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, 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" }, 283 284 { Opt_vers_err, NULL } 285 }; 286 287 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 288 int flags, const char *dev_name, void *raw_data); 289 290 struct file_system_type nfs_fs_type = { 291 .owner = THIS_MODULE, 292 .name = "nfs", 293 .mount = nfs_fs_mount, 294 .kill_sb = nfs_kill_super, 295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 296 }; 297 EXPORT_SYMBOL_GPL(nfs_fs_type); 298 299 struct file_system_type nfs_xdev_fs_type = { 300 .owner = THIS_MODULE, 301 .name = "nfs", 302 .mount = nfs_xdev_mount, 303 .kill_sb = nfs_kill_super, 304 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 305 }; 306 307 const struct super_operations nfs_sops = { 308 .alloc_inode = nfs_alloc_inode, 309 .destroy_inode = nfs_destroy_inode, 310 .write_inode = nfs_write_inode, 311 .drop_inode = nfs_drop_inode, 312 .put_super = nfs_put_super, 313 .statfs = nfs_statfs, 314 .evict_inode = nfs_evict_inode, 315 .umount_begin = nfs_umount_begin, 316 .show_options = nfs_show_options, 317 .show_devname = nfs_show_devname, 318 .show_path = nfs_show_path, 319 .show_stats = nfs_show_stats, 320 .remount_fs = nfs_remount, 321 }; 322 EXPORT_SYMBOL_GPL(nfs_sops); 323 324 #if IS_ENABLED(CONFIG_NFS_V4) 325 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 326 static int nfs4_validate_mount_data(void *options, 327 struct nfs_parsed_mount_data *args, const char *dev_name); 328 329 struct file_system_type nfs4_fs_type = { 330 .owner = THIS_MODULE, 331 .name = "nfs4", 332 .mount = nfs_fs_mount, 333 .kill_sb = nfs_kill_super, 334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 335 }; 336 EXPORT_SYMBOL_GPL(nfs4_fs_type); 337 338 static int __init register_nfs4_fs(void) 339 { 340 return register_filesystem(&nfs4_fs_type); 341 } 342 343 static void unregister_nfs4_fs(void) 344 { 345 unregister_filesystem(&nfs4_fs_type); 346 } 347 #else 348 static int __init register_nfs4_fs(void) 349 { 350 return 0; 351 } 352 353 static void unregister_nfs4_fs(void) 354 { 355 } 356 #endif 357 358 static struct shrinker acl_shrinker = { 359 .shrink = nfs_access_cache_shrinker, 360 .seeks = DEFAULT_SEEKS, 361 }; 362 363 /* 364 * Register the NFS filesystems 365 */ 366 int __init register_nfs_fs(void) 367 { 368 int ret; 369 370 ret = register_filesystem(&nfs_fs_type); 371 if (ret < 0) 372 goto error_0; 373 374 ret = register_nfs4_fs(); 375 if (ret < 0) 376 goto error_1; 377 378 ret = nfs_register_sysctl(); 379 if (ret < 0) 380 goto error_2; 381 register_shrinker(&acl_shrinker); 382 return 0; 383 384 error_2: 385 unregister_nfs4_fs(); 386 error_1: 387 unregister_filesystem(&nfs_fs_type); 388 error_0: 389 return ret; 390 } 391 392 /* 393 * Unregister the NFS filesystems 394 */ 395 void __exit unregister_nfs_fs(void) 396 { 397 unregister_shrinker(&acl_shrinker); 398 nfs_unregister_sysctl(); 399 unregister_nfs4_fs(); 400 unregister_filesystem(&nfs_fs_type); 401 } 402 403 void nfs_sb_active(struct super_block *sb) 404 { 405 struct nfs_server *server = NFS_SB(sb); 406 407 if (atomic_inc_return(&server->active) == 1) 408 atomic_inc(&sb->s_active); 409 } 410 EXPORT_SYMBOL_GPL(nfs_sb_active); 411 412 void nfs_sb_deactive(struct super_block *sb) 413 { 414 struct nfs_server *server = NFS_SB(sb); 415 416 if (atomic_dec_and_test(&server->active)) 417 deactivate_super(sb); 418 } 419 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 420 421 /* 422 * Deliver file system statistics to userspace 423 */ 424 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 425 { 426 struct nfs_server *server = NFS_SB(dentry->d_sb); 427 unsigned char blockbits; 428 unsigned long blockres; 429 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 430 struct nfs_fsstat res; 431 int error = -ENOMEM; 432 433 res.fattr = nfs_alloc_fattr(); 434 if (res.fattr == NULL) 435 goto out_err; 436 437 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 438 if (unlikely(error == -ESTALE)) { 439 struct dentry *pd_dentry; 440 441 pd_dentry = dget_parent(dentry); 442 if (pd_dentry != NULL) { 443 nfs_zap_caches(pd_dentry->d_inode); 444 dput(pd_dentry); 445 } 446 } 447 nfs_free_fattr(res.fattr); 448 if (error < 0) 449 goto out_err; 450 451 buf->f_type = NFS_SUPER_MAGIC; 452 453 /* 454 * Current versions of glibc do not correctly handle the 455 * case where f_frsize != f_bsize. Eventually we want to 456 * report the value of wtmult in this field. 457 */ 458 buf->f_frsize = dentry->d_sb->s_blocksize; 459 460 /* 461 * On most *nix systems, f_blocks, f_bfree, and f_bavail 462 * are reported in units of f_frsize. Linux hasn't had 463 * an f_frsize field in its statfs struct until recently, 464 * thus historically Linux's sys_statfs reports these 465 * fields in units of f_bsize. 466 */ 467 buf->f_bsize = dentry->d_sb->s_blocksize; 468 blockbits = dentry->d_sb->s_blocksize_bits; 469 blockres = (1 << blockbits) - 1; 470 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 471 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 472 buf->f_bavail = (res.abytes + blockres) >> blockbits; 473 474 buf->f_files = res.tfiles; 475 buf->f_ffree = res.afiles; 476 477 buf->f_namelen = server->namelen; 478 479 return 0; 480 481 out_err: 482 dprintk("%s: statfs error = %d\n", __func__, -error); 483 return error; 484 } 485 EXPORT_SYMBOL_GPL(nfs_statfs); 486 487 /* 488 * Map the security flavour number to a name 489 */ 490 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 491 { 492 static const struct { 493 rpc_authflavor_t flavour; 494 const char *str; 495 } sec_flavours[] = { 496 { RPC_AUTH_NULL, "null" }, 497 { RPC_AUTH_UNIX, "sys" }, 498 { RPC_AUTH_GSS_KRB5, "krb5" }, 499 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 500 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 501 { RPC_AUTH_GSS_LKEY, "lkey" }, 502 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 503 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 504 { RPC_AUTH_GSS_SPKM, "spkm" }, 505 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 506 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 507 { UINT_MAX, "unknown" } 508 }; 509 int i; 510 511 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 512 if (sec_flavours[i].flavour == flavour) 513 break; 514 } 515 return sec_flavours[i].str; 516 } 517 518 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 519 int showdefaults) 520 { 521 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 522 523 seq_printf(m, ",mountproto="); 524 switch (sap->sa_family) { 525 case AF_INET: 526 switch (nfss->mountd_protocol) { 527 case IPPROTO_UDP: 528 seq_printf(m, RPCBIND_NETID_UDP); 529 break; 530 case IPPROTO_TCP: 531 seq_printf(m, RPCBIND_NETID_TCP); 532 break; 533 default: 534 if (showdefaults) 535 seq_printf(m, "auto"); 536 } 537 break; 538 case AF_INET6: 539 switch (nfss->mountd_protocol) { 540 case IPPROTO_UDP: 541 seq_printf(m, RPCBIND_NETID_UDP6); 542 break; 543 case IPPROTO_TCP: 544 seq_printf(m, RPCBIND_NETID_TCP6); 545 break; 546 default: 547 if (showdefaults) 548 seq_printf(m, "auto"); 549 } 550 break; 551 default: 552 if (showdefaults) 553 seq_printf(m, "auto"); 554 } 555 } 556 557 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 558 int showdefaults) 559 { 560 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 561 562 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 563 return; 564 565 switch (sap->sa_family) { 566 case AF_INET: { 567 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 568 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 569 break; 570 } 571 case AF_INET6: { 572 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 573 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 574 break; 575 } 576 default: 577 if (showdefaults) 578 seq_printf(m, ",mountaddr=unspecified"); 579 } 580 581 if (nfss->mountd_version || showdefaults) 582 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 583 if ((nfss->mountd_port && 584 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 585 showdefaults) 586 seq_printf(m, ",mountport=%u", nfss->mountd_port); 587 588 nfs_show_mountd_netid(m, nfss, showdefaults); 589 } 590 591 #if IS_ENABLED(CONFIG_NFS_V4) 592 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 593 int showdefaults) 594 { 595 struct nfs_client *clp = nfss->nfs_client; 596 597 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 598 } 599 #else 600 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 601 int showdefaults) 602 { 603 } 604 #endif 605 606 static void nfs_show_nfs_version(struct seq_file *m, 607 unsigned int version, 608 unsigned int minorversion) 609 { 610 seq_printf(m, ",vers=%u", version); 611 if (version == 4) 612 seq_printf(m, ".