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TOMOYO Linux Cross Reference
Linux/fs/ecryptfs/ecryptfs_kernel.h

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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) 2004-2008 International Business Machines Corp.
  8  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
  9  *              Trevor S. Highland <trevor.highland@gmail.com>
 10  *              Tyler Hicks <tyhicks@ou.edu>
 11  *
 12  * This program is free software; you can redistribute it and/or
 13  * modify it under the terms of the GNU General Public License as
 14  * published by the Free Software Foundation; either version 2 of the
 15  * License, or (at your option) any later version.
 16  *
 17  * This program is distributed in the hope that it will be useful, but
 18  * WITHOUT ANY WARRANTY; without even the implied warranty of
 19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 20  * General Public License for more details.
 21  *
 22  * You should have received a copy of the GNU General Public License
 23  * along with this program; if not, write to the Free Software
 24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 25  * 02111-1307, USA.
 26  */
 27 
 28 #ifndef ECRYPTFS_KERNEL_H
 29 #define ECRYPTFS_KERNEL_H
 30 
 31 #include <keys/user-type.h>
 32 #include <keys/encrypted-type.h>
 33 #include <linux/fs.h>
 34 #include <linux/fs_stack.h>
 35 #include <linux/namei.h>
 36 #include <linux/scatterlist.h>
 37 #include <linux/hash.h>
 38 #include <linux/nsproxy.h>
 39 #include <linux/backing-dev.h>
 40 #include <linux/ecryptfs.h>
 41 
 42 #define ECRYPTFS_DEFAULT_IV_BYTES 16
 43 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
 44 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
 45 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
 46 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
 47 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
 48 #define ECRYPTFS_DEFAULT_NUM_USERS 4
 49 #define ECRYPTFS_MAX_NUM_USERS 32768
 50 #define ECRYPTFS_XATTR_NAME "user.ecryptfs"
 51 
 52 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
 53 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
 54 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
 55 
 56 struct ecryptfs_key_record {
 57         unsigned char type;
 58         size_t enc_key_size;
 59         unsigned char sig[ECRYPTFS_SIG_SIZE];
 60         unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
 61 };
 62 
 63 struct ecryptfs_auth_tok_list {
 64         struct ecryptfs_auth_tok *auth_tok;
 65         struct list_head list;
 66 };
 67 
 68 struct ecryptfs_crypt_stat;
 69 struct ecryptfs_mount_crypt_stat;
 70 
 71 struct ecryptfs_page_crypt_context {
 72         struct page *page;
 73 #define ECRYPTFS_PREPARE_COMMIT_MODE 0
 74 #define ECRYPTFS_WRITEPAGE_MODE      1
 75         unsigned int mode;
 76         union {
 77                 struct file *lower_file;
 78                 struct writeback_control *wbc;
 79         } param;
 80 };
 81 
 82 #if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
 83 static inline struct ecryptfs_auth_tok *
 84 ecryptfs_get_encrypted_key_payload_data(struct key *key)
 85 {
 86         if (key->type == &key_type_encrypted)
 87                 return (struct ecryptfs_auth_tok *)
 88                         (&((struct encrypted_key_payload *)key->payload.data)->payload_data);
 89         else
 90                 return NULL;
 91 }
 92 
 93 static inline struct key *ecryptfs_get_encrypted_key(char *sig)
 94 {
 95         return request_key(&key_type_encrypted, sig, NULL);
 96 }
 97 
 98 #else
 99 static inline struct ecryptfs_auth_tok *
100 ecryptfs_get_encrypted_key_payload_data(struct key *key)
101 {
102         return NULL;
103 }
104 
105 static inline struct key *ecryptfs_get_encrypted_key(char *sig)
106 {
107         return ERR_PTR(-ENOKEY);
108 }
109 
110 #endif /* CONFIG_ENCRYPTED_KEYS */
111 
112 static inline struct ecryptfs_auth_tok *
113 ecryptfs_get_key_payload_data(struct key *key)
114 {
115         struct ecryptfs_auth_tok *auth_tok;
