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 .put_super = nfs_put_super, 315 .statfs = nfs_statfs, 316 .evict_inode = nfs_evict_inode, 317 .umount_begin = nfs_umount_begin, 318 .show_options = nfs_show_options, 319 .show_devname = nfs_show_devname, 320 .show_path = nfs_show_path, 321 .show_stats = nfs_show_stats, 322 .remount_fs = nfs_remount, 323 }; 324 EXPORT_SYMBOL_GPL(nfs_sops); 325 326 #if IS_ENABLED(CONFIG_NFS_V4) 327 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 328 static int nfs4_validate_mount_data(void *options, 329 struct nfs_parsed_mount_data *args, const char *dev_name); 330 331 struct file_system_type nfs4_fs_type = { 332 .owner = THIS_MODULE, 333 .name = "nfs4", 334 .mount = nfs_fs_mount, 335 .kill_sb = nfs_kill_super, 336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 337 }; 338 MODULE_ALIAS_FS("nfs4"); 339 MODULE_ALIAS("nfs4"); 340 EXPORT_SYMBOL_GPL(nfs4_fs_type); 341 342 static int __init register_nfs4_fs(void) 343 { 344 return register_filesystem(&nfs4_fs_type); 345 } 346 347 static void unregister_nfs4_fs(void) 348 { 349 unregister_filesystem(&nfs4_fs_type); 350 } 351 #else 352 static int __init register_nfs4_fs(void) 353 { 354 return 0; 355 } 356 357 static void unregister_nfs4_fs(void) 358 { 359 } 360 #endif 361 362 static struct shrinker acl_shrinker = { 363 .count_objects = nfs_access_cache_count, 364 .scan_objects = nfs_access_cache_scan, 365 .seeks = DEFAULT_SEEKS, 366 }; 367 368 /* 369 * Register the NFS filesystems 370 */ 371 int __init register_nfs_fs(void) 372 { 373 int ret; 374 375 ret = register_filesystem(&nfs_fs_type); 376 if (ret < 0) 377 goto error_0; 378 379 ret = register_nfs4_fs(); 380 if (ret < 0) 381 goto error_1; 382 383 ret = nfs_register_sysctl(); 384 if (ret < 0) 385 goto error_2; 386 register_shrinker(&acl_shrinker); 387 return 0; 388 389 error_2: 390 unregister_nfs4_fs(); 391 error_1: 392 unregister_filesystem(&nfs_fs_type); 393 error_0: 394 return ret; 395 } 396 397 /* 398 * Unregister the NFS filesystems 399 */ 400 void __exit unregister_nfs_fs(void) 401 { 402 unregister_shrinker(&acl_shrinker); 403 nfs_unregister_sysctl(); 404 unregister_nfs4_fs(); 405 unregister_filesystem(&nfs_fs_type); 406 } 407 408 void nfs_sb_active(struct super_block *sb) 409 { 410 struct nfs_server *server = NFS_SB(sb); 411 412 if (atomic_inc_return(&server->active) == 1) 413 atomic_inc(&sb->s_active); 414 } 415 EXPORT_SYMBOL_GPL(nfs_sb_active); 416 417 void nfs_sb_deactive(struct super_block *sb) 418 { 419 struct nfs_server *server = NFS_SB(sb); 420 421 if (atomic_dec_and_test(&server->active)) 422 deactivate_super(sb); 423 } 424 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 425 426 /* 427 * Deliver file system statistics to userspace 428 */ 429 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 430 { 431 struct nfs_server *server = NFS_SB(dentry->d_sb); 432 unsigned char blockbits; 433 unsigned long blockres; 434 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 435 struct nfs_fsstat res; 436 int error = -ENOMEM; 437 438 res.fattr = nfs_alloc_fattr(); 439 if (res.fattr == NULL) 440 goto out_err; 441 442 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 443 if (unlikely(error == -ESTALE)) { 444 struct dentry *pd_dentry; 445 446 pd_dentry = dget_parent(dentry); 447 if (pd_dentry != NULL) { 448 nfs_zap_caches(pd_dentry->d_inode); 449 dput(pd_dentry); 450 } 451 } 452 nfs_free_fattr(res.fattr); 453 if (error < 0) 454 goto out_err; 455 456 buf->f_type = NFS_SUPER_MAGIC; 457 458 /* 459 * Current versions of glibc do not correctly handle the 460 * case where f_frsize != f_bsize. Eventually we want to 461 * report the value of wtmult in this field. 462 */ 463 buf->f_frsize = dentry->d_sb->s_blocksize; 464 465 /* 466 * On most *nix systems, f_blocks, f_bfree, and f_bavail 467 * are reported in units of f_frsize. Linux hasn't had 468 * an f_frsize field in its statfs struct until recently, 469 * thus historically Linux's sys_statfs reports these 470 * fields in units of f_bsize. 471 */ 472 buf->f_bsize = dentry->d_sb->s_blocksize; 473 blockbits = dentry->d_sb->s_blocksize_bits; 474 blockres = (1 << blockbits) - 1; 475 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 476 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 477 buf->f_bavail = (res.abytes + blockres) >> blockbits; 478 479 buf->f_files = res.tfiles; 480 buf->f_ffree = res.afiles; 481 482 buf->f_namelen = server->namelen; 483 484 return 0; 485 486 out_err: 487 dprintk("%s: statfs error = %d\n", __func__, -error); 488 return error; 489 } 490 EXPORT_SYMBOL_GPL(nfs_statfs); 491 492 /* 493 * Map the security flavour number to a name 494 */ 495 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 496 { 497 static const struct { 498 rpc_authflavor_t flavour; 499 const char *str; 500 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { 501 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ 502 { RPC_AUTH_NULL, "null" }, 503 { RPC_AUTH_UNIX, "sys" }, 504 { RPC_AUTH_GSS_KRB5, "krb5" }, 505 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 506 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 507 { RPC_AUTH_GSS_LKEY, "lkey" }, 508 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 509 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 510 { RPC_AUTH_GSS_SPKM, "spkm" }, 511 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 512 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 513 { UINT_MAX, "unknown" } 514 }; 515 int i; 516 517 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 518 if (sec_flavours[i].flavour == flavour) 519 break; 520 } 521 return sec_flavours[i].str; 522 } 523 524 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 525 int showdefaults) 526 { 527 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 528 529 seq_printf(m, ",mountproto="); 530 switch (sap->sa_family) { 531 case AF_INET: 532 switch (nfss->mountd_protocol) { 533 case IPPROTO_UDP: 534 seq_printf(m, RPCBIND_NETID_UDP); 535 break; 536 case IPPROTO_TCP: 537 seq_printf(m, RPCBIND_NETID_TCP); 538 break; 539 default: 540 if (showdefaults) 541 seq_printf(m, "auto"); 542 } 543 break; 544 case AF_INET6: 545 switch (nfss->mountd_protocol) { 546 case IPPROTO_UDP: 547 seq_printf(m, RPCBIND_NETID_UDP6); 548 break; 549 case IPPROTO_TCP: 550 seq_printf(m, RPCBIND_NETID_TCP6); 551 break; 552 default: 553 if (showdefaults) 554 seq_printf(m, "auto"); 555 } 556 break; 557 default: 558 if (showdefaults) 559 seq_printf(m, "auto"); 560 } 561 } 562 563 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 564 int showdefaults) 565 { 566 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 567 568 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 569 return; 570 571 switch (sap->sa_family) { 572 case AF_INET: { 573 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 574 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 575 break; 576 } 577 case AF_INET6: { 578 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 579 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 580 break; 581 } 582 default: 583 if (showdefaults) 584 seq_printf(m, ",mountaddr=unspecified"); 585 } 586 587 if (nfss->mountd_version || showdefaults) 588 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 589 if ((nfss->mountd_port && 590 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 591 showdefaults) 592 seq_printf(m, ",mountport=%u", nfss->mountd_port); 593 594 nfs_show_mountd_netid(m, nfss, showdefaults); 595 } 596 597 #if IS_ENABLED(CONFIG_NFS_V4) 598 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 599 int showdefaults) 600 { 601 struct nfs_client *clp = nfss->nfs_client; 602 603 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 604 } 605 #else 606 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 607 int showdefaults) 608 { 609 } 610 #endif 611 612 static void nfs_show_nfs_version(struct seq_file *m, 613 unsigned int version, 614 unsigned int minorversion) 615 { 616 seq_printf(m, ",vers=%u", version); 617 if (version == 4) 618 seq_printf(m, ".