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 "nfs4session.h" 68 #include "pnfs.h" 69 #include "nfs.h" 70 71 #define NFSDBG_FACILITY NFSDBG_VFS 72 #define NFS_TEXT_DATA 1 73 74 #if IS_ENABLED(CONFIG_NFS_V3) 75 #define NFS_DEFAULT_VERSION 3 76 #else 77 #define NFS_DEFAULT_VERSION 2 78 #endif 79 80 enum { 81 /* Mount options that take no arguments */ 82 Opt_soft, Opt_hard, 83 Opt_posix, Opt_noposix, 84 Opt_cto, Opt_nocto, 85 Opt_ac, Opt_noac, 86 Opt_lock, Opt_nolock, 87 Opt_udp, Opt_tcp, Opt_rdma, 88 Opt_acl, Opt_noacl, 89 Opt_rdirplus, Opt_nordirplus, 90 Opt_sharecache, Opt_nosharecache, 91 Opt_resvport, Opt_noresvport, 92 Opt_fscache, Opt_nofscache, 93 Opt_migration, Opt_nomigration, 94 95 /* Mount options that take integer arguments */ 96 Opt_port, 97 Opt_rsize, Opt_wsize, Opt_bsize, 98 Opt_timeo, Opt_retrans, 99 Opt_acregmin, Opt_acregmax, 100 Opt_acdirmin, Opt_acdirmax, 101 Opt_actimeo, 102 Opt_namelen, 103 Opt_mountport, 104 Opt_mountvers, 105 Opt_minorversion, 106 107 /* Mount options that take string arguments */ 108 Opt_nfsvers, 109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, 110 Opt_addr, Opt_mountaddr, Opt_clientaddr, 111 Opt_lookupcache, 112 Opt_fscache_uniq, 113 Opt_local_lock, 114 115 /* Special mount options */ 116 Opt_userspace, Opt_deprecated, Opt_sloppy, 117 118 Opt_err 119 }; 120 121 static const match_table_t nfs_mount_option_tokens = { 122 { Opt_userspace, "bg" }, 123 { Opt_userspace, "fg" }, 124 { Opt_userspace, "retry=%s" }, 125 126 { Opt_sloppy, "sloppy" }, 127 128 { Opt_soft, "soft" }, 129 { Opt_hard, "hard" }, 130 { Opt_deprecated, "intr" }, 131 { Opt_deprecated, "nointr" }, 132 { Opt_posix, "posix" }, 133 { Opt_noposix, "noposix" }, 134 { Opt_cto, "cto" }, 135 { Opt_nocto, "nocto" }, 136 { Opt_ac, "ac" }, 137 { Opt_noac, "noac" }, 138 { Opt_lock, "lock" }, 139 { Opt_nolock, "nolock" }, 140 { Opt_udp, "udp" }, 141 { Opt_tcp, "tcp" }, 142 { Opt_rdma, "rdma" }, 143 { Opt_acl, "acl" }, 144 { Opt_noacl, "noacl" }, 145 { Opt_rdirplus, "rdirplus" }, 146 { Opt_nordirplus, "nordirplus" }, 147 { Opt_sharecache, "sharecache" }, 148 { Opt_nosharecache, "nosharecache" }, 149 { Opt_resvport, "resvport" }, 150 { Opt_noresvport, "noresvport" }, 151 { Opt_fscache, "fsc" }, 152 { Opt_nofscache, "nofsc" }, 153 { Opt_migration, "migration" }, 154 { Opt_nomigration, "nomigration" }, 155 156 { Opt_port, "port=%s" }, 157 { Opt_rsize, "rsize=%s" }, 158 { Opt_wsize, "wsize=%s" }, 159 { Opt_bsize, "bsize=%s" }, 160 { Opt_timeo, "timeo=%s" }, 161 { Opt_retrans, "retrans=%s" }, 162 { Opt_acregmin, "acregmin=%s" }, 163 { Opt_acregmax, "acregmax=%s" }, 164 { Opt_acdirmin, "acdirmin=%s" }, 165 { Opt_acdirmax, "acdirmax=%s" }, 166 { Opt_actimeo, "actimeo=%s" }, 167 { Opt_namelen, "namlen=%s" }, 168 { Opt_mountport, "mountport=%s" }, 169 { Opt_mountvers, "mountvers=%s" }, 170 { Opt_minorversion, "minorversion=%s" }, 171 172 { Opt_nfsvers, "nfsvers=%s" }, 173 { Opt_nfsvers, "vers=%s" }, 174 175 { Opt_sec, "sec=%s" }, 176 { Opt_proto, "proto=%s" }, 177 { Opt_mountproto, "mountproto=%s" }, 178 { Opt_addr, "addr=%s" }, 179 { Opt_clientaddr, "clientaddr=%s" }, 180 { Opt_mounthost, "mounthost=%s" }, 181 { Opt_mountaddr, "mountaddr=%s" }, 182 183 { Opt_lookupcache, "lookupcache=%s" }, 184 { Opt_fscache_uniq, "fsc=%s" }, 185 { Opt_local_lock, "local_lock=%s" }, 186 187 /* The following needs to be listed after all other options */ 188 { Opt_nfsvers, "v%s" }, 189 190 { Opt_err, NULL } 191 }; 192 193 enum { 194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma, 195 196 Opt_xprt_err 197 }; 198 199 static const match_table_t nfs_xprt_protocol_tokens = { 200 { Opt_xprt_udp, "udp" }, 201 { Opt_xprt_udp6, "udp6" }, 202 { Opt_xprt_tcp, "tcp" }, 203 { Opt_xprt_tcp6, "tcp6" }, 204 { Opt_xprt_rdma, "rdma" }, 205 206 { Opt_xprt_err, NULL } 207 }; 208 209 enum { 210 Opt_sec_none, Opt_sec_sys, 211 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, 212 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, 213 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, 214 215 Opt_sec_err 216 }; 217 218 static const match_table_t nfs_secflavor_tokens = { 219 { Opt_sec_none, "none" }, 220 { Opt_sec_none, "null" }, 221 { Opt_sec_sys, "sys" }, 222 223 { Opt_sec_krb5, "krb5" }, 224 { Opt_sec_krb5i, "krb5i" }, 225 { Opt_sec_krb5p, "krb5p" }, 226 227 { Opt_sec_lkey, "lkey" }, 228 { Opt_sec_lkeyi, "lkeyi" }, 229 { Opt_sec_lkeyp, "lkeyp" }, 230 231 { Opt_sec_spkm, "spkm3" }, 232 { Opt_sec_spkmi, "spkm3i" }, 233 { Opt_sec_spkmp, "spkm3p" }, 234 235 { Opt_sec_err, NULL } 236 }; 237 238 enum { 239 Opt_lookupcache_all, Opt_lookupcache_positive, 240 Opt_lookupcache_none, 241 242 Opt_lookupcache_err 243 }; 244 245 static match_table_t nfs_lookupcache_tokens = { 246 { Opt_lookupcache_all, "all" }, 247 { Opt_lookupcache_positive, "pos" }, 248 { Opt_lookupcache_positive, "positive" }, 249 { Opt_lookupcache_none, "none" }, 250 251 { Opt_lookupcache_err, NULL } 252 }; 253 254 enum { 255 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix, 256 Opt_local_lock_none, 257 258 Opt_local_lock_err 259 }; 260 261 static match_table_t nfs_local_lock_tokens = { 262 { Opt_local_lock_all, "all" }, 263 { Opt_local_lock_flock, "flock" }, 264 { Opt_local_lock_posix, "posix" }, 265 { Opt_local_lock_none, "none" }, 266 267 { Opt_local_lock_err, NULL } 268 }; 269 270 enum { 271 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0, 272 Opt_vers_4_1, 273 274 Opt_vers_err 275 }; 276 277 static match_table_t nfs_vers_tokens = { 278 { Opt_vers_2, "2" }, 279 { Opt_vers_3, "3" }, 280 { Opt_vers_4, "4" }, 281 { Opt_vers_4_0, "4.0" }, 282 { Opt_vers_4_1, "4.1" }, 283 284 { Opt_vers_err, NULL } 285 }; 286 287 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, 288 int flags, const char *dev_name, void *raw_data); 289 290 struct file_system_type nfs_fs_type = { 291 .owner = THIS_MODULE, 292 .name = "nfs", 293 .mount = nfs_fs_mount, 294 .kill_sb = nfs_kill_super, 295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 296 }; 297 EXPORT_SYMBOL_GPL(nfs_fs_type); 298 299 struct file_system_type nfs_xdev_fs_type = { 300 .owner = THIS_MODULE, 301 .name = "nfs", 302 .mount = nfs_xdev_mount, 303 .kill_sb = nfs_kill_super, 304 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 305 }; 306 307 const struct super_operations nfs_sops = { 308 .alloc_inode = nfs_alloc_inode, 309 .destroy_inode = nfs_destroy_inode, 310 .write_inode = nfs_write_inode, 311 .drop_inode = nfs_drop_inode, 312 .put_super = nfs_put_super, 313 .statfs = nfs_statfs, 314 .evict_inode = nfs_evict_inode, 315 .umount_begin = nfs_umount_begin, 316 .show_options = nfs_show_options, 317 .show_devname = nfs_show_devname, 318 .show_path = nfs_show_path, 319 .show_stats = nfs_show_stats, 320 .remount_fs = nfs_remount, 321 }; 322 EXPORT_SYMBOL_GPL(nfs_sops); 323 324 #if IS_ENABLED(CONFIG_NFS_V4) 325 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *); 326 static int nfs4_validate_mount_data(void *options, 327 struct nfs_parsed_mount_data *args, const char *dev_name); 328 329 struct file_system_type nfs4_fs_type = { 330 .owner = THIS_MODULE, 331 .name = "nfs4", 332 .mount = nfs_fs_mount, 333 .kill_sb = nfs_kill_super, 334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 335 }; 336 EXPORT_SYMBOL_GPL(nfs4_fs_type); 337 338 static int __init register_nfs4_fs(void) 339 { 340 return register_filesystem(&nfs4_fs_type); 341 } 342 343 static void unregister_nfs4_fs(void) 344 { 345 unregister_filesystem(&nfs4_fs_type); 346 } 347 #else 348 static int __init register_nfs4_fs(void) 349 { 350 return 0; 351 } 352 353 static void unregister_nfs4_fs(void) 354 { 355 } 356 #endif 357 358 static struct shrinker acl_shrinker = { 359 .shrink = nfs_access_cache_shrinker, 360 .seeks = DEFAULT_SEEKS, 361 }; 362 363 /* 364 * Register the NFS filesystems 365 */ 366 int __init register_nfs_fs(void) 367 { 368 int ret; 369 370 ret = register_filesystem(&nfs_fs_type); 371 if (ret < 0) 372 goto error_0; 373 374 ret = register_nfs4_fs(); 375 if (ret < 0) 376 goto error_1; 377 378 ret = nfs_register_sysctl(); 379 if (ret < 0) 380 goto error_2; 381 register_shrinker(&acl_shrinker); 382 return 0; 383 384 error_2: 385 unregister_nfs4_fs(); 386 error_1: 387 unregister_filesystem(&nfs_fs_type); 388 error_0: 389 return ret; 390 } 391 392 /* 393 * Unregister the NFS filesystems 394 */ 395 void __exit unregister_nfs_fs(void) 396 { 397 unregister_shrinker(&acl_shrinker); 398 nfs_unregister_sysctl(); 399 unregister_nfs4_fs(); 400 unregister_filesystem(&nfs_fs_type); 401 } 402 403 void nfs_sb_active(struct super_block *sb) 404 { 405 struct nfs_server *server = NFS_SB(sb); 406 407 if (atomic_inc_return(&server->active) == 1) 408 atomic_inc(&sb->s_active); 409 } 410 EXPORT_SYMBOL_GPL(nfs_sb_active); 411 412 void nfs_sb_deactive(struct super_block *sb) 413 { 414 struct nfs_server *server = NFS_SB(sb); 415 416 if (atomic_dec_and_test(&server->active)) 417 deactivate_super(sb); 418 } 419 EXPORT_SYMBOL_GPL(nfs_sb_deactive); 420 421 static int nfs_deactivate_super_async_work(void *ptr) 422 { 423 struct super_block *sb = ptr; 424 425 deactivate_super(sb); 426 module_put_and_exit(0); 427 return 0; 428 } 429 430 /* 431 * same effect as deactivate_super, but will do final unmount in kthread 432 * context 433 */ 434 static void nfs_deactivate_super_async(struct super_block *sb) 435 { 436 struct task_struct *task; 437 char buf[INET6_ADDRSTRLEN + 1]; 438 struct nfs_server *server = NFS_SB(sb); 439 struct nfs_client *clp = server->nfs_client; 440 441 if (!atomic_add_unless(&sb->s_active, -1, 1)) { 442 rcu_read_lock(); 443 snprintf(buf, sizeof(buf), 444 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 445 rcu_read_unlock(); 446 447 __module_get(THIS_MODULE); 448 task = kthread_run(nfs_deactivate_super_async_work, sb, 