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 = 1; 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 /* 1022 * Parse the value of the 'sec=' option. 1023 */ 1024 static int nfs_parse_security_flavors(char *value, 1025 struct nfs_parsed_mount_data *mnt) 1026 { 1027 substring_t args[MAX_OPT_ARGS]; 1028 1029 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1030 1031 switch (match_token(value, nfs_secflavor_tokens, args)) { 1032 case Opt_sec_none: 1033 mnt->auth_flavors[0] = RPC_AUTH_NULL; 1034 break; 1035 case Opt_sec_sys: 1036 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 1037 break; 1038 case Opt_sec_krb5: 1039 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 1040 break; 1041 case Opt_sec_krb5i: 1042 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 1043 break; 1044 case Opt_sec_krb5p: 1045 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 1046 break; 1047 case Opt_sec_lkey: 1048 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 1049 break; 1050 case Opt_sec_lkeyi: 1051 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 1052 break; 1053 case Opt_sec_lkeyp: 1054 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 1055 break; 1056 case Opt_sec_spkm: 1057 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 1058 break; 1059 case Opt_sec_spkmi: 1060 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 1061 break; 1062 case Opt_sec_spkmp: 1063 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 1064 break; 1065 default: 1066 return 0; 1067 } 1068 1069 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 1070 mnt->auth_flavor_len = 1; 1071 return 1; 1072 } 1073 1074 static int nfs_parse_version_string(char *string, 1075 struct nfs_parsed_mount_data *mnt, 1076 substring_t *args) 1077 { 1078 mnt->flags &= ~NFS_MOUNT_VER3; 1079 switch (match_token(string, nfs_vers_tokens, args)) { 1080 case Opt_vers_2: 1081 mnt->version = 2; 1082 break; 1083 case Opt_vers_3: 1084 mnt->flags |= NFS_MOUNT_VER3; 1085 mnt->version = 3; 1086 break; 1087 case Opt_vers_4: 1088 /* Backward compatibility option. In future, 1089 * the mount program should always supply 1090 * a NFSv4 minor version number. 1091 */ 1092 mnt->version = 4; 1093 break; 1094 case Opt_vers_4_0: 1095 mnt->version = 4; 1096 mnt->minorversion = 0; 1097 break; 1098 case Opt_vers_4_1: 1099 mnt->version = 4; 1100 mnt->minorversion = 1; 1101 break; 1102 case Opt_vers_4_2: 1103 mnt->version = 4; 1104 mnt->minorversion = 2; 1105 break; 1106 default: 1107 return 0; 1108 } 1109 return 1; 1110 } 1111 1112 static int nfs_get_option_str(substring_t args[], char **option) 1113 { 1114 kfree(*option); 1115 *option = match_strdup(args); 1116 return !*option; 1117 } 1118 1119 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1120 { 1121 int rc; 1122 char *string; 1123 1124 string = match_strdup(args); 1125 if (string == NULL) 1126 return -ENOMEM; 1127 rc = kstrtoul(string, 10, option); 1128 kfree(string); 1129 1130 return rc; 1131 } 1132 1133 /* 1134 * Error-check and convert a string of mount options from user space into 1135 * a data structure. The whole mount string is processed; bad options are 1136 * skipped as they are encountered. If there were no errors, return 1; 1137 * otherwise return 0 (zero). 1138 */ 1139 static int nfs_parse_mount_options(char *raw, 1140 struct nfs_parsed_mount_data *mnt) 1141 { 1142 char *p, *string, *secdata; 1143 int rc, sloppy = 0, invalid_option = 0; 1144 unsigned short protofamily = AF_UNSPEC; 1145 unsigned short mountfamily = AF_UNSPEC; 1146 1147 if (!raw) { 1148 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1149 return 1; 1150 } 1151 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1152 1153 secdata = alloc_secdata(); 1154 if (!secdata) 1155 goto out_nomem; 1156 1157 rc = security_sb_copy_data(raw, secdata); 1158 if (rc) 1159 goto out_security_failure; 1160 1161 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1162 if (rc) 1163 goto out_security_failure; 1164 1165 free_secdata(secdata); 1166 1167 while ((p = strsep(&raw, ",")) != NULL) { 1168 substring_t args[MAX_OPT_ARGS]; 1169 unsigned long option; 1170 int token; 1171 1172 if (!*p) 1173 continue; 1174 1175 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1176 1177 token = match_token(p, nfs_mount_option_tokens, args); 1178 switch (token) { 1179 1180 /* 1181 * boolean options: foo/nofoo 1182 */ 1183 case Opt_soft: 1184 mnt->flags |= NFS_MOUNT_SOFT; 1185 break; 1186 case Opt_hard: 1187 mnt->flags &= ~NFS_MOUNT_SOFT; 1188 break; 1189 case Opt_posix: 1190 mnt->flags |= NFS_MOUNT_POSIX; 1191 break; 1192 case Opt_noposix: 1193 mnt->flags &= ~NFS_MOUNT_POSIX; 1194 break; 1195 case Opt_cto: 1196 mnt->flags &= ~NFS_MOUNT_NOCTO; 1197 break; 1198 case Opt_nocto: 1199 mnt->flags |= NFS_MOUNT_NOCTO; 1200 break; 1201 case Opt_ac: 1202 mnt->flags &= ~NFS_MOUNT_NOAC; 1203 break; 1204 case Opt_noac: 1205 mnt->flags |= NFS_MOUNT_NOAC; 1206 break; 1207 case Opt_lock: 1208 mnt->flags &= ~NFS_MOUNT_NONLM; 1209 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1210 NFS_MOUNT_LOCAL_FCNTL); 1211 break; 1212 case Opt_nolock: 1213 mnt->flags |= NFS_MOUNT_NONLM; 1214 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1215 NFS_MOUNT_LOCAL_FCNTL); 1216 break; 1217 case Opt_udp: 1218 mnt->flags &= ~NFS_MOUNT_TCP; 1219 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1220 break; 1221 case Opt_tcp: 1222 mnt->flags |= NFS_MOUNT_TCP; 1223 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1224 break; 1225 case Opt_rdma: 1226 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1227 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1228 xprt_load_transport(p); 1229 break; 1230 case Opt_acl: 1231 mnt->flags &= ~NFS_MOUNT_NOACL; 1232 break; 1233 case Opt_noacl: 1234 mnt->flags |= NFS_MOUNT_NOACL; 1235 break; 1236 case Opt_rdirplus: 1237 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1238 break; 1239 case Opt_nordirplus: 1240 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1241 break; 1242 case Opt_sharecache: 1243 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1244 break; 1245 case Opt_nosharecache: 1246 mnt->flags |= NFS_MOUNT_UNSHARED; 1247 break; 1248 case Opt_resvport: 1249 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1250 break; 1251 case Opt_noresvport: 1252 mnt->flags |= NFS_MOUNT_NORESVPORT; 1253 break; 1254 case Opt_fscache: 1255 mnt->options |= NFS_OPTION_FSCACHE; 1256 kfree(mnt->fscache_uniq); 1257 mnt->fscache_uniq = NULL; 1258 break; 1259 case Opt_nofscache: 1260 mnt->options &= ~NFS_OPTION_FSCACHE; 1261 kfree(mnt->fscache_uniq); 1262 mnt->fscache_uniq = NULL; 1263 break; 1264 case Opt_migration: 1265 mnt->options |= NFS_OPTION_MIGRATION; 1266 break; 1267 case Opt_nomigration: 1268 mnt->options &= NFS_OPTION_MIGRATION; 1269 break; 1270 1271 /* 1272 * options that take numeric values 1273 */ 1274 case Opt_port: 1275 if (nfs_get_option_ul(args, &option) || 1276 option > USHRT_MAX) 1277 goto out_invalid_value; 1278 mnt->nfs_server.port = option; 1279 break; 1280 case Opt_rsize: 1281 if (nfs_get_option_ul(args, &option)) 1282 goto out_invalid_value; 1283 mnt->rsize = option; 1284 break; 1285 case Opt_wsize: 1286 if (nfs_get_option_ul(args, &option)) 1287 goto out_invalid_value; 1288 mnt->wsize = option; 1289 break; 1290 case Opt_bsize: 1291 if (nfs_get_option_ul(args, &option)) 1292 goto out_invalid_value; 1293 mnt->bsize = option; 1294 break; 1295 case Opt_timeo: 1296 if (nfs_get_option_ul(args, &option) || option == 0) 1297 goto out_invalid_value; 1298 mnt->timeo = option; 1299 break; 1300 case Opt_retrans: 1301 if (nfs_get_option_ul(args, &option) || option == 0) 1302 goto out_invalid_value; 1303 mnt->retrans = option; 1304 break; 1305 case Opt_acregmin: 1306 if (nfs_get_option_ul(args, &option)) 1307 goto out_invalid_value; 1308 mnt->acregmin = option; 1309 break; 1310 case Opt_acregmax: 1311 if (nfs_get_option_ul(args, &option)) 1312 goto out_invalid_value; 1313 mnt->acregmax = option; 1314 break; 1315 case Opt_acdirmin: 1316 if (nfs_get_option_ul(args, &option)) 1317 goto out_invalid_value; 1318 mnt->acdirmin = option; 1319 break; 1320 case Opt_acdirmax: 1321 if (nfs_get_option_ul(args, &option)) 1322 goto out_invalid_value; 1323 mnt->acdirmax = option; 1324 break; 1325 case Opt_actimeo: 1326 if (nfs_get_option_ul(args, &option)) 1327 goto out_invalid_value; 1328 mnt->acregmin = mnt->acregmax = 1329 mnt->acdirmin = mnt->acdirmax = option; 1330 break; 1331 case Opt_namelen: 1332 if (nfs_get_option_ul(args, &option)) 1333 goto out_invalid_value; 1334 mnt->namlen = option; 1335 break; 1336 case Opt_mountport: 1337 if (nfs_get_option_ul(args, &option) || 1338 option > USHRT_MAX) 1339 goto out_invalid_value; 1340 mnt->mount_server.port = option; 1341 break; 1342 case Opt_mountvers: 1343 if (nfs_get_option_ul(args, &option) || 1344 option < NFS_MNT_VERSION || 1345 option > NFS_MNT3_VERSION) 1346 goto out_invalid_value; 1347 mnt->mount_server.version = option; 1348 break; 1349 case Opt_minorversion: 1350 if (nfs_get_option_ul(args, &option)) 1351 goto out_invalid_value; 1352 if (option > NFS4_MAX_MINOR_VERSION) 1353 goto out_invalid_value; 1354 mnt->minorversion = option; 1355 break; 1356 1357 /* 1358 * options that take text values 1359 */ 1360 case Opt_nfsvers: 1361 string = match_strdup(args); 1362 if (string == NULL) 1363 goto out_nomem; 1364 rc = nfs_parse_version_string(string, mnt, args); 1365 kfree(string); 1366 if (!rc) 1367 goto out_invalid_value; 1368 break; 1369 case Opt_sec: 1370 string = match_strdup(args); 1371 if (string == NULL) 1372 goto out_nomem; 1373 rc = nfs_parse_security_flavors(string, mnt); 1374 kfree(string); 1375 if (!rc) { 1376 dfprintk(MOUNT, "NFS: unrecognized " 1377 "security flavor\n"); 1378 return 0; 1379 } 1380 break; 1381 case Opt_proto: 1382 string = match_strdup(args); 1383 if (string == NULL) 1384 goto out_nomem; 1385 token = match_token(string, 1386 nfs_xprt_protocol_tokens, args); 1387 1388 protofamily = AF_INET; 1389 switch (token) { 1390 case Opt_xprt_udp6: 1391 protofamily = AF_INET6; 1392 case Opt_xprt_udp: 1393 mnt->flags &= ~NFS_MOUNT_TCP; 1394 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1395 break; 1396 case Opt_xprt_tcp6: 1397 protofamily = AF_INET6; 1398 case Opt_xprt_tcp: 1399 mnt->flags |= NFS_MOUNT_TCP; 1400 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1401 break; 1402 case Opt_xprt_rdma: 1403 /* vector side protocols to TCP */ 1404 mnt->flags |= NFS_MOUNT_TCP; 1405 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1406 xprt_load_transport(string); 1407 break; 1408 default: 1409 dfprintk(MOUNT, "NFS: unrecognized " 1410 "transport protocol\n"); 1411 kfree(string); 1412 return 0; 1413 } 1414 kfree(string); 1415 break; 1416 case Opt_mountproto: 1417 string = match_strdup(args); 1418 if (string == NULL) 1419 goto out_nomem; 1420 token = match_token(string, 1421 nfs_xprt_protocol_tokens, args); 1422 kfree(string); 1423 1424 mountfamily = AF_INET; 1425 switch (token) { 1426 case Opt_xprt_udp6: 1427 mountfamily = AF_INET6; 1428 case Opt_xprt_udp: 1429 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1430 break; 1431 case Opt_xprt_tcp6: 1432 mountfamily = AF_INET6; 1433 case Opt_xprt_tcp: 1434 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1435 break; 1436 case Opt_xprt_rdma: /* not used for side protocols */ 1437 default: 1438 dfprintk(MOUNT, "NFS: unrecognized " 1439 "transport protocol\n"); 1440 return 0; 1441 } 1442 break; 1443 case Opt_addr: 1444 string = match_strdup(args); 1445 if (string == NULL) 1446 goto out_nomem; 1447 mnt->nfs_server.addrlen = 1448 rpc_pton(mnt->net, string, strlen(string), 1449 (struct sockaddr *) 1450 &mnt->nfs_server.address, 1451 sizeof(mnt->nfs_server.address)); 1452 kfree(string); 1453 if (mnt->nfs_server.addrlen == 0) 1454 goto out_invalid_address; 1455 break; 1456 case Opt_clientaddr: 1457 if (nfs_get_option_str(args, &mnt->client_address)) 1458 goto out_nomem; 1459 break; 1460 case Opt_mounthost: 1461 if (nfs_get_option_str(args, 1462 &mnt->mount_server.hostname)) 1463 goto out_nomem; 1464 break; 1465 case Opt_mountaddr: 1466 string = match_strdup(args); 1467 if (string == NULL) 1468 goto out_nomem; 1469 mnt->mount_server.addrlen = 1470 rpc_pton(mnt->net, string, strlen(string), 1471 (struct sockaddr *) 1472 &mnt->mount_server.address, 1473 sizeof(mnt->mount_server.address)); 1474 kfree(string); 1475 if (mnt->mount_server.addrlen == 0) 1476 goto out_invalid_address; 1477 break; 1478 case Opt_lookupcache: 1479 string = match_strdup(args); 1480 if (string == NULL) 1481 goto out_nomem; 1482 token = match_token(string, 1483 nfs_lookupcache_tokens, args); 1484 kfree(string); 1485 switch (token) { 1486 case Opt_lookupcache_all: 1487 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1488 break; 1489 case Opt_lookupcache_positive: 1490 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1491 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1492 break; 1493 case Opt_lookupcache_none: 1494 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1495 break; 