1 /* 2 * linux/fs/nfs/super.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs superblock handling functions 7 * 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 * Split from inode.c by David Howells <dhowells@redhat.com> 15 * 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a 17 * particular server are held in the same superblock 18 * - NFS superblocks can have several effective roots to the dentry tree 19 * - directory type roots are spliced into the tree when a path from one root reaches the root 20 * of another (see nfs_lookup()) 21 */ 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 26 #include <linux/time.h> 27 #include <linux/kernel.h> 28 #include <linux/mm.h> 29 #include <linux/string.h> 30 #include <linux/stat.h> 31 #include <linux/errno.h> 32 #include <linux/unistd.h> 33 #include <linux/sunrpc/clnt.h> 34 #include <linux/sunrpc/stats.h> 35 #include <linux/sunrpc/metrics.h> 36 #include <linux/sunrpc/xprtsock.h> 37 #include <linux/sunrpc/xprtrdma.h> 38 #include <linux/nfs_fs.h> 39 #include <linux/nfs_mount.h> 40 #include <linux/nfs4_mount.h> 41 #include <linux/lockd/bind.h> 42 #include <linux/seq_file.h> 43 #include <linux/mount.h> 44 #include <linux/namei.h> 45 #include <linux/nfs_idmap.h> 46 #include <linux/vfs.h> 47 #include <linux/inet.h> 48 #include <linux/in6.h> 49 #include <linux/slab.h> 50 #include <net/ipv6.h> 51 #include <linux/netdevice.h> 52 #include <linux/nfs_xdr.h> 53 #include <linux/magic.h> 54 #include <linux/parser.h> 55 #include <linux/nsproxy.h> 56 #include <linux/rcupdate.h> 57 #include <linux/kthread.h> 58 59 #include <asm/uaccess.h> 60 61 #include "nfs4_fs.h" 62 #include "callback.h" 63 #include "delegation.h" 64 #include "iostat.h" 65 #include "internal.h" 66 #include "fscache.h" 67 #include "pnfs.h" 68 #include "nfs.h" 69 70 #define NFSDBG_FACILITY NFSDBG_VFS 71 #define NFS_TEXT_DATA 1 72 73 #if IS_ENABLED(CONFIG_NFS_V3) 74 #define NFS_DEFAULT_VERSION 3 75 #else 76 #define NFS_DEFAULT_VERSION 2 77 #endif 78 79 enum { 80 /* Mount options that take no arguments */ 81 Opt_soft, Opt_hard, 82 Opt_posix, Opt_noposix, 83 Opt_cto, Opt_nocto, 84 Opt_ac, Opt_noac, 85 Opt_lock, Opt_nolock, 86 Opt_udp, Opt_tcp, Opt_rdma, 87 Opt_acl, Opt_noacl, 88 Opt_rdirplus, Opt_nordirplus, 89 Opt_sharecache, Opt_nosharecache, 90 Opt_resvport, Opt_noresvport, 91 Opt_fscache, Opt_nofscache, 92 Opt_migration, Opt_nomigration, 93 94 /* Mount options that take integer arguments */ 95 Opt_port, 96 Opt_rsize, Opt_wsize, Opt_bsize, 97 Opt_timeo, Opt_retrans, 98 Opt_acregmin, Opt_acregmax, 99 Opt_acdirmin, Opt_acdirmax, 100 Opt_actimeo, 101 Opt_namelen, 102 Opt_mountport, 103 Opt_mountvers, 104 Opt_minorversion, 105 106 /* Mount options that take string arguments */ 107 Opt_nfsvers, 108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 109 Opt_addr, Opt_mountaddr, Opt_clientaddr, 110 Opt_lookupcache, 111 Opt_fscache_uniq, 112 Opt_local_lock, 113 114 /* Special mount options */ 115 Opt_userspace, Opt_deprecated, Opt_sloppy, 116 117 Opt_err 118 }; 119 120 static const match_table_t nfs_mount_option_tokens = { 121 { Opt_userspace, "bg" }, 122 { Opt_userspace, "fg" }, 123 { Opt_userspace, "retry=%s" }, 124 125 { Opt_sloppy, "sloppy" }, 126 127 { Opt_soft, "soft" }, 128 { Opt_hard, "hard" }, 129 { Opt_deprecated, "intr" }, 130 { Opt_deprecated, "nointr" }, 131 { Opt_posix, "posix" }, 132 { Opt_noposix, "noposix" }, 133 { Opt_cto, "cto" }, 134 { Opt_nocto, "nocto" }, 135 { Opt_ac, "ac" }, 136 { Opt_noac, "noac" }, 137 { Opt_lock, "lock" }, 138 { Opt_nolock, "nolock" }, 139 { Opt_udp, "udp" }, 140 { Opt_tcp, "tcp" }, 141 { Opt_rdma, "rdma" }, 142 { Opt_acl, "acl" }, 143 { Opt_noacl, "noacl" }, 144 { Opt_rdirplus, "rdirplus" }, 145 { Opt_nordirplus, "nordirplus" }, 146 { Opt_sharecache, "sharecache" }, 147 { Opt_nosharecache, "nosharecache" }, 148 { Opt_resvport, "resvport" }, 149 { Opt_noresvport, "noresvport" }, 150 { Opt_fscache, "fsc" }, 151 { Opt_nofscache, "nofsc" }, 152 { Opt_migration, "migration" }, 153 { Opt_nomigration, "nomigration" }, 154 155 { Opt_port, "port=%s" }, 156 { Opt_rsize, "rsize=%s" }, 157 { Opt_wsize, "wsize=%s" }, 158 { Opt_bsize, "bsize=%s" }, 159 { Opt_timeo, "timeo=%s" }, 160 { Opt_retrans, "retrans=%s" }, 161 { Opt_acregmin, "acregmin=%s" }, 162 { Opt_acregmax, "acregmax=%s" }, 163 { Opt_acdirmin, "acdirmin=%s" }, 164 { Opt_acdirmax, "acdirmax=%s" }, 165 { Opt_actimeo, "actimeo=%s" }, 166 { Opt_namelen, "namlen=%s" }, 167 { Opt_mountport, "mountport=%s" }, 168 { Opt_mountvers, "mountvers=%s" }, 169 { Opt_minorversion, "minorversion=%s" }, 170 171 { Opt_nfsvers, "nfsvers=%s" }, 172 { Opt_nfsvers, "vers=%s" }, 173 174 { Opt_sec, "sec=%s" }, 175 { Opt_proto, "proto=%s" }, 176 { Opt_mountproto, "mountproto=%s" }, 177 { Opt_addr, "addr=%s" }, 178 { Opt_clientaddr, "clientaddr=%s" }, 179 { Opt_mounthost, "mounthost=%s" }, 180 { Opt_mountaddr, "mountaddr=%s" }, 181 182 { Opt_lookupcache, "lookupcache=%s" }, 183 { Opt_fscache_uniq, "fsc=%s" }, 184 { Opt_local_lock, "local_lock=%s" }, 185 186 /* The following needs to be listed after all other options */ 187 { Opt_nfsvers, "v%s" }, 188 189 { Opt_err, NULL } 190 }; 191 192 enum { 193 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 194 195 Opt_xprt_err 196 }; 197 198 static const match_table_t nfs_xprt_protocol_tokens = { 199 { Opt_xprt_udp, "udp" }, 200 { Opt_xprt_udp6, "udp6" }, 201 { Opt_xprt_tcp, "tcp" }, 202 { Opt_xprt_tcp6, "tcp6" }, 203 { Opt_xprt_rdma, "rdma" }, 204 205 { Opt_xprt_err, NULL } 206 }; 207 208 enum { 209 Opt_sec_none, Opt_sec_sys, 210 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 211 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 212 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 213 214 Opt_sec_err 215 }; 216 217 static const match_table_t nfs_secflavor_tokens = { 218 { Opt_sec_none, "none" }, 219 { Opt_sec_none, "null" }, 220 { Opt_sec_sys, "sys" }, 221 222 { Opt_sec_krb5, "krb5" }, 223 { Opt_sec_krb5i, "krb5i" }, 224 { Opt_sec_krb5p, "krb5p" }, 225 226 { Opt_sec_lkey, "lkey" }, 227 { Opt_sec_lkeyi, "lkeyi" }, 228 { Opt_sec_lkeyp, "lkeyp" }, 229 230 { Opt_sec_spkm, "spkm3" }, 231 { Opt_sec_spkmi, "spkm3i" }, 232 { Opt_sec_spkmp, "spkm3p" }, 233 234 { Opt_sec_err, NULL } 235 }; 236 237 enum { 238 Opt_lookupcache_all, Opt_lookupcache_positive, 239 Opt_lookupcache_none, 240 241 Opt_lookupcache_err 242 }; 243 244 static match_table_t nfs_lookupcache_tokens = { 245 { Opt_lookupcache_all, "all" }, 246 { Opt_lookupcache_positive, "pos" }, 247 { Opt_lookupcache_positive, "positive" }, 248 { Opt_lookupcache_none, "none" }, 249 250 { Opt_lookupcache_err, NULL } 251 }; 252 253 enum { 254 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 255 Opt_local_lock_none, 256 257 Opt_local_lock_err 258 }; 259 260 static match_table_t nfs_local_lock_tokens = { 261 { Opt_local_lock_all, "all" }, 262 { Opt_local_lock_flock, "flock" }, 263 { Opt_local_lock_posix, "posix" }, 264 { Opt_local_lock_none, "none" }, 265 266 { Opt_local_lock_err, NULL } 267 }; 268 269 enum { 270 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 271 Opt_vers_4_1, 272 273 Opt_vers_err 274 }; 275 276 static match_table_t nfs_vers_tokens = { 277 { Opt_vers_2, "2" }, 278 { Opt_vers_3, "3" }, 279 { Opt_vers_4, "4" }, 280 { Opt_vers_4_0, "4.0" }, 281 { Opt_vers_4_1, "4.1" }, 282 283 { Opt_vers_err, NULL } 284 }; 285 286 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 287 int flags, const char *dev_name, void *raw_data); 288 289 struct file_system_type nfs_fs_type = { 290 .owner = THIS_MODULE, 291 .name = "nfs", 292 .mount = nfs_fs_mount, 293 .kill_sb = nfs_kill_super, 294 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 295 }; 296 EXPORT_SYMBOL_GPL(nfs_fs_type); 297 298 struct file_system_type nfs_xdev_fs_type = { 299 .owner = THIS_MODULE, 300 .name = "nfs", 301 .mount = nfs_xdev_mount, 302 .kill_sb = nfs_kill_super, 303 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 304 }; 305 306 const struct super_operations nfs_sops = { 307 .alloc_inode = nfs_alloc_inode, 308 .destroy_inode = nfs_destroy_inode, 309 .write_inode = nfs_write_inode, 310 .put_super = nfs_put_super, 311 .statfs = nfs_statfs, 312 .evict_inode = nfs_evict_inode, 313 .umount_begin = nfs_umount_begin, 314 .show_options = nfs_show_options, 315 .show_devname = nfs_show_devname, 316 .show_path = nfs_show_path, 317 .show_stats = nfs_show_stats, 318 .remount_fs = nfs_remount, 319 }; 320 EXPORT_SYMBOL_GPL(nfs_sops); 321 322 #if IS_ENABLED(CONFIG_NFS_V4) 323 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 324 static int nfs4_validate_mount_data(void *options, 325 struct nfs_parsed_mount_data *args, const char *dev_name); 326 327 struct file_system_type nfs4_fs_type = { 328 .owner = THIS_MODULE, 329 .name = "nfs4", 330 .mount = nfs_fs_mount, 331 .kill_sb = nfs_kill_super, 332 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 333 }; 334 EXPORT_SYMBOL_GPL(nfs4_fs_type); 335 336 static int __init register_nfs4_fs(void) 337 { 338 return register_filesystem(&nfs4_fs_type); 339 } 340 341 static void unregister_nfs4_fs(void) 342 { 343 unregister_filesystem(&nfs4_fs_type); 344 } 345 #else 346 static int __init register_nfs4_fs(void) 347 { 348 return 0; 349 } 350 351 static void unregister_nfs4_fs(void) 352 { 353 } 354 #endif 355 356 static struct shrinker acl_shrinker = { 357 .shrink = nfs_access_cache_shrinker, 358 .seeks = DEFAULT_SEEKS, 359 }; 360 361 /* 362 * Register the NFS filesystems 363 */ 364 int __init register_nfs_fs(void) 365 { 366 int ret; 367 368 ret = register_filesystem(&nfs_fs_type); 369 if (ret < 0) 370 goto error_0; 371 372 ret = register_nfs4_fs(); 373 if (ret < 0) 374 goto error_1; 375 376 ret = nfs_register_sysctl(); 377 if (ret < 0) 378 goto error_2; 379 register_shrinker(&acl_shrinker); 380 return 0; 381 382 error_2: 383 unregister_nfs4_fs(); 384 error_1: 385 unregister_filesystem(&nfs_fs_type); 386 