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) 2004-2007 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 <linux/fs.h>
  33 #include <linux/fs_stack.h>
  34 #include <linux/namei.h>
  35 #include <linux/scatterlist.h>
  36 #include <linux/hash.h>
  37
  38 /* Version verification for shared data structures w/ userspace */
  39 #define ECRYPTFS_VERSION_MAJOR 0x00
  40 #define ECRYPTFS_VERSION_MINOR 0x04
  41 #define ECRYPTFS_SUPPORTED_FILE_VERSION 0x02
  42 /* These flags indicate which features are supported by the kernel
  43  * module; userspace tools such as the mount helper read
  44  * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine
  45  * how to behave. */
  46 #define ECRYPTFS_VERSIONING_PASSPHRASE            0x00000001
  47 #define ECRYPTFS_VERSIONING_PUBKEY                0x00000002
  48 #define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
  49 #define ECRYPTFS_VERSIONING_POLICY                0x00000008
  50 #define ECRYPTFS_VERSIONING_XATTR                 0x00000010
  51 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
  52                                   | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
  53                                   | ECRYPTFS_VERSIONING_PUBKEY \
  54                                   | ECRYPTFS_VERSIONING_XATTR)
  55 #define ECRYPTFS_MAX_PASSWORD_LENGTH 64
  56 #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
  57 #define ECRYPTFS_SALT_SIZE 8
  58 #define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
  59 /* The original signature size is only for what is stored on disk; all
  60  * in-memory representations are expanded hex, so it better adapted to
  61  * be passed around or referenced on the command line */
  62 #define ECRYPTFS_SIG_SIZE 8
  63 #define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
  64 #define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
  65 #define ECRYPTFS_MAX_KEY_BYTES 64
  66 #define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
  67 #define ECRYPTFS_DEFAULT_IV_BYTES 16
  68 #define ECRYPTFS_FILE_VERSION 0x02
  69 #define ECRYPTFS_DEFAULT_HEADER_EXTENT_SIZE 8192
  70 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
  71 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
  72 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
  73 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
  74 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
  75 #define ECRYPTFS_NLMSG_HELO 100
  76 #define ECRYPTFS_NLMSG_QUIT 101
  77 #define ECRYPTFS_NLMSG_REQUEST 102
  78 #define ECRYPTFS_NLMSG_RESPONSE 103
  79 #define ECRYPTFS_MAX_PKI_NAME_BYTES 16
  80 #define ECRYPTFS_DEFAULT_NUM_USERS 4
  81 #define ECRYPTFS_MAX_NUM_USERS 32768
  82 #define ECRYPTFS_TRANSPORT_NETLINK 0
  83 #define ECRYPTFS_TRANSPORT_CONNECTOR 1
  84 #define ECRYPTFS_TRANSPORT_RELAYFS 2
  85 #define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_NETLINK
  86 #define ECRYPTFS_XATTR_NAME "user.ecryptfs"
  87
  88 #define RFC2440_CIPHER_DES3_EDE 0x02
  89 #define RFC2440_CIPHER_CAST_5 0x03
  90 #define RFC2440_CIPHER_BLOWFISH 0x04
  91 #define RFC2440_CIPHER_AES_128 0x07
  92 #define RFC2440_CIPHER_AES_192 0x08
  93 #define RFC2440_CIPHER_AES_256 0x09
  94 #define RFC2440_CIPHER_TWOFISH 0x0a
  95 #define RFC2440_CIPHER_CAST_6 0x0b
  96
  97 #define RFC2440_CIPHER_RSA 0x01
  98
  99 /**
 100  * For convenience, we may need to pass around the encrypted session
 101  * key between kernel and userspace because the authentication token
 102  * may not be extractable.  For example, the TPM may not release the
 103  * private key, instead requiring the encrypted data and returning the
 104  * decrypted data.
