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->timeo = NFS_UNSPEC_TIMEO; 927 data->retrans = NFS_UNSPEC_RETRANS; 928 data->acregmin = NFS_DEF_ACREGMIN; 929 data->acregmax = NFS_DEF_ACREGMAX; 930 data->acdirmin = NFS_DEF_ACDIRMIN; 931 data->acdirmax = NFS_DEF_ACDIRMAX; 932 data->mount_server.port = NFS_UNSPEC_PORT; 933 data->nfs_server.port = NFS_UNSPEC_PORT; 934 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 935 data->selected_flavor = RPC_AUTH_MAXFLAVOR; 936 data->minorversion = 0; 937 data->need_mount = true; 938 data->net = current->nsproxy->net_ns; 939 security_init_mnt_opts(&data->lsm_opts); 940 } 941 return data; 942 } 943 944 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 945 { 946 if (data) { 947 kfree(data->client_address); 948 kfree(data->mount_server.hostname); 949 kfree(data->nfs_server.export_path); 950 kfree(data->nfs_server.hostname); 951 kfree(data->fscache_uniq); 952 security_free_mnt_opts(&data->lsm_opts); 953 kfree(data); 954 } 955 } 956 957 /* 958 * Sanity-check a server address provided by the mount command. 959 * 960 * Address family must be initialized, and address must not be 961 * the ANY address for that family. 962 */ 963 static int nfs_verify_server_address(struct sockaddr *addr) 964 { 965 switch (addr->sa_family) { 966 case AF_INET: { 967 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 968 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 969 } 970 case AF_INET6: { 971 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 972 return !ipv6_addr_any(sa); 973 } 974 } 975 976 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 977 return 0; 978 } 979 980 /* 981 * Select between a default port value and a user-specified port value. 982 * If a zero value is set, then autobind will be used. 983 */ 984 static void nfs_set_port(struct sockaddr *sap, int *port, 985 const unsigned short default_port) 986 { 987 if (*port == NFS_UNSPEC_PORT) 988 *port = default_port; 989 990 rpc_set_port(sap, *port); 991 } 992 993 /* 994 * Sanity check the NFS transport protocol. 995 * 996 */ 997 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 998 { 999 switch (mnt->nfs_server.protocol) { 1000 case XPRT_TRANSPORT_UDP: 1001 case XPRT_TRANSPORT_TCP: 1002 case XPRT_TRANSPORT_RDMA: 1003 break; 1004 default: 1005 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1006 } 1007 } 1008 1009 /* 1010 * For text based NFSv2/v3 mounts, the mount protocol transport default 1011 * settings should depend upon the specified NFS transport. 1012 */ 1013 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1014 { 1015 nfs_validate_transport_protocol(mnt); 1016 1017 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1018 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1019 return; 1020 switch (mnt->nfs_server.protocol) { 1021 case XPRT_TRANSPORT_UDP: 1022 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1023 break; 1024 case XPRT_TRANSPORT_TCP: 1025 case XPRT_TRANSPORT_RDMA: 1026 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1027 } 1028 } 1029 1030 /* 1031 * Add 'flavor' to 'auth_info' if not already present. 1032 * Returns true if 'flavor' ends up in the list, false otherwise 1033 */ 1034 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, 1035 rpc_authflavor_t flavor) 1036 { 1037 unsigned int i; 1038 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors); 1039 1040 /* make sure this flavor isn't already in the list */ 1041 for (i = 0; i < auth_info->flavor_len; i++) { 1042 if (flavor == auth_info->flavors[i]) 1043 return true; 1044 } 1045 1046 if (auth_info->flavor_len + 1 >= max_flavor_len) { 1047 dfprintk(MOUNT, "NFS: too many sec= flavors\n"); 1048 return false; 1049 } 1050 1051 auth_info->flavors[auth_info->flavor_len++] = flavor; 1052 return true; 1053 } 1054 1055 /* 1056 * Return true if 'match' is in auth_info or auth_info is empty. 1057 * Return false otherwise. 1058 */ 1059 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, 1060 rpc_authflavor_t match) 1061 { 1062 int i; 1063 1064 if (!auth_info->flavor_len) 1065 return true; 1066 1067 for (i = 0; i < auth_info->flavor_len; i++) { 1068 if (auth_info->flavors[i] == match) 1069 return true; 1070 } 1071 return false; 1072 } 1073 EXPORT_SYMBOL_GPL(nfs_auth_info_match); 1074 1075 /* 1076 * Parse the value of the 'sec=' option. 1077 */ 1078 static int nfs_parse_security_flavors(char *value, 1079 struct nfs_parsed_mount_data *mnt) 1080 { 1081 substring_t args[MAX_OPT_ARGS]; 1082 rpc_authflavor_t pseudoflavor; 1083 char *p; 1084 1085 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1086 1087 while ((p = strsep(&value, ":")) != NULL) { 1088 switch (match_token(p, nfs_secflavor_tokens, args)) { 1089 case Opt_sec_none: 1090 pseudoflavor = RPC_AUTH_NULL; 1091 break; 1092 case Opt_sec_sys: 1093 pseudoflavor = RPC_AUTH_UNIX; 1094 break; 1095 case Opt_sec_krb5: 1096 pseudoflavor = RPC_AUTH_GSS_KRB5; 1097 break; 1098 case Opt_sec_krb5i: 1099 pseudoflavor = RPC_AUTH_GSS_KRB5I; 1100 break; 1101 case Opt_sec_krb5p: 1102 pseudoflavor = RPC_AUTH_GSS_KRB5P; 1103 break; 1104 case Opt_sec_lkey: 1105 pseudoflavor = RPC_AUTH_GSS_LKEY; 1106 break; 1107 case Opt_sec_lkeyi: 1108 pseudoflavor = RPC_AUTH_GSS_LKEYI; 1109 break; 1110 case Opt_sec_lkeyp: 1111 pseudoflavor = RPC_AUTH_GSS_LKEYP; 1112 break; 1113 case Opt_sec_spkm: 1114 pseudoflavor = RPC_AUTH_GSS_SPKM; 1115 break; 1116 case Opt_sec_spkmi: 1117 pseudoflavor = RPC_AUTH_GSS_SPKMI; 1118 break; 1119 case Opt_sec_spkmp: 1120 pseudoflavor = RPC_AUTH_GSS_SPKMP; 1121 break; 1122 default: 1123 dfprintk(MOUNT, 1124 "NFS: sec= option '%s' not recognized\n", p); 1125 return 0; 1126 } 1127 1128 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor)) 1129 return 0; 1130 } 1131 1132 return 1; 1133 } 1134 1135 static int nfs_parse_version_string(char *string, 1136 struct nfs_parsed_mount_data *mnt, 1137 substring_t *args) 1138 { 1139 mnt->flags &= ~NFS_MOUNT_VER3; 1140 switch (match_token(string, nfs_vers_tokens, args)) { 1141 case Opt_vers_2: 1142 mnt->version = 2; 1143 break; 1144 case Opt_vers_3: 1145 mnt->flags |= NFS_MOUNT_VER3; 1146 mnt->version = 3; 1147 break; 1148 case Opt_vers_4: 1149 /* Backward compatibility option. In future, 1150 * the mount program should always supply 1151 * a NFSv4 minor version number. 1152 */ 1153 mnt->version = 4; 1154 break; 1155 case Opt_vers_4_0: 1156 mnt->version = 4; 1157 mnt->minorversion = 0; 1158 break; 1159 case Opt_vers_4_1: 1160 mnt->version = 4; 1161 mnt->minorversion = 1; 1162 break; 1163 case Opt_vers_4_2: 1164 mnt->version = 4; 1165 mnt->minorversion = 2; 1166 break; 1167 default: 1168 return 0; 1169 } 1170 return 1; 1171 } 1172 1173 static int nfs_get_option_str(substring_t args[], char **option) 1174 { 1175 kfree(*option); 1176 *option = match_strdup(args); 1177 return !*option; 1178 } 1179 1180 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1181 { 1182 int rc; 1183 char *string; 1184 1185 string = match_strdup(args); 1186 if (string == NULL) 1187 return -ENOMEM; 1188 rc = kstrtoul(string, 10, option); 1189 kfree(string); 1190 1191 return rc; 1192 } 1193 1194 static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option, 1195 unsigned long l_bound, unsigned long u_bound) 1196 { 1197 int ret; 1198 1199 ret = nfs_get_option_ul(args, option); 1200 if (ret != 0) 1201 return ret; 1202 if (*option < l_bound || *option > u_bound) 1203 return -ERANGE; 1204 return 0; 1205 } 1206 1207 /* 1208 * Error-check and convert a string of mount options from user space into 1209 * a data structure. The whole mount string is processed; bad options are 1210 * skipped as they are encountered. If there were no errors, return 1; 1211 * otherwise return 0 (zero). 