error_0: 387 return ret; 388 } 389 390 /* 391 * Unregister the NFS filesystems 392 */ 393 void __exit unregister_nfs_fs(void) 394 { 395 unregister_shrinker(&acl_shrinker); 396 nfs_unregister_sysctl(); 397 unregister_nfs4_fs(); 398 unregister_filesystem(&nfs_fs_type); 399 } 400 401 void nfs_sb_active(struct super_block *sb) 402 { 403 struct nfs_server *server = NFS_SB(sb); 404 405 if (atomic_inc_return(&server->active) == 1) 406 atomic_inc(&sb->s_active); 407 } 408 EXPORT_SYMBOL_GPL(nfs_sb_active); 409 410 void nfs_sb_deactive(struct super_block *sb) 411 { 412 struct nfs_server *server = NFS_SB(sb); 413 414 if (atomic_dec_and_test(&server->active)) 415 deactivate_super(sb); 416 } 417 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 418 419 static int nfs_deactivate_super_async_work(void *ptr) 420 { 421 struct super_block *sb = ptr; 422 423 deactivate_super(sb); 424 module_put_and_exit(0); 425 return 0; 426 } 427 428 /* 429 * same effect as deactivate_super, but will do final unmount in kthread 430 * context 431 */ 432 static void nfs_deactivate_super_async(struct super_block *sb) 433 { 434 struct task_struct *task; 435 char buf[INET6_ADDRSTRLEN + 1]; 436 struct nfs_server *server = NFS_SB(sb); 437 struct nfs_client *clp = server->nfs_client; 438 439 if (!atomic_add_unless(&sb->s_active, -1, 1)) { 440 rcu_read_lock(); 441 snprintf(buf, sizeof(buf), 442 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 443 rcu_read_unlock(); 444 445 __module_get(THIS_MODULE); 446 task = kthread_run(nfs_deactivate_super_async_work, sb, 447 "%s-deactivate-super", buf); 448 if (IS_ERR(task)) { 449 pr_err("%s: kthread_run: %ld\n", 450 __func__, PTR_ERR(task)); 451 /* make synchronous call and hope for the best */ 452 deactivate_super(sb); 453 module_put(THIS_MODULE); 454 } 455 } 456 } 457 458 void nfs_sb_deactive_async(struct super_block *sb) 459 { 460 struct nfs_server *server = NFS_SB(sb); 461 462 if (atomic_dec_and_test(&server->active)) 463 nfs_deactivate_super_async(sb); 464 } 465 EXPORT_SYMBOL_GPL(nfs_sb_deactive_async); 466 467 /* 468 * Deliver file system statistics to userspace 469 */ 470 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 471 { 472 struct nfs_server *server = NFS_SB(dentry->d_sb); 473 unsigned char blockbits; 474 unsigned long blockres; 475 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 476 struct nfs_fsstat res; 477 int error = -ENOMEM; 478 479 res.fattr = nfs_alloc_fattr(); 480 if (res.fattr == NULL) 481 goto out_err; 482 483 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 484 if (unlikely(error == -ESTALE)) { 485 struct dentry *pd_dentry; 486 487 pd_dentry = dget_parent(dentry); 488 if (pd_dentry != NULL) { 489 nfs_zap_caches(pd_dentry->d_inode); 490 dput(pd_dentry); 491 } 492 } 493 nfs_free_fattr(res.fattr); 494 if (error < 0) 495 goto out_err; 496 497 buf->f_type = NFS_SUPER_MAGIC; 498 499 /* 500 * Current versions of glibc do not correctly handle the 501 * case where f_frsize != f_bsize. Eventually we want to 502 * report the value of wtmult in this field. 503 */ 504 buf->f_frsize = dentry->d_sb->s_blocksize; 505 506 /* 507 * On most *nix systems, f_blocks, f_bfree, and f_bavail 508 * are reported in units of f_frsize. Linux hasn't had 509 * an f_frsize field in its statfs struct until recently, 510 * thus historically Linux's sys_statfs reports these 511 * fields in units of f_bsize. 512 */ 513 buf->f_bsize = dentry->d_sb->s_blocksize; 514 blockbits = dentry->d_sb->s_blocksize_bits; 515 blockres = (1 << blockbits) - 1; 516 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 517 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 518 buf->f_bavail = (res.abytes + blockres) >> blockbits; 519 520 buf->f_files = res.tfiles; 521 buf->f_ffree = res.afiles; 522 523 buf->f_namelen = server->namelen; 524 525 return 0; 526 527 out_err: 528 dprintk("%s: statfs error = %d\n", __func__, -error); 529 return error; 530 } 531 EXPORT_SYMBOL_GPL(nfs_statfs); 532 533 /* 534 * Map the security flavour number to a name 535 */ 536 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 537 { 538 static const struct { 539 rpc_authflavor_t flavour; 540 const char *str; 541 } sec_flavours[] = { 542 { RPC_AUTH_NULL, "null" }, 543 { RPC_AUTH_UNIX, "sys" }, 544 { RPC_AUTH_GSS_KRB5, "krb5" }, 545 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 546 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 547 { RPC_AUTH_GSS_LKEY, "lkey" }, 548 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 549 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 550 { RPC_AUTH_GSS_SPKM, "spkm" }, 551 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 552 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 553 { UINT_MAX, "unknown" } 554 }; 555 int i; 556 557 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 558 if (sec_flavours[i].flavour == flavour) 559 break; 560 } 561 return sec_flavours[i].str; 562 } 563 564 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 565 int showdefaults) 566 { 567 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 568 569 seq_printf(m, ",mountproto="); 570 switch (sap->sa_family) { 571 case AF_INET: 572 switch (nfss->mountd_protocol) { 573 case IPPROTO_UDP: 574 seq_printf(m, RPCBIND_NETID_UDP); 575 break; 576 case IPPROTO_TCP: 577 seq_printf(m, RPCBIND_NETID_TCP); 578 break; 579 default: 580 if (showdefaults) 581 seq_printf(m, "auto"); 582 } 583 break; 584 case AF_INET6: 585 switch (nfss->mountd_protocol) { 586 case IPPROTO_UDP: 587 seq_printf(m, RPCBIND_NETID_UDP6); 588 break; 589 case IPPROTO_TCP: 590 seq_printf(m, RPCBIND_NETID_TCP6); 591 break; 592 default: 593 if (showdefaults) 594 seq_printf(m, "auto"); 595 } 596 break; 597 default: 598 if (showdefaults) 599 seq_printf(m, "auto"); 600 } 601 } 602 603 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 604 int showdefaults) 605 { 606 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 607 608 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 609 return; 610 611 switch (sap->sa_family) { 612 case AF_INET: { 613 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 614 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 615 break; 616 } 617 case AF_INET6: { 618 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 619 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 620 break; 621 } 622 default: 623 if (showdefaults) 624 seq_printf(m, ",mountaddr=unspecified"); 625 } 626 627 if (nfss->mountd_version || showdefaults) 628 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 629 if ((nfss->mountd_port && 630 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 631 showdefaults) 632 seq_printf(m, ",mountport=%u", nfss->mountd_port); 633 634 nfs_show_mountd_netid(m, nfss, showdefaults); 635 } 636 637 #if IS_ENABLED(CONFIG_NFS_V4) 638 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 639 int showdefaults) 640 { 641 struct nfs_client *clp = nfss->nfs_client; 642 643 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 644 } 645 #else 646 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 647 int showdefaults) 648 { 649 } 650 #endif 651 652 static void nfs_show_nfs_version(struct seq_file *m, 653 unsigned int version, 654 unsigned int minorversion) 655 { 656 seq_printf(m, ",vers=%u", version); 657 if (version == 4) 658 seq_printf(m, ".%u", minorversion); 659 } 660 661 /* 662 * Describe the mount options in force on this server representation 663 */ 664 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 665 int showdefaults) 666 { 667 static const struct proc_nfs_info { 668 int flag; 669 const char *str; 670 const char *nostr; 671 } nfs_info[] = { 672 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 673 { NFS_MOUNT_POSIX, ",posix", "" }, 674 { NFS_MOUNT_NOCTO, ",nocto", "" }, 675 { NFS_MOUNT_NOAC, ",noac", "" }, 676 { NFS_MOUNT_NONLM, ",nolock", "" }, 677 { NFS_MOUNT_NOACL, ",noacl", "" }, 678 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 679 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 680 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 681 { 0, NULL, NULL } 682 }; 683 const struct proc_nfs_info *nfs_infop; 684 struct nfs_client *clp = nfss->nfs_client; 685 u32 version = clp->rpc_ops->version; 686 int local_flock, local_fcntl; 687 688 nfs_show_nfs_version(m, version, clp->cl_minorversion); 689 seq_printf(m, ",rsize=%u", nfss->rsize); 690 seq_printf(m, ",wsize=%u", nfss->wsize); 691 if (nfss->bsize != 0) 692 seq_printf(m, ",bsize=%u", nfss->bsize); 693 seq_printf(m, ",namlen=%u", nfss->namelen); 694 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 695 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 696 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 697 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 698 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 699 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 700 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 701 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 702 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 703 if (nfss->flags & nfs_infop->flag) 704 seq_puts(m, nfs_infop->str); 705 else 706 seq_puts(m, nfs_infop->nostr); 707 } 708 rcu_read_lock(); 709 seq_printf(m, ",proto=%s", 710 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 711 rcu_read_unlock(); 712 if (version == 4) { 713 if (nfss->port != NFS_PORT) 714 seq_printf(m, ",port=%u", nfss->port); 715 } else 716 if (nfss->port) 717 seq_printf(m, ",port=%u", nfss->port); 718 719 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 720 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 721 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 722 723 if (version != 4) 724 nfs_show_mountd_options(m, nfss, showdefaults); 725 else 726 nfs_show_nfsv4_options(m, nfss, showdefaults); 727 728 if (nfss->options & NFS_OPTION_FSCACHE) 729 seq_printf(m, ",fsc"); 730 731 if (nfss->options & NFS_OPTION_MIGRATION) 732 seq_printf(m, ",migration"); 733 734 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 735 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 736 seq_printf(m, ",lookupcache=none"); 737 else 738 seq_printf(m, ",lookupcache=pos"); 739 } 740 741 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 742 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 743 744 if (!local_flock && !local_fcntl) 745 seq_printf(m, ",local_lock=none"); 746 else if (local_flock && local_fcntl) 747 seq_printf(m, ",local_lock=all"); 748 else if (local_flock) 749 seq_printf(m, ",local_lock=flock"); 750 else 751 seq_printf(m, ",local_lock=posix"); 752 } 753 754 /* 755 * Describe the mount options on this VFS mountpoint 756 */ 757 int nfs_show_options(struct seq_file *m, struct dentry *root) 758 { 759 struct nfs_server *nfss = NFS_SB(root->d_sb); 760 761 nfs_show_mount_options(m, nfss, 0); 762 763 rcu_read_lock(); 764 seq_printf(m, ",addr=%s", 765 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 766 RPC_DISPLAY_ADDR)); 767 rcu_read_unlock(); 768 769 return 0; 770 } 771 EXPORT_SYMBOL_GPL(nfs_show_options); 772 773 #if IS_ENABLED(CONFIG_NFS_V4) 774 #ifdef CONFIG_NFS_V4_1 775 static void show_sessions(struct seq_file *m, struct nfs_server *server) 776 { 777 if (nfs4_has_session(server->nfs_client)) 778 seq_printf(m, ",sessions"); 779 } 780 #else 781 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 782 #endif 783 #endif 784 785 #ifdef CONFIG_NFS_V4_1 786 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 787 { 788 seq_printf(m, ",pnfs="); 789 if (server->pnfs_curr_ld) 790 seq_printf(m, "%s", server->pnfs_curr_ld->name); 791 else 792 seq_printf(m, "not configured"); 793 } 794 795 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 796 { 797 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 798 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 799 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 800 "date='%llu,%u'", 801 impl_id->name, impl_id->domain, 802 impl_id->date.seconds, impl_id->date.nseconds); 803 } 804 } 805 #else 806 #if IS_ENABLED(CONFIG_NFS_V4) 807 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 808 { 809 } 810 #endif 811 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 812 { 813 } 814 #endif 815 816 int nfs_show_devname(struct seq_file *m, struct dentry *root) 817 { 818 char *page = (char *) __get_free_page(GFP_KERNEL); 819 char *devname, *dummy; 820 int err = 0; 821 if (!page) 822 return -ENOMEM; 823 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 824 if (IS_ERR(devname)) 825 err = PTR_ERR(devname); 826 else 827 seq_escape(m, devname, " \t\n\\"); 828 free_page((unsigned long)page); 829 return err; 830 } 831 EXPORT_SYMBOL_GPL(nfs_show_devname); 832 833 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 834 { 835 seq_puts(m, "/"); 836 return 0; 837 } 838 EXPORT_SYMBOL_GPL(nfs_show_path); 839 840 /* 841 * Present statistical information for this VFS mountpoint 842 */ 843 int nfs_show_stats(struct seq_file *m, struct dentry *root) 844 { 845 int i, cpu; 846 struct nfs_server *nfss = NFS_SB(root->d_sb); 847 struct rpc_auth *auth = nfss->client->cl_auth; 848 struct nfs_iostats totals = { }; 849 850 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 851 852 /* 853 * Display all mount option settings 854 */ 855 seq_printf(m, "\n\topts:\t"); 856 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 857 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 858 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 859 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 860 nfs_show_mount_options(m, nfss, 1); 861 862 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 863 864 show_implementation_id(m, nfss); 865 866 seq_printf(m, "\n\tcaps:\t"); 867 seq_printf(m, "caps=0x%x", nfss->caps); 868 seq_printf(m, ",wtmult=%u", nfss->wtmult); 869 seq_printf(m, ",dtsize=%u", nfss->dtsize); 870 seq_printf(m, ",bsize=%u", nfss->bsize); 871 seq_printf(m, ",namlen=%u", nfss->namelen); 872 873 #if IS_ENABLED(CONFIG_NFS_V4) 874 if (nfss->nfs_client->rpc_ops->version == 4) { 875 seq_printf(m, "\n\tnfsv4:\t"); 876 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 877 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 878 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 879 show_sessions(m, nfss); 880 show_pnfs(m, nfss); 881 } 882 #endif 883 884 /* 885 * Display security flavor in effect for this mount 886 */ 887 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 888 if (auth->au_flavor) 889 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 890 891 /* 892 * Display superblock I/O counters 893 */ 894 for_each_possible_cpu(cpu) { 895 struct nfs_iostats *stats; 896 897 preempt_disable(); 898 stats = per_cpu_ptr(nfss->io_stats, cpu); 899 900 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 901 totals.events[i] += stats->events[i]; 902 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 903 totals.bytes[i] += stats->bytes[i]; 904 #ifdef CONFIG_NFS_FSCACHE 905 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 906 totals.fscache[i] += stats->fscache[i]; 907 #endif 908 909 preempt_enable(); 910 } 911 912 seq_printf(m, "\n\tevents:\t"); 913 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 914 seq_printf(m, "%lu ", totals.events[i]); 915 seq_printf(m, "\n\tbytes:\t"); 916 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 917 seq_printf(m, "%Lu ", totals.bytes[i]); 918 #ifdef CONFIG_NFS_FSCACHE 919 if (nfss->options & NFS_OPTION_FSCACHE) { 920 seq_printf(m, "\n\tfsc:\t"); 921 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 922 seq_printf(m, "%Lu ", totals.bytes[i]); 923 } 924 #endif 925 seq_printf(m, "\n"); 926 927 rpc_print_iostats(m, nfss->client); 928 929 return 0; 930 } 931 EXPORT_SYMBOL_GPL(nfs_show_stats); 932 933 /* 934 * Begin unmount by attempting to remove all automounted mountpoints we added 935 * in response to xdev traversals and referrals 936 */ 937 void nfs_umount_begin(struct super_block *sb) 938 { 939 struct nfs_server *server; 940 struct rpc_clnt *rpc; 941 942 server = NFS_SB(sb); 943 /* -EIO all pending I/O */ 944 rpc = server->client_acl; 945 if (!IS_ERR(rpc)) 946 rpc_killall_tasks(rpc); 947 rpc = server->client; 948 if (!IS_ERR(rpc)) 949 rpc_killall_tasks(rpc); 950 } 951 EXPORT_SYMBOL_GPL(nfs_umount_begin); 952 953 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 954 { 955 struct nfs_parsed_mount_data *data; 956 957 data = kzalloc(sizeof(*data), GFP_KERNEL); 958 if (data) { 959 data->acregmin = NFS_DEF_ACREGMIN; 960 data->acregmax = NFS_DEF_ACREGMAX; 961 data->acdirmin = NFS_DEF_ACDIRMIN; 962 data->acdirmax = NFS_DEF_ACDIRMAX; 963 data->mount_server.port = NFS_UNSPEC_PORT; 964 data->nfs_server.port = NFS_UNSPEC_PORT; 965 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 966 data->auth_flavors[0] = RPC_AUTH_UNIX; 967 data->auth_flavor_len = 1; 968 data->minorversion = 0; 969 data->need_mount = true; 970 data->net = current->nsproxy->net_ns; 971 security_init_mnt_opts(&data->lsm_opts); 972 } 973 return data; 974 } 975 976 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 977 { 978 if (data) { 979 kfree(data->client_address); 980 kfree(data->mount_server.hostname); 981 kfree(data->nfs_server.export_path); 982 kfree(data->nfs_server.hostname); 983 kfree(data->fscache_uniq); 984 security_free_mnt_opts(&data->lsm_opts); 985 kfree(data); 986 } 987 } 988 989 /* 990 * Sanity-check a server address provided by the mount command. 991 * 992 * Address family must be initialized, and address must not be 993 * the ANY address for that family. 994 */ 995 static int nfs_verify_server_address(struct sockaddr *addr) 996 { 997 switch (addr->sa_family) { 998 case AF_INET: { 999 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 1000 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 1001 } 1002 case AF_INET6: { 1003 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 1004 return !ipv6_addr_any(sa); 1005 } 1006 } 1007 1008 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 1009 return 0; 1010 } 1011 1012 /* 1013 * Select between a default port value and a user-specified port value. 1014 * If a zero value is set, then autobind will be used. 1015 */ 1016 static void nfs_set_port(struct sockaddr *sap, int *port, 1017 const unsigned short default_port) 1018 { 1019 if (*port == NFS_UNSPEC_PORT) 1020 *port = default_port; 1021 1022 rpc_set_port(sap, *port); 1023 } 1024 1025 /* 1026 * Sanity check the NFS transport protocol. 1027 * 1028 */ 1029 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 1030 { 1031 switch (mnt->nfs_server.protocol) { 1032 case XPRT_TRANSPORT_UDP: 1033 case XPRT_TRANSPORT_TCP: 1034 case XPRT_TRANSPORT_RDMA: 1035 break; 1036 default: 1037 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1038 } 1039 } 1040 1041 /* 1042 * For text based NFSv2/v3 mounts, the mount protocol transport default 1043 * settings should depend upon the specified NFS transport. 1044 */ 1045 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1046 { 1047 nfs_validate_transport_protocol(mnt); 1048 1049 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1050 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1051 return; 1052 switch (mnt->nfs_server.protocol) { 1053 case XPRT_TRANSPORT_UDP: 1054 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1055 break; 1056 case XPRT_TRANSPORT_TCP: 1057 case XPRT_TRANSPORT_RDMA: 1058 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1059 } 1060 } 1061 1062 /* 1063 * Parse the value of the 'sec=' option. 