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/vfs.h> 47 #include <linux/inet.h> 48 #include <linux/in6.h> 49 #include <linux/slab.h> 50 #include <net/ipv6.h> 51 #include <linux/netdevice.h> 52 #include <linux/nfs_xdr.h> 53 #include <linux/magic.h> 54 #include <linux/parser.h> 55 #include <linux/nsproxy.h> 56 #include <linux/rcupdate.h> 57 58 #include <linux/uaccess.h> 59 60 #include "nfs4_fs.h" 61 #include "callback.h" 62 #include "delegation.h" 63 #include "iostat.h" 64 #include "internal.h" 65 #include "fscache.h" 66 #include "nfs4session.h" 67 #include "pnfs.h" 68 #include "nfs.h" 69 70 #define NFSDBG_FACILITY NFSDBG_VFS 71 #define NFS_TEXT_DATA 1 72 73 #if IS_ENABLED(CONFIG_NFS_V3) 74 #define NFS_DEFAULT_VERSION 3 75 #else 76 #define NFS_DEFAULT_VERSION 2 77 #endif 78 79 enum { 80 /* Mount options that take no arguments */ 81 Opt_soft, Opt_hard, 82 Opt_posix, Opt_noposix, 83 Opt_cto, Opt_nocto, 84 Opt_ac, Opt_noac, 85 Opt_lock, Opt_nolock, 86 Opt_udp, Opt_tcp, Opt_rdma, 87 Opt_acl, Opt_noacl, 88 Opt_rdirplus, Opt_nordirplus, 89 Opt_sharecache, Opt_nosharecache, 90 Opt_resvport, Opt_noresvport, 91 Opt_fscache, Opt_nofscache, 92 Opt_migration, Opt_nomigration, 93 94 /* Mount options that take integer arguments */ 95 Opt_port, 96 Opt_rsize, Opt_wsize, Opt_bsize, 97 Opt_timeo, Opt_retrans, 98 Opt_acregmin, Opt_acregmax, 99 Opt_acdirmin, Opt_acdirmax, 100 Opt_actimeo, 101 Opt_namelen, 102 Opt_mountport, 103 Opt_mountvers, 104 Opt_minorversion, 105 106 /* Mount options that take string arguments */ 107 Opt_nfsvers, 108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 109 Opt_addr, Opt_mountaddr, Opt_clientaddr, 110 Opt_lookupcache, 111 Opt_fscache_uniq, 112 Opt_local_lock, 113 114 /* Special mount options */ 115 Opt_userspace, Opt_deprecated, Opt_sloppy, 116 117 Opt_err 118 }; 119 120 static const match_table_t nfs_mount_option_tokens = { 121 { Opt_userspace, "bg" }, 122 { Opt_userspace, "fg" }, 123 { Opt_userspace, "retry=%s" }, 124 125 { Opt_sloppy, "sloppy" }, 126 127 { Opt_soft, "soft" }, 128 { Opt_hard, "hard" }, 129 { Opt_deprecated, "intr" }, 130 { Opt_deprecated, "nointr" }, 131 { Opt_posix, "posix" }, 132 { Opt_noposix, "noposix" }, 133 { Opt_cto, "cto" }, 134 { Opt_nocto, "nocto" }, 135 { Opt_ac, "ac" }, 136 { Opt_noac, "noac" }, 137 { Opt_lock, "lock" }, 138 { Opt_nolock, "nolock" }, 139 { Opt_udp, "udp" }, 140 { Opt_tcp, "tcp" }, 141 { Opt_rdma, "rdma" }, 142 { Opt_acl, "acl" }, 143 { Opt_noacl, "noacl" }, 144 { Opt_rdirplus, "rdirplus" }, 145 { Opt_nordirplus, "nordirplus" }, 146 { Opt_sharecache, "sharecache" }, 147 { Opt_nosharecache, "nosharecache" }, 148 { Opt_resvport, "resvport" }, 149 { Opt_noresvport, "noresvport" }, 150 { Opt_fscache, "fsc" }, 151 { Opt_nofscache, "nofsc" }, 152 { Opt_migration, "migration" }, 153 { Opt_nomigration, "nomigration" }, 154 155 { Opt_port, "port=%s" }, 156 { Opt_rsize, "rsize=%s" }, 157 { Opt_wsize, "wsize=%s" }, 158 { Opt_bsize, "bsize=%s" }, 159 { Opt_timeo, "timeo=%s" }, 160 { Opt_retrans, "retrans=%s" }, 161 { Opt_acregmin, "acregmin=%s" }, 162 { Opt_acregmax, "acregmax=%s" }, 163 { Opt_acdirmin, "acdirmin=%s" }, 164 { Opt_acdirmax, "acdirmax=%s" }, 165 { Opt_actimeo, "actimeo=%s" }, 166 { Opt_namelen, "namlen=%s" }, 167 { Opt_mountport, "mountport=%s" }, 168 { Opt_mountvers, "mountvers=%s" }, 169 { Opt_minorversion, "minorversion=%s" }, 170 171 { Opt_nfsvers, "nfsvers=%s" }, 172 { Opt_nfsvers, "vers=%s" }, 173 174 { Opt_sec, "sec=%s" }, 175 { Opt_proto, "proto=%s" }, 176 { Opt_mountproto, "mountproto=%s" }, 177 { Opt_addr, "addr=%s" }, 178 { Opt_clientaddr, "clientaddr=%s" }, 179 { Opt_mounthost, "mounthost=%s" }, 180 { Opt_mountaddr, "mountaddr=%s" }, 181 182 { Opt_lookupcache, "lookupcache=%s" }, 183 { Opt_fscache_uniq, "fsc=%s" }, 184 { Opt_local_lock, "local_lock=%s" }, 185 186 /* The following needs to be listed after all other options */ 187 { Opt_nfsvers, "v%s" }, 188 189 { Opt_err, NULL } 190 }; 191 192 enum { 193 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 194 Opt_xprt_rdma6, 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 { Opt_xprt_rdma6, "rdma6" }, 206 207 { Opt_xprt_err, NULL } 208 }; 209 210 enum { 211 Opt_sec_none, Opt_sec_sys, 212 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 213 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 214 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 215 216 Opt_sec_err 217 }; 218 219 static const match_table_t nfs_secflavor_tokens = { 220 { Opt_sec_none, "none" }, 221 { Opt_sec_none, "null" }, 222 { Opt_sec_sys, "sys" }, 223 224 { Opt_sec_krb5, "krb5" }, 225 { Opt_sec_krb5i, "krb5i" }, 226 { Opt_sec_krb5p, "krb5p" }, 227 228 { Opt_sec_lkey, "lkey" }, 229 { Opt_sec_lkeyi, "lkeyi" }, 230 { Opt_sec_lkeyp, "lkeyp" }, 231 232 { Opt_sec_spkm, "spkm3" }, 233 { Opt_sec_spkmi, "spkm3i" }, 234 { Opt_sec_spkmp, "spkm3p" }, 235 236 { Opt_sec_err, NULL } 237 }; 238 239 enum { 240 Opt_lookupcache_all, Opt_lookupcache_positive, 241 Opt_lookupcache_none, 242 243 Opt_lookupcache_err 244 }; 245 246 static match_table_t nfs_lookupcache_tokens = { 247 { Opt_lookupcache_all, "all" }, 248 { Opt_lookupcache_positive, "pos" }, 249 { Opt_lookupcache_positive, "positive" }, 250 { Opt_lookupcache_none, "none" }, 251 252 { Opt_lookupcache_err, NULL } 253 }; 254 255 enum { 256 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 257 Opt_local_lock_none, 258 259 Opt_local_lock_err 260 }; 261 262 static match_table_t nfs_local_lock_tokens = { 263 { Opt_local_lock_all, "all" }, 264 { Opt_local_lock_flock, "flock" }, 265 { Opt_local_lock_posix, "posix" }, 266 { Opt_local_lock_none, "none" }, 267 268 { Opt_local_lock_err, NULL } 269 }; 270 271 enum { 272 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 273 Opt_vers_4_1, Opt_vers_4_2, 274 275 Opt_vers_err 276 }; 277 278 static match_table_t nfs_vers_tokens = { 279 { Opt_vers_2, "2" }, 280 { Opt_vers_3, "3" }, 281 { Opt_vers_4, "4" }, 282 { Opt_vers_4_0, "4.0" }, 283 { Opt_vers_4_1, "4.1" }, 284 { Opt_vers_4_2, "4.2" }, 285 286 { Opt_vers_err, NULL } 287 }; 288 289 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 290 int flags, const char *dev_name, void *raw_data); 291 292 struct file_system_type nfs_fs_type = { 293 .owner = THIS_MODULE, 294 .name = "nfs", 295 .mount = nfs_fs_mount, 296 .kill_sb = nfs_kill_super, 297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 298 }; 299 MODULE_ALIAS_FS("nfs"); 300 EXPORT_SYMBOL_GPL(nfs_fs_type); 301 302 struct file_system_type nfs_xdev_fs_type = { 303 .owner = THIS_MODULE, 304 .name = "nfs", 305 .mount = nfs_xdev_mount, 306 .kill_sb = nfs_kill_super, 307 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 308 }; 309 310 const struct super_operations nfs_sops = { 311 .alloc_inode = nfs_alloc_inode, 312 .destroy_inode = nfs_destroy_inode, 313 .write_inode = nfs_write_inode, 314 .drop_inode = nfs_drop_inode, 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 ret = register_shrinker(&acl_shrinker); 387 if (ret < 0) 388 goto error_3; 389 return 0; 390 error_3: 391 nfs_unregister_sysctl(); 392 error_2: 393 unregister_nfs4_fs(); 394 error_1: 395 unregister_filesystem(&nfs_fs_type); 396 error_0: 397 return ret; 398 } 399 400 /* 401 * Unregister the NFS filesystems 402 */ 403 void __exit unregister_nfs_fs(void) 404 { 405 unregister_shrinker(&acl_shrinker); 406 nfs_unregister_sysctl(); 407 unregister_nfs4_fs(); 408 unregister_filesystem(&nfs_fs_type); 409 } 410 411 bool nfs_sb_active(struct super_block *sb) 412 { 413 struct nfs_server *server = NFS_SB(sb); 414 415 if (!atomic_inc_not_zero(&sb->s_active)) 416 return false; 417 if (atomic_inc_return(&server->active) != 1) 418 atomic_dec(&sb->s_active); 419 return true; 420 } 421 EXPORT_SYMBOL_GPL(nfs_sb_active); 422 423 void nfs_sb_deactive(struct super_block *sb) 424 { 425 struct nfs_server *server = NFS_SB(sb); 426 427 if (atomic_dec_and_test(&server->active)) 428 deactivate_super(sb); 429 } 430 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 431 432 /* 433 * Deliver file system statistics to userspace 434 */ 435 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 436 { 437 struct nfs_server *server = NFS_SB(dentry->d_sb); 438 unsigned char blockbits; 439 unsigned long blockres; 440 struct nfs_fh *fh = NFS_FH(d_inode(dentry)); 441 struct nfs_fsstat res; 442 int error = -ENOMEM; 443 444 res.fattr = nfs_alloc_fattr(); 445 if (res.fattr == NULL) 446 goto out_err; 447 448 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 449 if (unlikely(error == -ESTALE)) { 450 struct dentry *pd_dentry; 451 452 pd_dentry = dget_parent(dentry); 453 if (pd_dentry != NULL) { 454 nfs_zap_caches(d_inode(pd_dentry)); 455 dput(pd_dentry); 456 } 457 } 458 nfs_free_fattr(res.fattr); 459 if (error < 0) 460 goto out_err; 461 462 buf->f_type = NFS_SUPER_MAGIC; 463 464 /* 465 * Current versions of glibc do not correctly handle the 466 * case where f_frsize != f_bsize. Eventually we want to 467 * report the value of wtmult in this field. 