1/*
   2 *  linux/fs/nfs/super.c
   3 *
   4 *  Copyright (C) 1992  Rick Sladkey
   5 *
   6 *  nfs superblock handling functions
   7 *
   8 *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
   9 *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
  10 *
  11 *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
  12 *  J.S.Peatfield@damtp.cam.ac.uk
  13 *
  14 *  Split from inode.c by David Howells <dhowells@redhat.com>
  15 *
  16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
  17 *   particular server are held in the same superblock
  18 * - NFS superblocks can have several effective roots to the dentry tree
  19 * - directory type roots are spliced into the tree when a path from one root reaches the root
  20 *   of another (see nfs_lookup())
  21 */
  22
  23#include <linux/module.h>
  24#include <linux/init.h>
  25
  26#include <linux/time.h>
  27#include <linux/kernel.h>
  28#include <linux/mm.h>
  29#include <linux/string.h>
  30#include <linux/stat.h>
  31#include <linux/errno.h>
  32#include <linux/unistd.h>
  33#include <linux/sunrpc/clnt.h>
  34#include <linux/sunrpc/addr.h>
  35#include <linux/sunrpc/stats.h>
  36#include <linux/sunrpc/metrics.h>
  37#include <linux/sunrpc/xprtsock.h>
  38#include <linux/sunrpc/xprtrdma.h>
  39#include <linux/nfs_fs.h>
  40#include <linux/nfs_mount.h>
  41#include <linux/nfs4_mount.h>
  42#include <linux/lockd/bind.h>
  43#include <linux/seq_file.h>
  44#include <linux/mount.h>
  45#include <linux/namei.h>
  46#include <linux/nfs_idmap.h>
  47#include <linux/vfs.h>
  48#include <linux/inet.h>
  49#include <linux/in6.h>
  50#include <linux/slab.h>
  51#include <net/ipv6.h>
  52#include <linux/netdevice.h>
  53#include <linux/nfs_xdr.h>
  54#include <linux/magic.h>
  55#include <linux/parser.h>
  56#include <linux/nsproxy.h>
  57#include <linux/rcupdate.h>
  58
  59#include <asm/uaccess.h>
 
  60
  61#include "nfs4_fs.h"
  62#include "callback.h"
  63#include "delegation.h"
  64#include "iostat.h"
  65#include "internal.h"
  66#include "fscache.h"
  67#include "nfs4session.h"
  68#include "pnfs.h"
  69#include "nfs.h"
  70
  71#define NFSDBG_FACILITY		NFSDBG_VFS
  72#define NFS_TEXT_DATA		1
  73
  74#if IS_ENABLED(CONFIG_NFS_V3)
  75#define NFS_DEFAULT_VERSION 3
  76#else
  77#define NFS_DEFAULT_VERSION 2
  78#endif
  79
  80enum {
  81	/* Mount options that take no arguments */
  82	Opt_soft, Opt_hard,
  83	Opt_posix, Opt_noposix,
  84	Opt_cto, Opt_nocto,
  85	Opt_ac, Opt_noac,
  86	Opt_lock, Opt_nolock,
  87	Opt_udp, Opt_tcp, Opt_rdma,
  88	Opt_acl, Opt_noacl,
  89	Opt_rdirplus, Opt_nordirplus,
  90	Opt_sharecache, Opt_nosharecache,
  91	Opt_resvport, Opt_noresvport,
  92	Opt_fscache, Opt_nofscache,
  93	Opt_migration, Opt_nomigration,
  94
  95	/* Mount options that take integer arguments */
  96	Opt_port,
  97	Opt_rsize, Opt_wsize, Opt_bsize,
  98	Opt_timeo, Opt_retrans,
  99	Opt_acregmin, Opt_acregmax,
 100	Opt_acdirmin, Opt_acdirmax,
 101	Opt_actimeo,
 102	Opt_namelen,
 103	Opt_mountport,
 104	Opt_mountvers,
 105	Opt_minorversion,
 106
 107	/* Mount options that take string arguments */
 108	Opt_nfsvers,
 109	Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
 110	Opt_addr, Opt_mountaddr, Opt_clientaddr,
 111	Opt_lookupcache,
 112	Opt_fscache_uniq,
 113	Opt_local_lock,
 114
 115	/* Special mount options */
 116	Opt_userspace, Opt_deprecated, Opt_sloppy,
 117
 118	Opt_err
 119};
 120
 121static const match_table_t nfs_mount_option_tokens = {
 122	{ Opt_userspace, "bg" },
 123	{ Opt_userspace, "fg" },
 124	{ Opt_userspace, "retry=%s" },
 125
 126	{ Opt_sloppy, "sloppy" },
 127
 128	{ Opt_soft, "soft" },
 129	{ Opt_hard, "hard" },
 130	{ Opt_deprecated, "intr" },
 131	{ Opt_deprecated, "nointr" },
 132	{ Opt_posix, "posix" },
 133	{ Opt_noposix, "noposix" },
 134	{ Opt_cto, "cto" },
 135	{ Opt_nocto, "nocto" },
 136	{ Opt_ac, "ac" },
 137	{ Opt_noac, "noac" },
 138	{ Opt_lock, "lock" },
 139	{ Opt_nolock, "nolock" },
 140	{ Opt_udp, "udp" },
 141	{ Opt_tcp, "tcp" },
 142	{ Opt_rdma, "rdma" },
 143	{ Opt_acl, "acl" },
 144	{ Opt_noacl, "noacl" },
 145	{ Opt_rdirplus, "rdirplus" },
 146	{ Opt_nordirplus, "nordirplus" },
 147	{ Opt_sharecache, "sharecache" },
 148	{ Opt_nosharecache, "nosharecache" },
 149	{ Opt_resvport, "resvport" },
 150	{ Opt_noresvport, "noresvport" },
 151	{ Opt_fscache, "fsc" },
 152	{ Opt_nofscache, "nofsc" },
 153	{ Opt_migration, "migration" },
 154	{ Opt_nomigration, "nomigration" },
 155
 156	{ Opt_port, "port=%s" },
 157	{ Opt_rsize, "rsize=%s" },
 158	{ Opt_wsize, "wsize=%s" },
 159	{ Opt_bsize, "bsize=%s" },
 160	{ Opt_timeo, "timeo=%s" },
 161	{ Opt_retrans, "retrans=%s" },
 162	{ Opt_acregmin, "acregmin=%s" },
 163	{ Opt_acregmax, "acregmax=%s" },
 164	{ Opt_acdirmin, "acdirmin=%s" },
 165	{ Opt_acdirmax, "acdirmax=%s" },
 166	{ Opt_actimeo, "actimeo=%s" },
 167	{ Opt_namelen, "namlen=%s" },
 168	{ Opt_mountport, "mountport=%s" },
 169	{ Opt_mountvers, "mountvers=%s" },
 170	{ Opt_minorversion, "minorversion=%s" },
 171
 172	{ Opt_nfsvers, "nfsvers=%s" },
 173	{ Opt_nfsvers, "vers=%s" },
 174
 175	{ Opt_sec, "sec=%s" },
 176	{ Opt_proto, "proto=%s" },
 177	{ Opt_mountproto, "mountproto=%s" },
 178	{ Opt_addr, "addr=%s" },
 179	{ Opt_clientaddr, "clientaddr=%s" },
 180	{ Opt_mounthost, "mounthost=%s" },
 181	{ Opt_mountaddr, "mountaddr=%s" },
 182
 183	{ Opt_lookupcache, "lookupcache=%s" },
 184	{ Opt_fscache_uniq, "fsc=%s" },
 185	{ Opt_local_lock, "local_lock=%s" },
 186
 187	/* The following needs to be listed after all other options */
 188	{ Opt_nfsvers, "v%s" },
 189
 190	{ Opt_err, NULL }
 191};
 192
 193enum {
 194	Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
 195
 196	Opt_xprt_err
 197};
 198
 199static const match_table_t nfs_xprt_protocol_tokens = {
 200	{ Opt_xprt_udp, "udp" },
 201	{ Opt_xprt_udp6, "udp6" },
 202	{ Opt_xprt_tcp, "tcp" },
 203	{ Opt_xprt_tcp6, "tcp6" },
 204	{ Opt_xprt_rdma, "rdma" },
 205
 206	{ Opt_xprt_err, NULL }
 207};
 208
 209enum {
 210	Opt_sec_none, Opt_sec_sys,
 211	Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
 212	Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
 213	Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
 214
 215	Opt_sec_err
 216};
 217
 218static const match_table_t nfs_secflavor_tokens = {
 219	{ Opt_sec_none, "none" },
 220	{ Opt_sec_none, "null" },
 221	{ Opt_sec_sys, "sys" },
 222
 223	{ Opt_sec_krb5, "krb5" },
 224	{ Opt_sec_krb5i, "krb5i" },
 225	{ Opt_sec_krb5p, "krb5p" },
 226
 227	{ Opt_sec_lkey, "lkey" },
 228	{ Opt_sec_lkeyi, "lkeyi" },
 229	{ Opt_sec_lkeyp, "lkeyp" },
 230
 231	{ Opt_sec_spkm, "spkm3" },
 232	{ Opt_sec_spkmi, "spkm3i" },
 233	{ Opt_sec_spkmp, "spkm3p" },
 234
 235	{ Opt_sec_err, NULL }
 236};
 237
 238enum {
 239	Opt_lookupcache_all, Opt_lookupcache_positive,
 240	Opt_lookupcache_none,
 241
 242	Opt_lookupcache_err
 243};
 244
 245static match_table_t nfs_lookupcache_tokens = {
 246	{ Opt_lookupcache_all, "all" },
 247	{ Opt_lookupcache_positive, "pos" },
 248	{ Opt_lookupcache_positive, "positive" },
 249	{ Opt_lookupcache_none, "none" },
 250
 251	{ Opt_lookupcache_err, NULL }
 252};
 253
 254enum {
 255	Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
 256	Opt_local_lock_none,
 257
 258	Opt_local_lock_err
 259};
 260
 261static match_table_t nfs_local_lock_tokens = {
 262	{ Opt_local_lock_all, "all" },
 263	{ Opt_local_lock_flock, "flock" },
 264	{ Opt_local_lock_posix, "posix" },
 265	{ Opt_local_lock_none, "none" },
 266
 267	{ Opt_local_lock_err, NULL }
 268};
 269
 270enum {
 271	Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
 272	Opt_vers_4_1, Opt_vers_4_2,
 273
 274	Opt_vers_err
 275};
 276
 277static match_table_t nfs_vers_tokens = {
 278	{ Opt_vers_2, "2" },
 279	{ Opt_vers_3, "3" },
 280	{ Opt_vers_4, "4" },
 281	{ Opt_vers_4_0, "4.0" },
 282	{ Opt_vers_4_1, "4.1" },
 283	{ Opt_vers_4_2, "4.2" },
 284
 285	{ Opt_vers_err, NULL }
 286};
 287
 288static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
 289		int flags, const char *dev_name, void *raw_data);
 290
 291struct file_system_type nfs_fs_type = {
 292	.owner		= THIS_MODULE,
 293	.name		= "nfs",
 294	.mount		= nfs_fs_mount,
 295	.kill_sb	= nfs_kill_super,
 296	.fs_flags	= FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
 297};
 298MODULE_ALIAS_FS("nfs");
 299EXPORT_SYMBOL_GPL(nfs_fs_type);
 300
 301struct file_system_type nfs_xdev_fs_type = {
 302	.owner		= THIS_MODULE,
 303	.name		= "nfs",
 304	.mount		= nfs_xdev_mount,
 305	.kill_sb	= nfs_kill_super,
 306	.fs_flags	= FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
 307};
 308
 309const struct super_operations nfs_sops = {
 310	.alloc_inode	= nfs_alloc_inode,
 311	.destroy_inode	= nfs_destroy_inode,
 312	.write_inode	= nfs_write_inode,
 313	.drop_inode	= nfs_drop_inode,
 314	.put_super	= nfs_put_super,
 315	.statfs		= nfs_statfs,
 316	.evict_inode	= nfs_evict_inode,
 317	.umount_begin	= nfs_umount_begin,
 318	.show_options	= nfs_show_options,
 319	.show_devname	= nfs_show_devname,
 320	.show_path	= nfs_show_path,
 321	.show_stats	= nfs_show_stats,
 322	.remount_fs	= nfs_remount,
 323};
 324EXPORT_SYMBOL_GPL(nfs_sops);
 325
 326#if IS_ENABLED(CONFIG_NFS_V4)
 327static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
 328static int nfs4_validate_mount_data(void *options,
 329	struct nfs_parsed_mount_data *args, const char *dev_name);
 330
 331struct file_system_type nfs4_fs_type = {
 332	.owner		= THIS_MODULE,
 333	.name		= "nfs4",
 334	.mount		= nfs_fs_mount,
 335	.kill_sb	= nfs_kill_super,
 336	.fs_flags	= FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
 337};
 338MODULE_ALIAS_FS("nfs4");
 339MODULE_ALIAS("nfs4");
 340EXPORT_SYMBOL_GPL(nfs4_fs_type);
 341
 
