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 #define NFS_MAX_CONNECTIONS 16 81 82 enum { 83 /* Mount options that take no arguments */ 84 Opt_soft, Opt_softerr, Opt_hard, 85 Opt_posix, Opt_noposix, 86 Opt_cto, Opt_nocto, 87 Opt_ac, Opt_noac, 88 Opt_lock, Opt_nolock, 89 Opt_udp, Opt_tcp, Opt_rdma, 90 Opt_acl, Opt_noacl, 91 Opt_rdirplus, Opt_nordirplus, 92 Opt_sharecache, Opt_nosharecache, 93 Opt_resvport, Opt_noresvport, 94 Opt_fscache, Opt_nofscache, 95 Opt_migration, Opt_nomigration, 96 97 /* Mount options that take integer arguments */ 98 Opt_port, 99 Opt_rsize, Opt_wsize, Opt_bsize, 100 Opt_timeo, Opt_retrans, 101 Opt_acregmin, Opt_acregmax, 102 Opt_acdirmin, Opt_acdirmax, 103 Opt_actimeo, 104 Opt_namelen, 105 Opt_mountport, 106 Opt_mountvers, 107 Opt_minorversion, 108 109 /* Mount options that take string arguments */ 110 Opt_nfsvers, 111 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 112 Opt_addr, Opt_mountaddr, Opt_clientaddr, 113 Opt_nconnect, 114 Opt_lookupcache, 115 Opt_fscache_uniq, 116 Opt_local_lock, 117 118 /* Special mount options */ 119 Opt_userspace, Opt_deprecated, Opt_sloppy, 120 121 Opt_err 122 }; 123 124 static const match_table_t nfs_mount_option_tokens = { 125 { Opt_userspace, "bg" }, 126 { Opt_userspace, "fg" }, 127 { Opt_userspace, "retry=%s" }, 128 129 { Opt_sloppy, "sloppy" }, 130 131 { Opt_soft, "soft" }, 132 { Opt_softerr, "softerr" }, 133 { Opt_hard, "hard" }, 134 { Opt_deprecated, "intr" }, 135 { Opt_deprecated, "nointr" }, 136 { Opt_posix, "posix" }, 137 { Opt_noposix, "noposix" }, 138 { Opt_cto, "cto" }, 139 { Opt_nocto, "nocto" }, 140 { Opt_ac, "ac" }, 141 { Opt_noac, "noac" }, 142 { Opt_lock, "lock" }, 143 { Opt_nolock, "nolock" }, 144 { Opt_udp, "udp" }, 145 { Opt_tcp, "tcp" }, 146 { Opt_rdma, "rdma" }, 147 { Opt_acl, "acl" }, 148 { Opt_noacl, "noacl" }, 149 { Opt_rdirplus, "rdirplus" }, 150 { Opt_nordirplus, "nordirplus" }, 151 { Opt_sharecache, "sharecache" }, 152 { Opt_nosharecache, "nosharecache" }, 153 { Opt_resvport, "resvport" }, 154 { Opt_noresvport, "noresvport" }, 155 { Opt_fscache, "fsc" }, 156 { Opt_nofscache, "nofsc" }, 157 { Opt_migration, "migration" }, 158 { Opt_nomigration, "nomigration" }, 159 160 { Opt_port, "port=%s" }, 161 { Opt_rsize, "rsize=%s" }, 162 { Opt_wsize, "wsize=%s" }, 163 { Opt_bsize, "bsize=%s" }, 164 { Opt_timeo, "timeo=%s" }, 165 { Opt_retrans, "retrans=%s" }, 166 { Opt_acregmin, "acregmin=%s" }, 167 { Opt_acregmax, "acregmax=%s" }, 168 { Opt_acdirmin, "acdirmin=%s" }, 169 { Opt_acdirmax, "acdirmax=%s" }, 170 { Opt_actimeo, "actimeo=%s" }, 171 { Opt_namelen, "namlen=%s" }, 172 { Opt_mountport, "mountport=%s" }, 173 { Opt_mountvers, "mountvers=%s" }, 174 { Opt_minorversion, "minorversion=%s" }, 175 176 { Opt_nfsvers, "nfsvers=%s" }, 177 { Opt_nfsvers, "vers=%s" }, 178 179 { Opt_sec, "sec=%s" }, 180 { Opt_proto, "proto=%s" }, 181 { Opt_mountproto, "mountproto=%s" }, 182 { Opt_addr, "addr=%s" }, 183 { Opt_clientaddr, "clientaddr=%s" }, 184 { Opt_mounthost, "mounthost=%s" }, 185 { Opt_mountaddr, "mountaddr=%s" }, 186 187 { Opt_nconnect, "nconnect=%s" }, 188 189 { Opt_lookupcache, "lookupcache=%s" }, 190 { Opt_fscache_uniq, "fsc=%s" }, 191 { Opt_local_lock, "local_lock=%s" }, 192 193 /* The following needs to be listed after all other options */ 194 { Opt_nfsvers, "v%s" }, 195 196 { Opt_err, NULL } 197 }; 198 199 enum { 200 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 201 Opt_xprt_rdma6, 202 203 Opt_xprt_err 204 }; 205 206 static const match_table_t nfs_xprt_protocol_tokens = { 207 { Opt_xprt_udp, "udp" }, 208 { Opt_xprt_udp6, "udp6" }, 209 { Opt_xprt_tcp, "tcp" }, 210 { Opt_xprt_tcp6, "tcp6" }, 211 { Opt_xprt_rdma, "rdma" }, 212 { Opt_xprt_rdma6, "rdma6" }, 213 214 { Opt_xprt_err, NULL } 215 }; 216 217 enum { 218 Opt_sec_none, Opt_sec_sys, 219 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 220 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 221 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 222 223 Opt_sec_err 224 }; 225 226 static const match_table_t nfs_secflavor_tokens = { 227 { Opt_sec_none, "none" }, 228 { Opt_sec_none, "null" }, 229 { Opt_sec_sys, "sys" }, 230 231 { Opt_sec_krb5, "krb5" }, 232 { Opt_sec_krb5i, "krb5i" }, 233 { Opt_sec_krb5p, "krb5p" }, 234 235 { Opt_sec_lkey, "lkey" }, 236 { Opt_sec_lkeyi, "lkeyi" }, 237 { Opt_sec_lkeyp, "lkeyp" }, 238 239 { Opt_sec_spkm, "spkm3" }, 240 { Opt_sec_spkmi, "spkm3i" }, 241 { Opt_sec_spkmp, "spkm3p" }, 242 243 { Opt_sec_err, NULL } 244 }; 245 246 enum { 247 Opt_lookupcache_all, Opt_lookupcache_positive, 248 Opt_lookupcache_none, 249 250 Opt_lookupcache_err 251 }; 252 253 static match_table_t nfs_lookupcache_tokens = { 254 { Opt_lookupcache_all, "all" }, 255 { Opt_lookupcache_positive, "pos" }, 256 { Opt_lookupcache_positive, "positive" }, 257 { Opt_lookupcache_none, "none" }, 258 259 { Opt_lookupcache_err, NULL } 260 }; 261 262 enum { 263 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 264 Opt_local_lock_none, 265 266 Opt_local_lock_err 267 }; 268 269 static match_table_t nfs_local_lock_tokens = { 270 { Opt_local_lock_all, "all" }, 271 { Opt_local_lock_flock, "flock" }, 272 { Opt_local_lock_posix, "posix" }, 273 { Opt_local_lock_none, "none" }, 274 275 { Opt_local_lock_err, NULL } 276 }; 277 278 enum { 279 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 280 Opt_vers_4_1, Opt_vers_4_2, 281 282 Opt_vers_err 283 }; 284 285 static match_table_t nfs_vers_tokens = { 286 { Opt_vers_2, "2" }, 287 { Opt_vers_3, "3" }, 288 { Opt_vers_4, "4" }, 289 { Opt_vers_4_0, "4.0" }, 290 { Opt_vers_4_1, "4.1" }, 291 { Opt_vers_4_2, "4.2" }, 292 293 { Opt_vers_err, NULL } 294 }; 295 296 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 297 int flags, const char *dev_name, void *raw_data); 298 299 struct file_system_type nfs_fs_type = { 300 .owner = THIS_MODULE, 301 .name = "nfs", 302 .mount = nfs_fs_mount, 303 .kill_sb = nfs_kill_super, 304 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 305 }; 306 MODULE_ALIAS_FS("nfs"); 307 EXPORT_SYMBOL_GPL(nfs_fs_type); 308 309 struct file_system_type nfs_xdev_fs_type = { 310 .owner = THIS_MODULE, 311 .name = "nfs", 312 .mount = nfs_xdev_mount, 313 .kill_sb = nfs_kill_super, 314 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 315 }; 316 317 const struct super_operations nfs_sops = { 318 .alloc_inode = nfs_alloc_inode, 319 .free_inode = nfs_free_inode, 320 .write_inode = nfs_write_inode, 321 .drop_inode = nfs_drop_inode, 322 .statfs = nfs_statfs, 323 .evict_inode = nfs_evict_inode, 324 .umount_begin = nfs_umount_begin, 325 .show_options = nfs_show_options, 326 .show_devname = nfs_show_devname, 327 .show_path = nfs_show_path, 328 .show_stats = nfs_show_stats, 329 .remount_fs = nfs_remount, 330 }; 331 EXPORT_SYMBOL_GPL(nfs_sops); 332 333 #if IS_ENABLED(CONFIG_NFS_V4) 334 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 335 static int nfs4_validate_mount_data(void *options, 336 struct nfs_parsed_mount_data *args, const char *dev_name); 337 338 struct file_system_type nfs4_fs_type = { 339 .owner = THIS_MODULE, 340 .name = "nfs4", 341 .mount = nfs_fs_mount, 342 .kill_sb = nfs_kill_super, 343 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 344 }; 345 MODULE_ALIAS_FS("nfs4"); 346 MODULE_ALIAS("nfs4"); 347 EXPORT_SYMBOL_GPL(nfs4_fs_type); 348 349 static int __init register_nfs4_fs(void) 350 { 351 return register_filesystem(&nfs4_fs_type); 352 } 353 354 static void unregister_nfs4_fs(void) 355 { 356 unregister_filesystem(&nfs4_fs_type); 357 } 358 #else 359 static int __init register_nfs4_fs(void) 360 { 361 return 0; 362 } 363 364 static void unregister_nfs4_fs(void) 365 { 366 } 367 #endif 368 369 static struct shrinker acl_shrinker = { 370 .count_objects = nfs_access_cache_count, 371 .scan_objects = nfs_access_cache_scan, 372 .seeks = DEFAULT_SEEKS, 373 }; 374 375 /* 376 * Register the NFS filesystems 377 */ 378 int __init register_nfs_fs(void) 379 { 380 int ret; 381 382 ret = register_filesystem(&nfs_fs_type); 383 if (ret < 0) 384 goto error_0; 385 386 ret = register_nfs4_fs(); 387 if (ret < 0) 388 goto error_1; 389 390 ret = nfs_register_sysctl(); 391 if (ret < 0) 392 goto error_2; 393 ret = register_shrinker(&acl_shrinker); 394 if (ret < 0) 395 goto error_3; 396 return 0; 397 error_3: 398 nfs_unregister_sysctl(); 399 error_2: 400 unregister_nfs4_fs(); 401 error_1: 402 unregister_filesystem(&nfs_fs_type); 403 error_0: 404 return ret; 405 } 406 407 /* 408 * Unregister the NFS filesystems 409 */ 410 void __exit unregister_nfs_fs(void) 411 { 412 unregister_shrinker(&acl_shrinker); 413 nfs_unregister_sysctl(); 414 unregister_nfs4_fs(); 415 unregister_filesystem(&nfs_fs_type); 416 } 417 418 bool nfs_sb_active(struct super_block *sb) 419 { 420 struct nfs_server *server = NFS_SB(sb); 421 422 if (!atomic_inc_not_zero(&sb->s_active)) 423 return false; 424 if (atomic_inc_return(&server->active) != 1) 425 atomic_dec(&sb->s_active); 426 return true; 427 } 428 EXPORT_SYMBOL_GPL(nfs_sb_active); 429 430 void nfs_sb_deactive(struct super_block *sb) 431 { 432 struct nfs_server *server = NFS_SB(sb); 433 434 if (atomic_dec_and_test(&server->active)) 435 deactivate_super(sb); 436 } 437 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 438 439 /* 440 * Deliver file system statistics to userspace 441 */ 442 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 443 { 444 struct nfs_server *server = NFS_SB(dentry->d_sb); 445 unsigned char blockbits; 446 unsigned long blockres; 447 struct nfs_fh *fh = NFS_FH(d_inode(dentry)); 448 struct nfs_fsstat res; 449 int error = -ENOMEM; 450 451 res.fattr = nfs_alloc_fattr(); 452 if (res.fattr == NULL) 453 goto out_err; 454 455 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 456 if (unlikely(error == -ESTALE)) { 457 struct dentry *pd_dentry; 458 459 pd_dentry = dget_parent(dentry); 460 nfs_zap_caches(d_inode(pd_dentry)); 461 dput(pd_dentry); 462 } 463 nfs_free_fattr(res.fattr); 464 if (error < 0) 465 goto out_err; 466 467 buf->f_type = NFS_SUPER_MAGIC; 468 469 /* 470 * Current versions of glibc do not correctly handle the 471 * case where f_frsize != f_bsize. Eventually we want to 472 * report the value of wtmult in this field. 473 */ 474 buf->f_frsize = dentry->d_sb->s_blocksize; 475 476 /* 477 * On most *nix systems, f_blocks, f_bfree, and f_bavail 478 * are reported in units of f_frsize. Linux hasn't had 479 * an f_frsize field in its statfs struct until recently, 480 * thus historically Linux's sys_statfs reports these 481 * fields in units of f_bsize. 