%u", minorversion); 619 } 620 621 /* 622 * Describe the mount options in force on this server representation 623 */ 624 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 625 int showdefaults) 626 { 627 static const struct proc_nfs_info { 628 int flag; 629 const char *str; 630 const char *nostr; 631 } nfs_info[] = { 632 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 633 { NFS_MOUNT_POSIX, ",posix", "" }, 634 { NFS_MOUNT_NOCTO, ",nocto", "" }, 635 { NFS_MOUNT_NOAC, ",noac", "" }, 636 { NFS_MOUNT_NONLM, ",nolock", "" }, 637 { NFS_MOUNT_NOACL, ",noacl", "" }, 638 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 639 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 640 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 641 { 0, NULL, NULL } 642 }; 643 const struct proc_nfs_info *nfs_infop; 644 struct nfs_client *clp = nfss->nfs_client; 645 u32 version = clp->rpc_ops->version; 646 int local_flock, local_fcntl; 647 648 nfs_show_nfs_version(m, version, clp->cl_minorversion); 649 seq_printf(m, ",rsize=%u", nfss->rsize); 650 seq_printf(m, ",wsize=%u", nfss->wsize); 651 if (nfss->bsize != 0) 652 seq_printf(m, ",bsize=%u", nfss->bsize); 653 seq_printf(m, ",namlen=%u", nfss->namelen); 654 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 655 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 656 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 657 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 658 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 659 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 660 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 661 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 662 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 663 if (nfss->flags & nfs_infop->flag) 664 seq_puts(m, nfs_infop->str); 665 else 666 seq_puts(m, nfs_infop->nostr); 667 } 668 rcu_read_lock(); 669 seq_printf(m, ",proto=%s", 670 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 671 rcu_read_unlock(); 672 if (version == 4) { 673 if (nfss->port != NFS_PORT) 674 seq_printf(m, ",port=%u", nfss->port); 675 } else 676 if (nfss->port) 677 seq_printf(m, ",port=%u", nfss->port); 678 679 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 680 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 681 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 682 683 if (version != 4) 684 nfs_show_mountd_options(m, nfss, showdefaults); 685 else 686 nfs_show_nfsv4_options(m, nfss, showdefaults); 687 688 if (nfss->options & NFS_OPTION_FSCACHE) 689 seq_printf(m, ",fsc"); 690 691 if (nfss->options & NFS_OPTION_MIGRATION) 692 seq_printf(m, ",migration"); 693 694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 695 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 696 seq_printf(m, ",lookupcache=none"); 697 else 698 seq_printf(m, ",lookupcache=pos"); 699 } 700 701 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 702 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 703 704 if (!local_flock && !local_fcntl) 705 seq_printf(m, ",local_lock=none"); 706 else if (local_flock && local_fcntl) 707 seq_printf(m, ",local_lock=all"); 708 else if (local_flock) 709 seq_printf(m, ",local_lock=flock"); 710 else 711 seq_printf(m, ",local_lock=posix"); 712 } 713 714 /* 715 * Describe the mount options on this VFS mountpoint 716 */ 717 int nfs_show_options(struct seq_file *m, struct dentry *root) 718 { 719 struct nfs_server *nfss = NFS_SB(root->d_sb); 720 721 nfs_show_mount_options(m, nfss, 0); 722 723 rcu_read_lock(); 724 seq_printf(m, ",addr=%s", 725 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 726 RPC_DISPLAY_ADDR)); 727 rcu_read_unlock(); 728 729 return 0; 730 } 731 EXPORT_SYMBOL_GPL(nfs_show_options); 732 733 #if IS_ENABLED(CONFIG_NFS_V4) 734 #ifdef CONFIG_NFS_V4_1 735 static void show_sessions(struct seq_file *m, struct nfs_server *server) 736 { 737 if (nfs4_has_session(server->nfs_client)) 738 seq_printf(m, ",sessions"); 739 } 740 #else 741 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 742 #endif 743 #endif 744 745 #ifdef CONFIG_NFS_V4_1 746 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 747 { 748 seq_printf(m, ",pnfs="); 749 if (server->pnfs_curr_ld) 750 seq_printf(m, "%s", server->pnfs_curr_ld->name); 751 else 752 seq_printf(m, "not configured"); 753 } 754 755 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 756 { 757 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 758 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 759 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 760 "date='%llu,%u'", 761 impl_id->name, impl_id->domain, 762 impl_id->date.seconds, impl_id->date.nseconds); 763 } 764 } 765 #else 766 #if IS_ENABLED(CONFIG_NFS_V4) 767 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 768 { 769 } 770 #endif 771 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 772 { 773 } 774 #endif 775 776 int nfs_show_devname(struct seq_file *m, struct dentry *root) 777 { 778 char *page = (char *) __get_free_page(GFP_KERNEL); 779 char *devname, *dummy; 780 int err = 0; 781 if (!page) 782 return -ENOMEM; 783 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 784 if (IS_ERR(devname)) 785 err = PTR_ERR(devname); 786 else 787 seq_escape(m, devname, " \t\n\\"); 788 free_page((unsigned long)page); 789 return err; 790 } 791 EXPORT_SYMBOL_GPL(nfs_show_devname); 792 793 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 794 { 795 seq_puts(m, "/"); 796 return 0; 797 } 798 EXPORT_SYMBOL_GPL(nfs_show_path); 799 800 /* 801 * Present statistical information for this VFS mountpoint 802 */ 803 int nfs_show_stats(struct seq_file *m, struct dentry *root) 804 { 805 int i, cpu; 806 struct nfs_server *nfss = NFS_SB(root->d_sb); 807 struct rpc_auth *auth = nfss->client->cl_auth; 808 struct nfs_iostats totals = { }; 809 810 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 811 812 /* 813 * Display all mount option settings 814 */ 815 seq_printf(m, "\n\topts:\t"); 816 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 817 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 818 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 819 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 820 nfs_show_mount_options(m, nfss, 1); 821 822 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 823 824 show_implementation_id(m, nfss); 825 826 seq_printf(m, "\n\tcaps:\t"); 827 seq_printf(m, "caps=0x%x", nfss->caps); 828 seq_printf(m, ",wtmult=%u", nfss->wtmult); 829 seq_printf(m, ",dtsize=%u", nfss->dtsize); 830 seq_printf(m, ",bsize=%u", nfss->bsize); 831 seq_printf(m, ",namlen=%u", nfss->namelen); 832 833 #if IS_ENABLED(CONFIG_NFS_V4) 834 if (nfss->nfs_client->rpc_ops->version == 4) { 835 seq_printf(m, "\n\tnfsv4:\t"); 836 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 837 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 838 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 839 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 840 show_sessions(m, nfss); 841 show_pnfs(m, nfss); 842 } 843 #endif 844 845 /* 846 * Display security flavor in effect for this mount 847 */ 848 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 849 if (auth->au_flavor) 850 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 851 852 /* 853 * Display superblock I/O counters 854 */ 855 for_each_possible_cpu(cpu) { 856 struct nfs_iostats *stats; 857 858 preempt_disable(); 859 stats = per_cpu_ptr(nfss->io_stats, cpu); 860 861 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 862 totals.events[i] += stats->events[i]; 863 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 864 totals.bytes[i] += stats->bytes[i]; 865 #ifdef CONFIG_NFS_FSCACHE 866 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 867 totals.fscache[i] += stats->fscache[i]; 868 #endif 869 870 preempt_enable(); 871 } 872 873 seq_printf(m, "\n\tevents:\t"); 874 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 875 seq_printf(m, "%lu ", totals.events[i]); 876 seq_printf(m, "\n\tbytes:\t"); 877 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 878 seq_printf(m, "%Lu ", totals.bytes[i]); 879 #ifdef CONFIG_NFS_FSCACHE 880 if (nfss->options & NFS_OPTION_FSCACHE) { 881 seq_printf(m, "\n\tfsc:\t"); 882 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 883 seq_printf(m, "%Lu ", totals.bytes[i]); 884 } 885 #endif 886 seq_printf(m, "\n"); 887 888 rpc_print_iostats(m, nfss->client); 889 890 return 0; 891 } 892 EXPORT_SYMBOL_GPL(nfs_show_stats); 893 894 /* 895 * Begin unmount by attempting to remove all automounted mountpoints we added 896 * in response to xdev traversals and referrals 897 */ 898 void nfs_umount_begin(struct super_block *sb) 899 { 900 struct nfs_server *server; 901 struct rpc_clnt *rpc; 902 903 server = NFS_SB(sb); 904 /* -EIO all pending I/O */ 905 rpc = server->client_acl; 906 if (!IS_ERR(rpc)) 907 rpc_killall_tasks(rpc); 908 rpc = server->client; 909 if (!IS_ERR(rpc)) 910 rpc_killall_tasks(rpc); 911 } 912 EXPORT_SYMBOL_GPL(nfs_umount_begin); 913 914 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 915 { 916 struct nfs_parsed_mount_data *data; 917 918 data = kzalloc(sizeof(*data), GFP_KERNEL); 919 if (data) { 920 data->acregmin = NFS_DEF_ACREGMIN; 921 data->acregmax = NFS_DEF_ACREGMAX; 922 data->acdirmin = NFS_DEF_ACDIRMIN; 923 data->acdirmax = NFS_DEF_ACDIRMAX; 924 data->mount_server.port = NFS_UNSPEC_PORT; 925 data->nfs_server.port = NFS_UNSPEC_PORT; 926 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 927 data->selected_flavor = RPC_AUTH_MAXFLAVOR; 928 data->minorversion = 0; 929 data->need_mount = true; 930 data->net = current->nsproxy->net_ns; 931 security_init_mnt_opts(&data->lsm_opts); 932 } 933 return data; 934 } 935 936 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 937 { 938 if (data) { 939 kfree(data->client_address); 940 kfree(data->mount_server.hostname); 941 kfree(data->nfs_server.export_path); 942 kfree(data->nfs_server.hostname); 943 kfree(data->fscache_uniq); 944 security_free_mnt_opts(&data->lsm_opts); 945 kfree(data); 946 } 947 } 948 949 /* 950 * Sanity-check a server address provided by the mount command. 951 * 952 * Address family must be initialized, and address must not be 953 * the ANY address for that family. 954 */ 955 static int nfs_verify_server_address(struct sockaddr *addr) 956 { 957 switch (addr->sa_family) { 958 case AF_INET: { 959 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 960 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 961 } 962 case AF_INET6: { 963 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 964 return !ipv6_addr_any(sa); 965 } 966 } 967 968 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 969 return 0; 970 } 971 972 /* 973 * Select between a default port value and a user-specified port value. 