1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/nfs/super.c 4 * 5 * Copyright (C) 1992 Rick Sladkey 6 * 7 * nfs superblock handling functions 8 * 9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 10 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 11 * 12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 13 * J.S.Peatfield@damtp.cam.ac.uk 14 * 15 * Split from inode.c by David Howells <dhowells@redhat.com> 16 * 17 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a 18 * particular server are held in the same superblock 19 * - NFS superblocks can have several effective roots to the dentry tree 20 * - directory type roots are spliced into the tree when a path from one root reaches the root 21 * of another (see nfs_lookup()) 22 */ 23 24 #include <linux/module.h> 25 #include <linux/init.h> 26 27 #include <linux/time.h> 28 #include <linux/kernel.h> 29 #include <linux/mm.h> 30 #include <linux/string.h> 31 #include <linux/stat.h> 32 #include <linux/errno.h> 33 #include <linux/unistd.h> 34 #include <linux/sunrpc/clnt.h> 35 #include <linux/sunrpc/addr.h> 36 #include <linux/sunrpc/stats.h> 37 #include <linux/sunrpc/metrics.h> 38 #include <linux/sunrpc/xprtsock.h> 39 #include <linux/sunrpc/xprtrdma.h> 40 #include <linux/nfs_fs.h> 41 #include <linux/nfs_mount.h> 42 #include <linux/nfs4_mount.h> 43 #include <linux/lockd/bind.h> 44 #include <linux/seq_file.h> 45 #include <linux/mount.h> 46 #include <linux/namei.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 <linux/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_softerr, 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_softerr, "softerr" }, 130 { Opt_hard, "hard" }, 131 { Opt_deprecated, "intr" }, 132 { Opt_deprecated, "nointr" }, 133 { Opt_posix, "posix" }, 134 { Opt_noposix, "noposix" }, 135 { Opt_cto, "cto" }, 136 { Opt_nocto, "nocto" }, 137 { Opt_ac, "ac" }, 138 { Opt_noac, "noac" }, 139 { Opt_lock, "lock" }, 140 { Opt_nolock, "nolock" }, 141 { Opt_udp, "udp" }, 142 { Opt_tcp, "tcp" }, 143 { Opt_rdma, "rdma" }, 144 { Opt_acl, "acl" }, 145 { Opt_noacl, "noacl" }, 146 { Opt_rdirplus, "rdirplus" }, 147 { Opt_nordirplus, "nordirplus" }, 148 { Opt_sharecache, "sharecache" }, 149 { Opt_nosharecache, "nosharecache" }, 150 { Opt_resvport, "resvport" }, 151 { Opt_noresvport, "noresvport" }, 152 { Opt_fscache, "fsc" }, 153 { Opt_nofscache, "nofsc" }, 154 { Opt_migration, "migration" }, 155 { Opt_nomigration, "nomigration" }, 156 157 { Opt_port, "port=%s" }, 158 { Opt_rsize, "rsize=%s" }, 159 { Opt_wsize, "wsize=%s" }, 160 { Opt_bsize, "bsize=%s" }, 161 { Opt_timeo, "timeo=%s" }, 162 { Opt_retrans, "retrans=%s" }, 163 { Opt_acregmin, "acregmin=%s" }, 164 { Opt_acregmax, "acregmax=%s" }, 165 { Opt_acdirmin, "acdirmin=%s" }, 166 { Opt_acdirmax, "acdirmax=%s" }, 167 { Opt_actimeo, "actimeo=%s" }, 168 { Opt_namelen, "namlen=%s" }, 169 { Opt_mountport, "mountport=%s" }, 170 { Opt_mountvers, "mountvers=%s" }, 171 { Opt_minorversion, "minorversion=%s" }, 172 173 { Opt_nfsvers, "nfsvers=%s" }, 174 { Opt_nfsvers, "vers=%s" }, 175 176 { Opt_sec, "sec=%s" }, 177 { Opt_proto, "proto=%s" }, 178 { Opt_mountproto, "mountproto=%s" }, 179 { Opt_addr, "addr=%s" }, 180 { Opt_clientaddr, "clientaddr=%s" }, 181 { Opt_mounthost, "mounthost=%s" }, 182 { Opt_mountaddr, "mountaddr=%s" }, 183 184 { Opt_lookupcache, "lookupcache=%s" }, 185 { Opt_fscache_uniq, "fsc=%s" }, 186 { Opt_local_lock, "local_lock=%s" }, 187 188 /* The following needs to be listed after all other options */ 189 { Opt_nfsvers, "v%s" }, 190 191 { Opt_err, NULL } 192 }; 193 194 enum { 195 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 196 Opt_xprt_rdma6, 197 198 Opt_xprt_err 199 }; 200 201 static const match_table_t nfs_xprt_protocol_tokens = { 202 { Opt_xprt_udp, "udp" }, 203 { Opt_xprt_udp6, "udp6" }, 204 { Opt_xprt_tcp, "tcp" }, 205 { Opt_xprt_tcp6, "tcp6" }, 206 { Opt_xprt_rdma, "rdma" }, 207 { Opt_xprt_rdma6, "rdma6" }, 208 209 { Opt_xprt_err, NULL } 210 }; 211 212 enum { 213 Opt_sec_none, Opt_sec_sys, 214 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 215 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 216 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 217 218 Opt_sec_err 219 }; 220 221 static const match_table_t nfs_secflavor_tokens = { 222 { Opt_sec_none, "none" }, 223 { Opt_sec_none, "null" }, 224 { Opt_sec_sys, "sys" }, 225 226 { Opt_sec_krb5, "krb5" }, 227 { Opt_sec_krb5i, "krb5i" }, 228 { Opt_sec_krb5p, "krb5p" }, 229 230 { Opt_sec_lkey, "lkey" }, 231 { Opt_sec_lkeyi, "lkeyi" }, 232 { Opt_sec_lkeyp, "lkeyp" }, 233 234 { Opt_sec_spkm, "spkm3" }, 235 { Opt_sec_spkmi, "spkm3i" }, 236 { Opt_sec_spkmp, "spkm3p" }, 237 238 { Opt_sec_err, NULL } 239 }; 240 241 enum { 242 Opt_lookupcache_all, Opt_lookupcache_positive, 243 Opt_lookupcache_none, 244 245 Opt_lookupcache_err 246 }; 247 248 static match_table_t nfs_lookupcache_tokens = { 249 { Opt_lookupcache_all, "all" }, 250 { Opt_lookupcache_positive, "pos" }, 251 { Opt_lookupcache_positive, "positive" }, 252 { Opt_lookupcache_none, "none" }, 253 254 { Opt_lookupcache_err, NULL } 255 }; 256 257 enum { 258 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 259 Opt_local_lock_none, 260 261 Opt_local_lock_err 262 }; 263 264 static match_table_t nfs_local_lock_tokens = { 265 { Opt_local_lock_all, "all" }, 266 { Opt_local_lock_flock, "flock" }, 267 { Opt_local_lock_posix, "posix" }, 268 { Opt_local_lock_none, "none" }, 269 270 { Opt_local_lock_err, NULL } 271 }; 272 273 enum { 274 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 275 Opt_vers_4_1, Opt_vers_4_2, 276 277 Opt_vers_err 278 }; 279 280 static match_table_t nfs_vers_tokens = { 281 { Opt_vers_2, "2" }, 282 { Opt_vers_3, "3" }, 283 { Opt_vers_4, "4" }, 284 { Opt_vers_4_0, "4.0" }, 285 { Opt_vers_4_1, "4.1" }, 286 { Opt_vers_4_2, "4.2" }, 287 288 { Opt_vers_err, NULL } 289 }; 290 291 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 292 int flags, const char *dev_name, void *raw_data); 293 294 struct file_system_type nfs_fs_type = { 295 .owner = THIS_MODULE, 296 .name = "nfs", 297 .mount = nfs_fs_mount, 298 .kill_sb = nfs_kill_super, 299 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 300 }; 301 MODULE_ALIAS_FS("nfs"); 302 EXPORT_SYMBOL_GPL(nfs_fs_type); 303 304 struct file_system_type nfs_xdev_fs_type = { 305 .owner = THIS_MODULE, 306 .name = "nfs", 307 .mount = nfs_xdev_mount, 308 .kill_sb = nfs_kill_super, 309 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 310 }; 311 312 const struct super_operations nfs_sops = { 313 .alloc_inode = nfs_alloc_inode, 314 .free_inode = nfs_free_inode, 315 .write_inode = nfs_write_inode, 316 .drop_inode = nfs_drop_inode, 317 .statfs = nfs_statfs, 318 .evict_inode = nfs_evict_inode, 319 .umount_begin = nfs_umount_begin, 320 .show_options = nfs_show_options, 321 .show_devname = nfs_show_devname, 322 .show_path = nfs_show_path, 323 .show_stats = nfs_show_stats, 324 .remount_fs = nfs_remount, 325 }; 326 EXPORT_SYMBOL_GPL(nfs_sops); 327 328 #if IS_ENABLED(CONFIG_NFS_V4) 329 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 330 static int nfs4_validate_mount_data(void *options, 331 struct nfs_parsed_mount_data *args, const char *dev_name); 332 333 struct file_system_type nfs4_fs_type = { 334 .owner = THIS_MODULE, 335 .name = "nfs4", 336 .mount = nfs_fs_mount, 337 .kill_sb = nfs_kill_super, 338 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 339 }; 340 MODULE_ALIAS_FS("nfs4"); 341 MODULE_ALIAS("nfs4"); 342 EXPORT_SYMBOL_GPL(nfs4_fs_type); 343 344 static int __init register_nfs4_fs(void) 345 { 346 return register_filesystem(&nfs4_fs_type); 347 } 348 349 static void unregister_nfs4_fs(void) 350 { 351 unregister_filesystem(&nfs4_fs_type); 352 } 353 #else 354 static int __init register_nfs4_fs(void) 355 { 356 return 0; 357 } 358 359 static void unregister_nfs4_fs(void) 360 { 361 } 362 #endif 363 364 static struct shrinker acl_shrinker = { 365 .count_objects = nfs_access_cache_count, 366 .scan_objects = nfs_access_cache_scan, 367 .seeks = DEFAULT_SEEKS, 368 }; 369 370 /* 371 * Register the NFS filesystems 372 */ 373 int __init register_nfs_fs(void) 374 { 375 int ret; 376 377 ret = register_filesystem(&nfs_fs_type); 378 if (ret < 0) 379 goto error_0; 380 381 ret = register_nfs4_fs(); 382 if (ret < 0) 383 goto error_1; 384 385 ret = nfs_register_sysctl(); 386 if (ret < 0) 387 goto error_2; 388 ret = register_shrinker(&acl_shrinker); 389 if (ret < 0) 390 goto error_3; 391 return 0; 392 error_3: 393 nfs_unregister_sysctl(); 394 error_2: 395 unregister_nfs4_fs(); 396 error_1: 397 unregister_filesystem(&nfs_fs_type); 398 error_0: 399 return ret; 400 } 401 402 /* 403 * Unregister the NFS filesystems 404 */ 405 void __exit unregister_nfs_fs(void) 406 { 407 unregister_shrinker(&acl_shrinker); 408 nfs_unregister_sysctl(); 409 unregister_nfs4_fs(); 410 unregister_filesystem(&nfs_fs_type); 411 } 412 413 bool nfs_sb_active(struct super_block *sb) 414 { 415 struct nfs_server *server = NFS_SB(sb); 416 417 if (!atomic_inc_not_zero(&sb->s_active)) 418 return false; 419 if (atomic_inc_return(&server->active) != 1) 420 atomic_dec(&sb->s_active); 421 return true; 422 } 423 EXPORT_SYMBOL_GPL(nfs_sb_active); 424 425 void nfs_sb_deactive(struct super_block *sb) 426 { 427 struct nfs_server *server = NFS_SB(sb); 428 429 if (atomic_dec_and_test(&server->active)) 430 deactivate_super(sb); 431 } 432 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 433 434 /* 435 * Deliver file system statistics to userspace 436 */ 437 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 438 { 439 struct nfs_server *server = NFS_SB(dentry->d_sb); 440 unsigned char blockbits; 441 unsigned long blockres; 442 struct nfs_fh *fh = NFS_FH(d_inode(dentry)); 443 struct nfs_fsstat res; 444 int error = -ENOMEM; 445 446 res.fattr = nfs_alloc_fattr(); 447 if (res.fattr == NULL) 448 goto out_err; 449 450 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 451 if (unlikely(error == -ESTALE)) { 452 struct dentry *pd_dentry; 453 454 pd_dentry = dget_parent(dentry); 455 if (pd_dentry != NULL) { 456 nfs_zap_caches(d_inode(pd_dentry)); 457 dput(pd_dentry); 458 } 459 } 460 nfs_free_fattr(res.fattr); 461 if (error < 0) 462 goto out_err; 463 464 buf->f_type = NFS_SUPER_MAGIC; 465 466 /* 467 * Current versions of glibc do not correctly handle the 468 * case where f_frsize != f_bsize. Eventually we want to 469 * report the value of wtmult in this field. 