2 * libdevmapper - device-mapper backend for cryptsetup
4 * Copyright (C) 2004, Christophe Saout <christophe@saout.de>
5 * Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
6 * Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved.
7 * Copyright (C) 2009-2012, Milan Broz
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 /* device-mapper library helpers */
32 struct crypt_params_verity;
35 /* Device mapper backend - kernel support flags */
36 #define DM_KEY_WIPE_SUPPORTED (1 << 0) /* key wipe message */
37 #define DM_LMK_SUPPORTED (1 << 1) /* lmk mode */
38 #define DM_SECURE_SUPPORTED (1 << 2) /* wipe (secure) buffer flag */
39 #define DM_PLAIN64_SUPPORTED (1 << 3) /* plain64 IV */
40 #define DM_DISCARDS_SUPPORTED (1 << 4) /* discards/TRIM option is supported */
41 #define DM_VERITY_SUPPORTED (1 << 5) /* dm-verity target supported */
42 uint32_t dm_flags(void);
44 #define DM_ACTIVE_DEVICE (1 << 0)
45 #define DM_ACTIVE_UUID (1 << 1)
47 #define DM_ACTIVE_CRYPT_CIPHER (1 << 2)
48 #define DM_ACTIVE_CRYPT_KEYSIZE (1 << 3)
49 #define DM_ACTIVE_CRYPT_KEY (1 << 4)
51 #define DM_ACTIVE_VERITY_ROOT_HASH (1 << 5)
52 #define DM_ACTIVE_VERITY_HASH_DEVICE (1 << 6)
53 #define DM_ACTIVE_VERITY_PARAMS (1 << 7)
55 struct crypt_dm_active_device {
56 enum { DM_CRYPT = 0, DM_VERITY } target;
57 uint64_t size; /* active device size */
58 uint32_t flags; /* activation flags */
60 struct device *data_device;
65 /* Active key for device */
66 struct volume_key *vk;
68 /* struct crypt_active_device */
69 uint64_t offset; /* offset in sectors */
70 uint64_t iv_offset; /* IV initilisation sector */
73 struct device *hash_device;
75 const char *root_hash;
76 uint32_t root_hash_size;
78 uint64_t hash_offset; /* hash offset in blocks (not header) */
79 struct crypt_params_verity *vp;
84 void dm_backend_init(void);
85 void dm_backend_exit(void);
87 int dm_remove_device(struct crypt_device *cd, const char *name,
88 int force, uint64_t size);
89 int dm_status_device(struct crypt_device *cd, const char *name);
90 int dm_status_suspended(struct crypt_device *cd, const char *name);
91 int dm_status_verity_ok(struct crypt_device *cd, const char *name);
92 int dm_query_device(struct crypt_device *cd, const char *name,
93 uint32_t get_flags, struct crypt_dm_active_device *dmd);
94 int dm_create_device(struct crypt_device *cd, const char *name,
95 const char *type, struct crypt_dm_active_device *dmd,
97 int dm_suspend_and_wipe_key(struct crypt_device *cd, const char *name);
98 int dm_resume_and_reinstate_key(struct crypt_device *cd, const char *name,
99 size_t key_size, const char *key);
101 const char *dm_get_dir(void);
103 /* These are DM helpers used only by utils_devpath file */
104 int dm_is_dm_device(int major, int minor);
105 int dm_is_dm_kernel_name(const char *name);
106 char *dm_device_path(const char *prefix, int major, int minor);
108 #endif /* _UTILS_DM_H */