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/vfs.h> 47 #include <linux/inet.h> 48 #include <linux/in6.h> 49 #include <linux/slab.h> 50 #include <net/ipv6.h> 51 #include <linux/netdevice.h> 52 #include <linux/nfs_xdr.h> 53 #include <linux/magic.h> 54 #include <linux/parser.h> 55 #include <linux/nsproxy.h> 56 #include <linux/rcupdate.h> 57 58 #include <asm/uaccess.h> 59 60 #include "nfs4_fs.h" 61 #include "callback.h" 62 #include "delegation.h" 63 #include "iostat.h" 64 #include "internal.h" 65 #include "fscache.h" 66 #include "nfs4session.h" 67 #include "pnfs.h" 68 #include "nfs.h" 69 70 #define NFSDBG_FACILITY NFSDBG_VFS 71 #define NFS_TEXT_DATA 1 72 73 #if IS_ENABLED(CONFIG_NFS_V3) 74 #define NFS_DEFAULT_VERSION 3 75 #else 76 #define NFS_DEFAULT_VERSION 2 77 #endif 78 79 enum { 80 /* Mount options that take no arguments */ 81 Opt_soft, Opt_hard, 82 Opt_posix, Opt_noposix, 83 Opt_cto, Opt_nocto, 84 Opt_ac, Opt_noac, 85 Opt_lock, Opt_nolock, 86 Opt_udp, Opt_tcp, Opt_rdma, 87 Opt_acl, Opt_noacl, 88 Opt_rdirplus, Opt_nordirplus, 89 Opt_sharecache, Opt_nosharecache, 90 Opt_resvport, Opt_noresvport, 91 Opt_fscache, Opt_nofscache, 92 Opt_migration, Opt_nomigration, 93 94 /* Mount options that take integer arguments */ 95 Opt_port, 96 Opt_rsize, Opt_wsize, Opt_bsize, 97 Opt_timeo, Opt_retrans, 98 Opt_acregmin, Opt_acregmax, 99 Opt_acdirmin, Opt_acdirmax, 100 Opt_actimeo, 101 Opt_namelen, 102 Opt_mountport, 103 Opt_mountvers, 104 Opt_minorversion, 105 106 /* Mount options that take string arguments */ 107 Opt_nfsvers, 108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 109 Opt_addr, Opt_mountaddr, Opt_clientaddr, 110 Opt_lookupcache, 111 Opt_fscache_uniq, 112 Opt_local_lock, 113 114 /* Special mount options */ 115 Opt_userspace, Opt_deprecated, Opt_sloppy, 116 117 Opt_err 118 }; 119 120 static const match_table_t nfs_mount_option_tokens = { 121 { Opt_userspace, "bg" }, 122 { Opt_userspace, "fg" }, 123 { Opt_userspace, "retry=%s" }, 124 125 { Opt_sloppy, "sloppy" }, 126 127 { Opt_soft, "soft" }, 128 { Opt_hard, "hard" }, 129 { Opt_deprecated, "intr" }, 130 { Opt_deprecated, "nointr" }, 131 { Opt_posix, "posix" }, 132 { Opt_noposix, "noposix" }, 133 { Opt_cto, "cto" }, 134 { Opt_nocto, "nocto" }, 135 { Opt_ac, "ac" }, 136 { Opt_noac, "noac" }, 137 { Opt_lock, "lock" }, 138 { Opt_nolock, "nolock" }, 139 { Opt_udp, "udp" }, 140 { Opt_tcp, "tcp" }, 141 { Opt_rdma, "rdma" }, 142 { Opt_acl, "acl" }, 143 { Opt_noacl, "noacl" }, 144 { Opt_rdirplus, "rdirplus" }, 145 { Opt_nordirplus, "nordirplus" }, 146 { Opt_sharecache, "sharecache" }, 147 { Opt_nosharecache, "nosharecache" }, 148 { Opt_resvport, "resvport" }, 149 { Opt_noresvport, "noresvport" }, 150 { Opt_fscache, "fsc" }, 151 { Opt_nofscache, "nofsc" }, 152 { Opt_migration, "migration" }, 153 { Opt_nomigration, "nomigration" }, 154 155 { Opt_port, "port=%s" }, 156 { Opt_rsize, "rsize=%s" }, 157 { Opt_wsize, "wsize=%s" }, 158 { Opt_bsize, "bsize=%s" }, 159 { Opt_timeo, "timeo=%s" }, 160 { Opt_retrans, "retrans=%s" }, 161 { Opt_acregmin, "acregmin=%s" }, 162 { Opt_acregmax, "acregmax=%s" }, 163 { Opt_acdirmin, "acdirmin=%s" }, 164 { Opt_acdirmax, "acdirmax=%s" }, 165 { Opt_actimeo, "actimeo=%s" }, 166 { Opt_namelen, "namlen=%s" }, 167 { Opt_mountport, "mountport=%s" }, 168 { Opt_mountvers, "mountvers=%s" }, 169 { Opt_minorversion, "minorversion=%s" }, 170 171 { Opt_nfsvers, "nfsvers=%s" }, 172 { Opt_nfsvers, "vers=%s" }, 173 174 { Opt_sec, "sec=%s" }, 175 { Opt_proto, "proto=%s" }, 176 { Opt_mountproto, "mountproto=%s" }, 177 { Opt_addr, "addr=%s" }, 178 { Opt_clientaddr, "clientaddr=%s" }, 179 { Opt_mounthost, "mounthost=%s" }, 180 { Opt_mountaddr, "mountaddr=%s" }, 181 182 { Opt_lookupcache, "lookupcache=%s" }, 183 { Opt_fscache_uniq, "fsc=%s" }, 184 { Opt_local_lock, "local_lock=%s" }, 185 186 /* The following needs to be listed after all other options */ 187 { Opt_nfsvers, "v%s" }, 188 189 { Opt_err, NULL } 190 }; 191 192 enum { 193 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 194 Opt_xprt_rdma6, 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 { Opt_xprt_rdma6, "rdma6" }, 206 207 { Opt_xprt_err, NULL } 208 }; 209 210 enum { 211 Opt_sec_none, Opt_sec_sys, 212 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 213 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 214 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 215 216 Opt_sec_err 217 }; 218 219 static const match_table_t nfs_secflavor_tokens = { 220 { Opt_sec_none, "none" }, 221 { Opt_sec_none, "null" }, 222 { Opt_sec_sys, "sys" }, 223 224 { Opt_sec_krb5, "krb5" }, 225 { Opt_sec_krb5i, "krb5i" }, 226 { Opt_sec_krb5p, "krb5p" }, 227 228 { Opt_sec_lkey, "lkey" }, 229 { Opt_sec_lkeyi, "lkeyi" }, 230 { Opt_sec_lkeyp, "lkeyp" }, 231 232 { Opt_sec_spkm, "spkm3" }, 233 { Opt_sec_spkmi, "spkm3i" }, 234 { Opt_sec_spkmp, "spkm3p" }, 235 236 { Opt_sec_err, NULL } 237 }; 238 239 enum { 240 Opt_lookupcache_all, Opt_lookupcache_positive, 241 Opt_lookupcache_none, 242 243 Opt_lookupcache_err 244 }; 245 246 static match_table_t nfs_lookupcache_tokens = { 247 { Opt_lookupcache_all, "all" }, 248 { Opt_lookupcache_positive, "pos" }, 249 { Opt_lookupcache_positive, "positive" }, 250 { Opt_lookupcache_none, "none" }, 251 252 { Opt_lookupcache_err, NULL } 253 }; 254 255 enum { 256 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 257 Opt_local_lock_none, 258 259 Opt_local_lock_err 260 }; 261 262 static match_table_t nfs_local_lock_tokens = { 263 { Opt_local_lock_all, "all" }, 264 { Opt_local_lock_flock, "flock" }, 265 { Opt_local_lock_posix, "posix" }, 266 { Opt_local_lock_none, "none" }, 267 268 { Opt_local_lock_err, NULL } 269 }; 270 271 enum { 272 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 273 Opt_vers_4_1, Opt_vers_4_2, 274 275 Opt_vers_err 276 }; 277 278 static match_table_t nfs_vers_tokens = { 279 { Opt_vers_2, "2" }, 280 { Opt_vers_3, "3" }, 281 { Opt_vers_4, "4" }, 282 { Opt_vers_4_0, "4.0" }, 283 { Opt_vers_4_1, "4.1" }, 284 { Opt_vers_4_2, "4.2" }, 285 286 { Opt_vers_err, NULL } 287 }; 288 289 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 290 int flags, const char *dev_name, void *raw_data); 291 292 struct file_system_type nfs_fs_type = { 293 .owner = THIS_MODULE, 294 .name = "nfs", 295 .mount = nfs_fs_mount, 296 .kill_sb = nfs_kill_super, 297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 298 }; 299 MODULE_ALIAS_FS("nfs"); 300 EXPORT_SYMBOL_GPL(nfs_fs_type); 301 302 struct file_system_type nfs_xdev_fs_type = { 303 .owner = THIS_MODULE, 304 .name = "nfs", 305 .mount = nfs_xdev_mount, 306 .kill_sb = nfs_kill_super, 307 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 308 }; 309 310 const struct super_operations nfs_sops = { 311 .alloc_inode = nfs_alloc_inode, 312 .destroy_inode = nfs_destroy_inode, 313 .write_inode = nfs_write_inode, 314 .drop_inode = nfs_drop_inode, 315 .statfs = nfs_statfs, 316 .evict_inode = nfs_evict_inode, 317 .umount_begin = nfs_umount_begin, 318 .show_options = nfs_show_options, 319 .show_devname = nfs_show_devname, 320 .show_path = nfs_show_path, 321 .show_stats = nfs_show_stats, 322 .remount_fs = nfs_remount, 323 }; 324 EXPORT_SYMBOL_GPL(nfs_sops); 325 326 #if IS_ENABLED(CONFIG_NFS_V4) 327 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 328 static int nfs4_validate_mount_data(void *options, 329 struct nfs_parsed_mount_data *args, const char *dev_name); 330 331 struct file_system_type nfs4_fs_type = { 332 .owner = THIS_MODULE, 333 .name = "nfs4", 334 .mount = nfs_fs_mount, 335 .kill_sb = nfs_kill_super, 336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 337 }; 338 MODULE_ALIAS_FS("nfs4"); 339 MODULE_ALIAS("nfs4"); 340 EXPORT_SYMBOL_GPL(nfs4_fs_type); 341 342 static int __init register_nfs4_fs(void) 343 { 344 return register_filesystem(&nfs4_fs_type); 345 } 346 347 static void unregister_nfs4_fs(void) 348 { 349 unregister_filesystem(&nfs4_fs_type); 350 } 351 #else 352 static int __init register_nfs4_fs(void) 353 { 354 return 0; 355 } 356 357 static void unregister_nfs4_fs(void) 358 { 359 } 360 #endif 361 362 static struct shrinker acl_shrinker = { 363 .count_objects = nfs_access_cache_count, 364 .scan_objects = nfs_access_cache_scan, 365 .seeks = DEFAULT_SEEKS, 366 }; 367 368 /* 369 * Register the NFS filesystems 370 */ 371 int __init register_nfs_fs(void) 372 { 373 int ret; 374 375 ret = register_filesystem(&nfs_fs_type); 376 if (ret < 0) 377 goto error_0; 378 379 ret = register_nfs4_fs(); 380 if (ret < 0) 381 goto error_1; 382 383 ret = nfs_register_sysctl(); 384 if (ret < 0) 385 goto error_2; 386 ret = register_shrinker(&acl_shrinker); 387 if (ret < 0) 388 goto error_3; 389 return 0; 390 error_3: 391 nfs_unregister_sysctl(); 392 error_2: 393 unregister_nfs4_fs(); 394 error_1: 395 unregister_filesystem(&nfs_fs_type); 396 error_0: 397 return ret; 398 } 399 400 /* 401 * Unregister the NFS filesystems 402 */ 403 void __exit unregister_nfs_fs(void) 404 { 405 unregister_shrinker(&acl_shrinker); 406 nfs_unregister_sysctl(); 407 unregister_nfs4_fs(); 408 unregister_filesystem(&nfs_fs_type); 409 } 410 411 bool nfs_sb_active(struct super_block *sb) 412 { 413 struct nfs_server *server = NFS_SB(sb); 414 415 if (!atomic_inc_not_zero(&sb->s_active)) 416 return false; 417 if (atomic_inc_return(&server->active) != 1) 418 atomic_dec(&sb->s_active); 419 return true; 420 } 421 EXPORT_SYMBOL_GPL(nfs_sb_active); 422 423 void nfs_sb_deactive(struct super_block *sb) 424 { 425 struct nfs_server *server = NFS_SB(sb); 426 427 if (atomic_dec_and_test(&server->active)) 428 deactivate_super(sb); 429 } 430 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 431 432 /* 433 * Deliver file system statistics to userspace 434 */ 435 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 436 { 437 struct nfs_server *server = NFS_SB(dentry->d_sb); 438 unsigned char blockbits; 439 unsigned long blockres; 440 struct nfs_fh *fh = NFS_FH(d_inode(dentry)); 441 struct nfs_fsstat res; 442 int error = -ENOMEM; 443 444 res.fattr = nfs_alloc_fattr(); 445 if (res.fattr == NULL) 446 goto out_err; 447 448 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 449 if (unlikely(error == -ESTALE)) { 450 struct dentry *pd_dentry; 451 452 pd_dentry = dget_parent(dentry); 453 if (pd_dentry != NULL) { 454 nfs_zap_caches(d_inode(pd_dentry)); 455 dput(pd_dentry); 456 } 457 } 458 nfs_free_fattr(res.fattr); 459 if (error < 0) 460 goto out_err; 461 462 buf->f_type = NFS_SUPER_MAGIC; 463 464 /* 465 * Current versions of glibc do not correctly handle the 466 * case where f_frsize != f_bsize. Eventually we want to 467 * report the value of wtmult in this field. 