482 */ 483 buf->f_bsize = dentry->d_sb->s_blocksize; 484 blockbits = dentry->d_sb->s_blocksize_bits; 485 blockres = (1 << blockbits) - 1; 486 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 487 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 488 buf->f_bavail = (res.abytes + blockres) >> blockbits; 489 490 buf->f_files = res.tfiles; 491 buf->f_ffree = res.afiles; 492 493 buf->f_namelen = server->namelen; 494 495 return 0; 496 497 out_err: 498 dprintk("%s: statfs error = %d\n", __func__, -error); 499 return error; 500 } 501 EXPORT_SYMBOL_GPL(nfs_statfs); 502 503 /* 504 * Map the security flavour number to a name 505 */ 506 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 507 { 508 static const struct { 509 rpc_authflavor_t flavour; 510 const char *str; 511 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { 512 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ 513 { RPC_AUTH_NULL, "null" }, 514 { RPC_AUTH_UNIX, "sys" }, 515 { RPC_AUTH_GSS_KRB5, "krb5" }, 516 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 517 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 518 { RPC_AUTH_GSS_LKEY, "lkey" }, 519 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 520 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 521 { RPC_AUTH_GSS_SPKM, "spkm" }, 522 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 523 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 524 { UINT_MAX, "unknown" } 525 }; 526 int i; 527 528 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 529 if (sec_flavours[i].flavour == flavour) 530 break; 531 } 532 return sec_flavours[i].str; 533 } 534 535 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 536 int showdefaults) 537 { 538 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 539 char *proto = NULL; 540 541 switch (sap->sa_family) { 542 case AF_INET: 543 switch (nfss->mountd_protocol) { 544 case IPPROTO_UDP: 545 proto = RPCBIND_NETID_UDP; 546 break; 547 case IPPROTO_TCP: 548 proto = RPCBIND_NETID_TCP; 549 break; 550 } 551 break; 552 case AF_INET6: 553 switch (nfss->mountd_protocol) { 554 case IPPROTO_UDP: 555 proto = RPCBIND_NETID_UDP6; 556 break; 557 case IPPROTO_TCP: 558 proto = RPCBIND_NETID_TCP6; 559 break; 560 } 561 break; 562 } 563 if (proto || showdefaults) 564 seq_printf(m, ",mountproto=%s", proto ?: "auto"); 565 } 566 567 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 568 int showdefaults) 569 { 570 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 571 572 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 573 return; 574 575 switch (sap->sa_family) { 576 case AF_INET: { 577 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 578 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 579 break; 580 } 581 case AF_INET6: { 582 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 583 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 584 break; 585 } 586 default: 587 if (showdefaults) 588 seq_puts(m, ",mountaddr=unspecified"); 589 } 590 591 if (nfss->mountd_version || showdefaults) 592 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 593 if ((nfss->mountd_port && 594 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 595 showdefaults) 596 seq_printf(m, ",mountport=%u", nfss->mountd_port); 597 598 nfs_show_mountd_netid(m, nfss, showdefaults); 599 } 600 601 #if IS_ENABLED(CONFIG_NFS_V4) 602 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 603 int showdefaults) 604 { 605 struct nfs_client *clp = nfss->nfs_client; 606 607 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 608 } 609 #else 610 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 611 int showdefaults) 612 { 613 } 614 #endif 615 616 static void nfs_show_nfs_version(struct seq_file *m, 617 unsigned int version, 618 unsigned int minorversion) 619 { 620 seq_printf(m, ",vers=%u", version); 621 if (version == 4) 622 seq_printf(m, ".%u", minorversion); 623 } 624 625 /* 626 * Describe the mount options in force on this server representation 627 */ 628 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 629 int showdefaults) 630 { 631 static const struct proc_nfs_info { 632 int flag; 633 const char *str; 634 const char *nostr; 635 } nfs_info[] = { 636 { NFS_MOUNT_SOFT, ",soft", "" }, 637 { NFS_MOUNT_SOFTERR, ",softerr", "" }, 638 { NFS_MOUNT_POSIX, ",posix", "" }, 639 { NFS_MOUNT_NOCTO, ",nocto", "" }, 640 { NFS_MOUNT_NOAC, ",noac", "" }, 641 { NFS_MOUNT_NONLM, ",nolock", "" }, 642 { NFS_MOUNT_NOACL, ",noacl", "" }, 643 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 644 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 645 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 646 { 0, NULL, NULL } 647 }; 648 const struct proc_nfs_info *nfs_infop; 649 struct nfs_client *clp = nfss->nfs_client; 650 u32 version = clp->rpc_ops->version; 651 int local_flock, local_fcntl; 652 653 nfs_show_nfs_version(m, version, clp->cl_minorversion); 654 seq_printf(m, ",rsize=%u", nfss->rsize); 655 seq_printf(m, ",wsize=%u", nfss->wsize); 656 if (nfss->bsize != 0) 657 seq_printf(m, ",bsize=%u", nfss->bsize); 658 seq_printf(m, ",namlen=%u", nfss->namelen); 659 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 660 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 661 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 662 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 663 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 664 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 665 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 666 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 667 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))) 668 seq_puts(m, ",hard"); 669 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 670 if (nfss->flags & nfs_infop->flag) 671 seq_puts(m, nfs_infop->str); 672 else 673 seq_puts(m, nfs_infop->nostr); 674 } 675 rcu_read_lock(); 676 seq_printf(m, ",proto=%s", 677 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 678 rcu_read_unlock(); 679 if (clp->cl_nconnect > 0) 680 seq_printf(m, ",nconnect=%u", clp->cl_nconnect); 681 if (version == 4) { 682 if (nfss->port != NFS_PORT) 683 seq_printf(m, ",port=%u", nfss->port); 684 } else 685 if (nfss->port) 686 seq_printf(m, ",port=%u", nfss->port); 687 688 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 689 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 690 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 691 692 if (version != 4) 693 nfs_show_mountd_options(m, nfss, showdefaults); 694 else 695 nfs_show_nfsv4_options(m, nfss, showdefaults); 696 697 if (nfss->options & NFS_OPTION_FSCACHE) 698 seq_puts(m, ",fsc"); 699 700 if (nfss->options & NFS_OPTION_MIGRATION) 701 seq_puts(m, ",migration"); 702 703 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 704 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 705 seq_puts(m, ",lookupcache=none"); 706 else 707 seq_puts(m, ",lookupcache=pos"); 708 } 709 710 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 711 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 712 713 if (!local_flock && !local_fcntl) 714 seq_puts(m, ",local_lock=none"); 715 else if (local_flock && local_fcntl) 716 seq_puts(m, ",local_lock=all"); 717 else if (local_flock) 718 seq_puts(m, ",local_lock=flock"); 719 else 720 seq_puts(m, ",local_lock=posix"); 721 } 722 723 /* 724 * Describe the mount options on this VFS mountpoint 725 */ 726 int nfs_show_options(struct seq_file *m, struct dentry *root) 727 { 728 struct nfs_server *nfss = NFS_SB(root->d_sb); 729 730 nfs_show_mount_options(m, nfss, 0); 731 732 rcu_read_lock(); 733 seq_printf(m, ",addr=%s", 734 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 735 RPC_DISPLAY_ADDR)); 736 rcu_read_unlock(); 737 738 return 0; 739 } 740 EXPORT_SYMBOL_GPL(nfs_show_options); 741 742 #if IS_ENABLED(CONFIG_NFS_V4) 743 static void show_lease(struct seq_file *m, struct nfs_server *server) 744 { 745 struct nfs_client *clp = server->nfs_client; 746 unsigned long expire; 747 748 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ); 749 expire = clp->cl_last_renewal + clp->cl_lease_time; 750 seq_printf(m, ",lease_expired=%ld", 751 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ); 752 } 753 #ifdef CONFIG_NFS_V4_1 754 static void show_sessions(struct seq_file *m, struct nfs_server *server) 755 { 756 if (nfs4_has_session(server->nfs_client)) 757 seq_puts(m, ",sessions"); 758 } 759 #else 760 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 761 #endif 762 #endif 763 764 #ifdef CONFIG_NFS_V4_1 765 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 766 { 767 seq_printf(m, ",pnfs="); 768 if (server->pnfs_curr_ld) 769 seq_printf(m, "%s", server->pnfs_curr_ld->name); 770 else 771 seq_printf(m, "not configured"); 772 } 773 774 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 775 { 776 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 777 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 778 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 779 "date='%llu,%u'", 780 impl_id->name, impl_id->domain, 781 impl_id->date.seconds, impl_id->date.nseconds); 782 } 783 } 784 #else 785 #if IS_ENABLED(CONFIG_NFS_V4) 786 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 787 { 788 } 789 #endif 790 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 791 { 792 } 793 #endif 794 795 int nfs_show_devname(struct seq_file *m, struct dentry *root) 796 { 797 char *page = (char *) __get_free_page(GFP_KERNEL); 798 char *devname, *dummy; 799 int err = 0; 800 if (!page) 801 return -ENOMEM; 802 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 803 if (IS_ERR(devname)) 804 err = PTR_ERR(devname); 805 else 806 seq_escape(m, devname, " \t\n\\"); 807 free_page((unsigned long)page); 808 return err; 809 } 810 EXPORT_SYMBOL_GPL(nfs_show_devname); 811 812 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 813 { 814 seq_puts(m, "/"); 815 return 0; 816 } 817 EXPORT_SYMBOL_GPL(nfs_show_path); 818 819 /* 820 * Present statistical information for this VFS mountpoint 821 */ 822 int nfs_show_stats(struct seq_file *m, struct dentry *root) 823 { 824 int i, cpu; 825 struct nfs_server *nfss = NFS_SB(root->d_sb); 826 struct rpc_auth *auth = nfss->client->cl_auth; 827 struct nfs_iostats totals = { }; 828 829 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 830 831 /* 832 * Display all mount option settings 833 */ 834 seq_puts(m, "\n\topts:\t"); 835 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw"); 836 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : ""); 837 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : ""); 838 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : ""); 839 nfs_show_mount_options(m, nfss, 