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/stats.h> 35 #include <linux/sunrpc/metrics.h> 36 #include <linux/sunrpc/xprtsock.h> 37 #include <linux/sunrpc/xprtrdma.h> 38 #include <linux/nfs_fs.h> 39 #include <linux/nfs_mount.h> 40 #include <linux/nfs4_mount.h> 41 #include <linux/lockd/bind.h> 42 #include <linux/seq_file.h> 43 #include <linux/mount.h> 44 #include <linux/namei.h> 45 #include <linux/nfs_idmap.h> 46 #include <linux/vfs.h> 47 #include <linux/inet.h> 48 #include <linux/in6.h> 49 #include <linux/slab.h> 50 #include <net/ipv6.h> 51 #include <linux/netdevice.h> 52 #include <linux/nfs_xdr.h> 53 #include <linux/magic.h> 54 #include <linux/parser.h> 55 #include <linux/nsproxy.h> 56 #include <linux/rcupdate.h> 57 58 #include <asm/uaccess.h> 59 60 #include "nfs4_fs.h" 61 #include "callback.h" 62 #include "delegation.h" 63 #include "iostat.h" 64 #include "internal.h" 65 #include "fscache.h" 66 #include "nfs4session.h" 67 #include "pnfs.h" 68 #include "nfs.h" 69 70 #define NFSDBG_FACILITY NFSDBG_VFS 71 #define NFS_TEXT_DATA 1 72 73 #if IS_ENABLED(CONFIG_NFS_V3) 74 #define NFS_DEFAULT_VERSION 3 75 #else 76 #define NFS_DEFAULT_VERSION 2 77 #endif 78 79 enum { 80 /* Mount options that take no arguments */ 81 Opt_soft, Opt_hard, 82 Opt_posix, Opt_noposix, 83 Opt_cto, Opt_nocto, 84 Opt_ac, Opt_noac, 85 Opt_lock, Opt_nolock, 86 Opt_udp, Opt_tcp, Opt_rdma, 87 Opt_acl, Opt_noacl, 88 Opt_rdirplus, Opt_nordirplus, 89 Opt_sharecache, Opt_nosharecache, 90 Opt_resvport, Opt_noresvport, 91 Opt_fscache, Opt_nofscache, 92 Opt_migration, Opt_nomigration, 93 94 /* Mount options that take integer arguments */ 95 Opt_port, 96 Opt_rsize, Opt_wsize, Opt_bsize, 97 Opt_timeo, Opt_retrans, 98 Opt_acregmin, Opt_acregmax, 99 Opt_acdirmin, Opt_acdirmax, 100 Opt_actimeo, 101 Opt_namelen, 102 Opt_mountport, 103 Opt_mountvers, 104 Opt_minorversion, 105 106 /* Mount options that take string arguments */ 107 Opt_nfsvers, 108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 109 Opt_addr, Opt_mountaddr, Opt_clientaddr, 110 Opt_lookupcache, 111 Opt_fscache_uniq, 112 Opt_local_lock, 113 114 /* Special mount options */ 115 Opt_userspace, Opt_deprecated, Opt_sloppy, 116 117 Opt_err 118 }; 119 120 static const match_table_t nfs_mount_option_tokens = { 121 { Opt_userspace, "bg" }, 122 { Opt_userspace, "fg" }, 123 { Opt_userspace, "retry=%s" }, 124 125 { Opt_sloppy, "sloppy" }, 126 127 { Opt_soft, "soft" }, 128 { Opt_hard, "hard" }, 129 { Opt_deprecated, "intr" }, 130 { Opt_deprecated, "nointr" }, 131 { Opt_posix, "posix" }, 132 { Opt_noposix, "noposix" }, 133 { Opt_cto, "cto" }, 134 { Opt_nocto, "nocto" }, 135 { Opt_ac, "ac" }, 136 { Opt_noac, "noac" }, 137 { Opt_lock, "lock" }, 138 { Opt_nolock, "nolock" }, 139 { Opt_udp, "udp" }, 140 { Opt_tcp, "tcp" }, 141 { Opt_rdma, "rdma" }, 142 { Opt_acl, "acl" }, 143 { Opt_noacl, "noacl" }, 144 { Opt_rdirplus, "rdirplus" }, 145 { Opt_nordirplus, "nordirplus" }, 146 { Opt_sharecache, "sharecache" }, 147 { Opt_nosharecache, "nosharecache" }, 148 { Opt_resvport, "resvport" }, 149 { Opt_noresvport, "noresvport" }, 150 { Opt_fscache, "fsc" }, 151 { Opt_nofscache, "nofsc" }, 152 { Opt_migration, "migration" }, 153 { Opt_nomigration, "nomigration" }, 154 155 { Opt_port, "port=%s" }, 156 { Opt_rsize, "rsize=%s" }, 157 { Opt_wsize, "wsize=%s" }, 158 { Opt_bsize, "bsize=%s" }, 159 { Opt_timeo, "timeo=%s" }, 160 { Opt_retrans, "retrans=%s" }, 161 { Opt_acregmin, "acregmin=%s" }, 162 { Opt_acregmax, "acregmax=%s" }, 163 { Opt_acdirmin, "acdirmin=%s" }, 164 { Opt_acdirmax, "acdirmax=%s" }, 165 { Opt_actimeo, "actimeo=%s" }, 166 { Opt_namelen, "namlen=%s" }, 167 { Opt_mountport, "mountport=%s" }, 168 { Opt_mountvers, "mountvers=%s" }, 169 { Opt_minorversion, "minorversion=%s" }, 170 171 { Opt_nfsvers, "nfsvers=%s" }, 172 { Opt_nfsvers, "vers=%s" }, 173 174 { Opt_sec, "sec=%s" }, 175 { Opt_proto, "proto=%s" }, 176 { Opt_mountproto, "mountproto=%s" }, 177 { Opt_addr, "addr=%s" }, 178 { Opt_clientaddr, "clientaddr=%s" }, 179 { Opt_mounthost, "mounthost=%s" }, 180 { Opt_mountaddr, "mountaddr=%s" }, 181 182 { Opt_lookupcache, "lookupcache=%s" }, 183 { Opt_fscache_uniq, "fsc=%s" }, 184 { Opt_local_lock, "local_lock=%s" }, 185 186 /* The following needs to be listed after all other options */ 187 { Opt_nfsvers, "v%s" }, 188 189 { Opt_err, NULL } 190 }; 191 192 enum { 193 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 194 195 Opt_xprt_err 196 }; 197 198 static const match_table_t nfs_xprt_protocol_tokens = { 199 { Opt_xprt_udp, "udp" }, 200 { Opt_xprt_udp6, "udp6" }, 201 { Opt_xprt_tcp, "tcp" }, 202 { Opt_xprt_tcp6, "tcp6" }, 203 { Opt_xprt_rdma, "rdma" }, 204 205 { Opt_xprt_err, NULL } 206 }; 207 208 enum { 209 Opt_sec_none, Opt_sec_sys, 210 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 211 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 212 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 213 214 Opt_sec_err 215 }; 216 217 static const match_table_t nfs_secflavor_tokens = { 218 { Opt_sec_none, "none" }, 219 { Opt_sec_none, "null" }, 220 { Opt_sec_sys, "sys" }, 221 222 { Opt_sec_krb5, "krb5" }, 223 { Opt_sec_krb5i, "krb5i" }, 224 { Opt_sec_krb5p, "krb5p" }, 225 226 { Opt_sec_lkey, "lkey" }, 227 { Opt_sec_lkeyi, "lkeyi" }, 228 { Opt_sec_lkeyp, "lkeyp" }, 229 230 { Opt_sec_spkm, "spkm3" }, 231 { Opt_sec_spkmi, "spkm3i" }, 232 { Opt_sec_spkmp, "spkm3p" }, 233 234 { Opt_sec_err, NULL } 235 }; 236 237 enum { 238 Opt_lookupcache_all, Opt_lookupcache_positive, 239 Opt_lookupcache_none, 240 241 Opt_lookupcache_err 242 }; 243 244 static match_table_t nfs_lookupcache_tokens = { 245 { Opt_lookupcache_all, "all" }, 246 { Opt_lookupcache_positive, "pos" }, 247 { Opt_lookupcache_positive, "positive" }, 248 { Opt_lookupcache_none, "none" }, 249 250 { Opt_lookupcache_err, NULL } 251 }; 252 253 enum { 254 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 255 Opt_local_lock_none, 256 257 Opt_local_lock_err 258 }; 259 260 static match_table_t nfs_local_lock_tokens = { 261 { Opt_local_lock_all, "all" }, 262 { Opt_local_lock_flock, "flock" }, 263 { Opt_local_lock_posix, "posix" }, 264 { Opt_local_lock_none, "none" }, 265 266 { Opt_local_lock_err, NULL } 267 }; 268 269 enum { 270 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 271 Opt_vers_4_1, 272 273 Opt_vers_err 274 }; 275 276 static match_table_t nfs_vers_tokens = { 277 { Opt_vers_2, "2" }, 278 { Opt_vers_3, "3" }, 279 { Opt_vers_4, "4" }, 280 { Opt_vers_4_0, "4.0" }, 281 { Opt_vers_4_1, "4.1" }, 282 283 { Opt_vers_err, NULL } 284 }; 285 286 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 287 int flags, const char *dev_name, void *raw_data); 288 289 struct file_system_type nfs_fs_type = { 290 .owner = THIS_MODULE, 291 .name = "nfs", 292 .mount = nfs_fs_mount, 293 .kill_sb = nfs_kill_super, 294 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 295 }; 296 EXPORT_SYMBOL_GPL(nfs_fs_type); 297 298 struct file_system_type nfs_xdev_fs_type = { 299 .owner = THIS_MODULE, 300 .name = "nfs", 301 .mount = nfs_xdev_mount, 302 .kill_sb = nfs_kill_super, 303 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 304 }; 305 306 const struct super_operations nfs_sops = { 307 .alloc_inode = nfs_alloc_inode, 308 .destroy_inode = nfs_destroy_inode, 309 .write_inode = nfs_write_inode, 310 .drop_inode = nfs_drop_inode, 311 .put_super = nfs_put_super, 312 .statfs = nfs_statfs, 313 .evict_inode = nfs_evict_inode, 314 .umount_begin = nfs_umount_begin, 315 .show_options = nfs_show_options, 316 .show_devname = nfs_show_devname, 317 .show_path = nfs_show_path, 318 .show_stats = nfs_show_stats, 319 .remount_fs = nfs_remount, 320 }; 321 EXPORT_SYMBOL_GPL(nfs_sops); 322 323 #if IS_ENABLED(CONFIG_NFS_V4) 324 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 325 static int nfs4_validate_mount_data(void *options, 326 struct nfs_parsed_mount_data *args, const char *dev_name); 327 328 struct file_system_type nfs4_fs_type = { 329 .owner = THIS_MODULE, 330 .name = "nfs4", 331 .mount = nfs_fs_mount, 332 .kill_sb = nfs_kill_super, 333 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 334 }; 335 EXPORT_SYMBOL_GPL(nfs4_fs_type); 336 337 static int __init register_nfs4_fs(void) 338 { 339 return register_filesystem(&nfs4_fs_type); 340 } 341 342 static void unregister_nfs4_fs(void) 343 { 344 unregister_filesystem(&nfs4_fs_type); 345 } 346 #else 347 static int __init register_nfs4_fs(void) 348 { 349 return 0; 350 } 351 352 static void unregister_nfs4_fs(void) 353 { 354 } 355 #endif 356 357 static struct shrinker acl_shrinker = { 358 .shrink = nfs_access_cache_shrinker, 359 .seeks = DEFAULT_SEEKS, 360 }; 361 362 /* 363 * Register the NFS filesystems 364 */ 365 int __init register_nfs_fs(void) 366 { 367 int ret; 368 369 ret = register_filesystem(&nfs_fs_type); 370 if (ret < 0) 371 goto error_0; 372 373 ret = register_nfs4_fs(); 374 if (ret < 0) 375 goto error_1; 376 377 ret = nfs_register_sysctl(); 378 if (ret < 0) 379 goto error_2; 380 register_shrinker(&acl_shrinker); 381 return 0; 382 383 error_2: 384 unregister_nfs4_fs(); 385 error_1: 386 unregister_filesystem(&nfs_fs_type); 387 error_0: 388 return ret; 389 } 390 391 /* 392 * Unregister the NFS filesystems 393 */ 394 void __exit unregister_nfs_fs(void) 395 { 396 unregister_shrinker(&acl_shrinker); 397 nfs_unregister_sysctl(); 398 unregister_nfs4_fs(); 399 unregister_filesystem(&nfs_fs_type); 400 } 401 402 void nfs_sb_active(struct super_block *sb) 403 { 404 struct nfs_server *server = NFS_SB(sb); 405 406 if (atomic_inc_return(&server->active) == 1) 407 atomic_inc(&sb->s_active); 408 } 409 EXPORT_SYMBOL_GPL(nfs_sb_active); 410 411 void nfs_sb_deactive(struct super_block *sb) 412 { 413 struct nfs_server *server = NFS_SB(sb); 414 415 if (atomic_dec_and_test(&server->active)) 416 deactivate_super(sb); 417 } 418 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 419 420 /* 421 * Deliver file system statistics to userspace 422 */ 423 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 424 { 425 struct nfs_server *server = NFS_SB(dentry->d_sb); 426 unsigned char blockbits; 427 unsigned long blockres; 428 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 429 struct nfs_fsstat res; 430 int error = -ENOMEM; 431 432 res.fattr = nfs_alloc_fattr(); 433 if (res.fattr == NULL) 434 goto out_err; 435 436 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 437 if (unlikely(error == -ESTALE)) { 438 struct dentry *pd_dentry; 439 440 pd_dentry = dget_parent(dentry); 441 if (pd_dentry != NULL) { 442 nfs_zap_caches(pd_dentry->d_inode); 443 dput(pd_dentry); 444 } 445 } 446 nfs_free_fattr(res.fattr); 447 if (error < 0) 448 goto out_err; 449 450 buf->f_type = NFS_SUPER_MAGIC; 451 452 /* 453 * Current versions of glibc do not correctly handle the 454 * case where f_frsize != f_bsize. Eventually we want to 455 * report the value of wtmult in this field. 