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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 #include <linux/crypto.h>
 42 
 43 #define ECRYPTFS_DEFAULT_IV_BYTES 16
 44 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
 45 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
 46 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
 47 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
 48 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
 49 #define ECRYPTFS_DEFAULT_NUM_USERS 4
 50 #define ECRYPTFS_MAX_NUM_USERS 32768
 51 #define ECRYPTFS_XATTR_NAME "user.ecryptfs"
 52 
 53 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
 54 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
 55 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
 56 
 57 struct ecryptfs_key_record {
 58         unsigned char type;
 59         size_t enc_key_size;
 60         unsigned char sig[ECRYPTFS_SIG_SIZE];
 61         unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
 62 };
 63 
 64 struct ecryptfs_auth_tok_list {
 65         struct ecryptfs_auth_tok *auth_tok;
 66         struct list_head list;
 67 };
 68 
 69 struct ecryptfs_crypt_stat;
 70 struct ecryptfs_mount_crypt_stat;
 71 
 72 struct ecryptfs_page_crypt_context {
 73         struct page *page;
 74 #define ECRYPTFS_PREPARE_COMMIT_MODE 0
 75 #define ECRYPTFS_WRITEPAGE_MODE      1
 76         unsigned int mode;
 77         union {
 78                 struct file *lower_file;
 79                 struct writeback_control *wbc;
 80         } param;
 81 };
 82 
 83 #if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
 84 static inline struct ecryptfs_auth_tok *
 85 ecryptfs_get_encrypted_key_payload_data(struct key *key)
 86 {
 87         if (key->type == &key_type_encrypted)
 88                 return (struct ecryptfs_auth_tok *)
 89                         (&((struct encrypted_key_payload *)key->payload.data[0])->payload_data);
 90         else
 91                 return NULL;
 92 }
 93 
 94 static inline struct key *ecryptfs_get_encrypted_key(char *sig)
 95 {
 96         return request_key(&key_type_encrypted, sig, NULL);
 97 }
 98 
 99 #else
100 static inline struct ecryptfs_auth_tok *
101 ecryptfs_get_encrypted_key_payload_data(struct key *key)
102 {
103         return NULL;
104 }
105 
106 static inline struct key *ecryptfs_get_encrypted_key(char *sig)
107 {
108         return ERR_PTR(-ENOKEY);
109 }
110 
111 #endif /* CONFIG_ENCRYPTED_KEYS */
112 
113 static inline struct ecryptfs_auth_tok *
114 ecryptfs_get_key_payload_data(struct key *key)
115 {
116         struct ecryptfs_auth_tok *auth_tok;
117 
118         auth_tok = ecryptfs_get_encrypted_key_payload_data(key);
119         if (!auth_tok)
120                 return (struct ecryptfs_auth_tok *)user_key_payload(key)->data;
121         else
122                 return auth_tok;
123 }
124 
125 #define ECRYPTFS_MAX_KEYSET_SIZE 1024
126 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 31
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 #ifdef CONFIG_ECRYPT_FS_MESSAGING
176 # define ECRYPTFS_VERSIONING_MASK_MESSAGING (ECRYPTFS_VERSIONING_DEVMISC \
177                                              | ECRYPTFS_VERSIONING_PUBKEY)
178 #else
179 # define ECRYPTFS_VERSIONING_MASK_MESSAGING 0
180 #endif
181 
182 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
183                                   | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
184                                   | ECRYPTFS_VERSIONING_XATTR \
185                                   | ECRYPTFS_VERSIONING_MULTKEY \
186                                   | ECRYPTFS_VERSIONING_MASK_MESSAGING \
187                                   | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION)
188 struct ecryptfs_key_sig {
189         struct list_head crypt_stat_list;
190         char keysig[ECRYPTFS_SIG_SIZE_HEX + 1];
191 };
192 
193 struct ecryptfs_filename {
194         struct list_head crypt_stat_list;
195 #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001
196         u32 flags;
197         u32 seq_no;
198         char *filename;
199         char *encrypted_filename;
200         size_t filename_size;
201         size_t encrypted_filename_size;
202         char fnek_sig[ECRYPTFS_SIG_SIZE_HEX];
203         char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1];
204 };
205 
206 /**
207  * This is the primary struct associated with each encrypted file.
208  *
209  * TODO: cache align/pack?