 342static int __init register_nfs4_fs(void)
 343{
 344	return register_filesystem(&nfs4_fs_type);
 345}
 346
 347static void unregister_nfs4_fs(void)
 348{
 349	unregister_filesystem(&nfs4_fs_type);
 350}
 351#else
 352static int __init register_nfs4_fs(void)
 353{
 354	return 0;
 355}
 356
 357static void unregister_nfs4_fs(void)
 358{
 359}
 360#endif
 361
 
 
 
 
 
 
 
 
 
 
 
 
 362static struct shrinker acl_shrinker = {
 363	.count_objects	= nfs_access_cache_count,
 364	.scan_objects	= nfs_access_cache_scan,
 365	.seeks		= DEFAULT_SEEKS,
 366};
 367
 368/*
 369 * Register the NFS filesystems
 370 */
 371int __init register_nfs_fs(void)
 372{
 373	int ret;
 374
 375        ret = register_filesystem(&nfs_fs_type);
 376	if (ret < 0)
 377		goto error_0;
 378
 379	ret = register_nfs4_fs();
 380	if (ret < 0)
 381		goto error_1;
 382
 383	ret = nfs_register_sysctl();
 384	if (ret < 0)
 385		goto error_2;
 386	register_shrinker(&acl_shrinker);
 
 
 
 
 
 387	return 0;
 388
 
 389error_2:
 390	unregister_nfs4_fs();
 391error_1:
 392	unregister_filesystem(&nfs_fs_type);
 393error_0:
 394	return ret;
 395}
 396
 397/*
 398 * Unregister the NFS filesystems
 399 */
 400void __exit unregister_nfs_fs(void)
 401{
 402	unregister_shrinker(&acl_shrinker);
 403	nfs_unregister_sysctl();
 404	unregister_nfs4_fs();
 
 
 
 405	unregister_filesystem(&nfs_fs_type);
 406}
 407
 408void nfs_sb_active(struct super_block *sb)
 409{
 410	struct nfs_server *server = NFS_SB(sb);
 411
 412	if (atomic_inc_return(&server->active) == 1)
 413		atomic_inc(&sb->s_active);
 
 
 
 414}
 415EXPORT_SYMBOL_GPL(nfs_sb_active);
 416
 417void nfs_sb_deactive(struct super_block *sb)
 418{
 419	struct nfs_server *server = NFS_SB(sb);
 420
 421	if (atomic_dec_and_test(&server->active))
 422		deactivate_super(sb);
 423}
 424EXPORT_SYMBOL_GPL(nfs_sb_deactive);
 425
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 426/*
 427 * Deliver file system statistics to userspace
 428 */
 429int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 430{
 431	struct nfs_server *server = NFS_SB(dentry->d_sb);
 432	unsigned char blockbits;
 433	unsigned long blockres;
 434	struct nfs_fh *fh = NFS_FH(dentry->d_inode);
 435	struct nfs_fsstat res;
 436	int error = -ENOMEM;
 437
 438	res.fattr = nfs_alloc_fattr();
 439	if (res.fattr == NULL)
 440		goto out_err;
 441
 442	error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
 443	if (unlikely(error == -ESTALE)) {
 444		struct dentry *pd_dentry;
 445
 446		pd_dentry = dget_parent(dentry);
 447		if (pd_dentry != NULL) {
 448			nfs_zap_caches(pd_dentry->d_inode);
 449			dput(pd_dentry);
 450		}
 451	}
 452	nfs_free_fattr(res.fattr);
 453	if (error < 0)
 454		goto out_err;
 455
 456	buf->f_type = NFS_SUPER_MAGIC;
 457
 458	/*
 459	 * Current versions of glibc do not correctly handle the
 460	 * case where f_frsize != f_bsize.  Eventually we want to
 461	 * report the value of wtmult in this field.
 462	 */
 463	buf->f_frsize = dentry->d_sb->s_blocksize;
 464
 465	/*
 466	 * On most *nix systems, f_blocks, f_bfree, and f_bavail
 467	 * are reported in units of f_frsize.  Linux hasn't had
 468	 * an f_frsize field in its statfs struct until recently,
 469	 * thus historically Linux's sys_statfs reports these
 470	 * fields in units of f_bsize.
 471	 */
 472	buf->f_bsize = dentry->d_sb->s_blocksize;
 473	blockbits = dentry->d_sb->s_blocksize_bits;
 474	blockres = (1 << blockbits) - 1;
 475	buf->f_blocks = (res.tbytes + blockres) >> blockbits;
 476	buf->f_bfree = (res.fbytes + blockres) >> blockbits;
 477	buf->f_bavail = (res.abytes + blockres) >> blockbits;
 478
 479	buf->f_files = res.tfiles;
 480	buf->f_ffree = res.afiles;
 481
 482	buf->f_namelen = server->namelen;
 483
 484	return 0;
 485
 486 out_err:
 487	dprintk("%s: statfs error = %d\n", __func__, -error);
 488	return error;
 489}
 490EXPORT_SYMBOL_GPL(nfs_statfs);
 491
 492/*
 493 * Map the security flavour number to a name
 494 */
 495static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
 496{
 497	static const struct {
 498		rpc_authflavor_t flavour;
 499		const char *str;
 500	} sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
 501		/* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
 502		{ RPC_AUTH_NULL, "null" },
 503		{ RPC_AUTH_UNIX, "sys" },
 504		{ RPC_AUTH_GSS_KRB5, "krb5" },
 505		{ RPC_AUTH_GSS_KRB5I, "krb5i" },
 506		{ RPC_AUTH_GSS_KRB5P, "krb5p" },
 507		{ RPC_AUTH_GSS_LKEY, "lkey" },
 508		{ RPC_AUTH_GSS_LKEYI, "lkeyi" },
 509		{ RPC_AUTH_GSS_LKEYP, "lkeyp" },
 510		{ RPC_AUTH_GSS_SPKM, "spkm" },
 511		{ RPC_AUTH_GSS_SPKMI, "spkmi" },
 512		{ RPC_AUTH_GSS_SPKMP, "spkmp" },
 513		{ UINT_MAX, "unknown" }
 514	};
 515	int i;
 516
 517	for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
 518		if (sec_flavours[i].flavour == flavour)
 519			break;
 520	}
 521	return sec_flavours[i].str;
 522}
 523
 524static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
 525				  int showdefaults)
 526{
 527	struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
 
 528
 529	seq_printf(m, ",mountproto=");
 530	switch (sap->sa_family) {
 531	case AF_INET:
 532		switch (nfss->mountd_protocol) {
 533		case IPPROTO_UDP:
 534			seq_printf(m, RPCBIND_NETID_UDP);
 535			break;
 536		case IPPROTO_TCP:
 537			seq_printf(m, RPCBIND_NETID_TCP);
 538			break;
 539		default:
 540			if (showdefaults)
 541				seq_printf(m, "auto");
 542		}
 543		break;
 544	case AF_INET6:
 545		switch (nfss->mountd_protocol) {
 546		case IPPROTO_UDP:
 547			seq_printf(m, RPCBIND_NETID_UDP6);
 548			break;
 549		case IPPROTO_TCP:
 550			seq_printf(m, RPCBIND_NETID_TCP6);
 551			break;
 552		default:
 553			if (showdefaults)
 554				seq_printf(m, "auto");
 555		}
 556		break;
 557	default:
 558		if (showdefaults)
 559			seq_printf(m, "auto");
 560	}
 
 
 561}
 562
 563static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
 564				    int showdefaults)
 565{
 566	struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
 567
 568	if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
 569		return;
 570
 571	switch (sap->sa_family) {
 572	case AF_INET: {
 573		struct sockaddr_in *sin = (struct sockaddr_in *)sap;
 574		seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
 575		break;
 576	}
 577	case AF_INET6: {
 578		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
 579		seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
 580		break;
 581	}
 582	default:
 583		if (showdefaults)
 584			seq_printf(m, ",mountaddr=unspecified");
 585	}
 586
 587	if (nfss->mountd_version || showdefaults)
 588		seq_printf(m, ",mountvers=%u", nfss->mountd_version);
 589	if ((nfss->mountd_port &&
 590		nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
 591		showdefaults)
 592		seq_printf(m, ",mountport=%u", nfss->mountd_port);
 593
 594	nfs_show_mountd_netid(m, nfss, showdefaults);
 595}
 596
 597#if IS_ENABLED(CONFIG_NFS_V4)
 598static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
 599				    int showdefaults)
 600{
 601	struct nfs_client *clp = nfss->nfs_client;
 602
 603	seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
 604}
 605#else
 606static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
 607				    int showdefaults)
 608{
 609}
 610#endif
 611
 612static void nfs_show_nfs_version(struct seq_file *m,
 613		unsigned int version,
 614		unsigned int minorversion)
 615{
 616	seq_printf(m, ",vers=%u", version);
 617	if (version == 4)
 618		seq_printf(m, ".%u", minorversion);
 619}
 620
 621/*
 622 * Describe the mount options in force on this server representation
 623 */
 624static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
 625				   int showdefaults)
 626{
 627	static const struct proc_nfs_info {
 628		int flag;
 629		const char *str;
 630		const char *nostr;
 631	} nfs_info[] = {
 632		{ NFS_MOUNT_SOFT, ",soft", ",hard" },
 
 
 633		{ NFS_MOUNT_POSIX, ",posix", "" },
 634		{ NFS_MOUNT_NOCTO, ",nocto", "" },
 635		{ NFS_MOUNT_NOAC, ",noac", "" },
 636		{ NFS_MOUNT_NONLM, ",nolock", "" },
 637		{ NFS_MOUNT_NOACL, ",noacl", "" },
 638		{ NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
 639		{ NFS_MOUNT_UNSHARED, ",nosharecache", "" },
 640		{ NFS_MOUNT_NORESVPORT, ",noresvport", "" },
 641		{ 0, NULL, NULL }
 642	};
 643	const struct proc_nfs_info *nfs_infop;
 644	struct nfs_client *clp = nfss->nfs_client;
 645	u32 version = clp->rpc_ops->version;
 646	int local_flock, local_fcntl;
 647
 648	nfs_show_nfs_version(m, version, clp->cl_minorversion);
 649	seq_printf(m, ",rsize=%u", nfss->rsize);
 650	seq_printf(m, ",wsize=%u", nfss->wsize);
 651	if (nfss->bsize != 0)
 652		seq_printf(m, ",bsize=%u", nfss->bsize);
 653	seq_printf(m, ",namlen=%u", nfss->namelen);
 654	if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
 655		seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
 656	if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
 657		seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
 658	if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
 659		seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
 660	if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
 661		seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
 
 
 662	for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
 663		if (nfss->flags & nfs_infop->flag)
 664			seq_puts(m, nfs_infop->str);
 665		else
 666			seq_puts(m, nfs_infop->nostr);
 667	}
 668	rcu_read_lock();
 669	seq_printf(m, ",proto=%s",
 670		   rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
 671	rcu_read_unlock();
 
