc_export, h); 669 return orig->ex_client == new->ex_client && 670 orig->ex_path.dentry == new->ex_path.dentry && 671 orig->ex_path.mnt == new->ex_path.mnt; 672 } 673 674 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) 675 { 676 struct svc_export *new = container_of(cnew, struct svc_export, h); 677 struct svc_export *item = container_of(citem, struct svc_export, h); 678 679 kref_get(&item->ex_client->ref); 680 new->ex_client = item->ex_client; 681 new->ex_path.dentry = dget(item->ex_path.dentry); 682 new->ex_path.mnt = mntget(item->ex_path.mnt); 683 new->ex_pathname = NULL; 684 new->ex_fslocs.locations = NULL; 685 new->ex_fslocs.locations_count = 0; 686 new->ex_fslocs.migrated = 0; 687 } 688 689 static void export_update(struct cache_head *cnew, struct cache_head *citem) 690 { 691 struct svc_export *new = container_of(cnew, struct svc_export, h); 692 struct svc_export *item = container_of(citem, struct svc_export, h); 693 int i; 694 695 new->ex_flags = item->ex_flags; 696 new->ex_anon_uid = item->ex_anon_uid; 697 new->ex_anon_gid = item->ex_anon_gid; 698 new->ex_fsid = item->ex_fsid; 699 new->ex_uuid = item->ex_uuid; 700 item->ex_uuid = NULL; 701 new->ex_pathname = item->ex_pathname; 702 item->ex_pathname = NULL; 703 new->ex_fslocs.locations = item->ex_fslocs.locations; 704 item->ex_fslocs.locations = NULL; 705 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; 706 item->ex_fslocs.locations_count = 0; 707 new->ex_fslocs.migrated = item->ex_fslocs.migrated; 708 item->ex_fslocs.migrated = 0; 709 new->ex_nflavors = item->ex_nflavors; 710 for (i = 0; i < MAX_SECINFO_LIST; i++) { 711 new->ex_flavors[i] = item->ex_flavors[i]; 712 } 713 } 714 715 static struct cache_head *svc_export_alloc(void) 716 { 717 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); 718 if (i) 719 return &i->h; 720 else 721 return NULL; 722 } 723 724 struct cache_detail svc_export_cache = { 725 .owner = THIS_MODULE, 726 .hash_size = EXPORT_HASHMAX, 727 .hash_table = export_table, 728 .name = "nfsd.export", 729 .cache_put = svc_export_put, 730 .cache_upcall = svc_export_upcall, 731 .cache_parse = svc_export_parse, 732 .cache_show = svc_export_show, 733 .match = svc_export_match, 734 .init = svc_export_init, 735 .update = export_update, 736 .alloc = svc_export_alloc, 737 }; 738 739 static int 740 svc_export_hash(struct svc_export *exp) 741 { 742 int hash; 743 744 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); 745 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS); 746 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS); 747 return hash; 748 } 749 750 static struct svc_export * 751 svc_export_lookup(struct svc_export *exp) 752 { 753 struct cache_head *ch; 754 int hash = svc_export_hash(exp); 755 756 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, 757 hash); 758 if (ch) 759 return container_of(ch, struct svc_export, h); 760 else 761 return NULL; 762 } 763 764 static struct svc_export * 765 svc_export_update(struct svc_export *new, struct svc_export *old) 766 { 767 struct cache_head *ch; 768 int hash = svc_export_hash(old); 769 770 ch = sunrpc_cache_update(&svc_export_cache, &new->h, 771 &old->h, 772 hash); 773 if (ch) 774 return container_of(ch, struct svc_export, h); 775 else 776 return NULL; 777 } 778 779 780 static struct svc_expkey * 781 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) 782 { 783 struct svc_expkey key, *ek; 784 