470 */ 471 buf->f_frsize = dentry->d_sb->s_blocksize; 472 473 /* 474 * On most *nix systems, f_blocks, f_bfree, and f_bavail 475 * are reported in units of f_frsize. Linux hasn't had 476 * an f_frsize field in its statfs struct until recently, 477 * thus historically Linux's sys_statfs reports these 478 * fields in units of f_bsize. 479 */ 480 buf->f_bsize = dentry->d_sb->s_blocksize; 481 blockbits = dentry->d_sb->s_blocksize_bits; 482 blockres = (1 << blockbits) - 1; 483 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 484 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 485 buf->f_bavail = (res.abytes + blockres) >> blockbits; 486 487 buf->f_files = res.tfiles; 488 buf->f_ffree = res.afiles; 489 490 buf->f_namelen = server->namelen; 491 492 return 0; 493 494 out_err: 495 dprintk("%s: statfs error = %d\n", __func__, -error); 496 return error; 497 } 498 EXPORT_SYMBOL_GPL(nfs_statfs); 499 500 /* 501 * Map the security flavour number to a name 502 */ 503 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 504 { 505 static const struct { 506 rpc_authflavor_t flavour; 507 const char *str; 508 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { 509 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ 510 { RPC_AUTH_NULL, "null" }, 511 { RPC_AUTH_UNIX, "sys" }, 512 { RPC_AUTH_GSS_KRB5, "krb5" }, 513 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 514 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 515 { RPC_AUTH_GSS_LKEY, "lkey" }, 516 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 517 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 518 { RPC_AUTH_GSS_SPKM, "spkm" }, 519 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 520 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 521 { UINT_MAX, "unknown" } 522 }; 523 int i; 524 525 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 526 if (sec_flavours[i].flavour == flavour) 527 break; 528 } 529 return sec_flavours[i].str; 530 } 531 532 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 533 int showdefaults) 534 { 535 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 536 char *proto = NULL; 537 538 switch (sap->sa_family) { 539 case AF_INET: 540 switch (nfss->mountd_protocol) { 541 case IPPROTO_UDP: 542 proto = RPCBIND_NETID_UDP; 543 break; 544 case IPPROTO_TCP: 545 proto = RPCBIND_NETID_TCP; 546 break; 547 } 548 break; 549 case AF_INET6: 550 switch (nfss->mountd_protocol) { 551 case IPPROTO_UDP: 552 proto = RPCBIND_NETID_UDP6; 553 break; 554 case IPPROTO_TCP: 555 proto = RPCBIND_NETID_TCP6; 556 break; 557 } 558 break; 559 } 560 if (proto || showdefaults) 561 seq_printf(m, ",mountproto=%s", proto ?: "auto"); 562 } 563 564 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 565 int showdefaults) 566 { 567 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 568 569 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 570 return; 571 572 switch (sap->sa_family) { 573 case AF_INET: { 574 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 575 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 576 break; 577 } 578 case AF_INET6: { 579 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 580 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 581 break; 582 } 583 default: 584 if (showdefaults) 585 seq_printf(m, ",mountaddr=unspecified"); 586 } 587 588 if (nfss->mountd_version || showdefaults) 589 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 590 if ((nfss->mountd_port && 591 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 592 showdefaults) 593 seq_printf(m, ",mountport=%u", nfss->mountd_port); 594 595 nfs_show_mountd_netid(m, nfss, showdefaults); 596 } 597 598 #if IS_ENABLED(CONFIG_NFS_V4) 599 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 600 int showdefaults) 601 { 602 struct nfs_client *clp = nfss->nfs_client; 603 604 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 605 } 606 #else 607 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 608 int showdefaults) 609 { 610 } 611 #endif 612 613 static void nfs_show_nfs_version(struct seq_file *m, 614 unsigned int version, 615 unsigned int minorversion) 616 { 617 seq_printf(m, ",vers=%u", version); 618 if (version == 4) 619 seq_printf(m, ".%u", minorversion); 620 } 621 622 /* 623 * Describe the mount options in force on this server representation 624 */ 625 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 626 int showdefaults) 627 { 628 static const struct proc_nfs_info { 629 int flag; 630 const char *str; 631 const char *nostr; 632 } nfs_info[] = { 633 { NFS_MOUNT_SOFT, ",soft", "" }, 634 { NFS_MOUNT_SOFTERR, ",softerr", "" }, 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 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))) 665 seq_puts(m, ",hard"); 666 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 667 if (nfss->flags & nfs_infop->flag) 668 seq_puts(m, nfs_infop->str); 669 else 670 seq_puts(m, nfs_infop->nostr); 671 } 672 rcu_read_lock(); 673 seq_printf(m, ",proto=%s", 674 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 675 rcu_read_unlock(); 676 if (version == 4) { 677 if (nfss->port != NFS_PORT) 678 seq_printf(m, ",port=%u", nfss->port); 679 } else 680 if (nfss->port) 681 seq_printf(m, ",port=%u", nfss->port); 682 683 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 684 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 685 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 686 687 if (version != 4) 688 nfs_show_mountd_options(m, nfss, showdefaults); 689 else 690 nfs_show_nfsv4_options(m, nfss, showdefaults); 691 692 if (nfss->options & NFS_OPTION_FSCACHE) 693 seq_printf(m, ",fsc"); 694 695 if (nfss->options & NFS_OPTION_MIGRATION) 696 seq_printf(m, ",migration"); 697 698 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 699 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 700 seq_printf(m, ",lookupcache=none"); 701 else 702 seq_printf(m, ",lookupcache=pos"); 703 } 704 705 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 706 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 707 708 if (!local_flock && !local_fcntl) 709 seq_printf(m, ",local_lock=none"); 710 else if (local_flock && local_fcntl) 711 seq_printf(m, ",local_lock=all"); 712 else if (local_flock) 713 seq_printf(m, ",local_lock=flock"); 714 else 715 seq_printf(m, ",local_lock=posix"); 716 } 717 718 /* 719 * Describe the mount options on this VFS mountpoint 720 */ 721 int nfs_show_options(struct seq_file *m, struct dentry *root) 722 { 723 struct nfs_server *nfss = NFS_SB(root->d_sb); 724 725 nfs_show_mount_options(m, nfss, 0); 726 727 rcu_read_lock(); 728 seq_printf(m, ",addr=%s", 729 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 730 RPC_DISPLAY_ADDR)); 731 rcu_read_unlock(); 732 733 return 0; 734 } 735 EXPORT_SYMBOL_GPL(nfs_show_options); 736 737 #if IS_ENABLED(CONFIG_NFS_V4) 738 #ifdef CONFIG_NFS_V4_1 739 static void show_sessions(struct seq_file *m, struct nfs_server *server) 740 { 741 if (nfs4_has_session(server->nfs_client)) 742 seq_printf(m, ",sessions"); 743 } 744 #else 745 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 746 #endif 747 #endif 748 749 #ifdef CONFIG_NFS_V4_1 750 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 751 { 752 seq_printf(m, ",pnfs="); 753 if (server->pnfs_curr_ld) 754 seq_printf(m, "%s", server->pnfs_curr_ld->name); 755 else 756 seq_printf(m, "not configured"); 757 } 758 759 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 760 { 761 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 762 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 763 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 764 "date='%llu,%u'", 765 impl_id->name, impl_id->domain, 766 impl_id->date.seconds, impl_id->date.nseconds); 767 } 768 } 769 #else 770 #if IS_ENABLED(CONFIG_NFS_V4) 771 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 772 { 773 } 774 #endif 775 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 776 { 777 } 778 #endif 779 780 int nfs_show_devname(struct seq_file *m, struct dentry *root) 781 { 782 char *page = (char *) __get_free_page(GFP_KERNEL); 783 char *devname, *dummy; 784 int err = 0; 785 if (!page) 786 return -ENOMEM; 787 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 788 if (IS_ERR(devname)) 789 err = PTR_ERR(devname); 790 else 791 seq_escape(m, devname, " \t\n\\"); 792 free_page((unsigned long)page); 793 return err; 794 } 795 EXPORT_SYMBOL_GPL(nfs_show_devname); 796 797 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 798 { 799 seq_puts(m, "/"); 800 return 0; 801 } 802 EXPORT_SYMBOL_GPL(nfs_show_path); 803 804 /* 805 * Present statistical information for this VFS mountpoint 806 */ 807 int nfs_show_stats(struct seq_file *m, struct dentry *root) 808 { 809 int i, cpu; 810 struct nfs_server *nfss = NFS_SB(root->d_sb); 811 struct rpc_auth *auth = nfss->client->cl_auth; 812 struct nfs_iostats totals = { }; 813 814 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 815 816 /* 817 * Display all mount option settings 818 */ 819 seq_printf(m, "\n\topts:\t"); 820 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw"); 821 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : ""); 822 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : ""); 823 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : ""); 824 nfs_show_mount_options(m, nfss, 1); 825 826 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 827 828 show_implementation_id(m, nfss); 829 830 seq_printf(m, "\n\tcaps:\t"); 831 seq_printf(m, "caps=0x%x", nfss->caps); 832 seq_printf(m, ",wtmult=%u", nfss->wtmult); 833 seq_printf(m, ",dtsize=%u", nfss->dtsize); 834 seq_printf(m, ",bsize=%u", nfss->bsize); 835 seq_printf(m, ",namlen=%u", nfss->namelen); 836 837 #if IS_ENABLED(CONFIG_NFS_V4) 838 if (nfss->nfs_client->rpc_ops->version == 4) { 839 seq_printf(m, "\n\tnfsv4:\t"); 840 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 841 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 842 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 843 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 844 show_sessions(m, nfss); 845 show_pnfs(m, nfss); 846 } 847 #endif 848 849 /* 850 * Display security flavor in effect for this mount 851 */ 852 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 853 if (auth->au_flavor) 854 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 855 856 /* 857 * Display superblock I/O counters 