ecryptfs_kernel.h 20 KB

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  1. /**
  2. * eCryptfs: Linux filesystem encryption layer
  3. * Kernel declarations.
  4. *
  5. * Copyright (C) 1997-2003 Erez Zadok
  6. * Copyright (C) 2001-2003 Stony Brook University
  7. * Copyright (C) 2004-2007 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. #ifndef ECRYPTFS_KERNEL_H
  28. #define ECRYPTFS_KERNEL_H
  29. #include <keys/user-type.h>
  30. #include <linux/fs.h>
  31. #include <linux/fs_stack.h>
  32. #include <linux/namei.h>
  33. #include <linux/scatterlist.h>
  34. #include <linux/hash.h>
  35. /* Version verification for shared data structures w/ userspace */
  36. #define ECRYPTFS_VERSION_MAJOR 0x00
  37. #define ECRYPTFS_VERSION_MINOR 0x04
  38. #define ECRYPTFS_SUPPORTED_FILE_VERSION 0x02
  39. /* These flags indicate which features are supported by the kernel
  40. * module; userspace tools such as the mount helper read
  41. * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine
  42. * how to behave. */
  43. #define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001
  44. #define ECRYPTFS_VERSIONING_PUBKEY 0x00000002
  45. #define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
  46. #define ECRYPTFS_VERSIONING_POLICY 0x00000008
  47. #define ECRYPTFS_VERSIONING_XATTR 0x00000010
  48. #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
  49. | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
  50. | ECRYPTFS_VERSIONING_PUBKEY \
  51. | ECRYPTFS_VERSIONING_XATTR)
  52. #define ECRYPTFS_MAX_PASSWORD_LENGTH 64
  53. #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
  54. #define ECRYPTFS_SALT_SIZE 8
  55. #define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
  56. /* The original signature size is only for what is stored on disk; all
  57. * in-memory representations are expanded hex, so it better adapted to
  58. * be passed around or referenced on the command line */
  59. #define ECRYPTFS_SIG_SIZE 8
  60. #define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
  61. #define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
  62. #define ECRYPTFS_MAX_KEY_BYTES 64
  63. #define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
  64. #define ECRYPTFS_DEFAULT_IV_BYTES 16
  65. #define ECRYPTFS_FILE_VERSION 0x02
  66. #define ECRYPTFS_DEFAULT_HEADER_EXTENT_SIZE 8192
  67. #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
  68. #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
  69. #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
  70. #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
  71. #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
  72. #define ECRYPTFS_NLMSG_HELO 100
  73. #define ECRYPTFS_NLMSG_QUIT 101
  74. #define ECRYPTFS_NLMSG_REQUEST 102
  75. #define ECRYPTFS_NLMSG_RESPONSE 103
  76. #define ECRYPTFS_MAX_PKI_NAME_BYTES 16
  77. #define ECRYPTFS_DEFAULT_NUM_USERS 4
  78. #define ECRYPTFS_MAX_NUM_USERS 32768
  79. #define ECRYPTFS_TRANSPORT_NETLINK 0
  80. #define ECRYPTFS_TRANSPORT_CONNECTOR 1
  81. #define ECRYPTFS_TRANSPORT_RELAYFS 2
  82. #define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_NETLINK
  83. #define ECRYPTFS_XATTR_NAME "user.ecryptfs"
  84. #define RFC2440_CIPHER_DES3_EDE 0x02
  85. #define RFC2440_CIPHER_CAST_5 0x03
  86. #define RFC2440_CIPHER_BLOWFISH 0x04
  87. #define RFC2440_CIPHER_AES_128 0x07
  88. #define RFC2440_CIPHER_AES_192 0x08
  89. #define RFC2440_CIPHER_AES_256 0x09
  90. #define RFC2440_CIPHER_TWOFISH 0x0a
  91. #define RFC2440_CIPHER_CAST_6 0x0b
  92. #define RFC2440_CIPHER_RSA 0x01
  93. /**
  94. * For convenience, we may need to pass around the encrypted session
  95. * key between kernel and userspace because the authentication token
  96. * may not be extractable. For example, the TPM may not release the
  97. * private key, instead requiring the encrypted data and returning the
  98. * decrypted data.