%u", minorversion); 613 } 614 615 /* 616 * Describe the mount options in force on this server representation 617 */ 618 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 619 int showdefaults) 620 { 621 static const struct proc_nfs_info { 622 int flag; 623 const char *str; 624 const char *nostr; 625 } nfs_info[] = { 626 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 627 { NFS_MOUNT_POSIX, ",posix", "" }, 628 { NFS_MOUNT_NOCTO, ",nocto", "" }, 629 { NFS_MOUNT_NOAC, ",noac", "" }, 630 { NFS_MOUNT_NONLM, ",nolock", "" }, 631 { NFS_MOUNT_NOACL, ",noacl", "" }, 632 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 633 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 634 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 635 { 0, NULL, NULL } 636 }; 637 const struct proc_nfs_info *nfs_infop; 638 struct nfs_client *clp = nfss->nfs_client; 639 u32 version = clp->rpc_ops->version; 640 int local_flock, local_fcntl; 641 642 nfs_show_nfs_version(m, version, clp->cl_minorversion); 643 seq_printf(m, ",rsize=%u", nfss->rsize); 644 seq_printf(m, ",wsize=%u", nfss->wsize); 645 if (nfss->bsize != 0) 646 seq_printf(m, ",bsize=%u", nfss->bsize); 647 seq_printf(m, ",namlen=%u", nfss->namelen); 648 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 649 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 650 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 651 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 652 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 653 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 654 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 655 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 656 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 657 if (nfss->flags & nfs_infop->flag) 658 seq_puts(m, nfs_infop->str); 659 else 660 seq_puts(m, nfs_infop->nostr); 661 } 662 rcu_read_lock(); 663 seq_printf(m, ",proto=%s", 664 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 665 rcu_read_unlock(); 666 if (version == 4) { 667 if (nfss->port != NFS_PORT) 668 seq_printf(m, ",port=%u", nfss->port); 669 } else 670 if (nfss->port) 671 seq_printf(m, ",port=%u", nfss->port); 672 673 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 674 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 675 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 676 677 if (version != 4) 678 nfs_show_mountd_options(m, nfss, showdefaults); 679 else 680 nfs_show_nfsv4_options(m, nfss, showdefaults); 681 682 if (nfss->options & NFS_OPTION_FSCACHE) 683 seq_printf(m, ",fsc"); 684 685 if (nfss->options & NFS_OPTION_MIGRATION) 686 seq_printf(m, ",migration"); 687 688 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 689 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 690 seq_printf(m, ",lookupcache=none"); 691 else 692 seq_printf(m, ",lookupcache=pos"); 693 } 694 695 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 696 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 697 698 if (!local_flock && !local_fcntl) 699 seq_printf(m, ",local_lock=none"); 700 else if (local_flock && local_fcntl) 701 seq_printf(m, ",local_lock=all"); 702 else if (local_flock) 703 seq_printf(m, ",local_lock=flock"); 704 else 705 seq_printf(m, ",local_lock=posix"); 706 } 707 708 /* 709 * Describe the mount options on this VFS mountpoint 710 */ 711 int nfs_show_options(struct seq_file *m, struct dentry *root) 712 { 713 struct nfs_server *nfss = NFS_SB(root->d_sb); 714 715 nfs_show_mount_options(m, nfss, 0); 716 717 rcu_read_lock(); 718 seq_printf(m, ",addr=%s", 719 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 720 RPC_DISPLAY_ADDR)); 721 rcu_read_unlock(); 722 723 return 0; 724 } 725 EXPORT_SYMBOL_GPL(nfs_show_options); 726 727 #if IS_ENABLED(CONFIG_NFS_V4) 728 #ifdef CONFIG_NFS_V4_1 729 static void show_sessions(struct seq_file *m, struct nfs_server *server) 730 { 731 if (nfs4_has_session(server->nfs_client)) 732 seq_printf(m, ",sessions"); 733 } 734 #else 735 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 736 #endif 737 #endif 738 739 #ifdef CONFIG_NFS_V4_1 740 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 741 { 742 seq_printf(m, ",pnfs="); 743 if (server->pnfs_curr_ld) 744 seq_printf(m, "%s", server->pnfs_curr_ld->name); 745 else 746 seq_printf(m, "not configured"); 747 } 748 749 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 750 { 751 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 752 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 753 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 754 "date='%llu,%u'", 755 impl_id->name, impl_id->domain, 756 impl_id->date.seconds, impl_id->date.nseconds); 757 } 758 } 759 #else 760 #if IS_ENABLED(CONFIG_NFS_V4) 761 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 762 { 763 } 764 #endif 765 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 766 { 767 } 768 #endif 769 770 int nfs_show_devname(struct seq_file *m, struct dentry *root) 771 { 772 char *page = (char *) __get_free_page(GFP_KERNEL); 773 char *devname, *dummy; 774 int err = 0; 775 if (!page) 776 return -ENOMEM; 777 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 778 if (IS_ERR(devname)) 779 err = PTR_ERR(devname); 780 else 781 seq_escape(m, devname, " \t\n\\"); 782 free_page((unsigned long)page); 783 return err; 784 } 785 EXPORT_SYMBOL_GPL(nfs_show_devname); 786 787 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 788 { 789 seq_puts(m, "/"); 790 return 0; 791 } 792 EXPORT_SYMBOL_GPL(nfs_show_path); 793 794 /* 795 * Present statistical information for this VFS mountpoint 796 */ 797 int nfs_show_stats(struct seq_file *m, struct dentry *root) 798 { 799 int i, cpu; 800 struct nfs_server *nfss = NFS_SB(root->d_sb); 801 struct rpc_auth *auth = nfss->client->cl_auth; 802 struct nfs_iostats totals = { }; 803 804 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 805 806 /* 807 * Display all mount option settings 808 */ 809 seq_printf(m, "\n\topts:\t"); 810 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 811 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 812 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 813 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 814 nfs_show_mount_options(m, nfss, 1); 815 816 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 817 818 show_implementation_id(m, nfss); 819 820 seq_printf(m, "\n\tcaps:\t"); 821 seq_printf(m, "caps=0x%x", nfss->caps); 822 seq_printf(m, ",wtmult=%u", nfss->wtmult); 823 seq_printf(m, ",dtsize=%u", nfss->dtsize); 824 seq_printf(m, ",bsize=%u", nfss->bsize); 825 seq_printf(m, ",namlen=%u", nfss->namelen); 826 827 #if IS_ENABLED(CONFIG_NFS_V4) 828 if (nfss->nfs_client->rpc_ops->version == 4) { 829 seq_printf(m, "\n\tnfsv4:\t"); 830 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 831 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 832 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 833 show_sessions(m, nfss); 834 show_pnfs(m, nfss); 835 } 836 #endif 837 838 /* 839 * Display security flavor in effect for this mount 840 */ 841 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 842 if (auth->au_flavor) 843 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 844 845 /* 846 * Display superblock I/O counters 847 */ 848 for_each_possible_cpu(cpu) { 849 struct nfs_iostats *stats; 850 851 preempt_disable(); 852 stats = per_cpu_ptr(nfss->io_stats, cpu); 853 854 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 855 totals.events[i] += stats->events[i]; 856 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 857 totals.bytes[i] += stats->bytes[i]; 858 #ifdef CONFIG_NFS_FSCACHE 859 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 860 totals.fscache[i] += stats->fscache[i]; 861 #endif 862 863 preempt_enable(); 864 } 865 866 seq_printf(m, "\n\tevents:\t"); 867 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 868 seq_printf(m, "%lu ", totals.events[i]); 869 seq_printf(m, "\n\tbytes:\t"); 870 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 871 seq_printf(m, "%Lu ", totals.bytes[i]); 872 #ifdef CONFIG_NFS_FSCACHE 873 if (nfss->options & NFS_OPTION_FSCACHE) { 874 seq_printf(m, "\n\tfsc:\t"); 875 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 876 seq_printf(m, "%Lu ", totals.bytes[i]); 877 } 878 #endif 879 seq_printf(m, "\n"); 880 881 rpc_print_iostats(m, nfss->client); 882 883 return 0; 884 } 885 EXPORT_SYMBOL_GPL(nfs_show_stats); 886 887 /* 888 * Begin unmount by attempting to remove all automounted mountpoints we added 889 * in response to xdev traversals and referrals 890 */ 891 void nfs_umount_begin(struct super_block *sb) 892 { 893 struct nfs_server *server; 894 struct rpc_clnt *rpc; 895 896 server = NFS_SB(sb); 897 /* -EIO all pending I/O */ 898 rpc = server->client_acl; 899 if (!IS_ERR(rpc)) 900 rpc_killall_tasks(rpc); 901 rpc = server->client; 902 if (!IS_ERR(rpc)) 903 rpc_killall_tasks(rpc); 904 } 905 EXPORT_SYMBOL_GPL(nfs_umount_begin); 906 907 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 908 { 909 struct nfs_parsed_mount_data *data; 910 911 data = kzalloc(sizeof(*data), GFP_KERNEL); 912 if (data) { 913 data->acregmin = NFS_DEF_ACREGMIN; 914 data->acregmax = NFS_DEF_ACREGMAX; 915 data->acdirmin = NFS_DEF_ACDIRMIN; 916 data->acdirmax = NFS_DEF_ACDIRMAX; 917 data->mount_server.port = NFS_UNSPEC_PORT; 918 data->nfs_server.port = NFS_UNSPEC_PORT; 919 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 920 data->auth_flavors[0] = RPC_AUTH_UNIX; 921 data->auth_flavor_len = 1; 922 data->minorversion = 0; 923 data->need_mount = true; 924 data->net = current->nsproxy->net_ns; 925 security_init_mnt_opts(&data->lsm_opts); 926 } 927 return data; 928 } 929 930 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 931 { 932 if (data) { 933 kfree(data->client_address); 934 kfree(data->mount_server.hostname); 935 kfree(data->nfs_server.export_path); 936 kfree(data->nfs_server.hostname); 937 kfree(data->fscache_uniq); 938 security_free_mnt_opts(&data->lsm_opts); 939 kfree(data); 940 } 941 } 942 943 /* 944 * Sanity-check a server address provided by the mount command. 