1 /* 2 * linux/fs/nfs/super.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs superblock handling functions 7 * 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 * Split from inode.c by David Howells <dhowells@redhat.com> 15 * 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a 17 * particular server are held in the same superblock 18 * - NFS superblocks can have several effective roots to the dentry tree 19 * - directory type roots are spliced into the tree when a path from one root reaches the root 20 * of another (see nfs_lookup()) 21 */ 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 26 #include <linux/time.h> 27 #include <linux/kernel.h> 28 #include <linux/mm.h> 29 #include <linux/string.h> 30 #include <linux/stat.h> 31 #include <linux/errno.h> 32 #include <linux/unistd.h> 33 #include <linux/sunrpc/clnt.h> 34 #include <linux/sunrpc/addr.h> 35 #include <linux/sunrpc/stats.h> 36 #include <linux/sunrpc/metrics.h> 37 #include <linux/sunrpc/xprtsock.h> 38 #include <linux/sunrpc/xprtrdma.h> 39 #include <linux/nfs_fs.h> 40 #include <linux/nfs_mount.h> 41 #include <linux/nfs4_mount.h> 42 #include <linux/lockd/bind.h> 43 #include <linux/seq_file.h> 44 #include <linux/mount.h> 45 #include <linux/namei.h> 46 #include <linux/nfs_idmap.h> 47 #include <linux/vfs.h> 48 #include <linux/inet.h> 49 #include <linux/in6.h> 50 #include <linux/slab.h> 51 #include <net/ipv6.h> 52 #include <linux/netdevice.h> 53 #include <linux/nfs_xdr.h> 54 #include <linux/magic.h> 55 #include <linux/parser.h> 56 #include <linux/nsproxy.h> 57 #include <linux/rcupdate.h> 58 59 #include <asm/uaccess.h> 60 61 #include "nfs4_fs.h" 62 #include "callback.h" 63 #include "delegation.h" 64 #include "iostat.h" 65 #include "internal.h" 66 #include "fscache.h" 67 #include "nfs4session.h" 68 #include "pnfs.h" 69 #include "nfs.h" 70 71 #define NFSDBG_FACILITY NFSDBG_VFS 72 #define NFS_TEXT_DATA 1 73 74 #if IS_ENABLED(CONFIG_NFS_V3) 75 #define NFS_DEFAULT_VERSION 3 76 #else 77 #define NFS_DEFAULT_VERSION 2 78 #endif 79 80 enum { 81 /* Mount options that take no arguments */ 82 Opt_soft, Opt_hard, 83 Opt_posix, Opt_noposix, 84 Opt_cto, Opt_nocto, 85 Opt_ac, Opt_noac, 86 Opt_lock, Opt_nolock, 87 Opt_udp, Opt_tcp, Opt_rdma, 88 Opt_acl, Opt_noacl, 89 Opt_rdirplus, Opt_nordirplus, 90 Opt_sharecache, Opt_nosharecache, 91 Opt_resvport, Opt_noresvport, 92 Opt_fscache, Opt_nofscache, 93 Opt_migration, Opt_nomigration, 94 95 /* Mount options that take integer arguments */ 96 Opt_port, 97 Opt_rsize, Opt_wsize, Opt_bsize, 98 Opt_timeo, Opt_retrans, 99 Opt_acregmin, Opt_acregmax, 100 Opt_acdirmin, Opt_acdirmax, 101 Opt_actimeo, 102 Opt_namelen, 103 Opt_mountport, 104 Opt_mountvers, 105 Opt_minorversion, 106 107 /* Mount options that take string arguments */ 108 Opt_nfsvers, 109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 110 Opt_addr, Opt_mountaddr, Opt_clientaddr, 111 Opt_lookupcache, 112 Opt_fscache_uniq, 113 Opt_local_lock, 114 115 /* Special mount options */ 116 Opt_userspace, Opt_deprecated, Opt_sloppy, 117 118 Opt_err 119 }; 120 121 static const match_table_t nfs_mount_option_tokens = { 122 { Opt_userspace, "bg" }, 123 { Opt_userspace, "fg" }, 124 { Opt_userspace, "retry=%s" }, 125 126 { Opt_sloppy, "sloppy" }, 127 128 { Opt_soft, "soft" }, 129 { Opt_hard, "hard" }, 130 { Opt_deprecated, "intr" }, 131 { Opt_deprecated, "nointr" }, 132 { Opt_posix, "posix" }, 133 { Opt_noposix, "noposix" }, 134 { Opt_cto, "cto" }, 135 { Opt_nocto, "nocto" }, 136 { Opt_ac, "ac" }, 137 { Opt_noac, "noac" }, 138 { Opt_lock, "lock" }, 139 { Opt_nolock, "nolock" }, 140 { Opt_udp, "udp" }, 141 { Opt_tcp, "tcp" }, 142 { Opt_rdma, "rdma" }, 143 { Opt_acl, "acl" }, 144 { Opt_noacl, "noacl" }, 145 { Opt_rdirplus, "rdirplus" }, 146 { Opt_nordirplus, "nordirplus" }, 147 { Opt_sharecache, "sharecache" }, 148 { Opt_nosharecache, "nosharecache" }, 149 { Opt_resvport, "resvport" }, 150 { Opt_noresvport, "noresvport" }, 151 { Opt_fscache, "fsc" }, 152 { Opt_nofscache, "nofsc" }, 153 { Opt_migration, "migration" }, 154 { Opt_nomigration, "nomigration" }, 155 156 { Opt_port, "port=%s" }, 157 { Opt_rsize, "rsize=%s" }, 158 { Opt_wsize, "wsize=%s" }, 159 { Opt_bsize, "bsize=%s" }, 160 { Opt_timeo, "timeo=%s" }, 161 { Opt_retrans, "retrans=%s" }, 162 { Opt_acregmin, "acregmin=%s" }, 163 { Opt_acregmax, "acregmax=%s" }, 164 { Opt_acdirmin, "acdirmin=%s" }, 165 { Opt_acdirmax, "acdirmax=%s" }, 166 { Opt_actimeo, "actimeo=%s" }, 167 { Opt_namelen, "namlen=%s" }, 168 { Opt_mountport, "mountport=%s" }, 169 { Opt_mountvers, "mountvers=%s" }, 170 { Opt_minorversion, "minorversion=%s" }, 171 172 { Opt_nfsvers, "nfsvers=%s" }, 173 { Opt_nfsvers, "vers=%s" }, 174 175 { Opt_sec, "sec=%s" }, 176 { Opt_proto, "proto=%s" }, 177 { Opt_mountproto, "mountproto=%s" }, 178 { Opt_addr, "addr=%s" }, 179 { Opt_clientaddr, "clientaddr=%s" }, 180 { Opt_mounthost, "mounthost=%s" }, 181 { Opt_mountaddr, "mountaddr=%s" }, 182 183 { Opt_lookupcache, "lookupcache=%s" }, 184 { Opt_fscache_uniq, "fsc=%s" }, 185 { Opt_local_lock, "local_lock=%s" }, 186 187 /* The following needs to be listed after all other options */ 188 { Opt_nfsvers, "v%s" }, 189 190 { Opt_err, NULL } 191 }; 192 193 enum { 194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 195 196 Opt_xprt_err 197 }; 198 199 static const match_table_t nfs_xprt_protocol_tokens = { 200 { Opt_xprt_udp, "udp" }, 201 { Opt_xprt_udp6, "udp6" }, 202 { Opt_xprt_tcp, "tcp" }, 203 { Opt_xprt_tcp6, "tcp6" }, 204 { Opt_xprt_rdma, "rdma" }, 205 206 { Opt_xprt_err, NULL } 207 }; 208 209 enum { 210 Opt_sec_none, Opt_sec_sys, 211 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 212 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 213 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 214 215 Opt_sec_err 216 }; 217 218 static const match_table_t nfs_secflavor_tokens = { 219 { Opt_sec_none, "none" }, 220 { Opt_sec_none, "null" }, 221 { Opt_sec_sys, "sys" }, 222 223 { Opt_sec_krb5, "krb5" }, 224 { Opt_sec_krb5i, "krb5i" }, 225 { Opt_sec_krb5p, "krb5p" }, 226 227 { Opt_sec_lkey, "lkey" }, 228 { Opt_sec_lkeyi, "lkeyi" }, 229 { Opt_sec_lkeyp, "lkeyp" }, 230 231 { Opt_sec_spkm, "spkm3" }, 232 { Opt_sec_spkmi, "spkm3i" }, 233 { Opt_sec_spkmp, "spkm3p" }, 234 235 { Opt_sec_err, NULL } 236 }; 237 238 enum { 239 Opt_lookupcache_all, Opt_lookupcache_positive, 240 Opt_lookupcache_none, 241 242 Opt_lookupcache_err 243 }; 244 245 static match_table_t nfs_lookupcache_tokens = { 246 { Opt_lookupcache_all, "all" }, 247 { Opt_lookupcache_positive, "pos" }, 248 { Opt_lookupcache_positive, "positive" }, 249 { Opt_lookupcache_none, "none" }, 250 251 { Opt_lookupcache_err, NULL } 252 }; 253 254 enum { 255 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 256 Opt_local_lock_none, 257 258 Opt_local_lock_err 259 }; 260 261 static match_table_t nfs_local_lock_tokens = { 262 { Opt_local_lock_all, "all" }, 263 { Opt_local_lock_flock, "flock" }, 264 { Opt_local_lock_posix, "posix" }, 265 { Opt_local_lock_none, "none" }, 266 267 { Opt_local_lock_err, NULL } 268 }; 269 270 enum { 271 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 272 Opt_vers_4_1, Opt_vers_4_2, 273 274 Opt_vers_err 275 }; 276 277 static match_table_t nfs_vers_tokens = { 278 { Opt_vers_2, "2" }, 279 { Opt_vers_3, "3" }, 280 { Opt_vers_4, "4" }, 281 { Opt_vers_4_0, "4.0" }, 282 { Opt_vers_4_1, "4.1" }, 283 { Opt_vers_4_2, "4.2" }, 284 285 { Opt_vers_err, NULL } 286 }; 287 288 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 289 int flags, const char *dev_name, void *raw_data); 290 291 struct file_system_type nfs_fs_type = { 292 .owner = THIS_MODULE, 293 .name = "nfs", 294 .mount = nfs_fs_mount, 295 .kill_sb = nfs_kill_super, 296 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 297 }; 298 MODULE_ALIAS_FS("nfs"); 299 EXPORT_SYMBOL_GPL(nfs_fs_type); 300 301 struct file_system_type nfs_xdev_fs_type = { 302 .owner = THIS_MODULE, 303 .name = "nfs", 304 .mount = nfs_xdev_mount, 305 .kill_sb = nfs_kill_super, 306 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 307 }; 308 309 const struct super_operations nfs_sops = { 310 .alloc_inode = nfs_alloc_inode, 311 .destroy_inode = nfs_destroy_inode, 312 .write_inode = nfs_write_inode, 313 .drop_inode = nfs_drop_inode, 314 .put_super = nfs_put_super, 315 .statfs = nfs_statfs, 316 .evict_inode = nfs_evict_inode, 317 .umount_begin = nfs_umount_begin, 318 .show_options = nfs_show_options, 319 .show_devname = nfs_show_devname, 320 .show_path = nfs_show_path, 321 .show_stats = nfs_show_stats, 322 .remount_fs = nfs_remount, 323 }; 324 EXPORT_SYMBOL_GPL(nfs_sops); 325 326 #if IS_ENABLED(CONFIG_NFS_V4) 327 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 328 static int nfs4_validate_mount_data(void *options, 329 struct nfs_parsed_mount_data *args, const char *dev_name); 330 331 struct file_system_type nfs4_fs_type = { 332 .owner = THIS_MODULE, 333 .name = "nfs4", 334 .mount = nfs_fs_mount, 335 .kill_sb = nfs_kill_super, 336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 337 }; 338 MODULE_ALIAS_FS("nfs4"); 339 MODULE_ALIAS("nfs4"); 340 EXPORT_SYMBOL_GPL(nfs4_fs_type); 341 342 static int __init register_nfs4_fs(void) 343 { 344 return register_filesystem(&nfs4_fs_type); 345 } 346 347 static void unregister_nfs4_fs(void) 348 { 349 unregister_filesystem(&nfs4_fs_type); 350 } 351 #else 352 static int __init register_nfs4_fs(void) 353 { 354 return 0; 355 } 356 357 static void unregister_nfs4_fs(void) 358 { 359 } 360 #endif 361 362 static struct shrinker acl_shrinker = { 363 .count_objects = nfs_access_cache_count, 364 .scan_objects = nfs_access_cache_scan, 365 .seeks = DEFAULT_SEEKS, 366 }; 367 368 /* 369 * Register the NFS filesystems 370 */ 371 int __init register_nfs_fs(void) 372 { 373 int ret; 374 375 ret = register_filesystem(&nfs_fs_type); 376 if (ret < 0) 377 goto error_0; 378 379 ret = register_nfs4_fs(); 380 if (ret < 0) 381 goto error_1; 382 383 ret = nfs_register_sysctl(); 384 if (ret < 0) 385 goto error_2; 386 register_shrinker(&acl_shrinker); 387 return 0; 388 389 error_2: 390 unregister_nfs4_fs(); 391 error_1: 392 unregister_filesystem(&nfs_fs_type); 393 error_0: 394 return ret; 395 } 396 397 /* 398 * Unregister the NFS filesystems 399 */ 400 void __exit