468 */ 469 buf->f_frsize = dentry->d_sb->s_blocksize; 470 471 /* 472 * On most *nix systems, f_blocks, f_bfree, and f_bavail 473 * are reported in units of f_frsize. Linux hasn't had 474 * an f_frsize field in its statfs struct until recently, 475 * thus historically Linux's sys_statfs reports these 476 * fields in units of f_bsize. 477 */ 478 buf->f_bsize = dentry->d_sb->s_blocksize; 479 blockbits = dentry->d_sb->s_blocksize_bits; 480 blockres = (1 << blockbits) - 1; 481 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 482 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 483 buf->f_bavail = (res.abytes + blockres) >> blockbits; 484 485 buf->f_files = res.tfiles; 486 buf->f_ffree = res.afiles; 487 488 buf->f_namelen = server->namelen; 489 490 return 0; 491 492 out_err: 493 dprintk("%s: statfs error = %d\n", __func__, -error); 494 return error; 495 } 496 EXPORT_SYMBOL_GPL(nfs_statfs); 497 498 /* 499 * Map the security flavour number to a name 500 */ 501 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 502 { 503 static const struct { 504 rpc_authflavor_t flavour; 505 const char *str; 506 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { 507 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ 508 { RPC_AUTH_NULL, "null" }, 509 { RPC_AUTH_UNIX, "sys" }, 510 { RPC_AUTH_GSS_KRB5, "krb5" }, 511 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 512 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 513 { RPC_AUTH_GSS_LKEY, "lkey" }, 514 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 515 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 516 { RPC_AUTH_GSS_SPKM, "spkm" }, 517 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 518 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 519 { UINT_MAX, "unknown" } 520 }; 521 int i; 522 523 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 524 if (sec_flavours[i].flavour == flavour) 525 break; 526 } 527 return sec_flavours[i].str; 528 } 529 530 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 531 int showdefaults) 532 { 533 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 534 char *proto = NULL; 535 536 switch (sap->sa_family) { 537 case AF_INET: 538 switch (nfss->mountd_protocol) { 539 case IPPROTO_UDP: 540 proto = RPCBIND_NETID_UDP; 541 break; 542 case IPPROTO_TCP: 543 proto = RPCBIND_NETID_TCP; 544 break; 545 } 546 break; 547 case AF_INET6: 548 switch (nfss->mountd_protocol) { 549 case IPPROTO_UDP: 550 proto = RPCBIND_NETID_UDP6; 551 break; 552 case IPPROTO_TCP: 553 proto = RPCBIND_NETID_TCP6; 554 break; 555 } 556 break; 557 } 558 if (proto || showdefaults) 559 seq_printf(m, ",mountproto=%s", proto ?: "auto"); 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, sb_rdonly(root->d_sb) ? "ro" : "rw"); 816 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : ""); 817 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : ""); 818 seq_puts(m, root->d_sb->s_flags & SB_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.fscache[i]); 883 } 884 #endif 885 seq_printf(m, "\n"); 886 887 rpc_clnt_show_stats(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->timeo = NFS_UNSPEC_TIMEO; 920 data->retrans = NFS_UNSPEC_RETRANS; 921 data->acregmin = NFS_DEF_ACREGMIN; 922 data->acregmax = NFS_DEF_ACREGMAX; 923 data->acdirmin = NFS_DEF_ACDIRMIN; 924 data->acdirmax = NFS_DEF_ACDIRMAX; 925 data->mount_server.port = NFS_UNSPEC_PORT; 926 data->nfs_server.port = NFS_UNSPEC_PORT; 927 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 928 data->selected_flavor = RPC_AUTH_MAXFLAVOR; 929 data->minorversion = 0; 930 data->need_mount = true; 931 data->net = current->nsproxy->net_ns; 932 data->lsm_opts = NULL; 933 } 934 return data; 935 } 936 937 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 938 { 939 if (data) { 940 kfree(data->client_address); 941 kfree(data->mount_server.hostname); 942 kfree(data->nfs_server.export_path); 943 kfree(data->nfs_server.hostname); 944 kfree(data->fscache_uniq); 945 security_free_mnt_opts(&data->lsm_opts); 946 kfree(data); 947 } 948 } 949 950 /* 951 * Sanity-check a server address provided by the mount command. 952 * 953 * Address family must be initialized, and address must not be 954 * the ANY address for that family. 955 */ 956 static int nfs_verify_server_address(struct sockaddr *addr) 957 { 958 switch (addr->sa_family) { 959 case AF_INET: { 960 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 961 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 962 } 963 case AF_INET6: { 964 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 965 return !ipv6_addr_any(sa); 966 } 967 } 968 969 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 970 return 0; 971 } 972 973 /* 974 * Select between a default port value and a user-specified port value. 975 * If a zero value is set, then autobind will be used. 976 */ 977 static void nfs_set_port(struct sockaddr *sap, int *port, 978 const unsigned short default_port) 979 { 980 if (*port == NFS_UNSPEC_PORT) 981 *port = default_port; 982 983 rpc_set_port(sap, *port); 984 } 985 986 /* 987 * Sanity check the NFS transport protocol. 988 * 989 */ 990 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 991 { 992 switch (mnt->nfs_server.protocol) { 993 case XPRT_TRANSPORT_UDP: 994 case XPRT_TRANSPORT_TCP: 995 case XPRT_TRANSPORT_RDMA: 996 break; 997 default: 998 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 999 } 1000 } 1001 1002 /* 1003 * For text based NFSv2/v3 mounts, the mount protocol transport default 1004 * settings should depend upon the specified NFS transport. 1005 */ 1006 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1007 { 1008 nfs_validate_transport_protocol(mnt); 1009 1010 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1011 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1012 return; 1013 switch (mnt->nfs_server.protocol) { 1014 case XPRT_TRANSPORT_UDP: 1015 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1016 break; 1017 case XPRT_TRANSPORT_TCP: 1018 case XPRT_TRANSPORT_RDMA: 1019 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1020 } 1021 } 1022 1023 /* 1024 * Add 'flavor' to 'auth_info' if not already present. 1025 * Returns true if 'flavor' ends up in the list, false otherwise 1026 */ 1027 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, 1028 rpc_authflavor_t flavor) 1029 { 1030 unsigned int i; 1031 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors); 1032 1033 /* make sure this flavor isn't already in the list */ 1034 for (i = 0; i < auth_info->flavor_len; i++) { 1035 if (flavor == auth_info->flavors[i]) 1036 return true; 1037 } 1038 1039 if (auth_info->flavor_len + 1 >= max_flavor_len) { 1040 dfprintk(MOUNT, "NFS: too many sec= flavors\n"); 1041 return false; 1042 } 1043 1044 auth_info->flavors[auth_info->flavor_len++] = flavor; 1045 return true; 1046 } 1047 1048 /* 1049 * Return true if 'match' is in auth_info or auth_info is empty. 1050 * Return false otherwise. 1051 */ 1052 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 1053 rpc_authflavor_t match) 1054 { 1055 int i; 1056 1057 if (!auth_info->flavor_len) 1058 return true; 1059 1060 for (i = 0; i < auth_info->flavor_len; i++) { 1061 if (auth_info->flavors[i] == match) 1062 return true; 1063 } 1064 return false; 1065 } 1066 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 1067 1068 /* 1069 * Parse the value of the 'sec=' option. 1070 */ 1071 static int nfs_parse_security_flavors(char *value, 1072 struct nfs_parsed_mount_data *mnt) 1073 { 1074 substring_t args[MAX_OPT_ARGS]; 1075 rpc_authflavor_t pseudoflavor; 1076 char *p; 1077 1078 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1079 1080 while ((p = strsep(&value, ":")) != NULL) { 1081 switch (match_token(p, nfs_secflavor_tokens, args)) { 1082 case Opt_sec_none: 1083 pseudoflavor = RPC_AUTH_NULL; 1084 break; 1085 case Opt_sec_sys: 1086 pseudoflavor = RPC_AUTH_UNIX; 1087 break; 1088 case Opt_sec_krb5: 1089 pseudoflavor = RPC_AUTH_GSS_KRB5; 1090 break; 1091 case Opt_sec_krb5i: 1092 pseudoflavor = RPC_AUTH_GSS_KRB5I; 1093 break; 1094 case Opt_sec_krb5p: 1095 pseudoflavor = RPC_AUTH_GSS_KRB5P; 1096 break; 1097 case Opt_sec_lkey: 1098 pseudoflavor = RPC_AUTH_GSS_LKEY; 1099 break; 1100 case Opt_sec_lkeyi: 1101 pseudoflavor = RPC_AUTH_GSS_LKEYI; 1102 break; 1103 case Opt_sec_lkeyp: 1104 pseudoflavor = RPC_AUTH_GSS_LKEYP; 1105 break; 1106 case Opt_sec_spkm: 1107 pseudoflavor = RPC_AUTH_GSS_SPKM; 1108 break; 1109 case Opt_sec_spkmi: 1110 pseudoflavor = RPC_AUTH_GSS_SPKMI; 1111 break; 1112 case Opt_sec_spkmp: 1113 pseudoflavor = RPC_AUTH_GSS_SPKMP; 1114 break; 1115 default: 1116 dfprintk(MOUNT, 1117 "NFS: sec= option '%s' not recognized\n", p); 1118 return 0; 1119 } 1120 1121 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor)) 1122 return 0; 1123 } 1124 1125 return 1; 1126 } 1127 1128 static int nfs_parse_version_string(char *string, 1129 struct nfs_parsed_mount_data *mnt, 1130 substring_t *args) 1131 { 1132 mnt->flags &= ~NFS_MOUNT_VER3; 1133 switch (match_token(string, nfs_vers_tokens, args)) { 1134 case Opt_vers_2: 1135 mnt->version = 2; 1136 break; 1137 case Opt_vers_3: 1138 mnt->flags |= NFS_MOUNT_VER3; 1139 mnt->version = 3; 1140 break; 1141 case Opt_vers_4: 1142 /* Backward compatibility option. In future, 1143 * the mount program should always supply 1144 * a NFSv4 minor version number. 