  99. */
  100. struct ecryptfs_session_key {
  101. #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001
  102. #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002
  103. #define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004
  104. #define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008
  105. u32 flags;
  106. u32 encrypted_key_size;
  107. u32 decrypted_key_size;
  108. u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
  109. u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];
  110. };
  111. struct ecryptfs_password {
  112. u32 password_bytes;
  113. s32 hash_algo;
  114. u32 hash_iterations;
  115. u32 session_key_encryption_key_bytes;
  116. #define ECRYPTFS_PERSISTENT_PASSWORD 0x01
  117. #define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
  118. u32 flags;
  119. /* Iterated-hash concatenation of salt and passphrase */
  120. u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
  121. u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
  122. /* Always in expanded hex */
  123. u8 salt[ECRYPTFS_SALT_SIZE];
  124. };
  125. enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};
  126. struct ecryptfs_private_key {
  127. u32 key_size;
  128. u32 data_len;
  129. u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
  130. char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1];
  131. u8 data[];
  132. };
  133. /* May be a password or a private key */
  134. struct ecryptfs_auth_tok {
  135. u16 version; /* 8-bit major and 8-bit minor */
  136. u16 token_type;
  137. u32 flags;
  138. struct ecryptfs_session_key session_key;
  139. u8 reserved[32];
  140. union {
  141. struct ecryptfs_password password;
  142. struct ecryptfs_private_key private_key;
  143. } token;
  144. } __attribute__ ((packed));
  145. void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
  146. extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
  147. extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
  148. struct ecryptfs_key_record {
  149. unsigned char type;
  150. size_t enc_key_size;
  151. unsigned char sig[ECRYPTFS_SIG_SIZE];
  152. unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
  153. };
  154. struct ecryptfs_auth_tok_list {
  155. struct ecryptfs_auth_tok *auth_tok;
  156. struct list_head list;
  157. };
  158. struct ecryptfs_crypt_stat;
  159. struct ecryptfs_mount_crypt_stat;
  160. struct ecryptfs_page_crypt_context {
  161. struct page *page;
  162. #define ECRYPTFS_PREPARE_COMMIT_MODE 0
  163. #define ECRYPTFS_WRITEPAGE_MODE 1
  164. unsigned int mode;
  165. union {
  166. struct file *lower_file;
  167. struct writeback_control *wbc;
  168. } param;
  169. };
  170. static inline struct ecryptfs_auth_tok *
  171. ecryptfs_get_key_payload_data(struct key *key)
  172. {
  173. return (struct ecryptfs_auth_tok *)
  174. (((struct user_key_payload*)key->payload.data)->data);
  175. }
  176. #define ECRYPTFS_SUPER_MAGIC 0xf15f
  177. #define ECRYPTFS_MAX_KEYSET_SIZE 1024
  178. #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
  179. #define ECRYPTFS_MAX_NUM_ENC_KEYS 64
  180. #define ECRYPTFS_MAX_NUM_KEYSIGS 2 /* TODO: Make this a linked list */
  181. #define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */
  182. #define ECRYPTFS_SALT_BYTES 2
  183. #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
  184. #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */
  185. #define ECRYPTFS_FILE_SIZE_BYTES 8
  186. #define ECRYPTFS_DEFAULT_CIPHER "aes"
  187. #define ECRYPTFS_DEFAULT_KEY_BYTES 16
  188. #define ECRYPTFS_DEFAULT_HASH "md5"
  189. #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
  190. #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
  191. #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
  192. #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
  193. #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
  194. #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
  195. #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
  196. #define MD5_DIGEST_SIZE 16
  197. /**
  198. * This is the primary struct associated with each encrypted file.
  199. *
  200. * TODO: cache align/pack?
