2 * eCryptfs: Linux filesystem encryption layer
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>
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.
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.
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
28 #ifndef ECRYPTFS_KERNEL_H
29 #define ECRYPTFS_KERNEL_H
31 #include <keys/user-type.h>
33 #include <linux/fs_stack.h>
34 #include <linux/namei.h>
35 #include <linux/scatterlist.h>
36 #include <linux/hash.h>
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 0x03
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
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_MULTKEY 0x00000020
52 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
53 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
54 | ECRYPTFS_VERSIONING_PUBKEY \
55 | ECRYPTFS_VERSIONING_XATTR \
56 | ECRYPTFS_VERSIONING_MULTKEY)
57 #define ECRYPTFS_MAX_PASSWORD_LENGTH 64
58 #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
59 #define ECRYPTFS_SALT_SIZE 8
60 #define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
61 /* The original signature size is only for what is stored on disk; all
62 * in-memory representations are expanded hex, so it better adapted to
63 * be passed around or referenced on the command line */
64 #define ECRYPTFS_SIG_SIZE 8
65 #define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
66 #define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
67 #define ECRYPTFS_MAX_KEY_BYTES 64
68 #define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
69 #define ECRYPTFS_DEFAULT_IV_BYTES 16
70 #define ECRYPTFS_FILE_VERSION 0x03
71 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
72 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
73 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
74 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
75 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
76 #define ECRYPTFS_NLMSG_HELO 100
77 #define ECRYPTFS_NLMSG_QUIT 101
78 #define ECRYPTFS_NLMSG_REQUEST 102
79 #define ECRYPTFS_NLMSG_RESPONSE 103
80 #define ECRYPTFS_MAX_PKI_NAME_BYTES 16
81 #define ECRYPTFS_DEFAULT_NUM_USERS 4
82 #define ECRYPTFS_MAX_NUM_USERS 32768
83 #define ECRYPTFS_TRANSPORT_NETLINK 0
84 #define ECRYPTFS_TRANSPORT_CONNECTOR 1
85 #define ECRYPTFS_TRANSPORT_RELAYFS 2
86 #define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_NETLINK
87 #define ECRYPTFS_XATTR_NAME "user.ecryptfs"
89 #define RFC2440_CIPHER_DES3_EDE 0x02
90 #define RFC2440_CIPHER_CAST_5 0x03
91 #define RFC2440_CIPHER_BLOWFISH 0x04
92 #define RFC2440_CIPHER_AES_128 0x07
93 #define RFC2440_CIPHER_AES_192 0x08
94 #define RFC2440_CIPHER_AES_256 0x09
95 #define RFC2440_CIPHER_TWOFISH 0x0a
96 #define RFC2440_CIPHER_CAST_6 0x0b
98 #define RFC2440_CIPHER_RSA 0x01
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
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
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];
119 struct ecryptfs_password {
123 u32 session_key_encryption_key_bytes;
124 #define ECRYPTFS_PERSISTENT_PASSWORD 0x01
125 #define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
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];
134 enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};
136 struct ecryptfs_private_key {
139 u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
140 char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1];
144 /* May be a password or a private key */
145 struct ecryptfs_auth_tok {
146 u16 version; /* 8-bit major and 8-bit minor */
148 #define ECRYPTFS_ENCRYPT_ONLY 0x00000001
150 struct ecryptfs_session_key session_key;
153 struct ecryptfs_password password;
154 struct ecryptfs_private_key private_key;
156 } __attribute__ ((packed));
158 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
159 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
160 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
162 struct ecryptfs_key_record {
165 unsigned char sig[ECRYPTFS_SIG_SIZE];
166 unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
169 struct ecryptfs_auth_tok_list {
170 struct ecryptfs_auth_tok *auth_tok;
171 struct list_head list;
174 struct ecryptfs_crypt_stat;
175 struct ecryptfs_mount_crypt_stat;
177 struct ecryptfs_page_crypt_context {
179 #define ECRYPTFS_PREPARE_COMMIT_MODE 0
180 #define ECRYPTFS_WRITEPAGE_MODE 1
183 struct file *lower_file;
184 struct writeback_control *wbc;
188 static inline struct ecryptfs_auth_tok *
189 ecryptfs_get_key_payload_data(struct key *key)
191 return (struct ecryptfs_auth_tok *)
192 (((struct user_key_payload*)key->payload.data)->data);
195 #define ECRYPTFS_SUPER_MAGIC 0xf15f
196 #define ECRYPTFS_MAX_KEYSET_SIZE 1024
197 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
198 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64
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 (sizeof(u64))
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
216 struct ecryptfs_key_sig {
217 struct list_head crypt_stat_list;
218 char keysig[ECRYPTFS_SIG_SIZE_HEX];
222 * This is the primary struct associated with each encrypted file.
