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