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) 2004-2006 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_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
  51                                   | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
  52                                   | ECRYPTFS_VERSIONING_PUBKEY)
  53
  54 #define ECRYPTFS_MAX_PASSWORD_LENGTH 64
  55 #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
  56 #define ECRYPTFS_SALT_SIZE 8
  57 #define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
  58 /* The original signature size is only for what is stored on disk; all
  59  * in-memory representations are expanded hex, so it better adapted to
  60  * be passed around or referenced on the command line */
  61 #define ECRYPTFS_SIG_SIZE 8
  62 #define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
  63 #define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
  64 #define ECRYPTFS_MAX_KEY_BYTES 64
  65 #define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
  66 #define ECRYPTFS_DEFAULT_IV_BYTES 16
  67 #define ECRYPTFS_FILE_VERSION 0x02
  68 #define ECRYPTFS_DEFAULT_HEADER_EXTENT_SIZE 8192
  69 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
  70 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
  71 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
  72 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
  73 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
  74 #define ECRYPTFS_NLMSG_HELO 100
  75 #define ECRYPTFS_NLMSG_QUIT 101
  76 #define ECRYPTFS_NLMSG_REQUEST 102
  77 #define ECRYPTFS_NLMSG_RESPONSE 103
  78 #define ECRYPTFS_MAX_PKI_NAME_BYTES 16
  79 #define ECRYPTFS_DEFAULT_NUM_USERS 4
  80 #define ECRYPTFS_MAX_NUM_USERS 32768
  81 #define ECRYPTFS_TRANSPORT_NETLINK 0
  82 #define ECRYPTFS_TRANSPORT_CONNECTOR 1
  83 #define ECRYPTFS_TRANSPORT_RELAYFS 2
  84 #define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_NETLINK
  85
  86 #define RFC2440_CIPHER_DES3_EDE 0x02
  87 #define RFC2440_CIPHER_CAST_5 0x03
  88 #define RFC2440_CIPHER_BLOWFISH 0x04
  89 #define RFC2440_CIPHER_AES_128 0x07
  90 #define RFC2440_CIPHER_AES_192 0x08
  91 #define RFC2440_CIPHER_AES_256 0x09
  92 #define RFC2440_CIPHER_TWOFISH 0x0a
  93 #define RFC2440_CIPHER_CAST_6 0x0b
  94
  95 #define ECRYPTFS_SET_FLAG(flag_bit_vector, flag) (flag_bit_vector |= (flag))
  96 #define ECRYPTFS_CLEAR_FLAG(flag_bit_vector, flag) (flag_bit_vector &= ~(flag))
  97 #define ECRYPTFS_CHECK_FLAG(flag_bit_vector, flag) (flag_bit_vector & (flag))
  98 #define RFC2440_CIPHER_RSA 0x01
  99
 100 /**
 101  * For convenience, we may need to pass around the encrypted session
 102  * key between kernel and userspace because the authentication token
 103  * may not be extractable.  For example, the TPM may not release the
 104  * private key, instead requiring the encrypted data and returning the
 105  * decrypted data.