224 * TODO: cache align/pack?
226 struct ecryptfs_crypt_stat {
227 #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001
228 #define ECRYPTFS_POLICY_APPLIED 0x00000002
229 #define ECRYPTFS_NEW_FILE 0x00000004
230 #define ECRYPTFS_ENCRYPTED 0x00000008
231 #define ECRYPTFS_SECURITY_WARNING 0x00000010
232 #define ECRYPTFS_ENABLE_HMAC 0x00000020
233 #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000040
234 #define ECRYPTFS_KEY_VALID 0x00000080
235 #define ECRYPTFS_METADATA_IN_XATTR 0x00000100
236 #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000200
238 unsigned int file_version;
240 size_t num_header_extents_at_front;
241 size_t extent_size; /* Data extent size; default is 4096 */
244 unsigned int extent_mask;
245 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
246 struct crypto_blkcipher *tfm;
247 struct crypto_hash *hash_tfm; /* Crypto context for generating
248 * the initialization vectors */
249 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
250 unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
251 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
252 struct list_head keysig_list;
253 struct mutex keysig_list_mutex;
254 struct mutex cs_tfm_mutex;
255 struct mutex cs_hash_tfm_mutex;
256 struct mutex cs_mutex;
259 /* inode private data. */
260 struct ecryptfs_inode_info {
261 struct inode vfs_inode;
262 struct inode *wii_inode;
263 struct file *lower_file;
264 struct mutex lower_file_mutex;
265 struct ecryptfs_crypt_stat crypt_stat;
268 /* dentry private data. Each dentry must keep track of a lower
270 struct ecryptfs_dentry_info {
271 struct path lower_path;
272 struct ecryptfs_crypt_stat *crypt_stat;
276 * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
277 * @flags: Status flags
278 * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
279 * cryptographic context. Every time a new
280 * inode comes into existence, eCryptfs copies
281 * the auth_toks on that list to the set of
282 * auth_toks on the inode's crypt_stat
283 * @global_auth_tok_key: The key from the user's keyring for the sig
284 * @global_auth_tok: The key contents
285 * @sig: The key identifier
287 * ecryptfs_global_auth_tok structs refer to authentication token keys
288 * in the user keyring that apply to newly created files. A list of
289 * these objects hangs off of the mount_crypt_stat struct for any
290 * given eCryptfs mount. This struct maintains a reference to both the
291 * key contents and the key itself so that the key can be put on
294 struct ecryptfs_global_auth_tok {
295 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
297 struct list_head mount_crypt_stat_list;
298 struct key *global_auth_tok_key;
299 struct ecryptfs_auth_tok *global_auth_tok;
300 unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
304 * ecryptfs_key_tfm - Persistent key tfm
305 * @key_tfm: crypto API handle to the key
306 * @key_size: Key size in bytes
307 * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
308 * using the persistent TFM at any point in time
309 * @key_tfm_list: Handle to hang this off the module-wide TFM list
310 * @cipher_name: String name for the cipher for this TFM
312 * Typically, eCryptfs will use the same ciphers repeatedly throughout
313 * the course of its operations. In order to avoid unnecessarily
314 * destroying and initializing the same cipher repeatedly, eCryptfs
315 * keeps a list of crypto API contexts around to use when needed.
317 struct ecryptfs_key_tfm {
318 struct crypto_blkcipher *key_tfm;
320 struct mutex key_tfm_mutex;
321 struct list_head key_tfm_list;
322 unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
325 extern struct list_head key_tfm_list;
326 extern struct mutex key_tfm_list_mutex;
329 * This struct is to enable a mount-wide passphrase/salt combo. This
330 * is more or less a stopgap to provide similar functionality to other
331 * crypto filesystems like EncFS or CFS until full policy support is
332 * implemented in eCryptfs.
