1 /* 2 * linux/fs/nfs/super.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs superblock handling functions 7 * 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 * Split from inode.c by David Howells <dhowells@redhat.com> 15 * 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a 17 * particular server are held in the same superblock 18 * - NFS superblocks can have several effective roots to the dentry tree 19 * - directory type roots are spliced into the tree when a path from one root reaches the root 20 * of another (see nfs_lookup()) 21 */ 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 26 #include <linux/time.h> 27 #include <linux/kernel.h> 28 #include <linux/mm.h> 29 #include <linux/string.h> 30 #include <linux/stat.h> 31 #include <linux/errno.h> 32 #include <linux/unistd.h> 33 #include <linux/sunrpc/clnt.h> 34 #include <linux/sunrpc/addr.h> 35 #include <linux/sunrpc/stats.h> 36 #include <linux/sunrpc/metrics.h> 37 #include <linux/sunrpc/xprtsock.h> 38 #include <linux/sunrpc/xprtrdma.h> 39 #include <linux/nfs_fs.h> 40 #include <linux/nfs_mount.h> 41 #include <linux/nfs4_mount.h> 42 #include <linux/lockd/bind.h> 43 #include <linux/seq_file.h> 44 #include <linux/mount.h> 45 #include <linux/namei.h> 46 #include <linux/nfs_idmap.h> 47 #include <linux/vfs.h> 48 #include <linux/inet.h> 49 #include <linux/in6.h> 50 #include <linux/slab.h> 51 #include <net/ipv6.h> 52 #include <linux/netdevice.h> 53 #include <linux/nfs_xdr.h> 54 #include <linux/magic.h> 55 #include <linux/parser.h> 56 #include <linux/nsproxy.h> 57 #include <linux/rcupdate.h> 58 59 #include <asm/uaccess.h> 60 61 #include "nfs4_fs.h" 62 #include "callback.h" 63 #include "delegation.h" 64 #include "iostat.h" 65 #include "internal.h" 66 #include "fscache.h" 67 #include "nfs4session.h" 68 #include "pnfs.h" 69 #include "nfs.h" 70 71 #define NFSDBG_FACILITY NFSDBG_VFS 72 #define NFS_TEXT_DATA 1 73 74 #if IS_ENABLED(CONFIG_NFS_V3) 75 #define NFS_DEFAULT_VERSION 3 76 #else 77 #define NFS_DEFAULT_VERSION 2 78 #endif 79 80 enum { 81 /* Mount options that take no arguments */ 82 Opt_soft, Opt_hard, 83 Opt_posix, Opt_noposix, 84 Opt_cto, Opt_nocto, 85 Opt_ac, Opt_noac, 86 Opt_lock, Opt_nolock, 87 Opt_udp, Opt_tcp, Opt_rdma, 88 Opt_acl, Opt_noacl, 89 Opt_rdirplus, Opt_nordirplus, 90 Opt_sharecache, Opt_nosharecache, 91 Opt_resvport, Opt_noresvport, 92 Opt_fscache, Opt_nofscache, 93 Opt_migration, Opt_nomigration, 94 95 /* Mount options that take integer arguments */ 96 Opt_port, 97 Opt_rsize, Opt_wsize, Opt_bsize, 98 Opt_timeo, Opt_retrans, 99 Opt_acregmin, Opt_acregmax, 100 Opt_acdirmin, Opt_acdirmax, 101 Opt_actimeo, 102 Opt_namelen, 103 Opt_mountport, 104 Opt_mountvers, 105 Opt_minorversion, 106 107 /* Mount options that take string arguments */ 108 Opt_nfsvers, 109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 110 Opt_addr, Opt_mountaddr, Opt_clientaddr, 111 Opt_lookupcache, 112 Opt_fscache_uniq, 113 Opt_local_lock, 114 115 /* Special mount options */ 116 Opt_userspace, Opt_deprecated, Opt_sloppy, 117 118 Opt_err 119 }; 120 121 static const match_table_t nfs_mount_option_tokens = { 122 { Opt_userspace, "bg" }, 123 { Opt_userspace, "fg" }, 124 { Opt_userspace, "retry=%s" }, 125 126 { Opt_sloppy, "sloppy" }, 127 128 { Opt_soft, "soft" }, 129 { Opt_hard, "hard" }, 130 { Opt_deprecated, "intr" }, 131 { Opt_deprecated, "nointr" }, 132 { Opt_posix, "posix" }, 133 { Opt_noposix, "noposix" }, 134 { Opt_cto, "cto" }, 135 { Opt_nocto, "nocto" }, 136 { Opt_ac, "ac" }, 137 { Opt_noac, "noac" }, 138 { Opt_lock, "lock" }, 139 { Opt_nolock, "nolock" }, 140 { Opt_udp, "udp" }, 141 { Opt_tcp, "tcp" }, 142 { Opt_rdma, "rdma" }, 143 { Opt_acl, "acl" }, 144 { Opt_noacl, "noacl" }, 145 { Opt_rdirplus, "rdirplus" }, 146 { Opt_nordirplus, "nordirplus" }, 147 { Opt_sharecache, "sharecache" }, 148 { Opt_nosharecache, "nosharecache" }, 149 { Opt_resvport, "resvport" }, 150 { Opt_noresvport, "noresvport" }, 151 { Opt_fscache, "fsc" }, 152 { Opt_nofscache, "nofsc" }, 153 { Opt_migration, "migration" }, 154 { Opt_nomigration, "nomigration" }, 155 156 { Opt_port, "port=%s" }, 157 { Opt_rsize, "rsize=%s" }, 158 { Opt_wsize, "wsize=%s" }, 159 { Opt_bsize, "bsize=%s" }, 160 { Opt_timeo, "timeo=%s" }, 161 { Opt_retrans, "retrans=%s" }, 162 { Opt_acregmin, "acregmin=%s" }, 163 { Opt_acregmax, "acregmax=%s" }, 164 { Opt_acdirmin, "acdirmin=%s" }, 165 { Opt_acdirmax, "acdirmax=%s" }, 166 { Opt_actimeo, "actimeo=%s" }, 167 { Opt_namelen, "namlen=%s" }, 168 { Opt_mountport, "mountport=%s" }, 169 { Opt_mountvers, "mountvers=%s" }, 170 { Opt_minorversion, "minorversion=%s" }, 171 172 { Opt_nfsvers, "nfsvers=%s" }, 173 { Opt_nfsvers, "vers=%s" }, 174 175 { Opt_sec, "sec=%s" }, 176 { Opt_proto, "proto=%s" }, 177 { Opt_mountproto, "mountproto=%s" }, 178 { Opt_addr, "addr=%s" }, 179 { Opt_clientaddr, "clientaddr=%s" }, 180 { Opt_mounthost, "mounthost=%s" }, 181 { Opt_mountaddr, "mountaddr=%s" }, 182 183 { Opt_lookupcache, "lookupcache=%s" }, 184 { Opt_fscache_uniq, "fsc=%s" }, 185 { Opt_local_lock, "local_lock=%s" }, 186 187 /* The following needs to be listed after all other options */ 188 { Opt_nfsvers, "v%s" }, 189 190 { Opt_err, NULL } 191 }; 192 193 enum { 194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 195 196 Opt_xprt_err 197 }; 198 199 static const match_table_t nfs_xprt_protocol_tokens = { 200 { Opt_xprt_udp, "udp" }, 201 { Opt_xprt_udp6, "udp6" }, 202 { Opt_xprt_tcp, "tcp" }, 203 { Opt_xprt_tcp6, "tcp6" }, 204 { Opt_xprt_rdma, "rdma" }, 205 206 { Opt_xprt_err, NULL } 207 }; 208 209 enum { 210 Opt_sec_none, Opt_sec_sys, 211 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 212 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 213 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 214 215 Opt_sec_err 216 }; 217 218 static const match_table_t nfs_secflavor_tokens = { 219 { Opt_sec_none, "none" }, 220 { Opt_sec_none, "null" }, 221 { Opt_sec_sys, "sys" }, 222 223 { Opt_sec_krb5, "krb5" }, 224 { Opt_sec_krb5i, "krb5i" }, 225 { Opt_sec_krb5p, "krb5p" }, 226 227 { Opt_sec_lkey, "lkey" }, 228 { Opt_sec_lkeyi, "lkeyi" }, 229 { Opt_sec_lkeyp, "lkeyp" }, 230 231 { Opt_sec_spkm, "spkm3" }, 232 { Opt_sec_spkmi, "spkm3i" }, 233 { Opt_sec_spkmp, "spkm3p" }, 234 235 { Opt_sec_err, NULL } 236 }; 237 238 enum { 239 Opt_lookupcache_all, Opt_lookupcache_positive, 240 Opt_lookupcache_none, 241 242 Opt_lookupcache_err 243 }; 244 245 static match_table_t nfs_lookupcache_tokens = { 246 { Opt_lookupcache_all, "all" }, 247 { Opt_lookupcache_positive, "pos" }, 248 { Opt_lookupcache_positive, "positive" }, 249 { Opt_lookupcache_none, "none" }, 250 251 { Opt_lookupcache_err, NULL } 252 }; 253 254 enum { 255 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 256 Opt_local_lock_none, 257 258 Opt_local_lock_err 259 }; 260 261 static match_table_t nfs_local_lock_tokens = { 262 { Opt_local_lock_all, "all" }, 263 { Opt_local_lock_flock, "flock" }, 264 { Opt_local_lock_posix, "posix" }, 265 { Opt_local_lock_none, "none" }, 266 267 { Opt_local_lock_err, NULL } 268 }; 269 270 enum { 271 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 272 Opt_vers_4_1, Opt_vers_4_2, 273 274 Opt_vers_err 275 }; 276 277 static match_table_t nfs_vers_tokens = { 278 { Opt_vers_2, "2" }, 279 { Opt_vers_3, "3" }, 280 { Opt_vers_4, "4" }, 281 { Opt_vers_4_0, "4.0" }, 282 { Opt_vers_4_1, "4.1" }, 283 { Opt_vers_4_2, "4.2" }, 284 285 { Opt_vers_err, NULL } 286 }; 287 288 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 289 int flags, const char *dev_name, void *raw_data); 290 291 struct file_system_type nfs_fs_type = { 292 .owner = THIS_MODULE, 293 .name = "nfs", 294 .mount = nfs_fs_mount, 295 .kill_sb = nfs_kill_super, 296 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 297 }; 298 MODULE_ALIAS_FS("nfs"); 299 EXPORT_SYMBOL_GPL(nfs_fs_type); 300 301 struct file_system_type nfs_xdev_fs_type = { 302 .owner = THIS_MODULE, 303 .name = "nfs", 304 .mount = nfs_xdev_mount, 305 .kill_sb = nfs_kill_super, 306 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 307 }; 308 309 const struct super_operations nfs_sops = { 310 .alloc_inode = nfs_alloc_inode, 311 .destroy_inode = nfs_destroy_inode, 312 .write_inode = nfs_write_inode, 313 .drop_inode = nfs_drop_inode, 314 .statfs = nfs_statfs, 315 .evict_inode = nfs_evict_inode, 316 .umount_begin = nfs_umount_begin, 317 .show_options = nfs_show_options, 318 .show_devname = nfs_show_devname, 319 .show_path = nfs_show_path, 320 .show_stats = nfs_show_stats, 321 .remount_fs = nfs_remount, 322 }; 323 EXPORT_SYMBOL_GPL(nfs_sops); 324 325 #if IS_ENABLED(CONFIG_NFS_V4) 326 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 327 static int nfs4_validate_mount_data(void *options, 328 struct nfs_parsed_mount_data *args, const char *dev_name); 329 330 struct file_system_type nfs4_fs_type = { 331 .owner = THIS_MODULE, 332 .name = "nfs4", 333 .mount = nfs_fs_mount, 334 .kill_sb = nfs_kill_super, 335 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 336 }; 337 MODULE_ALIAS_FS("nfs4"); 338 MODULE_ALIAS("nfs4"); 339 EXPORT_SYMBOL_GPL(nfs4_fs_type); 340 341 static int __init register_nfs4_fs(void) 342 { 343 return register_filesystem(&nfs4_fs_type); 344 } 345 346 static void unregister_nfs4_fs(void) 347 { 348 unregister_filesystem(&nfs4_fs_type); 349 } 350 #else 351 static int __init register_nfs4_fs(void) 352 { 353 return 0; 354 } 355 356 static void unregister_nfs4_fs(void) 357 { 358 } 359 #endif 360 361 static struct shrinker acl_shrinker = { 362 .count_objects = nfs_access_cache_count, 363 .scan_objects = nfs_access_cache_scan, 364 .seeks = DEFAULT_SEEKS, 365 }; 366 367 /* 368 * Register the NFS filesystems 369 */ 370 int __init register_nfs_fs(void) 371 { 372 int ret; 373 374 ret = register_filesystem(&nfs_fs_type); 375 if (ret < 0) 376 goto error_0; 377 378 ret = register_nfs4_fs(); 379 if (ret < 0) 380 goto error_1; 381 382 ret = nfs_register_sysctl(); 383 if (ret < 0) 384 goto error_2; 385 register_shrinker(&acl_shrinker); 386 return 0; 387 388 error_2: 389 unregister_nfs4_fs(); 390 error_1: 391 unregister_filesystem(&nfs_fs_type); 392 error_0: 393 return ret; 394 } 395 396 /* 397 * Unregister the NFS filesystems 398 */ 399 void __exit unregister_nfs_fs(void) 400 { 401 unregister_shrinker(&acl_shrinker); 402 nfs_unregister_sysctl(); 403 unregister_nfs4_fs(); 404 unregister_filesystem(&nfs_fs_type); 