449 "%s-deactivate-super", buf); 450 if (IS_ERR(task)) { 451 pr_err("%s: kthread_run: %ld\n", 452 __func__, PTR_ERR(task)); 453 /* make synchronous call and hope for the best */ 454 deactivate_super(sb); 455 module_put(THIS_MODULE); 456 } 457 } 458 } 459 460 void nfs_sb_deactive_async(struct super_block *sb) 461 { 462 struct nfs_server *server = NFS_SB(sb); 463 464 if (atomic_dec_and_test(&server->active)) 465 nfs_deactivate_super_async(sb); 466 } 467 EXPORT_SYMBOL_GPL(nfs_sb_deactive_async); 468 469 /* 470 * Deliver file system statistics to userspace 471 */ 472 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) 473 { 474 struct nfs_server *server = NFS_SB(dentry->d_sb); 475 unsigned char blockbits; 476 unsigned long blockres; 477 struct nfs_fh *fh = NFS_FH(dentry->d_inode); 478 struct nfs_fsstat res; 479 int error = -ENOMEM; 480 481 res.fattr = nfs_alloc_fattr(); 482 if (res.fattr == NULL) 483 goto out_err; 484 485 error = server->nfs_client->rpc_ops->statfs(server, fh, &res); 486 if (unlikely(error == -ESTALE)) { 487 struct dentry *pd_dentry; 488 489 pd_dentry = dget_parent(dentry); 490 if (pd_dentry != NULL) { 491 nfs_zap_caches(pd_dentry->d_inode); 492 dput(pd_dentry); 493 } 494 } 495 nfs_free_fattr(res.fattr); 496 if (error < 0) 497 goto out_err; 498 499 buf->f_type = NFS_SUPER_MAGIC; 500 501 /* 502 * Current versions of glibc do not correctly handle the 503 * case where f_frsize != f_bsize. Eventually we want to 504 * report the value of wtmult in this field. 505 */ 506 buf->f_frsize = dentry->d_sb->s_blocksize; 507 508 /* 509 * On most *nix systems, f_blocks, f_bfree, and f_bavail 510 * are reported in units of f_frsize. Linux hasn't had 511 * an f_frsize field in its statfs struct until recently, 512 * thus historically Linux's sys_statfs reports these 513 * fields in units of f_bsize. 514 */ 515 buf->f_bsize = dentry->d_sb->s_blocksize; 516 blockbits = dentry->d_sb->s_blocksize_bits; 517 blockres = (1 << blockbits) - 1; 518 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 519 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 520 buf->f_bavail = (res.abytes + blockres) >> blockbits; 521 522 buf->f_files = res.tfiles; 523 buf->f_ffree = res.afiles; 524 525 buf->f_namelen = server->namelen; 526 527 return 0; 528 529 out_err: 530 dprintk("%s: statfs error = %d\n", __func__, -error); 531 return error; 532 } 533 EXPORT_SYMBOL_GPL(nfs_statfs); 534 535 /* 536 * Map the security flavour number to a name 537 */ 538 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) 539 { 540 static const struct { 541 rpc_authflavor_t flavour; 542 const char *str; 543 } sec_flavours[] = { 544 { RPC_AUTH_NULL, "null" }, 545 { RPC_AUTH_UNIX, "sys" }, 546 { RPC_AUTH_GSS_KRB5, "krb5" }, 547 { RPC_AUTH_GSS_KRB5I, "krb5i" }, 548 { RPC_AUTH_GSS_KRB5P, "krb5p" }, 549 { RPC_AUTH_GSS_LKEY, "lkey" }, 550 { RPC_AUTH_GSS_LKEYI, "lkeyi" }, 551 { RPC_AUTH_GSS_LKEYP, "lkeyp" }, 552 { RPC_AUTH_GSS_SPKM, "spkm" }, 553 { RPC_AUTH_GSS_SPKMI, "spkmi" }, 554 { RPC_AUTH_GSS_SPKMP, "spkmp" }, 555 { UINT_MAX, "unknown" } 556 }; 557 int i; 558 559 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { 560 if (sec_flavours[i].flavour == flavour) 561 break; 562 } 563 return sec_flavours[i].str; 564 } 565 566 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, 567 int showdefaults) 568 { 569 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; 570 571 seq_printf(m, ",mountproto="); 572 switch (sap->sa_family) { 573 case AF_INET: 574 switch (nfss->mountd_protocol) { 575 case IPPROTO_UDP: 576 seq_printf(m, RPCBIND_NETID_UDP); 577 break; 578 case IPPROTO_TCP: 579 seq_printf(m, RPCBIND_NETID_TCP); 580 break; 581 default: 582 if (showdefaults) 583 seq_printf(m, "auto"); 584 } 585 break; 586 case AF_INET6: 587 switch (nfss->mountd_protocol) { 588 case IPPROTO_UDP: 589 seq_printf(m, RPCBIND_NETID_UDP6); 590 break; 591 case IPPROTO_TCP: 592 seq_printf(m, RPCBIND_NETID_TCP6); 593 break; 594 default: 595 if (showdefaults) 596 seq_printf(m, "auto"); 597 } 598 break; 599 default: 600 if (showdefaults) 601 seq_printf(m, "auto"); 602 } 603 } 604 605 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, 606 int showdefaults) 607 { 608 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; 609 610 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) 611 return; 612 613 switch (sap->sa_family) { 614 case AF_INET: { 615 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 616 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); 617 break; 618 } 619 case AF_INET6: { 620 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 621 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); 622 break; 623 } 624 default: 625 if (showdefaults) 626 seq_printf(m, ",mountaddr=unspecified"); 627 } 628 629 if (nfss->mountd_version || showdefaults) 630 seq_printf(m, ",mountvers=%u", nfss->mountd_version); 631 if ((nfss->mountd_port && 632 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || 633 showdefaults) 634 seq_printf(m, ",mountport=%u", nfss->mountd_port); 635 636 nfs_show_mountd_netid(m, nfss, showdefaults); 637 } 638 639 #if IS_ENABLED(CONFIG_NFS_V4) 640 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 641 int showdefaults) 642 { 643 struct nfs_client *clp = nfss->nfs_client; 644 645 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); 646 } 647 #else 648 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, 649 int showdefaults) 650 { 651 } 652 #endif 653 654 static void nfs_show_nfs_version(struct seq_file *m, 655 unsigned int version, 656 unsigned int minorversion) 657 { 658 seq_printf(m, ",vers=%u", version); 659 if (version == 4) 660 seq_printf(m, ".%u", minorversion); 661 } 662 663 /* 664 * Describe the mount options in force on this server representation 665 */ 666 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, 667 int showdefaults) 668 { 669 static const struct proc_nfs_info { 670 int flag; 671 const char *str; 672 const char *nostr; 673 } nfs_info[] = { 674 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 675 { NFS_MOUNT_POSIX, ",posix", "" }, 676 { NFS_MOUNT_NOCTO, ",nocto", "" }, 677 { NFS_MOUNT_NOAC, ",noac", "" }, 678 { NFS_MOUNT_NONLM, ",nolock", "" }, 679 { NFS_MOUNT_NOACL, ",noacl", "" }, 680 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, 681 { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, 682 { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, 683 { 0, NULL, NULL } 684 }; 685 const struct proc_nfs_info *nfs_infop; 686 struct nfs_client *clp = nfss->nfs_client; 687 u32 version = clp->rpc_ops->version; 688 int local_flock, local_fcntl; 689 690 nfs_show_nfs_version(m, version, clp->cl_minorversion); 691 seq_printf(m, ",rsize=%u", nfss->rsize); 692 seq_printf(m, ",wsize=%u", nfss->wsize); 693 if (nfss->bsize != 0) 694 seq_printf(m, ",bsize=%u", nfss->bsize); 695 seq_printf(m, ",namlen=%u", nfss->namelen); 696 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) 697 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); 698 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) 699 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); 700 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) 701 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); 702 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) 703 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); 704 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 705 if (nfss->flags & nfs_infop->flag) 706 seq_puts(m, nfs_infop->str); 707 else 708 seq_puts(m, nfs_infop->nostr); 709 } 710 rcu_read_lock(); 711 seq_printf(m, ",proto=%s", 712 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); 713 rcu_read_unlock(); 714 if (version == 4) { 715 if (nfss->port != NFS_PORT) 716 seq_printf(m, ",port=%u", nfss->port); 717 } else 718 if (nfss->port) 719 seq_printf(m, ",port=%u", nfss->port); 720 721 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); 722 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); 723 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); 724 725 if (version != 4) 726 nfs_show_mountd_options(m, nfss, showdefaults); 727 else 728 nfs_show_nfsv4_options(m, nfss, showdefaults); 729 730 if (nfss->options & NFS_OPTION_FSCACHE) 731 seq_printf(m, ",fsc"); 732 733 if (nfss->options & NFS_OPTION_MIGRATION) 734 seq_printf(m, ",migration"); 735 736 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { 737 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 738 seq_printf(m, ",lookupcache=none"); 739 else 740 seq_printf(m, ",lookupcache=pos"); 741 } 742 743 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; 744 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; 745 746 if (!local_flock && !local_fcntl) 747 seq_printf(m, ",local_lock=none"); 748 else if (local_flock && local_fcntl) 749 seq_printf(m, ",local_lock=all"); 750 else if (local_flock) 751 seq_printf(m, ",local_lock=flock"); 752 else 753 seq_printf(m, ",local_lock=posix"); 754 } 755 756 /* 757 * Describe the mount options on this VFS mountpoint 758 */ 759 int nfs_show_options(struct seq_file *m, struct dentry *root) 760 { 761 struct nfs_server *nfss = NFS_SB(root->d_sb); 762 763 nfs_show_mount_options(m, nfss, 0); 764 765 rcu_read_lock(); 766 seq_printf(m, ",addr=%s", 767 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, 768 RPC_DISPLAY_ADDR)); 769 rcu_read_unlock(); 770 771 return 0; 772 } 773 EXPORT_SYMBOL_GPL(nfs_show_options); 774 775 #if IS_ENABLED(CONFIG_NFS_V4) 776 #ifdef CONFIG_NFS_V4_1 777 static void show_sessions(struct seq_file *m, struct nfs_server *server) 778 { 779 if (nfs4_has_session(server->nfs_client)) 780 seq_printf(m, ",sessions"); 781 } 782 #else 783 static void show_sessions(struct seq_file *m, struct nfs_server *server) {} 784 #endif 785 #endif 786 787 #ifdef CONFIG_NFS_V4_1 788 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 789 { 790 seq_printf(m, ",pnfs="); 791 if (server->pnfs_curr_ld) 792 seq_printf(m, "%s", server->pnfs_curr_ld->name); 793 else 794 seq_printf(m, "not configured"); 795 } 796 797 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 798 { 799 if (nfss->nfs_client && nfss->nfs_client->cl_implid) { 800 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; 801 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," 802 "date='%llu,%u'", 803 impl_id->name, impl_id->domain, 804 impl_id->date.seconds, impl_id->date.nseconds); 805 } 806 } 807 #else 808 #if IS_ENABLED(CONFIG_NFS_V4) 809 static void show_pnfs(struct seq_file *m, struct nfs_server *server) 810 { 811 } 812 #endif 813 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) 814 { 815 } 816 #endif 817 818 int nfs_show_devname(struct seq_file *m, struct dentry *root) 819 { 820 char *page = (char *) __get_free_page(GFP_KERNEL); 821 char *devname, *dummy; 822 int err = 0; 823 if (!page) 824 return -ENOMEM; 825 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); 826 if (IS_ERR(devname)) 827 err = PTR_ERR(devname); 828 else 829 seq_escape(m, devname, " \t\n\\"); 830 free_page((unsigned long)page); 831 return err; 832 } 833 EXPORT_SYMBOL_GPL(nfs_show_devname); 834 835 int nfs_show_path(struct seq_file *m, struct dentry *dentry) 836 { 837 seq_puts(m, "/"); 838 return 0; 839 } 840 EXPORT_SYMBOL_GPL(nfs_show_path); 841 842 /* 843 * Present statistical information for this VFS mountpoint 844 */ 845 int nfs_show_stats(struct seq_file *m, struct dentry *root) 846 { 847 int i, cpu; 848 struct nfs_server *nfss = NFS_SB(root->d_sb); 849 struct rpc_auth *auth = nfss->client->cl_auth; 850 struct nfs_iostats totals = { }; 851 852 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); 853 854 /* 855 * Display all mount option settings 856 */ 857 seq_printf(m, "\n\topts:\t"); 858 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw"); 859 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); 860 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : ""); 861 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); 862 nfs_show_mount_options(m, nfss, 1); 863 864 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); 865 866 show_implementation_id(m, nfss); 867 868 seq_printf(m, "\n\tcaps:\t"); 869 seq_printf(m, "caps=0x%x", nfss->caps); 870 seq_printf(m, ",wtmult=%u", nfss->wtmult); 871 seq_printf(m, ",dtsize=%u", nfss->dtsize); 872 seq_printf(m, ",bsize=%u", nfss->bsize); 873 seq_printf(m, ",namlen=%u", nfss->namelen); 874 875 #if IS_ENABLED(CONFIG_NFS_V4) 876 if (nfss->nfs_client->rpc_ops->version == 4) { 877 seq_printf(m, "\n\tnfsv4:\t"); 878 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); 879 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); 880 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); 881 show_sessions(m, nfss); 882 show_pnfs(m, nfss); 883 } 884 #endif 885 886 /* 887 * Display security flavor in effect for this mount 888 */ 889 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); 890 if (auth->au_flavor) 891 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); 892 893 /* 894 * Display superblock I/O counters 895 */ 896 for_each_possible_cpu(cpu) { 897 struct nfs_iostats *stats; 898 899 preempt_disable(); 900 stats = per_cpu_ptr(nfss->io_stats, cpu); 901 902 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 903 totals.events[i] += stats->events[i]; 904 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 905 totals.bytes[i] += stats->bytes[i]; 906 #ifdef CONFIG_NFS_FSCACHE 907 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 908 totals.fscache[i] += stats->fscache[i]; 909 #endif 910 911 preempt_enable(); 912 } 913 914 seq_printf(m, "\n\tevents:\t"); 915 for (i = 0; i < __NFSIOS_COUNTSMAX; i++) 916 seq_printf(m, "%lu ", totals.events[i]); 917 seq_printf(m, "\n\tbytes:\t"); 918 for (i = 0; i < __NFSIOS_BYTESMAX; i++) 919 seq_printf(m, "%Lu ", totals.bytes[i]); 920 #ifdef CONFIG_NFS_FSCACHE 921 if (nfss->options & NFS_OPTION_FSCACHE) { 922 seq_printf(m, "\n\tfsc:\t"); 923 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) 924 seq_printf(m, "%Lu ", totals.bytes[i]); 925 } 926 #endif 927 seq_printf(m, "\n"); 928 929 rpc_print_iostats(m, nfss->client); 930 931 return 0; 932 } 933 EXPORT_SYMBOL_GPL(nfs_show_stats); 934 935 /* 936 * Begin unmount by attempting to remove all automounted mountpoints we added 937 * in response to xdev traversals and referrals 938 */ 939 void nfs_umount_begin(struct super_block *sb) 940 { 941 struct nfs_server *server; 942 struct rpc_clnt *rpc; 943 944 server = NFS_SB(sb); 945 /* -EIO all pending I/O */ 946 rpc = server->client_acl; 947 if (!IS_ERR(rpc)) 948 rpc_killall_tasks(rpc); 949 rpc = server->client; 950 if (!IS_ERR(rpc)) 951 rpc_killall_tasks(rpc); 952 } 953 EXPORT_SYMBOL_GPL(nfs_umount_begin); 954 955 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void) 956 { 957 struct nfs_parsed_mount_data *data; 958 959 data = kzalloc(sizeof(*data), GFP_KERNEL); 960 if (data) { 961 data->acregmin = NFS_DEF_ACREGMIN; 962 data->acregmax = NFS_DEF_ACREGMAX; 963 data->acdirmin = NFS_DEF_ACDIRMIN; 964 data->acdirmax = NFS_DEF_ACDIRMAX; 965 data->mount_server.port = NFS_UNSPEC_PORT; 966 data->nfs_server.port = NFS_UNSPEC_PORT; 967 data->nfs_server.protocol = XPRT_TRANSPORT_TCP; 968 data->auth_flavors[0] = RPC_AUTH_UNIX; 969 data->auth_flavor_len = 1; 970 data->minorversion = 0; 971 data->need_mount = true; 972 data->net = current->nsproxy->net_ns; 973 security_init_mnt_opts(&data->lsm_opts); 974 } 975 return data; 976 } 977 978 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data) 979 { 980 if (data) { 981 kfree(data->client_address); 982 kfree(data->mount_server.hostname); 983 kfree(data->nfs_server.export_path); 984 kfree(data->nfs_server.hostname); 985 kfree(data->fscache_uniq); 986 security_free_mnt_opts(&data->lsm_opts); 987 kfree(data); 988 } 989 } 990 991 /* 992 * Sanity-check a server address provided by the mount command. 993 * 994 * Address family must be initialized, and address must not be 995 * the ANY address for that family. 996 */ 997 static int nfs_verify_server_address(struct sockaddr *addr) 998 { 999 switch (addr->sa_family) { 1000 case AF_INET: { 1001 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 1002 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 1003 } 1004 case AF_INET6: { 1005 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 1006 return !ipv6_addr_any(sa); 1007 } 1008 } 1009 1010 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 1011 return 0; 1012 } 1013 1014 /* 1015 * Select between a default port value and a user-specified port value. 1016 * If a zero value is set, then autobind will be used. 1017 */ 1018 static void nfs_set_port(struct sockaddr *sap, int *port, 1019 const unsigned short default_port) 1020 { 1021 if (*port == NFS_UNSPEC_PORT) 1022 *port = default_port; 1023 1024 rpc_set_port(sap, *port); 1025 } 1026 1027 /* 1028 * Sanity check the NFS transport protocol. 1029 * 1030 */ 1031 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt) 1032 { 1033 switch (mnt->nfs_server.protocol) { 1034 case XPRT_TRANSPORT_UDP: 1035 case XPRT_TRANSPORT_TCP: 1036 case XPRT_TRANSPORT_RDMA: 1037 break; 1038 default: 1039 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1040 } 1041 } 1042 1043 /* 1044 * For text based NFSv2/v3 mounts, the mount protocol transport default 1045 * settings should depend upon the specified NFS transport. 1046 */ 1047 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt) 1048 { 1049 nfs_validate_transport_protocol(mnt); 1050 1051 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP || 1052 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP) 1053 return; 1054 switch (mnt->nfs_server.protocol) { 1055 case XPRT_TRANSPORT_UDP: 1056 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1057 break; 1058 case XPRT_TRANSPORT_TCP: 1059 case XPRT_TRANSPORT_RDMA: 1060 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1061 } 1062 } 1063 1064 /* 1065 * Parse the value of the 'sec=' option. 1066 */ 1067 static int nfs_parse_security_flavors(char *value, 1068 struct nfs_parsed_mount_data *mnt) 1069 { 1070 substring_t args[MAX_OPT_ARGS]; 1071 1072 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); 1073 1074 switch (match_token(value, nfs_secflavor_tokens, args)) { 1075 case Opt_sec_none: 1076 mnt->auth_flavors[0] = RPC_AUTH_NULL; 1077 break; 1078 case Opt_sec_sys: 1079 mnt->auth_flavors[0] = RPC_AUTH_UNIX; 1080 break; 1081 case Opt_sec_krb5: 1082 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; 1083 break; 1084 case Opt_sec_krb5i: 1085 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; 1086 break; 1087 case Opt_sec_krb5p: 1088 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; 1089 break; 1090 case Opt_sec_lkey: 1091 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; 1092 break; 1093 case Opt_sec_lkeyi: 1094 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; 1095 break; 1096 case Opt_sec_lkeyp: 1097 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; 1098 break; 1099 case Opt_sec_spkm: 1100 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; 1101 break; 1102 case Opt_sec_spkmi: 1103 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; 1104 break; 1105 case Opt_sec_spkmp: 1106 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; 1107 break; 1108 default: 1109 return 0; 1110 } 1111 1112 mnt->flags |= NFS_MOUNT_SECFLAVOUR; 1113 mnt->auth_flavor_len = 1; 1114 return 1; 1115 } 1116 1117 static int nfs_parse_version_string(char *string, 1118 struct nfs_parsed_mount_data *mnt, 1119 substring_t *args) 1120 { 1121 mnt->flags &= ~NFS_MOUNT_VER3; 1122 switch (match_token(string, nfs_vers_tokens, args)) { 1123 case Opt_vers_2: 1124 mnt->version = 2; 1125 break; 1126 case Opt_vers_3: 1127 mnt->flags |= NFS_MOUNT_VER3; 1128 mnt->version = 3; 1129 break; 1130 case Opt_vers_4: 1131 /* Backward compatibility option. In future, 1132 * the mount program should always supply 1133 * a NFSv4 minor version number. 