1); 840 841 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 842 843 show_implementation_id(m, nfss); 844 845 seq_puts(m, "\n\tcaps:\t"); 846 seq_printf(m, "caps=0x%x", nfss->caps); 847 seq_printf(m, ",wtmult=%u", nfss->wtmult); 848 seq_printf(m, ",dtsize=%u", nfss->dtsize); 849 seq_printf(m, ",bsize=%u", nfss->bsize); 850 seq_printf(m, ",namlen=%u", nfss->namelen); 851 852 #if IS_ENABLED(CONFIG_NFS_V4) 853 if (nfss->nfs_client->rpc_ops->version == 4) { 854 seq_puts(m, "\n\tnfsv4:\t"); 855 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 856 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 857 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 858 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 859 show_sessions(m, nfss); 860 show_pnfs(m, nfss); 861 show_lease(m, nfss); 862 } 863 #endif 864 865 /* 866 * Display security flavor in effect for this mount 867 */ 868 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 869 if (auth->au_flavor) 870 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 871 872 /* 873 * Display superblock I/O counters 874 */ 875 for_each_possible_cpu(cpu) { 876 struct nfs_iostats *stats; 877 878 preempt_disable(); 879 stats = per_cpu_ptr(nfss->io_stats, cpu); 880 881 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 882 totals.events[i] += stats->events[i]; 883 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 884 totals.bytes[i] += stats->bytes[i]; 885 #ifdef CONFIG_NFS_FSCACHE 886 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 887 totals.fscache[i] += stats->fscache[i]; 888 #endif 889 890 preempt_enable(); 891 } 892 893 seq_puts(m, "\n\tevents:\t"); 894 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 895 seq_printf(m, "%lu ", totals.events[i]); 896 seq_puts(m, "\n\tbytes:\t"); 897 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 898 seq_printf(m, "%Lu ", totals.bytes[i]); 899 #ifdef CONFIG_NFS_FSCACHE 900 if (nfss->options & NFS_OPTION_FSCACHE) { 901 seq_puts(m, "\n\tfsc:\t"); 902 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 903 seq_printf(m, "%Lu ", totals.fscache[i]); 904 } 905 #endif 906 seq_putc(m, '\n'); 907 908 rpc_clnt_show_stats(m, nfss->client); 909 910 return 0; 911 } 912 EXPORT_SYMBOL_GPL(nfs_show_stats); 913 914 /* 915 * Begin unmount by attempting to remove all automounted mountpoints we added 916 * in response to xdev traversals and referrals 917 */ 918 void nfs_umount_begin(struct super_block *sb) 919 { 920 struct nfs_server *server; 921 struct rpc_clnt *rpc; 922 923 server = NFS_SB(sb); 924 /* -EIO all pending I/O */ 925 rpc = server->client_acl; 926 if (!IS_ERR(rpc)) 927 rpc_killall_tasks(rpc); 928 rpc = server->client; 929 if (!IS_ERR(rpc)) 930 rpc_killall_tasks(rpc); 931 } 932 EXPORT_SYMBOL_GPL(nfs_umount_begin); 933 934 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 935 { 936 struct nfs_parsed_mount_data *data; 937 938 data = kzalloc(sizeof(*data), GFP_KERNEL); 939 if (data) { 940 data->timeo = NFS_UNSPEC_TIMEO; 941 data->retrans = NFS_UNSPEC_RETRANS; 942 data->acregmin = NFS_DEF_ACREGMIN; 943 data->acregmax = NFS_DEF_ACREGMAX; 944 data->acdirmin = NFS_DEF_ACDIRMIN; 945 data->acdirmax = NFS_DEF_ACDIRMAX; 946 data->mount_server.port = NFS_UNSPEC_PORT; 947 data->nfs_server.port = NFS_UNSPEC_PORT; 948 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 949 data->selected_flavor = RPC_AUTH_MAXFLAVOR; 950 data->minorversion = 0; 951 data->need_mount = true; 952 data->net = current->nsproxy->net_ns; 953 data->lsm_opts = NULL; 954 } 955 return data; 956 } 957 958 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 959 { 960 if (data) { 961 kfree(data->client_address); 962 kfree(data->mount_server.hostname); 963 kfree(data->nfs_server.export_path); 964 kfree(data->nfs_server.hostname); 965 kfree(data->fscache_uniq); 966 security_free_mnt_opts(&data->lsm_opts); 967 kfree(data); 968 } 969 } 970 971 /* 972 * Sanity-check a server address provided by the mount command. 973 * 974 * Address family must be initialized, and address must not be 975 * the ANY address for that family. 976 */ 977 static int nfs_verify_server_address(struct sockaddr *addr) 978 { 979 switch (addr->sa_family) { 980 case AF_INET: { 981 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 982 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 983 } 984 case AF_INET6: { 985 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 986 return !ipv6_addr_any(sa); 987 } 988 } 989 990 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 991 return 0; 992 } 993 994 /* 995 * Select between a default port value and a user-specified port value. 996 * If a zero value is set, then autobind will be used. 997 */ 998 static void nfs_set_port(struct sockaddr *sap, int *port, 999 const unsigned short default_port) 1000 { 1001 if (*port == NFS_UNSPEC_PORT) 1002 *port = default_port; 1003 1004 rpc_set_port(sap, *port); 1005 } 1006 1007 /* 1008 * Sanity check the NFS transport protocol. 1009 * 1010 */ 1011 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 1012 { 1013 switch (mnt->nfs_server.protocol) { 1014 case XPRT_TRANSPORT_UDP: 1015 case XPRT_TRANSPORT_TCP: 1016 case XPRT_TRANSPORT_RDMA: 1017 break; 1018 default: 1019 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1020 } 1021 } 1022 1023 /* 1024 * For text based NFSv2/v3 mounts, the mount protocol transport default 1025 * settings should depend upon the specified NFS transport. 1026 */ 1027 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1028 { 1029 nfs_validate_transport_protocol(mnt); 1030 1031 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1032 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1033 return; 1034 switch (mnt->nfs_server.protocol) { 1035 case XPRT_TRANSPORT_UDP: 1036 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1037 break; 1038 case XPRT_TRANSPORT_TCP: 1039 case XPRT_TRANSPORT_RDMA: 1040 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1041 } 1042 } 1043 1044 /* 1045 * Add 'flavor' to 'auth_info' if not already present. 1046 * Returns true if 'flavor' ends up in the list, false otherwise 1047 */ 1048 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, 1049 rpc_authflavor_t flavor) 1050 { 1051 unsigned int i; 1052 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors); 1053 1054 /* make sure this flavor isn't already in the list */ 1055 for (i = 0; i < auth_info->flavor_len; i++) { 1056 if (flavor == auth_info->flavors[i]) 1057 return true; 1058 } 1059 1060 if (auth_info->flavor_len + 1 >= max_flavor_len) { 1061 dfprintk(MOUNT, "NFS: too many sec= flavors\n"); 1062 return false; 1063 } 1064 1065 auth_info->flavors[auth_info->flavor_len++] = flavor; 1066 return true; 1067 } 1068 1069 /* 1070 * Return true if 'match' is in auth_info or auth_info is empty. 1071 * Return false otherwise. 1072 */ 1073 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 1074 rpc_authflavor_t match) 1075 { 1076 int i; 1077 1078 if (!auth_info->flavor_len) 1079 return true; 1080 1081 for (i = 0; i < auth_info->flavor_len; i++) { 1082 if (auth_info->flavors[i] == match) 1083 return true; 1084 } 1085 return false; 1086 } 1087 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 1088 1089 /* 1090 * Parse the value of the 'sec=' option. 1091 */ 1092 static int nfs_parse_security_flavors(char *value, 1093 struct nfs_parsed_mount_data *mnt) 1094 { 1095 substring_t args[MAX_OPT_ARGS]; 1096 rpc_authflavor_t pseudoflavor; 1097 char *p; 1098 1099 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1100 1101 while ((p = strsep(&value, ":")) != NULL) { 1102 switch (match_token(p, nfs_secflavor_tokens, args)) { 1103 case Opt_sec_none: 1104 pseudoflavor = RPC_AUTH_NULL; 1105 break; 1106 case Opt_sec_sys: 1107 pseudoflavor = RPC_AUTH_UNIX; 1108 break; 1109 case Opt_sec_krb5: 1110 pseudoflavor = RPC_AUTH_GSS_KRB5; 1111 break; 1112 case Opt_sec_krb5i: 1113 pseudoflavor = RPC_AUTH_GSS_KRB5I; 1114 break; 1115 case Opt_sec_krb5p: 1116 pseudoflavor = RPC_AUTH_GSS_KRB5P; 1117 break; 1118 case Opt_sec_lkey: 1119 pseudoflavor = RPC_AUTH_GSS_LKEY; 1120 break; 1121 case Opt_sec_lkeyi: 1122 pseudoflavor = RPC_AUTH_GSS_LKEYI; 1123 break; 1124 case Opt_sec_lkeyp: 1125 pseudoflavor = RPC_AUTH_GSS_LKEYP; 1126 break; 1127 case Opt_sec_spkm: 1128 pseudoflavor = RPC_AUTH_GSS_SPKM; 1129 break; 1130 case Opt_sec_spkmi: 1131 pseudoflavor = RPC_AUTH_GSS_SPKMI; 1132 break; 1133 case Opt_sec_spkmp: 1134 pseudoflavor = RPC_AUTH_GSS_SPKMP; 1135 break; 1136 default: 1137 dfprintk(MOUNT, 1138 "NFS: sec= option '%s' not recognized\n", p); 1139 return 0; 1140 } 1141 1142 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor)) 1143 return 0; 1144 } 1145 1146 return 1; 1147 } 1148 1149 static int nfs_parse_version_string(char *string, 1150 struct nfs_parsed_mount_data *mnt, 1151 substring_t *args) 1152 { 1153 mnt->flags &= ~NFS_MOUNT_VER3; 1154 switch (match_token(string, nfs_vers_tokens, args)) { 1155 case Opt_vers_2: 1156 mnt->version = 2; 1157 break; 1158 case Opt_vers_3: 1159 mnt->flags |= NFS_MOUNT_VER3; 1160 mnt->version = 3; 1161 break; 1162 case Opt_vers_4: 1163 /* Backward compatibility option. In future, 1164 * the mount program should always supply 1165 * a NFSv4 minor version number. 1166 */ 1167 mnt->version = 4; 1168 break; 1169 case Opt_vers_4_0: 1170 mnt->version = 4; 1171 mnt->minorversion = 0; 1172 break; 1173 case Opt_vers_4_1: 1174 mnt->version = 4; 1175 mnt->minorversion = 1; 1176 break; 1177 case Opt_vers_4_2: 1178 mnt->version = 4; 1179 mnt->minorversion = 2; 1180 break; 1181 default: 1182 return 0; 1183 } 1184 return 1; 1185 } 1186 1187 static int nfs_get_option_str(substring_t args[], char **option) 1188 { 1189 kfree(*option); 1190 *option = match_strdup(args); 1191 return !*option; 1192 } 1193 1194 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1195 { 1196 int rc; 1197 char *string; 1198 1199 string = match_strdup(args); 1200 if (string == NULL) 1201 return -ENOMEM; 1202 rc = kstrtoul(string, 10, option); 1203 kfree(string); 1204 1205 return rc; 1206 } 1207 1208 static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option, 1209 unsigned long l_bound, unsigned long u_bound) 1210 { 1211 int ret; 1212 1213 ret = nfs_get_option_ul(args, option); 1214 if (ret != 0) 1215 return ret; 1216 if (*option < l_bound || *option > u_bound) 1217 return -ERANGE; 1218 return 0; 1219 } 1220 1221 /* 1222 * Error-check and convert a string of mount options from user space into 1223 * a data structure. The whole mount string is processed; bad options are 1224 * skipped as they are encountered. If there were no errors, return 1; 1225 * otherwise return 0 (zero). 