 106  */
 107 struct ecryptfs_session_key {
 108 #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001
 109 #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002
 110 #define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004
 111 #define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008
 112         u32 flags;
 113         u32 encrypted_key_size;
 114         u32 decrypted_key_size;
 115         u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
 116         u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];
 117 };
 118
 119 struct ecryptfs_password {
 120         u32 password_bytes;
 121         s32 hash_algo;
 122         u32 hash_iterations;
 123         u32 session_key_encryption_key_bytes;
 124 #define ECRYPTFS_PERSISTENT_PASSWORD 0x01
 125 #define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
 126         u32 flags;
 127         /* Iterated-hash concatenation of salt and passphrase */
 128         u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
 129         u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
 130         /* Always in expanded hex */
 131         u8 salt[ECRYPTFS_SALT_SIZE];
 132 };
 133
 134 enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};
 135
 136 struct ecryptfs_private_key {
 137         u32 key_size;
 138         u32 data_len;
 139         u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
 140         char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1];
 141         u8 data[];
 142 };
 143
 144 /* May be a password or a private key */
 145 struct ecryptfs_auth_tok {
 146         u16 version; /* 8-bit major and 8-bit minor */
 147         u16 token_type;
 148         u32 flags;
 149         struct ecryptfs_session_key session_key;
 150         u8 reserved[32];
 151         union {
 152                 struct ecryptfs_password password;
 153                 struct ecryptfs_private_key private_key;
 154         } token;
 155 } __attribute__ ((packed));
 156
 157 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
 158 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
 159 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
 160
 161 struct ecryptfs_key_record {
 162         unsigned char type;
 163         size_t enc_key_size;
 164         unsigned char sig[ECRYPTFS_SIG_SIZE];
 165         unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
 166 };
 167
 168 struct ecryptfs_auth_tok_list {
 169         struct ecryptfs_auth_tok *auth_tok;
 170         struct list_head list;
 171 };
 172
 173 struct ecryptfs_crypt_stat;
 174 struct ecryptfs_mount_crypt_stat;
 175
 176 struct ecryptfs_page_crypt_context {
 177         struct page *page;
 178 #define ECRYPTFS_PREPARE_COMMIT_MODE 0
 179 #define ECRYPTFS_WRITEPAGE_MODE      1
 180         unsigned int mode;
 181         union {
 182                 struct file *lower_file;
 183                 struct writeback_control *wbc;
 184         } param;
 185 };
 186
 187 static inline struct ecryptfs_auth_tok *
 188 ecryptfs_get_key_payload_data(struct key *key)
 189 {
 190         return (struct ecryptfs_auth_tok *)
 191                 (((struct user_key_payload*)key->payload.data)->data);
 192 }
 193
 194 #define ECRYPTFS_SUPER_MAGIC 0xf15f
 195 #define ECRYPTFS_MAX_KEYSET_SIZE 1024
 196 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
 197 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64
 198 #define ECRYPTFS_MAX_NUM_KEYSIGS 2 /* TODO: Make this a linked list */
 199 #define ECRYPTFS_MAX_IV_BYTES 16        /* 128 bits */
 200 #define ECRYPTFS_SALT_BYTES 2
 201 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
 202 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8      /* 4*2 */
 203 #define ECRYPTFS_FILE_SIZE_BYTES 8
 204 #define ECRYPTFS_DEFAULT_CIPHER "aes"
 205 #define ECRYPTFS_DEFAULT_KEY_BYTES 16
 206 #define ECRYPTFS_DEFAULT_HASH "md5"
 207 #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
 208 #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
 209 #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
 210 #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
 211 #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
 212 #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
 213 #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
 214 #define MD5_DIGEST_SIZE 16
 215
 216 /**
 217  * This is the primary struct associated with each encrypted file.
 218  *
 219  * TODO: cache align/pack?
 220  */
 221 struct ecryptfs_crypt_stat {
 222 #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001
 223 #define ECRYPTFS_POLICY_APPLIED     0x00000002
 224 #define ECRYPTFS_NEW_FILE           0x00000004
 225 #define ECRYPTFS_ENCRYPTED          0x00000008
 226 #define ECRYPTFS_SECURITY_WARNING   0x00000010
 227 #define ECRYPTFS_ENABLE_HMAC        0x00000020
 228 #define ECRYPTFS_ENCRYPT_IV_PAGES   0x00000040
 229 #define ECRYPTFS_KEY_VALID          0x00000080
 230         u32 flags;
 231         unsigned int file_version;
 232         size_t iv_bytes;
 233         size_t num_keysigs;
 234         size_t header_extent_size;
 235         size_t num_header_extents_at_front;
 236         size_t extent_size; /* Data extent size; default is 4096 */
 237         size_t key_size;
 238         size_t extent_shift;
 239         unsigned int extent_mask;
 240         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 241         struct crypto_blkcipher *tfm;
 242         struct crypto_hash *hash_tfm; /* Crypto context for generating
 243                                        * the initialization vectors */
 244         unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
 245         unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
 246         unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
 247         unsigned char keysigs[ECRYPTFS_MAX_NUM_KEYSIGS][ECRYPTFS_SIG_SIZE_HEX];
 248         struct mutex cs_tfm_mutex;
 249         struct mutex cs_hash_tfm_mutex;
 250         struct mutex cs_mutex;
 251 };
 252
 253 /* inode private data. */
 254 struct ecryptfs_inode_info {
 255         struct inode vfs_inode;
 256         struct inode *wii_inode;
 257         struct ecryptfs_crypt_stat crypt_stat;
 258 };
 259
 260 /* dentry private data. Each dentry must keep track of a lower
 261  * vfsmount too. */
 262 struct ecryptfs_dentry_info {
 263         struct path lower_path;
 264         struct ecryptfs_crypt_stat *crypt_stat;
 265 };
 266
 267 /**
 268  * This struct is to enable a mount-wide passphrase/salt combo. This
 269  * is more or less a stopgap to provide similar functionality to other
 270  * crypto filesystems like EncFS or CFS until full policy support is
 271  * implemented in eCryptfs.
