fs/ecryptfs/ecryptfs_kernel.h

   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
  52 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
  53 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
  54 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
  55
  56 struct 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
  63 struct ecryptfs_auth_tok_list {
  64         struct ecryptfs_auth_tok *auth_tok;
  65         struct list_head list;
  66 };
  67
  68 struct ecryptfs_crypt_stat;
  69 struct ecryptfs_mount_crypt_stat;
  70
  71 struct 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)
  83 static inline struct ecryptfs_auth_tok *
  84 ecryptfs_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
  93 static inline struct key *ecryptfs_get_encrypted_key(char *sig)
  94 {
  95         return request_key(&key_type_encrypted, sig, NULL);
  96 }
  97
  98 #else
  99 static inline struct ecryptfs_auth_tok *
 100 ecryptfs_get_encrypted_key_payload_data(struct key *key)
 101 {
 102         return NULL;
 103 }
 104
 105 static inline struct key *ecryptfs_get_encrypted_key(char *sig)
 106 {
 107         return ERR_PTR(-ENOKEY);
 108 }
 109
 110 #endif /* CONFIG_ENCRYPTED_KEYS */
 111
 112 static inline struct ecryptfs_auth_tok *
 113 ecryptfs_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
 175 #ifdef CONFIG_ECRYPT_FS_MESSAGING
 176 # define ECRYPTFS_VERSIONING_MASK_MESSAGING (ECRYPTFS_VERSIONING_DEVMISC \
 177                                              | ECRYPTFS_VERSIONING_PUBKEY)
 178 #else
 179 # define ECRYPTFS_VERSIONING_MASK_MESSAGING 0
 180 #endif
 181
 182 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
 183                                   | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
 184                                   | ECRYPTFS_VERSIONING_XATTR \
 185                                   | ECRYPTFS_VERSIONING_MULTKEY \
 186                                   | ECRYPTFS_VERSIONING_MASK_MESSAGING \
 187                                   | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION)
 188 struct ecryptfs_key_sig {
 189         struct list_head crypt_stat_list;
 190         char keysig[ECRYPTFS_SIG_SIZE_HEX + 1];
 191 };
 192
 193 struct ecryptfs_filename {
 194         struct list_head crypt_stat_list;
 195 #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001
 196         u32 flags;
 197         u32 seq_no;
 198         char *filename;
 199         char *encrypted_filename;
 200         size_t filename_size;
 201         size_t encrypted_filename_size;
 202         char fnek_sig[ECRYPTFS_SIG_SIZE_HEX];
 203         char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1];
 204 };
 205
 206 /**
 207  * This is the primary struct associated with each encrypted file.
 208  *
 209  * TODO: cache align/pack?
 210  */
 211 struct ecryptfs_crypt_stat {
 212 #define ECRYPTFS_STRUCT_INITIALIZED   0x00000001
 213 #define ECRYPTFS_POLICY_APPLIED       0x00000002
 214 #define ECRYPTFS_ENCRYPTED            0x00000004
 215 #define ECRYPTFS_SECURITY_WARNING     0x00000008
 216 #define ECRYPTFS_ENABLE_HMAC          0x00000010
 217 #define ECRYPTFS_ENCRYPT_IV_PAGES     0x00000020
 218 #define ECRYPTFS_KEY_VALID            0x00000040
 219 #define ECRYPTFS_METADATA_IN_XATTR    0x00000080
 220 #define ECRYPTFS_VIEW_AS_ENCRYPTED    0x00000100
 221 #define ECRYPTFS_KEY_SET              0x00000200
 222 #define ECRYPTFS_ENCRYPT_FILENAMES    0x00000400
 223 #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800
 224 #define ECRYPTFS_ENCFN_USE_FEK        0x00001000
 225 #define ECRYPTFS_UNLINK_SIGS          0x00002000
 226 #define ECRYPTFS_I_SIZE_INITIALIZED   0x00004000
 227         u32 flags;
 228         unsigned int file_version;
 229         size_t iv_bytes;
 230         size_t metadata_size;
 231         size_t extent_size; /* Data extent size; default is 4096 */
 232         size_t key_size;
 233         size_t extent_shift;