858 */ 859 for_each_possible_cpu(cpu) { 860 struct nfs_iostats *stats; 861 862 preempt_disable(); 863 stats = per_cpu_ptr(nfss->io_stats, cpu); 864 865 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 866 totals.events[i] += stats->events[i]; 867 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 868 totals.bytes[i] += stats->bytes[i]; 869 #ifdef CONFIG_NFS_FSCACHE 870 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 871 totals.fscache[i] += stats->fscache[i]; 872 #endif 873 874 preempt_enable(); 875 } 876 877 seq_printf(m, "\n\tevents:\t"); 878 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 879 seq_printf(m, "%lu ", totals.events[i]); 880 seq_printf(m, "\n\tbytes:\t"); 881 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 882 seq_printf(m, "%Lu ", totals.bytes[i]); 883 #ifdef CONFIG_NFS_FSCACHE 884 if (nfss->options & NFS_OPTION_FSCACHE) { 885 seq_printf(m, "\n\tfsc:\t"); 886 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 887 seq_printf(m, "%Lu ", totals.fscache[i]); 888 } 889 #endif 890 seq_printf(m, "\n"); 891 892 rpc_clnt_show_stats(m, nfss->client); 893 894 return 0; 895 } 896 EXPORT_SYMBOL_GPL(nfs_show_stats); 897 898 /* 899 * Begin unmount by attempting to remove all automounted mountpoints we added 900 * in response to xdev traversals and referrals 901 */ 902 void nfs_umount_begin(struct super_block *sb) 903 { 904 struct nfs_server *server; 905 struct rpc_clnt *rpc; 906 907 server = NFS_SB(sb); 908 /* -EIO all pending I/O */ 909 rpc = server->client_acl; 910 if (!IS_ERR(rpc)) 911 rpc_killall_tasks(rpc); 912 rpc = server->client; 913 if (!IS_ERR(rpc)) 914 rpc_killall_tasks(rpc); 915 } 916 EXPORT_SYMBOL_GPL(nfs_umount_begin); 917 918 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 919 { 920 struct nfs_parsed_mount_data *data; 921 922 data = kzalloc(sizeof(*data), GFP_KERNEL); 923 if (data) { 924 data->timeo = NFS_UNSPEC_TIMEO; 925 data->retrans = NFS_UNSPEC_RETRANS; 926 data->acregmin = NFS_DEF_ACREGMIN; 927 data->acregmax = NFS_DEF_ACREGMAX; 928 data->acdirmin = NFS_DEF_ACDIRMIN; 929 data->acdirmax = NFS_DEF_ACDIRMAX; 930 data->mount_server.port = NFS_UNSPEC_PORT; 931 data->nfs_server.port = NFS_UNSPEC_PORT; 932 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 933 data->selected_flavor = RPC_AUTH_MAXFLAVOR; 934 data->minorversion = 0; 935 data->need_mount = true; 936 data->net = current->nsproxy->net_ns; 937 data->lsm_opts = NULL; 938 } 939 return data; 940 } 941 942 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 943 { 944 if (data) { 945 kfree(data->client_address); 946 kfree(data->mount_server.hostname); 947 kfree(data->nfs_server.export_path); 948 kfree(data->nfs_server.hostname); 949 kfree(data->fscache_uniq); 950 security_free_mnt_opts(&data->lsm_opts); 951 kfree(data); 952 } 953 } 954 955 /* 956 * Sanity-check a server address provided by the mount command. 957 * 958 * Address family must be initialized, and address must not be 959 * the ANY address for that family. 960 */ 961 static int nfs_verify_server_address(struct sockaddr *addr) 962 { 963 switch (addr->sa_family) { 964 case AF_INET: { 965 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 966 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 967 } 968 case AF_INET6: { 969 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 970 return !ipv6_addr_any(sa); 971 } 972 } 973 974 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 975 return 0; 976 } 977 978 /* 979 * Select between a default port value and a user-specified port value. 980 * If a zero value is set, then autobind will be used. 981 */ 982 static void nfs_set_port(struct sockaddr *sap, int *port, 983 const unsigned short default_port) 984 { 985 if (*port == NFS_UNSPEC_PORT) 986 *port = default_port; 987 988 rpc_set_port(sap, *port); 989 } 990 991 /* 992 * Sanity check the NFS transport protocol. 993 * 994 */ 995 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 996 { 997 switch (mnt->nfs_server.protocol) { 998 case XPRT_TRANSPORT_UDP: 999 case XPRT_TRANSPORT_TCP: 1000 case XPRT_TRANSPORT_RDMA: 1001 break; 1002 default: 1003 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1004 } 1005 } 1006 1007 /* 1008 * For text based NFSv2/v3 mounts, the mount protocol transport default 1009 * settings should depend upon the specified NFS transport. 1010 */ 1011 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1012 { 1013 nfs_validate_transport_protocol(mnt); 1014 1015 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1016 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1017 return; 1018 switch (mnt->nfs_server.protocol) { 1019 case XPRT_TRANSPORT_UDP: 1020 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1021 break; 1022 case XPRT_TRANSPORT_TCP: 1023 case XPRT_TRANSPORT_RDMA: 1024 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1025 } 1026 } 1027 1028 /* 1029 * Add 'flavor' to 'auth_info' if not already present. 1030 * Returns true if 'flavor' ends up in the list, false otherwise 1031 */ 1032 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, 1033 rpc_authflavor_t flavor) 1034 { 1035 unsigned int i; 1036 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors); 1037 1038 /* make sure this flavor isn't already in the list */ 1039 for (i = 0; i < auth_info->flavor_len; i++) { 1040 if (flavor == auth_info->flavors[i]) 1041 return true; 1042 } 1043 1044 if (auth_info->flavor_len + 1 >= max_flavor_len) { 1045 dfprintk(MOUNT, "NFS: too many sec= flavors\n"); 1046 return false; 1047 } 1048 1049 auth_info->flavors[auth_info->flavor_len++] = flavor; 1050 return true; 1051 } 1052 1053 /* 1054 * Return true if 'match' is in auth_info or auth_info is empty. 1055 * Return false otherwise. 1056 */ 1057 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 1058 rpc_authflavor_t match) 1059 { 1060 int i; 1061 1062 if (!auth_info->flavor_len) 1063 return true; 1064 1065 for (i = 0; i < auth_info->flavor_len; i++) { 1066 if (auth_info->flavors[i] == match) 1067 return true; 1068 } 1069 return false; 1070 } 1071 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 1072 1073 /* 1074 * Parse the value of the 'sec=' option. 1075 */ 1076 static int nfs_parse_security_flavors(char *value, 1077 struct nfs_parsed_mount_data *mnt) 1078 { 1079 substring_t args[MAX_OPT_ARGS]; 1080 rpc_authflavor_t pseudoflavor; 1081 char *p; 1082 1083 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1084 1085 while ((p = strsep(&value, ":")) != NULL) { 1086 switch (match_token(p, nfs_secflavor_tokens, args)) { 1087 case Opt_sec_none: 1088 pseudoflavor = RPC_AUTH_NULL; 1089 break; 1090 case Opt_sec_sys: 1091 pseudoflavor = RPC_AUTH_UNIX; 1092 break; 1093 case Opt_sec_krb5: 1094 pseudoflavor = RPC_AUTH_GSS_KRB5; 1095 break; 1096 case Opt_sec_krb5i: 1097 pseudoflavor = RPC_AUTH_GSS_KRB5I; 1098 break; 1099 case Opt_sec_krb5p: 1100 pseudoflavor = RPC_AUTH_GSS_KRB5P; 1101 break; 1102 case Opt_sec_lkey: 1103 pseudoflavor = RPC_AUTH_GSS_LKEY; 1104 break; 1105 case Opt_sec_lkeyi: 1106 pseudoflavor = RPC_AUTH_GSS_LKEYI; 1107 break; 1108 case Opt_sec_lkeyp: 1109 pseudoflavor = RPC_AUTH_GSS_LKEYP; 1110 break; 1111 case Opt_sec_spkm: 1112 pseudoflavor = RPC_AUTH_GSS_SPKM; 1113 break; 1114 case Opt_sec_spkmi: 1115 pseudoflavor = RPC_AUTH_GSS_SPKMI; 1116 break; 1117 case Opt_sec_spkmp: 1118 pseudoflavor = RPC_AUTH_GSS_SPKMP; 1119 break; 1120 default: 1121 dfprintk(MOUNT, 1122 "NFS: sec= option '%s' not recognized\n", p); 1123 return 0; 1124 } 1125 1126 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor)) 1127 return 0; 1128 } 1129 1130 return 1; 1131 } 1132 1133 static int nfs_parse_version_string(char *string, 1134 struct nfs_parsed_mount_data *mnt, 1135 substring_t *args) 1136 { 1137 mnt->flags &= ~NFS_MOUNT_VER3; 1138 switch (match_token(string, nfs_vers_tokens, args)) { 1139 case Opt_vers_2: 1140 mnt->version = 2; 1141 break; 1142 case Opt_vers_3: 1143 mnt->flags |= NFS_MOUNT_VER3; 1144 mnt->version = 3; 1145 break; 1146 case Opt_vers_4: 1147 /* Backward compatibility option. In future, 1148 * the mount program should always supply 1149 * a NFSv4 minor version number. 1150 */ 1151 mnt->version = 4; 1152 break; 1153 case Opt_vers_4_0: 1154 mnt->version = 4; 1155 mnt->minorversion = 0; 1156 break; 1157 case Opt_vers_4_1: 1158 mnt->version = 4; 1159 mnt->minorversion = 1; 1160 break; 1161 case Opt_vers_4_2: 1162 mnt->version = 4; 1163 mnt->minorversion = 2; 1164 break; 1165 default: 1166 return 0; 1167 } 1168 return 1; 1169 } 1170 1171 static int nfs_get_option_str(substring_t args[], char **option) 1172 { 1173 kfree(*option); 1174 *option = match_strdup(args); 1175 return !*option; 1176 } 1177 1178 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1179 { 1180 int rc; 1181 char *string; 1182 1183 string = match_strdup(args); 1184 if (string == NULL) 1185 return -ENOMEM; 1186 rc = kstrtoul(string, 10, option); 1187 kfree(string); 1188 1189 return rc; 1190 } 1191 1192 static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option, 1193 unsigned long l_bound, unsigned long u_bound) 1194 { 1195 int ret; 1196 1197 ret = nfs_get_option_ul(args, option); 1198 if (ret != 0) 1199 return ret; 1200 if (*option < l_bound || *option > u_bound) 1201 return -ERANGE; 1202 return 0; 1203 } 1204 1205 /* 1206 * Error-check and convert a string of mount options from user space into 1207 * a data structure. The whole mount string is processed; bad options are 1208 * skipped as they are encountered. If there were no errors, return 1; 1209 * otherwise return 0 (zero). 1210 */ 1211 static int nfs_parse_mount_options(char *raw, 1212 struct nfs_parsed_mount_data *mnt) 1213 { 1214 char *p, *string; 1215 int rc, sloppy = 0, invalid_option = 0; 1216 unsigned short protofamily = AF_UNSPEC; 1217 unsigned short mountfamily = AF_UNSPEC; 1218 1219 if (!raw) { 1220 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1221 return 1; 1222 } 1223 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1224 1225 rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts); 1226 if (rc) 1227 goto out_security_failure; 1228 1229 while ((p = strsep(&raw, ",")) != NULL) { 1230 substring_t args[MAX_OPT_ARGS]; 1231 unsigned long option; 1232 int token; 1233 1234 if (!