 105  */
 106 struct ecryptfs_session_key {
 107 #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001
 108 #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002
 109 #define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004
 110 #define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008
 111         u32 flags;
 112         u32 encrypted_key_size;
 113         u32 decrypted_key_size;
 114         u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
 115         u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];
 116 };
 117
 118 struct ecryptfs_password {
 119         u32 password_bytes;
 120         s32 hash_algo;
 121         u32 hash_iterations;
 122         u32 session_key_encryption_key_bytes;
 123 #define ECRYPTFS_PERSISTENT_PASSWORD 0x01
 124 #define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
 125         u32 flags;
 126         /* Iterated-hash concatenation of salt and passphrase */
 127         u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
 128         u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
 129         /* Always in expanded hex */
 130         u8 salt[ECRYPTFS_SALT_SIZE];
 131 };
 132
 133 enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};
 134
 135 struct ecryptfs_private_key {
 136         u32 key_size;
 137         u32 data_len;
 138         u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
 139         char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1];
 140         u8 data[];
 141 };
 142
 143 /* May be a password or a private key */
 144 struct ecryptfs_auth_tok {
 145         u16 version; /* 8-bit major and 8-bit minor */
 146         u16 token_type;
 147         u32 flags;
 148         struct ecryptfs_session_key session_key;
 149         u8 reserved[32];
 150         union {
 151                 struct ecryptfs_password password;
 152                 struct ecryptfs_private_key private_key;
 153         } token;
 154 } __attribute__ ((packed));
 155
 156 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
 157 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
 158 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
 159
 160 struct ecryptfs_key_record {
 161         unsigned char type;
 162         size_t enc_key_size;
 163         unsigned char sig[ECRYPTFS_SIG_SIZE];
 164         unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
 165 };
 166
 167 struct ecryptfs_auth_tok_list {
 168         struct ecryptfs_auth_tok *auth_tok;
 169         struct list_head list;
 170 };
 171
 172 struct ecryptfs_crypt_stat;
 173 struct ecryptfs_mount_crypt_stat;
 174
 175 struct ecryptfs_page_crypt_context {
 176         struct page *page;
 177 #define ECRYPTFS_PREPARE_COMMIT_MODE 0
 178 #define ECRYPTFS_WRITEPAGE_MODE      1
 179         unsigned int mode;
 180         union {
 181                 struct file *lower_file;
 182                 struct writeback_control *wbc;
 183         } param;
 184 };
 185
 186 static inline struct ecryptfs_auth_tok *
 187 ecryptfs_get_key_payload_data(struct key *key)
 188 {
 189         return (struct ecryptfs_auth_tok *)
 190                 (((struct user_key_payload*)key->payload.data)->data);
 191 }
 192
 193 #define ECRYPTFS_SUPER_MAGIC 0xf15f
 194 #define ECRYPTFS_MAX_KEYSET_SIZE 1024
 195 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
 196 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64
 197 #define ECRYPTFS_MAX_NUM_KEYSIGS 2 /* TODO: Make this a linked list */
 198 #define ECRYPTFS_MAX_IV_BYTES 16        /* 128 bits */
 199 #define ECRYPTFS_SALT_BYTES 2
 200 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
 201 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8      /* 4*2 */
 202 #define ECRYPTFS_FILE_SIZE_BYTES 8
 203 #define ECRYPTFS_DEFAULT_CIPHER "aes"
 204 #define ECRYPTFS_DEFAULT_KEY_BYTES 16
 205 #define ECRYPTFS_DEFAULT_HASH "md5"
 206 #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
 207 #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
 208 #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
 209 #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
 210 #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
 211 #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
 212 #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
 213 #define MD5_DIGEST_SIZE 16
 214
 215 /**
 216  * This is the primary struct associated with each encrypted file.
 217  *
 218  * TODO: cache align/pack?
 219  */
 220 struct ecryptfs_crypt_stat {
 221 #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001
 222 #define ECRYPTFS_POLICY_APPLIED     0x00000002
 223 #define ECRYPTFS_NEW_FILE           0x00000004
 224 #define ECRYPTFS_ENCRYPTED          0x00000008
 225 #define ECRYPTFS_SECURITY_WARNING   0x00000010
 226 #define ECRYPTFS_ENABLE_HMAC        0x00000020
 227 #define ECRYPTFS_ENCRYPT_IV_PAGES   0x00000040
 228 #define ECRYPTFS_KEY_VALID          0x00000080
 229 #define ECRYPTFS_METADATA_IN_XATTR  0x00000100
 230 #define ECRYPTFS_VIEW_AS_ENCRYPTED  0x00000200
 231         u32 flags;
 232         unsigned int file_version;
 233         size_t iv_bytes;
 234         size_t num_keysigs;
 235         size_t header_extent_size;
 236         size_t num_header_extents_at_front;
 237         size_t extent_size; /* Data extent size; default is 4096 */
 238         size_t key_size;
 239         size_t extent_shift;
 240         unsigned int extent_mask;
 241         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 242         struct crypto_blkcipher *tfm;
 243         struct crypto_hash *hash_tfm; /* Crypto context for generating
 244                                        * the initialization vectors */
 245         unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
 246         unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
 247         unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
 248         unsigned char keysigs[ECRYPTFS_MAX_NUM_KEYSIGS][ECRYPTFS_SIG_SIZE_HEX];
 249         struct mutex cs_tfm_mutex;
 250         struct mutex cs_hash_tfm_mutex;
 251         struct mutex cs_mutex;
 252 };
 253
 254 /* inode private data. */
 255 struct ecryptfs_inode_info {
 256         struct inode vfs_inode;
 257         struct inode *wii_inode;
 258         struct ecryptfs_crypt_stat crypt_stat;
 259 };
 260
 261 /* dentry private data. Each dentry must keep track of a lower
 262  * vfsmount too. */
 263 struct ecryptfs_dentry_info {
 264         struct path lower_path;
 265         struct ecryptfs_crypt_stat *crypt_stat;
 266 };
 267
 268 /**
 269  * This struct is to enable a mount-wide passphrase/salt combo. This
 270  * is more or less a stopgap to provide similar functionality to other
 271  * crypto filesystems like EncFS or CFS until full policy support is
 272  * implemented in eCryptfs.
