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