*p) 1235 continue; 1236 1237 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1238 1239 token = match_token(p, nfs_mount_option_tokens, args); 1240 switch (token) { 1241 1242 /* 1243 * boolean options: foo/nofoo 1244 */ 1245 case Opt_soft: 1246 mnt->flags |= NFS_MOUNT_SOFT; 1247 mnt->flags &= ~NFS_MOUNT_SOFTERR; 1248 break; 1249 case Opt_softerr: 1250 mnt->flags |= NFS_MOUNT_SOFTERR; 1251 mnt->flags &= ~NFS_MOUNT_SOFT; 1252 break; 1253 case Opt_hard: 1254 mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR); 1255 break; 1256 case Opt_posix: 1257 mnt->flags |= NFS_MOUNT_POSIX; 1258 break; 1259 case Opt_noposix: 1260 mnt->flags &= ~NFS_MOUNT_POSIX; 1261 break; 1262 case Opt_cto: 1263 mnt->flags &= ~NFS_MOUNT_NOCTO; 1264 break; 1265 case Opt_nocto: 1266 mnt->flags |= NFS_MOUNT_NOCTO; 1267 break; 1268 case Opt_ac: 1269 mnt->flags &= ~NFS_MOUNT_NOAC; 1270 break; 1271 case Opt_noac: 1272 mnt->flags |= NFS_MOUNT_NOAC; 1273 break; 1274 case Opt_lock: 1275 mnt->flags &= ~NFS_MOUNT_NONLM; 1276 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1277 NFS_MOUNT_LOCAL_FCNTL); 1278 break; 1279 case Opt_nolock: 1280 mnt->flags |= NFS_MOUNT_NONLM; 1281 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1282 NFS_MOUNT_LOCAL_FCNTL); 1283 break; 1284 case Opt_udp: 1285 mnt->flags &= ~NFS_MOUNT_TCP; 1286 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1287 break; 1288 case Opt_tcp: 1289 mnt->flags |= NFS_MOUNT_TCP; 1290 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1291 break; 1292 case Opt_rdma: 1293 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1294 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1295 xprt_load_transport(p); 1296 break; 1297 case Opt_acl: 1298 mnt->flags &= ~NFS_MOUNT_NOACL; 1299 break; 1300 case Opt_noacl: 1301 mnt->flags |= NFS_MOUNT_NOACL; 1302 break; 1303 case Opt_rdirplus: 1304 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1305 break; 1306 case Opt_nordirplus: 1307 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1308 break; 1309 case Opt_sharecache: 1310 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1311 break; 1312 case Opt_nosharecache: 1313 mnt->flags |= NFS_MOUNT_UNSHARED; 1314 break; 1315 case Opt_resvport: 1316 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1317 break; 1318 case Opt_noresvport: 1319 mnt->flags |= NFS_MOUNT_NORESVPORT; 1320 break; 1321 case Opt_fscache: 1322 mnt->options |= NFS_OPTION_FSCACHE; 1323 kfree(mnt->fscache_uniq); 1324 mnt->fscache_uniq = NULL; 1325 break; 1326 case Opt_nofscache: 1327 mnt->options &= ~NFS_OPTION_FSCACHE; 1328 kfree(mnt->fscache_uniq); 1329 mnt->fscache_uniq = NULL; 1330 break; 1331 case Opt_migration: 1332 mnt->options |= NFS_OPTION_MIGRATION; 1333 break; 1334 case Opt_nomigration: 1335 mnt->options &= ~NFS_OPTION_MIGRATION; 1336 break; 1337 1338 /* 1339 * options that take numeric values 1340 */ 1341 case Opt_port: 1342 if (nfs_get_option_ul(args, &option) || 1343 option > USHRT_MAX) 1344 goto out_invalid_value; 1345 mnt->nfs_server.port = option; 1346 break; 1347 case Opt_rsize: 1348 if (nfs_get_option_ul(args, &option)) 1349 goto out_invalid_value; 1350 mnt->rsize = option; 1351 break; 1352 case Opt_wsize: 1353 if (nfs_get_option_ul(args, &option)) 1354 goto out_invalid_value; 1355 mnt->wsize = option; 1356 break; 1357 case Opt_bsize: 1358 if (nfs_get_option_ul(args, &option)) 1359 goto out_invalid_value; 1360 mnt->bsize = option; 1361 break; 1362 case Opt_timeo: 1363 if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX)) 1364 goto out_invalid_value; 1365 mnt->timeo = option; 1366 break; 1367 case Opt_retrans: 1368 if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX)) 1369 goto out_invalid_value; 1370 mnt->retrans = option; 1371 break; 1372 case Opt_acregmin: 1373 if (nfs_get_option_ul(args, &option)) 1374 goto out_invalid_value; 1375 mnt->acregmin = option; 1376 break; 1377 case Opt_acregmax: 1378 if (nfs_get_option_ul(args, &option)) 1379 goto out_invalid_value; 1380 mnt->acregmax = option; 1381 break; 1382 case Opt_acdirmin: 1383 if (nfs_get_option_ul(args, &option)) 1384 goto out_invalid_value; 1385 mnt->acdirmin = option; 1386 break; 1387 case Opt_acdirmax: 1388 if (nfs_get_option_ul(args, &option)) 1389 goto out_invalid_value; 1390 mnt->acdirmax = option; 1391 break; 1392 case Opt_actimeo: 1393 if (nfs_get_option_ul(args, &option)) 1394 goto out_invalid_value; 1395 mnt->acregmin = mnt->acregmax = 1396 mnt->acdirmin = mnt->acdirmax = option; 1397 break; 1398 case Opt_namelen: 1399 if (nfs_get_option_ul(args, &option)) 1400 goto out_invalid_value; 1401 mnt->namlen = option; 1402 break; 1403 case Opt_mountport: 1404 if (nfs_get_option_ul(args, &option) || 1405 option > USHRT_MAX) 1406 goto out_invalid_value; 1407 mnt->mount_server.port = option; 1408 break; 1409 case Opt_mountvers: 1410 if (nfs_get_option_ul(args, &option) || 1411 option < NFS_MNT_VERSION || 1412 option > NFS_MNT3_VERSION) 1413 goto out_invalid_value; 1414 mnt->mount_server.version = option; 1415 break; 1416 case Opt_minorversion: 1417 if (nfs_get_option_ul(args, &option)) 1418 goto out_invalid_value; 1419 if (option > NFS4_MAX_MINOR_VERSION) 1420 goto out_invalid_value; 1421 mnt->minorversion = option; 1422 break; 1423 1424 /* 1425 * options that take text values 1426 */ 1427 case Opt_nfsvers: 1428 string = match_strdup(args); 1429 if (string == NULL) 1430 goto out_nomem; 1431 rc = nfs_parse_version_string(string, mnt, args); 1432 kfree(string); 1433 if (!rc) 1434 goto out_invalid_value; 1435 break; 1436 case Opt_sec: 1437 string = match_strdup(args); 1438 if (string == NULL) 1439 goto out_nomem; 1440 rc = nfs_parse_security_flavors(string, mnt); 1441 kfree(string); 1442 if (!rc) { 1443 dfprintk(MOUNT, "NFS: unrecognized " 1444 "security flavor\n"); 1445 return 0; 1446 } 1447 break; 1448 case Opt_proto: 1449 string = match_strdup(args); 1450 if (string == NULL) 1451 goto out_nomem; 1452 token = match_token(string, 1453 nfs_xprt_protocol_tokens, args); 1454 1455 protofamily = AF_INET; 1456 switch (token) { 1457 case Opt_xprt_udp6: 1458 protofamily = AF_INET6; 1459 /* fall through */ 1460 case Opt_xprt_udp: 1461 mnt->flags &= ~NFS_MOUNT_TCP; 1462 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1463 break; 1464 case Opt_xprt_tcp6: 1465 protofamily = AF_INET6; 1466 /* fall through */ 1467 case Opt_xprt_tcp: 1468 mnt->flags |= NFS_MOUNT_TCP; 1469 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1470 break; 1471 case Opt_xprt_rdma6: 1472 protofamily = AF_INET6; 1473 /* fall through */ 1474 case Opt_xprt_rdma: 1475 /* vector side protocols to TCP */ 1476 mnt->flags |= NFS_MOUNT_TCP; 1477 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1478 xprt_load_transport(string); 1479 break; 1480 default: 1481 dfprintk(MOUNT, "NFS: unrecognized " 1482 "transport protocol\n"); 1483 kfree(string); 1484 return 0; 1485 } 1486 kfree(string); 1487 break; 1488 case Opt_mountproto: 1489 string = match_strdup(args); 1490 if (string == NULL) 1491 goto out_nomem; 1492 token = match_token(string, 1493 nfs_xprt_protocol_tokens, args); 1494 kfree(string); 1495 1496 mountfamily = AF_INET; 1497 switch (token) { 1498 case Opt_xprt_udp6: 1499 mountfamily = AF_INET6; 1500 /* fall through */ 1501 case Opt_xprt_udp: 1502 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1503 break; 1504 case Opt_xprt_tcp6: 1505 mountfamily = AF_INET6; 1506 /* fall through */ 1507 case Opt_xprt_tcp: 1508 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1509 break; 1510 case Opt_xprt_rdma: /* not used for side protocols */ 1511 default: 1512 dfprintk(MOUNT, "NFS: unrecognized " 1513 "transport protocol\n"); 1514 return 0; 1515 } 1516 break; 1517 case Opt_addr: 1518 string = match_strdup(args); 1519 if (string == NULL) 1520 goto out_nomem; 1521 mnt->nfs_server.addrlen = 1522 rpc_pton(mnt->net, string, strlen(string), 1523 (struct sockaddr *) 1524 &mnt->nfs_server.address, 1525 sizeof(mnt->nfs_server.address)); 1526 kfree(string); 1527 if (mnt->nfs_server.addrlen == 0) 1528 goto out_invalid_address; 1529 break; 1530 case Opt_clientaddr: 1531 if (nfs_get_option_str(args, &mnt->client_address)) 1532 goto out_nomem; 1533 break; 1534 case Opt_mounthost: 1535 if (nfs_get_option_str(args, 1536 &mnt->mount_server.hostname)) 1537 goto out_nomem; 1538 break; 1539 case Opt_mountaddr: 1540 string = match_strdup(args); 1541 if (string == NULL) 1542 goto out_nomem; 1543 mnt->mount_server.addrlen = 1544 rpc_pton(mnt->net, string, strlen(string), 1545 (struct sockaddr *) 1546 &mnt->mount_server.address, 1547 sizeof(mnt->mount_server.address)); 1548 kfree(string); 1549 if (mnt->mount_server.addrlen == 0) 1550 goto out_invalid_address; 1551 break; 1552 case Opt_lookupcache: 1553 string = match_strdup(args); 1554 if (string == NULL) 1555 goto out_nomem; 1556 token = match_token(string, 1557 nfs_lookupcache_tokens, args); 1558 kfree(string); 1559 switch (token) { 1560 case Opt_lookupcache_all: 1561 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1562 break; 1563 case Opt_lookupcache_positive: 1564 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1565 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1566 break; 1567 case Opt_lookupcache_none: 1568 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1569 break; 1570 default: 1571 dfprintk(MOUNT, "NFS: invalid " 1572 "lookupcache argument\n"); 1573 return 0; 1574 }; 1575 break; 1576 case Opt_fscache_uniq: 1577 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1578 goto out_nomem; 1579 mnt->options |= NFS_OPTION_FSCACHE; 1580 break; 1581 case Opt_local_lock: 1582 string = match_strdup(args); 1583 if (string == NULL) 1584 goto out_nomem; 1585 token = match_token(string, nfs_local_lock_tokens, 1586 args); 1587 kfree(string); 1588 switch (token) { 1589 case Opt_local_lock_all: 1590 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1591 NFS_MOUNT_LOCAL_FCNTL); 1592 break; 1593 case Opt_local_lock_flock: 1594 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1595 break; 1596 case Opt_local_lock_posix: 1597 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1598 break; 1599 case Opt_local_lock_none: 1600 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1601 NFS_MOUNT_LOCAL_FCNTL); 1602 break; 1603 default: 1604 dfprintk(MOUNT, "NFS: invalid " 1605 "local_lock argument\n"); 1606 return 0; 1607 }; 1608 break; 1609 1610 /* 1611 * Special options 1612 */ 1613 case Opt_sloppy: 1614 sloppy = 1; 1615 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1616 break; 1617 case Opt_userspace: 1618 case Opt_deprecated: 1619 dfprintk(MOUNT, "NFS: ignoring mount option " 1620 "'%s'\n", p); 1621 break; 1622 1623 default: 1624 invalid_option = 1; 1625 dfprintk(MOUNT, "NFS: unrecognized mount option " 1626 "'%s'\n", p); 1627 } 1628 } 1629 1630 if (!sloppy && invalid_option) 1631 return 0; 1632 1633 if (mnt->minorversion && mnt->version != 4) 1634 goto out_minorversion_mismatch; 1635 1636 if (mnt->options & NFS_OPTION_MIGRATION && 1637 (mnt->version != 4 || mnt->minorversion != 0)) 1638 goto out_migration_misuse; 1639 1640 /* 1641 * verify that any proto=/mountproto= options match the address 1642 * families in the addr=/mountaddr= options. 