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 MODULE_ALIAS_FS("nfs"); 298 EXPORT_SYMBOL_GPL(nfs_fs_type); 299 300 struct file_system_type nfs_xdev_fs_type = { 301 .owner = THIS_MODULE, 302 .name = "nfs", 303 .mount = nfs_xdev_mount, 304 .kill_sb = nfs_kill_super, 305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 306 }; 307 308 const struct super_operations nfs_sops = { 309 .alloc_inode = nfs_alloc_inode, 310 .destroy_inode = nfs_destroy_inode, 311 .write_inode = nfs_write_inode, 312 .drop_inode = nfs_drop_inode, 313 .put_super = nfs_put_super, 314 .statfs = nfs_statfs, 315 .evict_inode = nfs_evict_inode, 316 .umount_begin = nfs_umount_begin, 317 .show_options = nfs_show_options, 318 .show_devname = nfs_show_devname, 319 .show_path = nfs_show_path, 320 .show_stats = nfs_show_stats, 321 .remount_fs = nfs_remount, 322 }; 323 EXPORT_SYMBOL_GPL(nfs_sops); 324 325 #if IS_ENABLED(CONFIG_NFS_V4) 326 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 327 static int nfs4_validate_mount_data(void *options, 328 struct nfs_parsed_mount_data *args, const char *dev_name); 329 330 struct file_system_type nfs4_fs_type = { 331 .owner = THIS_MODULE, 332 .name = "nfs4", 333 .mount = nfs_fs_mount, 334 .kill_sb = nfs_kill_super, 335 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 336 }; 337 MODULE_ALIAS_FS("nfs4"); 338 MODULE_ALIAS("nfs4"); 339 EXPORT_SYMBOL_GPL(nfs4_fs_type); 340 341 static int __init register_nfs4_fs(void) 342 { 343 return register_filesystem(&nfs4_fs_type); 344 } 345 346 static void unregister_nfs4_fs(void) 347 { 348 unregister_filesystem(&nfs4_fs_type); 349 } 350 #else 351 static int __init register_nfs4_fs(void) 352 { 353 return 0; 354 } 355 356 static void unregister_nfs4_fs(void) 357 { 358 } 359 #endif 360 361 static struct shrinker acl_shrinker = { 362 .shrink = nfs_access_cache_shrinker, 363 .seeks = DEFAULT_SEEKS, 364 }; 365 366 /* 367 * Register the NFS filesystems 368 */ 369 int __init register_nfs_fs(void) 370 { 371 int ret; 372 373 ret = register_filesystem(&nfs_fs_type); 374 if (ret < 0) 375 goto error_0; 376 377 ret = register_nfs4_fs(); 378 if (ret < 0) 379 goto error_1; 380 381 ret = nfs_register_sysctl(); 382 if (ret < 0) 383 goto error_2; 384 register_shrinker(&acl_shrinker); 385 return 0; 386 387 error_2: 388 unregister_nfs4_fs(); 389 error_1: 390 unregister_filesystem(&nfs_fs_type); 391 error_0: 392 return ret; 393 } 394 395 /* 396 * Unregister the NFS filesystems 397 */ 398 void __exit unregister_nfs_fs(void) 399 { 400 unregister_shrinker(&acl_shrinker); 401 nfs_unregister_sysctl(); 402 unregister_nfs4_fs(); 403 unregister_filesystem(&nfs_fs_type); 404 } 405 406 void nfs_sb_active(struct super_block *sb) 407 { 408 struct nfs_server *server = NFS_SB(sb); 409 410 if (atomic_inc_return(&server->active) == 1) 411 atomic_inc(&sb->s_active); 412 } 413 EXPORT_SYMBOL_GPL(nfs_sb_active); 414 415 void nfs_sb_deactive(struct super_block *sb) 416 { 417 struct nfs_server *server = NFS_SB(sb); 418 419 if (atomic_dec_and_test(&server->active)) 420 deactivate_super(sb); 421 } 422 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 423 424 /* 425 * Deliver file system statistics to userspace 426 */ 427 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 428 { 429 struct nfs_server *server = NFS_SB(dentry->d_sb); 430 unsigned char blockbits; 431 unsigned long blockres; 432 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 433 struct nfs_fsstat res; 434 int error = -ENOMEM; 435 436 res.fattr = nfs_alloc_fattr(); 437 if (res.fattr == NULL) 438 goto out_err; 439 440 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 441 if (unlikely(error == -ESTALE)) { 442 struct dentry *pd_dentry; 443 444 pd_dentry = dget_parent(dentry); 445 if (pd_dentry != NULL) { 446 nfs_zap_caches(pd_dentry->d_inode); 447 dput(pd_dentry); 448 } 449 } 450 nfs_free_fattr(res.fattr); 451 if (error < 0) 452 goto out_err; 453 454 buf->f_type = NFS_SUPER_MAGIC; 455 456 /* 457 * Current versions of glibc do not correctly handle the 458 * case where f_frsize != f_bsize. Eventually we want to 459 * report the value of wtmult in this field. 460 */ 461 buf->f_frsize = dentry->d_sb->s_blocksize; 462 463 /* 464 * On most *nix systems, f_blocks, f_bfree, and f_bavail 465 * are reported in units of f_frsize. Linux hasn't had 466 * an f_frsize field in its statfs struct until recently, 467 * thus historically Linux's sys_statfs reports these 468 * fields in units of f_bsize. 469 */ 470 buf->f_bsize = dentry->d_sb->s_blocksize; 471 blockbits = dentry->d_sb->s_blocksize_bits; 472 blockres = (1 << blockbits) - 1; 473 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 474 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 475 buf->f_bavail = (res.abytes + blockres) >> blockbits; 476 477 buf->f_files = res.tfiles; 478 buf->f_ffree = res.afiles; 479 480 buf->f_namelen = server->namelen; 481 482 return 0; 483 484 out_err: 485 dprintk("%s: statfs error = %d\n", __func__, -error); 486 return error; 487 } 488 EXPORT_SYMBOL_GPL(nfs_statfs); 489 490 /* 491 * Map the security flavour number to a name 492 */ 493 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 494 { 495 static const struct { 496 rpc_authflavor_t flavour; 497 const char *str; 498 } sec_flavours[] = { 499 { RPC_AUTH_NULL, "null" }, 500 { RPC_AUTH_UNIX, "sys" }, 501 { RPC_AUTH_GSS_KRB5, "krb5" }, 502 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 503 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 504 { RPC_AUTH_GSS_LKEY, "lkey" }, 505 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 506 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 507 { RPC_AUTH_GSS_SPKM, "spkm" }, 508 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 509 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 510 { UINT_MAX, "unknown" } 511 }; 512 int i; 513 514 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 515 if (sec_flavours[i].flavour == flavour) 516 break; 517 } 518 return sec_flavours[i].str; 519 } 520 521 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 522 int showdefaults) 523 { 524 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 525 526 seq_printf(m, ",mountproto="); 527 switch (sap->sa_family) { 528 case AF_INET: 529 switch (nfss->mountd_protocol) { 530 case IPPROTO_UDP: 531 seq_printf(m, RPCBIND_NETID_UDP); 532 break; 533 case IPPROTO_TCP: 534 seq_printf(m, RPCBIND_NETID_TCP); 535 break; 536 default: 537 if (showdefaults) 538 seq_printf(m, "auto"); 539 } 540 break; 541 case AF_INET6: 542 switch (nfss->mountd_protocol) { 543 case IPPROTO_UDP: 544 seq_printf(m, RPCBIND_NETID_UDP6); 545 break; 546 case IPPROTO_TCP: 547 seq_printf(m, RPCBIND_NETID_TCP6); 548 break; 549 default: 550 if (showdefaults) 551 seq_printf(m, "auto"); 552 } 553 break; 554 default: 555 if (showdefaults) 556 seq_printf(m, "auto"); 557 } 558 } 559 560 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 561 int showdefaults) 562 { 563 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 564 565 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 566 return; 567 568 switch (sap->sa_family) { 569 case AF_INET: { 570 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 571 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 572 break; 573 } 574 case AF_INET6: { 575 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 576 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 577 break; 578 } 579 default: 580 if (showdefaults) 581 seq_printf(m, ",mountaddr=unspecified"); 582 } 583 584 if (nfss->mountd_version || showdefaults) 585 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 586 if ((nfss->mountd_port && 587 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 588 showdefaults) 589 seq_printf(m, ",mountport=%u", nfss->mountd_port); 590 591 nfs_show_mountd_netid(m, nfss, showdefaults); 592 } 593 594 #if IS_ENABLED(CONFIG_NFS_V4) 595 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 596 int showdefaults) 597 { 598 struct nfs_client *clp = nfss->nfs_client; 599 600 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 601 } 602 #else 603 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 604 int showdefaults) 605 { 606 } 607 #endif 608 609 static void nfs_show_nfs_version(struct seq_file *m, 610 unsigned int version, 611 unsigned int minorversion) 612 { 613 seq_printf(m, ",vers=%u", version); 614 if (version == 4) 615 seq_printf(m, ".