1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2021 Microsoft Corporation
4 *
5 * Author: Tushar Sugandhi <tusharsu@linux.microsoft.com>
6 *
7 * Header file for device mapper IMA measurements.
8 */
9
10 #ifndef DM_IMA_H
11 #define DM_IMA_H
12
13 #define DM_IMA_MEASUREMENT_BUF_LEN 4096
14 #define DM_IMA_DEVICE_BUF_LEN 1024
15 #define DM_IMA_TARGET_METADATA_BUF_LEN 128
16 #define DM_IMA_TARGET_DATA_BUF_LEN 2048
17 #define DM_IMA_DEVICE_CAPACITY_BUF_LEN 128
18 #define DM_IMA_TABLE_HASH_ALG "sha256"
19
20 #define __dm_ima_stringify(s) #s
21 #define __dm_ima_str(s) __dm_ima_stringify(s)
22
23 #define DM_IMA_VERSION_STR "dm_version=" \
24 __dm_ima_str(DM_VERSION_MAJOR) "." \
25 __dm_ima_str(DM_VERSION_MINOR) "." \
26 __dm_ima_str(DM_VERSION_PATCHLEVEL) ";"
27
28 #ifdef CONFIG_IMA
29
30 struct dm_ima_device_table_metadata {
31 /*
32 * Contains data specific to the device which is common across
33 * all the targets in the table (e.g. name, uuid, major, minor, etc).
34 * The values are stored in comma separated list of key1=val1,key2=val2;
35 * pairs delimited by a semicolon at the end of the list.
36 */
37 char *device_metadata;
38 unsigned int device_metadata_len;
39 unsigned int num_targets;
40
41 /*
42 * Contains the sha256 hashes of the IMA measurements of the target
43 * attributes' key-value pairs from the active/inactive tables.
44 */
45 char *hash;
46 unsigned int hash_len;
47 };
48
49 /*
50 * This structure contains device metadata, and table hash for
51 * active and inactive tables for ima measurements.
52 */
53 struct dm_ima_measurements {
54 struct dm_ima_device_table_metadata active_table;
55 struct dm_ima_device_table_metadata inactive_table;
56 unsigned int dm_version_str_len;
57 };
58
59 void dm_ima_reset_data(struct mapped_device *md);
60 void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags);
61 void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap);
62 void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all);
63 void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map);
64 void dm_ima_measure_on_device_rename(struct mapped_device *md);
65
66 #else
67
dm_ima_reset_data(struct mapped_device * md)68 static inline void dm_ima_reset_data(struct mapped_device *md) {}
dm_ima_measure_on_table_load(struct dm_table * table,unsigned int status_flags)69 static inline void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags) {}
dm_ima_measure_on_device_resume(struct mapped_device * md,bool swap)70 static inline void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap) {}
dm_ima_measure_on_device_remove(struct mapped_device * md,bool remove_all)71 static inline void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all) {}
dm_ima_measure_on_table_clear(struct mapped_device * md,bool new_map)72 static inline void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map) {}
dm_ima_measure_on_device_rename(struct mapped_device * md)73 static inline void dm_ima_measure_on_device_rename(struct mapped_device *md) {}
74
75 #endif /* CONFIG_IMA */
76
77 #endif /* DM_IMA_H */
78