116 
117         auth_tok = ecryptfs_get_encrypted_key_payload_data(key);
118         if (!auth_tok)
119                 return (struct ecryptfs_auth_tok *)
120                         (((struct user_key_payload *)key->payload.data)->data);
121         else
122                 return auth_tok;
123 }
124 
125 #define ECRYPTFS_MAX_KEYSET_SIZE 1024
126 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
127 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64
128 #define ECRYPTFS_MAX_IV_BYTES 16        /* 128 bits */
129 #define ECRYPTFS_SALT_BYTES 2
130 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
131 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8      /* 4*2 */
132 #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
133 #define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \
134                                         + MAGIC_ECRYPTFS_MARKER_SIZE_BYTES)
135 #define ECRYPTFS_DEFAULT_CIPHER "aes"
136 #define ECRYPTFS_DEFAULT_KEY_BYTES 16
137 #define ECRYPTFS_DEFAULT_HASH "md5"
138 #define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH
139 #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
140 #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
141 #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
142 #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
143 #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
144 #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
145 #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
146 #define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename
147                                           * as dentry name */
148 #define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in
149                                           * metadata */
150 #define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as
151                                           * dentry name */
152 #define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as
153                                           * metadata */
154 #define ECRYPTFS_MIN_PKT_LEN_SIZE 1 /* Min size to specify packet length */
155 #define ECRYPTFS_MAX_PKT_LEN_SIZE 2 /* Pass at least this many bytes to
156                                      * ecryptfs_parse_packet_length() and
157                                      * ecryptfs_write_packet_length()
158                                      */
159 /* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >=
160  * ECRYPTFS_MAX_IV_BYTES */
161 #define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16
162 #define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */
163 #define MD5_DIGEST_SIZE 16
164 #define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE
165 #define ECRYPTFS_TAG_70_MIN_METADATA_SIZE (1 + ECRYPTFS_MIN_PKT_LEN_SIZE \
166                                            + ECRYPTFS_SIG_SIZE + 1 + 1)
167 #define ECRYPTFS_TAG_70_MAX_METADATA_SIZE (1 + ECRYPTFS_MAX_PKT_LEN_SIZE \
168                                            + ECRYPTFS_SIG_SIZE + 1 + 1)
169 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED."
170 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23
171 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED."
172 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24
173 #define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32)
174 
175 struct ecryptfs_key_sig {
176         struct list_head crypt_stat_list;
177         char keysig[ECRYPTFS_SIG_SIZE_HEX + 1];
178 };
179 
180 struct ecryptfs_filename {
181         struct list_head crypt_stat_list;
182 #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001
183         u32 flags;
184         u32 seq_no;
185         char *filename;
186         char *encrypted_filename;
187         size_t filename_size;
188         size_t encrypted_filename_size;
189         char fnek_sig[ECRYPTFS_SIG_SIZE_HEX];
190         char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1];
191 };
192 
193 /**
194  * This is the primary struct associated with each encrypted file.
195  *
196  * TODO: cache align/pack?