468 */ 469 buf->f_frsize = dentry->d_sb->s_blocksize; 470 471 /* 472 * On most *nix systems, f_blocks, f_bfree, and f_bavail 473 * are reported in units of f_frsize. Linux hasn't had 474 * an f_frsize field in its statfs struct until recently, 475 * thus historically Linux's sys_statfs reports these 476 * fields in units of f_bsize. 477 */ 478 buf->f_bsize = dentry->d_sb->s_blocksize; 479 blockbits = dentry->d_sb->s_blocksize_bits; 480 blockres = (1 << blockbits) - 1; 481 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 482 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 483 buf->f_bavail = (res.abytes + blockres) >> blockbits; 484 485 buf->f_files = res.tfiles; 486 buf->f_ffree = res.afiles; 487 488 buf->f_namelen = server->namelen; 489 490 return 0; 491 492 out_err: 493 dprintk("%s: statfs error = %d\n", __func__, -error); 494 return error; 495 } 496 EXPORT_SYMBOL_GPL(nfs_statfs); 497 498 /* 499 * Map the security flavour number to a name 500 */ 501 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 502 { 503 static const struct { 504 rpc_authflavor_t flavour; 505 const char *str; 506 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { 507 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ 508 { RPC_AUTH_NULL, "null" }, 509 { RPC_AUTH_UNIX, "sys" }, 510 { RPC_AUTH_GSS_KRB5, "krb5" }, 511 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 512 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 513 { RPC_AUTH_GSS_LKEY, "lkey" }, 514 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 515 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 516 { RPC_AUTH_GSS_SPKM, "spkm" }, 517 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 518 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 519 { UINT_MAX, "unknown" } 520 }; 521 int i; 522 523 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 524 if (sec_flavours[i].flavour == flavour) 525 break; 526 } 527 return sec_flavours[i].str; 528 } 529 530 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 531 int showdefaults) 532 { 533 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 534 535 seq_printf(m, ",mountproto="); 536 switch (sap->sa_family) { 537 case AF_INET: 538 switch (nfss->mountd_protocol) { 539 case IPPROTO_UDP: 540 seq_printf(m, RPCBIND_NETID_UDP); 541 break; 542 case IPPROTO_TCP: 543 seq_printf(m, RPCBIND_NETID_TCP); 544 break; 545 default: 546 if (showdefaults) 547 seq_printf(m, "auto"); 548 } 549 break; 550 case AF_INET6: 551 switch (nfss->mountd_protocol) { 552 case IPPROTO_UDP: 553 seq_printf(m, RPCBIND_NETID_UDP6); 554 break; 555 case IPPROTO_TCP: 556 seq_printf(m, RPCBIND_NETID_TCP6); 557 break; 558 default: 559 if (showdefaults) 560 seq_printf(m, "auto"); 561 } 562 break; 563 default: 564 if (showdefaults) 565 seq_printf(m, "auto"); 566 } 567 } 568 569 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 570 int showdefaults) 571 { 572 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 573 574 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 575 return; 576 577 switch (sap->sa_family) { 578 case AF_INET: { 579 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 580 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 581 break; 582 } 583 case AF_INET6: { 584 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 585 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 586 break; 587 } 588 default: 589 if (showdefaults) 590 seq_printf(m, ",mountaddr=unspecified"); 591 } 592 593 if (nfss->mountd_version || showdefaults) 594 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 595 if ((nfss->mountd_port && 596 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 597 showdefaults) 598 seq_printf(m, ",mountport=%u", nfss->mountd_port); 599 600 nfs_show_mountd_netid(m, nfss, showdefaults); 601 } 602 603 #if IS_ENABLED(CONFIG_NFS_V4) 604 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 605 int showdefaults) 606 { 607 struct nfs_client *clp = nfss->nfs_client; 608 609 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 610 } 611 #else 612 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 613 int showdefaults) 614 { 615 } 616 #endif 617 618 static void nfs_show_nfs_version(struct seq_file *m, 619 unsigned int version, 620 unsigned int minorversion) 621 { 622 seq_printf(m, ",vers=%u", version); 623 if (version == 4) 624 seq_printf(m, ".%u", minorversion); 625 } 626 627 /* 628 * Describe the mount options in force on this server representation 629 */ 630 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 631 int showdefaults) 632 { 633 static const struct proc_nfs_info { 634 int flag; 635 const char *str; 636 const char *nostr; 637 } nfs_info[] = { 638 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 639 { NFS_MOUNT_POSIX, ",posix", "" }, 640 { NFS_MOUNT_NOCTO, ",nocto", "" }, 641 { NFS_MOUNT_NOAC, ",noac", "" }, 642 { NFS_MOUNT_NONLM, ",nolock", "" }, 643 { NFS_MOUNT_NOACL, ",noacl", "" }, 644 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 645 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 646 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 647 { 0, NULL, NULL } 648 }; 649 const struct proc_nfs_info *nfs_infop; 650 struct nfs_client *clp = nfss->nfs_client; 651 u32 version = clp->rpc_ops->version; 652 int local_flock, local_fcntl; 653 654 nfs_show_nfs_version(m, version, clp->cl_minorversion); 655 seq_printf(m, ",rsize=%u", nfss->rsize); 656 seq_printf(m, ",wsize=%u", nfss->wsize); 657 if (nfss->bsize != 0) 658 seq_printf(m, ",bsize=%u", nfss->bsize); 659 seq_printf(m, ",namlen=%u", nfss->namelen); 660 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 661 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 662 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 663 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 664 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 665 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 666 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 667 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 668 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 669 if (nfss->flags & nfs_infop->flag) 670 seq_puts(m, nfs_infop->str); 671 else 672 seq_puts(m, nfs_infop->nostr); 673 } 674 rcu_read_lock(); 675 seq_printf(m, ",proto=%s", 676 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 677 rcu_read_unlock(); 678 if (version == 4) { 679 if (nfss->port != NFS_PORT) 680 seq_printf(m, ",port=%u", nfss->port); 681 } else 682 if (nfss->port) 683 seq_printf(m, ",port=%u", nfss->port); 684 685 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 686 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 687 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 688 689 if (version != 4) 690 nfs_show_mountd_options(m, nfss, showdefaults); 691 else 692 nfs_show_nfsv4_options(m, nfss, showdefaults); 693 694 if (nfss->options & NFS_OPTION_FSCACHE) 695 seq_printf(m, ",fsc"); 696 697 if (nfss->options & NFS_OPTION_MIGRATION) 698 seq_printf(m, ",migration"); 699 700 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 702 seq_printf(m, ",lookupcache=none"); 703 else 704 seq_printf(m, ",lookupcache=pos"); 705 } 706 707 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 708 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 709 710 if (!local_flock && !local_fcntl) 711 seq_printf(m, ",local_lock=none"); 712 else if (local_flock && local_fcntl) 713 seq_printf(m, ",local_lock=all"); 714 else if (local_flock) 715 seq_printf(m, ",local_lock=flock"); 716 else 717 seq_printf(m, ",local_lock=posix"); 718 } 719 720 /* 721 * Describe the mount options on this VFS mountpoint 722 */ 723 int nfs_show_options(struct seq_file *m, struct dentry *root) 724 { 725 struct nfs_server *nfss = NFS_SB(root->d_sb); 726 727 nfs_show_mount_options(m, nfss, 0); 728 729 rcu_read_lock(); 730 seq_printf(m, ",addr=%s", 731 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 732 RPC_DISPLAY_ADDR)); 733 rcu_read_unlock(); 734 735 return 0; 736 } 737 EXPORT_SYMBOL_GPL(nfs_show_options); 738 739 #if IS_ENABLED(CONFIG_NFS_V4) 740 #ifdef CONFIG_NFS_V4_1 741 static void show_sessions(struct seq_file *m, struct nfs_server *server) 742 { 743 if (nfs4_has_session(server->nfs_client)) 744 seq_printf(m, ",sessions"); 745 } 746 #else 747 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 748 #endif 749 #endif 750 751 #ifdef CONFIG_NFS_V4_1 752 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 753 { 754 seq_printf(m, ",pnfs="); 755 if (server->pnfs_curr_ld) 756 seq_printf(m, "%s", server->pnfs_curr_ld->name); 757 else 758 seq_printf(m, "not configured"); 759 } 760 761 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 762 { 763 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 764 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 765 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 766 "date='%llu,%u'", 767 impl_id->name, impl_id->domain, 768 impl_id->date.seconds, impl_id->date.nseconds); 769 } 770 } 771 #else 772 #if IS_ENABLED(CONFIG_NFS_V4) 773 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 774 { 775 } 776 #endif 777 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 778 { 779 } 780 #endif 781 782 int nfs_show_devname(struct seq_file *m, struct dentry *root) 783 { 784 char *page = (char *) __get_free_page(GFP_KERNEL); 785 char *devname, *dummy; 786 int err = 0; 787 if (!page) 788 return -ENOMEM; 789 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 790 if (IS_ERR(devname)) 791 err = PTR_ERR(devname); 792 else 793 seq_escape(m, devname, " \t\n\\"); 794 free_page((unsigned long)page); 795 return err; 796 } 797 EXPORT_SYMBOL_GPL(nfs_show_devname); 798 799 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 800 { 801 seq_puts(m, "/"); 802 return 0; 803 } 804 EXPORT_SYMBOL_GPL(nfs_show_path); 805 806 /* 807 * Present statistical information for this