  201. */
  202. struct ecryptfs_crypt_stat {
  203. #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001
  204. #define ECRYPTFS_POLICY_APPLIED 0x00000002
  205. #define ECRYPTFS_NEW_FILE 0x00000004
  206. #define ECRYPTFS_ENCRYPTED 0x00000008
  207. #define ECRYPTFS_SECURITY_WARNING 0x00000010
  208. #define ECRYPTFS_ENABLE_HMAC 0x00000020
  209. #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000040
  210. #define ECRYPTFS_KEY_VALID 0x00000080
  211. #define ECRYPTFS_METADATA_IN_XATTR 0x00000100
  212. #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000200
  213. u32 flags;
  214. unsigned int file_version;
  215. size_t iv_bytes;
  216. size_t num_keysigs;
  217. size_t header_extent_size;
  218. size_t num_header_extents_at_front;
  219. size_t extent_size; /* Data extent size; default is 4096 */
  220. size_t key_size;
  221. size_t extent_shift;
  222. unsigned int extent_mask;
  223. struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
  224. struct crypto_blkcipher *tfm;
  225. struct crypto_hash *hash_tfm; /* Crypto context for generating
  226. * the initialization vectors */
  227. unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
  228. unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
  229. unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
  230. unsigned char keysigs[ECRYPTFS_MAX_NUM_KEYSIGS][ECRYPTFS_SIG_SIZE_HEX];
  231. struct mutex cs_tfm_mutex;
  232. struct mutex cs_hash_tfm_mutex;
  233. struct mutex cs_mutex;
  234. };
  235. /* inode private data. */
  236. struct ecryptfs_inode_info {
  237. struct inode vfs_inode;
  238. struct inode *wii_inode;
  239. struct ecryptfs_crypt_stat crypt_stat;
  240. };
  241. /* dentry private data. Each dentry must keep track of a lower
  242. * vfsmount too. */
  243. struct ecryptfs_dentry_info {
  244. struct path lower_path;
  245. struct ecryptfs_crypt_stat *crypt_stat;
  246. };
  247. /**
  248. * This struct is to enable a mount-wide passphrase/salt combo. This
  249. * is more or less a stopgap to provide similar functionality to other
  250. * crypto filesystems like EncFS or CFS until full policy support is
  251. * implemented in eCryptfs.
  252. */
  253. struct ecryptfs_mount_crypt_stat {
  254. /* Pointers to memory we do not own, do not free these */
  255. #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
  256. #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002
  257. #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004
  258. u32 flags;
  259. struct ecryptfs_auth_tok *global_auth_tok;
  260. struct key *global_auth_tok_key;
  261. size_t global_default_cipher_key_size;
  262. struct crypto_blkcipher *global_key_tfm;
  263. struct mutex global_key_tfm_mutex;
  264. unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
  265. + 1];
  266. unsigned char global_auth_tok_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
  267. };
  268. /* superblock private data. */
  269. struct ecryptfs_sb_info {
  270. struct super_block *wsi_sb;
  271. struct ecryptfs_mount_crypt_stat mount_crypt_stat;
  272. };
  273. /* file private data. */
  274. struct ecryptfs_file_info {
  275. struct file *wfi_file;
  276. struct ecryptfs_crypt_stat *crypt_stat;
  277. };
  278. /* auth_tok <=> encrypted_session_key mappings */
  279. struct ecryptfs_auth_tok_list_item {
  280. unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
  281. struct list_head list;
  282. struct ecryptfs_auth_tok auth_tok;
  283. };
  284. struct ecryptfs_message {
  285. u32 index;
  286. u32 data_len;
  287. u8 data[];
  288. };
  289. struct ecryptfs_msg_ctx {
  290. #define ECRYPTFS_MSG_CTX_STATE_FREE 0x0001
  291. #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x0002
  292. #define ECRYPTFS_MSG_CTX_STATE_DONE 0x0003
  293. u32 state;
  294. unsigned int index;
  295. unsigned int counter;
  296. struct ecryptfs_message *msg;
  297. struct task_struct *task;
  298. struct list_head node;
  299. struct mutex mux;
  300. };
  301. extern unsigned int ecryptfs_transport;
  302. struct ecryptfs_daemon_id {
  303. pid_t pid;
  304. uid_t uid;
  305. struct hlist_node id_chain;
  306. };
  307. static inline struct ecryptfs_file_info *
  308. ecryptfs_file_to_private(struct file *file)
  309. {
  310. return (struct ecryptfs_file_info *)file->private_data;
  311. }
  312. static inline void
  313. ecryptfs_set_file_private(struct file *file,
  314. struct ecryptfs_file_info *file_info)
  315. {
  316. file->private_data = file_info;
  317. }
  318. static inline struct file *ecryptfs_file_to_lower(struct file *file)
  319. {
  320. return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
  321. }
  322. static inline void
  323. ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
  324. {