1134 */ 1135 mnt->version = 4; 1136 break; 1137 case Opt_vers_4_0: 1138 mnt->version = 4; 1139 mnt->minorversion = 0; 1140 break; 1141 case Opt_vers_4_1: 1142 mnt->version = 4; 1143 mnt->minorversion = 1; 1144 break; 1145 default: 1146 return 0; 1147 } 1148 return 1; 1149 } 1150 1151 static int nfs_get_option_str(substring_t args[], char **option) 1152 { 1153 kfree(*option); 1154 *option = match_strdup(args); 1155 return !*option; 1156 } 1157 1158 static int nfs_get_option_ul(substring_t args[], unsigned long *option) 1159 { 1160 int rc; 1161 char *string; 1162 1163 string = match_strdup(args); 1164 if (string == NULL) 1165 return -ENOMEM; 1166 rc = kstrtoul(string, 10, option); 1167 kfree(string); 1168 1169 return rc; 1170 } 1171 1172 /* 1173 * Error-check and convert a string of mount options from user space into 1174 * a data structure. The whole mount string is processed; bad options are 1175 * skipped as they are encountered. If there were no errors, return 1; 1176 * otherwise return 0 (zero). 1177 */ 1178 static int nfs_parse_mount_options(char *raw, 1179 struct nfs_parsed_mount_data *mnt) 1180 { 1181 char *p, *string, *secdata; 1182 int rc, sloppy = 0, invalid_option = 0; 1183 unsigned short protofamily = AF_UNSPEC; 1184 unsigned short mountfamily = AF_UNSPEC; 1185 1186 if (!raw) { 1187 dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); 1188 return 1; 1189 } 1190 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); 1191 1192 secdata = alloc_secdata(); 1193 if (!secdata) 1194 goto out_nomem; 1195 1196 rc = security_sb_copy_data(raw, secdata); 1197 if (rc) 1198 goto out_security_failure; 1199 1200 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts); 1201 if (rc) 1202 goto out_security_failure; 1203 1204 free_secdata(secdata); 1205 1206 while ((p = strsep(&raw, ",")) != NULL) { 1207 substring_t args[MAX_OPT_ARGS]; 1208 unsigned long option; 1209 int token; 1210 1211 if (!*p) 1212 continue; 1213 1214 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); 1215 1216 token = match_token(p, nfs_mount_option_tokens, args); 1217 switch (token) { 1218 1219 /* 1220 * boolean options: foo/nofoo 1221 */ 1222 case Opt_soft: 1223 mnt->flags |= NFS_MOUNT_SOFT; 1224 break; 1225 case Opt_hard: 1226 mnt->flags &= ~NFS_MOUNT_SOFT; 1227 break; 1228 case Opt_posix: 1229 mnt->flags |= NFS_MOUNT_POSIX; 1230 break; 1231 case Opt_noposix: 1232 mnt->flags &= ~NFS_MOUNT_POSIX; 1233 break; 1234 case Opt_cto: 1235 mnt->flags &= ~NFS_MOUNT_NOCTO; 1236 break; 1237 case Opt_nocto: 1238 mnt->flags |= NFS_MOUNT_NOCTO; 1239 break; 1240 case Opt_ac: 1241 mnt->flags &= ~NFS_MOUNT_NOAC; 1242 break; 1243 case Opt_noac: 1244 mnt->flags |= NFS_MOUNT_NOAC; 1245 break; 1246 case Opt_lock: 1247 mnt->flags &= ~NFS_MOUNT_NONLM; 1248 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1249 NFS_MOUNT_LOCAL_FCNTL); 1250 break; 1251 case Opt_nolock: 1252 mnt->flags |= NFS_MOUNT_NONLM; 1253 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1254 NFS_MOUNT_LOCAL_FCNTL); 1255 break; 1256 case Opt_udp: 1257 mnt->flags &= ~NFS_MOUNT_TCP; 1258 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1259 break; 1260 case Opt_tcp: 1261 mnt->flags |= NFS_MOUNT_TCP; 1262 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1263 break; 1264 case Opt_rdma: 1265 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ 1266 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1267 xprt_load_transport(p); 1268 break; 1269 case Opt_acl: 1270 mnt->flags &= ~NFS_MOUNT_NOACL; 1271 break; 1272 case Opt_noacl: 1273 mnt->flags |= NFS_MOUNT_NOACL; 1274 break; 1275 case Opt_rdirplus: 1276 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; 1277 break; 1278 case Opt_nordirplus: 1279 mnt->flags |= NFS_MOUNT_NORDIRPLUS; 1280 break; 1281 case Opt_sharecache: 1282 mnt->flags &= ~NFS_MOUNT_UNSHARED; 1283 break; 1284 case Opt_nosharecache: 1285 mnt->flags |= NFS_MOUNT_UNSHARED; 1286 break; 1287 case Opt_resvport: 1288 mnt->flags &= ~NFS_MOUNT_NORESVPORT; 1289 break; 1290 case Opt_noresvport: 1291 mnt->flags |= NFS_MOUNT_NORESVPORT; 1292 break; 1293 case Opt_fscache: 1294 mnt->options |= NFS_OPTION_FSCACHE; 1295 kfree(mnt->fscache_uniq); 1296 mnt->fscache_uniq = NULL; 1297 break; 1298 case Opt_nofscache: 1299 mnt->options &= ~NFS_OPTION_FSCACHE; 1300 kfree(mnt->fscache_uniq); 1301 mnt->fscache_uniq = NULL; 1302 break; 1303 case Opt_migration: 1304 mnt->options |= NFS_OPTION_MIGRATION; 1305 break; 1306 case Opt_nomigration: 1307 mnt->options &= NFS_OPTION_MIGRATION; 1308 break; 1309 1310 /* 1311 * options that take numeric values 1312 */ 1313 case Opt_port: 1314 if (nfs_get_option_ul(args, &option) || 1315 option > USHRT_MAX) 1316 goto out_invalid_value; 1317 mnt->nfs_server.port = option; 1318 break; 1319 case Opt_rsize: 1320 if (nfs_get_option_ul(args, &option)) 1321 goto out_invalid_value; 1322 mnt->rsize = option; 1323 break; 1324 case Opt_wsize: 1325 if (nfs_get_option_ul(args, &option)) 1326 goto out_invalid_value; 1327 mnt->wsize = option; 1328 break; 1329 case Opt_bsize: 1330 if (nfs_get_option_ul(args, &option)) 1331 goto out_invalid_value; 1332 mnt->bsize = option; 1333 break; 1334 case Opt_timeo: 1335 if (nfs_get_option_ul(args, &option) || option == 0) 1336 goto out_invalid_value; 1337 mnt->timeo = option; 1338 break; 1339 case Opt_retrans: 1340 if (nfs_get_option_ul(args, &option) || option == 0) 1341 goto out_invalid_value; 1342 mnt->retrans = option; 1343 break; 1344 case Opt_acregmin: 1345 if (nfs_get_option_ul(args, &option)) 1346 goto out_invalid_value; 1347 mnt->acregmin = option; 1348 break; 1349 case Opt_acregmax: 1350 if (nfs_get_option_ul(args, &option)) 1351 goto out_invalid_value; 1352 mnt->acregmax = option; 1353 break; 1354 case Opt_acdirmin: 1355 if (nfs_get_option_ul(args, &option)) 1356 goto out_invalid_value; 1357 mnt->acdirmin = option; 1358 break; 1359 case Opt_acdirmax: 1360 if (nfs_get_option_ul(args, &option)) 1361 goto out_invalid_value; 1362 mnt->acdirmax = option; 1363 break; 1364 case Opt_actimeo: 1365 if (nfs_get_option_ul(args, &option)) 1366 goto out_invalid_value; 1367 mnt->acregmin = mnt->acregmax = 1368 mnt->acdirmin = mnt->acdirmax = option; 1369 break; 1370 case Opt_namelen: 1371 if (nfs_get_option_ul(args, &option)) 1372 goto out_invalid_value; 1373 mnt->namlen = option; 1374 break; 1375 case Opt_mountport: 1376 if (nfs_get_option_ul(args, &option) || 1377 option > USHRT_MAX) 1378 goto out_invalid_value; 1379 mnt->mount_server.port = option; 1380 break; 1381 case Opt_mountvers: 1382 if (nfs_get_option_ul(args, &option) || 1383 option < NFS_MNT_VERSION || 1384 option > NFS_MNT3_VERSION) 1385 goto out_invalid_value; 1386 mnt->mount_server.version = option; 1387 break; 1388 case Opt_minorversion: 1389 if (nfs_get_option_ul(args, &option)) 1390 goto out_invalid_value; 1391 if (option > NFS4_MAX_MINOR_VERSION) 1392 goto out_invalid_value; 1393 mnt->minorversion = option; 1394 break; 1395 1396 /* 1397 * options that take text values 1398 */ 1399 case Opt_nfsvers: 1400 string = match_strdup(args); 1401 if (string == NULL) 1402 goto out_nomem; 1403 rc = nfs_parse_version_string(string, mnt, args); 1404 kfree(string); 1405 if (!rc) 1406 goto out_invalid_value; 1407 break; 1408 case Opt_sec: 1409 string = match_strdup(args); 1410 if (string == NULL) 1411 goto out_nomem; 1412 rc = nfs_parse_security_flavors(string, mnt); 1413 kfree(string); 1414 if (!rc) { 1415 dfprintk(MOUNT, "NFS: unrecognized " 1416 "security flavor\n"); 1417 return 0; 1418 } 1419 break; 1420 case Opt_proto: 1421 string = match_strdup(args); 1422 if (string == NULL) 1423 goto out_nomem; 1424 token = match_token(string, 1425 nfs_xprt_protocol_tokens, args); 1426 1427 protofamily = AF_INET; 1428 switch (token) { 1429 case Opt_xprt_udp6: 1430 protofamily = AF_INET6; 1431 case Opt_xprt_udp: 1432 mnt->flags &= ~NFS_MOUNT_TCP; 1433 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1434 break; 1435 case Opt_xprt_tcp6: 1436 protofamily = AF_INET6; 1437 case Opt_xprt_tcp: 1438 mnt->flags |= NFS_MOUNT_TCP; 1439 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1440 break; 1441 case Opt_xprt_rdma: 1442 /* vector side protocols to TCP */ 1443 mnt->flags |= NFS_MOUNT_TCP; 1444 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; 1445 xprt_load_transport(string); 1446 break; 1447 default: 1448 dfprintk(MOUNT, "NFS: unrecognized " 1449 "transport protocol\n"); 1450 kfree(string); 1451 return 0; 1452 } 1453 kfree(string); 1454 break; 1455 case Opt_mountproto: 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 kfree(string); 1462 1463 mountfamily = AF_INET; 1464 switch (token) { 1465 case Opt_xprt_udp6: 1466 mountfamily = AF_INET6; 1467 case Opt_xprt_udp: 1468 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; 1469 break; 1470 case Opt_xprt_tcp6: 1471 mountfamily = AF_INET6; 1472 case Opt_xprt_tcp: 1473 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; 1474 break; 1475 case Opt_xprt_rdma: /* not used for side protocols */ 1476 default: 1477 dfprintk(MOUNT, "NFS: unrecognized " 1478 "transport protocol\n"); 1479 return 0; 1480 } 1481 break; 1482 case Opt_addr: 1483 string = match_strdup(args); 1484 if (string == NULL) 1485 goto out_nomem; 1486 mnt->nfs_server.addrlen = 1487 rpc_pton(mnt->net, string, strlen(string), 1488 (struct sockaddr *) 1489 &mnt->nfs_server.address, 1490 sizeof(mnt->nfs_server.address)); 1491 kfree(string); 1492 if (mnt->nfs_server.addrlen == 0) 1493 goto out_invalid_address; 1494 break; 1495 case Opt_clientaddr: 1496 if (nfs_get_option_str(args, &mnt->client_address)) 1497 goto out_nomem; 1498 break; 1499 case Opt_mounthost: 1500 if (nfs_get_option_str(args, 1501 &mnt->mount_server.hostname)) 1502 goto out_nomem; 1503 break; 1504 case Opt_mountaddr: 1505 string = match_strdup(args); 1506 if (string == NULL) 1507 goto out_nomem; 1508 mnt->mount_server.addrlen = 1509 rpc_pton(mnt->net, string, strlen(string), 1510 (struct sockaddr *) 1511 &mnt->mount_server.address, 1512 sizeof(mnt->mount_server.address)); 1513 kfree(string); 1514 if (mnt->mount_server.addrlen == 0) 1515 goto out_invalid_address; 1516 break; 1517 case Opt_lookupcache: 1518 string = match_strdup(args); 1519 if (string == NULL) 1520 goto out_nomem; 1521 token = match_token(string, 1522 nfs_lookupcache_tokens, args); 1523 kfree(string); 1524 switch (token) { 1525 case Opt_lookupcache_all: 1526 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 1527 break; 1528 case Opt_lookupcache_positive: 1529 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 1530 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 1531 break; 1532 case Opt_lookupcache_none: 1533 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 1534 break; 1535 default: 1536 dfprintk(MOUNT, "NFS: invalid " 1537 "lookupcache argument\n"); 1538 return 0; 1539 }; 1540 break; 1541 case Opt_fscache_uniq: 1542 if (nfs_get_option_str(args, &mnt->fscache_uniq)) 1543 goto out_nomem; 1544 mnt->options |= NFS_OPTION_FSCACHE; 1545 break; 1546 case Opt_local_lock: 1547 string = match_strdup(args); 1548 if (string == NULL) 1549 goto out_nomem; 1550 token = match_token(string, nfs_local_lock_tokens, 1551 args); 1552 kfree(string); 1553 switch (token) { 1554 case Opt_local_lock_all: 1555 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK | 1556 NFS_MOUNT_LOCAL_FCNTL); 1557 break; 1558 case Opt_local_lock_flock: 1559 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK; 1560 break; 1561 case Opt_local_lock_posix: 1562 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL; 1563 break; 1564 case Opt_local_lock_none: 1565 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 1566 NFS_MOUNT_LOCAL_FCNTL); 1567 break; 1568 default: 1569 dfprintk(MOUNT, "NFS: invalid " 1570 "local_lock argument\n"); 1571 return 0; 1572 }; 1573 break; 1574 1575 /* 1576 * Special options 1577 */ 1578 case Opt_sloppy: 1579 sloppy = 1; 1580 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 1581 break; 1582 case Opt_userspace: 1583 case Opt_deprecated: 1584 dfprintk(MOUNT, "NFS: ignoring mount option " 1585 "'%s'\n", p); 1586 break; 1587 1588 default: 1589 invalid_option = 1; 1590 dfprintk(MOUNT, "NFS: unrecognized mount option " 1591 "'%s'\n", p); 1592 } 1593 } 1594 1595 if (!sloppy && invalid_option) 1596 return 0; 1597 1598 if (mnt->minorversion && mnt->version != 4) 1599 goto out_minorversion_mismatch; 1600 1601 if (mnt->options & NFS_OPTION_MIGRATION && 1602 mnt->version != 4 && mnt->minorversion != 0) 1603 goto out_migration_misuse; 1604 1605 /* 1606 * verify that any proto=/mountproto= options match the address 1607 * families in the addr=/mountaddr= options. 1608 */ 1609 if (protofamily != AF_UNSPEC && 1610 protofamily != mnt->nfs_server.address.ss_family) 1611 goto out_proto_mismatch; 1612 1613 if (mountfamily != AF_UNSPEC) { 1614 if (mnt->mount_server.addrlen) { 1615 if (mountfamily != mnt->mount_server.address.ss_family) 1616 goto out_mountproto_mismatch; 1617 } else { 1618 if (mountfamily != mnt->nfs_server.address.ss_family) 1619 goto out_mountproto_mismatch; 1620 } 1621 } 1622 1623 return 1; 1624 1625 out_mountproto_mismatch: 1626 printk(KERN_INFO "NFS: mount server address does not match mountproto= " 1627 "option\n"); 1628 return 0; 1629 out_proto_mismatch: 1630 printk(KERN_INFO "NFS: server address does not match proto= option\n"); 1631 return 0; 1632 out_invalid_address: 1633 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p); 1634 return 0; 1635 out_invalid_value: 1636 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p); 1637 return 0; 1638 out_minorversion_mismatch: 1639 printk(KERN_INFO "NFS: mount option vers=%u does not support " 1640 "minorversion=%u\n", mnt->version, mnt->minorversion); 1641 return 0; 1642 out_migration_misuse: 1643 printk(KERN_INFO 1644 "NFS: 'migration' not supported for this NFS version\n"); 1645 return 0; 1646 out_nomem: 1647 printk(KERN_INFO "NFS: not enough memory to parse option\n"); 1648 return 0; 1649 out_security_failure: 1650 free_secdata(secdata); 1651 printk(KERN_INFO "NFS: security options invalid: %d\n", rc); 1652 return 0; 1653 } 1654 1655 /* 1656 * Match the requested auth flavors with the list returned by 1657 * the server. Returns zero and sets the mount's authentication 1658 * flavor on success; returns -EACCES if server does not support 1659 * the requested flavor. 1660 */ 1661 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args, 1662 struct nfs_mount_request *request) 1663 { 1664 unsigned int i, j, server_authlist_len = *(request->auth_flav_len); 1665 1666 /* 1667 * Certain releases of Linux's mountd return an empty 1668 * flavor list. To prevent behavioral regression with 1669 * these servers (ie. rejecting mounts that used to 1670 * succeed), revert to pre-2.6.32 behavior (no checking) 1671 * if the returned flavor list is empty. 1672 */ 1673 if (server_authlist_len == 0) 1674 return 0; 1675 1676 /* 1677 * We avoid sophisticated negotiating here, as there are 1678 * plenty of cases where we can get it wrong, providing 1679 * either too little or too much security. 1680 * 1681 * RFC 2623, section 2.7 suggests we SHOULD prefer the 1682 * flavor listed first. However, some servers list 1683 * AUTH_NULL first. Our caller plants AUTH_SYS, the 1684 * preferred default, in args->auth_flavors[0] if user 1685 * didn't specify sec= mount option. 1686 */ 1687 for (i = 0; i < args->auth_flavor_len; i++) 1688 for (j = 0; j < server_authlist_len; j++) 1689 if (args->auth_flavors[i] == request->auth_flavs[j]) { 1690 dfprintk(MOUNT, "NFS: using auth flavor %d\n", 1691 request->auth_flavs[j]); 1692 args->auth_flavors[0] = request->auth_flavs[j]; 1693 return 0; 1694 } 1695 1696 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n"); 1697 nfs_umount(request); 1698 return -EACCES; 1699 } 1700 1701 /* 1702 * Use the remote server's MOUNT service to request the NFS file handle 1703 * corresponding to the provided path. 1704 */ 1705 static int nfs_request_mount(struct nfs_parsed_mount_data *args, 1706 struct nfs_fh *root_fh) 1707 { 1708 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS]; 1709 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist); 1710 struct nfs_mount_request request = { 1711 .sap = (struct sockaddr *) 1712 &args->mount_server.address, 1713 .dirpath = args->nfs_server.export_path, 1714 .protocol = args->mount_server.protocol, 1715 .fh = root_fh, 1716 .noresvport = args->flags & NFS_MOUNT_NORESVPORT, 1717 .auth_flav_len = &server_authlist_len, 1718 .auth_flavs = server_authlist, 1719 .net = args->net, 1720 }; 1721 int status; 1722 1723 if (args->mount_server.version == 0) { 1724 switch (args->version) { 1725 default: 1726 args->mount_server.version = NFS_MNT3_VERSION; 1727 break; 1728 case 2: 1729 args->mount_server.version = NFS_MNT_VERSION; 1730 } 1731 } 1732 request.version = args->mount_server.version; 1733 1734 if (args->mount_server.hostname) 1735 request.hostname = args->mount_server.hostname; 1736 else 1737 request.hostname = args->nfs_server.hostname; 1738 1739 /* 1740 * Construct the mount server's address. 1741 */ 1742 if (args->mount_server.address.ss_family == AF_UNSPEC) { 1743 memcpy(request.sap, &args->nfs_server.address, 1744 args->nfs_server.addrlen); 1745 args->mount_server.addrlen = args->nfs_server.addrlen; 1746 } 1747 request.salen = args->mount_server.addrlen; 1748 nfs_set_port(request.sap, &args->mount_server.port, 0); 1749 1750 /* 1751 * Now ask the mount server to map our export path 1752 * to a file handle. 1753 */ 1754 status = nfs_mount(&request); 1755 if (status != 0) { 1756 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", 1757 request.hostname, status); 1758 return status; 1759 } 1760 1761 /* 1762 * MNTv1 (NFSv2) does not support auth flavor negotiation. 1763 */ 1764 if (args->mount_server.version != NFS_MNT3_VERSION) 1765 return 0; 1766 return nfs_walk_authlist(args, &request); 1767 } 1768 1769 struct dentry *nfs_try_mount(int flags, const char *dev_name, 1770 struct nfs_mount_info *mount_info, 1771 struct nfs_subversion *nfs_mod) 1772 { 1773 int status; 1774 struct nfs_server *server; 1775 1776 if (mount_info->parsed->need_mount) { 1777 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh); 1778 if (status) 1779 return ERR_PTR(status); 1780 } 1781 1782 /* Get a volume representation */ 1783 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod); 1784 if (IS_ERR(server)) 1785 return ERR_CAST(server); 1786 1787 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod); 1788 } 1789 EXPORT_SYMBOL_GPL(nfs_try_mount); 1790 1791 /* 1792 * Split "dev_name" into "hostname:export_path". 1793 * 1794 * The leftmost colon demarks the split between the server's hostname 1795 * and the export path. If the hostname starts with a left square 1796 * bracket, then it may contain colons. 1797 * 1798 * Note: caller frees hostname and export path, even on error. 