1212 */ 1213 static int nfs_parse_mount_options(char *raw, 1214 struct nfs_parsed_mount_data *mnt) 1215 { 1216 char *p, *string, *secdata; 1217 int rc, sloppy = 0, invalid_option = 0; 1218 unsigned short protofamily = AF_UNSPEC; 1219 unsigned short mountfamily = AF_UNSPEC; 1220 1221 if (!raw) { 1222 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1223 return 1; 1224 } 1225 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1226 1227 secdata = alloc_secdata(); 1228 if (!secdata) 1229 goto out_nomem; 1230 1231 rc = security_sb_copy_data(raw, secdata); 1232 if (rc) 1233 goto out_security_failure; 1234 1235 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1236 if (rc) 1237 goto out_security_failure; 1238 1239 free_secdata(secdata); 1240 1241 while ((p = strsep(&raw, ",")) != NULL) { 1242 substring_t args[MAX_OPT_ARGS]; 1243 unsigned long option; 1244 int token; 1245 1246 if (!*p) 1247 continue; 1248 1249 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1250 1251 token = match_token(p, nfs_mount_option_tokens, args); 1252 switch (token) { 1253 1254 /* 1255 * boolean options: foo/nofoo 1256 */ 1257 case Opt_soft: 1258 mnt->flags |= NFS_MOUNT_SOFT; 1259 break; 1260 case Opt_hard: 1261 mnt->flags &= ~NFS_MOUNT_SOFT; 1262 break; 1263 case Opt_posix: 1264 mnt->flags |= NFS_MOUNT_POSIX; 1265 break; 1266 case Opt_noposix: 1267 mnt->flags &= ~NFS_MOUNT_POSIX; 1268 break; 1269 case Opt_cto: 1270 mnt->flags &= ~NFS_MOUNT_NOCTO; 1271 break; 1272 case Opt_nocto: 1273 mnt->flags |= NFS_MOUNT_NOCTO; 1274 break; 1275 case Opt_ac: 1276 mnt->flags &= ~NFS_MOUNT_NOAC; 1277 break; 1278 case Opt_noac: 1279 mnt->flags |= NFS_MOUNT_NOAC; 1280 break; 1281 case Opt_lock: 1282 mnt->flags &= ~NFS_MOUNT_NONLM; 1283 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1284 NFS_MOUNT_LOCAL_FCNTL); 1285 break; 1286 case Opt_nolock: 1287 mnt->flags |= NFS_MOUNT_NONLM; 1288 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1289 NFS_MOUNT_LOCAL_FCNTL); 1290 break; 1291 case Opt_udp: 1292 mnt->flags &= ~NFS_MOUNT_TCP; 1293 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1294 break; 1295 case Opt_tcp: 1296 mnt->flags |= NFS_MOUNT_TCP; 1297 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1298 break; 1299 case Opt_rdma: 1300 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1301 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1302 xprt_load_transport(p); 1303 break; 1304 case Opt_acl: 1305 mnt->flags &= ~NFS_MOUNT_NOACL; 1306 break; 1307 case Opt_noacl: 1308 mnt->flags |= NFS_MOUNT_NOACL; 1309 break; 1310 case Opt_rdirplus: 1311 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1312 break; 1313 case Opt_nordirplus: 1314 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1315 break; 1316 case Opt_sharecache: 1317 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1318 break; 1319 case Opt_nosharecache: 1320 mnt->flags |= NFS_MOUNT_UNSHARED; 1321 break; 1322 case Opt_resvport: 1323 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1324 break; 1325 case Opt_noresvport: 1326 mnt->flags |= NFS_MOUNT_NORESVPORT; 1327 break; 1328 case Opt_fscache: 1329 mnt->options |= NFS_OPTION_FSCACHE; 1330 kfree(mnt->fscache_uniq); 1331 mnt->fscache_uniq = NULL; 1332 break; 1333 case Opt_nofscache: 1334 mnt->options &= ~NFS_OPTION_FSCACHE; 1335 kfree(mnt->fscache_uniq); 1336 mnt->fscache_uniq = NULL; 1337 break; 1338 case Opt_migration: 1339 mnt->options |= NFS_OPTION_MIGRATION; 1340 break; 1341 case Opt_nomigration: 1342 mnt->options &= NFS_OPTION_MIGRATION; 1343 break; 1344 1345 /* 1346 * options that take numeric values 1347 */ 1348 case Opt_port: 1349 if (nfs_get_option_ul(args, &option) || 1350 option > USHRT_MAX) 1351 goto out_invalid_value; 1352 mnt->nfs_server.port = option; 1353 break; 1354 case Opt_rsize: 1355 if (nfs_get_option_ul(args, &option)) 1356 goto out_invalid_value; 1357 mnt->rsize = option; 1358 break; 1359 case Opt_wsize: 1360 if (nfs_get_option_ul(args, &option)) 1361 goto out_invalid_value; 1362 mnt->wsize = option; 1363 break; 1364 case Opt_bsize: 1365 if (nfs_get_option_ul(args, &option)) 1366 goto out_invalid_value; 1367 mnt->bsize = option; 1368 break; 1369 case Opt_timeo: 1370 if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX)) 1371 goto out_invalid_value; 1372 mnt->timeo = option; 1373 break; 1374 case Opt_retrans: 1375 if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX)) 1376 goto out_invalid_value; 1377 mnt->retrans = option; 1378 break; 1379 case Opt_acregmin: 1380 if (nfs_get_option_ul(args, &option)) 1381 goto out_invalid_value; 1382 mnt->acregmin = option; 1383 break; 1384 case Opt_acregmax: 1385 if (nfs_get_option_ul(args, &option)) 1386 goto out_invalid_value; 1387 mnt->acregmax = option; 1388 break; 1389 case Opt_acdirmin: 1390 if (nfs_get_option_ul(args, &option)) 1391 goto out_invalid_value; 1392 mnt->acdirmin = option; 1393 break; 1394 case Opt_acdirmax: 1395 if (nfs_get_option_ul(args, &option)) 1396 goto out_invalid_value; 1397 mnt->acdirmax = option; 1398 break; 1399 case Opt_actimeo: 1400 if (nfs_get_option_ul(args, &option)) 1401 goto out_invalid_value; 1402 mnt->acregmin = mnt->acregmax = 1403 mnt->acdirmin = mnt->acdirmax = option; 1404 break; 1405 case Opt_namelen: 1406 if (nfs_get_option_ul(args, &option)) 1407 goto out_invalid_value; 1408 mnt->namlen = option; 1409 break; 1410 case Opt_mountport: 1411 if (nfs_get_option_ul(args, &option) || 1412 option > USHRT_MAX) 1413 goto out_invalid_value; 1414 mnt->mount_server.port = option; 1415 break; 1416 case Opt_mountvers: 1417 if (nfs_get_option_ul(args, &option) || 1418 option < NFS_MNT_VERSION || 1419 option > NFS_MNT3_VERSION) 1420 goto out_invalid_value; 1421 mnt->mount_server.version = option; 1422 break; 1423 case Opt_minorversion: 1424 if (nfs_get_option_ul(args, &option)) 1425 goto out_invalid_value; 1426 if (option > NFS4_MAX_MINOR_VERSION) 1427 goto out_invalid_value; 1428 mnt->minorversion = option; 1429 break; 1430 1431 /* 1432 * options that take text values 1433 */ 1434 case Opt_nfsvers: 1435 string = match_strdup(args); 1436 if (string == NULL) 1437 goto out_nomem; 1438 rc = nfs_parse_version_string(string, mnt, args); 1439 kfree(string); 1440 if (!rc) 1441 goto out_invalid_value; 1442 break; 1443 case Opt_sec: 1444 string = match_strdup(args); 1445 if (string == NULL) 1446 goto out_nomem; 1447 rc = nfs_parse_security_flavors(string, mnt); 1448 kfree(string); 1449 if (!rc) { 1450 dfprintk(MOUNT, "NFS: unrecognized " 1451 "security flavor\n"); 1452 return 0; 1453 } 1454 break; 1455 case Opt_proto: 1456 string = match_strdup(args); 1457 if (string == NULL) 1458 goto out_nomem; 1459 token = match_token(string, 1460 nfs_xprt_protocol_tokens, args); 1461 1462 protofamily = AF_INET; 1463 switch (token) { 1464 case Opt_xprt_udp6: 1465 protofamily = AF_INET6; 1466 case Opt_xprt_udp: 1467 mnt->flags &= ~NFS_MOUNT_TCP; 