456 */ 457 buf->f_frsize = dentry->d_sb->s_blocksize; 458 459 /* 460 * On most *nix systems, f_blocks, f_bfree, and f_bavail 461 * are reported in units of f_frsize. Linux hasn't had 462 * an f_frsize field in its statfs struct until recently, 463 * thus historically Linux's sys_statfs reports these 464 * fields in units of f_bsize. 465 */ 466 buf->f_bsize = dentry->d_sb->s_blocksize; 467 blockbits = dentry->d_sb->s_blocksize_bits; 468 blockres = (1 << blockbits) - 1; 469 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 470 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 471 buf->f_bavail = (res.abytes + blockres) >> blockbits; 472 473 buf->f_files = res.tfiles; 474 buf->f_ffree = res.afiles; 475 476 buf->f_namelen = server->namelen; 477 478 return 0; 479 480 out_err: 481 dprintk("%s: statfs error = %d\n", __func__, -error); 482 return error; 483 } 484 EXPORT_SYMBOL_GPL(nfs_statfs); 485 486 /* 487 * Map the security flavour number to a name 488 */ 489 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 490 { 491 static const struct { 492 rpc_authflavor_t flavour; 493 const char *str; 494 } sec_flavours[] = { 495 { RPC_AUTH_NULL, "null" }, 496 { RPC_AUTH_UNIX, "sys" }, 497 { RPC_AUTH_GSS_KRB5, "krb5" }, 498 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 499 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 500 { RPC_AUTH_GSS_LKEY, "lkey" }, 501 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 502 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 503 { RPC_AUTH_GSS_SPKM, "spkm" }, 504 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 505 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 506 { UINT_MAX, "unknown" } 507 }; 508 int i; 509 510 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 511 if (sec_flavours[i].flavour == flavour) 512 break; 513 } 514 return sec_flavours[i].str; 515 } 516 517 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 518 int showdefaults) 519 { 520 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 521 522 seq_printf(m, ",mountproto="); 523 switch (sap->sa_family) { 524 case AF_INET: 525 switch (nfss->mountd_protocol) { 526 case IPPROTO_UDP: 527 seq_printf(m, RPCBIND_NETID_UDP); 528 break; 529 case IPPROTO_TCP: 530 seq_printf(m, RPCBIND_NETID_TCP); 531 break; 532 default: 533 if (showdefaults) 534 seq_printf(m, "auto"); 535 } 536 break; 537 case AF_INET6: 538 switch (nfss->mountd_protocol) { 539 case IPPROTO_UDP: 540 seq_printf(m, RPCBIND_NETID_UDP6); 541 break; 542 case IPPROTO_TCP: 543 seq_printf(m, RPCBIND_NETID_TCP6); 544 break; 545 default: 546 if (showdefaults) 547 seq_printf(m, "auto"); 548 } 549 break; 550 default: 551 if (showdefaults) 552 seq_printf(m, "auto"); 553 } 554 } 555 556 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 557 int showdefaults) 558 { 559 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 560 561 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 562 return; 563 564 switch (sap->sa_family) { 565 case AF_INET: { 566 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 567 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 568 break; 569 } 570 case AF_INET6: { 571 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 572 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 573 break; 574 } 575 default: 576 if (showdefaults) 577 seq_printf(m, ",mountaddr=unspecified"); 578 } 579 580 if (nfss->mountd_version || showdefaults) 581 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 582 if ((nfss->mountd_port && 583 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 584 showdefaults) 585 seq_printf(m, ",mountport=%u", nfss->mountd_port); 586 587 nfs_show_mountd_netid(m, nfss, showdefaults); 588 } 589 590 #if IS_ENABLED(CONFIG_NFS_V4) 591 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 592 int showdefaults) 593 { 594 struct nfs_client *clp = nfss->nfs_client; 595 596 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 597 } 598 #else 599 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 600 int showdefaults) 601 { 602 } 603 #endif 604 605 static void nfs_show_nfs_version(struct seq_file *m, 606 unsigned int version, 607 unsigned int minorversion) 608 { 609 seq_printf(m, ",vers=%u", version); 610 if (version == 4) 611 seq_printf(m, ".%u", minorversion); 612 } 613 614 /* 615 * Describe the mount options in force on this server representation 616 */ 617 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 618 int showdefaults) 619 { 620 static const struct proc_nfs_info { 621 int flag; 622 const char *str; 623 const char *nostr; 624 } nfs_info[] = { 625 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 626 { NFS_MOUNT_POSIX, ",posix", "" }, 627 { NFS_MOUNT_NOCTO, ",nocto", "" }, 628 { NFS_MOUNT_NOAC, ",noac", "" }, 629 { NFS_MOUNT_NONLM, ",nolock", "" }, 630 { NFS_MOUNT_NOACL, ",noacl", "" }, 631 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 632 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 633 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 634 { 0, NULL, NULL } 635 }; 636 const struct proc_nfs_info *nfs_infop; 637 struct nfs_client *clp = nfss->nfs_client; 638 u32 version = clp->rpc_ops->version; 639 int local_flock, local_fcntl; 640 641 nfs_show_nfs_version(m, version, clp->cl_minorversion); 642 seq_printf(m, ",rsize=%u", nfss->rsize); 643 seq_printf(m, ",wsize=%u", nfss->wsize); 644 if (nfss->bsize != 0) 645 seq_printf(m, ",bsize=%u", nfss->bsize); 646 seq_printf(m, ",namlen=%u", nfss->namelen); 647 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 648 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 649 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 650 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 651 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 652 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 653 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 654 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 655 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 656 if (nfss->flags & nfs_infop->flag) 657 seq_puts(m, nfs_infop->str); 658 else 659 seq_puts(m, nfs_infop->nostr); 660 } 661 rcu_read_lock(); 662 seq_printf(m, ",proto=%s", 663 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 664 rcu_read_unlock(); 665 if (version == 4) { 666 if (nfss->port != NFS_PORT) 667 seq_printf(m, ",port=%u", nfss->port); 668 } else 669 if (nfss->port) 670 seq_printf(m, ",port=%u", nfss->port); 671 672 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 673 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 674 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 675 676 if (version != 4) 677 nfs_show_mountd_options(m, nfss, showdefaults); 678 else 679 nfs_show_nfsv4_options(m, nfss, showdefaults); 680 681 if (nfss->options & NFS_OPTION_FSCACHE) 682 seq_printf(m, ",fsc"); 683 684 if (nfss->options & NFS_OPTION_MIGRATION) 685 seq_printf(m, ",migration"); 686 687 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 688 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 689 seq_printf(m, ",lookupcache=none"); 690 else 691 seq_printf(m, ",lookupcache=pos"); 692 } 693 694 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 695 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 696 697 if (!local_flock && !local_fcntl) 698 seq_printf(m, ",local_lock=none"); 699 else if (local_flock && local_fcntl) 700 seq_printf(m, ",local_lock=all"); 701 else if (local_flock) 702 seq_printf(m, ",local_lock=flock"); 703 else 704 seq_printf(m, ",local_lock=posix"); 705 } 706 707 /* 708 * Describe the mount options on this VFS mountpoint 709 */ 710 int nfs_show_options(struct seq_file *m, struct dentry *root) 711 { 712 struct nfs_server *nfss = NFS_SB(root->d_sb); 713 714 nfs_show_mount_options(m, nfss, 0); 715 716 rcu_read_lock(); 717 seq_printf(m, ",addr=%s", 718 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 719 RPC_DISPLAY_ADDR)); 720 rcu_read_unlock(); 721 722 return 0; 723 } 724 EXPORT_SYMBOL_GPL(nfs_show_options); 725 726 #if IS_ENABLED(CONFIG_NFS_V4) 727 #ifdef CONFIG_NFS_V4_1 728 static void show_sessions(struct seq_file *m, struct nfs_server *server) 729 { 730 if (nfs4_has_session(server->nfs_client)) 731 seq_printf(m, ",sessions"); 732 } 733 #else 734 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 735 #endif 736 #endif 737 738 #ifdef CONFIG_NFS_V4_1 739 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 740 { 741 seq_printf(m, ",pnfs="); 742 if (server->pnfs_curr_ld) 743 