unregister_nfs_fs(void) 401 { 402 unregister_shrinker(&acl_shrinker); 403 nfs_unregister_sysctl(); 404 unregister_nfs4_fs(); 405 unregister_filesystem(&nfs_fs_type); 406 } 407 408 void nfs_sb_active(struct super_block *sb) 409 { 410 struct nfs_server *server = NFS_SB(sb); 411 412 if (atomic_inc_return(&server->active) == 1) 413 atomic_inc(&sb->s_active); 414 } 415 EXPORT_SYMBOL_GPL(nfs_sb_active); 416 417 void nfs_sb_deactive(struct super_block *sb) 418 { 419 struct nfs_server *server = NFS_SB(sb); 420 421 if (atomic_dec_and_test(&server->active)) 422 deactivate_super(sb); 423 } 424 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 425 426 /* 427 * Deliver file system statistics to userspace 428 */ 429 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 430 { 431 struct nfs_server *server = NFS_SB(dentry->d_sb); 432 unsigned char blockbits; 433 unsigned long blockres; 434 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 435 struct nfs_fsstat res; 436 int error = -ENOMEM; 437 438 res.fattr = nfs_alloc_fattr(); 439 if (res.fattr == NULL) 440 goto out_err; 441 442 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 443 if (unlikely(error == -ESTALE)) { 444 struct dentry *pd_dentry; 445 446 pd_dentry = dget_parent(dentry); 447 if (pd_dentry != NULL) { 448 nfs_zap_caches(pd_dentry->d_inode); 449 dput(pd_dentry); 450 } 451 } 452 nfs_free_fattr(res.fattr); 453 if (error < 0) 454 goto out_err; 455 456 buf->f_type = NFS_SUPER_MAGIC; 457 458 /* 459 * Current versions of glibc do not correctly handle the 460 * case where f_frsize != f_bsize. Eventually we want to 461 * report the value of wtmult in this field. 462 */ 463 buf->f_frsize = dentry->d_sb->s_blocksize; 464 465 /* 466 * On most *nix systems, f_blocks, f_bfree, and f_bavail 467 * are reported in units of f_frsize. Linux hasn't had 468 * an f_frsize field in its statfs struct until recently, 469 * thus historically Linux's sys_statfs reports these 470 * fields in units of f_bsize. 471 */ 472 buf->f_bsize = dentry->d_sb->s_blocksize; 473 blockbits = dentry->d_sb->s_blocksize_bits; 474 blockres = (1 << blockbits) - 1; 475 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 476 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 477 buf->f_bavail = (res.abytes + blockres) >> blockbits; 478 479 buf->f_files = res.tfiles; 480 buf->f_ffree = res.afiles; 481 482 buf->f_namelen = server->namelen; 483 484 return 0; 485 486 out_err: 487 dprintk("%s: statfs error = %d\n", __func__, -error); 488 return error; 489 } 490 EXPORT_SYMBOL_GPL(nfs_statfs); 491 492 /* 493 * Map the security flavour number to a name 494 */ 495 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 496 { 497 static const struct { 498 rpc_authflavor_t flavour; 499 const char *str; 500 } sec_flavours[] = { 501 { RPC_AUTH_NULL, "null" }, 502 { RPC_AUTH_UNIX, "sys" }, 503 { RPC_AUTH_GSS_KRB5, "krb5" }, 504 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 505 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 506 { RPC_AUTH_GSS_LKEY, "lkey" }, 507 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 508 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 509 { RPC_AUTH_GSS_SPKM, "spkm" }, 510 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 511 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 512 { UINT_MAX, "unknown" } 513 }; 514 int i; 515 516 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 517 if (sec_flavours[i].flavour == flavour) 518 break; 519 } 520 return sec_flavours[i].str; 521 } 522 523 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 524 int showdefaults) 525 { 526 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 527 528 seq_printf(m, ",mountproto="); 529 switch (sap->sa_family) { 530 case AF_INET: 531 switch (nfss->mountd_protocol) { 532 case IPPROTO_UDP: 533 seq_printf(m, RPCBIND_NETID_UDP); 534 break; 535 case IPPROTO_TCP: 536 seq_printf(m, RPCBIND_NETID_TCP); 537 break; 538 default: 539 if (showdefaults) 540 seq_printf(m, "auto"); 541 } 542 break; 543 case AF_INET6: 544 switch (nfss->mountd_protocol) { 545 case IPPROTO_UDP: 546 seq_printf(m, RPCBIND_NETID_UDP6); 547 break; 548 case IPPROTO_TCP: 549 seq_printf(m, RPCBIND_NETID_TCP6); 550 break; 551 default: 552 if (showdefaults) 553 seq_printf(m, "auto"); 554 } 555 break; 556 default: 557 if (showdefaults) 558 seq_printf(m, "auto"); 559 } 560 } 561 562 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 563 int showdefaults) 564 { 565 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 566 567 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 568 return; 569 570 switch (sap->sa_family) { 571 case AF_INET: { 572 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 573 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 574 break; 575 } 576 case AF_INET6: { 577 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 578 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 579 break; 580 } 581 default: 582 if (showdefaults) 583 seq_printf(m, ",mountaddr=unspecified"); 584 } 585 586 if (nfss->mountd_version || showdefaults) 587 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 588 if ((nfss->mountd_port && 589 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 590 showdefaults) 591 seq_printf(m, ",mountport=%u", nfss->mountd_port); 592 593 nfs_show_mountd_netid(m, nfss, showdefaults); 594 } 595 596 #if IS_ENABLED(CONFIG_NFS_V4) 597 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 598 int showdefaults) 599 { 600 struct nfs_client *clp = nfss->nfs_client; 601 602 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 603 } 604 #else 605 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 606 int showdefaults) 607 { 608 } 609 #endif 610 611 static void nfs_show_nfs_version(struct seq_file *m, 612 unsigned int version, 613 unsigned int minorversion) 614 { 615 seq_printf(m, ",vers=%u", version); 616 if (version == 4) 617 seq_printf(m, ".%u", minorversion); 618 } 619 620 /* 621 * Describe the mount options in force on this server representation 622 */ 623 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 624 int showdefaults) 625 { 626 static const struct proc_nfs_info { 627 int flag; 628 const char *str; 629 const char *nostr; 630 } nfs_info[] = { 631 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 632 { NFS_MOUNT_POSIX, ",posix", "" }, 633 { NFS_MOUNT_NOCTO, ",nocto", "" }, 634 { NFS_MOUNT_NOAC, ",noac", "" }, 635 { NFS_MOUNT_NONLM, ",nolock", "" }, 636 { NFS_MOUNT_NOACL, ",noacl", "" }, 637 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 638 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 639 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 640 { 0, NULL, NULL } 641 }; 642 const struct proc_nfs_info *nfs_infop; 643 struct nfs_client *clp = nfss->nfs_client; 644 u32 version = clp->rpc_ops->version; 645 int local_flock, local_fcntl; 646 647 nfs_show_nfs_version(m, version, clp->cl_minorversion); 648 seq_printf(m, ",rsize=%u", nfss->rsize); 649 seq_printf(m, ",wsize=%u", nfss->wsize); 650 if (nfss->bsize != 0) 651 seq_printf(m, ",bsize=%u", nfss->bsize); 652 seq_printf(m, ",namlen=%u", nfss->namelen); 653 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 654 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 655 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 656 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 657 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 658 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 659 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 660 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 661 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 662 if (nfss->flags & nfs_infop->flag) 663 seq_puts(m, nfs_infop->str); 664 else 665 seq_puts(m, nfs_infop->nostr); 666 } 667 rcu_read_lock(); 668 seq_printf(m, ",proto=%s", 669 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 670 rcu_read_unlock(); 671 if (version == 4) { 672 if (nfss->port != NFS_PORT) 673 seq_printf(m, ",port=%u", nfss->port); 674 } else 675 if (nfss->port) 676 seq_printf(m, ",port=%u", nfss->port); 677 678 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 679 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 680 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 681 682 if (version != 4) 683 nfs_show_mountd_options(m, nfss, showdefaults); 684 else 685 nfs_show_nfsv4_options(m, nfss, showdefaults); 686 687 if (nfss->options & NFS_OPTION_FSCACHE) 688 seq_printf(m, ",fsc"); 689 690 if (nfss->options & NFS_OPTION_MIGRATION) 691 seq_printf(m, ",migration"); 692 693 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 695 seq_printf(m, ",lookupcache=none"); 696 else 697 seq_printf(m, ",lookupcache=pos"); 698 } 699 700 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 701 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 702 703 if (!local_flock && !local_fcntl) 704 seq_printf(m, ",local_lock=none"); 705 else if (local_flock && local_fcntl) 706 seq_printf(m, ",local_lock=all"); 707 else if (local_flock) 708 seq_printf(m, ",local_lock=flock"); 709 else 710 seq_printf(m, ",local_lock=posix"); 711 } 712 713 /* 714 * Describe the mount options on this VFS mountpoint 715 */ 716 int nfs_show_options(struct seq_file *m, struct dentry *root) 717 { 718 struct nfs_server *nfss = NFS_SB(root->d_sb); 719 720 nfs_show_mount_options(m, nfss, 0); 721 722 rcu_read_lock(); 723 seq_printf(m, ",addr=%s", 724 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 725 RPC_DISPLAY_ADDR)); 726 rcu_read_unlock(); 727 728 return 0; 729 } 730 EXPORT_SYMBOL_GPL(nfs_show_options); 731 732 #if IS_ENABLED(CONFIG_NFS_V4) 733 #ifdef CONFIG_NFS_V4_1 734 static void show_sessions(struct seq_file *m, struct nfs_server *server) 735 { 736 if (nfs4_has_session(server->nfs_client)) 737 seq_printf(m, ",sessions"); 738 } 739 #else 740 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 741 #endif 742 #endif 743 744 #ifdef CONFIG_NFS_V4_1 745 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 746 { 747 seq_printf(m, ",pnfs="); 748 if (server->pnfs_curr_ld) 749 seq_printf(m, "%s", server->pnfs_curr_ld->name); 750 else 751 seq_printf(m, "not configured"); 752 } 753 754 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 755 { 756 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 