974 * If a zero value is set, then autobind will be used. 975 */ 976 static void nfs_set_port(struct sockaddr *sap, int *port, 977 const unsigned short default_port) 978 { 979 if (*port == NFS_UNSPEC_PORT) 980 *port = default_port; 981 982 rpc_set_port(sap, *port); 983 } 984 985 /* 986 * Sanity check the NFS transport protocol. 987 * 988 */ 989 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 990 { 991 switch (mnt->nfs_server.protocol) { 992 case XPRT_TRANSPORT_UDP: 993 case XPRT_TRANSPORT_TCP: 994 case XPRT_TRANSPORT_RDMA: 995 break; 996 default: 997 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 998 } 999 } 1000 1001 /* 1002 * For text based NFSv2/v3 mounts, the mount protocol transport default 1003 * settings should depend upon the specified NFS transport. 1004 */ 1005 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1006 { 1007 nfs_validate_transport_protocol(mnt); 1008 1009 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1010 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1011 return; 1012 switch (mnt->nfs_server.protocol) { 1013 case XPRT_TRANSPORT_UDP: 1014 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1015 break; 1016 case XPRT_TRANSPORT_TCP: 1017 case XPRT_TRANSPORT_RDMA: 1018 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1019 } 1020 } 1021 1022 /* 1023 * Add 'flavor' to 'auth_info' if not already present. 1024 * Returns true if 'flavor' ends up in the list, false otherwise 1025 */ 1026 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, 1027 rpc_authflavor_t flavor) 1028 { 1029 unsigned int i; 1030 unsigned int max_flavor_len = (sizeof(auth_info->flavors) / 1031 sizeof(auth_info->flavors[0])); 1032 1033 /* make sure this flavor isn't already in the list */ 1034 for (i = 0; i < auth_info->flavor_len; i++) { 1035 if (flavor == auth_info->flavors[i]) 1036 return true; 1037 } 1038 1039 if (auth_info->flavor_len + 1 >= max_flavor_len) { 1040 dfprintk(MOUNT, "NFS: too many sec= flavors\n"); 1041 return false; 1042 } 1043 1044 auth_info->flavors[auth_info->flavor_len++] = flavor; 1045 return true; 1046 } 1047 1048 /* 1049 * Return true if 'match' is in auth_info or auth_info is empty. 1050 * Return false otherwise. 1051 */ 1052 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 1053 rpc_authflavor_t match) 1054 { 1055 int i; 1056 1057 if (!auth_info->flavor_len) 1058 return true; 1059 1060 for (i = 0; i < auth_info->flavor_len; i++) { 1061 if (auth_info->flavors[i] == match) 1062 return true; 1063 } 1064 return false; 1065 } 1066 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 1067 1068 /* 1069 * Parse the value of the 'sec=' option. 1070 */ 1071 static int nfs_parse_security_flavors(char *value, 1072 struct nfs_parsed_mount_data *mnt) 1073 { 1074 substring_t args[MAX_OPT_ARGS]; 1075 rpc_authflavor_t pseudoflavor; 1076 char *p; 1077 1078 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1079 1080 while ((p = strsep(&value, ":")) != NULL) { 1081 switch (match_token(p, nfs_secflavor_tokens, args)) { 1082 case Opt_sec_none: 1083 pseudoflavor = RPC_AUTH_NULL; 1084 break; 1085 case Opt_sec_sys: 1086 pseudoflavor = RPC_AUTH_UNIX; 1087 break; 1088 case Opt_sec_krb5: 1089 pseudoflavor = RPC_AUTH_GSS_KRB5; 1090 break; 1091 case Opt_sec_krb5i: 1092 pseudoflavor = RPC_AUTH_GSS_KRB5I; 1093 break; 1094 case Opt_sec_krb5p: 1095 pseudoflavor = RPC_AUTH_GSS_KRB5P; 1096 break; 1097 case Opt_sec_lkey: 1098 pseudoflavor = RPC_AUTH_GSS_LKEY; 1099 break; 1100 case Opt_sec_lkeyi: 1101 pseudoflavor = RPC_AUTH_GSS_LKEYI; 1102 break; 1103 case Opt_sec_lkeyp: 1104 pseudoflavor = RPC_AUTH_GSS_LKEYP; 1105 break; 1106 case Opt_sec_spkm: 1107 pseudoflavor = RPC_AUTH_GSS_SPKM; 1108 break; 1109 case Opt_sec_spkmi: 1110 pseudoflavor = RPC_AUTH_GSS_SPKMI; 1111 break; 1112 case Opt_sec_spkmp: 1113 pseudoflavor = RPC_AUTH_GSS_SPKMP; 1114 break; 1115 default: 1116 dfprintk(MOUNT, 1117 "NFS: sec= option '%s' not recognized\n", p); 1118 return 0; 1119 } 1120 1121 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor)) 1122 return 0; 1123 } 1124 1125 return 1; 1126 } 1127 1128 static int nfs_parse_version_string(char *string, 1129 struct nfs_parsed_mount_data *mnt, 1130 substring_t *args) 1131 { 1132 mnt->flags &= ~NFS_MOUNT_VER3; 1133 switch (match_token(string, nfs_vers_tokens, args)) { 1134 case Opt_vers_2: 1135 mnt->version = 2; 1136 break; 1137 case Opt_vers_3: 1138 mnt->flags |= NFS_MOUNT_VER3; 1139 mnt->version = 3; 1140 break; 1141 case Opt_vers_4: 1142 /* Backward compatibility option. In future, 1143 * the mount program should always supply 1144 * a NFSv4 minor version number. 1145 */ 1146 mnt->version = 4; 1147 break; 1148 case Opt_vers_4_0: 1149 mnt->version = 4; 1150 mnt->minorversion = 0; 1151 break; 1152 case Opt_vers_4_1: 1153 mnt->version = 4; 1154 mnt->minorversion = 1; 1155 break; 1156 case Opt_vers_4_2: 1157 mnt->version = 4; 1158 mnt->minorversion = 2; 1159 break; 1160 default: 1161 return 0; 1162 } 1163 return 1; 1164 } 1165 1166 static int nfs_get_option_str(substring_t args[], char **option) 1167 { 1168 kfree(*option); 1169 *option = match_strdup(args); 1170 return !*option; 1171 } 1172 1173 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1174 { 1175 int rc; 1176 char *string; 1177 1178 string = match_strdup(args); 1179 if (string == NULL) 1180 return -ENOMEM; 1181 rc = kstrtoul(string, 10, option); 1182 kfree(string); 1183 1184 return rc; 1185 } 1186 1187 /* 1188 * Error-check and convert a string of mount options from user space into 1189 * a data structure. The whole mount string is processed; bad options are 1190 * skipped as they are encountered. If there were no errors, return 1; 1191 * otherwise return 0 (zero). 1192 */ 1193 static int nfs_parse_mount_options(char *raw, 1194 struct nfs_parsed_mount_data *mnt) 1195 { 1196 char *p, *string, *secdata; 1197 int rc, sloppy = 0, invalid_option = 0; 1198 unsigned short protofamily = AF_UNSPEC; 1199 unsigned short mountfamily = AF_UNSPEC; 1200 1201 if (!raw) { 1202 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1203 return 1; 1204 } 1205 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1206 1207 secdata = alloc_secdata(); 1208 if (!secdata) 1209 goto out_nomem; 1210 1211 rc = security_sb_copy_data(raw, secdata); 1212 if (rc) 1213 goto out_security_failure; 1214 1215 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1216 if (rc) 1217 goto out_security_failure; 1218 1219 free_secdata(secdata); 1220 1221 while ((p = strsep(&raw, ",")) != NULL) { 1222 substring_t args[MAX_OPT_ARGS]; 1223 unsigned long option; 1224 int token; 1225 1226 if (!*p) 1227 continue; 1228 1229 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1230 1231 token = match_token(p, nfs_mount_option_tokens, args); 1232 switch (token) { 1233 1234 /* 1235 * boolean options: foo/nofoo 1236 */ 1237 case Opt_soft: 1238 mnt->flags |= NFS_MOUNT_SOFT; 1239 break; 1240 case Opt_hard: 1241 mnt->flags &= ~NFS_MOUNT_SOFT; 1242 break; 1243 case Opt_posix: 1244 mnt->flags |= NFS_MOUNT_POSIX; 1245 break; 1246 case Opt_noposix: 1247 mnt->flags &= ~NFS_MOUNT_POSIX; 1248 break; 1249 case Opt_cto: 1250 mnt->flags &= ~NFS_MOUNT_NOCTO; 1251 break; 1252 case Opt_nocto: 1253 mnt->flags |= NFS_MOUNT_NOCTO; 1254 break; 1255 case Opt_ac: 1256 mnt->flags &= ~NFS_MOUNT_NOAC; 1257 break; 1258 case Opt_noac: 1259 mnt->flags |= NFS_MOUNT_NOAC; 1260 break; 1261 case Opt_lock: 1262 mnt->flags &= ~NFS_MOUNT_NONLM; 1263 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1264 NFS_MOUNT_LOCAL_FCNTL); 1265 break; 1266 case Opt_nolock: 1267 mnt->flags |= NFS_MOUNT_NONLM; 1268 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1269 NFS_MOUNT_LOCAL_FCNTL); 1270 break; 1271 case Opt_udp: 1272 mnt->flags &= ~NFS_MOUNT_TCP; 1273 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1274 break; 1275 case Opt_tcp: 1276 mnt->flags |= NFS_MOUNT_TCP; 1277 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1278 break; 1279 case Opt_rdma: 1280 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1281 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1282 xprt_load_transport(p); 1283 break; 1284 case Opt_acl: 1285 mnt->flags &= ~NFS_MOUNT_NOACL; 1286 break; 1287 case Opt_noacl: 1288 mnt->flags |= NFS_MOUNT_NOACL; 1289 break; 1290 case Opt_rdirplus: 1291 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1292 break; 1293 case Opt_nordirplus: 1294 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1295 break; 1296 case Opt_sharecache: 1297 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1298 break; 1299 case Opt_nosharecache: 1300 mnt->flags |= NFS_MOUNT_UNSHARED; 1301 break; 1302 case Opt_resvport: 1303 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1304 break; 1305 case Opt_noresvport: 1306 mnt->flags |= NFS_MOUNT_NORESVPORT; 1307 break; 1308 case Opt_fscache: 1309 mnt->options |= NFS_OPTION_FSCACHE; 1310 kfree(mnt->fscache_uniq); 1311 mnt->fscache_uniq = NULL; 1312 break; 1313 case Opt_nofscache: 1314 mnt->options &= ~NFS_OPTION_FSCACHE; 1315 kfree(mnt->fscache_uniq); 1316 mnt->fscache_uniq = NULL; 1317 break; 1318 case Opt_migration: 1319 mnt->options |= NFS_OPTION_MIGRATION; 1320 break; 1321 case Opt_nomigration: 1322 mnt->options &= NFS_OPTION_MIGRATION; 1323 break; 1324 1325 /* 1326 * options that take numeric values 1327 */ 1328 case Opt_port: 1329 if (nfs_get_option_ul(args, &option) || 1330 option > USHRT_MAX) 1331 goto out_invalid_value; 1332 mnt->nfs_server.port = option; 1333 break; 1334 