1226 */ 1227 static int nfs_parse_mount_options(char *raw, 1228 struct nfs_parsed_mount_data *mnt) 1229 { 1230 char *p, *string; 1231 int rc, sloppy = 0, invalid_option = 0; 1232 unsigned short protofamily = AF_UNSPEC; 1233 unsigned short mountfamily = AF_UNSPEC; 1234 1235 if (!raw) { 1236 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1237 return 1; 1238 } 1239 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1240 1241 rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts); 1242 if (rc) 1243 goto out_security_failure; 1244 1245 while ((p = strsep(&raw, ",")) != NULL) { 1246 substring_t args[MAX_OPT_ARGS]; 1247 unsigned long option; 1248 int token; 1249 1250 if (!*p) 1251 continue; 1252 1253 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1254 1255 token = match_token(p, nfs_mount_option_tokens, args); 1256 switch (token) { 1257 1258 /* 1259 * boolean options: foo/nofoo 1260 */ 1261 case Opt_soft: 1262 mnt->flags |= NFS_MOUNT_SOFT; 1263 mnt->flags &= ~NFS_MOUNT_SOFTERR; 1264 break; 1265 case Opt_softerr: 1266 mnt->flags |= NFS_MOUNT_SOFTERR; 1267 mnt->flags &= ~NFS_MOUNT_SOFT; 1268 break; 1269 case Opt_hard: 1270 mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR); 1271 break; 1272 case Opt_posix: 1273 mnt->flags |= NFS_MOUNT_POSIX; 1274 break; 1275 case Opt_noposix: 1276 mnt->flags &= ~NFS_MOUNT_POSIX; 1277 break; 1278 case Opt_cto: 1279 mnt->flags &= ~NFS_MOUNT_NOCTO; 1280 break; 1281 case Opt_nocto: 1282 mnt->flags |= NFS_MOUNT_NOCTO; 1283 break; 1284 case Opt_ac: 1285 mnt->flags &= ~NFS_MOUNT_NOAC; 1286 break; 1287 case Opt_noac: 1288 mnt->flags |= NFS_MOUNT_NOAC; 1289 break; 1290 case Opt_lock: 1291 mnt->flags &= ~NFS_MOUNT_NONLM; 1292 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1293 NFS_MOUNT_LOCAL_FCNTL); 1294 break; 1295 case Opt_nolock: 1296 mnt->flags |= NFS_MOUNT_NONLM; 1297 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1298 NFS_MOUNT_LOCAL_FCNTL); 1299 break; 1300 case Opt_udp: 1301 mnt->flags &= ~NFS_MOUNT_TCP; 1302 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1303 break; 1304 case Opt_tcp: 1305 mnt->flags |= NFS_MOUNT_TCP; 1306 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1307 break; 1308 case Opt_rdma: 1309 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1310 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1311 xprt_load_transport(p); 1312 break; 1313 case Opt_acl: 1314 mnt->flags &= ~NFS_MOUNT_NOACL; 1315 break; 1316 case Opt_noacl: 1317 mnt->flags |= NFS_MOUNT_NOACL; 1318 break; 1319 case Opt_rdirplus: 1320 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1321 break; 1322 case Opt_nordirplus: 1323 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1324 break; 1325 case Opt_sharecache: 1326 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1327 break; 1328 case Opt_nosharecache: 1329 mnt->flags |= NFS_MOUNT_UNSHARED; 1330 break; 1331 case Opt_resvport: 1332 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1333 break; 1334 case Opt_noresvport: 1335 mnt->flags |= NFS_MOUNT_NORESVPORT; 1336 break; 1337 case Opt_fscache: 1338 mnt->options |= NFS_OPTION_FSCACHE; 1339 kfree(mnt->fscache_uniq); 1340 mnt->fscache_uniq = NULL; 1341 break; 1342 case Opt_nofscache: 1343 mnt->options &= ~NFS_OPTION_FSCACHE; 1344 kfree(mnt->fscache_uniq); 1345 mnt->fscache_uniq = NULL; 1346 break; 1347 case Opt_migration: 1348 mnt->options |= NFS_OPTION_MIGRATION; 1349 break; 1350 case Opt_nomigration: 1351 mnt->options &= ~NFS_OPTION_MIGRATION; 1352 break; 1353 1354 /* 1355 * options that take numeric values 1356 */ 1357 case Opt_port: 1358 if (nfs_get_option_ul(args, &option) || 1359 option > USHRT_MAX) 1360 goto out_invalid_value; 1361 mnt->nfs_server.port = option; 1362 break; 1363 case Opt_rsize: 1364 if (nfs_get_option_ul(args, &option)) 1365 goto out_invalid_value; 1366 mnt->rsize = option; 1367 break; 1368 case Opt_wsize: 1369 if (nfs_get_option_ul(args, &option)) 1370 goto out_invalid_value; 1371 mnt->wsize = option; 1372 break; 1373 case Opt_bsize: 1374 if (nfs_get_option_ul(args, &option)) 1375 goto out_invalid_value; 1376 mnt->bsize = option; 1377 break; 1378 case Opt_timeo: 1379 if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX)) 1380 goto out_invalid_value; 1381 mnt->timeo = option; 1382 break; 1383 case Opt_retrans: 1384 if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX)) 1385 goto out_invalid_value; 1386 mnt->retrans = option; 1387 break; 1388 case Opt_acregmin: 1389 if (nfs_get_option_ul(args, &option)) 1390 goto out_invalid_value; 1391 mnt->acregmin = option; 1392 break; 1393 case Opt_acregmax: 1394 if (nfs_get_option_ul(args, &option)) 1395 goto out_invalid_value; 1396 mnt->acregmax = option; 1397 break; 1398 case Opt_acdirmin: 1399 if (nfs_get_option_ul(args, &option)) 1400 goto out_invalid_value; 1401 mnt->acdirmin = option; 1402 break; 1403 case Opt_acdirmax: 1404 if (nfs_get_option_ul(args, &option)) 1405 goto out_invalid_value; 1406 mnt->acdirmax = option; 1407 break; 1408 case Opt_actimeo: 1409 if (nfs_get_option_ul(args, &option)) 1410 goto out_invalid_value; 1411 mnt->acregmin = mnt->acregmax = 1412 mnt->acdirmin = mnt->acdirmax = option; 1413 break; 1414 case Opt_namelen: 1415 if (nfs_get_option_ul(args, &option)) 1416 goto out_invalid_value; 1417 mnt->namlen = option; 1418 break; 1419 case Opt_mountport: 1420 if (nfs_get_option_ul(args, &option) || 1421 option > USHRT_MAX) 1422 goto out_invalid_value; 1423 mnt->mount_server.port = option; 1424 break; 1425 case Opt_mountvers: 1426 if (nfs_get_option_ul(args, &option) || 1427 option < NFS_MNT_VERSION || 1428 option > NFS_MNT3_VERSION) 1429 goto out_invalid_value; 1430 mnt->mount_server.version = option; 1431 break; 1432 case Opt_minorversion: 1433 if (nfs_get_option_ul(args, &option)) 1434 goto out_invalid_value; 1435 if (option > NFS4_MAX_MINOR_VERSION) 1436 goto out_invalid_value; 1437 mnt->minorversion = option; 1438 break; 1439 1440 /* 1441 * options that take text values 1442 */ 1443 case Opt_nfsvers: 1444 string = match_strdup(args); 1445 if (string == NULL) 1446 goto out_nomem; 1447 rc = nfs_parse_version_string(string, mnt, args); 1448 kfree(string); 1449 if (!rc) 1450 goto out_invalid_value; 1451 break; 1452 case Opt_sec: 1453 string = match_strdup(args); 1454 if (string == NULL) 1455 goto out_nomem; 1456 rc = nfs_parse_security_flavors(string, mnt); 1457 kfree(string); 1458 if (!rc) { 1459 dfprintk(MOUNT, "NFS: unrecognized " 1460 "security flavor\n"); 1461 return 0; 1462 } 1463 break; 1464 case Opt_proto: 1465 string = match_strdup(args); 1466 if (string == NULL) 1467 goto out_nomem; 1468 token = match_token(string, 1469 nfs_xprt_protocol_tokens, args); 1470 1471 protofamily = AF_INET; 1472 switch (token) { 1473 case Opt_xprt_udp6: 1474 protofamily = AF_INET6; 1475 /* fall through */ 1476 case Opt_xprt_udp: 1477 mnt->flags &= ~NFS_MOUNT_TCP; 1478 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1479 break; 1480 case Opt_xprt_tcp6: 1481 protofamily = AF_INET6; 1482 /* fall through */ 1483 case Opt_xprt_tcp: 1484 mnt->flags |= NFS_MOUNT_TCP; 1485 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1486 break; 1487 case Opt_xprt_rdma6: 1488 protofamily = AF_INET6; 1489 /* fall through */ 1490 case Opt_xprt_rdma: 1491 /* vector side protocols to TCP */ 1492 mnt->flags |= NFS_MOUNT_TCP; 1493 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1494 xprt_load_transport(string); 1495 break; 1496 default: 1497 dfprintk(MOUNT, "NFS: unrecognized " 1498 "transport protocol\n"); 1499 kfree(string); 1500 return 0; 1501 } 1502 kfree(string); 1503 break; 1504 case Opt_mountproto: 1505 string = match_strdup(args); 1506 if (string == NULL) 1507 goto out_nomem; 1508 token = match_token(string, 1509 nfs_xprt_protocol_tokens, args); 1510 kfree(string); 1511 1512 mountfamily = AF_INET; 1513 switch (token) { 1514 case Opt_xprt_udp6: 1515 mountfamily = AF_INET6; 1516 /* fall through */ 1517 case Opt_xprt_udp: 1518 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1519 break; 1520 case Opt_xprt_tcp6: 1521 mountfamily = AF_INET6; 1522 /* fall through */ 1523 case Opt_xprt_tcp: 1524 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1525 break; 1526 case Opt_xprt_rdma: /* not used for side protocols */ 1527 default: 1528 dfprintk(MOUNT, "NFS: unrecognized " 1529 "transport protocol\n"); 1530 return 0; 1531 } 1532 break; 1533 case Opt_addr: 1534 string = match_strdup(args); 1535 if (string == NULL) 1536 goto out_nomem; 1537 mnt->nfs_server.addrlen = 1538 rpc_pton(mnt->net, string, strlen(string), 1539 (struct sockaddr *) 1540 &mnt->nfs_server.address, 1541 sizeof(mnt->nfs_server.address)); 1542 kfree(string); 1543 if (mnt->nfs_server.addrlen == 0) 1544 goto out_invalid_address; 1545 break; 1546 case Opt_clientaddr: 1547 if (nfs_get_option_str(args, &mnt->client_address)) 1548 goto out_nomem; 1549 break; 1550 case Opt_mounthost: 1551 if (nfs_get_option_str(args, 1552 &mnt->mount_server.hostname)) 1553 goto out_nomem; 1554 break; 1555 case Opt_mountaddr: 1556 string = match_strdup(args); 1557 if (string == NULL) 1558 goto out_nomem; 1559 mnt->mount_server.addrlen = 1560 rpc_pton(mnt->net, string, strlen(string), 1561 (struct sockaddr *) 1562 &mnt->mount_server.address, 1563 sizeof(mnt->mount_server.address)); 1564 kfree(string); 1565 if (mnt->mount_server.addrlen == 0) 1566 goto out_invalid_address; 1567 break; 1568 case Opt_nconnect: 1569 if (nfs_get_option_ul_bound(args, &option, 1, NFS_MAX_CONNECTIONS)) 1570 goto out_invalid_value; 1571 mnt->nfs_server.nconnect = option; 1572 break; 1573 case Opt_lookupcache: 1574 string = match_strdup(args); 1575 if (string == NULL) 1576 goto out_nomem; 1577 token = match_token(string, 1578 nfs_lookupcache_tokens, args); 1579 kfree(string); 1580 switch (token) { 1581 case Opt_lookupcache_all: 1582 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1583 break; 1584 case Opt_lookupcache_positive: 1585 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1586 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1587 break; 1588 case Opt_lookupcache_none: 1589 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1590 break; 1591 default: 1592 dfprintk(MOUNT, "NFS: invalid " 1593 "lookupcache argument\n"); 1594 return 0; 1595 }; 1596 break; 1597 case Opt_fscache_uniq: 1598 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1599 goto out_nomem; 1600 mnt->options |= NFS_OPTION_FSCACHE; 1601 break; 1602 case Opt_local_lock: 1603 string = match_strdup(args); 1604 if (string == NULL) 1605 goto out_nomem; 1606 token = match_token(string, nfs_local_lock_tokens, 1607 args); 1608 kfree(string); 1609 switch (token) { 1610 case Opt_local_lock_all: 1611 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1612 NFS_MOUNT_LOCAL_FCNTL); 1613 break; 1614 case Opt_local_lock_flock: 1615 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1616 break; 1617 case Opt_local_lock_posix: 1618 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1619 break; 1620 case Opt_local_lock_none: 1621 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1622 NFS_MOUNT_LOCAL_FCNTL); 1623 break; 1624 default: 1625 dfprintk(MOUNT, "NFS: invalid " 1626 "local_lock argument\n"); 1627 return 0; 1628 }; 1629 break; 1630 1631 /* 1632 * Special options 1633 */ 1634 case Opt_sloppy: 1635 sloppy = 1; 1636 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1637 break; 1638 case Opt_userspace: 1639 case Opt_deprecated: 1640 dfprintk(MOUNT, "NFS: ignoring mount option " 1641 "'%s'\n", p); 1642 break; 1643 1644 default: 1645 invalid_option = 1; 1646 dfprintk(MOUNT, "NFS: unrecognized mount option " 1647 "'%s'\n", p); 1648 } 1649 } 1650 1651 if (!sloppy && invalid_option) 1652 return 0; 1653 1654 if (mnt->minorversion && mnt->version != 4) 1655 goto out_minorversion_mismatch; 1656 1657 if (mnt->options & NFS_OPTION_MIGRATION && 1658 (mnt->version != 4 || mnt->minorversion != 0)) 1659 goto out_migration_misuse; 1660 1661 /* 1662 * verify that any proto=/mountproto= options match the address 1663 * families in the addr=/mountaddr= options. 