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