197  */
198 struct ecryptfs_crypt_stat {
199 #define ECRYPTFS_STRUCT_INITIALIZED   0x00000001
200 #define ECRYPTFS_POLICY_APPLIED       0x00000002
201 #define ECRYPTFS_ENCRYPTED            0x00000004
202 #define ECRYPTFS_SECURITY_WARNING     0x00000008
203 #define ECRYPTFS_ENABLE_HMAC          0x00000010
204 #define ECRYPTFS_ENCRYPT_IV_PAGES     0x00000020
205 #define ECRYPTFS_KEY_VALID            0x00000040
206 #define ECRYPTFS_METADATA_IN_XATTR    0x00000080
207 #define ECRYPTFS_VIEW_AS_ENCRYPTED    0x00000100
208 #define ECRYPTFS_KEY_SET              0x00000200
209 #define ECRYPTFS_ENCRYPT_FILENAMES    0x00000400
210 #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800
211 #define ECRYPTFS_ENCFN_USE_FEK        0x00001000
212 #define ECRYPTFS_UNLINK_SIGS          0x00002000
213 #define ECRYPTFS_I_SIZE_INITIALIZED   0x00004000
214         u32 flags;
215         unsigned int file_version;
216         size_t iv_bytes;
217         size_t metadata_size;
218         size_t extent_size; /* Data extent size; default is 4096 */
219         size_t key_size;
220         size_t extent_shift;
221         unsigned int extent_mask;
222         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
223         struct crypto_blkcipher *tfm;
224         struct crypto_hash *hash_tfm; /* Crypto context for generating
225                                        * the initialization vectors */
226         unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
227         unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
228         unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
229         struct list_head keysig_list;
230         struct mutex keysig_list_mutex;
231         struct mutex cs_tfm_mutex;
232         struct mutex cs_hash_tfm_mutex;
233         struct mutex cs_mutex;
234 };
235 
236 /* inode private data. */
237 struct ecryptfs_inode_info {
238         struct inode vfs_inode;
239         struct inode *wii_inode;
240         struct mutex lower_file_mutex;
241         atomic_t lower_file_count;
242         struct file *lower_file;
243         struct ecryptfs_crypt_stat crypt_stat;
244 };
245 
246 /* dentry private data. Each dentry must keep track of a lower
247  * vfsmount too. */
248 struct ecryptfs_dentry_info {
249         struct path lower_path;
250         struct ecryptfs_crypt_stat *crypt_stat;
251 };
252 
253 /**
254  * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
255  * @flags: Status flags
256  * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
257  *                         cryptographic context. Every time a new
258  *                         inode comes into existence, eCryptfs copies
259  *                         the auth_toks on that list to the set of
260  *                         auth_toks on the inode's crypt_stat
261  * @global_auth_tok_key: The key from the user's keyring for the sig
262  * @global_auth_tok: The key contents
263  * @sig: The key identifier
264  *
265  * ecryptfs_global_auth_tok structs refer to authentication token keys
266  * in the user keyring that apply to newly created files. A list of
267  * these objects hangs off of the mount_crypt_stat struct for any
268  * given eCryptfs mount. This struct maintains a reference to both the
269  * key contents and the key itself so that the key can be put on
270  * unmount.
271  */
272 struct ecryptfs_global_auth_tok {
273 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
274 #define ECRYPTFS_AUTH_TOK_FNEK    0x00000002
275         u32 flags;
276         struct list_head mount_crypt_stat_list;
277         struct key *global_auth_tok_key;
278         unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
279 };
280 
281 /**
282  * ecryptfs_key_tfm - Persistent key tfm
283  * @key_tfm: crypto API handle to the key
284  * @key_size: Key size in bytes
285  * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
286  *                 using the persistent TFM at any point in time
287  * @key_tfm_list: Handle to hang this off the module-wide TFM list
288  * @cipher_name: String name for the cipher for this TFM
289  *
290  * Typically, eCryptfs will use the same ciphers repeatedly throughout
291  * the course of its operations. In order to avoid unnecessarily
292  * destroying and initializing the same cipher repeatedly, eCryptfs
293  * keeps a list of crypto API contexts around to use when needed.
294  */
295 struct ecryptfs_key_tfm {
296         struct crypto_blkcipher *key_tfm;
297         size_t key_size;
298         struct mutex key_tfm_mutex;
299         struct list_head key_tfm_list;
300         unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
301 };
302 
303 extern struct mutex key_tfm_list_mutex;
304 
305 /**
306  * This struct is to enable a mount-wide passphrase/salt combo. This
307  * is more or less a stopgap to provide similar functionality to other
308  * crypto filesystems like EncFS or CFS until full policy support is
309  * implemented in eCryptfs.