1664 */ 1665 if (protofamily != AF_UNSPEC && 1666 protofamily != mnt->nfs_server.address.ss_family) 1667 goto out_proto_mismatch; 1668 1669 if (mountfamily != AF_UNSPEC) { 1670 if (mnt->mount_server.addrlen) { 1671 if (mountfamily != mnt->mount_server.address.ss_family) 1672 goto out_mountproto_mismatch; 1673 } else { 1674 if (mountfamily != mnt->nfs_server.address.ss_family) 1675 goto out_mountproto_mismatch; 1676 } 1677 } 1678 1679 return 1; 1680 1681 out_mountproto_mismatch: 1682 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1683 "option\n"); 1684 return 0; 1685 out_proto_mismatch: 1686 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1687 return 0; 1688 out_invalid_address: 1689 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1690 return 0; 1691 out_invalid_value: 1692 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1693 return 0; 1694 out_minorversion_mismatch: 1695 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1696 "minorversion=%u\n", mnt->version, mnt->minorversion); 1697 return 0; 1698 out_migration_misuse: 1699 printk(KERN_INFO 1700 "NFS: 'migration' not supported for this NFS version\n"); 1701 return 0; 1702 out_nomem: 1703 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1704 return 0; 1705 out_security_failure: 1706 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1707 return 0; 1708 } 1709 1710 /* 1711 * Ensure that a specified authtype in args->auth_info is supported by 1712 * the server. Returns 0 and sets args->selected_flavor if it's ok, and 1713 * -EACCES if not. 1714 */ 1715 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args, 1716 rpc_authflavor_t *server_authlist, unsigned int count) 1717 { 1718 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 1719 bool found_auth_null = false; 1720 unsigned int i; 1721 1722 /* 1723 * If the sec= mount option is used, the specified flavor or AUTH_NULL 1724 * must be in the list returned by the server. 1725 * 1726 * AUTH_NULL has a special meaning when it's in the server list - it 1727 * means that the server will ignore the rpc creds, so any flavor 1728 * can be used but still use the sec= that was specified. 1729 * 1730 * Note also that the MNT procedure in MNTv1 does not return a list 1731 * of supported security flavors. In this case, nfs_mount() fabricates 1732 * a security flavor list containing just AUTH_NULL. 1733 */ 1734 for (i = 0; i < count; i++) { 1735 flavor = server_authlist[i]; 1736 1737 if (nfs_auth_info_match(&args->auth_info, flavor)) 1738 goto out; 1739 1740 if (flavor == RPC_AUTH_NULL) 1741 found_auth_null = true; 1742 } 1743 1744 if (found_auth_null) { 1745 flavor = args->auth_info.flavors[0]; 1746 goto out; 1747 } 1748 1749 dfprintk(MOUNT, 1750 "NFS: specified auth flavors not supported by server\n"); 1751 return -EACCES; 1752 1753 out: 1754 args->selected_flavor = flavor; 1755 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor); 1756 return 0; 1757 } 1758 1759 /* 1760 * Use the remote server's MOUNT service to request the NFS file handle 1761 * corresponding to the provided path. 1762 */ 1763 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1764 struct nfs_fh *root_fh, 1765 rpc_authflavor_t *server_authlist, 1766 unsigned int *server_authlist_len) 1767 { 1768 struct nfs_mount_request request = { 1769 .sap = (struct sockaddr *) 1770 &args->mount_server.address, 1771 .dirpath = args->nfs_server.export_path, 1772 .protocol = args->mount_server.protocol, 1773 .fh = root_fh, 1774 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1775 .auth_flav_len = server_authlist_len, 1776 .auth_flavs = server_authlist, 1777 .net = args->net, 1778 }; 1779 int status; 1780 1781 if (args->mount_server.version == 0) { 1782 switch (args->version) { 1783 default: 1784 args->mount_server.version = NFS_MNT3_VERSION; 1785 break; 1786 case 2: 1787 args->mount_server.version = NFS_MNT_VERSION; 1788 } 1789 } 1790 request.version = args->mount_server.version; 1791 1792 if (args->mount_server.hostname) 1793 request.hostname = args->mount_server.hostname; 1794 else 1795 request.hostname = args->nfs_server.hostname; 1796 1797 /* 1798 * Construct the mount server's address. 1799 */ 1800 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1801 memcpy(request.sap, &args->nfs_server.address, 1802 args->nfs_server.addrlen); 1803 args->mount_server.addrlen = args->nfs_server.addrlen; 1804 } 1805 request.salen = args->mount_server.addrlen; 1806 nfs_set_port(request.sap, &args->mount_server.port, 0); 1807 1808 /* 1809 * Now ask the mount server to map our export path 1810 * to a file handle. 1811 */ 1812 status = nfs_mount(&request); 1813 if (status != 0) { 1814 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1815 request.hostname, status); 1816 return status; 1817 } 1818 1819 return 0; 1820 } 1821 1822 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, 1823 struct nfs_subversion *nfs_mod) 1824 { 1825 int status; 1826 unsigned int i; 1827 bool tried_auth_unix = false; 1828 bool auth_null_in_list = false; 1829 struct nfs_server *server = ERR_PTR(-EACCES); 1830 struct nfs_parsed_mount_data *args = mount_info->parsed; 1831 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 1832 unsigned int authlist_len = ARRAY_SIZE(authlist); 1833 1834 status = nfs_request_mount(args, mount_info->mntfh, authlist, 1835 &authlist_len); 1836 if (status) 1837 return ERR_PTR(status); 1838 1839 /* 1840 * Was a sec= authflavor specified in the options? First, verify 1841 * whether the server supports it, and then just try to use it if so. 1842 */ 1843 if (args->auth_info.flavor_len > 0) { 1844 status = nfs_verify_authflavors(args, authlist, authlist_len); 1845 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 1846 args->selected_flavor); 1847 if (status) 1848 return ERR_PTR(status); 1849 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1850 } 1851 1852 /* 1853 * No sec= option was provided. RFC 2623, section 2.7 suggests we 1854 * SHOULD prefer the flavor listed first. However, some servers list 1855 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 1856 */ 1857 for (i = 0; i < authlist_len; ++i) { 1858 rpc_authflavor_t flavor; 1859 struct rpcsec_gss_info info; 1860 1861 flavor = authlist[i]; 1862 switch (flavor) { 1863 case RPC_AUTH_UNIX: 1864 tried_auth_unix = true; 1865 break; 1866 case RPC_AUTH_NULL: 1867 auth_null_in_list = true; 1868 continue; 1869 default: 1870 if (rpcauth_get_gssinfo(flavor, &info) != 0) 1871 continue; 1872 /* Fallthrough */ 1873 } 1874 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 1875 args->selected_flavor = flavor; 1876 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1877 if (!IS_ERR(server)) 1878 return server; 1879 } 1880 1881 /* 1882 * Nothing we tried so far worked. At this point, give up if we've 1883 * already tried AUTH_UNIX or if the server's list doesn't contain 1884 * AUTH_NULL 1885 */ 1886 if (tried_auth_unix || !auth_null_in_list) 1887 return server; 1888 1889 /* Last chance! Try AUTH_UNIX */ 1890 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 1891 args->selected_flavor = RPC_AUTH_UNIX; 1892 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1893 } 1894 1895 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1896 struct nfs_mount_info *mount_info, 1897 struct nfs_subversion *nfs_mod) 1898 { 1899 struct nfs_server *server; 1900 1901 if (mount_info->parsed->need_mount) 1902 server = nfs_try_mount_request(mount_info, nfs_mod); 1903 else 1904 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1905 1906 if (IS_ERR(server)) 1907 return ERR_CAST(server); 1908 1909 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1910 } 1911 EXPORT_SYMBOL_GPL(nfs_try_mount); 1912 1913 /* 1914 * Split "dev_name" into "hostname:export_path". 1915 * 1916 * The leftmost colon demarks the split between the server's hostname 1917 * and the export path. If the hostname starts with a left square 1918 * bracket, then it may contain colons. 1919 * 1920 * Note: caller frees hostname and export path, even on error. 1921 */ 1922 static int nfs_parse_devname(const char *dev_name, 1923 char **hostname, size_t maxnamlen, 1924 char **export_path, size_t maxpathlen) 1925 { 1926 size_t len; 1927 char *end; 1928 1929 if (unlikely(!dev_name || !*dev_name)) { 1930 dfprintk(MOUNT, "NFS: device name not specified\n"); 1931 return -EINVAL; 1932 } 1933 1934 /* Is the host name protected with square brakcets? */ 1935 if (*dev_name == '[') { 1936 end = strchr(++dev_name, ']'); 1937 if (end == NULL || end[1] != ':') 1938 goto out_bad_devname; 1939 1940 len = end - dev_name; 1941 end++; 1942 } else { 1943 char *comma; 1944 1945 end = strchr(dev_name, ':'); 1946 if (end == NULL) 1947 goto out_bad_devname; 1948 len = end - dev_name; 1949 1950 /* kill possible hostname list: not supported */ 1951 comma = strchr(dev_name, ','); 1952 if (comma != NULL && comma < end) 1953 len = comma - dev_name; 1954 } 1955 1956 if (len > maxnamlen) 1957 goto out_hostname; 1958 1959 /* N.B. caller will free nfs_server.hostname in all cases */ 1960 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1961 if (*hostname == NULL) 1962 goto out_nomem; 1963 len = strlen(++end); 1964 if (len > maxpathlen) 1965 goto out_path; 1966 *export_path = kstrndup(end, len, GFP_KERNEL); 1967 if (!