945 * 946 * Address family must be initialized, and address must not be 947 * the ANY address for that family. 948 */ 949 static int nfs_verify_server_address(struct sockaddr *addr) 950 { 951 switch (addr->sa_family) { 952 case AF_INET: { 953 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 954 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 955 } 956 case AF_INET6: { 957 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 958 return !ipv6_addr_any(sa); 959 } 960 } 961 962 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 963 return 0; 964 } 965 966 /* 967 * Select between a default port value and a user-specified port value. 968 * If a zero value is set, then autobind will be used. 969 */ 970 static void nfs_set_port(struct sockaddr *sap, int *port, 971 const unsigned short default_port) 972 { 973 if (*port == NFS_UNSPEC_PORT) 974 *port = default_port; 975 976 rpc_set_port(sap, *port); 977 } 978 979 /* 980 * Sanity check the NFS transport protocol. 981 * 982 */ 983 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 984 { 985 switch (mnt->nfs_server.protocol) { 986 case XPRT_TRANSPORT_UDP: 987 case XPRT_TRANSPORT_TCP: 988 case XPRT_TRANSPORT_RDMA: 989 break; 990 default: 991 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 992 } 993 } 994 995 /* 996 * For text based NFSv2/v3 mounts, the mount protocol transport default 997 * settings should depend upon the specified NFS transport. 998 */ 999 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1000 { 1001 nfs_validate_transport_protocol(mnt); 1002 1003 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1004 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1005 return; 1006 switch (mnt->nfs_server.protocol) { 1007 case XPRT_TRANSPORT_UDP: 1008 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1009 break; 1010 case XPRT_TRANSPORT_TCP: 1011 case XPRT_TRANSPORT_RDMA: 1012 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1013 } 1014 } 1015 1016 /* 1017 * Parse the value of the 'sec=' option. 1018 */ 1019 static int nfs_parse_security_flavors(char *value, 1020 struct nfs_parsed_mount_data *mnt) 1021 { 1022 substring_t args[MAX_OPT_ARGS]; 1023 1024 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1025 1026 switch (match_token(value, nfs_secflavor_tokens, args)) { 1027 case Opt_sec_none: 1028 mnt->auth_flavors[0] = RPC_AUTH_NULL; 1029 break; 1030 case Opt_sec_sys: 1031 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 1032 break; 1033 case Opt_sec_krb5: 1034 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 1035 break; 1036 case Opt_sec_krb5i: 1037 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 1038 break; 1039 case Opt_sec_krb5p: 1040 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 1041 break; 1042 case Opt_sec_lkey: 1043 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 1044 break; 1045 case Opt_sec_lkeyi: 1046 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 1047 break; 1048 case Opt_sec_lkeyp: 1049 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 1050 break; 1051 case Opt_sec_spkm: 1052 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 1053 break; 1054 case Opt_sec_spkmi: 1055 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 1056 break; 1057 case Opt_sec_spkmp: 1058 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 1059 break; 1060 default: 1061 return 0; 1062 } 1063 1064 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 1065 mnt->auth_flavor_len = 1; 1066 return 1; 1067 } 1068 1069 static int nfs_parse_version_string(char *string, 1070 struct nfs_parsed_mount_data *mnt, 1071 substring_t *args) 1072 { 1073 mnt->flags &= ~NFS_MOUNT_VER3; 1074 switch (match_token(string, nfs_vers_tokens, args)) { 1075 case Opt_vers_2: 1076 mnt->version = 2; 1077 break; 1078 case Opt_vers_3: 1079 mnt->flags |= NFS_MOUNT_VER3; 1080 mnt->version = 3; 1081 break; 1082 case Opt_vers_4: 1083 /* Backward compatibility option. In future, 1084 * the mount program should always supply 1085 * a NFSv4 minor version number. 1086 */ 1087 mnt->version = 4; 1088 break; 1089 case Opt_vers_4_0: 1090 mnt->version = 4; 1091 mnt->minorversion = 0; 1092 break; 1093 case Opt_vers_4_1: 1094 mnt->version = 4; 1095 mnt->minorversion = 1; 1096 break; 1097 default: 1098 return 0; 1099 } 1100 return 1; 1101 } 1102 1103 static int nfs_get_option_str(substring_t args[], char **option) 1104 { 1105 kfree(*option); 1106 *option = match_strdup(args); 1107 return !*option; 1108 } 1109 1110 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1111 { 1112 int rc; 1113 char *string; 1114 1115 string = match_strdup(args); 1116 if (string == NULL) 1117 return -ENOMEM; 1118 rc = kstrtoul(string, 10, option); 1119 kfree(string); 1120 1121 return rc; 1122 } 1123 1124 /* 1125 * Error-check and convert a string of mount options from user space into 1126 * a data structure. The whole mount string is processed; bad options are 1127 * skipped as they are encountered. If there were no errors, return 1; 1128 * otherwise return 0 (zero). 1129 */ 1130 static int nfs_parse_mount_options(char *raw, 1131 struct nfs_parsed_mount_data *mnt) 1132 { 1133 char *p, *string, *secdata; 1134 int rc, sloppy = 0, invalid_option = 0; 1135 unsigned short protofamily = AF_UNSPEC; 1136 unsigned short mountfamily = AF_UNSPEC; 1137 1138 if (!raw) { 1139 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1140 return 1; 1141 } 1142 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1143 1144 secdata = alloc_secdata(); 1145 if (!secdata) 1146 goto out_nomem; 1147 1148 rc = security_sb_copy_data(raw, secdata); 1149 if (rc) 1150 goto out_security_failure; 1151 1152 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1153 if (rc) 1154 goto out_security_failure; 1155 1156 free_secdata(secdata); 1157 1158 while ((p = strsep(&raw, ",")) != NULL) { 1159 substring_t args[MAX_OPT_ARGS]; 1160 unsigned long option; 1161 int token; 1162 1163 if (!*p) 1164 continue; 1165 1166 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1167 1168 token = match_token(p, nfs_mount_option_tokens, args); 1169 switch (token) { 1170 1171 /* 1172 * boolean options: foo/nofoo 1173 */ 1174 case Opt_soft: 1175 mnt->flags |= NFS_MOUNT_SOFT; 1176 break; 1177 case Opt_hard: 1178 mnt->flags &= ~NFS_MOUNT_SOFT; 1179 break; 1180 case Opt_posix: 1181 mnt->flags |= NFS_MOUNT_POSIX; 1182 break; 1183 case Opt_noposix: 1184 mnt->flags &= ~NFS_MOUNT_POSIX; 1185 break; 1186 case Opt_cto: 1187 mnt->flags &= ~NFS_MOUNT_NOCTO; 1188 break; 1189 case Opt_nocto: 1190 mnt->flags |= NFS_MOUNT_NOCTO; 1191 break; 1192 case Opt_ac: 1193 mnt->flags &= ~NFS_MOUNT_NOAC; 1194 break; 1195 case Opt_noac: 1196 mnt->flags |= NFS_MOUNT_NOAC; 1197 break; 1198 case Opt_lock: 1199 mnt->flags &= ~NFS_MOUNT_NONLM; 1200 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1201 NFS_MOUNT_LOCAL_FCNTL); 1202 break; 1203 case Opt_nolock: 1204 mnt->flags |= NFS_MOUNT_NONLM; 1205 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1206 NFS_MOUNT_LOCAL_FCNTL); 1207 break; 1208 case Opt_udp: 1209 mnt->flags &= ~NFS_MOUNT_TCP; 1210 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1211 break; 1212 case Opt_tcp: 1213 mnt->flags |= NFS_MOUNT_TCP; 1214 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1215 break; 1216 case Opt_rdma: 1217 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1218 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1219 xprt_load_transport(p); 1220 break; 1221 case Opt_acl: 1222 mnt->flags &= ~NFS_MOUNT_NOACL; 1223 break; 1224 case Opt_noacl: 1225 mnt->flags |= NFS_MOUNT_NOACL; 1226 break; 1227 case Opt_rdirplus: 1228 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1229 break; 1230 case Opt_nordirplus: 1231 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1232 break; 1233 case Opt_sharecache: 1234 