 272  */
 273 struct ecryptfs_mount_crypt_stat {
 274         /* Pointers to memory we do not own, do not free these */
 275 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
 276         u32 flags;
 277         struct ecryptfs_auth_tok *global_auth_tok;
 278         struct key *global_auth_tok_key;
 279         size_t global_default_cipher_key_size;
 280         struct crypto_blkcipher *global_key_tfm;
 281         struct mutex global_key_tfm_mutex;
 282         unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
 283                                                  + 1];
 284         unsigned char global_auth_tok_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
 285 };
 286
 287 /* superblock private data. */
 288 struct ecryptfs_sb_info {
 289         struct super_block *wsi_sb;
 290         struct ecryptfs_mount_crypt_stat mount_crypt_stat;
 291 };
 292
 293 /* file private data. */
 294 struct ecryptfs_file_info {
 295         struct file *wfi_file;
 296         struct ecryptfs_crypt_stat *crypt_stat;
 297 };
 298
 299 /* auth_tok <=> encrypted_session_key mappings */
 300 struct ecryptfs_auth_tok_list_item {
 301         unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
 302         struct list_head list;
 303         struct ecryptfs_auth_tok auth_tok;
 304 };
 305
 306 struct ecryptfs_message {
 307         u32 index;
 308         u32 data_len;
 309         u8 data[];
 310 };
 311
 312 struct ecryptfs_msg_ctx {
 313 #define ECRYPTFS_MSG_CTX_STATE_FREE      0x0001
 314 #define ECRYPTFS_MSG_CTX_STATE_PENDING   0x0002
 315 #define ECRYPTFS_MSG_CTX_STATE_DONE      0x0003
 316         u32 state;
 317         unsigned int index;
 318         unsigned int counter;
 319         struct ecryptfs_message *msg;
 320         struct task_struct *task;
 321         struct list_head node;
 322         struct mutex mux;
 323 };
 324
 325 extern struct list_head ecryptfs_msg_ctx_free_list;
 326 extern struct list_head ecryptfs_msg_ctx_alloc_list;
 327 extern struct mutex ecryptfs_msg_ctx_lists_mux;
 328
 329 #define ecryptfs_uid_hash(uid) \
 330         hash_long((unsigned long)uid, ecryptfs_hash_buckets)
 331 extern struct hlist_head *ecryptfs_daemon_id_hash;
 332 extern struct mutex ecryptfs_daemon_id_hash_mux;
 333 extern int ecryptfs_hash_buckets;
 334
 335 extern unsigned int ecryptfs_msg_counter;
 336 extern struct ecryptfs_msg_ctx *ecryptfs_msg_ctx_arr;
 337 extern unsigned int ecryptfs_transport;
 338
 339 struct ecryptfs_daemon_id {
 340         pid_t pid;
 341         uid_t uid;
 342         struct hlist_node id_chain;
 343 };
 344
 345 static inline struct ecryptfs_file_info *
 346 ecryptfs_file_to_private(struct file *file)
 347 {
 348         return (struct ecryptfs_file_info *)file->private_data;
 349 }
 350
 351 static inline void
 352 ecryptfs_set_file_private(struct file *file,
 353                           struct ecryptfs_file_info *file_info)
 354 {
 355         file->private_data = file_info;
 356 }
 357
 358 static inline struct file *ecryptfs_file_to_lower(struct file *file)
 359 {
 360         return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
 361 }
 362
 363 static inline void
 364 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
 365 {
 366         ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
 367                 lower_file;
 368 }
 369
 370 static inline struct ecryptfs_inode_info *
 371 ecryptfs_inode_to_private(struct inode *inode)
 372 {
 373         return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
 374 }
 375
 376 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
 377 {
 378         return ecryptfs_inode_to_private(inode)->wii_inode;
 379 }
 380
 381 static inline void
 382 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
 383 {
 384         ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
 385 }
 386
 387 static inline struct ecryptfs_sb_info *
 388 ecryptfs_superblock_to_private(struct super_block *sb)
 389 {
 390         return (struct ecryptfs_sb_info *)sb->s_fs_info;
 391 }
 392
 393 static inline void
 394 ecryptfs_set_superblock_private(struct super_block *sb,
 395                                 struct ecryptfs_sb_info *sb_info)
 396 {
 397         sb->s_fs_info = sb_info;
 398 }
 399
 400 static inline struct super_block *
 401 ecryptfs_superblock_to_lower(struct super_block *sb)
 402 {
 403         return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
 404 }
 405
 406 static inline void
 407 ecryptfs_set_superblock_lower(struct super_block *sb,