334 struct ecryptfs_mount_crypt_stat {
335 /* Pointers to memory we do not own, do not free these */
336 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
337 #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002
338 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004
339 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008
341 struct list_head global_auth_tok_list;
342 struct mutex global_auth_tok_list_mutex;
343 size_t num_global_auth_toks;
344 size_t global_default_cipher_key_size;
345 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
349 /* superblock private data. */
350 struct ecryptfs_sb_info {
351 struct super_block *wsi_sb;
352 struct ecryptfs_mount_crypt_stat mount_crypt_stat;
355 /* file private data. */
356 struct ecryptfs_file_info {
357 struct file *wfi_file;
358 struct ecryptfs_crypt_stat *crypt_stat;
361 /* auth_tok <=> encrypted_session_key mappings */
362 struct ecryptfs_auth_tok_list_item {
363 unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
364 struct list_head list;
365 struct ecryptfs_auth_tok auth_tok;
368 struct ecryptfs_message {
374 struct ecryptfs_msg_ctx {
375 #define ECRYPTFS_MSG_CTX_STATE_FREE 0x0001
376 #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x0002
377 #define ECRYPTFS_MSG_CTX_STATE_DONE 0x0003
380 unsigned int counter;
381 struct ecryptfs_message *msg;
382 struct task_struct *task;
383 struct list_head node;
387 extern unsigned int ecryptfs_transport;
389 struct ecryptfs_daemon_id {
392 struct hlist_node id_chain;
395 static inline struct ecryptfs_file_info *
396 ecryptfs_file_to_private(struct file *file)
398 return (struct ecryptfs_file_info *)file->private_data;
402 ecryptfs_set_file_private(struct file *file,
403 struct ecryptfs_file_info *file_info)
405 file->private_data = file_info;
408 static inline struct file *ecryptfs_file_to_lower(struct file *file)
410 return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
414 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
416 ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
420 static inline struct ecryptfs_inode_info *
421 ecryptfs_inode_to_private(struct inode *inode)
423 return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
426 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
428 return ecryptfs_inode_to_private(inode)->wii_inode;
432 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
434 ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
437 static inline struct ecryptfs_sb_info *
438 ecryptfs_superblock_to_private(struct super_block *sb)
440 return (struct ecryptfs_sb_info *)sb->s_fs_info;
444 ecryptfs_set_superblock_private(struct super_block *sb,
445 struct ecryptfs_sb_info *sb_info)
447 sb->s_fs_info = sb_info;
450 static inline struct super_block *
451 ecryptfs_superblock_to_lower(struct super_block *sb)
453 return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
457 ecryptfs_set_superblock_lower(struct super_block *sb,
458 struct super_block *lower_sb)
460 ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
463 static inline struct ecryptfs_dentry_info *
464 ecryptfs_dentry_to_private(struct dentry *dentry)
466 return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
470 ecryptfs_set_dentry_private(struct dentry *dentry,
471 struct ecryptfs_dentry_info *dentry_info)
473 dentry->d_fsdata = dentry_info;
476 static inline struct dentry *
477 ecryptfs_dentry_to_lower(struct dentry *dentry)
479 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
483 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
485 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
489 static inline struct vfsmount *
490 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
492 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
496 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
498 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
502 #define ecryptfs_printk(type, fmt, arg...) \
503 __ecryptfs_printk(type "%s: " fmt, __FUNCTION__, ## arg);
504 void __ecryptfs_printk(const char *fmt, ...);
506 extern const struct file_operations ecryptfs_main_fops;
507 extern const struct file_operations ecryptfs_dir_fops;
508 extern const struct inode_operations ecryptfs_main_iops;
509 extern const struct inode_operations ecryptfs_dir_iops;
510 extern const struct inode_operations ecryptfs_symlink_iops;
511 extern const struct super_operations ecryptfs_sops;
512 extern struct dentry_operations ecryptfs_dops;
513 extern struct address_space_operations ecryptfs_aops;
514 extern int ecryptfs_verbosity;
515 extern unsigned int ecryptfs_message_buf_len;
516 extern signed long ecryptfs_message_wait_timeout;
517 extern unsigned int ecryptfs_number_of_users;
519 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
520 extern struct kmem_cache *ecryptfs_file_info_cache;
521 extern struct kmem_cache *ecryptfs_dentry_info_cache;
522 extern struct kmem_cache *ecryptfs_inode_info_cache;
523 extern struct kmem_cache *ecryptfs_sb_info_cache;
524 extern struct kmem_cache *ecryptfs_header_cache_0;
525 extern struct kmem_cache *ecryptfs_header_cache_1;
526 extern struct kmem_cache *ecryptfs_header_cache_2;
527 extern struct kmem_cache *ecryptfs_xattr_cache;
528 extern struct kmem_cache *ecryptfs_lower_page_cache;
529 extern struct kmem_cache *ecryptfs_key_record_cache;
530 extern struct kmem_cache *ecryptfs_key_sig_cache;
531 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
532 extern struct kmem_cache *ecryptfs_key_tfm_cache;
534 int ecryptfs_interpose(struct dentry *hidden_dentry,
535 struct dentry *this_dentry, struct super_block *sb,
537 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
538 int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat,