seq_printf(m, "%s", server->pnfs_curr_ld->name); 744 else 745 seq_printf(m, "not configured"); 746 } 747 748 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 749 { 750 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 751 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 752 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 753 "date='%llu,%u'", 754 impl_id->name, impl_id->domain, 755 impl_id->date.seconds, impl_id->date.nseconds); 756 } 757 } 758 #else 759 #if IS_ENABLED(CONFIG_NFS_V4) 760 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 761 { 762 } 763 #endif 764 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 765 { 766 } 767 #endif 768 769 int nfs_show_devname(struct seq_file *m, struct dentry *root) 770 { 771 char *page = (char *) __get_free_page(GFP_KERNEL); 772 char *devname, *dummy; 773 int err = 0; 774 if (!page) 775 return -ENOMEM; 776 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 777 if (IS_ERR(devname)) 778 err = PTR_ERR(devname); 779 else 780 seq_escape(m, devname, " \t\n\\"); 781 free_page((unsigned long)page); 782 return err; 783 } 784 EXPORT_SYMBOL_GPL(nfs_show_devname); 785 786 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 787 { 788 seq_puts(m, "/"); 789 return 0; 790 } 791 EXPORT_SYMBOL_GPL(nfs_show_path); 792 793 /* 794 * Present statistical information for this VFS mountpoint 795 */ 796 int nfs_show_stats(struct seq_file *m, struct dentry *root) 797 { 798 int i, cpu; 799 struct nfs_server *nfss = NFS_SB(root->d_sb); 800 struct rpc_auth *auth = nfss->client->cl_auth; 801 struct nfs_iostats totals = { }; 802 803 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 804 805 /* 806 * Display all mount option settings 807 */ 808 seq_printf(m, "\n\topts:\t"); 809 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 810 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 811 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 812 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 813 nfs_show_mount_options(m, nfss, 1); 814 815 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 816 817 show_implementation_id(m, nfss); 818 819 seq_printf(m, "\n\tcaps:\t"); 820 seq_printf(m, "caps=0x%x", nfss->caps); 821 seq_printf(m, ",wtmult=%u", nfss->wtmult); 822 seq_printf(m, ",dtsize=%u", nfss->dtsize); 823 seq_printf(m, ",bsize=%u", nfss->bsize); 824 seq_printf(m, ",namlen=%u", nfss->namelen); 825 826 #if IS_ENABLED(CONFIG_NFS_V4) 827 if (nfss->nfs_client->rpc_ops->version == 4) { 828 seq_printf(m, "\n\tnfsv4:\t"); 829 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 830 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 831 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 832 show_sessions(m, nfss); 833 show_pnfs(m, nfss); 834 } 835 #endif 836 837 /* 838 * Display security flavor in effect for this mount 839 */ 840 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 841 if (auth->au_flavor) 842 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 843 844 /* 845 * Display superblock I/O counters 846 */ 847 for_each_possible_cpu(cpu) { 848 struct nfs_iostats *stats; 849 850 preempt_disable(); 851 stats = per_cpu_ptr(nfss->io_stats, cpu); 852 853 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 854 totals.events[i] += stats->events[i]; 855 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 856 totals.bytes[i] += stats->bytes[i]; 857 #ifdef CONFIG_NFS_FSCACHE 858 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 859 totals.fscache[i] += stats->fscache[i]; 860 #endif 861 862 preempt_enable(); 863 } 864 865 seq_printf(m, "\n\tevents:\t"); 866 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 867 seq_printf(m, "%lu ", totals.events[i]); 868 seq_printf(m, "\n\tbytes:\t"); 869 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 870 seq_printf(m, "%Lu ", totals.bytes[i]); 871 #ifdef CONFIG_NFS_FSCACHE 872 if (nfss->options & NFS_OPTION_FSCACHE) { 873 seq_printf(m, "\n\tfsc:\t"); 874 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 875 seq_printf(m, "%Lu ", totals.bytes[i]); 876 } 877 #endif 878 seq_printf(m, "\n"); 879 880 rpc_print_iostats(m, nfss->client); 881 882 return 0; 883 } 884 EXPORT_SYMBOL_GPL(nfs_show_stats); 885 886 /* 887 * Begin unmount by attempting to remove all automounted mountpoints we added 888 * in response to xdev traversals and referrals 889 */ 890 void nfs_umount_begin(struct super_block *sb) 891 { 892 struct nfs_server *server; 893 struct rpc_clnt *rpc; 894 895 server = NFS_SB(sb); 896 /* -EIO all pending I/O */ 897 rpc = server->client_acl; 898 if (!IS_ERR(rpc)) 899 rpc_killall_tasks(rpc); 900 rpc = server->client; 901 if (!IS_ERR(rpc)) 902 rpc_killall_tasks(rpc); 903 } 904 EXPORT_SYMBOL_GPL(nfs_umount_begin); 905 906 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 907 { 908 struct nfs_parsed_mount_data *data; 909 910 data = kzalloc(sizeof(*data), GFP_KERNEL); 911 if (data) { 912 data->acregmin = NFS_DEF_ACREGMIN; 913 data->acregmax = NFS_DEF_ACREGMAX; 914 data->acdirmin = NFS_DEF_ACDIRMIN; 915 data->acdirmax = NFS_DEF_ACDIRMAX; 916 data->mount_server.port = NFS_UNSPEC_PORT; 917 data->nfs_server.port = NFS_UNSPEC_PORT; 918 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 919 data->auth_flavors[0] = RPC_AUTH_UNIX; 920 data->auth_flavor_len = 1; 921 data->minorversion = 0; 922 data->need_mount = true; 923 data->net = current->nsproxy->net_ns; 924 security_init_mnt_opts(&data->lsm_opts); 925 } 926 return data; 927 } 928 929 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 930 { 931 if (data) { 932 kfree(data->client_address); 933 kfree(data->mount_server.hostname); 934 kfree(data->nfs_server.export_path); 935 kfree(data->nfs_server.hostname); 936 kfree(data->fscache_uniq); 937 security_free_mnt_opts(&data->lsm_opts); 938 kfree(data); 939 } 940 } 941 942 /* 943 * Sanity-check a server address provided by the mount command. 944 * 945 * Address family must be initialized, and address must not be 946 * the ANY address for that family. 947 */ 948 static int nfs_verify_server_address(struct sockaddr *addr) 949 { 950 switch (addr->sa_family) { 951 case AF_INET: { 952 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 953 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 954 } 955 case AF_INET6: { 956 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 957 return !ipv6_addr_any(sa); 958 } 959 } 960 961 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 962 return 0; 963 } 964 965 /* 966 * Select between a default port value and a user-specified port value. 967 * If a zero value is set, then autobind will be used. 968 */ 969 static void nfs_set_port(struct sockaddr *sap, int *port, 970 const unsigned short default_port) 971 { 972 if (*port == NFS_UNSPEC_PORT) 973 *port = default_port; 974 975 rpc_set_port(sap, *port); 976 } 977 978 /* 979 * Sanity check the NFS transport protocol. 980 * 981 */ 982 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 983 { 984 switch (mnt->nfs_server.protocol) { 985 case XPRT_TRANSPORT_UDP: 986 case XPRT_TRANSPORT_TCP: 987 case XPRT_TRANSPORT_RDMA: 988 break; 989 default: 990 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 991 } 992 } 993 994 /* 995 * For text based NFSv2/v3 mounts, the mount protocol transport default 996 * settings should depend upon the specified NFS transport. 997 */ 998 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 999 { 1000 nfs_validate_transport_protocol(mnt); 1001 1002 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1003 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1004 return; 1005 switch (mnt->nfs_server.protocol) { 1006 case XPRT_TRANSPORT_UDP: 1007 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1008 break; 1009 case XPRT_TRANSPORT_TCP: 1010 case XPRT_TRANSPORT_RDMA: 1011 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1012 } 1013 } 1014 1015 /* 1016 * Parse the value of the 'sec=' option. 1017 */ 1018 static int nfs_parse_security_flavors(char *value, 1019 struct nfs_parsed_mount_data *mnt) 1020 { 1021 substring_t args[MAX_OPT_ARGS]; 1022 1023 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1024 1025 switch (match_token(value, nfs_secflavor_tokens, args)) { 1026 case Opt_sec_none: 1027 mnt->auth_flavors[0] = RPC_AUTH_NULL; 1028 break; 1029 case Opt_sec_sys: 1030 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 1031 break; 1032 case Opt_sec_krb5: 1033 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 1034 break; 1035 case Opt_sec_krb5i: 1036 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 1037 break; 1038 case Opt_sec_krb5p: 1039 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 1040 break; 1041 case Opt_sec_lkey: 1042 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 1043 break; 1044 case Opt_sec_lkeyi: 1045 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 1046 break; 1047 case Opt_sec_lkeyp: 1048 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 1049 break; 1050 case Opt_sec_spkm: 1051 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 1052 break; 1053 case Opt_sec_spkmi: 1054 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 1055 break; 1056 case Opt_sec_spkmp: 1057 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 1058 break; 1059 default: 1060 return 0; 1061 } 1062 1063 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 1064 mnt->auth_flavor_len = 1; 1065 return 1; 1066 } 1067 1068 static int nfs_parse_version_string(char *string, 1069 struct nfs_parsed_mount_data *mnt, 1070 substring_t *args) 1071 { 1072 mnt->flags &= ~NFS_MOUNT_VER3; 1073 switch (match_token(string, nfs_vers_tokens, args)) { 1074 case Opt_vers_2: 1075 mnt->version = 2; 1076 break; 1077 case Opt_vers_3: 1078 mnt->flags |= NFS_MOUNT_VER3; 1079 mnt->version = 3; 1080 break; 1081 case Opt_vers_4: 1082 /* Backward compatibility option. In future, 1083 * the mount program should always supply 1084 * a NFSv4 minor version number. 