1496 default: 1497 dfprintk(MOUNT, "NFS: invalid " 1498 "lookupcache argument\n"); 1499 return 0; 1500 }; 1501 break; 1502 case Opt_fscache_uniq: 1503 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1504 goto out_nomem; 1505 mnt->options |= NFS_OPTION_FSCACHE; 1506 break; 1507 case Opt_local_lock: 1508 string = match_strdup(args); 1509 if (string == NULL) 1510 goto out_nomem; 1511 token = match_token(string, nfs_local_lock_tokens, 1512 args); 1513 kfree(string); 1514 switch (token) { 1515 case Opt_local_lock_all: 1516 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1517 NFS_MOUNT_LOCAL_FCNTL); 1518 break; 1519 case Opt_local_lock_flock: 1520 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1521 break; 1522 case Opt_local_lock_posix: 1523 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1524 break; 1525 case Opt_local_lock_none: 1526 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1527 NFS_MOUNT_LOCAL_FCNTL); 1528 break; 1529 default: 1530 dfprintk(MOUNT, "NFS: invalid " 1531 "local_lock argument\n"); 1532 return 0; 1533 }; 1534 break; 1535 1536 /* 1537 * Special options 1538 */ 1539 case Opt_sloppy: 1540 sloppy = 1; 1541 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1542 break; 1543 case Opt_userspace: 1544 case Opt_deprecated: 1545 dfprintk(MOUNT, "NFS: ignoring mount option " 1546 "'%s'\n", p); 1547 break; 1548 1549 default: 1550 invalid_option = 1; 1551 dfprintk(MOUNT, "NFS: unrecognized mount option " 1552 "'%s'\n", p); 1553 } 1554 } 1555 1556 if (!sloppy && invalid_option) 1557 return 0; 1558 1559 if (mnt->minorversion && mnt->version != 4) 1560 goto out_minorversion_mismatch; 1561 1562 if (mnt->options & NFS_OPTION_MIGRATION && 1563 mnt->version != 4 && mnt->minorversion != 0) 1564 goto out_migration_misuse; 1565 1566 /* 1567 * verify that any proto=/mountproto= options match the address 1568 * families in the addr=/mountaddr= options. 1569 */ 1570 if (protofamily != AF_UNSPEC && 1571 protofamily != mnt->nfs_server.address.ss_family) 1572 goto out_proto_mismatch; 1573 1574 if (mountfamily != AF_UNSPEC) { 1575 if (mnt->mount_server.addrlen) { 1576 if (mountfamily != mnt->mount_server.address.ss_family) 1577 goto out_mountproto_mismatch; 1578 } else { 1579 if (mountfamily != mnt->nfs_server.address.ss_family) 1580 goto out_mountproto_mismatch; 1581 } 1582 } 1583 1584 return 1; 1585 1586 out_mountproto_mismatch: 1587 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1588 "option\n"); 1589 return 0; 1590 out_proto_mismatch: 1591 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1592 return 0; 1593 out_invalid_address: 1594 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1595 return 0; 1596 out_invalid_value: 1597 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1598 return 0; 1599 out_minorversion_mismatch: 1600 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1601 "minorversion=%u\n", mnt->version, mnt->minorversion); 1602 return 0; 1603 out_migration_misuse: 1604 printk(KERN_INFO 1605 "NFS: 'migration' not supported for this NFS version\n"); 1606 return 0; 1607 out_nomem: 1608 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1609 return 0; 1610 out_security_failure: 1611 free_secdata(secdata); 1612 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1613 return 0; 1614 } 1615 1616 /* 1617 * Ensure that the specified authtype in args->auth_flavors[0] is supported by 1618 * the server. Returns 0 if it's ok, and -EACCES if not. 1619 */ 1620 static int nfs_verify_authflavor(struct nfs_parsed_mount_data *args, 1621 rpc_authflavor_t *server_authlist, unsigned int count) 1622 { 1623 unsigned int i; 1624 1625 /* 1626 * If the sec= mount option is used, the specified flavor or AUTH_NULL 1627 * must be in the list returned by the server. 1628 * 1629 * AUTH_NULL has a special meaning when it's in the server list - it 1630 * means that the server will ignore the rpc creds, so any flavor 1631 * can be used. 1632 */ 1633 for (i = 0; i < count; i++) { 1634 if (args->auth_flavors[0] == server_authlist[i] || 1635 server_authlist[i] == RPC_AUTH_NULL) 1636 goto out; 1637 } 1638 1639 dfprintk(MOUNT, "NFS: auth flavor %u not supported by server\n", 1640 args->auth_flavors[0]); 1641 return -EACCES; 1642 1643 out: 1644 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]); 1645 return 0; 1646 } 1647 1648 /* 1649 * Use the remote server's MOUNT service to request the NFS file handle 1650 * corresponding to the provided path. 1651 */ 1652 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1653 struct nfs_fh *root_fh, 1654 rpc_authflavor_t *server_authlist, 1655 unsigned int *server_authlist_len) 1656 { 1657 struct nfs_mount_request request = { 1658 .sap = (struct sockaddr *) 1659 &args->mount_server.address, 1660 .dirpath = args->nfs_server.export_path, 1661 .protocol = args->mount_server.protocol, 1662 .fh = root_fh, 1663 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1664 .auth_flav_len = server_authlist_len, 1665 .auth_flavs = server_authlist, 1666 .net = args->net, 1667 }; 1668 int status; 1669 1670 if (args->mount_server.version == 0) { 1671 switch (args->version) { 1672 default: 1673 args->mount_server.version = NFS_MNT3_VERSION; 1674 break; 1675 case 2: 1676 args->mount_server.version = NFS_MNT_VERSION; 1677 } 1678 } 1679 request.version = args->mount_server.version; 1680 1681 if (args->mount_server.hostname) 1682 request.hostname = args->mount_server.hostname; 1683 else 1684 request.hostname = args->nfs_server.hostname; 1685 1686 /* 1687 * Construct the mount server's address. 1688 */ 1689 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1690 memcpy(request.sap, &args->nfs_server.address, 1691 args->nfs_server.addrlen); 1692 args->mount_server.addrlen = args->nfs_server.addrlen; 1693 } 1694 request.salen = args->mount_server.addrlen; 1695 nfs_set_port(request.sap, &args->mount_server.port, 0); 1696 1697 /* 1698 * Now ask the mount server to map our export path 1699 * to a file handle. 