VFS mountpoint 808 */ 809 int nfs_show_stats(struct seq_file *m, struct dentry *root) 810 { 811 int i, cpu; 812 struct nfs_server *nfss = NFS_SB(root->d_sb); 813 struct rpc_auth *auth = nfss->client->cl_auth; 814 struct nfs_iostats totals = { }; 815 816 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 817 818 /* 819 * Display all mount option settings 820 */ 821 seq_printf(m, "\n\topts:\t"); 822 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 823 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 824 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 825 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 826 nfs_show_mount_options(m, nfss, 1); 827 828 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 829 830 show_implementation_id(m, nfss); 831 832 seq_printf(m, "\n\tcaps:\t"); 833 seq_printf(m, "caps=0x%x", nfss->caps); 834 seq_printf(m, ",wtmult=%u", nfss->wtmult); 835 seq_printf(m, ",dtsize=%u", nfss->dtsize); 836 seq_printf(m, ",bsize=%u", nfss->bsize); 837 seq_printf(m, ",namlen=%u", nfss->namelen); 838 839 #if IS_ENABLED(CONFIG_NFS_V4) 840 if (nfss->nfs_client->rpc_ops->version == 4) { 841 seq_printf(m, "\n\tnfsv4:\t"); 842 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 843 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 844 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); 845 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 846 show_sessions(m, nfss); 847 show_pnfs(m, nfss); 848 } 849 #endif 850 851 /* 852 * Display security flavor in effect for this mount 853 */ 854 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 855 if (auth->au_flavor) 856 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 857 858 /* 859 * Display superblock I/O counters 860 */ 861 for_each_possible_cpu(cpu) { 862 struct nfs_iostats *stats; 863 864 preempt_disable(); 865 stats = per_cpu_ptr(nfss->io_stats, cpu); 866 867 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 868 totals.events[i] += stats->events[i]; 869 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 870 totals.bytes[i] += stats->bytes[i]; 871 #ifdef CONFIG_NFS_FSCACHE 872 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 873 totals.fscache[i] += stats->fscache[i]; 874 #endif 875 876 preempt_enable(); 877 } 878 879 seq_printf(m, "\n\tevents:\t"); 880 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 881 seq_printf(m, "%lu ", totals.events[i]); 882 seq_printf(m, "\n\tbytes:\t"); 883 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 884 seq_printf(m, "%Lu ", totals.bytes[i]); 885 #ifdef CONFIG_NFS_FSCACHE 886 if (nfss->options & NFS_OPTION_FSCACHE) { 887 seq_printf(m, "\n\tfsc:\t"); 888 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 889 seq_printf(m, "%Lu ", totals.bytes[i]); 890 } 891 #endif 892 seq_printf(m, "\n"); 893 894 rpc_print_iostats(m, nfss->client); 895 896 return 0; 897 } 898 EXPORT_SYMBOL_GPL(nfs_show_stats); 899 900 /* 901 * Begin unmount by attempting to remove all automounted mountpoints we added 902 * in response to xdev traversals and referrals 903 */ 904 void nfs_umount_begin(struct super_block *sb) 905 { 906 struct nfs_server *server; 907 struct rpc_clnt *rpc; 908 909 server = NFS_SB(sb); 910 /* -EIO all pending I/O */ 911 rpc = server->client_acl; 912 if (!IS_ERR(rpc)) 913 rpc_killall_tasks(rpc); 914 rpc = server->client; 915 if (!IS_ERR(rpc)) 916 rpc_killall_tasks(rpc); 917 } 918 EXPORT_SYMBOL_GPL(nfs_umount_begin); 919 920 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 921 { 922 struct nfs_parsed_mount_data *data; 923 924 data = kzalloc(sizeof(*data), GFP_KERNEL); 925 if (data) { 926 data->acregmin = NFS_DEF_ACREGMIN; 927 data->acregmax = NFS_DEF_ACREGMAX; 928 data->acdirmin = NFS_DEF_ACDIRMIN; 929 data->acdirmax = NFS_DEF_ACDIRMAX; 930 data->mount_server.port = NFS_UNSPEC_PORT; 931 data->nfs_server.port = NFS_UNSPEC_PORT; 932 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 933 data->selected_flavor = RPC_AUTH_MAXFLAVOR; 934 data->minorversion = 0; 935 data->need_mount = true; 936 data->net = current->nsproxy->net_ns; 937 security_init_mnt_opts(&data->lsm_opts); 938 } 939 return data; 940 } 941 942 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 943 { 944 if (data) { 945 kfree(data->client_address); 946 kfree(data->mount_server.hostname); 947 kfree(data->nfs_server.export_path); 948 kfree(data->nfs_server.hostname); 949 kfree(data->fscache_uniq); 950 security_free_mnt_opts(&data->lsm_opts); 951 kfree(data); 952 } 953 } 954 955 /* 956 * Sanity-check a server address provided by the mount command. 957 * 958 * Address family must be initialized, and address must not be 959 * the ANY address for that family. 960 */ 961 static int nfs_verify_server_address(struct sockaddr *addr) 962 { 963 switch (addr->sa_family) { 964 case AF_INET: { 965 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 966 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 967 } 968 case AF_INET6: { 969 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 970 return !ipv6_addr_any(sa); 971 } 972 } 973 974 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 975 return 0; 976 } 977 978 /* 979 * Select between a default port value and a user-specified port value. 980 * If a zero value is set, then autobind will be used. 981 */ 982 static void nfs_set_port(struct sockaddr *sap, int *port, 983 const unsigned short default_port) 984 { 985 if (*port == NFS_UNSPEC_PORT) 986 *port = default_port; 987 988 rpc_set_port(sap, *port); 989 } 990 991 /* 992 * Sanity check the NFS transport protocol. 993 * 994 */ 995 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 996 { 997 switch (mnt->nfs_server.protocol) { 998 case XPRT_TRANSPORT_UDP: 999 case XPRT_TRANSPORT_TCP: 1000 case XPRT_TRANSPORT_RDMA: 1001 break; 1002 default: 1003 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1004 } 1005 } 1006 1007 /* 1008 * For text based NFSv2/v3 mounts, the mount protocol transport default 1009 * settings should depend upon the specified NFS transport. 1010 */ 1011 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1012 { 1013 nfs_validate_transport_protocol(mnt); 1014 1015 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1016 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1017 return; 1018 switch (mnt->nfs_server.protocol) { 1019 case XPRT_TRANSPORT_UDP: 1020 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1021 break; 1022 case XPRT_TRANSPORT_TCP: 1023 case XPRT_TRANSPORT_RDMA: 1024 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1025 } 1026 } 1027 1028 /* 1029 * Add 'flavor' to 'auth_info' if not already present. 1030 * Returns true if 'flavor' ends up in the list, false otherwise 1031 */ 1032 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, 1033 rpc_authflavor_t flavor) 1034 { 1035 unsigned int i; 1036 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors); 1037 1038 /* make sure this flavor isn't already in the list */ 1039 for (i = 0; i < auth_info->flavor_len; i++) { 1040 if (flavor == auth_info->flavors[i]) 1041 return true; 1042 } 1043 1044 if (auth_info->flavor_len + 1 >= max_flavor_len) { 1045 dfprintk(MOUNT, "NFS: too many sec= flavors\n"); 1046 return false; 1047 } 1048 1049 auth_info->flavors[auth_info->flavor_len++] = flavor; 1050 return true; 1051 } 1052 1053 /* 1054 * Return true if 'match' is in auth_info or auth_info is empty. 1055 * Return false otherwise. 1056 */ 1057 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 1058 rpc_authflavor_t match) 1059 { 1060 int i; 1061 1062 if (!auth_info->flavor_len) 1063 return true; 1064 1065 for (i = 0; i < auth_info->flavor_len; i++) { 1066 if (auth_info->flavors[i] == match) 1067 return true; 1068 } 1069 return false; 1070 } 1071 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 1072 1073 /* 1074 * Parse the value of the 'sec=' option. 1075 */ 1076 static int nfs_parse_security_flavors(char *value, 1077 struct nfs_parsed_mount_data *mnt) 1078 { 1079 substring_t args[MAX_OPT_ARGS]; 1080 rpc_authflavor_t pseudoflavor; 1081 char *p; 1082 1083 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1084 1085 while ((p = strsep(&value, ":")) != NULL) { 1086 switch (match_token(p, nfs_secflavor_tokens, args)) { 1087 case Opt_sec_none: 1088 pseudoflavor = RPC_AUTH_NULL; 1089 break; 1090 case Opt_sec_sys: 1091 pseudoflavor = RPC_AUTH_UNIX; 1092 break; 1093 case Opt_sec_krb5: 1094 pseudoflavor = RPC_AUTH_GSS_KRB5; 1095 break; 1096 case Opt_sec_krb5i: 1097 pseudoflavor = RPC_AUTH_GSS_KRB5I; 1098 break; 1099 case Opt_sec_krb5p: 1100 pseudoflavor = RPC_AUTH_GSS_KRB5P; 1101 break; 1102 case Opt_sec_lkey: 1103 pseudoflavor = RPC_AUTH_GSS_LKEY; 1104 break; 1105 case Opt_sec_lkeyi: 1106 pseudoflavor = RPC_AUTH_GSS_LKEYI; 1107 break; 1108 case Opt_sec_lkeyp: 1109 pseudoflavor = RPC_AUTH_GSS_LKEYP; 1110 break; 1111 case Opt_sec_spkm: 1112 pseudoflavor = RPC_AUTH_GSS_SPKM; 1113 break; 1114 case Opt_sec_spkmi: 1115 pseudoflavor = RPC_AUTH_GSS_SPKMI; 1116 break; 1117 case Opt_sec_spkmp: 1118 pseudoflavor = RPC_AUTH_GSS_SPKMP; 1119 break; 1120 default: 1121 dfprintk(MOUNT, 1122 "NFS: sec= option '%s' not recognized\n", p); 1123 return 0; 1124 } 1125 1126 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor)) 1127 return 0; 1128 } 1129 1130 return 1; 1131 } 1132 1133 static int nfs_parse_version_string(char *string, 1134 struct nfs_parsed_mount_data *mnt, 1135 substring_t *args) 1136 { 1137 mnt->flags &= ~NFS_MOUNT_VER3; 1138 switch (match_token(string, nfs_vers_tokens, args)) { 1139 case Opt_vers_2: 1140 mnt->version = 2; 1141 break; 1142 case Opt_vers_3: 1143 mnt->flags |= NFS_MOUNT_VER3; 1144 mnt->version = 3; 1145 break; 1146 case Opt_vers_4: 1147 /* Backward compatibility option. In future, 1148 * the mount program should always supply 1149 * a NFSv4 minor version number. 1150 */ 1151 mnt->version = 4; 1152 break; 1153 case Opt_vers_4_0: 1154 mnt->version = 4; 1155 mnt->minorversion = 0; 1156 break; 1157 case Opt_vers_4_1: 1158 mnt->version = 4; 1159 mnt->minorversion = 1; 1160 break; 1161 case Opt_vers_4_2: 1162 mnt->version = 4; 1163 mnt->minorversion = 2; 1164 break; 1165 default: 1166 return 0; 1167 } 1168 return 1; 1169 } 1170 1171 static int nfs_get_option_str(substring_t args[], char **option) 1172 { 1173 kfree(*option); 1174 *option = match_strdup(args); 1175 return !