 
 672	if (version == 4) {
 673		if (nfss->port != NFS_PORT)
 674			seq_printf(m, ",port=%u", nfss->port);
 675	} else
 676		if (nfss->port)
 677			seq_printf(m, ",port=%u", nfss->port);
 678
 679	seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
 680	seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
 681	seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
 682
 683	if (version != 4)
 684		nfs_show_mountd_options(m, nfss, showdefaults);
 685	else
 686		nfs_show_nfsv4_options(m, nfss, showdefaults);
 687
 688	if (nfss->options & NFS_OPTION_FSCACHE)
 689		seq_printf(m, ",fsc");
 690
 691	if (nfss->options & NFS_OPTION_MIGRATION)
 692		seq_printf(m, ",migration");
 693
 694	if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
 695		if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
 696			seq_printf(m, ",lookupcache=none");
 697		else
 698			seq_printf(m, ",lookupcache=pos");
 699	}
 700
 701	local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
 702	local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
 703
 704	if (!local_flock && !local_fcntl)
 705		seq_printf(m, ",local_lock=none");
 706	else if (local_flock && local_fcntl)
 707		seq_printf(m, ",local_lock=all");
 708	else if (local_flock)
 709		seq_printf(m, ",local_lock=flock");
 710	else
 711		seq_printf(m, ",local_lock=posix");
 
 
 
 
 
 
 
 712}
 713
 714/*
 715 * Describe the mount options on this VFS mountpoint
 716 */
 717int nfs_show_options(struct seq_file *m, struct dentry *root)
 718{
 719	struct nfs_server *nfss = NFS_SB(root->d_sb);
 720
 721	nfs_show_mount_options(m, nfss, 0);
 722
 723	rcu_read_lock();
 724	seq_printf(m, ",addr=%s",
 725			rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
 726							RPC_DISPLAY_ADDR));
 727	rcu_read_unlock();
 728
 729	return 0;
 730}
 731EXPORT_SYMBOL_GPL(nfs_show_options);
 732
 733#if IS_ENABLED(CONFIG_NFS_V4)
 
 
 
 
 
 
 
 
 
 
 734#ifdef CONFIG_NFS_V4_1
 735static void show_sessions(struct seq_file *m, struct nfs_server *server)
 736{
 737	if (nfs4_has_session(server->nfs_client))
 738		seq_printf(m, ",sessions");
 739}
 740#else
 741static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
 742#endif
 743#endif
 744
 745#ifdef CONFIG_NFS_V4_1
 746static void show_pnfs(struct seq_file *m, struct nfs_server *server)
 747{
 748	seq_printf(m, ",pnfs=");
 749	if (server->pnfs_curr_ld)
 750		seq_printf(m, "%s", server->pnfs_curr_ld->name);
 751	else
 752		seq_printf(m, "not configured");
 753}
 754
 755static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
 756{
 757	if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
 758		struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
 759		seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
 760			   "date='%llu,%u'",
 761			   impl_id->name, impl_id->domain,
 762			   impl_id->date.seconds, impl_id->date.nseconds);
 763	}
 764}
 765#else
 766#if IS_ENABLED(CONFIG_NFS_V4)
 767static void show_pnfs(struct seq_file *m, struct nfs_server *server)
 768{
 769}
 770#endif
 771static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
 772{
 773}
 774#endif
 775
 776int nfs_show_devname(struct seq_file *m, struct dentry *root)
 777{
 778	char *page = (char *) __get_free_page(GFP_KERNEL);
 779	char *devname, *dummy;
 780	int err = 0;
 781	if (!page)
 782		return -ENOMEM;
 783	devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
 784	if (IS_ERR(devname))
 785		err = PTR_ERR(devname);
 786	else
 787		seq_escape(m, devname, " \t\n\\");
 788	free_page((unsigned long)page);
 789	return err;
 790}
 791EXPORT_SYMBOL_GPL(nfs_show_devname);
 792
 793int nfs_show_path(struct seq_file *m, struct dentry *dentry)
 794{
 795	seq_puts(m, "/");
 796	return 0;
 797}
 798EXPORT_SYMBOL_GPL(nfs_show_path);
 799
 800/*
 801 * Present statistical information for this VFS mountpoint
 802 */
 803int nfs_show_stats(struct seq_file *m, struct dentry *root)
 804{
 805	int i, cpu;
 806	struct nfs_server *nfss = NFS_SB(root->d_sb);
 807	struct rpc_auth *auth = nfss->client->cl_auth;
 808	struct nfs_iostats totals = { };
 809
 810	seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
 811
 812	/*
 813	 * Display all mount option settings
 814	 */
 815	seq_printf(m, "\n\topts:\t");
 816	seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
 817	seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
 818	seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
 819	seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
 820	nfs_show_mount_options(m, nfss, 1);
 821
 822	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
 823
 824	show_implementation_id(m, nfss);
 825
 826	seq_printf(m, "\n\tcaps:\t");
 827	seq_printf(m, "caps=0x%x", nfss->caps);
 828	seq_printf(m, ",wtmult=%u", nfss->wtmult);
 829	seq_printf(m, ",dtsize=%u", nfss->dtsize);
 830	seq_printf(m, ",bsize=%u", nfss->bsize);
 831	seq_printf(m, ",namlen=%u", nfss->namelen);
 832
 833#if IS_ENABLED(CONFIG_NFS_V4)
 834	if (nfss->nfs_client->rpc_ops->version == 4) {
 835		seq_printf(m, "\n\tnfsv4:\t");
 836		seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
 837		seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
 838		seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
 839		seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
 840		show_sessions(m, nfss);
 841		show_pnfs(m, nfss);
 
