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