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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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23 * Copyright (c) 2019, 2020, Whamcloud.
26 * This file is part of Lustre, http://www.lustre.org/
29 #ifndef _LUSTRE_CRYPTO_H_
30 #define _LUSTRE_CRYPTO_H_
33 int ll_set_encflags(struct inode *inode, void *encctx, __u32 encctxlen,
35 void llcrypt_free_ctx(void *encctx, __u32 size);
36 bool ll_sbi_has_test_dummy_encryption(struct ll_sb_info *sbi);
37 bool ll_sbi_has_encrypt(struct ll_sb_info *sbi);
38 void ll_sbi_set_encrypt(struct ll_sb_info *sbi, bool set);
39 /* sizeof(struct fscrypt_context_v2) = 40 */
40 #define LLCRYPT_ENC_CTX_SIZE 40
43 /* Encoding/decoding routines inspired from yEnc principles.
44 * We just take care of a few critical characters:
45 * NULL, LF, CR, /, DEL and =.
46 * If such a char is found, it is replaced with '=' followed by
47 * the char value + 64.
48 * All other chars are left untouched.
49 * Efficiency of this encoding depends on the occurences of the
50 * critical chars, but statistically on binary data it can be much higher
51 * than base64 for instance.
53 static inline int critical_encode(const u8 *src, int len, char *dst)
55 u8 *p = (u8 *)src, *q = dst;
57 while (p - src < len) {
58 /* escape NULL, LF, CR, /, DEL and = */
59 if (unlikely(*p == 0x0 || *p == 0xA || *p == 0xD ||
60 *p == '/' || *p == 0x7F || *p == '=')) {
68 return (char *)q - dst;
71 /* returns the number of chars encoding would produce */
72 static inline int critical_chars(const u8 *src, int len)
77 while (p - src < len) {
78 /* NULL, LF, CR, /, DEL and = cost an additional '=' */
79 if (unlikely(*p == 0x0 || *p == 0xA || *p == 0xD ||
80 *p == '/' || *p == 0x7F || *p == '='))
88 /* decoding routine - returns the number of chars in output */
89 static inline int critical_decode(const u8 *src, int len, char *dst)
91 u8 *p = (u8 *)src, *q = dst;
93 while (p - src < len) {
94 if (unlikely(*p == '=')) {
102 return (char *)q - dst;
105 #ifdef CONFIG_LL_ENCRYPTION
106 #include <libcfs/crypto/llcrypt.h>
107 #else /* !CONFIG_LL_ENCRYPTION */
108 #ifdef HAVE_LUSTRE_CRYPTO
109 #define __FS_HAS_ENCRYPTION 1
110 #include <linux/fscrypt.h>
112 #define llcrypt_operations fscrypt_operations
113 #define llcrypt_symlink_data fscrypt_symlink_data
114 #define llcrypt_dummy_context_enabled(inode) \
115 fscrypt_dummy_context_enabled(inode)
116 #define llcrypt_has_encryption_key(inode) fscrypt_has_encryption_key(inode)
117 #define llcrypt_encrypt_pagecache_blocks(page, len, offs, gfp_flags) \
118 fscrypt_encrypt_pagecache_blocks(page, len, offs, gfp_flags)
119 #define llcrypt_encrypt_block_inplace(inode, page, len, offs, lblk, gfp_flags) \
120 fscrypt_encrypt_block_inplace(inode, page, len, offs, lblk, gfp_flags)
121 #define llcrypt_decrypt_pagecache_blocks(page, len, offs) \
122 fscrypt_decrypt_pagecache_blocks(page, len, offs)
123 #define llcrypt_decrypt_block_inplace(inode, page, len, offs, lblk_num) \
124 fscrypt_decrypt_block_inplace(inode, page, len, offs, lblk_num)
125 #define llcrypt_inherit_context(parent, child, fs_data, preload) \