1145 */ 1146 mnt->version = 4; 1147 break; 1148 case Opt_vers_4_0: 1149 mnt->version = 4; 1150 mnt->minorversion = 0; 1151 break; 1152 case Opt_vers_4_1: 1153 mnt->version = 4; 1154 mnt->minorversion = 1; 1155 break; 1156 case Opt_vers_4_2: 1157 mnt->version = 4; 1158 mnt->minorversion = 2; 1159 break; 1160 default: 1161 return 0; 1162 } 1163 return 1; 1164 } 1165 1166 static int nfs_get_option_str(substring_t args[], char **option) 1167 { 1168 kfree(*option); 1169 *option = match_strdup(args); 1170 return !*option; 1171 } 1172 1173 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1174 { 1175 int rc; 1176 char *string; 1177 1178 string = match_strdup(args); 1179 if (string == NULL) 1180 return -ENOMEM; 1181 rc = kstrtoul(string, 10, option); 1182 kfree(string); 1183 1184 return rc; 1185 } 1186 1187 static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option, 1188 unsigned long l_bound, unsigned long u_bound) 1189 { 1190 int ret; 1191 1192 ret = nfs_get_option_ul(args, option); 1193 if (ret != 0) 1194 return ret; 1195 if (*option < l_bound || *option > u_bound) 1196 return -ERANGE; 1197 return 0; 1198 } 1199 1200 /* 1201 * Error-check and convert a string of mount options from user space into 1202 * a data structure. The whole mount string is processed; bad options are 1203 * skipped as they are encountered. If there were no errors, return 1; 1204 * otherwise return 0 (zero). 1205 */ 1206 static int nfs_parse_mount_options(char *raw, 1207 struct nfs_parsed_mount_data *mnt) 1208 { 1209 char *p, *string; 1210 int rc, sloppy = 0, invalid_option = 0; 1211 unsigned short protofamily = AF_UNSPEC; 1212 unsigned short mountfamily = AF_UNSPEC; 1213 1214 if (!raw) { 1215 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1216 return 1; 1217 } 1218 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1219 1220 rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts); 1221 if (rc) 1222 goto out_security_failure; 1223 1224 while ((p = strsep(&raw, ",")) != NULL) { 1225 substring_t args[MAX_OPT_ARGS]; 1226 unsigned long option; 1227 int token; 1228 1229 if (!*p) 1230 continue; 1231 1232 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1233 1234 token = match_token(p, nfs_mount_option_tokens, args); 1235 switch (token) { 1236 1237 /* 1238 * boolean options: foo/nofoo 1239 */ 1240 case Opt_soft: 1241 mnt->flags |= NFS_MOUNT_SOFT; 1242 break; 1243 case Opt_hard: 1244 mnt->flags &= ~NFS_MOUNT_SOFT; 1245 break; 1246 case Opt_posix: 1247 mnt->flags |= NFS_MOUNT_POSIX; 1248 break; 1249 case Opt_noposix: 1250 mnt->flags &= ~NFS_MOUNT_POSIX; 1251 break; 1252 case Opt_cto: 1253 mnt->flags &= ~NFS_MOUNT_NOCTO; 1254 break; 1255 case Opt_nocto: 1256 mnt->flags |= NFS_MOUNT_NOCTO; 1257 break; 1258 case Opt_ac: 1259 mnt->flags &= ~NFS_MOUNT_NOAC; 1260 break; 1261 case Opt_noac: 1262 mnt->flags |= NFS_MOUNT_NOAC; 1263 break; 1264 case Opt_lock: 1265 mnt->flags &= ~NFS_MOUNT_NONLM; 1266 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1267 NFS_MOUNT_LOCAL_FCNTL); 1268 break; 1269 case Opt_nolock: 1270 mnt->flags |= NFS_MOUNT_NONLM; 1271 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1272 NFS_MOUNT_LOCAL_FCNTL); 1273 break; 1274 case Opt_udp: 1275 mnt->flags &= ~NFS_MOUNT_TCP; 1276 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1277 break; 1278 case Opt_tcp: 1279 mnt->flags |= NFS_MOUNT_TCP; 1280 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1281 break; 1282 case Opt_rdma: 1283 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1284 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1285 xprt_load_transport(p); 1286 break; 1287 case Opt_acl: 1288 mnt->flags &= ~NFS_MOUNT_NOACL; 1289 break; 1290 case Opt_noacl: 1291 mnt->flags |= NFS_MOUNT_NOACL; 1292 break; 1293 case Opt_rdirplus: 1294 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1295 break; 1296 case Opt_nordirplus: 1297 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1298 break; 1299 case Opt_sharecache: 1300 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1301 break; 1302 case Opt_nosharecache: 1303 mnt->flags |= NFS_MOUNT_UNSHARED; 1304 break; 1305 case Opt_resvport: 1306 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1307 break; 1308 case Opt_noresvport: 1309 mnt->flags |= NFS_MOUNT_NORESVPORT; 1310 break; 1311 case Opt_fscache: 1312 mnt->options |= NFS_OPTION_FSCACHE; 1313 kfree(mnt->fscache_uniq); 1314 mnt->fscache_uniq = NULL; 1315 break; 1316 case Opt_nofscache: 1317 mnt->options &= ~NFS_OPTION_FSCACHE; 1318 kfree(mnt->fscache_uniq); 1319 mnt->fscache_uniq = NULL; 1320 break; 1321 case Opt_migration: 1322 mnt->options |= NFS_OPTION_MIGRATION; 1323 break; 1324 case Opt_nomigration: 1325 mnt->options &= ~NFS_OPTION_MIGRATION; 1326 break; 1327 1328 /* 1329 * options that take numeric values 1330 */ 1331 case Opt_port: 1332 if (nfs_get_option_ul(args, &option) || 1333 option > USHRT_MAX) 1334 goto out_invalid_value; 1335 mnt->nfs_server.port = option; 1336 break; 1337 case Opt_rsize: 1338 if (nfs_get_option_ul(args, &option)) 1339 goto out_invalid_value; 1340 mnt->rsize = option; 1341 break; 1342 case Opt_wsize: 1343 if (nfs_get_option_ul(args, &option)) 1344 goto out_invalid_value; 1345 mnt->wsize = option; 1346 break; 1347 case Opt_bsize: 1348 if (nfs_get_option_ul(args, &option)) 1349 goto out_invalid_value; 1350 mnt->bsize = option; 1351 break; 1352 case Opt_timeo: 1353 if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX)) 1354 goto out_invalid_value; 1355 mnt->timeo = option; 1356 break; 1357 case Opt_retrans: 1358 if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX)) 1359 goto out_invalid_value; 1360 mnt->retrans = option; 1361 break; 1362 case Opt_acregmin: 1363 if (nfs_get_option_ul(args, &option)) 1364 goto out_invalid_value; 1365 mnt->acregmin = option; 1366 break; 1367 case Opt_acregmax: 1368 if (nfs_get_option_ul(args, &option)) 1369 goto out_invalid_value; 1370 mnt->acregmax = option; 1371 break; 1372 case Opt_acdirmin: 1373 if (nfs_get_option_ul(args, &option)) 1374 goto out_invalid_value; 1375 mnt->acdirmin = option; 1376 break; 1377 case Opt_acdirmax: 1378 if (nfs_get_option_ul(args, &option)) 1379 goto out_invalid_value; 1380 mnt->acdirmax = option; 1381 break; 1382 case Opt_actimeo: 1383 if (nfs_get_option_ul(args, &option)) 1384 goto out_invalid_value; 1385 mnt->acregmin = mnt->acregmax = 1386 mnt->acdirmin = mnt->acdirmax = option; 1387 break; 1388 case Opt_namelen: 1389 if (nfs_get_option_ul(args, &option)) 1390 goto out_invalid_value; 1391 mnt->namlen = option; 1392 break; 1393 case Opt_mountport: 1394 if (nfs_get_option_ul(args, &option) || 1395 option > USHRT_MAX) 1396 goto out_invalid_value; 1397 mnt->mount_server.port = option; 1398 break; 1399 case Opt_mountvers: 1400 if (nfs_get_option_ul(args, &option) || 1401 option < NFS_MNT_VERSION || 1402 option > NFS_MNT3_VERSION) 1403 goto out_invalid_value; 1404 mnt->mount_server.version = option; 1405 break; 1406 case Opt_minorversion: 1407 if (nfs_get_option_ul(args, &option)) 1408 goto out_invalid_value; 1409 if (option > NFS4_MAX_MINOR_VERSION) 1410 goto out_invalid_value; 1411 mnt->minorversion = option; 1412 break; 1413 1414 /* 1415 * options that take text values 1416 */ 1417 case Opt_nfsvers: 1418 string = match_strdup(args); 1419 if (string == NULL) 1420 goto out_nomem; 1421 rc = nfs_parse_version_string(string, mnt, args); 1422 kfree(string); 1423 if (!rc) 1424 goto out_invalid_value; 1425 break; 1426 case Opt_sec: 1427 string = match_strdup(args); 1428 if (string == NULL) 1429 goto out_nomem; 1430 rc = nfs_parse_security_flavors(string, mnt); 1431 kfree(string); 1432 if (!rc) { 1433 dfprintk(MOUNT, "NFS: unrecognized " 1434 "security flavor\n"); 1435 return 0; 1436 } 1437 break; 1438 case Opt_proto: 1439 string = match_strdup(args); 1440 if (string == NULL) 1441 goto out_nomem; 1442 token = match_token(string, 1443 nfs_xprt_protocol_tokens, args); 1444 1445 protofamily = AF_INET; 1446 switch (token) { 1447 case Opt_xprt_udp6: 1448 protofamily = AF_INET6; 1449 /* fall through */ 1450 case Opt_xprt_udp: 1451 mnt->flags &= ~NFS_MOUNT_TCP; 1452 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1453 break; 1454 case Opt_xprt_tcp6: 1455 protofamily = AF_INET6; 1456 /* fall through */ 1457 case Opt_xprt_tcp: 1458 mnt->flags |= NFS_MOUNT_TCP; 1459 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1460 break; 1461 case Opt_xprt_rdma6: 1462 protofamily = AF_INET6; 1463 /* fall through */ 1464 case Opt_xprt_rdma: 1465 /* vector side protocols to TCP */ 1466 mnt->flags |= NFS_MOUNT_TCP; 1467 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1468 xprt_load_transport(string); 