405 } 406 407 bool nfs_sb_active(struct super_block *sb) 408 { 409 struct nfs_server *server = NFS_SB(sb); 410 411 if (!atomic_inc_not_zero(&sb->s_active)) 412 return false; 413 if (atomic_inc_return(&server->active) != 1) 414 atomic_dec(&sb->s_active); 415 return true; 416 } 417 EXPORT_SYMBOL_GPL(nfs_sb_active); 418 419 void nfs_sb_deactive(struct super_block *sb) 420 { 421 struct nfs_server *server = NFS_SB(sb); 422 423 if (atomic_dec_and_test(&server->active)) 424 deactivate_super(sb); 425 } 426 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 427 428 /* 429 * Deliver file system statistics to userspace 430 */ 431 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 432 { 433 struct nfs_server *server = NFS_SB(dentry->d_sb); 434 unsigned char blockbits; 435 unsigned long blockres; 436 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 437 struct nfs_fsstat res; 438 int error = -ENOMEM; 439 440 res.fattr = nfs_alloc_fattr(); 441 if (res.fattr == NULL) 442 goto out_err; 443 444 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 445 if (unlikely(error == -ESTALE)) { 446 struct dentry *pd_dentry; 447 448 pd_dentry = dget_parent(dentry); 449 if (pd_dentry != NULL) { 450 nfs_zap_caches(pd_dentry->d_inode); 451 dput(pd_dentry); 452 } 453 } 454 nfs_free_fattr(res.fattr); 455 if (error < 0) 456 goto out_err; 457 458 buf->f_type = NFS_SUPER_MAGIC; 459 460 /* 461 * Current versions of glibc do not correctly handle the 462 * case where f_frsize != f_bsize. Eventually we want to 463 * report the value of wtmult in this field. 464 */ 465 buf->f_frsize = dentry->d_sb->s_blocksize; 466 467 /* 468 * On most *nix systems, f_blocks, f_bfree, and f_bavail 469 * are reported in units of f_frsize. Linux hasn't had 470 * an f_frsize field in its statfs struct until recently, 471 * thus historically Linux's sys_statfs reports these 472 * fields in units of f_bsize. 473 */ 474 buf->f_bsize = dentry->d_sb->s_blocksize; 475 blockbits = dentry->d_sb->s_blocksize_bits; 476 blockres = (1 << blockbits) - 1; 477 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 478 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 479 buf->f_bavail = (res.abytes + blockres) >> blockbits; 480 481 buf->f_files = res.tfiles; 482 buf->f_ffree = res.afiles; 483 484 buf->f_namelen = server->namelen; 485 486 return 0; 487 488 out_err: 489 dprintk("%s: statfs error = %d\n", __func__, -error); 490 return error; 491 } 492 EXPORT_SYMBOL_GPL(nfs_statfs); 493 494 /* 495 * Map the security flavour number to a name 496 */ 497 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 498 { 499 static const struct { 500 rpc_authflavor_t flavour; 501 const char *str; 502 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { 503 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ 504 { RPC_AUTH_NULL, "null" }, 505 { RPC_AUTH_UNIX, "sys" }, 506 { RPC_AUTH_GSS_KRB5, "krb5" }, 507 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 508 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 509 { RPC_AUTH_GSS_LKEY, "lkey" }, 510 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 511 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 512 { RPC_AUTH_GSS_SPKM, "spkm" }, 513 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 514 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 515 { UINT_MAX, "unknown" } 516 }; 517 int i; 518 519 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 520 if (sec_flavours[i].flavour == flavour) 521 break; 522 } 523 return sec_flavours[i].str; 524 } 525 526 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 527 int showdefaults) 528 { 529 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 530 531 seq_printf(m, ",mountproto="); 532 switch (sap->sa_family) { 533 case AF_INET: 534 switch (nfss->mountd_protocol) { 535 case IPPROTO_UDP: 536 seq_printf(m, RPCBIND_NETID_UDP); 537 break; 538 case IPPROTO_TCP: 539 seq_printf(m, RPCBIND_NETID_TCP); 540 break; 541 default: 542 if (showdefaults) 543 seq_printf(m, "auto"); 544 } 545 break; 546 case AF_INET6: 547 switch (nfss->mountd_protocol) { 548 case IPPROTO_UDP: 549 seq_printf(m, RPCBIND_NETID_UDP6); 550 break; 551 case IPPROTO_TCP: 552 seq_printf(m, RPCBIND_NETID_TCP6); 553 break; 554 default: 555 if (showdefaults) 556 seq_printf(m, "auto"); 557 } 558 break; 559 default: 560 if (showdefaults) 561 seq_printf(m, "auto"); 562 } 563 } 564 565 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 566 int showdefaults) 567 { 568 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 569 570 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 571 return; 572 573 switch (sap->sa_family) { 574 case AF_INET: { 575 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 576 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 577 break; 578 } 579 case AF_INET6: { 580 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 581 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 582 break; 583 } 584 default: 585 if (showdefaults) 586 seq_printf(m, ",mountaddr=unspecified"); 587 } 588 589 if (nfss->mountd_version || showdefaults) 590 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 591 if ((nfss->mountd_port && 592 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 593 showdefaults) 594 seq_printf(m, ",mountport=%u", nfss->mountd_port); 595 596 nfs_show_mountd_netid(m, nfss, showdefaults); 597 } 598 599 #if IS_ENABLED(CONFIG_NFS_V4) 600 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 601 int showdefaults) 602 { 603 struct nfs_client *clp = nfss->nfs_client; 604 605 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 606 } 607 #else 608 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 609 int showdefaults) 610 { 611 } 612 #endif 613 614 static void nfs_show_nfs_version(struct seq_file *m, 615 unsigned int version, 616 unsigned int minorversion) 617 { 618 seq_printf(m, ",vers=%u", version); 619 if (version == 4) 620 seq_printf(m, ".%u", minorversion); 621 } 622 623 /* 624 * Describe the mount options in force on this server representation 625 */ 626 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 627 int showdefaults) 628 { 629 static const struct proc_nfs_info { 630 int flag; 631 const char *str; 632 const char *nostr; 633 } nfs_info[] = { 634 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 635 { NFS_MOUNT_POSIX, ",posix", "" }, 636 { NFS_MOUNT_NOCTO, ",nocto", "" }, 637 { NFS_MOUNT_NOAC, ",noac", "" }, 638 { NFS_MOUNT_NONLM, ",nolock", "" }, 639 { NFS_MOUNT_NOACL, ",noacl", "" }, 640 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 641 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 642 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 643 { 0, NULL, NULL } 644 }; 645 const struct proc_nfs_info *nfs_infop; 646 struct nfs_client *clp = nfss->nfs_client; 647 u32 version = clp->rpc_ops->version; 648 int local_flock, local_fcntl; 649 650 nfs_show_nfs_version(m, version, clp->cl_minorversion); 651 seq_printf(m, ",rsize=%u", nfss->rsize); 652 seq_printf(m, ",wsize=%u", nfss->wsize); 653 if (nfss->bsize != 0) 654 seq_printf(m, ",bsize=%u", nfss->bsize); 655 seq_printf(m, ",namlen=%u", nfss->namelen); 656 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 657 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 658 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 659 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 660 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 661 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 662 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 663 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 664 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 665 if (nfss->flags & nfs_infop->flag) 666 seq_puts(m, nfs_infop->str); 667 else 668 seq_puts(m, nfs_infop->nostr); 669 } 670 rcu_read_lock(); 671 seq_printf(m, ",proto=%s", 672 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 673 rcu_read_unlock(); 674 if (version == 4) { 675 if (nfss->port != NFS_PORT) 676 seq_printf(m, ",port=%u", nfss->port); 677 } else 678 if (nfss->port) 679 seq_printf(m, ",port=%u", nfss->port); 680 681 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 682 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 683 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 684 685 if (version != 4) 686 nfs_show_mountd_options(m, nfss, showdefaults); 687 else 688 nfs_show_nfsv4_options(m, nfss, showdefaults); 689 690 if (nfss->options & NFS_OPTION_FSCACHE) 691 seq_printf(m, ",fsc"); 692 693 if (nfss->options & NFS_OPTION_MIGRATION) 694 seq_printf(m, ",migration"); 695 696 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 697 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 698 seq_printf(m, ",lookupcache=none"); 699 else 700 seq_printf(m, ",lookupcache=pos"); 701 } 702 703 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 704 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 705 706 if (!local_flock && !local_fcntl) 707 seq_printf(m, ",local_lock=none"); 708 else if (local_flock && local_fcntl) 709 seq_printf(m, ",local_lock=all"); 710 else if (local_flock) 711 seq_printf(m, ",local_lock=flock"); 712 else 713 seq_printf(m, ",local_lock=posix"); 714 } 715 716 /* 717 * Describe the mount options on this VFS mountpoint 718 */ 719 int nfs_show_options(struct seq_file *m, struct dentry *root) 720 { 721 struct nfs_server *nfss = NFS_SB(root->d_sb); 722 723 nfs_show_mount_options(m, nfss, 0); 724 725 rcu_read_lock(); 726 seq_printf(m, ",addr=%s", 727 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 728 RPC_DISPLAY_ADDR)); 729 rcu_read_unlock(); 730 731 return 0; 732 } 733 EXPORT_SYMBOL_GPL(nfs_show_options); 734 735 #if IS_ENABLED(CONFIG_NFS_V4) 736 #ifdef CONFIG_NFS_V4_1 737 static void show_sessions(struct seq_file *m, struct nfs_server *server) 738 { 739 if (nfs4_has_session(server->nfs_client)) 740 seq_printf(m, ",sessions"); 741 } 742 #else 743 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 744 #endif 745 #endif 746 747 #ifdef CONFIG_NFS_V4_1 748 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 749 { 750 seq_printf(m, ",pnfs="); 751 if (server->pnfs_curr_ld) 752 seq_printf(m, "%s", server->pnfs_curr_ld->name); 753 else 754 seq_printf(m, "not configured"); 755 } 756 757 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 758 { 759 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 760 