1064 */ 1065 static int nfs_parse_security_flavors(char *value, 1066 struct nfs_parsed_mount_data *mnt) 1067 { 1068 substring_t args[MAX_OPT_ARGS]; 1069 1070 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1071 1072 switch (match_token(value, nfs_secflavor_tokens, args)) { 1073 case Opt_sec_none: 1074 mnt->auth_flavors[0] = RPC_AUTH_NULL; 1075 break; 1076 case Opt_sec_sys: 1077 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 1078 break; 1079 case Opt_sec_krb5: 1080 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 1081 break; 1082 case Opt_sec_krb5i: 1083 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 1084 break; 1085 case Opt_sec_krb5p: 1086 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 1087 break; 1088 case Opt_sec_lkey: 1089 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 1090 break; 1091 case Opt_sec_lkeyi: 1092 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 1093 break; 1094 case Opt_sec_lkeyp: 1095 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 1096 break; 1097 case Opt_sec_spkm: 1098 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 1099 break; 1100 case Opt_sec_spkmi: 1101 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 1102 break; 1103 case Opt_sec_spkmp: 1104 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 1105 break; 1106 default: 1107 return 0; 1108 } 1109 1110 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 1111 mnt->auth_flavor_len = 1; 1112 return 1; 1113 } 1114 1115 static int nfs_parse_version_string(char *string, 1116 struct nfs_parsed_mount_data *mnt, 1117 substring_t *args) 1118 { 1119 mnt->flags &= ~NFS_MOUNT_VER3; 1120 switch (match_token(string, nfs_vers_tokens, args)) { 1121 case Opt_vers_2: 1122 mnt->version = 2; 1123 break; 1124 case Opt_vers_3: 1125 mnt->flags |= NFS_MOUNT_VER3; 1126 mnt->version = 3; 1127 break; 1128 case Opt_vers_4: 1129 /* Backward compatibility option. In future, 1130 * the mount program should always supply 1131 * a NFSv4 minor version number. 1132 */ 1133 mnt->version = 4; 1134 break; 1135 case Opt_vers_4_0: 1136 mnt->version = 4; 1137 mnt->minorversion = 0; 1138 break; 1139 case Opt_vers_4_1: 1140 mnt->version = 4; 1141 mnt->minorversion = 1; 1142 break; 1143 default: 1144 return 0; 1145 } 1146 return 1; 1147 } 1148 1149 static int nfs_get_option_str(substring_t args[], char **option) 1150 { 1151 kfree(*option); 1152 *option = match_strdup(args); 1153 return !option; 1154 } 1155 1156 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1157 { 1158 int rc; 1159 char *string; 1160 1161 string = match_strdup(args); 1162 if (string == NULL) 1163 return -ENOMEM; 1164 rc = kstrtoul(string, 10, option); 1165 kfree(string); 1166 1167 return rc; 1168 } 1169 1170 /* 1171 * Error-check and convert a string of mount options from user space into 1172 * a data structure. The whole mount string is processed; bad options are 1173 * skipped as they are encountered. If there were no errors, return 1; 1174 * otherwise return 0 (zero). 1175 */ 1176 static int nfs_parse_mount_options(char *raw, 1177 struct nfs_parsed_mount_data *mnt) 1178 { 1179 char *p, *string, *secdata; 1180 int rc, sloppy = 0, invalid_option = 0; 1181 unsigned short protofamily = AF_UNSPEC; 1182 unsigned short mountfamily = AF_UNSPEC; 1183 1184 if (!raw) { 1185 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1186 return 1; 1187 } 1188 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1189 1190 secdata = alloc_secdata(); 1191 if (!secdata) 1192 goto out_nomem; 1193 1194 rc = security_sb_copy_data(raw, secdata); 1195 if (rc) 1196 goto out_security_failure; 1197 1198 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1199 if (rc) 1200 goto out_security_failure; 1201 1202 free_secdata(secdata); 1203 1204 while ((p = strsep(&raw, ",")) != NULL) { 1205 substring_t args[MAX_OPT_ARGS]; 1206 unsigned long option; 1207 int token; 1208 1209 if (!*p) 1210 continue; 1211 1212 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1213 1214 token = match_token(p, nfs_mount_option_tokens, args); 1215 switch (token) { 1216 1217 /* 1218 * boolean options: foo/nofoo 1219 */ 1220 case Opt_soft: 1221 mnt->flags |= NFS_MOUNT_SOFT; 1222 break; 1223 case Opt_hard: 1224 mnt->flags &= ~NFS_MOUNT_SOFT; 1225 break; 1226 case Opt_posix: 1227 mnt->flags |= NFS_MOUNT_POSIX; 1228 break; 1229 case Opt_noposix: 1230 mnt->flags &= ~NFS_MOUNT_POSIX; 1231 break; 1232 case Opt_cto: 1233 mnt->flags &= ~NFS_MOUNT_NOCTO; 1234 break; 1235 case Opt_nocto: 1236 mnt->flags |= NFS_MOUNT_NOCTO; 1237 break; 1238 case Opt_ac: 1239 mnt->flags &= ~NFS_MOUNT_NOAC; 1240 break; 1241 case Opt_noac: 1242 mnt->flags |= NFS_MOUNT_NOAC; 1243 break; 1244 case Opt_lock: 1245 mnt->flags &= ~NFS_MOUNT_NONLM; 1246 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1247 NFS_MOUNT_LOCAL_FCNTL); 1248 break; 1249 case Opt_nolock: 1250 mnt->flags |= NFS_MOUNT_NONLM; 1251 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1252 NFS_MOUNT_LOCAL_FCNTL); 1253 break; 1254 case Opt_udp: 1255 mnt->flags &= ~NFS_MOUNT_TCP; 1256 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1257 break; 1258 case Opt_tcp: 1259 mnt->flags |= NFS_MOUNT_TCP; 1260 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1261 break; 1262 case Opt_rdma: 1263 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1264 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1265 xprt_load_transport(p); 1266 break; 1267 case Opt_acl: 1268 mnt->flags &= ~NFS_MOUNT_NOACL; 1269 break; 1270 case Opt_noacl: 1271 mnt->flags |= NFS_MOUNT_NOACL; 1272 break; 1273 case Opt_rdirplus: 1274 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1275 break; 1276 case Opt_nordirplus: 1277 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1278 break; 1279 case Opt_sharecache: 1280 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1281 break; 1282 case Opt_nosharecache: 1283 mnt->flags |= NFS_MOUNT_UNSHARED; 1284 break; 1285 case Opt_resvport: 1286 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1287 break; 1288 case Opt_noresvport: 1289 mnt->flags |= NFS_MOUNT_NORESVPORT; 1290 break; 1291 case Opt_fscache: 1292 mnt->options |= NFS_OPTION_FSCACHE; 1293 kfree(mnt->fscache_uniq); 1294 mnt->fscache_uniq = NULL; 1295 break; 1296 case Opt_nofscache: 1297 mnt->options &= ~NFS_OPTION_FSCACHE; 1298 kfree(mnt->fscache_uniq); 1299 mnt->fscache_uniq = NULL; 1300 break; 1301 case Opt_migration: 1302 mnt->options |= NFS_OPTION_MIGRATION; 1303 break; 1304 case Opt_nomigration: 1305 mnt->options &= NFS_OPTION_MIGRATION; 1306 break; 1307 1308 /* 1309 * options that take numeric values 1310 */ 1311 case Opt_port: 1312 if (nfs_get_option_ul(args, &option) || 1313 option > USHRT_MAX) 1314 goto out_invalid_value; 1315 mnt->nfs_server.port = option; 1316 break; 1317 case Opt_rsize: 1318 if (nfs_get_option_ul(args, &option)) 1319 goto out_invalid_value; 1320 mnt->rsize = option; 1321 break; 1322 case Opt_wsize: 1323 if (nfs_get_option_ul(args, &option)) 1324 goto out_invalid_value; 1325 mnt->wsize = option; 1326 break; 1327 case Opt_bsize: 1328 if (nfs_get_option_ul(args, &option)) 1329 goto out_invalid_value; 1330 mnt->bsize = option; 1331 break; 1332 case Opt_timeo: 1333 if (nfs_get_option_ul(args, &option) || option == 0) 1334 goto out_invalid_value; 1335 mnt->timeo = option; 1336 break; 1337 case Opt_retrans: 1338 if (nfs_get_option_ul(args, &option) || option == 0) 1339 goto out_invalid_value; 1340 mnt->retrans = option; 1341 break; 1342 case Opt_acregmin: 1343 if (nfs_get_option_ul(args, &option)) 1344 goto out_invalid_value; 1345 mnt->acregmin = option; 1346 break; 1347 case Opt_acregmax: 1348 if (nfs_get_option_ul(args, &option)) 1349 goto out_invalid_value; 1350 mnt->acregmax = option; 1351 break; 1352 case Opt_acdirmin: 1353 if (nfs_get_option_ul(args, &option)) 1354 goto out_invalid_value; 1355 mnt->acdirmin = option; 1356 break; 1357 case Opt_acdirmax: 1358 if (nfs_get_option_ul(args, &option)) 1359 goto out_invalid_value; 1360 mnt->acdirmax = option; 1361 break; 1362 case Opt_actimeo: 1363 if (nfs_get_option_ul(args, &option)) 1364 goto out_invalid_value; 1365 mnt->acregmin = mnt->acregmax = 1366 mnt->acdirmin = mnt->acdirmax = option; 1367 break; 1368 case Opt_namelen: 1369 if (nfs_get_option_ul(args, &option)) 1370 goto out_invalid_value; 1371 mnt->namlen = option; 1372 break; 1373 case Opt_mountport: 1374 if (nfs_get_option_ul(args, &option) || 1375 option > USHRT_MAX) 1376 goto out_invalid_value; 1377 mnt->mount_server.port = option; 1378 break; 1379 case Opt_mountvers: 1380 if (nfs_get_option_ul(args, &option) || 1381 option < NFS_MNT_VERSION || 1382 option > NFS_MNT3_VERSION) 1383 goto out_invalid_value; 1384 mnt->mount_server.version = option; 1385 break; 1386 case Opt_minorversion: 1387 if (nfs_get_option_ul(args, &option)) 1388 goto out_invalid_value; 1389 if (option > NFS4_MAX_MINOR_VERSION) 1390 goto out_invalid_value; 1391 mnt->minorversion = option; 1392 break; 1393 1394 /* 1395 * options that take text values 1396 */ 1397 case Opt_nfsvers: 1398 string = match_strdup(args); 1399 if (string == NULL) 1400 goto out_nomem; 1401 rc = nfs_parse_version_string(string, mnt, args); 1402 kfree(string); 1403 if (!rc) 1404 goto out_invalid_value; 1405 break; 1406 case Opt_sec: 1407 string = match_strdup(args); 1408 if (string == NULL) 1409 goto out_nomem; 1410 rc = nfs_parse_security_flavors(string, mnt); 1411 kfree(string); 1412 if (!rc) { 1413 dfprintk(MOUNT, "NFS: unrecognized " 1414 "security flavor\n"); 1415 return 0; 1416 } 1417 break; 1418 case Opt_proto: 1419 string = match_strdup(args); 1420 if (string == NULL) 1421 goto out_nomem; 1422 token = match_token(string, 1423 nfs_xprt_protocol_tokens, args); 1424 1425 protofamily = AF_INET; 1426 switch (token) { 1427 case Opt_xprt_udp6: 1428 protofamily = AF_INET6; 1429 case Opt_xprt_udp: 1430 mnt->flags &= ~NFS_MOUNT_TCP; 1431 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1432 break; 1433 case Opt_xprt_tcp6: 1434 protofamily = AF_INET6; 1435 case Opt_xprt_tcp: 1436 mnt->flags |= NFS_MOUNT_TCP; 1437 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1438 break; 1439 case Opt_xprt_rdma: 1440 /* vector side protocols to TCP */ 1441 mnt->flags |= NFS_MOUNT_TCP; 1442 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1443 