1700 */ 1701 status = nfs_mount(&request); 1702 if (status != 0) { 1703 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1704 request.hostname, status); 1705 return status; 1706 } 1707 1708 return 0; 1709 } 1710 1711 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, 1712 struct nfs_subversion *nfs_mod) 1713 { 1714 int status; 1715 unsigned int i; 1716 bool tried_auth_unix = false; 1717 bool auth_null_in_list = false; 1718 struct nfs_server *server = ERR_PTR(-EACCES); 1719 struct nfs_parsed_mount_data *args = mount_info->parsed; 1720 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 1721 unsigned int authlist_len = ARRAY_SIZE(authlist); 1722 1723 status = nfs_request_mount(args, mount_info->mntfh, authlist, 1724 &authlist_len); 1725 if (status) 1726 return ERR_PTR(status); 1727 1728 /* 1729 * Was a sec= authflavor specified in the options? First, verify 1730 * whether the server supports it, and then just try to use it if so. 1731 */ 1732 if (args->auth_flavors[0] != RPC_AUTH_MAXFLAVOR) { 1733 status = nfs_verify_authflavor(args, authlist, authlist_len); 1734 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]); 1735 if (status) 1736 return ERR_PTR(status); 1737 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1738 } 1739 1740 /* 1741 * No sec= option was provided. RFC 2623, section 2.7 suggests we 1742 * SHOULD prefer the flavor listed first. However, some servers list 1743 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 1744 */ 1745 for (i = 0; i < authlist_len; ++i) { 1746 rpc_authflavor_t flavor; 1747 struct rpcsec_gss_info info; 1748 1749 flavor = authlist[i]; 1750 switch (flavor) { 1751 case RPC_AUTH_UNIX: 1752 tried_auth_unix = true; 1753 break; 1754 case RPC_AUTH_NULL: 1755 auth_null_in_list = true; 1756 continue; 1757 default: 1758 if (rpcauth_get_gssinfo(flavor, &info) != 0) 1759 continue; 1760 /* Fallthrough */ 1761 } 1762 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 1763 args->auth_flavors[0] = flavor; 1764 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1765 if (!IS_ERR(server)) 1766 return server; 1767 } 1768 1769 /* 1770 * Nothing we tried so far worked. At this point, give up if we've 1771 * already tried AUTH_UNIX or if the server's list doesn't contain 1772 * AUTH_NULL 1773 */ 1774 if (tried_auth_unix || !auth_null_in_list) 1775 return server; 1776 1777 /* Last chance! Try AUTH_UNIX */ 1778 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 1779 args->auth_flavors[0] = RPC_AUTH_UNIX; 1780 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1781 } 1782 1783 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1784 struct nfs_mount_info *mount_info, 1785 struct nfs_subversion *nfs_mod) 1786 { 1787 struct nfs_server *server; 1788 1789 if (mount_info->parsed->need_mount) 1790 server = nfs_try_mount_request(mount_info, nfs_mod); 1791 else 1792 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1793 1794 if (IS_ERR(server)) 1795 return ERR_CAST(server); 1796 1797 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1798 } 1799 EXPORT_SYMBOL_GPL(nfs_try_mount); 1800 1801 /* 1802 * Split "dev_name" into "hostname:export_path". 1803 * 1804 * The leftmost colon demarks the split between the server's hostname 1805 * and the export path. If the hostname starts with a left square 1806 * bracket, then it may contain colons. 1807 * 1808 * Note: caller frees hostname and export path, even on error. 1809 */ 1810 static int nfs_parse_devname(const char *dev_name, 1811 char **hostname, size_t maxnamlen, 1812 char **export_path, size_t maxpathlen) 1813 { 1814 size_t len; 1815 char *end; 1816 1817 /* Is the host name protected with square brakcets? */ 1818 if (*dev_name == '[') { 1819 end = strchr(++dev_name, ']'); 1820 if (end == NULL || end[1] != ':') 1821 goto out_bad_devname; 1822 1823 len = end - dev_name; 1824 end++; 1825 } else { 1826 char *comma; 1827 1828 end = strchr(dev_name, ':'); 1829 if (end == NULL) 1830 goto out_bad_devname; 1831 len = end - dev_name; 1832 1833 /* kill possible hostname list: not supported */ 1834 comma = strchr(dev_name, ','); 1835 if (comma != NULL && comma < end) 1836 *comma = 0; 1837 } 1838 1839 if (len > maxnamlen) 1840 goto out_hostname; 1841 1842 /* N.B. caller will free nfs_server.hostname in all cases */ 1843 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1844 if (*hostname == NULL) 1845 goto out_nomem; 1846 len = strlen(++end); 1847 if (len > maxpathlen) 1848 goto out_path; 1849 *export_path = kstrndup(end, len, GFP_KERNEL); 1850 if (!*export_path) 1851 goto out_nomem; 1852 1853 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1854 return 0; 1855 1856 out_bad_devname: 1857 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1858 return -EINVAL; 1859 1860 out_nomem: 1861 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1862 return -ENOMEM; 1863 1864 out_hostname: 1865 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1866 return -ENAMETOOLONG; 1867 1868 out_path: 1869 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1870 return -ENAMETOOLONG; 1871 } 1872 1873 /* 1874 * Validate the NFS2/NFS3 mount data 1875 * - fills in the mount root filehandle 1876 * 1877 * For option strings, user space handles the following behaviors: 1878 * 1879 * + DNS: mapping server host name to IP address ("addr=" option) 1880 * 1881 * + failure mode: how to behave if a mount request can't be handled 1882 * immediately ("fg/bg" option) 1883 * 1884 * + retry: how often to retry a mount request ("retry=" option) 1885 * 1886 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1887 * mountproto=tcp after mountproto=udp, and so on 1888 */ 1889 static int nfs23_validate_mount_data(void *options, 1890 struct nfs_parsed_mount_data *args, 1891 struct nfs_fh *mntfh, 1892 const char *dev_name) 1893 { 1894 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1895 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1896 1897 if (data == NULL) 1898 goto out_no_data; 1899 1900 args->version = NFS_DEFAULT_VERSION; 1901 switch (data->version) { 1902 case 1: 1903 data->namlen = 0; 1904 case 2: 1905 data->bsize = 0; 1906 case 3: 1907 if (data->flags & NFS_MOUNT_VER3) 1908 goto out_no_v3; 1909 data->root.size = NFS2_FHSIZE; 1910 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1911 case 4: 1912 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1913 goto out_no_sec; 1914 case 5: 1915 memset(data->context, 0, sizeof(data->context)); 1916 case 6: 1917 if (data->flags & NFS_MOUNT_VER3) { 1918 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1919 goto out_invalid_fh; 1920 mntfh->size = data->root.size; 1921 args->version = 3; 1922 } else { 1923 mntfh->size = NFS2_FHSIZE; 1924 args->version = 2; 1925 } 1926 1927 1928 memcpy(mntfh->data, data->root.data, mntfh->size); 1929 if (mntfh->size < sizeof(mntfh->data)) 1930 memset(mntfh->data + mntfh->size, 0, 1931 sizeof(mntfh->data) - mntfh->size); 1932 1933 /* 1934 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1935 * can deal with. 1936 */ 1937 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1938 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1939 args->rsize = data->rsize; 1940 args->wsize = data->wsize; 1941 args->timeo = data->timeo; 1942 args->retrans = data->retrans; 1943 args->acregmin = data->acregmin; 1944 args->acregmax = data->acregmax; 1945 args->acdirmin = data->acdirmin; 1946 args->acdirmax = data->acdirmax; 1947 args->need_mount = false; 1948 1949 memcpy(sap, &data->addr, sizeof(data->addr)); 1950 args->nfs_server.addrlen = sizeof(data->addr); 1951 args->nfs_server.port = ntohs(data->addr.sin_port); 1952 if (!nfs_verify_server_address(sap)) 1953 goto out_no_address; 1954 1955 if (!