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 761 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 762 "date='%llu,%u'", 763 impl_id->name, impl_id->domain, 764 impl_id->date.seconds, impl_id->date.nseconds); 765 } 766 } 767 #else 768 #if IS_ENABLED(CONFIG_NFS_V4) 769 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 770 { 771 } 772 #endif 773 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 774 { 775 } 776 #endif 777 778 int nfs_show_devname(struct seq_file *m, struct dentry *root) 779 { 780 char *page = (char *) __get_free_page(GFP_KERNEL); 781 char *devname, *dummy; 782 int err = 0; 783 if (!page) 784 return -ENOMEM; 785 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 786 if (IS_ERR(devname)) 787 err = PTR_ERR(devname); 788 else 789 seq_escape(m, devname, " \t\n\\"); 790 free_page((unsigned long)page); 791 return err; 792 } 793 EXPORT_SYMBOL_GPL(nfs_show_devname); 794 795 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 796 { 797 seq_puts(m, "/"); 798 return 0; 799 } 800 EXPORT_SYMBOL_GPL(nfs_show_path); 801 802 /* 803 * Present statistical information for this VFS mountpoint 804 */ 805 int nfs_show_stats(struct seq_file *m, struct dentry *root) 806 { 807 int i, cpu; 808 struct nfs_server *nfss = NFS_SB(root->d_sb); 809 struct rpc_auth *auth = nfss->client->cl_auth; 810 struct nfs_iostats totals = { }; 811 812 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 813 814 /* 815 * Display all mount option settings 816 */ 817 seq_printf(m, "\n\topts:\t"); 818 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 819 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 820 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 821 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 822 nfs_show_mount_options(m, nfss, 1); 823 824 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 825 826 show_implementation_id(m, nfss); 827 828 seq_printf(m, "\n\tcaps:\t"); 829 seq_printf(m, "caps=0x%x", nfss->caps); 830 seq_printf(m, ",wtmult=%u", nfss->wtmult); 831 seq_printf(m, ",dtsize=%u", nfss->dtsize); 832 seq_printf(m, ",bsize=%u", nfss->bsize); 833 seq_printf(m, ",namlen=%u", nfss->namelen); 834 835 #if IS_ENABLED(CONFIG_NFS_V4) 836 if (nfss->nfs_client->rpc_ops->version == 4) { 837 seq_printf(m, "\n\tnfsv4:\t"); 838 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 839 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 840 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 841 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 842 show_sessions(m, nfss); 843 show_pnfs(m, nfss); 844 } 845 #endif 846 847 /* 848 * Display security flavor in effect for this mount 849 */ 850 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 851 if (auth->au_flavor) 852 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 853 854 /* 855 * Display superblock I/O counters 856 */ 857 for_each_possible_cpu(cpu) { 858 struct nfs_iostats *stats; 859 860 preempt_disable(); 861 stats = per_cpu_ptr(nfss->io_stats, cpu); 862 863 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 864 totals.events[i] += stats->events[i]; 865 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 866 totals.bytes[i] += stats->bytes[i]; 867 #ifdef CONFIG_NFS_FSCACHE 868 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 869 totals.fscache[i] += stats->fscache[i]; 870 #endif 871 872 preempt_enable(); 873 } 874 875 seq_printf(m, "\n\tevents:\t"); 876 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 877 seq_printf(m, "%lu ", totals.events[i]); 878 seq_printf(m, "\n\tbytes:\t"); 879 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 880 seq_printf(m, "%Lu ", totals.bytes[i]); 881 #ifdef CONFIG_NFS_FSCACHE 882 if (nfss->options & NFS_OPTION_FSCACHE) { 883 seq_printf(m, "\n\tfsc:\t"); 884 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 885 seq_printf(m, "%Lu ", totals.bytes[i]); 886 } 887 #endif 888 seq_printf(m, "\n"); 889 890 rpc_print_iostats(m, nfss->client); 891 892 return 0; 893 } 894 EXPORT_SYMBOL_GPL(nfs_show_stats); 895 896 /* 897 * Begin unmount by attempting to remove all automounted mountpoints we added 898 * in response to xdev traversals and referrals 899 */ 900 void nfs_umount_begin(struct super_block *sb) 901 { 902 struct nfs_server *server; 903 struct rpc_clnt *rpc; 904 905 server = NFS_SB(sb); 906 /* -EIO all pending I/O */ 907 rpc = server->client_acl; 908 if (!IS_ERR(rpc)) 909 rpc_killall_tasks(rpc); 910 rpc = server->client; 911 if (!IS_ERR(rpc)) 912 rpc_killall_tasks(rpc); 913 } 914 EXPORT_SYMBOL_GPL(nfs_umount_begin); 915 916 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 917 { 918 struct nfs_parsed_mount_data *data; 919 920 data = kzalloc(sizeof(*data), GFP_KERNEL); 921 if (data) { 922 data->acregmin = NFS_DEF_ACREGMIN; 923 data->acregmax = NFS_DEF_ACREGMAX; 924 data->acdirmin = NFS_DEF_ACDIRMIN; 925 data->acdirmax = NFS_DEF_ACDIRMAX; 926 data->mount_server.port = NFS_UNSPEC_PORT; 927 data->nfs_server.port = NFS_UNSPEC_PORT; 928 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 929 data->selected_flavor = RPC_AUTH_MAXFLAVOR; 930 data->minorversion = 0; 931 data->need_mount = true; 932 data->net = current->nsproxy->net_ns; 933 security_init_mnt_opts(&data->lsm_opts); 934 } 935 return data; 936 } 937 938 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 939 { 940 if (data) { 941 kfree(data->client_address); 942 kfree(data->mount_server.hostname); 943 kfree(data->nfs_server.export_path); 944 kfree(data->nfs_server.hostname); 945 kfree(data->fscache_uniq); 946 security_free_mnt_opts(&data->lsm_opts); 947 kfree(data); 948 } 949 } 950 951 /* 952 * Sanity-check a server address provided by the mount command. 953 * 954 * Address family must be initialized, and address must not be 955 * the ANY address for that family. 956 */ 957 static int nfs_verify_server_address(struct sockaddr *addr) 958 { 959 switch (addr->sa_family) { 960 case AF_INET: { 961 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 962 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 963 } 964 case AF_INET6: { 965 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 966 return !ipv6_addr_any(sa); 967 } 968 } 969 970 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 971 return 0; 972 } 973 974 /* 975 * Select between a default port value and a user-specified port value. 976 * If a zero value is set, then autobind will be used. 977 */ 978 static void nfs_set_port(struct sockaddr *sap, int *port, 979 const unsigned short default_port) 980 { 981 if (*port == NFS_UNSPEC_PORT) 982 *port = default_port; 983 984 rpc_set_port(sap, *port); 985 } 986 987 /* 988 * Sanity check the NFS transport protocol. 989 * 990 */ 991 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 992 { 993 switch (mnt->nfs_server.protocol) { 994 case XPRT_TRANSPORT_UDP: 995 case XPRT_TRANSPORT_TCP: 996 case XPRT_TRANSPORT_RDMA: 997 break; 998 default: 999 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1000 } 1001 } 1002 1003 /* 1004 * For text based NFSv2/v3 mounts, the mount protocol transport default 1005 * settings should depend upon the specified NFS transport. 1006 */ 1007 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1008 { 1009 nfs_validate_transport_protocol(mnt); 1010 1011 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1012 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1013 return; 1014 switch (mnt->nfs_server.protocol) { 1015 case XPRT_TRANSPORT_UDP: 1016 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1017 break; 1018 case XPRT_TRANSPORT_TCP: 1019 case XPRT_TRANSPORT_RDMA: 1020 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1021 } 1022 } 1023 1024 /* 1025 * Add 'flavor' to 'auth_info' if not already present. 1026 * Returns true if 'flavor' ends up in the list, false otherwise 1027 */ 1028 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, 1029 rpc_authflavor_t flavor) 1030 { 1031 unsigned int i; 1032 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors); 1033 1034 /* make sure this flavor isn't already in the list */ 1035 for (i = 0; i < auth_info->flavor_len; i++) { 1036 if (flavor == auth_info->flavors[i]) 1037 return true; 1038 } 1039 1040 if (auth_info->flavor_len + 1 >= max_flavor_len) { 1041 dfprintk(MOUNT, "NFS: too many sec= flavors\n"); 1042 return false; 1043 } 1044 1045 auth_info->flavors[auth_info->flavor_len++] = flavor; 1046 return true; 1047 } 1048 1049 /* 1050 * Return true if 'match' is in auth_info or auth_info is empty. 1051 * Return false otherwise. 1052 */ 1053 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 1054 rpc_authflavor_t match) 1055 { 1056 int i; 1057 1058 if (!auth_info->flavor_len) 1059 return true; 1060 1061 for (i = 0; i < auth_info->flavor_len; i++) { 1062 if (auth_info->flavors[i] == match) 1063 return true; 1064 } 1065 return false; 1066 } 1067 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 1068 1069 /* 1070 * Parse the value of the 'sec=' option. 1071 */ 1072 static int nfs_parse_security_flavors(char *value, 1073 struct nfs_parsed_mount_data *mnt) 1074 { 1075 substring_t args[MAX_OPT_ARGS]; 1076 rpc_authflavor_t pseudoflavor; 1077 char *p; 1078 1079 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1080 1081 while ((p = strsep(&value, ":")) != NULL) { 1082 switch (match_token(p, nfs_secflavor_tokens, args)) { 1083 case Opt_sec_none: 1084 pseudoflavor = RPC_AUTH_NULL; 1085 break; 1086 case Opt_sec_sys: 1087 pseudoflavor = RPC_AUTH_UNIX; 1088 break; 1089 case Opt_sec_krb5: 1090 pseudoflavor = RPC_AUTH_GSS_KRB5; 1091 break; 1092 case Opt_sec_krb5i: 1093 pseudoflavor = RPC_AUTH_GSS_KRB5I; 1094 break; 1095 case Opt_sec_krb5p: 1096 pseudoflavor = RPC_AUTH_GSS_KRB5P; 1097 break; 1098 case Opt_sec_lkey: 1099 pseudoflavor = RPC_AUTH_GSS_LKEY; 1100 break; 1101 case Opt_sec_lkeyi: 1102 pseudoflavor = RPC_AUTH_GSS_LKEYI; 1103 break; 1104 case Opt_sec_lkeyp: 1105 pseudoflavor = RPC_AUTH_GSS_LKEYP; 1106 break; 1107 case Opt_sec_spkm: 1108 pseudoflavor = RPC_AUTH_GSS_SPKM; 1109 break; 1110 case Opt_sec_spkmi: 1111 pseudoflavor = RPC_AUTH_GSS_SPKMI; 1112 break; 1113 case Opt_sec_spkmp: 1114 pseudoflavor = RPC_AUTH_GSS_SPKMP; 1115 break; 1116 default: 1117 dfprintk(MOUNT, 1118 "NFS: sec= option '%s' not recognized\n", p); 1119 return 0; 1120 } 1121 1122 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor)) 1123 return 0; 1124 } 1125 1126 return 1; 1127 } 1128 1129 static int nfs_parse_version_string(char *string, 1130 struct nfs_parsed_mount_data *mnt, 1131 substring_t *args) 1132 { 1133 mnt->flags &= ~NFS_MOUNT_VER3; 1134 switch (match_token(string, nfs_vers_tokens, args)) { 1135 case Opt_vers_2: 1136 mnt->version = 2; 1137 break; 1138 case Opt_vers_3: 1139 mnt->flags |= NFS_MOUNT_VER3; 1140 mnt->version = 3; 1141 break; 1142 case Opt_vers_4: 1143 /* Backward compatibility option. In future, 1144 * the mount program should always supply 1145 * a NFSv4 minor version number. 