1085 */ 1086 mnt->version = 4; 1087 break; 1088 case Opt_vers_4_0: 1089 mnt->version = 4; 1090 mnt->minorversion = 0; 1091 break; 1092 case Opt_vers_4_1: 1093 mnt->version = 4; 1094 mnt->minorversion = 1; 1095 break; 1096 default: 1097 return 0; 1098 } 1099 return 1; 1100 } 1101 1102 static int nfs_get_option_str(substring_t args[], char **option) 1103 { 1104 kfree(*option); 1105 *option = match_strdup(args); 1106 return !*option; 1107 } 1108 1109 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1110 { 1111 int rc; 1112 char *string; 1113 1114 string = match_strdup(args); 1115 if (string == NULL) 1116 return -ENOMEM; 1117 rc = kstrtoul(string, 10, option); 1118 kfree(string); 1119 1120 return rc; 1121 } 1122 1123 /* 1124 * Error-check and convert a string of mount options from user space into 1125 * a data structure. The whole mount string is processed; bad options are 1126 * skipped as they are encountered. If there were no errors, return 1; 1127 * otherwise return 0 (zero). 1128 */ 1129 static int nfs_parse_mount_options(char *raw, 1130 struct nfs_parsed_mount_data *mnt) 1131 { 1132 char *p, *string, *secdata; 1133 int rc, sloppy = 0, invalid_option = 0; 1134 unsigned short protofamily = AF_UNSPEC; 1135 unsigned short mountfamily = AF_UNSPEC; 1136 1137 if (!raw) { 1138 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1139 return 1; 1140 } 1141 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1142 1143 secdata = alloc_secdata(); 1144 if (!secdata) 1145 goto out_nomem; 1146 1147 rc = security_sb_copy_data(raw, secdata); 1148 if (rc) 1149 goto out_security_failure; 1150 1151 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1152 if (rc) 1153 goto out_security_failure; 1154 1155 free_secdata(secdata); 1156 1157 while ((p = strsep(&raw, ",")) != NULL) { 1158 substring_t args[MAX_OPT_ARGS]; 1159 unsigned long option; 1160 int token; 1161 1162 if (!*p) 1163 continue; 1164 1165 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1166 1167 token = match_token(p, nfs_mount_option_tokens, args); 1168 switch (token) { 1169 1170 /* 1171 * boolean options: foo/nofoo 1172 */ 1173 case Opt_soft: 1174 mnt->flags |= NFS_MOUNT_SOFT; 1175 break; 1176 case Opt_hard: 1177 mnt->flags &= ~NFS_MOUNT_SOFT; 1178 break; 1179 case Opt_posix: 1180 mnt->flags |= NFS_MOUNT_POSIX; 1181 break; 1182 case Opt_noposix: 1183 mnt->flags &= ~NFS_MOUNT_POSIX; 1184 break; 1185 case Opt_cto: 1186 mnt->flags &= ~NFS_MOUNT_NOCTO; 1187 break; 1188 case Opt_nocto: 1189 mnt->flags |= NFS_MOUNT_NOCTO; 1190 break; 1191 case Opt_ac: 1192 mnt->flags &= ~NFS_MOUNT_NOAC; 1193 break; 1194 case Opt_noac: 1195 mnt->flags |= NFS_MOUNT_NOAC; 1196 break; 1197 case Opt_lock: 1198 mnt->flags &= ~NFS_MOUNT_NONLM; 1199 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1200 NFS_MOUNT_LOCAL_FCNTL); 1201 break; 1202 case Opt_nolock: 1203 mnt->flags |= NFS_MOUNT_NONLM; 1204 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1205 NFS_MOUNT_LOCAL_FCNTL); 1206 break; 1207 case Opt_udp: 1208 mnt->flags &= ~NFS_MOUNT_TCP; 1209 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1210 break; 1211 case Opt_tcp: 1212 mnt->flags |= NFS_MOUNT_TCP; 1213 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1214 break; 1215 case Opt_rdma: 1216 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1217 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1218 xprt_load_transport(p); 1219 break; 1220 case Opt_acl: 1221 mnt->flags &= ~NFS_MOUNT_NOACL; 1222 break; 1223 case Opt_noacl: 1224 mnt->flags |= NFS_MOUNT_NOACL; 1225 break; 1226 case Opt_rdirplus: 1227 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1228 break; 1229 case Opt_nordirplus: 1230 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1231 break; 1232 case Opt_sharecache: 1233 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1234 break; 1235 case Opt_nosharecache: 1236 mnt->flags |= NFS_MOUNT_UNSHARED; 1237 break; 1238 case Opt_resvport: 1239 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1240 break; 1241 case Opt_noresvport: 1242 mnt->flags |= NFS_MOUNT_NORESVPORT; 1243 break; 1244 case Opt_fscache: 1245 mnt->options |= NFS_OPTION_FSCACHE; 1246 kfree(mnt->fscache_uniq); 1247 mnt->fscache_uniq = NULL; 1248 break; 1249 case Opt_nofscache: 1250 mnt->options &= ~NFS_OPTION_FSCACHE; 1251 kfree(mnt->fscache_uniq); 1252 mnt->fscache_uniq = NULL; 1253 break; 1254 case Opt_migration: 1255 mnt->options |= NFS_OPTION_MIGRATION; 1256 break; 1257 case Opt_nomigration: 1258 mnt->options &= NFS_OPTION_MIGRATION; 1259 break; 1260 1261 /* 1262 * options that take numeric values 1263 */ 1264 case Opt_port: 1265 if (nfs_get_option_ul(args, &option) || 1266 option > USHRT_MAX) 1267 goto out_invalid_value; 1268 mnt->nfs_server.port = option; 1269 break; 1270 case Opt_rsize: 1271 if (nfs_get_option_ul(args, &option)) 1272 goto out_invalid_value; 1273 mnt->rsize = option; 1274 break; 1275 case Opt_wsize: 1276 if (nfs_get_option_ul(args, &option)) 1277 goto out_invalid_value; 1278 mnt->wsize = option; 1279 break; 1280 case Opt_bsize: 1281 if (nfs_get_option_ul(args, &option)) 1282 goto out_invalid_value; 1283 mnt->bsize = option; 1284 break; 1285 case Opt_timeo: 1286 if (nfs_get_option_ul(args, &option) || option == 0) 1287 goto out_invalid_value; 1288 mnt->timeo = option; 1289 break; 1290 case Opt_retrans: 1291 if (nfs_get_option_ul(args, &option) || option == 0) 1292 goto out_invalid_value; 1293 mnt->retrans = option; 1294 break; 1295 case Opt_acregmin: 1296 if (nfs_get_option_ul(args, &option)) 1297 goto out_invalid_value; 1298 mnt->acregmin = option; 1299 break; 1300 case Opt_acregmax: 1301 if (nfs_get_option_ul(args, &option)) 1302 goto out_invalid_value; 1303 mnt->acregmax = option; 1304 break; 1305 case Opt_acdirmin: 1306 if (nfs_get_option_ul(args, &option)) 1307 goto out_invalid_value; 1308 mnt->acdirmin = option; 1309 break; 1310 case Opt_acdirmax: 1311 if (nfs_get_option_ul(args, &option)) 1312 goto out_invalid_value; 1313 mnt->acdirmax = option; 1314 break; 1315 case Opt_actimeo: 1316 if (nfs_get_option_ul(args, &option)) 1317 goto out_invalid_value; 1318 mnt->acregmin = mnt->acregmax = 1319 mnt->acdirmin = mnt->acdirmax = option; 1320 break; 1321 case Opt_namelen: 1322 if (nfs_get_option_ul(args, &option)) 1323 goto out_invalid_value; 1324 mnt->namlen = option; 1325 break; 1326 case Opt_mountport: 1327 if (nfs_get_option_ul(args, &option) || 1328 option > USHRT_MAX) 1329 goto out_invalid_value; 1330 mnt->mount_server.port = option; 1331 break; 1332 case Opt_mountvers: 1333 if (nfs_get_option_ul(args, &option) || 1334 option < NFS_MNT_VERSION || 1335 option > NFS_MNT3_VERSION) 1336 goto out_invalid_value; 1337 mnt->mount_server.version = option; 1338 break; 1339 case Opt_minorversion: 1340 if (nfs_get_option_ul(args, &option)) 1341 goto out_invalid_value; 1342 if (option > NFS4_MAX_MINOR_VERSION) 1343 goto out_invalid_value; 1344 mnt->minorversion = option; 1345 break; 1346 1347 /* 1348 * options that take text values 1349 */ 1350 case Opt_nfsvers: 1351 string = match_strdup(args); 1352 if (string == NULL) 1353 goto out_nomem; 1354 rc = nfs_parse_version_string(string, mnt, args); 1355 kfree(string); 1356 if (!rc) 1357 goto out_invalid_value; 1358 break; 1359 case Opt_sec: 1360 string = match_strdup(args); 1361 if (string == NULL) 1362 goto out_nomem; 1363 rc = nfs_parse_security_flavors(string, mnt); 1364 kfree(string); 1365 if (!rc) { 1366 dfprintk(MOUNT, "NFS: unrecognized " 1367 "security flavor\n"); 1368 return 0; 1369 } 1370 break; 1371 case Opt_proto: 1372 string = match_strdup(args); 1373 if (string == NULL) 1374 goto out_nomem; 1375 token = match_token(string, 1376 nfs_xprt_protocol_tokens, args); 1377 1378 protofamily = AF_INET; 1379 switch (token) { 1380 case Opt_xprt_udp6: 1381 protofamily = AF_INET6; 1382 case Opt_xprt_udp: 1383 mnt->flags &= ~NFS_MOUNT_TCP; 1384 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1385 break; 1386 case Opt_xprt_tcp6: 1387 protofamily = AF_INET6; 1388 case Opt_xprt_tcp: 1389 mnt->flags |= NFS_MOUNT_TCP; 1390 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1391 break; 1392 case Opt_xprt_rdma: 1393 /* vector side protocols to TCP */ 1394 mnt->flags |= NFS_MOUNT_TCP; 1395 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1396 xprt_load_transport(string); 1397 break; 1398 default: 1399 dfprintk(MOUNT, "NFS: unrecognized " 1400 "transport protocol\n"); 1401 kfree(string); 1402 return 0; 1403 } 1404 kfree(string); 1405 break; 1406 case Opt_mountproto: 1407 string = match_strdup(args); 1408 if (string == NULL) 1409 goto out_nomem; 1410 token = match_token(string, 1411 nfs_xprt_protocol_tokens, args); 1412 kfree(string); 1413 1414 mountfamily = AF_INET; 1415 switch (token) { 1416 case Opt_xprt_udp6: 1417 mountfamily = AF_INET6; 1418 case Opt_xprt_udp: 1419 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1420 break; 1421 case Opt_xprt_tcp6: 1422 mountfamily = AF_INET6; 1423 case Opt_xprt_tcp: 1424 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1425 break; 1426 case Opt_xprt_rdma: /* not used for side protocols */ 1427 default: 1428 dfprintk(MOUNT, "NFS: unrecognized " 1429 "transport protocol\n"); 1430 return 0; 1431 } 1432 break; 1433 case Opt_addr: 1434 string = match_strdup(args); 1435 if (string == NULL) 1436 goto out_nomem; 1437 mnt->nfs_server.addrlen = 1438 rpc_pton(mnt->net, string, strlen(string), 1439 (struct sockaddr *) 1440 &mnt->nfs_server.address, 1441 