1643 */ 1644 if (protofamily != AF_UNSPEC && 1645 protofamily != mnt->nfs_server.address.ss_family) 1646 goto out_proto_mismatch; 1647 1648 if (mountfamily != AF_UNSPEC) { 1649 if (mnt->mount_server.addrlen) { 1650 if (mountfamily != mnt->mount_server.address.ss_family) 1651 goto out_mountproto_mismatch; 1652 } else { 1653 if (mountfamily != mnt->nfs_server.address.ss_family) 1654 goto out_mountproto_mismatch; 1655 } 1656 } 1657 1658 return 1; 1659 1660 out_mountproto_mismatch: 1661 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1662 "option\n"); 1663 return 0; 1664 out_proto_mismatch: 1665 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1666 return 0; 1667 out_invalid_address: 1668 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1669 return 0; 1670 out_invalid_value: 1671 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1672 return 0; 1673 out_minorversion_mismatch: 1674 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1675 "minorversion=%u\n", mnt->version, mnt->minorversion); 1676 return 0; 1677 out_migration_misuse: 1678 printk(KERN_INFO 1679 "NFS: 'migration' not supported for this NFS version\n"); 1680 return 0; 1681 out_nomem: 1682 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1683 return 0; 1684 out_security_failure: 1685 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1686 return 0; 1687 } 1688 1689 /* 1690 * Ensure that a specified authtype in args->auth_info is supported by 1691 * the server. Returns 0 and sets args->selected_flavor if it's ok, and 1692 * -EACCES if not. 1693 */ 1694 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args, 1695 rpc_authflavor_t *server_authlist, unsigned int count) 1696 { 1697 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 1698 bool found_auth_null = false; 1699 unsigned int i; 1700 1701 /* 1702 * If the sec= mount option is used, the specified flavor or AUTH_NULL 1703 * must be in the list returned by the server. 1704 * 1705 * AUTH_NULL has a special meaning when it's in the server list - it 1706 * means that the server will ignore the rpc creds, so any flavor 1707 * can be used but still use the sec= that was specified. 1708 * 1709 * Note also that the MNT procedure in MNTv1 does not return a list 1710 * of supported security flavors. In this case, nfs_mount() fabricates 1711 * a security flavor list containing just AUTH_NULL. 1712 */ 1713 for (i = 0; i < count; i++) { 1714 flavor = server_authlist[i]; 1715 1716 if (nfs_auth_info_match(&args->auth_info, flavor)) 1717 goto out; 1718 1719 if (flavor == RPC_AUTH_NULL) 1720 found_auth_null = true; 1721 } 1722 1723 if (found_auth_null) { 1724 flavor = args->auth_info.flavors[0]; 1725 goto out; 1726 } 1727 1728 dfprintk(MOUNT, 1729 "NFS: specified auth flavors not supported by server\n"); 1730 return -EACCES; 1731 1732 out: 1733 args->selected_flavor = flavor; 1734 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor); 1735 return 0; 1736 } 1737 1738 /* 1739 * Use the remote server's MOUNT service to request the NFS file handle 1740 * corresponding to the provided path. 1741 */ 1742 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1743 struct nfs_fh *root_fh, 1744 rpc_authflavor_t *server_authlist, 1745 unsigned int *server_authlist_len) 1746 { 1747 struct nfs_mount_request request = { 1748 .sap = (struct sockaddr *) 1749 &args->mount_server.address, 1750 .dirpath = args->nfs_server.export_path, 1751 .protocol = args->mount_server.protocol, 1752 .fh = root_fh, 1753 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1754 .auth_flav_len = server_authlist_len, 1755 .auth_flavs = server_authlist, 1756 .net = args->net, 1757 }; 1758 int status; 1759 1760 if (args->mount_server.version == 0) { 1761 switch (args->version) { 1762 default: 1763 args->mount_server.version = NFS_MNT3_VERSION; 1764 break; 1765 case 2: 1766 args->mount_server.version = NFS_MNT_VERSION; 1767 } 1768 } 1769 request.version = args->mount_server.version; 1770 1771 if (args->mount_server.hostname) 1772 request.hostname = args->mount_server.hostname; 1773 else 1774 request.hostname = args->nfs_server.hostname; 1775 1776 /* 1777 * Construct the mount server's address. 1778 */ 1779 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1780 memcpy(request.sap, &args->nfs_server.address, 1781 args->nfs_server.addrlen); 1782 args->mount_server.addrlen = args->nfs_server.addrlen; 1783 } 1784 request.salen = args->mount_server.addrlen; 1785 nfs_set_port(request.sap, &args->mount_server.port, 0); 1786 1787 /* 1788 * Now ask the mount server to map our export path 1789 * to a file handle. 1790 */ 1791 status = nfs_mount(&request); 1792 if (status != 0) { 1793 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1794 request.hostname, status); 1795 return status; 1796 } 1797 1798 return 0; 1799 } 1800 1801 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, 1802 struct nfs_subversion *nfs_mod) 1803 { 1804 int status; 1805 unsigned int i; 1806 bool tried_auth_unix = false; 1807 bool auth_null_in_list = false; 1808 struct nfs_server *server = ERR_PTR(-EACCES); 1809 struct nfs_parsed_mount_data *args = mount_info->parsed; 1810 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 1811 unsigned int authlist_len = ARRAY_SIZE(authlist); 1812 1813 status = nfs_request_mount(args, mount_info->mntfh, authlist, 1814 &authlist_len); 1815 if (status) 1816 return ERR_PTR(status); 1817 1818 /* 1819 * Was a sec= authflavor specified in the options? First, verify 1820 * whether the server supports it, and then just try to use it if so. 1821 */ 1822 if (args->auth_info.flavor_len > 0) { 1823 status = nfs_verify_authflavors(args, authlist, authlist_len); 1824 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 1825 args->selected_flavor); 1826 if (status) 1827 return ERR_PTR(status); 1828 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1829 } 1830 1831 /* 1832 * No sec= option was provided. RFC 2623, section 2.7 suggests we 1833 * SHOULD prefer the flavor listed first. However, some servers list 1834 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 1835 */ 1836 for (i = 0; i < authlist_len; ++i) { 1837 rpc_authflavor_t flavor; 1838 struct rpcsec_gss_info info; 1839 1840 flavor = authlist[i]; 1841 switch (flavor) { 1842 case RPC_AUTH_UNIX: 1843 tried_auth_unix = true; 1844 break; 1845 case RPC_AUTH_NULL: 1846 auth_null_in_list = true; 1847 continue; 1848 default: 1849 if (rpcauth_get_gssinfo(flavor, &info) != 0) 1850 continue; 1851 /* Fallthrough */ 1852 } 1853 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 1854 args->selected_flavor = flavor; 1855 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1856 if (!IS_ERR(server)) 1857 return server; 1858 } 1859 1860 /* 1861 * Nothing we tried so far worked. At this point, give up if we've 1862 * already tried AUTH_UNIX or if the server's list doesn't contain 1863 * AUTH_NULL 1864 */ 1865 if (tried_auth_unix || !auth_null_in_list) 1866 return server; 1867 1868 /* Last chance! Try AUTH_UNIX */ 1869 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 1870 args->selected_flavor = RPC_AUTH_UNIX; 1871 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1872 } 1873 1874 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1875 struct nfs_mount_info *mount_info, 1876 struct nfs_subversion *nfs_mod) 1877 { 1878 struct nfs_server *server; 1879 1880 if (mount_info->parsed->need_mount) 1881 server = nfs_try_mount_request(mount_info, nfs_mod); 1882 else 1883 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1884 1885 if (IS_ERR(server)) 1886 return ERR_CAST(server); 1887 1888 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1889 } 1890 EXPORT_SYMBOL_GPL(nfs_try_mount); 1891 1892 /* 1893 * Split "dev_name" into "hostname:export_path". 1894 * 1895 * The leftmost colon demarks the split between the server's hostname 1896 * and the export path. If the hostname starts with a left square 1897 * bracket, then it may contain colons. 1898 * 1899 * Note: caller frees hostname and export path, even on error. 1900 */ 1901 static int nfs_parse_devname(const char *dev_name, 1902 char **hostname, size_t maxnamlen, 1903 char **export_path, size_t maxpathlen) 1904 { 1905 size_t len; 1906 char *end; 1907 1908 if (unlikely(!dev_name || !*dev_name)) { 1909 dfprintk(MOUNT, "NFS: device name not specified\n"); 1910 return -EINVAL; 1911 } 1912 1913 /* Is the host name protected with square brakcets? */ 1914 if (*dev_name == '[') { 1915 end = strchr(++dev_name, ']'); 1916 if (end == NULL || end[1] != ':') 1917 goto out_bad_devname; 1918 1919 len = end - dev_name; 1920 end++; 1921 } else { 1922 char *comma; 1923 1924 end = strchr(dev_name, ':'); 1925 if (end == NULL) 1926 goto out_bad_devname; 1927 len = end - dev_name; 1928 1929 /* kill possible hostname list: not supported */ 1930 comma = strchr(dev_name, ','); 1931 if (comma != NULL && comma < end) 1932 len = comma - dev_name; 1933 } 1934 1935 if (len > maxnamlen) 1936 goto out_hostname; 1937 1938 /* N.B. caller will free nfs_server.hostname in all cases */ 1939 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1940 if (*hostname == NULL) 1941 goto out_nomem; 1942 len = strlen(++end); 1943 if (len > maxpathlen) 1944 goto out_path; 1945 *export_path = kstrndup(end, len, GFP_KERNEL); 1946 if (!