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1235 break; 1236 case Opt_nosharecache: 1237 mnt->flags |= NFS_MOUNT_UNSHARED; 1238 break; 1239 case Opt_resvport: 1240 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1241 break; 1242 case Opt_noresvport: 1243 mnt->flags |= NFS_MOUNT_NORESVPORT; 1244 break; 1245 case Opt_fscache: 1246 mnt->options |= NFS_OPTION_FSCACHE; 1247 kfree(mnt->fscache_uniq); 1248 mnt->fscache_uniq = NULL; 1249 break; 1250 case Opt_nofscache: 1251 mnt->options &= ~NFS_OPTION_FSCACHE; 1252 kfree(mnt->fscache_uniq); 1253 mnt->fscache_uniq = NULL; 1254 break; 1255 case Opt_migration: 1256 mnt->options |= NFS_OPTION_MIGRATION; 1257 break; 1258 case Opt_nomigration: 1259 mnt->options &= NFS_OPTION_MIGRATION; 1260 break; 1261 1262 /* 1263 * options that take numeric values 1264 */ 1265 case Opt_port: 1266 if (nfs_get_option_ul(args, &option) || 1267 option > USHRT_MAX) 1268 goto out_invalid_value; 1269 mnt->nfs_server.port = option; 1270 break; 1271 case Opt_rsize: 1272 if (nfs_get_option_ul(args, &option)) 1273 goto out_invalid_value; 1274 mnt->rsize = option; 1275 break; 1276 case Opt_wsize: 1277 if (nfs_get_option_ul(args, &option)) 1278 goto out_invalid_value; 1279 mnt->wsize = option; 1280 break; 1281 case Opt_bsize: 1282 if (nfs_get_option_ul(args, &option)) 1283 goto out_invalid_value; 1284 mnt->bsize = option; 1285 break; 1286 case Opt_timeo: 1287 if (nfs_get_option_ul(args, &option) || option == 0) 1288 goto out_invalid_value; 1289 mnt->timeo = option; 1290 break; 1291 case Opt_retrans: 1292 if (nfs_get_option_ul(args, &option) || option == 0) 1293 goto out_invalid_value; 1294 mnt->retrans = option; 1295 break; 1296 case Opt_acregmin: 1297 if (nfs_get_option_ul(args, &option)) 1298 goto out_invalid_value; 1299 mnt->acregmin = option; 1300 break; 1301 case Opt_acregmax: 1302 if (nfs_get_option_ul(args, &option)) 1303 goto out_invalid_value; 1304 mnt->acregmax = option; 1305 break; 1306 case Opt_acdirmin: 1307 if (nfs_get_option_ul(args, &option)) 1308 goto out_invalid_value; 1309 mnt->acdirmin = option; 1310 break; 1311 case Opt_acdirmax: 1312 if (nfs_get_option_ul(args, &option)) 1313 goto out_invalid_value; 1314 mnt->acdirmax = option; 1315 break; 1316 case Opt_actimeo: 1317 if (nfs_get_option_ul(args, &option)) 1318 goto out_invalid_value; 1319 mnt->acregmin = mnt->acregmax = 1320 mnt->acdirmin = mnt->acdirmax = option; 1321 break; 1322 case Opt_namelen: 1323 if (nfs_get_option_ul(args, &option)) 1324 goto out_invalid_value; 1325 mnt->namlen = option; 1326 break; 1327 case Opt_mountport: 1328 if (nfs_get_option_ul(args, &option) || 1329 option > USHRT_MAX) 1330 goto out_invalid_value; 1331 mnt->mount_server.port = option; 1332 break; 1333 case Opt_mountvers: 1334 if (nfs_get_option_ul(args, &option) || 1335 option < NFS_MNT_VERSION || 1336 option > NFS_MNT3_VERSION) 1337 goto out_invalid_value; 1338 mnt->mount_server.version = option; 1339 break; 1340 case Opt_minorversion: 1341 if (nfs_get_option_ul(args, &option)) 1342 goto out_invalid_value; 1343 if (option > NFS4_MAX_MINOR_VERSION) 1344 goto out_invalid_value; 1345 mnt->minorversion = option; 1346 break; 1347 1348 /* 1349 * options that take text values 1350 */ 1351 case Opt_nfsvers: 1352 string = match_strdup(args); 1353 if (string == NULL) 1354 goto out_nomem; 1355 rc = nfs_parse_version_string(string, mnt, args); 1356 kfree(string); 1357 if (!rc) 1358 goto out_invalid_value; 1359 break; 1360 case Opt_sec: 1361 string = match_strdup(args); 1362 if (string == NULL) 1363 goto out_nomem; 1364 rc = nfs_parse_security_flavors(string, mnt); 1365 kfree(string); 1366 if (!rc) { 1367 dfprintk(MOUNT, "NFS: unrecognized " 1368 "security flavor\n"); 1369 return 0; 1370 } 1371 break; 1372 case Opt_proto: 1373 string = match_strdup(args); 1374 if (string == NULL) 1375 goto out_nomem; 1376 token = match_token(string, 1377 nfs_xprt_protocol_tokens, args); 1378 1379 protofamily = AF_INET; 1380 switch (token) { 1381 case Opt_xprt_udp6: 1382 protofamily = AF_INET6; 1383 case Opt_xprt_udp: 1384 mnt->flags &= ~NFS_MOUNT_TCP; 1385 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1386 break; 1387 case Opt_xprt_tcp6: 1388 protofamily = AF_INET6; 1389 case Opt_xprt_tcp: 1390 mnt->flags |= NFS_MOUNT_TCP; 1391 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1392 break; 1393 case Opt_xprt_rdma: 1394 /* vector side protocols to TCP */ 1395 mnt->flags |= NFS_MOUNT_TCP; 1396 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1397 xprt_load_transport(string); 1398 break; 1399 default: 1400 dfprintk(MOUNT, "NFS: unrecognized " 1401 "transport protocol\n"); 1402 kfree(string); 1403 return 0; 1404 } 1405 kfree(string); 1406 break; 1407 case Opt_mountproto: 1408 string = match_strdup(args); 1409 if (string == NULL) 1410 goto out_nomem; 1411 token = match_token(string, 1412 nfs_xprt_protocol_tokens, args); 1413 kfree(string); 1414 1415 mountfamily = AF_INET; 1416 switch (token) { 1417 case Opt_xprt_udp6: 1418 mountfamily = AF_INET6; 1419 case Opt_xprt_udp: 1420 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1421 break; 1422 case Opt_xprt_tcp6: 1423 mountfamily = AF_INET6; 1424 case Opt_xprt_tcp: 1425 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1426 break; 1427 case Opt_xprt_rdma: /* not used for side protocols */ 1428 default: 1429 dfprintk(MOUNT, "NFS: unrecognized " 1430 "transport protocol\n"); 1431 return 0; 1432 } 1433 break; 1434 case Opt_addr: 1435 string = match_strdup(args); 1436 if (string == NULL) 1437 goto out_nomem; 1438 mnt->nfs_server.addrlen = 1439 rpc_pton(mnt->net, string, strlen(string), 1440 (struct sockaddr *) 1441 &mnt->nfs_server.address, 1442 sizeof(mnt->nfs_server.address)); 1443 kfree(string); 1444 if (mnt->nfs_server.addrlen == 0) 1445 goto out_invalid_address; 1446 break; 1447 case Opt_clientaddr: 1448 if (nfs_get_option_str(args, &mnt->client_address)) 1449 goto out_nomem; 1450 break; 1451 case Opt_mounthost: 1452 if (nfs_get_option_str(args, 1453 &mnt->mount_server.hostname)) 1454 goto out_nomem; 1455 break; 1456 case Opt_mountaddr: 1457 string = match_strdup(args); 1458 if (string == NULL) 1459 goto out_nomem; 1460 mnt->mount_server.addrlen = 1461 rpc_pton(mnt->net, string, strlen(string), 1462 (struct sockaddr *) 1463 &mnt->mount_server.address, 1464 sizeof(mnt->mount_server.address)); 1465 kfree(string); 1466 if (mnt->mount_server.addrlen == 0) 1467 goto out_invalid_address; 1468 break; 1469 case Opt_lookupcache: 1470 string = match_strdup(args); 1471 if (string == NULL) 1472 goto out_nomem; 1473 token = match_token(string, 1474 nfs_lookupcache_tokens, args); 1475 kfree(string); 1476 switch (token) { 1477 case Opt_lookupcache_all: 1478 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1479 break; 1480 case Opt_lookupcache_positive: 1481 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1482 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1483 break; 1484 case Opt_lookupcache_none: 1485 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1486 break; 1487 default: 1488 dfprintk(MOUNT, "NFS: invalid " 1489 "lookupcache argument\n"); 1490 return 0; 1491 }; 1492 break; 1493 case Opt_fscache_uniq: 1494 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1495 goto out_nomem; 1496 mnt->options |= NFS_OPTION_FSCACHE; 1497 break; 1498 case Opt_local_lock: 1499 string = match_strdup(args); 1500 if (string == NULL) 1501 goto out_nomem; 1502 token = match_token(string, nfs_local_lock_tokens, 1503 args); 1504 kfree(string); 1505 switch (token) { 1506 case Opt_local_lock_all: 1507 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1508 NFS_MOUNT_LOCAL_FCNTL); 1509 break; 1510 case Opt_local_lock_flock: 1511 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1512 break; 1513 case Opt_local_lock_posix: 1514 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1515 break; 1516 case Opt_local_lock_none: 1517 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1518 NFS_MOUNT_LOCAL_FCNTL); 1519 break; 1520 default: 1521 dfprintk(MOUNT, "NFS: invalid " 1522 "local_lock argument\n"); 1523 return 0; 1524 }; 1525 break; 1526 1527 /* 1528 * Special options 1529 */ 1530 case Opt_sloppy: 1531 sloppy = 1; 1532 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1533 break; 1534 case Opt_userspace: 1535 case Opt_deprecated: 1536 dfprintk(MOUNT, "NFS: ignoring mount option " 1537 "'%s'\n", p); 1538 break; 1539 1540 default: 1541 invalid_option = 1; 1542 dfprintk(MOUNT, "NFS: unrecognized mount option " 1543 "'%s'\n", p); 1544 } 1545 } 1546 1547 if (!sloppy && invalid_option) 1548 return 0; 1549 1550 if (mnt->minorversion && mnt->version != 4) 1551 goto out_minorversion_mismatch; 1552 1553 if (mnt->options & NFS_OPTION_MIGRATION && 1554 mnt->version != 4 && mnt->minorversion != 0) 1555 goto out_migration_misuse; 1556 1557 /* 1558 * verify that any proto=/mountproto= options match the address 1559 * families in the addr=/mountaddr= options. 