cregit-Linux how code gets into the kernel

Release 4.18 fs/ecryptfs/ecryptfs_kernel.h

Directory: fs/ecryptfs
/**
 * eCryptfs: Linux filesystem encryption layer
 * Kernel declarations.
 *
 * Copyright (C) 1997-2003 Erez Zadok
 * Copyright (C) 2001-2003 Stony Brook University
 * Copyright (C) 2004-2008 International Business Machines Corp.
 *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
 *              Trevor S. Highland <trevor.highland@gmail.com>
 *              Tyler Hicks <tyhicks@ou.edu>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#ifndef ECRYPTFS_KERNEL_H

#define ECRYPTFS_KERNEL_H

#include <crypto/skcipher.h>
#include <keys/user-type.h>
#include <keys/encrypted-type.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/fs_stack.h>
#include <linux/namei.h>
#include <linux/scatterlist.h>
#include <linux/hash.h>
#include <linux/nsproxy.h>
#include <linux/backing-dev.h>
#include <linux/ecryptfs.h>


#define ECRYPTFS_DEFAULT_IV_BYTES 16

#define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096

#define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192

#define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32

#define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ

#define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)

#define ECRYPTFS_DEFAULT_NUM_USERS 4

#define ECRYPTFS_MAX_NUM_USERS 32768

#define ECRYPTFS_XATTR_NAME "user.ecryptfs"

void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);

static inline void ecryptfs_to_hex(char *dst, char *src, size_t src_size) { char *end = bin2hex(dst, src, src_size); *end = '\0'; }

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extern void ecryptfs_from_hex(char *dst, char *src, int dst_size); struct ecryptfs_key_record { unsigned char type; size_t enc_key_size; unsigned char sig[ECRYPTFS_SIG_SIZE]; unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES]; }; struct ecryptfs_auth_tok_list { struct ecryptfs_auth_tok *auth_tok; struct list_head list; }; struct ecryptfs_crypt_stat; struct ecryptfs_mount_crypt_stat; struct ecryptfs_page_crypt_context { struct page *page; #define ECRYPTFS_PREPARE_COMMIT_MODE 0 #define ECRYPTFS_WRITEPAGE_MODE 1 unsigned int mode; union { struct file *lower_file; struct writeback_control *wbc; } param; }; #if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
static inline struct ecryptfs_auth_tok * ecryptfs_get_encrypted_key_payload_data(struct key *key) { struct encrypted_key_payload *payload; if (key->type != &key_type_encrypted) return NULL; payload = key->payload.data[0]; if (!payload) return ERR_PTR(-EKEYREVOKED); return (struct ecryptfs_auth_tok *)payload->payload_data; }

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static inline struct key *ecryptfs_get_encrypted_key(char *sig) { return request_key(&key_type_encrypted, sig, NULL); }

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#else
static inline struct ecryptfs_auth_tok * ecryptfs_get_encrypted_key_payload_data(struct key *key) { return NULL; }

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static inline struct key *ecryptfs_get_encrypted_key(char *sig) { return ERR_PTR(-ENOKEY); }

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#endif /* CONFIG_ENCRYPTED_KEYS */
static inline struct ecryptfs_auth_tok * ecryptfs_get_key_payload_data(struct key *key) { struct ecryptfs_auth_tok *auth_tok; struct user_key_payload *ukp; auth_tok = ecryptfs_get_encrypted_key_payload_data(key); if (auth_tok) return auth_tok; ukp = user_key_payload_locked(key); if (!ukp) return ERR_PTR(-EKEYREVOKED); return (struct ecryptfs_auth_tok *)ukp->data; }