*export_path) 1968 goto out_nomem; 1969 1970 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1971 return 0; 1972 1973 out_bad_devname: 1974 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1975 return -EINVAL; 1976 1977 out_nomem: 1978 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1979 return -ENOMEM; 1980 1981 out_hostname: 1982 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1983 return -ENAMETOOLONG; 1984 1985 out_path: 1986 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1987 return -ENAMETOOLONG; 1988 } 1989 1990 /* 1991 * Validate the NFS2/NFS3 mount data 1992 * - fills in the mount root filehandle 1993 * 1994 * For option strings, user space handles the following behaviors: 1995 * 1996 * + DNS: mapping server host name to IP address ("addr=" option) 1997 * 1998 * + failure mode: how to behave if a mount request can't be handled 1999 * immediately ("fg/bg" option) 2000 * 2001 * + retry: how often to retry a mount request ("retry=" option) 2002 * 2003 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 2004 * mountproto=tcp after mountproto=udp, and so on 2005 */ 2006 static int nfs23_validate_mount_data(void *options, 2007 struct nfs_parsed_mount_data *args, 2008 struct nfs_fh *mntfh, 2009 const char *dev_name) 2010 { 2011 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 2012 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2013 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; 2014 2015 if (data == NULL) 2016 goto out_no_data; 2017 2018 args->version = NFS_DEFAULT_VERSION; 2019 switch (data->version) { 2020 case 1: 2021 data->namlen = 0; /* fall through */ 2022 case 2: 2023 data->bsize = 0; /* fall through */ 2024 case 3: 2025 if (data->flags & NFS_MOUNT_VER3) 2026 goto out_no_v3; 2027 data->root.size = NFS2_FHSIZE; 2028 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 2029 /* Turn off security negotiation */ 2030 extra_flags |= NFS_MOUNT_SECFLAVOUR; 2031 /* fall through */ 2032 case 4: 2033 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2034 goto out_no_sec; 2035 /* fall through */ 2036 case 5: 2037 memset(data->context, 0, sizeof(data->context)); 2038 /* fall through */ 2039 case 6: 2040 if (data->flags & NFS_MOUNT_VER3) { 2041 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 2042 goto out_invalid_fh; 2043 mntfh->size = data->root.size; 2044 args->version = 3; 2045 } else { 2046 mntfh->size = NFS2_FHSIZE; 2047 args->version = 2; 2048 } 2049 2050 2051 memcpy(mntfh->data, data->root.data, mntfh->size); 2052 if (mntfh->size < sizeof(mntfh->data)) 2053 memset(mntfh->data + mntfh->size, 0, 2054 sizeof(mntfh->data) - mntfh->size); 2055 2056 /* 2057 * Translate to nfs_parsed_mount_data, which nfs_fill_super 2058 * can deal with. 2059 */ 2060 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 2061 args->flags |= extra_flags; 2062 args->rsize = data->rsize; 2063 args->wsize = data->wsize; 2064 args->timeo = data->timeo; 2065 args->retrans = data->retrans; 2066 args->acregmin = data->acregmin; 2067 args->acregmax = data->acregmax; 2068 args->acdirmin = data->acdirmin; 2069 args->acdirmax = data->acdirmax; 2070 args->need_mount = false; 2071 2072 memcpy(sap, &data->addr, sizeof(data->addr)); 2073 args->nfs_server.addrlen = sizeof(data->addr); 2074 args->nfs_server.port = ntohs(data->addr.sin_port); 2075 if (sap->sa_family != AF_INET || 2076 !nfs_verify_server_address(sap)) 2077 goto out_no_address; 2078 2079 if (!(data->flags & NFS_MOUNT_TCP)) 2080 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 2081 /* N.B. caller will free nfs_server.hostname in all cases */ 2082 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 2083 args->namlen = data->namlen; 2084 args->bsize = data->bsize; 2085 2086 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2087 args->selected_flavor = data->pseudoflavor; 2088 else 2089 args->selected_flavor = RPC_AUTH_UNIX; 2090 if (!args->nfs_server.hostname) 2091 goto out_nomem; 2092 2093 if (!(data->flags & NFS_MOUNT_NONLM)) 2094 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 2095 NFS_MOUNT_LOCAL_FCNTL); 2096 else 2097 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 2098 NFS_MOUNT_LOCAL_FCNTL); 2099 /* 2100 * The legacy version 6 binary mount data from userspace has a 2101 * field used only to transport selinux information into the 2102 * the kernel. To continue to support that functionality we 2103 * have a touch of selinux knowledge here in the NFS code. The 2104 * userspace code converted context=blah to just blah so we are 2105 * converting back to the full string selinux understands. 2106 */ 2107 if (data->context[0]){ 2108 #ifdef CONFIG_SECURITY_SELINUX 2109 int rc; 2110 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 2111 rc = security_add_mnt_opt("context", data->context, 2112 strlen(data->context), &args->lsm_opts); 2113 if (rc) 2114 return rc; 2115 #else 2116 return -EINVAL; 2117 #endif 2118 } 2119 2120 break; 2121 default: 2122 return NFS_TEXT_DATA; 2123 } 2124 2125 return 0; 2126 2127 out_no_data: 2128 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2129 return -EINVAL; 2130 2131 out_no_v3: 2132 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2133 data->version); 2134 return -EINVAL; 2135 2136 out_no_sec: 2137 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2138 return -EINVAL; 2139 2140 out_nomem: 2141 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2142 return -ENOMEM; 2143 2144 out_no_address: 2145 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2146 return -EINVAL; 2147 2148 out_invalid_fh: 2149 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2150 return -EINVAL; 2151 } 2152 2153 #if IS_ENABLED(CONFIG_NFS_V4) 2154 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2155 void *options, 2156 struct nfs_parsed_mount_data *args, 2157 struct nfs_fh *mntfh, 2158 const char *dev_name) 2159 { 2160 if (fs_type == &nfs_fs_type) 2161 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2162 return nfs4_validate_mount_data(options, args, dev_name); 2163 } 2164 #else 2165 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2166 void *options, 2167 struct nfs_parsed_mount_data *args, 2168 struct nfs_fh *mntfh, 2169 const char *dev_name) 2170 { 2171 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2172 } 2173 #endif 2174 2175 static int nfs_validate_text_mount_data(void *options, 2176 struct nfs_parsed_mount_data *args, 2177 const char *dev_name) 2178 { 2179 int port = 0; 2180 int max_namelen = PAGE_SIZE; 2181 int max_pathlen = NFS_MAXPATHLEN; 2182 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2183 2184 if (nfs_parse_mount_options((char *)options, args) == 0) 2185 return -EINVAL; 2186 2187 if (!nfs_verify_server_address(sap)) 2188 goto out_no_address; 2189 2190 if (args->version == 4) { 2191 #if IS_ENABLED(CONFIG_NFS_V4) 2192 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA) 2193 port = NFS_RDMA_PORT; 2194 else 2195 port = NFS_PORT; 2196 max_namelen = NFS4_MAXNAMLEN; 2197 max_pathlen = NFS4_MAXPATHLEN; 2198 nfs_validate_transport_protocol(args); 2199 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2200 goto out_invalid_transport_udp; 2201 nfs4_validate_mount_flags(args); 2202 #else 2203 goto out_v4_not_compiled; 2204 #endif /* CONFIG_NFS_V4 */ 2205 } else { 2206 nfs_set_mount_transport_protocol(args); 2207 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA) 2208 port = NFS_RDMA_PORT; 2209 } 2210 2211 nfs_set_port(sap, &args->nfs_server.port, port); 2212 2213 return nfs_parse_devname(dev_name, 2214 &args->nfs_server.hostname, 2215 max_namelen, 2216 &args->nfs_server.export_path, 2217 max_pathlen); 2218 2219 #if !IS_ENABLED(CONFIG_NFS_V4) 2220 out_v4_not_compiled: 2221 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2222 return -EPROTONOSUPPORT; 2223 #else 2224 out_invalid_transport_udp: 2225 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2226 return -EINVAL; 2227 #endif /* !CONFIG_NFS_V4 */ 2228 2229 out_no_address: 2230 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2231 return -EINVAL; 2232 } 2233 2234 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 2235 | NFS_MOUNT_SECURE \ 2236 | NFS_MOUNT_TCP \ 2237 | NFS_MOUNT_VER3 \ 2238 | NFS_MOUNT_KERBEROS \ 2239 | NFS_MOUNT_NONLM \ 2240 | NFS_MOUNT_BROKEN_SUID \ 2241 | NFS_MOUNT_STRICTLOCK \ 2242 | NFS_MOUNT_LEGACY_INTERFACE) 2243 2244 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 2245 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 2246 2247 static int 2248 nfs_compare_remount_data(struct nfs_server *nfss, 2249 struct nfs_parsed_mount_data *data) 2250 { 2251 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 2252 data->rsize != nfss->rsize || 2253 data->wsize != nfss->wsize || 2254 data->version != nfss->nfs_client->rpc_ops->version || 2255 data->minorversion != nfss->nfs_client->cl_minorversion || 2256 data->retrans != nfss->client->cl_timeout->to_retries || 2257 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) || 2258 data->acregmin != nfss->acregmin / HZ || 2259 data->acregmax != nfss->acregmax / HZ || 2260 data->acdirmin != nfss->acdirmin / HZ || 2261 data->acdirmax != nfss->acdirmax / HZ || 2262 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2263 data->nfs_server.port != nfss->port || 2264 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2265 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2266 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2267 return -EINVAL; 2268 2269 return 0; 2270 } 2271 2272 int 2273 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2274 { 2275 int error; 2276 struct nfs_server *nfss = sb->s_fs_info; 2277 struct nfs_parsed_mount_data *data; 2278 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2279 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2280 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2281 2282 sync_filesystem(sb); 2283 2284 /* 2285 * Userspace mount programs that send binary options generally send 2286 * them populated with default values. We have no way to know which 2287 * ones were explicitly specified. Fall back to legacy behavior and 2288 * just return success. 