757 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 758 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 759 "date='%llu,%u'", 760 impl_id->name, impl_id->domain, 761 impl_id->date.seconds, impl_id->date.nseconds); 762 } 763 } 764 #else 765 #if IS_ENABLED(CONFIG_NFS_V4) 766 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 767 { 768 } 769 #endif 770 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 771 { 772 } 773 #endif 774 775 int nfs_show_devname(struct seq_file *m, struct dentry *root) 776 { 777 char *page = (char *) __get_free_page(GFP_KERNEL); 778 char *devname, *dummy; 779 int err = 0; 780 if (!page) 781 return -ENOMEM; 782 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 783 if (IS_ERR(devname)) 784 err = PTR_ERR(devname); 785 else 786 seq_escape(m, devname, " \t\n\\"); 787 free_page((unsigned long)page); 788 return err; 789 } 790 EXPORT_SYMBOL_GPL(nfs_show_devname); 791 792 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 793 { 794 seq_puts(m, "/"); 795 return 0; 796 } 797 EXPORT_SYMBOL_GPL(nfs_show_path); 798 799 /* 800 * Present statistical information for this VFS mountpoint 801 */ 802 int nfs_show_stats(struct seq_file *m, struct dentry *root) 803 { 804 int i, cpu; 805 struct nfs_server *nfss = NFS_SB(root->d_sb); 806 struct rpc_auth *auth = nfss->client->cl_auth; 807 struct nfs_iostats totals = { }; 808 809 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 810 811 /* 812 * Display all mount option settings 813 */ 814 seq_printf(m, "\n\topts:\t"); 815 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 816 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 817 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 818 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 819 nfs_show_mount_options(m, nfss, 1); 820 821 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 822 823 show_implementation_id(m, nfss); 824 825 seq_printf(m, "\n\tcaps:\t"); 826 seq_printf(m, "caps=0x%x", nfss->caps); 827 seq_printf(m, ",wtmult=%u", nfss->wtmult); 828 seq_printf(m, ",dtsize=%u", nfss->dtsize); 829 seq_printf(m, ",bsize=%u", nfss->bsize); 830 seq_printf(m, ",namlen=%u", nfss->namelen); 831 832 #if IS_ENABLED(CONFIG_NFS_V4) 833 if (nfss->nfs_client->rpc_ops->version == 4) { 834 seq_printf(m, "\n\tnfsv4:\t"); 835 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 836 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 837 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 838 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 839 show_sessions(m, nfss); 840 show_pnfs(m, nfss); 841 } 842 #endif 843 844 /* 845 * Display security flavor in effect for this mount 846 */ 847 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 848 if (auth->au_flavor) 849 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 850 851 /* 852 * Display superblock I/O counters 853 */ 854 for_each_possible_cpu(cpu) { 855 struct nfs_iostats *stats; 856 857 preempt_disable(); 858 stats = per_cpu_ptr(nfss->io_stats, cpu); 859 860 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 861 totals.events[i] += stats->events[i]; 862 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 863 totals.bytes[i] += stats->bytes[i]; 864 #ifdef CONFIG_NFS_FSCACHE 865 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 866 totals.fscache[i] += stats->fscache[i]; 867 #endif 868 869 preempt_enable(); 870 } 871 872 seq_printf(m, "\n\tevents:\t"); 873 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 874 seq_printf(m, "%lu ", totals.events[i]); 875 seq_printf(m, "\n\tbytes:\t"); 876 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 877 seq_printf(m, "%Lu ", totals.bytes[i]); 878 #ifdef CONFIG_NFS_FSCACHE 879 if (nfss->options & NFS_OPTION_FSCACHE) { 880 seq_printf(m, "\n\tfsc:\t"); 881 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 882 seq_printf(m, "%Lu ", totals.bytes[i]); 883 } 884 #endif 885 seq_printf(m, "\n"); 886 887 rpc_print_iostats(m, nfss->client); 888 889 return 0; 890 } 891 EXPORT_SYMBOL_GPL(nfs_show_stats); 892 893 /* 894 * Begin unmount by attempting to remove all automounted mountpoints we added 895 * in response to xdev traversals and referrals 896 */ 897 void nfs_umount_begin(struct super_block *sb) 898 { 899 struct nfs_server *server; 900 struct rpc_clnt *rpc; 901 902 server = NFS_SB(sb); 903 /* -EIO all pending I/O */ 904 rpc = server->client_acl; 905 if (!IS_ERR(rpc)) 906 rpc_killall_tasks(rpc); 907 rpc = server->client; 908 if (!IS_ERR(rpc)) 909 rpc_killall_tasks(rpc); 910 } 911 EXPORT_SYMBOL_GPL(nfs_umount_begin); 912 913 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 914 { 915 struct nfs_parsed_mount_data *data; 916 917 data = kzalloc(sizeof(*data), GFP_KERNEL); 918 if (data) { 919 data->acregmin = NFS_DEF_ACREGMIN; 920 data->acregmax = NFS_DEF_ACREGMAX; 921 data->acdirmin = NFS_DEF_ACDIRMIN; 922 data->acdirmax = NFS_DEF_ACDIRMAX; 923 data->mount_server.port = NFS_UNSPEC_PORT; 924 data->nfs_server.port = NFS_UNSPEC_PORT; 925 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 926 data->auth_flavors[0] = RPC_AUTH_MAXFLAVOR; 927 data->auth_flavor_len = 0; 928 data->minorversion = 0; 929 data->need_mount = true; 930 data->net = current->nsproxy->net_ns; 931 security_init_mnt_opts(&data->lsm_opts); 932 } 933 return data; 934 } 935 936 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 937 { 938 if (data) { 939 kfree(data->client_address); 940 kfree(data->mount_server.hostname); 941 kfree(data->nfs_server.export_path); 942 kfree(data->nfs_server.hostname); 943 kfree(data->fscache_uniq); 944 security_free_mnt_opts(&data->lsm_opts); 945 kfree(data); 946 } 947 } 948 949 /* 950 * Sanity-check a server address provided by the mount command. 951 * 952 * Address family must be initialized, and address must not be 953 * the ANY address for that family. 954 */ 955 static int nfs_verify_server_address(struct sockaddr *addr) 956 { 957 switch (addr->sa_family) { 958 case AF_INET: { 959 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 960 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 961 } 962 case AF_INET6: { 963 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 964 return !ipv6_addr_any(sa); 965 } 966 } 967 968 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 969 return 0; 970 } 971 972 /* 973 * Select between a default port value and a user-specified port value. 974 * If a zero value is set, then autobind will be used. 975 */ 976 static void nfs_set_port(struct sockaddr *sap, int *port, 977 const unsigned short default_port) 978 { 979 if (*port == NFS_UNSPEC_PORT) 980 *port = default_port; 981 982 rpc_set_port(sap, *port); 983 } 984 985 /* 986 * Sanity check the NFS transport protocol. 987 * 988 */ 989 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 990 { 991 switch (mnt->nfs_server.protocol) { 992 case XPRT_TRANSPORT_UDP: 993 case XPRT_TRANSPORT_TCP: 994 case XPRT_TRANSPORT_RDMA: 995 break; 996 default: 997 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 998 } 999 } 1000 1001 /* 1002 * For text based NFSv2/v3 mounts, the mount protocol transport default 1003 * settings should depend upon the specified NFS transport. 1004 */ 1005 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1006 { 1007 nfs_validate_transport_protocol(mnt); 1008 1009 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1010 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1011 return; 1012 switch (mnt->nfs_server.protocol) { 1013 case XPRT_TRANSPORT_UDP: 1014 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1015 break; 1016 case XPRT_TRANSPORT_TCP: 1017 case XPRT_TRANSPORT_RDMA: 1018 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1019 } 1020 } 1021 1022 static void nfs_set_auth_parsed_mount_data(struct nfs_parsed_mount_data *data, 1023 rpc_authflavor_t pseudoflavor) 1024 { 1025 data->auth_flavors[0] = pseudoflavor; 1026 data->auth_flavor_len = 1; 1027 } 1028 1029 /* 1030 * Parse the value of the 'sec=' option. 1031 */ 1032 static int nfs_parse_security_flavors(char *value, 1033 struct nfs_parsed_mount_data *mnt) 1034 { 1035 substring_t args[MAX_OPT_ARGS]; 1036 rpc_authflavor_t pseudoflavor; 1037 1038 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1039 1040 switch (match_token(value, nfs_secflavor_tokens, args)) { 1041 case Opt_sec_none: 1042 pseudoflavor = RPC_AUTH_NULL; 1043 break; 1044 case Opt_sec_sys: 1045 pseudoflavor = RPC_AUTH_UNIX; 1046 break; 1047 case Opt_sec_krb5: 1048 pseudoflavor = RPC_AUTH_GSS_KRB5; 1049 break; 1050 case Opt_sec_krb5i: 1051 pseudoflavor = RPC_AUTH_GSS_KRB5I; 1052 break; 1053 case Opt_sec_krb5p: 1054 pseudoflavor = RPC_AUTH_GSS_KRB5P; 1055 break; 1056 case Opt_sec_lkey: 1057 pseudoflavor = RPC_AUTH_GSS_LKEY; 1058 break; 1059 case Opt_sec_lkeyi: 1060 pseudoflavor = RPC_AUTH_GSS_LKEYI; 1061 break; 1062 case Opt_sec_lkeyp: 1063 pseudoflavor = RPC_AUTH_GSS_LKEYP; 1064 break; 1065 case Opt_sec_spkm: 1066 pseudoflavor = RPC_AUTH_GSS_SPKM; 1067 break; 1068 case Opt_sec_spkmi: 1069 pseudoflavor = RPC_AUTH_GSS_SPKMI; 1070 break; 1071 case Opt_sec_spkmp: 1072 pseudoflavor = RPC_AUTH_GSS_SPKMP; 1073 break; 1074 default: 1075 return 0; 1076 } 1077 1078 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 1079 nfs_set_auth_parsed_mount_data(mnt, pseudoflavor); 1080 return 1; 1081 } 1082 1083 static int nfs_parse_version_string(char *string, 1084 struct nfs_parsed_mount_data *mnt, 1085 substring_t *args) 1086 { 1087 mnt->flags &= ~NFS_MOUNT_VER3; 1088 switch (match_token(string, nfs_vers_tokens, args)) { 1089 case Opt_vers_2: 1090 mnt->version = 2; 1091 break; 1092 case Opt_vers_3: 1093 mnt->flags |= NFS_MOUNT_VER3; 1094 mnt->version = 3; 1095 break; 1096 case Opt_vers_4: 1097 /* Backward compatibility option. In future, 1098 * the mount program should always supply 1099 * a NFSv4 minor version number. 1100 */ 1101 mnt->version = 4; 1102 break; 1103 case Opt_vers_4_0: 1104 mnt->version = 4; 1105 mnt->minorversion = 0; 1106 break; 1107 case Opt_vers_4_1: 1108 mnt->version = 4; 1109 mnt->minorversion = 1; 1110 break; 1111 case Opt_vers_4_2: 1112 mnt->version = 4; 1113 mnt->minorversion = 2; 1114 break; 1115 default: 1116 return 0; 1117 } 1118 return 1; 1119 } 1120 1121 static int nfs_get_option_str(substring_t args[], char **option) 1122 { 1123 kfree(*option); 1124 *option = match_strdup(args); 1125 return !