1799 */ 1800 static int nfs_parse_devname(const char *dev_name, 1801 char **hostname, size_t maxnamlen, 1802 char **export_path, size_t maxpathlen) 1803 { 1804 size_t len; 1805 char *end; 1806 1807 /* Is the host name protected with square brakcets? */ 1808 if (*dev_name == '[') { 1809 end = strchr(++dev_name, ']'); 1810 if (end == NULL || end[1] != ':') 1811 goto out_bad_devname; 1812 1813 len = end - dev_name; 1814 end++; 1815 } else { 1816 char *comma; 1817 1818 end = strchr(dev_name, ':'); 1819 if (end == NULL) 1820 goto out_bad_devname; 1821 len = end - dev_name; 1822 1823 /* kill possible hostname list: not supported */ 1824 comma = strchr(dev_name, ','); 1825 if (comma != NULL && comma < end) 1826 *comma = 0; 1827 } 1828 1829 if (len > maxnamlen) 1830 goto out_hostname; 1831 1832 /* N.B. caller will free nfs_server.hostname in all cases */ 1833 *hostname = kstrndup(dev_name, len, GFP_KERNEL); 1834 if (*hostname == NULL) 1835 goto out_nomem; 1836 len = strlen(++end); 1837 if (len > maxpathlen) 1838 goto out_path; 1839 *export_path = kstrndup(end, len, GFP_KERNEL); 1840 if (!*export_path) 1841 goto out_nomem; 1842 1843 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); 1844 return 0; 1845 1846 out_bad_devname: 1847 dfprintk(MOUNT, "NFS: device name not in host:path format\n"); 1848 return -EINVAL; 1849 1850 out_nomem: 1851 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n"); 1852 return -ENOMEM; 1853 1854 out_hostname: 1855 dfprintk(MOUNT, "NFS: server hostname too long\n"); 1856 return -ENAMETOOLONG; 1857 1858 out_path: 1859 dfprintk(MOUNT, "NFS: export pathname too long\n"); 1860 return -ENAMETOOLONG; 1861 } 1862 1863 /* 1864 * Validate the NFS2/NFS3 mount data 1865 * - fills in the mount root filehandle 1866 * 1867 * For option strings, user space handles the following behaviors: 1868 * 1869 * + DNS: mapping server host name to IP address ("addr=" option) 1870 * 1871 * + failure mode: how to behave if a mount request can't be handled 1872 * immediately ("fg/bg" option) 1873 * 1874 * + retry: how often to retry a mount request ("retry=" option) 1875 * 1876 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 1877 * mountproto=tcp after mountproto=udp, and so on 1878 */ 1879 static int nfs23_validate_mount_data(void *options, 1880 struct nfs_parsed_mount_data *args, 1881 struct nfs_fh *mntfh, 1882 const char *dev_name) 1883 { 1884 struct nfs_mount_data *data = (struct nfs_mount_data *)options; 1885 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 1886 1887 if (data == NULL) 1888 goto out_no_data; 1889 1890 args->version = NFS_DEFAULT_VERSION; 1891 switch (data->version) { 1892 case 1: 1893 data->namlen = 0; 1894 case 2: 1895 data->bsize = 0; 1896 case 3: 1897 if (data->flags & NFS_MOUNT_VER3) 1898 goto out_no_v3; 1899 data->root.size = NFS2_FHSIZE; 1900 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1901 case 4: 1902 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1903 goto out_no_sec; 1904 case 5: 1905 memset(data->context, 0, sizeof(data->context)); 1906 case 6: 1907 if (data->flags & NFS_MOUNT_VER3) { 1908 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 1909 goto out_invalid_fh; 1910 mntfh->size = data->root.size; 1911 args->version = 3; 1912 } else { 1913 mntfh->size = NFS2_FHSIZE; 1914 args->version = 2; 1915 } 1916 1917 1918 memcpy(mntfh->data, data->root.data, mntfh->size); 1919 if (mntfh->size < sizeof(mntfh->data)) 1920 memset(mntfh->data + mntfh->size, 0, 1921 sizeof(mntfh->data) - mntfh->size); 1922 1923 /* 1924 * Translate to nfs_parsed_mount_data, which nfs_fill_super 1925 * can deal with. 1926 */ 1927 args->flags = data->flags & NFS_MOUNT_FLAGMASK; 1928 args->flags |= NFS_MOUNT_LEGACY_INTERFACE; 1929 args->rsize = data->rsize; 1930 args->wsize = data->wsize; 1931 args->timeo = data->timeo; 1932 args->retrans = data->retrans; 1933 args->acregmin = data->acregmin; 1934 args->acregmax = data->acregmax; 1935 args->acdirmin = data->acdirmin; 1936 args->acdirmax = data->acdirmax; 1937 args->need_mount = false; 1938 1939 memcpy(sap, &data->addr, sizeof(data->addr)); 1940 args->nfs_server.addrlen = sizeof(data->addr); 1941 args->nfs_server.port = ntohs(data->addr.sin_port); 1942 if (!nfs_verify_server_address(sap)) 1943 goto out_no_address; 1944 1945 if (!(data->flags & NFS_MOUNT_TCP)) 1946 args->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1947 /* N.B. caller will free nfs_server.hostname in all cases */ 1948 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1949 args->namlen = data->namlen; 1950 args->bsize = data->bsize; 1951 1952 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1953 args->auth_flavors[0] = data->pseudoflavor; 1954 if (!args->nfs_server.hostname) 1955 goto out_nomem; 1956 1957 if (!(data->flags & NFS_MOUNT_NONLM)) 1958 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1959 NFS_MOUNT_LOCAL_FCNTL); 1960 else 1961 args->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1962 NFS_MOUNT_LOCAL_FCNTL); 1963 /* 1964 * The legacy version 6 binary mount data from userspace has a 1965 * field used only to transport selinux information into the 1966 * the kernel. To continue to support that functionality we 1967 * have a touch of selinux knowledge here in the NFS code. The 1968 * userspace code converted context=blah to just blah so we are 1969 * converting back to the full string selinux understands. 1970 */ 1971 if (data->context[0]){ 1972 #ifdef CONFIG_SECURITY_SELINUX 1973 int rc; 1974 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL); 1975 if (!opts_str) 1976 return -ENOMEM; 1977 strcpy(opts_str, "context="); 1978 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1979 strcat(opts_str, &data->context[0]); 1980 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts); 1981 kfree(opts_str); 1982 if (rc) 1983 return rc; 1984 #else 1985 return -EINVAL; 1986 #endif 1987 } 1988 1989 break; 1990 default: 1991 return NFS_TEXT_DATA; 1992 } 1993 1994 #if !IS_ENABLED(CONFIG_NFS_V3) 1995 if (args->version == 3) 1996 goto out_v3_not_compiled; 1997 #endif /* !CONFIG_NFS_V3 */ 1998 1999 return 0; 2000 2001 out_no_data: 2002 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); 2003 return -EINVAL; 2004 2005 out_no_v3: 2006 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", 2007 data->version); 2008 return -EINVAL; 2009 2010 out_no_sec: 2011 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); 2012 return -EINVAL; 2013 2014 #if !IS_ENABLED(CONFIG_NFS_V3) 2015 out_v3_not_compiled: 2016 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); 2017 return -EPROTONOSUPPORT; 2018 #endif /* !CONFIG_NFS_V3 */ 2019 2020 out_nomem: 2021 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n"); 2022 return -ENOMEM; 2023 2024 out_no_address: 2025 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2026 return -EINVAL; 2027 2028 out_invalid_fh: 2029 dfprintk(MOUNT, "NFS: invalid root filehandle\n"); 2030 return -EINVAL; 2031 } 2032 2033 #if IS_ENABLED(CONFIG_NFS_V4) 2034 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2035 void *options, 2036 struct nfs_parsed_mount_data *args, 2037 struct nfs_fh *mntfh, 2038 const char *dev_name) 2039 { 2040 if (fs_type == &nfs_fs_type) 2041 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2042 return nfs4_validate_mount_data(options, args, dev_name); 2043 } 2044 #else 2045 static int nfs_validate_mount_data(struct file_system_type *fs_type, 2046 void *options, 2047 struct nfs_parsed_mount_data *args, 2048 struct nfs_fh *mntfh, 2049 const char *dev_name) 2050 { 2051 return nfs23_validate_mount_data(options, args, mntfh, dev_name); 2052 } 2053 #endif 2054 2055 static int nfs_validate_text_mount_data(void *options, 2056 struct nfs_parsed_mount_data *args, 2057 const char *dev_name) 2058 { 2059 int port = 0; 2060 int max_namelen = PAGE_SIZE; 2061 int max_pathlen = NFS_MAXPATHLEN; 2062 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2063 2064 if (nfs_parse_mount_options((char *)options, args) == 0) 2065 return -EINVAL; 2066 2067 if (!nfs_verify_server_address(sap)) 2068 goto out_no_address; 2069 2070 if (args->version == 4) { 2071 #if IS_ENABLED(CONFIG_NFS_V4) 2072 port = NFS_PORT; 2073 max_namelen = NFS4_MAXNAMLEN; 2074 max_pathlen = NFS4_MAXPATHLEN; 2075 nfs_validate_transport_protocol(args); 2076 nfs4_validate_mount_flags(args); 2077 #else 2078 goto out_v4_not_compiled; 2079 #endif /* CONFIG_NFS_V4 */ 2080 } else 2081 nfs_set_mount_transport_protocol(args); 2082 2083 nfs_set_port(sap, &args->nfs_server.port, port); 2084 2085 if (args->auth_flavor_len > 1) 2086 goto out_bad_auth; 2087 2088 return nfs_parse_devname(dev_name, 2089 &args->nfs_server.hostname, 2090 max_namelen, 2091 &args->nfs_server.export_path, 2092 max_pathlen); 2093 2094 #if !IS_ENABLED(CONFIG_NFS_V4) 2095 out_v4_not_compiled: 2096 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n"); 2097 return -EPROTONOSUPPORT; 2098 #endif /* !CONFIG_NFS_V4 */ 2099 2100 out_no_address: 2101 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); 2102 return -EINVAL; 2103 2104 out_bad_auth: 2105 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n"); 2106 return -EINVAL; 2107 } 2108 2109 static int 2110 nfs_compare_remount_data(struct nfs_server *nfss, 2111 struct nfs_parsed_mount_data *data) 2112 { 2113 if (data->flags != nfss->flags || 2114 data->rsize != nfss->rsize || 2115 data->wsize != nfss->wsize || 2116 data->retrans != nfss->client->cl_timeout->to_retries || 2117 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor || 2118 data->acregmin != nfss->acregmin / HZ || 2119 data->acregmax != nfss->acregmax / HZ || 2120 data->acdirmin != nfss->acdirmin / HZ || 2121 data->acdirmax != nfss->acdirmax / HZ || 2122 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || 2123 data->nfs_server.port != nfss->port || 2124 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || 2125 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address, 2126 (struct sockaddr *)&nfss->nfs_client->cl_addr)) 2127 return -EINVAL; 2128 2129 return 0; 2130 } 2131 2132 int 2133 nfs_remount(struct super_block *sb, int *flags, char *raw_data) 2134 { 2135 int error; 2136 struct nfs_server *nfss = sb->s_fs_info; 2137 struct nfs_parsed_mount_data *data; 2138 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data; 2139 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data; 2140 u32 nfsvers = nfss->nfs_client->rpc_ops->version; 2141 2142 /* 2143 * Userspace mount programs that send binary options generally send 2144 * them populated with default values. We have no way to know which 2145 * ones were explicitly specified. Fall back to legacy behavior and 2146 * just return success. 