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#define ECRYPTFS_MAX_KEYSET_SIZE 1024 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 31 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64 #define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */ #define ECRYPTFS_SALT_BYTES 2 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */ #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64)) #define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \ + MAGIC_ECRYPTFS_MARKER_SIZE_BYTES) #define ECRYPTFS_DEFAULT_CIPHER "aes" #define ECRYPTFS_DEFAULT_KEY_BYTES 16 #define ECRYPTFS_DEFAULT_HASH "md5" #define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01 #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40 #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41 #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42 #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43 #define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename * as dentry name */ #define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in * metadata */ #define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as * dentry name */ #define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as * metadata */ #define ECRYPTFS_MIN_PKT_LEN_SIZE 1 /* Min size to specify packet length */ #define ECRYPTFS_MAX_PKT_LEN_SIZE 2 /* Pass at least this many bytes to * ecryptfs_parse_packet_length() and * ecryptfs_write_packet_length() */ /* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >= * ECRYPTFS_MAX_IV_BYTES */ #define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16 #define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */ #define MD5_DIGEST_SIZE 16 #define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE #define ECRYPTFS_TAG_70_MIN_METADATA_SIZE (1 + ECRYPTFS_MIN_PKT_LEN_SIZE \ + ECRYPTFS_SIG_SIZE + 1 + 1) #define ECRYPTFS_TAG_70_MAX_METADATA_SIZE (1 + ECRYPTFS_MAX_PKT_LEN_SIZE \ + ECRYPTFS_SIG_SIZE + 1 + 1) #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED." #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED." #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24 #define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32) #ifdef CONFIG_ECRYPT_FS_MESSAGING # define ECRYPTFS_VERSIONING_MASK_MESSAGING (ECRYPTFS_VERSIONING_DEVMISC \ | ECRYPTFS_VERSIONING_PUBKEY) #else # define ECRYPTFS_VERSIONING_MASK_MESSAGING 0 #endif #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \ | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \ | ECRYPTFS_VERSIONING_XATTR \ | ECRYPTFS_VERSIONING_MULTKEY \ | ECRYPTFS_VERSIONING_MASK_MESSAGING \ | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION) struct ecryptfs_key_sig { struct list_head crypt_stat_list; char keysig[ECRYPTFS_SIG_SIZE_HEX + 1]; }; struct ecryptfs_filename { struct list_head crypt_stat_list; #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001 u32 flags; u32 seq_no; char *filename; char *encrypted_filename; size_t filename_size; size_t encrypted_filename_size; char fnek_sig[ECRYPTFS_SIG_SIZE_HEX]; char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1]; }; /** * This is the primary struct associated with each encrypted file. * * TODO: cache align/pack? */ struct ecryptfs_crypt_stat { #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001 #define ECRYPTFS_POLICY_APPLIED 0x00000002 #define ECRYPTFS_ENCRYPTED 0x00000004 #define ECRYPTFS_SECURITY_WARNING 0x00000008 #define ECRYPTFS_ENABLE_HMAC 0x00000010 #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000020 #define ECRYPTFS_KEY_VALID 0x00000040 #define ECRYPTFS_METADATA_IN_XATTR 0x00000080 #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000100 #define ECRYPTFS_KEY_SET 0x00000200 #define ECRYPTFS_ENCRYPT_FILENAMES 0x00000400 #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800 #define ECRYPTFS_ENCFN_USE_FEK 0x00001000 #define ECRYPTFS_UNLINK_SIGS 0x00002000 #define ECRYPTFS_I_SIZE_INITIALIZED 0x00004000 u32 flags; unsigned int file_version; size_t iv_bytes; size_t metadata_size; size_t extent_size; /* Data extent size; default is 4096 */ size_t key_size; size_t extent_shift; unsigned int extent_mask; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; struct crypto_skcipher *tfm; struct crypto_shash *hash_tfm; /* Crypto context for generating * the initialization vectors */ unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; unsigned char key[ECRYPTFS_MAX_KEY_BYTES]; unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES]; struct list_head keysig_list; struct mutex keysig_list_mutex; struct mutex cs_tfm_mutex; struct mutex cs_mutex; }; /* inode private data. */ struct ecryptfs_inode_info { struct inode vfs_inode; struct inode *wii_inode; struct mutex lower_file_mutex; atomic_t lower_file_count; struct file *lower_file; struct ecryptfs_crypt_stat crypt_stat; }; /* dentry private data. Each dentry must keep track of a lower * vfsmount too. */ struct ecryptfs_dentry_info { struct path lower_path; union { struct ecryptfs_crypt_stat *crypt_stat; struct rcu_head rcu; }; }; /** * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint * @flags: Status flags * @mount_crypt_stat_list: These auth_toks hang off the mount-wide * cryptographic context. Every time a new * inode comes into existence, eCryptfs copies * the auth_toks on that list to the set of * auth_toks on the inode's crypt_stat * @global_auth_tok_key: The key from the user's keyring for the sig * @global_auth_tok: The key contents * @sig: The key identifier * * ecryptfs_global_auth_tok structs refer to authentication token keys * in the user keyring that apply to newly created files. A list of * these objects hangs off of the mount_crypt_stat struct for any * given eCryptfs mount. This struct maintains a reference to both the * key contents and the key itself so that the key can be put on * unmount. */ struct ecryptfs_global_auth_tok { #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001 #define ECRYPTFS_AUTH_TOK_FNEK 0x00000002 u32 flags; struct list_head mount_crypt_stat_list; struct key *global_auth_tok_key; unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1]; }; /** * ecryptfs_key_tfm - Persistent key tfm * @key_tfm: crypto API handle to the key * @key_size: Key size in bytes * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is * using the persistent TFM at any point in time * @key_tfm_list: Handle to hang this off the module-wide TFM list * @cipher_name: String name for the cipher for this TFM * * Typically, eCryptfs will use the same ciphers repeatedly throughout * the course of its operations. In order to avoid unnecessarily * destroying and initializing the same cipher repeatedly, eCryptfs * keeps a list of crypto API contexts around to use when needed. */ struct ecryptfs_key_tfm { struct crypto_skcipher *key_tfm; size_t key_size; struct mutex key_tfm_mutex; struct list_head key_tfm_list; unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; }; extern struct mutex key_tfm_list_mutex; /** * This struct is to enable a mount-wide passphrase/salt combo. This * is more or less a stopgap to provide similar functionality to other * crypto filesystems like EncFS or CFS until full policy support is * implemented in eCryptfs. */ struct ecryptfs_mount_crypt_stat { /* Pointers to memory we do not own, do not free these */ #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001 #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040 #define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY 0x00000080 u32 flags; struct list_head global_auth_tok_list; struct mutex global_auth_tok_list_mutex; size_t global_default_cipher_key_size; size_t global_default_fn_cipher_key_bytes; unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; unsigned char global_default_fn_cipher_name[ ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1]; }; /* superblock private data. */ struct ecryptfs_sb_info { struct super_block *wsi_sb; struct ecryptfs_mount_crypt_stat mount_crypt_stat; }; /* file private data. */ struct ecryptfs_file_info { struct file *wfi_file; struct ecryptfs_crypt_stat *crypt_stat; }; /* auth_tok <=> encrypted_session_key mappings */ struct ecryptfs_auth_tok_list_item { unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES]; struct list_head list; struct ecryptfs_auth_tok auth_tok; }; struct ecryptfs_message { /* Can never be greater than ecryptfs_message_buf_len */ /* Used to find the parent msg_ctx */ /* Inherits from msg_ctx->index */ u32 index; u32 data_len; u8 data[]; }; struct ecryptfs_msg_ctx { #define ECRYPTFS_MSG_CTX_STATE_FREE 0x01 #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02 #define ECRYPTFS_MSG_CTX_STATE_DONE 0x03 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04 u8 state; #define ECRYPTFS_MSG_HELO 100 #define ECRYPTFS_MSG_QUIT 101 #define ECRYPTFS_MSG_REQUEST 102 #define ECRYPTFS_MSG_RESPONSE 103 u8 type; u32 index; /* Counter converts to a sequence number. Each message sent * out for which we expect a response has an associated * sequence number. The response must have the same sequence * number as the counter for the msg_stc for the message to be * valid. */ u32 counter; size_t msg_size; struct ecryptfs_message *msg; struct task_struct *task; struct list_head node; struct list_head daemon_out_list; struct mutex mux; }; struct ecryptfs_daemon { #define ECRYPTFS_DAEMON_IN_READ 0x00000001 #define ECRYPTFS_DAEMON_IN_POLL 0x00000002 #define ECRYPTFS_DAEMON_ZOMBIE 0x00000004 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008 u32 flags; u32 num_queued_msg_ctx; struct file *file; struct mutex mux; struct list_head msg_ctx_out_queue; wait_queue_head_t wait; struct hlist_node euid_chain; }; #ifdef CONFIG_ECRYPT_FS_MESSAGING extern struct mutex ecryptfs_daemon_hash_mux; #endif
static inline size_t ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat) { if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) return 0; return crypt_stat->metadata_size; }