1468 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1469 break; 1470 case Opt_xprt_tcp6: 1471 protofamily = AF_INET6; 1472 case Opt_xprt_tcp: 1473 mnt->flags |= NFS_MOUNT_TCP; 1474 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1475 break; 1476 case Opt_xprt_rdma6: 1477 protofamily = AF_INET6; 1478 case Opt_xprt_rdma: 1479 /* vector side protocols to TCP */ 1480 mnt->flags |= NFS_MOUNT_TCP; 1481 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1482 xprt_load_transport(string); 1483 break; 1484 default: 1485 dfprintk(MOUNT, "NFS: unrecognized " 1486 "transport protocol\n"); 1487 kfree(string); 1488 return 0; 1489 } 1490 kfree(string); 1491 break; 1492 case Opt_mountproto: 1493 string = match_strdup(args); 1494 if (string == NULL) 1495 goto out_nomem; 1496 token = match_token(string, 1497 nfs_xprt_protocol_tokens, args); 1498 kfree(string); 1499 1500 mountfamily = AF_INET; 1501 switch (token) { 1502 case Opt_xprt_udp6: 1503 mountfamily = AF_INET6; 1504 case Opt_xprt_udp: 1505 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1506 break; 1507 case Opt_xprt_tcp6: 1508 mountfamily = AF_INET6; 1509 case Opt_xprt_tcp: 1510 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1511 break; 1512 case Opt_xprt_rdma: /* not used for side protocols */ 1513 default: 1514 dfprintk(MOUNT, "NFS: unrecognized " 1515 "transport protocol\n"); 1516 return 0; 1517 } 1518 break; 1519 case Opt_addr: 1520 string = match_strdup(args); 1521 if (string == NULL) 1522 goto out_nomem; 1523 mnt->nfs_server.addrlen = 1524 rpc_pton(mnt->net, string, strlen(string), 1525 (struct sockaddr *) 1526 &mnt->nfs_server.address, 1527 sizeof(mnt->nfs_server.address)); 1528 kfree(string); 1529 if (mnt->nfs_server.addrlen == 0) 1530 goto out_invalid_address; 1531 break; 1532 case Opt_clientaddr: 1533 if (nfs_get_option_str(args, &mnt->client_address)) 1534 goto out_nomem; 1535 break; 1536 case Opt_mounthost: 1537 if (nfs_get_option_str(args, 1538 &mnt->mount_server.hostname)) 1539 goto out_nomem; 1540 break; 1541 case Opt_mountaddr: 1542 string = match_strdup(args); 1543 if (string == NULL) 1544 goto out_nomem; 1545 mnt->mount_server.addrlen = 1546 rpc_pton(mnt->net, string, strlen(string), 1547 (struct sockaddr *) 1548 &mnt->mount_server.address, 1549 sizeof(mnt->mount_server.address)); 1550 kfree(string); 1551 if (mnt->mount_server.addrlen == 0) 1552 goto out_invalid_address; 1553 break; 1554 case Opt_lookupcache: 1555 string = match_strdup(args); 1556 if (string == NULL) 1557 goto out_nomem; 1558 token = match_token(string, 1559 nfs_lookupcache_tokens, args); 1560 kfree(string); 1561 switch (token) { 1562 case Opt_lookupcache_all: 1563 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1564 break; 1565 case Opt_lookupcache_positive: 1566 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1567 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1568 break; 1569 case Opt_lookupcache_none: 1570 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1571 break; 1572 default: 1573 dfprintk(MOUNT, "NFS: invalid " 1574 "lookupcache argument\n"); 1575 return 0; 1576 }; 1577 break; 1578 case Opt_fscache_uniq: 1579 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1580 goto out_nomem; 1581 mnt->options |= NFS_OPTION_FSCACHE; 1582 break; 1583 case Opt_local_lock: 1584 string = match_strdup(args); 1585 if (string == NULL) 1586 goto out_nomem; 1587 token = match_token(string, nfs_local_lock_tokens, 1588 args); 1589 kfree(string); 1590 switch (token) { 1591 case Opt_local_lock_all: 1592 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1593 NFS_MOUNT_LOCAL_FCNTL); 1594 break; 1595 case Opt_local_lock_flock: 1596 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1597 break; 1598 case Opt_local_lock_posix: 1599 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1600 break; 1601 case Opt_local_lock_none: 1602 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1603 NFS_MOUNT_LOCAL_FCNTL); 1604 break; 1605 default: 1606 dfprintk(MOUNT, "NFS: invalid " 1607 "local_lock argument\n"); 1608 return 0; 1609 }; 1610 break; 1611 1612 /* 1613 * Special options 1614 */ 1615 case Opt_sloppy: 1616 sloppy = 1; 1617 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1618 break; 1619 case Opt_userspace: 1620 case Opt_deprecated: 1621 dfprintk(MOUNT, "NFS: ignoring mount option " 1622 "'%s'\n", p); 1623 break; 1624 1625 default: 1626 invalid_option = 1; 1627 dfprintk(MOUNT, "NFS: unrecognized mount option " 1628 "'%s'\n", p); 1629 } 1630 } 1631 1632 if (!sloppy && invalid_option) 1633 return 0; 1634 1635 if (mnt->minorversion && mnt->version != 4) 1636 goto out_minorversion_mismatch; 1637 1638 if (mnt->options & NFS_OPTION_MIGRATION && 1639 (mnt->version != 4 || mnt->minorversion != 0)) 1640 goto out_migration_misuse; 1641 1642 /* 1643 * verify that any proto=/mountproto= options match the address 1644 * families in the addr=/mountaddr= options. 1645 */ 1646 if (protofamily != AF_UNSPEC && 1647 protofamily != mnt->nfs_server.address.ss_family) 1648 goto out_proto_mismatch; 1649 1650 if (mountfamily != AF_UNSPEC) { 1651 if (mnt->mount_server.addrlen) { 1652 if (mountfamily != mnt->mount_server.address.ss_family) 1653 goto out_mountproto_mismatch; 1654 } else { 1655 if (mountfamily != mnt->nfs_server.address.ss_family) 1656 goto out_mountproto_mismatch; 1657 } 1658 } 1659 1660 return 1; 1661 1662 out_mountproto_mismatch: 1663 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1664 "option\n"); 1665 return 0; 1666 out_proto_mismatch: 1667 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1668 return 0; 1669 out_invalid_address: 1670 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1671 return 0; 1672 out_invalid_value: 1673 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1674 return 0; 1675 out_minorversion_mismatch: 1676 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1677 "minorversion=%u\n", mnt->version, mnt->minorversion); 1678 return 0; 1679 out_migration_misuse: 1680 printk(KERN_INFO 1681 "NFS: 'migration' not supported for this NFS version\n"); 1682 return 0; 1683 out_nomem: 1684 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1685 return 0; 1686 out_security_failure: 1687 free_secdata(secdata); 1688 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1689 return 0; 1690 } 1691 1692 /* 1693 * Ensure that a specified authtype in args->auth_info is supported by 1694 * the server. Returns 0 and sets args->selected_flavor if it's ok, and 1695 * -EACCES if not. 1696 */ 1697 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args, 1698 rpc_authflavor_t *server_authlist, unsigned int count) 1699 { 1700 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 1701 unsigned int i; 1702 int use_auth_null = false; 1703 1704 /* 1705 * If the sec= mount option is used, the specified flavor or AUTH_NULL 1706 * must be in the list returned by the server. 1707 * 1708 * AUTH_NULL has a special meaning when it's in the server list - it 1709 * means that the server will ignore the rpc creds, so any flavor 1710 * can be used but still use the sec= that was specified. 