*option; 1176 } 1177 1178 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1179 { 1180 int rc; 1181 char *string; 1182 1183 string = match_strdup(args); 1184 if (string == NULL) 1185 return -ENOMEM; 1186 rc = kstrtoul(string, 10, option); 1187 kfree(string); 1188 1189 return rc; 1190 } 1191 1192 /* 1193 * Error-check and convert a string of mount options from user space into 1194 * a data structure. The whole mount string is processed; bad options are 1195 * skipped as they are encountered. If there were no errors, return 1; 1196 * otherwise return 0 (zero). 1197 */ 1198 static int nfs_parse_mount_options(char *raw, 1199 struct nfs_parsed_mount_data *mnt) 1200 { 1201 char *p, *string, *secdata; 1202 int rc, sloppy = 0, invalid_option = 0; 1203 unsigned short protofamily = AF_UNSPEC; 1204 unsigned short mountfamily = AF_UNSPEC; 1205 1206 if (!raw) { 1207 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1208 return 1; 1209 } 1210 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1211 1212 secdata = alloc_secdata(); 1213 if (!secdata) 1214 goto out_nomem; 1215 1216 rc = security_sb_copy_data(raw, secdata); 1217 if (rc) 1218 goto out_security_failure; 1219 1220 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1221 if (rc) 1222 goto out_security_failure; 1223 1224 free_secdata(secdata); 1225 1226 while ((p = strsep(&raw, ",")) != NULL) { 1227 substring_t args[MAX_OPT_ARGS]; 1228 unsigned long option; 1229 int token; 1230 1231 if (!*p) 1232 continue; 1233 1234 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1235 1236 token = match_token(p, nfs_mount_option_tokens, args); 1237 switch (token) { 1238 1239 /* 1240 * boolean options: foo/nofoo 1241 */ 1242 case Opt_soft: 1243 mnt->flags |= NFS_MOUNT_SOFT; 1244 break; 1245 case Opt_hard: 1246 mnt->flags &= ~NFS_MOUNT_SOFT; 1247 break; 1248 case Opt_posix: 1249 mnt->flags |= NFS_MOUNT_POSIX; 1250 break; 1251 case Opt_noposix: 1252 mnt->flags &= ~NFS_MOUNT_POSIX; 1253 break; 1254 case Opt_cto: 1255 mnt->flags &= ~NFS_MOUNT_NOCTO; 1256 break; 1257 case Opt_nocto: 1258 mnt->flags |= NFS_MOUNT_NOCTO; 1259 break; 1260 case Opt_ac: 1261 mnt->flags &= ~NFS_MOUNT_NOAC; 1262 break; 1263 case Opt_noac: 1264 mnt->flags |= NFS_MOUNT_NOAC; 1265 break; 1266 case Opt_lock: 1267 mnt->flags &= ~NFS_MOUNT_NONLM; 1268 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1269 NFS_MOUNT_LOCAL_FCNTL); 1270 break; 1271 case Opt_nolock: 1272 mnt->flags |= NFS_MOUNT_NONLM; 1273 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1274 NFS_MOUNT_LOCAL_FCNTL); 1275 break; 1276 case Opt_udp: 1277 mnt->flags &= ~NFS_MOUNT_TCP; 1278 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1279 break; 1280 case Opt_tcp: 1281 mnt->flags |= NFS_MOUNT_TCP; 1282 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1283 break; 1284 case Opt_rdma: 1285 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1286 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1287 xprt_load_transport(p); 1288 break; 1289 case Opt_acl: 1290 mnt->flags &= ~NFS_MOUNT_NOACL; 1291 break; 1292 case Opt_noacl: 1293 mnt->flags |= NFS_MOUNT_NOACL; 1294 break; 1295 case Opt_rdirplus: 1296 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1297 break; 1298 case Opt_nordirplus: 1299 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1300 break; 1301 case Opt_sharecache: 1302 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1303 break; 1304 case Opt_nosharecache: 1305 mnt->flags |= NFS_MOUNT_UNSHARED; 1306 break; 1307 case Opt_resvport: 1308 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1309 break; 1310 case Opt_noresvport: 1311 mnt->flags |= NFS_MOUNT_NORESVPORT; 1312 break; 1313 case Opt_fscache: 1314 mnt->options |= NFS_OPTION_FSCACHE; 1315 kfree(mnt->fscache_uniq); 1316 mnt->fscache_uniq = NULL; 1317 break; 1318 case Opt_nofscache: 1319 mnt->options &= ~NFS_OPTION_FSCACHE; 1320 kfree(mnt->fscache_uniq); 1321 mnt->fscache_uniq = NULL; 1322 break; 1323 case Opt_migration: 1324 mnt->options |= NFS_OPTION_MIGRATION; 1325 break; 1326 case Opt_nomigration: 1327 mnt->options &= NFS_OPTION_MIGRATION; 1328 break; 1329 1330 /* 1331 * options that take numeric values 1332 */ 1333 case Opt_port: 1334 if (nfs_get_option_ul(args, &option) || 1335 option > USHRT_MAX) 1336 goto out_invalid_value; 1337 mnt->nfs_server.port = option; 1338 break; 1339 case Opt_rsize: 1340 if (nfs_get_option_ul(args, &option)) 1341 goto out_invalid_value; 1342 mnt->rsize = option; 1343 break; 1344 case Opt_wsize: 1345 if (nfs_get_option_ul(args, &option)) 1346 goto out_invalid_value; 1347 mnt->wsize = option; 1348 break; 1349 case Opt_bsize: 1350 if (nfs_get_option_ul(args, &option)) 1351 goto out_invalid_value; 1352 mnt->bsize = option; 1353 break; 1354 case Opt_timeo: 1355 if (nfs_get_option_ul(args, &option) || option == 0) 1356 goto out_invalid_value; 1357 mnt->timeo = option; 1358 break; 1359 case Opt_retrans: 1360 if (nfs_get_option_ul(args, &option) || option == 0) 1361 goto out_invalid_value; 1362 mnt->retrans = option; 1363 break; 1364 case Opt_acregmin: 1365 if (nfs_get_option_ul(args, &option)) 1366 goto out_invalid_value; 1367 mnt->acregmin = option; 1368 break; 1369 case Opt_acregmax: 1370 if (nfs_get_option_ul(args, &option)) 1371 goto out_invalid_value; 1372 mnt->acregmax = option; 1373 break; 1374 case Opt_acdirmin: 1375 if (nfs_get_option_ul(args, &option)) 1376 goto out_invalid_value; 1377 mnt->acdirmin = option; 1378 break; 1379 case Opt_acdirmax: 1380 if (nfs_get_option_ul(args, &option)) 1381 goto out_invalid_value; 1382 mnt->acdirmax = option; 1383 break; 1384 case Opt_actimeo: 1385 if (nfs_get_option_ul(args, &option)) 1386 goto out_invalid_value; 1387 mnt->acregmin = mnt->acregmax = 1388 mnt->acdirmin = mnt->acdirmax = option; 1389 break; 1390 case Opt_namelen: 1391 if (nfs_get_option_ul(args, &option)) 1392 goto out_invalid_value; 1393 mnt->namlen = option; 1394 break; 1395 case Opt_mountport: 1396 if (nfs_get_option_ul(args, &option) || 1397 option > USHRT_MAX) 1398 goto out_invalid_value; 1399 mnt->mount_server.port = option; 1400 break; 1401 case Opt_mountvers: 1402 if (nfs_get_option_ul(args, &option) || 1403 option < NFS_MNT_VERSION || 1404 option > NFS_MNT3_VERSION) 1405 goto out_invalid_value; 1406 mnt->mount_server.version = option; 1407 break; 1408 case Opt_minorversion: 1409 if (nfs_get_option_ul(args, &option)) 1410 goto out_invalid_value; 1411 if (option > NFS4_MAX_MINOR_VERSION) 1412 goto out_invalid_value; 1413 mnt->minorversion = option; 1414 break; 1415 1416 /* 1417 * options that take text values 1418 */ 1419 case Opt_nfsvers: 1420 string = match_strdup(args); 1421 if (string == NULL) 1422 goto out_nomem; 1423 rc = nfs_parse_version_string(string, mnt, args); 1424 kfree(string); 1425 if (!rc) 1426 goto out_invalid_value; 1427 break; 1428 case Opt_sec: 1429 string = match_strdup(args); 1430 if (string == NULL) 1431 goto out_nomem; 1432 rc = nfs_parse_security_flavors(string, mnt); 1433 kfree(string); 1434 if (!rc) { 1435 dfprintk(MOUNT, "NFS: unrecognized " 1436 "security flavor\n"); 1437 return 0; 1438 } 1439 break; 1440 case Opt_proto: 1441 string = match_strdup(args); 1442 if (string == NULL) 1443 goto out_nomem; 1444 token = match_token(string, 1445 nfs_xprt_protocol_tokens, args); 1446 1447 protofamily = AF_INET; 1448 switch (token) { 1449 case Opt_xprt_udp6: 1450 protofamily = AF_INET6; 1451 case Opt_xprt_udp: 1452 mnt->flags &= ~NFS_MOUNT_TCP; 1453 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1454 break; 1455 case Opt_xprt_tcp6: 1456 protofamily = AF_INET6; 1457 case Opt_xprt_tcp: 1458 mnt->flags |= NFS_MOUNT_TCP; 1459 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1460 break; 1461 case Opt_xprt_rdma6: 1462 protofamily = AF_INET6; 1463 case Opt_xprt_rdma: 1464 /* vector side protocols to TCP */ 1465 mnt->flags |= NFS_MOUNT_TCP; 1466 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1467 xprt_load_transport(string); 1468 break; 1469 default: 1470 dfprintk(MOUNT, "NFS: unrecognized " 1471 "transport protocol\n"); 1472 kfree(string); 1473 return 0; 1474 } 1475 kfree(string); 1476 break; 1477 case Opt_mountproto: 1478 string = match_strdup(args); 1479 if (string == NULL) 1480 goto out_nomem; 1481 token = match_token(string, 1482 nfs_xprt_protocol_tokens, args); 1483 kfree(string); 1484 1485 mountfamily = AF_INET; 1486 switch (token) { 1487 case Opt_xprt_udp6: 1488 mountfamily = AF_INET6; 1489 case Opt_xprt_udp: 1490 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1491 break; 1492 case Opt_xprt_tcp6: 1493 mountfamily = AF_INET6; 1494 case Opt_xprt_tcp: 1495 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1496 break; 1497 case Opt_xprt_rdma: /* not used for side protocols */ 1498 default: 1499 dfprintk(MOUNT, "NFS: unrecognized " 1500 "transport protocol\n"); 1501 return 0; 1502 } 1503 break; 1504 case Opt_addr: 1505 string = match_strdup(args); 1506 if (string == NULL) 1507 goto out_nomem; 1508 mnt->nfs_server.addrlen = 1509 rpc_pton(mnt->net, string, strlen(string), 1510 (struct sockaddr *) 1511 &mnt->nfs_server.address, 1512 sizeof(mnt->nfs_server.address)); 1513 kfree(string); 1514 if (mnt->nfs_server.addrlen == 0) 1515 goto out_invalid_address; 1516 break; 1517 case Opt_clientaddr: 1518 if (nfs_get_option_str(args, &mnt->client_address)) 1519 goto out_nomem; 1520 break; 1521 case Opt_mounthost: 1522 if (nfs_get_option_str(args, 1523 &mnt->mount_server.hostname)) 1524 goto out_nomem; 1525 break; 1526 case Opt_mountaddr: 1527 string = match_strdup(args); 1528 if (string == NULL) 1529 goto out_nomem; 1530 mnt->mount_server.addrlen = 1531 rpc_pton(mnt->net, string, strlen(string), 1532 (struct sockaddr *) 1533 &mnt->mount_server.address, 1534 sizeof(mnt->mount_server.address)); 1535 kfree(string); 1536 if (mnt->mount_server.addrlen == 0) 1537 goto out_invalid_address; 1538 break; 1539 case Opt_lookupcache: 1540 string = match_strdup(args); 1541 if (string == NULL) 1542 goto out_nomem; 1543 token = match_token(string, 1544 nfs_lookupcache_tokens, args); 1545 kfree(string); 1546 switch (token) { 1547 case Opt_lookupcache_all: 1548 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1549 break; 1550 case