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static inline struct ecryptfs_file_info * ecryptfs_file_to_private(struct file *file) { return file->private_data; }

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static inline void ecryptfs_set_file_private(struct file *file, struct ecryptfs_file_info *file_info) { file->private_data = file_info; }

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static inline struct file *ecryptfs_file_to_lower(struct file *file) { return ((struct ecryptfs_file_info *)file->private_data)->wfi_file; }

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static inline void ecryptfs_set_file_lower(struct file *file, struct file *lower_file) { ((struct ecryptfs_file_info *)file->private_data)->wfi_file = lower_file; }

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static inline struct ecryptfs_inode_info * ecryptfs_inode_to_private(struct inode *inode) { return container_of(inode, struct ecryptfs_inode_info, vfs_inode); }

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static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode) { return ecryptfs_inode_to_private(inode)->wii_inode; }

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static inline void ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode) { ecryptfs_inode_to_private(inode)->wii_inode = lower_inode; }

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static inline struct ecryptfs_sb_info * ecryptfs_superblock_to_private(struct super_block *sb) { return (struct ecryptfs_sb_info *)sb->s_fs_info; }

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static inline void ecryptfs_set_superblock_private(struct super_block *sb, struct ecryptfs_sb_info *sb_info) { sb->s_fs_info = sb_info; }

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static inline struct super_block * ecryptfs_superblock_to_lower(struct super_block *sb) { return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb; }

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static inline void ecryptfs_set_superblock_lower(struct super_block *sb, struct super_block *lower_sb) { ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb; }

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static inline struct ecryptfs_dentry_info * ecryptfs_dentry_to_private(struct dentry *dentry) { return (struct ecryptfs_dentry_info *)dentry->d_fsdata; }

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static inline void ecryptfs_set_dentry_private(struct dentry *dentry, struct ecryptfs_dentry_info *dentry_info) { dentry->d_fsdata = dentry_info; }

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static inline struct dentry * ecryptfs_dentry_to_lower(struct dentry *dentry) { return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry; }

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static inline struct vfsmount * ecryptfs_dentry_to_lower_mnt(struct dentry *dentry) { return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt; }

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static inline struct path * ecryptfs_dentry_to_lower_path(struct dentry *dentry) { return &((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path; }