2147 */ 2148 if ((nfsvers == 4 && (!options4 || options4->version == 1)) || 2149 (nfsvers <= 3 && (!options || (options->version >= 1 && 2150 options->version <= 6)))) 2151 return 0; 2152 2153 data = kzalloc(sizeof(*data), GFP_KERNEL); 2154 if (data == NULL) 2155 return -ENOMEM; 2156 2157 /* fill out struct with values from existing mount */ 2158 data->flags = nfss->flags; 2159 data->rsize = nfss->rsize; 2160 data->wsize = nfss->wsize; 2161 data->retrans = nfss->client->cl_timeout->to_retries; 2162 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor; 2163 data->acregmin = nfss->acregmin / HZ; 2164 data->acregmax = nfss->acregmax / HZ; 2165 data->acdirmin = nfss->acdirmin / HZ; 2166 data->acdirmax = nfss->acdirmax / HZ; 2167 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 2168 data->nfs_server.port = nfss->port; 2169 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 2170 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr, 2171 data->nfs_server.addrlen); 2172 2173 /* overwrite those values with any that were specified */ 2174 error = nfs_parse_mount_options((char *)options, data); 2175 if (error < 0) 2176 goto out; 2177 2178 /* 2179 * noac is a special case. It implies -o sync, but that's not 2180 * necessarily reflected in the mtab options. do_remount_sb 2181 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the 2182 * remount options, so we have to explicitly reset it. 2183 */ 2184 if (data->flags & NFS_MOUNT_NOAC) 2185 *flags |= MS_SYNCHRONOUS; 2186 2187 /* compare new mount options with old ones */ 2188 error = nfs_compare_remount_data(nfss, data); 2189 out: 2190 kfree(data); 2191 return error; 2192 } 2193 EXPORT_SYMBOL_GPL(nfs_remount); 2194 2195 /* 2196 * Initialise the common bits of the superblock 2197 */ 2198 inline void nfs_initialise_sb(struct super_block *sb) 2199 { 2200 struct nfs_server *server = NFS_SB(sb); 2201 2202 sb->s_magic = NFS_SUPER_MAGIC; 2203 2204 /* We probably want something more informative here */ 2205 snprintf(sb->s_id, sizeof(sb->s_id), 2206 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 2207 2208 if (sb->s_blocksize == 0) 2209 sb->s_blocksize = nfs_block_bits(server->wsize, 2210 &sb->s_blocksize_bits); 2211 2212 sb->s_bdi = &server->backing_dev_info; 2213 2214 nfs_super_set_maxbytes(sb, server->maxfilesize); 2215 } 2216 2217 /* 2218 * Finish setting up an NFS2/3 superblock 2219 */ 2220 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2221 { 2222 struct nfs_parsed_mount_data *data = mount_info->parsed; 2223 struct nfs_server *server = NFS_SB(sb); 2224 2225 sb->s_blocksize_bits = 0; 2226 sb->s_blocksize = 0; 2227 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; 2228 sb->s_op = server->nfs_client->cl_nfs_mod->sops; 2229 if (data && data->bsize) 2230 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 2231 2232 if (server->nfs_client->rpc_ops->version != 2) { 2233 /* The VFS shouldn't apply the umask to mode bits. We will do 2234 * so ourselves when necessary. 2235 */ 2236 sb->s_flags |= MS_POSIXACL; 2237 sb->s_time_gran = 1; 2238 } 2239 2240 nfs_initialise_sb(sb); 2241 } 2242 EXPORT_SYMBOL_GPL(nfs_fill_super); 2243 2244 /* 2245 * Finish setting up a cloned NFS2/3/4 superblock 2246 */ 2247 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info) 2248 { 2249 const struct super_block *old_sb = mount_info->cloned->sb; 2250 struct nfs_server *server = NFS_SB(sb); 2251 2252 sb->s_blocksize_bits = old_sb->s_blocksize_bits; 2253 sb->s_blocksize = old_sb->s_blocksize; 2254 sb->s_maxbytes = old_sb->s_maxbytes; 2255 sb->s_xattr = old_sb->s_xattr; 2256 sb->s_op = old_sb->s_op; 2257 sb->s_time_gran = 1; 2258 2259 if (server->nfs_client->rpc_ops->version != 2) { 2260 /* The VFS shouldn't apply the umask to mode bits. We will do 2261 * so ourselves when necessary. 2262 */ 2263 sb->s_flags |= MS_POSIXACL; 2264 } 2265 2266 nfs_initialise_sb(sb); 2267 } 2268 2269 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) 2270 { 2271 const struct nfs_server *a = s->s_fs_info; 2272 const struct rpc_clnt *clnt_a = a->client; 2273 const struct rpc_clnt *clnt_b = b->client; 2274 2275 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) 2276 goto Ebusy; 2277 if (a->nfs_client != b->nfs_client) 2278 goto Ebusy; 2279 if (a->flags != b->flags) 2280 goto Ebusy; 2281 if (a->wsize != b->wsize) 2282 goto Ebusy; 2283 if (a->rsize != b->rsize) 2284 goto Ebusy; 2285 if (a->acregmin != b->acregmin) 2286 goto Ebusy; 2287 if (a->acregmax != b->acregmax) 2288 goto Ebusy; 2289 if (a->acdirmin != b->acdirmin) 2290 goto Ebusy; 2291 if (a->acdirmax != b->acdirmax) 2292 goto Ebusy; 2293 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) 2294 goto Ebusy; 2295 return 1; 2296 Ebusy: 2297 return 0; 2298 } 2299 2300 struct nfs_sb_mountdata { 2301 struct nfs_server *server; 2302 int mntflags; 2303 }; 2304 2305 static int nfs_set_super(struct super_block *s, void *data) 2306 { 2307 struct nfs_sb_mountdata *sb_mntdata = data; 2308 struct nfs_server *server = sb_mntdata->server; 2309 int ret; 2310 2311 s->s_flags = sb_mntdata->mntflags; 2312 s->s_fs_info = server; 2313 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; 2314 ret = set_anon_super(s, server); 2315 if (ret == 0) 2316 server->s_dev = s->s_dev; 2317 return ret; 2318 } 2319 2320 static int nfs_compare_super_address(struct nfs_server *server1, 2321 struct nfs_server *server2) 2322 { 2323 struct sockaddr *sap1, *sap2; 2324 2325 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; 2326 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; 2327 2328 if (sap1->sa_family != sap2->sa_family) 2329 return 0; 2330 2331 switch (sap1->sa_family) { 2332 case AF_INET: { 2333 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; 2334 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; 2335 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) 2336 return 0; 2337 if (sin1->sin_port != sin2->sin_port) 2338 return 0; 2339 break; 2340 } 2341 case AF_INET6: { 2342 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; 2343 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; 2344 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 2345 return 0; 2346 if (sin1->sin6_port != sin2->sin6_port) 2347 return 0; 2348 break; 2349 } 2350 default: 2351 return 0; 2352 } 2353 2354 return 1; 2355 } 2356 2357 static int nfs_compare_super(struct super_block *sb, void *data) 2358 { 2359 struct nfs_sb_mountdata *sb_mntdata = data; 2360 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); 2361 int mntflags = sb_mntdata->mntflags; 2362 2363 if (!nfs_compare_super_address(old, server)) 2364 return 0; 2365 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ 2366 if (old->flags & NFS_MOUNT_UNSHARED) 2367 return 0; 2368 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) 2369 return 0; 2370 return nfs_compare_mount_options(sb, server, mntflags); 2371 } 2372 2373 #ifdef CONFIG_NFS_FSCACHE 2374 static void nfs_get_cache_cookie(struct super_block *sb, 2375 struct nfs_parsed_mount_data *parsed, 2376 struct nfs_clone_mount *cloned) 2377 { 2378 struct nfs_server *nfss = NFS_SB(sb); 2379 char *uniq = NULL; 2380 int ulen = 0; 2381 2382 nfss->fscache_key = NULL; 2383 nfss->fscache = NULL; 2384 2385 if (parsed) { 2386 if (!(parsed->options & NFS_OPTION_FSCACHE)) 2387 return; 2388 if (parsed->fscache_uniq) { 2389 uniq = parsed->fscache_uniq; 2390 ulen = strlen(parsed->fscache_uniq); 2391 } 2392 } else if (cloned) { 2393 struct nfs_server *mnt_s = NFS_SB(cloned->sb); 2394 if (!(mnt_s->options & NFS_OPTION_FSCACHE)) 2395 return; 2396 if (mnt_s->fscache_key) { 2397 uniq = mnt_s->fscache_key->key.uniquifier; 2398 ulen = mnt_s->fscache_key->key.uniq_len; 2399 }; 2400 } else 2401 return; 2402 2403 nfs_fscache_get_super_cookie(sb, uniq, ulen); 2404 } 2405 #else 2406 static void nfs_get_cache_cookie(struct super_block *sb, 2407 struct nfs_parsed_mount_data *parsed, 2408 struct nfs_clone_mount *cloned) 2409 { 2410 } 2411 #endif 2412 2413 static int nfs_bdi_register(struct nfs_server *server) 2414 { 2415 return bdi_register_dev(&server->backing_dev_info, server->s_dev); 2416 } 2417 2418 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot, 2419 struct nfs_mount_info *mount_info) 2420 { 2421 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts); 2422 } 2423 EXPORT_SYMBOL_GPL(nfs_set_sb_security); 2424 2425 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot, 2426 struct nfs_mount_info *mount_info) 2427 { 2428 /* clone any lsm security options from the parent to the new sb */ 2429 security_sb_clone_mnt_opts(mount_info->cloned->sb, s); 2430 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) 2431 return -ESTALE; 2432 return 0; 2433 } 2434 EXPORT_SYMBOL_GPL(nfs_clone_sb_security); 2435 2436 struct dentry *nfs_fs_mount_common(struct nfs_server *server, 2437 int flags, const char *dev_name, 2438 struct nfs_mount_info *mount_info, 2439 struct nfs_subversion *nfs_mod) 2440 { 2441 struct super_block *s; 2442 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2443 int (*compare_super)(struct super_block *, void *) = nfs_compare_super; 2444 struct nfs_sb_mountdata sb_mntdata = { 2445 .mntflags = flags, 2446 .server = server, 2447 }; 2448 int