 234         unsigned int extent_mask;
 235         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 236         struct crypto_blkcipher *tfm;
 237         struct crypto_hash *hash_tfm; /* Crypto context for generating
 238                                        * the initialization vectors */
 239         unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
 240         unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
 241         unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
 242         struct list_head keysig_list;
 243         struct mutex keysig_list_mutex;
 244         struct mutex cs_tfm_mutex;
 245         struct mutex cs_hash_tfm_mutex;
 246         struct mutex cs_mutex;
 247 };
 248
 249 /* inode private data. */
 250 struct ecryptfs_inode_info {
 251         struct inode vfs_inode;
 252         struct inode *wii_inode;
 253         struct mutex lower_file_mutex;
 254         atomic_t lower_file_count;
 255         struct file *lower_file;
 256         struct ecryptfs_crypt_stat crypt_stat;
 257 };
 258
 259 /* dentry private data. Each dentry must keep track of a lower
 260  * vfsmount too. */
 261 struct ecryptfs_dentry_info {
 262         struct path lower_path;
 263         struct ecryptfs_crypt_stat *crypt_stat;
 264 };
 265
 266 /**
 267  * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
 268  * @flags: Status flags
 269  * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
 270  *                         cryptographic context. Every time a new
 271  *                         inode comes into existence, eCryptfs copies
 272  *                         the auth_toks on that list to the set of
 273  *                         auth_toks on the inode's crypt_stat
 274  * @global_auth_tok_key: The key from the user's keyring for the sig
 275  * @global_auth_tok: The key contents
 276  * @sig: The key identifier
 277  *
 278  * ecryptfs_global_auth_tok structs refer to authentication token keys
 279  * in the user keyring that apply to newly created files. A list of
 280  * these objects hangs off of the mount_crypt_stat struct for any
 281  * given eCryptfs mount. This struct maintains a reference to both the
 282  * key contents and the key itself so that the key can be put on
 283  * unmount.
 284  */
 285 struct ecryptfs_global_auth_tok {
 286 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
 287 #define ECRYPTFS_AUTH_TOK_FNEK    0x00000002
 288         u32 flags;
 289         struct list_head mount_crypt_stat_list;
 290         struct key *global_auth_tok_key;
 291         unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
 292 };
 293
 294 /**
 295  * ecryptfs_key_tfm - Persistent key tfm
 296  * @key_tfm: crypto API handle to the key
 297  * @key_size: Key size in bytes
 298  * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
 299  *                 using the persistent TFM at any point in time
 300  * @key_tfm_list: Handle to hang this off the module-wide TFM list
 301  * @cipher_name: String name for the cipher for this TFM
 302  *
 303  * Typically, eCryptfs will use the same ciphers repeatedly throughout
 304  * the course of its operations. In order to avoid unnecessarily
 305  * destroying and initializing the same cipher repeatedly, eCryptfs
 306  * keeps a list of crypto API contexts around to use when needed.
 307  */
 308 struct ecryptfs_key_tfm {
 309         struct crypto_blkcipher *key_tfm;
 310         size_t key_size;
 311         struct mutex key_tfm_mutex;
 312         struct list_head key_tfm_list;
 313         unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 314 };
 315
 316 extern struct mutex key_tfm_list_mutex;
 317
 318 /**
 319  * This struct is to enable a mount-wide passphrase/salt combo. This
 320  * is more or less a stopgap to provide similar functionality to other
 321  * crypto filesystems like EncFS or CFS until full policy support is
 322  * implemented in eCryptfs.