case Opt_rsize: 1335 if (nfs_get_option_ul(args, &option)) 1336 goto out_invalid_value; 1337 mnt->rsize = option; 1338 break; 1339 case Opt_wsize: 1340 if (nfs_get_option_ul(args, &option)) 1341 goto out_invalid_value; 1342 mnt->wsize = option; 1343 break; 1344 case Opt_bsize: 1345 if (nfs_get_option_ul(args, &option)) 1346 goto out_invalid_value; 1347 mnt->bsize = option; 1348 break; 1349 case Opt_timeo: 1350 if (nfs_get_option_ul(args, &option) || option == 0) 1351 goto out_invalid_value; 1352 mnt->timeo = option; 1353 break; 1354 case Opt_retrans: 1355 if (nfs_get_option_ul(args, &option) || option == 0) 1356 goto out_invalid_value; 1357 mnt->retrans = option; 1358 break; 1359 case Opt_acregmin: 1360 if (nfs_get_option_ul(args, &option)) 1361 goto out_invalid_value; 1362 mnt->acregmin = option; 1363 break; 1364 case Opt_acregmax: 1365 if (nfs_get_option_ul(args, &option)) 1366 goto out_invalid_value; 1367 mnt->acregmax = option; 1368 break; 1369 case Opt_acdirmin: 1370 if (nfs_get_option_ul(args, &option)) 1371 goto out_invalid_value; 1372 mnt->acdirmin = option; 1373 break; 1374 case Opt_acdirmax: 1375 if (nfs_get_option_ul(args, &option)) 1376 goto out_invalid_value; 1377 mnt->acdirmax = option; 1378 break; 1379 case Opt_actimeo: 1380 if (nfs_get_option_ul(args, &option)) 1381 goto out_invalid_value; 1382 mnt->acregmin = mnt->acregmax = 1383 mnt->acdirmin = mnt->acdirmax = option; 1384 break; 1385 case Opt_namelen: 1386 if (nfs_get_option_ul(args, &option)) 1387 goto out_invalid_value; 1388 mnt->namlen = option; 1389 break; 1390 case Opt_mountport: 1391 if (nfs_get_option_ul(args, &option) || 1392 option > USHRT_MAX) 1393 goto out_invalid_value; 1394 mnt->mount_server.port = option; 1395 break; 1396 case Opt_mountvers: 1397 if (nfs_get_option_ul(args, &option) || 1398 option < NFS_MNT_VERSION || 1399 option > NFS_MNT3_VERSION) 1400 goto out_invalid_value; 1401 mnt->mount_server.version = option; 1402 break; 1403 case Opt_minorversion: 1404 if (nfs_get_option_ul(args, &option)) 1405 goto out_invalid_value; 1406 if (option > NFS4_MAX_MINOR_VERSION) 1407 goto out_invalid_value; 1408 mnt->minorversion = option; 1409 break; 1410 1411 /* 1412 * options that take text values 1413 */ 1414 case Opt_nfsvers: 1415 string = match_strdup(args); 1416 if (string == NULL) 1417 goto out_nomem; 1418 rc = nfs_parse_version_string(string, mnt, args); 1419 kfree(string); 1420 if (!rc) 1421 goto out_invalid_value; 1422 break; 1423 case Opt_sec: 1424 string = match_strdup(args); 1425 if (string == NULL) 1426 goto out_nomem; 1427 rc = nfs_parse_security_flavors(string, mnt); 1428 kfree(string); 1429 if (!rc) { 1430 dfprintk(MOUNT, "NFS: unrecognized " 1431 "security flavor\n"); 1432 return 0; 1433 } 1434 break; 1435 case Opt_proto: 1436 string = match_strdup(args); 1437 if (string == NULL) 1438 goto out_nomem; 1439 token = match_token(string, 1440 nfs_xprt_protocol_tokens, args); 1441 1442 protofamily = AF_INET; 1443 switch (token) { 1444 case Opt_xprt_udp6: 1445 protofamily = AF_INET6; 1446 case Opt_xprt_udp: 1447 mnt->flags &= ~NFS_MOUNT_TCP; 1448 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1449 break; 1450 case Opt_xprt_tcp6: 1451 protofamily = AF_INET6; 1452 case Opt_xprt_tcp: 1453 mnt->flags |= NFS_MOUNT_TCP; 1454 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1455 break; 1456 case Opt_xprt_rdma: 1457 /* vector side protocols to TCP */ 1458 mnt->flags |= NFS_MOUNT_TCP; 1459 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1460 xprt_load_transport(string); 1461 break; 1462 default: 1463 dfprintk(MOUNT, "NFS: unrecognized " 1464 "transport protocol\n"); 1465 kfree(string); 1466 return 0; 1467 } 1468 kfree(string); 1469 break; 1470 case Opt_mountproto: 1471 string = match_strdup(args); 1472 if (string == NULL) 1473 goto out_nomem; 1474 token = match_token(string, 1475 nfs_xprt_protocol_tokens, args); 1476 kfree(string); 1477 1478 mountfamily = AF_INET; 1479 switch (token) { 1480 case Opt_xprt_udp6: 1481 mountfamily = AF_INET6; 1482 case Opt_xprt_udp: 1483 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1484 break; 1485 case Opt_xprt_tcp6: 1486 mountfamily = AF_INET6; 1487 case Opt_xprt_tcp: 1488 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1489 break; 1490 case Opt_xprt_rdma: /* not used for side protocols */ 1491 default: 1492 dfprintk(MOUNT, "NFS: unrecognized " 1493 "transport protocol\n"); 1494 return 0; 1495 } 1496 break; 1497 case Opt_addr: 1498 string = match_strdup(args); 1499 if (string == NULL) 1500 goto out_nomem; 1501 mnt->nfs_server.addrlen = 1502 rpc_pton(mnt->net, string, strlen(string), 1503 (struct sockaddr *) 1504 &mnt->nfs_server.address, 1505 sizeof(mnt->nfs_server.address)); 1506 kfree(string); 1507 if (mnt->nfs_server.addrlen == 0) 1508 goto out_invalid_address; 1509 break; 1510 case Opt_clientaddr: 1511 if (nfs_get_option_str(args, &mnt->client_address)) 1512 goto out_nomem; 1513 break; 1514 case Opt_mounthost: 1515 if (nfs_get_option_str(args, 1516 &mnt->mount_server.hostname)) 1517 goto out_nomem; 1518 break; 1519 case Opt_mountaddr: 1520 string = match_strdup(args); 1521 if (string == NULL) 1522 goto out_nomem; 1523 mnt->mount_server.addrlen = 1524 rpc_pton(mnt->net, string, strlen(string), 1525 (struct sockaddr *) 1526 &mnt->mount_server.address, 1527 sizeof(mnt->mount_server.address)); 1528 kfree(string); 1529 if (mnt->mount_server.addrlen == 0) 1530 goto out_invalid_address; 1531 break; 1532 case Opt_lookupcache: 1533 string = match_strdup(args); 1534 if (string == NULL) 1535 goto out_nomem; 1536 token = match_token(string, 1537 nfs_lookupcache_tokens, args); 1538 kfree(string); 1539 switch (token) { 1540 case Opt_lookupcache_all: 1541 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1542 break; 1543 case Opt_lookupcache_positive: 1544 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1545 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1546 break; 1547 case Opt_lookupcache_none: 1548 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1549 break; 1550 default: 1551 dfprintk(MOUNT, "NFS: invalid " 1552 "lookupcache argument\n"); 1553 return 0; 1554 }; 1555 break; 1556 case Opt_fscache_uniq: 1557 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1558 goto out_nomem; 1559 mnt->options |= NFS_OPTION_FSCACHE; 1560 break; 1561 case Opt_local_lock: 1562 string = match_strdup(args); 1563 if (string == NULL) 1564 goto out_nomem; 1565 token = match_token(string, nfs_local_lock_tokens, 1566 args); 1567 kfree(string); 1568 switch (token) { 1569 case Opt_local_lock_all: 1570 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1571 NFS_MOUNT_LOCAL_FCNTL); 1572 break; 1573 case Opt_local_lock_flock: 1574 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1575 break; 1576 case Opt_local_lock_posix: 1577 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1578 break; 1579 case Opt_local_lock_none: 1580 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1581 NFS_MOUNT_LOCAL_FCNTL); 1582 break; 1583 default: 1584 dfprintk(MOUNT, "NFS: invalid " 1585 "local_lock argument\n"); 1586 return 0; 1587 }; 1588 break; 1589 1590 /* 1591 * Special options 1592 */ 1593 case Opt_sloppy: 1594 sloppy = 1; 1595 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1596 break; 1597 case Opt_userspace: 1598 case Opt_deprecated: 1599 dfprintk(MOUNT, "NFS: ignoring mount option " 1600 "'%s'\n", p); 1601 break; 1602 1603 default: 1604 invalid_option = 1; 1605 dfprintk(MOUNT, "NFS: unrecognized mount option " 1606 "'%s'\n", p); 1607 } 1608 } 1609 1610 if (!sloppy && invalid_option) 1611 return 0; 1612 1613 if (mnt->minorversion && mnt->version != 4) 1614 goto out_minorversion_mismatch; 1615 1616 if (mnt->options & NFS_OPTION_MIGRATION && 1617 (mnt->version != 4 || mnt->minorversion != 0)) 1618 goto out_migration_misuse; 1619 1620 /* 1621 * verify that any proto=/mountproto= options match the address 1622 * families in the addr=/mountaddr= options. 1623 */ 1624 if (protofamily != AF_UNSPEC && 1625 protofamily != mnt->nfs_server.address.ss_family) 1626 goto out_proto_mismatch; 1627 1628 if (mountfamily != AF_UNSPEC) { 1629 if (mnt->mount_server.addrlen) { 1630 if (mountfamily != mnt->mount_server.address.ss_family) 1631 goto out_mountproto_mismatch; 1632 } else { 1633 if (mountfamily != mnt->nfs_server.address.ss_family) 1634 goto out_mountproto_mismatch; 1635 } 1636 } 1637 1638 return 1; 1639 1640 out_mountproto_mismatch: 1641 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1642 "option\n"); 1643 return 0; 1644 out_proto_mismatch: 1645 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1646 return 0; 1647 out_invalid_address: 1648 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1649 return 0; 1650 out_invalid_value: 1651 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1652 return 0; 1653 out_minorversion_mismatch: 1654 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1655 "minorversion=%u\n", mnt->version, mnt->minorversion); 1656 return 0; 1657 out_migration_misuse: 1658 printk(KERN_INFO 1659 "NFS: 'migration' not supported for this NFS version\n"); 1660 return 0; 1661 out_nomem: 1662 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1663 return 0; 1664 out_security_failure: 1665 free_secdata(secdata); 1666 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1667 return 0; 1668 } 1669 1670 /* 1671 * Ensure that a specified authtype in args->auth_info is supported by 1672 * the server. Returns 0 and sets args->selected_flavor if it's ok, and 1673 * -EACCES if not. 1674 */ 1675 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args, 1676 rpc_authflavor_t *server_authlist, unsigned int count) 1677 { 1678 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 1679 unsigned int i; 1680 1681 /* 1682 * If the sec= mount option is used, the specified flavor or AUTH_NULL 1683 * must be in the list returned by the server. 