linux/fs/ecryptfs/ecryptfs_kernel.h
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   1/**
   2 * eCryptfs: Linux filesystem encryption layer
   3 * Kernel declarations.
   4 *
   5 * Copyright (C) 1997-2003 Erez Zadok
   6 * Copyright (C) 2001-2003 Stony Brook University
   7 * Copyright (C) 2004-2008 International Business Machines Corp.
   8 *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
   9 *              Trevor S. Highland <trevor.highland@gmail.com>
  10 *              Tyler Hicks <tyhicks@ou.edu>
  11 *
  12 * This program is free software; you can redistribute it and/or
  13 * modify it under the terms of the GNU General Public License as
  14 * published by the Free Software Foundation; either version 2 of the
  15 * License, or (at your option) any later version.
  16 *
  17 * This program is distributed in the hope that it will be useful, but
  18 * WITHOUT ANY WARRANTY; without even the implied warranty of
  19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 * General Public License for more details.
  21 *
  22 * You should have received a copy of the GNU General Public License
  23 * along with this program; if not, write to the Free Software
  24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  25 * 02111-1307, USA.
  26 */
  27
  28#ifndef ECRYPTFS_KERNEL_H
  29#define ECRYPTFS_KERNEL_H
  30
  31#include <keys/user-type.h>
  32#include <keys/encrypted-type.h>
  33#include <linux/fs.h>
  34#include <linux/fs_stack.h>
  35#include <linux/namei.h>
  36#include <linux/scatterlist.h>
  37#include <linux/hash.h>
  38#include <linux/nsproxy.h>
  39#include <linux/backing-dev.h>
  40#include <linux/ecryptfs.h>
  41#include <linux/crypto.h>
  42
  43#define ECRYPTFS_DEFAULT_IV_BYTES 16
  44#define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
  45#define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
  46#define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
  47#define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
  48#define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
  49#define ECRYPTFS_DEFAULT_NUM_USERS 4
  50#define ECRYPTFS_MAX_NUM_USERS 32768
  51#define ECRYPTFS_XATTR_NAME "user.ecryptfs"
  52
  53void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
  54extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
  55extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
  56
  57struct ecryptfs_key_record {
  58        unsigned char type;
  59        size_t enc_key_size;
  60        unsigned char sig[ECRYPTFS_SIG_SIZE];
  61        unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
  62};
  63
  64struct ecryptfs_auth_tok_list {
  65        struct ecryptfs_auth_tok *auth_tok;
  66        struct list_head list;
  67};
  68
  69struct ecryptfs_crypt_stat;
  70struct ecryptfs_mount_crypt_stat;
  71
  72struct ecryptfs_page_crypt_context {
  73        struct page *page;
  74#define ECRYPTFS_PREPARE_COMMIT_MODE 0
  75#define ECRYPTFS_WRITEPAGE_MODE      1
  76        unsigned int mode;
  77        union {
  78                struct file *lower_file;
  79                struct writeback_control *wbc;
  80        } param;
  81};
  82
  83#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
  84static inline struct ecryptfs_auth_tok *
  85ecryptfs_get_encrypted_key_payload_data(struct key *key)
  86{
  87        if (key->type == &key_type_encrypted)
  88                return (struct ecryptfs_auth_tok *)
  89                        (&((struct encrypted_key_payload *)key->payload.data)->payload_data);
  90        else
  91                return NULL;
  92}
  93
  94static inline struct key *ecryptfs_get_encrypted_key(char *sig)
  95{
  96        return request_key(&key_type_encrypted, sig, NULL);
  97}
  98
  99#else
 100static inline struct ecryptfs_auth_tok *
 101ecryptfs_get_encrypted_key_payload_data(struct key *key)
 102{
 103        return NULL;
 104}
 105
 106static inline struct key *ecryptfs_get_encrypted_key(char *sig)
 107{
 108        return ERR_PTR(-ENOKEY);
 109}
 110
 111#endif /* CONFIG_ENCRYPTED_KEYS */
 112
 113static inline struct ecryptfs_auth_tok *
 114ecryptfs_get_key_payload_data(struct key *key)
 115{
 116        struct ecryptfs_auth_tok *auth_tok;
 117
 118        auth_tok = ecryptfs_get_encrypted_key_payload_data(key);
 119        if (!auth_tok)
 120                return (struct ecryptfs_auth_tok *)
 121                        (((struct user_key_payload *)key->payload.data)->data);
 122        else
 123                return auth_tok;
 124}
 125