 323  */
 324 struct ecryptfs_mount_crypt_stat {
 325         /* Pointers to memory we do not own, do not free these */
 326 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
 327 #define ECRYPTFS_XATTR_METADATA_ENABLED        0x00000002
 328 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED        0x00000004
 329 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED  0x00000008
 330 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES      0x00000010
 331 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK   0x00000020
 332 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK          0x00000040
 333 #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY    0x00000080
 334         u32 flags;
 335         struct list_head global_auth_tok_list;
 336         struct mutex global_auth_tok_list_mutex;
 337         size_t global_default_cipher_key_size;
 338         size_t global_default_fn_cipher_key_bytes;
 339         unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
 340                                                  + 1];
 341         unsigned char global_default_fn_cipher_name[
 342                 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 343         char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
 344 };
 345
 346 /* superblock private data. */
 347 struct ecryptfs_sb_info {
 348         struct super_block *wsi_sb;
 349         struct ecryptfs_mount_crypt_stat mount_crypt_stat;
 350         struct backing_dev_info bdi;
 351 };
 352
 353 /* file private data. */
 354 struct ecryptfs_file_info {
 355         struct file *wfi_file;
 356         struct ecryptfs_crypt_stat *crypt_stat;
 357 };
 358
 359 /* auth_tok <=> encrypted_session_key mappings */
 360 struct ecryptfs_auth_tok_list_item {
 361         unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
 362         struct list_head list;
 363         struct ecryptfs_auth_tok auth_tok;
 364 };
 365
 366 struct ecryptfs_message {
 367         /* Can never be greater than ecryptfs_message_buf_len */
 368         /* Used to find the parent msg_ctx */
 369         /* Inherits from msg_ctx->index */
 370         u32 index;
 371         u32 data_len;
 372         u8 data[];
 373 };
 374
 375 struct ecryptfs_msg_ctx {
 376 #define ECRYPTFS_MSG_CTX_STATE_FREE     0x01
 377 #define ECRYPTFS_MSG_CTX_STATE_PENDING  0x02
 378 #define ECRYPTFS_MSG_CTX_STATE_DONE     0x03
 379 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
 380         u8 state;
 381 #define ECRYPTFS_MSG_HELO 100
 382 #define ECRYPTFS_MSG_QUIT 101
 383 #define ECRYPTFS_MSG_REQUEST 102
 384 #define ECRYPTFS_MSG_RESPONSE 103
 385         u8 type;
 386         u32 index;
 387         /* Counter converts to a sequence number. Each message sent
 388          * out for which we expect a response has an associated
 389          * sequence number. The response must have the same sequence
 390          * number as the counter for the msg_stc for the message to be
 391          * valid. */
 392         u32 counter;
 393         size_t msg_size;
 394         struct ecryptfs_message *msg;
 395         struct task_struct *task;
 396         struct list_head node;
 397         struct list_head daemon_out_list;
 398         struct mutex mux;
 399 };
 400
 401 struct ecryptfs_daemon {
 402 #define ECRYPTFS_DAEMON_IN_READ      0x00000001
 403 #define ECRYPTFS_DAEMON_IN_POLL      0x00000002
 404 #define ECRYPTFS_DAEMON_ZOMBIE       0x00000004
 405 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
 406         u32 flags;
 407         u32 num_queued_msg_ctx;
 408         struct file *file;
 409         struct mutex mux;
 410         struct list_head msg_ctx_out_queue;
 411         wait_queue_head_t wait;
 412         struct hlist_node euid_chain;
 413 };
 414
 415 #ifdef CONFIG_ECRYPT_FS_MESSAGING
 416 extern struct mutex ecryptfs_daemon_hash_mux;
 417 #endif
 418
 419 static inline size_t
 420 ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat)
 421 {
 422         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 423                 return 0;
 424         return crypt_stat->metadata_size;
 425 }
 426
 427 static inline struct ecryptfs_file_info *
 428 ecryptfs_file_to_private(struct file *file)
 429 {
 430         return file->private_data;
 431 }
 432
 433 static inline void
 434 ecryptfs_set_file_private(struct file *file,
 435                           struct ecryptfs_file_info *file_info)
 436 {
 437         file->private_data = file_info;
 438 }
 439
 440 static inline struct file *ecryptfs_file_to_lower(struct file *file)
 441 {
 442         return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
 443 }
 444
 445 static inline void
 446 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
 447 {
 448         ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
 449                 lower_file;
 450 }
 451
 452 static inline struct ecryptfs_inode_info *
 453 ecryptfs_inode_to_private(struct inode *inode)
 454 {
 455         return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
 456 }
 457
 458 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
 459 {
 460         return ecryptfs_inode_to_private(inode)->wii_inode;
 461 }
 462
 463 static inline void
 464 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
 465 {
 466         ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
 467 }
 468
 469 static inline struct ecryptfs_sb_info *
 470 ecryptfs_superblock_to_private(struct super_block *sb)
 471 {
 472         return (struct ecryptfs_sb_info *)sb->s_fs_info;
 473 }
 474
 475 static inline void
 476 ecryptfs_set_superblock_private(struct super_block *sb,
 477                                 struct ecryptfs_sb_info *sb_info)
 478 {
 479         sb->s_fs_info = sb_info;
 480 }
 481
 482 static inline struct super_block *
 483 ecryptfs_superblock_to_lower(struct super_block *sb)
 484 {
 485         return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