1711 */ 1712 for (i = 0; i < count; i++) { 1713 flavor = server_authlist[i]; 1714 1715 if (nfs_auth_info_match(&args->auth_info, flavor)) 1716 goto out; 1717 1718 if (flavor == RPC_AUTH_NULL) 1719 use_auth_null = true; 1720 } 1721 1722 if (use_auth_null) { 1723 flavor = RPC_AUTH_NULL; 1724 goto out; 1725 } 1726 1727 dfprintk(MOUNT, 1728 "NFS: specified auth flavors not supported by server\n"); 1729 return -EACCES; 1730 1731 out: 1732 args->selected_flavor = flavor; 1733 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor); 1734 return 0; 1735 } 1736 1737 /* 1738 * Use the remote server's MOUNT service to request the NFS file handle 1739 * corresponding to the provided path. 1740 */ 1741 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1742 struct nfs_fh *root_fh, 1743 rpc_authflavor_t *server_authlist, 1744 unsigned int *server_authlist_len) 1745 { 1746 struct nfs_mount_request request = { 1747 .sap = (struct sockaddr *) 1748 &args->mount_server.address, 1749 .dirpath = args->nfs_server.export_path, 1750 .protocol = args->mount_server.protocol, 1751 .fh = root_fh, 1752 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1753 .auth_flav_len = server_authlist_len, 1754 .auth_flavs = server_authlist, 1755 .net = args->net, 1756 }; 1757 int status; 1758 1759 if (args->mount_server.version == 0) { 1760 switch (args->version) { 1761 default: 1762 args->mount_server.version = NFS_MNT3_VERSION; 1763 break; 1764 case 2: 1765 args->mount_server.version = NFS_MNT_VERSION; 1766 } 1767 } 1768 request.version = args->mount_server.version; 1769 1770 if (args->mount_server.hostname) 1771 request.hostname = args->mount_server.hostname; 1772 else 1773 request.hostname = args->nfs_server.hostname; 1774 1775 /* 1776 * Construct the mount server's address. 1777 */ 1778 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1779 memcpy(request.sap, &args->nfs_server.address, 1780 args->nfs_server.addrlen); 1781 args->mount_server.addrlen = args->nfs_server.addrlen; 1782 } 1783 request.salen = args->mount_server.addrlen; 1784 nfs_set_port(request.sap, &args->mount_server.port, 0); 1785 1786 /* 1787 * Now ask the mount server to map our export path 1788 * to a file handle. 1789 */ 1790 status = nfs_mount(&request); 1791 if (status != 0) { 1792 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1793 request.hostname, status); 1794 return status; 1795 } 1796 1797 return 0; 1798 } 1799 1800 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info, 1801 struct nfs_subversion *nfs_mod) 1802 { 1803 int status; 1804 unsigned int i; 1805 bool tried_auth_unix = false; 1806 bool auth_null_in_list = false; 1807 struct nfs_server *server = ERR_PTR(-EACCES); 1808 struct nfs_parsed_mount_data *args = mount_info->parsed; 1809 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; 1810 unsigned int authlist_len = ARRAY_SIZE(authlist); 1811 1812 status = nfs_request_mount(args, mount_info->mntfh, authlist, 1813 &authlist_len); 1814 if (status) 1815 return ERR_PTR(status); 1816 1817 /* 1818 * Was a sec= authflavor specified in the options? First, verify 1819 * whether the server supports it, and then just try to use it if so. 1820 */ 1821 if (args->auth_info.flavor_len > 0) { 1822 status = nfs_verify_authflavors(args, authlist, authlist_len); 1823 dfprintk(MOUNT, "NFS: using auth flavor %u\n", 1824 args->selected_flavor); 1825 if (status) 1826 return ERR_PTR(status); 1827 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1828 } 1829 1830 /* 1831 * No sec= option was provided. RFC 2623, section 2.7 suggests we 1832 * SHOULD prefer the flavor listed first. However, some servers list 1833 * AUTH_NULL first. Avoid ever choosing AUTH_NULL. 1834 */ 1835 for (i = 0; i < authlist_len; ++i) { 1836 rpc_authflavor_t flavor; 1837 struct rpcsec_gss_info info; 1838 1839 flavor = authlist[i]; 1840 switch (flavor) { 1841 case RPC_AUTH_UNIX: 1842 tried_auth_unix = true; 1843 break; 1844 case RPC_AUTH_NULL: 1845 auth_null_in_list = true; 1846 continue; 1847 default: 1848 if (rpcauth_get_gssinfo(flavor, &info) != 0) 1849 continue; 1850 /* Fallthrough */ 1851 } 1852 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); 1853 args->selected_flavor = flavor; 1854 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1855 if (!IS_ERR(server)) 1856 return server; 1857 } 1858 1859 /* 1860 * Nothing we tried so far worked. At this point, give up if we've 1861 * already tried AUTH_UNIX or if the server's list doesn't contain 1862 * AUTH_NULL 1863 */ 1864 if (tried_auth_unix || !auth_null_in_list) 1865 return server; 1866 1867 /* Last chance! Try AUTH_UNIX */ 1868 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); 1869 args->selected_flavor = RPC_AUTH_UNIX; 1870 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1871 } 1872 1873 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1874 struct nfs_mount_info *mount_info, 1875 struct nfs_subversion *nfs_mod) 1876 { 1877 struct nfs_server *server; 1878 1879 if (mount_info->parsed->need_mount) 1880 server = nfs_try_mount_request(mount_info, nfs_mod); 1881 else 1882 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1883 1884 if (IS_ERR(server)) 1885 return ERR_CAST(server); 1886 1887 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1888 } 1889 EXPORT_SYMBOL_GPL(nfs_try_mount); 1890 1891 /* 1892 * Split "dev_name" into "hostname:export_path". 1893 * 1894 * The leftmost colon demarks the split between the server's hostname 1895 * and the export path. If the hostname starts with a left square 1896 * bracket, then it may contain colons. 1897 * 1898 * Note: caller frees hostname and export path, even on error. 1899 */ 1900 static int nfs_parse_devname(const char *dev_name, 1901 char **hostname, size_t maxnamlen, 1902 char **export_path, size_t maxpathlen) 1903 { 1904 size_t len; 1905 char *end; 1906 1907 /* Is the host name protected with square brakcets? */ 1908 if (*dev_name == '[') { 1909 end = strchr(++dev_name, ']'); 1910 if (end == NULL || end[1] != ':') 1911 goto out_bad_devname; 1912 1913 len = end - dev_name; 1914 end++; 1915 } else { 1916 char *comma; 1917 1918 end = strchr(dev_name, ':'); 1919 if (end == NULL) 1920 goto out_bad_devname; 1921 len = end - dev_name; 1922 1923 /* kill possible hostname list: not supported */ 1924 comma = strchr(dev_name, ','); 1925 if (comma != NULL && comma < end) 1926 *comma = 0; 1927 } 1928 1929 if (len > maxnamlen) 1930 goto out_hostname; 1931 1932 /* N.B. caller will free nfs_server.hostname in all cases */ 1933 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1934 if (*hostname == NULL) 1935 goto out_nomem; 1936 len = strlen(++end); 1937 if (len > maxpathlen) 1938 goto out_path; 1939 *export_path = kstrndup(end, len, GFP_KERNEL); 1940 if (!