int err; 785 786 if (!clp) 787 return ERR_PTR(-ENOENT); 788 789 key.ek_client = clp; 790 key.ek_fsidtype = fsid_type; 791 memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); 792 793 ek = svc_expkey_lookup(&key); 794 if (ek == NULL) 795 return ERR_PTR(-ENOMEM); 796 err = cache_check(&svc_expkey_cache, &ek->h, reqp); 797 if (err) 798 return ERR_PTR(err); 799 return ek; 800 } 801 802 #ifdef CONFIG_NFSD_DEPRECATED 803 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, 804 struct svc_export *exp) 805 { 806 struct svc_expkey key, *ek; 807 808 key.ek_client = clp; 809 key.ek_fsidtype = fsid_type; 810 memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); 811 key.ek_path = exp->ex_path; 812 key.h.expiry_time = NEVER; 813 key.h.flags = 0; 814 815 ek = svc_expkey_lookup(&key); 816 if (ek) 817 ek = svc_expkey_update(&key,ek); 818 if (ek) { 819 cache_put(&ek->h, &svc_expkey_cache); 820 return 0; 821 } 822 return -ENOMEM; 823 } 824 825 /* 826 * Find the client's export entry matching xdev/xino. 827 */ 828 static inline struct svc_expkey * 829 exp_get_key(svc_client *clp, dev_t dev, ino_t ino) 830 { 831 u32 fsidv[3]; 832 833 if (old_valid_dev(dev)) { 834 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL); 835 return exp_find_key(clp, FSID_DEV, fsidv, NULL); 836 } 837 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL); 838 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL); 839 } 840 841 /* 842 * Find the client's export entry matching fsid 843 */ 844 static inline struct svc_expkey * 845 exp_get_fsid_key(svc_client *clp, int fsid) 846 { 847 u32 fsidv[2]; 848 849 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL); 850 851 return exp_find_key(clp, FSID_NUM, fsidv, NULL); 852 } 853 #endif 854 855 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path, 856 struct cache_req *reqp) 857 { 858 struct svc_export *exp, key; 859 int err; 860 861 if (!clp) 862 return ERR_PTR(-ENOENT); 863 864 key.ex_client = clp; 865 key.ex_path = *path; 866 867 exp = svc_export_lookup(&key); 868 if (exp == NULL) 869 return ERR_PTR(-ENOMEM); 870 err = cache_check(&svc_export_cache, &exp->h, reqp); 871 if (err) 872 return ERR_PTR(err); 873 return exp; 874 } 875 876 /* 877 * Find the export entry for a given dentry. 878 */ 879 static struct svc_export *exp_parent(svc_client *clp, struct path *path) 880 { 881 struct dentry *saved = dget(path->dentry); 882 svc_export *exp = exp_get_by_name(clp, path, NULL); 883 884 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { 885 struct dentry *parent = dget_parent(path->dentry); 886 dput(path->dentry); 887 path->dentry = parent; 888 exp = exp_get_by_name(clp, path, NULL); 889 } 890 dput(path->dentry); 891 path->dentry = saved; 892 return exp; 893 } 894 895 #ifdef CONFIG_NFSD_DEPRECATED 896 /* 897 * Hashtable locking. Write locks are placed only by user processes 898 * wanting to modify export information. 899 * Write locking only done in this file. Read locking 900 * needed externally. 