1469 break; 1470 default: 1471 dfprintk(MOUNT, "NFS: unrecognized " 1472 "transport protocol\n"); 1473 kfree(string); 1474 return 0; 1475 } 1476 kfree(string); 1477 break; 1478 case Opt_mountproto: 1479 string = match_strdup(args); 1480 if (string == NULL) 1481 goto out_nomem; 1482 token = match_token(string, 1483 nfs_xprt_protocol_tokens, args); 1484 kfree(string); 1485 1486 mountfamily = AF_INET; 1487 switch (token) { 1488 case Opt_xprt_udp6: 1489 mountfamily = AF_INET6; 1490 /* fall through */ 1491 case Opt_xprt_udp: 1492 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1493 break; 1494 case Opt_xprt_tcp6: 1495 mountfamily = AF_INET6; 1496 /* fall through */ 1497 case Opt_xprt_tcp: 1498 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1499 break; 1500 case Opt_xprt_rdma: /* not used for side protocols */ 1501 default: 1502 dfprintk(MOUNT, "NFS: unrecognized " 1503 "transport protocol\n"); 1504 return 0; 1505 } 1506 break; 1507 case Opt_addr: 1508 string = match_strdup(args); 1509 if (string == NULL) 1510 goto out_nomem; 1511 mnt->nfs_server.addrlen = 1512 rpc_pton(mnt->net, string, strlen(string), 1513 (struct sockaddr *) 1514 &mnt->nfs_server.address, 1515 sizeof(mnt->nfs_server.address)); 1516 kfree(string); 1517 if (mnt->nfs_server.addrlen == 0) 1518 goto out_invalid_address; 1519 break; 1520 case Opt_clientaddr: 1521 if (nfs_get_option_str(args, &mnt->client_address)) 1522 goto out_nomem; 1523 break; 1524 case Opt_mounthost: 1525 if (nfs_get_option_str(args, 1526 &mnt->mount_server.hostname)) 1527 goto out_nomem; 1528 break; 1529 case Opt_mountaddr: 1530 string = match_strdup(args); 1531 if (string == NULL) 1532 goto out_nomem; 1533 mnt->mount_server.addrlen = 1534 rpc_pton(mnt->net, string, strlen(string), 1535 (struct sockaddr *) 1536 &mnt->mount_server.address, 1537 sizeof(mnt->mount_server.address)); 1538 kfree(string); 1539 if (mnt->mount_server.addrlen == 0) 1540 goto out_invalid_address; 1541 break; 1542 case Opt_lookupcache: 1543 string = match_strdup(args); 1544 if (string == NULL) 1545 goto out_nomem; 1546 token = match_token(string, 1547 nfs_lookupcache_tokens, args); 1548 kfree(string); 1549 switch (token) { 1550 case Opt_lookupcache_all: 1551 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1552 break; 1553 case Opt_lookupcache_positive: 1554 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1555 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1556 break; 1557 case Opt_lookupcache_none: 1558 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1559 break; 1560 default: 1561 dfprintk(MOUNT, "NFS: invalid " 1562 "lookupcache argument\n"); 1563 return 0; 1564 }; 1565 break; 1566 case Opt_fscache_uniq: 1567 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1568 goto out_nomem; 1569 mnt->options |= NFS_OPTION_FSCACHE; 1570 break; 1571 case Opt_local_lock: 1572 string = match_strdup(args); 1573 if (string == NULL) 1574 goto out_nomem; 1575 token = match_token(string, nfs_local_lock_tokens, 1576 args); 1577 kfree(string); 1578 switch (token) { 1579 case Opt_local_lock_all: 1580 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1581 NFS_MOUNT_LOCAL_FCNTL); 1582 break; 1583 case Opt_local_lock_flock: 1584 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1585 break; 1586 case Opt_local_lock_posix: 1587 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1588 break; 1589 case Opt_local_lock_none: 1590 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1591 NFS_MOUNT_LOCAL_FCNTL); 1592 break; 1593 default: 1594 dfprintk(MOUNT, "NFS: invalid " 1595 "local_lock argument\n"); 1596 return 0; 1597 }; 1598 break; 1599 1600 /* 1601 * Special options 1602 */ 1603 case Opt_sloppy: 1604 sloppy = 1; 1605 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1606 break; 1607 case Opt_userspace: 1608 case Opt_deprecated: 1609 dfprintk(MOUNT, "NFS: ignoring mount option " 1610 "'%s'\n", p); 1611 break; 1612 1613 default: 1614 invalid_option = 1; 1615 dfprintk(MOUNT, "NFS: unrecognized mount option " 1616 "'%s'\n", p); 1617 } 1618 } 1619 1620 if (!sloppy && invalid_option) 1621 return 0; 1622 1623 if (mnt->minorversion && mnt->version != 4) 1624 goto out_minorversion_mismatch; 1625 1626 if (mnt->options & NFS_OPTION_MIGRATION && 1627 (mnt->version != 4 || mnt->minorversion != 0)) 1628 goto out_migration_misuse; 1629 1630 /* 1631 * verify that any proto=/mountproto= options match the address 1632 * families in the addr=/mountaddr= options. 1633 */ 1634 if (protofamily != AF_UNSPEC && 1635 protofamily != mnt->nfs_server.address.ss_family) 1636 goto out_proto_mismatch; 1637 1638 if (mountfamily != AF_UNSPEC) { 1639 if (mnt->mount_server.addrlen) { 1640 if (mountfamily != mnt->mount_server.address.ss_family) 1641 goto out_mountproto_mismatch; 1642 } else { 1643 if (mountfamily != mnt->nfs_server.address.ss_family) 1644 goto out_mountproto_mismatch; 1645 } 1646 } 1647 1648 return 1; 1649 1650 out_mountproto_mismatch: 1651 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1652 "option\n"); 1653 return 0; 1654 out_proto_mismatch: 1655 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1656 return 0; 1657 out_invalid_address: 1658 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1659 return 0; 1660 out_invalid_value: 1661 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1662 return 0; 1663 out_minorversion_mismatch: 1664 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1665 "minorversion=%u\n", mnt->version, mnt->minorversion); 1666 return 0; 1667 out_migration_misuse: 1668 printk(KERN_INFO 1669 "NFS: 'migration' not supported for this NFS version\n"); 1670 return 0; 1671 out_nomem: 1672 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1673 return 0; 1674 out_security_failure: 1675 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1676 return 0; 1677 } 1678 1679 /* 1680 * Ensure that a specified authtype in args->auth_info is supported by 1681 * the server. Returns 0 and sets args->selected_flavor if it's ok, and 1682 * -EACCES if not. 1683 */ 1684 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args, 1685 rpc_authflavor_t *server_authlist, unsigned int count) 1686 { 1687 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 1688 bool found_auth_null = false; 1689 unsigned int i; 1690 1691 /* 1692 * If the sec= mount option is used, the specified flavor or AUTH_NULL 1693 * must be in the list returned by the server. 1694 * 1695 * AUTH_NULL has a special meaning when it's in the server list - it 1696 * means that the server will ignore the rpc creds, so any flavor 1697 * can be used but still use the sec= that was specified. 1698 * 1699 * Note also that the MNT procedure in MNTv1 does not return a list 1700 * of supported security flavors. In this case, nfs_mount() fabricates 1701 * a security flavor list containing just AUTH_NULL. 1702 */ 1703 for (i = 0; i < count; i++) { 1704 flavor = server_authlist[i]; 1705 1706 if (nfs_auth_info_match(&args->auth_info, flavor)) 1707 goto out; 1708 1709 if (flavor == RPC_AUTH_NULL) 1710 found_auth_null = true; 1711 } 1712 1713 if (found_auth_null) { 1714 flavor = args->auth_info.flavors[0]; 1715 goto out; 1716 } 1717 1718 dfprintk(MOUNT, 1719 "NFS: specified auth flavors not supported by server\n"); 1720 return -EACCES; 1721 1722 out: 1723 args->selected_flavor = flavor; 1724 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor); 1725 return 0; 1726 } 1727 1728 /* 1729 * Use the remote server's MOUNT service to request the NFS file handle 1730 * corresponding to the provided path. 1731 */ 1732 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1733 struct nfs_fh *root_fh, 1734 rpc_authflavor_t *server_authlist, 1735 unsigned int *server_authlist_len) 1736 { 1737 struct nfs_mount_request request = { 1738 .sap = (struct sockaddr *) 1739 &args->mount_server.address, 1740 .dirpath = args->nfs_server.export_path, 1741 .protocol = args->mount_server.protocol, 1742 .fh = root_fh, 1743 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1744 .auth_flav_len = server_authlist_len, 1745 .auth_flavs = server_authlist, 1746 .net = args->net, 1747 }; 1748 int status; 1749 1750 if (args->mount_server.version == 0) { 1751 switch (args->version) { 1752 default: 1753 args->mount_server.version = NFS_MNT3_VERSION; 1754 break; 1755 case 2: 1756 args->mount_server.version = NFS_MNT_VERSION; 1757 } 1758 } 1759 request.version = args->mount_server.version; 1760 1761 if (args->mount_server.hostname) 1762 request.hostname = args->mount_server.hostname; 1763 else 1764 request.hostname = args->nfs_server.hostname; 1765 1766 /* 1767 * Construct the mount server's address. 1768 */ 1769 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1770 memcpy(request.sap, &args->nfs_server.address, 1771 args->nfs_server.addrlen); 1772 args->mount_server.addrlen = args->nfs_server.addrlen; 1773 } 1774 request.salen = args->mount_server.addrlen; 1775 nfs_set_port(request.sap, &args->mount_server.port, 0); 1776 1777 /* 1778 * Now ask the mount server to map our export path 1779 * to a file handle. 