 842	}
 843#endif
 844
 845	/*
 846	 * Display security flavor in effect for this mount
 847	 */
 848	seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
 849	if (auth->au_flavor)
 850		seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
 851
 852	/*
 853	 * Display superblock I/O counters
 854	 */
 855	for_each_possible_cpu(cpu) {
 856		struct nfs_iostats *stats;
 857
 858		preempt_disable();
 859		stats = per_cpu_ptr(nfss->io_stats, cpu);
 860
 861		for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 862			totals.events[i] += stats->events[i];
 863		for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 864			totals.bytes[i] += stats->bytes[i];
 865#ifdef CONFIG_NFS_FSCACHE
 866		for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
 867			totals.fscache[i] += stats->fscache[i];
 868#endif
 869
 870		preempt_enable();
 871	}
 872
 873	seq_printf(m, "\n\tevents:\t");
 874	for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
 875		seq_printf(m, "%lu ", totals.events[i]);
 876	seq_printf(m, "\n\tbytes:\t");
 877	for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 878		seq_printf(m, "%Lu ", totals.bytes[i]);
 879#ifdef CONFIG_NFS_FSCACHE
 880	if (nfss->options & NFS_OPTION_FSCACHE) {
 881		seq_printf(m, "\n\tfsc:\t");
 882		for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
 883			seq_printf(m, "%Lu ", totals.bytes[i]);
 884	}
 885#endif
 886	seq_printf(m, "\n");
 887
 888	rpc_print_iostats(m, nfss->client);
 889
 890	return 0;
 891}
 892EXPORT_SYMBOL_GPL(nfs_show_stats);
 893
 894/*
 895 * Begin unmount by attempting to remove all automounted mountpoints we added
 896 * in response to xdev traversals and referrals
 897 */
 898void nfs_umount_begin(struct super_block *sb)
 899{
 900	struct nfs_server *server;
 901	struct rpc_clnt *rpc;
 902
 903	server = NFS_SB(sb);
 904	/* -EIO all pending I/O */
 905	rpc = server->client_acl;
 906	if (!IS_ERR(rpc))
 907		rpc_killall_tasks(rpc);
 908	rpc = server->client;
 909	if (!IS_ERR(rpc))
 910		rpc_killall_tasks(rpc);
 911}
 912EXPORT_SYMBOL_GPL(nfs_umount_begin);
 913
 914static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
 915{
 916	struct nfs_parsed_mount_data *data;
 917
 918	data = kzalloc(sizeof(*data), GFP_KERNEL);
 919	if (data) {
 920		data->acregmin		= NFS_DEF_ACREGMIN;
 921		data->acregmax		= NFS_DEF_ACREGMAX;
 922		data->acdirmin		= NFS_DEF_ACDIRMIN;
 923		data->acdirmax		= NFS_DEF_ACDIRMAX;
 924		data->mount_server.port	= NFS_UNSPEC_PORT;
 925		data->nfs_server.port	= NFS_UNSPEC_PORT;
 926		data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 927		data->selected_flavor	= RPC_AUTH_MAXFLAVOR;
 928		data->minorversion	= 0;
 929		data->need_mount	= true;
 930		data->net		= current->nsproxy->net_ns;
 931		security_init_mnt_opts(&data->lsm_opts);
 932	}
 933	return data;
 934}
 935
 936static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
 937{
 938	if (data) {
 939		kfree(data->client_address);
 940		kfree(data->mount_server.hostname);
 941		kfree(data->nfs_server.export_path);
 942		kfree(data->nfs_server.hostname);
 943		kfree(data->fscache_uniq);
 944		security_free_mnt_opts(&data->lsm_opts);
 945		kfree(data);
 946	}
 947}
 948
 949/*
 950 * Sanity-check a server address provided by the mount command.
 951 *
 952 * Address family must be initialized, and address must not be
 953 * the ANY address for that family.
 954 */
 955static int nfs_verify_server_address(struct sockaddr *addr)
 956{
 957	switch (addr->sa_family) {
 958	case AF_INET: {
 959		struct sockaddr_in *sa = (struct sockaddr_in *)addr;
 960		return sa->sin_addr.s_addr != htonl(INADDR_ANY);
 961	}
 962	case AF_INET6: {
 963		struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
 964		return !ipv6_addr_any(sa);
 965	}
 966	}
 967
 968	dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
 969	return 0;
 970}
 971
 972/*
 973 * Select between a default port value and a user-specified port value.
 974 * If a zero value is set, then autobind will be used.
 975 */
 976static void nfs_set_port(struct sockaddr *sap, int *port,
 977				 const unsigned short default_port)
 978{
 979	if (*port == NFS_UNSPEC_PORT)
 980		*port = default_port;
 981
 982	rpc_set_port(sap, *port);
 983}
 984
 985/*
 986 * Sanity check the NFS transport protocol.
 987 *
 988 */
 989static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
 990{
 991	switch (mnt->nfs_server.protocol) {
 992	case XPRT_TRANSPORT_UDP:
 993	case XPRT_TRANSPORT_TCP:
 994	case XPRT_TRANSPORT_RDMA:
 995		break;
 996	default:
 997		mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
 998	}
 999}
1000
1001/*
1002 * For text based NFSv2/v3 mounts, the mount protocol transport default
1003 * settings should depend upon the specified NFS transport.
1004 */
1005static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1006{
1007	nfs_validate_transport_protocol(mnt);
1008
1009	if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1010	    mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1011			return;
1012	switch (mnt->nfs_server.protocol) {
1013	case XPRT_TRANSPORT_UDP:
1014		mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1015		break;
1016	case XPRT_TRANSPORT_TCP:
1017	case XPRT_TRANSPORT_RDMA:
1018		mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1019	}
1020}
1021
1022/*
1023 * Add 'flavor' to 'auth_info' if not already present.
1024 * Returns true if 'flavor' ends up in the list, false otherwise
1025 */
1026static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1027			      rpc_authflavor_t flavor)
1028{
1029	unsigned int i;
1030	unsigned int max_flavor_len = (sizeof(auth_info->flavors) /
1031				       sizeof(auth_info->flavors[0]));
1032
1033	/* make sure this flavor isn't already in the list */
1034	for (i = 0; i < auth_info->flavor_len; i++) {
1035		if (flavor == auth_info->flavors[i])
1036			return true;
1037	}
1038
1039	if (auth_info->flavor_len + 1 >= max_flavor_len) {
1040		dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1041		return false;
1042	}
1043
1044	auth_info->flavors[auth_info->flavor_len++] = flavor;
1045	return true;
1046}
1047
1048/*
1049 * Return true if 'match' is in auth_info or auth_info is empty.
1050 * Return false otherwise.
1051 */
1052bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1053			 rpc_authflavor_t match)
1054{
1055	int i;
1056
1057	if (!auth_info->flavor_len)
1058		return true;
1059
1060	for (i = 0; i < auth_info->flavor_len; i++) {
1061		if (auth_info->flavors[i] == match)
1062			return true;
1063	}
1064	return false;
1065}
1066EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1067
1068/*
1069 * Parse the value of the 'sec=' option.
1070 */
1071static int nfs_parse_security_flavors(char *value,
1072				      struct nfs_parsed_mount_data *mnt)
1073{
1074	substring_t args[MAX_OPT_ARGS];
1075	rpc_authflavor_t pseudoflavor;
1076	char *p;
1077
1078	dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1079
1080	while ((p = strsep(&value, ":")) != NULL) {
1081		switch (match_token(p, nfs_secflavor_tokens, args)) {
1082		case Opt_sec_none:
1083			pseudoflavor = RPC_AUTH_NULL;
1084			break;
1085		case Opt_sec_sys:
1086			pseudoflavor = RPC_AUTH_UNIX;
1087			break;
1088		case Opt_sec_krb5:
1089			pseudoflavor = RPC_AUTH_GSS_KRB5;
1090			break;
1091		case Opt_sec_krb5i:
1092			pseudoflavor = RPC_AUTH_GSS_KRB5I;
1093			break;
1094		case Opt_sec_krb5p:
1095			pseudoflavor = RPC_AUTH_GSS_KRB5P;
1096			break;
1097		case Opt_sec_lkey:
1098			pseudoflavor = RPC_AUTH_GSS_LKEY;
1099			break;
1100		case Opt_sec_lkeyi:
1101			pseudoflavor = RPC_AUTH_GSS_LKEYI;
1102			break;
1103		case Opt_sec_lkeyp:
1104			pseudoflavor = RPC_AUTH_GSS_LKEYP;
1105			break;
1106		case Opt_sec_spkm:
1107			pseudoflavor = RPC_AUTH_GSS_SPKM;
1108			break;
1109		case Opt_sec_spkmi:
1110			pseudoflavor = RPC_AUTH_GSS_SPKMI;
1111			break;
1112		case Opt_sec_spkmp:
1113			pseudoflavor = RPC_AUTH_GSS_SPKMP;
1114			break;
1115		default:
1116			dfprintk(MOUNT,
1117				 "NFS: sec= option '%s' not recognized\n", p);
1118			return 0;
1119		}
1120
1121		if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1122			return 0;
1123	}
1124
1125	return 1;
1126}
1127
1128static int nfs_parse_version_string(char *string,
1129		struct nfs_parsed_mount_data *mnt,
1130		substring_t *args)
1131{
1132	mnt->flags &= ~NFS_MOUNT_VER3;
1133	switch (match_token(string, nfs_vers_tokens, args)) {
1134	case Opt_vers_2:
1135		mnt->version = 2;
1136		break;
1137	case Opt_vers_3:
1138		mnt->flags |= NFS_MOUNT_VER3;
1139		mnt->version = 3;
1140		break;
1141	case Opt_vers_4:
1142		/* Backward compatibility option. In future,
1143		 * the mount program should always supply
1144		 * a NFSv4 minor version number.
1145		 */
1146		mnt->version = 4;
1147		break;
1148	case Opt_vers_4_0:
1149		mnt->version = 4;
1150		mnt->minorversion = 0;
1151		break;
1152	case Opt_vers_4_1:
1153		mnt->version = 4;
1154		mnt->minorversion = 1;
1155		break;
1156	case Opt_vers_4_2:
1157		mnt->version = 4;
1158		mnt->minorversion = 2;
1159		break;
1160	default:
1161		return 0;
1162	}
1163	return 1;
1164}
1165
1166static int nfs_get_option_str(substring_t args[], char **option)
1167{
1168	kfree(*option);
1169	*option = match_strdup(args);
1170	return !*option;
1171}
1172
1173static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1174{
1175	int rc;
1176	char *string;
1177
1178	string = match_strdup(args);
1179	if (string == NULL)
1180		return -ENOMEM;
1181	rc = kstrtoul(string, 10, option);
1182	kfree(string);
1183
1184	return rc;
1185}
1186
1187/*
1188 * Error-check and convert a string of mount options from user space into
1189 * a data structure.  The whole mount string is processed; bad options are
1190 * skipped as they are encountered.  If there were no errors, return 1;
1191 * otherwise return 0 (zero).
1192 */
1193static int nfs_parse_mount_options(char *raw,
1194				   struct nfs_parsed_mount_data *mnt)
1195{
1196	char *p, *string, *secdata;
1197	int rc, sloppy = 0, invalid_option = 0;
1198	unsigned short protofamily = AF_UNSPEC;
1199	unsigned short mountfamily = AF_UNSPEC;
1200
1201	if (!raw) {
1202		dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1203		return 1;
1204	}
1205	dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1206
1207	secdata = alloc_secdata();
1208	if (!secdata)
1209		goto out_nomem;
1210
1211	rc = security_sb_copy_data(raw, secdata);
1212	if (rc)
1213		goto out_security_failure;
1214
1215	rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1216	if (rc)
1217		goto out_security_failure;
1218
1219	free_secdata(secdata);
1220
1221	while ((p = strsep(&raw, ",")) != NULL) {
1222		substring_t args[MAX_OPT_ARGS];
1223		unsigned long option;
1224		int token;
1225
1226		if (!*p)
1227			continue;
1228
1229		dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
1230
1231		token = match_token(p, nfs_mount_option_tokens, args);
1232		switch (token) {
1233
1234		/*
1235		 * boolean options:  foo/nofoo
1236		 */
1237		case Opt_soft:
1238			mnt->flags |= NFS_MOUNT_SOFT;
1239			break;
1240		case Opt_hard:
1241			mnt->flags &= ~NFS_MOUNT_SOFT;
1242			break;
1243		case Opt_posix:
1244			mnt->flags |= NFS_MOUNT_POSIX;
1245			break;
1246		case Opt_noposix:
1247			mnt->flags &= ~NFS_MOUNT_POSIX;
1248			break;
1249		case Opt_cto:
1250			mnt->flags &= ~NFS_MOUNT_NOCTO;
1251			break;
1252		case Opt_nocto:
1253			mnt->flags |= NFS_MOUNT_NOCTO;
1254			break;
1255		case Opt_ac:
1256			mnt->flags &= ~NFS_MOUNT_NOAC;
1257			break;
1258		case Opt_noac:
1259			mnt->flags |= NFS_MOUNT_NOAC;
1260			break;
1261		case Opt_lock:
1262			mnt->flags &= ~NFS_MOUNT_NONLM;
1263			mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1264					NFS_MOUNT_LOCAL_FCNTL);
1265			break;
1266		case Opt_nolock:
1267			mnt->flags |= NFS_MOUNT_NONLM;
1268			mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1269				       NFS_MOUNT_LOCAL_FCNTL);
1270			break;
1271		case Opt_udp:
1272			mnt->flags &= ~NFS_MOUNT_TCP;
1273			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1274			break;
1275		case Opt_tcp:
1276			mnt->flags |= NFS_MOUNT_TCP;
1277			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1278			break;
1279		case Opt_rdma:
1280			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1281			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1282			xprt_load_transport(p);
1283			break;
1284		case Opt_acl:
1285			mnt->flags &= ~NFS_MOUNT_NOACL;
1286			break;
1287		case Opt_noacl:
1288			mnt->flags |= NFS_MOUNT_NOACL;
1289			break;
1290		case Opt_rdirplus:
1291			mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1292			break;
1293		case Opt_nordirplus:
1294			mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1295			break;
1296		case Opt_sharecache:
1297			mnt->flags &= ~NFS_MOUNT_UNSHARED;
1298			break;
1299		case Opt_nosharecache:
1300			mnt->flags |= NFS_MOUNT_UNSHARED;
1301			break;
1302		case Opt_resvport:
1303			mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1304			break;
1305		case Opt_noresvport:
1306			mnt->flags |= NFS_MOUNT_NORESVPORT;
1307			break;
1308		case Opt_fscache:
1309			mnt->options |= NFS_OPTION_FSCACHE;
1310			kfree(mnt->fscache_uniq);
1311			mnt->fscache_uniq = NULL;
1312			break;
1313		case Opt_nofscache:
1314			mnt->options &= ~NFS_OPTION_FSCACHE;
1315			kfree(mnt->fscache_uniq);
1316			mnt->fscache_uniq = NULL;
1317			break;
1318		case Opt_migration:
1319			mnt->options |= NFS_OPTION_MIGRATION;
1320			break;
1321		case Opt_nomigration:
1322			mnt->options &= NFS_OPTION_MIGRATION;
1323			break;
1324
1325		/*
1326		 * options that take numeric values
1327		 */
1328		case Opt_port:
1329			if (nfs_get_option_ul(args, &option) ||
1330			    option > USHRT_MAX)
1331				goto out_invalid_value;
1332			mnt->nfs_server.port = option;
1333			break;
1334		case Opt_rsize:
1335			if (nfs_get_option_ul(args, &option))
1336				goto out_invalid_value;
1337			mnt->rsize = option;
1338			break;
1339		case Opt_wsize:
1340			if (nfs_get_option_ul(args, &option))
1341				goto out_invalid_value;
1342			mnt->wsize = option;
1343			break;
1344		case Opt_bsize:
1345			if (nfs_get_option_ul(args, &option))
1346				goto out_invalid_value;
1347			mnt->bsize = option;
1348			break;
1349		case Opt_timeo:
1350			if (nfs_get_option_ul(args, &option) || option == 0)
1351				goto out_invalid_value;
1352			mnt->timeo = option;
1353			break;
1354		case Opt_retrans:
1355			if (nfs_get_option_ul(args, &option) || option == 0)
1356				goto out_invalid_value;
1357			mnt->retrans = option;
1358			break;
1359		case Opt_acregmin:
1360			if (nfs_get_option_ul(args, &option))
1361				goto out_invalid_value;
1362			mnt->acregmin = option;
1363			break;
1364		case Opt_acregmax:
1365			if (nfs_get_option_ul(args, &option))
1366				goto out_invalid_value;
1367			mnt->acregmax = option;
1368			break;
1369		case Opt_acdirmin:
1370			if (nfs_get_option_ul(args, &option))
1371				goto out_invalid_value;
1372			mnt->acdirmin = option;
1373			break;
1374		case Opt_acdirmax:
1375			if (nfs_get_option_ul(args, &option))
1376				goto out_invalid_value;
1377			mnt->acdirmax = option;
1378			break;
1379		case Opt_actimeo:
1380			if (nfs_get_option_ul(args, &option))
1381				goto out_invalid_value;
1382			mnt->acregmin = mnt->acregmax =
1383			mnt->acdirmin = mnt->acdirmax = option;
1384			break;
1385		case Opt_namelen:
1386			if (nfs_get_option_ul(args, &option))
1387				goto out_invalid_value;
1388			mnt->namlen = option;
1389			break;
1390		case Opt_mountport:
1391			if (nfs_get_option_ul(args, &option) ||
1392			    option > USHRT_MAX)
1393				goto out_invalid_value;
1394			mnt->mount_server.port = option;
1395			break;
1396		case Opt_mountvers:
1397			if (nfs_get_option_ul(args, &option) ||
1398			    option < NFS_MNT_VERSION ||
1399			    option > NFS_MNT3_VERSION)
1400				goto out_invalid_value;
1401			mnt->mount_server.version = option;
1402			break;
1403		case Opt_minorversion:
1404			if (nfs_get_option_ul(args, &option))
1405				goto out_invalid_value;
1406			if (option > NFS4_MAX_MINOR_VERSION)
1407				goto out_invalid_value;
1408			mnt->minorversion = option;
1409			break;
1410
1411		/*
1412		 * options that take text values
1413		 */
1414		case Opt_nfsvers:
1415			string = match_strdup(args);
1416			if (string == NULL)
1417				goto out_nomem;
1418			rc = nfs_parse_version_string(string, mnt, args);
1419			kfree(string);
1420			if (!rc)
1421				goto out_invalid_value;
1422			break;
1423		case Opt_sec:
1424			string = match_strdup(args);
1425			if (string == NULL)
1426				goto out_nomem;
1427			rc = nfs_parse_security_flavors(string, mnt);
1428			kfree(string);
1429			if (!rc) {
1430				dfprintk(MOUNT, "NFS:   unrecognized "
1431						"security flavor\n");
1432				return 0;
1433			}
1434			break;
1435		case Opt_proto:
1436			string = match_strdup(args);
1437			if (string == NULL)
1438				goto out_nomem;
1439			token = match_token(string,
1440					    nfs_xprt_protocol_tokens, args);
1441
1442			protofamily = AF_INET;
1443			switch (token) {
1444			case Opt_xprt_udp6:
1445				protofamily = AF_INET6;
1446			case Opt_xprt_udp:
1447				mnt->flags &= ~NFS_MOUNT_TCP;
1448				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1449				break;
1450			case Opt_xprt_tcp6:
1451				protofamily = AF_INET6;
1452			case Opt_xprt_tcp:
1453				mnt->flags |= NFS_MOUNT_TCP;
1454				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1455				break;
1456			case Opt_xprt_rdma:
1457				/* vector side protocols to TCP */
1458				mnt->flags |= NFS_MOUNT_TCP;
1459				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1460				xprt_load_transport(string);
1461				break;
1462			default:
1463				dfprintk(MOUNT, "NFS:   unrecognized "
1464						"transport protocol\n");
1465				kfree(string);
1466				return 0;
1467			}
1468			kfree(string);
1469			break;
1470		case Opt_mountproto:
1471			string = match_strdup(args);
1472			if (string == NULL)
1473				goto out_nomem;
1474			token = match_token(string,
1475					    nfs_xprt_protocol_tokens, args);
1476			kfree(string);
1477
1478			mountfamily = AF_INET;
1479			switch (token) {
1480			case Opt_xprt_udp6:
1481				mountfamily = AF_INET6;
1482			case Opt_xprt_udp:
1483				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1484				break;
1485			case Opt_xprt_tcp6:
1486				mountfamily = AF_INET6;
1487			case Opt_xprt_tcp:
1488				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1489				break;
1490			case Opt_xprt_rdma: /* not used for side protocols */
1491			default:
1492				dfprintk(MOUNT, "NFS:   unrecognized "
1493						"transport protocol\n");
1494				return 0;
1495			}
1496			break;
1497		case Opt_addr:
1498			string = match_strdup(args);
1499			if (string == NULL)
1500				goto out_nomem;
1501			mnt->nfs_server.addrlen =
1502				rpc_pton(mnt->net, string, strlen(string),
1503					(struct sockaddr *)
1504					&mnt->nfs_server.address,
1505					sizeof(mnt->nfs_server.address));
1506			kfree(string);
1507			if (mnt->nfs_server.addrlen == 0)
1508				goto out_invalid_address;
1509			break;
1510		case Opt_clientaddr:
1511			if (nfs_get_option_str(args, &mnt->client_address))
1512				goto out_nomem;
1513			break;
1514		case Opt_mounthost:
1515			if (nfs_get_option_str(args,
1516					       &mnt->mount_server.hostname))
1517				goto out_nomem;
1518			break;
1519		case Opt_mountaddr:
1520			string = match_strdup(args);
1521			if (string == NULL)
1522				goto out_nomem;
1523			mnt->mount_server.addrlen =
1524				rpc_pton(mnt->net, string, strlen(string),
1525					(struct sockaddr *)
1526					&mnt->mount_server.address,
1527					sizeof(mnt->mount_server.address));
1528			kfree(string);
1529			if (mnt->mount_server.addrlen == 0)
1530				goto out_invalid_address;
1531			break;
1532		case Opt_lookupcache:
1533			string = match_strdup(args);
1534			if (string == NULL)
1535				goto out_nomem;
1536			token = match_token(string,
1537					nfs_lookupcache_tokens, args);
1538			kfree(string);
1539			switch (token) {
1540				case Opt_lookupcache_all:
1541					mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1542					break;
1543				case Opt_lookupcache_positive:
1544					mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1545					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1546					break;
1547				case Opt_lookupcache_none:
1548					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1549					break;
1550				default:
1551					dfprintk(MOUNT, "NFS:   invalid "
1552							"lookupcache argument\n");
1553					return 0;
1554			};
1555			break;
1556		case Opt_fscache_uniq:
1557			if (nfs_get_option_str(args, &mnt->fscache_uniq))
1558				goto out_nomem;
1559			mnt->options |= NFS_OPTION_FSCACHE;
1560			break;
1561		case Opt_local_lock:
1562			string = match_strdup(args);
1563			if (string == NULL)
1564				goto out_nomem;
1565			token = match_token(string, nfs_local_lock_tokens,
1566					args);
1567			kfree(string);
1568			switch (token) {
1569			case Opt_local_lock_all:
1570				mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1571					       NFS_MOUNT_LOCAL_FCNTL);
1572				break;
1573			case Opt_local_lock_flock:
1574				mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1575				break;
1576			case Opt_local_lock_posix:
1577				mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1578				break;
1579			case Opt_local_lock_none:
1580				mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1581						NFS_MOUNT_LOCAL_FCNTL);
1582				break;
1583			default:
1584				dfprintk(MOUNT, "NFS:	invalid	"
1585						"local_lock argument\n");
1586				return 0;
1587			};
1588			break;
1589
1590		/*
1591		 * Special options
1592		 */
1593		case Opt_sloppy:
1594			sloppy = 1;
1595			dfprintk(MOUNT, "NFS:   relaxing parsing rules\n");
1596			break;
1597		case Opt_userspace:
1598		case Opt_deprecated:
1599			dfprintk(MOUNT, "NFS:   ignoring mount option "
1600					"'%s'\n", p);
1601			break;
1602
1603		default:
1604			invalid_option = 1;
1605			dfprintk(MOUNT, "NFS:   unrecognized mount option "
1606					"'%s'\n", p);
1607		}
1608	}
1609
1610	if (!sloppy && invalid_option)
1611		return 0;
1612
1613	if (mnt->minorversion && mnt->version != 4)
1614		goto out_minorversion_mismatch;
1615
1616	if (mnt->options & NFS_OPTION_MIGRATION &&
1617	    (mnt->version != 4 || mnt->minorversion != 0))
1618		goto out_migration_misuse;
1619
1620	/*
1621	 * verify that any proto=/mountproto= options match the address
1622	 * families in the addr=/mountaddr= options.
1623	 */
1624	if (protofamily != AF_UNSPEC &&
1625	    protofamily != mnt->nfs_server.address.ss_family)
1626		goto out_proto_mismatch;
1627
1628	if (mountfamily != AF_UNSPEC) {
1629		if (mnt->mount_server.addrlen) {
1630			if (mountfamily != mnt->mount_server.address.ss_family)
1631				goto out_mountproto_mismatch;
1632		} else {
1633			if (mountfamily != mnt->nfs_server.address.ss_family)
1634				goto out_mountproto_mismatch;
1635		}
1636	}
1637
1638	return 1;
1639
1640out_mountproto_mismatch:
1641	printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1642			 "option\n");
1643	return 0;
1644out_proto_mismatch:
1645	printk(KERN_INFO "NFS: server address does not match proto= option\n");
1646	return 0;
1647out_invalid_address:
1648	printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1649	return 0;
1650out_invalid_value:
1651	printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1652	return 0;
1653out_minorversion_mismatch:
1654	printk(KERN_INFO "NFS: mount option vers=%u does not support "
1655			 "minorversion=%u\n", mnt->version, mnt->minorversion);
1656	return 0;
1657out_migration_misuse:
1658	printk(KERN_INFO
1659		"NFS: 'migration' not supported for this NFS version\n");
1660	return 0;
1661out_nomem:
1662	printk(KERN_INFO "NFS: not enough memory to parse option\n");
1663	return 0;
1664out_security_failure:
1665	free_secdata(secdata);
1666	printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1667	return 0;
1668}
1669
1670/*
1671 * Ensure that a specified authtype in args->auth_info is supported by
1672 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1673 * -EACCES if not.
1674 */
1675static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1676			rpc_authflavor_t *server_authlist, unsigned int count)
 