1684 * 1685 * AUTH_NULL has a special meaning when it's in the server list - it 1686 * means that the server will ignore the rpc creds, so any flavor 1687 * can be used. 1688 */ 1689 for (i = 0; i < count; i++) { 1690 flavor = server_authlist[i]; 1691 1692 if (nfs_auth_info_match(&args->auth_info, flavor) || 1693 flavor == RPC_AUTH_NULL) 1694 goto out; 1695 } 1696 1697 dfprintk(MOUNT, 1698 "NFS: specified auth flavors not supported by server\n"); 1699 return -EACCES; 1700 1701 out: 1702 args->selected_flavor = flavor; 1703 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor); 1704 return 0; 1705 } 1706 1707 /* 1708 * Use the remote server's MOUNT service to request the NFS file handle 1709 * corresponding to the provided path. 1710 */ 1711 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1712 struct nfs_fh *root_fh, 1713 rpc_authflavor_t *server_authlist, 1714 unsigned int *server_authlist_len) 1715 { 1716 struct nfs_mount_request request = { 1717 .sap = (struct sockaddr *) 1718 &args->mount_server.address, 1719 .dirpath = args->nfs_server.export_path, 1720 .protocol = args->mount_server.protocol, 1721 .fh = root_fh, 1722 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1723 .auth_flav_len = server_authlist_len, 1724 .auth_flavs = server_authlist, 1725 .net = args->net, 1726 }; 1727 int status; 1728 1729 if (args->mount_server.version == 0) { 1730 switch (args->version) { 1731 default: 1732 args->mount_server.version = NFS_MNT3_VERSION; 1733 break; 1734 case 2: 1735 args->mount_server.version = NFS_MNT_VERSION; 1736 } 1737 } 1738 request.version = args->mount_server.version; 1739 1740 if (args->mount_server.hostname) 1741 request.hostname = args->mount_server.hostname; 1742 else 1743 request.hostname = args->nfs_server.hostname; 1744 1745 /* 1746 * Construct the mount server's address. 1747 */ 1748 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1749 memcpy(request.sap, &args->nfs_server.address, 1750 args->nfs_server.addrlen); 1751 args->mount_server.addrlen = args->nfs_server.addrlen; 1752 } 1753 request.salen = args->mount_server.addrlen; 1754 nfs_set_port(request.sap, &args->mount_server.port, 0); 1755 1756 /* 1757 * Now ask the mount server to map our export path 1758 * to a file handle. 1759 */ 1760 status = nfs_mount(&request); 1761 if (status != 0) { 1762 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1763 request.hostname, status); 1764 return status; 1765 } 1766 1767 return 0; 1768 } 1769 1770 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, 1771 struct nfs_subversion *nfs_mod) 1772 { 1773 int status; 1774 unsigned int i; 1775 bool tried_auth_unix = false; 1776 bool auth_null_in_list = false; 1777 struct nfs_server *server = ERR_PTR(-EACCES); 1778 struct nfs_parsed_mount_data *args = mount_info->parsed; 1779 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 1780 unsigned int authlist_len = ARRAY_SIZE(authlist); 1781 1782 status = nfs_request_mount(args, mount_info->mntfh, authlist, 1783 &authlist_len); 1784 if (status) 1785 return ERR_PTR(status); 1786 1787 /* 1788 * Was a sec= authflavor specified in the options? First, verify 1789 * whether the server supports it, and then just try to use it if so. 1790 */ 1791 if (args->auth_info.flavor_len > 0) { 1792 status = nfs_verify_authflavors(args, authlist, authlist_len); 1793 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 1794 args->selected_flavor); 1795 if (status) 1796 return ERR_PTR(status); 1797 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1798 } 1799 1800 /* 1801 * No sec= option was provided. RFC 2623, section 2.7 suggests we 1802 * SHOULD prefer the flavor listed first. However, some servers list 1803 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 1804 */ 1805 for (i = 0; i < authlist_len; ++i) { 1806 rpc_authflavor_t flavor; 1807 struct rpcsec_gss_info info; 1808 1809 flavor = authlist[i]; 1810 switch (flavor) { 1811 case RPC_AUTH_UNIX: 1812 tried_auth_unix = true; 1813 break; 1814 case RPC_AUTH_NULL: 1815 auth_null_in_list = true; 1816 continue; 1817 default: 1818 if (rpcauth_get_gssinfo(flavor, &info) != 0) 1819 continue; 1820 /* Fallthrough */ 1821 } 1822 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 1823 args->selected_flavor = flavor; 1824 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1825 if (!IS_ERR(server)) 1826 return server; 1827 } 1828 1829 /* 1830 * Nothing we tried so far worked. At this point, give up if we've 1831 * already tried AUTH_UNIX or if the server's list doesn't contain 1832 * AUTH_NULL 1833 */ 1834 if (tried_auth_unix || !auth_null_in_list) 1835 return server; 1836 1837 /* Last chance! Try AUTH_UNIX */ 1838 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 1839 args->selected_flavor = RPC_AUTH_UNIX; 1840 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1841 } 1842 1843 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1844 struct nfs_mount_info *mount_info, 1845 struct nfs_subversion *nfs_mod) 1846 { 1847 struct nfs_server *server; 1848 1849 if (mount_info->parsed->need_mount) 1850 server = nfs_try_mount_request(mount_info, nfs_mod); 1851 else 1852 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1853 1854 if (IS_ERR(server)) 1855 return ERR_CAST(server); 1856 1857 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1858 } 1859 EXPORT_SYMBOL_GPL(nfs_try_mount); 1860 1861 /* 1862 * Split "dev_name" into "hostname:export_path". 1863 * 1864 * The leftmost colon demarks the split between the server's hostname 1865 * and the export path. If the hostname starts with a left square 1866 * bracket, then it may contain colons. 1867 * 1868 * Note: caller frees hostname and export path, even on error. 1869 */ 1870 static int nfs_parse_devname(const char *dev_name, 1871 char **hostname, size_t maxnamlen, 1872 char **export_path, size_t maxpathlen) 1873 { 1874 size_t len; 1875 char *end; 1876 1877 /* Is the host name protected with square brakcets? */ 1878 if (*dev_name == '[') { 1879 end = strchr(++dev_name, ']'); 1880 if (end == NULL || end[1] != ':') 1881 goto out_bad_devname; 1882 1883 len = end - dev_name; 1884 end++; 1885 } else { 1886 char *comma; 1887 1888 end = strchr(dev_name, ':'); 1889 if (end == NULL) 1890 goto out_bad_devname; 1891 len = end - dev_name; 1892 1893 /* kill possible hostname list: not supported */ 1894 comma = strchr(dev_name, ','); 1895 if (comma != NULL && comma < end) 1896 *comma = 0; 1897 } 1898 1899 if (len > maxnamlen) 1900 goto out_hostname; 1901 1902 /* N.B. caller will free nfs_server.hostname in all cases */ 1903 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1904 if (*hostname == NULL) 1905 goto out_nomem; 1906 len = strlen(++end); 1907 if (len > maxpathlen) 1908 goto out_path; 1909 *export_path = kstrndup(end, len, GFP_KERNEL); 1910 if (!*export_path) 1911 goto out_nomem; 1912 1913 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1914 return 0; 1915 1916 out_bad_devname: 1917 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1918 return -EINVAL; 1919 1920 out_nomem: 1921 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1922 return -ENOMEM; 1923 1924 out_hostname: 1925 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1926 return -ENAMETOOLONG; 1927 1928 out_path: 1929 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1930 return -ENAMETOOLONG; 1931 } 1932 1933 /* 1934 * Validate the NFS2/NFS3 mount data 1935 * - fills in the mount root filehandle 1936 * 1937 * For option strings, user space handles the following behaviors: 1938 * 1939 * + DNS: mapping server host name to IP address ("addr=" option) 1940 * 1941 * + failure mode: how to behave if a mount request can't be handled 1942 * immediately ("fg/bg" option) 1943 * 1944 * + retry: how often to retry a mount request ("retry=" option) 1945 * 1946 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1947 * mountproto=tcp after mountproto=udp, and so on 1948 */ 1949 static int nfs23_validate_mount_data(void *options, 1950 struct nfs_parsed_mount_data *args, 1951 struct nfs_fh *mntfh, 1952 const char *dev_name) 1953 { 1954 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1955 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1956 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; 1957 1958 if (data == NULL) 1959 goto out_no_data; 1960 1961 args->version = NFS_DEFAULT_VERSION; 1962 switch (data->version) { 1963 case 1: 1964 data->namlen = 0; 1965 case 2: 1966 data->bsize = 0; 1967 case 3: 1968 if (data->flags & NFS_MOUNT_VER3) 1969 goto out_no_v3; 1970 data->root.size = NFS2_FHSIZE; 1971 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1972 /* Turn off security negotiation */ 1973 extra_flags |= NFS_MOUNT_SECFLAVOUR; 1974 case 4: 1975 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1976 goto out_no_sec; 1977 case 5: 1978 memset(data->context, 0, sizeof(data->context)); 1979 case 6: 1980 if (data->flags & NFS_MOUNT_VER3) { 1981 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1982 goto out_invalid_fh; 1983 mntfh->size = data->root.size; 1984 args->version = 3; 1985 } else { 1986 mntfh->size = NFS2_FHSIZE; 1987 args->version = 2; 1988 } 1989 1990 1991 memcpy(mntfh->data, data->root.data, mntfh->size); 1992 if (mntfh->size < sizeof(mntfh->data)) 1993 memset(mntfh->data + mntfh->size, 0, 1994 sizeof(mntfh->data) - mntfh->size); 1995 1996 /* 1997 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1998 * can deal with. 1999 */ 2000 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 2001 args->flags |= extra_flags; 2002 args->rsize = data->rsize; 2003 args->wsize = data->wsize; 2004 args->timeo = data->timeo; 2005 args->retrans = data->retrans; 2006 args->acregmin = data->acregmin; 2007 args->acregmax = data->acregmax; 2008 args->acdirmin = data->acdirmin; 2009 args->acdirmax = data->acdirmax; 2010 args->need_mount = false; 2011 2012 memcpy(sap, &data->addr, sizeof(data->addr)); 2013 args->nfs_server.addrlen = sizeof(data->addr); 2014 args->nfs_server.port = ntohs(data->addr.sin_port); 2015 if (!nfs_verify_server_address(sap)) 2016 goto out_no_address; 2017 2018 if (!