xprt_load_transport(string); 1444 break; 1445 default: 1446 dfprintk(MOUNT, "NFS: unrecognized " 1447 "transport protocol\n"); 1448 kfree(string); 1449 return 0; 1450 } 1451 kfree(string); 1452 break; 1453 case Opt_mountproto: 1454 string = match_strdup(args); 1455 if (string == NULL) 1456 goto out_nomem; 1457 token = match_token(string, 1458 nfs_xprt_protocol_tokens, args); 1459 kfree(string); 1460 1461 mountfamily = AF_INET; 1462 switch (token) { 1463 case Opt_xprt_udp6: 1464 mountfamily = AF_INET6; 1465 case Opt_xprt_udp: 1466 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1467 break; 1468 case Opt_xprt_tcp6: 1469 mountfamily = AF_INET6; 1470 case Opt_xprt_tcp: 1471 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1472 break; 1473 case Opt_xprt_rdma: /* not used for side protocols */ 1474 default: 1475 dfprintk(MOUNT, "NFS: unrecognized " 1476 "transport protocol\n"); 1477 return 0; 1478 } 1479 break; 1480 case Opt_addr: 1481 string = match_strdup(args); 1482 if (string == NULL) 1483 goto out_nomem; 1484 mnt->nfs_server.addrlen = 1485 rpc_pton(mnt->net, string, strlen(string), 1486 (struct sockaddr *) 1487 &mnt->nfs_server.address, 1488 sizeof(mnt->nfs_server.address)); 1489 kfree(string); 1490 if (mnt->nfs_server.addrlen == 0) 1491 goto out_invalid_address; 1492 break; 1493 case Opt_clientaddr: 1494 if (nfs_get_option_str(args, &mnt->client_address)) 1495 goto out_nomem; 1496 break; 1497 case Opt_mounthost: 1498 if (nfs_get_option_str(args, 1499 &mnt->mount_server.hostname)) 1500 goto out_nomem; 1501 break; 1502 case Opt_mountaddr: 1503 string = match_strdup(args); 1504 if (string == NULL) 1505 goto out_nomem; 1506 mnt->mount_server.addrlen = 1507 rpc_pton(mnt->net, string, strlen(string), 1508 (struct sockaddr *) 1509 &mnt->mount_server.address, 1510 sizeof(mnt->mount_server.address)); 1511 kfree(string); 1512 if (mnt->mount_server.addrlen == 0) 1513 goto out_invalid_address; 1514 break; 1515 case Opt_lookupcache: 1516 string = match_strdup(args); 1517 if (string == NULL) 1518 goto out_nomem; 1519 token = match_token(string, 1520 nfs_lookupcache_tokens, args); 1521 kfree(string); 1522 switch (token) { 1523 case Opt_lookupcache_all: 1524 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1525 break; 1526 case Opt_lookupcache_positive: 1527 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1528 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1529 break; 1530 case Opt_lookupcache_none: 1531 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1532 break; 1533 default: 1534 dfprintk(MOUNT, "NFS: invalid " 1535 "lookupcache argument\n"); 1536 return 0; 1537 }; 1538 break; 1539 case Opt_fscache_uniq: 1540 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1541 goto out_nomem; 1542 mnt->options |= NFS_OPTION_FSCACHE; 1543 break; 1544 case Opt_local_lock: 1545 string = match_strdup(args); 1546 if (string == NULL) 1547 goto out_nomem; 1548 token = match_token(string, nfs_local_lock_tokens, 1549 args); 1550 kfree(string); 1551 switch (token) { 1552 case Opt_local_lock_all: 1553 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1554 NFS_MOUNT_LOCAL_FCNTL); 1555 break; 1556 case Opt_local_lock_flock: 1557 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1558 break; 1559 case Opt_local_lock_posix: 1560 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1561 break; 1562 case Opt_local_lock_none: 1563 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1564 NFS_MOUNT_LOCAL_FCNTL); 1565 break; 1566 default: 1567 dfprintk(MOUNT, "NFS: invalid " 1568 "local_lock argument\n"); 1569 return 0; 1570 }; 1571 break; 1572 1573 /* 1574 * Special options 1575 */ 1576 case Opt_sloppy: 1577 sloppy = 1; 1578 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1579 break; 1580 case Opt_userspace: 1581 case Opt_deprecated: 1582 dfprintk(MOUNT, "NFS: ignoring mount option " 1583 "'%s'\n", p); 1584 break; 1585 1586 default: 1587 invalid_option = 1; 1588 dfprintk(MOUNT, "NFS: unrecognized mount option " 1589 "'%s'\n", p); 1590 } 1591 } 1592 1593 if (!sloppy && invalid_option) 1594 return 0; 1595 1596 if (mnt->minorversion && mnt->version != 4) 1597 goto out_minorversion_mismatch; 1598 1599 if (mnt->options & NFS_OPTION_MIGRATION && 1600 mnt->version != 4 && mnt->minorversion != 0) 1601 goto out_migration_misuse; 1602 1603 /* 1604 * verify that any proto=/mountproto= options match the address 1605 * families in the addr=/mountaddr= options. 1606 */ 1607 if (protofamily != AF_UNSPEC && 1608 protofamily != mnt->nfs_server.address.ss_family) 1609 goto out_proto_mismatch; 1610 1611 if (mountfamily != AF_UNSPEC) { 1612 if (mnt->mount_server.addrlen) { 1613 if (mountfamily != mnt->mount_server.address.ss_family) 1614 goto out_mountproto_mismatch; 1615 } else { 1616 if (mountfamily != mnt->nfs_server.address.ss_family) 1617 goto out_mountproto_mismatch; 1618 } 1619 } 1620 1621 return 1; 1622 1623 out_mountproto_mismatch: 1624 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1625 "option\n"); 1626 return 0; 1627 out_proto_mismatch: 1628 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1629 return 0; 1630 out_invalid_address: 1631 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1632 return 0; 1633 out_invalid_value: 1634 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1635 return 0; 1636 out_minorversion_mismatch: 1637 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1638 "minorversion=%u\n", mnt->version, mnt->minorversion); 1639 return 0; 1640 out_migration_misuse: 1641 printk(KERN_INFO 1642 "NFS: 'migration' not supported for this NFS version\n"); 1643 return 0; 1644 out_nomem: 1645 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1646 return 0; 1647 out_security_failure: 1648 free_secdata(secdata); 1649 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1650 return 0; 1651 } 1652 1653 /* 1654 * Match the requested auth flavors with the list returned by 1655 * the server. Returns zero and sets the mount's authentication 1656 * flavor on success; returns -EACCES if server does not support 1657 * the requested flavor. 1658 */ 1659 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1660 struct nfs_mount_request *request) 1661 { 1662 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1663 1664 /* 1665 * Certain releases of Linux's mountd return an empty 1666 * flavor list. To prevent behavioral regression with 1667 * these servers (ie. rejecting mounts that used to 1668 * succeed), revert to pre-2.6.32 behavior (no checking) 1669 * if the returned flavor list is empty. 1670 */ 1671 if (server_authlist_len == 0) 1672 return 0; 1673 1674 /* 1675 * We avoid sophisticated negotiating here, as there are 1676 * plenty of cases where we can get it wrong, providing 1677 * either too little or too much security. 1678 * 1679 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1680 * flavor listed first. However, some servers list 1681 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1682 * preferred default, in args->auth_flavors[0] if user 1683 * didn't specify sec= mount option. 1684 */ 1685 for (i = 0; i < args->auth_flavor_len; i++) 1686 for (j = 0; j < server_authlist_len; j++) 1687 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1688 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1689 request->auth_flavs[j]); 1690 args->auth_flavors[0] = request->auth_flavs[j]; 1691 return 0; 1692 } 1693 1694 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1695 nfs_umount(request); 1696 return -EACCES; 1697 } 1698 1699 /* 1700 * Use the remote server's MOUNT service to request the NFS file handle 1701 * corresponding to the provided path. 1702 */ 1703 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1704 struct nfs_fh *root_fh) 1705 { 1706 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1707 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1708 struct nfs_mount_request request = { 1709 .sap = (struct sockaddr *) 1710 &args->mount_server.address, 1711 .dirpath = args->nfs_server.export_path, 1712 .protocol = args->mount_server.protocol, 1713 .fh = root_fh, 1714 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1715 .auth_flav_len = &server_authlist_len, 1716 .auth_flavs = server_authlist, 1717 .net = args->net, 1718 }; 1719 int status; 1720 1721 if (args->mount_server.version == 0) { 1722 switch (args->version) { 1723 default: 1724 args->mount_server.version = NFS_MNT3_VERSION; 1725 break; 1726 case 2: 1727 args->mount_server.version = NFS_MNT_VERSION; 1728 } 1729 } 1730 request.version = args->mount_server.version; 1731 1732 if (args->mount_server.hostname) 1733 request.hostname = args->mount_server.hostname; 1734 else 1735 request.hostname = args->nfs_server.hostname; 1736 1737 /* 1738 * Construct the mount server's address. 1739 */ 1740 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1741 memcpy(request.sap, &args->nfs_server.address, 1742 args->nfs_server.addrlen); 1743 args->mount_server.addrlen = args->nfs_server.addrlen; 1744 } 1745 request.salen = args->mount_server.addrlen; 1746 nfs_set_port(request.sap, &args->mount_server.port, 0); 1747 1748 /* 1749 * Now ask the mount server to map our export path 1750 * to a file handle. 1751 */ 1752 status = nfs_mount(&request); 1753 if (status != 0) { 1754 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1755 request.hostname, status); 1756 return status; 1757 } 1758 1759 /* 1760 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1761 */ 1762 if (args->mount_server.version != NFS_MNT3_VERSION) 1763 return 0; 1764 return nfs_walk_authlist(args, &request); 1765 } 1766 1767 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1768 struct nfs_mount_info *mount_info, 1769 struct nfs_subversion *nfs_mod) 1770 { 1771 int status; 1772 struct nfs_server *server; 1773 1774 if (mount_info->parsed->need_mount) { 1775 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh); 1776 if (status) 1777 return ERR_PTR(status); 1778 } 1779 1780 /* Get a volume representation */ 1781 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1782 if (IS_ERR(server)) 1783 return ERR_CAST(server); 1784 1785 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1786 } 1787 EXPORT_SYMBOL_GPL(nfs_try_mount); 1788 1789 /* 1790 * Split "dev_name" into "hostname:export_path". 