(data->flags & NFS_MOUNT_TCP)) 1956 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1957 /* N.B. caller will free nfs_server.hostname in all cases */ 1958 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1959 args->namlen = data->namlen; 1960 args->bsize = data->bsize; 1961 1962 args->auth_flavors[0] = RPC_AUTH_UNIX; 1963 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1964 args->auth_flavors[0] = data->pseudoflavor; 1965 if (!args->nfs_server.hostname) 1966 goto out_nomem; 1967 1968 if (!(data->flags & NFS_MOUNT_NONLM)) 1969 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1970 NFS_MOUNT_LOCAL_FCNTL); 1971 else 1972 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1973 NFS_MOUNT_LOCAL_FCNTL); 1974 /* 1975 * The legacy version 6 binary mount data from userspace has a 1976 * field used only to transport selinux information into the 1977 * the kernel. To continue to support that functionality we 1978 * have a touch of selinux knowledge here in the NFS code. The 1979 * userspace code converted context=blah to just blah so we are 1980 * converting back to the full string selinux understands. 1981 */ 1982 if (data->context[0]){ 1983 #ifdef CONFIG_SECURITY_SELINUX 1984 int rc; 1985 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1986 if (!opts_str) 1987 return -ENOMEM; 1988 strcpy(opts_str, "context="); 1989 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1990 strcat(opts_str, &data->context[0]); 1991 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1992 kfree(opts_str); 1993 if (rc) 1994 return rc; 1995 #else 1996 return -EINVAL; 1997 #endif 1998 } 1999 2000 break; 2001 default: 2002 return NFS_TEXT_DATA; 2003 } 2004 2005 #if !IS_ENABLED(CONFIG_NFS_V3) 2006 if (args->version == 3) 2007 goto out_v3_not_compiled; 2008 #endif /* !CONFIG_NFS_V3 */ 2009 2010 return 0; 2011 2012 out_no_data: 2013 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2014 return -EINVAL; 2015 2016 out_no_v3: 2017 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2018 data->version); 2019 return -EINVAL; 2020 2021 out_no_sec: 2022 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2023 return -EINVAL; 2024 2025 #if !IS_ENABLED(CONFIG_NFS_V3) 2026 out_v3_not_compiled: 2027 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 2028 return -EPROTONOSUPPORT; 2029 #endif /* !CONFIG_NFS_V3 */ 2030 2031 out_nomem: 2032 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2033 return -ENOMEM; 2034 2035 out_no_address: 2036 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2037 return -EINVAL; 2038 2039 out_invalid_fh: 2040 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2041 return -EINVAL; 2042 } 2043 2044 #if IS_ENABLED(CONFIG_NFS_V4) 2045 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2046 void *options, 2047 struct nfs_parsed_mount_data *args, 2048 struct nfs_fh *mntfh, 2049 const char *dev_name) 2050 { 2051 if (fs_type == &nfs_fs_type) 2052 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2053 return nfs4_validate_mount_data(options, args, dev_name); 2054 } 2055 #else 2056 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2057 void *options, 2058 struct nfs_parsed_mount_data *args, 2059 struct nfs_fh *mntfh, 2060 const char *dev_name) 2061 { 2062 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2063 } 2064 #endif 2065 2066 static int nfs_validate_text_mount_data(void *options, 2067 struct nfs_parsed_mount_data *args, 2068 const char *dev_name) 2069 { 2070 int port = 0; 2071 int max_namelen = PAGE_SIZE; 2072 int max_pathlen = NFS_MAXPATHLEN; 2073 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2074 2075 if (nfs_parse_mount_options((char *)options, args) == 0) 2076 return -EINVAL; 2077 2078 if (!nfs_verify_server_address(sap)) 2079 goto out_no_address; 2080 2081 if (args->version == 4) { 2082 #if IS_ENABLED(CONFIG_NFS_V4) 2083 port = NFS_PORT; 2084 max_namelen = NFS4_MAXNAMLEN; 2085 max_pathlen = NFS4_MAXPATHLEN; 2086 nfs_validate_transport_protocol(args); 2087 nfs4_validate_mount_flags(args); 2088 #else 2089 goto out_v4_not_compiled; 2090 #endif /* CONFIG_NFS_V4 */ 2091 } else 2092 nfs_set_mount_transport_protocol(args); 2093 2094 nfs_set_port(sap, &args->nfs_server.port, port); 2095 2096 if (args->auth_flavor_len > 1) 2097 goto out_bad_auth; 2098 2099 return nfs_parse_devname(dev_name, 2100 &args->nfs_server.hostname, 2101 max_namelen, 2102 &args->nfs_server.export_path, 2103 max_pathlen); 2104 2105 #if !IS_ENABLED(CONFIG_NFS_V4) 2106 out_v4_not_compiled: 2107 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2108 return -EPROTONOSUPPORT; 2109 #endif /* !CONFIG_NFS_V4 */ 2110 2111 out_no_address: 2112 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2113 return -EINVAL; 2114 2115 out_bad_auth: 2116 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n"); 2117 return -EINVAL; 2118 } 2119 2120 static int 2121 nfs_compare_remount_data(struct nfs_server *nfss, 2122 struct nfs_parsed_mount_data *data) 2123 { 2124 if (data->flags != nfss->flags || 2125 data->rsize != nfss->rsize || 2126 data->wsize != nfss->wsize || 2127 data->retrans != nfss->client->cl_timeout->to_retries || 2128 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2129 data->acregmin != nfss->acregmin / HZ || 2130 data->acregmax != nfss->acregmax / HZ || 2131 data->acdirmin != nfss->acdirmin / HZ || 2132 data->acdirmax != nfss->acdirmax / HZ || 2133 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2134 data->nfs_server.port != nfss->port || 2135 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2136 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2137 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2138 return -EINVAL; 2139 2140 return 0; 2141 } 2142 2143 int 2144 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2145 { 2146 int error; 2147 struct nfs_server *nfss = sb->s_fs_info; 2148 struct nfs_parsed_mount_data *data; 2149 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2150 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2151 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2152 2153 /* 2154 * Userspace mount programs that send binary options generally send 2155 * them populated with default values. We have no way to know which 2156 * ones were explicitly specified. Fall back to legacy behavior and 2157 * just return success. 