Opt_lookupcache_positive: 1551 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1552 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1553 break; 1554 case Opt_lookupcache_none: 1555 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1556 break; 1557 default: 1558 dfprintk(MOUNT, "NFS: invalid " 1559 "lookupcache argument\n"); 1560 return 0; 1561 }; 1562 break; 1563 case Opt_fscache_uniq: 1564 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1565 goto out_nomem; 1566 mnt->options |= NFS_OPTION_FSCACHE; 1567 break; 1568 case Opt_local_lock: 1569 string = match_strdup(args); 1570 if (string == NULL) 1571 goto out_nomem; 1572 token = match_token(string, nfs_local_lock_tokens, 1573 args); 1574 kfree(string); 1575 switch (token) { 1576 case Opt_local_lock_all: 1577 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1578 NFS_MOUNT_LOCAL_FCNTL); 1579 break; 1580 case Opt_local_lock_flock: 1581 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1582 break; 1583 case Opt_local_lock_posix: 1584 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1585 break; 1586 case Opt_local_lock_none: 1587 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1588 NFS_MOUNT_LOCAL_FCNTL); 1589 break; 1590 default: 1591 dfprintk(MOUNT, "NFS: invalid " 1592 "local_lock argument\n"); 1593 return 0; 1594 }; 1595 break; 1596 1597 /* 1598 * Special options 1599 */ 1600 case Opt_sloppy: 1601 sloppy = 1; 1602 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1603 break; 1604 case Opt_userspace: 1605 case Opt_deprecated: 1606 dfprintk(MOUNT, "NFS: ignoring mount option " 1607 "'%s'\n", p); 1608 break; 1609 1610 default: 1611 invalid_option = 1; 1612 dfprintk(MOUNT, "NFS: unrecognized mount option " 1613 "'%s'\n", p); 1614 } 1615 } 1616 1617 if (!sloppy && invalid_option) 1618 return 0; 1619 1620 if (mnt->minorversion && mnt->version != 4) 1621 goto out_minorversion_mismatch; 1622 1623 if (mnt->options & NFS_OPTION_MIGRATION && 1624 (mnt->version != 4 || mnt->minorversion != 0)) 1625 goto out_migration_misuse; 1626 1627 /* 1628 * verify that any proto=/mountproto= options match the address 1629 * families in the addr=/mountaddr= options. 1630 */ 1631 if (protofamily != AF_UNSPEC && 1632 protofamily != mnt->nfs_server.address.ss_family) 1633 goto out_proto_mismatch; 1634 1635 if (mountfamily != AF_UNSPEC) { 1636 if (mnt->mount_server.addrlen) { 1637 if (mountfamily != mnt->mount_server.address.ss_family) 1638 goto out_mountproto_mismatch; 1639 } else { 1640 if (mountfamily != mnt->nfs_server.address.ss_family) 1641 goto out_mountproto_mismatch; 1642 } 1643 } 1644 1645 return 1; 1646 1647 out_mountproto_mismatch: 1648 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1649 "option\n"); 1650 return 0; 1651 out_proto_mismatch: 1652 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1653 return 0; 1654 out_invalid_address: 1655 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1656 return 0; 1657 out_invalid_value: 1658 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1659 return 0; 1660 out_minorversion_mismatch: 1661 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1662 "minorversion=%u\n", mnt->version, mnt->minorversion); 1663 return 0; 1664 out_migration_misuse: 1665 printk(KERN_INFO 1666 "NFS: 'migration' not supported for this NFS version\n"); 1667 return 0; 1668 out_nomem: 1669 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1670 return 0; 1671 out_security_failure: 1672 free_secdata(secdata); 1673 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1674 return 0; 1675 } 1676 1677 /* 1678 * Ensure that a specified authtype in args->auth_info is supported by 1679 * the server. Returns 0 and sets args->selected_flavor if it's ok, and 1680 * -EACCES if not. 1681 */ 1682 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args, 1683 rpc_authflavor_t *server_authlist, unsigned int count) 1684 { 1685 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 1686 unsigned int i; 1687 int use_auth_null = false; 1688 1689 /* 1690 * If the sec= mount option is used, the specified flavor or AUTH_NULL 1691 * must be in the list returned by the server. 1692 * 1693 * AUTH_NULL has a special meaning when it's in the server list - it 1694 * means that the server will ignore the rpc creds, so any flavor 1695 * can be used but still use the sec= that was specified. 1696 */ 1697 for (i = 0; i < count; i++) { 1698 flavor = server_authlist[i]; 1699 1700 if (nfs_auth_info_match(&args->auth_info, flavor)) 1701 goto out; 1702 1703 if (flavor == RPC_AUTH_NULL) 1704 use_auth_null = true; 1705 } 1706 1707 if (use_auth_null) { 1708 flavor = RPC_AUTH_NULL; 1709 goto out; 1710 } 1711 1712 dfprintk(MOUNT, 1713 "NFS: specified auth flavors not supported by server\n"); 1714 return -EACCES; 1715 1716 out: 1717 args->selected_flavor = flavor; 1718 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor); 1719 return 0; 1720 } 1721 1722 /* 1723 * Use the remote server's MOUNT service to request the NFS file handle 1724 * corresponding to the provided path. 1725 */ 1726 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1727 struct nfs_fh *root_fh, 1728 rpc_authflavor_t *server_authlist, 1729 unsigned int *server_authlist_len) 1730 { 1731 struct nfs_mount_request request = { 1732 .sap = (struct sockaddr *) 1733 &args->mount_server.address, 1734 .dirpath = args->nfs_server.export_path, 1735 .protocol = args->mount_server.protocol, 1736 .fh = root_fh, 1737 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1738 .auth_flav_len = server_authlist_len, 1739 .auth_flavs = server_authlist, 1740 .net = args->net, 1741 }; 1742 int status; 1743 1744 if (args->mount_server.version == 0) { 1745 switch (args->version) { 1746 default: 1747 args->mount_server.version = NFS_MNT3_VERSION; 1748 break; 1749 case 2: 1750 args->mount_server.version = NFS_MNT_VERSION; 1751 } 1752 } 1753 request.version = args->mount_server.version; 1754 1755 if (args->mount_server.hostname) 1756 request.hostname = args->mount_server.hostname; 1757 else 1758 request.hostname = args->nfs_server.hostname; 1759 1760 /* 1761 * Construct the mount server's address. 1762 */ 1763 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1764 memcpy(request.sap, &args->nfs_server.address, 1765 args->nfs_server.addrlen); 1766 args->mount_server.addrlen = args->nfs_server.addrlen; 1767 } 1768 request.salen = args->mount_server.addrlen; 1769 nfs_set_port(request.sap, &args->mount_server.port, 0); 1770 1771 /* 1772 * Now ask the mount server to map our export path 1773 * to a file handle. 1774 */ 1775 status = nfs_mount(&request); 1776 if (status != 0) { 1777 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1778 request.hostname, status); 1779 return status; 1780 } 1781 1782 return 0; 1783 } 1784 1785 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, 1786 struct nfs_subversion *nfs_mod) 1787 { 1788 int status; 1789 unsigned int i; 1790 bool tried_auth_unix = false; 1791 bool auth_null_in_list = false; 1792 struct nfs_server *server = ERR_PTR(-EACCES); 1793 struct nfs_parsed_mount_data *args = mount_info->parsed; 1794 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 1795 unsigned int authlist_len = ARRAY_SIZE(authlist); 1796 1797 status = nfs_request_mount(args, mount_info->mntfh, authlist, 1798 &authlist_len); 1799 if (status) 1800 return ERR_PTR(status); 1801 1802 /* 1803 * Was a sec= authflavor specified in the options? First, verify 1804 * whether the server supports it, and then just try to use it if so. 1805 */ 1806 if (args->auth_info.flavor_len > 0) { 1807 status = nfs_verify_authflavors(args, authlist, authlist_len); 1808 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 1809 args->selected_flavor); 1810 if (status) 1811 return ERR_PTR(status); 1812 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1813 } 1814 1815 /* 1816 * No sec= option was provided. RFC 2623, section 2.7 suggests we 1817 * SHOULD prefer the flavor listed first. However, some servers list 1818 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 1819 */ 1820 for (i = 0; i < authlist_len; ++i) { 1821 rpc_authflavor_t flavor; 1822 struct rpcsec_gss_info info; 1823 1824 flavor = authlist[i]; 1825 switch (flavor) { 1826 case RPC_AUTH_UNIX: 1827 tried_auth_unix = true; 1828 break; 1829 case RPC_AUTH_NULL: 1830 auth_null_in_list = true; 1831 continue; 1832 default: 1833 if (rpcauth_get_gssinfo(flavor, &info) != 0) 1834 continue; 1835 /* Fallthrough */ 1836 } 1837 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 1838 args->selected_flavor = flavor; 1839 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1840 if (!IS_ERR(server)) 1841 return server; 1842 } 1843 1844 /* 1845 * Nothing we tried so far worked. At this point, give up if we've 1846 * already tried AUTH_UNIX or if the server's list doesn't contain 1847 * AUTH_NULL 1848 */ 1849 if (tried_auth_unix || !auth_null_in_list) 1850 return server; 1851 1852 /* Last chance! Try AUTH_UNIX */ 1853 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 1854 args->selected_flavor = RPC_AUTH_UNIX; 1855 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1856 } 1857 1858 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1859 struct nfs_mount_info *mount_info, 1860 struct nfs_subversion *nfs_mod) 1861 { 1862 struct nfs_server *server; 1863 1864 if (mount_info->parsed->need_mount) 1865 server = nfs_try_mount_request(mount_info, nfs_mod); 1866 else 1867 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1868 1869 if (IS_ERR(server)) 1870 return ERR_CAST(server); 1871 1872 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1873 } 1874 EXPORT_SYMBOL_GPL(nfs_try_mount); 1875 1876 /* 1877 * Split "dev_name" into "hostname:export_path". 1878 * 1879 * The leftmost colon demarks the split between the server's hostname 1880 * and the export path. If the hostname starts with a left square 1881 * bracket, then it may contain colons. 1882 * 1883 * Note: caller frees hostname and export path, even on error. 