210  */
211 struct ecryptfs_crypt_stat {
212 #define ECRYPTFS_STRUCT_INITIALIZED   0x00000001
213 #define ECRYPTFS_POLICY_APPLIED       0x00000002
214 #define ECRYPTFS_ENCRYPTED            0x00000004
215 #define ECRYPTFS_SECURITY_WARNING     0x00000008
216 #define ECRYPTFS_ENABLE_HMAC          0x00000010
217 #define ECRYPTFS_ENCRYPT_IV_PAGES     0x00000020
218 #define ECRYPTFS_KEY_VALID            0x00000040
219 #define ECRYPTFS_METADATA_IN_XATTR    0x00000080
220 #define ECRYPTFS_VIEW_AS_ENCRYPTED    0x00000100
221 #define ECRYPTFS_KEY_SET              0x00000200
222 #define ECRYPTFS_ENCRYPT_FILENAMES    0x00000400
223 #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800
224 #define ECRYPTFS_ENCFN_USE_FEK        0x00001000
225 #define ECRYPTFS_UNLINK_SIGS          0x00002000
226 #define ECRYPTFS_I_SIZE_INITIALIZED   0x00004000
227         u32 flags;
228         unsigned int file_version;
229         size_t iv_bytes;
230         size_t metadata_size;
231         size_t extent_size; /* Data extent size; default is 4096 */
232         size_t key_size;
233         size_t extent_shift;
234         unsigned int extent_mask;
235         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
236         struct crypto_ablkcipher *tfm;
237         struct crypto_hash *hash_tfm; /* Crypto context for generating
238                                        * the initialization vectors */
239         unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
240         unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
241         unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
242         struct list_head keysig_list;
243         struct mutex keysig_list_mutex;
244         struct mutex cs_tfm_mutex;
245         struct mutex cs_hash_tfm_mutex;
246         struct mutex cs_mutex;
247 };
248 
249 /* inode private data. */
250 struct ecryptfs_inode_info {
251         struct inode vfs_inode;
252         struct inode *wii_inode;
253         struct mutex lower_file_mutex;
254         atomic_t lower_file_count;
255         struct file *lower_file;
256         struct ecryptfs_crypt_stat crypt_stat;
257 };
258 
259 /* dentry private data. Each dentry must keep track of a lower
260  * vfsmount too. */
261 struct ecryptfs_dentry_info {
262         struct path lower_path;
263         union {
264                 struct ecryptfs_crypt_stat *crypt_stat;
265                 struct rcu_head rcu;
266         };
267 };
268 
269 /**
270  * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
271  * @flags: Status flags
272  * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
273  *                         cryptographic context. Every time a new
274  *                         inode comes into existence, eCryptfs copies
275  *                         the auth_toks on that list to the set of
276  *                         auth_toks on the inode's crypt_stat
277  * @global_auth_tok_key: The key from the user's keyring for the sig
278  * @global_auth_tok: The key contents
279  * @sig: The key identifier
280  *
281  * ecryptfs_global_auth_tok structs refer to authentication token keys
282  * in the user keyring that apply to newly created files. A list of
283  * these objects hangs off of the mount_crypt_stat struct for any
284  * given eCryptfs mount. This struct maintains a reference to both the
285  * key contents and the key itself so that the key can be put on
286  * unmount.
287  */
288 struct ecryptfs_global_auth_tok {
289 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
290 #define ECRYPTFS_AUTH_TOK_FNEK    0x00000002
291         u32 flags;
292         struct list_head mount_crypt_stat_list;
293         struct key *global_auth_tok_key;
294         unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
295 };
296 
297 /**
298  * ecryptfs_key_tfm - Persistent key tfm
299  * @key_tfm: crypto API handle to the key
300  * @key_size: Key size in bytes
301  * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
302  *                 using the persistent TFM at any point in time
303  * @key_tfm_list: Handle to hang this off the module-wide TFM list
304  * @cipher_name: String name for the cipher for this TFM
305  *
306  * Typically, eCryptfs will use the same ciphers repeatedly throughout
307  * the course of its operations. In order to avoid unnecessarily
308  * destroying and initializing the same cipher repeatedly, eCryptfs
309  * keeps a list of crypto API contexts around to use when needed.
310  */
311 struct ecryptfs_key_tfm {
312         struct crypto_blkcipher *key_tfm;
313         size_t key_size;
314         struct mutex key_tfm_mutex;
315         struct list_head key_tfm_list;
316         unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
317 };
318 
319 extern struct mutex key_tfm_list_mutex;
320 
321 /**
322  * This struct is to enable a mount-wide passphrase/salt combo. This
323  * is more or less a stopgap to provide similar functionality to other
324  * crypto filesystems like EncFS or CFS until full policy support is
325  * implemented in eCryptfs.
