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 struct ecryptfs_key_sig {
 176         struct list_head crypt_stat_list;
 177         char keysig[ECRYPTFS_SIG_SIZE_HEX + 1];
 178 };
 179
 180 struct 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  */
 198 struct 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. */
 237 struct 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. */
 248 struct 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  */
 272 struct 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  */
 295 struct 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
 303 extern 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  */
 311 struct 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. */
 334 struct 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. */
 341 struct ecryptfs_file_info {
 342         struct file *wfi_file;
 343         struct ecryptfs_crypt_stat *crypt_stat;
 344 };
 345
 346 /* auth_tok <=> encrypted_session_key mappings */
 347 struct 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
 353 struct 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
 362 struct 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
 388 struct 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
 402 extern struct mutex ecryptfs_daemon_hash_mux;
 403
 404 static inline size_t
 405 ecryptfs_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
 412 static inline struct ecryptfs_file_info *
 413 ecryptfs_file_to_private(struct file *file)
 414 {
 415         return file->private_data;
 416 }
 417
 418 static inline void
 419 ecryptfs_set_file_private(struct file *file,
 420                           struct ecryptfs_file_info *file_info)
 421 {
 422         file->private_data = file_info;
 423 }
 424
 425 static inline struct file *ecryptfs_file_to_lower(struct file *file)
 426 {
 427         return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
 428 }
 429
 430 static inline void
 431 ecryptfs_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
 437 static inline struct ecryptfs_inode_info *
 438 ecryptfs_inode_to_private(struct inode *inode)
 439 {
 440         return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
 441 }
 442
 443 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
 444 {
 445         return ecryptfs_inode_to_private(inode)->wii_inode;
 446 }
 447
 448 static inline void
 449 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
 450 {
 451         ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
 452 }
 453
 454 static inline struct ecryptfs_sb_info *
 455 ecryptfs_superblock_to_private(struct super_block *sb)
 456 {
 457         return (struct ecryptfs_sb_info *)sb->s_fs_info;
 458 }
 459
 460 static inline void
 461 ecryptfs_set_superblock_private(struct super_block *sb,
 462                                 struct ecryptfs_sb_info *sb_info)
 463 {
 464         sb->s_fs_info = sb_info;
 465 }
 466
 467 static inline struct super_block *
 468 ecryptfs_superblock_to_lower(struct super_block *sb)
 469 {
 470         return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
 471 }
 472
 473 static inline void
 474 ecryptfs_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
 480 static inline struct ecryptfs_dentry_info *
 481 ecryptfs_dentry_to_private(struct dentry *dentry)
 482 {
 483         return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
 484 }
 485
 486 static inline void
 487 ecryptfs_set_dentry_private(struct dentry *dentry,
 488                             struct ecryptfs_dentry_info *dentry_info)
 489 {
 490         dentry->d_fsdata = dentry_info;
 491 }
 492
 493 static inline struct dentry *
 494 ecryptfs_dentry_to_lower(struct dentry *dentry)
 495 {
 496         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
 497 }
 498
 499 static inline void
 500 ecryptfs_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
 506 static inline struct vfsmount *
 507 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
 508 {
 509         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
 510 }
 511
 512 static inline void
 513 ecryptfs_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)
 522 void __ecryptfs_printk(const char *fmt, ...);
 523
 524 extern const struct file_operations ecryptfs_main_fops;
 525 extern const struct file_operations ecryptfs_dir_fops;
 526 extern const struct inode_operations ecryptfs_main_iops;
 527 extern const struct inode_operations ecryptfs_dir_iops;
 528 extern const struct inode_operations ecryptfs_symlink_iops;
 529 extern const struct super_operations ecryptfs_sops;
 530 extern const struct dentry_operations ecryptfs_dops;
 531 extern const struct address_space_operations ecryptfs_aops;
 532 extern int ecryptfs_verbosity;
 533 extern unsigned int ecryptfs_message_buf_len;
 534 extern signed long ecryptfs_message_wait_timeout;
 535 extern unsigned int ecryptfs_number_of_users;
 536
 537 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
 538 extern struct kmem_cache *ecryptfs_file_info_cache;
 539 extern struct kmem_cache *ecryptfs_dentry_info_cache;
 540 extern struct kmem_cache *ecryptfs_inode_info_cache;
 541 extern struct kmem_cache *ecryptfs_sb_info_cache;
 542 extern struct kmem_cache *ecryptfs_header_cache;
 543 extern struct kmem_cache *ecryptfs_xattr_cache;
 544 extern struct kmem_cache *ecryptfs_key_record_cache;
 545 extern struct kmem_cache *ecryptfs_key_sig_cache;
 546 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
 547 extern struct kmem_cache *ecryptfs_key_tfm_cache;
 548 extern struct kmem_cache *ecryptfs_open_req_cache;
 549
 550 struct ecryptfs_open_req {
 551 #define ECRYPTFS_REQ_PROCESSED 0x00000001
 552 #define ECRYPTFS_REQ_DROPPED   0x00000002
 553 #define ECRYPTFS_REQ_ZOMBIE    0x00000004
 554         u32 flags;
 555         struct file **lower_file;
 556         struct dentry *lower_dentry;
 557         struct vfsmount *lower_mnt;
 558         wait_queue_head_t wait;
 559         struct mutex mux;
 560         struct list_head kthread_ctl_list;
 561 };
 562
 563 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 564                                  struct super_block *sb);
 565 void ecryptfs_i_size_init(const char *page_virt, struct inode *inode);
 566 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
 567                                          size_t *decrypted_name_size,
 568                                          struct dentry *ecryptfs_dentry,
 569                                          const char *name, size_t name_size);
 570 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
 571 int ecryptfs_encrypt_and_encode_filename(
 572         char **encoded_name,
 573         size_t *encoded_name_size,
 574         struct ecryptfs_crypt_stat *crypt_stat,
 575         struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 576         const char *name, size_t name_size);
 577 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