%u", minorversion); 616 } 617 618 /* 619 * Describe the mount options in force on this server representation 620 */ 621 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 622 int showdefaults) 623 { 624 static const struct proc_nfs_info { 625 int flag; 626 const char *str; 627 const char *nostr; 628 } nfs_info[] = { 629 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 630 { NFS_MOUNT_POSIX, ",posix", "" }, 631 { NFS_MOUNT_NOCTO, ",nocto", "" }, 632 { NFS_MOUNT_NOAC, ",noac", "" }, 633 { NFS_MOUNT_NONLM, ",nolock", "" }, 634 { NFS_MOUNT_NOACL, ",noacl", "" }, 635 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 636 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 637 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 638 { 0, NULL, NULL } 639 }; 640 const struct proc_nfs_info *nfs_infop; 641 struct nfs_client *clp = nfss->nfs_client; 642 u32 version = clp->rpc_ops->version; 643 int local_flock, local_fcntl; 644 645 nfs_show_nfs_version(m, version, clp->cl_minorversion); 646 seq_printf(m, ",rsize=%u", nfss->rsize); 647 seq_printf(m, ",wsize=%u", nfss->wsize); 648 if (nfss->bsize != 0) 649 seq_printf(m, ",bsize=%u", nfss->bsize); 650 seq_printf(m, ",namlen=%u", nfss->namelen); 651 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 652 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 653 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 654 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 655 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 656 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 657 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 658 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 659 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 660 if (nfss->flags & nfs_infop->flag) 661 seq_puts(m, nfs_infop->str); 662 else 663 seq_puts(m, nfs_infop->nostr); 664 } 665 rcu_read_lock(); 666 seq_printf(m, ",proto=%s", 667 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 668 rcu_read_unlock(); 669 if (version == 4) { 670 if (nfss->port != NFS_PORT) 671 seq_printf(m, ",port=%u", nfss->port); 672 } else 673 if (nfss->port) 674 seq_printf(m, ",port=%u", nfss->port); 675 676 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 677 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 678 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 679 680 if (version != 4) 681 nfs_show_mountd_options(m, nfss, showdefaults); 682 else 683 nfs_show_nfsv4_options(m, nfss, showdefaults); 684 685 if (nfss->options & NFS_OPTION_FSCACHE) 686 seq_printf(m, ",fsc"); 687 688 if (nfss->options & NFS_OPTION_MIGRATION) 689 seq_printf(m, ",migration"); 690 691 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 692 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 693 seq_printf(m, ",lookupcache=none"); 694 else 695 seq_printf(m, ",lookupcache=pos"); 696 } 697 698 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 699 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 700 701 if (!local_flock && !local_fcntl) 702 seq_printf(m, ",local_lock=none"); 703 else if (local_flock && local_fcntl) 704 seq_printf(m, ",local_lock=all"); 705 else if (local_flock) 706 seq_printf(m, ",local_lock=flock"); 707 else 708 seq_printf(m, ",local_lock=posix"); 709 } 710 711 /* 712 * Describe the mount options on this VFS mountpoint 713 */ 714 int nfs_show_options(struct seq_file *m, struct dentry *root) 715 { 716 struct nfs_server *nfss = NFS_SB(root->d_sb); 717 718 nfs_show_mount_options(m, nfss, 0); 719 720 rcu_read_lock(); 721 seq_printf(m, ",addr=%s", 722 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 723 RPC_DISPLAY_ADDR)); 724 rcu_read_unlock(); 725 726 return 0; 727 } 728 EXPORT_SYMBOL_GPL(nfs_show_options); 729 730 #if IS_ENABLED(CONFIG_NFS_V4) 731 #ifdef CONFIG_NFS_V4_1 732 static void show_sessions(struct seq_file *m, struct nfs_server *server) 733 { 734 if (nfs4_has_session(server->nfs_client)) 735 seq_printf(m, ",sessions"); 736 } 737 #else 738 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 739 #endif 740 #endif 741 742 #ifdef CONFIG_NFS_V4_1 743 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 744 { 745 seq_printf(m, ",pnfs="); 746 if (server->pnfs_curr_ld) 747 seq_printf(m, "%s", server->pnfs_curr_ld->name); 748 else 749 seq_printf(m, "not configured"); 750 } 751 752 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 753 { 754 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 755 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 756 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 757 "date='%llu,%u'", 758 impl_id->name, impl_id->domain, 759 impl_id->date.seconds, impl_id->date.nseconds); 760 } 761 } 762 #else 763 #if IS_ENABLED(CONFIG_NFS_V4) 764 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 765 { 766 } 767 #endif 768 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 769 { 770 } 771 #endif 772 773 int nfs_show_devname(struct seq_file *m, struct dentry *root) 774 { 775 char *page = (char *) __get_free_page(GFP_KERNEL); 776 char *devname, *dummy; 777 int err = 0; 778 if (!page) 779 return -ENOMEM; 780 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 781 if (IS_ERR(devname)) 782 err = PTR_ERR(devname); 783 else 784 seq_escape(m, devname, " \t\n\\"); 785 free_page((unsigned long)page); 786 return err; 787 } 788 EXPORT_SYMBOL_GPL(nfs_show_devname); 789 790 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 791 { 792 seq_puts(m, "/"); 793 return 0; 794 } 795 EXPORT_SYMBOL_GPL(nfs_show_path); 796 797 /* 798 * Present statistical information for this VFS mountpoint 799 */ 800 int nfs_show_stats(struct seq_file *m, struct dentry *root) 801 { 802 int i, cpu; 803 struct nfs_server *nfss = NFS_SB(root->d_sb); 804 struct rpc_auth *auth = nfss->client->cl_auth; 805 struct nfs_iostats totals = { }; 806 807 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 808 809 /* 810 * Display all mount option settings 811 */ 812 seq_printf(m, "\n\topts:\t"); 813 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 814 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 815 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 816 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 817 nfs_show_mount_options(m, nfss, 1); 818 819 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 820 821 show_implementation_id(m, nfss); 822 823 seq_printf(m, "\n\tcaps:\t"); 824 seq_printf(m, "caps=0x%x", nfss->caps); 825 seq_printf(m, ",wtmult=%u", nfss->wtmult); 826 seq_printf(m, ",dtsize=%u", nfss->dtsize); 827 seq_printf(m, ",bsize=%u", nfss->bsize); 828 seq_printf(m, ",namlen=%u", nfss->namelen); 829 830 #if IS_ENABLED(CONFIG_NFS_V4) 831 if (nfss->nfs_client->rpc_ops->version == 4) { 832 seq_printf(m, "\n\tnfsv4:\t"); 833 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 834 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 835 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 836 show_sessions(m, nfss); 837 show_pnfs(m, nfss); 838 } 839 #endif 840 841 /* 842 * Display security flavor in effect for this mount 843 */ 844 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 845 if (auth->au_flavor) 846 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 847 848 /* 849 * Display superblock I/O counters 850 */ 851 for_each_possible_cpu(cpu) { 852 struct nfs_iostats *stats; 853 854 preempt_disable(); 855 stats = per_cpu_ptr(nfss->io_stats, cpu); 856 857 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 858 totals.events[i] += stats->events[i]; 859 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 860 totals.bytes[i] += stats->bytes[i]; 861 #ifdef CONFIG_NFS_FSCACHE 862 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 863 totals.fscache[i] += stats->fscache[i]; 864 #endif 865 866 preempt_enable(); 867 } 868 869 seq_printf(m, "\n\tevents:\t"); 870 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 871 seq_printf(m, "%lu ", totals.events[i]); 872 seq_printf(m, "\n\tbytes:\t"); 873 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 874 seq_printf(m, "%Lu ", totals.bytes[i]); 875 #ifdef CONFIG_NFS_FSCACHE 876 if (nfss->options & NFS_OPTION_FSCACHE) { 877 seq_printf(m, "\n\tfsc:\t"); 878 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 879 seq_printf(m, "%Lu ", totals.bytes[i]); 880 } 881 #endif 882 seq_printf(m, "\n"); 883 884 rpc_print_iostats(m, nfss->client); 885 886 return 0; 887 } 888 EXPORT_SYMBOL_GPL(nfs_show_stats); 889 890 /* 891 * Begin unmount by attempting to remove all automounted mountpoints we added 892 * in response to xdev traversals and referrals 893 */ 894 void nfs_umount_begin(struct super_block *sb) 895 { 896 struct nfs_server *server; 897 struct rpc_clnt *rpc; 898 899 server = NFS_SB(sb); 900 /* -EIO all pending I/O */ 901 rpc = server->client_acl; 902 if (!IS_ERR(rpc)) 903 rpc_killall_tasks(rpc); 904 rpc = server->client; 905 if (!IS_ERR(rpc)) 906 rpc_killall_tasks(rpc); 907 } 908 EXPORT_SYMBOL_GPL(nfs_umount_begin); 909 910 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 911 { 912 struct nfs_parsed_mount_data *data; 913 914 data = kzalloc(sizeof(*data), GFP_KERNEL); 915 if (data) { 916 data->acregmin = NFS_DEF_ACREGMIN; 917 data->acregmax = NFS_DEF_ACREGMAX; 918 data->acdirmin = NFS_DEF_ACDIRMIN; 919 data->acdirmax = NFS_DEF_ACDIRMAX; 920 data->mount_server.port = NFS_UNSPEC_PORT; 921 data->nfs_server.port = NFS_UNSPEC_PORT; 922 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 923 data->auth_flavors[0] = RPC_AUTH_MAXFLAVOR; 924 data->auth_flavor_len = 1; 925 data->minorversion = 0; 926 data->need_mount = true; 927 data->net = current->nsproxy->net_ns; 928 security_init_mnt_opts(&data->lsm_opts); 929 } 930 return data; 931 } 932 933 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 934 { 935 if (data) { 936 kfree(data->client_address); 937 kfree(data->mount_server.hostname); 938 kfree(data->nfs_server.export_path); 939 kfree(data->nfs_server.hostname); 940 kfree(data->fscache_uniq); 941 security_free_mnt_opts(&data->lsm_opts); 942 kfree(data); 943 } 944 } 945 946 /* 947 * Sanity-check a server address provided by the mount command. 