326  */
327 struct ecryptfs_mount_crypt_stat {
328         /* Pointers to memory we do not own, do not free these */
329 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
330 #define ECRYPTFS_XATTR_METADATA_ENABLED        0x00000002
331 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED        0x00000004
332 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED  0x00000008
333 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES      0x00000010
334 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK   0x00000020
335 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK          0x00000040
336 #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY    0x00000080
337         u32 flags;
338         struct list_head global_auth_tok_list;
339         struct mutex global_auth_tok_list_mutex;
340         size_t global_default_cipher_key_size;
341         size_t global_default_fn_cipher_key_bytes;
342         unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
343                                                  + 1];
344         unsigned char global_default_fn_cipher_name[
345                 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
346         char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
347 };
348 
349 /* superblock private data. */
350 struct ecryptfs_sb_info {
351         struct super_block *wsi_sb;
352         struct ecryptfs_mount_crypt_stat mount_crypt_stat;
353         struct backing_dev_info bdi;
354 };
355 
356 /* file private data. */
357 struct ecryptfs_file_info {
358         struct file *wfi_file;
359         struct ecryptfs_crypt_stat *crypt_stat;
360 };
361 
362 /* auth_tok <=> encrypted_session_key mappings */
363 struct ecryptfs_auth_tok_list_item {
364         unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
365         struct list_head list;
366         struct ecryptfs_auth_tok auth_tok;
367 };
368 
369 struct ecryptfs_message {
370         /* Can never be greater than ecryptfs_message_buf_len */
371         /* Used to find the parent msg_ctx */
372         /* Inherits from msg_ctx->index */
373         u32 index;
374         u32 data_len;
375         u8 data[];
376 };
377 
378 struct ecryptfs_msg_ctx {
379 #define ECRYPTFS_MSG_CTX_STATE_FREE     0x01
380 #define ECRYPTFS_MSG_CTX_STATE_PENDING  0x02
381 #define ECRYPTFS_MSG_CTX_STATE_DONE     0x03
382 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
383         u8 state;
384 #define ECRYPTFS_MSG_HELO 100
385 #define ECRYPTFS_MSG_QUIT 101
386 #define ECRYPTFS_MSG_REQUEST 102
387 #define ECRYPTFS_MSG_RESPONSE 103
388         u8 type;
389         u32 index;
390         /* Counter converts to a sequence number. Each message sent
391          * out for which we expect a response has an associated
392          * sequence number. The response must have the same sequence
393          * number as the counter for the msg_stc for the message to be
394          * valid. */
395         u32 counter;
396         size_t msg_size;
397         struct ecryptfs_message *msg;
398         struct task_struct *task;
399         struct list_head node;
400         struct list_head daemon_out_list;
401         struct mutex mux;
402 };
403 
404 struct ecryptfs_daemon {
405 #define ECRYPTFS_DAEMON_IN_READ      0x00000001
406 #define ECRYPTFS_DAEMON_IN_POLL      0x00000002
407 #define ECRYPTFS_DAEMON_ZOMBIE       0x00000004
408 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
409         u32 flags;
410         u32 num_queued_msg_ctx;
411         struct file *file;
412         struct mutex mux;
413         struct list_head msg_ctx_out_queue;
414         wait_queue_head_t wait;
415         struct hlist_node euid_chain;
416 };
417 
418 #ifdef CONFIG_ECRYPT_FS_MESSAGING
419 extern struct mutex ecryptfs_daemon_hash_mux;
420 #endif
421 
422 static inline size_t
423 ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat)
424 {
425         if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
426                 return 0;
427         return crypt_stat->metadata_size;
428 }
429 
430 static inline struct ecryptfs_file_info *
431 ecryptfs_file_to_private(struct file *file)
432 {
433         return file->private_data;
434 }
435 
436 static inline void
437 ecryptfs_set_file_private(struct file *file,
438                           struct ecryptfs_file_info *file_info)
439 {
440         file->private_data = file_info;
441 }
442 
443 static inline struct file *ecryptfs_file_to_lower(struct file *file)
444 {
445         return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
446 }
447 
448 static inline void
449 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
450 {
451         ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
452                 lower_file;
453 }
454 
455 static inline struct ecryptfs_inode_info *
456 ecryptfs_inode_to_private(struct inode *inode)
457 {
458         return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
459 }
460 
461 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
462 {
463         return ecryptfs_inode_to_private(inode)->wii_inode;
464 }
465 
466 static inline void
467 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
468 {
469         ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
470 }
471 
472 static inline struct ecryptfs_sb_info *
473 ecryptfs_superblock_to_private(struct super_block *sb)
474 {
475         return (struct ecryptfs_sb_info *)sb->s_fs_info;
476 }
477 
478 static inline void
479 ecryptfs_set_superblock_private(struct super_block *sb,
480                                 struct ecryptfs_sb_info *sb_info)
481 {
482         sb->s_fs_info = sb_info;
483 }
484 
485 static inline struct super_block *
486 ecryptfs_superblock_to_lower(struct super_block *sb)