1884 */ 1885 static int nfs_parse_devname(const char *dev_name, 1886 char **hostname, size_t maxnamlen, 1887 char **export_path, size_t maxpathlen) 1888 { 1889 size_t len; 1890 char *end; 1891 1892 /* Is the host name protected with square brakcets? */ 1893 if (*dev_name == '[') { 1894 end = strchr(++dev_name, ']'); 1895 if (end == NULL || end[1] != ':') 1896 goto out_bad_devname; 1897 1898 len = end - dev_name; 1899 end++; 1900 } else { 1901 char *comma; 1902 1903 end = strchr(dev_name, ':'); 1904 if (end == NULL) 1905 goto out_bad_devname; 1906 len = end - dev_name; 1907 1908 /* kill possible hostname list: not supported */ 1909 comma = strchr(dev_name, ','); 1910 if (comma != NULL && comma < end) 1911 *comma = 0; 1912 } 1913 1914 if (len > maxnamlen) 1915 goto out_hostname; 1916 1917 /* N.B. caller will free nfs_server.hostname in all cases */ 1918 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1919 if (*hostname == NULL) 1920 goto out_nomem; 1921 len = strlen(++end); 1922 if (len > maxpathlen) 1923 goto out_path; 1924 *export_path = kstrndup(end, len, GFP_KERNEL); 1925 if (!*export_path) 1926 goto out_nomem; 1927 1928 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1929 return 0; 1930 1931 out_bad_devname: 1932 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1933 return -EINVAL; 1934 1935 out_nomem: 1936 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1937 return -ENOMEM; 1938 1939 out_hostname: 1940 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1941 return -ENAMETOOLONG; 1942 1943 out_path: 1944 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1945 return -ENAMETOOLONG; 1946 } 1947 1948 /* 1949 * Validate the NFS2/NFS3 mount data 1950 * - fills in the mount root filehandle 1951 * 1952 * For option strings, user space handles the following behaviors: 1953 * 1954 * + DNS: mapping server host name to IP address ("addr=" option) 1955 * 1956 * + failure mode: how to behave if a mount request can't be handled 1957 * immediately ("fg/bg" option) 1958 * 1959 * + retry: how often to retry a mount request ("retry=" option) 1960 * 1961 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1962 * mountproto=tcp after mountproto=udp, and so on 1963 */ 1964 static int nfs23_validate_mount_data(void *options, 1965 struct nfs_parsed_mount_data *args, 1966 struct nfs_fh *mntfh, 1967 const char *dev_name) 1968 { 1969 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1970 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1971 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; 1972 1973 if (data == NULL) 1974 goto out_no_data; 1975 1976 args->version = NFS_DEFAULT_VERSION; 1977 switch (data->version) { 1978 case 1: 1979 data->namlen = 0; 1980 case 2: 1981 data->bsize = 0; 1982 case 3: 1983 if (data->flags & NFS_MOUNT_VER3) 1984 goto out_no_v3; 1985 data->root.size = NFS2_FHSIZE; 1986 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1987 /* Turn off security negotiation */ 1988 extra_flags |= NFS_MOUNT_SECFLAVOUR; 1989 case 4: 1990 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1991 goto out_no_sec; 1992 case 5: 1993 memset(data->context, 0, sizeof(data->context)); 1994 case 6: 1995 if (data->flags & NFS_MOUNT_VER3) { 1996 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1997 goto out_invalid_fh; 1998 mntfh->size = data->root.size; 1999 args->version = 3; 2000 } else { 2001 mntfh->size = NFS2_FHSIZE; 2002 args->version = 2; 2003 } 2004 2005 2006 memcpy(mntfh->data, data->root.data, mntfh->size); 2007 if (mntfh->size < sizeof(mntfh->data)) 2008 memset(mntfh->data + mntfh->size, 0, 2009 sizeof(mntfh->data) - mntfh->size); 2010 2011 /* 2012 * Translate to nfs_parsed_mount_data, which nfs_fill_super 2013 * can deal with. 2014 */ 2015 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 2016 args->flags |= extra_flags; 2017 args->rsize = data->rsize; 2018 args->wsize = data->wsize; 2019 args->timeo = data->timeo; 2020 args->retrans = data->retrans; 2021 args->acregmin = data->acregmin; 2022 args->acregmax = data->acregmax; 2023 args->acdirmin = data->acdirmin; 2024 args->acdirmax = data->acdirmax; 2025 args->need_mount = false; 2026 2027 memcpy(sap, &data->addr, sizeof(data->addr)); 2028 args->nfs_server.addrlen = sizeof(data->addr); 2029 args->nfs_server.port = ntohs(data->addr.sin_port); 2030 if (!nfs_verify_server_address(sap)) 2031 goto out_no_address; 2032 2033 if (!(data->flags & NFS_MOUNT_TCP)) 2034 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 2035 /* N.B. caller will free nfs_server.hostname in all cases */ 2036 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 2037 args->namlen = data->namlen; 2038 args->bsize = data->bsize; 2039 2040 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2041 args->selected_flavor = data->pseudoflavor; 2042 else 2043 args->selected_flavor = RPC_AUTH_UNIX; 2044 if (!args->nfs_server.hostname) 2045 goto out_nomem; 2046 2047 if (!(data->flags & NFS_MOUNT_NONLM)) 2048 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 2049 NFS_MOUNT_LOCAL_FCNTL); 2050 else 2051 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 2052 NFS_MOUNT_LOCAL_FCNTL); 2053 /* 2054 * The legacy version 6 binary mount data from userspace has a 2055 * field used only to transport selinux information into the 2056 * the kernel. To continue to support that functionality we 2057 * have a touch of selinux knowledge here in the NFS code. The 2058 * userspace code converted context=blah to just blah so we are 2059 * converting back to the full string selinux understands. 2060 */ 2061 if (data->context[0]){ 2062 #ifdef CONFIG_SECURITY_SELINUX 2063 int rc; 2064 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 2065 if (!opts_str) 2066 return -ENOMEM; 2067 strcpy(opts_str, "context="); 2068 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 2069 strcat(opts_str, &data->context[0]); 2070 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 2071 kfree(opts_str); 2072 if (rc) 2073 return rc; 2074 #else 2075 return -EINVAL; 2076 #endif 2077 } 2078 2079 break; 2080 default: 2081 return NFS_TEXT_DATA; 2082 } 2083 2084 return 0; 2085 2086 out_no_data: 2087 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2088 return -EINVAL; 2089 2090 out_no_v3: 2091 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2092 data->version); 2093 return -EINVAL; 2094 2095 out_no_sec: 2096 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2097 return -EINVAL; 2098 2099 out_nomem: 2100 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2101 return -ENOMEM; 2102 2103 out_no_address: 2104 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2105 return -EINVAL; 2106 2107 out_invalid_fh: 2108 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2109 return -EINVAL; 2110 } 2111 2112 #if IS_ENABLED(CONFIG_NFS_V4) 2113 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2114 void *options, 2115 struct nfs_parsed_mount_data *args, 2116 struct nfs_fh *mntfh, 2117 const char *dev_name) 2118 { 2119 if (fs_type == &nfs_fs_type) 2120 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2121 return nfs4_validate_mount_data(options, args, dev_name); 2122 } 2123 #else 2124 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2125 void *options, 2126 struct nfs_parsed_mount_data *args, 2127 struct nfs_fh *mntfh, 2128 const char *dev_name) 2129 { 2130 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2131 } 2132 #endif 2133 2134 static int nfs_validate_text_mount_data(void *options, 2135 struct nfs_parsed_mount_data *args, 2136 const char *dev_name) 2137 { 2138 int port = 0; 2139 int max_namelen = PAGE_SIZE; 2140 int max_pathlen = NFS_MAXPATHLEN; 2141 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2142 2143 if (nfs_parse_mount_options((char *)options, args) == 0) 2144 return -EINVAL; 2145 2146 if (!nfs_verify_server_address(sap)) 2147 goto out_no_address; 2148 2149 if (args->version == 4) { 2150 #if IS_ENABLED(CONFIG_NFS_V4) 2151 port = NFS_PORT; 2152 max_namelen = NFS4_MAXNAMLEN; 2153 max_pathlen = NFS4_MAXPATHLEN; 2154 nfs_validate_transport_protocol(args); 2155 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2156 goto out_invalid_transport_udp; 2157 nfs4_validate_mount_flags(args); 2158 #else 2159 goto out_v4_not_compiled; 2160 #endif /* CONFIG_NFS_V4 */ 2161 } else 2162 nfs_set_mount_transport_protocol(args); 2163 2164 nfs_set_port(sap, &args->nfs_server.port, port); 2165 2166 return nfs_parse_devname(dev_name, 2167 &args->nfs_server.hostname, 2168 max_namelen, 2169 &args->nfs_server.export_path, 2170 max_pathlen); 2171 2172 #if !IS_ENABLED(CONFIG_NFS_V4) 2173 out_v4_not_compiled: 2174 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2175 return -EPROTONOSUPPORT; 2176 #else 2177 out_invalid_transport_udp: 2178 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2179 return -EINVAL; 2180 #endif /* !CONFIG_NFS_V4 */ 2181 2182 out_no_address: 2183 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2184 return -EINVAL; 2185 } 2186 2187 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 2188 | NFS_MOUNT_SECURE \ 2189 | NFS_MOUNT_TCP \ 2190 | NFS_MOUNT_VER3 \ 2191 | NFS_MOUNT_KERBEROS \ 2192 | NFS_MOUNT_NONLM \ 2193 | NFS_MOUNT_BROKEN_SUID \ 2194 | NFS_MOUNT_STRICTLOCK \ 2195 | NFS_MOUNT_LEGACY_INTERFACE) 2196 2197 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 2198 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 2199 2200 static int 2201 nfs_compare_remount_data(struct nfs_server *nfss, 2202 struct nfs_parsed_mount_data *data) 2203 { 2204 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 2205 data->rsize != nfss->rsize || 2206 data->wsize != nfss->wsize || 2207 data->version != nfss->nfs_client->rpc_ops->version || 2208 data->minorversion != nfss->nfs_client->cl_minorversion || 2209 data->retrans != nfss->client->cl_timeout->to_retries || 2210 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) || 2211 data->acregmin != nfss->acregmin / HZ || 2212 data->acregmax != nfss->acregmax / HZ || 2213 data->acdirmin != nfss->acdirmin / HZ || 2214 data->acdirmax != nfss->acdirmax / HZ || 2215 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2216 data->nfs_server.port != nfss->port || 2217 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2218 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2219 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2220 return -EINVAL; 2221 2222 return 0; 2223 } 2224 2225 int 2226 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2227 { 2228 int error; 2229 struct nfs_server *nfss = sb->s_fs_info; 2230 struct nfs_parsed_mount_data *data; 2231 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2232 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2233 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2234 2235 sync_filesystem(sb); 2236 2237 /* 2238 * Userspace mount programs that send binary options generally send 2239 * them populated with default values. We have no way to know which 2240 * ones were explicitly specified. Fall back to legacy behavior and 2241 * just return success. 