948 * 949 * Address family must be initialized, and address must not be 950 * the ANY address for that family. 951 */ 952 static int nfs_verify_server_address(struct sockaddr *addr) 953 { 954 switch (addr->sa_family) { 955 case AF_INET: { 956 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 957 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 958 } 959 case AF_INET6: { 960 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 961 return !ipv6_addr_any(sa); 962 } 963 } 964 965 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 966 return 0; 967 } 968 969 /* 970 * Select between a default port value and a user-specified port value. 971 * If a zero value is set, then autobind will be used. 972 */ 973 static void nfs_set_port(struct sockaddr *sap, int *port, 974 const unsigned short default_port) 975 { 976 if (*port == NFS_UNSPEC_PORT) 977 *port = default_port; 978 979 rpc_set_port(sap, *port); 980 } 981 982 /* 983 * Sanity check the NFS transport protocol. 984 * 985 */ 986 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 987 { 988 switch (mnt->nfs_server.protocol) { 989 case XPRT_TRANSPORT_UDP: 990 case XPRT_TRANSPORT_TCP: 991 case XPRT_TRANSPORT_RDMA: 992 break; 993 default: 994 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 995 } 996 } 997 998 /* 999 * For text based NFSv2/v3 mounts, the mount protocol transport default 1000 * settings should depend upon the specified NFS transport. 1001 */ 1002 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1003 { 1004 nfs_validate_transport_protocol(mnt); 1005 1006 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1007 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1008 return; 1009 switch (mnt->nfs_server.protocol) { 1010 case XPRT_TRANSPORT_UDP: 1011 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1012 break; 1013 case XPRT_TRANSPORT_TCP: 1014 case XPRT_TRANSPORT_RDMA: 1015 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1016 } 1017 } 1018 1019 /* 1020 * Parse the value of the 'sec=' option. 1021 */ 1022 static int nfs_parse_security_flavors(char *value, 1023 struct nfs_parsed_mount_data *mnt) 1024 { 1025 substring_t args[MAX_OPT_ARGS]; 1026 1027 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1028 1029 switch (match_token(value, nfs_secflavor_tokens, args)) { 1030 case Opt_sec_none: 1031 mnt->auth_flavors[0] = RPC_AUTH_NULL; 1032 break; 1033 case Opt_sec_sys: 1034 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 1035 break; 1036 case Opt_sec_krb5: 1037 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 1038 break; 1039 case Opt_sec_krb5i: 1040 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 1041 break; 1042 case Opt_sec_krb5p: 1043 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 1044 break; 1045 case Opt_sec_lkey: 1046 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 1047 break; 1048 case Opt_sec_lkeyi: 1049 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 1050 break; 1051 case Opt_sec_lkeyp: 1052 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 1053 break; 1054 case Opt_sec_spkm: 1055 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 1056 break; 1057 case Opt_sec_spkmi: 1058 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 1059 break; 1060 case Opt_sec_spkmp: 1061 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 1062 break; 1063 default: 1064 return 0; 1065 } 1066 1067 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 1068 mnt->auth_flavor_len = 1; 1069 return 1; 1070 } 1071 1072 static int nfs_parse_version_string(char *string, 1073 struct nfs_parsed_mount_data *mnt, 1074 substring_t *args) 1075 { 1076 mnt->flags &= ~NFS_MOUNT_VER3; 1077 switch (match_token(string, nfs_vers_tokens, args)) { 1078 case Opt_vers_2: 1079 mnt->version = 2; 1080 break; 1081 case Opt_vers_3: 1082 mnt->flags |= NFS_MOUNT_VER3; 1083 mnt->version = 3; 1084 break; 1085 case Opt_vers_4: 1086 /* Backward compatibility option. In future, 1087 * the mount program should always supply 1088 * a NFSv4 minor version number. 1089 */ 1090 mnt->version = 4; 1091 break; 1092 case Opt_vers_4_0: 1093 mnt->version = 4; 1094 mnt->minorversion = 0; 1095 break; 1096 case Opt_vers_4_1: 1097 mnt->version = 4; 1098 mnt->minorversion = 1; 1099 break; 1100 default: 1101 return 0; 1102 } 1103 return 1; 1104 } 1105 1106 static int nfs_get_option_str(substring_t args[], char **option) 1107 { 1108 kfree(*option); 1109 *option = match_strdup(args); 1110 return !*option; 1111 } 1112 1113 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1114 { 1115 int rc; 1116 char *string; 1117 1118 string = match_strdup(args); 1119 if (string == NULL) 1120 return -ENOMEM; 1121 rc = kstrtoul(string, 10, option); 1122 kfree(string); 1123 1124 return rc; 1125 } 1126 1127 /* 1128 * Error-check and convert a string of mount options from user space into 1129 * a data structure. The whole mount string is processed; bad options are 1130 * skipped as they are encountered. If there were no errors, return 1; 1131 * otherwise return 0 (zero). 1132 */ 1133 static int nfs_parse_mount_options(char *raw, 1134 struct nfs_parsed_mount_data *mnt) 1135 { 1136 char *p, *string, *secdata; 1137 int rc, sloppy = 0, invalid_option = 0; 1138 unsigned short protofamily = AF_UNSPEC; 1139 unsigned short mountfamily = AF_UNSPEC; 1140 1141 if (!raw) { 1142 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1143 return 1; 1144 } 1145 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1146 1147 secdata = alloc_secdata(); 1148 if (!secdata) 1149 goto out_nomem; 1150 1151 rc = security_sb_copy_data(raw, secdata); 1152 if (rc) 1153 goto out_security_failure; 1154 1155 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1156 if (rc) 1157 goto out_security_failure; 1158 1159 free_secdata(secdata); 1160 1161 while ((p = strsep(&raw, ",")) != NULL) { 1162 substring_t args[MAX_OPT_ARGS]; 1163 unsigned long option; 1164 int token; 1165 1166 if (!*p) 1167 continue; 1168 1169 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1170 1171 token = match_token(p, nfs_mount_option_tokens, args); 1172 switch (token) { 1173 1174 /* 1175 * boolean options: foo/nofoo 1176 */ 1177 case Opt_soft: 1178 mnt->flags |= NFS_MOUNT_SOFT; 1179 break; 1180 case Opt_hard: 1181 mnt->flags &= ~NFS_MOUNT_SOFT; 1182 break; 1183 case Opt_posix: 1184 mnt->flags |= NFS_MOUNT_POSIX; 1185 break; 1186 case Opt_noposix: 1187 mnt->flags &= ~NFS_MOUNT_POSIX; 1188 break; 1189 case Opt_cto: 1190 mnt->flags &= ~NFS_MOUNT_NOCTO; 1191 break; 1192 case Opt_nocto: 1193 mnt->flags |= NFS_MOUNT_NOCTO; 1194 break; 1195 case Opt_ac: 1196 mnt->flags &= ~NFS_MOUNT_NOAC; 1197 break; 1198 case Opt_noac: 1199 mnt->flags |= NFS_MOUNT_NOAC; 1200 break; 1201 case Opt_lock: 1202 mnt->flags &= ~NFS_MOUNT_NONLM; 1203 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1204 NFS_MOUNT_LOCAL_FCNTL); 1205 break; 1206 case Opt_nolock: 1207 mnt->flags |= NFS_MOUNT_NONLM; 1208 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1209 NFS_MOUNT_LOCAL_FCNTL); 1210 break; 1211 case Opt_udp: 1212 mnt->flags &= ~NFS_MOUNT_TCP; 1213 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1214 break; 1215 case Opt_tcp: 1216 mnt->flags |= NFS_MOUNT_TCP; 1217 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1218 break; 1219 case Opt_rdma: 1220 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1221 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1222 xprt_load_transport(p); 1223 break; 1224 case Opt_acl: 1225 mnt->flags &= ~NFS_MOUNT_NOACL; 1226 break; 1227 case Opt_noacl: 1228 mnt->flags |= NFS_MOUNT_NOACL; 1229 break; 1230 case Opt_rdirplus: 1231 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1232 break; 1233 case Opt_nordirplus: 1234 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1235 break; 1236 case Opt_sharecache: 1237 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1238 break; 1239 case Opt_nosharecache: 1240 mnt->flags |= NFS_MOUNT_UNSHARED; 1241 break; 1242 case Opt_resvport: 1243 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1244 break; 1245 case Opt_noresvport: 1246 mnt->flags |= NFS_MOUNT_NORESVPORT; 1247 break; 1248 case Opt_fscache: 1249 mnt->options |= NFS_OPTION_FSCACHE; 1250 kfree(mnt->fscache_uniq); 1251 mnt->fscache_uniq = NULL; 1252 break; 1253 case Opt_nofscache: 1254 