1560 */ 1561 if (protofamily != AF_UNSPEC && 1562 protofamily != mnt->nfs_server.address.ss_family) 1563 goto out_proto_mismatch; 1564 1565 if (mountfamily != AF_UNSPEC) { 1566 if (mnt->mount_server.addrlen) { 1567 if (mountfamily != mnt->mount_server.address.ss_family) 1568 goto out_mountproto_mismatch; 1569 } else { 1570 if (mountfamily != mnt->nfs_server.address.ss_family) 1571 goto out_mountproto_mismatch; 1572 } 1573 } 1574 1575 return 1; 1576 1577 out_mountproto_mismatch: 1578 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1579 "option\n"); 1580 return 0; 1581 out_proto_mismatch: 1582 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1583 return 0; 1584 out_invalid_address: 1585 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1586 return 0; 1587 out_invalid_value: 1588 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1589 return 0; 1590 out_minorversion_mismatch: 1591 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1592 "minorversion=%u\n", mnt->version, mnt->minorversion); 1593 return 0; 1594 out_migration_misuse: 1595 printk(KERN_INFO 1596 "NFS: 'migration' not supported for this NFS version\n"); 1597 return 0; 1598 out_nomem: 1599 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1600 return 0; 1601 out_security_failure: 1602 free_secdata(secdata); 1603 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1604 return 0; 1605 } 1606 1607 /* 1608 * Match the requested auth flavors with the list returned by 1609 * the server. Returns zero and sets the mount's authentication 1610 * flavor on success; returns -EACCES if server does not support 1611 * the requested flavor. 1612 */ 1613 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1614 struct nfs_mount_request *request) 1615 { 1616 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1617 1618 /* 1619 * Certain releases of Linux's mountd return an empty 1620 * flavor list. To prevent behavioral regression with 1621 * these servers (ie. rejecting mounts that used to 1622 * succeed), revert to pre-2.6.32 behavior (no checking) 1623 * if the returned flavor list is empty. 1624 */ 1625 if (server_authlist_len == 0) 1626 return 0; 1627 1628 /* 1629 * We avoid sophisticated negotiating here, as there are 1630 * plenty of cases where we can get it wrong, providing 1631 * either too little or too much security. 1632 * 1633 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1634 * flavor listed first. However, some servers list 1635 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1636 * preferred default, in args->auth_flavors[0] if user 1637 * didn't specify sec= mount option. 1638 */ 1639 for (i = 0; i < args->auth_flavor_len; i++) 1640 for (j = 0; j < server_authlist_len; j++) 1641 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1642 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1643 request->auth_flavs[j]); 1644 args->auth_flavors[0] = request->auth_flavs[j]; 1645 return 0; 1646 } 1647 1648 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1649 nfs_umount(request); 1650 return -EACCES; 1651 } 1652 1653 /* 1654 * Use the remote server's MOUNT service to request the NFS file handle 1655 * corresponding to the provided path. 1656 */ 1657 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1658 struct nfs_fh *root_fh) 1659 { 1660 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1661 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1662 struct nfs_mount_request request = { 1663 .sap = (struct sockaddr *) 1664 &args->mount_server.address, 1665 .dirpath = args->nfs_server.export_path, 1666 .protocol = args->mount_server.protocol, 1667 .fh = root_fh, 1668 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1669 .auth_flav_len = &server_authlist_len, 1670 .auth_flavs = server_authlist, 1671 .net = args->net, 1672 }; 1673 int status; 1674 1675 if (args->mount_server.version == 0) { 1676 switch (args->version) { 1677 default: 1678 args->mount_server.version = NFS_MNT3_VERSION; 1679 break; 1680 case 2: 1681 args->mount_server.version = NFS_MNT_VERSION; 1682 } 1683 } 1684 request.version = args->mount_server.version; 1685 1686 if (args->mount_server.hostname) 1687 request.hostname = args->mount_server.hostname; 1688 else 1689 request.hostname = args->nfs_server.hostname; 1690 1691 /* 1692 * Construct the mount server's address. 1693 */ 1694 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1695 memcpy(request.sap, &args->nfs_server.address, 1696 args->nfs_server.addrlen); 1697 args->mount_server.addrlen = args->nfs_server.addrlen; 1698 } 1699 request.salen = args->mount_server.addrlen; 1700 nfs_set_port(request.sap, &args->mount_server.port, 0); 1701 1702 /* 1703 * Now ask the mount server to map our export path 1704 * to a file handle. 1705 */ 1706 status = nfs_mount(&request); 1707 if (status != 0) { 1708 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1709 request.hostname, status); 1710 return status; 1711 } 1712 1713 /* 1714 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1715 */ 1716 if (args->mount_server.version != NFS_MNT3_VERSION) 1717 return 0; 1718 return nfs_walk_authlist(args, &request); 1719 } 1720 1721 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1722 struct nfs_mount_info *mount_info, 1723 struct nfs_subversion *nfs_mod) 1724 { 1725 int status; 1726 struct nfs_server *server; 1727 1728 if (mount_info->parsed->need_mount) { 1729 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh); 1730 if (status) 1731 return ERR_PTR(status); 1732 } 1733 1734 /* Get a volume representation */ 1735 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1736 if (IS_ERR(server)) 1737 return ERR_CAST(server); 1738 1739 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1740 } 1741 EXPORT_SYMBOL_GPL(nfs_try_mount); 1742 1743 /* 1744 * Split "dev_name" into "hostname:export_path". 1745 * 1746 * The leftmost colon demarks the split between the server's hostname 1747 * and the export path. If the hostname starts with a left square 1748 * bracket, then it may contain colons. 1749 * 1750 * Note: caller frees hostname and export path, even on error. 1751 */ 1752 static int nfs_parse_devname(const char *dev_name, 1753 char **hostname, size_t maxnamlen, 1754 char **export_path, size_t maxpathlen) 1755 { 1756 size_t len; 1757 char *end; 1758 1759 /* Is the host name protected with square brakcets? */ 1760 if (*dev_name == '[') { 1761 end = strchr(++dev_name, ']'); 1762 if (end == NULL || end[1] != ':') 1763 goto out_bad_devname; 1764 1765 len = end - dev_name; 1766 end++; 1767 } else { 1768 char *comma; 1769 1770 end = strchr(dev_name, ':'); 1771 if (end == NULL) 1772 goto out_bad_devname; 1773 len = end - dev_name; 1774 1775 /* kill possible hostname list: not supported */ 1776 comma = strchr(dev_name, ','); 1777 if (comma != NULL && comma < end) 1778 *comma = 0; 1779 } 1780 1781 if (len > maxnamlen) 1782 goto out_hostname; 1783 1784 /* N.B. caller will free nfs_server.hostname in all cases */ 1785 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1786 if (*hostname == NULL) 1787 goto out_nomem; 1788 len = strlen(++end); 1789 if (len > maxpathlen) 1790 goto out_path; 1791 *export_path = kstrndup(end, len, GFP_KERNEL); 1792 if (!*export_path) 1793 goto out_nomem; 1794 1795 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1796 return 0; 1797 1798 out_bad_devname: 1799 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1800 return -EINVAL; 1801 1802 out_nomem: 1803 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1804 return -ENOMEM; 1805 1806 out_hostname: 1807 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1808 return -ENAMETOOLONG; 1809 1810 out_path: 1811 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1812 return -ENAMETOOLONG; 1813 } 1814 1815 /* 1816 * Validate the NFS2/NFS3 mount data 1817 * - fills in the mount root filehandle 1818 * 1819 * For option strings, user space handles the following behaviors: 1820 * 1821 * + DNS: mapping server host name to IP address ("addr=" option) 1822 * 1823 * + failure mode: how to behave if a mount request can't be handled 1824 * immediately ("fg/bg" option) 1825 * 1826 * + retry: how often to retry a mount request ("retry=" option) 1827 * 1828 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1829 * mountproto=tcp after mountproto=udp, and so on 1830 */ 1831 static int nfs23_validate_mount_data(void *options, 1832 struct nfs_parsed_mount_data *args, 1833 struct nfs_fh *mntfh, 1834 const char *dev_name) 1835 { 1836 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1837 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1838 1839 if (data == NULL) 1840 goto out_no_data; 1841 1842 args->version = NFS_DEFAULT_VERSION; 1843 switch (data->version) { 1844 case 1: 1845 data->namlen = 0; 1846 case 2: 1847 data->bsize = 0; 1848 case 3: 1849 if (data->flags & NFS_MOUNT_VER3) 1850 goto out_no_v3; 1851 data->root.size = NFS2_FHSIZE; 1852 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1853 case 4: 1854 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1855 goto out_no_sec; 1856 case 5: 1857 memset(data->context, 0, sizeof(data->context)); 1858 case 6: 1859 if (data->flags & NFS_MOUNT_VER3) { 1860 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1861 goto out_invalid_fh; 1862 mntfh->size = data->root.size; 1863 args->version = 3; 1864 } else { 1865 mntfh->size = NFS2_FHSIZE; 1866 args->version = 2; 1867 } 1868 1869 1870 memcpy(mntfh->data, data->root.data, mntfh->size); 1871 if (mntfh->size < sizeof(mntfh->data)) 1872 memset(mntfh->data + mntfh->size, 0, 1873 sizeof(mntfh->data) - mntfh->size); 1874 1875 /* 1876 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1877 * can deal with. 1878 */ 1879 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1880 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1881 args->rsize = data->rsize; 1882 args->wsize = data->wsize; 1883 args->timeo = data->timeo; 1884 args->retrans = data->retrans; 1885 args->acregmin = data->acregmin; 1886 args->acregmax = data->acregmax; 1887 args->acdirmin = data->acdirmin; 1888 args->acdirmax = data->acdirmax; 1889 args->need_mount = false; 1890 1891 memcpy(sap, &data->addr, sizeof(data->addr)); 1892 args->nfs_server.addrlen = sizeof(data->addr); 1893 args->nfs_server.port = ntohs(data->addr.sin_port); 1894 if (!nfs_verify_server_address(sap)) 1895 goto out_no_address; 1896 1897 if (!(data->flags & NFS_MOUNT_TCP)) 1898 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1899 /* N.B. caller will free nfs_server.hostname in all cases */ 1900 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1901 args->namlen = data->namlen; 1902 args->bsize = data->bsize; 1903 1904 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1905 args->auth_flavors[0] = data->pseudoflavor; 1906 if (!args->nfs_server.hostname) 1907 goto out_nomem; 1908 1909 if (!(data->flags & NFS_MOUNT_NONLM)) 1910 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1911 NFS_MOUNT_LOCAL_FCNTL); 1912 else 1913 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1914 NFS_MOUNT_LOCAL_FCNTL); 1915 /* 1916 * The legacy version 6 binary mount data from userspace has a 1917 * field used only to transport selinux information into the 1918 * the kernel. To continue to support that functionality we 1919 * have a touch of selinux knowledge here in the NFS code. The 1920 * userspace code converted context=blah to just blah so we are 1921 * converting back to the full string selinux understands. 1922 */ 1923 if (data->context[0]){ 1924 #ifdef CONFIG_SECURITY_SELINUX 1925 int rc; 1926 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1927 if (!opts_str) 1928 return -ENOMEM; 1929 strcpy(opts_str, "context="); 1930 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1931 strcat(opts_str, &data->context[0]); 1932 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1933 kfree(opts_str); 1934 if (rc) 1935 return rc; 1936 #else 1937 return -EINVAL; 1938 #endif 1939 } 1940 1941 break; 1942 default: 1943 return NFS_TEXT_DATA; 1944 } 1945 1946 #if !IS_ENABLED(CONFIG_NFS_V3) 1947 if (args->version == 3) 1948 goto out_v3_not_compiled; 1949 #endif /* !CONFIG_NFS_V3 */ 1950 1951 return 0; 1952 1953 out_no_data: 1954 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1955 return -EINVAL; 1956 1957 out_no_v3: 1958 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 1959 data->version); 1960 return -EINVAL; 1961 1962 out_no_sec: 1963 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 1964 return -EINVAL; 1965 1966 #if !IS_ENABLED(CONFIG_NFS_V3) 1967 out_v3_not_compiled: 1968 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 1969 return -EPROTONOSUPPORT; 1970 #endif /* !CONFIG_NFS_V3 */ 1971 1972 out_nomem: 1973 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 1974 return -ENOMEM; 1975 1976 out_no_address: 1977 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 1978 return -EINVAL; 1979 1980 out_invalid_fh: 1981 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 1982 return -EINVAL; 1983 } 1984 1985 #if IS_ENABLED(CONFIG_NFS_V4) 1986 static int nfs_validate_mount_data(struct file_system_type *fs_type, 1987 void *options, 1988 struct nfs_parsed_mount_data *args, 1989 struct nfs_fh *mntfh, 1990 const char *dev_name) 1991 { 1992 if (fs_type == &nfs_fs_type) 1993 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 1994 return nfs4_validate_mount_data(options, args, dev_name); 1995 } 1996 #else 1997 static int nfs_validate_mount_data(struct file_system_type *fs_type, 1998 void *options, 1999 struct nfs_parsed_mount_data *args, 2000 struct nfs_fh *mntfh, 2001 const char *dev_name) 2002 { 2003 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2004 } 2005 #endif 2006 2007 static int nfs_validate_text_mount_data(void *options, 2008 struct nfs_parsed_mount_data *args, 2009 const char *dev_name) 2010 { 2011 int port = 0; 2012 int max_namelen = PAGE_SIZE; 2013 int max_pathlen = NFS_MAXPATHLEN; 2014 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2015 2016 if (nfs_parse_mount_options((char *)options, args) == 0) 2017 return -EINVAL; 2018 2019 if (!nfs_verify_server_address(sap)) 2020 goto out_no_address; 2021 2022 if (args->version == 4) { 2023 #if IS_ENABLED(CONFIG_NFS_V4) 2024 port = NFS_PORT; 2025 max_namelen = NFS4_MAXNAMLEN; 2026 max_pathlen = NFS4_MAXPATHLEN; 2027 nfs_validate_transport_protocol(args); 2028 nfs4_validate_mount_flags(args); 2029 #else 2030 goto out_v4_not_compiled; 2031 #endif /* CONFIG_NFS_V4 */ 2032 } else 2033 nfs_set_mount_transport_protocol(args); 2034 2035 nfs_set_port(sap, &args->nfs_server.port, port); 2036 2037 if (args->auth_flavor_len > 1) 2038 goto out_bad_auth; 2039 2040 return nfs_parse_devname(dev_name, 2041 &args->nfs_server.hostname, 2042 max_namelen, 2043 &args->nfs_server.export_path, 2044 max_pathlen); 2045 2046 #if !IS_ENABLED(CONFIG_NFS_V4) 2047 out_v4_not_compiled: 2048 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2049 return -EPROTONOSUPPORT; 2050 #endif /* !CONFIG_NFS_V4 */ 2051 2052 out_no_address: 2053 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2054 return -EINVAL; 2055 2056 out_bad_auth: 2057 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n"); 2058 return -EINVAL; 2059 } 2060 2061 static int 2062 nfs_compare_remount_data(struct nfs_server *nfss, 2063 struct nfs_parsed_mount_data *data) 2064 { 2065 if (data->flags != nfss->flags || 2066 data->rsize != nfss->rsize || 2067 data->wsize != nfss->wsize || 2068 data->retrans != nfss->client->cl_timeout->to_retries || 2069 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2070 data->acregmin != nfss->acregmin / HZ || 2071 data->acregmax != nfss->acregmax / HZ || 2072 data->acdirmin != nfss->acdirmin / HZ || 2073 data->acdirmax != nfss->acdirmax / HZ || 2074 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2075 data->nfs_server.port != nfss->port || 2076 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2077 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2078 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2079 return -EINVAL; 2080 2081 return 0; 2082 } 2083 2084 int 2085 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2086 { 2087 int error; 2088 struct nfs_server *nfss = sb->s_fs_info; 2089 struct nfs_parsed_mount_data *data; 2090 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2091 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2092 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2093 2094 /* 2095 * Userspace mount programs that send binary options generally send 2096 * them populated with default values. We have no way to know which 2097 * ones were explicitly specified. Fall back to legacy behavior and 2098 * just return success. 