1677{
1678	rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
 
1679	unsigned int i;
1680
1681	/*
1682	 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1683	 * must be in the list returned by the server.
1684	 *
1685	 * AUTH_NULL has a special meaning when it's in the server list - it
1686	 * means that the server will ignore the rpc creds, so any flavor
1687	 * can be used.
 
 
 
 
1688	 */
1689	for (i = 0; i < count; i++) {
1690		flavor = server_authlist[i];
1691
1692		if (nfs_auth_info_match(&args->auth_info, flavor) ||
1693		    flavor == RPC_AUTH_NULL)
1694			goto out;
 
 
 
 
 
 
 
 
1695	}
1696
1697	dfprintk(MOUNT,
1698		 "NFS: specified auth flavors not supported by server\n");
1699	return -EACCES;
1700
1701out:
1702	args->selected_flavor = flavor;
1703	dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1704	return 0;
1705}
1706
1707/*
1708 * Use the remote server's MOUNT service to request the NFS file handle
1709 * corresponding to the provided path.
1710 */
1711static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1712			     struct nfs_fh *root_fh,
1713			     rpc_authflavor_t *server_authlist,
1714			     unsigned int *server_authlist_len)
1715{
 
1716	struct nfs_mount_request request = {
1717		.sap		= (struct sockaddr *)
1718						&args->mount_server.address,
1719		.dirpath	= args->nfs_server.export_path,
1720		.protocol	= args->mount_server.protocol,
1721		.fh		= root_fh,
1722		.noresvport	= args->flags & NFS_MOUNT_NORESVPORT,
1723		.auth_flav_len	= server_authlist_len,
1724		.auth_flavs	= server_authlist,
1725		.net		= args->net,
1726	};
1727	int status;
1728
1729	if (args->mount_server.version == 0) {
1730		switch (args->version) {
1731			default:
1732				args->mount_server.version = NFS_MNT3_VERSION;
1733				break;
1734			case 2:
1735				args->mount_server.version = NFS_MNT_VERSION;
1736		}
1737	}
1738	request.version = args->mount_server.version;
1739
1740	if (args->mount_server.hostname)
1741		request.hostname = args->mount_server.hostname;
1742	else
1743		request.hostname = args->nfs_server.hostname;
1744
1745	/*
1746	 * Construct the mount server's address.
1747	 */
1748	if (args->mount_server.address.ss_family == AF_UNSPEC) {
1749		memcpy(request.sap, &args->nfs_server.address,
1750		       args->nfs_server.addrlen);
1751		args->mount_server.addrlen = args->nfs_server.addrlen;
1752	}
1753	request.salen = args->mount_server.addrlen;
1754	nfs_set_port(request.sap, &args->mount_server.port, 0);
1755
1756	/*
1757	 * Now ask the mount server to map our export path
1758	 * to a file handle.
1759	 */
1760	status = nfs_mount(&request);
1761	if (status != 0) {
1762		dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1763				request.hostname, status);
1764		return status;
1765	}
1766
1767	return 0;
1768}
1769
1770static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1771					struct nfs_subversion *nfs_mod)
1772{
 