487 {
488         return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
489 }
490 
491 static inline void
492 ecryptfs_set_superblock_lower(struct super_block *sb,
493                               struct super_block *lower_sb)
494 {
495         ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
496 }
497 
498 static inline struct ecryptfs_dentry_info *
499 ecryptfs_dentry_to_private(struct dentry *dentry)
500 {
501         return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
502 }
503 
504 static inline void
505 ecryptfs_set_dentry_private(struct dentry *dentry,
506                             struct ecryptfs_dentry_info *dentry_info)
507 {
508         dentry->d_fsdata = dentry_info;
509 }
510 
511 static inline struct dentry *
512 ecryptfs_dentry_to_lower(struct dentry *dentry)
513 {
514         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
515 }
516 
517 static inline struct vfsmount *
518 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
519 {
520         return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
521 }
522 
523 static inline struct path *
524 ecryptfs_dentry_to_lower_path(struct dentry *dentry)
525 {
526         return &((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path;
527 }
528 
529 #define ecryptfs_printk(type, fmt, arg...) \
530         __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
531 __printf(1, 2)
532 void __ecryptfs_printk(const char *fmt, ...);
533 
534 extern const struct file_operations ecryptfs_main_fops;
535 extern const struct file_operations ecryptfs_dir_fops;
536 extern const struct inode_operations ecryptfs_main_iops;
537 extern const struct inode_operations ecryptfs_dir_iops;
538 extern const struct inode_operations ecryptfs_symlink_iops;
539 extern const struct super_operations ecryptfs_sops;
540 extern const struct dentry_operations ecryptfs_dops;
541 extern const struct address_space_operations ecryptfs_aops;
542 extern int ecryptfs_verbosity;
543 extern unsigned int ecryptfs_message_buf_len;
544 extern signed long ecryptfs_message_wait_timeout;
545 extern unsigned int ecryptfs_number_of_users;
546 
547 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
548 extern struct kmem_cache *ecryptfs_file_info_cache;
549 extern struct kmem_cache *ecryptfs_dentry_info_cache;
550 extern struct kmem_cache *ecryptfs_inode_info_cache;
551 extern struct kmem_cache *ecryptfs_sb_info_cache;
552 extern struct kmem_cache *ecryptfs_header_cache;
553 extern struct kmem_cache *ecryptfs_xattr_cache;
554 extern struct kmem_cache *ecryptfs_key_record_cache;
555 extern struct kmem_cache *ecryptfs_key_sig_cache;
556 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
557 extern struct kmem_cache *ecryptfs_key_tfm_cache;
558 
559 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
560                                  struct super_block *sb);
561 void ecryptfs_i_size_init(const char *page_virt, struct inode *inode);
562 int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
563                              struct inode *ecryptfs_inode);
564 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
565                                          size_t *decrypted_name_size,
566                                          struct super_block *sb,
567                                          const char *name, size_t name_size);
568 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
569 int ecryptfs_encrypt_and_encode_filename(
570         char **encoded_name,
571         size_t *encoded_name_size,
572         struct ecryptfs_crypt_stat *crypt_stat,
573         struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
574         const char *name, size_t name_size);
575 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
576 void ecryptfs_dump_hex(char *data, int bytes);
577 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
578                         int sg_size);
579 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
580 void ecryptfs_rotate_iv(unsigned char *iv);
581 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
582 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
583 void ecryptfs_destroy_mount_crypt_stat(
584         struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
585 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
586 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
587 int ecryptfs_encrypt_page(struct page *page);
588 int ecryptfs_decrypt_page(struct page *page);
589 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
590                             struct inode *ecryptfs_inode);
591 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
592 int ecryptfs_new_file_context(struct inode *ecryptfs_inode);
593 void ecryptfs_write_crypt_stat_flags(char *page_virt,
594                                      struct ecryptfs_crypt_stat *crypt_stat,
595                                      size_t *written);
596 int ecryptfs_read_and_validate_header_region(struct inode *inode);
597 int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
598                                             struct inode *inode);
599 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
600 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
601 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
602 int ecryptfs_generate_key_packet_set(char *dest_base,
603                                      struct ecryptfs_crypt_stat *crypt_stat,
604                                      struct dentry *ecryptfs_dentry,
605                                      size_t *len, size_t max);
606 int
607 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
608                           unsigned char *src, struct dentry *ecryptfs_dentry);