mnt->options &= ~NFS_OPTION_FSCACHE; 1255 kfree(mnt->fscache_uniq); 1256 mnt->fscache_uniq = NULL; 1257 break; 1258 case Opt_migration: 1259 mnt->options |= NFS_OPTION_MIGRATION; 1260 break; 1261 case Opt_nomigration: 1262 mnt->options &= NFS_OPTION_MIGRATION; 1263 break; 1264 1265 /* 1266 * options that take numeric values 1267 */ 1268 case Opt_port: 1269 if (nfs_get_option_ul(args, &option) || 1270 option > USHRT_MAX) 1271 goto out_invalid_value; 1272 mnt->nfs_server.port = option; 1273 break; 1274 case Opt_rsize: 1275 if (nfs_get_option_ul(args, &option)) 1276 goto out_invalid_value; 1277 mnt->rsize = option; 1278 break; 1279 case Opt_wsize: 1280 if (nfs_get_option_ul(args, &option)) 1281 goto out_invalid_value; 1282 mnt->wsize = option; 1283 break; 1284 case Opt_bsize: 1285 if (nfs_get_option_ul(args, &option)) 1286 goto out_invalid_value; 1287 mnt->bsize = option; 1288 break; 1289 case Opt_timeo: 1290 if (nfs_get_option_ul(args, &option) || option == 0) 1291 goto out_invalid_value; 1292 mnt->timeo = option; 1293 break; 1294 case Opt_retrans: 1295 if (nfs_get_option_ul(args, &option) || option == 0) 1296 goto out_invalid_value; 1297 mnt->retrans = option; 1298 break; 1299 case Opt_acregmin: 1300 if (nfs_get_option_ul(args, &option)) 1301 goto out_invalid_value; 1302 mnt->acregmin = option; 1303 break; 1304 case Opt_acregmax: 1305 if (nfs_get_option_ul(args, &option)) 1306 goto out_invalid_value; 1307 mnt->acregmax = option; 1308 break; 1309 case Opt_acdirmin: 1310 if (nfs_get_option_ul(args, &option)) 1311 goto out_invalid_value; 1312 mnt->acdirmin = option; 1313 break; 1314 case Opt_acdirmax: 1315 if (nfs_get_option_ul(args, &option)) 1316 goto out_invalid_value; 1317 mnt->acdirmax = option; 1318 break; 1319 case Opt_actimeo: 1320 if (nfs_get_option_ul(args, &option)) 1321 goto out_invalid_value; 1322 mnt->acregmin = mnt->acregmax = 1323 mnt->acdirmin = mnt->acdirmax = option; 1324 break; 1325 case Opt_namelen: 1326 if (nfs_get_option_ul(args, &option)) 1327 goto out_invalid_value; 1328 mnt->namlen = option; 1329 break; 1330 case Opt_mountport: 1331 if (nfs_get_option_ul(args, &option) || 1332 option > USHRT_MAX) 1333 goto out_invalid_value; 1334 mnt->mount_server.port = option; 1335 break; 1336 case Opt_mountvers: 1337 if (nfs_get_option_ul(args, &option) || 1338 option < NFS_MNT_VERSION || 1339 option > NFS_MNT3_VERSION) 1340 goto out_invalid_value; 1341 mnt->mount_server.version = option; 1342 break; 1343 case Opt_minorversion: 1344 if (nfs_get_option_ul(args, &option)) 1345 goto out_invalid_value; 1346 if (option > NFS4_MAX_MINOR_VERSION) 1347 goto out_invalid_value; 1348 mnt->minorversion = option; 1349 break; 1350 1351 /* 1352 * options that take text values 1353 */ 1354 case Opt_nfsvers: 1355 string = match_strdup(args); 1356 if (string == NULL) 1357 goto out_nomem; 1358 rc = nfs_parse_version_string(string, mnt, args); 1359 kfree(string); 1360 if (!rc) 1361 goto out_invalid_value; 1362 break; 1363 case Opt_sec: 1364 string = match_strdup(args); 1365 if (string == NULL) 1366 goto out_nomem; 1367 rc = nfs_parse_security_flavors(string, mnt); 1368 kfree(string); 1369 if (!rc) { 1370 dfprintk(MOUNT, "NFS: unrecognized " 1371 "security flavor\n"); 1372 return 0; 1373 } 1374 break; 1375 case Opt_proto: 1376 string = match_strdup(args); 1377 if (string == NULL) 1378 goto out_nomem; 1379 token = match_token(string, 1380 nfs_xprt_protocol_tokens, args); 1381 1382 protofamily = AF_INET; 1383 switch (token) { 1384 case Opt_xprt_udp6: 1385 protofamily = AF_INET6; 1386 case Opt_xprt_udp: 1387 mnt->flags &= ~NFS_MOUNT_TCP; 1388 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1389 break; 1390 case Opt_xprt_tcp6: 1391 protofamily = AF_INET6; 1392 case Opt_xprt_tcp: 1393 mnt->flags |= NFS_MOUNT_TCP; 1394 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1395 break; 1396 case Opt_xprt_rdma: 1397 /* vector side protocols to TCP */ 1398 mnt->flags |= NFS_MOUNT_TCP; 1399 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1400 xprt_load_transport(string); 1401 break; 1402 default: 1403 dfprintk(MOUNT, "NFS: unrecognized " 1404 "transport protocol\n"); 1405 kfree(string); 1406 return 0; 1407 } 1408 kfree(string); 1409 break; 1410 case Opt_mountproto: 1411 string = match_strdup(args); 1412 if (string == NULL) 1413 goto out_nomem; 1414 token = match_token(string, 1415 nfs_xprt_protocol_tokens, args); 1416 kfree(string); 1417 1418 mountfamily = AF_INET; 1419 switch (token) { 1420 case Opt_xprt_udp6: 1421 mountfamily = AF_INET6; 1422 case Opt_xprt_udp: 1423 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1424 break; 1425 case Opt_xprt_tcp6: 1426 mountfamily = AF_INET6; 1427 case Opt_xprt_tcp: 1428 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1429 break; 1430 case Opt_xprt_rdma: /* not used for side protocols */ 1431 default: 1432 dfprintk(MOUNT, "NFS: unrecognized " 1433 "transport protocol\n"); 1434 return 0; 1435 } 1436 break; 1437 case Opt_addr: 1438 string = match_strdup(args); 1439 if (string == NULL) 1440 goto out_nomem; 1441 mnt->nfs_server.addrlen = 1442 rpc_pton(mnt->net, string, strlen(string), 1443 (struct sockaddr *) 1444 &mnt->nfs_server.address, 1445 sizeof(mnt->nfs_server.address)); 1446 kfree(string); 1447 if (mnt->nfs_server.addrlen == 0) 1448 goto out_invalid_address; 1449 break; 1450 case Opt_clientaddr: 1451 if (nfs_get_option_str(args, &mnt->client_address)) 1452 goto out_nomem; 1453 break; 1454 case Opt_mounthost: 1455 if (nfs_get_option_str(args, 1456 &mnt->mount_server.hostname)) 1457 goto out_nomem; 1458 break; 1459 case Opt_mountaddr: 1460 string = match_strdup(args); 1461 if (string == NULL) 1462 goto out_nomem; 1463 mnt->mount_server.addrlen = 1464 rpc_pton(mnt->net, string, strlen(string), 1465 (struct sockaddr *) 1466 &mnt->mount_server.address, 1467 sizeof(mnt->mount_server.address)); 1468 kfree(string); 1469 if (mnt->mount_server.addrlen == 0) 1470 goto out_invalid_address; 1471 break; 1472 case Opt_lookupcache: 1473 string = match_strdup(args); 1474 if (string == NULL) 1475 goto out_nomem; 1476 token = match_token(string, 1477 nfs_lookupcache_tokens, args); 1478 kfree(string); 1479 switch (token) { 1480 case Opt_lookupcache_all: 1481 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1482 break; 1483 case Opt_lookupcache_positive: 1484 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1485 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1486 break; 1487 case Opt_lookupcache_none: 1488 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1489 break; 1490 default: 1491 dfprintk(MOUNT, "NFS: invalid " 1492 "lookupcache argument\n"); 1493 return 0; 1494 }; 1495 break; 1496 case Opt_fscache_uniq: 1497 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1498 goto out_nomem; 1499 mnt->options |= NFS_OPTION_FSCACHE; 1500 break; 1501 case Opt_local_lock: 1502 string = match_strdup(args); 1503 if (string == NULL) 1504 goto out_nomem; 1505 token = match_token(string, nfs_local_lock_tokens, 1506 args); 1507 kfree(string); 1508 switch (token) { 1509 case Opt_local_lock_all: 1510 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1511 NFS_MOUNT_LOCAL_FCNTL); 1512 break; 1513 case Opt_local_lock_flock: 1514 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1515 break; 1516 case Opt_local_lock_posix: 1517 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1518 break; 1519 case Opt_local_lock_none: 1520 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1521 NFS_MOUNT_LOCAL_FCNTL); 1522 break; 1523 default: 1524 dfprintk(MOUNT, "NFS: invalid " 1525 "local_lock argument\n"); 1526 return 0; 1527 }; 1528 break; 1529 1530 /* 1531 * Special options 1532 */ 1533 case Opt_sloppy: 1534 sloppy = 1; 1535 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1536 break; 1537 case Opt_userspace: 1538 case Opt_deprecated: 1539 dfprintk(MOUNT, "NFS: ignoring mount option " 1540 "'%s'\n", p); 1541 break; 1542 1543 default: 1544 invalid_option = 1; 1545 dfprintk(MOUNT, "NFS: unrecognized mount option " 1546 "'%s'\n", p); 1547 } 1548 } 1549 1550 if (!sloppy && invalid_option) 1551 return 0; 1552 1553 if (mnt->minorversion && mnt->version != 4) 1554 goto out_minorversion_mismatch; 1555 1556 if (mnt->options & NFS_OPTION_MIGRATION && 1557 mnt->version != 4 && mnt->minorversion != 0) 1558 goto out_migration_misuse; 1559 1560 /* 1561 * verify that any proto=/mountproto= options match the address 1562 * families in the addr=/mountaddr= options. 