sizeof(mnt->nfs_server.address)); 1442 kfree(string); 1443 if (mnt->nfs_server.addrlen == 0) 1444 goto out_invalid_address; 1445 break; 1446 case Opt_clientaddr: 1447 if (nfs_get_option_str(args, &mnt->client_address)) 1448 goto out_nomem; 1449 break; 1450 case Opt_mounthost: 1451 if (nfs_get_option_str(args, 1452 &mnt->mount_server.hostname)) 1453 goto out_nomem; 1454 break; 1455 case Opt_mountaddr: 1456 string = match_strdup(args); 1457 if (string == NULL) 1458 goto out_nomem; 1459 mnt->mount_server.addrlen = 1460 rpc_pton(mnt->net, string, strlen(string), 1461 (struct sockaddr *) 1462 &mnt->mount_server.address, 1463 sizeof(mnt->mount_server.address)); 1464 kfree(string); 1465 if (mnt->mount_server.addrlen == 0) 1466 goto out_invalid_address; 1467 break; 1468 case Opt_lookupcache: 1469 string = match_strdup(args); 1470 if (string == NULL) 1471 goto out_nomem; 1472 token = match_token(string, 1473 nfs_lookupcache_tokens, args); 1474 kfree(string); 1475 switch (token) { 1476 case Opt_lookupcache_all: 1477 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1478 break; 1479 case Opt_lookupcache_positive: 1480 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1481 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1482 break; 1483 case Opt_lookupcache_none: 1484 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1485 break; 1486 default: 1487 dfprintk(MOUNT, "NFS: invalid " 1488 "lookupcache argument\n"); 1489 return 0; 1490 }; 1491 break; 1492 case Opt_fscache_uniq: 1493 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1494 goto out_nomem; 1495 mnt->options |= NFS_OPTION_FSCACHE; 1496 break; 1497 case Opt_local_lock: 1498 string = match_strdup(args); 1499 if (string == NULL) 1500 goto out_nomem; 1501 token = match_token(string, nfs_local_lock_tokens, 1502 args); 1503 kfree(string); 1504 switch (token) { 1505 case Opt_local_lock_all: 1506 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1507 NFS_MOUNT_LOCAL_FCNTL); 1508 break; 1509 case Opt_local_lock_flock: 1510 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1511 break; 1512 case Opt_local_lock_posix: 1513 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1514 break; 1515 case Opt_local_lock_none: 1516 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1517 NFS_MOUNT_LOCAL_FCNTL); 1518 break; 1519 default: 1520 dfprintk(MOUNT, "NFS: invalid " 1521 "local_lock argument\n"); 1522 return 0; 1523 }; 1524 break; 1525 1526 /* 1527 * Special options 1528 */ 1529 case Opt_sloppy: 1530 sloppy = 1; 1531 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1532 break; 1533 case Opt_userspace: 1534 case Opt_deprecated: 1535 dfprintk(MOUNT, "NFS: ignoring mount option " 1536 "'%s'\n", p); 1537 break; 1538 1539 default: 1540 invalid_option = 1; 1541 dfprintk(MOUNT, "NFS: unrecognized mount option " 1542 "'%s'\n", p); 1543 } 1544 } 1545 1546 if (!sloppy && invalid_option) 1547 return 0; 1548 1549 if (mnt->minorversion && mnt->version != 4) 1550 goto out_minorversion_mismatch; 1551 1552 if (mnt->options & NFS_OPTION_MIGRATION && 1553 mnt->version != 4 && mnt->minorversion != 0) 1554 goto out_migration_misuse; 1555 1556 /* 1557 * verify that any proto=/mountproto= options match the address 1558 * families in the addr=/mountaddr= options. 1559 */ 1560 if (protofamily != AF_UNSPEC && 1561 protofamily != mnt->nfs_server.address.ss_family) 1562 goto out_proto_mismatch; 1563 1564 if (mountfamily != AF_UNSPEC) { 1565 if (mnt->mount_server.addrlen) { 1566 if (mountfamily != mnt->mount_server.address.ss_family) 1567 goto out_mountproto_mismatch; 1568 } else { 1569 if (mountfamily != mnt->nfs_server.address.ss_family) 1570 goto out_mountproto_mismatch; 1571 } 1572 } 1573 1574 return 1; 1575 1576 out_mountproto_mismatch: 1577 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1578 "option\n"); 1579 return 0; 1580 out_proto_mismatch: 1581 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1582 return 0; 1583 out_invalid_address: 1584 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1585 return 0; 1586 out_invalid_value: 1587 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1588 return 0; 1589 out_minorversion_mismatch: 1590 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1591 "minorversion=%u\n", mnt->version, mnt->minorversion); 1592 return 0; 1593 out_migration_misuse: 1594 printk(KERN_INFO 1595 "NFS: 'migration' not supported for this NFS version\n"); 1596 return 0; 1597 out_nomem: 1598 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1599 return 0; 1600 out_security_failure: 1601 free_secdata(secdata); 1602 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1603 return 0; 1604 } 1605 1606 /* 1607 * Match the requested auth flavors with the list returned by 1608 * the server. Returns zero and sets the mount's authentication 1609 * flavor on success; returns -EACCES if server does not support 1610 * the requested flavor. 1611 */ 1612 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1613 struct nfs_mount_request *request) 1614 { 1615 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1616 1617 /* 1618 * Certain releases of Linux's mountd return an empty 1619 * flavor list. To prevent behavioral regression with 1620 * these servers (ie. rejecting mounts that used to 1621 * succeed), revert to pre-2.6.32 behavior (no checking) 1622 * if the returned flavor list is empty. 1623 */ 1624 if (server_authlist_len == 0) 1625 return 0; 1626 1627 /* 1628 * We avoid sophisticated negotiating here, as there are 1629 * plenty of cases where we can get it wrong, providing 1630 * either too little or too much security. 1631 * 1632 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1633 * flavor listed first. However, some servers list 1634 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1635 * preferred default, in args->auth_flavors[0] if user 1636 * didn't specify sec= mount option. 1637 */ 1638 for (i = 0; i < args->auth_flavor_len; i++) 1639 for (j = 0; j < server_authlist_len; j++) 1640 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1641 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1642 request->auth_flavs[j]); 1643 args->auth_flavors[0] = request->auth_flavs[j]; 1644 return 0; 1645 } 1646 1647 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1648 nfs_umount(request); 1649 return -EACCES; 1650 } 1651 1652 /* 1653 * Use the remote server's MOUNT service to request the NFS file handle 1654 * corresponding to the provided path. 1655 */ 1656 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1657 struct nfs_fh *root_fh) 1658 { 1659 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1660 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1661 struct nfs_mount_request request = { 1662 .sap = (struct sockaddr *) 1663 &args->mount_server.address, 1664 .dirpath = args->nfs_server.export_path, 1665 .protocol = args->mount_server.protocol, 1666 .fh = root_fh, 1667 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1668 .auth_flav_len = &server_authlist_len, 1669 .auth_flavs = server_authlist, 1670 .net = args->net, 1671 }; 1672 int status; 1673 1674 if (args->mount_server.version == 0) { 1675 switch (args->version) { 1676 default: 1677 args->mount_server.version = NFS_MNT3_VERSION; 1678 break; 1679 case 2: 1680 args->mount_server.version = NFS_MNT_VERSION; 1681 } 1682 } 1683 request.version = args->mount_server.version; 1684 1685 if (args->mount_server.hostname) 1686 request.hostname = args->mount_server.hostname; 1687 else 1688 request.hostname = args->nfs_server.hostname; 1689 1690 /* 1691 * Construct the mount server's address. 1692 */ 1693 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1694 memcpy(request.sap, &args->nfs_server.address, 1695 args->nfs_server.addrlen); 1696 args->mount_server.addrlen = args->nfs_server.addrlen; 1697 } 1698 request.salen = args->mount_server.addrlen; 1699 nfs_set_port(request.sap, &args->mount_server.port, 0); 1700 1701 /* 1702 * Now ask the mount server to map our export path 1703 * to a file handle. 1704 */ 1705 status = nfs_mount(&request); 1706 if (status != 0) { 1707 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1708 request.hostname, status); 1709 return status; 1710 } 1711 1712 /* 1713 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1714 */ 1715 if (args->mount_server.version != NFS_MNT3_VERSION) 1716 return 0; 1717 return nfs_walk_authlist(args, &request); 1718 } 1719 1720 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1721 struct nfs_mount_info *mount_info, 1722 struct nfs_subversion *nfs_mod) 1723 { 1724 int status; 1725 struct nfs_server *server; 1726 1727 if (mount_info->parsed->need_mount) { 1728 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh); 1729 if (status) 1730 return ERR_PTR(status); 1731 } 1732 1733 /* Get a volume representation */ 1734 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1735 if (IS_ERR(server)) 1736 return ERR_CAST(server); 1737 1738 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1739 } 1740 EXPORT_SYMBOL_GPL(nfs_try_mount); 1741 1742 /* 1743 * Split "dev_name" into "hostname:export_path". 1744 * 1745 * The leftmost colon demarks the split between the server's hostname 1746 * and the export path. If the hostname starts with a left square 1747 * bracket, then it may contain colons. 1748 * 1749 * Note: caller frees hostname and export path, even on error. 