901 */ 902 903 static DECLARE_RWSEM(hash_sem); 904 905 void 906 exp_readlock(void) 907 { 908 down_read(&hash_sem); 909 } 910 911 static inline void 912 exp_writelock(void) 913 { 914 down_write(&hash_sem); 915 } 916 917 void 918 exp_readunlock(void) 919 { 920 up_read(&hash_sem); 921 } 922 923 static inline void 924 exp_writeunlock(void) 925 { 926 up_write(&hash_sem); 927 } 928 #else 929 930 /* hash_sem not needed once deprecated interface is removed */ 931 void exp_readlock(void) {} 932 static inline void exp_writelock(void){} 933 void exp_readunlock(void) {} 934 static inline void exp_writeunlock(void){} 935 936 #endif 937 938 #ifdef CONFIG_NFSD_DEPRECATED 939 static void exp_do_unexport(svc_export *unexp); 940 static int exp_verify_string(char *cp, int max); 941 942 static void exp_fsid_unhash(struct svc_export *exp) 943 { 944 struct svc_expkey *ek; 945 946 if ((exp->ex_flags & NFSEXP_FSID) == 0) 947 return; 948 949 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); 950 if (!IS_ERR(ek)) { 951 sunrpc_invalidate(&ek->h, &svc_expkey_cache); 952 cache_put(&ek->h, &svc_expkey_cache); 953 } 954 } 955 956 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) 957 { 958 u32 fsid[2]; 959 960 if ((exp->ex_flags & NFSEXP_FSID) == 0) 961 return 0; 962 963 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL); 964 return exp_set_key(clp, FSID_NUM, fsid, exp); 965 } 966 967 static int exp_hash(struct auth_domain *clp, struct svc_export *exp) 968 { 969 u32 fsid[2]; 970 struct inode *inode = exp->ex_path.dentry->d_inode; 971 dev_t dev = inode->i_sb->s_dev; 972 973 if (old_valid_dev(dev)) { 974 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL); 975 return exp_set_key(clp, FSID_DEV, fsid, exp); 976 } 977 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL); 978 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp); 979 } 980 981 static void exp_unhash(struct svc_export *exp) 982 { 983 struct svc_expkey *ek; 984 struct inode *inode = exp->ex_path.dentry->d_inode; 985 986 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); 987 if (!IS_ERR(ek)) { 988 sunrpc_invalidate(&ek->h, &svc_expkey_cache); 989 cache_put(&ek->h, &svc_expkey_cache); 990 } 991 } 992 993 /* 994 * Export a file system. 995 */ 996 int 997 exp_export(struct nfsctl_export *nxp) 998 { 999 svc_client *clp; 1000 struct svc_export *exp = NULL; 1001 struct svc_export new; 1002 struct svc_expkey *fsid_key = NULL; 1003 struct path path; 1004 int err; 1005 1006 /* Consistency check */ 1007 err = -EINVAL; 1008 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || 1009 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) 1010 goto out; 1011 1012 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", 1013 nxp->ex_client, nxp->ex_path, 1014 (unsigned)nxp->ex_dev, (long)nxp->ex_ino, 1015 nxp->ex_flags); 1016 1017 /* Try to lock the export table for update */ 1018 exp_writelock(); 1019 1020 /* Look up client info */ 1021 if (!(clp = auth_domain_find(nxp->ex_client))) 1022 goto out_unlock; 1023 1024 1025 /* Look up the dentry */ 1026 err = kern_path(nxp->ex_path, 0, &path); 1027 if (err) 1028 goto out_put_clp; 1029 err = -EINVAL; 1030 1031 exp = exp_get_by_name(clp, &path, NULL); 1032 1033 memset(&new, 0, sizeof(new)); 1034 1035 /* must make sure there won't be an ex_fsid clash */ 1036 if ((nxp->ex_flags & NFSEXP_FSID) && 1037 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) && 1038 fsid_key->ek_path.mnt && 1039 (fsid_key->ek_path.mnt != path.mnt || 1040 fsid_key->ek_path.dentry != path.dentry)) 1041 goto finish; 1042 1043 if (!IS_ERR(exp)) { 1044 /* just a flags/id/fsid update */ 1045 1046 exp_fsid_unhash(exp); 1047 exp->ex_flags = nxp->ex_flags; 1048 exp->ex_anon_uid = nxp->ex_anon_uid; 1049 exp->ex_anon_gid = nxp->ex_anon_gid; 1050 exp->ex_fsid = nxp->ex_dev; 1051 1052 err = exp_fsid_hash(clp, exp); 1053 goto finish; 1054 } 1055 1056 err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL); 1057 if (err) goto finish; 1058 1059 err = -ENOMEM; 1060 1061 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); 1062 1063 new.h.expiry_time = NEVER; 1064 new.h.flags = 0; 1065 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL); 1066 if (!new.ex_pathname) 1067 goto finish; 1068 new.ex_client = clp; 1069 new.ex_path = path; 1070 new.ex_flags = nxp->ex_flags; 1071 new.ex_anon_uid = nxp->ex_anon_uid; 1072 new.ex_anon_gid = nxp->ex_anon_gid; 1073 new.ex_fsid = nxp->ex_dev; 1074 1075 exp = svc_export_lookup(&new); 1076 if (exp) 1077 exp = svc_export_update(&new, exp); 1078 1079 if (!exp) 1080 goto finish; 1081 1082 if (exp_hash(clp, exp) || 1083 exp_fsid_hash(clp, exp)) { 1084 /* failed to create at least one index */ 1085 exp_do_unexport(exp); 1086 cache_flush(); 1087 } else 1088 err = 0; 1089 finish: 1090 kfree(new.ex_pathname); 1091 if (!IS_ERR_OR_NULL(exp)) 1092 exp_put(exp); 1093 if (!IS_ERR_OR_NULL(fsid_key)) 1094 cache_put(&fsid_key->h, &svc_expkey_cache); 1095 path_put(&path); 1096 out_put_clp: 1097 auth_domain_put(clp); 1098 out_unlock: 1099 exp_writeunlock(); 1100 out: 1101 return err; 1102 } 1103 1104 /* 1105 * Unexport a file system. The export entry has already 1106 * been removed from the client's list of exported fs's. 1107 */ 1108 static void 1109 exp_do_unexport(svc_export *unexp) 1110 { 1111 sunrpc_invalidate(&unexp->h, &svc_export_cache); 1112 exp_unhash(unexp); 1113 exp_fsid_unhash(unexp); 1114 } 1115 1116 1117 /* 1118 * unexport syscall. 1119 */ 1120 int 1121 exp_unexport(struct nfsctl_export *nxp) 1122 { 1123 struct auth_domain *dom; 1124 svc_export *exp; 1125 struct path path; 1126 int err; 1127 1128 /* Consistency check */ 1129 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || 1130 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) 1131 return -EINVAL; 1132 1133 exp_writelock(); 1134 1135 err = -EINVAL; 1136 dom = auth_domain_find(nxp->ex_client); 1137 if (!dom) { 1138 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); 1139 goto out_unlock; 1140 } 1141 1142 err = kern_path(nxp->ex_path, 0, &path); 1143 if (err) 1144 goto out_domain; 1145 1146 err = -EINVAL; 1147 exp = exp_get_by_name(dom, &path, NULL); 1148 path_put(&path); 1149 if (IS_ERR(exp)) 1150 goto out_domain; 1151 1152 exp_do_unexport(exp); 1153 exp_put(exp); 1154 err = 0; 1155 1156 out_domain: 1157 auth_domain_put(dom); 1158 cache_flush(); 1159 out_unlock: 1160 exp_writeunlock(); 1161 return err; 1162 } 1163 #endif /* CONFIG_NFSD_DEPRECATED */ 1164 1165 /* 1166 * Obtain the root fh on behalf of a client. 1167 * This could be done in user space, but I feel that it adds some safety 1168 * since its harder to fool a kernel module than a user space program. 1169 */ 1170 int 1171 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize) 1172 { 1173 struct svc_export *exp; 1174 struct path path; 1175 struct inode *inode; 1176 struct svc_fh fh; 1177 int err; 1178 1179 err = -EPERM; 1180 /* NB: we probably ought to check that it's NUL-terminated */ 1181 if (kern_path(name, 0, &path)) { 1182 printk("nfsd: exp_rootfh path not found %s", name); 1183 return err; 1184 } 1185 inode = path.dentry->d_inode; 1186 1187 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", 1188 name, path.dentry, clp->name, 1189 inode->i_sb->s_id, inode->i_ino); 