1563 */ 1564 if (protofamily != AF_UNSPEC && 1565 protofamily != mnt->nfs_server.address.ss_family) 1566 goto out_proto_mismatch; 1567 1568 if (mountfamily != AF_UNSPEC) { 1569 if (mnt->mount_server.addrlen) { 1570 if (mountfamily != mnt->mount_server.address.ss_family) 1571 goto out_mountproto_mismatch; 1572 } else { 1573 if (mountfamily != mnt->nfs_server.address.ss_family) 1574 goto out_mountproto_mismatch; 1575 } 1576 } 1577 1578 return 1; 1579 1580 out_mountproto_mismatch: 1581 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1582 "option\n"); 1583 return 0; 1584 out_proto_mismatch: 1585 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1586 return 0; 1587 out_invalid_address: 1588 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1589 return 0; 1590 out_invalid_value: 1591 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1592 return 0; 1593 out_minorversion_mismatch: 1594 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1595 "minorversion=%u\n", mnt->version, mnt->minorversion); 1596 return 0; 1597 out_migration_misuse: 1598 printk(KERN_INFO 1599 "NFS: 'migration' not supported for this NFS version\n"); 1600 return 0; 1601 out_nomem: 1602 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1603 return 0; 1604 out_security_failure: 1605 free_secdata(secdata); 1606 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1607 return 0; 1608 } 1609 1610 /* 1611 * Select a security flavor for this mount. The selected flavor 1612 * is planted in args->auth_flavors[0]. 1613 * 1614 * Returns 0 on success, -EACCES on failure. 1615 */ 1616 static int nfs_select_flavor(struct nfs_parsed_mount_data *args, 1617 struct nfs_mount_request *request) 1618 { 1619 unsigned int i, count = *(request->auth_flav_len); 1620 rpc_authflavor_t flavor; 1621 1622 /* 1623 * The NFSv2 MNT operation does not return a flavor list. 1624 */ 1625 if (args->mount_server.version != NFS_MNT3_VERSION) 1626 goto out_default; 1627 1628 /* 1629 * Certain releases of Linux's mountd return an empty 1630 * flavor list in some cases. 1631 */ 1632 if (count == 0) 1633 goto out_default; 1634 1635 /* 1636 * If the sec= mount option is used, the specified flavor or AUTH_NULL 1637 * must be in the list returned by the server. 1638 * 1639 * AUTH_NULL has a special meaning when it's in the server list - it 1640 * means that the server will ignore the rpc creds, so any flavor 1641 * can be used. 1642 */ 1643 if (args->auth_flavors[0] != RPC_AUTH_MAXFLAVOR) { 1644 for (i = 0; i < count; i++) { 1645 if (args->auth_flavors[0] == request->auth_flavs[i] || 1646 request->auth_flavs[i] == RPC_AUTH_NULL) 1647 goto out; 1648 } 1649 dfprintk(MOUNT, "NFS: auth flavor %d not supported by server\n", 1650 args->auth_flavors[0]); 1651 goto out_err; 1652 } 1653 1654 /* 1655 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1656 * flavor listed first. However, some servers list 1657 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 1658 */ 1659 for (i = 0; i < count; i++) { 1660 struct rpcsec_gss_info info; 1661 1662 flavor = request->auth_flavs[i]; 1663 switch (flavor) { 1664 case RPC_AUTH_UNIX: 1665 goto out_set; 1666 case RPC_AUTH_NULL: 1667 continue; 1668 default: 1669 if (rpcauth_get_gssinfo(flavor, &info) == 0) 1670 goto out_set; 1671 } 1672 } 1673 1674 /* 1675 * As a last chance, see if the server list contains AUTH_NULL - 1676 * if it does, use the default flavor. 1677 */ 1678 for (i = 0; i < count; i++) { 1679 if (request->auth_flavs[i] == RPC_AUTH_NULL) 1680 goto out_default; 1681 } 1682 1683 dfprintk(MOUNT, "NFS: no auth flavors in common with server\n"); 1684 goto out_err; 1685 1686 out_default: 1687 /* use default if flavor not already set */ 1688 flavor = (args->auth_flavors[0] == RPC_AUTH_MAXFLAVOR) ? 1689 RPC_AUTH_UNIX : args->auth_flavors[0]; 1690 out_set: 1691 args->auth_flavors[0] = flavor; 1692 out: 1693 dfprintk(MOUNT, "NFS: using auth flavor %d\n", args->auth_flavors[0]); 1694 return 0; 1695 out_err: 1696 return -EACCES; 1697 } 1698 1699 /* 1700 * Use the remote server's MOUNT service to request the NFS file handle 1701 * corresponding to the provided path. 1702 */ 1703 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1704 struct nfs_fh *root_fh) 1705 { 1706 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1707 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1708 struct nfs_mount_request request = { 1709 .sap = (struct sockaddr *) 1710 &args->mount_server.address, 1711 .dirpath = args->nfs_server.export_path, 1712 .protocol = args->mount_server.protocol, 1713 .fh = root_fh, 1714 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1715 .auth_flav_len = &server_authlist_len, 1716 .auth_flavs = server_authlist, 1717 .net = args->net, 1718 }; 1719 int status; 1720 1721 if (args->mount_server.version == 0) { 1722 switch (args->version) { 1723 default: 1724 args->mount_server.version = NFS_MNT3_VERSION; 1725 break; 1726 case 2: 1727 args->mount_server.version = NFS_MNT_VERSION; 1728 } 1729 } 1730 request.version = args->mount_server.version; 1731 1732 if (args->mount_server.hostname) 1733 request.hostname = args->mount_server.hostname; 1734 else 1735 request.hostname = args->nfs_server.hostname; 1736 1737 /* 1738 * Construct the mount server's address. 1739 */ 1740 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1741 memcpy(request.sap, &args->nfs_server.address, 1742 args->nfs_server.addrlen); 1743 args->mount_server.addrlen = args->nfs_server.addrlen; 1744 } 1745 request.salen = args->mount_server.addrlen; 1746 nfs_set_port(request.sap, &args->mount_server.port, 0); 1747 1748 /* 1749 * Now ask the mount server to map our export path 1750 * to a file handle. 1751 */ 1752 status = nfs_mount(&request); 1753 if (status != 0) { 1754 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1755 request.hostname, status); 1756 return status; 1757 } 1758 1759 return nfs_select_flavor(args, &request); 1760 } 1761 1762 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1763 struct nfs_mount_info *mount_info, 1764 struct nfs_subversion *nfs_mod) 1765 { 1766 int status; 1767 struct nfs_server *server; 1768 1769 if (mount_info->parsed->need_mount) { 1770 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh); 1771 if (status) 1772 return ERR_PTR(status); 1773 } 1774 1775 /* Get a volume representation */ 1776 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1777 if (IS_ERR(server)) 1778 return ERR_CAST(server); 1779 1780 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1781 } 1782 EXPORT_SYMBOL_GPL(nfs_try_mount); 1783 1784 /* 1785 * Split "dev_name" into "hostname:export_path". 1786 * 1787 * The leftmost colon demarks the split between the server's hostname 1788 * and the export path. If the hostname starts with a left square 1789 * bracket, then it may contain colons. 1790 * 1791 * Note: caller frees hostname and export path, even on error. 1792 */ 1793 static int nfs_parse_devname(const char *dev_name, 1794 char **hostname, size_t maxnamlen, 1795 char **export_path, size_t maxpathlen) 1796 { 1797 size_t len; 1798 char *end; 1799 1800 /* Is the host name protected with square brakcets? */ 1801 if (*dev_name == '[') { 1802 end = strchr(++dev_name, ']'); 1803 if (end == NULL || end[1] != ':') 1804 goto out_bad_devname; 1805 1806 len = end - dev_name; 1807 end++; 1808 } else { 1809 char *comma; 1810 1811 end = strchr(dev_name, ':'); 1812 if (end == NULL) 1813 goto out_bad_devname; 1814 len = end - dev_name; 1815 1816 /* kill possible hostname list: not supported */ 1817 comma = strchr(dev_name, ','); 1818 if (comma != NULL && comma < end) 1819 *comma = 0; 1820 } 1821 1822 if (len > maxnamlen) 1823 goto out_hostname; 1824 1825 /* N.B. caller will free nfs_server.hostname in all cases */ 1826 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1827 if (*hostname == NULL) 1828 goto out_nomem; 1829 len = strlen(++end); 1830 if (len > maxpathlen) 1831 goto out_path; 1832 *export_path = kstrndup(end, len, GFP_KERNEL); 1833 if (!*export_path) 1834 goto out_nomem; 1835 1836 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1837 return 0; 1838 1839 out_bad_devname: 1840 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1841 return -EINVAL; 1842 1843 out_nomem: 1844 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1845 return -ENOMEM; 1846 1847 out_hostname: 1848 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1849 return -ENAMETOOLONG; 1850 1851 out_path: 1852 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1853 return -ENAMETOOLONG; 1854 } 1855 1856 /* 1857 * Validate the NFS2/NFS3 mount data 1858 * - fills in the mount root filehandle 1859 * 1860 * For option strings, user space handles the following behaviors: 1861 * 1862 * + DNS: mapping server host name to IP address ("addr=" option) 1863 * 1864 * + failure mode: how to behave if a mount request can't be handled 1865 * immediately ("fg/bg" option) 1866 * 1867 * + retry: how often to retry a mount request ("retry=" option) 1868 * 1869 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1870 * mountproto=tcp after mountproto=udp, and so on 1871 */ 1872 static int nfs23_validate_mount_data(void *options, 1873 struct nfs_parsed_mount_data *args, 1874 struct nfs_fh *mntfh, 1875 const char *dev_name) 1876 { 1877 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1878 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1879 