1750 */ 1751 static int nfs_parse_devname(const char *dev_name, 1752 char **hostname, size_t maxnamlen, 1753 char **export_path, size_t maxpathlen) 1754 { 1755 size_t len; 1756 char *end; 1757 1758 /* Is the host name protected with square brakcets? */ 1759 if (*dev_name == '[') { 1760 end = strchr(++dev_name, ']'); 1761 if (end == NULL || end[1] != ':') 1762 goto out_bad_devname; 1763 1764 len = end - dev_name; 1765 end++; 1766 } else { 1767 char *comma; 1768 1769 end = strchr(dev_name, ':'); 1770 if (end == NULL) 1771 goto out_bad_devname; 1772 len = end - dev_name; 1773 1774 /* kill possible hostname list: not supported */ 1775 comma = strchr(dev_name, ','); 1776 if (comma != NULL && comma < end) 1777 *comma = 0; 1778 } 1779 1780 if (len > maxnamlen) 1781 goto out_hostname; 1782 1783 /* N.B. caller will free nfs_server.hostname in all cases */ 1784 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1785 if (*hostname == NULL) 1786 goto out_nomem; 1787 len = strlen(++end); 1788 if (len > maxpathlen) 1789 goto out_path; 1790 *export_path = kstrndup(end, len, GFP_KERNEL); 1791 if (!*export_path) 1792 goto out_nomem; 1793 1794 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1795 return 0; 1796 1797 out_bad_devname: 1798 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1799 return -EINVAL; 1800 1801 out_nomem: 1802 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1803 return -ENOMEM; 1804 1805 out_hostname: 1806 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1807 return -ENAMETOOLONG; 1808 1809 out_path: 1810 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1811 return -ENAMETOOLONG; 1812 } 1813 1814 /* 1815 * Validate the NFS2/NFS3 mount data 1816 * - fills in the mount root filehandle 1817 * 1818 * For option strings, user space handles the following behaviors: 1819 * 1820 * + DNS: mapping server host name to IP address ("addr=" option) 1821 * 1822 * + failure mode: how to behave if a mount request can't be handled 1823 * immediately ("fg/bg" option) 1824 * 1825 * + retry: how often to retry a mount request ("retry=" option) 1826 * 1827 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1828 * mountproto=tcp after mountproto=udp, and so on 1829 */ 1830 static int nfs23_validate_mount_data(void *options, 1831 struct nfs_parsed_mount_data *args, 1832 struct nfs_fh *mntfh, 1833 const char *dev_name) 1834 { 1835 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1836 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1837 1838 if (data == NULL) 1839 goto out_no_data; 1840 1841 args->version = NFS_DEFAULT_VERSION; 1842 switch (data->version) { 1843 case 1: 1844 data->namlen = 0; 1845 case 2: 1846 data->bsize = 0; 1847 case 3: 1848 if (data->flags & NFS_MOUNT_VER3) 1849 goto out_no_v3; 1850 data->root.size = NFS2_FHSIZE; 1851 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1852 case 4: 1853 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1854 goto out_no_sec; 1855 case 5: 1856 memset(data->context, 0, sizeof(data->context)); 1857 case 6: 1858 if (data->flags & NFS_MOUNT_VER3) { 1859 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1860 goto out_invalid_fh; 1861 mntfh->size = data->root.size; 1862 args->version = 3; 1863 } else { 1864 mntfh->size = NFS2_FHSIZE; 1865 args->version = 2; 1866 } 1867 1868 1869 memcpy(mntfh->data, data->root.data, mntfh->size); 1870 if (mntfh->size < sizeof(mntfh->data)) 1871 memset(mntfh->data + mntfh->size, 0, 1872 sizeof(mntfh->data) - mntfh->size); 1873 1874 /* 1875 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1876 * can deal with. 1877 */ 1878 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1879 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1880 args->rsize = data->rsize; 1881 args->wsize = data->wsize; 1882 args->timeo = data->timeo; 1883 args->retrans = data->retrans; 1884 args->acregmin = data->acregmin; 1885 args->acregmax = data->acregmax; 1886 args->acdirmin = data->acdirmin; 1887 args->acdirmax = data->acdirmax; 1888 args->need_mount = false; 1889 1890 memcpy(sap, &data->addr, sizeof(data->addr)); 1891 args->nfs_server.addrlen = sizeof(data->addr); 1892 args->nfs_server.port = ntohs(data->addr.sin_port); 1893 if (!nfs_verify_server_address(sap)) 1894 goto out_no_address; 1895 1896 if (!(data->flags & NFS_MOUNT_TCP)) 1897 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1898 /* N.B. caller will free nfs_server.hostname in all cases */ 1899 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1900 args->namlen = data->namlen; 1901 args->bsize = data->bsize; 1902 1903 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1904 args->auth_flavors[0] = data->pseudoflavor; 1905 if (!args->nfs_server.hostname) 1906 goto out_nomem; 1907 1908 if (!(data->flags & NFS_MOUNT_NONLM)) 1909 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1910 NFS_MOUNT_LOCAL_FCNTL); 1911 else 1912 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1913 NFS_MOUNT_LOCAL_FCNTL); 1914 /* 1915 * The legacy version 6 binary mount data from userspace has a 1916 * field used only to transport selinux information into the 1917 * the kernel. To continue to support that functionality we 1918 * have a touch of selinux knowledge here in the NFS code. The 1919 * userspace code converted context=blah to just blah so we are 1920 * converting back to the full string selinux understands. 1921 */ 1922 if (data->context[0]){ 1923 #ifdef CONFIG_SECURITY_SELINUX 1924 int rc; 1925 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1926 if (!opts_str) 1927 return -ENOMEM; 1928 strcpy(opts_str, "context="); 1929 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1930 strcat(opts_str, &data->context[0]); 1931 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1932 kfree(opts_str); 1933 if (rc) 1934 return rc; 1935 #else 1936 return -EINVAL; 1937 #endif 1938 } 1939 1940 break; 1941 default: 1942 return NFS_TEXT_DATA; 1943 } 1944 1945 #if !IS_ENABLED(CONFIG_NFS_V3) 1946 if (args->version == 3) 1947 goto out_v3_not_compiled; 1948 #endif /* !CONFIG_NFS_V3 */ 1949 1950 return 0; 1951 1952 out_no_data: 1953 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1954 return -EINVAL; 1955 1956 out_no_v3: 1957 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1958 data->version); 1959 return -EINVAL; 1960 1961 out_no_sec: 1962 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1963 return -EINVAL; 1964 1965 #if !IS_ENABLED(CONFIG_NFS_V3) 1966 out_v3_not_compiled: 1967 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1968 return -EPROTONOSUPPORT; 1969 #endif /* !CONFIG_NFS_V3 */ 1970 1971 out_nomem: 1972 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1973 return -ENOMEM; 1974 1975 out_no_address: 1976 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1977 return -EINVAL; 1978 1979 out_invalid_fh: 1980 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1981 return -EINVAL; 1982 } 1983 1984 #if IS_ENABLED(CONFIG_NFS_V4) 1985 static int nfs_validate_mount_data(struct file_system_type *fs_type, 1986 void *options, 1987 struct nfs_parsed_mount_data *args, 1988 struct nfs_fh *mntfh, 1989 const char *dev_name) 1990 { 1991 if (fs_type == &nfs_fs_type) 1992 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 1993 return nfs4_validate_mount_data(options, args, dev_name); 1994 } 1995 #else 1996 static int nfs_validate_mount_data(struct file_system_type *fs_type, 1997 void *options, 1998 struct nfs_parsed_mount_data *args, 1999 struct nfs_fh *mntfh, 2000 const char *dev_name) 2001 { 2002 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2003 } 2004 #endif 2005 2006 static int nfs_validate_text_mount_data(void *options, 2007 struct nfs_parsed_mount_data *args, 2008 const char *dev_name) 2009 { 2010 int port = 0; 2011 int max_namelen = PAGE_SIZE; 2012 int max_pathlen = NFS_MAXPATHLEN; 2013 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2014 2015 if (nfs_parse_mount_options((char *)options, args) == 0) 2016 return -EINVAL; 2017 2018 if (!nfs_verify_server_address(sap)) 2019 goto out_no_address; 2020 2021 if (args->version == 4) { 2022 #if IS_ENABLED(CONFIG_NFS_V4) 2023 port = NFS_PORT; 2024 max_namelen = NFS4_MAXNAMLEN; 2025 max_pathlen = NFS4_MAXPATHLEN; 2026 nfs_validate_transport_protocol(args); 2027 nfs4_validate_mount_flags(args); 2028 #else 2029 goto out_v4_not_compiled; 2030 #endif /* CONFIG_NFS_V4 */ 2031 } else 2032 nfs_set_mount_transport_protocol(args); 2033 2034 nfs_set_port(sap, &args->nfs_server.port, port); 2035 2036 if (args->auth_flavor_len > 1) 2037 goto out_bad_auth; 2038 2039 return nfs_parse_devname(dev_name, 2040 &args->nfs_server.hostname, 2041 max_namelen, 2042 &args->nfs_server.export_path, 2043 max_pathlen); 2044 2045 #if !IS_ENABLED(CONFIG_NFS_V4) 2046 out_v4_not_compiled: 2047 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2048 return -EPROTONOSUPPORT; 2049 #endif /* !CONFIG_NFS_V4 */ 2050 2051 out_no_address: 2052 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2053 return -EINVAL; 2054 2055 out_bad_auth: 2056 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n"); 2057 return -EINVAL; 2058 } 2059 2060 static int 2061 nfs_compare_remount_data(struct nfs_server *nfss, 2062 struct nfs_parsed_mount_data *data) 2063 { 2064 if (data->flags != nfss->flags || 2065 data->rsize != nfss->rsize || 2066 data->wsize != nfss->wsize || 2067 data->retrans != nfss->client->cl_timeout->to_retries || 2068 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2069 data->acregmin != nfss->acregmin / HZ || 2070 data->acregmax != nfss->acregmax / HZ || 2071 data->acdirmin != nfss->acdirmin / HZ || 2072 data->acdirmax != nfss->acdirmax / HZ || 2073 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2074 data->nfs_server.port != nfss->port || 2075 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2076 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2077 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2078 return -EINVAL; 2079 2080 return 0; 2081 } 2082 2083 int 2084 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2085 { 2086 int error; 2087 struct nfs_server *nfss = sb->s_fs_info; 2088 struct nfs_parsed_mount_data *data; 2089 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2090 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2091 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2092 2093 /* 2094 * Userspace mount programs that send binary options generally send 2095 * them populated with default values. We have no way to know which 2096 * ones were explicitly specified. Fall back to legacy behavior and 2097 * just return success. 