*option; 1126 } 1127 1128 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1129 { 1130 int rc; 1131 char *string; 1132 1133 string = match_strdup(args); 1134 if (string == NULL) 1135 return -ENOMEM; 1136 rc = kstrtoul(string, 10, option); 1137 kfree(string); 1138 1139 return rc; 1140 } 1141 1142 /* 1143 * Error-check and convert a string of mount options from user space into 1144 * a data structure. The whole mount string is processed; bad options are 1145 * skipped as they are encountered. If there were no errors, return 1; 1146 * otherwise return 0 (zero). 1147 */ 1148 static int nfs_parse_mount_options(char *raw, 1149 struct nfs_parsed_mount_data *mnt) 1150 { 1151 char *p, *string, *secdata; 1152 int rc, sloppy = 0, invalid_option = 0; 1153 unsigned short protofamily = AF_UNSPEC; 1154 unsigned short mountfamily = AF_UNSPEC; 1155 1156 if (!raw) { 1157 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1158 return 1; 1159 } 1160 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1161 1162 secdata = alloc_secdata(); 1163 if (!secdata) 1164 goto out_nomem; 1165 1166 rc = security_sb_copy_data(raw, secdata); 1167 if (rc) 1168 goto out_security_failure; 1169 1170 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1171 if (rc) 1172 goto out_security_failure; 1173 1174 free_secdata(secdata); 1175 1176 while ((p = strsep(&raw, ",")) != NULL) { 1177 substring_t args[MAX_OPT_ARGS]; 1178 unsigned long option; 1179 int token; 1180 1181 if (!*p) 1182 continue; 1183 1184 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1185 1186 token = match_token(p, nfs_mount_option_tokens, args); 1187 switch (token) { 1188 1189 /* 1190 * boolean options: foo/nofoo 1191 */ 1192 case Opt_soft: 1193 mnt->flags |= NFS_MOUNT_SOFT; 1194 break; 1195 case Opt_hard: 1196 mnt->flags &= ~NFS_MOUNT_SOFT; 1197 break; 1198 case Opt_posix: 1199 mnt->flags |= NFS_MOUNT_POSIX; 1200 break; 1201 case Opt_noposix: 1202 mnt->flags &= ~NFS_MOUNT_POSIX; 1203 break; 1204 case Opt_cto: 1205 mnt->flags &= ~NFS_MOUNT_NOCTO; 1206 break; 1207 case Opt_nocto: 1208 mnt->flags |= NFS_MOUNT_NOCTO; 1209 break; 1210 case Opt_ac: 1211 mnt->flags &= ~NFS_MOUNT_NOAC; 1212 break; 1213 case Opt_noac: 1214 mnt->flags |= NFS_MOUNT_NOAC; 1215 break; 1216 case Opt_lock: 1217 mnt->flags &= ~NFS_MOUNT_NONLM; 1218 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1219 NFS_MOUNT_LOCAL_FCNTL); 1220 break; 1221 case Opt_nolock: 1222 mnt->flags |= NFS_MOUNT_NONLM; 1223 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1224 NFS_MOUNT_LOCAL_FCNTL); 1225 break; 1226 case Opt_udp: 1227 mnt->flags &= ~NFS_MOUNT_TCP; 1228 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1229 break; 1230 case Opt_tcp: 1231 mnt->flags |= NFS_MOUNT_TCP; 1232 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1233 break; 1234 case Opt_rdma: 1235 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1236 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1237 xprt_load_transport(p); 1238 break; 1239 case Opt_acl: 1240 mnt->flags &= ~NFS_MOUNT_NOACL; 1241 break; 1242 case Opt_noacl: 1243 mnt->flags |= NFS_MOUNT_NOACL; 1244 break; 1245 case Opt_rdirplus: 1246 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1247 break; 1248 case Opt_nordirplus: 1249 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1250 break; 1251 case Opt_sharecache: 1252 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1253 break; 1254 case Opt_nosharecache: 1255 mnt->flags |= NFS_MOUNT_UNSHARED; 1256 break; 1257 case Opt_resvport: 1258 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1259 break; 1260 case Opt_noresvport: 1261 mnt->flags |= NFS_MOUNT_NORESVPORT; 1262 break; 1263 case Opt_fscache: 1264 mnt->options |= NFS_OPTION_FSCACHE; 1265 kfree(mnt->fscache_uniq); 1266 mnt->fscache_uniq = NULL; 1267 break; 1268 case Opt_nofscache: 1269 mnt->options &= ~NFS_OPTION_FSCACHE; 1270 kfree(mnt->fscache_uniq); 1271 mnt->fscache_uniq = NULL; 1272 break; 1273 case Opt_migration: 1274 mnt->options |= NFS_OPTION_MIGRATION; 1275 break; 1276 case Opt_nomigration: 1277 mnt->options &= NFS_OPTION_MIGRATION; 1278 break; 1279 1280 /* 1281 * options that take numeric values 1282 */ 1283 case Opt_port: 1284 if (nfs_get_option_ul(args, &option) || 1285 option > USHRT_MAX) 1286 goto out_invalid_value; 1287 mnt->nfs_server.port = option; 1288 break; 1289 case Opt_rsize: 1290 if (nfs_get_option_ul(args, &option)) 1291 goto out_invalid_value; 1292 mnt->rsize = option; 1293 break; 1294 case Opt_wsize: 1295 if (nfs_get_option_ul(args, &option)) 1296 goto out_invalid_value; 1297 mnt->wsize = option; 1298 break; 1299 case Opt_bsize: 1300 if (nfs_get_option_ul(args, &option)) 1301 goto out_invalid_value; 1302 mnt->bsize = option; 1303 break; 1304 case Opt_timeo: 1305 if (nfs_get_option_ul(args, &option) || option == 0) 1306 goto out_invalid_value; 1307 mnt->timeo = option; 1308 break; 1309 case Opt_retrans: 1310 if (nfs_get_option_ul(args, &option) || option == 0) 1311 goto out_invalid_value; 1312 mnt->retrans = option; 1313 break; 1314 case Opt_acregmin: 1315 if (nfs_get_option_ul(args, &option)) 1316 goto out_invalid_value; 1317 mnt->acregmin = option; 1318 break; 1319 case Opt_acregmax: 1320 if (nfs_get_option_ul(args, &option)) 1321 goto out_invalid_value; 1322 mnt->acregmax = option; 1323 break; 1324 case Opt_acdirmin: 1325 if (nfs_get_option_ul(args, &option)) 1326 goto out_invalid_value; 1327 mnt->acdirmin = option; 1328 break; 1329 case Opt_acdirmax: 1330 if (nfs_get_option_ul(args, &option)) 1331 goto out_invalid_value; 1332 mnt->acdirmax = option; 1333 break; 1334 case Opt_actimeo: 1335 if (nfs_get_option_ul(args, &option)) 1336 goto out_invalid_value; 1337 mnt->acregmin = mnt->acregmax = 1338 mnt->acdirmin = mnt->acdirmax = option; 1339 break; 1340 case Opt_namelen: 1341 if (nfs_get_option_ul(args, &option)) 1342 goto out_invalid_value; 1343 mnt->namlen = option; 1344 break; 1345 case Opt_mountport: 1346 if (nfs_get_option_ul(args, &option) || 1347 option > USHRT_MAX) 1348 goto out_invalid_value; 1349 mnt->mount_server.port = option; 1350 break; 1351 case Opt_mountvers: 1352 if (nfs_get_option_ul(args, &option) || 1353 option < NFS_MNT_VERSION || 1354 option > NFS_MNT3_VERSION) 1355 goto out_invalid_value; 1356 mnt->mount_server.version = option; 1357 break; 1358 case Opt_minorversion: 1359 if (nfs_get_option_ul(args, &option)) 1360 goto out_invalid_value; 1361 if (option > NFS4_MAX_MINOR_VERSION) 1362 goto out_invalid_value; 1363 mnt->minorversion = option; 1364 break; 1365 1366 /* 1367 * options that take text values 1368 */ 1369 case Opt_nfsvers: 1370 string = match_strdup(args); 1371 if (string == NULL) 1372 goto out_nomem; 1373 rc = nfs_parse_version_string(string, mnt, args); 1374 kfree(string); 1375 if (!rc) 1376 goto out_invalid_value; 1377 break; 1378 case Opt_sec: 1379 string = match_strdup(args); 1380 if (string == NULL) 1381 goto out_nomem; 1382 rc = nfs_parse_security_flavors(string, mnt); 1383 kfree(string); 1384 if (!rc) { 1385 dfprintk(MOUNT, "NFS: unrecognized " 1386 "security flavor\n"); 1387 return 0; 1388 } 1389 break; 1390 case Opt_proto: 1391 string = match_strdup(args); 1392 if (string == NULL) 1393 goto out_nomem; 1394 token = match_token(string, 1395 nfs_xprt_protocol_tokens, args); 1396 1397 protofamily = AF_INET; 1398 switch (token) { 1399 case Opt_xprt_udp6: 1400 protofamily = AF_INET6; 1401 case Opt_xprt_udp: 1402 mnt->flags &= ~NFS_MOUNT_TCP; 1403 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1404 break; 1405 case Opt_xprt_tcp6: 1406 protofamily = AF_INET6; 1407 case Opt_xprt_tcp: 1408 mnt->flags |= NFS_MOUNT_TCP; 1409 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1410 break; 1411 case Opt_xprt_rdma: 1412 /* vector side protocols to TCP */ 1413 mnt->flags |= NFS_MOUNT_TCP; 1414 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1415 xprt_load_transport(string); 1416 break; 1417 default: 1418 dfprintk(MOUNT, "NFS: unrecognized " 1419 "transport protocol\n"); 1420 kfree(string); 1421 return 0; 1422 } 1423 kfree(string); 1424 break; 1425 case Opt_mountproto: 1426 string = match_strdup(args); 1427 if (string == NULL) 1428 goto out_nomem; 1429 token = match_token(string, 1430 nfs_xprt_protocol_tokens, args); 1431 kfree(string); 1432 1433 mountfamily = AF_INET; 1434 switch (token) { 1435 case Opt_xprt_udp6: 1436 mountfamily = AF_INET6; 1437 case Opt_xprt_udp: 1438 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1439 break; 1440 case Opt_xprt_tcp6: 1441 mountfamily = AF_INET6; 1442 case Opt_xprt_tcp: 1443 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1444 break; 1445 case Opt_xprt_rdma: /* not used for side protocols */ 1446 default: 1447 dfprintk(MOUNT, "NFS: unrecognized " 1448 "transport protocol\n"); 1449 return 0; 1450 } 1451 break; 1452 case Opt_addr: 1453 string = match_strdup(args); 1454 if (string == NULL) 1455 goto out_nomem; 1456 mnt->nfs_server.addrlen = 1457 rpc_pton(mnt->net, string, strlen(string), 1458 (struct sockaddr *) 1459 &mnt->nfs_server.address, 1460 sizeof(mnt->nfs_server.address)); 1461 kfree(string); 1462 if (mnt->nfs_server.addrlen == 0) 1463 goto out_invalid_address; 1464 break; 1465 case Opt_clientaddr: 1466 if (nfs_get_option_str(args, &mnt->client_address)) 1467 goto out_nomem; 1468 break; 1469 case Opt_mounthost: 1470 if (nfs_get_option_str(args, 1471 &mnt->mount_server.hostname)) 1472 goto out_nomem; 1473 break; 1474 case Opt_mountaddr: 1475 string = match_strdup(args); 1476 if (string == NULL) 1477 goto out_nomem; 1478 mnt->mount_server.addrlen = 1479 rpc_pton(mnt->net, string, strlen(string), 1480 (struct sockaddr *) 1481 &mnt->mount_server.address, 1482 sizeof(mnt->mount_server.address)); 1483 kfree(string); 1484 if (mnt->mount_server.addrlen == 0) 1485 goto out_invalid_address; 1486 break; 1487 case Opt_lookupcache: 1488 string = match_strdup(args); 1489 if (string == NULL) 1490 goto out_nomem; 1491 token = match_token(string, 1492 nfs_lookupcache_tokens, args); 1493 kfree(string); 1494 switch (token) { 1495 case Opt_lookupcache_all: 1496 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1497 break; 1498 case Opt_lookupcache_positive: 1499 