1146 */ 1147 mnt->version = 4; 1148 break; 1149 case Opt_vers_4_0: 1150 mnt->version = 4; 1151 mnt->minorversion = 0; 1152 break; 1153 case Opt_vers_4_1: 1154 mnt->version = 4; 1155 mnt->minorversion = 1; 1156 break; 1157 case Opt_vers_4_2: 1158 mnt->version = 4; 1159 mnt->minorversion = 2; 1160 break; 1161 default: 1162 return 0; 1163 } 1164 return 1; 1165 } 1166 1167 static int nfs_get_option_str(substring_t args[], char **option) 1168 { 1169 kfree(*option); 1170 *option = match_strdup(args); 1171 return !*option; 1172 } 1173 1174 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1175 { 1176 int rc; 1177 char *string; 1178 1179 string = match_strdup(args); 1180 if (string == NULL) 1181 return -ENOMEM; 1182 rc = kstrtoul(string, 10, option); 1183 kfree(string); 1184 1185 return rc; 1186 } 1187 1188 /* 1189 * Error-check and convert a string of mount options from user space into 1190 * a data structure. The whole mount string is processed; bad options are 1191 * skipped as they are encountered. If there were no errors, return 1; 1192 * otherwise return 0 (zero). 1193 */ 1194 static int nfs_parse_mount_options(char *raw, 1195 struct nfs_parsed_mount_data *mnt) 1196 { 1197 char *p, *string, *secdata; 1198 int rc, sloppy = 0, invalid_option = 0; 1199 unsigned short protofamily = AF_UNSPEC; 1200 unsigned short mountfamily = AF_UNSPEC; 1201 1202 if (!raw) { 1203 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1204 return 1; 1205 } 1206 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1207 1208 secdata = alloc_secdata(); 1209 if (!secdata) 1210 goto out_nomem; 1211 1212 rc = security_sb_copy_data(raw, secdata); 1213 if (rc) 1214 goto out_security_failure; 1215 1216 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1217 if (rc) 1218 goto out_security_failure; 1219 1220 free_secdata(secdata); 1221 1222 while ((p = strsep(&raw, ",")) != NULL) { 1223 substring_t args[MAX_OPT_ARGS]; 1224 unsigned long option; 1225 int token; 1226 1227 if (!*p) 1228 continue; 1229 1230 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1231 1232 token = match_token(p, nfs_mount_option_tokens, args); 1233 switch (token) { 1234 1235 /* 1236 * boolean options: foo/nofoo 1237 */ 1238 case Opt_soft: 1239 mnt->flags |= NFS_MOUNT_SOFT; 1240 break; 1241 case Opt_hard: 1242 mnt->flags &= ~NFS_MOUNT_SOFT; 1243 break; 1244 case Opt_posix: 1245 mnt->flags |= NFS_MOUNT_POSIX; 1246 break; 1247 case Opt_noposix: 1248 mnt->flags &= ~NFS_MOUNT_POSIX; 1249 break; 1250 case Opt_cto: 1251 mnt->flags &= ~NFS_MOUNT_NOCTO; 1252 break; 1253 case Opt_nocto: 1254 mnt->flags |= NFS_MOUNT_NOCTO; 1255 break; 1256 case Opt_ac: 1257 mnt->flags &= ~NFS_MOUNT_NOAC; 1258 break; 1259 case Opt_noac: 1260 mnt->flags |= NFS_MOUNT_NOAC; 1261 break; 1262 case Opt_lock: 1263 mnt->flags &= ~NFS_MOUNT_NONLM; 1264 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1265 NFS_MOUNT_LOCAL_FCNTL); 1266 break; 1267 case Opt_nolock: 1268 mnt->flags |= NFS_MOUNT_NONLM; 1269 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1270 NFS_MOUNT_LOCAL_FCNTL); 1271 break; 1272 case Opt_udp: 1273 mnt->flags &= ~NFS_MOUNT_TCP; 1274 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1275 break; 1276 case Opt_tcp: 1277 mnt->flags |= NFS_MOUNT_TCP; 1278 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1279 break; 1280 case Opt_rdma: 1281 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1282 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1283 xprt_load_transport(p); 1284 break; 1285 case Opt_acl: 1286 mnt->flags &= ~NFS_MOUNT_NOACL; 1287 break; 1288 case Opt_noacl: 1289 mnt->flags |= NFS_MOUNT_NOACL; 1290 break; 1291 case Opt_rdirplus: 1292 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1293 break; 1294 case Opt_nordirplus: 1295 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1296 break; 1297 case Opt_sharecache: 1298 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1299 break; 1300 case Opt_nosharecache: 1301 mnt->flags |= NFS_MOUNT_UNSHARED; 1302 break; 1303 case Opt_resvport: 1304 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1305 break; 1306 case Opt_noresvport: 1307 mnt->flags |= NFS_MOUNT_NORESVPORT; 1308 break; 1309 case Opt_fscache: 1310 mnt->options |= NFS_OPTION_FSCACHE; 1311 kfree(mnt->fscache_uniq); 1312 mnt->fscache_uniq = NULL; 1313 break; 1314 case Opt_nofscache: 1315 mnt->options &= ~NFS_OPTION_FSCACHE; 1316 kfree(mnt->fscache_uniq); 1317 mnt->fscache_uniq = NULL; 1318 break; 1319 case Opt_migration: 1320 mnt->options |= NFS_OPTION_MIGRATION; 1321 break; 1322 case Opt_nomigration: 1323 mnt->options &= NFS_OPTION_MIGRATION; 1324 break; 1325 1326 /* 1327 * options that take numeric values 1328 */ 1329 case Opt_port: 1330 if (nfs_get_option_ul(args, &option) || 1331 option > USHRT_MAX) 1332 goto out_invalid_value; 1333 mnt->nfs_server.port = option; 1334 break; 1335 case Opt_rsize: 1336 if (nfs_get_option_ul(args, &option)) 1337 goto out_invalid_value; 1338 mnt->rsize = option; 1339 break; 1340 case Opt_wsize: 1341 if (nfs_get_option_ul(args, &option)) 1342 goto out_invalid_value; 1343 mnt->wsize = option; 1344 break; 1345 case Opt_bsize: 1346 if (nfs_get_option_ul(args, &option)) 1347 goto out_invalid_value; 1348 mnt->bsize = option; 1349 break; 1350 case Opt_timeo: 1351 if (nfs_get_option_ul(args, &option) || option == 0) 1352 goto out_invalid_value; 1353 mnt->timeo = option; 1354 break; 1355 case Opt_retrans: 1356 if (nfs_get_option_ul(args, &option) || option == 0) 1357 goto out_invalid_value; 1358 mnt->retrans = option; 1359 break; 1360 case Opt_acregmin: 1361 if (nfs_get_option_ul(args, &option)) 1362 goto out_invalid_value; 1363 mnt->acregmin = option; 1364 break; 1365 case Opt_acregmax: 1366 if (nfs_get_option_ul(args, &option)) 1367 goto out_invalid_value; 1368 mnt->acregmax = option; 1369 break; 1370 case Opt_acdirmin: 1371 if (nfs_get_option_ul(args, &option)) 1372 goto out_invalid_value; 1373 mnt->acdirmin = option; 1374 break; 1375 case Opt_acdirmax: 1376 if (nfs_get_option_ul(args, &option)) 1377 goto out_invalid_value; 1378 mnt->acdirmax = option; 1379 break; 1380 case Opt_actimeo: 1381 if (nfs_get_option_ul(args, &option)) 1382 goto out_invalid_value; 1383 mnt->acregmin = mnt->acregmax = 1384 mnt->acdirmin = mnt->acdirmax = option; 1385 break; 1386 case Opt_namelen: 1387 if (nfs_get_option_ul(args, &option)) 1388 goto out_invalid_value; 1389 mnt->namlen = option; 1390 break; 1391 case Opt_mountport: 1392 if (nfs_get_option_ul(args, &option) || 1393 option > USHRT_MAX) 1394 goto out_invalid_value; 1395 mnt->mount_server.port = option; 1396 break; 1397 case Opt_mountvers: 1398 if (nfs_get_option_ul(args, &option) || 1399 option < NFS_MNT_VERSION || 1400 option > NFS_MNT3_VERSION) 1401 goto out_invalid_value; 1402 mnt->mount_server.version = option; 1403 break; 1404 case Opt_minorversion: 1405 if (nfs_get_option_ul(args, &option)) 1406 goto out_invalid_value; 1407 if (option > NFS4_MAX_MINOR_VERSION) 1408 goto out_invalid_value; 1409 mnt->minorversion = option; 1410 break; 1411 1412 /* 1413 * options that take text values 1414 */ 1415 case Opt_nfsvers: 1416 string = match_strdup(args); 1417 if (string == NULL) 1418 goto out_nomem; 1419 rc = nfs_parse_version_string(string, mnt, args); 1420 kfree(string); 1421 if (!rc) 1422 goto out_invalid_value; 1423 break; 1424 case Opt_sec: 1425 string = match_strdup(args); 1426 if (string == NULL) 1427 goto out_nomem; 1428 rc = nfs_parse_security_flavors(string, mnt); 1429 kfree(string); 1430 if (!rc) { 1431 dfprintk(MOUNT, "NFS: unrecognized " 1432 "security flavor\n"); 1433 return 0; 1434 } 1435 break; 1436 case Opt_proto: 1437 string = match_strdup(args); 1438 if (string == NULL) 1439 goto out_nomem; 1440 token = match_token(string, 1441 nfs_xprt_protocol_tokens, args); 1442 1443 protofamily = AF_INET; 1444 switch (token) { 1445 case Opt_xprt_udp6: 1446 protofamily = AF_INET6; 1447 case Opt_xprt_udp: 1448 mnt->flags &= ~NFS_MOUNT_TCP; 1449 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1450 break; 1451 case Opt_xprt_tcp6: 1452 protofamily = AF_INET6; 1453 case Opt_xprt_tcp: 1454 mnt->flags |= NFS_MOUNT_TCP; 1455 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1456 break; 1457 case Opt_xprt_rdma: 1458 /* vector side protocols to TCP */ 1459 mnt->flags |= NFS_MOUNT_TCP; 1460 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1461 xprt_load_transport(string); 1462 break; 1463 default: 1464 dfprintk(MOUNT, "NFS: unrecognized " 1465 "transport protocol\n"); 1466 kfree(string); 1467 return 0; 1468 } 1469 kfree(string); 1470 break; 1471 case Opt_mountproto: 1472 string = match_strdup(args); 1473 if (string == NULL) 1474 goto out_nomem; 1475 token = match_token(string, 1476 nfs_xprt_protocol_tokens, args); 1477 kfree(string); 1478 1479 mountfamily = AF_INET; 1480 switch (token) { 1481 case Opt_xprt_udp6: 1482 mountfamily = AF_INET6; 1483 case Opt_xprt_udp: 1484 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1485 break; 1486 case Opt_xprt_tcp6: 1487 mountfamily = AF_INET6; 1488 case Opt_xprt_tcp: 1489 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1490 break; 1491 case Opt_xprt_rdma: /* not used for side protocols */ 1492 default: 1493 dfprintk(MOUNT, "NFS: unrecognized " 1494 "transport protocol\n"); 1495 return 0; 1496 } 1497 break; 1498 case Opt_addr: 1499 string = match_strdup(args); 1500 if (string == NULL) 1501 goto out_nomem; 1502 mnt->nfs_server.addrlen = 1503 rpc_pton(mnt->net, string, strlen(string), 1504 (struct sockaddr *) 1505 &mnt->nfs_server.address, 1506 sizeof(mnt->nfs_server.address)); 1507 kfree(string); 1508 if (mnt->nfs_server.addrlen == 0) 1509 goto out_invalid_address; 1510 break; 1511 case Opt_clientaddr: 1512 if (nfs_get_option_str(args, &mnt->client_address)) 1513 goto out_nomem; 1514 break; 1515 case Opt_mounthost: 1516 if (nfs_get_option_str(args, 1517 &mnt->mount_server.hostname)) 1518 goto out_nomem; 1519 break; 1520 case Opt_mountaddr: 1521 string = match_strdup(args); 1522 if (string == NULL) 1523 goto out_nomem; 1524 mnt->mount_server.addrlen = 1525 rpc_pton(mnt->net, string, strlen(string), 1526 (struct sockaddr *) 1527 &mnt->mount_server.address, 1528 sizeof(mnt->mount_server.address)); 1529 kfree(string); 1530 if (mnt->mount_server.addrlen == 0) 1531 goto out_invalid_address; 1532 break; 1533 case Opt_lookupcache: 1534 string = match_strdup(args); 1535 if (string == NULL) 1536 goto out_nomem; 1537 token = match_token(string, 1538 nfs_lookupcache_tokens, args); 1539 kfree(string); 1540 switch (token) { 1541 case Opt_lookupcache_all: 1542 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1543 break; 1544 case Opt_lookupcache_positive: 1545 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1546 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1547 break; 1548 case Opt_lookupcache_none: 1549 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1550 break; 1551 default: 1552 dfprintk(MOUNT, "NFS: invalid " 1553 "lookupcache argument\n"); 1554 return 0; 1555 }; 1556 break; 1557 case Opt_fscache_uniq: 1558 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1559 goto out_nomem; 1560 mnt->options |= NFS_OPTION_FSCACHE; 1561 break; 1562 case Opt_local_lock: 1563 string = match_strdup(args); 1564 if (string == NULL) 1565 goto out_nomem; 1566 token = match_token(string, nfs_local_lock_tokens, 1567 args); 1568 kfree(string); 1569 switch (token) { 1570 case Opt_local_lock_all: 1571 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1572 NFS_MOUNT_LOCAL_FCNTL); 1573 break; 1574 case Opt_local_lock_flock: 1575 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1576 break; 1577 case Opt_local_lock_posix: 1578 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1579 break; 1580 case Opt_local_lock_none: 1581 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1582 NFS_MOUNT_LOCAL_FCNTL); 1583 break; 1584 default: 1585 dfprintk(MOUNT, "NFS: invalid " 1586 "local_lock argument\n"); 1587 return 0; 1588 }; 1589 break; 1590 1591 /* 1592 * Special options 1593 */ 1594 case Opt_sloppy: 1595 sloppy = 1; 1596 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1597 break; 1598 case Opt_userspace: 1599 case Opt_deprecated: 1600 dfprintk(MOUNT, "NFS: ignoring mount option " 1601 "'%s'\n", p); 1602 break; 1603 1604 default: 1605 invalid_option = 1; 1606 dfprintk(MOUNT, "NFS: unrecognized mount option " 1607 "'%s'\n", p); 1608 } 1609 } 1610 1611 if (!sloppy && invalid_option) 1612 return 0; 1613 1614 if (mnt->minorversion && mnt->version != 4) 1615 goto out_minorversion_mismatch; 1616 1617 if (mnt->options & NFS_OPTION_MIGRATION && 1618 (mnt->version != 4 || mnt->minorversion != 0)) 1619 goto out_migration_misuse; 1620 1621 /* 1622 * verify that any proto=/mountproto= options match the address 1623 * families in the addr=/mountaddr= options. 1624 */ 1625 if (protofamily != AF_UNSPEC && 1626 protofamily != mnt->nfs_server.address.ss_family) 1627 goto out_proto_mismatch; 1628 1629 if (mountfamily != AF_UNSPEC) { 1630 if (mnt->mount_server.addrlen) { 1631 if (mountfamily != mnt->mount_server.address.ss_family) 1632 goto out_mountproto_mismatch; 1633 } else { 1634 if (mountfamily != mnt->nfs_server.address.ss_family) 1635 goto out_mountproto_mismatch; 1636 } 1637 } 1638 1639 return 1; 1640 1641 out_mountproto_mismatch: 1642 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1643 "option\n"); 1644 return 0; 1645 out_proto_mismatch: 1646 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1647 return 0; 1648 out_invalid_address: 1649 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1650 return 0; 1651 out_invalid_value: 1652 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1653 return 0; 1654 out_minorversion_mismatch: 1655 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1656 "minorversion=%u\n", mnt->version, mnt->minorversion); 1657 return 0; 1658 out_migration_misuse: 1659 printk(KERN_INFO 1660 "NFS: 'migration' not supported for this NFS version\n"); 1661 return 0; 1662 out_nomem: 1663 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1664 return 0; 1665 out_security_failure: 1666 free_secdata(secdata); 1667 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1668 return 0; 1669 } 1670 1671 /* 1672 * Ensure that a specified authtype in args->auth_info is supported by 1673 * the server. Returns 0 and sets args->selected_flavor if it's ok, and 1674 * -EACCES if not. 1675 */ 1676 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args, 1677 rpc_authflavor_t *server_authlist, unsigned int count) 1678 { 1679 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 1680 unsigned int i; 1681 1682 /* 1683 * If the sec= mount option is used, the specified flavor or AUTH_NULL 1684 * must be in the list returned by the server. 1685 * 1686 * AUTH_NULL has a special meaning when it's in the server list - it 1687 * means that the server will ignore the rpc creds, so any flavor 1688 * can be used. 1689 */ 1690 for (i = 0; i < count; i++) { 1691 flavor = server_authlist[i]; 1692 1693 if (nfs_auth_info_match(&args->auth_info, flavor) || 1694 flavor == RPC_AUTH_NULL) 1695 goto out; 1696 } 1697 1698 dfprintk(MOUNT, 1699 "NFS: specified auth flavors not supported by server\n"); 1700 return -EACCES; 1701 1702 out: 1703 args->selected_flavor = flavor; 1704 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor); 1705 return 0; 1706 } 1707 1708 /* 1709 * Use the remote server's MOUNT service to request the NFS file handle 1710 * corresponding to the provided path. 1711 */ 1712 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1713 struct nfs_fh *root_fh, 1714 rpc_authflavor_t *server_authlist, 1715 unsigned int *server_authlist_len) 1716 { 1717 struct nfs_mount_request request = { 1718 .sap = (struct sockaddr *) 1719 &args->mount_server.address, 1720 .dirpath = args->nfs_server.export_path, 1721 .protocol = args->mount_server.protocol, 1722 .fh = root_fh, 1723 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1724 .auth_flav_len = server_authlist_len, 1725 .auth_flavs = server_authlist, 1726 .net = args->net, 1727 }; 1728 int status; 1729 1730 if (args->mount_server.version == 0) { 1731 switch (args->version) { 1732 default: 1733 args->mount_server.version = NFS_MNT3_VERSION; 1734 break; 1735 case 2: 1736 args->mount_server.version = NFS_MNT_VERSION; 1737 } 1738 } 1739 request.version = args->mount_server.version; 1740 1741 if (args->mount_server.hostname) 1742 request.hostname = args->mount_server.hostname; 1743 else 1744 request.hostname = args->nfs_server.hostname; 1745 1746 /* 1747 * Construct the mount server's address. 1748 */ 1749 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1750 memcpy(request.sap, &args->nfs_server.address, 1751 args->nfs_server.addrlen); 1752 args->mount_server.addrlen = args->nfs_server.addrlen; 1753 } 1754 request.salen = args->mount_server.addrlen; 1755 nfs_set_port(request.sap, &args->mount_server.port, 0); 1756 1757 /* 1758 * Now ask the mount server to map our export path 1759 * to a file handle. 1760 */ 1761 status = nfs_mount(&request); 1762 if (status != 0) { 1763 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1764 request.hostname, status); 1765 return status; 1766 } 1767 1768 return 0; 1769 } 1770 1771 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, 1772 struct nfs_subversion *nfs_mod) 1773 { 1774 int status; 1775 unsigned int i; 1776 bool tried_auth_unix = false; 1777 bool auth_null_in_list = false; 1778 struct nfs_server *server = ERR_PTR(-EACCES); 1779 struct nfs_parsed_mount_data *args = mount_info->parsed; 1780 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 1781 unsigned int authlist_len = ARRAY_SIZE(authlist); 1782 1783 status = nfs_request_mount(args, mount_info->mntfh, authlist, 1784 &authlist_len); 1785 if (status) 1786 return ERR_PTR(status); 1787 1788 /* 1789 * Was a sec= authflavor specified in the options? First, verify 1790 * whether the server supports it, and then just try to use it if so. 1791 */ 1792 if (args->auth_info.flavor_len > 0) { 1793 status = nfs_verify_authflavors(args, authlist, authlist_len); 1794 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 1795 args->selected_flavor); 1796 if (status) 1797 return ERR_PTR(status); 1798 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1799 } 1800 1801 /* 1802 * No sec= option was provided. RFC 2623, section 2.7 suggests we 1803 * SHOULD prefer the flavor listed first. However, some servers list 1804 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 1805 */ 1806 for (i = 0; i < authlist_len; ++i) { 1807 rpc_authflavor_t flavor; 1808 struct rpcsec_gss_info info; 1809 1810 flavor = authlist[i]; 1811 switch (flavor) { 1812 case RPC_AUTH_UNIX: 1813 tried_auth_unix = true; 1814 break; 1815 case RPC_AUTH_NULL: 1816 auth_null_in_list = true; 1817 continue; 1818 default: 1819 if (rpcauth_get_gssinfo(flavor, &info) != 0) 1820 continue; 1821 /* Fallthrough */ 1822 } 1823 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 1824 args->selected_flavor = flavor; 1825 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1826 if (!IS_ERR(server)) 1827 return server; 1828 } 1829 1830 /* 1831 * Nothing we tried so far worked. At this point, give up if we've 1832 * already tried AUTH_UNIX or if the server's list doesn't contain 1833 * AUTH_NULL 1834 */ 1835 if (tried_auth_unix || !auth_null_in_list) 1836 return server; 1837 1838 /* Last chance! Try AUTH_UNIX */ 1839 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 1840 args->selected_flavor = RPC_AUTH_UNIX; 1841 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1842 } 1843 1844 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1845 struct nfs_mount_info *mount_info, 1846 struct nfs_subversion *nfs_mod) 1847 { 1848 struct nfs_server *server; 1849 1850 if (mount_info->parsed->need_mount) 1851 server = nfs_try_mount_request(mount_info, nfs_mod); 1852 else 1853 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1854 1855 if (IS_ERR(server)) 1856 return ERR_CAST(server); 1857 1858 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1859 } 1860 EXPORT_SYMBOL_GPL(nfs_try_mount); 1861 1862 /* 1863 * Split "dev_name" into "hostname:export_path". 