1780 */ 1781 status = nfs_mount(&request); 1782 if (status != 0) { 1783 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1784 request.hostname, status); 1785 return status; 1786 } 1787 1788 return 0; 1789 } 1790 1791 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, 1792 struct nfs_subversion *nfs_mod) 1793 { 1794 int status; 1795 unsigned int i; 1796 bool tried_auth_unix = false; 1797 bool auth_null_in_list = false; 1798 struct nfs_server *server = ERR_PTR(-EACCES); 1799 struct nfs_parsed_mount_data *args = mount_info->parsed; 1800 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 1801 unsigned int authlist_len = ARRAY_SIZE(authlist); 1802 1803 status = nfs_request_mount(args, mount_info->mntfh, authlist, 1804 &authlist_len); 1805 if (status) 1806 return ERR_PTR(status); 1807 1808 /* 1809 * Was a sec= authflavor specified in the options? First, verify 1810 * whether the server supports it, and then just try to use it if so. 1811 */ 1812 if (args->auth_info.flavor_len > 0) { 1813 status = nfs_verify_authflavors(args, authlist, authlist_len); 1814 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 1815 args->selected_flavor); 1816 if (status) 1817 return ERR_PTR(status); 1818 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1819 } 1820 1821 /* 1822 * No sec= option was provided. RFC 2623, section 2.7 suggests we 1823 * SHOULD prefer the flavor listed first. However, some servers list 1824 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 1825 */ 1826 for (i = 0; i < authlist_len; ++i) { 1827 rpc_authflavor_t flavor; 1828 struct rpcsec_gss_info info; 1829 1830 flavor = authlist[i]; 1831 switch (flavor) { 1832 case RPC_AUTH_UNIX: 1833 tried_auth_unix = true; 1834 break; 1835 case RPC_AUTH_NULL: 1836 auth_null_in_list = true; 1837 continue; 1838 default: 1839 if (rpcauth_get_gssinfo(flavor, &info) != 0) 1840 continue; 1841 /* Fallthrough */ 1842 } 1843 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 1844 args->selected_flavor = flavor; 1845 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1846 if (!IS_ERR(server)) 1847 return server; 1848 } 1849 1850 /* 1851 * Nothing we tried so far worked. At this point, give up if we've 1852 * already tried AUTH_UNIX or if the server's list doesn't contain 1853 * AUTH_NULL 1854 */ 1855 if (tried_auth_unix || !auth_null_in_list) 1856 return server; 1857 1858 /* Last chance! Try AUTH_UNIX */ 1859 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 1860 args->selected_flavor = RPC_AUTH_UNIX; 1861 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1862 } 1863 1864 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1865 struct nfs_mount_info *mount_info, 1866 struct nfs_subversion *nfs_mod) 1867 { 1868 struct nfs_server *server; 1869 1870 if (mount_info->parsed->need_mount) 1871 server = nfs_try_mount_request(mount_info, nfs_mod); 1872 else 1873 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1874 1875 if (IS_ERR(server)) 1876 return ERR_CAST(server); 1877 1878 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1879 } 1880 EXPORT_SYMBOL_GPL(nfs_try_mount); 1881 1882 /* 1883 * Split "dev_name" into "hostname:export_path". 1884 * 1885 * The leftmost colon demarks the split between the server's hostname 1886 * and the export path. If the hostname starts with a left square 1887 * bracket, then it may contain colons. 1888 * 1889 * Note: caller frees hostname and export path, even on error. 1890 */ 1891 static int nfs_parse_devname(const char *dev_name, 1892 char **hostname, size_t maxnamlen, 1893 char **export_path, size_t maxpathlen) 1894 { 1895 size_t len; 1896 char *end; 1897 1898 if (unlikely(!dev_name || !*dev_name)) { 1899 dfprintk(MOUNT, "NFS: device name not specified\n"); 1900 return -EINVAL; 1901 } 1902 1903 /* Is the host name protected with square brakcets? */ 1904 if (*dev_name == '[') { 1905 end = strchr(++dev_name, ']'); 1906 if (end == NULL || end[1] != ':') 1907 goto out_bad_devname; 1908 1909 len = end - dev_name; 1910 end++; 1911 } else { 1912 char *comma; 1913 1914 end = strchr(dev_name, ':'); 1915 if (end == NULL) 1916 goto out_bad_devname; 1917 len = end - dev_name; 1918 1919 /* kill possible hostname list: not supported */ 1920 comma = strchr(dev_name, ','); 1921 if (comma != NULL && comma < end) 1922 len = comma - dev_name; 1923 } 1924 1925 if (len > maxnamlen) 1926 goto out_hostname; 1927 1928 /* N.B. caller will free nfs_server.hostname in all cases */ 1929 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1930 if (*hostname == NULL) 1931 goto out_nomem; 1932 len = strlen(++end); 1933 if (len > maxpathlen) 1934 goto out_path; 1935 *export_path = kstrndup(end, len, GFP_KERNEL); 1936 if (!*export_path) 1937 goto out_nomem; 1938 1939 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1940 return 0; 1941 1942 out_bad_devname: 1943 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1944 return -EINVAL; 1945 1946 out_nomem: 1947 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1948 return -ENOMEM; 1949 1950 out_hostname: 1951 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1952 return -ENAMETOOLONG; 1953 1954 out_path: 1955 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1956 return -ENAMETOOLONG; 1957 } 1958 1959 /* 1960 * Validate the NFS2/NFS3 mount data 1961 * - fills in the mount root filehandle 1962 * 1963 * For option strings, user space handles the following behaviors: 1964 * 1965 * + DNS: mapping server host name to IP address ("addr=" option) 1966 * 1967 * + failure mode: how to behave if a mount request can't be handled 1968 * immediately ("fg/bg" option) 1969 * 1970 * + retry: how often to retry a mount request ("retry=" option) 1971 * 1972 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1973 * mountproto=tcp after mountproto=udp, and so on 1974 */ 1975 static int nfs23_validate_mount_data(void *options, 1976 struct nfs_parsed_mount_data *args, 1977 struct nfs_fh *mntfh, 1978 const char *dev_name) 1979 { 1980 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1981 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1982 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; 1983 1984 if (data == NULL) 1985 goto out_no_data; 1986 1987 args->version = NFS_DEFAULT_VERSION; 1988 switch (data->version) { 1989 case 1: 1990 data->namlen = 0; /* fall through */ 1991 case 2: 1992 data->bsize = 0; /* fall through */ 1993 case 3: 1994 if (data->flags & NFS_MOUNT_VER3) 1995 goto out_no_v3; 1996 data->root.size = NFS2_FHSIZE; 1997 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1998 /* Turn off security negotiation */ 1999 extra_flags |= NFS_MOUNT_SECFLAVOUR; 2000 /* fall through */ 2001 case 4: 2002 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2003 goto out_no_sec; 2004 /* fall through */ 2005 case 5: 2006 memset(data->context, 0, sizeof(data->context)); 2007 /* fall through */ 2008 case 6: 2009 if (data->flags & NFS_MOUNT_VER3) { 2010 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 2011 goto out_invalid_fh; 2012 mntfh->size = data->root.size; 2013 args->version = 3; 2014 } else { 2015 mntfh->size = NFS2_FHSIZE; 2016 args->version = 2; 2017 } 2018 2019 2020 memcpy(mntfh->data, data->root.data, mntfh->size); 2021 if (mntfh->size < sizeof(mntfh->data)) 2022 memset(mntfh->data + mntfh->size, 0, 2023 sizeof(mntfh->data) - mntfh->size); 2024 2025 /* 2026 * Translate to nfs_parsed_mount_data, which nfs_fill_super 2027 * can deal with. 2028 */ 2029 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 2030 args->flags |= extra_flags; 2031 args->rsize = data->rsize; 2032 args->wsize = data->wsize; 2033 args->timeo = data->timeo; 2034 args->retrans = data->retrans; 2035 args->acregmin = data->acregmin; 2036 args->acregmax = data->acregmax; 2037 args->acdirmin = data->acdirmin; 2038 args->acdirmax = data->acdirmax; 2039 args->need_mount = false; 2040 2041 memcpy(sap, &data->addr, sizeof(data->addr)); 2042 args->nfs_server.addrlen = sizeof(data->addr); 2043 args->nfs_server.port = ntohs(data->addr.sin_port); 2044 if (!nfs_verify_server_address(sap)) 2045 goto out_no_address; 2046 2047 if (!(data->flags & NFS_MOUNT_TCP)) 2048 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 2049 /* N.B. caller will free nfs_server.hostname in all cases */ 2050 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 2051 args->namlen = data->namlen; 2052 args->bsize = data->bsize; 2053 2054 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2055 args->selected_flavor = data->pseudoflavor; 2056 else 2057 args->selected_flavor = RPC_AUTH_UNIX; 2058 if (!args->nfs_server.hostname) 2059 goto out_nomem; 2060 2061 if (!