1773	int status;
1774	unsigned int i;
1775	bool tried_auth_unix = false;
1776	bool auth_null_in_list = false;
1777	struct nfs_server *server = ERR_PTR(-EACCES);
1778	struct nfs_parsed_mount_data *args = mount_info->parsed;
1779	rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1780	unsigned int authlist_len = ARRAY_SIZE(authlist);
1781
1782	status = nfs_request_mount(args, mount_info->mntfh, authlist,
1783					&authlist_len);
1784	if (status)
1785		return ERR_PTR(status);
1786
1787	/*
1788	 * Was a sec= authflavor specified in the options? First, verify
1789	 * whether the server supports it, and then just try to use it if so.
1790	 */
1791	if (args->auth_info.flavor_len > 0) {
1792		status = nfs_verify_authflavors(args, authlist, authlist_len);
1793		dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1794			 args->selected_flavor);
1795		if (status)
1796			return ERR_PTR(status);
1797		return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1798	}
1799
1800	/*
1801	 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1802	 * SHOULD prefer the flavor listed first. However, some servers list
1803	 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1804	 */
1805	for (i = 0; i < authlist_len; ++i) {
1806		rpc_authflavor_t flavor;
1807		struct rpcsec_gss_info info;
1808
1809		flavor = authlist[i];
1810		switch (flavor) {
1811		case RPC_AUTH_UNIX:
1812			tried_auth_unix = true;
1813			break;
1814		case RPC_AUTH_NULL:
1815			auth_null_in_list = true;
1816			continue;
1817		default:
1818			if (rpcauth_get_gssinfo(flavor, &info) != 0)
1819				continue;
1820			/* Fallthrough */
1821		}
1822		dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1823		args->selected_flavor = flavor;
1824		server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1825		if (!IS_ERR(server))
1826			return server;
1827	}
1828
1829	/*
1830	 * Nothing we tried so far worked. At this point, give up if we've
1831	 * already tried AUTH_UNIX or if the server's list doesn't contain
1832	 * AUTH_NULL
1833	 */
1834	if (tried_auth_unix || !auth_null_in_list)
1835		return server;
1836
1837	/* Last chance! Try AUTH_UNIX */
1838	dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1839	args->selected_flavor = RPC_AUTH_UNIX;
1840	return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1841}
1842
1843struct dentry *nfs_try_mount(int flags, const char *dev_name,
1844			     struct nfs_mount_info *mount_info,
1845			     struct nfs_subversion *nfs_mod)
1846{
1847	struct nfs_server *server;
1848
1849	if (mount_info->parsed->need_mount)
1850		server = nfs_try_mount_request(mount_info, nfs_mod);
1851	else
1852		server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1853
1854	if (IS_ERR(server))
1855		return ERR_CAST(server);
1856
1857	return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1858}
1859EXPORT_SYMBOL_GPL(nfs_try_mount);
1860
1861/*
1862 * Split "dev_name" into "hostname:export_path".
1863 *
1864 * The leftmost colon demarks the split between the server's hostname
1865 * and the export path.  If the hostname starts with a left square
1866 * bracket, then it may contain colons.
1867 *
1868 * Note: caller frees hostname and export path, even on error.
1869 */
1870static int nfs_parse_devname(const char *dev_name,
1871			     char **hostname, size_t maxnamlen,
1872			     char **export_path, size_t maxpathlen)
1873{
1874	size_t len;
1875	char *end;
1876
1877	/* Is the host name protected with square brakcets? */
1878	if (*dev_name == '[') {
1879		end = strchr(++dev_name, ']');
1880		if (end == NULL || end[1] != ':')
1881			goto out_bad_devname;
1882
1883		len = end - dev_name;
1884		end++;
1885	} else {
1886		char *comma;
1887
1888		end = strchr(dev_name, ':');
1889		if (end == NULL)
1890			goto out_bad_devname;
1891		len = end - dev_name;
1892
1893		/* kill possible hostname list: not supported */
1894		comma = strchr(dev_name, ',');
1895		if (comma != NULL && comma < end)
1896			*comma = 0;
1897	}
1898
1899	if (len > maxnamlen)
1900		goto out_hostname;
1901
1902	/* N.B. caller will free nfs_server.hostname in all cases */
1903	*hostname = kstrndup(dev_name, len, GFP_KERNEL);
1904	if (*hostname == NULL)
1905		goto out_nomem;
1906	len = strlen(++end);
1907	if (len > maxpathlen)
1908		goto out_path;
1909	*export_path = kstrndup(end, len, GFP_KERNEL);
1910	if (!*export_path)
1911		goto out_nomem;
1912
1913	dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1914	return 0;
1915
1916out_bad_devname:
1917	dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1918	return -EINVAL;
1919
1920out_nomem:
1921	dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1922	return -ENOMEM;
1923
1924out_hostname:
1925	dfprintk(MOUNT, "NFS: server hostname too long\n");
1926	return -ENAMETOOLONG;
1927
1928out_path:
1929	dfprintk(MOUNT, "NFS: export pathname too long\n");
1930	return -ENAMETOOLONG;
1931}
1932
1933/*
1934 * Validate the NFS2/NFS3 mount data
1935 * - fills in the mount root filehandle
1936 *
1937 * For option strings, user space handles the following behaviors:
1938 *
1939 * + DNS: mapping server host name to IP address ("addr=" option)
1940 *
1941 * + failure mode: how to behave if a mount request can't be handled
1942 *   immediately ("fg/bg" option)
1943 *
1944 * + retry: how often to retry a mount request ("retry=" option)
1945 *
1946 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1947 *   mountproto=tcp after mountproto=udp, and so on
1948 */
1949static int nfs23_validate_mount_data(void *options,
1950				     struct nfs_parsed_mount_data *args,
1951				     struct nfs_fh *mntfh,
1952				     const char *dev_name)
1953{
1954	struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1955	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1956	int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1957
1958	if (data == NULL)
1959		goto out_no_data;
1960
1961	args->version = NFS_DEFAULT_VERSION;
1962	switch (data->version) {
1963	case 1:
1964		data->namlen = 0;
1965	case 2:
1966		data->bsize = 0;
1967	case 3:
1968		if (data->flags & NFS_MOUNT_VER3)
1969			goto out_no_v3;
1970		data->root.size = NFS2_FHSIZE;
1971		memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1972		/* Turn off security negotiation */
1973		extra_flags |= NFS_MOUNT_SECFLAVOUR;
1974	case 4:
1975		if (data->flags & NFS_MOUNT_SECFLAVOUR)
1976			goto out_no_sec;
1977	case 5:
1978		memset(data->context, 0, sizeof(data->context));
1979	case 6:
1980		if (data->flags & NFS_MOUNT_VER3) {
1981			if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1982				goto out_invalid_fh;
1983			mntfh->size = data->root.size;
1984			args->version = 3;
1985		} else {
1986			mntfh->size = NFS2_FHSIZE;
1987			args->version = 2;
1988		}
1989
1990
1991		memcpy(mntfh->data, data->root.data, mntfh->size);
1992		if (mntfh->size < sizeof(mntfh->data))
1993			memset(mntfh->data + mntfh->size, 0,
1994			       sizeof(mntfh->data) - mntfh->size);
1995
1996		/*
1997		 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1998		 * can deal with.
1999		 */
2000		args->flags		= data->flags & NFS_MOUNT_FLAGMASK;
2001		args->flags		|= extra_flags;
2002		args->rsize		= data->rsize;
2003		args->wsize		= data->wsize;
2004		args->timeo		= data->timeo;
2005		args->retrans		= data->retrans;
2006		args->acregmin		= data->acregmin;
2007		args->acregmax		= data->acregmax;
2008		args->acdirmin		= data->acdirmin;
2009		args->acdirmax		= data->acdirmax;
2010		args->need_mount	= false;
2011
2012		memcpy(sap, &data->addr, sizeof(data->addr));
2013		args->nfs_server.addrlen = sizeof(data->addr);
2014		args->nfs_server.port = ntohs(data->addr.sin_port);
2015		if (!nfs_verify_server_address(sap))
2016			goto out_no_address;
2017
2018		if (!(data->flags & NFS_MOUNT_TCP))
2019			args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2020		/* N.B. caller will free nfs_server.hostname in all cases */
2021		args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2022		args->namlen		= data->namlen;
2023		args->bsize		= data->bsize;
2024
2025		if (data->flags & NFS_MOUNT_SECFLAVOUR)
2026			args->selected_flavor = data->pseudoflavor;
2027		else
2028			args->selected_flavor = RPC_AUTH_UNIX;
2029		if (!args->nfs_server.hostname)
2030			goto out_nomem;
2031
2032		if (!(data->flags & NFS_MOUNT_NONLM))
2033			args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2034					 NFS_MOUNT_LOCAL_FCNTL);
2035		else
2036			args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2037					NFS_MOUNT_LOCAL_FCNTL);
2038		/*
2039		 * The legacy version 6 binary mount data from userspace has a
2040		 * field used only to transport selinux information into the
2041		 * the kernel.  To continue to support that functionality we
2042		 * have a touch of selinux knowledge here in the NFS code. The
2043		 * userspace code converted context=blah to just blah so we are
2044		 * converting back to the full string selinux understands.
2045		 */
2046		if (data->context[0]){
2047#ifdef CONFIG_SECURITY_SELINUX
2048			int rc;
2049			char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2050			if (!opts_str)
2051				return -ENOMEM;
2052			strcpy(opts_str, "context=");
2053			data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2054			strcat(opts_str, &data->context[0]);
2055			rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2056			kfree(opts_str);
2057			if (rc)
2058				return rc;
2059#else
2060			return -EINVAL;
2061#endif
2062		}
2063
2064		break;
2065	default:
2066		return NFS_TEXT_DATA;
2067	}
2068
2069#if !IS_ENABLED(CONFIG_NFS_V3)
2070	if (args->version == 3)
2071		goto out_v3_not_compiled;
2072#endif /* !CONFIG_NFS_V3 */
2073
2074	return 0;
2075
2076out_no_data:
2077	dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2078	return -EINVAL;
2079
2080out_no_v3:
2081	dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2082		 data->version);
2083	return -EINVAL;
2084
2085out_no_sec:
2086	dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2087	return -EINVAL;
2088
2089#if !IS_ENABLED(CONFIG_NFS_V3)
2090out_v3_not_compiled:
2091	dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2092	return -EPROTONOSUPPORT;
2093#endif /* !CONFIG_NFS_V3 */
2094
2095out_nomem:
2096	dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2097	return -ENOMEM;
2098
2099out_no_address:
2100	dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2101	return -EINVAL;
2102
2103out_invalid_fh:
2104	dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2105	return -EINVAL;
2106}
2107
2108#if IS_ENABLED(CONFIG_NFS_V4)
2109static int nfs_validate_mount_data(struct file_system_type *fs_type,
2110				   void *options,
2111				   struct nfs_parsed_mount_data *args,
2112				   struct nfs_fh *mntfh,
2113				   const char *dev_name)
2114{
2115	if (fs_type == &nfs_fs_type)
2116		return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2117	return nfs4_validate_mount_data(options, args, dev_name);
2118}
2119#else
2120static int nfs_validate_mount_data(struct file_system_type *fs_type,
2121				   void *options,
2122				   struct nfs_parsed_mount_data *args,
2123				   struct nfs_fh *mntfh,
2124				   const char *dev_name)
2125{
2126	return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2127}
2128#endif
2129
2130static int nfs_validate_text_mount_data(void *options,
2131					struct nfs_parsed_mount_data *args,
2132					const char *dev_name)
2133{
2134	int port = 0;
2135	int max_namelen = PAGE_SIZE;
2136	int max_pathlen = NFS_MAXPATHLEN;
2137	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2138
2139	if (nfs_parse_mount_options((char *)options, args) == 0)
2140		return -EINVAL;
2141
2142	if (!nfs_verify_server_address(sap))
2143		goto out_no_address;
2144
2145	if (args->version == 4) {
2146#if IS_ENABLED(CONFIG_NFS_V4)
2147		port = NFS_PORT;
2148		max_namelen = NFS4_MAXNAMLEN;
2149		max_pathlen = NFS4_MAXPATHLEN;
2150		nfs_validate_transport_protocol(args);
2151		if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2152			goto out_invalid_transport_udp;
2153		nfs4_validate_mount_flags(args);
2154#else
2155		goto out_v4_not_compiled;
2156#endif /* CONFIG_NFS_V4 */
2157	} else
2158		nfs_set_mount_transport_protocol(args);
2159
2160	nfs_set_port(sap, &args->nfs_server.port, port);
2161
2162	return nfs_parse_devname(dev_name,
2163				   &args->nfs_server.hostname,
2164				   max_namelen,
2165				   &args->nfs_server.export_path,
2166				   max_pathlen);
2167
2168#if !IS_ENABLED(CONFIG_NFS_V4)
2169out_v4_not_compiled:
2170	dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2171	return -EPROTONOSUPPORT;
2172#else
2173out_invalid_transport_udp:
2174	dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2175	return -EINVAL;
2176#endif /* !CONFIG_NFS_V4 */
2177
2178out_no_address:
2179	dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2180	return -EINVAL;
2181}
2182
2183static int
2184nfs_compare_remount_data(struct nfs_server *nfss,
2185			 struct nfs_parsed_mount_data *data)
2186{
2187	if (data->flags != nfss->flags ||
2188	    data->rsize != nfss->rsize ||
2189	    data->wsize != nfss->wsize ||
2190	    data->version != nfss->nfs_client->rpc_ops->version ||
2191	    data->minorversion != nfss->nfs_client->cl_minorversion ||
2192	    data->retrans != nfss->client->cl_timeout->to_retries ||
2193	    data->selected_flavor != nfss->client->cl_auth->au_flavor ||
2194	    data->acregmin != nfss->acregmin / HZ ||
2195	    data->acregmax != nfss->acregmax / HZ ||
2196	    data->acdirmin != nfss->acdirmin / HZ ||
2197	    data->acdirmax != nfss->acdirmax / HZ ||
2198	    data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2199	    data->nfs_server.port != nfss->port ||
2200	    data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2201	    !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
 