*export_path) 1941 goto out_nomem; 1942 1943 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1944 return 0; 1945 1946 out_bad_devname: 1947 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1948 return -EINVAL; 1949 1950 out_nomem: 1951 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1952 return -ENOMEM; 1953 1954 out_hostname: 1955 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1956 return -ENAMETOOLONG; 1957 1958 out_path: 1959 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1960 return -ENAMETOOLONG; 1961 } 1962 1963 /* 1964 * Validate the NFS2/NFS3 mount data 1965 * - fills in the mount root filehandle 1966 * 1967 * For option strings, user space handles the following behaviors: 1968 * 1969 * + DNS: mapping server host name to IP address ("addr=" option) 1970 * 1971 * + failure mode: how to behave if a mount request can't be handled 1972 * immediately ("fg/bg" option) 1973 * 1974 * + retry: how often to retry a mount request ("retry=" option) 1975 * 1976 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1977 * mountproto=tcp after mountproto=udp, and so on 1978 */ 1979 static int nfs23_validate_mount_data(void *options, 1980 struct nfs_parsed_mount_data *args, 1981 struct nfs_fh *mntfh, 1982 const char *dev_name) 1983 { 1984 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1985 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1986 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; 1987 1988 if (data == NULL) 1989 goto out_no_data; 1990 1991 args->version = NFS_DEFAULT_VERSION; 1992 switch (data->version) { 1993 case 1: 1994 data->namlen = 0; 1995 case 2: 1996 data->bsize = 0; 1997 case 3: 1998 if (data->flags & NFS_MOUNT_VER3) 1999 goto out_no_v3; 2000 data->root.size = NFS2_FHSIZE; 2001 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 2002 /* Turn off security negotiation */ 2003 extra_flags |= NFS_MOUNT_SECFLAVOUR; 2004 case 4: 2005 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2006 goto out_no_sec; 2007 case 5: 2008 memset(data->context, 0, sizeof(data->context)); 2009 case 6: 2010 if (data->flags & NFS_MOUNT_VER3) { 2011 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 2012 goto out_invalid_fh; 2013 mntfh->size = data->root.size; 2014 args->version = 3; 2015 } else { 2016 mntfh->size = NFS2_FHSIZE; 2017 args->version = 2; 2018 } 2019 2020 2021 memcpy(mntfh->data, data->root.data, mntfh->size); 2022 if (mntfh->size < sizeof(mntfh->data)) 2023 memset(mntfh->data + mntfh->size, 0, 2024 sizeof(mntfh->data) - mntfh->size); 2025 2026 /* 2027 * Translate to nfs_parsed_mount_data, which nfs_fill_super 2028 * can deal with. 2029 */ 2030 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 2031 args->flags |= extra_flags; 2032 args->rsize = data->rsize; 2033 args->wsize = data->wsize; 2034 args->timeo = data->timeo; 2035 args->retrans = data->retrans; 2036 args->acregmin = data->acregmin; 2037 args->acregmax = data->acregmax; 2038 args->acdirmin = data->acdirmin; 2039 args->acdirmax = data->acdirmax; 2040 args->need_mount = false; 2041 2042 memcpy(sap, &data->addr, sizeof(data->addr)); 2043 args->nfs_server.addrlen = sizeof(data->addr); 2044 args->nfs_server.port = ntohs(data->addr.sin_port); 2045 if (!nfs_verify_server_address(sap)) 2046 goto out_no_address; 2047 2048 if (!(data->flags & NFS_MOUNT_TCP)) 2049 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 2050 /* N.B. caller will free nfs_server.hostname in all cases */ 2051 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 2052 args->namlen = data->namlen; 2053 args->bsize = data->bsize; 2054 2055 if (data->flags & NFS_MOUNT_SECFLAVOUR) 2056 args->selected_flavor = data->pseudoflavor; 2057 else 2058 args->selected_flavor = RPC_AUTH_UNIX; 2059 if (!args->nfs_server.hostname) 2060 goto out_nomem; 2061 2062 if (!(data->flags & NFS_MOUNT_NONLM)) 2063 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 2064 NFS_MOUNT_LOCAL_FCNTL); 2065 else 2066 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 2067 NFS_MOUNT_LOCAL_FCNTL); 2068 /* 2069 * The legacy version 6 binary mount data from userspace has a 2070 * field used only to transport selinux information into the 2071 * the kernel. To continue to support that functionality we 2072 * have a touch of selinux knowledge here in the NFS code. The 2073 * userspace code converted context=blah to just blah so we are 2074 * converting back to the full string selinux understands. 2075 */ 2076 if (data->context[0]){ 2077 #ifdef CONFIG_SECURITY_SELINUX 2078 int rc; 2079 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 2080 if (!opts_str) 2081 return -ENOMEM; 2082 strcpy(opts_str, "context="); 2083 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 2084 strcat(opts_str, &data->context[0]); 2085 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 2086 kfree(opts_str); 2087 if (rc) 2088 return rc; 2089 #else 2090 return -EINVAL; 2091 #endif 2092 } 2093 2094 break; 2095 default: 2096 return NFS_TEXT_DATA; 2097 } 2098 2099 return 0; 2100 2101 out_no_data: 2102 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2103 return -EINVAL; 2104 2105 out_no_v3: 2106 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2107 data->version); 2108 return -EINVAL; 2109 2110 out_no_sec: 2111 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2112 return -EINVAL; 2113 2114 out_nomem: 2115 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2116 return -ENOMEM; 2117 2118 out_no_address: 2119 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2120 return -EINVAL; 2121 2122 out_invalid_fh: 2123 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2124 return -EINVAL; 2125 } 2126 2127 #if IS_ENABLED(CONFIG_NFS_V4) 2128 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2129 void *options, 2130 struct nfs_parsed_mount_data *args, 2131 struct nfs_fh *mntfh, 2132 const char *dev_name) 2133 { 2134 if (fs_type == &nfs_fs_type) 2135 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2136 return nfs4_validate_mount_data(options, args, dev_name); 2137 } 2138 #else 2139 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2140 void *options, 2141 struct nfs_parsed_mount_data *args, 2142 struct nfs_fh *mntfh, 2143 const char *dev_name) 2144 { 2145 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2146 } 2147 #endif 2148 2149 static int nfs_validate_text_mount_data(void *options, 2150 struct nfs_parsed_mount_data *args, 2151 const char *dev_name) 2152 { 2153 int port = 0; 2154 int max_namelen = PAGE_SIZE; 2155 int max_pathlen = NFS_MAXPATHLEN; 2156 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2157 2158 if (nfs_parse_mount_options((char *)options, args) == 0) 2159 return -EINVAL; 2160 2161 if (!nfs_verify_server_address(sap)) 2162 goto out_no_address; 2163 2164 if (args->version == 4) { 2165 #if IS_ENABLED(CONFIG_NFS_V4) 2166 port = NFS_PORT; 2167 max_namelen = NFS4_MAXNAMLEN; 2168 max_pathlen = NFS4_MAXPATHLEN; 2169 nfs_validate_transport_protocol(args); 2170 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2171 goto out_invalid_transport_udp; 2172 nfs4_validate_mount_flags(args); 2173 #else 2174 goto out_v4_not_compiled; 2175 #endif /* CONFIG_NFS_V4 */ 2176 } else 2177 nfs_set_mount_transport_protocol(args); 2178 2179 nfs_set_port(sap, &args->nfs_server.port, port); 2180 2181 return nfs_parse_devname(dev_name, 2182 &args->nfs_server.hostname, 2183 max_namelen, 2184 &args->nfs_server.export_path, 2185 max_pathlen); 2186 2187 #if !IS_ENABLED(CONFIG_NFS_V4) 2188 out_v4_not_compiled: 2189 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2190 return -EPROTONOSUPPORT; 2191 #else 2192 out_invalid_transport_udp: 2193 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2194 return -EINVAL; 2195 #endif /* !CONFIG_NFS_V4 */ 2196 2197 out_no_address: 2198 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2199 return -EINVAL; 2200 } 2201 2202 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ 2203 | NFS_MOUNT_SECURE \ 2204 | NFS_MOUNT_TCP \ 2205 | NFS_MOUNT_VER3 \ 2206 | NFS_MOUNT_KERBEROS \ 2207 | NFS_MOUNT_NONLM \ 2208 | NFS_MOUNT_BROKEN_SUID \ 2209 | NFS_MOUNT_STRICTLOCK \ 2210 | NFS_MOUNT_LEGACY_INTERFACE) 2211 2212 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ 2213 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) 2214 2215 static int 2216 nfs_compare_remount_data(struct nfs_server *nfss, 2217 struct nfs_parsed_mount_data *data) 2218 { 2219 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || 2220 data->rsize != nfss->rsize || 2221 data->wsize != nfss->wsize || 2222 data->version != nfss->nfs_client->rpc_ops->version || 2223 data->minorversion != nfss->nfs_client->cl_minorversion || 2224 data->retrans != nfss->client->cl_timeout->to_retries || 2225 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) || 2226 data->acregmin != nfss->acregmin / HZ || 2227 data->acregmax != nfss->acregmax / HZ || 2228 data->acdirmin != nfss->acdirmin / HZ || 2229 data->acdirmax != nfss->acdirmax / HZ || 2230 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2231 data->nfs_server.port != nfss->port || 2232 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2233 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2234 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2235 return -EINVAL; 2236 2237 return 0; 2238 } 2239 2240 int 2241 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2242 { 2243 int error; 2244 struct nfs_server *nfss = sb->s_fs_info; 2245 struct nfs_parsed_mount_data *data; 2246 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2247 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2248 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2249 2250 sync_filesystem(sb); 2251 2252 /* 2253 * Userspace mount programs that send binary options generally send 2254 * them populated with default values. We have no way to know which 2255 * ones were explicitly specified. Fall back to legacy behavior and 2256 * just return success. 2257 */ 2258 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2259 (nfsvers <= 3 && (!options || (options->version >= 1 && 2260 options->version <= 6)))) 2261 return 0; 2262 2263 data = kzalloc(sizeof(*data), GFP_KERNEL); 2264 if (data == NULL) 2265 return -ENOMEM; 2266 2267 /* fill out struct with values from existing mount */ 2268 data->flags = nfss->flags; 2269 data->rsize = nfss->rsize; 2270 data->wsize = nfss->wsize; 2271 data->retrans = nfss->client->cl_timeout->to_retries; 2272 data->selected_flavor = nfss->client->cl_auth->au_flavor; 2273 data->acregmin = nfss->acregmin / HZ; 2274 data->acregmax = nfss->acregmax / HZ; 2275 data->acdirmin = nfss->acdirmin / HZ; 2276 data->acdirmax = nfss->acdirmax / HZ; 2277 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2278 data->nfs_server.port = nfss->port; 2279 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2280 data->version = nfsvers; 2281 data->minorversion = nfss->nfs_client->cl_minorversion; 2282 data->net = current->nsproxy->net_ns; 2283 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2284 data->nfs_server.addrlen); 2285 2286 /* overwrite those values with any that were specified */ 2287 error = -EINVAL; 2288 if (!nfs_parse_mount_options((char *)options, data)) 2289 goto out; 2290 2291 /* 2292 * noac is a special case. It implies -o sync, but that's not 2293 * necessarily reflected in the mtab options. do_remount_sb 2294 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2295 * remount options, so we have to explicitly reset it. 2296 */ 2297 if (data->flags & NFS_MOUNT_NOAC) 2298 *flags |= MS_SYNCHRONOUS; 2299 2300 /* compare new mount options with old ones */ 2301 error = nfs_compare_remount_data(nfss, data); 2302 out: 2303 kfree(data); 2304 return error; 2305 } 2306 EXPORT_SYMBOL_GPL(nfs_remount); 2307 2308 /* 2309 * Initialise the common bits of the superblock 2310 */ 2311 inline void nfs_initialise_sb(struct super_block *sb) 2312 { 2313 struct nfs_server *server = NFS_SB(sb); 2314 2315 sb->s_magic = NFS_SUPER_MAGIC; 2316 2317 /* We probably want something more informative here */ 2318 snprintf(sb->s_id, sizeof(sb->s_id), 2319 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2320 2321 if (sb->s_blocksize == 0) 2322 sb->s_blocksize = nfs_block_bits(server->wsize, 2323 &sb->s_blocksize_bits); 2324 2325 sb->s_bdi = &server->backing_dev_info; 2326 2327 nfs_super_set_maxbytes(sb, server->maxfilesize); 2328 } 2329 2330 /* 2331 * Finish setting up an NFS2/3 superblock 2332 */ 2333 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2334 { 2335 struct nfs_parsed_mount_data *data = mount_info->parsed; 2336 struct nfs_server *server = NFS_SB(sb); 2337 2338 sb->s_blocksize_bits = 0; 2339 sb->s_blocksize = 0; 2340 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2341 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2342 if (data && data->bsize) 2343 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2344 2345 if (server->nfs_client->rpc_ops->version != 2) { 2346 /* The VFS shouldn't apply the umask to mode bits. We will do 2347 * so ourselves when necessary. 2348 */ 2349 sb->s_flags |= MS_POSIXACL; 2350 sb->s_time_gran = 1; 2351 } 2352 2353 nfs_initialise_sb(sb); 2354 } 2355 EXPORT_SYMBOL_GPL(nfs_fill_super); 2356 2357 /* 2358 * Finish setting up a cloned NFS2/3/4 superblock 2359 */ 2360 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2361 { 2362 const struct super_block *old_sb = mount_info->cloned->sb; 2363 struct nfs_server *server = NFS_SB(sb); 2364 2365 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2366 sb->s_blocksize = old_sb->s_blocksize; 2367 sb->s_maxbytes = old_sb->s_maxbytes; 2368 sb->s_xattr = old_sb->s_xattr; 2369 sb->s_op = old_sb->s_op; 2370 sb->s_time_gran = 1; 2371 2372 if (server->nfs_client->rpc_ops->version != 2) { 2373 /* The VFS shouldn't apply the umask to mode bits. We will do 2374 * so ourselves when necessary. 2375 */ 2376 sb->s_flags |= MS_POSIXACL; 2377 } 2378 2379 nfs_initialise_sb(sb); 2380 } 2381 2382 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2383 { 2384 const struct nfs_server *a = s->s_fs_info; 2385 const struct rpc_clnt *clnt_a = a->client; 2386 const struct rpc_clnt *clnt_b = b->client; 2387 2388 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2389 goto Ebusy; 2390 if (a->nfs_client != b->nfs_client) 2391 goto Ebusy; 2392 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) 2393 goto Ebusy; 2394 if (a->wsize != b->wsize) 2395 goto Ebusy; 2396 if (a->rsize != b->rsize) 2397 goto Ebusy; 2398 if (a->acregmin != b->acregmin) 2399 goto Ebusy; 2400 if (a->acregmax != b->acregmax) 2401 goto Ebusy; 2402 if (a->acdirmin != b->acdirmin) 2403 goto Ebusy; 2404 if (a->acdirmax != b->acdirmax) 2405 goto Ebusy; 2406 if (b->auth_info.flavor_len > 0 && 2407 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2408 goto Ebusy; 2409 return 1; 2410 Ebusy: 2411 return 0; 2412 } 2413 2414 struct nfs_sb_mountdata { 2415 struct nfs_server *server; 2416 int mntflags; 2417 }; 2418 2419 static int nfs_set_super(struct super_block *s, void *data) 2420 { 2421 struct nfs_sb_mountdata *sb_mntdata = data; 2422 struct nfs_server *server = sb_mntdata->server; 2423 int ret; 2424 2425 s->s_flags = sb_mntdata->mntflags; 2426 s->s_fs_info = server; 2427 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2428 ret = set_anon_super(s, server); 2429 if (ret == 0) 2430 server->s_dev = s->s_dev; 2431 return ret; 2432 } 2433 2434 static int nfs_compare_super_address(struct nfs_server *server1, 2435 struct nfs_server *server2) 2436 { 2437 struct sockaddr *sap1, *sap2; 2438 struct rpc_xprt *xprt1 = server1->client->cl_xprt; 2439 struct rpc_xprt *xprt2 = server2->client->cl_xprt; 2440 2441 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) 2442 return 0; 2443 2444 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2445 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2446 2447 if (sap1->sa_family != sap2->sa_family) 2448 return 0; 2449 2450 switch (sap1->sa_family) { 2451 case AF_INET: { 2452 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2453 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2454 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2455 return 0; 2456 if (sin1->sin_port != sin2->sin_port) 2457 return 0; 2458 break; 2459 } 2460 case AF_INET6: { 2461 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2462 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2463 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2464 return 0; 2465 if (sin1->sin6_port != sin2->sin6_port) 2466 return 0; 2467 break; 2468 } 2469 default: 2470 return 0; 2471 } 2472 2473 return 1; 2474 } 2475 2476 static int nfs_compare_super(struct super_block *sb, void *data) 2477 { 2478 struct nfs_sb_mountdata *sb_mntdata = data; 2479 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2480 int mntflags = sb_mntdata->mntflags; 2481 2482 if (!nfs_compare_super_address(old, server)) 2483 return 0; 2484 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2485 if (old->flags & NFS_MOUNT_UNSHARED) 2486 return 0; 2487 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2488 return 0; 2489 return nfs_compare_mount_options(sb, server, mntflags); 2490 } 2491 2492 #ifdef CONFIG_NFS_FSCACHE 2493 static void nfs_get_cache_cookie(struct super_block *sb, 2494 struct nfs_parsed_mount_data *parsed, 2495 struct nfs_clone_mount *cloned) 2496 { 2497 struct nfs_server *nfss = NFS_SB(sb); 2498 char *uniq = NULL; 2499 int ulen = 0; 2500 2501 nfss->fscache_key = NULL; 2502 nfss->fscache = NULL; 2503 2504 if (parsed) { 2505 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2506 return; 2507 if (parsed->fscache_uniq) { 2508 uniq = parsed->fscache_uniq; 2509 ulen = strlen(parsed->fscache_uniq); 2510 } 2511 } else if (cloned) { 2512 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2513 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2514 return; 2515 if (mnt_s->fscache_key) { 2516 uniq = mnt_s->fscache_key->key.uniquifier; 2517 ulen = mnt_s->fscache_key->key.uniq_len; 2518 }; 2519 } else 2520 return; 2521 2522 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2523 } 2524 #else 2525 static void nfs_get_cache_cookie(struct super_block *sb, 2526 struct nfs_parsed_mount_data *parsed, 2527 struct nfs_clone_mount *cloned) 2528 { 2529 } 2530 #endif 2531 2532 static int nfs_bdi_register(struct nfs_server *server) 2533 { 2534 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2535 } 2536 2537 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2538 struct nfs_mount_info *mount_info) 2539 { 2540 int error; 2541 unsigned long kflags = 0, kflags_out = 0; 2542 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL) 2543 kflags |= SECURITY_LSM_NATIVE_LABELS; 2544 2545 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts, 2546 kflags, &kflags_out); 2547 if (error) 2548 goto err; 2549 2550 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL && 2551 !(kflags_out & SECURITY_LSM_NATIVE_LABELS)) 2552 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL; 2553 err: 2554 return error; 2555 } 2556 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2557 2558 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2559 struct nfs_mount_info *mount_info) 2560 { 2561 /* clone any lsm security options from the parent to the new sb */ 2562 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2563 return -ESTALE; 2564 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2565 } 2566 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2567 2568 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2569 int flags, const char *dev_name, 2570 struct nfs_mount_info *mount_info, 2571 struct nfs_subversion *nfs_mod) 2572 { 2573 struct super_block *s; 2574 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2575 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2576 struct nfs_sb_mountdata sb_mntdata = { 2577 .mntflags = flags, 2578 .server = server, 2579 }; 2580 int error; 2581 2582 if (server->flags & NFS_MOUNT_UNSHARED) 2583 compare_super = NULL; 2584 2585 /* -o noac implies -o sync */ 2586 if (server->flags & NFS_MOUNT_NOAC) 2587 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2588 2589 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL) 2590 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS) 2591 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2592 2593 /* Get a superblock - note that we may end up sharing one that already exists */ 2594 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2595 if (IS_ERR(s)) { 2596 mntroot = ERR_CAST(s); 2597 goto out_err_nosb; 2598 } 2599 2600 if (s->s_fs_info != server) { 2601 nfs_free_server(server); 2602 server = NULL; 2603 } else { 2604 error = nfs_bdi_register(server); 2605 if (error) { 2606 mntroot = ERR_PTR(error); 2607 goto error_splat_super; 2608 } 2609 server->super = s; 2610 } 2611 2612 if (!s->s_root) { 2613 /* initial superblock/root creation */ 2614 mount_info->fill_super(s, mount_info); 2615 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2616 } 2617 2618 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2619 if (IS_ERR(mntroot)) 2620 goto error_splat_super; 2621 2622 error = mount_info->set_security(s, mntroot, mount_info); 2623 if (error) 2624 goto error_splat_root; 2625 2626 s->s_flags |= MS_ACTIVE; 2627 2628 out: 2629 return mntroot; 2630 2631 out_err_nosb: 2632 nfs_free_server(server); 2633 goto out; 2634 2635 error_splat_root: 2636 dput(mntroot); 2637 mntroot = ERR_PTR(error); 2638 error_splat_super: 2639 deactivate_locked_super(s); 2640 goto out; 2641 } 2642 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2643 2644 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2645 int flags, const char *dev_name, void *raw_data) 2646 { 2647 struct nfs_mount_info mount_info = { 2648 .fill_super = nfs_fill_super, 2649 .set_security = nfs_set_sb_security, 2650 }; 2651 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2652 struct nfs_subversion *nfs_mod; 2653 int error; 2654 2655 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2656 mount_info.mntfh = nfs_alloc_fhandle(); 2657 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2658 goto out; 2659 2660 /* Validate the mount data */ 2661 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2662 if (error == NFS_TEXT_DATA) 2663 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2664 if (error < 0) { 2665 mntroot = ERR_PTR(error); 2666 goto out; 2667 } 2668 2669 nfs_mod = get_nfs_version(mount_info.parsed->version); 2670 if (IS_ERR(nfs_mod)) { 2671 mntroot = ERR_CAST(nfs_mod); 2672 goto out; 2673 } 2674 2675 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2676 2677 