 408                               struct super_block *lower_sb)
 409 {
 410         ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
 411 }
 412
 413 static inline struct ecryptfs_dentry_info *
 414 ecryptfs_dentry_to_private(struct dentry *dentry)
 415 {
 416         return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
 417 }
 418
 419 static inline void
 420 ecryptfs_set_dentry_private(struct dentry *dentry,
 421                             struct ecryptfs_dentry_info *dentry_info)
 422 {
 423         dentry->d_fsdata = dentry_info;
 424 }
 425
 426 static inline struct dentry *
 427 ecryptfs_dentry_to_lower(struct dentry *dentry)
 428 {
 429         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
 430 }
 431
 432 static inline void
 433 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
 434 {
 435         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
 436                 lower_dentry;
 437 }
 438
 439 static inline struct vfsmount *
 440 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
 441 {
 442         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
 443 }
 444
 445 static inline void
 446 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
 447 {
 448         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
 449                 lower_mnt;
 450 }
 451
 452 #define ecryptfs_printk(type, fmt, arg...) \
 453         __ecryptfs_printk(type "%s: " fmt, __FUNCTION__, ## arg);
 454 void __ecryptfs_printk(const char *fmt, ...);
 455
 456 extern const struct file_operations ecryptfs_main_fops;
 457 extern const struct file_operations ecryptfs_dir_fops;
 458 extern struct inode_operations ecryptfs_main_iops;
 459 extern struct inode_operations ecryptfs_dir_iops;
 460 extern struct inode_operations ecryptfs_symlink_iops;
 461 extern struct super_operations ecryptfs_sops;
 462 extern struct dentry_operations ecryptfs_dops;
 463 extern struct address_space_operations ecryptfs_aops;
 464 extern int ecryptfs_verbosity;
 465 extern unsigned int ecryptfs_message_buf_len;
 466 extern signed long ecryptfs_message_wait_timeout;
 467 extern unsigned int ecryptfs_number_of_users;
 468
 469 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
 470 extern struct kmem_cache *ecryptfs_file_info_cache;
 471 extern struct kmem_cache *ecryptfs_dentry_info_cache;
 472 extern struct kmem_cache *ecryptfs_inode_info_cache;
 473 extern struct kmem_cache *ecryptfs_sb_info_cache;
 474 extern struct kmem_cache *ecryptfs_header_cache_0;
 475 extern struct kmem_cache *ecryptfs_header_cache_1;
 476 extern struct kmem_cache *ecryptfs_header_cache_2;
 477 extern struct kmem_cache *ecryptfs_lower_page_cache;
 478
 479 int ecryptfs_interpose(struct dentry *hidden_dentry,
 480                        struct dentry *this_dentry, struct super_block *sb,
 481                        int flag);
 482 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
 483 int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat,
 484                              const char *name, int length,
 485                              char **decrypted_name);
 486 int ecryptfs_encode_filename(struct ecryptfs_crypt_stat *crypt_stat,
 487                              const char *name, int length,
 488                              char **encoded_name);
 489 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
 490 void ecryptfs_dump_hex(char *data, int bytes);
 491 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
 492                         int sg_size);
 493 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
 494 void ecryptfs_rotate_iv(unsigned char *iv);
 495 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 496 void ecryptfs_destruct_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
 497 void ecryptfs_destruct_mount_crypt_stat(
 498         struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
 499 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
 500 int ecryptfs_crypto_api_algify_cipher_name(char **algified_name,
 501                                            char *cipher_name,
 502                                            char *chaining_modifier);
 503 int ecryptfs_write_inode_size_to_header(struct file *lower_file,
 504                                         struct inode *lower_inode,
 505                                         struct inode *inode);
 506 int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
 507                             struct file *lower_file,
 508                             unsigned long lower_page_index, int byte_offset,