 126#define ECRYPTFS_MAX_KEYSET_SIZE 1024
 127#define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
 128#define ECRYPTFS_MAX_NUM_ENC_KEYS 64
 129#define ECRYPTFS_MAX_IV_BYTES 16        /* 128 bits */
 130#define ECRYPTFS_SALT_BYTES 2
 131#define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
 132#define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8      /* 4*2 */
 133#define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
 134#define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \
 135                                        + MAGIC_ECRYPTFS_MARKER_SIZE_BYTES)
 136#define ECRYPTFS_DEFAULT_CIPHER "aes"
 137#define ECRYPTFS_DEFAULT_KEY_BYTES 16
 138#define ECRYPTFS_DEFAULT_HASH "md5"
 139#define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH
 140#define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
 141#define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
 142#define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
 143#define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
 144#define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
 145#define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
 146#define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
 147#define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename
 148                                          * as dentry name */
 149#define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in
 150                                          * metadata */
 151#define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as
 152                                          * dentry name */
 153#define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as
 154                                          * metadata */
 155#define ECRYPTFS_MIN_PKT_LEN_SIZE 1 /* Min size to specify packet length */
 156#define ECRYPTFS_MAX_PKT_LEN_SIZE 2 /* Pass at least this many bytes to
 157                                     * ecryptfs_parse_packet_length() and
 158                                     * ecryptfs_write_packet_length()
 159                                     */
 160/* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >=
 161 * ECRYPTFS_MAX_IV_BYTES */
 162#define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16
 163#define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */
 164#define MD5_DIGEST_SIZE 16
 165#define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE
 166#define ECRYPTFS_TAG_70_MIN_METADATA_SIZE (1 + ECRYPTFS_MIN_PKT_LEN_SIZE \
 167                                           + ECRYPTFS_SIG_SIZE + 1 + 1)
 168#define ECRYPTFS_TAG_70_MAX_METADATA_SIZE (1 + ECRYPTFS_MAX_PKT_LEN_SIZE \
 169                                           + ECRYPTFS_SIG_SIZE + 1 + 1)
 170#define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED."
 171#define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23
 172#define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED."
 173#define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24
 174#define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32)
 175
 176#ifdef CONFIG_ECRYPT_FS_MESSAGING
 177# define ECRYPTFS_VERSIONING_MASK_MESSAGING (ECRYPTFS_VERSIONING_DEVMISC \
 178                                             | ECRYPTFS_VERSIONING_PUBKEY)
 179#else
 180# define ECRYPTFS_VERSIONING_MASK_MESSAGING 0
 181#endif
 182
 183#define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
 184                                  | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
 185                                  | ECRYPTFS_VERSIONING_XATTR \
 186                                  | ECRYPTFS_VERSIONING_MULTKEY \
 187                                  | ECRYPTFS_VERSIONING_MASK_MESSAGING \
 188                                  | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION)
 189struct ecryptfs_key_sig {
 190        struct list_head crypt_stat_list;
 191        char keysig[ECRYPTFS_SIG_SIZE_HEX + 1];
 192};
 193
 194struct ecryptfs_filename {
 195        struct list_head crypt_stat_list;
 196#define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001
 197        u32 flags;
 198        u32 seq_no;
 199        char *filename;
 200        char *encrypted_filename;
 201        size_t filename_size;
 202        size_t encrypted_filename_size;
 203        char fnek_sig[ECRYPTFS_SIG_SIZE_HEX];
 204        char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1];
 205};
 206
 207/**
 208 * This is the primary struct associated with each encrypted file.
 209 *
 210 * TODO: cache align/pack?