 486 }
 487
 488 static inline void
 489 ecryptfs_set_superblock_lower(struct super_block *sb,
 490                               struct super_block *lower_sb)
 491 {
 492         ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
 493 }
 494
 495 static inline struct ecryptfs_dentry_info *
 496 ecryptfs_dentry_to_private(struct dentry *dentry)
 497 {
 498         return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
 499 }
 500
 501 static inline void
 502 ecryptfs_set_dentry_private(struct dentry *dentry,
 503                             struct ecryptfs_dentry_info *dentry_info)
 504 {
 505         dentry->d_fsdata = dentry_info;
 506 }
 507
 508 static inline struct dentry *
 509 ecryptfs_dentry_to_lower(struct dentry *dentry)
 510 {
 511         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
 512 }
 513
 514 static inline void
 515 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
 516 {
 517         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
 518                 lower_dentry;
 519 }
 520
 521 static inline struct vfsmount *
 522 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
 523 {
 524         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
 525 }
 526
 527 static inline struct path *
 528 ecryptfs_dentry_to_lower_path(struct dentry *dentry)
 529 {
 530         return &((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path;
 531 }
 532
 533 static inline void
 534 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
 535 {
 536         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
 537                 lower_mnt;
 538 }
 539
 540 #define ecryptfs_printk(type, fmt, arg...) \
 541         __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
 542 __printf(1, 2)
 543 void __ecryptfs_printk(const char *fmt, ...);
 544
 545 extern const struct file_operations ecryptfs_main_fops;
 546 extern const struct file_operations ecryptfs_dir_fops;
 547 extern const struct inode_operations ecryptfs_main_iops;
 548 extern const struct inode_operations ecryptfs_dir_iops;
 549 extern const struct inode_operations ecryptfs_symlink_iops;
 550 extern const struct super_operations ecryptfs_sops;
 551 extern const struct dentry_operations ecryptfs_dops;
 552 extern const struct address_space_operations ecryptfs_aops;
 553 extern int ecryptfs_verbosity;
 554 extern unsigned int ecryptfs_message_buf_len;
 555 extern signed long ecryptfs_message_wait_timeout;
 556 extern unsigned int ecryptfs_number_of_users;
 557
 558 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
 559 extern struct kmem_cache *ecryptfs_file_info_cache;
 560 extern struct kmem_cache *ecryptfs_dentry_info_cache;
 561 extern struct kmem_cache *ecryptfs_inode_info_cache;
 562 extern struct kmem_cache *ecryptfs_sb_info_cache;
 563 extern struct kmem_cache *ecryptfs_header_cache;
 564 extern struct kmem_cache *ecryptfs_xattr_cache;
 565 extern struct kmem_cache *ecryptfs_key_record_cache;
 566 extern struct kmem_cache *ecryptfs_key_sig_cache;
 567 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
 568 extern struct kmem_cache *ecryptfs_key_tfm_cache;
 569
 570 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 571                                  struct super_block *sb);
 572 void ecryptfs_i_size_init(const char *page_virt, struct inode *inode);
 573 int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
 574                              struct inode *ecryptfs_inode);
 575 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
 576                                          size_t *decrypted_name_size,
 577                                          struct dentry *ecryptfs_dentry,
 578                                          const char *name, size_t name_size);
 579 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
 580 int ecryptfs_encrypt_and_encode_filename(
 581         char **encoded_name,
 582         size_t *encoded_name_size,
 583         struct ecryptfs_crypt_stat *crypt_stat,
 584         struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 585         const char *name, size_t name_size);
 586 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
 587 void ecryptfs_dump_hex(char *data, int bytes);
 588 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
 589                         int sg_size);
 590 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
 591 void ecryptfs_rotate_iv(unsigned char *iv);
 592 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 593 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 594 void ecryptfs_destroy_mount_crypt_stat(
 595         struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 596 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
 597 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
 598 int ecryptfs_encrypt_page(struct page *page);
 599 int ecryptfs_decrypt_page(struct page *page);
 600 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
 601                             struct inode *ecryptfs_inode);
 602 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
 603 int ecryptfs_new_file_context(struct inode *ecryptfs_inode);
 604 void ecryptfs_write_crypt_stat_flags(char *page_virt,
 605                                      struct ecryptfs_crypt_stat *crypt_stat,
 606                                      size_t *written);
 607 int ecryptfs_read_and_validate_header_region(struct inode *inode);
 608 int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
 609                                             struct inode *inode);
 610 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
 611 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
 612 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
 613 int ecryptfs_generate_key_packet_set(char *dest_base,
 614                                      struct ecryptfs_crypt_stat *crypt_stat,
 615                                      struct dentry *ecryptfs_dentry,