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1500 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1501 break; 1502 case Opt_lookupcache_none: 1503 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1504 break; 1505 default: 1506 dfprintk(MOUNT, "NFS: invalid " 1507 "lookupcache argument\n"); 1508 return 0; 1509 }; 1510 break; 1511 case Opt_fscache_uniq: 1512 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1513 goto out_nomem; 1514 mnt->options |= NFS_OPTION_FSCACHE; 1515 break; 1516 case Opt_local_lock: 1517 string = match_strdup(args); 1518 if (string == NULL) 1519 goto out_nomem; 1520 token = match_token(string, nfs_local_lock_tokens, 1521 args); 1522 kfree(string); 1523 switch (token) { 1524 case Opt_local_lock_all: 1525 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1526 NFS_MOUNT_LOCAL_FCNTL); 1527 break; 1528 case Opt_local_lock_flock: 1529 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1530 break; 1531 case Opt_local_lock_posix: 1532 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1533 break; 1534 case Opt_local_lock_none: 1535 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1536 NFS_MOUNT_LOCAL_FCNTL); 1537 break; 1538 default: 1539 dfprintk(MOUNT, "NFS: invalid " 1540 "local_lock argument\n"); 1541 return 0; 1542 }; 1543 break; 1544 1545 /* 1546 * Special options 1547 */ 1548 case Opt_sloppy: 1549 sloppy = 1; 1550 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1551 break; 1552 case Opt_userspace: 1553 case Opt_deprecated: 1554 dfprintk(MOUNT, "NFS: ignoring mount option " 1555 "'%s'\n", p); 1556 break; 1557 1558 default: 1559 invalid_option = 1; 1560 dfprintk(MOUNT, "NFS: unrecognized mount option " 1561 "'%s'\n", p); 1562 } 1563 } 1564 1565 if (!sloppy && invalid_option) 1566 return 0; 1567 1568 if (mnt->minorversion && mnt->version != 4) 1569 goto out_minorversion_mismatch; 1570 1571 if (mnt->options & NFS_OPTION_MIGRATION && 1572 mnt->version != 4 && mnt->minorversion != 0) 1573 goto out_migration_misuse; 1574 1575 /* 1576 * verify that any proto=/mountproto= options match the address 1577 * families in the addr=/mountaddr= options. 1578 */ 1579 if (protofamily != AF_UNSPEC && 1580 protofamily != mnt->nfs_server.address.ss_family) 1581 goto out_proto_mismatch; 1582 1583 if (mountfamily != AF_UNSPEC) { 1584 if (mnt->mount_server.addrlen) { 1585 if (mountfamily != mnt->mount_server.address.ss_family) 1586 goto out_mountproto_mismatch; 1587 } else { 1588 if (mountfamily != mnt->nfs_server.address.ss_family) 1589 goto out_mountproto_mismatch; 1590 } 1591 } 1592 1593 return 1; 1594 1595 out_mountproto_mismatch: 1596 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1597 "option\n"); 1598 return 0; 1599 out_proto_mismatch: 1600 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1601 return 0; 1602 out_invalid_address: 1603 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1604 return 0; 1605 out_invalid_value: 1606 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1607 return 0; 1608 out_minorversion_mismatch: 1609 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1610 "minorversion=%u\n", mnt->version, mnt->minorversion); 1611 return 0; 1612 out_migration_misuse: 1613 printk(KERN_INFO 1614 "NFS: 'migration' not supported for this NFS version\n"); 1615 return 0; 1616 out_nomem: 1617 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1618 return 0; 1619 out_security_failure: 1620 free_secdata(secdata); 1621 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1622 return 0; 1623 } 1624 1625 /* 1626 * Ensure that the specified authtype in args->auth_flavors[0] is supported by 1627 * the server. Returns 0 if it's ok, and -EACCES if not. 1628 */ 1629 static int nfs_verify_authflavor(struct nfs_parsed_mount_data *args, 1630 rpc_authflavor_t *server_authlist, unsigned int count) 1631 { 1632 unsigned int i; 1633 1634 /* 1635 * If the sec= mount option is used, the specified flavor or AUTH_NULL 1636 * must be in the list returned by the server. 1637 * 1638 * AUTH_NULL has a special meaning when it's in the server list - it 1639 * means that the server will ignore the rpc creds, so any flavor 1640 * can be used. 1641 */ 1642 for (i = 0; i < count; i++) { 1643 if (args->auth_flavors[0] == server_authlist[i] || 1644 server_authlist[i] == RPC_AUTH_NULL) 1645 goto out; 1646 } 1647 1648 dfprintk(MOUNT, "NFS: auth flavor %u not supported by server\n", 1649 args->auth_flavors[0]); 1650 return -EACCES; 1651 1652 out: 1653 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]); 1654 return 0; 1655 } 1656 1657 /* 1658 * Use the remote server's MOUNT service to request the NFS file handle 1659 * corresponding to the provided path. 1660 */ 1661 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1662 struct nfs_fh *root_fh, 1663 rpc_authflavor_t *server_authlist, 1664 unsigned int *server_authlist_len) 1665 { 1666 struct nfs_mount_request request = { 1667 .sap = (struct sockaddr *) 1668 &args->mount_server.address, 1669 .dirpath = args->nfs_server.export_path, 1670 .protocol = args->mount_server.protocol, 1671 .fh = root_fh, 1672 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1673 .auth_flav_len = server_authlist_len, 1674 .auth_flavs = server_authlist, 1675 .net = args->net, 1676 }; 1677 int status; 1678 1679 if (args->mount_server.version == 0) { 1680 switch (args->version) { 1681 default: 1682 args->mount_server.version = NFS_MNT3_VERSION; 1683 break; 1684 case 2: 1685 args->mount_server.version = NFS_MNT_VERSION; 1686 } 1687 } 1688 request.version = args->mount_server.version; 1689 1690 if (args->mount_server.hostname) 1691 request.hostname = args->mount_server.hostname; 1692 else 1693 request.hostname = args->nfs_server.hostname; 1694 1695 /* 1696 * Construct the mount server's address. 1697 */ 1698 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1699 memcpy(request.sap, &args->nfs_server.address, 1700 args->nfs_server.addrlen); 1701 args->mount_server.addrlen = args->nfs_server.addrlen; 1702 } 1703 request.salen = args->mount_server.addrlen; 1704 nfs_set_port(request.sap, &args->mount_server.port, 0); 1705 1706 /* 1707 * Now ask the mount server to map our export path 1708 * to a file handle. 1709 */ 1710 status = nfs_mount(&request); 1711 if (status != 0) { 1712 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1713 request.hostname, status); 1714 return status; 1715 } 1716 1717 return 0; 1718 } 1719 1720 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, 1721 struct nfs_subversion *nfs_mod) 1722 { 1723 int status; 1724 unsigned int i; 1725 bool tried_auth_unix = false; 1726 bool auth_null_in_list = false; 1727 struct nfs_server *server = ERR_PTR(-EACCES); 1728 struct nfs_parsed_mount_data *args = mount_info->parsed; 1729 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 1730 unsigned int authlist_len = ARRAY_SIZE(authlist); 1731 1732 status = nfs_request_mount(args, mount_info->mntfh, authlist, 1733 &authlist_len); 1734 if (status) 1735 return ERR_PTR(status); 1736 1737 /* 1738 * Was a sec= authflavor specified in the options? First, verify 1739 * whether the server supports it, and then just try to use it if so. 1740 */ 1741 if (args->auth_flavor_len > 0) { 1742 status = nfs_verify_authflavor(args, authlist, authlist_len); 1743 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]); 1744 if (status) 1745 return ERR_PTR(status); 1746 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1747 } 1748 1749 /* 1750 * No sec= option was provided. RFC 2623, section 2.7 suggests we 1751 * SHOULD prefer the flavor listed first. However, some servers list 1752 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 1753 */ 1754 for (i = 0; i < authlist_len; ++i) { 1755 rpc_authflavor_t flavor; 1756 struct rpcsec_gss_info info; 1757 1758 flavor = authlist[i]; 1759 switch (flavor) { 1760 case RPC_AUTH_UNIX: 1761 tried_auth_unix = true; 1762 break; 1763 case RPC_AUTH_NULL: 1764 auth_null_in_list = true; 1765 continue; 1766 default: 1767 if (rpcauth_get_gssinfo(flavor, &info) != 0) 1768 continue; 1769 /* Fallthrough */ 1770 } 1771 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 1772 nfs_set_auth_parsed_mount_data(args, flavor); 1773 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1774 if (!IS_ERR(server)) 1775 return server; 1776 } 1777 1778 /* 1779 * Nothing we tried so far worked. At this point, give up if we've 1780 * already tried AUTH_UNIX or if the server's list doesn't contain 1781 * AUTH_NULL 1782 */ 1783 if (tried_auth_unix || !auth_null_in_list) 1784 return server; 1785 1786 /* Last chance! Try AUTH_UNIX */ 1787 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 1788 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX); 1789 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1790 } 1791 1792 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1793 struct nfs_mount_info *mount_info, 1794 struct nfs_subversion *nfs_mod) 1795 { 1796 struct nfs_server *server; 1797 1798 if (mount_info->parsed->need_mount) 1799 server = nfs_try_mount_request(mount_info, nfs_mod); 1800 else 1801 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1802 1803 if (IS_ERR(server)) 1804 return ERR_CAST(server); 1805 1806 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1807 } 1808 EXPORT_SYMBOL_GPL(nfs_try_mount); 1809 1810 /* 1811 * Split "dev_name" into "hostname:export_path". 1812 * 1813 * The leftmost colon demarks the split between the server's hostname 1814 * and the export path. If the hostname starts with a left square 1815 * bracket, then it may contain colons. 1816 * 1817 * Note: caller frees hostname and export path, even on error. 1818 */ 1819 static int nfs_parse_devname(const char *dev_name, 1820 char **hostname, size_t maxnamlen, 1821 char **export_path, size_t maxpathlen) 1822 { 1823 size_t len; 1824 char *end; 1825 1826 /* Is the host name protected with square brakcets? */ 1827 if (*dev_name == '[') { 1828 end = strchr(++dev_name, ']'); 1829 if (end == NULL || end[1] != ':') 1830 goto out_bad_devname; 1831 1832 len = end - dev_name; 1833 end++; 1834 } else { 1835 char *comma; 1836 1837 end = strchr(dev_name, ':'); 1838 if (end == NULL) 1839 goto out_bad_devname; 1840 len = end - dev_name; 1841 1842 /* kill possible hostname list: not supported */ 1843 comma = strchr(dev_name, ','); 1844 if (comma != NULL && comma < end) 1845 *comma = 0; 1846 } 1847 1848 if (len > maxnamlen) 1849 goto out_hostname; 1850 1851 /* N.B. caller will free nfs_server.hostname in all cases */ 1852 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1853 if (*hostname == NULL) 1854 goto out_nomem; 1855 len = strlen(++end); 1856 if (len > maxpathlen) 1857 goto out_path; 1858 *export_path = kstrndup(end, len, GFP_KERNEL); 1859 if (!