1880 if (data == NULL) 1881 goto out_no_data; 1882 1883 args->version = NFS_DEFAULT_VERSION; 1884 switch (data->version) { 1885 case 1: 1886 data->namlen = 0; 1887 case 2: 1888 data->bsize = 0; 1889 case 3: 1890 if (data->flags & NFS_MOUNT_VER3) 1891 goto out_no_v3; 1892 data->root.size = NFS2_FHSIZE; 1893 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1894 case 4: 1895 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1896 goto out_no_sec; 1897 case 5: 1898 memset(data->context, 0, sizeof(data->context)); 1899 case 6: 1900 if (data->flags & NFS_MOUNT_VER3) { 1901 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1902 goto out_invalid_fh; 1903 mntfh->size = data->root.size; 1904 args->version = 3; 1905 } else { 1906 mntfh->size = NFS2_FHSIZE; 1907 args->version = 2; 1908 } 1909 1910 1911 memcpy(mntfh->data, data->root.data, mntfh->size); 1912 if (mntfh->size < sizeof(mntfh->data)) 1913 memset(mntfh->data + mntfh->size, 0, 1914 sizeof(mntfh->data) - mntfh->size); 1915 1916 /* 1917 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1918 * can deal with. 1919 */ 1920 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1921 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1922 args->rsize = data->rsize; 1923 args->wsize = data->wsize; 1924 args->timeo = data->timeo; 1925 args->retrans = data->retrans; 1926 args->acregmin = data->acregmin; 1927 args->acregmax = data->acregmax; 1928 args->acdirmin = data->acdirmin; 1929 args->acdirmax = data->acdirmax; 1930 args->need_mount = false; 1931 1932 memcpy(sap, &data->addr, sizeof(data->addr)); 1933 args->nfs_server.addrlen = sizeof(data->addr); 1934 args->nfs_server.port = ntohs(data->addr.sin_port); 1935 if (!nfs_verify_server_address(sap)) 1936 goto out_no_address; 1937 1938 if (!(data->flags & NFS_MOUNT_TCP)) 1939 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1940 /* N.B. caller will free nfs_server.hostname in all cases */ 1941 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1942 args->namlen = data->namlen; 1943 args->bsize = data->bsize; 1944 1945 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1946 args->auth_flavors[0] = data->pseudoflavor; 1947 if (!args->nfs_server.hostname) 1948 goto out_nomem; 1949 1950 if (!(data->flags & NFS_MOUNT_NONLM)) 1951 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1952 NFS_MOUNT_LOCAL_FCNTL); 1953 else 1954 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1955 NFS_MOUNT_LOCAL_FCNTL); 1956 /* 1957 * The legacy version 6 binary mount data from userspace has a 1958 * field used only to transport selinux information into the 1959 * the kernel. To continue to support that functionality we 1960 * have a touch of selinux knowledge here in the NFS code. The 1961 * userspace code converted context=blah to just blah so we are 1962 * converting back to the full string selinux understands. 1963 */ 1964 if (data->context[0]){ 1965 #ifdef CONFIG_SECURITY_SELINUX 1966 int rc; 1967 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1968 if (!opts_str) 1969 return -ENOMEM; 1970 strcpy(opts_str, "context="); 1971 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1972 strcat(opts_str, &data->context[0]); 1973 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1974 kfree(opts_str); 1975 if (rc) 1976 return rc; 1977 #else 1978 return -EINVAL; 1979 #endif 1980 } 1981 1982 break; 1983 default: 1984 return NFS_TEXT_DATA; 1985 } 1986 1987 #if !IS_ENABLED(CONFIG_NFS_V3) 1988 if (args->version == 3) 1989 goto out_v3_not_compiled; 1990 #endif /* !CONFIG_NFS_V3 */ 1991 1992 return 0; 1993 1994 out_no_data: 1995 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 1996 return -EINVAL; 1997 1998 out_no_v3: 1999 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2000 data->version); 2001 return -EINVAL; 2002 2003 out_no_sec: 2004 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2005 return -EINVAL; 2006 2007 #if !IS_ENABLED(CONFIG_NFS_V3) 2008 out_v3_not_compiled: 2009 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 2010 return -EPROTONOSUPPORT; 2011 #endif /* !CONFIG_NFS_V3 */ 2012 2013 out_nomem: 2014 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2015 return -ENOMEM; 2016 2017 out_no_address: 2018 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2019 return -EINVAL; 2020 2021 out_invalid_fh: 2022 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2023 return -EINVAL; 2024 } 2025 2026 #if IS_ENABLED(CONFIG_NFS_V4) 2027 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2028 void *options, 2029 struct nfs_parsed_mount_data *args, 2030 struct nfs_fh *mntfh, 2031 const char *dev_name) 2032 { 2033 if (fs_type == &nfs_fs_type) 2034 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2035 return nfs4_validate_mount_data(options, args, dev_name); 2036 } 2037 #else 2038 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2039 void *options, 2040 struct nfs_parsed_mount_data *args, 2041 struct nfs_fh *mntfh, 2042 const char *dev_name) 2043 { 2044 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2045 } 2046 #endif 2047 2048 static int nfs_validate_text_mount_data(void *options, 2049 struct nfs_parsed_mount_data *args, 2050 const char *dev_name) 2051 { 2052 int port = 0; 2053 int max_namelen = PAGE_SIZE; 2054 int max_pathlen = NFS_MAXPATHLEN; 2055 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2056 2057 if (nfs_parse_mount_options((char *)options, args) == 0) 2058 return -EINVAL; 2059 2060 if (!nfs_verify_server_address(sap)) 2061 goto out_no_address; 2062 2063 if (args->version == 4) { 2064 #if IS_ENABLED(CONFIG_NFS_V4) 2065 port = NFS_PORT; 2066 max_namelen = NFS4_MAXNAMLEN; 2067 max_pathlen = NFS4_MAXPATHLEN; 2068 nfs_validate_transport_protocol(args); 2069 nfs4_validate_mount_flags(args); 2070 #else 2071 goto out_v4_not_compiled; 2072 #endif /* CONFIG_NFS_V4 */ 2073 } else 2074 nfs_set_mount_transport_protocol(args); 2075 2076 nfs_set_port(sap, &args->nfs_server.port, port); 2077 2078 if (args->auth_flavor_len > 1) 2079 goto out_bad_auth; 2080 2081 return nfs_parse_devname(dev_name, 2082 &args->nfs_server.hostname, 2083 max_namelen, 2084 &args->nfs_server.export_path, 2085 max_pathlen); 2086 2087 #if !IS_ENABLED(CONFIG_NFS_V4) 2088 out_v4_not_compiled: 2089 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2090 return -EPROTONOSUPPORT; 2091 #endif /* !CONFIG_NFS_V4 */ 2092 2093 out_no_address: 2094 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2095 return -EINVAL; 2096 2097 out_bad_auth: 2098 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n"); 2099 return -EINVAL; 2100 } 2101 2102 static int 2103 nfs_compare_remount_data(struct nfs_server *nfss, 2104 struct nfs_parsed_mount_data *data) 2105 { 2106 if (data->flags != nfss->flags || 2107 data->rsize != nfss->rsize || 2108 data->wsize != nfss->wsize || 2109 data->retrans != nfss->client->cl_timeout->to_retries || 2110 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2111 data->acregmin != nfss->acregmin / HZ || 2112 data->acregmax != nfss->acregmax / HZ || 2113 data->acdirmin != nfss->acdirmin / HZ || 2114 data->acdirmax != nfss->acdirmax / HZ || 2115 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2116 data->nfs_server.port != nfss->port || 2117 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2118 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2119 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2120 return -EINVAL; 2121 2122 return 0; 2123 } 2124 2125 int 2126 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2127 { 2128 int error; 2129 struct nfs_server *nfss = sb->s_fs_info; 2130 struct nfs_parsed_mount_data *data; 2131 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2132 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2133 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2134 2135 /* 2136 * Userspace mount programs that send binary options generally send 2137 * them populated with default values. We have no way to know which 2138 * ones were explicitly specified. Fall back to legacy behavior and 2139 * just return success. 