1190 exp = exp_parent(clp, &path); 1191 if (IS_ERR(exp)) { 1192 err = PTR_ERR(exp); 1193 goto out; 1194 } 1195 1196 /* 1197 * fh must be initialized before calling fh_compose 1198 */ 1199 fh_init(&fh, maxsize); 1200 if (fh_compose(&fh, exp, path.dentry, NULL)) 1201 err = -EINVAL; 1202 else 1203 err = 0; 1204 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); 1205 fh_put(&fh); 1206 exp_put(exp); 1207 out: 1208 path_put(&path); 1209 return err; 1210 } 1211 1212 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type, 1213 u32 *fsidv, struct cache_req *reqp) 1214 { 1215 struct svc_export *exp; 1216 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); 1217 if (IS_ERR(ek)) 1218 return ERR_CAST(ek); 1219 1220 exp = exp_get_by_name(clp, &ek->ek_path, reqp); 1221 cache_put(&ek->h, &svc_expkey_cache); 1222 1223 if (IS_ERR(exp)) 1224 return ERR_CAST(exp); 1225 return exp; 1226 } 1227 1228 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) 1229 { 1230 struct exp_flavor_info *f; 1231 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; 1232 1233 /* legacy gss-only clients are always OK: */ 1234 if (exp->ex_client == rqstp->rq_gssclient) 1235 return 0; 1236 /* ip-address based client; check sec= export option: */ 1237 for (f = exp->ex_flavors; f < end; f++) { 1238 if (f->pseudoflavor == rqstp->rq_flavor) 1239 return 0; 1240 } 1241 /* defaults in absence of sec= options: */ 1242 if (exp->ex_nflavors == 0) { 1243 if (rqstp->rq_flavor == RPC_AUTH_NULL || 1244 rqstp->rq_flavor == RPC_AUTH_UNIX) 1245 return 0; 1246 } 1247 return nfserr_wrongsec; 1248 } 1249 1250 /* 1251 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an 1252 * auth_unix client) if it's available and has secinfo information; 1253 * otherwise, will try to use rq_gssclient. 1254 * 1255 * Called from functions that handle requests; functions that do work on 1256 * behalf of mountd are passed a single client name to use, and should 1257 * use exp_get_by_name() or exp_find(). 1258 */ 1259 struct svc_export * 1260 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) 1261 { 1262 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); 1263 1264 if (rqstp->rq_client == NULL) 1265 goto gss; 1266 1267 /* First try the auth_unix client: */ 1268 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle); 1269 if (PTR_ERR(exp) == -ENOENT) 1270 goto gss; 1271 if (IS_ERR(exp)) 1272 return exp; 1273 /* If it has secinfo, assume there are no gss/... clients */ 1274 if (exp->ex_nflavors > 0) 1275 return exp; 1276 gss: 1277 /* Otherwise, try falling back on gss client */ 1278 if (rqstp->rq_gssclient == NULL) 1279 return exp; 1280 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle); 1281 if (PTR_ERR(gssexp) == -ENOENT) 1282 return exp; 1283 if (!IS_ERR(exp)) 1284 exp_put(exp); 1285 return gssexp; 1286 } 1287 1288 struct svc_export * 1289 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) 1290 { 1291 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); 1292 1293 if (rqstp->rq_client == NULL) 1294 goto gss; 1295 1296 /* First try the auth_unix client: */ 1297 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle); 1298 if (PTR_ERR(exp) == -ENOENT) 1299 goto gss; 1300 if (IS_ERR(exp)) 1301 return exp; 1302 /* If it has secinfo, assume there are no gss/... clients */ 1303 if (exp->ex_nflavors > 0) 1304 return exp; 1305 gss: 1306 /* Otherwise, try falling back on gss client */ 1307 if (rqstp->rq_gssclient == NULL) 1308 return exp; 1309 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv, 1310 &rqstp->rq_chandle); 1311 if (PTR_ERR(gssexp) == -ENOENT) 1312 return exp; 1313 if (!IS_ERR(exp)) 1314 exp_put(exp); 1315 return gssexp; 1316 } 1317 1318 struct svc_export * 1319 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) 1320 { 1321 struct dentry *saved = dget(path->dentry); 1322 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); 1323 1324 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { 1325 struct dentry *parent = dget_parent(path->dentry); 1326 dput(path->dentry); 1327 path->dentry = parent; 1328 exp = rqst_exp_get_by_name(rqstp, path); 1329 } 1330 dput(path->dentry); 1331 path->dentry = saved; 1332 return exp; 1333 } 1334 1335 static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp) 1336 { 1337 u32 fsidv[2]; 1338 1339 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); 1340 1341 return rqst_exp_find(rqstp, FSID_NUM, fsidv); 1342 } 1343 1344 /* 1345 * Called when we need the filehandle for the root of the pseudofs, 1346 * for a given NFSv4 client. The root is defined to be the 1347 * export point with fsid==0 1348 */ 1349 __be32 1350 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) 1351 { 1352 struct svc_export *exp; 1353 __be32 rv; 1354 1355 exp = find_fsidzero_export(rqstp); 1356 if (IS_ERR(exp)) 1357 return nfserrno(PTR_ERR(exp)); 1358 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); 1359 if (rv) 1360 goto out; 1361 rv = check_nfsd_access(exp, rqstp); 1362 if (rv) 1363 fh_put(fhp); 1364 out: 1365 exp_put(exp); 1366 return rv; 1367 } 1368 1369 /* Iterator */ 1370 1371 static void *e_start(struct seq_file *m, loff_t *pos) 1372 __acquires(svc_export_cache.hash_lock) 1373 { 1374 loff_t n = *pos; 1375 unsigned hash, export; 1376 struct cache_head *ch; 1377 1378 exp_readlock(); 1379 read_lock(&svc_export_cache.hash_lock); 1380 if (!n--) 1381 return SEQ_START_TOKEN; 1382 hash = n >> 32; 1383 export = n & ((1LL<<32) - 1); 1384 1385 1386 for (ch=export_table[hash]; ch; ch=ch->next) 1387 if (!export--) 1388 return ch; 1389 n &= ~((1LL<<32) - 1); 1390 do { 1391 hash++; 1392 n += 1LL<<32; 1393 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); 1394 if (hash >= EXPORT_HASHMAX) 1395 return NULL; 1396 *pos = n+1; 1397 return export_table[hash]; 1398 } 1399 1400 static void *e_next(struct seq_file *m, void *p, loff_t *pos) 1401 { 1402 struct cache_head *ch = p; 1403 int hash = (*pos >> 32); 1404 1405 if (p == SEQ_START_TOKEN) 1406 hash = 0; 1407 else if (ch->next == NULL) { 1408 hash++; 1409 *pos += 1LL<<32; 1410 } else { 1411 ++*pos; 1412 return ch->next; 1413 } 1414 *pos &= ~((1LL<<32) - 1); 1415 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { 1416 hash++; 1417 *pos += 1LL<<32; 1418 } 1419 if (hash >= EXPORT_HASHMAX) 1420 return NULL; 1421 ++*pos; 1422 return export_table[hash]; 1423 } 1424 1425 static void e_stop(struct seq_file *m, void *p) 1426 __releases(svc_export_cache.hash_lock) 1427 { 1428 read_unlock(&svc_export_cache.hash_lock); 1429 exp_readunlock(); 1430 } 1431 1432 static struct flags { 1433 int flag; 1434 char *name[2]; 1435 } expflags[] = { 1436 { NFSEXP_READONLY, {"ro", "rw"}}, 1437 { NFSEXP_INSECURE_PORT, {"insecure", ""}}, 1438 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, 1439 { NFSEXP_ALLSQUASH, {"all_squash", ""}}, 1440 { NFSEXP_ASYNC, {"async", "sync"}}, 1441 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, 1442 { NFSEXP_NOHIDE, {"nohide", ""}}, 1443 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, 1444 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, 1445 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, 1446 { NFSEXP_V4ROOT, {"v4root", ""}}, 1447 #ifdef MSNFS 1448 { NFSEXP_MSNFS, {"msnfs", ""}}, 1449 #endif 1450 { 0, {"", ""}} 1451 }; 1452 1453 static void show_expflags(struct seq_file *m, int flags, int mask) 1454 { 1455 struct flags *flg; 1456 int state, first = 0; 1457 1458 for (flg = expflags; flg->flag; flg++) { 1459 if (flg->flag & ~mask) 1460 continue; 1461 state = (flg->flag & flags) ? 0 : 1; 1462 if (*flg->name[state]) 1463 seq_printf(m, "%s%s", first++?",":"", flg->name[state]); 1464 } 1465 } 1466 1467 static void show_secinfo_flags(struct seq_file *m, int flags) 1468 { 1469 seq_printf(m, ","); 1470 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); 1471 } 1472 1473 static bool secinfo_flags_equal(int f, int g) 1474 { 1475 f &= NFSEXP_SECINFO_FLAGS; 1476 g &= NFSEXP_SECINFO_FLAGS; 1477 return f == g; 1478 } 1479 1480 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end) 1481 { 1482 int flags; 1483 1484 flags = (*fp)->flags; 1485 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor); 1486 (*fp)++; 1487 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) { 1488 seq_printf(m, ":%d", (*fp)->pseudoflavor); 1489 (*fp)++; 1490 } 1491 return flags; 1492 } 1493 1494 static void show_secinfo(struct seq_file *m, struct svc_export *exp) 1495 { 1496 struct exp_flavor_info *f; 1497 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; 1498 int flags; 1499 1500 if (exp->ex_nflavors == 0) 1501 return; 1502 f = exp->ex_flavors; 1503 flags = show_secinfo_run(m, &f, end); 1504 if (!secinfo_flags_equal(flags, exp->ex_flags)) 1505 show_secinfo_flags(m, flags); 1506 while (f != end) { 1507 flags = show_secinfo_run(m, &f, end); 1508 show_secinfo_flags(m, flags); 1509 } 1510 } 1511 1512 static void exp_flags(struct seq_file *m, int flag, int fsid, 1513 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc) 1514 { 1515 show_expflags(m, flag, NFSEXP_ALLFLAGS); 1516 if (flag & NFSEXP_FSID) 1517 seq_printf(m, ",fsid=%d", fsid); 1518 if (anonu != (uid_t)-2 && anonu != (0x10000-2)) 1519 seq_printf(m, ",anonuid=%u", anonu); 1520 if (anong != (gid_t)-2 && anong != (0x10000-2)) 1521 seq_printf(m, ",anongid=%u", anong); 1522 if (fsloc && fsloc->locations_count > 0) { 1523 char *loctype = (fsloc->migrated) ? "refer" : "replicas"; 1524 int i; 1525 1526 seq_printf(m, ",%s=", loctype); 1527 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); 1528 seq_putc(m, '@'); 1529 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); 1530 for (i = 1; i < fsloc->locations_count; i++) { 1531 seq_putc(m, ';'); 1532 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); 1533 seq_putc(m, '@'); 1534 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); 1535 } 1536 } 1537 } 1538 1539 static int e_show(struct seq_file *m, void *p) 1540 { 1541 struct cache_head *cp = p; 1542 struct svc_export *exp = container_of(cp, struct svc_export, h); 1543 1544 if (p == SEQ_START_TOKEN) { 1545 seq_puts(m, "# Version 1.1\n"); 1546 seq_puts(m, "# Path Client(Flags) # IPs\n"); 1547 return 0; 1548 } 1549 1550 cache_get(&exp->h); 1551 if (cache_check(&svc_export_cache, &exp->h, NULL)) 1552 return 0; 1553 cache_put(&exp->h, &svc_export_cache); 1554 return svc_export_show(m, &svc_export_cache, cp); 1555 } 1556 1557 const struct seq_operations nfs_exports_op = { 1558 .start = e_start, 1559 .next = e_next, 1560 .stop = e_stop, 1561 .show = e_show, 1562 }; 1563 1564 #ifdef CONFIG_NFSD_DEPRECATED 1565 /* 1566 * Add or modify a client. 