 211 */
 212struct ecryptfs_crypt_stat {
 213#define ECRYPTFS_STRUCT_INITIALIZED   0x00000001
 214#define ECRYPTFS_POLICY_APPLIED       0x00000002
 215#define ECRYPTFS_ENCRYPTED            0x00000004
 216#define ECRYPTFS_SECURITY_WARNING     0x00000008
 217#define ECRYPTFS_ENABLE_HMAC          0x00000010
 218#define ECRYPTFS_ENCRYPT_IV_PAGES     0x00000020
 219#define ECRYPTFS_KEY_VALID            0x00000040
 220#define ECRYPTFS_METADATA_IN_XATTR    0x00000080
 221#define ECRYPTFS_VIEW_AS_ENCRYPTED    0x00000100
 222#define ECRYPTFS_KEY_SET              0x00000200
 223#define ECRYPTFS_ENCRYPT_FILENAMES    0x00000400
 224#define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800
 225#define ECRYPTFS_ENCFN_USE_FEK        0x00001000
 226#define ECRYPTFS_UNLINK_SIGS          0x00002000
 227#define ECRYPTFS_I_SIZE_INITIALIZED   0x00004000
 228        u32 flags;
 229        unsigned int file_version;
 230        size_t iv_bytes;
 231        size_t metadata_size;
 232        size_t extent_size; /* Data extent size; default is 4096 */
 233        size_t key_size;
 234        size_t extent_shift;
 235        unsigned int extent_mask;
 236        struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 237        struct crypto_ablkcipher *tfm;
 238        struct crypto_hash *hash_tfm; /* Crypto context for generating
 239                                       * the initialization vectors */
 240        unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
 241        unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
 242        unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
 243        struct list_head keysig_list;
 244        struct mutex keysig_list_mutex;
 245        struct mutex cs_tfm_mutex;
 246        struct mutex cs_hash_tfm_mutex;
 247        struct mutex cs_mutex;
 248};
 249
 250/* inode private data. */
 251struct ecryptfs_inode_info {
 252        struct inode vfs_inode;
 253        struct inode *wii_inode;
 254        struct mutex lower_file_mutex;
 255        atomic_t lower_file_count;
 256        struct file *lower_file;
 257        struct ecryptfs_crypt_stat crypt_stat;
 258};
 259
 260/* dentry private data. Each dentry must keep track of a lower
 261 * vfsmount too. */
 262struct ecryptfs_dentry_info {
 263        struct path lower_path;
 264        struct ecryptfs_crypt_stat *crypt_stat;
 265};
 266
 267/**
 268 * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
 269 * @flags: Status flags
 270 * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
 271 *                         cryptographic context. Every time a new
 272 *                         inode comes into existence, eCryptfs copies
 273 *                         the auth_toks on that list to the set of
 274 *                         auth_toks on the inode's crypt_stat
 275 * @global_auth_tok_key: The key from the user's keyring for the sig
 276 * @global_auth_tok: The key contents
 277 * @sig: The key identifier
 278 *
 279 * ecryptfs_global_auth_tok structs refer to authentication token keys
 280 * in the user keyring that apply to newly created files. A list of
 281 * these objects hangs off of the mount_crypt_stat struct for any
 282 * given eCryptfs mount. This struct maintains a reference to both the
 283 * key contents and the key itself so that the key can be put on
 284 * unmount.
 285 */
 286struct ecryptfs_global_auth_tok {
 287#define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
 288#define ECRYPTFS_AUTH_TOK_FNEK    0x00000002
 289        u32 flags;
 290        struct list_head mount_crypt_stat_list;
 291        struct key *global_auth_tok_key;
 292        unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
 293};
 294
 295/**
 296 * ecryptfs_key_tfm - Persistent key tfm
 297 * @key_tfm: crypto API handle to the key
 298 * @key_size: Key size in bytes
 299 * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
 300 *                 using the persistent TFM at any point in time
 301 * @key_tfm_list: Handle to hang this off the module-wide TFM list
 302 * @cipher_name: String name for the cipher for this TFM
 303 *
 304 * Typically, eCryptfs will use the same ciphers repeatedly throughout
 305 * the course of its operations. In order to avoid unnecessarily
 306 * destroying and initializing the same cipher repeatedly, eCryptfs
 307 * keeps a list of crypto API contexts around to use when needed.
 308 */
 309struct ecryptfs_key_tfm {
 310        struct crypto_blkcipher *key_tfm;
 311        size_t key_size;
 312        struct mutex key_tfm_mutex;
 313        struct list_head key_tfm_list;
 314        unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 315};
 316
 317extern struct mutex key_tfm_list_mutex;
 318
 319/**
 320 * This struct is to enable a mount-wide passphrase/salt combo. This
 321 * is more or less a stopgap to provide similar functionality to other
 322 * crypto filesystems like EncFS or CFS until full policy support is
 323 * implemented in eCryptfs.