310  */
311 struct ecryptfs_mount_crypt_stat {
312         /* Pointers to memory we do not own, do not free these */
313 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
314 #define ECRYPTFS_XATTR_METADATA_ENABLED        0x00000002
315 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED        0x00000004
316 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED  0x00000008
317 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES      0x00000010
318 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK   0x00000020
319 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK          0x00000040
320 #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY    0x00000080
321         u32 flags;
322         struct list_head global_auth_tok_list;
323         struct mutex global_auth_tok_list_mutex;
324         size_t global_default_cipher_key_size;
325         size_t global_default_fn_cipher_key_bytes;
326         unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
327                                                  + 1];
328         unsigned char global_default_fn_cipher_name[
329                 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
330         char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
331 };
332 
333 /* superblock private data. */
334 struct ecryptfs_sb_info {
335         struct super_block *wsi_sb;
336         struct ecryptfs_mount_crypt_stat mount_crypt_stat;
337         struct backing_dev_info bdi;
338 };
339 
340 /* file private data. */
341 struct ecryptfs_file_info {
342         struct file *wfi_file;
343         struct ecryptfs_crypt_stat *crypt_stat;
344 };
345 
346 /* auth_tok <=> encrypted_session_key mappings */
347 struct ecryptfs_auth_tok_list_item {
348         unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
349         struct list_head list;
350         struct ecryptfs_auth_tok auth_tok;
351 };
352 
353 struct ecryptfs_message {
354         /* Can never be greater than ecryptfs_message_buf_len */
355         /* Used to find the parent msg_ctx */
356         /* Inherits from msg_ctx->index */
357         u32 index;
358         u32 data_len;
359         u8 data[];
360 };
361 
362 struct ecryptfs_msg_ctx {
363 #define ECRYPTFS_MSG_CTX_STATE_FREE     0x01
364 #define ECRYPTFS_MSG_CTX_STATE_PENDING  0x02
365 #define ECRYPTFS_MSG_CTX_STATE_DONE     0x03
366 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
367         u8 state;
368 #define ECRYPTFS_MSG_HELO 100
369 #define ECRYPTFS_MSG_QUIT 101
370 #define ECRYPTFS_MSG_REQUEST 102
371 #define ECRYPTFS_MSG_RESPONSE 103
372         u8 type;
373         u32 index;
374         /* Counter converts to a sequence number. Each message sent
375          * out for which we expect a response has an associated
376          * sequence number. The response must have the same sequence
377          * number as the counter for the msg_stc for the message to be
378          * valid. */
379         u32 counter;
380         size_t msg_size;
381         struct ecryptfs_message *msg;
382         struct task_struct *task;
383         struct list_head node;
384         struct list_head daemon_out_list;
385         struct mutex mux;
386 };
387 
388 struct ecryptfs_daemon {
389 #define ECRYPTFS_DAEMON_IN_READ      0x00000001
390 #define ECRYPTFS_DAEMON_IN_POLL      0x00000002
391 #define ECRYPTFS_DAEMON_ZOMBIE       0x00000004
392 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
393         u32 flags;
394         u32 num_queued_msg_ctx;
395         struct file *file;
396         struct mutex mux;
397         struct list_head msg_ctx_out_queue;
398         wait_queue_head_t wait;
399         struct hlist_node euid_chain;
400 };
401 
402 extern struct mutex ecryptfs_daemon_hash_mux;
403 
404 static inline size_t
405 ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat)
406 {
407         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
408                 return 0;
409         return crypt_stat->metadata_size;
410 }
411 
412 static inline struct ecryptfs_file_info *
413 ecryptfs_file_to_private(struct file *file)
414 {
415         return file->private_data;
416 }
417 
418 static inline void
419 ecryptfs_set_file_private(struct file *file,
420                           struct ecryptfs_file_info *file_info)
421 {
422         file->private_data = file_info;
423 }
424 
425 static inline struct file *ecryptfs_file_to_lower(struct file *file)
426 {
427         return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
428 }
429 
430 static inline void
431 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
432 {
433         ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
434                 lower_file;
435 }
436 
437 static inline struct ecryptfs_inode_info *
438 ecryptfs_inode_to_private(struct inode *inode)
439 {
440         return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
441 }
442 
443 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
444 {
445         return ecryptfs_inode_to_private(inode)->wii_inode;
446 }
447 
448 static inline void
449 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
450 {
451         ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
452 }
453 
454 static inline struct ecryptfs_sb_info *
455 ecryptfs_superblock_to_private(struct super_block *sb)
456 {
457         return (struct ecryptfs_sb_info *)sb->s_fs_info;
458 }
459 
460 static inline void
461 ecryptfs_set_superblock_private(struct super_block *sb,