(data->flags & NFS_MOUNT_TCP)) 2019 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 2020 /* N.B. caller will free nfs_server.hostname in all cases */ 2021 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 2022 args->namlen = data->namlen; 2023 args->bsize = data->bsize; 2024 2025 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2026 args->selected_flavor = data->pseudoflavor; 2027 else 2028 args->selected_flavor = RPC_AUTH_UNIX; 2029 if (!args->nfs_server.hostname) 2030 goto out_nomem; 2031 2032 if (!(data->flags & NFS_MOUNT_NONLM)) 2033 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 2034 NFS_MOUNT_LOCAL_FCNTL); 2035 else 2036 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 2037 NFS_MOUNT_LOCAL_FCNTL); 2038 /* 2039 * The legacy version 6 binary mount data from userspace has a 2040 * field used only to transport selinux information into the 2041 * the kernel. To continue to support that functionality we 2042 * have a touch of selinux knowledge here in the NFS code. The 2043 * userspace code converted context=blah to just blah so we are 2044 * converting back to the full string selinux understands. 2045 */ 2046 if (data->context[0]){ 2047 #ifdef CONFIG_SECURITY_SELINUX 2048 int rc; 2049 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 2050 if (!opts_str) 2051 return -ENOMEM; 2052 strcpy(opts_str, "context="); 2053 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 2054 strcat(opts_str, &data->context[0]); 2055 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 2056 kfree(opts_str); 2057 if (rc) 2058 return rc; 2059 #else 2060 return -EINVAL; 2061 #endif 2062 } 2063 2064 break; 2065 default: 2066 return NFS_TEXT_DATA; 2067 } 2068 2069 #if !IS_ENABLED(CONFIG_NFS_V3) 2070 if (args->version == 3) 2071 goto out_v3_not_compiled; 2072 #endif /* !CONFIG_NFS_V3 */ 2073 2074 return 0; 2075 2076 out_no_data: 2077 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2078 return -EINVAL; 2079 2080 out_no_v3: 2081 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2082 data->version); 2083 return -EINVAL; 2084 2085 out_no_sec: 2086 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2087 return -EINVAL; 2088 2089 #if !IS_ENABLED(CONFIG_NFS_V3) 2090 out_v3_not_compiled: 2091 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 2092 return -EPROTONOSUPPORT; 2093 #endif /* !CONFIG_NFS_V3 */ 2094 2095 out_nomem: 2096 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2097 return -ENOMEM; 2098 2099 out_no_address: 2100 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2101 return -EINVAL; 2102 2103 out_invalid_fh: 2104 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2105 return -EINVAL; 2106 } 2107 2108 #if IS_ENABLED(CONFIG_NFS_V4) 2109 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2110 void *options, 2111 struct nfs_parsed_mount_data *args, 2112 struct nfs_fh *mntfh, 2113 const char *dev_name) 2114 { 2115 if (fs_type == &nfs_fs_type) 2116 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2117 return nfs4_validate_mount_data(options, args, dev_name); 2118 } 2119 #else 2120 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2121 void *options, 2122 struct nfs_parsed_mount_data *args, 2123 struct nfs_fh *mntfh, 2124 const char *dev_name) 2125 { 2126 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2127 } 2128 #endif 2129 2130 static int nfs_validate_text_mount_data(void *options, 2131 struct nfs_parsed_mount_data *args, 2132 const char *dev_name) 2133 { 2134 int port = 0; 2135 int max_namelen = PAGE_SIZE; 2136 int max_pathlen = NFS_MAXPATHLEN; 2137 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2138 2139 if (nfs_parse_mount_options((char *)options, args) == 0) 2140 return -EINVAL; 2141 2142 if (!nfs_verify_server_address(sap)) 2143 goto out_no_address; 2144 2145 if (args->version == 4) { 2146 #if IS_ENABLED(CONFIG_NFS_V4) 2147 port = NFS_PORT; 2148 max_namelen = NFS4_MAXNAMLEN; 2149 max_pathlen = NFS4_MAXPATHLEN; 2150 nfs_validate_transport_protocol(args); 2151 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2152 goto out_invalid_transport_udp; 2153 nfs4_validate_mount_flags(args); 2154 #else 2155 goto out_v4_not_compiled; 2156 #endif /* CONFIG_NFS_V4 */ 2157 } else 2158 nfs_set_mount_transport_protocol(args); 2159 2160 nfs_set_port(sap, &args->nfs_server.port, port); 2161 2162 return nfs_parse_devname(dev_name, 2163 &args->nfs_server.hostname, 2164 max_namelen, 2165 &args->nfs_server.export_path, 2166 max_pathlen); 2167 2168 #if !IS_ENABLED(CONFIG_NFS_V4) 2169 out_v4_not_compiled: 2170 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2171 return -EPROTONOSUPPORT; 2172 #else 2173 out_invalid_transport_udp: 2174 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2175 return -EINVAL; 2176 #endif /* !CONFIG_NFS_V4 */ 2177 2178 out_no_address: 2179 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2180 return -EINVAL; 2181 } 2182 2183 #define NFS_MOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 2184 | NFS_MOUNT_SECURE \ 2185 | NFS_MOUNT_TCP \ 2186 | NFS_MOUNT_VER3 \ 2187 | NFS_MOUNT_KERBEROS \ 2188 | NFS_MOUNT_NONLM \ 2189 | NFS_MOUNT_BROKEN_SUID \ 2190 | NFS_MOUNT_STRICTLOCK \ 2191 | NFS_MOUNT_UNSHARED \ 2192 | NFS_MOUNT_NORESVPORT \ 2193 | NFS_MOUNT_LEGACY_INTERFACE) 2194 2195 static int 2196 nfs_compare_remount_data(struct nfs_server *nfss, 2197 struct nfs_parsed_mount_data *data) 2198 { 2199 if ((data->flags ^ nfss->flags) & NFS_MOUNT_CMP_FLAGMASK || 2200 data->rsize != nfss->rsize || 2201 data->wsize != nfss->wsize || 2202 data->version != nfss->nfs_client->rpc_ops->version || 2203 data->minorversion != nfss->nfs_client->cl_minorversion || 2204 data->retrans != nfss->client->cl_timeout->to_retries || 2205 data->selected_flavor != nfss->client->cl_auth->au_flavor || 2206 data->acregmin != nfss->acregmin / HZ || 2207 data->acregmax != nfss->acregmax / HZ || 2208 data->acdirmin != nfss->acdirmin / HZ || 2209 data->acdirmax != nfss->acdirmax / HZ || 2210 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2211 data->nfs_server.port != nfss->port || 2212 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2213 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2214 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2215 return -EINVAL; 2216 2217 return 0; 2218 } 2219 2220 int 2221 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2222 { 2223 int error; 2224 struct nfs_server *nfss = sb->s_fs_info; 2225 struct nfs_parsed_mount_data *data; 2226 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2227 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2228 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2229 2230 sync_filesystem(sb); 2231 2232 /* 2233 * Userspace mount programs that send binary options generally send 2234 * them populated with default values. We have no way to know which 2235 * ones were explicitly specified. Fall back to legacy behavior and 2236 * just return success. 