 324 */
 325struct ecryptfs_mount_crypt_stat {
 326        /* Pointers to memory we do not own, do not free these */
 327#define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
 328#define ECRYPTFS_XATTR_METADATA_ENABLED        0x00000002
 329#define ECRYPTFS_ENCRYPTED_VIEW_ENABLED        0x00000004
 330#define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED  0x00000008
 331#define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES      0x00000010
 332#define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK   0x00000020
 333#define ECRYPTFS_GLOBAL_ENCFN_USE_FEK          0x00000040
 334#define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY    0x00000080
 335        u32 flags;
 336        struct list_head global_auth_tok_list;
 337        struct mutex global_auth_tok_list_mutex;
 338        size_t global_default_cipher_key_size;
 339        size_t global_default_fn_cipher_key_bytes;
 340        unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
 341                                                 + 1];
 342        unsigned char global_default_fn_cipher_name[
 343                ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 344        char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
 345};
 346
 347/* superblock private data. */
 348struct ecryptfs_sb_info {
 349        struct super_block *wsi_sb;
 350        struct ecryptfs_mount_crypt_stat mount_crypt_stat;
 351        struct backing_dev_info bdi;
 352};
 353
 354/* file private data. */
 355struct ecryptfs_file_info {
 356        struct file *wfi_file;
 357        struct ecryptfs_crypt_stat *crypt_stat;
 358};
 359
 360/* auth_tok <=> encrypted_session_key mappings */
 361struct ecryptfs_auth_tok_list_item {
 362        unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
 363        struct list_head list;
 364        struct ecryptfs_auth_tok auth_tok;
 365};
 366
 367struct ecryptfs_message {
 368        /* Can never be greater than ecryptfs_message_buf_len */
 369        /* Used to find the parent msg_ctx */
 370        /* Inherits from msg_ctx->index */
 371        u32 index;
 372        u32 data_len;
 373        u8 data[];
 374};
 375
 376struct ecryptfs_msg_ctx {
 377#define ECRYPTFS_MSG_CTX_STATE_FREE     0x01
 378#define ECRYPTFS_MSG_CTX_STATE_PENDING  0x02
 379#define ECRYPTFS_MSG_CTX_STATE_DONE     0x03
 380#define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
 381        u8 state;
 382#define ECRYPTFS_MSG_HELO 100
 383#define ECRYPTFS_MSG_QUIT 101
 384#define ECRYPTFS_MSG_REQUEST 102
 385#define ECRYPTFS_MSG_RESPONSE 103
 386        u8 type;
 387        u32 index;
 388        /* Counter converts to a sequence number. Each message sent
 389         * out for which we expect a response has an associated
 390         * sequence number. The response must have the same sequence
 391         * number as the counter for the msg_stc for the message to be
 392         * valid. */
 393        u32 counter;
 394        size_t msg_size;
 395        struct ecryptfs_message *msg;
 396        struct task_struct *task;
 397        struct list_head node;
 398        struct list_head daemon_out_list;
 399        struct mutex mux;
 400};
 401
 402struct ecryptfs_daemon {
 403#define ECRYPTFS_DAEMON_IN_READ      0x00000001
 404#define ECRYPTFS_DAEMON_IN_POLL      0x00000002
 405#define ECRYPTFS_DAEMON_ZOMBIE       0x00000004
 406#define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
 407        u32 flags;
 408        u32 num_queued_msg_ctx;
 409        struct file *file;
 410        struct mutex mux;
 411        struct list_head msg_ctx_out_queue;
 412        wait_queue_head_t wait;
 413        struct hlist_node euid_chain;
 414};
 415
 416#ifdef CONFIG_ECRYPT_FS_MESSAGING
 417extern struct mutex ecryptfs_daemon_hash_mux;
 418#endif
 419
 420static inline size_t
 421ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat)
 422{
 423        if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 424                return 0;
 425        return crypt_stat->metadata_size;
 426}
 427
 428static inline struct ecryptfs_file_info *
 429ecryptfs_file_to_private(struct file *file)
 430{
 431        return file->private_data;
 432}
 433
 434static inline void
 435ecryptfs_set_file_private(struct file *file,
 436                          struct ecryptfs_file_info *file_info)
 437{
 438        file->private_data = file_info;
 439}
 440
 441static inline struct file *ecryptfs_file_to_lower(struct file *file)
 442{
 443        return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
 444}
 445
 446static inline void
 447ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
 448{
 449        ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
 450                lower_file;
 451}
 452
 453static inline struct ecryptfs_inode_info *
 454ecryptfs_inode_to_private(struct inode *inode)
 455{
 456        return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
 457}
 458
 459static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
 460{
 461        return ecryptfs_inode_to_private(inode)->wii_inode;
 462}
 463
 464static inline void
 465ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
 466{
 467        ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
 468}
 469
 470static inline struct ecryptfs_sb_info *
 471ecryptfs_superblock_to_private(struct super_block *sb)
 472{
 473        return (struct ecryptfs_sb_info *)sb->s_fs_info;
 474}
 475
 476static inline void
 477ecryptfs_set_superblock_private(struct super_block *sb,
 478                                struct ecryptfs_sb_info *sb_info)
 479{
 480        sb->s_fs_info = sb_info;
 481}
 482
 483static inline struct super_block *
 484ecryptfs_superblock_to_lower(struct super_block *sb)
 485{
 486        return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
 487}
 488
 489static inline void