1791 * 1792 * The leftmost colon demarks the split between the server's hostname 1793 * and the export path. If the hostname starts with a left square 1794 * bracket, then it may contain colons. 1795 * 1796 * Note: caller frees hostname and export path, even on error. 1797 */ 1798 static int nfs_parse_devname(const char *dev_name, 1799 char **hostname, size_t maxnamlen, 1800 char **export_path, size_t maxpathlen) 1801 { 1802 size_t len; 1803 char *end; 1804 1805 /* Is the host name protected with square brakcets? */ 1806 if (*dev_name == '[') { 1807 end = strchr(++dev_name, ']'); 1808 if (end == NULL || end[1] != ':') 1809 goto out_bad_devname; 1810 1811 len = end - dev_name; 1812 end++; 1813 } else { 1814 char *comma; 1815 1816 end = strchr(dev_name, ':'); 1817 if (end == NULL) 1818 goto out_bad_devname; 1819 len = end - dev_name; 1820 1821 /* kill possible hostname list: not supported */ 1822 comma = strchr(dev_name, ','); 1823 if (comma != NULL && comma < end) 1824 *comma = 0; 1825 } 1826 1827 if (len > maxnamlen) 1828 goto out_hostname; 1829 1830 /* N.B. caller will free nfs_server.hostname in all cases */ 1831 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1832 if (*hostname == NULL) 1833 goto out_nomem; 1834 len = strlen(++end); 1835 if (len > maxpathlen) 1836 goto out_path; 1837 *export_path = kstrndup(end, len, GFP_KERNEL); 1838 if (!*export_path) 1839 goto out_nomem; 1840 1841 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1842 return 0; 1843 1844 out_bad_devname: 1845 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1846 return -EINVAL; 1847 1848 out_nomem: 1849 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1850 return -ENOMEM; 1851 1852 out_hostname: 1853 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1854 return -ENAMETOOLONG; 1855 1856 out_path: 1857 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1858 return -ENAMETOOLONG; 1859 } 1860 1861 /* 1862 * Validate the NFS2/NFS3 mount data 1863 * - fills in the mount root filehandle 1864 * 1865 * For option strings, user space handles the following behaviors: 1866 * 1867 * + DNS: mapping server host name to IP address ("addr=" option) 1868 * 1869 * + failure mode: how to behave if a mount request can't be handled 1870 * immediately ("fg/bg" option) 1871 * 1872 * + retry: how often to retry a mount request ("retry=" option) 1873 * 1874 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1875 * mountproto=tcp after mountproto=udp, and so on 1876 */ 1877 static int nfs23_validate_mount_data(void *options, 1878 struct nfs_parsed_mount_data *args, 1879 struct nfs_fh *mntfh, 1880 const char *dev_name) 1881 { 1882 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1883 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1884 1885 if (data == NULL) 1886 goto out_no_data; 1887 1888 args->version = NFS_DEFAULT_VERSION; 1889 switch (data->version) { 1890 case 1: 1891 data->namlen = 0; 1892 case 2: 1893 data->bsize = 0; 1894 case 3: 1895 if (data->flags & NFS_MOUNT_VER3) 1896 goto out_no_v3; 1897 data->root.size = NFS2_FHSIZE; 1898 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1899 case 4: 1900 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1901 goto out_no_sec; 1902 case 5: 1903 memset(data->context, 0, sizeof(data->context)); 1904 case 6: 1905 if (data->flags & NFS_MOUNT_VER3) { 1906 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1907 goto out_invalid_fh; 1908 mntfh->size = data->root.size; 1909 args->version = 3; 1910 } else { 1911 mntfh->size = NFS2_FHSIZE; 1912 args->version = 2; 1913 } 1914 1915 1916 memcpy(mntfh->data, data->root.data, mntfh->size); 1917 if (mntfh->size < sizeof(mntfh->data)) 1918 memset(mntfh->data + mntfh->size, 0, 1919 sizeof(mntfh->data) - mntfh->size); 1920 1921 /* 1922 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1923 * can deal with. 1924 */ 1925 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1926 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1927 args->rsize = data->rsize; 1928 args->wsize = data->wsize; 1929 args->timeo = data->timeo; 1930 args->retrans = data->retrans; 1931 args->acregmin = data->acregmin; 1932 args->acregmax = data->acregmax; 1933 args->acdirmin = data->acdirmin; 1934 args->acdirmax = data->acdirmax; 1935 args->need_mount = false; 1936 1937 memcpy(sap, &data->addr, sizeof(data->addr)); 1938 args->nfs_server.addrlen = sizeof(data->addr); 1939 args->nfs_server.port = ntohs(data->addr.sin_port); 1940 if (!nfs_verify_server_address(sap)) 1941 goto out_no_address; 1942 1943 if (!(data->flags & NFS_MOUNT_TCP)) 1944 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1945 /* N.B. caller will free nfs_server.hostname in all cases */ 1946 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1947 args->namlen = data->namlen; 1948 args->bsize = data->bsize; 1949 1950 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1951 args->auth_flavors[0] = data->pseudoflavor; 1952 if (!args->nfs_server.hostname) 1953 goto out_nomem; 1954 1955 if (!(data->flags & NFS_MOUNT_NONLM)) 1956 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1957 NFS_MOUNT_LOCAL_FCNTL); 1958 else 1959 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1960 NFS_MOUNT_LOCAL_FCNTL); 1961 /* 1962 * The legacy version 6 binary mount data from userspace has a 1963 * field used only to transport selinux information into the 1964 * the kernel. To continue to support that functionality we 1965 * have a touch of selinux knowledge here in the NFS code. The 1966 * userspace code converted context=blah to just blah so we are 1967 * converting back to the full string selinux understands. 1968 */ 1969 if (data->context[0]){ 1970 #ifdef CONFIG_SECURITY_SELINUX 1971 int rc; 1972 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1973 if (!opts_str) 1974 return -ENOMEM; 1975 strcpy(opts_str, "context="); 1976 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1977 strcat(opts_str, &data->context[0]); 1978 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1979 kfree(opts_str); 1980 if (rc) 1981 return rc; 1982 #else 1983 return -EINVAL; 1984 #endif 1985 } 1986 1987 break; 1988 default: 1989 return NFS_TEXT_DATA; 1990 } 1991 1992 #if !IS_ENABLED(CONFIG_NFS_V3) 1993 if (args->version == 3) 1994 goto out_v3_not_compiled; 1995 #endif /* !CONFIG_NFS_V3 */ 1996 1997 return 0; 1998 1999 out_no_data: 2000 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2001 return -EINVAL; 2002 2003 out_no_v3: 2004 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2005 data->version); 2006 return -EINVAL; 2007 2008 out_no_sec: 2009 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2010 return -EINVAL; 2011 2012 #if !IS_ENABLED(CONFIG_NFS_V3) 2013 out_v3_not_compiled: 2014 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 2015 return -EPROTONOSUPPORT; 2016 #endif /* !CONFIG_NFS_V3 */ 2017 2018 out_nomem: 2019 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2020 return -ENOMEM; 2021 2022 out_no_address: 2023 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2024 return -EINVAL; 2025 2026 out_invalid_fh: 2027 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2028 return -EINVAL; 2029 } 2030 2031 #if IS_ENABLED(CONFIG_NFS_V4) 2032 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2033 void *options, 2034 struct nfs_parsed_mount_data *args, 2035 struct nfs_fh *mntfh, 2036 const char *dev_name) 2037 { 2038 if (fs_type == &nfs_fs_type) 2039 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2040 return nfs4_validate_mount_data(options, args, dev_name); 2041 } 2042 #else 2043 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2044 void *options, 2045 struct nfs_parsed_mount_data *args, 2046 struct nfs_fh *mntfh, 2047 const char *dev_name) 2048 { 2049 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2050 } 2051 #endif 2052 2053 static int nfs_validate_text_mount_data(void *options, 2054 struct nfs_parsed_mount_data *args, 2055 const char *dev_name) 2056 { 2057 int port = 0; 2058 int max_namelen = PAGE_SIZE; 2059 int max_pathlen = NFS_MAXPATHLEN; 2060 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2061 2062 if (nfs_parse_mount_options((char *)options, args) == 0) 2063 return -EINVAL; 2064 2065 if (!nfs_verify_server_address(sap)) 2066 goto out_no_address; 2067 2068 if (args->version == 4) { 2069 #if IS_ENABLED(CONFIG_NFS_V4) 2070 port = NFS_PORT; 2071 max_namelen = NFS4_MAXNAMLEN; 2072 max_pathlen = NFS4_MAXPATHLEN; 2073 nfs_validate_transport_protocol(args); 2074 nfs4_validate_mount_flags(args); 2075 #else 2076 goto out_v4_not_compiled; 2077 #endif /* CONFIG_NFS_V4 */ 2078 } else 2079 nfs_set_mount_transport_protocol(args); 2080 2081 nfs_set_port(sap, &args->nfs_server.port, port); 2082 2083 if (args->auth_flavor_len > 1) 2084 goto out_bad_auth; 2085 2086 return nfs_parse_devname(dev_name, 2087 &args->nfs_server.hostname, 2088 max_namelen, 2089 &args->nfs_server.export_path, 2090 max_pathlen); 2091 2092 #if !IS_ENABLED(CONFIG_NFS_V4) 2093 out_v4_not_compiled: 2094 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2095 return -EPROTONOSUPPORT; 2096 #endif /* !CONFIG_NFS_V4 */ 2097 2098 out_no_address: 2099 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2100 return -EINVAL; 2101 2102 out_bad_auth: 2103 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n"); 2104 return -EINVAL; 2105 } 2106 2107 static int 2108 nfs_compare_remount_data(struct nfs_server *nfss, 2109 struct nfs_parsed_mount_data *data) 2110 { 2111 if (data->flags != nfss->flags || 2112 data->rsize != nfss->rsize || 2113 data->wsize != nfss->wsize || 2114 data->retrans != nfss->client->cl_timeout->to_retries || 2115 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2116 data->acregmin != nfss->acregmin / HZ || 2117 data->acregmax != nfss->acregmax / HZ || 2118 data->acdirmin != nfss->acdirmin / HZ || 2119 data->acdirmax != nfss->acdirmax / HZ || 2120 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2121 data->nfs_server.port != nfss->port || 2122 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2123 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2124 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2125 return -EINVAL; 2126 2127 return 0; 2128 } 2129 2130 int 2131 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2132 { 2133 int error; 2134 struct nfs_server *nfss = sb->s_fs_info; 2135 struct nfs_parsed_mount_data *data; 2136 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2137 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2138 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2139 2140 /* 2141 * Userspace mount programs that send binary options generally send 2142 * them populated with default values. We have no way to know which 2143 * ones were explicitly specified. Fall back to legacy behavior and 2144 * just return success. 