2098 */ 2099 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2100 (nfsvers <= 3 && (!options || (options->version >= 1 && 2101 options->version <= 6)))) 2102 return 0; 2103 2104 data = kzalloc(sizeof(*data), GFP_KERNEL); 2105 if (data == NULL) 2106 return -ENOMEM; 2107 2108 /* fill out struct with values from existing mount */ 2109 data->flags = nfss->flags; 2110 data->rsize = nfss->rsize; 2111 data->wsize = nfss->wsize; 2112 data->retrans = nfss->client->cl_timeout->to_retries; 2113 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2114 data->acregmin = nfss->acregmin / HZ; 2115 data->acregmax = nfss->acregmax / HZ; 2116 data->acdirmin = nfss->acdirmin / HZ; 2117 data->acdirmax = nfss->acdirmax / HZ; 2118 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2119 data->nfs_server.port = nfss->port; 2120 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2121 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2122 data->nfs_server.addrlen); 2123 2124 /* overwrite those values with any that were specified */ 2125 error = nfs_parse_mount_options((char *)options, data); 2126 if (error < 0) 2127 goto out; 2128 2129 /* 2130 * noac is a special case. It implies -o sync, but that's not 2131 * necessarily reflected in the mtab options. do_remount_sb 2132 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2133 * remount options, so we have to explicitly reset it. 2134 */ 2135 if (data->flags & NFS_MOUNT_NOAC) 2136 *flags |= MS_SYNCHRONOUS; 2137 2138 /* compare new mount options with old ones */ 2139 error = nfs_compare_remount_data(nfss, data); 2140 out: 2141 kfree(data); 2142 return error; 2143 } 2144 EXPORT_SYMBOL_GPL(nfs_remount); 2145 2146 /* 2147 * Initialise the common bits of the superblock 2148 */ 2149 inline void nfs_initialise_sb(struct super_block *sb) 2150 { 2151 struct nfs_server *server = NFS_SB(sb); 2152 2153 sb->s_magic = NFS_SUPER_MAGIC; 2154 2155 /* We probably want something more informative here */ 2156 snprintf(sb->s_id, sizeof(sb->s_id), 2157 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2158 2159 if (sb->s_blocksize == 0) 2160 sb->s_blocksize = nfs_block_bits(server->wsize, 2161 &sb->s_blocksize_bits); 2162 2163 sb->s_bdi = &server->backing_dev_info; 2164 2165 nfs_super_set_maxbytes(sb, server->maxfilesize); 2166 } 2167 2168 /* 2169 * Finish setting up an NFS2/3 superblock 2170 */ 2171 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2172 { 2173 struct nfs_parsed_mount_data *data = mount_info->parsed; 2174 struct nfs_server *server = NFS_SB(sb); 2175 2176 sb->s_blocksize_bits = 0; 2177 sb->s_blocksize = 0; 2178 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2179 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2180 if (data && data->bsize) 2181 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2182 2183 if (server->nfs_client->rpc_ops->version != 2) { 2184 /* The VFS shouldn't apply the umask to mode bits. We will do 2185 * so ourselves when necessary. 2186 */ 2187 sb->s_flags |= MS_POSIXACL; 2188 sb->s_time_gran = 1; 2189 } 2190 2191 nfs_initialise_sb(sb); 2192 } 2193 EXPORT_SYMBOL_GPL(nfs_fill_super); 2194 2195 /* 2196 * Finish setting up a cloned NFS2/3/4 superblock 2197 */ 2198 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2199 { 2200 const struct super_block *old_sb = mount_info->cloned->sb; 2201 struct nfs_server *server = NFS_SB(sb); 2202 2203 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2204 sb->s_blocksize = old_sb->s_blocksize; 2205 sb->s_maxbytes = old_sb->s_maxbytes; 2206 sb->s_xattr = old_sb->s_xattr; 2207 sb->s_op = old_sb->s_op; 2208 sb->s_time_gran = 1; 2209 2210 if (server->nfs_client->rpc_ops->version != 2) { 2211 /* The VFS shouldn't apply the umask to mode bits. We will do 2212 * so ourselves when necessary. 2213 */ 2214 sb->s_flags |= MS_POSIXACL; 2215 } 2216 2217 nfs_initialise_sb(sb); 2218 } 2219 2220 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2221 { 2222 const struct nfs_server *a = s->s_fs_info; 2223 const struct rpc_clnt *clnt_a = a->client; 2224 const struct rpc_clnt *clnt_b = b->client; 2225 2226 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2227 goto Ebusy; 2228 if (a->nfs_client != b->nfs_client) 2229 goto Ebusy; 2230 if (a->flags != b->flags) 2231 goto Ebusy; 2232 if (a->wsize != b->wsize) 2233 goto Ebusy; 2234 if (a->rsize != b->rsize) 2235 goto Ebusy; 2236 if (a->acregmin != b->acregmin) 2237 goto Ebusy; 2238 if (a->acregmax != b->acregmax) 2239 goto Ebusy; 2240 if (a->acdirmin != b->acdirmin) 2241 goto Ebusy; 2242 if (a->acdirmax != b->acdirmax) 2243 goto Ebusy; 2244 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2245 goto Ebusy; 2246 return 1; 2247 Ebusy: 2248 return 0; 2249 } 2250 2251 struct nfs_sb_mountdata { 2252 struct nfs_server *server; 2253 int mntflags; 2254 }; 2255 2256 static int nfs_set_super(struct super_block *s, void *data) 2257 { 2258 struct nfs_sb_mountdata *sb_mntdata = data; 2259 struct nfs_server *server = sb_mntdata->server; 2260 int ret; 2261 2262 s->s_flags = sb_mntdata->mntflags; 2263 s->s_fs_info = server; 2264 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2265 ret = set_anon_super(s, server); 2266 if (ret == 0) 2267 server->s_dev = s->s_dev; 2268 return ret; 2269 } 2270 2271 static int nfs_compare_super_address(struct nfs_server *server1, 2272 struct nfs_server *server2) 2273 { 2274 struct sockaddr *sap1, *sap2; 2275 2276 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2277 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2278 2279 if (sap1->sa_family != sap2->sa_family) 2280 return 0; 2281 2282 switch (sap1->sa_family) { 2283 case AF_INET: { 2284 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2285 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2286 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2287 return 0; 2288 if (sin1->sin_port != sin2->sin_port) 2289 return 0; 2290 break; 2291 } 2292 case AF_INET6: { 2293 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2294 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2295 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2296 return 0; 2297 if (sin1->sin6_port != sin2->sin6_port) 2298 return 0; 2299 break; 2300 } 2301 default: 2302 return 0; 2303 } 2304 2305 return 1; 2306 } 2307 2308 static int nfs_compare_super(struct super_block *sb, void *data) 2309 { 2310 struct nfs_sb_mountdata *sb_mntdata = data; 2311 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2312 int mntflags = sb_mntdata->mntflags; 2313 2314 if (!nfs_compare_super_address(old, server)) 2315 return 0; 2316 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2317 if (old->flags & NFS_MOUNT_UNSHARED) 2318 return 0; 2319 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2320 return 0; 2321 return nfs_compare_mount_options(sb, server, mntflags); 2322 } 2323 2324 #ifdef CONFIG_NFS_FSCACHE 2325 static void nfs_get_cache_cookie(struct super_block *sb, 2326 struct nfs_parsed_mount_data *parsed, 2327 struct nfs_clone_mount *cloned) 2328 { 2329 struct nfs_server *nfss = NFS_SB(sb); 2330 char *uniq = NULL; 2331 int ulen = 0; 2332 2333 nfss->fscache_key = NULL; 2334 nfss->fscache = NULL; 2335 2336 if (parsed) { 2337 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2338 return; 2339 if (parsed->fscache_uniq) { 2340 uniq = parsed->fscache_uniq; 2341 ulen = strlen(parsed->fscache_uniq); 2342 } 2343 } else if (cloned) { 2344 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2345 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2346 return; 2347 if (mnt_s->fscache_key) { 2348 uniq = mnt_s->fscache_key->key.uniquifier; 2349 ulen = mnt_s->fscache_key->key.uniq_len; 2350 }; 2351 } else 2352 return; 2353 2354 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2355 } 2356 #else 2357 static void nfs_get_cache_cookie(struct super_block *sb, 2358 struct nfs_parsed_mount_data *parsed, 2359 struct nfs_clone_mount *cloned) 2360 { 2361 } 2362 #endif 2363 2364 static int nfs_bdi_register(struct nfs_server *server) 2365 { 2366 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2367 } 2368 2369 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2370 struct nfs_mount_info *mount_info) 2371 { 2372 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts); 2373 } 2374 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2375 2376 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2377 struct nfs_mount_info *mount_info) 2378 { 2379 /* clone any lsm security options from the parent to the new sb */ 2380 security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2381 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2382 return -ESTALE; 2383 return 0; 2384 } 2385 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2386 2387 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2388 int flags, const char *dev_name, 2389 struct nfs_mount_info *mount_info, 2390 struct nfs_subversion *nfs_mod) 2391 { 2392 struct super_block *s; 2393 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2394 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2395 struct nfs_sb_mountdata sb_mntdata = { 