2099 */ 2100 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2101 (nfsvers <= 3 && (!options || (options->version >= 1 && 2102 options->version <= 6)))) 2103 return 0; 2104 2105 data = kzalloc(sizeof(*data), GFP_KERNEL); 2106 if (data == NULL) 2107 return -ENOMEM; 2108 2109 /* fill out struct with values from existing mount */ 2110 data->flags = nfss->flags; 2111 data->rsize = nfss->rsize; 2112 data->wsize = nfss->wsize; 2113 data->retrans = nfss->client->cl_timeout->to_retries; 2114 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2115 data->acregmin = nfss->acregmin / HZ; 2116 data->acregmax = nfss->acregmax / HZ; 2117 data->acdirmin = nfss->acdirmin / HZ; 2118 data->acdirmax = nfss->acdirmax / HZ; 2119 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2120 data->nfs_server.port = nfss->port; 2121 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2122 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2123 data->nfs_server.addrlen); 2124 2125 /* overwrite those values with any that were specified */ 2126 error = nfs_parse_mount_options((char *)options, data); 2127 if (error < 0) 2128 goto out; 2129 2130 /* 2131 * noac is a special case. It implies -o sync, but that's not 2132 * necessarily reflected in the mtab options. do_remount_sb 2133 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2134 * remount options, so we have to explicitly reset it. 2135 */ 2136 if (data->flags & NFS_MOUNT_NOAC) 2137 *flags |= MS_SYNCHRONOUS; 2138 2139 /* compare new mount options with old ones */ 2140 error = nfs_compare_remount_data(nfss, data); 2141 out: 2142 kfree(data); 2143 return error; 2144 } 2145 EXPORT_SYMBOL_GPL(nfs_remount); 2146 2147 /* 2148 * Initialise the common bits of the superblock 2149 */ 2150 inline void nfs_initialise_sb(struct super_block *sb) 2151 { 2152 struct nfs_server *server = NFS_SB(sb); 2153 2154 sb->s_magic = NFS_SUPER_MAGIC; 2155 2156 /* We probably want something more informative here */ 2157 snprintf(sb->s_id, sizeof(sb->s_id), 2158 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2159 2160 if (sb->s_blocksize == 0) 2161 sb->s_blocksize = nfs_block_bits(server->wsize, 2162 &sb->s_blocksize_bits); 2163 2164 sb->s_bdi = &server->backing_dev_info; 2165 2166 nfs_super_set_maxbytes(sb, server->maxfilesize); 2167 } 2168 2169 /* 2170 * Finish setting up an NFS2/3 superblock 2171 */ 2172 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2173 { 2174 struct nfs_parsed_mount_data *data = mount_info->parsed; 2175 struct nfs_server *server = NFS_SB(sb); 2176 2177 sb->s_blocksize_bits = 0; 2178 sb->s_blocksize = 0; 2179 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2180 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2181 if (data && data->bsize) 2182 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2183 2184 if (server->nfs_client->rpc_ops->version != 2) { 2185 /* The VFS shouldn't apply the umask to mode bits. We will do 2186 * so ourselves when necessary. 2187 */ 2188 sb->s_flags |= MS_POSIXACL; 2189 sb->s_time_gran = 1; 2190 } 2191 2192 nfs_initialise_sb(sb); 2193 } 2194 EXPORT_SYMBOL_GPL(nfs_fill_super); 2195 2196 /* 2197 * Finish setting up a cloned NFS2/3/4 superblock 2198 */ 2199 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2200 { 2201 const struct super_block *old_sb = mount_info->cloned->sb; 2202 struct nfs_server *server = NFS_SB(sb); 2203 2204 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2205 sb->s_blocksize = old_sb->s_blocksize; 2206 sb->s_maxbytes = old_sb->s_maxbytes; 2207 sb->s_xattr = old_sb->s_xattr; 2208 sb->s_op = old_sb->s_op; 2209 sb->s_time_gran = 1; 2210 2211 if (server->nfs_client->rpc_ops->version != 2) { 2212 /* The VFS shouldn't apply the umask to mode bits. We will do 2213 * so ourselves when necessary. 2214 */ 2215 sb->s_flags |= MS_POSIXACL; 2216 } 2217 2218 nfs_initialise_sb(sb); 2219 } 2220 2221 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2222 { 2223 const struct nfs_server *a = s->s_fs_info; 2224 const struct rpc_clnt *clnt_a = a->client; 2225 const struct rpc_clnt *clnt_b = b->client; 2226 2227 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2228 goto Ebusy; 2229 if (a->nfs_client != b->nfs_client) 2230 goto Ebusy; 2231 if (a->flags != b->flags) 2232 goto Ebusy; 2233 if (a->wsize != b->wsize) 2234 goto Ebusy; 2235 if (a->rsize != b->rsize) 2236 goto Ebusy; 2237 if (a->acregmin != b->acregmin) 2238 goto Ebusy; 2239 if (a->acregmax != b->acregmax) 2240 goto Ebusy; 2241 if (a->acdirmin != b->acdirmin) 2242 goto Ebusy; 2243 if (a->acdirmax != b->acdirmax) 2244 goto Ebusy; 2245 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2246 goto Ebusy; 2247 return 1; 2248 Ebusy: 2249 return 0; 2250 } 2251 2252 struct nfs_sb_mountdata { 2253 struct nfs_server *server; 2254 int mntflags; 2255 }; 2256 2257 static int nfs_set_super(struct super_block *s, void *data) 2258 { 2259 struct nfs_sb_mountdata *sb_mntdata = data; 2260 struct nfs_server *server = sb_mntdata->server; 2261 int ret; 2262 2263 s->s_flags = sb_mntdata->mntflags; 2264 s->s_fs_info = server; 2265 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2266 ret = set_anon_super(s, server); 2267 if (ret == 0) 2268 server->s_dev = s->s_dev; 2269 return ret; 2270 } 2271 2272 static int nfs_compare_super_address(struct nfs_server *server1, 2273 struct nfs_server *server2) 2274 { 2275 struct sockaddr *sap1, *sap2; 2276 2277 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2278 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2279 2280 if (sap1->sa_family != sap2->sa_family) 2281 return 0; 2282 2283 switch (sap1->sa_family) { 2284 case AF_INET: { 2285 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2286 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2287 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2288 return 0; 2289 if (sin1->sin_port != sin2->sin_port) 2290 return 0; 2291 break; 2292 } 2293 case AF_INET6: { 2294 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2295 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2296 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2297 return 0; 2298 if (sin1->sin6_port != sin2->sin6_port) 2299 return 0; 2300 break; 2301 } 2302 default: 2303 return 0; 2304 } 2305 2306 return 1; 2307 } 2308 2309 static int nfs_compare_super(struct super_block *sb, void *data) 2310 { 2311 struct nfs_sb_mountdata *sb_mntdata = data; 2312 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2313 int mntflags = sb_mntdata->mntflags; 2314 2315 if (!nfs_compare_super_address(old, server)) 2316 return 0; 2317 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2318 if (old->flags & NFS_MOUNT_UNSHARED) 2319 return 0; 2320 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2321 return 0; 2322 return nfs_compare_mount_options(sb, server, mntflags); 2323 } 2324 2325 #ifdef CONFIG_NFS_FSCACHE 2326 static void nfs_get_cache_cookie(struct super_block *sb, 2327 struct nfs_parsed_mount_data *parsed, 2328 struct nfs_clone_mount *cloned) 2329 { 2330 struct nfs_server *nfss = NFS_SB(sb); 2331 char *uniq = NULL; 2332 int ulen = 0; 2333 2334 nfss->fscache_key = NULL; 2335 nfss->fscache = NULL; 2336 2337 if (parsed) { 2338 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2339 return; 2340 if (parsed->fscache_uniq) { 2341 uniq = parsed->fscache_uniq; 2342 ulen = strlen(parsed->fscache_uniq); 2343 } 2344 } else if (cloned) { 2345 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2346 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2347 return; 2348 if (mnt_s->fscache_key) { 2349 uniq = mnt_s->fscache_key->key.uniquifier; 2350 ulen = mnt_s->fscache_key->key.uniq_len; 2351 }; 2352 } else 2353 return; 2354 2355 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2356 } 2357 #else 2358 static void nfs_get_cache_cookie(struct super_block *sb, 2359 struct nfs_parsed_mount_data *parsed, 2360 struct nfs_clone_mount *cloned) 2361 { 2362 } 2363 #endif 2364 2365 static int nfs_bdi_register(struct nfs_server *server) 2366 { 2367 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2368 } 2369 2370 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2371 struct nfs_mount_info *mount_info) 2372 { 2373 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts); 2374 } 2375 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2376 2377 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2378 struct nfs_mount_info *mount_info) 2379 { 2380 /* clone any lsm security options from the parent to the new sb */ 2381 security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2382 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2383 return -ESTALE; 2384 return 0; 2385 } 2386 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2387 2388 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2389 int flags, const char *dev_name, 2390 struct nfs_mount_info *mount_info, 2391 struct nfs_subversion *nfs_mod) 2392 { 2393 struct super_block *s; 2394 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2395 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2396 struct nfs_sb_mountdata sb_mntdata = { 2397 .mntflags = flags, 2398 .server = server, 2399 }; 2400 int error; 2401 2402 if (server->flags & NFS_MOUNT_UNSHARED) 2403 compare_super = NULL; 2404 2405 /* -o noac implies -o sync */ 2406 if (server->flags & NFS_MOUNT_NOAC) 2407 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2408 2409 /* Get a superblock - note that we may end up sharing one that already exists */ 2410 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2411 if (IS_ERR(s)) { 2412 mntroot = ERR_CAST(s); 2413 goto out_err_nosb; 2414 } 2415 2416 if (s->s_fs_info != server) { 2417 nfs_free_server(server); 2418 server = NULL; 2419 } else { 2420 error = nfs_bdi_register(server); 2421 if (error) { 2422 mntroot = ERR_PTR(error); 2423 goto error_splat_bdi; 2424 } 2425 } 2426 2427 if (!s->s_root) { 2428 /* initial