 490ecryptfs_set_superblock_lower(struct super_block *sb,
 491                              struct super_block *lower_sb)
 492{
 493        ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
 494}
 495
 496static inline struct ecryptfs_dentry_info *
 497ecryptfs_dentry_to_private(struct dentry *dentry)
 498{
 499        return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
 500}
 501
 502static inline void
 503ecryptfs_set_dentry_private(struct dentry *dentry,
 504                            struct ecryptfs_dentry_info *dentry_info)
 505{
 506        dentry->d_fsdata = dentry_info;
 507}
 508
 509static inline struct dentry *
 510ecryptfs_dentry_to_lower(struct dentry *dentry)
 511{
 512        return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
 513}
 514
 515static inline void
 516ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
 517{
 518        ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
 519                lower_dentry;
 520}
 521
 522static inline struct vfsmount *
 523ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
 524{
 525        return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
 526}
 527
 528static inline struct path *
 529ecryptfs_dentry_to_lower_path(struct dentry *dentry)
 530{
 531        return &((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path;
 532}
 533
 534static inline void
 535ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
 536{
 537        ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
 538                lower_mnt;
 539}
 540
 541#define ecryptfs_printk(type, fmt, arg...) \
 542        __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
 543__printf(1, 2)
 544void __ecryptfs_printk(const char *fmt, ...);
 545
 546extern const struct file_operations ecryptfs_main_fops;
 547extern const struct file_operations ecryptfs_dir_fops;
 548extern const struct inode_operations ecryptfs_main_iops;
 549extern const struct inode_operations ecryptfs_dir_iops;
 550extern const struct inode_operations ecryptfs_symlink_iops;
 551extern const struct super_operations ecryptfs_sops;
 552extern const struct dentry_operations ecryptfs_dops;
 553extern const struct address_space_operations ecryptfs_aops;
 554extern int ecryptfs_verbosity;
 555extern unsigned int ecryptfs_message_buf_len;
 556extern signed long ecryptfs_message_wait_timeout;
 557extern unsigned int ecryptfs_number_of_users;
 558
 559extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
 560extern struct kmem_cache *ecryptfs_file_info_cache;
 561extern struct kmem_cache *ecryptfs_dentry_info_cache;
 562extern struct kmem_cache *ecryptfs_inode_info_cache;
 563extern struct kmem_cache *ecryptfs_sb_info_cache;
 564extern struct kmem_cache *ecryptfs_header_cache;
 565extern struct kmem_cache *ecryptfs_xattr_cache;
 566extern struct kmem_cache *ecryptfs_key_record_cache;
 567extern struct kmem_cache *ecryptfs_key_sig_cache;
 568extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
 569extern struct kmem_cache *ecryptfs_key_tfm_cache;
 570
 571struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 572                                 struct super_block *sb);
 573void ecryptfs_i_size_init(const char *page_virt, struct inode *inode);
 574int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
 575                             struct inode *ecryptfs_inode);
 576int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
 577                                         size_t *decrypted_name_size,
 578                                         struct super_block *sb,
 579                                         const char *name, size_t name_size);
 580int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
 581int ecryptfs_encrypt_and_encode_filename(
 582        char **encoded_name,
 583        size_t *encoded_name_size,
 584        struct ecryptfs_crypt_stat *crypt_stat,
 585        struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 586        const char *name, size_t name_size);
 587struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
 588void ecryptfs_dump_hex(char *data, int bytes);
 589int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
 590                        int sg_size);
 591int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
 592void ecryptfs_rotate_iv(unsigned char *iv);
 593void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 594void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 595void ecryptfs_destroy_mount_crypt_stat(
 596        struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 597int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
 598int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
 599int ecryptfs_encrypt_page(struct page *page);
 600int ecryptfs_decrypt_page(struct page *page);
 601int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
 602                            struct inode *ecryptfs_inode);
 603int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
 604int ecryptfs_new_file_context(struct inode *ecryptfs_inode);
 605void ecryptfs_write_crypt_stat_flags(char *page_virt,
 606                                     struct ecryptfs_crypt_stat *crypt_stat,
 607                                     size_t *written);
 608int ecryptfs_read_and_validate_header_region(struct inode *inode);
 609int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
 610                                            struct inode *inode);
 611u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
 612int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
 613void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
 614int ecryptfs_generate_key_packet_set(char *dest_base,
 615                                     struct ecryptfs_crypt_stat *crypt_stat,
 616                                     struct dentry *ecryptfs_dentry,
 617                                     size_t *len, size_t max);
 618int