1864 * 1865 * The leftmost colon demarks the split between the server's hostname 1866 * and the export path. If the hostname starts with a left square 1867 * bracket, then it may contain colons. 1868 * 1869 * Note: caller frees hostname and export path, even on error. 1870 */ 1871 static int nfs_parse_devname(const char *dev_name, 1872 char **hostname, size_t maxnamlen, 1873 char **export_path, size_t maxpathlen) 1874 { 1875 size_t len; 1876 char *end; 1877 1878 /* Is the host name protected with square brakcets? */ 1879 if (*dev_name == '[') { 1880 end = strchr(++dev_name, ']'); 1881 if (end == NULL || end[1] != ':') 1882 goto out_bad_devname; 1883 1884 len = end - dev_name; 1885 end++; 1886 } else { 1887 char *comma; 1888 1889 end = strchr(dev_name, ':'); 1890 if (end == NULL) 1891 goto out_bad_devname; 1892 len = end - dev_name; 1893 1894 /* kill possible hostname list: not supported */ 1895 comma = strchr(dev_name, ','); 1896 if (comma != NULL && comma < end) 1897 *comma = 0; 1898 } 1899 1900 if (len > maxnamlen) 1901 goto out_hostname; 1902 1903 /* N.B. caller will free nfs_server.hostname in all cases */ 1904 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1905 if (*hostname == NULL) 1906 goto out_nomem; 1907 len = strlen(++end); 1908 if (len > maxpathlen) 1909 goto out_path; 1910 *export_path = kstrndup(end, len, GFP_KERNEL); 1911 if (!*export_path) 1912 goto out_nomem; 1913 1914 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1915 return 0; 1916 1917 out_bad_devname: 1918 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1919 return -EINVAL; 1920 1921 out_nomem: 1922 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1923 return -ENOMEM; 1924 1925 out_hostname: 1926 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1927 return -ENAMETOOLONG; 1928 1929 out_path: 1930 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1931 return -ENAMETOOLONG; 1932 } 1933 1934 /* 1935 * Validate the NFS2/NFS3 mount data 1936 * - fills in the mount root filehandle 1937 * 1938 * For option strings, user space handles the following behaviors: 1939 * 1940 * + DNS: mapping server host name to IP address ("addr=" option) 1941 * 1942 * + failure mode: how to behave if a mount request can't be handled 1943 * immediately ("fg/bg" option) 1944 * 1945 * + retry: how often to retry a mount request ("retry=" option) 1946 * 1947 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1948 * mountproto=tcp after mountproto=udp, and so on 1949 */ 1950 static int nfs23_validate_mount_data(void *options, 1951 struct nfs_parsed_mount_data *args, 1952 struct nfs_fh *mntfh, 1953 const char *dev_name) 1954 { 1955 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1956 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1957 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; 1958 1959 if (data == NULL) 1960 goto out_no_data; 1961 1962 args->version = NFS_DEFAULT_VERSION; 1963 switch (data->version) { 1964 case 1: 1965 data->namlen = 0; 1966 case 2: 1967 data->bsize = 0; 1968 case 3: 1969 if (data->flags & NFS_MOUNT_VER3) 1970 goto out_no_v3; 1971 data->root.size = NFS2_FHSIZE; 1972 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1973 /* Turn off security negotiation */ 1974 extra_flags |= NFS_MOUNT_SECFLAVOUR; 1975 case 4: 1976 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1977 goto out_no_sec; 1978 case 5: 1979 memset(data->context, 0, sizeof(data->context)); 1980 case 6: 1981 if (data->flags & NFS_MOUNT_VER3) { 1982 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1983 goto out_invalid_fh; 1984 mntfh->size = data->root.size; 1985 args->version = 3; 1986 } else { 1987 mntfh->size = NFS2_FHSIZE; 1988 args->version = 2; 1989 } 1990 1991 1992 memcpy(mntfh->data, data->root.data, mntfh->size); 1993 if (mntfh->size < sizeof(mntfh->data)) 1994 memset(mntfh->data + mntfh->size, 0, 1995 sizeof(mntfh->data) - mntfh->size); 1996 1997 /* 1998 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1999 * can deal with. 2000 */ 2001 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 2002 args->flags |= extra_flags; 2003 args->rsize = data->rsize; 2004 args->wsize = data->wsize; 2005 args->timeo = data->timeo; 2006 args->retrans = data->retrans; 2007 args->acregmin = data->acregmin; 2008 args->acregmax = data->acregmax; 2009 args->acdirmin = data->acdirmin; 2010 args->acdirmax = data->acdirmax; 2011 args->need_mount = false; 2012 2013 memcpy(sap, &data->addr, sizeof(data->addr)); 2014 args->nfs_server.addrlen = sizeof(data->addr); 2015 args->nfs_server.port = ntohs(data->addr.sin_port); 2016 if (!nfs_verify_server_address(sap)) 2017 goto out_no_address; 2018 2019 if (!(data->flags & NFS_MOUNT_TCP)) 2020 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 2021 /* N.B. caller will free nfs_server.hostname in all cases */ 2022 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 2023 args->namlen = data->namlen; 2024 args->bsize = data->bsize; 2025 2026 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2027 args->selected_flavor = data->pseudoflavor; 2028 else 2029 args->selected_flavor = RPC_AUTH_UNIX; 2030 if (!args->nfs_server.hostname) 2031 goto out_nomem; 2032 2033 if (!(data->flags & NFS_MOUNT_NONLM)) 2034 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 2035 NFS_MOUNT_LOCAL_FCNTL); 2036 else 2037 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 2038 NFS_MOUNT_LOCAL_FCNTL); 2039 /* 2040 * The legacy version 6 binary mount data from userspace has a 2041 * field used only to transport selinux information into the 2042 * the kernel. To continue to support that functionality we 2043 * have a touch of selinux knowledge here in the NFS code. The 2044 * userspace code converted context=blah to just blah so we are 2045 * converting back to the full string selinux understands. 2046 */ 2047 if (data->context[0]){ 2048 #ifdef CONFIG_SECURITY_SELINUX 2049 int rc; 2050 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 2051 if (!opts_str) 2052 return -ENOMEM; 2053 strcpy(opts_str, "context="); 2054 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 2055 strcat(opts_str, &data->context[0]); 2056 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 2057 kfree(opts_str); 2058 if (rc) 2059 return rc; 2060 #else 2061 return -EINVAL; 2062 #endif 2063 } 2064 2065 break; 2066 default: 2067 return NFS_TEXT_DATA; 2068 } 2069 2070 return 0; 2071 2072 out_no_data: 2073 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2074 return -EINVAL; 2075 2076 out_no_v3: 2077 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2078 data->version); 2079 return -EINVAL; 2080 2081 out_no_sec: 2082 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2083 return -EINVAL; 2084 2085 out_nomem: 2086 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2087 return -ENOMEM; 2088 2089 out_no_address: 2090 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2091 return -EINVAL; 2092 2093 out_invalid_fh: 2094 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2095 return -EINVAL; 2096 } 2097 2098 #if IS_ENABLED(CONFIG_NFS_V4) 2099 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2100 void *options, 2101 struct nfs_parsed_mount_data *args, 2102 struct nfs_fh *mntfh, 2103 const char *dev_name) 2104 { 2105 if (fs_type == &nfs_fs_type) 2106 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2107 return nfs4_validate_mount_data(options, args, dev_name); 2108 } 2109 #else 2110 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2111 void *options, 2112 struct nfs_parsed_mount_data *args, 2113 struct nfs_fh *mntfh, 2114 const char *dev_name) 2115 { 2116 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2117 } 2118 #endif 2119 2120 static int nfs_validate_text_mount_data(void *options, 2121 struct nfs_parsed_mount_data *args, 2122 const char *dev_name) 2123 { 2124 int port = 0; 2125 int max_namelen = PAGE_SIZE; 2126 int max_pathlen = NFS_MAXPATHLEN; 2127 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2128 2129 if (nfs_parse_mount_options((char *)options, args) == 0) 2130 return -EINVAL; 2131 2132 if (!nfs_verify_server_address(sap)) 2133 goto out_no_address; 2134 2135 if (args->version == 4) { 2136 #if IS_ENABLED(CONFIG_NFS_V4) 2137 port = NFS_PORT; 2138 max_namelen = NFS4_MAXNAMLEN; 2139 max_pathlen = NFS4_MAXPATHLEN; 2140 nfs_validate_transport_protocol(args); 2141 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2142 goto out_invalid_transport_udp; 2143 nfs4_validate_mount_flags(args); 2144 #else 2145 goto out_v4_not_compiled; 2146 #endif /* CONFIG_NFS_V4 */ 2147 } else 2148 nfs_set_mount_transport_protocol(args); 2149 2150 nfs_set_port(sap, &args->nfs_server.port, port); 2151 2152 return nfs_parse_devname(dev_name, 2153 &args->nfs_server.hostname, 2154 max_namelen, 2155 &args->nfs_server.export_path, 2156 max_pathlen); 2157 2158 #if !IS_ENABLED(CONFIG_NFS_V4) 2159 out_v4_not_compiled: 2160 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2161 return -EPROTONOSUPPORT; 2162 #else 2163 out_invalid_transport_udp: 2164 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2165 return -EINVAL; 2166 #endif /* !CONFIG_NFS_V4 */ 2167 2168 out_no_address: 2169 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2170 return -EINVAL; 2171 } 2172 2173 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 2174 | NFS_MOUNT_SECURE \ 2175 | NFS_MOUNT_TCP \ 2176 | NFS_MOUNT_VER3 \ 2177 | NFS_MOUNT_KERBEROS \ 2178 | NFS_MOUNT_NONLM \ 2179 | NFS_MOUNT_BROKEN_SUID \ 2180 | NFS_MOUNT_STRICTLOCK \ 2181 | NFS_MOUNT_LEGACY_INTERFACE) 2182 2183 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 2184 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 2185 2186 static int 2187 nfs_compare_remount_data(struct nfs_server *nfss, 2188 struct nfs_parsed_mount_data *data) 2189 { 2190 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 2191 data->rsize != nfss->rsize || 2192 data->wsize != nfss->wsize || 2193 data->version != nfss->nfs_client->rpc_ops->version || 2194 data->minorversion != nfss->nfs_client->cl_minorversion || 2195 data->retrans != nfss->client->cl_timeout->to_retries || 2196 data->selected_flavor != nfss->client->cl_auth->au_flavor || 2197 data->acregmin != nfss->acregmin / HZ || 2198 data->acregmax != nfss->acregmax / HZ || 2199 data->acdirmin != nfss->acdirmin / HZ || 2200 data->acdirmax != nfss->acdirmax / HZ || 2201 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2202 data->nfs_server.port != nfss->port || 2203 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2204 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2205 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2206 return -EINVAL; 2207 2208 return 0; 2209 } 2210 2211 int 2212 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2213 { 2214 int error; 2215 struct nfs_server *nfss = sb->s_fs_info; 2216 struct nfs_parsed_mount_data *data; 2217 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2218 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2219 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2220 2221 sync_filesystem(sb); 2222 2223 /* 2224 * Userspace mount programs that send binary options generally send 2225 * them populated with default values. We have no way to know which 2226 * ones were explicitly specified. Fall back to legacy behavior and 2227 * just return success. 