2140 */ 2141 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2142 (nfsvers <= 3 && (!options || (options->version >= 1 && 2143 options->version <= 6)))) 2144 return 0; 2145 2146 data = kzalloc(sizeof(*data), GFP_KERNEL); 2147 if (data == NULL) 2148 return -ENOMEM; 2149 2150 /* fill out struct with values from existing mount */ 2151 data->flags = nfss->flags; 2152 data->rsize = nfss->rsize; 2153 data->wsize = nfss->wsize; 2154 data->retrans = nfss->client->cl_timeout->to_retries; 2155 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2156 data->acregmin = nfss->acregmin / HZ; 2157 data->acregmax = nfss->acregmax / HZ; 2158 data->acdirmin = nfss->acdirmin / HZ; 2159 data->acdirmax = nfss->acdirmax / HZ; 2160 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2161 data->nfs_server.port = nfss->port; 2162 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2163 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2164 data->nfs_server.addrlen); 2165 2166 /* overwrite those values with any that were specified */ 2167 error = nfs_parse_mount_options((char *)options, data); 2168 if (error < 0) 2169 goto out; 2170 2171 /* 2172 * noac is a special case. It implies -o sync, but that's not 2173 * necessarily reflected in the mtab options. do_remount_sb 2174 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2175 * remount options, so we have to explicitly reset it. 2176 */ 2177 if (data->flags & NFS_MOUNT_NOAC) 2178 *flags |= MS_SYNCHRONOUS; 2179 2180 /* compare new mount options with old ones */ 2181 error = nfs_compare_remount_data(nfss, data); 2182 out: 2183 kfree(data); 2184 return error; 2185 } 2186 EXPORT_SYMBOL_GPL(nfs_remount); 2187 2188 /* 2189 * Initialise the common bits of the superblock 2190 */ 2191 inline void nfs_initialise_sb(struct super_block *sb) 2192 { 2193 struct nfs_server *server = NFS_SB(sb); 2194 2195 sb->s_magic = NFS_SUPER_MAGIC; 2196 2197 /* We probably want something more informative here */ 2198 snprintf(sb->s_id, sizeof(sb->s_id), 2199 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2200 2201 if (sb->s_blocksize == 0) 2202 sb->s_blocksize = nfs_block_bits(server->wsize, 2203 &sb->s_blocksize_bits); 2204 2205 sb->s_bdi = &server->backing_dev_info; 2206 2207 nfs_super_set_maxbytes(sb, server->maxfilesize); 2208 } 2209 2210 /* 2211 * Finish setting up an NFS2/3 superblock 2212 */ 2213 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2214 { 2215 struct nfs_parsed_mount_data *data = mount_info->parsed; 2216 struct nfs_server *server = NFS_SB(sb); 2217 2218 sb->s_blocksize_bits = 0; 2219 sb->s_blocksize = 0; 2220 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2221 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2222 if (data && data->bsize) 2223 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2224 2225 if (server->nfs_client->rpc_ops->version != 2) { 2226 /* The VFS shouldn't apply the umask to mode bits. We will do 2227 * so ourselves when necessary. 2228 */ 2229 sb->s_flags |= MS_POSIXACL; 2230 sb->s_time_gran = 1; 2231 } 2232 2233 nfs_initialise_sb(sb); 2234 } 2235 EXPORT_SYMBOL_GPL(nfs_fill_super); 2236 2237 /* 2238 * Finish setting up a cloned NFS2/3/4 superblock 2239 */ 2240 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2241 { 2242 const struct super_block *old_sb = mount_info->cloned->sb; 2243 struct nfs_server *server = NFS_SB(sb); 2244 2245 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2246 sb->s_blocksize = old_sb->s_blocksize; 2247 sb->s_maxbytes = old_sb->s_maxbytes; 2248 sb->s_xattr = old_sb->s_xattr; 2249 sb->s_op = old_sb->s_op; 2250 sb->s_time_gran = 1; 2251 2252 if (server->nfs_client->rpc_ops->version != 2) { 2253 /* The VFS shouldn't apply the umask to mode bits. We will do 2254 * so ourselves when necessary. 2255 */ 2256 sb->s_flags |= MS_POSIXACL; 2257 } 2258 2259 nfs_initialise_sb(sb); 2260 } 2261 2262 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2263 { 2264 const struct nfs_server *a = s->s_fs_info; 2265 const struct rpc_clnt *clnt_a = a->client; 2266 const struct rpc_clnt *clnt_b = b->client; 2267 2268 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2269 goto Ebusy; 2270 if (a->nfs_client != b->nfs_client) 2271 goto Ebusy; 2272 if (a->flags != b->flags) 2273 goto Ebusy; 2274 if (a->wsize != b->wsize) 2275 goto Ebusy; 2276 if (a->rsize != b->rsize) 2277 goto Ebusy; 2278 if (a->acregmin != b->acregmin) 2279 goto Ebusy; 2280 if (a->acregmax != b->acregmax) 2281 goto Ebusy; 2282 if (a->acdirmin != b->acdirmin) 2283 goto Ebusy; 2284 if (a->acdirmax != b->acdirmax) 2285 goto Ebusy; 2286 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2287 goto Ebusy; 2288 return 1; 2289 Ebusy: 2290 return 0; 2291 } 2292 2293 struct nfs_sb_mountdata { 2294 struct nfs_server *server; 2295 int mntflags; 2296 }; 2297 2298 static int nfs_set_super(struct super_block *s, void *data) 2299 { 2300 struct nfs_sb_mountdata *sb_mntdata = data; 2301 struct nfs_server *server = sb_mntdata->server; 2302 int ret; 2303 2304 s->s_flags = sb_mntdata->mntflags; 2305 s->s_fs_info = server; 2306 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2307 ret = set_anon_super(s, server); 2308 if (ret == 0) 2309 server->s_dev = s->s_dev; 2310 return ret; 2311 } 2312 2313 static int nfs_compare_super_address(struct nfs_server *server1, 2314 struct nfs_server *server2) 2315 { 2316 struct sockaddr *sap1, *sap2; 2317 2318 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2319 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2320 2321 if (sap1->sa_family != sap2->sa_family) 2322 return 0; 2323 2324 switch (sap1->sa_family) { 2325 case AF_INET: { 2326 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2327 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2328 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2329 return 0; 2330 if (sin1->sin_port != sin2->sin_port) 2331 return 0; 2332 break; 2333 } 2334 case AF_INET6: { 2335 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2336 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2337 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2338 return 0; 2339 if (sin1->sin6_port != sin2->sin6_port) 2340 return 0; 2341 break; 2342 } 2343 default: 2344 return 0; 2345 } 2346 2347 return 1; 2348 } 2349 2350 static int nfs_compare_super(struct super_block *sb, void *data) 2351 { 2352 struct nfs_sb_mountdata *sb_mntdata = data; 2353 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2354 int mntflags = sb_mntdata->mntflags; 2355 2356 if (!nfs_compare_super_address(old, server)) 2357 return 0; 2358 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2359 if (old->flags & NFS_MOUNT_UNSHARED) 2360 return 0; 2361 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2362 return 0; 2363 return nfs_compare_mount_options(sb, server, mntflags); 2364 } 2365 2366 #ifdef CONFIG_NFS_FSCACHE 2367 static void nfs_get_cache_cookie(struct super_block *sb, 2368 struct nfs_parsed_mount_data *parsed, 2369 struct nfs_clone_mount *cloned) 2370 { 2371 struct nfs_server *nfss = NFS_SB(sb); 2372 char *uniq = NULL; 2373 int ulen = 0; 2374 2375 nfss->fscache_key = NULL; 2376 nfss->fscache = NULL; 2377 2378 if (parsed) { 2379 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2380 return; 2381 if (parsed->fscache_uniq) { 2382 uniq = parsed->fscache_uniq; 2383 ulen = strlen(parsed->fscache_uniq); 2384 } 2385 } else if (cloned) { 2386 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2387 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2388 return; 2389 if (mnt_s->fscache_key) { 2390 uniq = mnt_s->fscache_key->key.uniquifier; 2391 ulen = mnt_s->fscache_key->key.uniq_len; 2392 }; 2393 } else 2394 return; 2395 2396 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2397 } 2398 #else 2399 static void nfs_get_cache_cookie(struct super_block *sb, 2400 struct nfs_parsed_mount_data *parsed, 2401 struct nfs_clone_mount *cloned) 2402 { 2403 } 2404 #endif 2405 2406 static int nfs_bdi_register(struct nfs_server *server) 2407 { 2408 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2409 } 2410 2411 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2412 struct nfs_mount_info *mount_info) 2413 { 2414 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts); 2415 } 2416 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2417 2418 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2419 struct nfs_mount_info *mount_info) 2420 { 2421 /* clone any lsm security options from the parent to the new sb */ 2422 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2423 return -ESTALE; 2424 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2425 } 2426 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2427 2428 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2429 int flags, const char *dev_name, 2430 struct nfs_mount_info *mount_info, 2431 struct nfs_subversion *nfs_mod) 2432 { 2433 struct super_block *s; 2434 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2435 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2436 struct nfs_sb_mountdata sb_mntdata = { 2437 .mntflags = flags, 2438 .server = server, 2439 }; 2440 int error; 2441 2442 if (server->flags & NFS_MOUNT_UNSHARED) 2443 compare_super = NULL; 2444 2445 /* -o noac implies -o sync */ 2446 if (server->flags & NFS_MOUNT_NOAC) 2447 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2448 2449 /* Get a superblock - note that we may end up sharing one that already exists */ 2450 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2451 if (IS_ERR(s)) { 2452 mntroot = ERR_CAST(s); 2453 goto out_err_nosb; 2454 } 2455 2456 if (s->s_fs_info != server) { 2457 nfs_free_server(server); 2458 server = NULL; 2459 } else { 2460 error = nfs_bdi_register(server); 2461 if (error) { 2462 mntroot = ERR_PTR(error); 2463 goto