2289 */ 2290 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2291 (nfsvers <= 3 && (!options || (options->version >= 1 && 2292 options->version <= 6)))) 2293 return 0; 2294 2295 data = nfs_alloc_parsed_mount_data(); 2296 if (data == NULL) 2297 return -ENOMEM; 2298 2299 /* fill out struct with values from existing mount */ 2300 data->flags = nfss->flags; 2301 data->rsize = nfss->rsize; 2302 data->wsize = nfss->wsize; 2303 data->retrans = nfss->client->cl_timeout->to_retries; 2304 data->selected_flavor = nfss->client->cl_auth->au_flavor; 2305 data->acregmin = nfss->acregmin / HZ; 2306 data->acregmax = nfss->acregmax / HZ; 2307 data->acdirmin = nfss->acdirmin / HZ; 2308 data->acdirmax = nfss->acdirmax / HZ; 2309 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2310 data->nfs_server.port = nfss->port; 2311 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2312 data->version = nfsvers; 2313 data->minorversion = nfss->nfs_client->cl_minorversion; 2314 data->net = current->nsproxy->net_ns; 2315 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2316 data->nfs_server.addrlen); 2317 2318 /* overwrite those values with any that were specified */ 2319 error = -EINVAL; 2320 if (!nfs_parse_mount_options((char *)options, data)) 2321 goto out; 2322 2323 /* 2324 * noac is a special case. It implies -o sync, but that's not 2325 * necessarily reflected in the mtab options. do_remount_sb 2326 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the 2327 * remount options, so we have to explicitly reset it. 2328 */ 2329 if (data->flags & NFS_MOUNT_NOAC) 2330 *flags |= SB_SYNCHRONOUS; 2331 2332 /* compare new mount options with old ones */ 2333 error = nfs_compare_remount_data(nfss, data); 2334 if (!error) 2335 error = security_sb_remount(sb, data->lsm_opts); 2336 out: 2337 nfs_free_parsed_mount_data(data); 2338 return error; 2339 } 2340 EXPORT_SYMBOL_GPL(nfs_remount); 2341 2342 /* 2343 * Initialise the common bits of the superblock 2344 */ 2345 static void nfs_initialise_sb(struct super_block *sb) 2346 { 2347 struct nfs_server *server = NFS_SB(sb); 2348 2349 sb->s_magic = NFS_SUPER_MAGIC; 2350 2351 /* We probably want something more informative here */ 2352 snprintf(sb->s_id, sizeof(sb->s_id), 2353 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2354 2355 if (sb->s_blocksize == 0) 2356 sb->s_blocksize = nfs_block_bits(server->wsize, 2357 &sb->s_blocksize_bits); 2358 2359 nfs_super_set_maxbytes(sb, server->maxfilesize); 2360 } 2361 2362 /* 2363 * Finish setting up an NFS2/3 superblock 2364 */ 2365 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2366 { 2367 struct nfs_parsed_mount_data *data = mount_info->parsed; 2368 struct nfs_server *server = NFS_SB(sb); 2369 2370 sb->s_blocksize_bits = 0; 2371 sb->s_blocksize = 0; 2372 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2373 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2374 if (data && data->bsize) 2375 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2376 2377 if (server->nfs_client->rpc_ops->version != 2) { 2378 /* The VFS shouldn't apply the umask to mode bits. We will do 2379 * so ourselves when necessary. 2380 */ 2381 sb->s_flags |= SB_POSIXACL; 2382 sb->s_time_gran = 1; 2383 sb->s_export_op = &nfs_export_ops; 2384 } 2385 2386 nfs_initialise_sb(sb); 2387 } 2388 EXPORT_SYMBOL_GPL(nfs_fill_super); 2389 2390 /* 2391 * Finish setting up a cloned NFS2/3/4 superblock 2392 */ 2393 static void nfs_clone_super(struct super_block *sb, 2394 struct nfs_mount_info *mount_info) 2395 { 2396 const struct super_block *old_sb = mount_info->cloned->sb; 2397 struct nfs_server *server = NFS_SB(sb); 2398 2399 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2400 sb->s_blocksize = old_sb->s_blocksize; 2401 sb->s_maxbytes = old_sb->s_maxbytes; 2402 sb->s_xattr = old_sb->s_xattr; 2403 sb->s_op = old_sb->s_op; 2404 sb->s_time_gran = 1; 2405 sb->s_export_op = old_sb->s_export_op; 2406 2407 if (server->nfs_client->rpc_ops->version != 2) { 2408 /* The VFS shouldn't apply the umask to mode bits. We will do 2409 * so ourselves when necessary. 2410 */ 2411 sb->s_flags |= SB_POSIXACL; 2412 } 2413 2414 nfs_initialise_sb(sb); 2415 } 2416 2417 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2418 { 2419 const struct nfs_server *a = s->s_fs_info; 2420 const struct rpc_clnt *clnt_a = a->client; 2421 const struct rpc_clnt *clnt_b = b->client; 2422 2423 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2424 goto Ebusy; 2425 if (a->nfs_client != b->nfs_client) 2426 goto Ebusy; 2427 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 2428 goto Ebusy; 2429 if (a->wsize != b->wsize) 2430 goto Ebusy; 2431 if (a->rsize != b->rsize) 2432 goto Ebusy; 2433 if (a->acregmin != b->acregmin) 2434 goto Ebusy; 2435 if (a->acregmax != b->acregmax) 2436 goto Ebusy; 2437 if (a->acdirmin != b->acdirmin) 2438 goto Ebusy; 2439 if (a->acdirmax != b->acdirmax) 2440 goto Ebusy; 2441 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2442 goto Ebusy; 2443 return 1; 2444 Ebusy: 2445 return 0; 2446 } 2447 2448 struct nfs_sb_mountdata { 2449 struct nfs_server *server; 2450 int mntflags; 2451 }; 2452 2453 static int nfs_set_super(struct super_block *s, void *data) 2454 { 2455 struct nfs_sb_mountdata *sb_mntdata = data; 2456 struct nfs_server *server = sb_mntdata->server; 2457 int ret; 2458 2459 s->s_flags = sb_mntdata->mntflags; 2460 s->s_fs_info = server; 2461 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2462 ret = set_anon_super(s, server); 2463 if (ret == 0) 2464 server->s_dev = s->s_dev; 2465 return ret; 2466 } 2467 2468 static int nfs_compare_super_address(struct nfs_server *server1, 2469 struct nfs_server *server2) 2470 { 2471 struct sockaddr *sap1, *sap2; 2472 struct rpc_xprt *xprt1 = server1->client->cl_xprt; 2473 struct rpc_xprt *xprt2 = server2->client->cl_xprt; 2474 2475 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) 2476 return 0; 2477 2478 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2479 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2480 2481 if (sap1->sa_family != sap2->sa_family) 2482 return 0; 2483 2484 switch (sap1->sa_family) { 2485 case AF_INET: { 2486 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2487 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2488 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2489 return 0; 2490 if (sin1->sin_port != sin2->sin_port) 2491 return 0; 2492 break; 2493 } 2494 case AF_INET6: { 2495 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2496 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2497 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2498 return 0; 2499 if (sin1->sin6_port != sin2->sin6_port) 2500 return 0; 2501 break; 2502 } 2503 default: 2504 return 0; 2505 } 2506 2507 return 1; 2508 } 2509 2510 static int nfs_compare_userns(const struct nfs_server *old, 2511 const struct nfs_server *new) 2512 { 2513 const struct user_namespace *oldns = &init_user_ns; 2514 const struct user_namespace *newns = &init_user_ns; 2515 2516 if (old->client && old->client->cl_cred) 2517 oldns = old->client->cl_cred->user_ns; 2518 if (new->client && new->client->cl_cred) 2519 newns = new->client->cl_cred->user_ns; 2520 if (oldns != newns) 2521 return 0; 2522 return 1; 2523 } 2524 2525 static int nfs_compare_super(struct super_block *sb, void *data) 2526 { 2527 struct nfs_sb_mountdata *sb_mntdata = data; 2528 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2529 int mntflags = sb_mntdata->mntflags; 2530 2531 if (!nfs_compare_super_address(old, server)) 2532 return 0; 2533 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2534 if (old->flags & NFS_MOUNT_UNSHARED) 2535 return 0; 2536 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2537 return 0; 2538 if (!nfs_compare_userns(old, server)) 2539 return 0; 2540 return nfs_compare_mount_options(sb, server, mntflags); 2541 } 2542 2543 #ifdef CONFIG_NFS_FSCACHE 2544 static void nfs_get_cache_cookie(struct super_block *sb, 2545 struct nfs_parsed_mount_data *parsed, 2546 struct nfs_clone_mount *cloned) 2547 { 2548 struct nfs_server *nfss = NFS_SB(sb); 2549 char *uniq = NULL; 2550 int ulen = 0; 2551 2552 nfss->fscache_key = NULL; 2553 nfss->fscache = NULL; 2554 2555 if (parsed) { 2556 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2557 return; 2558 if (parsed->fscache_uniq) { 2559 uniq = parsed->fscache_uniq; 2560 ulen = strlen(parsed->fscache_uniq); 2561 } 2562 } else if (cloned) { 2563 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2564 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2565 return; 2566 if (mnt_s->fscache_key) { 2567 uniq = mnt_s->fscache_key->key.uniquifier; 2568 ulen = mnt_s->fscache_key->key.uniq_len; 2569 }; 2570 } else 2571 return; 2572 2573 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2574 } 2575 #else 2576 static void nfs_get_cache_cookie(struct super_block *sb, 2577 struct nfs_parsed_mount_data *parsed, 2578 struct nfs_clone_mount *cloned) 2579 { 2580 } 2581 #endif 2582 2583 int nfs_set_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 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2589 kflags |= SECURITY_LSM_NATIVE_LABELS; 2590 2591 error = security_sb_set_mnt_opts(s, mount_info->parsed->lsm_opts, 2592 kflags, &kflags_out); 2593 if (error) 2594 goto err; 2595 2596 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2597 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2598 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2599 err: 2600 return error; 2601 } 2602 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2603 2604 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2605 struct nfs_mount_info *mount_info) 2606 { 2607 int error; 2608 unsigned long kflags = 0, kflags_out = 0; 2609 2610 /* clone any lsm security options from the parent to the new sb */ 2611 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2612 return -ESTALE; 2613 2614 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2615 kflags |= SECURITY_LSM_NATIVE_LABELS; 2616 2617 error = security_sb_clone_mnt_opts(mount_info->cloned->sb, s, kflags, 2618 &kflags_out); 2619 if (error) 2620 return error; 2621 2622 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2623 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2624 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2625 return 0; 2626 } 2627 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2628 2629 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2630 int flags, const char *dev_name, 2631 struct nfs_mount_info *mount_info, 2632 struct nfs_subversion *nfs_mod) 2633 { 2634 struct super_block *s; 2635 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2636 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2637 struct nfs_sb_mountdata sb_mntdata = { 2638 .mntflags = flags, 2639 .server = server, 2640 }; 2641 int error; 2642 2643 if (server->flags & NFS_MOUNT_UNSHARED) 2644 compare_super = NULL; 2645 2646 /* -o noac implies -o sync */ 2647 if (server->flags & NFS_MOUNT_NOAC) 2648 sb_mntdata.mntflags |= SB_SYNCHRONOUS; 2649 2650 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) 2651 if (mount_info->cloned->sb->s_flags & SB_SYNCHRONOUS) 2652 sb_mntdata.mntflags |= SB_SYNCHRONOUS; 2653 2654 /* Get a superblock - note that we may end up sharing one that already exists */ 2655 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2656 if (IS_ERR(s)) { 2657 mntroot = ERR_CAST(s); 2658 goto out_err_nosb; 2659 } 2660 2661 if (s->s_fs_info != server) { 2662 nfs_free_server(server); 2663 server = NULL; 2664 } else { 2665 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev), 2666 MINOR(server->s_dev)); 2667 if (error) { 2668 mntroot = ERR_PTR(error); 2669 goto error_splat_super; 2670 } 2671 s->s_bdi->ra_pages = server->rpages * NFS_MAX_READAHEAD; 2672 server->super = s; 2673 } 2674 2675 if (!s->s_root) { 2676 /* initial superblock/root creation */ 2677 mount_info->fill_super(s, mount_info); 2678 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2679 if (!