2237 */ 2238 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2239 (nfsvers <= 3 && (!options || (options->version >= 1 && 2240 options->version <= 6)))) 2241 return 0; 2242 2243 data = kzalloc(sizeof(*data), GFP_KERNEL); 2244 if (data == NULL) 2245 return -ENOMEM; 2246 2247 /* fill out struct with values from existing mount */ 2248 data->flags = nfss->flags; 2249 data->rsize = nfss->rsize; 2250 data->wsize = nfss->wsize; 2251 data->retrans = nfss->client->cl_timeout->to_retries; 2252 data->selected_flavor = nfss->client->cl_auth->au_flavor; 2253 data->auth_info = nfss->auth_info; 2254 data->acregmin = nfss->acregmin / HZ; 2255 data->acregmax = nfss->acregmax / HZ; 2256 data->acdirmin = nfss->acdirmin / HZ; 2257 data->acdirmax = nfss->acdirmax / HZ; 2258 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2259 data->nfs_server.port = nfss->port; 2260 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2261 data->version = nfsvers; 2262 data->minorversion = nfss->nfs_client->cl_minorversion; 2263 data->net = current->nsproxy->net_ns; 2264 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2265 data->nfs_server.addrlen); 2266 2267 /* overwrite those values with any that were specified */ 2268 error = -EINVAL; 2269 if (!nfs_parse_mount_options((char *)options, data)) 2270 goto out; 2271 2272 /* 2273 * noac is a special case. It implies -o sync, but that's not 2274 * necessarily reflected in the mtab options. do_remount_sb 2275 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2276 * remount options, so we have to explicitly reset it. 2277 */ 2278 if (data->flags & NFS_MOUNT_NOAC) 2279 *flags |= MS_SYNCHRONOUS; 2280 2281 /* compare new mount options with old ones */ 2282 error = nfs_compare_remount_data(nfss, data); 2283 out: 2284 kfree(data); 2285 return error; 2286 } 2287 EXPORT_SYMBOL_GPL(nfs_remount); 2288 2289 /* 2290 * Initialise the common bits of the superblock 2291 */ 2292 inline void nfs_initialise_sb(struct super_block *sb) 2293 { 2294 struct nfs_server *server = NFS_SB(sb); 2295 2296 sb->s_magic = NFS_SUPER_MAGIC; 2297 2298 /* We probably want something more informative here */ 2299 snprintf(sb->s_id, sizeof(sb->s_id), 2300 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2301 2302 if (sb->s_blocksize == 0) 2303 sb->s_blocksize = nfs_block_bits(server->wsize, 2304 &sb->s_blocksize_bits); 2305 2306 sb->s_bdi = &server->backing_dev_info; 2307 2308 nfs_super_set_maxbytes(sb, server->maxfilesize); 2309 } 2310 2311 /* 2312 * Finish setting up an NFS2/3 superblock 2313 */ 2314 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2315 { 2316 struct nfs_parsed_mount_data *data = mount_info->parsed; 2317 struct nfs_server *server = NFS_SB(sb); 2318 2319 sb->s_blocksize_bits = 0; 2320 sb->s_blocksize = 0; 2321 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2322 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2323 if (data && data->bsize) 2324 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2325 2326 if (server->nfs_client->rpc_ops->version != 2) { 2327 /* The VFS shouldn't apply the umask to mode bits. We will do 2328 * so ourselves when necessary. 2329 */ 2330 sb->s_flags |= MS_POSIXACL; 2331 sb->s_time_gran = 1; 2332 } 2333 2334 nfs_initialise_sb(sb); 2335 } 2336 EXPORT_SYMBOL_GPL(nfs_fill_super); 2337 2338 /* 2339 * Finish setting up a cloned NFS2/3/4 superblock 2340 */ 2341 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2342 { 2343 const struct super_block *old_sb = mount_info->cloned->sb; 2344 struct nfs_server *server = NFS_SB(sb); 2345 2346 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2347 sb->s_blocksize = old_sb->s_blocksize; 2348 sb->s_maxbytes = old_sb->s_maxbytes; 2349 sb->s_xattr = old_sb->s_xattr; 2350 sb->s_op = old_sb->s_op; 2351 sb->s_time_gran = 1; 2352 2353 if (server->nfs_client->rpc_ops->version != 2) { 2354 /* The VFS shouldn't apply the umask to mode bits. We will do 2355 * so ourselves when necessary. 2356 */ 2357 sb->s_flags |= MS_POSIXACL; 2358 } 2359 2360 nfs_initialise_sb(sb); 2361 } 2362 2363 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2364 { 2365 const struct nfs_server *a = s->s_fs_info; 2366 const struct rpc_clnt *clnt_a = a->client; 2367 const struct rpc_clnt *clnt_b = b->client; 2368 2369 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2370 goto Ebusy; 2371 if (a->nfs_client != b->nfs_client) 2372 goto Ebusy; 2373 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 2374 goto Ebusy; 2375 if (a->wsize != b->wsize) 2376 goto Ebusy; 2377 if (a->rsize != b->rsize) 2378 goto Ebusy; 2379 if (a->acregmin != b->acregmin) 2380 goto Ebusy; 2381 if (a->acregmax != b->acregmax) 2382 goto Ebusy; 2383 if (a->acdirmin != b->acdirmin) 2384 goto Ebusy; 2385 if (a->acdirmax != b->acdirmax) 2386 goto Ebusy; 2387 if (b->auth_info.flavor_len > 0 && 2388 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2389 goto Ebusy; 2390 return 1; 2391 Ebusy: 2392 return 0; 2393 } 2394 2395 struct nfs_sb_mountdata { 2396 struct nfs_server *server; 2397 int mntflags; 2398 }; 2399 2400 static int nfs_set_super(struct super_block *s, void *data) 2401 { 2402 struct nfs_sb_mountdata *sb_mntdata = data; 2403 struct nfs_server *server = sb_mntdata->server; 2404 int ret; 2405 2406 s->s_flags = sb_mntdata->mntflags; 2407 s->s_fs_info = server; 2408 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2409 ret = set_anon_super(s, server); 2410 if (ret == 0) 2411 server->s_dev = s->s_dev; 2412 return ret; 2413 } 2414 2415 static int nfs_compare_super_address(struct nfs_server *server1, 2416 struct nfs_server *server2) 2417 { 2418 struct sockaddr *sap1, *sap2; 2419 2420 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2421 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2422 2423 if (sap1->sa_family != sap2->sa_family) 2424 return 0; 2425 2426 switch (sap1->sa_family) { 2427 case AF_INET: { 2428 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2429 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2430 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2431 return 0; 2432 if (sin1->sin_port != sin2->sin_port) 2433 return 0; 2434 break; 2435 } 2436 case AF_INET6: { 2437 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2438 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2439 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2440 return 0; 2441 if (sin1->sin6_port != sin2->sin6_port) 2442 return 0; 2443 break; 2444 } 2445 default: 2446 return 0; 2447 } 2448 2449 return 1; 2450 } 2451 2452 static int nfs_compare_super(struct super_block *sb, void *data) 2453 { 2454 struct nfs_sb_mountdata *sb_mntdata = data; 2455 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2456 int mntflags = sb_mntdata->mntflags; 2457 2458 if (!nfs_compare_super_address(old, server)) 2459 return 0; 2460 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2461 if (old->flags & NFS_MOUNT_UNSHARED) 2462 return 0; 2463 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2464 return 0; 2465 return nfs_compare_mount_options(sb, server, mntflags); 2466 } 2467 2468 #ifdef CONFIG_NFS_FSCACHE 2469 static void nfs_get_cache_cookie(struct super_block *sb, 2470 struct nfs_parsed_mount_data *parsed, 2471 struct nfs_clone_mount *cloned) 2472 { 2473 struct nfs_server *nfss = NFS_SB(sb); 2474 char *uniq = NULL; 2475 int ulen = 0; 2476 2477 nfss->fscache_key = NULL; 2478 nfss->fscache = NULL; 2479 2480 if (parsed) { 2481 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2482 return; 2483 if (parsed->fscache_uniq) { 2484 uniq = parsed->fscache_uniq; 2485 ulen = strlen(parsed->fscache_uniq); 2486 } 2487 } else if (cloned) { 2488 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2489 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2490 return; 2491 if (mnt_s->fscache_key) { 2492 uniq = mnt_s->fscache_key->key.uniquifier; 2493 ulen = mnt_s->fscache_key->key.uniq_len; 2494 }; 2495 } else 2496 return; 2497 2498 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2499 } 2500 #else 2501 static void nfs_get_cache_cookie(struct super_block *sb, 2502 struct nfs_parsed_mount_data *parsed, 2503 struct nfs_clone_mount *cloned) 2504 { 2505 } 2506 #endif 2507 2508 static int nfs_bdi_register(struct nfs_server *server) 2509 { 2510 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2511 } 2512 2513 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2514 struct nfs_mount_info *mount_info) 2515 { 2516 int error; 2517 unsigned long kflags = 0, kflags_out = 0; 2518 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2519 kflags |= SECURITY_LSM_NATIVE_LABELS; 2520 2521 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts, 2522 kflags, &kflags_out); 2523 if (error) 2524 goto err; 2525 2526 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2527 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2528 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2529 err: 2530 return error; 2531 } 2532 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2533 2534 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2535 struct nfs_mount_info *mount_info) 2536 { 2537 /* clone any lsm security options from the parent to the new sb */ 2538 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2539 return -ESTALE; 2540 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2541 } 2542 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2543 2544 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2545 int flags, const char *dev_name, 2546 struct nfs_mount_info *mount_info, 2547 struct nfs_subversion *nfs_mod) 2548 { 2549 struct super_block *s; 2550 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2551 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2552 struct nfs_sb_mountdata sb_mntdata = { 2553 .mntflags = flags, 2554 .server = server, 2555 }; 2556 int error; 2557 2558 if (server->flags & NFS_MOUNT_UNSHARED) 2559 compare_super = NULL; 2560 2561 /* -o noac implies -o sync */ 2562 if (server->flags & NFS_MOUNT_NOAC) 2563 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2564 2565 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) 2566 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS) 2567 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2568 2569 /* Get a superblock - note that we may end up sharing one that already exists */ 2570 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2571 if (IS_ERR(s)) { 2572 mntroot = ERR_CAST(s); 2573 goto out_err_nosb; 2574 } 2575 2576 if (s->s_fs_info != server) { 2577 nfs_free_server(server); 2578 server = NULL; 2579 } else { 2580 error = nfs_bdi_register(server); 2581 if (error) { 2582 mntroot = ERR_PTR(error); 2583 goto error_splat_bdi; 2584 } 2585 server->super = s; 2586 } 2587 2588 if (!s->s_root) { 2589 /* initial superblock/root creation */ 2590 