2202			  (struct sockaddr *)&nfss->nfs_client->cl_addr))
2203		return -EINVAL;
2204
2205	return 0;
2206}
2207
2208int
2209nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2210{
2211	int error;
 
2212	struct nfs_server *nfss = sb->s_fs_info;
2213	struct nfs_parsed_mount_data *data;
2214	struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2215	struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2216	u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2217
2218	sync_filesystem(sb);
2219
2220	/*
2221	 * Userspace mount programs that send binary options generally send
2222	 * them populated with default values. We have no way to know which
2223	 * ones were explicitly specified. Fall back to legacy behavior and
2224	 * just return success.
2225	 */
2226	if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2227	    (nfsvers <= 3 && (!options || (options->version >= 1 &&
2228					   options->version <= 6))))
2229		return 0;
2230
2231	data = kzalloc(sizeof(*data), GFP_KERNEL);
2232	if (data == NULL)
2233		return -ENOMEM;
2234
2235	/* fill out struct with values from existing mount */
2236	data->flags = nfss->flags;
2237	data->rsize = nfss->rsize;
2238	data->wsize = nfss->wsize;
2239	data->retrans = nfss->client->cl_timeout->to_retries;
2240	data->selected_flavor = nfss->client->cl_auth->au_flavor;
2241	data->auth_info = nfss->auth_info;
2242	data->acregmin = nfss->acregmin / HZ;
2243	data->acregmax = nfss->acregmax / HZ;
2244	data->acdirmin = nfss->acdirmin / HZ;
2245	data->acdirmax = nfss->acdirmax / HZ;
2246	data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2247	data->nfs_server.port = nfss->port;
2248	data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2249	data->version = nfsvers;
2250	data->minorversion = nfss->nfs_client->cl_minorversion;
2251	memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2252		data->nfs_server.addrlen);
2253
2254	/* overwrite those values with any that were specified */
2255	error = -EINVAL;
2256	if (!nfs_parse_mount_options((char *)options, data))
2257		goto out;
2258
2259	/*
2260	 * noac is a special case. It implies -o sync, but that's not
2261	 * necessarily reflected in the mtab options. do_remount_sb
2262	 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2263	 * remount options, so we have to explicitly reset it.
2264	 */
2265	if (data->flags & NFS_MOUNT_NOAC)
2266		*flags |= MS_SYNCHRONOUS;
 
 
2267
2268	/* compare new mount options with old ones */
2269	error = nfs_compare_remount_data(nfss, data);
2270out:
2271	kfree(data);
2272	return error;
2273}
2274EXPORT_SYMBOL_GPL(nfs_remount);
2275
2276/*
2277 * Initialise the common bits of the superblock
2278 */
2279inline void nfs_initialise_sb(struct super_block *sb)
2280{
2281	struct nfs_server *server = NFS_SB(sb);
2282
2283	sb->s_magic = NFS_SUPER_MAGIC;
2284
2285	/* We probably want something more informative here */
2286	snprintf(sb->s_id, sizeof(sb->s_id),
2287		 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2288
2289	if (sb->s_blocksize == 0)
2290		sb->s_blocksize = nfs_block_bits(server->wsize,
2291						 &sb->s_blocksize_bits);
2292
2293	sb->s_bdi = &server->backing_dev_info;
2294
2295	nfs_super_set_maxbytes(sb, server->maxfilesize);
2296}
 
2297
2298/*
2299 * Finish setting up an NFS2/3 superblock
2300 */
2301void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2302{
2303	struct nfs_parsed_mount_data *data = mount_info->parsed;
2304	struct nfs_server *server = NFS_SB(sb);
2305
2306	sb->s_blocksize_bits = 0;
2307	sb->s_blocksize = 0;
2308	sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2309	sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2310	if (data && data->bsize)
2311		sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2312
2313	if (server->nfs_client->rpc_ops->version != 2) {
2314		/* The VFS shouldn't apply the umask to mode bits. We will do
2315		 * so ourselves when necessary.
2316		 */
2317		sb->s_flags |= MS_POSIXACL;
2318		sb->s_time_gran = 1;
2319	}
 
 
2320
2321 	nfs_initialise_sb(sb);
2322}
2323EXPORT_SYMBOL_GPL(nfs_fill_super);
 
 
 
 
2324
2325/*
2326 * Finish setting up a cloned NFS2/3/4 superblock
2327 */
2328void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2329{
2330	const struct super_block *old_sb = mount_info->cloned->sb;
2331	struct nfs_server *server = NFS_SB(sb);
2332
2333	sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2334	sb->s_blocksize = old_sb->s_blocksize;
2335	sb->s_maxbytes = old_sb->s_maxbytes;
2336	sb->s_xattr = old_sb->s_xattr;
2337	sb->s_op = old_sb->s_op;
2338	sb->s_time_gran = 1;
2339
2340	if (server->nfs_client->rpc_ops->version != 2) {
2341		/* The VFS shouldn't apply the umask to mode bits. We will do
2342		 * so ourselves when necessary.
2343		 */
2344		sb->s_flags |= MS_POSIXACL;
2345	}
2346
2347 	nfs_initialise_sb(sb);
 
2348}
2349
2350#define NFS_MOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2351		| NFS_MOUNT_SECURE \
2352		| NFS_MOUNT_TCP \
2353		| NFS_MOUNT_VER3 \
2354		| NFS_MOUNT_KERBEROS \
2355		| NFS_MOUNT_NONLM \
2356		| NFS_MOUNT_BROKEN_SUID \
2357		| NFS_MOUNT_STRICTLOCK \
2358		| NFS_MOUNT_UNSHARED \
2359		| NFS_MOUNT_NORESVPORT \
2360		| NFS_MOUNT_LEGACY_INTERFACE)
2361
2362static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2363{
2364	const struct nfs_server *a = s->s_fs_info;
2365	const struct rpc_clnt *clnt_a = a->client;
2366	const struct rpc_clnt *clnt_b = b->client;
2367
2368	if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2369		goto Ebusy;
2370	if (a->nfs_client != b->nfs_client)
2371		goto Ebusy;
2372	if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2373		goto Ebusy;
2374	if (a->wsize != b->wsize)
2375		goto Ebusy;
2376	if (a->rsize != b->rsize)
2377		goto Ebusy;
2378	if (a->acregmin != b->acregmin)
2379		goto Ebusy;
2380	if (a->acregmax != b->acregmax)
2381		goto Ebusy;
2382	if (a->acdirmin != b->acdirmin)
2383		goto Ebusy;
2384	if (a->acdirmax != b->acdirmax)
2385		goto Ebusy;
2386	if (b->auth_info.flavor_len > 0 &&
2387	   clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2388		goto Ebusy;
2389	return 1;
2390Ebusy:
2391	return 0;
2392}
2393
2394struct nfs_sb_mountdata {
2395	struct nfs_server *server;
2396	int mntflags;
2397};
2398
2399static int nfs_set_super(struct super_block *s, void *data)
2400{
2401	struct nfs_sb_mountdata *sb_mntdata = data;
2402	struct nfs_server *server = sb_mntdata->server;
2403	int ret;
2404
2405	s->s_flags = sb_mntdata->mntflags;
2406	s->s_fs_info = server;
2407	s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2408	ret = set_anon_super(s, server);
2409	if (ret == 0)
2410		server->s_dev = s->s_dev;
2411	return ret;
2412}
2413
2414static int nfs_compare_super_address(struct nfs_server *server1,
2415				     struct nfs_server *server2)
2416{
2417	struct sockaddr *sap1, *sap2;
 
 
 
 
 
2418
2419	sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2420	sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2421
2422	if (sap1->sa_family != sap2->sa_family)
2423		return 0;
2424
2425	switch (sap1->sa_family) {
2426	case AF_INET: {
2427		struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2428		struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2429		if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2430			return 0;
2431		if (sin1->sin_port != sin2->sin_port)
2432			return 0;
2433		break;
2434	}
2435	case AF_INET6: {
2436		struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2437		struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2438		if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2439			return 0;
2440		if (sin1->sin6_port != sin2->sin6_port)
2441			return 0;
2442		break;
2443	}
2444	default:
2445		return 0;
2446	}
2447
2448	return 1;
2449}
2450
2451static int nfs_compare_super(struct super_block *sb, void *data)
 
2452{
2453	struct nfs_sb_mountdata *sb_mntdata = data;
2454	struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2455	int mntflags = sb_mntdata->mntflags;
 
 
 
 
 
 
 
 
 
 
 
 
2456
2457	if (!nfs_compare_super_address(old, server))
2458		return 0;
2459	/* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2460	if (old->flags & NFS_MOUNT_UNSHARED)
2461		return 0;
2462	if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2463		return 0;
2464	return nfs_compare_mount_options(sb, server, mntflags);
 
 
 
 
 
2465}
2466
2467#ifdef CONFIG_NFS_FSCACHE
2468static void nfs_get_cache_cookie(struct super_block *sb,
2469				 struct nfs_parsed_mount_data *parsed,
2470				 struct nfs_clone_mount *cloned)
2471{
2472	struct nfs_server *nfss = NFS_SB(sb);
2473	char *uniq = NULL;
2474	int ulen = 0;
2475
2476	nfss->fscache_key = NULL;
2477	nfss->fscache = NULL;
2478
2479	if (parsed) {
2480		if (!(parsed->options & NFS_OPTION_FSCACHE))
2481			return;
2482		if (parsed->fscache_uniq) {
2483			uniq = parsed->fscache_uniq;
2484			ulen = strlen(parsed->fscache_uniq);
2485		}
2486	} else if (cloned) {
2487		struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2488		if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2489			return;
2490		if (mnt_s->fscache_key) {
2491			uniq = mnt_s->fscache_key->key.uniquifier;
2492			ulen = mnt_s->fscache_key->key.uniq_len;
2493		};
2494	} else
2495		return;
 
 
 
 
 