*export_path) 1860 goto out_nomem; 1861 1862 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1863 return 0; 1864 1865 out_bad_devname: 1866 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1867 return -EINVAL; 1868 1869 out_nomem: 1870 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1871 return -ENOMEM; 1872 1873 out_hostname: 1874 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1875 return -ENAMETOOLONG; 1876 1877 out_path: 1878 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1879 return -ENAMETOOLONG; 1880 } 1881 1882 /* 1883 * Validate the NFS2/NFS3 mount data 1884 * - fills in the mount root filehandle 1885 * 1886 * For option strings, user space handles the following behaviors: 1887 * 1888 * + DNS: mapping server host name to IP address ("addr=" option) 1889 * 1890 * + failure mode: how to behave if a mount request can't be handled 1891 * immediately ("fg/bg" option) 1892 * 1893 * + retry: how often to retry a mount request ("retry=" option) 1894 * 1895 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1896 * mountproto=tcp after mountproto=udp, and so on 1897 */ 1898 static int nfs23_validate_mount_data(void *options, 1899 struct nfs_parsed_mount_data *args, 1900 struct nfs_fh *mntfh, 1901 const char *dev_name) 1902 { 1903 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1904 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1905 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; 1906 1907 if (data == NULL) 1908 goto out_no_data; 1909 1910 args->version = NFS_DEFAULT_VERSION; 1911 switch (data->version) { 1912 case 1: 1913 data->namlen = 0; 1914 case 2: 1915 data->bsize = 0; 1916 case 3: 1917 if (data->flags & NFS_MOUNT_VER3) 1918 goto out_no_v3; 1919 data->root.size = NFS2_FHSIZE; 1920 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1921 /* Turn off security negotiation */ 1922 extra_flags |= NFS_MOUNT_SECFLAVOUR; 1923 case 4: 1924 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1925 goto out_no_sec; 1926 case 5: 1927 memset(data->context, 0, sizeof(data->context)); 1928 case 6: 1929 if (data->flags & NFS_MOUNT_VER3) { 1930 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1931 goto out_invalid_fh; 1932 mntfh->size = data->root.size; 1933 args->version = 3; 1934 } else { 1935 mntfh->size = NFS2_FHSIZE; 1936 args->version = 2; 1937 } 1938 1939 1940 memcpy(mntfh->data, data->root.data, mntfh->size); 1941 if (mntfh->size < sizeof(mntfh->data)) 1942 memset(mntfh->data + mntfh->size, 0, 1943 sizeof(mntfh->data) - mntfh->size); 1944 1945 /* 1946 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1947 * can deal with. 1948 */ 1949 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1950 args->flags |= extra_flags; 1951 args->rsize = data->rsize; 1952 args->wsize = data->wsize; 1953 args->timeo = data->timeo; 1954 args->retrans = data->retrans; 1955 args->acregmin = data->acregmin; 1956 args->acregmax = data->acregmax; 1957 args->acdirmin = data->acdirmin; 1958 args->acdirmax = data->acdirmax; 1959 args->need_mount = false; 1960 1961 memcpy(sap, &data->addr, sizeof(data->addr)); 1962 args->nfs_server.addrlen = sizeof(data->addr); 1963 args->nfs_server.port = ntohs(data->addr.sin_port); 1964 if (!nfs_verify_server_address(sap)) 1965 goto out_no_address; 1966 1967 if (!(data->flags & NFS_MOUNT_TCP)) 1968 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1969 /* N.B. caller will free nfs_server.hostname in all cases */ 1970 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1971 args->namlen = data->namlen; 1972 args->bsize = data->bsize; 1973 1974 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1975 nfs_set_auth_parsed_mount_data(args, data->pseudoflavor); 1976 else 1977 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX); 1978 if (!args->nfs_server.hostname) 1979 goto out_nomem; 1980 1981 if (!(data->flags & NFS_MOUNT_NONLM)) 1982 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1983 NFS_MOUNT_LOCAL_FCNTL); 1984 else 1985 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1986 NFS_MOUNT_LOCAL_FCNTL); 1987 /* 1988 * The legacy version 6 binary mount data from userspace has a 1989 * field used only to transport selinux information into the 1990 * the kernel. To continue to support that functionality we 1991 * have a touch of selinux knowledge here in the NFS code. The 1992 * userspace code converted context=blah to just blah so we are 1993 * converting back to the full string selinux understands. 1994 */ 1995 if (data->context[0]){ 1996 #ifdef CONFIG_SECURITY_SELINUX 1997 int rc; 1998 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1999 if (!opts_str) 2000 return -ENOMEM; 2001 strcpy(opts_str, "context="); 2002 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 2003 strcat(opts_str, &data->context[0]); 2004 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 2005 kfree(opts_str); 2006 if (rc) 2007 return rc; 2008 #else 2009 return -EINVAL; 2010 #endif 2011 } 2012 2013 break; 2014 default: 2015 return NFS_TEXT_DATA; 2016 } 2017 2018 #if !IS_ENABLED(CONFIG_NFS_V3) 2019 if (args->version == 3) 2020 goto out_v3_not_compiled; 2021 #endif /* !CONFIG_NFS_V3 */ 2022 2023 return 0; 2024 2025 out_no_data: 2026 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2027 return -EINVAL; 2028 2029 out_no_v3: 2030 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2031 data->version); 2032 return -EINVAL; 2033 2034 out_no_sec: 2035 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2036 return -EINVAL; 2037 2038 #if !IS_ENABLED(CONFIG_NFS_V3) 2039 out_v3_not_compiled: 2040 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 2041 return -EPROTONOSUPPORT; 2042 #endif /* !CONFIG_NFS_V3 */ 2043 2044 out_nomem: 2045 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2046 return -ENOMEM; 2047 2048 out_no_address: 2049 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2050 return -EINVAL; 2051 2052 out_invalid_fh: 2053 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2054 return -EINVAL; 2055 } 2056 2057 #if IS_ENABLED(CONFIG_NFS_V4) 2058 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2059 void *options, 2060 struct nfs_parsed_mount_data *args, 2061 struct nfs_fh *mntfh, 2062 const char *dev_name) 2063 { 2064 if (fs_type == &nfs_fs_type) 2065 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2066 return nfs4_validate_mount_data(options, args, dev_name); 2067 } 2068 #else 2069 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2070 void *options, 2071 struct nfs_parsed_mount_data *args, 2072 struct nfs_fh *mntfh, 2073 const char *dev_name) 2074 { 2075 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2076 } 2077 #endif 2078 2079 static int nfs_validate_text_mount_data(void *options, 2080 struct nfs_parsed_mount_data *args, 2081 const char *dev_name) 2082 { 2083 int port = 0; 2084 int max_namelen = PAGE_SIZE; 2085 int max_pathlen = NFS_MAXPATHLEN; 2086 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2087 2088 if (nfs_parse_mount_options((char *)options, args) == 0) 2089 return -EINVAL; 2090 2091 if (!nfs_verify_server_address(sap)) 2092 goto out_no_address; 2093 2094 if (args->version == 4) { 2095 #if IS_ENABLED(CONFIG_NFS_V4) 2096 port = NFS_PORT; 2097 max_namelen = NFS4_MAXNAMLEN; 2098 max_pathlen = NFS4_MAXPATHLEN; 2099 nfs_validate_transport_protocol(args); 2100 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2101 goto out_invalid_transport_udp; 2102 nfs4_validate_mount_flags(args); 2103 #else 2104 goto out_v4_not_compiled; 2105 #endif /* CONFIG_NFS_V4 */ 2106 } else 2107 nfs_set_mount_transport_protocol(args); 2108 2109 nfs_set_port(sap, &args->nfs_server.port, port); 2110 2111 if (args->auth_flavor_len > 1) 2112 goto out_bad_auth; 2113 2114 return nfs_parse_devname(dev_name, 2115 &args->nfs_server.hostname, 2116 max_namelen, 2117 &args->nfs_server.export_path, 2118 max_pathlen); 2119 2120 #if !IS_ENABLED(CONFIG_NFS_V4) 2121 out_v4_not_compiled: 2122 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2123 return -EPROTONOSUPPORT; 2124 #else 2125 out_invalid_transport_udp: 2126 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2127 return -EINVAL; 2128 #endif /* !CONFIG_NFS_V4 */ 2129 2130 out_no_address: 2131 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2132 return -EINVAL; 2133 2134 out_bad_auth: 2135 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n"); 2136 return -EINVAL; 2137 } 2138 2139 static int 2140 nfs_compare_remount_data(struct nfs_server *nfss, 2141 struct nfs_parsed_mount_data *data) 2142 { 2143 if (data->flags != nfss->flags || 2144 data->rsize != nfss->rsize || 2145 data->wsize != nfss->wsize || 2146 data->retrans != nfss->client->cl_timeout->to_retries || 2147 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2148 data->acregmin != nfss->acregmin / HZ || 2149 data->acregmax != nfss->acregmax / HZ || 2150 data->acdirmin != nfss->acdirmin / HZ || 2151 data->acdirmax != nfss->acdirmax / HZ || 2152 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2153 data->nfs_server.port != nfss->port || 2154 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2155 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2156 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2157 return -EINVAL; 2158 2159 return 0; 2160 } 2161 2162 int 2163 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2164 { 2165 int error; 2166 struct nfs_server *nfss = sb->s_fs_info; 2167 struct nfs_parsed_mount_data *data; 2168 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2169 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2170 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2171 2172 /* 2173 * Userspace mount programs that send binary options generally send 2174 * them populated with default values. We have no way to know which 2175 * ones were explicitly specified. Fall back to legacy behavior and 2176 * just return success. 