*export_path) 1947 goto out_nomem; 1948 1949 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1950 return 0; 1951 1952 out_bad_devname: 1953 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1954 return -EINVAL; 1955 1956 out_nomem: 1957 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1958 return -ENOMEM; 1959 1960 out_hostname: 1961 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1962 return -ENAMETOOLONG; 1963 1964 out_path: 1965 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1966 return -ENAMETOOLONG; 1967 } 1968 1969 /* 1970 * Validate the NFS2/NFS3 mount data 1971 * - fills in the mount root filehandle 1972 * 1973 * For option strings, user space handles the following behaviors: 1974 * 1975 * + DNS: mapping server host name to IP address ("addr=" option) 1976 * 1977 * + failure mode: how to behave if a mount request can't be handled 1978 * immediately ("fg/bg" option) 1979 * 1980 * + retry: how often to retry a mount request ("retry=" option) 1981 * 1982 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1983 * mountproto=tcp after mountproto=udp, and so on 1984 */ 1985 static int nfs23_validate_mount_data(void *options, 1986 struct nfs_parsed_mount_data *args, 1987 struct nfs_fh *mntfh, 1988 const char *dev_name) 1989 { 1990 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1991 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1992 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; 1993 1994 if (data == NULL) 1995 goto out_no_data; 1996 1997 args->version = NFS_DEFAULT_VERSION; 1998 switch (data->version) { 1999 case 1: 2000 data->namlen = 0; /* fall through */ 2001 case 2: 2002 data->bsize = 0; /* fall through */ 2003 case 3: 2004 if (data->flags & NFS_MOUNT_VER3) 2005 goto out_no_v3; 2006 data->root.size = NFS2_FHSIZE; 2007 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 2008 /* Turn off security negotiation */ 2009 extra_flags |= NFS_MOUNT_SECFLAVOUR; 2010 /* fall through */ 2011 case 4: 2012 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2013 goto out_no_sec; 2014 /* fall through */ 2015 case 5: 2016 memset(data->context, 0, sizeof(data->context)); 2017 /* fall through */ 2018 case 6: 2019 if (data->flags & NFS_MOUNT_VER3) { 2020 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 2021 goto out_invalid_fh; 2022 mntfh->size = data->root.size; 2023 args->version = 3; 2024 } else { 2025 mntfh->size = NFS2_FHSIZE; 2026 args->version = 2; 2027 } 2028 2029 2030 memcpy(mntfh->data, data->root.data, mntfh->size); 2031 if (mntfh->size < sizeof(mntfh->data)) 2032 memset(mntfh->data + mntfh->size, 0, 2033 sizeof(mntfh->data) - mntfh->size); 2034 2035 /* 2036 * Translate to nfs_parsed_mount_data, which nfs_fill_super 2037 * can deal with. 2038 */ 2039 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 2040 args->flags |= extra_flags; 2041 args->rsize = data->rsize; 2042 args->wsize = data->wsize; 2043 args->timeo = data->timeo; 2044 args->retrans = data->retrans; 2045 args->acregmin = data->acregmin; 2046 args->acregmax = data->acregmax; 2047 args->acdirmin = data->acdirmin; 2048 args->acdirmax = data->acdirmax; 2049 args->need_mount = false; 2050 2051 memcpy(sap, &data->addr, sizeof(data->addr)); 2052 args->nfs_server.addrlen = sizeof(data->addr); 2053 args->nfs_server.port = ntohs(data->addr.sin_port); 2054 if (sap->sa_family != AF_INET || 2055 !nfs_verify_server_address(sap)) 2056 goto out_no_address; 2057 2058 if (!(data->flags & NFS_MOUNT_TCP)) 2059 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 2060 /* N.B. caller will free nfs_server.hostname in all cases */ 2061 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 2062 args->namlen = data->namlen; 2063 args->bsize = data->bsize; 2064 2065 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2066 args->selected_flavor = data->pseudoflavor; 2067 else 2068 args->selected_flavor = RPC_AUTH_UNIX; 2069 if (!args->nfs_server.hostname) 2070 goto out_nomem; 2071 2072 if (!(data->flags & NFS_MOUNT_NONLM)) 2073 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 2074 NFS_MOUNT_LOCAL_FCNTL); 2075 else 2076 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 2077 NFS_MOUNT_LOCAL_FCNTL); 2078 /* 2079 * The legacy version 6 binary mount data from userspace has a 2080 * field used only to transport selinux information into the 2081 * the kernel. To continue to support that functionality we 2082 * have a touch of selinux knowledge here in the NFS code. The 2083 * userspace code converted context=blah to just blah so we are 2084 * converting back to the full string selinux understands. 2085 */ 2086 if (data->context[0]){ 2087 #ifdef CONFIG_SECURITY_SELINUX 2088 int rc; 2089 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 2090 rc = security_add_mnt_opt("context", data->context, 2091 strlen(data->context), &args->lsm_opts); 2092 if (rc) 2093 return rc; 2094 #else 2095 return -EINVAL; 2096 #endif 2097 } 2098 2099 break; 2100 default: 2101 return NFS_TEXT_DATA; 2102 } 2103 2104 return 0; 2105 2106 out_no_data: 2107 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2108 return -EINVAL; 2109 2110 out_no_v3: 2111 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2112 data->version); 2113 return -EINVAL; 2114 2115 out_no_sec: 2116 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2117 return -EINVAL; 2118 2119 out_nomem: 2120 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2121 return -ENOMEM; 2122 2123 out_no_address: 2124 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2125 return -EINVAL; 2126 2127 out_invalid_fh: 2128 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2129 return -EINVAL; 2130 } 2131 2132 #if IS_ENABLED(CONFIG_NFS_V4) 2133 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2134 void *options, 2135 struct nfs_parsed_mount_data *args, 2136 struct nfs_fh *mntfh, 2137 const char *dev_name) 2138 { 2139 if (fs_type == &nfs_fs_type) 2140 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2141 return nfs4_validate_mount_data(options, args, dev_name); 2142 } 2143 #else 2144 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2145 void *options, 2146 struct nfs_parsed_mount_data *args, 2147 struct nfs_fh *mntfh, 2148 const char *dev_name) 2149 { 2150 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2151 } 2152 #endif 2153 2154 static int nfs_validate_text_mount_data(void *options, 2155 struct nfs_parsed_mount_data *args, 2156 const char *dev_name) 2157 { 2158 int port = 0; 2159 int max_namelen = PAGE_SIZE; 2160 int max_pathlen = NFS_MAXPATHLEN; 2161 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2162 2163 if (nfs_parse_mount_options((char *)options, args) == 0) 2164 return -EINVAL; 2165 2166 if (!nfs_verify_server_address(sap)) 2167 goto out_no_address; 2168 2169 if (args->version == 4) { 2170 #if IS_ENABLED(CONFIG_NFS_V4) 2171 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA) 2172 port = NFS_RDMA_PORT; 2173 else 2174 port = NFS_PORT; 2175 max_namelen = NFS4_MAXNAMLEN; 2176 max_pathlen = NFS4_MAXPATHLEN; 2177 nfs_validate_transport_protocol(args); 2178 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2179 goto out_invalid_transport_udp; 2180 nfs4_validate_mount_flags(args); 2181 #else 2182 goto out_v4_not_compiled; 2183 #endif /* CONFIG_NFS_V4 */ 2184 } else { 2185 nfs_set_mount_transport_protocol(args); 2186 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA) 2187 port = NFS_RDMA_PORT; 2188 } 2189 2190 nfs_set_port(sap, &args->nfs_server.port, port); 2191 2192 return nfs_parse_devname(dev_name, 2193 &args->nfs_server.hostname, 2194 max_namelen, 2195 &args->nfs_server.export_path, 2196 max_pathlen); 2197 2198 #if !IS_ENABLED(CONFIG_NFS_V4) 2199 out_v4_not_compiled: 2200 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2201 return -EPROTONOSUPPORT; 2202 #else 2203 out_invalid_transport_udp: 2204 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2205 return -EINVAL; 2206 #endif /* !CONFIG_NFS_V4 */ 2207 2208 out_no_address: 2209 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2210 return -EINVAL; 2211 } 2212 2213 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 2214 | NFS_MOUNT_SECURE \ 2215 | NFS_MOUNT_TCP \ 2216 | NFS_MOUNT_VER3 \ 2217 | NFS_MOUNT_KERBEROS \ 2218 | NFS_MOUNT_NONLM \ 2219 | NFS_MOUNT_BROKEN_SUID \ 2220 | NFS_MOUNT_STRICTLOCK \ 2221 | NFS_MOUNT_LEGACY_INTERFACE) 2222 2223 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 2224 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 2225 2226 static int 2227 nfs_compare_remount_data(struct nfs_server *nfss, 2228 struct nfs_parsed_mount_data *data) 2229 { 2230 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 2231 data->rsize != nfss->rsize || 2232 data->wsize != nfss->wsize || 2233 data->version != nfss->nfs_client->rpc_ops->version || 2234 data->minorversion != nfss->nfs_client->cl_minorversion || 2235 data->retrans != nfss->client->cl_timeout->to_retries || 2236 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) || 2237 data->acregmin != nfss->acregmin / HZ || 2238 data->acregmax != nfss->acregmax / HZ || 2239 data->acdirmin != nfss->acdirmin / HZ || 2240 data->acdirmax != nfss->acdirmax / HZ || 2241 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2242 data->nfs_server.port != nfss->port || 2243 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2244 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2245 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2246 return -EINVAL; 2247 2248 return 0; 2249 } 2250 2251 int 2252 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2253 { 2254 int error; 2255 struct nfs_server *nfss = sb->s_fs_info; 2256 struct nfs_parsed_mount_data *data; 2257 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2258 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2259 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2260 2261 sync_filesystem(sb); 2262 2263 /* 2264 * Userspace mount programs that send binary options generally send 2265 * them populated with default values. We have no way to know which 2266 * ones were explicitly specified. Fall back to legacy behavior and 2267 * just return success. 