 273  */
 274 struct ecryptfs_mount_crypt_stat {
 275         /* Pointers to memory we do not own, do not free these */
 276 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
 277 #define ECRYPTFS_XATTR_METADATA_ENABLED        0x00000002
 278 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED        0x00000004
 279         u32 flags;
 280         struct ecryptfs_auth_tok *global_auth_tok;
 281         struct key *global_auth_tok_key;
 282         size_t global_default_cipher_key_size;
 283         struct crypto_blkcipher *global_key_tfm;
 284         struct mutex global_key_tfm_mutex;
 285         unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
 286                                                  + 1];
 287         unsigned char global_auth_tok_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
 288 };
 289
 290 /* superblock private data. */
 291 struct ecryptfs_sb_info {
 292         struct super_block *wsi_sb;
 293         struct ecryptfs_mount_crypt_stat mount_crypt_stat;
 294 };
 295
 296 /* file private data. */
 297 struct ecryptfs_file_info {
 298         struct file *wfi_file;
 299         struct ecryptfs_crypt_stat *crypt_stat;
 300 };
 301
 302 /* auth_tok <=> encrypted_session_key mappings */
 303 struct ecryptfs_auth_tok_list_item {
 304         unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
 305         struct list_head list;
 306         struct ecryptfs_auth_tok auth_tok;
 307 };
 308
 309 struct ecryptfs_message {
 310         u32 index;
 311         u32 data_len;
 312         u8 data[];
 313 };
 314
 315 struct ecryptfs_msg_ctx {
 316 #define ECRYPTFS_MSG_CTX_STATE_FREE      0x0001
 317 #define ECRYPTFS_MSG_CTX_STATE_PENDING   0x0002
 318 #define ECRYPTFS_MSG_CTX_STATE_DONE      0x0003
 319         u32 state;
 320         unsigned int index;
 321         unsigned int counter;
 322         struct ecryptfs_message *msg;
 323         struct task_struct *task;
 324         struct list_head node;
 325         struct mutex mux;
 326 };
 327
 328 extern unsigned int ecryptfs_transport;
 329
 330 struct ecryptfs_daemon_id {
 331         pid_t pid;
 332         uid_t uid;
 333         struct hlist_node id_chain;
 334 };
 335
 336 static inline struct ecryptfs_file_info *
 337 ecryptfs_file_to_private(struct file *file)
 338 {
 339         return (struct ecryptfs_file_info *)file->private_data;
 340 }
 341
 342 static inline void
 343 ecryptfs_set_file_private(struct file *file,
 344                           struct ecryptfs_file_info *file_info)
 345 {
 346         file->private_data = file_info;
 347 }
 348
 349 static inline struct file *ecryptfs_file_to_lower(struct file *file)
 350 {
 351         return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
 352 }
 353
 354 static inline void
 355 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
 356 {
 357         ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
 358                 lower_file;
 359 }
 360
 361 static inline struct ecryptfs_inode_info *
 362 ecryptfs_inode_to_private(struct inode *inode)
 363 {
 364         return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
 365 }
 366
 367 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
 368 {
 369         return ecryptfs_inode_to_private(inode)->wii_inode;
 370 }
 371
 372 static inline void
 373 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
 374 {
 375         ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
 376 }
 377
 378 static inline struct ecryptfs_sb_info *
 379 ecryptfs_superblock_to_private(struct super_block *sb)
 380 {
 381         return (struct ecryptfs_sb_info *)sb->s_fs_info;
 382 }
 383
 384 static inline void
 385 ecryptfs_set_superblock_private(struct super_block *sb,
 386                                 struct ecryptfs_sb_info *sb_info)
 387 {
 388         sb->s_fs_info = sb_info;
 389 }
 390
 391 static inline struct super_block *
 392 ecryptfs_superblock_to_lower(struct super_block *sb)
 393 {
 394         return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
 395 }
 396
 397 static inline void
 398 ecryptfs_set_superblock_lower(struct super_block *sb,
 399                               struct super_block *lower_sb)
 400 {
 401         ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
 402 }
 403
 404 static inline struct ecryptfs_dentry_info *
 405 ecryptfs_dentry_to_private(struct dentry *dentry)
 406 {
 407         return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
 408 }
 409
 410 static inline void
 411 ecryptfs_set_dentry_private(struct dentry *dentry,
 412                             struct ecryptfs_dentry_info *dentry_info)