 619ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
 620                          unsigned char *src, struct dentry *ecryptfs_dentry);
 621int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
 622ssize_t
 623ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
 624                        void *value, size_t size);
 625int
 626ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 627                  size_t size, int flags);
 628int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
 629#ifdef CONFIG_ECRYPT_FS_MESSAGING
 630int ecryptfs_process_response(struct ecryptfs_daemon *daemon,
 631                              struct ecryptfs_message *msg, u32 seq);
 632int ecryptfs_send_message(char *data, int data_len,
 633                          struct ecryptfs_msg_ctx **msg_ctx);
 634int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 635                               struct ecryptfs_message **emsg);
 636int ecryptfs_init_messaging(void);
 637void ecryptfs_release_messaging(void);
 638#else
 639static inline int ecryptfs_init_messaging(void)
 640{
 641        return 0;
 642}
 643static inline void ecryptfs_release_messaging(void)
 644{ }
 645static inline int ecryptfs_send_message(char *data, int data_len,
 646                                        struct ecryptfs_msg_ctx **msg_ctx)
 647{
 648        return -ENOTCONN;
 649}
 650static inline int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 651                                             struct ecryptfs_message **emsg)
 652{
 653        return -ENOMSG;
 654}
 655#endif
 656
 657void
 658ecryptfs_write_header_metadata(char *virt,
 659                               struct ecryptfs_crypt_stat *crypt_stat,
 660                               size_t *written);
 661int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
 662int
 663ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 664                           char *sig, u32 global_auth_tok_flags);
 665int ecryptfs_get_global_auth_tok_for_sig(
 666        struct ecryptfs_global_auth_tok **global_auth_tok,
 667        struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
 668int
 669ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
 670                         size_t key_size);
 671int ecryptfs_init_crypto(void);
 672int ecryptfs_destroy_crypto(void);
 673int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
 674int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
 675                                               struct mutex **tfm_mutex,
 676                                               char *cipher_name);
 677int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 678                                      struct ecryptfs_auth_tok **auth_tok,
 679                                      char *sig);
 680int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
 681                         loff_t offset, size_t size);
 682int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
 683                                      struct page *page_for_lower,
 684                                      size_t offset_in_page, size_t size);
 685int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size);
 686int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
 687                        struct inode *ecryptfs_inode);
 688int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
 689                                     pgoff_t page_index,
 690                                     size_t offset_in_page, size_t size,
 691                                     struct inode *ecryptfs_inode);
 692struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
 693int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
 694                                 size_t *length_size);
 695int ecryptfs_write_packet_length(char *dest, size_t size,
 696                                 size_t *packet_size_length);
 697#ifdef CONFIG_ECRYPT_FS_MESSAGING
 698int ecryptfs_init_ecryptfs_miscdev(void);
 699void ecryptfs_destroy_ecryptfs_miscdev(void);
 700int ecryptfs_send_miscdev(char *data, size_t data_size,
 701                          struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
 702                          u16 msg_flags, struct ecryptfs_daemon *daemon);
 703void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
 704int
 705ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file);
 706int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
 707int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon);
 708#endif
 709int ecryptfs_init_kthread(void);
 710void ecryptfs_destroy_kthread(void);
 711int ecryptfs_privileged_open(struct file **lower_file,
 712                             struct dentry *lower_dentry,
 713                             struct vfsmount *lower_mnt,
 714                             const struct cred *cred);
 715int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode);
 716void ecryptfs_put_lower_file(struct inode *inode);
 717int
 718ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
 719                             size_t *packet_size,
 720                             struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 721                             char *filename, size_t filename_size);
 722int
 723ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
 724                             size_t *packet_size,
 725                             struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 726                             char *data, size_t max_packet_size);
 727int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
 728                           struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 729int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
 730                       loff_t offset);
 731
 732#endif /* #ifndef ECRYPTFS_KERNEL_H */
 733
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