(data->flags & NFS_MOUNT_NONLM)) 2062 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 2063 NFS_MOUNT_LOCAL_FCNTL); 2064 else 2065 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 2066 NFS_MOUNT_LOCAL_FCNTL); 2067 /* 2068 * The legacy version 6 binary mount data from userspace has a 2069 * field used only to transport selinux information into the 2070 * the kernel. To continue to support that functionality we 2071 * have a touch of selinux knowledge here in the NFS code. The 2072 * userspace code converted context=blah to just blah so we are 2073 * converting back to the full string selinux understands. 2074 */ 2075 if (data->context[0]){ 2076 #ifdef CONFIG_SECURITY_SELINUX 2077 int rc; 2078 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 2079 rc = security_add_mnt_opt("context", data->context, 2080 strlen(data->context), &args->lsm_opts); 2081 if (rc) 2082 return rc; 2083 #else 2084 return -EINVAL; 2085 #endif 2086 } 2087 2088 break; 2089 default: 2090 return NFS_TEXT_DATA; 2091 } 2092 2093 return 0; 2094 2095 out_no_data: 2096 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2097 return -EINVAL; 2098 2099 out_no_v3: 2100 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2101 data->version); 2102 return -EINVAL; 2103 2104 out_no_sec: 2105 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2106 return -EINVAL; 2107 2108 out_nomem: 2109 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2110 return -ENOMEM; 2111 2112 out_no_address: 2113 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2114 return -EINVAL; 2115 2116 out_invalid_fh: 2117 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2118 return -EINVAL; 2119 } 2120 2121 #if IS_ENABLED(CONFIG_NFS_V4) 2122 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2123 void *options, 2124 struct nfs_parsed_mount_data *args, 2125 struct nfs_fh *mntfh, 2126 const char *dev_name) 2127 { 2128 if (fs_type == &nfs_fs_type) 2129 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2130 return nfs4_validate_mount_data(options, args, dev_name); 2131 } 2132 #else 2133 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2134 void *options, 2135 struct nfs_parsed_mount_data *args, 2136 struct nfs_fh *mntfh, 2137 const char *dev_name) 2138 { 2139 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2140 } 2141 #endif 2142 2143 static int nfs_validate_text_mount_data(void *options, 2144 struct nfs_parsed_mount_data *args, 2145 const char *dev_name) 2146 { 2147 int port = 0; 2148 int max_namelen = PAGE_SIZE; 2149 int max_pathlen = NFS_MAXPATHLEN; 2150 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2151 2152 if (nfs_parse_mount_options((char *)options, args) == 0) 2153 return -EINVAL; 2154 2155 if (!nfs_verify_server_address(sap)) 2156 goto out_no_address; 2157 2158 if (args->version == 4) { 2159 #if IS_ENABLED(CONFIG_NFS_V4) 2160 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA) 2161 port = NFS_RDMA_PORT; 2162 else 2163 port = NFS_PORT; 2164 max_namelen = NFS4_MAXNAMLEN; 2165 max_pathlen = NFS4_MAXPATHLEN; 2166 nfs_validate_transport_protocol(args); 2167 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2168 goto out_invalid_transport_udp; 2169 nfs4_validate_mount_flags(args); 2170 #else 2171 goto out_v4_not_compiled; 2172 #endif /* CONFIG_NFS_V4 */ 2173 } else { 2174 nfs_set_mount_transport_protocol(args); 2175 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA) 2176 port = NFS_RDMA_PORT; 2177 } 2178 2179 nfs_set_port(sap, &args->nfs_server.port, port); 2180 2181 return nfs_parse_devname(dev_name, 2182 &args->nfs_server.hostname, 2183 max_namelen, 2184 &args->nfs_server.export_path, 2185 max_pathlen); 2186 2187 #if !IS_ENABLED(CONFIG_NFS_V4) 2188 out_v4_not_compiled: 2189 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2190 return -EPROTONOSUPPORT; 2191 #else 2192 out_invalid_transport_udp: 2193 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2194 return -EINVAL; 2195 #endif /* !CONFIG_NFS_V4 */ 2196 2197 out_no_address: 2198 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2199 return -EINVAL; 2200 } 2201 2202 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 2203 | NFS_MOUNT_SECURE \ 2204 | NFS_MOUNT_TCP \ 2205 | NFS_MOUNT_VER3 \ 2206 | NFS_MOUNT_KERBEROS \ 2207 | NFS_MOUNT_NONLM \ 2208 | NFS_MOUNT_BROKEN_SUID \ 2209 | NFS_MOUNT_STRICTLOCK \ 2210 | NFS_MOUNT_LEGACY_INTERFACE) 2211 2212 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 2213 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 2214 2215 static int 2216 nfs_compare_remount_data(struct nfs_server *nfss, 2217 struct nfs_parsed_mount_data *data) 2218 { 2219 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 2220 data->rsize != nfss->rsize || 2221 data->wsize != nfss->wsize || 2222 data->version != nfss->nfs_client->rpc_ops->version || 2223 data->minorversion != nfss->nfs_client->cl_minorversion || 2224 data->retrans != nfss->client->cl_timeout->to_retries || 2225 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) || 2226 data->acregmin != nfss->acregmin / HZ || 2227 data->acregmax != nfss->acregmax / HZ || 2228 data->acdirmin != nfss->acdirmin / HZ || 2229 data->acdirmax != nfss->acdirmax / HZ || 2230 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2231 data->nfs_server.port != nfss->port || 2232 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2233 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2234 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2235 return -EINVAL; 2236 2237 return 0; 2238 } 2239 2240 int 2241 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2242 { 2243 int error; 2244 struct nfs_server *nfss = sb->s_fs_info; 2245 struct nfs_parsed_mount_data *data; 2246 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2247 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2248 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2249 2250 sync_filesystem(sb); 2251 2252 /* 2253 * Userspace mount programs that send binary options generally send 2254 * them populated with default values. We have no way to know which 2255 * ones were explicitly specified. Fall back to legacy behavior and 2256 * just return success. 2257 */ 2258 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2259 (nfsvers <= 3 && (!options || (options->version >= 1 && 2260 options->version <= 6)))) 2261 return 0; 2262 2263 data = nfs_alloc_parsed_mount_data(); 2264 if (data == NULL) 2265 return -ENOMEM; 2266 2267 /* fill out struct with values from existing mount */ 2268 data->flags = nfss->flags; 2269 data->rsize = nfss->rsize; 2270 data->wsize = nfss->wsize; 2271 data->retrans = nfss->client->cl_timeout->to_retries; 2272 data->selected_flavor = nfss->client->cl_auth->au_flavor; 2273 data->acregmin = nfss->acregmin / HZ; 2274 data->acregmax = nfss->acregmax / HZ; 2275 data->acdirmin = nfss->acdirmin / HZ; 2276 data->acdirmax = nfss->acdirmax / HZ; 2277 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2278 data->nfs_server.port = nfss->port; 2279 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2280 data->version = nfsvers; 2281 data->minorversion = nfss->nfs_client->cl_minorversion; 2282 data->net = current->nsproxy->net_ns; 2283 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2284 data->nfs_server.addrlen); 2285 2286 /* overwrite those values with any that were specified */ 2287 error = -EINVAL; 2288 if (!nfs_parse_mount_options((char *)options, data)) 2289 goto out; 2290 2291 /* 2292 * noac is a special case. It implies -o sync, but that's not 2293 * necessarily reflected in the mtab options. do_remount_sb 2294 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the 2295 * remount options, so we have to explicitly reset it. 2296 */ 2297 if (data->flags & NFS_MOUNT_NOAC) 2298 *flags |= SB_SYNCHRONOUS; 2299 2300 /* compare new mount options with old ones */ 2301 error = nfs_compare_remount_data(nfss, data); 2302 if (!error) 2303 error = security_sb_remount(sb, data->lsm_opts); 2304 out: 2305 nfs_free_parsed_mount_data(data); 2306 return error; 2307 } 2308 EXPORT_SYMBOL_GPL(nfs_remount); 2309 2310 /* 2311 * Initialise the common bits of the superblock 2312 */ 2313 static void nfs_initialise_sb(struct super_block *sb) 2314 { 2315 struct nfs_server *server = NFS_SB(sb); 2316 2317 sb->s_magic = NFS_SUPER_MAGIC; 2318 2319 /* We probably want something more informative here */ 2320 snprintf(sb->s_id, sizeof(sb->s_id), 2321 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2322 2323 if (sb->s_blocksize == 0) 2324 sb->s_blocksize = nfs_block_bits(server->wsize, 2325 &sb->s_blocksize_bits); 2326 2327 nfs_super_set_maxbytes(sb, server->maxfilesize); 2328 } 2329 2330 /* 2331 * Finish setting up an NFS2/3 superblock 2332 */ 2333 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2334 { 2335 struct nfs_parsed_mount_data *data = mount_info->parsed; 2336 struct nfs_server *server = NFS_SB(sb); 2337 2338 sb->s_blocksize_bits = 0; 2339 sb->s_blocksize = 0; 2340 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2341 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2342 if (data && data->bsize) 2343 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2344 2345 if (server->nfs_client->rpc_ops->version != 2) { 2346 /* The VFS shouldn't apply the umask to mode bits. We will do 2347 * so ourselves when necessary. 