2242 */ 2243 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2244 (nfsvers <= 3 && (!options || (options->version >= 1 && 2245 options->version <= 6)))) 2246 return 0; 2247 2248 data = kzalloc(sizeof(*data), GFP_KERNEL); 2249 if (data == NULL) 2250 return -ENOMEM; 2251 2252 /* fill out struct with values from existing mount */ 2253 data->flags = nfss->flags; 2254 data->rsize = nfss->rsize; 2255 data->wsize = nfss->wsize; 2256 data->retrans = nfss->client->cl_timeout->to_retries; 2257 data->selected_flavor = nfss->client->cl_auth->au_flavor; 2258 data->acregmin = nfss->acregmin / HZ; 2259 data->acregmax = nfss->acregmax / HZ; 2260 data->acdirmin = nfss->acdirmin / HZ; 2261 data->acdirmax = nfss->acdirmax / HZ; 2262 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2263 data->nfs_server.port = nfss->port; 2264 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2265 data->version = nfsvers; 2266 data->minorversion = nfss->nfs_client->cl_minorversion; 2267 data->net = current->nsproxy->net_ns; 2268 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2269 data->nfs_server.addrlen); 2270 2271 /* overwrite those values with any that were specified */ 2272 error = -EINVAL; 2273 if (!nfs_parse_mount_options((char *)options, data)) 2274 goto out; 2275 2276 /* 2277 * noac is a special case. It implies -o sync, but that's not 2278 * necessarily reflected in the mtab options. do_remount_sb 2279 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2280 * remount options, so we have to explicitly reset it. 2281 */ 2282 if (data->flags & NFS_MOUNT_NOAC) 2283 *flags |= MS_SYNCHRONOUS; 2284 2285 /* compare new mount options with old ones */ 2286 error = nfs_compare_remount_data(nfss, data); 2287 out: 2288 kfree(data); 2289 return error; 2290 } 2291 EXPORT_SYMBOL_GPL(nfs_remount); 2292 2293 /* 2294 * Initialise the common bits of the superblock 2295 */ 2296 inline void nfs_initialise_sb(struct super_block *sb) 2297 { 2298 struct nfs_server *server = NFS_SB(sb); 2299 2300 sb->s_magic = NFS_SUPER_MAGIC; 2301 2302 /* We probably want something more informative here */ 2303 snprintf(sb->s_id, sizeof(sb->s_id), 2304 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2305 2306 if (sb->s_blocksize == 0) 2307 sb->s_blocksize = nfs_block_bits(server->wsize, 2308 &sb->s_blocksize_bits); 2309 2310 sb->s_bdi = &server->backing_dev_info; 2311 2312 nfs_super_set_maxbytes(sb, server->maxfilesize); 2313 } 2314 2315 /* 2316 * Finish setting up an NFS2/3 superblock 2317 */ 2318 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2319 { 2320 struct nfs_parsed_mount_data *data = mount_info->parsed; 2321 struct nfs_server *server = NFS_SB(sb); 2322 2323 sb->s_blocksize_bits = 0; 2324 sb->s_blocksize = 0; 2325 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2326 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2327 if (data && data->bsize) 2328 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2329 2330 if (server->nfs_client->rpc_ops->version != 2) { 2331 /* The VFS shouldn't apply the umask to mode bits. We will do 2332 * so ourselves when necessary. 2333 */ 2334 sb->s_flags |= MS_POSIXACL; 2335 sb->s_time_gran = 1; 2336 } 2337 2338 nfs_initialise_sb(sb); 2339 } 2340 EXPORT_SYMBOL_GPL(nfs_fill_super); 2341 2342 /* 2343 * Finish setting up a cloned NFS2/3/4 superblock 2344 */ 2345 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2346 { 2347 const struct super_block *old_sb = mount_info->cloned->sb; 2348 struct nfs_server *server = NFS_SB(sb); 2349 2350 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2351 sb->s_blocksize = old_sb->s_blocksize; 2352 sb->s_maxbytes = old_sb->s_maxbytes; 2353 sb->s_xattr = old_sb->s_xattr; 2354 sb->s_op = old_sb->s_op; 2355 sb->s_time_gran = 1; 2356 2357 if (server->nfs_client->rpc_ops->version != 2) { 2358 /* The VFS shouldn't apply the umask to mode bits. We will do 2359 * so ourselves when necessary. 2360 */ 2361 sb->s_flags |= MS_POSIXACL; 2362 } 2363 2364 nfs_initialise_sb(sb); 2365 } 2366 2367 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2368 { 2369 const struct nfs_server *a = s->s_fs_info; 2370 const struct rpc_clnt *clnt_a = a->client; 2371 const struct rpc_clnt *clnt_b = b->client; 2372 2373 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2374 goto Ebusy; 2375 if (a->nfs_client != b->nfs_client) 2376 goto Ebusy; 2377 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 2378 goto Ebusy; 2379 if (a->wsize != b->wsize) 2380 goto Ebusy; 2381 if (a->rsize != b->rsize) 2382 goto Ebusy; 2383 if (a->acregmin != b->acregmin) 2384 goto Ebusy; 2385 if (a->acregmax != b->acregmax) 2386 goto Ebusy; 2387 if (a->acdirmin != b->acdirmin) 2388 goto Ebusy; 2389 if (a->acdirmax != b->acdirmax) 2390 goto Ebusy; 2391 if (b->auth_info.flavor_len > 0 && 2392 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2393 goto Ebusy; 2394 return 1; 2395 Ebusy: 2396 return 0; 2397 } 2398 2399 struct nfs_sb_mountdata { 2400 struct nfs_server *server; 2401 int mntflags; 2402 }; 2403 2404 static int nfs_set_super(struct super_block *s, void *data) 2405 { 2406 struct nfs_sb_mountdata *sb_mntdata = data; 2407 struct nfs_server *server = sb_mntdata->server; 2408 int ret; 2409 2410 s->s_flags = sb_mntdata->mntflags; 2411 s->s_fs_info = server; 2412 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2413 ret = set_anon_super(s, server); 2414 if (ret == 0) 2415 server->s_dev = s->s_dev; 2416 return ret; 2417 } 2418 2419 static int nfs_compare_super_address(struct nfs_server *server1, 2420 struct nfs_server *server2) 2421 { 2422 struct sockaddr *sap1, *sap2; 2423 struct rpc_xprt *xprt1 = server1->client->cl_xprt; 2424 struct rpc_xprt *xprt2 = server2->client->cl_xprt; 2425 2426 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) 2427 return 0; 2428 2429 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2430 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2431 2432 if (sap1->sa_family != sap2->sa_family) 2433 return 0; 2434 2435 switch (sap1->sa_family) { 2436 case AF_INET: { 2437 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2438 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2439 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2440 return 0; 2441 if (sin1->sin_port != sin2->sin_port) 2442 return 0; 2443 break; 2444 } 2445 case AF_INET6: { 2446 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2447 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2448 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2449 return 0; 2450 if (sin1->sin6_port != sin2->sin6_port) 2451 return 0; 2452 break; 2453 } 2454 default: 2455 return 0; 2456 } 2457 2458 return 1; 2459 } 2460 2461 static int nfs_compare_super(struct super_block *sb, void *data) 2462 { 2463 struct nfs_sb_mountdata *sb_mntdata = data; 2464 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2465 int mntflags = sb_mntdata->mntflags; 2466 2467 if (!nfs_compare_super_address(old, server)) 2468 return 0; 2469 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2470 if (old->flags & NFS_MOUNT_UNSHARED) 2471 return 0; 2472 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2473 return 0; 2474 return nfs_compare_mount_options(sb, server, mntflags); 2475 } 2476 2477 #ifdef CONFIG_NFS_FSCACHE 2478 static void nfs_get_cache_cookie(struct super_block *sb, 2479 struct nfs_parsed_mount_data *parsed, 2480 struct nfs_clone_mount *cloned) 2481 { 2482 struct nfs_server *nfss = NFS_SB(sb); 2483 char *uniq = NULL; 2484 int ulen = 0; 2485 2486 nfss->fscache_key = NULL; 2487 nfss->fscache = NULL; 2488 2489 if (parsed) { 2490 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2491 return; 2492 if (parsed->fscache_uniq) { 2493 uniq = parsed->fscache_uniq; 2494 ulen = strlen(parsed->fscache_uniq); 2495 } 2496 } else if (cloned) { 2497 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2498 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2499 return; 2500 if (mnt_s->fscache_key) { 2501 uniq = mnt_s->fscache_key->key.uniquifier; 2502 ulen = mnt_s->fscache_key->key.uniq_len; 2503 }; 2504 } else 2505 return; 2506 2507 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2508 } 2509 #else 2510 static void nfs_get_cache_cookie(struct super_block *sb, 2511 struct nfs_parsed_mount_data *parsed, 2512 struct nfs_clone_mount *cloned) 2513 { 2514 } 2515 #endif 2516 2517 static int nfs_bdi_register(struct nfs_server *server) 2518 { 2519 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2520 } 2521 2522 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2523 struct nfs_mount_info *mount_info) 2524 { 2525 int error; 2526 unsigned long kflags = 0, kflags_out = 0; 2527 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2528 kflags |= SECURITY_LSM_NATIVE_LABELS; 2529 2530 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts, 2531 kflags, &kflags_out); 2532 if (error) 2533 goto err; 2534 2535 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2536 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2537 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2538 err: 2539 return error; 2540 } 2541 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2542 2543 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2544 struct nfs_mount_info *mount_info) 2545 { 2546 /* clone any lsm security options from the parent to the new sb */ 2547 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2548 return -ESTALE; 2549 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2550 } 2551 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2552 2553 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2554 int flags, const char *dev_name, 2555 struct nfs_mount_info *mount_info, 2556 struct nfs_subversion *nfs_mod) 