1567 * Change requests may involve the list of host addresses. The list of 1568 * exports and possibly existing uid maps are left untouched. 1569 */ 1570 int 1571 exp_addclient(struct nfsctl_client *ncp) 1572 { 1573 struct auth_domain *dom; 1574 int i, err; 1575 struct in6_addr addr6; 1576 1577 /* First, consistency check. */ 1578 err = -EINVAL; 1579 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) 1580 goto out; 1581 if (ncp->cl_naddr > NFSCLNT_ADDRMAX) 1582 goto out; 1583 1584 /* Lock the hashtable */ 1585 exp_writelock(); 1586 1587 dom = unix_domain_find(ncp->cl_ident); 1588 1589 err = -ENOMEM; 1590 if (!dom) 1591 goto out_unlock; 1592 1593 /* Insert client into hashtable. */ 1594 for (i = 0; i < ncp->cl_naddr; i++) { 1595 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6); 1596 auth_unix_add_addr(&init_net, &addr6, dom); 1597 } 1598 auth_unix_forget_old(dom); 1599 auth_domain_put(dom); 1600 1601 err = 0; 1602 1603 out_unlock: 1604 exp_writeunlock(); 1605 out: 1606 return err; 1607 } 1608 1609 /* 1610 * Delete a client given an identifier. 1611 */ 1612 int 1613 exp_delclient(struct nfsctl_client *ncp) 1614 { 1615 int err; 1616 struct auth_domain *dom; 1617 1618 err = -EINVAL; 1619 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) 1620 goto out; 1621 1622 /* Lock the hashtable */ 1623 exp_writelock(); 1624 1625 dom = auth_domain_find(ncp->cl_ident); 1626 /* just make sure that no addresses work 1627 * and that it will expire soon 1628 */ 1629 if (dom) { 1630 err = auth_unix_forget_old(dom); 1631 auth_domain_put(dom); 1632 } 1633 1634 exp_writeunlock(); 1635 out: 1636 return err; 1637 } 1638 1639 /* 1640 * Verify that string is non-empty and does not exceed max length. 1641 */ 1642 static int 1643 exp_verify_string(char *cp, int max) 1644 { 1645 int i; 1646 1647 for (i = 0; i < max; i++) 1648 if (!cp[i]) 1649 return i; 1650 cp[i] = 0; 1651 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); 1652 return 0; 1653 } 1654 #endif /* CONFIG_NFSD_DEPRECATED */ 1655 1656 /* 1657 * Initialize the exports module. 1658 */ 1659 int 1660 nfsd_export_init(void) 1661 { 1662 int rv; 1663 dprintk("nfsd: initializing export module.\n"); 1664 1665 rv = cache_register(&svc_export_cache); 1666 if (rv) 1667 return rv; 1668 rv = cache_register(&svc_expkey_cache); 1669 if (rv) 1670 cache_unregister(&svc_export_cache); 1671 return rv; 1672 1673 } 1674 1675 /* 1676 * Flush exports table - called when last nfsd thread is killed 1677 */ 1678 void 1679 nfsd_export_flush(void) 1680 { 1681 exp_writelock(); 1682 cache_purge(&svc_expkey_cache); 1683 cache_purge(&svc_export_cache); 1684 exp_writeunlock(); 1685 } 1686 1687 /* 1688 * Shutdown the exports module. 1689 */ 1690 void 1691 nfsd_export_shutdown(void) 1692 { 1693 1694 dprintk("nfsd: shutting down export module.\n"); 1695 1696 exp_writelock(); 1697 1698 cache_unregister(&svc_expkey_cache); 1699 cache_unregister(&svc_export_cache); 1700 svcauth_unix_purge(); 1701 1702 exp_writeunlock(); 1703 dprintk("nfsd: export shutdown complete.\n"); 1704 } 1705