2177 */ 2178 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2179 (nfsvers <= 3 && (!options || (options->version >= 1 && 2180 options->version <= 6)))) 2181 return 0; 2182 2183 data = kzalloc(sizeof(*data), GFP_KERNEL); 2184 if (data == NULL) 2185 return -ENOMEM; 2186 2187 /* fill out struct with values from existing mount */ 2188 data->flags = nfss->flags; 2189 data->rsize = nfss->rsize; 2190 data->wsize = nfss->wsize; 2191 data->retrans = nfss->client->cl_timeout->to_retries; 2192 nfs_set_auth_parsed_mount_data(data, nfss->client->cl_auth->au_flavor); 2193 data->acregmin = nfss->acregmin / HZ; 2194 data->acregmax = nfss->acregmax / HZ; 2195 data->acdirmin = nfss->acdirmin / HZ; 2196 data->acdirmax = nfss->acdirmax / HZ; 2197 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2198 data->nfs_server.port = nfss->port; 2199 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2200 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2201 data->nfs_server.addrlen); 2202 2203 /* overwrite those values with any that were specified */ 2204 error = nfs_parse_mount_options((char *)options, data); 2205 if (error < 0) 2206 goto out; 2207 2208 /* 2209 * noac is a special case. It implies -o sync, but that's not 2210 * necessarily reflected in the mtab options. do_remount_sb 2211 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2212 * remount options, so we have to explicitly reset it. 2213 */ 2214 if (data->flags & NFS_MOUNT_NOAC) 2215 *flags |= MS_SYNCHRONOUS; 2216 2217 /* compare new mount options with old ones */ 2218 error = nfs_compare_remount_data(nfss, data); 2219 out: 2220 kfree(data); 2221 return error; 2222 } 2223 EXPORT_SYMBOL_GPL(nfs_remount); 2224 2225 /* 2226 * Initialise the common bits of the superblock 2227 */ 2228 inline void nfs_initialise_sb(struct super_block *sb) 2229 { 2230 struct nfs_server *server = NFS_SB(sb); 2231 2232 sb->s_magic = NFS_SUPER_MAGIC; 2233 2234 /* We probably want something more informative here */ 2235 snprintf(sb->s_id, sizeof(sb->s_id), 2236 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2237 2238 if (sb->s_blocksize == 0) 2239 sb->s_blocksize = nfs_block_bits(server->wsize, 2240 &sb->s_blocksize_bits); 2241 2242 sb->s_bdi = &server->backing_dev_info; 2243 2244 nfs_super_set_maxbytes(sb, server->maxfilesize); 2245 } 2246 2247 /* 2248 * Finish setting up an NFS2/3 superblock 2249 */ 2250 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2251 { 2252 struct nfs_parsed_mount_data *data = mount_info->parsed; 2253 struct nfs_server *server = NFS_SB(sb); 2254 2255 sb->s_blocksize_bits = 0; 2256 sb->s_blocksize = 0; 2257 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2258 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2259 if (data && data->bsize) 2260 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2261 2262 if (server->nfs_client->rpc_ops->version != 2) { 2263 /* The VFS shouldn't apply the umask to mode bits. We will do 2264 * so ourselves when necessary. 2265 */ 2266 sb->s_flags |= MS_POSIXACL; 2267 sb->s_time_gran = 1; 2268 } 2269 2270 nfs_initialise_sb(sb); 2271 } 2272 EXPORT_SYMBOL_GPL(nfs_fill_super); 2273 2274 /* 2275 * Finish setting up a cloned NFS2/3/4 superblock 2276 */ 2277 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2278 { 2279 const struct super_block *old_sb = mount_info->cloned->sb; 2280 struct nfs_server *server = NFS_SB(sb); 2281 2282 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2283 sb->s_blocksize = old_sb->s_blocksize; 2284 sb->s_maxbytes = old_sb->s_maxbytes; 2285 sb->s_xattr = old_sb->s_xattr; 2286 sb->s_op = old_sb->s_op; 2287 sb->s_time_gran = 1; 2288 2289 if (server->nfs_client->rpc_ops->version != 2) { 2290 /* The VFS shouldn't apply the umask to mode bits. We will do 2291 * so ourselves when necessary. 2292 */ 2293 sb->s_flags |= MS_POSIXACL; 2294 } 2295 2296 nfs_initialise_sb(sb); 2297 } 2298 2299 #define NFS_MOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 2300 | NFS_MOUNT_SECURE \ 2301 | NFS_MOUNT_TCP \ 2302 | NFS_MOUNT_VER3 \ 2303 | NFS_MOUNT_KERBEROS \ 2304 | NFS_MOUNT_NONLM \ 2305 | NFS_MOUNT_BROKEN_SUID \ 2306 | NFS_MOUNT_STRICTLOCK \ 2307 | NFS_MOUNT_UNSHARED \ 2308 | NFS_MOUNT_NORESVPORT \ 2309 | NFS_MOUNT_LEGACY_INTERFACE) 2310 2311 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2312 { 2313 const struct nfs_server *a = s->s_fs_info; 2314 const struct rpc_clnt *clnt_a = a->client; 2315 const struct rpc_clnt *clnt_b = b->client; 2316 2317 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2318 goto Ebusy; 2319 if (a->nfs_client != b->nfs_client) 2320 goto Ebusy; 2321 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 2322 goto Ebusy; 2323 if (a->wsize != b->wsize) 2324 goto Ebusy; 2325 if (a->rsize != b->rsize) 2326 goto Ebusy; 2327 if (a->acregmin != b->acregmin) 2328 goto Ebusy; 2329 if (a->acregmax != b->acregmax) 2330 goto Ebusy; 2331 if (a->acdirmin != b->acdirmin) 2332 goto Ebusy; 2333 if (a->acdirmax != b->acdirmax) 2334 goto Ebusy; 2335 if (b->flags & NFS_MOUNT_SECFLAVOUR && 2336 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2337 goto Ebusy; 2338 return 1; 2339 Ebusy: 2340 return 0; 2341 } 2342 2343 struct nfs_sb_mountdata { 2344 struct nfs_server *server; 2345 int mntflags; 2346 }; 2347 2348 static int nfs_set_super(struct super_block *s, void *data) 2349 { 2350 struct nfs_sb_mountdata *sb_mntdata = data; 2351 struct nfs_server *server = sb_mntdata->server; 2352 int ret; 2353 2354 s->s_flags = sb_mntdata->mntflags; 2355 s->s_fs_info = server; 2356 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2357 ret = set_anon_super(s, server); 2358 if (ret == 0) 2359 server->s_dev = s->s_dev; 2360 return ret; 2361 } 2362 2363 static int nfs_compare_super_address(struct nfs_server *server1, 2364 struct nfs_server *server2) 2365 { 2366 struct sockaddr *sap1, *sap2; 2367 2368 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2369 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2370 2371 if (sap1->sa_family != sap2->sa_family) 2372 return 0; 2373 2374 switch (sap1->sa_family) { 2375 case AF_INET: { 2376 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2377 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2378 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2379 return 0; 2380 if (sin1->sin_port != sin2->sin_port) 2381 return 0; 2382 break; 2383 } 2384 case AF_INET6: { 2385 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2386 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2387 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2388 return 0; 2389 if (sin1->sin6_port != sin2->sin6_port) 2390 return 0; 2391 break; 2392 } 2393 default: 2394 return 0; 2395 } 2396 2397 return 1; 2398 } 2399 2400 static int nfs_compare_super(struct super_block *sb, void *data) 2401 { 2402 struct nfs_sb_mountdata *sb_mntdata = data; 2403 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2404 int mntflags = sb_mntdata->mntflags; 2405 2406 if (!nfs_compare_super_address(old, server)) 2407 return 0; 2408 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2409 if (old->flags & NFS_MOUNT_UNSHARED) 2410 return 0; 2411 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2412 return 0; 2413 return nfs_compare_mount_options(sb, server, mntflags); 2414 } 2415 2416 #ifdef CONFIG_NFS_FSCACHE 2417 static void nfs_get_cache_cookie(struct super_block *sb, 2418 struct nfs_parsed_mount_data *parsed, 2419 struct nfs_clone_mount *cloned) 2420 { 2421 struct nfs_server *nfss = NFS_SB(sb); 2422 char *uniq = NULL; 2423 int ulen = 0; 2424 2425 nfss->fscache_key = NULL; 2426 nfss->fscache = NULL; 2427 2428 if (parsed) { 2429 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2430 return; 2431 if (parsed->fscache_uniq) { 2432 uniq = parsed->fscache_uniq; 2433 ulen = strlen(parsed->fscache_uniq); 2434 } 2435 } else if (cloned) { 2436 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2437 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2438 return; 2439 if (mnt_s->fscache_key) { 2440 uniq = mnt_s->fscache_key->key.uniquifier; 2441 ulen = mnt_s->fscache_key->key.uniq_len; 2442 }; 2443 } else 2444 return; 2445 2446 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2447 } 2448 #else 2449 static void nfs_get_cache_cookie(struct super_block *sb, 2450 struct nfs_parsed_mount_data *parsed, 2451 struct nfs_clone_mount *cloned) 2452 { 2453 } 2454 #endif 2455 2456 static int nfs_bdi_register(struct nfs_server *server) 2457 { 2458 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2459 } 2460 2461 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2462 struct nfs_mount_info *mount_info) 2463 { 2464 int error; 2465 unsigned long kflags = 0, kflags_out = 0; 2466 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2467 kflags |= SECURITY_LSM_NATIVE_LABELS; 2468 2469 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts, 2470 kflags, &kflags_out); 2471 if (error) 2472 goto err; 2473 2474 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2475 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2476 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2477 err: 2478 return error; 2479 } 2480 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2481 2482 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2483 struct nfs_mount_info *mount_info) 2484 { 2485 /* clone any lsm security options from the parent to the new sb */ 2486 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2487 return -ESTALE; 2488 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2489 } 2490 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2491 2492 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2493 int flags, const char *dev_name, 2494 struct nfs_mount_info *mount_info, 2495 struct nfs_subversion *nfs_mod) 2496 { 2497 struct super_block *s; 2498 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2499 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2500 struct nfs_sb_mountdata sb_mntdata = { 2501 .mntflags = flags, 2502 .server = server, 2503 }; 2504 int error; 2505 2506 if (server->flags & NFS_MOUNT_UNSHARED) 2507 compare_super = NULL; 2508 2509 /* -o noac implies -o sync */ 2510 if (server->flags & NFS_MOUNT_NOAC) 