  325. ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
  326. lower_file;
  327. }
  328. static inline struct ecryptfs_inode_info *
  329. ecryptfs_inode_to_private(struct inode *inode)
  330. {
  331. return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
  332. }
  333. static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
  334. {
  335. return ecryptfs_inode_to_private(inode)->wii_inode;
  336. }
  337. static inline void
  338. ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
  339. {
  340. ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
  341. }
  342. static inline struct ecryptfs_sb_info *
  343. ecryptfs_superblock_to_private(struct super_block *sb)
  344. {
  345. return (struct ecryptfs_sb_info *)sb->s_fs_info;
  346. }
  347. static inline void
  348. ecryptfs_set_superblock_private(struct super_block *sb,
  349. struct ecryptfs_sb_info *sb_info)
  350. {
  351. sb->s_fs_info = sb_info;
  352. }
  353. static inline struct super_block *
  354. ecryptfs_superblock_to_lower(struct super_block *sb)
  355. {
  356. return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
  357. }
  358. static inline void
  359. ecryptfs_set_superblock_lower(struct super_block *sb,
  360. struct super_block *lower_sb)
  361. {
  362. ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
  363. }
  364. static inline struct ecryptfs_dentry_info *
  365. ecryptfs_dentry_to_private(struct dentry *dentry)
  366. {
  367. return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
  368. }
  369. static inline void
  370. ecryptfs_set_dentry_private(struct dentry *dentry,
  371. struct ecryptfs_dentry_info *dentry_info)
  372. {
  373. dentry->d_fsdata = dentry_info;
  374. }
  375. static inline struct dentry *
  376. ecryptfs_dentry_to_lower(struct dentry *dentry)
  377. {
  378. return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
  379. }
  380. static inline void
  381. ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
  382. {
  383. ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
  384. lower_dentry;
  385. }
  386. static inline struct vfsmount *
  387. ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
  388. {
  389. return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
  390. }
  391. static inline void
  392. ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
  393. {
  394. ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
  395. lower_mnt;
  396. }
  397. #define ecryptfs_printk(type, fmt, arg...) \
  398. __ecryptfs_printk(type "%s: " fmt, __FUNCTION__, ## arg);
  399. void __ecryptfs_printk(const char *fmt, ...);
  400. extern const struct file_operations ecryptfs_main_fops;
  401. extern const struct file_operations ecryptfs_dir_fops;
  402. extern const struct inode_operations ecryptfs_main_iops;
  403. extern const struct inode_operations ecryptfs_dir_iops;
  404. extern const struct inode_operations ecryptfs_symlink_iops;
  405. extern const struct super_operations ecryptfs_sops;
  406. extern struct dentry_operations ecryptfs_dops;
  407. extern struct address_space_operations ecryptfs_aops;
  408. extern int ecryptfs_verbosity;
  409. extern unsigned int ecryptfs_message_buf_len;
  410. extern signed long ecryptfs_message_wait_timeout;
  411. extern unsigned int ecryptfs_number_of_users;
  412. extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
  413. extern struct kmem_cache *ecryptfs_file_info_cache;
  414. extern struct kmem_cache *ecryptfs_dentry_info_cache;
  415. extern struct kmem_cache *ecryptfs_inode_info_cache;
  416. extern struct kmem_cache *ecryptfs_sb_info_cache;
  417. extern struct kmem_cache *ecryptfs_header_cache_0;
  418. extern struct kmem_cache *ecryptfs_header_cache_1;
  419. extern struct kmem_cache *ecryptfs_header_cache_2;
  420. extern struct kmem_cache *ecryptfs_xattr_cache;
  421. extern struct kmem_cache *ecryptfs_lower_page_cache;
  422. extern struct kmem_cache *ecryptfs_key_record_cache;
  423. int ecryptfs_interpose(struct dentry *hidden_dentry,
  424. struct dentry *this_dentry, struct super_block *sb,
  425. int flag);
  426. int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
  427. int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat,
  428. const char *name, int length,
  429. char **decrypted_name);
  430. int ecryptfs_encode_filename(struct ecryptfs_crypt_stat *crypt_stat,
  431. const char *name, int length,
  432. char **encoded_name);
  433. struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
  434. void ecryptfs_dump_hex(char *data, int bytes);
  435. int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
  436. int sg_size);
  437. int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
  438. void ecryptfs_rotate_iv(unsigned char *iv);