error_splat_bdi; 2464 } 2465 } 2466 2467 if (!s->s_root) { 2468 /* initial superblock/root creation */ 2469 mount_info->fill_super(s, mount_info); 2470 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2471 } 2472 2473 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2474 if (IS_ERR(mntroot)) 2475 goto error_splat_super; 2476 2477 error = mount_info->set_security(s, mntroot, mount_info); 2478 if (error) 2479 goto error_splat_root; 2480 2481 s->s_flags |= MS_ACTIVE; 2482 2483 out: 2484 return mntroot; 2485 2486 out_err_nosb: 2487 nfs_free_server(server); 2488 goto out; 2489 2490 error_splat_root: 2491 dput(mntroot); 2492 mntroot = ERR_PTR(error); 2493 error_splat_super: 2494 if (server && !s->s_root) 2495 bdi_unregister(&server->backing_dev_info); 2496 error_splat_bdi: 2497 deactivate_locked_super(s); 2498 goto out; 2499 } 2500 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2501 2502 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2503 int flags, const char *dev_name, void *raw_data) 2504 { 2505 struct nfs_mount_info mount_info = { 2506 .fill_super = nfs_fill_super, 2507 .set_security = nfs_set_sb_security, 2508 }; 2509 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2510 struct nfs_subversion *nfs_mod; 2511 int error; 2512 2513 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2514 mount_info.mntfh = nfs_alloc_fhandle(); 2515 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2516 goto out; 2517 2518 /* Validate the mount data */ 2519 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2520 if (error == NFS_TEXT_DATA) 2521 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2522 if (error < 0) { 2523 mntroot = ERR_PTR(error); 2524 goto out; 2525 } 2526 2527 nfs_mod = get_nfs_version(mount_info.parsed->version); 2528 if (IS_ERR(nfs_mod)) { 2529 mntroot = ERR_CAST(nfs_mod); 2530 goto out; 2531 } 2532 2533 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2534 2535 put_nfs_version(nfs_mod); 2536 out: 2537 nfs_free_parsed_mount_data(mount_info.parsed); 2538 nfs_free_fhandle(mount_info.mntfh); 2539 return mntroot; 2540 } 2541 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2542 2543 /* 2544 * Ensure that we unregister the bdi before kill_anon_super 2545 * releases the device name 2546 */ 2547 void nfs_put_super(struct super_block *s) 2548 { 2549 struct nfs_server *server = NFS_SB(s); 2550 2551 bdi_unregister(&server->backing_dev_info); 2552 } 2553 EXPORT_SYMBOL_GPL(nfs_put_super); 2554 2555 /* 2556 * Destroy an NFS2/3 superblock 2557 */ 2558 void nfs_kill_super(struct super_block *s) 2559 { 2560 struct nfs_server *server = NFS_SB(s); 2561 2562 kill_anon_super(s); 2563 nfs_fscache_release_super_cookie(s); 2564 nfs_free_server(server); 2565 } 2566 EXPORT_SYMBOL_GPL(nfs_kill_super); 2567 2568 /* 2569 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2570 */ 2571 static struct dentry * 2572 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2573 const char *dev_name, void *raw_data) 2574 { 2575 struct nfs_clone_mount *data = raw_data; 2576 struct nfs_mount_info mount_info = { 2577 .fill_super = nfs_clone_super, 2578 .set_security = nfs_clone_sb_security, 2579 .cloned = data, 2580 }; 2581 struct nfs_server *server; 2582 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2583 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2584 2585 dprintk("--> nfs_xdev_mount()\n"); 2586 2587 mount_info.mntfh = mount_info.cloned->fh; 2588 2589 /* create a new volume representation */ 2590 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2591 2592 if (IS_ERR(server)) 2593 mntroot = ERR_CAST(server); 2594 else 2595 mntroot = nfs_fs_mount_common(server, flags, 2596 dev_name, &mount_info, nfs_mod); 2597 2598 dprintk("<-- nfs_xdev_mount() = %ld\n", 2599 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2600 return mntroot; 2601 } 2602 2603 #if IS_ENABLED(CONFIG_NFS_V4) 2604 2605 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2606 { 2607 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2608 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2609 } 2610 2611 /* 2612 * Validate NFSv4 mount options 2613 */ 2614 static int nfs4_validate_mount_data(void *options, 2615 struct nfs_parsed_mount_data *args, 2616 const char *dev_name) 2617 { 2618 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2619 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2620 char *c; 2621 2622 if (data == NULL) 2623 goto out_no_data; 2624 2625 args->version = 4; 2626 2627 switch (data->version) { 2628 case 1: 2629 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2630 goto out_no_address; 2631 if (data->host_addrlen == 0) 2632 goto out_no_address; 2633 args->nfs_server.addrlen = data->host_addrlen; 2634 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2635 return -EFAULT; 2636 if (!nfs_verify_server_address(sap)) 2637 goto out_no_address; 2638 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2639 2640 if (data->auth_flavourlen) { 2641 if (data->auth_flavourlen > 1) 2642 goto out_inval_auth; 2643 if (copy_from_user(&args->auth_flavors[0], 2644 data->auth_flavours, 2645 sizeof(args->auth_flavors[0]))) 2646 return -EFAULT; 2647 } 2648 2649 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2650 if (IS_ERR(c)) 2651 return PTR_ERR(c); 2652 args->nfs_server.hostname = c; 2653 2654 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2655 if (IS_ERR(c)) 2656 return PTR_ERR(c); 2657 args->nfs_server.export_path = c; 2658 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2659 2660 c = strndup_user(data->client_addr.data, 16); 2661 if (IS_ERR(c)) 2662 return PTR_ERR(c); 2663 args->client_address = c; 2664 2665 /* 2666 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2667 * can deal with. 2668 */ 2669 2670 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2671 args->rsize = data->rsize; 2672 args->wsize = data->wsize; 2673 args->timeo = data->timeo; 2674 args->retrans = data->retrans; 2675 args->acregmin = data->acregmin; 2676 args->acregmax = data->acregmax; 2677 args->acdirmin = data->acdirmin; 2678 args->acdirmax = data->acdirmax; 2679 args->nfs_server.protocol = data->proto; 2680 nfs_validate_transport_protocol(args); 2681 2682 break; 2683 default: 2684 return NFS_TEXT_DATA; 2685 } 2686 2687 return 0; 2688 2689 out_no_data: 2690 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2691 return -EINVAL; 2692 2693 out_inval_auth: 2694 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2695 data->auth_flavourlen); 2696 return -EINVAL; 2697 2698 out_no_address: 2699 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2700 return -EINVAL; 2701 } 2702 2703 /* 2704 * NFS v4 module parameters need to stay in the 2705 * NFS client for backwards compatibility 2706 */ 2707 unsigned int nfs_callback_set_tcpport; 2708 unsigned short nfs_callback_tcpport; 2709 /* Default cache timeout is 10 minutes */ 2710 unsigned int nfs_idmap_cache_timeout = 600; 2711 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2712 bool nfs4_disable_idmapping = true; 2713 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2714 unsigned short send_implementation_id = 1; 2715 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2716 2717 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2718 EXPORT_SYMBOL_GPL(nfs_callback_tcpport); 2719 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2720 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2721 EXPORT_SYMBOL_GPL(max_session_slots); 2722 EXPORT_SYMBOL_GPL(send_implementation_id); 2723 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2724 2725 #define NFS_CALLBACK_MAXPORTNR (65535U) 2726 2727 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2728 { 2729 unsigned long num; 2730 int ret; 2731 2732 if (!val) 2733 return -EINVAL; 2734 ret = kstrtoul(val, 0, &num); 2735 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2736 return -EINVAL; 2737 *((unsigned int *)kp->arg) = num; 2738 return 0; 2739 } 2740 static struct kernel_param_ops param_ops_portnr = { 2741 .set = param_set_portnr, 2742 .get = param_get_uint, 2743 }; 2744 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2745 2746 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2747 module_param(nfs_idmap_cache_timeout, int, 0644); 2748 module_param(nfs4_disable_idmapping, bool, 0644); 2749 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2750 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2751 MODULE_PARM_DESC(nfs4_disable_idmapping, 2752 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2753 module_param(max_session_slots, ushort, 0644); 2754 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2755 "requests the client will negotiate"); 2756 module_param(send_implementation_id, ushort, 0644); 2757 MODULE_PARM_DESC(send_implementation_id, 2758 "Send implementation ID with NFSv4.1 exchange_id"); 2759 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2760 2761 #endif /* CONFIG_NFS_V4 */ 2762