2511 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2512 2513 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) 2514 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS) 2515 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2516 2517 /* Get a superblock - note that we may end up sharing one that already exists */ 2518 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2519 if (IS_ERR(s)) { 2520 mntroot = ERR_CAST(s); 2521 goto out_err_nosb; 2522 } 2523 2524 if (s->s_fs_info != server) { 2525 nfs_free_server(server); 2526 server = NULL; 2527 } else { 2528 error = nfs_bdi_register(server); 2529 if (error) { 2530 mntroot = ERR_PTR(error); 2531 goto error_splat_bdi; 2532 } 2533 } 2534 2535 if (!s->s_root) { 2536 /* initial superblock/root creation */ 2537 mount_info->fill_super(s, mount_info); 2538 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2539 } 2540 2541 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2542 if (IS_ERR(mntroot)) 2543 goto error_splat_super; 2544 2545 error = mount_info->set_security(s, mntroot, mount_info); 2546 if (error) 2547 goto error_splat_root; 2548 2549 s->s_flags |= MS_ACTIVE; 2550 2551 out: 2552 return mntroot; 2553 2554 out_err_nosb: 2555 nfs_free_server(server); 2556 goto out; 2557 2558 error_splat_root: 2559 dput(mntroot); 2560 mntroot = ERR_PTR(error); 2561 error_splat_super: 2562 if (server && !s->s_root) 2563 bdi_unregister(&server->backing_dev_info); 2564 error_splat_bdi: 2565 deactivate_locked_super(s); 2566 goto out; 2567 } 2568 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2569 2570 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2571 int flags, const char *dev_name, void *raw_data) 2572 { 2573 struct nfs_mount_info mount_info = { 2574 .fill_super = nfs_fill_super, 2575 .set_security = nfs_set_sb_security, 2576 }; 2577 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2578 struct nfs_subversion *nfs_mod; 2579 int error; 2580 2581 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2582 mount_info.mntfh = nfs_alloc_fhandle(); 2583 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2584 goto out; 2585 2586 /* Validate the mount data */ 2587 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2588 if (error == NFS_TEXT_DATA) 2589 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2590 if (error < 0) { 2591 mntroot = ERR_PTR(error); 2592 goto out; 2593 } 2594 2595 nfs_mod = get_nfs_version(mount_info.parsed->version); 2596 if (IS_ERR(nfs_mod)) { 2597 mntroot = ERR_CAST(nfs_mod); 2598 goto out; 2599 } 2600 2601 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2602 2603 put_nfs_version(nfs_mod); 2604 out: 2605 nfs_free_parsed_mount_data(mount_info.parsed); 2606 nfs_free_fhandle(mount_info.mntfh); 2607 return mntroot; 2608 } 2609 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2610 2611 /* 2612 * Ensure that we unregister the bdi before kill_anon_super 2613 * releases the device name 2614 */ 2615 void nfs_put_super(struct super_block *s) 2616 { 2617 struct nfs_server *server = NFS_SB(s); 2618 2619 bdi_unregister(&server->backing_dev_info); 2620 } 2621 EXPORT_SYMBOL_GPL(nfs_put_super); 2622 2623 /* 2624 * Destroy an NFS2/3 superblock 2625 */ 2626 void nfs_kill_super(struct super_block *s) 2627 { 2628 struct nfs_server *server = NFS_SB(s); 2629 2630 kill_anon_super(s); 2631 nfs_fscache_release_super_cookie(s); 2632 nfs_free_server(server); 2633 } 2634 EXPORT_SYMBOL_GPL(nfs_kill_super); 2635 2636 /* 2637 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2638 */ 2639 static struct dentry * 2640 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2641 const char *dev_name, void *raw_data) 2642 { 2643 struct nfs_clone_mount *data = raw_data; 2644 struct nfs_mount_info mount_info = { 2645 .fill_super = nfs_clone_super, 2646 .set_security = nfs_clone_sb_security, 2647 .cloned = data, 2648 }; 2649 struct nfs_server *server; 2650 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2651 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2652 2653 dprintk("--> nfs_xdev_mount()\n"); 2654 2655 mount_info.mntfh = mount_info.cloned->fh; 2656 2657 /* create a new volume representation */ 2658 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2659 2660 if (IS_ERR(server)) 2661 mntroot = ERR_CAST(server); 2662 else 2663 mntroot = nfs_fs_mount_common(server, flags, 2664 dev_name, &mount_info, nfs_mod); 2665 2666 dprintk("<-- nfs_xdev_mount() = %ld\n", 2667 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2668 return mntroot; 2669 } 2670 2671 #if IS_ENABLED(CONFIG_NFS_V4) 2672 2673 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2674 { 2675 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2676 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2677 } 2678 2679 /* 2680 * Validate NFSv4 mount options 2681 */ 2682 static int nfs4_validate_mount_data(void *options, 2683 struct nfs_parsed_mount_data *args, 2684 const char *dev_name) 2685 { 2686 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2687 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2688 char *c; 2689 2690 if (data == NULL) 2691 goto out_no_data; 2692 2693 args->version = 4; 2694 2695 switch (data->version) { 2696 case 1: 2697 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2698 goto out_no_address; 2699 if (data->host_addrlen == 0) 2700 goto out_no_address; 2701 args->nfs_server.addrlen = data->host_addrlen; 2702 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2703 return -EFAULT; 2704 if (!nfs_verify_server_address(sap)) 2705 goto out_no_address; 2706 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2707 2708 if (data->auth_flavourlen) { 2709 rpc_authflavor_t pseudoflavor; 2710 if (data->auth_flavourlen > 1) 2711 goto out_inval_auth; 2712 if (copy_from_user(&pseudoflavor, 2713 data->auth_flavours, 2714 sizeof(pseudoflavor))) 2715 return -EFAULT; 2716 nfs_set_auth_parsed_mount_data(args, pseudoflavor); 2717 } else 2718 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX); 2719 2720 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2721 if (IS_ERR(c)) 2722 return PTR_ERR(c); 2723 args->nfs_server.hostname = c; 2724 2725 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2726 if (IS_ERR(c)) 2727 return PTR_ERR(c); 2728 args->nfs_server.export_path = c; 2729 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2730 2731 c = strndup_user(data->client_addr.data, 16); 2732 if (IS_ERR(c)) 2733 return PTR_ERR(c); 2734 args->client_address = c; 2735 2736 /* 2737 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2738 * can deal with. 2739 */ 2740 2741 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2742 args->rsize = data->rsize; 2743 args->wsize = data->wsize; 2744 args->timeo = data->timeo; 2745 args->retrans = data->retrans; 2746 args->acregmin = data->acregmin; 2747 args->acregmax = data->acregmax; 2748 args->acdirmin = data->acdirmin; 2749 args->acdirmax = data->acdirmax; 2750 args->nfs_server.protocol = data->proto; 2751 nfs_validate_transport_protocol(args); 2752 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2753 goto out_invalid_transport_udp; 2754 2755 break; 2756 default: 2757 return NFS_TEXT_DATA; 2758 } 2759 2760 return 0; 2761 2762 out_no_data: 2763 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2764 return -EINVAL; 2765 2766 out_inval_auth: 2767 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2768 data->auth_flavourlen); 2769 return -EINVAL; 2770 2771 out_no_address: 2772 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2773 return -EINVAL; 2774 2775 out_invalid_transport_udp: 2776 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2777 return -EINVAL; 2778 } 2779 2780 /* 2781 * NFS v4 module parameters need to stay in the 2782 * NFS client for backwards compatibility 2783 */ 2784 unsigned int nfs_callback_set_tcpport; 2785 unsigned short nfs_callback_tcpport; 2786 /* Default cache timeout is 10 minutes */ 2787 unsigned int nfs_idmap_cache_timeout = 600; 2788 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2789 bool nfs4_disable_idmapping = true; 2790 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2791 unsigned short send_implementation_id = 1; 2792 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2793 bool recover_lost_locks = false; 2794 2795 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2796 EXPORT_SYMBOL_GPL(nfs_callback_tcpport); 2797 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2798 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2799 EXPORT_SYMBOL_GPL(max_session_slots); 2800 EXPORT_SYMBOL_GPL(send_implementation_id); 2801 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2802 EXPORT_SYMBOL_GPL(recover_lost_locks); 2803 2804 #define NFS_CALLBACK_MAXPORTNR (65535U) 2805 2806 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2807 { 2808 unsigned long num; 2809 int ret; 2810 2811 if (!val) 2812 return -EINVAL; 2813 ret = kstrtoul(val, 0, &num); 2814 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2815 return -EINVAL; 2816 *((unsigned int *)kp->arg) = num; 2817 return 0; 2818 } 2819 static struct kernel_param_ops param_ops_portnr = { 2820 .set = param_set_portnr, 2821 .get = param_get_uint, 2822 }; 2823 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2824 2825 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2826 module_param(nfs_idmap_cache_timeout, int, 0644); 2827 module_param(nfs4_disable_idmapping, bool, 0644); 2828 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2829 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2830 MODULE_PARM_DESC(nfs4_disable_idmapping, 2831 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2832 module_param(max_session_slots, ushort, 0644); 2833 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2834 "requests the client will negotiate"); 2835 module_param(send_implementation_id, ushort, 0644); 2836 MODULE_PARM_DESC(send_implementation_id, 2837 "Send implementation ID with NFSv4.1 exchange_id"); 2838 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2839 2840 module_param(recover_lost_locks, bool, 0644); 2841 MODULE_PARM_DESC(recover_lost_locks, 2842 "If the server reports that a lock might be lost, " 2843 "try to recover it risking data corruption."); 2844 2845 2846 #endif /* CONFIG_NFS_V4 */ 2847