2348 */ 2349 sb->s_flags |= SB_POSIXACL; 2350 sb->s_time_gran = 1; 2351 sb->s_export_op = &nfs_export_ops; 2352 } 2353 2354 nfs_initialise_sb(sb); 2355 } 2356 EXPORT_SYMBOL_GPL(nfs_fill_super); 2357 2358 /* 2359 * Finish setting up a cloned NFS2/3/4 superblock 2360 */ 2361 static void nfs_clone_super(struct super_block *sb, 2362 struct nfs_mount_info *mount_info) 2363 { 2364 const struct super_block *old_sb = mount_info->cloned->sb; 2365 struct nfs_server *server = NFS_SB(sb); 2366 2367 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2368 sb->s_blocksize = old_sb->s_blocksize; 2369 sb->s_maxbytes = old_sb->s_maxbytes; 2370 sb->s_xattr = old_sb->s_xattr; 2371 sb->s_op = old_sb->s_op; 2372 sb->s_time_gran = 1; 2373 sb->s_export_op = old_sb->s_export_op; 2374 2375 if (server->nfs_client->rpc_ops->version != 2) { 2376 /* The VFS shouldn't apply the umask to mode bits. We will do 2377 * so ourselves when necessary. 2378 */ 2379 sb->s_flags |= SB_POSIXACL; 2380 } 2381 2382 nfs_initialise_sb(sb); 2383 } 2384 2385 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2386 { 2387 const struct nfs_server *a = s->s_fs_info; 2388 const struct rpc_clnt *clnt_a = a->client; 2389 const struct rpc_clnt *clnt_b = b->client; 2390 2391 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2392 goto Ebusy; 2393 if (a->nfs_client != b->nfs_client) 2394 goto Ebusy; 2395 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 2396 goto Ebusy; 2397 if (a->wsize != b->wsize) 2398 goto Ebusy; 2399 if (a->rsize != b->rsize) 2400 goto Ebusy; 2401 if (a->acregmin != b->acregmin) 2402 goto Ebusy; 2403 if (a->acregmax != b->acregmax) 2404 goto Ebusy; 2405 if (a->acdirmin != b->acdirmin) 2406 goto Ebusy; 2407 if (a->acdirmax != b->acdirmax) 2408 goto Ebusy; 2409 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2410 goto Ebusy; 2411 return 1; 2412 Ebusy: 2413 return 0; 2414 } 2415 2416 struct nfs_sb_mountdata { 2417 struct nfs_server *server; 2418 int mntflags; 2419 }; 2420 2421 static int nfs_set_super(struct super_block *s, void *data) 2422 { 2423 struct nfs_sb_mountdata *sb_mntdata = data; 2424 struct nfs_server *server = sb_mntdata->server; 2425 int ret; 2426 2427 s->s_flags = sb_mntdata->mntflags; 2428 s->s_fs_info = server; 2429 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2430 ret = set_anon_super(s, server); 2431 if (ret == 0) 2432 server->s_dev = s->s_dev; 2433 return ret; 2434 } 2435 2436 static int nfs_compare_super_address(struct nfs_server *server1, 2437 struct nfs_server *server2) 2438 { 2439 struct sockaddr *sap1, *sap2; 2440 struct rpc_xprt *xprt1 = server1->client->cl_xprt; 2441 struct rpc_xprt *xprt2 = server2->client->cl_xprt; 2442 2443 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) 2444 return 0; 2445 2446 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2447 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2448 2449 if (sap1->sa_family != sap2->sa_family) 2450 return 0; 2451 2452 switch (sap1->sa_family) { 2453 case AF_INET: { 2454 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2455 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2456 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2457 return 0; 2458 if (sin1->sin_port != sin2->sin_port) 2459 return 0; 2460 break; 2461 } 2462 case AF_INET6: { 2463 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2464 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2465 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2466 return 0; 2467 if (sin1->sin6_port != sin2->sin6_port) 2468 return 0; 2469 break; 2470 } 2471 default: 2472 return 0; 2473 } 2474 2475 return 1; 2476 } 2477 2478 static int nfs_compare_super(struct super_block *sb, void *data) 2479 { 2480 struct nfs_sb_mountdata *sb_mntdata = data; 2481 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2482 int mntflags = sb_mntdata->mntflags; 2483 2484 if (!nfs_compare_super_address(old, server)) 2485 return 0; 2486 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2487 if (old->flags & NFS_MOUNT_UNSHARED) 2488 return 0; 2489 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2490 return 0; 2491 return nfs_compare_mount_options(sb, server, mntflags); 2492 } 2493 2494 #ifdef CONFIG_NFS_FSCACHE 2495 static void nfs_get_cache_cookie(struct super_block *sb, 2496 struct nfs_parsed_mount_data *parsed, 2497 struct nfs_clone_mount *cloned) 2498 { 2499 struct nfs_server *nfss = NFS_SB(sb); 2500 char *uniq = NULL; 2501 int ulen = 0; 2502 2503 nfss->fscache_key = NULL; 2504 nfss->fscache = NULL; 2505 2506 if (parsed) { 2507 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2508 return; 2509 if (parsed->fscache_uniq) { 2510 uniq = parsed->fscache_uniq; 2511 ulen = strlen(parsed->fscache_uniq); 2512 } 2513 } else if (cloned) { 2514 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2515 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2516 return; 2517 if (mnt_s->fscache_key) { 2518 uniq = mnt_s->fscache_key->key.uniquifier; 2519 ulen = mnt_s->fscache_key->key.uniq_len; 2520 }; 2521 } else 2522 return; 2523 2524 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2525 } 2526 #else 2527 static void nfs_get_cache_cookie(struct super_block *sb, 2528 struct nfs_parsed_mount_data *parsed, 2529 struct nfs_clone_mount *cloned) 2530 { 2531 } 2532 #endif 2533 2534 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2535 struct nfs_mount_info *mount_info) 2536 { 2537 int error; 2538 unsigned long kflags = 0, kflags_out = 0; 2539 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2540 kflags |= SECURITY_LSM_NATIVE_LABELS; 2541 2542 error = security_sb_set_mnt_opts(s, mount_info->parsed->lsm_opts, 2543 kflags, &kflags_out); 2544 if (error) 2545 goto err; 2546 2547 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2548 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2549 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2550 err: 2551 return error; 2552 } 2553 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2554 2555 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2556 struct nfs_mount_info *mount_info) 2557 { 2558 int error; 2559 unsigned long kflags = 0, kflags_out = 0; 2560 2561 /* clone any lsm security options from the parent to the new sb */ 2562 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2563 return -ESTALE; 2564 2565 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2566 kflags |= SECURITY_LSM_NATIVE_LABELS; 2567 2568 error = security_sb_clone_mnt_opts(mount_info->cloned->sb, s, kflags, 2569 &kflags_out); 2570 if (error) 2571 return error; 2572 2573 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2574 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2575 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2576 return 0; 2577 } 2578 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2579 2580 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2581 int flags, const char *dev_name, 2582 struct nfs_mount_info *mount_info, 2583 struct nfs_subversion *nfs_mod) 2584 { 2585 struct super_block *s; 2586 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2587 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2588 struct nfs_sb_mountdata sb_mntdata = { 2589 .mntflags = flags, 2590 .server = server, 2591 }; 2592 int error; 2593 2594 if (server->flags & NFS_MOUNT_UNSHARED) 2595 compare_super = NULL; 2596 2597 /* -o noac implies -o sync */ 2598 if (server->flags & NFS_MOUNT_NOAC) 2599 sb_mntdata.mntflags |= SB_SYNCHRONOUS; 2600 2601 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) 2602 if (mount_info->cloned->sb->s_flags & SB_SYNCHRONOUS) 2603 sb_mntdata.mntflags |= SB_SYNCHRONOUS; 2604 2605 /* Get a superblock - note that we may end up sharing one that already exists */ 2606 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2607 if (IS_ERR(s)) { 2608 mntroot = ERR_CAST(s); 2609 goto out_err_nosb; 2610 } 2611 2612 if (s->s_fs_info != server) { 2613 nfs_free_server(server); 2614 server = NULL; 2615 } else { 2616 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev), 2617 MINOR(server->s_dev)); 2618 if (error) { 2619 mntroot = ERR_PTR(error); 2620 goto error_splat_super; 2621 } 2622 s->s_bdi->ra_pages = server->rpages * NFS_MAX_READAHEAD; 2623 server->super = s; 2624 } 2625 2626 if (!s->s_root) { 2627 /* initial superblock/root creation */ 2628 mount_info->fill_super(s, mount_info); 2629 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2630 if (!