539 const char *name, int length,
540 char **decrypted_name);
541 int ecryptfs_encode_filename(struct ecryptfs_crypt_stat *crypt_stat,
542 const char *name, int length,
543 char **encoded_name);
544 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
545 void ecryptfs_dump_hex(char *data, int bytes);
546 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
548 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
549 void ecryptfs_rotate_iv(unsigned char *iv);
550 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
551 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
552 void ecryptfs_destroy_mount_crypt_stat(
553 struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
554 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
555 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptefs_inode);
556 int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
557 struct file *lower_file,
558 unsigned long lower_page_index, int byte_offset,
561 ecryptfs_commit_lower_page(struct page *lower_page, struct inode *lower_inode,
562 struct file *lower_file, int byte_offset,
564 int ecryptfs_copy_page_to_lower(struct page *page, struct inode *lower_inode,
565 struct file *lower_file);
566 int ecryptfs_do_readpage(struct file *file, struct page *page,
567 pgoff_t lower_page_index);
568 int ecryptfs_writepage_and_release_lower_page(struct page *lower_page,
569 struct inode *lower_inode,
570 struct writeback_control *wbc);
571 int ecryptfs_encrypt_page(struct page *page);
572 int ecryptfs_decrypt_page(struct page *page);
573 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry);
574 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
575 int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
576 int ecryptfs_read_and_validate_header_region(char *data,
577 struct inode *ecryptfs_inode);
578 int ecryptfs_read_and_validate_xattr_region(char *page_virt,
579 struct dentry *ecryptfs_dentry);
580 u16 ecryptfs_code_for_cipher_string(struct ecryptfs_crypt_stat *crypt_stat);
581 int ecryptfs_cipher_code_to_string(char *str, u16 cipher_code);
582 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
583 int ecryptfs_generate_key_packet_set(char *dest_base,
584 struct ecryptfs_crypt_stat *crypt_stat,
585 struct dentry *ecryptfs_dentry,
586 size_t *len, size_t max);
588 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
589 unsigned char *src, struct dentry *ecryptfs_dentry);
590 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
591 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
592 int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
593 void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
594 int ecryptfs_open_lower_file(struct file **lower_file,
595 struct dentry *lower_dentry,
596 struct vfsmount *lower_mnt, int flags);
597 int ecryptfs_close_lower_file(struct file *lower_file);
598 ssize_t ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
601 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
602 void *value, size_t size);
604 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
605 size_t size, int flags);
606 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
607 int ecryptfs_process_helo(unsigned int transport, uid_t uid, pid_t pid);
608 int ecryptfs_process_quit(uid_t uid, pid_t pid);
609 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t uid,
611 int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
612 struct ecryptfs_msg_ctx **msg_ctx);
613 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
614 struct ecryptfs_message **emsg);
615 int ecryptfs_init_messaging(unsigned int transport);
616 void ecryptfs_release_messaging(unsigned int transport);
618 int ecryptfs_send_netlink(char *data, int data_len,
619 struct ecryptfs_msg_ctx *msg_ctx, u16 msg_type,
620 u16 msg_flags, pid_t daemon_pid);
621 int ecryptfs_init_netlink(void);
622 void ecryptfs_release_netlink(void);
624 int ecryptfs_send_connector(char *data, int data_len,
625 struct ecryptfs_msg_ctx *msg_ctx, u16 msg_type,
626 u16 msg_flags, pid_t daemon_pid);
627 int ecryptfs_init_connector(void);
628 void ecryptfs_release_connector(void);
630 ecryptfs_write_header_metadata(char *virt,
631 struct ecryptfs_crypt_stat *crypt_stat,
633 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
635 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
637 int ecryptfs_get_global_auth_tok_for_sig(
638 struct ecryptfs_global_auth_tok **global_auth_tok,
639 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
641 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
643 int ecryptfs_init_crypto(void);
644 int ecryptfs_destroy_crypto(void);
645 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
646 struct mutex **tfm_mutex,
648 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
649 struct ecryptfs_auth_tok **auth_tok,
651 int ecryptfs_write_zeros(struct file *file, pgoff_t index, int start,
653 void ecryptfs_lower_offset_for_extent(loff_t *offset, loff_t extent_num,
654 struct ecryptfs_crypt_stat *crypt_stat);
655 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
656 loff_t offset, size_t size);
657 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
658 struct page *page_for_lower,
659 size_t offset_in_page, size_t size);
660 int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
662 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
663 struct inode *ecryptfs_inode);
664 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
666 size_t offset_in_page, size_t size,
667 struct inode *ecryptfs_inode);
668 int ecryptfs_read(char *data, loff_t offset, size_t size,
669 struct file *ecryptfs_file);
670 struct page *ecryptfs_get1page(struct file *file, loff_t index);
672 #endif /* #ifndef ECRYPTFS_KERNEL_H */