609 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
610 ssize_t
611 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
612                         void *value, size_t size);
613 int
614 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
615                   size_t size, int flags);
616 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
617 #ifdef CONFIG_ECRYPT_FS_MESSAGING
618 int ecryptfs_process_response(struct ecryptfs_daemon *daemon,
619                               struct ecryptfs_message *msg, u32 seq);
620 int ecryptfs_send_message(char *data, int data_len,
621                           struct ecryptfs_msg_ctx **msg_ctx);
622 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
623                                struct ecryptfs_message **emsg);
624 int ecryptfs_init_messaging(void);
625 void ecryptfs_release_messaging(void);
626 #else
627 static inline int ecryptfs_init_messaging(void)
628 {
629         return 0;
630 }
631 static inline void ecryptfs_release_messaging(void)
632 { }
633 static inline int ecryptfs_send_message(char *data, int data_len,
634                                         struct ecryptfs_msg_ctx **msg_ctx)
635 {
636         return -ENOTCONN;
637 }
638 static inline int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
639                                              struct ecryptfs_message **emsg)
640 {
641         return -ENOMSG;
642 }
643 #endif
644 
645 void
646 ecryptfs_write_header_metadata(char *virt,
647                                struct ecryptfs_crypt_stat *crypt_stat,
648                                size_t *written);
649 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
650 int
651 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
652                            char *sig, u32 global_auth_tok_flags);
653 int ecryptfs_get_global_auth_tok_for_sig(
654         struct ecryptfs_global_auth_tok **global_auth_tok,
655         struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
656 int
657 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
658                          size_t key_size);
659 int ecryptfs_init_crypto(void);
660 int ecryptfs_destroy_crypto(void);
661 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
662 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
663                                                struct mutex **tfm_mutex,
664                                                char *cipher_name);
665 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
666                                       struct ecryptfs_auth_tok **auth_tok,
667                                       char *sig);
668 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
669                          loff_t offset, size_t size);
670 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
671                                       struct page *page_for_lower,
672                                       size_t offset_in_page, size_t size);
673 int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size);
674 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
675                         struct inode *ecryptfs_inode);
676 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
677                                      pgoff_t page_index,
678                                      size_t offset_in_page, size_t size,
679                                      struct inode *ecryptfs_inode);
680 struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
681 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
682                                  size_t *length_size);
683 int ecryptfs_write_packet_length(char *dest, size_t size,
684                                  size_t *packet_size_length);
685 #ifdef CONFIG_ECRYPT_FS_MESSAGING
686 int ecryptfs_init_ecryptfs_miscdev(void);
687 void ecryptfs_destroy_ecryptfs_miscdev(void);
688 int ecryptfs_send_miscdev(char *data, size_t data_size,
689                           struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
690                           u16 msg_flags, struct ecryptfs_daemon *daemon);
691 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
692 int
693 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file);
694 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
695 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon);
696 #endif
697 int ecryptfs_init_kthread(void);
698 void ecryptfs_destroy_kthread(void);
699 int ecryptfs_privileged_open(struct file **lower_file,
700                              struct dentry *lower_dentry,
701                              struct vfsmount *lower_mnt,
702                              const struct cred *cred);
703 int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode);
704 void ecryptfs_put_lower_file(struct inode *inode);
705 int
706 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
707                              size_t *packet_size,
708                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
709                              char *filename, size_t filename_size);
710 int
711 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
712                              size_t *packet_size,
713                              struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
714                              char *data, size_t max_packet_size);
715 int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
716                            struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
717 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
718                        loff_t offset);
719 
720 #endif /* #ifndef ECRYPTFS_KERNEL_H */
721 

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