2158 */ 2159 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2160 (nfsvers <= 3 && (!options || (options->version >= 1 && 2161 options->version <= 6)))) 2162 return 0; 2163 2164 data = kzalloc(sizeof(*data), GFP_KERNEL); 2165 if (data == NULL) 2166 return -ENOMEM; 2167 2168 /* fill out struct with values from existing mount */ 2169 data->flags = nfss->flags; 2170 data->rsize = nfss->rsize; 2171 data->wsize = nfss->wsize; 2172 data->retrans = nfss->client->cl_timeout->to_retries; 2173 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2174 data->acregmin = nfss->acregmin / HZ; 2175 data->acregmax = nfss->acregmax / HZ; 2176 data->acdirmin = nfss->acdirmin / HZ; 2177 data->acdirmax = nfss->acdirmax / HZ; 2178 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2179 data->nfs_server.port = nfss->port; 2180 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2181 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2182 data->nfs_server.addrlen); 2183 2184 /* overwrite those values with any that were specified */ 2185 error = nfs_parse_mount_options((char *)options, data); 2186 if (error < 0) 2187 goto out; 2188 2189 /* 2190 * noac is a special case. It implies -o sync, but that's not 2191 * necessarily reflected in the mtab options. do_remount_sb 2192 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2193 * remount options, so we have to explicitly reset it. 2194 */ 2195 if (data->flags & NFS_MOUNT_NOAC) 2196 *flags |= MS_SYNCHRONOUS; 2197 2198 /* compare new mount options with old ones */ 2199 error = nfs_compare_remount_data(nfss, data); 2200 out: 2201 kfree(data); 2202 return error; 2203 } 2204 EXPORT_SYMBOL_GPL(nfs_remount); 2205 2206 /* 2207 * Initialise the common bits of the superblock 2208 */ 2209 inline void nfs_initialise_sb(struct super_block *sb) 2210 { 2211 struct nfs_server *server = NFS_SB(sb); 2212 2213 sb->s_magic = NFS_SUPER_MAGIC; 2214 2215 /* We probably want something more informative here */ 2216 snprintf(sb->s_id, sizeof(sb->s_id), 2217 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2218 2219 if (sb->s_blocksize == 0) 2220 sb->s_blocksize = nfs_block_bits(server->wsize, 2221 &sb->s_blocksize_bits); 2222 2223 sb->s_bdi = &server->backing_dev_info; 2224 2225 nfs_super_set_maxbytes(sb, server->maxfilesize); 2226 } 2227 2228 /* 2229 * Finish setting up an NFS2/3 superblock 2230 */ 2231 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2232 { 2233 struct nfs_parsed_mount_data *data = mount_info->parsed; 2234 struct nfs_server *server = NFS_SB(sb); 2235 2236 sb->s_blocksize_bits = 0; 2237 sb->s_blocksize = 0; 2238 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2239 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2240 if (data && data->bsize) 2241 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2242 2243 if (server->nfs_client->rpc_ops->version != 2) { 2244 /* The VFS shouldn't apply the umask to mode bits. We will do 2245 * so ourselves when necessary. 2246 */ 2247 sb->s_flags |= MS_POSIXACL; 2248 sb->s_time_gran = 1; 2249 } 2250 2251 nfs_initialise_sb(sb); 2252 } 2253 EXPORT_SYMBOL_GPL(nfs_fill_super); 2254 2255 /* 2256 * Finish setting up a cloned NFS2/3/4 superblock 2257 */ 2258 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2259 { 2260 const struct super_block *old_sb = mount_info->cloned->sb; 2261 struct nfs_server *server = NFS_SB(sb); 2262 2263 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2264 sb->s_blocksize = old_sb->s_blocksize; 2265 sb->s_maxbytes = old_sb->s_maxbytes; 2266 sb->s_xattr = old_sb->s_xattr; 2267 sb->s_op = old_sb->s_op; 2268 sb->s_time_gran = 1; 2269 2270 if (server->nfs_client->rpc_ops->version != 2) { 2271 /* The VFS shouldn't apply the umask to mode bits. We will do 2272 * so ourselves when necessary. 2273 */ 2274 sb->s_flags |= MS_POSIXACL; 2275 } 2276 2277 nfs_initialise_sb(sb); 2278 } 2279 2280 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2281 { 2282 const struct nfs_server *a = s->s_fs_info; 2283 const struct rpc_clnt *clnt_a = a->client; 2284 const struct rpc_clnt *clnt_b = b->client; 2285 2286 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2287 goto Ebusy; 2288 if (a->nfs_client != b->nfs_client) 2289 goto Ebusy; 2290 if (a->flags != b->flags) 2291 goto Ebusy; 2292 if (a->wsize != b->wsize) 2293 goto Ebusy; 2294 if (a->rsize != b->rsize) 2295 goto Ebusy; 2296 if (a->acregmin != b->acregmin) 2297 goto Ebusy; 2298 if (a->acregmax != b->acregmax) 2299 goto Ebusy; 2300 if (a->acdirmin != b->acdirmin) 2301 goto Ebusy; 2302 if (a->acdirmax != b->acdirmax) 2303 goto Ebusy; 2304 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2305 goto Ebusy; 2306 return 1; 2307 Ebusy: 2308 return 0; 2309 } 2310 2311 struct nfs_sb_mountdata { 2312 struct nfs_server *server; 2313 int mntflags; 2314 }; 2315 2316 static int nfs_set_super(struct super_block *s, void *data) 2317 { 2318 struct nfs_sb_mountdata *sb_mntdata = data; 2319 struct nfs_server *server = sb_mntdata->server; 2320 int ret; 2321 2322 s->s_flags = sb_mntdata->mntflags; 2323 s->s_fs_info = server; 2324 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2325 ret = set_anon_super(s, server); 2326 if (ret == 0) 2327 server->s_dev = s->s_dev; 2328 return ret; 2329 } 2330 2331 static int nfs_compare_super_address(struct nfs_server *server1, 2332 struct nfs_server *server2) 2333 { 2334 struct sockaddr *sap1, *sap2; 2335 2336 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2337 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2338 2339 if (sap1->sa_family != sap2->sa_family) 2340 return 0; 2341 2342 switch (sap1->sa_family) { 2343 case AF_INET: { 2344 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2345 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2346 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2347 return 0; 2348 if (sin1->sin_port != sin2->sin_port) 2349 return 0; 2350 break; 2351 } 2352 case AF_INET6: { 2353 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2354 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2355 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2356 return 0; 2357 if (sin1->sin6_port != sin2->sin6_port) 2358 return 0; 2359 break; 2360 } 2361 default: 2362 return 0; 2363 } 2364 2365 return 1; 2366 } 2367 2368 static int nfs_compare_super(struct super_block *sb, void *data) 2369 { 2370 struct nfs_sb_mountdata *sb_mntdata = data; 2371 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2372 int mntflags = sb_mntdata->mntflags; 2373 2374 if (!nfs_compare_super_address(old, server)) 2375 return 0; 2376 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2377 if (old->flags & NFS_MOUNT_UNSHARED) 2378 return 0; 2379 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2380 return 0; 2381 return nfs_compare_mount_options(sb, server, mntflags); 2382 } 2383 2384 #ifdef CONFIG_NFS_FSCACHE 2385 static void nfs_get_cache_cookie(struct super_block *sb, 2386 struct nfs_parsed_mount_data *parsed, 2387 struct nfs_clone_mount *cloned) 2388 { 2389 struct nfs_server *nfss = NFS_SB(sb); 2390 char *uniq = NULL; 2391 int ulen = 0; 2392 2393 nfss->fscache_key = NULL; 2394 nfss->fscache = NULL; 2395 2396 if (parsed) { 2397 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2398 return; 2399 if (parsed->fscache_uniq) { 2400 uniq = parsed->fscache_uniq; 2401 ulen = strlen(parsed->fscache_uniq); 2402 } 2403 } else if (cloned) { 2404 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2405 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2406 return; 2407 if (mnt_s->fscache_key) { 2408 uniq = mnt_s->fscache_key->key.uniquifier; 2409 ulen = mnt_s->fscache_key->key.uniq_len; 2410 }; 2411 } else 2412 return; 2413 2414 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2415 } 2416 #else 2417 static void nfs_get_cache_cookie(struct super_block *sb, 2418 struct nfs_parsed_mount_data *parsed, 2419 struct nfs_clone_mount *cloned) 2420 { 2421 } 2422 #endif 2423 2424 static int nfs_bdi_register(struct nfs_server *server) 2425 { 2426 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2427 } 2428 2429 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2430 struct nfs_mount_info *mount_info) 2431 { 2432 int error; 2433 unsigned long kflags = 0, kflags_out = 0; 2434 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2435 kflags |= SECURITY_LSM_NATIVE_LABELS; 2436 2437 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts, 2438 kflags, &kflags_out); 2439 if (error) 2440 goto err; 2441 2442 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2443 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2444 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2445 err: 2446 return error; 2447 } 2448 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2449 2450 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2451 struct nfs_mount_info *mount_info) 2452 { 2453 /* clone any lsm security options from the parent to the new sb */ 2454 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2455 return -ESTALE; 2456 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2457 } 2458 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2459 2460 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2461 int flags, const char *dev_name, 2462 struct nfs_mount_info *mount_info, 2463 struct nfs_subversion *nfs_mod) 2464 { 2465 struct super_block *s; 2466 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2467 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2468 struct nfs_sb_mountdata sb_mntdata = { 2469 .mntflags = flags, 2470 .server = server, 2471 }; 2472 int error; 2473 2474 if (server->flags & NFS_MOUNT_UNSHARED) 2475 compare_super = NULL; 2476 2477 /* -o noac implies -o sync */ 2478 if (server->flags & NFS_MOUNT_NOAC) 2479 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2480 2481 /* Get a superblock - note that we may end up sharing one that already exists */ 2482 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2483 if (IS_ERR(s)) { 2484 mntroot = ERR_CAST(s); 2485 goto out_err_nosb; 2486 } 2487 2488 if (s->s_fs_info != server) { 2489 nfs_free_server(server); 2490 server = NULL; 2491 } else { 2492 error = nfs_bdi_register(server); 2493 if (error) { 2494 mntroot = ERR_PTR(error); 2495 goto error_splat_bdi; 2496 } 2497 } 2498 2499 if (!s->s_root) { 2500 /* initial superblock/root creation */ 2501 mount_info->fill_super(s, mount_info); 2502 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2503 } 2504 2505 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2506 if (IS_ERR(mntroot)) 2507 goto error_splat_super; 2508 2509 error = mount_info->set_security(s, mntroot, mount_info); 2510 if (error) 2511 goto error_splat_root; 2512 2513 s->s_flags |= MS_ACTIVE; 2514 2515 out: 2516 return mntroot; 2517 2518 out_err_nosb: 2519 nfs_free_server(server); 2520 goto out; 2521 2522 error_splat_root: 2523 dput(mntroot); 2524 mntroot = ERR_PTR(error); 2525 error_splat_super: 2526 if (server && !s->s_root) 2527 bdi_unregister(&server->backing_dev_info); 2528 error_splat_bdi: 2529 deactivate_locked_super(s); 2530 goto out; 2531 } 2532 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2533 2534 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2535 int flags, const char *dev_name, void *raw_data) 2536 { 2537 struct nfs_mount_info mount_info = { 2538 .fill_super = nfs_fill_super, 2539 .set_security = nfs_set_sb_security, 2540 }; 2541 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2542 struct nfs_subversion *nfs_mod; 2543 int error; 2544 2545 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2546 mount_info.mntfh = nfs_alloc_fhandle(); 2547 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2548 goto out; 2549 2550 /* Validate the mount data */ 2551 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2552 if (error == NFS_TEXT_DATA) 2553 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2554 if (error < 0) { 2555 mntroot = ERR_PTR(error); 2556 goto out; 2557 } 2558 2559 nfs_mod = get_nfs_version(mount_info.parsed->version); 2560 if (IS_ERR(nfs_mod)) { 2561 mntroot = ERR_CAST(nfs_mod); 2562 goto out; 2563 } 2564 2565 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2566 2567 put_nfs_version(nfs_mod); 2568 out: 2569 nfs_free_parsed_mount_data(mount_info.parsed); 2570 nfs_free_fhandle(mount_info.mntfh); 2571 return mntroot; 2572 } 2573 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2574 2575 /* 2576 * Ensure that we unregister the bdi before kill_anon_super 2577 * releases the device name 2578 */ 2579 void nfs_put_super(struct super_block *s) 2580 { 2581 struct nfs_server *server = NFS_SB(s); 2582 2583 bdi_unregister(&server->backing_dev_info); 2584 } 2585 