superblock/root creation */ 2429 mount_info->fill_super(s, mount_info); 2430 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2431 } 2432 2433 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2434 if (IS_ERR(mntroot)) 2435 goto error_splat_super; 2436 2437 error = mount_info->set_security(s, mntroot, mount_info); 2438 if (error) 2439 goto error_splat_root; 2440 2441 s->s_flags |= MS_ACTIVE; 2442 2443 out: 2444 return mntroot; 2445 2446 out_err_nosb: 2447 nfs_free_server(server); 2448 goto out; 2449 2450 error_splat_root: 2451 dput(mntroot); 2452 mntroot = ERR_PTR(error); 2453 error_splat_super: 2454 if (server && !s->s_root) 2455 bdi_unregister(&server->backing_dev_info); 2456 error_splat_bdi: 2457 deactivate_locked_super(s); 2458 goto out; 2459 } 2460 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2461 2462 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2463 int flags, const char *dev_name, void *raw_data) 2464 { 2465 struct nfs_mount_info mount_info = { 2466 .fill_super = nfs_fill_super, 2467 .set_security = nfs_set_sb_security, 2468 }; 2469 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2470 struct nfs_subversion *nfs_mod; 2471 int error; 2472 2473 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2474 mount_info.mntfh = nfs_alloc_fhandle(); 2475 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2476 goto out; 2477 2478 /* Validate the mount data */ 2479 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2480 if (error == NFS_TEXT_DATA) 2481 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2482 if (error < 0) { 2483 mntroot = ERR_PTR(error); 2484 goto out; 2485 } 2486 2487 nfs_mod = get_nfs_version(mount_info.parsed->version); 2488 if (IS_ERR(nfs_mod)) { 2489 mntroot = ERR_CAST(nfs_mod); 2490 goto out; 2491 } 2492 2493 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2494 2495 put_nfs_version(nfs_mod); 2496 out: 2497 nfs_free_parsed_mount_data(mount_info.parsed); 2498 nfs_free_fhandle(mount_info.mntfh); 2499 return mntroot; 2500 } 2501 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2502 2503 /* 2504 * Ensure that we unregister the bdi before kill_anon_super 2505 * releases the device name 2506 */ 2507 void nfs_put_super(struct super_block *s) 2508 { 2509 struct nfs_server *server = NFS_SB(s); 2510 2511 bdi_unregister(&server->backing_dev_info); 2512 } 2513 EXPORT_SYMBOL_GPL(nfs_put_super); 2514 2515 /* 2516 * Destroy an NFS2/3 superblock 2517 */ 2518 void nfs_kill_super(struct super_block *s) 2519 { 2520 struct nfs_server *server = NFS_SB(s); 2521 2522 kill_anon_super(s); 2523 nfs_fscache_release_super_cookie(s); 2524 nfs_free_server(server); 2525 } 2526 EXPORT_SYMBOL_GPL(nfs_kill_super); 2527 2528 /* 2529 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2530 */ 2531 static struct dentry * 2532 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2533 const char *dev_name, void *raw_data) 2534 { 2535 struct nfs_clone_mount *data = raw_data; 2536 struct nfs_mount_info mount_info = { 2537 .fill_super = nfs_clone_super, 2538 .set_security = nfs_clone_sb_security, 2539 .cloned = data, 2540 }; 2541 struct nfs_server *server; 2542 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2543 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2544 2545 dprintk("--> nfs_xdev_mount()\n"); 2546 2547 mount_info.mntfh = mount_info.cloned->fh; 2548 2549 /* create a new volume representation */ 2550 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2551 2552 if (IS_ERR(server)) 2553 mntroot = ERR_CAST(server); 2554 else 2555 mntroot = nfs_fs_mount_common(server, flags, 2556 dev_name, &mount_info, nfs_mod); 2557 2558 dprintk("<-- nfs_xdev_mount() = %ld\n", 2559 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2560 return mntroot; 2561 } 2562 2563 #if IS_ENABLED(CONFIG_NFS_V4) 2564 2565 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2566 { 2567 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2568 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2569 } 2570 2571 /* 2572 * Validate NFSv4 mount options 2573 */ 2574 static int nfs4_validate_mount_data(void *options, 2575 struct nfs_parsed_mount_data *args, 2576 const char *dev_name) 2577 { 2578 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2579 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2580 char *c; 2581 2582 if (data == NULL) 2583 goto out_no_data; 2584 2585 args->version = 4; 2586 2587 switch (data->version) { 2588 case 1: 2589 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2590 goto out_no_address; 2591 if (data->host_addrlen == 0) 2592 goto out_no_address; 2593 args->nfs_server.addrlen = data->host_addrlen; 2594 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2595 return -EFAULT; 2596 if (!nfs_verify_server_address(sap)) 2597 goto out_no_address; 2598 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2599 2600 if (data->auth_flavourlen) { 2601 if (data->auth_flavourlen > 1) 2602 goto out_inval_auth; 2603 if (copy_from_user(&args->auth_flavors[0], 2604 data->auth_flavours, 2605 sizeof(args->auth_flavors[0]))) 2606 return -EFAULT; 2607 } 2608 2609 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2610 if (IS_ERR(c)) 2611 return PTR_ERR(c); 2612 args->nfs_server.hostname = c; 2613 2614 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2615 if (IS_ERR(c)) 2616 return PTR_ERR(c); 2617 args->nfs_server.export_path = c; 2618 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2619 2620 c = strndup_user(data->client_addr.data, 16); 2621 if (IS_ERR(c)) 2622 return PTR_ERR(c); 2623 args->client_address = c; 2624 2625 /* 2626 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2627 * can deal with. 2628 */ 2629 2630 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2631 args->rsize = data->rsize; 2632 args->wsize = data->wsize; 2633 args->timeo = data->timeo; 2634 args->retrans = data->retrans; 2635 args->acregmin = data->acregmin; 2636 args->acregmax = data->acregmax; 2637 args->acdirmin = data->acdirmin; 2638 args->acdirmax = data->acdirmax; 2639 args->nfs_server.protocol = data->proto; 2640 nfs_validate_transport_protocol(args); 2641 2642 break; 2643 default: 2644 return NFS_TEXT_DATA; 2645 } 2646 2647 return 0; 2648 2649 out_no_data: 2650 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2651 return -EINVAL; 2652 2653 out_inval_auth: 2654 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2655 data->auth_flavourlen); 2656 return -EINVAL; 2657 2658 out_no_address: 2659 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2660 return -EINVAL; 2661 } 2662 2663 /* 2664 * NFS v4 module parameters need to stay in the 2665 * NFS client for backwards compatibility 2666 */ 2667 unsigned int nfs_callback_set_tcpport; 2668 unsigned short nfs_callback_tcpport; 2669 /* Default cache timeout is 10 minutes */ 2670 unsigned int nfs_idmap_cache_timeout = 600; 2671 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2672 bool nfs4_disable_idmapping = true; 2673 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2674 unsigned short send_implementation_id = 1; 2675 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2676 2677 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2678 EXPORT_SYMBOL_GPL(nfs_callback_tcpport); 2679 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2680 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2681 EXPORT_SYMBOL_GPL(max_session_slots); 2682 EXPORT_SYMBOL_GPL(send_implementation_id); 2683 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2684 2685 #define NFS_CALLBACK_MAXPORTNR (65535U) 2686 2687 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2688 { 2689 unsigned long num; 2690 int ret; 2691 2692 if (!val) 2693 return -EINVAL; 2694 ret = kstrtoul(val, 0, &num); 2695 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2696 return -EINVAL; 2697 *((unsigned int *)kp->arg) = num; 2698 return 0; 2699 } 2700 static struct kernel_param_ops param_ops_portnr = { 2701 .set = param_set_portnr, 2702 .get = param_get_uint, 2703 }; 2704 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2705 2706 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2707 module_param(nfs_idmap_cache_timeout, int, 0644); 2708 module_param(nfs4_disable_idmapping, bool, 0644); 2709 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2710 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2711 MODULE_PARM_DESC(nfs4_disable_idmapping, 2712 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2713 module_param(max_session_slots, ushort, 0644); 2714 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2715 "requests the client will negotiate"); 2716 module_param(send_implementation_id, ushort, 0644); 2717 MODULE_PARM_DESC(send_implementation_id, 2718 "Send implementation ID with NFSv4.1 exchange_id"); 2719 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2720 MODULE_ALIAS("nfs4"); 2721 2722 #endif /* CONFIG_NFS_V4 */ 2723