error; 2449 2450 if (server->flags & NFS_MOUNT_UNSHARED) 2451 compare_super = NULL; 2452 2453 /* -o noac implies -o sync */ 2454 if (server->flags & NFS_MOUNT_NOAC) 2455 sb_mntdata.mntflags |= MS_SYNCHRONOUS; 2456 2457 /* Get a superblock - note that we may end up sharing one that already exists */ 2458 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata); 2459 if (IS_ERR(s)) { 2460 mntroot = ERR_CAST(s); 2461 goto out_err_nosb; 2462 } 2463 2464 if (s->s_fs_info != server) { 2465 nfs_free_server(server); 2466 server = NULL; 2467 } else { 2468 error = nfs_bdi_register(server); 2469 if (error) { 2470 mntroot = ERR_PTR(error); 2471 goto error_splat_bdi; 2472 } 2473 } 2474 2475 if (!s->s_root) { 2476 /* initial superblock/root creation */ 2477 mount_info->fill_super(s, mount_info); 2478 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned); 2479 } 2480 2481 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name); 2482 if (IS_ERR(mntroot)) 2483 goto error_splat_super; 2484 2485 error = mount_info->set_security(s, mntroot, mount_info); 2486 if (error) 2487 goto error_splat_root; 2488 2489 s->s_flags |= MS_ACTIVE; 2490 2491 out: 2492 return mntroot; 2493 2494 out_err_nosb: 2495 nfs_free_server(server); 2496 goto out; 2497 2498 error_splat_root: 2499 dput(mntroot); 2500 mntroot = ERR_PTR(error); 2501 error_splat_super: 2502 if (server && !s->s_root) 2503 bdi_unregister(&server->backing_dev_info); 2504 error_splat_bdi: 2505 deactivate_locked_super(s); 2506 goto out; 2507 } 2508 EXPORT_SYMBOL_GPL(nfs_fs_mount_common); 2509 2510 struct dentry *nfs_fs_mount(struct file_system_type *fs_type, 2511 int flags, const char *dev_name, void *raw_data) 2512 { 2513 struct nfs_mount_info mount_info = { 2514 .fill_super = nfs_fill_super, 2515 .set_security = nfs_set_sb_security, 2516 }; 2517 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2518 struct nfs_subversion *nfs_mod; 2519 int error; 2520 2521 mount_info.parsed = nfs_alloc_parsed_mount_data(); 2522 mount_info.mntfh = nfs_alloc_fhandle(); 2523 if (mount_info.parsed == NULL || mount_info.mntfh == NULL) 2524 goto out; 2525 2526 /* Validate the mount data */ 2527 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name); 2528 if (error == NFS_TEXT_DATA) 2529 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name); 2530 if (error < 0) { 2531 mntroot = ERR_PTR(error); 2532 goto out; 2533 } 2534 2535 nfs_mod = get_nfs_version(mount_info.parsed->version); 2536 if (IS_ERR(nfs_mod)) { 2537 mntroot = ERR_CAST(nfs_mod); 2538 goto out; 2539 } 2540 2541 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod); 2542 2543 put_nfs_version(nfs_mod); 2544 out: 2545 nfs_free_parsed_mount_data(mount_info.parsed); 2546 nfs_free_fhandle(mount_info.mntfh); 2547 return mntroot; 2548 } 2549 EXPORT_SYMBOL_GPL(nfs_fs_mount); 2550 2551 /* 2552 * Ensure that we unregister the bdi before kill_anon_super 2553 * releases the device name 2554 */ 2555 void nfs_put_super(struct super_block *s) 2556 { 2557 struct nfs_server *server = NFS_SB(s); 2558 2559 bdi_unregister(&server->backing_dev_info); 2560 } 2561 EXPORT_SYMBOL_GPL(nfs_put_super); 2562 2563 /* 2564 * Destroy an NFS2/3 superblock 2565 */ 2566 void nfs_kill_super(struct super_block *s) 2567 { 2568 struct nfs_server *server = NFS_SB(s); 2569 2570 kill_anon_super(s); 2571 nfs_fscache_release_super_cookie(s); 2572 nfs_free_server(server); 2573 } 2574 EXPORT_SYMBOL_GPL(nfs_kill_super); 2575 2576 /* 2577 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change) 2578 */ 2579 static struct dentry * 2580 nfs_xdev_mount(struct file_system_type *fs_type, int flags, 2581 const char *dev_name, void *raw_data) 2582 { 2583 struct nfs_clone_mount *data = raw_data; 2584 struct nfs_mount_info mount_info = { 2585 .fill_super = nfs_clone_super, 2586 .set_security = nfs_clone_sb_security, 2587 .cloned = data, 2588 }; 2589 struct nfs_server *server; 2590 struct dentry *mntroot = ERR_PTR(-ENOMEM); 2591 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod; 2592 int error; 2593 2594 dprintk("--> nfs_xdev_mount_common()\n"); 2595 2596 mount_info.mntfh = mount_info.cloned->fh; 2597 2598 /* create a new volume representation */ 2599 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); 2600 if (IS_ERR(server)) { 2601 error = PTR_ERR(server); 2602 goto out_err; 2603 } 2604 2605 mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod); 2606 dprintk("<-- nfs_xdev_mount_common() = 0\n"); 2607 out: 2608 return mntroot; 2609 2610 out_err: 2611 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error); 2612 goto out; 2613 } 2614 2615 #if IS_ENABLED(CONFIG_NFS_V4) 2616 2617 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args) 2618 { 2619 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3| 2620 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL); 2621 } 2622 2623 /* 2624 * Validate NFSv4 mount options 2625 */ 2626 static int nfs4_validate_mount_data(void *options, 2627 struct nfs_parsed_mount_data *args, 2628 const char *dev_name) 2629 { 2630 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address; 2631 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; 2632 char *c; 2633 2634 if (data == NULL) 2635 goto out_no_data; 2636 2637 args->version = 4; 2638 2639 switch (data->version) { 2640 case 1: 2641 if (data->host_addrlen > sizeof(args->nfs_server.address)) 2642 goto out_no_address; 2643 if (data->host_addrlen == 0) 2644 goto out_no_address; 2645 args->nfs_server.addrlen = data->host_addrlen; 2646 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 2647 return -EFAULT; 2648 if (!nfs_verify_server_address(sap)) 2649 goto out_no_address; 2650 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2651 2652 if (data->auth_flavourlen) { 2653 if (data->auth_flavourlen > 1) 2654 goto out_inval_auth; 2655 if (copy_from_user(&args->auth_flavors[0], 2656 data->auth_flavours, 2657 sizeof(args->auth_flavors[0]))) 2658 return -EFAULT; 2659 } 2660 2661 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 2662 if (IS_ERR(c)) 2663 return PTR_ERR(c); 2664 args->nfs_server.hostname = c; 2665 2666 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 2667 if (IS_ERR(c)) 2668 return PTR_ERR(c); 2669 args->nfs_server.export_path = c; 2670 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 2671 2672 c = strndup_user(data->client_addr.data, 16); 2673 if (IS_ERR(c)) 2674 return PTR_ERR(c); 2675 args->client_address = c; 2676 2677 /* 2678 * Translate to nfs_parsed_mount_data, which nfs4_fill_super 2679 * can deal with. 2680 */ 2681 2682 args->flags = data->flags & NFS4_MOUNT_FLAGMASK; 2683 args->rsize = data->rsize; 2684 args->wsize = data->wsize; 2685 args->timeo = data->timeo; 2686 args->retrans = data->retrans; 2687 args->acregmin = data->acregmin; 2688 args->acregmax = data->acregmax; 2689 args->acdirmin = data->acdirmin; 2690 args->acdirmax = data->acdirmax; 2691 args->nfs_server.protocol = data->proto; 2692 nfs_validate_transport_protocol(args); 2693 2694 break; 2695 default: 2696 return NFS_TEXT_DATA; 2697 } 2698 2699 return 0; 2700 2701 out_no_data: 2702 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); 2703 return -EINVAL; 2704 2705 out_inval_auth: 2706 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", 2707 data->auth_flavourlen); 2708 return -EINVAL; 2709 2710 out_no_address: 2711 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); 2712 return -EINVAL; 2713 } 2714 2715 /* 2716 * NFS v4 module parameters need to stay in the 2717 * NFS client for backwards compatibility 2718 */ 2719 unsigned int nfs_callback_set_tcpport; 2720 unsigned short nfs_callback_tcpport; 2721 /* Default cache timeout is 10 minutes */ 2722 unsigned int nfs_idmap_cache_timeout = 600; 2723 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ 2724 bool nfs4_disable_idmapping = true; 2725 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; 2726 unsigned short send_implementation_id = 1; 2727 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; 2728 2729 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); 2730 EXPORT_SYMBOL_GPL(nfs_callback_tcpport); 2731 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); 2732 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); 2733 EXPORT_SYMBOL_GPL(max_session_slots); 2734 EXPORT_SYMBOL_GPL(send_implementation_id); 2735 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); 2736 2737 #define NFS_CALLBACK_MAXPORTNR (65535U) 2738 2739 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2740 { 2741 unsigned long num; 2742 int ret; 2743 2744 if (!val) 2745 return -EINVAL; 2746 ret = kstrtoul(val, 0, &num); 2747 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR) 2748 return -EINVAL; 2749 *((unsigned int *)kp->arg) = num; 2750 return 0; 2751 } 2752 static struct kernel_param_ops param_ops_portnr = { 2753 .set = param_set_portnr, 2754 .get = param_get_uint, 2755 }; 2756 #define param_check_portnr(name, p) __param_check(name, p, unsigned int); 2757 2758 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); 2759 module_param(nfs_idmap_cache_timeout, int, 0644); 2760 module_param(nfs4_disable_idmapping, bool, 0644); 2761 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, 2762 NFS4_CLIENT_ID_UNIQ_LEN, 0600); 2763 MODULE_PARM_DESC(nfs4_disable_idmapping, 2764 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2765 module_param(max_session_slots, ushort, 0644); 2766 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " 2767 "requests the client will negotiate"); 2768 module_param(send_implementation_id, ushort, 0644); 2769 MODULE_PARM_DESC(send_implementation_id, 2770 "Send implementation ID with NFSv4.1 exchange_id"); 2771 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); 2772 MODULE_ALIAS("nfs4"); 2773 2774 #endif /* CONFIG_NFS_V4 */ 2775