/* * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 only, * as published by the Free Software Foundation. * * 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 version 2 for more details (a copy is included * in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ /* * Copyright (c) 2019, 2020, Whamcloud. */ /* * This file is part of Lustre, http://www.lustre.org/ */ #ifndef _LUSTRE_CRYPTO_H_ #define _LUSTRE_CRYPTO_H_ struct ll_sb_info; int ll_set_encflags(struct inode *inode, void *encctx, __u32 encctxlen, bool preload); void llcrypt_free_ctx(void *encctx, __u32 size); bool ll_sbi_has_test_dummy_encryption(struct ll_sb_info *sbi); bool ll_sbi_has_encrypt(struct ll_sb_info *sbi); void ll_sbi_set_encrypt(struct ll_sb_info *sbi, bool set); /* sizeof(struct fscrypt_context_v2) = 40 */ #define LLCRYPT_ENC_CTX_SIZE 40 /* Encoding/decoding routines inspired from yEnc principles. * We just take care of a few critical characters: * NULL, LF, CR, /, DEL and =. * If such a char is found, it is replaced with '=' followed by * the char value + 64. * All other chars are left untouched. * Efficiency of this encoding depends on the occurences of the * critical chars, but statistically on binary data it can be much higher * than base64 for instance. */ static inline int critical_encode(const u8 *src, int len, char *dst) { u8 *p = (u8 *)src, *q = dst; while (p - src < len) { /* escape NULL, LF, CR, /, DEL and = */ if (unlikely(*p == 0x0 || *p == 0xA || *p == 0xD || *p == '/' || *p == 0x7F || *p == '=')) { *(q++) = '='; *(q++) = *(p++) + 64; } else { *(q++) = *(p++); } } return (char *)q - dst; } /* returns the number of chars encoding would produce */ static inline int critical_chars(const u8 *src, int len) { u8 *p = (u8 *)src; int newlen = len; while (p - src < len) { /* NULL, LF, CR, /, DEL and = cost an additional '=' */ if (unlikely(*p == 0x0 || *p == 0xA || *p == 0xD || *p == '/' || *p == 0x7F || *p == '=')) newlen++; p++; } return newlen; } /* decoding routine - returns the number of chars in output */ static inline int critical_decode(const u8 *src, int len, char *dst) { u8 *p = (u8 *)src, *q = dst; while (p - src < len) { if (unlikely(*p == '=')) { *(q++) = *(++p) - 64; p++; } else { *(q++) = *(p++); } } return (char *)q - dst; } #ifdef CONFIG_LL_ENCRYPTION #include #else /* !CONFIG_LL_ENCRYPTION */ #ifdef HAVE_LUSTRE_CRYPTO #define __FS_HAS_ENCRYPTION 1 #include #define llcrypt_operations fscrypt_operations #define llcrypt_symlink_data fscrypt_symlink_data #define llcrypt_dummy_context_enabled(inode) \ fscrypt_dummy_context_enabled(inode) #define llcrypt_has_encryption_key(inode) fscrypt_has_encryption_key(inode) #define llcrypt_encrypt_pagecache_blocks(page, len, offs, gfp_flags) \ fscrypt_encrypt_pagecache_blocks(page, len, offs, gfp_flags) #define llcrypt_encrypt_block_inplace(inode, page, len, offs, lblk, gfp_flags) \ fscrypt_encrypt_block_inplace(inode, page, len, offs, lblk, gfp_flags) #define llcrypt_decrypt_pagecache_blocks(page, len, offs) \ fscrypt_decrypt_pagecache_blocks(page, len, offs) #define llcrypt_decrypt_block_inplace(inode, page, len, offs, lblk_num) \ fscrypt_decrypt_block_inplace(inode, page, len, offs, lblk_num) #define llcrypt_inherit_context(parent, child, fs_data, preload) \ fscrypt_inherit_context(parent, child, fs_data, preload) #define llcrypt_get_encryption_info(inode) fscrypt_get_encryption_info(inode) #define llcrypt_put_encryption_info(inode) fscrypt_put_encryption_info(inode) #define llcrypt_free_inode(inode) fscrypt_free_inode(inode) #define llcrypt_finalize_bounce_page(pagep) fscrypt_finalize_bounce_page(pagep) #define llcrypt_file_open(inode, filp) fscrypt_file_open(inode, filp) #define llcrypt_ioctl_set_policy(filp, arg) fscrypt_ioctl_set_policy(filp, arg) #define llcrypt_ioctl_get_policy_ex(filp, arg) \ fscrypt_ioctl_get_policy_ex(filp, arg) #define llcrypt_ioctl_add_key(filp, arg) fscrypt_ioctl_add_key(filp, arg) #define llcrypt_ioctl_remove_key(filp, arg) fscrypt_ioctl_remove_key(filp, arg) #define llcrypt_ioctl_remove_key_all_users(filp, arg) \ fscrypt_ioctl_remove_key_all_users(filp, arg) #define llcrypt_ioctl_get_key_status(filp, arg) \ fscrypt_ioctl_get_key_status(filp, arg) #define llcrypt_drop_inode(inode) fscrypt_drop_inode(inode) #define llcrypt_prepare_rename(olddir, olddentry, newdir, newdentry, flags) \ fscrypt_prepare_rename(olddir, olddentry, newdir, newdentry, flags) #define llcrypt_prepare_link(old_dentry, dir, dentry) \ fscrypt_prepare_link(old_dentry, dir, dentry) #define llcrypt_prepare_setattr(dentry, attr) \ fscrypt_prepare_setattr(dentry, attr) #define llcrypt_set_ops(sb, cop) fscrypt_set_ops(sb, cop) #define llcrypt_fname_alloc_buffer(inode, max_encrypted_len, crypto_str) \ fscrypt_fname_alloc_buffer(inode, max_encrypted_len, crypto_str) #define llcrypt_fname_disk_to_usr(inode, hash, minor_hash, iname, oname) \ fscrypt_fname_disk_to_usr(inode, hash, minor_hash, iname, oname) #define llcrypt_fname_free_buffer(crypto_str) \ fscrypt_fname_free_buffer(crypto_str) #define llcrypt_setup_filename(dir, iname, lookup, fname) \ fscrypt_setup_filename(dir, iname, lookup, fname) #define llcrypt_free_filename(fname) \ fscrypt_free_filename(fname) #define llcrypt_prepare_lookup(dir, dentry, fname) \ fscrypt_prepare_lookup(dir, dentry, fname) #define llcrypt_encrypt_symlink(inode, target, len, disk_link) \ fscrypt_encrypt_symlink(inode, target, len, disk_link) #define llcrypt_prepare_symlink(dir, target, len, max_len, disk_link) \ fscrypt_prepare_symlink(dir, target, len, max_len, disk_link) #define llcrypt_get_symlink(inode, caddr, max_size, done) \ fscrypt_get_symlink(inode, caddr, max_size, done) #define llcrypt_handle_d_move(dentry) \ fscrypt_handle_d_move(dentry) #else /* !HAVE_LUSTRE_CRYPTO */ /* Extracts the second-to-last ciphertext block */ #define LLCRYPT_FNAME_DIGEST(name, len) \ ((name) + round_down((len) - LL_CRYPTO_BLOCK_SIZE - 1, \ LL_CRYPTO_BLOCK_SIZE)) #define LLCRYPT_FNAME_DIGEST_SIZE LL_CRYPTO_BLOCK_SIZE #include #endif /* HAVE_LUSTRE_CRYPTO */ #endif /* !CONFIG_LL_ENCRYPTION */ #endif /* _LUSTRE_CRYPTO_H_ */