(server->flags & NFS_MOUNT_UNSHARED)) 2680 s->s_iflags |= SB_I_MULTIROOT; 2681 } 2682 2683 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2684 if (IS_ERR(mntroot)) 2685 goto error_splat_super; 2686 2687 error = mount_info->set_security(s, mntroot, mount_info); 2688 if (error) 2689 goto error_splat_root; 2690 2691 s->s_flags |= SB_ACTIVE; 2692 2693 out: 2694 return mntroot; 2695 2696 out_err_nosb: 2697 nfs_free_server(server); 2698 goto out; 2699 2700 error_splat_root: 2701 dput(mntroot); 2702 mntroot = ERR_PTR(error); 2703 error_splat_super: 2704 deactivate_locked_super(s); 2705 goto out; 2706 } 2707 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2708 2709 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2710 int flags, const char *dev_name, void *raw_data) 2711 { 2712 struct nfs_mount_info mount_info = { 2713 .fill_super = nfs_fill_super, 2714 .set_security = nfs_set_sb_security, 2715 }; 2716 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2717 struct nfs_subversion *nfs_mod; 2718 int error; 2719 2720 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2721 mount_info.mntfh = nfs_alloc_fhandle(); 2722 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2723 goto out; 2724 2725 /* Validate the mount data */ 2726 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2727 if (error == NFS_TEXT_DATA) 2728 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2729 if (error < 0) { 2730 mntroot = ERR_PTR(error); 2731 goto out; 2732 } 2733 2734 nfs_mod = get_nfs_version(mount_info.parsed->version); 2735 if (IS_ERR(nfs_mod)) { 2736 mntroot = ERR_CAST(nfs_mod); 2737 goto out; 2738 } 2739 2740 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2741 2742 put_nfs_version(nfs_mod); 2743 out: 2744 nfs_free_parsed_mount_data(mount_info.parsed); 2745 nfs_free_fhandle(mount_info.mntfh); 2746 return mntroot; 2747 } 2748 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2749 2750 /* 2751 * Destroy an NFS2/3 superblock 2752 */ 2753 void nfs_kill_super(struct super_block *s) 2754 { 2755 struct nfs_server *server = NFS_SB(s); 2756 dev_t dev = s->s_dev; 2757 2758 generic_shutdown_super(s); 2759 2760 nfs_fscache_release_super_cookie(s); 2761 2762 nfs_free_server(server); 2763 free_anon_bdev(dev); 2764 } 2765 EXPORT_SYMBOL_GPL(nfs_kill_super); 2766 2767 /* 2768 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2769 */ 2770 static struct dentry * 2771 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2772 const char *dev_name, void *raw_data) 2773 { 2774 struct nfs_clone_mount *data = raw_data; 2775 struct nfs_mount_info mount_info = { 2776 .fill_super = nfs_clone_super, 2777 .set_security = nfs_clone_sb_security, 2778 .cloned = data, 2779 }; 2780 struct nfs_server *server; 2781 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2782 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2783 2784 dprintk("--> nfs_xdev_mount()\n"); 2785 2786 mount_info.mntfh = mount_info.cloned->fh; 2787 2788 /* create a new volume representation */ 2789 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2790 2791 if (IS_ERR(server)) 2792 mntroot = ERR_CAST(server); 2793 else 2794 mntroot = nfs_fs_mount_common(server, flags, 2795 dev_name, &mount_info, nfs_mod); 2796 2797 dprintk("<-- nfs_xdev_mount() = %ld\n", 2798 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2799 return mntroot; 2800 } 2801 2802 #if IS_ENABLED(CONFIG_NFS_V4) 2803 2804 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2805 { 2806 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2807 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2808 } 2809 2810 /* 2811 * Validate NFSv4 mount options 2812 */ 2813 static int nfs4_validate_mount_data(void *options, 2814 struct nfs_parsed_mount_data *args, 2815 const char *dev_name) 2816 { 2817 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2818 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2819 char *c; 2820 2821 if (data == NULL) 2822 goto out_no_data; 2823 2824 args->version = 4; 2825 2826 switch (data->version) { 2827 case 1: 2828 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2829 goto out_no_address; 2830 if (data->host_addrlen == 0) 2831 goto out_no_address; 2832 args->nfs_server.addrlen = data->host_addrlen; 2833 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2834 return -EFAULT; 2835 if (!nfs_verify_server_address(sap)) 2836 goto out_no_address; 2837 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2838 2839 if (data->auth_flavourlen) { 2840 rpc_authflavor_t pseudoflavor; 2841 if (data->auth_flavourlen > 1) 2842 goto out_inval_auth; 2843 if (copy_from_user(&pseudoflavor, 2844 data->auth_flavours, 2845 sizeof(pseudoflavor))) 2846 return -EFAULT; 2847 args->selected_flavor = pseudoflavor; 2848 } else 2849 args->selected_flavor = RPC_AUTH_UNIX; 2850 2851 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2852 if (IS_ERR(c)) 2853 return PTR_ERR(c); 2854 args->nfs_server.hostname = c; 2855 2856 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2857 if (IS_ERR(c)) 2858 return PTR_ERR(c); 2859 args->nfs_server.export_path = c; 2860 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2861 2862 c = strndup_user(data->client_addr.data, 16); 2863 if (IS_ERR(c)) 2864 return PTR_ERR(c); 2865 args->client_address = c; 2866 2867 /* 2868 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2869 * can deal with. 2870 */ 2871 2872 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2873 args->rsize = data->rsize; 2874 args->wsize = data->wsize; 2875 args->timeo = data->timeo; 2876 args->retrans = data->retrans; 2877 args->acregmin = data->acregmin; 2878 args->acregmax = data->acregmax; 2879 args->acdirmin = data->acdirmin; 2880 args->acdirmax = data->acdirmax; 2881 args->nfs_server.protocol = data->proto; 2882 nfs_validate_transport_protocol(args); 2883 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2884 goto out_invalid_transport_udp; 2885 2886 break; 2887 default: 2888 return NFS_TEXT_DATA; 2889 } 2890 2891 return 0; 2892 2893 out_no_data: 2894 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2895 return -EINVAL; 2896 2897 out_inval_auth: 2898 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2899 data->auth_flavourlen); 2900 return -EINVAL; 2901 2902 out_no_address: 2903 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2904 return -EINVAL; 2905 2906 out_invalid_transport_udp: 2907 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2908 return -EINVAL; 2909 } 2910 2911 /* 2912 * NFS v4 module parameters need to stay in the 2913 * NFS client for backwards compatibility 2914 */ 2915 unsigned int nfs_callback_set_tcpport; 2916 unsigned short nfs_callback_nr_threads; 2917 /* Default cache timeout is 10 minutes */ 2918 unsigned int nfs_idmap_cache_timeout = 600; 2919 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2920 bool nfs4_disable_idmapping = true; 2921 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2922 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE; 2923 unsigned short send_implementation_id = 1; 2924 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2925 bool recover_lost_locks = false; 2926 2927 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads); 2928 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2929 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2930 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2931 EXPORT_SYMBOL_GPL(max_session_slots); 2932 EXPORT_SYMBOL_GPL(max_session_cb_slots); 2933 EXPORT_SYMBOL_GPL(send_implementation_id); 2934 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2935 EXPORT_SYMBOL_GPL(recover_lost_locks); 2936 2937 #define NFS_CALLBACK_MAXPORTNR (65535U) 2938 2939 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2940 { 2941 unsigned long num; 2942 int ret; 2943 2944 if (!val) 2945 return -EINVAL; 2946 ret = kstrtoul(val, 0, &num); 2947 if (ret || num > NFS_CALLBACK_MAXPORTNR) 2948 return -EINVAL; 2949 *((unsigned int *)kp->arg) = num; 2950 return 0; 2951 } 2952 static const struct kernel_param_ops param_ops_portnr = { 2953 .set = param_set_portnr, 2954 .get = param_get_uint, 2955 }; 2956 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2957 2958 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2959 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644); 2960 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be " 2961 "assigned to the NFSv4 callback channels."); 2962 module_param(nfs_idmap_cache_timeout, int, 0644); 2963 module_param(nfs4_disable_idmapping, bool, 0644); 2964 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2965 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2966 MODULE_PARM_DESC(nfs4_disable_idmapping, 2967 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2968 module_param(max_session_slots, ushort, 0644); 2969 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2970 "requests the client will negotiate"); 2971 module_param(max_session_cb_slots, ushort, 0644); 2972 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 " 2973 "callbacks the client will process for a given server"); 2974 module_param(send_implementation_id, ushort, 0644); 2975 MODULE_PARM_DESC(send_implementation_id, 2976 "Send implementation ID with NFSv4.1 exchange_id"); 2977 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2978 2979 module_param(recover_lost_locks, bool, 0644); 2980 MODULE_PARM_DESC(recover_lost_locks, 2981 "If the server reports that a lock might be lost, " 2982 "try to recover it risking data corruption."); 2983 2984 2985 #endif /* CONFIG_NFS_V4 */ 2986