2557 { 2558 struct super_block *s; 2559 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2560 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2561 struct nfs_sb_mountdata sb_mntdata = { 2562 .mntflags = flags, 2563 .server = server, 2564 }; 2565 int error; 2566 2567 if (server->flags & NFS_MOUNT_UNSHARED) 2568 compare_super = NULL; 2569 2570 /* -o noac implies -o sync */ 2571 if (server->flags & NFS_MOUNT_NOAC) 2572 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2573 2574 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) 2575 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS) 2576 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2577 2578 /* Get a superblock - note that we may end up sharing one that already exists */ 2579 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2580 if (IS_ERR(s)) { 2581 mntroot = ERR_CAST(s); 2582 goto out_err_nosb; 2583 } 2584 2585 if (s->s_fs_info != server) { 2586 nfs_free_server(server); 2587 server = NULL; 2588 } else { 2589 error = nfs_bdi_register(server); 2590 if (error) { 2591 mntroot = ERR_PTR(error); 2592 goto error_splat_super; 2593 } 2594 server->super = s; 2595 } 2596 2597 if (!s->s_root) { 2598 /* initial superblock/root creation */ 2599 mount_info->fill_super(s, mount_info); 2600 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2601 } 2602 2603 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2604 if (IS_ERR(mntroot)) 2605 goto error_splat_super; 2606 2607 error = mount_info->set_security(s, mntroot, mount_info); 2608 if (error) 2609 goto error_splat_root; 2610 2611 s->s_flags |= MS_ACTIVE; 2612 2613 out: 2614 return mntroot; 2615 2616 out_err_nosb: 2617 nfs_free_server(server); 2618 goto out; 2619 2620 error_splat_root: 2621 dput(mntroot); 2622 mntroot = ERR_PTR(error); 2623 error_splat_super: 2624 deactivate_locked_super(s); 2625 goto out; 2626 } 2627 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2628 2629 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2630 int flags, const char *dev_name, void *raw_data) 2631 { 2632 struct nfs_mount_info mount_info = { 2633 .fill_super = nfs_fill_super, 2634 .set_security = nfs_set_sb_security, 2635 }; 2636 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2637 struct nfs_subversion *nfs_mod; 2638 int error; 2639 2640 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2641 mount_info.mntfh = nfs_alloc_fhandle(); 2642 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2643 goto out; 2644 2645 /* Validate the mount data */ 2646 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2647 if (error == NFS_TEXT_DATA) 2648 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2649 if (error < 0) { 2650 mntroot = ERR_PTR(error); 2651 goto out; 2652 } 2653 2654 nfs_mod = get_nfs_version(mount_info.parsed->version); 2655 if (IS_ERR(nfs_mod)) { 2656 mntroot = ERR_CAST(nfs_mod); 2657 goto out; 2658 } 2659 2660 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2661 2662 put_nfs_version(nfs_mod); 2663 out: 2664 nfs_free_parsed_mount_data(mount_info.parsed); 2665 nfs_free_fhandle(mount_info.mntfh); 2666 return mntroot; 2667 } 2668 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2669 2670 /* 2671 * Destroy an NFS2/3 superblock 2672 */ 2673 void nfs_kill_super(struct super_block *s) 2674 { 2675 struct nfs_server *server = NFS_SB(s); 2676 dev_t dev = s->s_dev; 2677 2678 generic_shutdown_super(s); 2679 2680 nfs_fscache_release_super_cookie(s); 2681 2682 nfs_free_server(server); 2683 free_anon_bdev(dev); 2684 } 2685 EXPORT_SYMBOL_GPL(nfs_kill_super); 2686 2687 /* 2688 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2689 */ 2690 static struct dentry * 2691 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2692 const char *dev_name, void *raw_data) 2693 { 2694 struct nfs_clone_mount *data = raw_data; 2695 struct nfs_mount_info mount_info = { 2696 .fill_super = nfs_clone_super, 2697 .set_security = nfs_clone_sb_security, 2698 .cloned = data, 2699 }; 2700 struct nfs_server *server; 2701 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2702 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2703 2704 dprintk("--> nfs_xdev_mount()\n"); 2705 2706 mount_info.mntfh = mount_info.cloned->fh; 2707 2708 /* create a new volume representation */ 2709 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2710 2711 if (IS_ERR(server)) 2712 mntroot = ERR_CAST(server); 2713 else 2714 mntroot = nfs_fs_mount_common(server, flags, 2715 dev_name, &mount_info, nfs_mod); 2716 2717 dprintk("<-- nfs_xdev_mount() = %ld\n", 2718 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2719 return mntroot; 2720 } 2721 2722 #if IS_ENABLED(CONFIG_NFS_V4) 2723 2724 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2725 { 2726 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2727 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2728 } 2729 2730 /* 2731 * Validate NFSv4 mount options 2732 */ 2733 static int nfs4_validate_mount_data(void *options, 2734 struct nfs_parsed_mount_data *args, 2735 const char *dev_name) 2736 { 2737 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2738 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2739 char *c; 2740 2741 if (data == NULL) 2742 goto out_no_data; 2743 2744 args->version = 4; 2745 2746 switch (data->version) { 2747 case 1: 2748 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2749 goto out_no_address; 2750 if (data->host_addrlen == 0) 2751 goto out_no_address; 2752 args->nfs_server.addrlen = data->host_addrlen; 2753 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2754 return -EFAULT; 2755 if (!nfs_verify_server_address(sap)) 2756 goto out_no_address; 2757 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2758 2759 if (data->auth_flavourlen) { 2760 rpc_authflavor_t pseudoflavor; 2761 if (data->auth_flavourlen > 1) 2762 goto out_inval_auth; 2763 if (copy_from_user(&pseudoflavor, 2764 data->auth_flavours, 2765 sizeof(pseudoflavor))) 2766 return -EFAULT; 2767 args->selected_flavor = pseudoflavor; 2768 } else 2769 args->selected_flavor = RPC_AUTH_UNIX; 2770 2771 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2772 if (IS_ERR(c)) 2773 return PTR_ERR(c); 2774 args->nfs_server.hostname = c; 2775 2776 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2777 if (IS_ERR(c)) 2778 return PTR_ERR(c); 2779 args->nfs_server.export_path = c; 2780 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2781 2782 c = strndup_user(data->client_addr.data, 16); 2783 if (IS_ERR(c)) 2784 return PTR_ERR(c); 2785 args->client_address = c; 2786 2787 /* 2788 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2789 * can deal with. 2790 */ 2791 2792 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2793 args->rsize = data->rsize; 2794 args->wsize = data->wsize; 2795 args->timeo = data->timeo; 2796 args->retrans = data->retrans; 2797 args->acregmin = data->acregmin; 2798 args->acregmax = data->acregmax; 2799 args->acdirmin = data->acdirmin; 2800 args->acdirmax = data->acdirmax; 2801 args->nfs_server.protocol = data->proto; 2802 nfs_validate_transport_protocol(args); 2803 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2804 goto out_invalid_transport_udp; 2805 2806 break; 2807 default: 2808 return NFS_TEXT_DATA; 2809 } 2810 2811 return 0; 2812 2813 out_no_data: 2814 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2815 return -EINVAL; 2816 2817 out_inval_auth: 2818 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2819 data->auth_flavourlen); 2820 return -EINVAL; 2821 2822 out_no_address: 2823 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2824 return -EINVAL; 2825 2826 out_invalid_transport_udp: 2827 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2828 return -EINVAL; 2829 } 2830 2831 /* 2832 * NFS v4 module parameters need to stay in the 2833 * NFS client for backwards compatibility 2834 */ 2835 unsigned int nfs_callback_set_tcpport; 2836 /* Default cache timeout is 10 minutes */ 2837 unsigned int nfs_idmap_cache_timeout = 600; 2838 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2839 bool nfs4_disable_idmapping = true; 2840 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2841 unsigned short send_implementation_id = 1; 2842 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2843 bool recover_lost_locks = false; 2844 2845 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2846 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2847 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2848 EXPORT_SYMBOL_GPL(max_session_slots); 2849 EXPORT_SYMBOL_GPL(send_implementation_id); 2850 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2851 EXPORT_SYMBOL_GPL(recover_lost_locks); 2852 2853 #define NFS_CALLBACK_MAXPORTNR (65535U) 2854 2855 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2856 { 2857 unsigned long num; 2858 int ret; 2859 2860 if (!val) 2861 return -EINVAL; 2862 ret = kstrtoul(val, 0, &num); 2863 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2864 return -EINVAL; 2865 *((unsigned int *)kp->arg) = num; 2866 return 0; 2867 } 2868 static const struct kernel_param_ops param_ops_portnr = { 2869 .set = param_set_portnr, 2870 .get = param_get_uint, 2871 }; 2872 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2873 2874 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2875 module_param(nfs_idmap_cache_timeout, int, 0644); 2876 module_param(nfs4_disable_idmapping, bool, 0644); 2877 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2878 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2879 MODULE_PARM_DESC(nfs4_disable_idmapping, 2880 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2881 module_param(max_session_slots, ushort, 0644); 2882 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2883 "requests the client will negotiate"); 2884 module_param(send_implementation_id, ushort, 0644); 2885 MODULE_PARM_DESC(send_implementation_id, 2886 "Send implementation ID with NFSv4.1 exchange_id"); 2887 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2888 2889 module_param(recover_lost_locks, bool, 0644); 2890 MODULE_PARM_DESC(recover_lost_locks, 2891 "If the server reports that a lock might be lost, " 2892 "try to recover it risking data corruption."); 2893 2894 2895 #endif /* CONFIG_NFS_V4 */ 2896