2268 */ 2269 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2270 (nfsvers <= 3 && (!options || (options->version >= 1 && 2271 options->version <= 6)))) 2272 return 0; 2273 2274 data = nfs_alloc_parsed_mount_data(); 2275 if (data == NULL) 2276 return -ENOMEM; 2277 2278 /* fill out struct with values from existing mount */ 2279 data->flags = nfss->flags; 2280 data->rsize = nfss->rsize; 2281 data->wsize = nfss->wsize; 2282 data->retrans = nfss->client->cl_timeout->to_retries; 2283 data->selected_flavor = nfss->client->cl_auth->au_flavor; 2284 data->acregmin = nfss->acregmin / HZ; 2285 data->acregmax = nfss->acregmax / HZ; 2286 data->acdirmin = nfss->acdirmin / HZ; 2287 data->acdirmax = nfss->acdirmax / HZ; 2288 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2289 data->nfs_server.port = nfss->port; 2290 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2291 data->version = nfsvers; 2292 data->minorversion = nfss->nfs_client->cl_minorversion; 2293 data->net = current->nsproxy->net_ns; 2294 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2295 data->nfs_server.addrlen); 2296 2297 /* overwrite those values with any that were specified */ 2298 error = -EINVAL; 2299 if (!nfs_parse_mount_options((char *)options, data)) 2300 goto out; 2301 2302 /* 2303 * noac is a special case. It implies -o sync, but that's not 2304 * necessarily reflected in the mtab options. do_remount_sb 2305 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the 2306 * remount options, so we have to explicitly reset it. 2307 */ 2308 if (data->flags & NFS_MOUNT_NOAC) 2309 *flags |= SB_SYNCHRONOUS; 2310 2311 /* compare new mount options with old ones */ 2312 error = nfs_compare_remount_data(nfss, data); 2313 if (!error) 2314 error = security_sb_remount(sb, data->lsm_opts); 2315 out: 2316 nfs_free_parsed_mount_data(data); 2317 return error; 2318 } 2319 EXPORT_SYMBOL_GPL(nfs_remount); 2320 2321 /* 2322 * Initialise the common bits of the superblock 2323 */ 2324 static void nfs_initialise_sb(struct super_block *sb) 2325 { 2326 struct nfs_server *server = NFS_SB(sb); 2327 2328 sb->s_magic = NFS_SUPER_MAGIC; 2329 2330 /* We probably want something more informative here */ 2331 snprintf(sb->s_id, sizeof(sb->s_id), 2332 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2333 2334 if (sb->s_blocksize == 0) 2335 sb->s_blocksize = nfs_block_bits(server->wsize, 2336 &sb->s_blocksize_bits); 2337 2338 nfs_super_set_maxbytes(sb, server->maxfilesize); 2339 } 2340 2341 /* 2342 * Finish setting up an NFS2/3 superblock 2343 */ 2344 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2345 { 2346 struct nfs_parsed_mount_data *data = mount_info->parsed; 2347 struct nfs_server *server = NFS_SB(sb); 2348 2349 sb->s_blocksize_bits = 0; 2350 sb->s_blocksize = 0; 2351 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2352 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2353 if (data && data->bsize) 2354 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2355 2356 if (server->nfs_client->rpc_ops->version != 2) { 2357 /* The VFS shouldn't apply the umask to mode bits. We will do 2358 * so ourselves when necessary. 2359 */ 2360 sb->s_flags |= SB_POSIXACL; 2361 sb->s_time_gran = 1; 2362 sb->s_export_op = &nfs_export_ops; 2363 } 2364 2365 nfs_initialise_sb(sb); 2366 } 2367 EXPORT_SYMBOL_GPL(nfs_fill_super); 2368 2369 /* 2370 * Finish setting up a cloned NFS2/3/4 superblock 2371 */ 2372 static void nfs_clone_super(struct super_block *sb, 2373 struct nfs_mount_info *mount_info) 2374 { 2375 const struct super_block *old_sb = mount_info->cloned->sb; 2376 struct nfs_server *server = NFS_SB(sb); 2377 2378 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2379 sb->s_blocksize = old_sb->s_blocksize; 2380 sb->s_maxbytes = old_sb->s_maxbytes; 2381 sb->s_xattr = old_sb->s_xattr; 2382 sb->s_op = old_sb->s_op; 2383 sb->s_time_gran = 1; 2384 sb->s_export_op = old_sb->s_export_op; 2385 2386 if (server->nfs_client->rpc_ops->version != 2) { 2387 /* The VFS shouldn't apply the umask to mode bits. We will do 2388 * so ourselves when necessary. 2389 */ 2390 sb->s_flags |= SB_POSIXACL; 2391 } 2392 2393 nfs_initialise_sb(sb); 2394 } 2395 2396 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2397 { 2398 const struct nfs_server *a = s->s_fs_info; 2399 const struct rpc_clnt *clnt_a = a->client; 2400 const struct rpc_clnt *clnt_b = b->client; 2401 2402 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2403 goto Ebusy; 2404 if (a->nfs_client != b->nfs_client) 2405 goto Ebusy; 2406 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 2407 goto Ebusy; 2408 if (a->wsize != b->wsize) 2409 goto Ebusy; 2410 if (a->rsize != b->rsize) 2411 goto Ebusy; 2412 if (a->acregmin != b->acregmin) 2413 goto Ebusy; 2414 if (a->acregmax != b->acregmax) 2415 goto Ebusy; 2416 if (a->acdirmin != b->acdirmin) 2417 goto Ebusy; 2418 if (a->acdirmax != b->acdirmax) 2419 goto Ebusy; 2420 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2421 goto Ebusy; 2422 return 1; 2423 Ebusy: 2424 return 0; 2425 } 2426 2427 struct nfs_sb_mountdata { 2428 struct nfs_server *server; 2429 int mntflags; 2430 }; 2431 2432 static int nfs_set_super(struct super_block *s, void *data) 2433 { 2434 struct nfs_sb_mountdata *sb_mntdata = data; 2435 struct nfs_server *server = sb_mntdata->server; 2436 int ret; 2437 2438 s->s_flags = sb_mntdata->mntflags; 2439 s->s_fs_info = server; 2440 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2441 ret = set_anon_super(s, server); 2442 if (ret == 0) 2443 server->s_dev = s->s_dev; 2444 return ret; 2445 } 2446 2447 static int nfs_compare_super_address(struct nfs_server *server1, 2448 struct nfs_server *server2) 2449 { 2450 struct sockaddr *sap1, *sap2; 2451 struct rpc_xprt *xprt1 = server1->client->cl_xprt; 2452 struct rpc_xprt *xprt2 = server2->client->cl_xprt; 2453 2454 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) 2455 return 0; 2456 2457 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2458 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2459 2460 if (sap1->sa_family != sap2->sa_family) 2461 return 0; 2462 2463 switch (sap1->sa_family) { 2464 case AF_INET: { 2465 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2466 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2467 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2468 return 0; 2469 if (sin1->sin_port != sin2->sin_port) 2470 return 0; 2471 break; 2472 } 2473 case AF_INET6: { 2474 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2475 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2476 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2477 return 0; 2478 if (sin1->sin6_port != sin2->sin6_port) 2479 return 0; 2480 break; 2481 } 2482 default: 2483 return 0; 2484 } 2485 2486 return 1; 2487 } 2488 2489 static int nfs_compare_userns(const struct nfs_server *old, 2490 const struct nfs_server *new) 2491 { 2492 const struct user_namespace *oldns = &init_user_ns; 2493 const struct user_namespace *newns = &init_user_ns; 2494 2495 if (old->client && old->client->cl_cred) 2496 oldns = old->client->cl_cred->user_ns; 2497 if (new->client && new->client->cl_cred) 2498 newns = new->client->cl_cred->user_ns; 2499 if (oldns != newns) 2500 return 0; 2501 return 1; 2502 } 2503 2504 static int nfs_compare_super(struct super_block *sb, void *data) 2505 { 2506 struct nfs_sb_mountdata *sb_mntdata = data; 2507 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2508 int mntflags = sb_mntdata->mntflags; 2509 2510 if (!nfs_compare_super_address(old, server)) 2511 return 0; 2512 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2513 if (old->flags & NFS_MOUNT_UNSHARED) 2514 return 0; 2515 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2516 return 0; 2517 if (!nfs_compare_userns(old, server)) 2518 return 0; 2519 return nfs_compare_mount_options(sb, server, mntflags); 2520 } 2521 2522 #ifdef CONFIG_NFS_FSCACHE 2523 static void nfs_get_cache_cookie(struct super_block *sb, 2524 struct nfs_parsed_mount_data *parsed, 2525 struct nfs_clone_mount *cloned) 2526 { 2527 struct nfs_server *nfss = NFS_SB(sb); 2528 char *uniq = NULL; 2529 int ulen = 0; 2530 2531 nfss->fscache_key = NULL; 2532 nfss->fscache = NULL; 2533 2534 if (parsed) { 2535 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2536 return; 2537 if (parsed->fscache_uniq) { 2538 uniq = parsed->fscache_uniq; 2539 ulen = strlen(parsed->fscache_uniq); 2540 } 2541 } else if (cloned) { 2542 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2543 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2544 return; 2545 if (mnt_s->fscache_key) { 2546 uniq = mnt_s->fscache_key->key.uniquifier; 2547 ulen = mnt_s->fscache_key->key.uniq_len; 2548 }; 2549 } else 2550 return; 2551 2552 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2553 } 2554 #else 2555 static void nfs_get_cache_cookie(struct super_block *sb, 2556 struct nfs_parsed_mount_data *parsed, 2557 struct nfs_clone_mount *cloned) 2558 { 2559 } 2560 #endif 2561 2562 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2563 struct nfs_mount_info *mount_info) 2564 { 2565 int error; 2566 unsigned long kflags = 0, kflags_out = 0; 2567 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2568 kflags |= SECURITY_LSM_NATIVE_LABELS; 2569 2570 error = security_sb_set_mnt_opts(s, mount_info->parsed->lsm_opts, 2571 kflags, &kflags_out); 2572 if (error) 2573 goto err; 2574 2575 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2576 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2577 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2578 err: 2579 return error; 2580 } 2581 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2582 2583 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2584 struct nfs_mount_info *mount_info) 2585 { 2586 int error; 2587 unsigned long kflags = 0, kflags_out = 0; 2588 2589 /* clone any lsm security options from the parent to the new sb */ 2590 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2591 return -ESTALE; 2592 2593 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2594 kflags |= SECURITY_LSM_NATIVE_LABELS; 2595 2596 error = security_sb_clone_mnt_opts(mount_info->cloned->sb, s, kflags, 2597 &kflags_out); 2598 if (error) 2599 return error; 2600 2601 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2602 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2603 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2604 return 0; 2605 } 2606 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2607 2608 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2609 int flags, const char *dev_name, 2610 struct nfs_mount_info *mount_info, 2611 struct nfs_subversion *nfs_mod) 2612 { 2613 struct super_block *s; 2614 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2615 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2616 struct nfs_sb_mountdata sb_mntdata = { 2617 .mntflags = flags, 2618 .server = server, 2619 }; 2620 int error; 2621 2622 if (server->flags & NFS_MOUNT_UNSHARED) 2623 compare_super = NULL; 2624 2625 /* -o noac implies -o sync */ 2626 if (server->flags & NFS_MOUNT_NOAC) 2627 sb_mntdata.mntflags |= SB_SYNCHRONOUS; 2628 2629 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) 2630 if (mount_info->cloned->sb->s_flags & SB_SYNCHRONOUS) 2631 sb_mntdata.mntflags |= SB_SYNCHRONOUS; 2632 2633 /* Get a superblock - note that we may end up sharing one that already exists */ 2634 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2635 if (IS_ERR(s)) { 2636 mntroot = ERR_CAST(s); 2637 goto out_err_nosb; 2638 } 2639 2640 if (s->s_fs_info != server) { 2641 nfs_free_server(server); 2642 server = NULL; 2643 } else { 2644 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev), 2645 MINOR(server->s_dev)); 2646 if (error) { 2647 mntroot = ERR_PTR(error); 2648 goto error_splat_super; 2649 } 2650 s->s_bdi->ra_pages = server->rpages * NFS_MAX_READAHEAD; 2651 server->super = s; 2652 } 2653 2654 if (!s->s_root) { 2655 /* initial superblock/root creation */ 2656 mount_info->fill_super(s, mount_info); 2657 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2658 if (!