(server->flags & NFS_MOUNT_UNSHARED)) 2631 s->s_iflags |= SB_I_MULTIROOT; 2632 } 2633 2634 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2635 if (IS_ERR(mntroot)) 2636 goto error_splat_super; 2637 2638 error = mount_info->set_security(s, mntroot, mount_info); 2639 if (error) 2640 goto error_splat_root; 2641 2642 s->s_flags |= SB_ACTIVE; 2643 2644 out: 2645 return mntroot; 2646 2647 out_err_nosb: 2648 nfs_free_server(server); 2649 goto out; 2650 2651 error_splat_root: 2652 dput(mntroot); 2653 mntroot = ERR_PTR(error); 2654 error_splat_super: 2655 deactivate_locked_super(s); 2656 goto out; 2657 } 2658 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2659 2660 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2661 int flags, const char *dev_name, void *raw_data) 2662 { 2663 struct nfs_mount_info mount_info = { 2664 .fill_super = nfs_fill_super, 2665 .set_security = nfs_set_sb_security, 2666 }; 2667 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2668 struct nfs_subversion *nfs_mod; 2669 int error; 2670 2671 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2672 mount_info.mntfh = nfs_alloc_fhandle(); 2673 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2674 goto out; 2675 2676 /* Validate the mount data */ 2677 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2678 if (error == NFS_TEXT_DATA) 2679 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2680 if (error < 0) { 2681 mntroot = ERR_PTR(error); 2682 goto out; 2683 } 2684 2685 nfs_mod = get_nfs_version(mount_info.parsed->version); 2686 if (IS_ERR(nfs_mod)) { 2687 mntroot = ERR_CAST(nfs_mod); 2688 goto out; 2689 } 2690 2691 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2692 2693 put_nfs_version(nfs_mod); 2694 out: 2695 nfs_free_parsed_mount_data(mount_info.parsed); 2696 nfs_free_fhandle(mount_info.mntfh); 2697 return mntroot; 2698 } 2699 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2700 2701 /* 2702 * Destroy an NFS2/3 superblock 2703 */ 2704 void nfs_kill_super(struct super_block *s) 2705 { 2706 struct nfs_server *server = NFS_SB(s); 2707 dev_t dev = s->s_dev; 2708 2709 generic_shutdown_super(s); 2710 2711 nfs_fscache_release_super_cookie(s); 2712 2713 nfs_free_server(server); 2714 free_anon_bdev(dev); 2715 } 2716 EXPORT_SYMBOL_GPL(nfs_kill_super); 2717 2718 /* 2719 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2720 */ 2721 static struct dentry * 2722 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2723 const char *dev_name, void *raw_data) 2724 { 2725 struct nfs_clone_mount *data = raw_data; 2726 struct nfs_mount_info mount_info = { 2727 .fill_super = nfs_clone_super, 2728 .set_security = nfs_clone_sb_security, 2729 .cloned = data, 2730 }; 2731 struct nfs_server *server; 2732 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2733 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2734 2735 dprintk("--> nfs_xdev_mount()\n"); 2736 2737 mount_info.mntfh = mount_info.cloned->fh; 2738 2739 /* create a new volume representation */ 2740 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2741 2742 if (IS_ERR(server)) 2743 mntroot = ERR_CAST(server); 2744 else 2745 mntroot = nfs_fs_mount_common(server, flags, 2746 dev_name, &mount_info, nfs_mod); 2747 2748 dprintk("<-- nfs_xdev_mount() = %ld\n", 2749 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2750 return mntroot; 2751 } 2752 2753 #if IS_ENABLED(CONFIG_NFS_V4) 2754 2755 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2756 { 2757 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2758 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2759 } 2760 2761 /* 2762 * Validate NFSv4 mount options 2763 */ 2764 static int nfs4_validate_mount_data(void *options, 2765 struct nfs_parsed_mount_data *args, 2766 const char *dev_name) 2767 { 2768 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2769 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2770 char *c; 2771 2772 if (data == NULL) 2773 goto out_no_data; 2774 2775 args->version = 4; 2776 2777 switch (data->version) { 2778 case 1: 2779 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2780 goto out_no_address; 2781 if (data->host_addrlen == 0) 2782 goto out_no_address; 2783 args->nfs_server.addrlen = data->host_addrlen; 2784 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2785 return -EFAULT; 2786 if (!nfs_verify_server_address(sap)) 2787 goto out_no_address; 2788 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2789 2790 if (data->auth_flavourlen) { 2791 rpc_authflavor_t pseudoflavor; 2792 if (data->auth_flavourlen > 1) 2793 goto out_inval_auth; 2794 if (copy_from_user(&pseudoflavor, 2795 data->auth_flavours, 2796 sizeof(pseudoflavor))) 2797 return -EFAULT; 2798 args->selected_flavor = pseudoflavor; 2799 } else 2800 args->selected_flavor = RPC_AUTH_UNIX; 2801 2802 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2803 if (IS_ERR(c)) 2804 return PTR_ERR(c); 2805 args->nfs_server.hostname = c; 2806 2807 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2808 if (IS_ERR(c)) 2809 return PTR_ERR(c); 2810 args->nfs_server.export_path = c; 2811 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2812 2813 c = strndup_user(data->client_addr.data, 16); 2814 if (IS_ERR(c)) 2815 return PTR_ERR(c); 2816 args->client_address = c; 2817 2818 /* 2819 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2820 * can deal with. 2821 */ 2822 2823 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2824 args->rsize = data->rsize; 2825 args->wsize = data->wsize; 2826 args->timeo = data->timeo; 2827 args->retrans = data->retrans; 2828 args->acregmin = data->acregmin; 2829 args->acregmax = data->acregmax; 2830 args->acdirmin = data->acdirmin; 2831 args->acdirmax = data->acdirmax; 2832 args->nfs_server.protocol = data->proto; 2833 nfs_validate_transport_protocol(args); 2834 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2835 goto out_invalid_transport_udp; 2836 2837 break; 2838 default: 2839 return NFS_TEXT_DATA; 2840 } 2841 2842 return 0; 2843 2844 out_no_data: 2845 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2846 return -EINVAL; 2847 2848 out_inval_auth: 2849 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2850 data->auth_flavourlen); 2851 return -EINVAL; 2852 2853 out_no_address: 2854 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2855 return -EINVAL; 2856 2857 out_invalid_transport_udp: 2858 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2859 return -EINVAL; 2860 } 2861 2862 /* 2863 * NFS v4 module parameters need to stay in the 2864 * NFS client for backwards compatibility 2865 */ 2866 unsigned int nfs_callback_set_tcpport; 2867 unsigned short nfs_callback_nr_threads; 2868 /* Default cache timeout is 10 minutes */ 2869 unsigned int nfs_idmap_cache_timeout = 600; 2870 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2871 bool nfs4_disable_idmapping = true; 2872 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2873 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE; 2874 unsigned short send_implementation_id = 1; 2875 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2876 bool recover_lost_locks = false; 2877 2878 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads); 2879 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2880 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2881 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2882 EXPORT_SYMBOL_GPL(max_session_slots); 2883 EXPORT_SYMBOL_GPL(max_session_cb_slots); 2884 EXPORT_SYMBOL_GPL(send_implementation_id); 2885 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2886 EXPORT_SYMBOL_GPL(recover_lost_locks); 2887 2888 #define NFS_CALLBACK_MAXPORTNR (65535U) 2889 2890 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2891 { 2892 unsigned long num; 2893 int ret; 2894 2895 if (!val) 2896 return -EINVAL; 2897 ret = kstrtoul(val, 0, &num); 2898 if (ret || num > NFS_CALLBACK_MAXPORTNR) 2899 return -EINVAL; 2900 *((unsigned int *)kp->arg) = num; 2901 return 0; 2902 } 2903 static const struct kernel_param_ops param_ops_portnr = { 2904 .set = param_set_portnr, 2905 .get = param_get_uint, 2906 }; 2907 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2908 2909 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2910 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644); 2911 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be " 2912 "assigned to the NFSv4 callback channels."); 2913 module_param(nfs_idmap_cache_timeout, int, 0644); 2914 module_param(nfs4_disable_idmapping, bool, 0644); 2915 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2916 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2917 MODULE_PARM_DESC(nfs4_disable_idmapping, 2918 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2919 module_param(max_session_slots, ushort, 0644); 2920 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2921 "requests the client will negotiate"); 2922 module_param(max_session_cb_slots, ushort, 0644); 2923 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 " 2924 "callbacks the client will process for a given server"); 2925 module_param(send_implementation_id, ushort, 0644); 2926 MODULE_PARM_DESC(send_implementation_id, 2927 "Send implementation ID with NFSv4.1 exchange_id"); 2928 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2929 2930 module_param(recover_lost_locks, bool, 0644); 2931 MODULE_PARM_DESC(recover_lost_locks, 2932 "If the server reports that a lock might be lost, " 2933 "try to recover it risking data corruption."); 2934 2935 2936 #endif /* CONFIG_NFS_V4 */ 2937