mount_info->fill_super(s, mount_info); 2591 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2592 } 2593 2594 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2595 if (IS_ERR(mntroot)) 2596 goto error_splat_super; 2597 2598 error = mount_info->set_security(s, mntroot, mount_info); 2599 if (error) 2600 goto error_splat_root; 2601 2602 s->s_flags |= MS_ACTIVE; 2603 2604 out: 2605 return mntroot; 2606 2607 out_err_nosb: 2608 nfs_free_server(server); 2609 goto out; 2610 2611 error_splat_root: 2612 dput(mntroot); 2613 mntroot = ERR_PTR(error); 2614 error_splat_super: 2615 if (server && !s->s_root) 2616 bdi_unregister(&server->backing_dev_info); 2617 error_splat_bdi: 2618 deactivate_locked_super(s); 2619 goto out; 2620 } 2621 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2622 2623 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2624 int flags, const char *dev_name, void *raw_data) 2625 { 2626 struct nfs_mount_info mount_info = { 2627 .fill_super = nfs_fill_super, 2628 .set_security = nfs_set_sb_security, 2629 }; 2630 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2631 struct nfs_subversion *nfs_mod; 2632 int error; 2633 2634 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2635 mount_info.mntfh = nfs_alloc_fhandle(); 2636 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2637 goto out; 2638 2639 /* Validate the mount data */ 2640 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2641 if (error == NFS_TEXT_DATA) 2642 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2643 if (error < 0) { 2644 mntroot = ERR_PTR(error); 2645 goto out; 2646 } 2647 2648 nfs_mod = get_nfs_version(mount_info.parsed->version); 2649 if (IS_ERR(nfs_mod)) { 2650 mntroot = ERR_CAST(nfs_mod); 2651 goto out; 2652 } 2653 2654 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2655 2656 put_nfs_version(nfs_mod); 2657 out: 2658 nfs_free_parsed_mount_data(mount_info.parsed); 2659 nfs_free_fhandle(mount_info.mntfh); 2660 return mntroot; 2661 } 2662 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2663 2664 /* 2665 * Ensure that we unregister the bdi before kill_anon_super 2666 * releases the device name 2667 */ 2668 void nfs_put_super(struct super_block *s) 2669 { 2670 struct nfs_server *server = NFS_SB(s); 2671 2672 bdi_unregister(&server->backing_dev_info); 2673 } 2674 EXPORT_SYMBOL_GPL(nfs_put_super); 2675 2676 /* 2677 * Destroy an NFS2/3 superblock 2678 */ 2679 void nfs_kill_super(struct super_block *s) 2680 { 2681 struct nfs_server *server = NFS_SB(s); 2682 2683 kill_anon_super(s); 2684 nfs_fscache_release_super_cookie(s); 2685 nfs_free_server(server); 2686 } 2687 EXPORT_SYMBOL_GPL(nfs_kill_super); 2688 2689 /* 2690 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2691 */ 2692 static struct dentry * 2693 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2694 const char *dev_name, void *raw_data) 2695 { 2696 struct nfs_clone_mount *data = raw_data; 2697 struct nfs_mount_info mount_info = { 2698 .fill_super = nfs_clone_super, 2699 .set_security = nfs_clone_sb_security, 2700 .cloned = data, 2701 }; 2702 struct nfs_server *server; 2703 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2704 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2705 2706 dprintk("--> nfs_xdev_mount()\n"); 2707 2708 mount_info.mntfh = mount_info.cloned->fh; 2709 2710 /* create a new volume representation */ 2711 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2712 2713 if (IS_ERR(server)) 2714 mntroot = ERR_CAST(server); 2715 else 2716 mntroot = nfs_fs_mount_common(server, flags, 2717 dev_name, &mount_info, nfs_mod); 2718 2719 dprintk("<-- nfs_xdev_mount() = %ld\n", 2720 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2721 return mntroot; 2722 } 2723 2724 #if IS_ENABLED(CONFIG_NFS_V4) 2725 2726 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2727 { 2728 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2729 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2730 } 2731 2732 /* 2733 * Validate NFSv4 mount options 2734 */ 2735 static int nfs4_validate_mount_data(void *options, 2736 struct nfs_parsed_mount_data *args, 2737 const char *dev_name) 2738 { 2739 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2740 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2741 char *c; 2742 2743 if (data == NULL) 2744 goto out_no_data; 2745 2746 args->version = 4; 2747 2748 switch (data->version) { 2749 case 1: 2750 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2751 goto out_no_address; 2752 if (data->host_addrlen == 0) 2753 goto out_no_address; 2754 args->nfs_server.addrlen = data->host_addrlen; 2755 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2756 return -EFAULT; 2757 if (!nfs_verify_server_address(sap)) 2758 goto out_no_address; 2759 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2760 2761 if (data->auth_flavourlen) { 2762 rpc_authflavor_t pseudoflavor; 2763 if (data->auth_flavourlen > 1) 2764 goto out_inval_auth; 2765 if (copy_from_user(&pseudoflavor, 2766 data->auth_flavours, 2767 sizeof(pseudoflavor))) 2768 return -EFAULT; 2769 args->selected_flavor = pseudoflavor; 2770 } else 2771 args->selected_flavor = RPC_AUTH_UNIX; 2772 2773 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2774 if (IS_ERR(c)) 2775 return PTR_ERR(c); 2776 args->nfs_server.hostname = c; 2777 2778 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2779 if (IS_ERR(c)) 2780 return PTR_ERR(c); 2781 args->nfs_server.export_path = c; 2782 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2783 2784 c = strndup_user(data->client_addr.data, 16); 2785 if (IS_ERR(c)) 2786 return PTR_ERR(c); 2787 args->client_address = c; 2788 2789 /* 2790 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2791 * can deal with. 2792 */ 2793 2794 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2795 args->rsize = data->rsize; 2796 args->wsize = data->wsize; 2797 args->timeo = data->timeo; 2798 args->retrans = data->retrans; 2799 args->acregmin = data->acregmin; 2800 args->acregmax = data->acregmax; 2801 args->acdirmin = data->acdirmin; 2802 args->acdirmax = data->acdirmax; 2803 args->nfs_server.protocol = data->proto; 2804 nfs_validate_transport_protocol(args); 2805 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2806 goto out_invalid_transport_udp; 2807 2808 break; 2809 default: 2810 return NFS_TEXT_DATA; 2811 } 2812 2813 return 0; 2814 2815 out_no_data: 2816 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2817 return -EINVAL; 2818 2819 out_inval_auth: 2820 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2821 data->auth_flavourlen); 2822 return -EINVAL; 2823 2824 out_no_address: 2825 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2826 return -EINVAL; 2827 2828 out_invalid_transport_udp: 2829 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2830 return -EINVAL; 2831 } 2832 2833 /* 2834 * NFS v4 module parameters need to stay in the 2835 * NFS client for backwards compatibility 2836 */ 2837 unsigned int nfs_callback_set_tcpport; 2838 unsigned short nfs_callback_tcpport; 2839 /* Default cache timeout is 10 minutes */ 2840 unsigned int nfs_idmap_cache_timeout = 600; 2841 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2842 bool nfs4_disable_idmapping = true; 2843 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2844 unsigned short send_implementation_id = 1; 2845 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2846 bool recover_lost_locks = false; 2847 2848 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2849 EXPORT_SYMBOL_GPL(nfs_callback_tcpport); 2850 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2851 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2852 EXPORT_SYMBOL_GPL(max_session_slots); 2853 EXPORT_SYMBOL_GPL(send_implementation_id); 2854 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2855 EXPORT_SYMBOL_GPL(recover_lost_locks); 2856 2857 #define NFS_CALLBACK_MAXPORTNR (65535U) 2858 2859 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2860 { 2861 unsigned long num; 2862 int ret; 2863 2864 if (!val) 2865 return -EINVAL; 2866 ret = kstrtoul(val, 0, &num); 2867 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2868 return -EINVAL; 2869 *((unsigned int *)kp->arg) = num; 2870 return 0; 2871 } 2872 static struct kernel_param_ops param_ops_portnr = { 2873 .set = param_set_portnr, 2874 .get = param_get_uint, 2875 }; 2876 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2877 2878 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2879 module_param(nfs_idmap_cache_timeout, int, 0644); 2880 module_param(nfs4_disable_idmapping, bool, 0644); 2881 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2882 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2883 MODULE_PARM_DESC(nfs4_disable_idmapping, 2884 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2885 module_param(max_session_slots, ushort, 0644); 2886 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2887 "requests the client will negotiate"); 2888 module_param(send_implementation_id, ushort, 0644); 2889 MODULE_PARM_DESC(send_implementation_id, 2890 "Send implementation ID with NFSv4.1 exchange_id"); 2891 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2892 2893 module_param(recover_lost_locks, bool, 0644); 2894 MODULE_PARM_DESC(recover_lost_locks, 2895 "If the server reports that a lock might be lost, " 2896 "try to recover it risking data corruption."); 2897 2898 2899 #endif /* CONFIG_NFS_V4 */ 2900