462                                 struct ecryptfs_sb_info *sb_info)
463 {
464         sb->s_fs_info = sb_info;
465 }
466 
467 static inline struct super_block *
468 ecryptfs_superblock_to_lower(struct super_block *sb)
469 {
470         return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
471 }
472 
473 static inline void
474 ecryptfs_set_superblock_lower(struct super_block *sb,
475                               struct super_block *lower_sb)
476 {
477         ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
478 }
479 
480 static inline struct ecryptfs_dentry_info *
481 ecryptfs_dentry_to_private(struct dentry *dentry)
482 {
483         return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
484 }
485 
486 static inline void
487 ecryptfs_set_dentry_private(struct dentry *dentry,
488                             struct ecryptfs_dentry_info *dentry_info)
489 {
490         dentry->d_fsdata = dentry_info;
491 }
492 
493 static inline struct dentry *
494 ecryptfs_dentry_to_lower(struct dentry *dentry)
495 {
496         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
497 }
498 
499 static inline void
500 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
501 {
502         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
503                 lower_dentry;
504 }
505 
506 static inline struct vfsmount *
507 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
508 {
509         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
510 }
511 
512 static inline void
513 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
514 {
515         ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
516                 lower_mnt;
517 }
518 
519 #define ecryptfs_printk(type, fmt, arg...) \
520         __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
521 __printf(1, 2)
522 void __ecryptfs_printk(const char *fmt, ...);
523 
524 extern const struct file_operations ecryptfs_main_fops;
525 extern const struct file_operations ecryptfs_dir_fops;
526 extern const struct inode_operations ecryptfs_main_iops;
527 extern const struct inode_operations ecryptfs_dir_iops;
528 extern const struct inode_operations ecryptfs_symlink_iops;
529 extern const struct super_operations ecryptfs_sops;
530 extern const struct dentry_operations ecryptfs_dops;
531 extern const struct address_space_operations ecryptfs_aops;
532 extern int ecryptfs_verbosity;
533 extern unsigned int ecryptfs_message_buf_len;
534 extern signed long ecryptfs_message_wait_timeout;
535 extern unsigned int ecryptfs_number_of_users;
536 
537 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
538 extern struct kmem_cache *ecryptfs_file_info_cache;
539 extern struct kmem_cache *ecryptfs_dentry_info_cache;
540 extern struct kmem_cache *ecryptfs_inode_info_cache;
541 extern struct kmem_cache *ecryptfs_sb_info_cache;
542 extern struct kmem_cache *ecryptfs_header_cache;
543 extern struct kmem_cache *ecryptfs_xattr_cache;
544 extern struct kmem_cache *ecryptfs_key_record_cache;
545 extern struct kmem_cache *ecryptfs_key_sig_cache;
546 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
547 extern struct kmem_cache *ecryptfs_key_tfm_cache;
548 
549 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
550                                  struct super_block *sb);
551 void ecryptfs_i_size_init(const char *page_virt, struct inode *inode);
552 int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
553                              struct inode *ecryptfs_inode);
554 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
555                                          size_t *decrypted_name_size,
556                                          struct dentry *ecryptfs_dentry,
557                                          const char *name, size_t name_size);
558 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
559 int ecryptfs_encrypt_and_encode_filename(
560         char **encoded_name,
561         size_t *encoded_name_size,
562         struct ecryptfs_crypt_stat *crypt_stat,
563         struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
564         const char *name, size_t name_size);
565 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
566 void ecryptfs_dump_hex(char *data, int bytes);
567 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
568                         int sg_size);
569 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
570 void ecryptfs_rotate_iv(unsigned char *iv);
571 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
572 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
573 void ecryptfs_destroy_mount_crypt_stat(
574         struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
575 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
576 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
577 int ecryptfs_encrypt_page(struct page *page);
578 int ecryptfs_decrypt_page(struct page *page);
579 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
580                             struct inode *ecryptfs_inode);
581 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
582 int ecryptfs_new_file_context(struct inode *ecryptfs_inode);
583 void ecryptfs_write_crypt_stat_flags(char *page_virt,
584                                      struct ecryptfs_crypt_stat *crypt_stat,
585                                      size_t *written);
586 int ecryptfs_read_and_validate_header_region(struct inode *inode);
587 int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
588                                             struct inode *inode);