put_nfs_version(nfs_mod); 2678 out: 2679 nfs_free_parsed_mount_data(mount_info.parsed); 2680 nfs_free_fhandle(mount_info.mntfh); 2681 return mntroot; 2682 } 2683 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2684 2685 /* 2686 * Destroy an NFS2/3 superblock 2687 */ 2688 void nfs_kill_super(struct super_block *s) 2689 { 2690 struct nfs_server *server = NFS_SB(s); 2691 dev_t dev = s->s_dev; 2692 2693 generic_shutdown_super(s); 2694 2695 nfs_fscache_release_super_cookie(s); 2696 2697 nfs_free_server(server); 2698 free_anon_bdev(dev); 2699 } 2700 EXPORT_SYMBOL_GPL(nfs_kill_super); 2701 2702 /* 2703 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2704 */ 2705 static struct dentry * 2706 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2707 const char *dev_name, void *raw_data) 2708 { 2709 struct nfs_clone_mount *data = raw_data; 2710 struct nfs_mount_info mount_info = { 2711 .fill_super = nfs_clone_super, 2712 .set_security = nfs_clone_sb_security, 2713 .cloned = data, 2714 }; 2715 struct nfs_server *server; 2716 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2717 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2718 2719 dprintk("--> nfs_xdev_mount()\n"); 2720 2721 mount_info.mntfh = mount_info.cloned->fh; 2722 2723 /* create a new volume representation */ 2724 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2725 2726 if (IS_ERR(server)) 2727 mntroot = ERR_CAST(server); 2728 else 2729 mntroot = nfs_fs_mount_common(server, flags, 2730 dev_name, &mount_info, nfs_mod); 2731 2732 dprintk("<-- nfs_xdev_mount() = %ld\n", 2733 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); 2734 return mntroot; 2735 } 2736 2737 #if IS_ENABLED(CONFIG_NFS_V4) 2738 2739 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2740 { 2741 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2742 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2743 } 2744 2745 /* 2746 * Validate NFSv4 mount options 2747 */ 2748 static int nfs4_validate_mount_data(void *options, 2749 struct nfs_parsed_mount_data *args, 2750 const char *dev_name) 2751 { 2752 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2753 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2754 char *c; 2755 2756 if (data == NULL) 2757 goto out_no_data; 2758 2759 args->version = 4; 2760 2761 switch (data->version) { 2762 case 1: 2763 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2764 goto out_no_address; 2765 if (data->host_addrlen == 0) 2766 goto out_no_address; 2767 args->nfs_server.addrlen = data->host_addrlen; 2768 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2769 return -EFAULT; 2770 if (!nfs_verify_server_address(sap)) 2771 goto out_no_address; 2772 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2773 2774 if (data->auth_flavourlen) { 2775 rpc_authflavor_t pseudoflavor; 2776 if (data->auth_flavourlen > 1) 2777 goto out_inval_auth; 2778 if (copy_from_user(&pseudoflavor, 2779 data->auth_flavours, 2780 sizeof(pseudoflavor))) 2781 return -EFAULT; 2782 args->selected_flavor = pseudoflavor; 2783 } else 2784 args->selected_flavor = RPC_AUTH_UNIX; 2785 2786 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2787 if (IS_ERR(c)) 2788 return PTR_ERR(c); 2789 args->nfs_server.hostname = c; 2790 2791 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2792 if (IS_ERR(c)) 2793 return PTR_ERR(c); 2794 args->nfs_server.export_path = c; 2795 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2796 2797 c = strndup_user(data->client_addr.data, 16); 2798 if (IS_ERR(c)) 2799 return PTR_ERR(c); 2800 args->client_address = c; 2801 2802 /* 2803 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2804 * can deal with. 2805 */ 2806 2807 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2808 args->rsize = data->rsize; 2809 args->wsize = data->wsize; 2810 args->timeo = data->timeo; 2811 args->retrans = data->retrans; 2812 args->acregmin = data->acregmin; 2813 args->acregmax = data->acregmax; 2814 args->acdirmin = data->acdirmin; 2815 args->acdirmax = data->acdirmax; 2816 args->nfs_server.protocol = data->proto; 2817 nfs_validate_transport_protocol(args); 2818 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP) 2819 goto out_invalid_transport_udp; 2820 2821 break; 2822 default: 2823 return NFS_TEXT_DATA; 2824 } 2825 2826 return 0; 2827 2828 out_no_data: 2829 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2830 return -EINVAL; 2831 2832 out_inval_auth: 2833 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2834 data->auth_flavourlen); 2835 return -EINVAL; 2836 2837 out_no_address: 2838 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2839 return -EINVAL; 2840 2841 out_invalid_transport_udp: 2842 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n"); 2843 return -EINVAL; 2844 } 2845 2846 /* 2847 * NFS v4 module parameters need to stay in the 2848 * NFS client for backwards compatibility 2849 */ 2850 unsigned int nfs_callback_set_tcpport; 2851 /* Default cache timeout is 10 minutes */ 2852 unsigned int nfs_idmap_cache_timeout = 600; 2853 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2854 bool nfs4_disable_idmapping = true; 2855 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2856 unsigned short send_implementation_id = 1; 2857 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2858 bool recover_lost_locks = false; 2859 2860 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2861 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2862 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2863 EXPORT_SYMBOL_GPL(max_session_slots); 2864 EXPORT_SYMBOL_GPL(send_implementation_id); 2865 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2866 EXPORT_SYMBOL_GPL(recover_lost_locks); 2867 2868 #define NFS_CALLBACK_MAXPORTNR (65535U) 2869 2870 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2871 { 2872 unsigned long num; 2873 int ret; 2874 2875 if (!val) 2876 return -EINVAL; 2877 ret = kstrtoul(val, 0, &num); 2878 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2879 return -EINVAL; 2880 *((unsigned int *)kp->arg) = num; 2881 return 0; 2882 } 2883 static const struct kernel_param_ops param_ops_portnr = { 2884 .set = param_set_portnr, 2885 .get = param_get_uint, 2886 }; 2887 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2888 2889 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2890 module_param(nfs_idmap_cache_timeout, int, 0644); 2891 module_param(nfs4_disable_idmapping, bool, 0644); 2892 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2893 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2894 MODULE_PARM_DESC(nfs4_disable_idmapping, 2895 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2896 module_param(max_session_slots, ushort, 0644); 2897 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2898 "requests the client will negotiate"); 2899 module_param(send_implementation_id, ushort, 0644); 2900 MODULE_PARM_DESC(send_implementation_id, 2901 "Send implementation ID with NFSv4.1 exchange_id"); 2902 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2903 2904 module_param(recover_lost_locks, bool, 0644); 2905 MODULE_PARM_DESC(recover_lost_locks, 2906 "If the server reports that a lock might be lost, " 2907 "try to recover it risking data corruption."); 2908 2909 2910 #endif /* CONFIG_NFS_V4 */ 2911