EXPORT_SYMBOL_GPL(nfs_put_super); 2586 2587 /* 2588 * Destroy an NFS2/3 superblock 2589 */ 2590 void nfs_kill_super(struct super_block *s) 2591 { 2592 struct nfs_server *server = NFS_SB(s); 2593 2594 kill_anon_super(s); 2595 nfs_fscache_release_super_cookie(s); 2596 nfs_free_server(server); 2597 } 2598 EXPORT_SYMBOL_GPL(nfs_kill_super); 2599 2600 /* 2601 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2602 */ 2603 static struct dentry * 2604 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2605 const char *dev_name, void *raw_data) 2606 { 2607 struct nfs_clone_mount *data = raw_data; 2608 struct nfs_mount_info mount_info = { 2609 .fill_super = nfs_clone_super, 2610 .set_security = nfs_clone_sb_security, 2611 .cloned = data, 2612 }; 2613 struct nfs_server *server; 2614 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2615 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2616 2617 dprintk("--> nfs_xdev_mount()\n"); 2618 2619 mount_info.mntfh = mount_info.cloned->fh; 2620 2621 /* create a new volume representation */ 2622 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2623 2624 if (IS_ERR(server)) 2625 mntroot = ERR_CAST(server); 2626 else 2627 mntroot = nfs_fs_mount_common(server, flags, 2628 dev_name, &mount_info, nfs_mod); 2629 2630 dprintk("<-- nfs_xdev_mount() = %ld\n", 2631 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2632 return mntroot; 2633 } 2634 2635 #if IS_ENABLED(CONFIG_NFS_V4) 2636 2637 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2638 { 2639 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2640 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2641 } 2642 2643 /* 2644 * Validate NFSv4 mount options 2645 */ 2646 static int nfs4_validate_mount_data(void *options, 2647 struct nfs_parsed_mount_data *args, 2648 const char *dev_name) 2649 { 2650 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2651 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2652 char *c; 2653 2654 if (data == NULL) 2655 goto out_no_data; 2656 2657 args->version = 4; 2658 2659 switch (data->version) { 2660 case 1: 2661 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2662 goto out_no_address; 2663 if (data->host_addrlen == 0) 2664 goto out_no_address; 2665 args->nfs_server.addrlen = data->host_addrlen; 2666 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2667 return -EFAULT; 2668 if (!nfs_verify_server_address(sap)) 2669 goto out_no_address; 2670 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2671 2672 args->auth_flavors[0] = RPC_AUTH_UNIX; 2673 if (data->auth_flavourlen) { 2674 if (data->auth_flavourlen > 1) 2675 goto out_inval_auth; 2676 if (copy_from_user(&args->auth_flavors[0], 2677 data->auth_flavours, 2678 sizeof(args->auth_flavors[0]))) 2679 return -EFAULT; 2680 } 2681 2682 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2683 if (IS_ERR(c)) 2684 return PTR_ERR(c); 2685 args->nfs_server.hostname = c; 2686 2687 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2688 if (IS_ERR(c)) 2689 return PTR_ERR(c); 2690 args->nfs_server.export_path = c; 2691 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2692 2693 c = strndup_user(data->client_addr.data, 16); 2694 if (IS_ERR(c)) 2695 return PTR_ERR(c); 2696 args->client_address = c; 2697 2698 /* 2699 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2700 * can deal with. 2701 */ 2702 2703 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2704 args->rsize = data->rsize; 2705 args->wsize = data->wsize; 2706 args->timeo = data->timeo; 2707 args->retrans = data->retrans; 2708 args->acregmin = data->acregmin; 2709 args->acregmax = data->acregmax; 2710 args->acdirmin = data->acdirmin; 2711 args->acdirmax = data->acdirmax; 2712 args->nfs_server.protocol = data->proto; 2713 nfs_validate_transport_protocol(args); 2714 2715 break; 2716 default: 2717 return NFS_TEXT_DATA; 2718 } 2719 2720 return 0; 2721 2722 out_no_data: 2723 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2724 return -EINVAL; 2725 2726 out_inval_auth: 2727 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2728 data->auth_flavourlen); 2729 return -EINVAL; 2730 2731 out_no_address: 2732 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2733 return -EINVAL; 2734 } 2735 2736 /* 2737 * NFS v4 module parameters need to stay in the 2738 * NFS client for backwards compatibility 2739 */ 2740 unsigned int nfs_callback_set_tcpport; 2741 unsigned short nfs_callback_tcpport; 2742 /* Default cache timeout is 10 minutes */ 2743 unsigned int nfs_idmap_cache_timeout = 600; 2744 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2745 bool nfs4_disable_idmapping = true; 2746 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2747 unsigned short send_implementation_id = 1; 2748 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2749 2750 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2751 EXPORT_SYMBOL_GPL(nfs_callback_tcpport); 2752 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2753 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2754 EXPORT_SYMBOL_GPL(max_session_slots); 2755 EXPORT_SYMBOL_GPL(send_implementation_id); 2756 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2757 2758 #define NFS_CALLBACK_MAXPORTNR (65535U) 2759 2760 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2761 { 2762 unsigned long num; 2763 int ret; 2764 2765 if (!val) 2766 return -EINVAL; 2767 ret = kstrtoul(val, 0, &num); 2768 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2769 return -EINVAL; 2770 *((unsigned int *)kp->arg) = num; 2771 return 0; 2772 } 2773 static struct kernel_param_ops param_ops_portnr = { 2774 .set = param_set_portnr, 2775 .get = param_get_uint, 2776 }; 2777 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2778 2779 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2780 module_param(nfs_idmap_cache_timeout, int, 0644); 2781 module_param(nfs4_disable_idmapping, bool, 0644); 2782 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2783 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2784 MODULE_PARM_DESC(nfs4_disable_idmapping, 2785 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2786 module_param(max_session_slots, ushort, 0644); 2787 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2788 "requests the client will negotiate"); 2789 module_param(send_implementation_id, ushort, 0644); 2790 MODULE_PARM_DESC(send_implementation_id, 2791 "Send implementation ID with NFSv4.1 exchange_id"); 2792 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2793 2794 #endif /* CONFIG_NFS_V4 */ 2795