 578 void ecryptfs_dump_hex(char *data, int bytes);
 579 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
 580                         int sg_size);
 581 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
 582 void ecryptfs_rotate_iv(unsigned char *iv);
 583 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 584 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 585 void ecryptfs_destroy_mount_crypt_stat(
 586         struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 587 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
 588 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
 589 int ecryptfs_encrypt_page(struct page *page);
 590 int ecryptfs_decrypt_page(struct page *page);
 591 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
 592                             struct inode *ecryptfs_inode);
 593 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
 594 int ecryptfs_new_file_context(struct inode *ecryptfs_inode);
 595 void ecryptfs_write_crypt_stat_flags(char *page_virt,
 596                                      struct ecryptfs_crypt_stat *crypt_stat,
 597                                      size_t *written);
 598 int ecryptfs_read_and_validate_header_region(struct inode *inode);
 599 int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
 600                                             struct inode *inode);
 601 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
 602 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
 603 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
 604 int ecryptfs_generate_key_packet_set(char *dest_base,
 605                                      struct ecryptfs_crypt_stat *crypt_stat,
 606                                      struct dentry *ecryptfs_dentry,
 607                                      size_t *len, size_t max);
 608 int
 609 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
 610                           unsigned char *src, struct dentry *ecryptfs_dentry);
 611 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
 612 ssize_t
 613 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
 614                         void *value, size_t size);
 615 int
 616 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 617                   size_t size, int flags);
 618 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
 619 int ecryptfs_process_response(struct ecryptfs_daemon *daemon,
 620                               struct ecryptfs_message *msg, u32 seq);
 621 int ecryptfs_send_message(char *data, int data_len,
 622                           struct ecryptfs_msg_ctx **msg_ctx);
 623 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 624                                struct ecryptfs_message **emsg);
 625 int ecryptfs_init_messaging(void);
 626 void ecryptfs_release_messaging(void);
 627
 628 void
 629 ecryptfs_write_header_metadata(char *virt,
 630                                struct ecryptfs_crypt_stat *crypt_stat,
 631                                size_t *written);
 632 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
 633 int
 634 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 635                            char *sig, u32 global_auth_tok_flags);
 636 int ecryptfs_get_global_auth_tok_for_sig(
 637         struct ecryptfs_global_auth_tok **global_auth_tok,
 638         struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
 639 int
 640 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
 641                          size_t key_size);
 642 int ecryptfs_init_crypto(void);
 643 int ecryptfs_destroy_crypto(void);
 644 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
 645 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
 646                                                struct mutex **tfm_mutex,
 647                                                char *cipher_name);
 648 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 649                                       struct ecryptfs_auth_tok **auth_tok,
 650                                       char *sig);
 651 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
 652                          loff_t offset, size_t size);
 653 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
 654                                       struct page *page_for_lower,
 655                                       size_t offset_in_page, size_t size);
 656 int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size);
 657 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
 658                         struct inode *ecryptfs_inode);
 659 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
 660                                      pgoff_t page_index,
 661                                      size_t offset_in_page, size_t size,
 662                                      struct inode *ecryptfs_inode);
 663 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
 664 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
 665 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon);
 666 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
 667                                  size_t *length_size);
 668 int ecryptfs_write_packet_length(char *dest, size_t size,
 669                                  size_t *packet_size_length);
 670 int ecryptfs_init_ecryptfs_miscdev(void);
 671 void ecryptfs_destroy_ecryptfs_miscdev(void);
 672 int ecryptfs_send_miscdev(char *data, size_t data_size,
 673                           struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
 674                           u16 msg_flags, struct ecryptfs_daemon *daemon);
 675 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
 676 int
 677 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file);
 678 int ecryptfs_init_kthread(void);
 679 void ecryptfs_destroy_kthread(void);
 680 int ecryptfs_privileged_open(struct file **lower_file,
 681                              struct dentry *lower_dentry,
 682                              struct vfsmount *lower_mnt,
 683                              const struct cred *cred);
 684 int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode);
 685 void ecryptfs_put_lower_file(struct inode *inode);
 686 int
 687 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
 688                              size_t *packet_size,
 689                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 690                              char *filename, size_t filename_size);
 691 int
 692 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
 693                              size_t *packet_size,
 694                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 695                              char *data, size_t max_packet_size);
 696 int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
 697                            struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 698 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
 699                        loff_t offset);
 700
 701 #endif /* #ifndef ECRYPTFS_KERNEL_H */