589 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
590 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
591 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
592 int ecryptfs_generate_key_packet_set(char *dest_base,
593                                      struct ecryptfs_crypt_stat *crypt_stat,
594                                      struct dentry *ecryptfs_dentry,
595                                      size_t *len, size_t max);
596 int
597 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
598                           unsigned char *src, struct dentry *ecryptfs_dentry);
599 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
600 ssize_t
601 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
602                         void *value, size_t size);
603 int
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_response(struct ecryptfs_daemon *daemon,
608                               struct ecryptfs_message *msg, u32 seq);
609 int ecryptfs_send_message(char *data, int data_len,
610                           struct ecryptfs_msg_ctx **msg_ctx);
611 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
612                                struct ecryptfs_message **emsg);
613 int ecryptfs_init_messaging(void);
614 void ecryptfs_release_messaging(void);
615 
616 void
617 ecryptfs_write_header_metadata(char *virt,
618                                struct ecryptfs_crypt_stat *crypt_stat,
619                                size_t *written);
620 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
621 int
622 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
623                            char *sig, u32 global_auth_tok_flags);
624 int ecryptfs_get_global_auth_tok_for_sig(
625         struct ecryptfs_global_auth_tok **global_auth_tok,
626         struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
627 int
628 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
629                          size_t key_size);
630 int ecryptfs_init_crypto(void);
631 int ecryptfs_destroy_crypto(void);
632 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
633 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
634                                                struct mutex **tfm_mutex,
635                                                char *cipher_name);
636 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
637                                       struct ecryptfs_auth_tok **auth_tok,
638                                       char *sig);
639 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
640                          loff_t offset, size_t size);
641 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
642                                       struct page *page_for_lower,
643                                       size_t offset_in_page, size_t size);
644 int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size);
645 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
646                         struct inode *ecryptfs_inode);
647 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
648                                      pgoff_t page_index,
649                                      size_t offset_in_page, size_t size,
650                                      struct inode *ecryptfs_inode);
651 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
652 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
653 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon);
654 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
655                                  size_t *length_size);
656 int ecryptfs_write_packet_length(char *dest, size_t size,
657                                  size_t *packet_size_length);
658 int ecryptfs_init_ecryptfs_miscdev(void);
659 void ecryptfs_destroy_ecryptfs_miscdev(void);
660 int ecryptfs_send_miscdev(char *data, size_t data_size,
661                           struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
662                           u16 msg_flags, struct ecryptfs_daemon *daemon);
663 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
664 int
665 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file);
666 int ecryptfs_init_kthread(void);
667 void ecryptfs_destroy_kthread(void);
668 int ecryptfs_privileged_open(struct file **lower_file,
669                              struct dentry *lower_dentry,
670                              struct vfsmount *lower_mnt,
671                              const struct cred *cred);
672 int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode);
673 void ecryptfs_put_lower_file(struct inode *inode);
674 int
675 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
676                              size_t *packet_size,
677                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
678                              char *filename, size_t filename_size);
679 int
680 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
681                              size_t *packet_size,
682                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
683                              char *data, size_t max_packet_size);
684 int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
685                            struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
686 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
687                        loff_t offset);
688 
689 #endif /* #ifndef ECRYPTFS_KERNEL_H */
690 

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