(server->flags & NFS_MOUNT_UNSHARED)) 2659 s->s_iflags |= SB_I_MULTIROOT; 2660 } 2661 2662 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2663 if (IS_ERR(mntroot)) 2664 goto error_splat_super; 2665 2666 error = mount_info->set_security(s, mntroot, mount_info); 2667 if (error) 2668 goto error_splat_root; 2669 2670 s->s_flags |= SB_ACTIVE; 2671 2672 out: 2673 return mntroot; 2674 2675 out_err_nosb: 2676 nfs_free_server(server); 2677 goto out; 2678 2679 error_splat_root: 2680 dput(mntroot); 2681 mntroot = ERR_PTR(error); 2682 error_splat_super: 2683 deactivate_locked_super(s); 2684 goto out; 2685 } 2686 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2687 2688 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2689 int flags, const char *dev_name, void *raw_data) 2690 { 2691 struct nfs_mount_info mount_info = { 2692 .fill_super = nfs_fill_super, 2693 .set_security = nfs_set_sb_security, 2694 }; 2695 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2696 struct nfs_subversion *nfs_mod; 2697 int error; 2698 2699 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2700 mount_info.mntfh = nfs_alloc_fhandle(); 2701 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2702 goto out; 2703 2704 /* Validate the mount data */ 2705 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2706 if (error == NFS_TEXT_DATA) 2707 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2708 if (error < 0) { 2709 mntroot = ERR_PTR(error); 2710 goto out; 2711 } 2712 2713 nfs_mod = get_nfs_version(mount_info.parsed->version); 2714 if (IS_ERR(nfs_mod)) { 2715 mntroot = ERR_CAST(nfs_mod); 2716 goto out; 2717 } 2718 2719 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2720 2721 put_nfs_version(nfs_mod); 2722 out: 2723 nfs_free_parsed_mount_data(mount_info.parsed); 2724 nfs_free_fhandle(mount_info.mntfh); 2725 return mntroot; 2726 } 2727 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2728 2729 /* 2730 * Destroy an NFS2/3 superblock 2731 */ 2732 void nfs_kill_super(struct super_block *s) 2733 { 2734 struct nfs_server *server = NFS_SB(s); 2735 dev_t dev = s->s_dev; 2736 2737 generic_shutdown_super(s); 2738 2739 nfs_fscache_release_super_cookie(s); 2740 2741 nfs_free_server(server); 2742 free_anon_bdev(dev); 2743 } 2744 EXPORT_SYMBOL_GPL(nfs_kill_super); 2745 2746 /* 2747 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2748 */ 2749 static struct dentry * 2750 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2751 const char *dev_name, void *raw_data) 2752 { 2753 struct nfs_clone_mount *data = raw_data; 2754 struct nfs_mount_info mount_info = { 2755 .fill_super = nfs_clone_super, 2756 .set_security = nfs_clone_sb_security, 2757 .cloned = data, 2758 }; 2759 struct nfs_server *server; 2760 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2761 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2762 2763 dprintk("--> nfs_xdev_mount()\n"); 2764 2765 mount_info.mntfh = mount_info.cloned->fh; 2766 2767 /* create a new volume representation */ 2768 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2769 2770 if (IS_ERR(server)) 2771 mntroot = ERR_CAST(server); 2772 else 2773 mntroot = nfs_fs_mount_common(server, flags, 2774 dev_name, &mount_info, nfs_mod); 2775 2776 dprintk("<-- nfs_xdev_mount() = %ld\n", 2777 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2778 return mntroot; 2779 } 2780 2781 #if IS_ENABLED(CONFIG_NFS_V4) 2782 2783 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2784 { 2785 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2786 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2787 } 2788 2789 /* 2790 * Validate NFSv4 mount options 2791 */ 2792 static int nfs4_validate_mount_data(void *options, 2793 struct nfs_parsed_mount_data *args, 2794 const char *dev_name) 2795 { 2796 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2797 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2798 char *c; 2799 2800 if (data == NULL) 2801 goto out_no_data; 2802 2803 args->version = 4; 2804 2805 switch (data->version) { 2806 case 1: 2807 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2808 goto out_no_address; 2809 if (data->host_addrlen == 0) 2810 goto out_no_address; 2811 args->nfs_server.addrlen = data->host_addrlen; 2812 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2813 return -EFAULT; 2814 if (!nfs_verify_server_address(sap)) 2815 goto out_no_address; 2816 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2817 2818 if (data->auth_flavourlen) { 2819 rpc_authflavor_t pseudoflavor; 2820 if (data->auth_flavourlen > 1) 2821 goto out_inval_auth; 2822 if (copy_from_user(&pseudoflavor, 2823 data->auth_flavours, 2824 sizeof(pseudoflavor))) 2825 return -EFAULT; 2826 args->selected_flavor = pseudoflavor; 2827 } else 2828 args->selected_flavor = RPC_AUTH_UNIX; 2829 2830 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2831 if (IS_ERR(c)) 2832 return PTR_ERR(c); 2833 args->nfs_server.hostname = c; 2834 2835 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2836 if (IS_ERR(c)) 2837 return PTR_ERR(c); 2838 args->nfs_server.export_path = c; 2839 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2840 2841 c = strndup_user(data->client_addr.data, 16); 2842 if (IS_ERR(c)) 2843 return PTR_ERR(c); 2844 args->client_address = c; 2845 2846 /* 2847 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2848 * can deal with. 2849 */ 2850 2851 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2852 args->rsize = data->rsize; 2853 args->wsize = data->wsize; 2854 args->timeo = data->timeo; 2855 args->retrans = data->retrans; 2856 args->acregmin = data->acregmin; 2857 args->acregmax = data->acregmax; 2858 args->acdirmin = data->acdirmin; 2859 args->acdirmax = data->acdirmax; 2860 args->nfs_server.protocol = data->proto; 2861 nfs_validate_transport_protocol(args); 2862 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2863 goto out_invalid_transport_udp; 2864 2865 break; 2866 default: 2867 return NFS_TEXT_DATA; 2868 } 2869 2870 return 0; 2871 2872 out_no_data: 2873 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2874 return -EINVAL; 2875 2876 out_inval_auth: 2877 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2878 data->auth_flavourlen); 2879 return -EINVAL; 2880 2881 out_no_address: 2882 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2883 return -EINVAL; 2884 2885 out_invalid_transport_udp: 2886 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2887 return -EINVAL; 2888 } 2889 2890 /* 2891 * NFS v4 module parameters need to stay in the 2892 * NFS client for backwards compatibility 2893 */ 2894 unsigned int nfs_callback_set_tcpport; 2895 unsigned short nfs_callback_nr_threads; 2896 /* Default cache timeout is 10 minutes */ 2897 unsigned int nfs_idmap_cache_timeout = 600; 2898 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2899 bool nfs4_disable_idmapping = true; 2900 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2901 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE; 2902 unsigned short send_implementation_id = 1; 2903 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2904 bool recover_lost_locks = false; 2905 2906 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads); 2907 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2908 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2909 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2910 EXPORT_SYMBOL_GPL(max_session_slots); 2911 EXPORT_SYMBOL_GPL(max_session_cb_slots); 2912 EXPORT_SYMBOL_GPL(send_implementation_id); 2913 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2914 EXPORT_SYMBOL_GPL(recover_lost_locks); 2915 2916 #define NFS_CALLBACK_MAXPORTNR (65535U) 2917 2918 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2919 { 2920 unsigned long num; 2921 int ret; 2922 2923 if (!val) 2924 return -EINVAL; 2925 ret = kstrtoul(val, 0, &num); 2926 if (ret || num > NFS_CALLBACK_MAXPORTNR) 2927 return -EINVAL; 2928 *((unsigned int *)kp->arg) = num; 2929 return 0; 2930 } 2931 static const struct kernel_param_ops param_ops_portnr = { 2932 .set = param_set_portnr, 2933 .get = param_get_uint, 2934 }; 2935 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2936 2937 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2938 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644); 2939 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be " 2940 "assigned to the NFSv4 callback channels."); 2941 module_param(nfs_idmap_cache_timeout, int, 0644); 2942 module_param(nfs4_disable_idmapping, bool, 0644); 2943 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2944 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2945 MODULE_PARM_DESC(nfs4_disable_idmapping, 2946 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2947 module_param(max_session_slots, ushort, 0644); 2948 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2949 "requests the client will negotiate"); 2950 module_param(max_session_cb_slots, ushort, 0644); 2951 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 " 2952 "callbacks the client will process for a given server"); 2953 module_param(send_implementation_id, ushort, 0644); 2954 MODULE_PARM_DESC(send_implementation_id, 2955 "Send implementation ID with NFSv4.1 exchange_id"); 2956 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2957 2958 module_param(recover_lost_locks, bool, 0644); 2959 MODULE_PARM_DESC(recover_lost_locks, 2960 "If the server reports that a lock might be lost, " 2961 "try to recover it risking data corruption."); 2962 2963 2964 #endif /* CONFIG_NFS_V4 */ 2965