2396 .mntflags = flags, 2397 .server = server, 2398 }; 2399 int error; 2400 2401 if (server->flags & NFS_MOUNT_UNSHARED) 2402 compare_super = NULL; 2403 2404 /* -o noac implies -o sync */ 2405 if (server->flags & NFS_MOUNT_NOAC) 2406 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2407 2408 /* Get a superblock - note that we may end up sharing one that already exists */ 2409 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2410 if (IS_ERR(s)) { 2411 mntroot = ERR_CAST(s); 2412 goto out_err_nosb; 2413 } 2414 2415 if (s->s_fs_info != server) { 2416 nfs_free_server(server); 2417 server = NULL; 2418 } else { 2419 error = nfs_bdi_register(server); 2420 if (error) { 2421 mntroot = ERR_PTR(error); 2422 goto error_splat_bdi; 2423 } 2424 } 2425 2426 if (!s->s_root) { 2427 /* initial superblock/root creation */ 2428 mount_info->fill_super(s, mount_info); 2429 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2430 } 2431 2432 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2433 if (IS_ERR(mntroot)) 2434 goto error_splat_super; 2435 2436 error = mount_info->set_security(s, mntroot, mount_info); 2437 if (error) 2438 goto error_splat_root; 2439 2440 s->s_flags |= MS_ACTIVE; 2441 2442 out: 2443 return mntroot; 2444 2445 out_err_nosb: 2446 nfs_free_server(server); 2447 goto out; 2448 2449 error_splat_root: 2450 dput(mntroot); 2451 mntroot = ERR_PTR(error); 2452 error_splat_super: 2453 if (server && !s->s_root) 2454 bdi_unregister(&server->backing_dev_info); 2455 error_splat_bdi: 2456 deactivate_locked_super(s); 2457 goto out; 2458 } 2459 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2460 2461 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2462 int flags, const char *dev_name, void *raw_data) 2463 { 2464 struct nfs_mount_info mount_info = { 2465 .fill_super = nfs_fill_super, 2466 .set_security = nfs_set_sb_security, 2467 }; 2468 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2469 struct nfs_subversion *nfs_mod; 2470 int error; 2471 2472 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2473 mount_info.mntfh = nfs_alloc_fhandle(); 2474 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2475 goto out; 2476 2477 /* Validate the mount data */ 2478 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2479 if (error == NFS_TEXT_DATA) 2480 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2481 if (error < 0) { 2482 mntroot = ERR_PTR(error); 2483 goto out; 2484 } 2485 2486 nfs_mod = get_nfs_version(mount_info.parsed->version); 2487 if (IS_ERR(nfs_mod)) { 2488 mntroot = ERR_CAST(nfs_mod); 2489 goto out; 2490 } 2491 2492 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2493 2494 put_nfs_version(nfs_mod); 2495 out: 2496 nfs_free_parsed_mount_data(mount_info.parsed); 2497 nfs_free_fhandle(mount_info.mntfh); 2498 return mntroot; 2499 } 2500 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2501 2502 /* 2503 * Ensure that we unregister the bdi before kill_anon_super 2504 * releases the device name 2505 */ 2506 void nfs_put_super(struct super_block *s) 2507 { 2508 struct nfs_server *server = NFS_SB(s); 2509 2510 bdi_unregister(&server->backing_dev_info); 2511 } 2512 EXPORT_SYMBOL_GPL(nfs_put_super); 2513 2514 /* 2515 * Destroy an NFS2/3 superblock 2516 */ 2517 void nfs_kill_super(struct super_block *s) 2518 { 2519 struct nfs_server *server = NFS_SB(s); 2520 2521 kill_anon_super(s); 2522 nfs_fscache_release_super_cookie(s); 2523 nfs_free_server(server); 2524 } 2525 EXPORT_SYMBOL_GPL(nfs_kill_super); 2526 2527 /* 2528 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2529 */ 2530 static struct dentry * 2531 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2532 const char *dev_name, void *raw_data) 2533 { 2534 struct nfs_clone_mount *data = raw_data; 2535 struct nfs_mount_info mount_info = { 2536 .fill_super = nfs_clone_super, 2537 .set_security = nfs_clone_sb_security, 2538 .cloned = data, 2539 }; 2540 struct nfs_server *server; 2541 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2542 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2543 2544 dprintk("--> nfs_xdev_mount()\n"); 2545 2546 mount_info.mntfh = mount_info.cloned->fh; 2547 2548 /* create a new volume representation */ 2549 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2550 2551 if (IS_ERR(server)) 2552 mntroot = ERR_CAST(server); 2553 else 2554 mntroot = nfs_fs_mount_common(server, flags, 2555 dev_name, &mount_info, nfs_mod); 2556 2557 dprintk("<-- nfs_xdev_mount() = %ld\n", 2558 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2559 return mntroot; 2560 } 2561 2562 #if IS_ENABLED(CONFIG_NFS_V4) 2563 2564 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2565 { 2566 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2567 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2568 } 2569 2570 /* 2571 * Validate NFSv4 mount options 2572 */ 2573 static int nfs4_validate_mount_data(void *options, 2574 struct nfs_parsed_mount_data *args, 2575 const char *dev_name) 2576 { 2577 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2578 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2579 char *c; 2580 2581 if (data == NULL) 2582 goto out_no_data; 2583 2584 args->version = 4; 2585 2586 switch (data->version) { 2587 case 1: 2588 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2589 goto out_no_address; 2590 if (data->host_addrlen == 0) 2591 goto out_no_address; 2592 args->nfs_server.addrlen = data->host_addrlen; 2593 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2594 return -EFAULT; 2595 if (!nfs_verify_server_address(sap)) 2596 goto out_no_address; 2597 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2598 2599 if (data->auth_flavourlen) { 2600 if (data->auth_flavourlen > 1) 2601 goto out_inval_auth; 2602 if (copy_from_user(&args->auth_flavors[0], 2603 data->auth_flavours, 2604 sizeof(args->auth_flavors[0]))) 2605 return -EFAULT; 2606 } 2607 2608 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2609 if (IS_ERR(c)) 2610 return PTR_ERR(c); 2611 args->nfs_server.hostname = c; 2612 2613 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2614 if (IS_ERR(c)) 2615 return PTR_ERR(c); 2616 args->nfs_server.export_path = c; 2617 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2618 2619 c = strndup_user(data->client_addr.data, 16); 2620 if (IS_ERR(c)) 2621 return PTR_ERR(c); 2622 args->client_address = c; 2623 2624 /* 2625 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2626 * can deal with. 2627 */ 2628 2629 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2630 args->rsize = data->rsize; 2631 args->wsize = data->wsize; 2632 args->timeo = data->timeo; 2633 args->retrans = data->retrans; 2634 args->acregmin = data->acregmin; 2635 args->acregmax = data->acregmax; 2636 args->acdirmin = data->acdirmin; 2637 args->acdirmax = data->acdirmax; 2638 args->nfs_server.protocol = data->proto; 2639 nfs_validate_transport_protocol(args); 2640 2641 break; 2642 default: 2643 return NFS_TEXT_DATA; 2644 } 2645 2646 return 0; 2647 2648 out_no_data: 2649 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2650 return -EINVAL; 2651 2652 out_inval_auth: 2653 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2654 data->auth_flavourlen); 2655 return -EINVAL; 2656 2657 out_no_address: 2658 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2659 return -EINVAL; 2660 } 2661 2662 /* 2663 * NFS v4 module parameters need to stay in the 2664 * NFS client for backwards compatibility 2665 */ 2666 unsigned int nfs_callback_set_tcpport; 2667 unsigned short nfs_callback_tcpport; 2668 /* Default cache timeout is 10 minutes */ 2669 unsigned int nfs_idmap_cache_timeout = 600; 2670 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2671 bool nfs4_disable_idmapping = true; 2672 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2673 unsigned short send_implementation_id = 1; 2674 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2675 2676 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2677 EXPORT_SYMBOL_GPL(nfs_callback_tcpport); 2678 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2679 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2680 EXPORT_SYMBOL_GPL(max_session_slots); 2681 EXPORT_SYMBOL_GPL(send_implementation_id); 2682 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2683 2684 #define NFS_CALLBACK_MAXPORTNR (65535U) 2685 2686 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2687 { 2688 unsigned long num; 2689 int ret; 2690 2691 if (!val) 2692 return -EINVAL; 2693 ret = kstrtoul(val, 0, &num); 2694 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2695 return -EINVAL; 2696 *((unsigned int *)kp->arg) = num; 2697 return 0; 2698 } 2699 static struct kernel_param_ops param_ops_portnr = { 2700 .set = param_set_portnr, 2701 .get = param_get_uint, 2702 }; 2703 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2704 2705 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2706 module_param(nfs_idmap_cache_timeout, int, 0644); 2707 module_param(nfs4_disable_idmapping, bool, 0644); 2708 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2709 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2710 MODULE_PARM_DESC(nfs4_disable_idmapping, 2711 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2712 module_param(max_session_slots, ushort, 0644); 2713 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2714 "requests the client will negotiate"); 2715 module_param(send_implementation_id, ushort, 0644); 2716 MODULE_PARM_DESC(send_implementation_id, 2717 "Send implementation ID with NFSv4.1 exchange_id"); 2718 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2719 MODULE_ALIAS("nfs4"); 2720 2721 #endif /* CONFIG_NFS_V4 */ 2722