 413 {
 414         dentry->d_fsdata = dentry_info;
 415 }
 416
 417 static inline struct dentry *
 418 ecryptfs_dentry_to_lower(struct dentry *dentry)
 419 {
 420         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
 421 }
 422
 423 static inline void
 424 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
 425 {
 426         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
 427                 lower_dentry;
 428 }
 429
 430 static inline struct vfsmount *
 431 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
 432 {
 433         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
 434 }
 435
 436 static inline void
 437 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
 438 {
 439         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
 440                 lower_mnt;
 441 }
 442
 443 #define ecryptfs_printk(type, fmt, arg...) \
 444         __ecryptfs_printk(type "%s: " fmt, __FUNCTION__, ## arg);
 445 void __ecryptfs_printk(const char *fmt, ...);
 446
 447 extern const struct file_operations ecryptfs_main_fops;
 448 extern const struct file_operations ecryptfs_dir_fops;
 449 extern const struct inode_operations ecryptfs_main_iops;
 450 extern const struct inode_operations ecryptfs_dir_iops;
 451 extern const struct inode_operations ecryptfs_symlink_iops;
 452 extern const struct super_operations ecryptfs_sops;
 453 extern struct dentry_operations ecryptfs_dops;
 454 extern struct address_space_operations ecryptfs_aops;
 455 extern int ecryptfs_verbosity;
 456 extern unsigned int ecryptfs_message_buf_len;
 457 extern signed long ecryptfs_message_wait_timeout;
 458 extern unsigned int ecryptfs_number_of_users;
 459
 460 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
 461 extern struct kmem_cache *ecryptfs_file_info_cache;
 462 extern struct kmem_cache *ecryptfs_dentry_info_cache;
 463 extern struct kmem_cache *ecryptfs_inode_info_cache;
 464 extern struct kmem_cache *ecryptfs_sb_info_cache;
 465 extern struct kmem_cache *ecryptfs_header_cache_0;
 466 extern struct kmem_cache *ecryptfs_header_cache_1;
 467 extern struct kmem_cache *ecryptfs_header_cache_2;
 468 extern struct kmem_cache *ecryptfs_xattr_cache;
 469 extern struct kmem_cache *ecryptfs_lower_page_cache;
 470 extern struct kmem_cache *ecryptfs_key_record_cache;
 471
 472 int ecryptfs_interpose(struct dentry *hidden_dentry,
 473                        struct dentry *this_dentry, struct super_block *sb,
 474                        int flag);
 475 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
 476 int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat,
 477                              const char *name, int length,
 478                              char **decrypted_name);
 479 int ecryptfs_encode_filename(struct ecryptfs_crypt_stat *crypt_stat,
 480                              const char *name, int length,
 481                              char **encoded_name);
 482 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
 483 void ecryptfs_dump_hex(char *data, int bytes);
 484 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
 485                         int sg_size);
 486 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
 487 void ecryptfs_rotate_iv(unsigned char *iv);
 488 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 489 void ecryptfs_destruct_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 490 void ecryptfs_destruct_mount_crypt_stat(
 491         struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 492 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
 493 int ecryptfs_crypto_api_algify_cipher_name(char **algified_name,
 494                                            char *cipher_name,
 495                                            char *chaining_modifier);
 496 #define ECRYPTFS_LOWER_I_MUTEX_NOT_HELD 0
 497 #define ECRYPTFS_LOWER_I_MUTEX_HELD 1
 498 int ecryptfs_write_inode_size_to_metadata(struct file *lower_file,
 499                                           struct inode *lower_inode,
 500                                           struct inode *inode,
 501                                           struct dentry *ecryptfs_dentry,
 502                                           int lower_i_mutex_held);
 503 int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
 504                             struct file *lower_file,
 505                             unsigned long lower_page_index, int byte_offset,
 506                             int region_bytes);
 507 int
 508 ecryptfs_commit_lower_page(struct page *lower_page, struct inode *lower_inode,