 
2496
2497	nfs_fscache_get_super_cookie(sb, uniq, ulen);
2498}
2499#else
2500static void nfs_get_cache_cookie(struct super_block *sb,
2501				 struct nfs_parsed_mount_data *parsed,
2502				 struct nfs_clone_mount *cloned)
2503{
2504}
2505#endif
2506
2507static int nfs_bdi_register(struct nfs_server *server)
2508{
2509	return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2510}
2511
2512int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2513			struct nfs_mount_info *mount_info)
2514{
2515	int error;
2516	unsigned long kflags = 0, kflags_out = 0;
2517	if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2518		kflags |= SECURITY_LSM_NATIVE_LABELS;
2519
2520	error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2521						kflags, &kflags_out);
2522	if (error)
2523		goto err;
2524
2525	if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2526		!(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2527		NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2528err:
2529	return error;
2530}
2531EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2532
2533int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2534			  struct nfs_mount_info *mount_info)
2535{
2536	/* clone any lsm security options from the parent to the new sb */
2537	if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2538		return -ESTALE;
2539	return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2540}
2541EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2542
2543struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2544				   int flags, const char *dev_name,
2545				   struct nfs_mount_info *mount_info,
2546				   struct nfs_subversion *nfs_mod)
2547{
 
2548	struct super_block *s;
2549	struct dentry *mntroot = ERR_PTR(-ENOMEM);
2550	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2551	struct nfs_sb_mountdata sb_mntdata = {
2552		.mntflags = flags,
2553		.server = server,
2554	};
2555	int error;
2556
 
 
 
 
2557	if (server->flags & NFS_MOUNT_UNSHARED)
2558		compare_super = NULL;
2559
2560	/* -o noac implies -o sync */
2561	if (server->flags & NFS_MOUNT_NOAC)
2562		sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2563
2564	if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2565		if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2566			sb_mntdata.mntflags |= MS_SYNCHRONOUS;
 
 
 
2567
2568	/* Get a superblock - note that we may end up sharing one that already exists */
2569	s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
 
 
2570	if (IS_ERR(s)) {
2571		mntroot = ERR_CAST(s);
 
2572		goto out_err_nosb;
2573	}
2574
2575	if (s->s_fs_info != server) {
2576		nfs_free_server(server);
2577		server = NULL;
2578	} else {
2579		error = nfs_bdi_register(server);
2580		if (error) {
2581			mntroot = ERR_PTR(error);
2582			goto error_splat_bdi;
2583		}
2584		server->super = s;
2585	}
2586
2587	if (!s->s_root) {
 
2588		/* initial superblock/root creation */
2589		mount_info->fill_super(s, mount_info);
2590		nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
 
 
 
 
2591	}
2592
2593	mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2594	if (IS_ERR(mntroot))
 
2595		goto error_splat_super;
 
2596
2597	error = mount_info->set_security(s, mntroot, mount_info);
2598	if (error)
2599		goto error_splat_root;
2600
2601	s->s_flags |= MS_ACTIVE;
2602
2603out:
2604	return mntroot;
2605
2606out_err_nosb:
2607	nfs_free_server(server);
2608	goto out;
2609
2610error_splat_root:
2611	dput(mntroot);
2612	mntroot = ERR_PTR(error);
2613error_splat_super:
2614	if (server && !s->s_root)
2615		bdi_unregister(&server->backing_dev_info);
2616error_splat_bdi:
2617	deactivate_locked_super(s);
2618	goto out;
2619}
2620EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2621
2622struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2623	int flags, const char *dev_name, void *raw_data)
2624{
2625	struct nfs_mount_info mount_info = {
2626		.fill_super = nfs_fill_super,
2627		.set_security = nfs_set_sb_security,
2628	};
2629	struct dentry *mntroot = ERR_PTR(-ENOMEM);
2630	struct nfs_subversion *nfs_mod;
2631	int error;
2632
2633	mount_info.parsed = nfs_alloc_parsed_mount_data();
2634	mount_info.mntfh = nfs_alloc_fhandle();
2635	if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2636		goto out;
2637
2638	/* Validate the mount data */
2639	error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2640	if (error == NFS_TEXT_DATA)
2641		error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2642	if (error < 0) {
2643		mntroot = ERR_PTR(error);
2644		goto out;
2645	}
2646
2647	nfs_mod = get_nfs_version(mount_info.parsed->version);
2648	if (IS_ERR(nfs_mod)) {
2649		mntroot = ERR_CAST(nfs_mod);
2650		goto out;
2651	}
2652
2653	mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2654
2655	put_nfs_version(nfs_mod);
2656out:
2657	nfs_free_parsed_mount_data(mount_info.parsed);
2658	nfs_free_fhandle(mount_info.mntfh);
2659	return mntroot;
2660}
2661EXPORT_SYMBOL_GPL(nfs_fs_mount);
2662
2663/*
2664 * Ensure that we unregister the bdi before kill_anon_super
2665 * releases the device name
2666 */
2667void nfs_put_super(struct super_block *s)
2668{
2669	struct nfs_server *server = NFS_SB(s);
2670
2671	bdi_unregister(&server->backing_dev_info);
2672}
2673EXPORT_SYMBOL_GPL(nfs_put_super);
2674
2675/*
2676 * Destroy an NFS2/3 superblock
2677 */
2678void nfs_kill_super(struct super_block *s)
2679{
2680	struct nfs_server *server = NFS_SB(s);
 
 
 
2681
2682	kill_anon_super(s);
2683	nfs_fscache_release_super_cookie(s);
 
2684	nfs_free_server(server);
 
2685}
2686EXPORT_SYMBOL_GPL(nfs_kill_super);
2687
2688/*
2689 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2690 */
2691static struct dentry *
2692nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2693		const char *dev_name, void *raw_data)
2694{
2695	struct nfs_clone_mount *data = raw_data;
2696	struct nfs_mount_info mount_info = {
2697		.fill_super = nfs_clone_super,
2698		.set_security = nfs_clone_sb_security,
2699		.cloned = data,
2700	};
2701	struct nfs_server *server;
2702	struct dentry *mntroot = ERR_PTR(-ENOMEM);
2703	struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2704
2705	dprintk("--> nfs_xdev_mount()\n");
2706
2707	mount_info.mntfh = mount_info.cloned->fh;
2708
2709	/* create a new volume representation */
2710	server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2711
2712	if (IS_ERR(server))
2713		mntroot = ERR_CAST(server);
2714	else
2715		mntroot = nfs_fs_mount_common(server, flags,
2716				dev_name, &mount_info, nfs_mod);
2717
2718	dprintk("<-- nfs_xdev_mount() = %ld\n",
2719			IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2720	return mntroot;
2721}
2722
2723#if IS_ENABLED(CONFIG_NFS_V4)
2724
2725static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2726{
2727	args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2728			 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2729}
2730
2731/*
2732 * Validate NFSv4 mount options
2733 */
2734static int nfs4_validate_mount_data(void *options,
2735				    struct nfs_parsed_mount_data *args,
2736				    const char *dev_name)
2737{
2738	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2739	struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2740	char *c;
2741
2742	if (data == NULL)
2743		goto out_no_data;
2744
2745	args->version = 4;
2746
2747	switch (data->version) {
2748	case 1:
2749		if (data->host_addrlen > sizeof(args->nfs_server.address))
2750			goto out_no_address;
2751		if (data->host_addrlen == 0)
2752			goto out_no_address;
2753		args->nfs_server.addrlen = data->host_addrlen;
2754		if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2755			return -EFAULT;
2756		if (!nfs_verify_server_address(sap))
2757			goto out_no_address;
2758		args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2759
2760		if (data->auth_flavourlen) {
2761			rpc_authflavor_t pseudoflavor;
2762			if (data->auth_flavourlen > 1)
2763				goto out_inval_auth;
2764			if (copy_from_user(&pseudoflavor,
2765					   data->auth_flavours,
2766					   sizeof(pseudoflavor)))
2767				return -EFAULT;
2768			args->selected_flavor = pseudoflavor;
2769		} else
2770			args->selected_flavor = RPC_AUTH_UNIX;
2771
2772		c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2773		if (IS_ERR(c))
2774			return PTR_ERR(c);
2775		args->nfs_server.hostname = c;
2776
2777		c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2778		if (IS_ERR(c))
2779			return PTR_ERR(c);
2780		args->nfs_server.export_path = c;
2781		dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2782
2783		c = strndup_user(data->client_addr.data, 16);
2784		if (IS_ERR(c))
2785			return PTR_ERR(c);
2786		args->client_address = c;
2787
2788		/*
2789		 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2790		 * can deal with.
2791		 */
2792
2793		args->flags	= data->flags & NFS4_MOUNT_FLAGMASK;
2794		args->rsize	= data->rsize;
2795		args->wsize	= data->wsize;
2796		args->timeo	= data->timeo;
2797		args->retrans	= data->retrans;
2798		args->acregmin	= data->acregmin;
2799		args->acregmax	= data->acregmax;
2800		args->acdirmin	= data->acdirmin;
2801		args->acdirmax	= data->acdirmax;
2802		args->nfs_server.protocol = data->proto;
2803		nfs_validate_transport_protocol(args);
2804		if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2805			goto out_invalid_transport_udp;
2806
2807		break;
2808	default:
2809		return NFS_TEXT_DATA;
2810	}
2811
2812	return 0;
2813
2814out_no_data:
2815	dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2816	return -EINVAL;
2817
2818out_inval_auth:
2819	dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2820		 data->auth_flavourlen);
2821	return -EINVAL;
2822
2823out_no_address:
2824	dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2825	return -EINVAL;
2826
2827out_invalid_transport_udp:
2828	dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2829	return -EINVAL;
2830}
2831
2832/*
2833 * NFS v4 module parameters need to stay in the
2834 * NFS client for backwards compatibility
2835 */
2836unsigned int nfs_callback_set_tcpport;
2837unsigned short nfs_callback_tcpport;
2838/* Default cache timeout is 10 minutes */
2839unsigned int nfs_idmap_cache_timeout = 600;
2840/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2841bool nfs4_disable_idmapping = true;
2842unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
 
2843unsigned short send_implementation_id = 1;
2844char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2845bool recover_lost_locks = false;
2846
 
2847EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2848EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2849EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2850EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2851EXPORT_SYMBOL_GPL(max_session_slots);
 
2852EXPORT_SYMBOL_GPL(send_implementation_id);
2853EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2854EXPORT_SYMBOL_GPL(recover_lost_locks);
2855
2856#define NFS_CALLBACK_MAXPORTNR (65535U)
2857
2858static int param_set_portnr(const char *val, const struct kernel_param *kp)
2859{
2860	unsigned long num;
2861	int ret;
2862
2863	if (!val)
2864		return -EINVAL;
2865	ret = kstrtoul(val, 0, &num);
2866	if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2867		return -EINVAL;
2868	*((unsigned int *)kp->arg) = num;
2869	return 0;
2870}
2871static struct kernel_param_ops param_ops_portnr = {
2872	.set = param_set_portnr,
2873	.get = param_get_uint,
2874};
2875#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2876
2877module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
 
 
 
2878module_param(nfs_idmap_cache_timeout, int, 0644);
2879module_param(nfs4_disable_idmapping, bool, 0644);
2880module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2881			NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2882MODULE_PARM_DESC(nfs4_disable_idmapping,
2883		"Turn off NFSv4 idmapping when using 'sec=sys'");
2884module_param(max_session_slots, ushort, 0644);
2885MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2886		"requests the client will negotiate");
 
 
 
2887module_param(send_implementation_id, ushort, 0644);
2888MODULE_PARM_DESC(send_implementation_id,
2889		"Send implementation ID with NFSv4.1 exchange_id");
2890MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2891
2892module_param(recover_lost_locks, bool, 0644);
2893MODULE_PARM_DESC(recover_lost_locks,
2894		 "If the server reports that a lock might be lost, "
2895		 "try to recover it risking data corruption.");
2896
2897
2898#endif /* CONFIG_NFS_V4 */