126 fscrypt_inherit_context(parent, child, fs_data, preload)
127 #define llcrypt_get_encryption_info(inode) fscrypt_get_encryption_info(inode)
128 #define llcrypt_put_encryption_info(inode) fscrypt_put_encryption_info(inode)
129 #define llcrypt_free_inode(inode) fscrypt_free_inode(inode)
130 #define llcrypt_finalize_bounce_page(pagep) fscrypt_finalize_bounce_page(pagep)
131 #define llcrypt_file_open(inode, filp) fscrypt_file_open(inode, filp)
132 #define llcrypt_ioctl_set_policy(filp, arg) fscrypt_ioctl_set_policy(filp, arg)
133 #define llcrypt_ioctl_get_policy_ex(filp, arg) \
134 fscrypt_ioctl_get_policy_ex(filp, arg)
135 #define llcrypt_policy_has_filename_enc(inode) true
136 #define llcrypt_ioctl_add_key(filp, arg) fscrypt_ioctl_add_key(filp, arg)
137 #define llcrypt_ioctl_remove_key(filp, arg) fscrypt_ioctl_remove_key(filp, arg)
138 #define llcrypt_ioctl_remove_key_all_users(filp, arg) \
139 fscrypt_ioctl_remove_key_all_users(filp, arg)
140 #define llcrypt_ioctl_get_key_status(filp, arg) \
141 fscrypt_ioctl_get_key_status(filp, arg)
142 #define llcrypt_drop_inode(inode) fscrypt_drop_inode(inode)
143 #define llcrypt_prepare_rename(olddir, olddentry, newdir, newdentry, flags) \
144 fscrypt_prepare_rename(olddir, olddentry, newdir, newdentry, flags)
145 #define llcrypt_prepare_link(old_dentry, dir, dentry) \
146 fscrypt_prepare_link(old_dentry, dir, dentry)
147 #define llcrypt_prepare_setattr(dentry, attr) \
148 fscrypt_prepare_setattr(dentry, attr)
149 #define llcrypt_set_ops(sb, cop) fscrypt_set_ops(sb, cop)
150 #define llcrypt_fname_alloc_buffer(inode, max_encrypted_len, crypto_str) \
151 fscrypt_fname_alloc_buffer(inode, max_encrypted_len, crypto_str)
152 #define llcrypt_fname_disk_to_usr(inode, hash, minor_hash, iname, oname) \
153 fscrypt_fname_disk_to_usr(inode, hash, minor_hash, iname, oname)
154 #define llcrypt_fname_free_buffer(crypto_str) \
155 fscrypt_fname_free_buffer(crypto_str)
156 #define llcrypt_setup_filename(dir, iname, lookup, fname) \
157 fscrypt_setup_filename(dir, iname, lookup, fname)
158 #define llcrypt_free_filename(fname) \
159 fscrypt_free_filename(fname)
160 #define llcrypt_prepare_lookup(dir, dentry, fname) \
161 fscrypt_prepare_lookup(dir, dentry, fname)
162 #define llcrypt_encrypt_symlink(inode, target, len, disk_link) \
163 fscrypt_encrypt_symlink(inode, target, len, disk_link)
164 #define llcrypt_prepare_symlink(dir, target, len, max_len, disk_link) \
165 fscrypt_prepare_symlink(dir, target, len, max_len, disk_link)
166 #define llcrypt_get_symlink(inode, caddr, max_size, done) \
167 fscrypt_get_symlink(inode, caddr, max_size, done)
168 #define llcrypt_handle_d_move(dentry) \
169 fscrypt_handle_d_move(dentry)
170 #else /* !HAVE_LUSTRE_CRYPTO */
171 /* Extracts the second-to-last ciphertext block */
172 #define LLCRYPT_FNAME_DIGEST(name, len) \
173 ((name) + round_down((len) - LL_CRYPTO_BLOCK_SIZE - 1, \
174 LL_CRYPTO_BLOCK_SIZE))
175 #define LLCRYPT_FNAME_DIGEST_SIZE LL_CRYPTO_BLOCK_SIZE
176 #include <libcfs/crypto/llcrypt.h>
177 #endif /* HAVE_LUSTRE_CRYPTO */
178 #endif /* !CONFIG_LL_ENCRYPTION */
180 #endif /* _LUSTRE_CRYPTO_H_ */