 509                            struct file *lower_file, int byte_offset,
 510                            int region_size);
 511 int ecryptfs_copy_page_to_lower(struct page *page, struct inode *lower_inode,
 512                                 struct file *lower_file);
 513 int ecryptfs_do_readpage(struct file *file, struct page *page,
 514                          pgoff_t lower_page_index);
 515 int ecryptfs_writepage_and_release_lower_page(struct page *lower_page,
 516                                               struct inode *lower_inode,
 517                                               struct writeback_control *wbc);
 518 int ecryptfs_encrypt_page(struct ecryptfs_page_crypt_context *ctx);
 519 int ecryptfs_decrypt_page(struct file *file, struct page *page);
 520 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
 521                             struct file *lower_file);
 522 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry,
 523                            struct file *lower_file);
 524 int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
 525 int ecryptfs_read_and_validate_header_region(char *data, struct dentry *dentry,
 526                                              struct vfsmount *mnt);
 527 int ecryptfs_read_and_validate_xattr_region(char *page_virt,
 528                                             struct dentry *ecryptfs_dentry);
 529 u16 ecryptfs_code_for_cipher_string(struct ecryptfs_crypt_stat *crypt_stat);
 530 int ecryptfs_cipher_code_to_string(char *str, u16 cipher_code);
 531 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
 532 int ecryptfs_generate_key_packet_set(char *dest_base,
 533                                      struct ecryptfs_crypt_stat *crypt_stat,
 534                                      struct dentry *ecryptfs_dentry,
 535                                      size_t *len, size_t max);
 536 int process_request_key_err(long err_code);
 537 int
 538 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
 539                           unsigned char *src, struct dentry *ecryptfs_dentry);
 540 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
 541 int
 542 ecryptfs_process_cipher(struct crypto_blkcipher **key_tfm, char *cipher_name,
 543                         size_t *key_size);
 544 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
 545 int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
 546 void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
 547 int ecryptfs_open_lower_file(struct file **lower_file,
 548                              struct dentry *lower_dentry,
 549                              struct vfsmount *lower_mnt, int flags);
 550 int ecryptfs_close_lower_file(struct file *lower_file);
 551 ssize_t ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
 552                           size_t size);
 553 int
 554 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 555                   size_t size, int flags);
 556 int ecryptfs_read_xattr_region(char *page_virt, struct dentry *ecryptfs_dentry);
 557 int ecryptfs_process_helo(unsigned int transport, uid_t uid, pid_t pid);
 558 int ecryptfs_process_quit(uid_t uid, pid_t pid);
 559 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t uid,
 560                               pid_t pid, u32 seq);
 561 int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
 562                           struct ecryptfs_msg_ctx **msg_ctx);
 563 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 564                                struct ecryptfs_message **emsg);
 565 int ecryptfs_init_messaging(unsigned int transport);
 566 void ecryptfs_release_messaging(unsigned int transport);
 567
 568 int ecryptfs_send_netlink(char *data, int data_len,
 569                           struct ecryptfs_msg_ctx *msg_ctx, u16 msg_type,
 570                           u16 msg_flags, pid_t daemon_pid);
 571 int ecryptfs_init_netlink(void);
 572 void ecryptfs_release_netlink(void);
 573
 574 int ecryptfs_send_connector(char *data, int data_len,
 575                             struct ecryptfs_msg_ctx *msg_ctx, u16 msg_type,
 576                             u16 msg_flags, pid_t daemon_pid);
 577 int ecryptfs_init_connector(void);
 578 void ecryptfs_release_connector(void);
 579 void
 580 ecryptfs_write_header_metadata(char *virt,
 581                                struct ecryptfs_crypt_stat *crypt_stat,
 582                                size_t *written);
 583 int ecryptfs_write_zeros(struct file *file, pgoff_t index, int start,
 584                          int num_zeros);
 585
 586 #endif /* #ifndef ECRYPTFS_KERNEL_H */