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#define ecryptfs_printk(type, fmt, arg...) \ __ecryptfs_printk(type "%s: " fmt, __func__, ## arg); __printf(1, 2) void __ecryptfs_printk(const char *fmt, ...); extern const struct file_operations ecryptfs_main_fops; extern const struct file_operations ecryptfs_dir_fops; extern const struct inode_operations ecryptfs_main_iops; extern const struct inode_operations ecryptfs_dir_iops; extern const struct inode_operations ecryptfs_symlink_iops; extern const struct super_operations ecryptfs_sops; extern const struct dentry_operations ecryptfs_dops; extern const struct address_space_operations ecryptfs_aops; extern int ecryptfs_verbosity; extern unsigned int ecryptfs_message_buf_len; extern signed long ecryptfs_message_wait_timeout; extern unsigned int ecryptfs_number_of_users; extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache; extern struct kmem_cache *ecryptfs_file_info_cache; extern struct kmem_cache *ecryptfs_dentry_info_cache; extern struct kmem_cache *ecryptfs_inode_info_cache; extern struct kmem_cache *ecryptfs_sb_info_cache; extern struct kmem_cache *ecryptfs_header_cache; extern struct kmem_cache *ecryptfs_xattr_cache; extern struct kmem_cache *ecryptfs_key_record_cache; extern struct kmem_cache *ecryptfs_key_sig_cache; extern struct kmem_cache *ecryptfs_global_auth_tok_cache; extern struct kmem_cache *ecryptfs_key_tfm_cache; struct inode *ecryptfs_get_inode(struct inode *lower_inode, struct super_block *sb); void ecryptfs_i_size_init(const char *page_virt, struct inode *inode); int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, struct inode *ecryptfs_inode); int ecryptfs_decode_and_decrypt_filename(char **decrypted_name, size_t *decrypted_name_size, struct super_block *sb, const char *name, size_t name_size); int ecryptfs_fill_zeros(struct file *file, loff_t new_length); int ecryptfs_encrypt_and_encode_filename( char **encoded_name, size_t *encoded_name_size, struct ecryptfs_mount_crypt_stat *mount_crypt_stat, const char *name, size_t name_size); struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry); void ecryptfs_dump_hex(char *data, int bytes); int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, int sg_size); int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat); void ecryptfs_rotate_iv(unsigned char *iv); int ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); void ecryptfs_destroy_mount_crypt_stat( struct ecryptfs_mount_crypt_stat *mount_crypt_stat); int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat); int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode); int ecryptfs_encrypt_page(struct page *page); int ecryptfs_decrypt_page(struct page *page); int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry, struct inode *ecryptfs_inode); int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry); int ecryptfs_new_file_context(struct inode *ecryptfs_inode); void ecryptfs_write_crypt_stat_flags(char *page_virt, struct ecryptfs_crypt_stat *crypt_stat, size_t *written); int ecryptfs_read_and_validate_header_region(struct inode *inode); int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry, struct inode *inode); u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes); int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code); void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat); int ecryptfs_generate_key_packet_set(char *dest_base, struct ecryptfs_crypt_stat *crypt_stat, struct dentry *ecryptfs_dentry, size_t *len, size_t max); int ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, unsigned char *src, struct dentry *ecryptfs_dentry); int ecryptfs_truncate(struct dentry *dentry, loff_t new_length); ssize_t ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, const char *name, void *value, size_t size); int ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name, const void *value, size_t size, int flags); int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode); #ifdef CONFIG_ECRYPT_FS_MESSAGING int ecryptfs_process_response(struct ecryptfs_daemon *daemon, struct ecryptfs_message *msg, u32 seq); int ecryptfs_send_message(char *data, int data_len, struct ecryptfs_msg_ctx **msg_ctx); int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, struct ecryptfs_message **emsg); int ecryptfs_init_messaging(void); void ecryptfs_release_messaging(void); #else
static inline int ecryptfs_init_messaging(void) { return 0; }

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static inline void ecryptfs_release_messaging(void) { }

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static inline int ecryptfs_send_message(char *data, int data_len, struct ecryptfs_msg_ctx **msg_ctx) { return -ENOTCONN; }

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static inline int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, struct ecryptfs_message **emsg) { return -ENOMSG; }

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#endif void ecryptfs_write_header_metadata(char *virt, struct ecryptfs_crypt_stat *crypt_stat, size_t *written); int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig); int ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig, u32 global_auth_tok_flags); int ecryptfs_get_global_auth_tok_for_sig( struct ecryptfs_global_auth_tok **global_auth_tok, struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig); int ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name, size_t key_size); int ecryptfs_init_crypto(void); int ecryptfs_destroy_crypto(void); int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm); int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_skcipher **tfm, struct mutex **tfm_mutex, char *cipher_name); int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key, struct ecryptfs_auth_tok **auth_tok, char *sig); int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data, loff_t offset, size_t size); int ecryptfs_write_lower_page_segment