  439. void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
  440. void ecryptfs_destruct_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
  441. void ecryptfs_destruct_mount_crypt_stat(
  442. struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
  443. int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
  444. int ecryptfs_crypto_api_algify_cipher_name(char **algified_name,
  445. char *cipher_name,
  446. char *chaining_modifier);
  447. #define ECRYPTFS_LOWER_I_MUTEX_NOT_HELD 0
  448. #define ECRYPTFS_LOWER_I_MUTEX_HELD 1
  449. int ecryptfs_write_inode_size_to_metadata(struct file *lower_file,
  450. struct inode *lower_inode,
  451. struct inode *inode,
  452. struct dentry *ecryptfs_dentry,
  453. int lower_i_mutex_held);
  454. int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
  455. struct file *lower_file,
  456. unsigned long lower_page_index, int byte_offset,
  457. int region_bytes);
  458. int
  459. ecryptfs_commit_lower_page(struct page *lower_page, struct inode *lower_inode,
  460. struct file *lower_file, int byte_offset,
  461. int region_size);
  462. int ecryptfs_copy_page_to_lower(struct page *page, struct inode *lower_inode,
  463. struct file *lower_file);
  464. int ecryptfs_do_readpage(struct file *file, struct page *page,
  465. pgoff_t lower_page_index);
  466. int ecryptfs_writepage_and_release_lower_page(struct page *lower_page,
  467. struct inode *lower_inode,
  468. struct writeback_control *wbc);
  469. int ecryptfs_encrypt_page(struct ecryptfs_page_crypt_context *ctx);
  470. int ecryptfs_decrypt_page(struct file *file, struct page *page);
  471. int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
  472. struct file *lower_file);
  473. int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry,
  474. struct file *lower_file);
  475. int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
  476. int ecryptfs_read_and_validate_header_region(char *data, struct dentry *dentry,
  477. struct vfsmount *mnt);
  478. int ecryptfs_read_and_validate_xattr_region(char *page_virt,
  479. struct dentry *ecryptfs_dentry);
  480. u16 ecryptfs_code_for_cipher_string(struct ecryptfs_crypt_stat *crypt_stat);
  481. int ecryptfs_cipher_code_to_string(char *str, u16 cipher_code);
  482. void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
  483. int ecryptfs_generate_key_packet_set(char *dest_base,
  484. struct ecryptfs_crypt_stat *crypt_stat,
  485. struct dentry *ecryptfs_dentry,
  486. size_t *len, size_t max);
  487. int process_request_key_err(long err_code);
  488. int
  489. ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
  490. unsigned char *src, struct dentry *ecryptfs_dentry);
  491. int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
  492. int
  493. ecryptfs_process_cipher(struct crypto_blkcipher **key_tfm, char *cipher_name,
  494. size_t *key_size);
  495. int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
  496. int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
  497. void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
  498. int ecryptfs_open_lower_file(struct file **lower_file,
  499. struct dentry *lower_dentry,
  500. struct vfsmount *lower_mnt, int flags);
  501. int ecryptfs_close_lower_file(struct file *lower_file);
  502. ssize_t ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
  503. size_t size);
  504. int
  505. ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
  506. size_t size, int flags);
  507. int ecryptfs_read_xattr_region(char *page_virt, struct dentry *ecryptfs_dentry);
  508. int ecryptfs_process_helo(unsigned int transport, uid_t uid, pid_t pid);
  509. int ecryptfs_process_quit(uid_t uid, pid_t pid);
  510. int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t uid,
  511. pid_t pid, u32 seq);
  512. int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
  513. struct ecryptfs_msg_ctx **msg_ctx);
  514. int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
  515. struct ecryptfs_message **emsg);
  516. int ecryptfs_init_messaging(unsigned int transport);
  517. void ecryptfs_release_messaging(unsigned int transport);
  518. int ecryptfs_send_netlink(char *data, int data_len,
  519. struct ecryptfs_msg_ctx *msg_ctx, u16 msg_type,
  520. u16 msg_flags, pid_t daemon_pid);
  521. int ecryptfs_init_netlink(void);
  522. void ecryptfs_release_netlink(void);
  523. int ecryptfs_send_connector(char *data, int data_len,
  524. struct ecryptfs_msg_ctx *msg_ctx, u16 msg_type,
  525. u16 msg_flags, pid_t daemon_pid);
  526. int ecryptfs_init_connector(void);
  527. void ecryptfs_release_connector(void);
  528. void
  529. ecryptfs_write_header_metadata(char *virt,
  530. struct ecryptfs_crypt_stat *crypt_stat,
  531. size_t *written);
  532. #endif /* #ifndef ECRYPTFS_KERNEL_H */