2228 */ 2229 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2230 (nfsvers <= 3 && (!options || (options->version >= 1 && 2231 options->version <= 6)))) 2232 return 0; 2233 2234 data = kzalloc(sizeof(*data), GFP_KERNEL); 2235 if (data == NULL) 2236 return -ENOMEM; 2237 2238 /* fill out struct with values from existing mount */ 2239 data->flags = nfss->flags; 2240 data->rsize = nfss->rsize; 2241 data->wsize = nfss->wsize; 2242 data->retrans = nfss->client->cl_timeout->to_retries; 2243 data->selected_flavor = nfss->client->cl_auth->au_flavor; 2244 data->auth_info = nfss->auth_info; 2245 data->acregmin = nfss->acregmin / HZ; 2246 data->acregmax = nfss->acregmax / HZ; 2247 data->acdirmin = nfss->acdirmin / HZ; 2248 data->acdirmax = nfss->acdirmax / HZ; 2249 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2250 data->nfs_server.port = nfss->port; 2251 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2252 data->version = nfsvers; 2253 data->minorversion = nfss->nfs_client->cl_minorversion; 2254 data->net = current->nsproxy->net_ns; 2255 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2256 data->nfs_server.addrlen); 2257 2258 /* overwrite those values with any that were specified */ 2259 error = -EINVAL; 2260 if (!nfs_parse_mount_options((char *)options, data)) 2261 goto out; 2262 2263 /* 2264 * noac is a special case. It implies -o sync, but that's not 2265 * necessarily reflected in the mtab options. do_remount_sb 2266 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2267 * remount options, so we have to explicitly reset it. 2268 */ 2269 if (data->flags & NFS_MOUNT_NOAC) 2270 *flags |= MS_SYNCHRONOUS; 2271 2272 /* compare new mount options with old ones */ 2273 error = nfs_compare_remount_data(nfss, data); 2274 out: 2275 kfree(data); 2276 return error; 2277 } 2278 EXPORT_SYMBOL_GPL(nfs_remount); 2279 2280 /* 2281 * Initialise the common bits of the superblock 2282 */ 2283 inline void nfs_initialise_sb(struct super_block *sb) 2284 { 2285 struct nfs_server *server = NFS_SB(sb); 2286 2287 sb->s_magic = NFS_SUPER_MAGIC; 2288 2289 /* We probably want something more informative here */ 2290 snprintf(sb->s_id, sizeof(sb->s_id), 2291 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2292 2293 if (sb->s_blocksize == 0) 2294 sb->s_blocksize = nfs_block_bits(server->wsize, 2295 &sb->s_blocksize_bits); 2296 2297 sb->s_bdi = &server->backing_dev_info; 2298 2299 nfs_super_set_maxbytes(sb, server->maxfilesize); 2300 } 2301 2302 /* 2303 * Finish setting up an NFS2/3 superblock 2304 */ 2305 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2306 { 2307 struct nfs_parsed_mount_data *data = mount_info->parsed; 2308 struct nfs_server *server = NFS_SB(sb); 2309 2310 sb->s_blocksize_bits = 0; 2311 sb->s_blocksize = 0; 2312 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2313 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2314 if (data && data->bsize) 2315 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2316 2317 if (server->nfs_client->rpc_ops->version != 2) { 2318 /* The VFS shouldn't apply the umask to mode bits. We will do 2319 * so ourselves when necessary. 2320 */ 2321 sb->s_flags |= MS_POSIXACL; 2322 sb->s_time_gran = 1; 2323 } 2324 2325 nfs_initialise_sb(sb); 2326 } 2327 EXPORT_SYMBOL_GPL(nfs_fill_super); 2328 2329 /* 2330 * Finish setting up a cloned NFS2/3/4 superblock 2331 */ 2332 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2333 { 2334 const struct super_block *old_sb = mount_info->cloned->sb; 2335 struct nfs_server *server = NFS_SB(sb); 2336 2337 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2338 sb->s_blocksize = old_sb->s_blocksize; 2339 sb->s_maxbytes = old_sb->s_maxbytes; 2340 sb->s_xattr = old_sb->s_xattr; 2341 sb->s_op = old_sb->s_op; 2342 sb->s_time_gran = 1; 2343 2344 if (server->nfs_client->rpc_ops->version != 2) { 2345 /* The VFS shouldn't apply the umask to mode bits. We will do 2346 * so ourselves when necessary. 2347 */ 2348 sb->s_flags |= MS_POSIXACL; 2349 } 2350 2351 nfs_initialise_sb(sb); 2352 } 2353 2354 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2355 { 2356 const struct nfs_server *a = s->s_fs_info; 2357 const struct rpc_clnt *clnt_a = a->client; 2358 const struct rpc_clnt *clnt_b = b->client; 2359 2360 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2361 goto Ebusy; 2362 if (a->nfs_client != b->nfs_client) 2363 goto Ebusy; 2364 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 2365 goto Ebusy; 2366 if (a->wsize != b->wsize) 2367 goto Ebusy; 2368 if (a->rsize != b->rsize) 2369 goto Ebusy; 2370 if (a->acregmin != b->acregmin) 2371 goto Ebusy; 2372 if (a->acregmax != b->acregmax) 2373 goto Ebusy; 2374 if (a->acdirmin != b->acdirmin) 2375 goto Ebusy; 2376 if (a->acdirmax != b->acdirmax) 2377 goto Ebusy; 2378 if (b->auth_info.flavor_len > 0 && 2379 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2380 goto Ebusy; 2381 return 1; 2382 Ebusy: 2383 return 0; 2384 } 2385 2386 struct nfs_sb_mountdata { 2387 struct nfs_server *server; 2388 int mntflags; 2389 }; 2390 2391 static int nfs_set_super(struct super_block *s, void *data) 2392 { 2393 struct nfs_sb_mountdata *sb_mntdata = data; 2394 struct nfs_server *server = sb_mntdata->server; 2395 int ret; 2396 2397 s->s_flags = sb_mntdata->mntflags; 2398 s->s_fs_info = server; 2399 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2400 ret = set_anon_super(s, server); 2401 if (ret == 0) 2402 server->s_dev = s->s_dev; 2403 return ret; 2404 } 2405 2406 static int nfs_compare_super_address(struct nfs_server *server1, 2407 struct nfs_server *server2) 2408 { 2409 struct sockaddr *sap1, *sap2; 2410 2411 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2412 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2413 2414 if (sap1->sa_family != sap2->sa_family) 2415 return 0; 2416 2417 switch (sap1->sa_family) { 2418 case AF_INET: { 2419 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2420 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2421 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2422 return 0; 2423 if (sin1->sin_port != sin2->sin_port) 2424 return 0; 2425 break; 2426 } 2427 case AF_INET6: { 2428 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2429 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2430 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2431 return 0; 2432 if (sin1->sin6_port != sin2->sin6_port) 2433 return 0; 2434 break; 2435 } 2436 default: 2437 return 0; 2438 } 2439 2440 return 1; 2441 } 2442 2443 static int nfs_compare_super(struct super_block *sb, void *data) 2444 { 2445 struct nfs_sb_mountdata *sb_mntdata = data; 2446 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2447 int mntflags = sb_mntdata->mntflags; 2448 2449 if (!nfs_compare_super_address(old, server)) 2450 return 0; 2451 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2452 if (old->flags & NFS_MOUNT_UNSHARED) 2453 return 0; 2454 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2455 return 0; 2456 return nfs_compare_mount_options(sb, server, mntflags); 2457 } 2458 2459 #ifdef CONFIG_NFS_FSCACHE 2460 static void nfs_get_cache_cookie(struct super_block *sb, 2461 struct nfs_parsed_mount_data *parsed, 2462 struct nfs_clone_mount *cloned) 2463 { 2464 struct nfs_server *nfss = NFS_SB(sb); 2465 char *uniq = NULL; 2466 int ulen = 0; 2467 2468 nfss->fscache_key = NULL; 2469 nfss->fscache = NULL; 2470 2471 if (parsed) { 2472 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2473 return; 2474 if (parsed->fscache_uniq) { 2475 uniq = parsed->fscache_uniq; 2476 ulen = strlen(parsed->fscache_uniq); 2477 } 2478 } else if (cloned) { 2479 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2480 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2481 return; 2482 if (mnt_s->fscache_key) { 2483 uniq = mnt_s->fscache_key->key.uniquifier; 2484 ulen = mnt_s->fscache_key->key.uniq_len; 2485 }; 2486 } else 2487 return; 2488 2489 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2490 } 2491 #else 2492 static void nfs_get_cache_cookie(struct super_block *sb, 2493 struct nfs_parsed_mount_data *parsed, 2494 struct nfs_clone_mount *cloned) 2495 { 2496 } 2497 #endif 2498 2499 static int nfs_bdi_register(struct nfs_server *server) 2500 { 2501 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2502 } 2503 2504 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2505 struct nfs_mount_info *mount_info) 2506 { 2507 int error; 2508 unsigned long kflags = 0, kflags_out = 0; 2509 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2510 kflags |= SECURITY_LSM_NATIVE_LABELS; 2511 2512 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts, 2513 kflags, &kflags_out); 2514 if (error) 2515 goto err; 2516 2517 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2518 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2519 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2520 err: 2521 return error; 2522 } 2523 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2524 2525 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2526 struct nfs_mount_info *mount_info) 2527 { 2528 /* clone any lsm security options from the parent to the new sb */ 2529 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2530 return -ESTALE; 2531 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2532 } 2533 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2534 2535 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2536 int flags, const char *dev_name, 2537 struct nfs_mount_info *mount_info, 2538 struct nfs_subversion *nfs_mod) 2539 { 2540 struct super_block *s; 2541 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2542 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2543 struct nfs_sb_mountdata sb_mntdata = { 2544 .mntflags = flags, 2545 .server = server, 2546 }; 2547 int error; 2548 2549 if (server->flags & NFS_MOUNT_UNSHARED) 2550 compare_super = NULL; 2551 2552 /* -o noac implies -o sync */ 2553 if (server->flags & NFS_MOUNT_NOAC) 2554 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2555 2556 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) 2557 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS) 2558 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2559 2560 /* Get a superblock - note that we may end up sharing one that already exists */ 2561 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2562 if (IS_ERR(s)) { 2563 mntroot = ERR_CAST(s); 2564 goto out_err_nosb; 2565 } 2566 2567 if (s->s_fs_info != server) { 2568 nfs_free_server(server); 2569 server = NULL; 2570 } else { 2571 error = nfs_bdi_register(server); 2572 if (error) { 2573 mntroot = ERR_PTR(error); 2574 goto error_splat_super; 2575 } 2576 server->super = s; 2577 } 2578 2579 if (!s->s_root) { 2580 /* initial superblock/root creation */ 2581 mount_info->fill_super(s, mount_info); 2582 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2583 } 2584 2585 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2586 if (IS_ERR(mntroot)) 2587 goto error_splat_super; 2588 2589 error = mount_info->set_security(s, mntroot, mount_info); 2590 if (error) 2591 goto error_splat_root; 2592 2593 s->s_flags |= MS_ACTIVE; 2594 2595 out: 2596 return mntroot; 2597 2598 out_err_nosb: 2599 nfs_free_server(server); 2600 goto out; 2601 2602 error_splat_root: 2603 dput(mntroot); 2604 mntroot = ERR_PTR(error); 2605 error_splat_super: 2606 deactivate_locked_super(s); 2607 goto out; 2608 } 2609 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2610 2611 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2612 int flags, const char *dev_name, void *raw_data) 2613 { 2614 struct nfs_mount_info mount_info = { 2615 .fill_super = nfs_fill_super, 2616 .set_security = nfs_set_sb_security, 2617 }; 2618 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2619 struct nfs_subversion *nfs_mod; 2620 int error; 2621 2622 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2623 mount_info.mntfh = nfs_alloc_fhandle(); 2624 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2625 goto out; 2626 2627 /* Validate the mount data */ 2628 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2629 if (error == NFS_TEXT_DATA) 2630 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2631 if (error < 0) { 2632 mntroot = ERR_PTR(error); 2633 goto out; 2634 } 2635 2636 nfs_mod = get_nfs_version(mount_info.parsed->version); 2637 if (IS_ERR(nfs_mod)) { 2638 mntroot = ERR_CAST(nfs_mod); 2639 goto out; 2640 } 2641 2642 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2643 2644 put_nfs_version(nfs_mod); 2645 out: 2646 nfs_free_parsed_mount_data(mount_info.parsed); 2647 nfs_free_fhandle(mount_info.mntfh); 2648 return mntroot; 2649 } 2650 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2651 2652 /* 2653 * Destroy an NFS2/3 superblock 2654 */ 2655 void nfs_kill_super(struct super_block *s) 2656 { 2657 struct nfs_server *server = NFS_SB(s); 2658 dev_t dev = s->s_dev; 2659 2660 generic_shutdown_super(s); 2661 2662 nfs_fscache_release_super_cookie(s); 2663 2664 nfs_free_server(server); 2665 free_anon_bdev(dev); 2666 } 2667 EXPORT_SYMBOL_GPL(nfs_kill_super); 2668 2669 /* 2670 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2671 */ 2672 static struct dentry * 2673 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2674 const char *dev_name, void *raw_data) 2675 { 2676 struct nfs_clone_mount *data = raw_data; 2677 struct nfs_mount_info mount_info = { 2678 .fill_super = nfs_clone_super, 2679 .set_security = nfs_clone_sb_security, 2680 .cloned = data, 2681 }; 2682 struct nfs_server *server; 2683 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2684 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2685 2686 dprintk("--> nfs_xdev_mount()\n"); 2687 2688 mount_info.mntfh = mount_info.cloned->fh; 2689 2690 /* create a new volume representation */ 2691 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2692 2693 if (IS_ERR(server)) 2694 mntroot = ERR_CAST(server); 2695 else 2696 mntroot = nfs_fs_mount_common(server, flags, 2697 dev_name, &mount_info, nfs_mod); 2698 2699 dprintk("<-- nfs_xdev_mount() = %ld\n", 2700 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2701 return mntroot; 2702 } 2703 2704 #if IS_ENABLED(CONFIG_NFS_V4) 2705 2706 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2707 { 2708 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2709 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2710 } 2711 2712 /* 2713 * Validate NFSv4 mount options 2714 */ 2715 static int nfs4_validate_mount_data(void *options, 2716 struct nfs_parsed_mount_data *args, 2717 const char *dev_name) 2718 { 2719 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2720 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2721 char *c; 2722 2723 if (data == NULL) 2724 goto out_no_data; 2725 2726 args->version = 4; 2727 2728 switch (data->version) { 2729 case 1: 2730 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2731 goto out_no_address; 2732 if (data->host_addrlen == 0) 2733 goto out_no_address; 2734 args->nfs_server.addrlen = data->host_addrlen; 2735 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2736 return -EFAULT; 2737 if (!nfs_verify_server_address(sap)) 2738 goto out_no_address; 2739 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2740 2741 if (data->auth_flavourlen) { 2742 rpc_authflavor_t pseudoflavor; 2743 if (data->auth_flavourlen > 1) 2744 goto out_inval_auth; 2745 if (copy_from_user(&pseudoflavor, 2746 data->auth_flavours, 2747 sizeof(pseudoflavor))) 2748 return -EFAULT; 2749 args->selected_flavor = pseudoflavor; 2750 } else 2751 args->selected_flavor = RPC_AUTH_UNIX; 2752 2753 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2754 if (IS_ERR(c)) 2755 return PTR_ERR(c); 2756 args->nfs_server.hostname = c; 2757 2758 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2759 if (IS_ERR(c)) 2760 return PTR_ERR(c); 2761 args->nfs_server.export_path = c; 2762 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2763 2764 c = strndup_user(data->client_addr.data, 16); 2765 if (IS_ERR(c)) 2766 return PTR_ERR(c); 2767 args->client_address = c; 2768 2769 /* 2770 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2771 * can deal with. 2772 */ 2773 2774 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2775 args->rsize = data->rsize; 2776 args->wsize = data->wsize; 2777 args->timeo = data->timeo; 2778 args->retrans = data->retrans; 2779 args->acregmin = data->acregmin; 2780 args->acregmax = data->acregmax; 2781 args->acdirmin = data->acdirmin; 2782 args->acdirmax = data->acdirmax; 2783 args->nfs_server.protocol = data->proto; 2784 nfs_validate_transport_protocol(args); 2785 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2786 goto out_invalid_transport_udp; 2787 2788 break; 2789 default: 2790 return NFS_TEXT_DATA; 2791 } 2792 2793 return 0; 2794 2795 out_no_data: 2796 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2797 return -EINVAL; 2798 2799 out_inval_auth: 2800 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2801 data->auth_flavourlen); 2802 return -EINVAL; 2803 2804 out_no_address: 2805 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2806 return -EINVAL; 2807 2808 out_invalid_transport_udp: 2809 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2810 return -EINVAL; 2811 } 2812 2813 /* 2814 * NFS v4 module parameters need to stay in the 2815 * NFS client for backwards compatibility 2816 */ 2817 unsigned int nfs_callback_set_tcpport; 2818 unsigned short nfs_callback_tcpport; 2819 /* Default cache timeout is 10 minutes */ 2820 unsigned int nfs_idmap_cache_timeout = 600; 2821 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2822 bool nfs4_disable_idmapping = true; 2823 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2824 unsigned short send_implementation_id = 1; 2825 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2826 bool recover_lost_locks = false; 2827 2828 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2829 EXPORT_SYMBOL_GPL(nfs_callback_tcpport); 2830 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2831 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2832 EXPORT_SYMBOL_GPL(max_session_slots); 2833 EXPORT_SYMBOL_GPL(send_implementation_id); 2834 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2835 EXPORT_SYMBOL_GPL(recover_lost_locks); 2836 2837 #define NFS_CALLBACK_MAXPORTNR (65535U) 2838 2839 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2840 { 2841 unsigned long num; 2842 int ret; 2843 2844 if (!val) 2845 return -EINVAL; 2846 ret = kstrtoul(val, 0, &num); 2847 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2848 return -EINVAL; 2849 *((unsigned int *)kp->arg) = num; 2850 return 0; 2851 } 2852 static struct kernel_param_ops param_ops_portnr = { 2853 .set = param_set_portnr, 2854 .get = param_get_uint, 2855 }; 2856 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2857 2858 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2859 module_param(nfs_idmap_cache_timeout, int, 0644); 2860 module_param(nfs4_disable_idmapping, bool, 0644); 2861 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2862 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2863 MODULE_PARM_DESC(nfs4_disable_idmapping, 2864 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2865 module_param(max_session_slots, ushort, 0644); 2866 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2867 "requests the client will negotiate"); 2868 module_param(send_implementation_id, ushort, 0644); 2869 MODULE_PARM_DESC(send_implementation_id, 2870 "Send implementation ID with NFSv4.1 exchange_id"); 2871 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2872 2873 module_param(recover_lost_locks, bool, 0644); 2874 MODULE_PARM_DESC(recover_lost_locks, 2875 "If the server reports that a lock might be lost, " 2876 "try to recover it risking data corruption."); 2877 2878 2879 #endif /* CONFIG_NFS_V4 */ 2880