2145 */ 2146 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2147 (nfsvers <= 3 && (!options || (options->version >= 1 && 2148 options->version <= 6)))) 2149 return 0; 2150 2151 data = kzalloc(sizeof(*data), GFP_KERNEL); 2152 if (data == NULL) 2153 return -ENOMEM; 2154 2155 /* fill out struct with values from existing mount */ 2156 data->flags = nfss->flags; 2157 data->rsize = nfss->rsize; 2158 data->wsize = nfss->wsize; 2159 data->retrans = nfss->client->cl_timeout->to_retries; 2160 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2161 data->acregmin = nfss->acregmin / HZ; 2162 data->acregmax = nfss->acregmax / HZ; 2163 data->acdirmin = nfss->acdirmin / HZ; 2164 data->acdirmax = nfss->acdirmax / HZ; 2165 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2166 data->nfs_server.port = nfss->port; 2167 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2168 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2169 data->nfs_server.addrlen); 2170 2171 /* overwrite those values with any that were specified */ 2172 error = nfs_parse_mount_options((char *)options, data); 2173 if (error < 0) 2174 goto out; 2175 2176 /* 2177 * noac is a special case. It implies -o sync, but that's not 2178 * necessarily reflected in the mtab options. do_remount_sb 2179 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2180 * remount options, so we have to explicitly reset it. 2181 */ 2182 if (data->flags & NFS_MOUNT_NOAC) 2183 *flags |= MS_SYNCHRONOUS; 2184 2185 /* compare new mount options with old ones */ 2186 error = nfs_compare_remount_data(nfss, data); 2187 out: 2188 kfree(data); 2189 return error; 2190 } 2191 EXPORT_SYMBOL_GPL(nfs_remount); 2192 2193 /* 2194 * Initialise the common bits of the superblock 2195 */ 2196 inline void nfs_initialise_sb(struct super_block *sb) 2197 { 2198 struct nfs_server *server = NFS_SB(sb); 2199 2200 sb->s_magic = NFS_SUPER_MAGIC; 2201 2202 /* We probably want something more informative here */ 2203 snprintf(sb->s_id, sizeof(sb->s_id), 2204 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2205 2206 if (sb->s_blocksize == 0) 2207 sb->s_blocksize = nfs_block_bits(server->wsize, 2208 &sb->s_blocksize_bits); 2209 2210 sb->s_bdi = &server->backing_dev_info; 2211 2212 nfs_super_set_maxbytes(sb, server->maxfilesize); 2213 } 2214 2215 /* 2216 * Finish setting up an NFS2/3 superblock 2217 */ 2218 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2219 { 2220 struct nfs_parsed_mount_data *data = mount_info->parsed; 2221 struct nfs_server *server = NFS_SB(sb); 2222 2223 sb->s_blocksize_bits = 0; 2224 sb->s_blocksize = 0; 2225 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2226 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2227 if (data && data->bsize) 2228 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2229 2230 if (server->nfs_client->rpc_ops->version != 2) { 2231 /* The VFS shouldn't apply the umask to mode bits. We will do 2232 * so ourselves when necessary. 2233 */ 2234 sb->s_flags |= MS_POSIXACL; 2235 sb->s_time_gran = 1; 2236 } 2237 2238 nfs_initialise_sb(sb); 2239 } 2240 EXPORT_SYMBOL_GPL(nfs_fill_super); 2241 2242 /* 2243 * Finish setting up a cloned NFS2/3/4 superblock 2244 */ 2245 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2246 { 2247 const struct super_block *old_sb = mount_info->cloned->sb; 2248 struct nfs_server *server = NFS_SB(sb); 2249 2250 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2251 sb->s_blocksize = old_sb->s_blocksize; 2252 sb->s_maxbytes = old_sb->s_maxbytes; 2253 sb->s_xattr = old_sb->s_xattr; 2254 sb->s_op = old_sb->s_op; 2255 sb->s_time_gran = 1; 2256 2257 if (server->nfs_client->rpc_ops->version != 2) { 2258 /* The VFS shouldn't apply the umask to mode bits. We will do 2259 * so ourselves when necessary. 2260 */ 2261 sb->s_flags |= MS_POSIXACL; 2262 } 2263 2264 nfs_initialise_sb(sb); 2265 } 2266 2267 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2268 { 2269 const struct nfs_server *a = s->s_fs_info; 2270 const struct rpc_clnt *clnt_a = a->client; 2271 const struct rpc_clnt *clnt_b = b->client; 2272 2273 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2274 goto Ebusy; 2275 if (a->nfs_client != b->nfs_client) 2276 goto Ebusy; 2277 if (a->flags != b->flags) 2278 goto Ebusy; 2279 if (a->wsize != b->wsize) 2280 goto Ebusy; 2281 if (a->rsize != b->rsize) 2282 goto Ebusy; 2283 if (a->acregmin != b->acregmin) 2284 goto Ebusy; 2285 if (a->acregmax != b->acregmax) 2286 goto Ebusy; 2287 if (a->acdirmin != b->acdirmin) 2288 goto Ebusy; 2289 if (a->acdirmax != b->acdirmax) 2290 goto Ebusy; 2291 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2292 goto Ebusy; 2293 return 1; 2294 Ebusy: 2295 return 0; 2296 } 2297 2298 struct nfs_sb_mountdata { 2299 struct nfs_server *server; 2300 int mntflags; 2301 }; 2302 2303 static int nfs_set_super(struct super_block *s, void *data) 2304 { 2305 struct nfs_sb_mountdata *sb_mntdata = data; 2306 struct nfs_server *server = sb_mntdata->server; 2307 int ret; 2308 2309 s->s_flags = sb_mntdata->mntflags; 2310 s->s_fs_info = server; 2311 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2312 ret = set_anon_super(s, server); 2313 if (ret == 0) 2314 server->s_dev = s->s_dev; 2315 return ret; 2316 } 2317 2318 static int nfs_compare_super_address(struct nfs_server *server1, 2319 struct nfs_server *server2) 2320 { 2321 struct sockaddr *sap1, *sap2; 2322 2323 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2324 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2325 2326 if (sap1->sa_family != sap2->sa_family) 2327 return 0; 2328 2329 switch (sap1->sa_family) { 2330 case AF_INET: { 2331 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2332 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2333 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2334 return 0; 2335 if (sin1->sin_port != sin2->sin_port) 2336 return 0; 2337 break; 2338 } 2339 case AF_INET6: { 2340 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2341 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2342 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2343 return 0; 2344 if (sin1->sin6_port != sin2->sin6_port) 2345 return 0; 2346 break; 2347 } 2348 default: 2349 return 0; 2350 } 2351 2352 return 1; 2353 } 2354 2355 static int nfs_compare_super(struct super_block *sb, void *data) 2356 { 2357 struct nfs_sb_mountdata *sb_mntdata = data; 2358 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2359 int mntflags = sb_mntdata->mntflags; 2360 2361 if (!nfs_compare_super_address(old, server)) 2362 return 0; 2363 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2364 if (old->flags & NFS_MOUNT_UNSHARED) 2365 return 0; 2366 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2367 return 0; 2368 return nfs_compare_mount_options(sb, server, mntflags); 2369 } 2370 2371 #ifdef CONFIG_NFS_FSCACHE 2372 static void nfs_get_cache_cookie(struct super_block *sb, 2373 struct nfs_parsed_mount_data *parsed, 2374 struct nfs_clone_mount *cloned) 2375 { 2376 char *uniq = NULL; 2377 int ulen = 0; 2378 2379 if (parsed && parsed->fscache_uniq) { 2380 uniq = parsed->fscache_uniq; 2381 ulen = strlen(parsed->fscache_uniq); 2382 } else if (cloned) { 2383 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2384 if (mnt_s->fscache_key) { 2385 uniq = mnt_s->fscache_key->key.uniquifier; 2386 ulen = mnt_s->fscache_key->key.uniq_len; 2387 }; 2388 } 2389 2390 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2391 } 2392 #else 2393 static void nfs_get_cache_cookie(struct super_block *sb, 2394 struct nfs_parsed_mount_data *parsed, 2395 struct nfs_clone_mount *cloned) 2396 { 2397 } 2398 #endif 2399 2400 static int nfs_bdi_register(struct nfs_server *server) 2401 { 2402 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2403 } 2404 2405 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2406 struct nfs_mount_info *mount_info) 2407 { 2408 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts); 2409 } 2410 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2411 2412 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2413 struct nfs_mount_info *mount_info) 2414 { 2415 /* clone any lsm security options from the parent to the new sb */ 2416 security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2417 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2418 return -ESTALE; 2419 return 0; 2420 } 2421 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2422 2423 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2424 int flags, const char *dev_name, 2425 struct nfs_mount_info *mount_info, 2426 struct nfs_subversion *nfs_mod) 2427 { 2428 struct super_block *s; 2429 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2430 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2431 struct nfs_sb_mountdata sb_mntdata = { 2432 .mntflags = flags, 2433 .server = server, 2434 }; 2435 int error; 2436 2437 if (server->flags & NFS_MOUNT_UNSHARED) 2438 compare_super = NULL; 2439 2440 /* -o noac implies -o sync */ 2441 if (server->flags & NFS_MOUNT_NOAC) 2442 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2443 2444 /* Get a superblock - note that we may end up sharing one that already exists */ 2445 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2446 if (IS_ERR(s)) { 2447 mntroot = ERR_CAST(s); 2448 goto out_err_nosb; 2449 } 2450 2451 if (s->s_fs_info != server) { 2452 nfs_free_server(server); 2453 server = NULL; 2454 } else { 2455 error = nfs_bdi_register(server); 2456 if (error) { 2457 mntroot = ERR_PTR(error); 2458 goto error_splat_bdi; 2459 } 2460 } 2461 2462 if (!s->s_root) { 2463 /* initial superblock/root creation */ 2464 mount_info->fill_super(s, mount_info); 2465 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2466 } 2467 2468 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2469 if (IS_ERR(mntroot)) 2470 goto error_splat_super; 2471 2472 error = mount_info->set_security(s, mntroot, mount_info); 2473 if (error) 2474 goto error_splat_root; 2475 2476 s->s_flags |= MS_ACTIVE; 2477 2478 out: 2479 return mntroot; 2480 2481 out_err_nosb: 2482 nfs_free_server(server); 2483 goto out; 2484 2485 error_splat_root: 2486 dput(mntroot); 2487 mntroot = ERR_PTR(error); 2488 error_splat_super: 2489 if (server && !s->s_root) 2490 bdi_unregister(&server->backing_dev_info); 2491 error_splat_bdi: 2492 deactivate_locked_super(s); 2493 goto out; 2494 } 2495 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2496 2497 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2498 int flags, const char *dev_name, void *raw_data) 2499 { 2500 struct nfs_mount_info mount_info = { 2501 .fill_super = nfs_fill_super, 2502 .set_security = nfs_set_sb_security, 2503 }; 2504 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2505 struct nfs_subversion *nfs_mod; 2506 int error; 2507 2508 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2509 mount_info.mntfh = nfs_alloc_fhandle(); 2510 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2511 goto out; 2512 2513 /* Validate the mount data */ 2514 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2515 if (error == NFS_TEXT_DATA) 2516 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2517 if (error < 0) { 2518 mntroot = ERR_PTR(error); 2519 goto out; 2520 } 2521 2522 nfs_mod = get_nfs_version(mount_info.parsed->version); 2523 if (IS_ERR(nfs_mod)) { 2524 mntroot = ERR_CAST(nfs_mod); 2525 goto out; 2526 } 2527 2528 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2529 2530 put_nfs_version(nfs_mod); 2531 out: 2532 nfs_free_parsed_mount_data(mount_info.parsed); 2533 nfs_free_fhandle(mount_info.mntfh); 2534 return mntroot; 2535 } 2536 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2537 2538 /* 2539 * Ensure that we unregister the bdi before kill_anon_super 2540 * releases the device name 2541 */ 2542 void nfs_put_super(struct super_block *s) 2543 { 2544 struct nfs_server *server = NFS_SB(s); 2545 2546 bdi_unregister(&server->backing_dev_info); 2547 } 2548 EXPORT_SYMBOL_GPL(nfs_put_super); 2549 2550 /* 2551 * Destroy an NFS2/3 superblock 2552 */ 2553 void nfs_kill_super(struct super_block *s) 2554 { 2555 struct nfs_server *server = NFS_SB(s); 2556 2557 kill_anon_super(s); 2558 nfs_fscache_release_super_cookie(s); 2559 nfs_free_server(server); 2560 } 2561 EXPORT_SYMBOL_GPL(nfs_kill_super); 2562 2563 /* 2564 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2565 */ 2566 static struct dentry * 2567 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2568 const char *dev_name, void *raw_data) 2569 { 2570 struct nfs_clone_mount *data = raw_data; 2571 struct nfs_mount_info mount_info = { 2572 .fill_super = nfs_clone_super, 2573 .set_security = nfs_clone_sb_security, 2574 .cloned = data, 2575 }; 2576 struct nfs_server *server; 2577 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2578 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2579 int error; 2580 2581 dprintk("--> nfs_xdev_mount_common()\n"); 2582 2583 mount_info.mntfh = mount_info.cloned->fh; 2584 2585 /* create a new volume representation */ 2586 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2587 if (IS_ERR(server)) { 2588 error = PTR_ERR(server); 2589 goto out_err; 2590 } 2591 2592 mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod); 2593 dprintk("<-- nfs_xdev_mount_common() = 0\n"); 2594 out: 2595 return mntroot; 2596 2597 out_err: 2598 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error); 2599 goto out; 2600 } 2601 2602 #if IS_ENABLED(CONFIG_NFS_V4) 2603 2604 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2605 { 2606 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2607 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2608 } 2609 2610 /* 2611 * Validate NFSv4 mount options 2612 */ 2613 static int nfs4_validate_mount_data(void *options, 2614 struct nfs_parsed_mount_data *args, 2615 const char *dev_name) 2616 { 2617 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2618 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2619 char *c; 2620 2621 if (data == NULL) 2622 goto out_no_data; 2623 2624 args->version = 4; 2625 2626 switch (data->version) { 2627 case 1: 2628 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2629 goto out_no_address; 2630 if (data->host_addrlen == 0) 2631 goto out_no_address; 2632 args->nfs_server.addrlen = data->host_addrlen; 2633 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2634 return -EFAULT; 2635 if (!nfs_verify_server_address(sap)) 2636 goto out_no_address; 2637 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2638 2639 if (data->auth_flavourlen) { 2640 if (data->auth_flavourlen > 1) 2641 goto out_inval_auth; 2642 if (copy_from_user(&args->auth_flavors[0], 2643 data->auth_flavours, 2644 sizeof(args->auth_flavors[0]))) 2645 return -EFAULT; 2646 } 2647 2648 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2649 if (IS_ERR(c)) 2650 return PTR_ERR(c); 2651 args->nfs_server.hostname = c; 2652 2653 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2654 if (IS_ERR(c)) 2655 return PTR_ERR(c); 2656 args->nfs_server.export_path = c; 2657 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2658 2659 c = strndup_user(data->client_addr.data, 16); 2660 if (IS_ERR(c)) 2661 return PTR_ERR(c); 2662 args->client_address = c; 2663 2664 /* 2665 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2666 * can deal with. 2667 */ 2668 2669 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2670 args->rsize = data->rsize; 2671 args->wsize = data->wsize; 2672 args->timeo = data->timeo; 2673 args->retrans = data->retrans; 2674 args->acregmin = data->acregmin; 2675 args->acregmax = data->acregmax; 2676 args->acdirmin = data->acdirmin; 2677 args->acdirmax = data->acdirmax; 2678 args->nfs_server.protocol = data->proto; 2679 nfs_validate_transport_protocol(args); 2680 2681 break; 2682 default: 2683 return NFS_TEXT_DATA; 2684 } 2685 2686 return 0; 2687 2688 out_no_data: 2689 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2690 return -EINVAL; 2691 2692 out_inval_auth: 2693 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2694 data->auth_flavourlen); 2695 return -EINVAL; 2696 2697 out_no_address: 2698 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2699 return -EINVAL; 2700 } 2701 2702 /* 2703 * NFS v4 module parameters need to stay in the 2704 * NFS client for backwards compatibility 2705 */ 2706 unsigned int nfs_callback_set_tcpport; 2707 unsigned short nfs_callback_tcpport; 2708 /* Default cache timeout is 10 minutes */ 2709 unsigned int nfs_idmap_cache_timeout = 600; 2710 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2711 bool nfs4_disable_idmapping = true; 2712 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2713 unsigned short send_implementation_id = 1; 2714 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2715 2716 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2717 EXPORT_SYMBOL_GPL(nfs_callback_tcpport); 2718 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2719 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2720 EXPORT_SYMBOL_GPL(max_session_slots); 2721 EXPORT_SYMBOL_GPL(send_implementation_id); 2722 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2723 2724 #define NFS_CALLBACK_MAXPORTNR (65535U) 2725 2726 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2727 { 2728 unsigned long num; 2729 int ret; 2730 2731 if (!val) 2732 return -EINVAL; 2733 ret = kstrtoul(val, 0, &num); 2734 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2735 return -EINVAL; 2736 *((unsigned int *)kp->arg) = num; 2737 return 0; 2738 } 2739 static struct kernel_param_ops param_ops_portnr = { 2740 .set = param_set_portnr, 2741 .get = param_get_uint, 2742 }; 2743 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2744 2745 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2746 module_param(nfs_idmap_cache_timeout, int, 0644); 2747 module_param(nfs4_disable_idmapping, bool, 0644); 2748 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2749 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2750 MODULE_PARM_DESC(nfs4_disable_idmapping, 2751 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2752 module_param(max_session_slots, ushort, 0644); 2753 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2754 "requests the client will negotiate"); 2755 module_param(send_implementation_id, ushort, 0644); 2756 MODULE_PARM_DESC(send_implementation_id, 2757 "Send implementation ID with NFSv4.1 exchange_id"); 2758 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2759 MODULE_ALIAS("nfs4"); 2760 2761 #endif /* CONFIG_NFS_V4 */ 2762