 509                             int region_bytes);
 510 int
 511 ecryptfs_commit_lower_page(struct page *lower_page, struct inode *lower_inode,
 512                            struct file *lower_file, int byte_offset,
 513                            int region_size);
 514 int ecryptfs_copy_page_to_lower(struct page *page, struct inode *lower_inode,
 515                                 struct file *lower_file);
 516 int ecryptfs_do_readpage(struct file *file, struct page *page,
 517                          pgoff_t lower_page_index);
 518 int ecryptfs_grab_and_map_lower_page(struct page **lower_page,
 519                                      char **lower_virt,
 520                                      struct inode *lower_inode,
 521                                      unsigned long lower_page_index);
 522 int ecryptfs_writepage_and_release_lower_page(struct page *lower_page,
 523                                               struct inode *lower_inode,
 524                                               struct writeback_control *wbc);
 525 int ecryptfs_encrypt_page(struct ecryptfs_page_crypt_context *ctx);
 526 int ecryptfs_decrypt_page(struct file *file, struct page *page);
 527 int ecryptfs_write_headers(struct dentry *ecryptfs_dentry,
 528                            struct file *lower_file);
 529 int ecryptfs_write_headers_virt(char *page_virt,
 530                                 struct ecryptfs_crypt_stat *crypt_stat,
 531                                 struct dentry *ecryptfs_dentry);
 532 int ecryptfs_read_headers(struct dentry *ecryptfs_dentry,
 533                           struct file *lower_file);
 534 int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
 535 int contains_ecryptfs_marker(char *data);
 536 int ecryptfs_read_header_region(char *data, struct dentry *dentry,
 537                                 struct vfsmount *mnt);
 538 u16 ecryptfs_code_for_cipher_string(struct ecryptfs_crypt_stat *crypt_stat);
 539 int ecryptfs_cipher_code_to_string(char *str, u16 cipher_code);
 540 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
 541 int ecryptfs_generate_key_packet_set(char *dest_base,
 542                                      struct ecryptfs_crypt_stat *crypt_stat,
 543                                      struct dentry *ecryptfs_dentry,
 544                                      size_t *len, size_t max);
 545 int process_request_key_err(long err_code);
 546 int
 547 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
 548                           unsigned char *src, struct dentry *ecryptfs_dentry);
 549 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
 550 int
 551 ecryptfs_process_cipher(struct crypto_blkcipher **key_tfm, char *cipher_name,
 552                         size_t *key_size);
 553 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
 554 int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
 555 void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
 556 int ecryptfs_open_lower_file(struct file **lower_file,
 557                              struct dentry *lower_dentry,
 558                              struct vfsmount *lower_mnt, int flags);
 559 int ecryptfs_close_lower_file(struct file *lower_file);
 560
 561 int ecryptfs_process_helo(unsigned int transport, uid_t uid, pid_t pid);
 562 int ecryptfs_process_quit(uid_t uid, pid_t pid);
 563 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t uid,
 564                               pid_t pid, u32 seq);
 565 int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
 566                           struct ecryptfs_msg_ctx **msg_ctx);
 567 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
 568                                struct ecryptfs_message **emsg);
 569 int ecryptfs_init_messaging(unsigned int transport);
 570 void ecryptfs_release_messaging(unsigned int transport);
 571
 572 int ecryptfs_send_netlink(char *data, int data_len,
 573                           struct ecryptfs_msg_ctx *msg_ctx, u16 msg_type,
 574                           u16 msg_flags, pid_t daemon_pid);
 575 int ecryptfs_init_netlink(void);
 576 void ecryptfs_release_netlink(void);
 577
 578 int ecryptfs_send_connector(char *data, int data_len,
 579                             struct ecryptfs_msg_ctx *msg_ctx, u16 msg_type,
 580                             u16 msg_flags, pid_t daemon_pid);
 581 int ecryptfs_init_connector(void);
 582 void ecryptfs_release_connector(void);
 583
 584
 585 #endif /* #ifndef ECRYPTFS_KERNEL_H */