 616                                      size_t *len, size_t max);
 617 int
 618 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
 619                           unsigned char *src, struct dentry *ecryptfs_dentry);
 620 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
 621 ssize_t
 622 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
 623                         void *value, size_t size);
 624 int
 625 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 626                   size_t size, int flags);
 627 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
 628 #ifdef CONFIG_ECRYPT_FS_MESSAGING
 629 int ecryptfs_process_response(struct ecryptfs_daemon *daemon,
 630                               struct ecryptfs_message *msg, u32 seq);
 631 int ecryptfs_send_message(char *data, int data_len,
 632                           struct ecryptfs_msg_ctx **msg_ctx);
 633 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 634                                struct ecryptfs_message **emsg);
 635 int ecryptfs_init_messaging(void);
 636 void ecryptfs_release_messaging(void);
 637 #else
 638 static inline int ecryptfs_init_messaging(void)
 639 {
 640         return 0;
 641 }
 642 static inline void ecryptfs_release_messaging(void)
 643 { }
 644 static inline int ecryptfs_send_message(char *data, int data_len,
 645                                         struct ecryptfs_msg_ctx **msg_ctx)
 646 {
 647         return -ENOTCONN;
 648 }
 649 static inline int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 650                                              struct ecryptfs_message **emsg)
 651 {
 652         return -ENOMSG;
 653 }
 654 #endif
 655
 656 void
 657 ecryptfs_write_header_metadata(char *virt,
 658                                struct ecryptfs_crypt_stat *crypt_stat,
 659                                size_t *written);
 660 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
 661 int
 662 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 663                            char *sig, u32 global_auth_tok_flags);
 664 int ecryptfs_get_global_auth_tok_for_sig(
 665         struct ecryptfs_global_auth_tok **global_auth_tok,
 666         struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
 667 int
 668 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
 669                          size_t key_size);
 670 int ecryptfs_init_crypto(void);
 671 int ecryptfs_destroy_crypto(void);
 672 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
 673 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
 674                                                struct mutex **tfm_mutex,
 675                                                char *cipher_name);
 676 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 677                                       struct ecryptfs_auth_tok **auth_tok,
 678                                       char *sig);
 679 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
 680                          loff_t offset, size_t size);
 681 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
 682                                       struct page *page_for_lower,
 683                                       size_t offset_in_page, size_t size);
 684 int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size);
 685 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
 686                         struct inode *ecryptfs_inode);
 687 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
 688                                      pgoff_t page_index,
 689                                      size_t offset_in_page, size_t size,
 690                                      struct inode *ecryptfs_inode);
 691 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
 692 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
 693                                  size_t *length_size);
 694 int ecryptfs_write_packet_length(char *dest, size_t size,
 695                                  size_t *packet_size_length);
 696 #ifdef CONFIG_ECRYPT_FS_MESSAGING
 697 int ecryptfs_init_ecryptfs_miscdev(void);
 698 void ecryptfs_destroy_ecryptfs_miscdev(void);
 699 int ecryptfs_send_miscdev(char *data, size_t data_size,
 700                           struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
 701                           u16 msg_flags, struct ecryptfs_daemon *daemon);
 702 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
 703 int
 704 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file);
 705 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
 706 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon);
 707 #endif
 708 int ecryptfs_init_kthread(void);
 709 void ecryptfs_destroy_kthread(void);
 710 int ecryptfs_privileged_open(struct file **lower_file,
 711                              struct dentry *lower_dentry,
 712                              struct vfsmount *lower_mnt,
 713                              const struct cred *cred);
 714 int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode);
 715 void ecryptfs_put_lower_file(struct inode *inode);
 716 int
 717 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
 718                              size_t *packet_size,
 719                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 720                              char *filename, size_t filename_size);
 721 int
 722 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
 723                              size_t *packet_size,
 724                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 725                              char *data, size_t max_packet_size);
 726 int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
 727                            struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 728 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
 729                        loff_t offset);
 730
 731 #endif /* #ifndef ECRYPTFS_KERNEL_H */