[linux-block.git] / drivers / md / dm-ima.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2021 Microsoft Corporation
 *
 * Author: Tushar Sugandhi <tusharsu@linux.microsoft.com>
 *
 * Header file for device mapper IMA measurements.
 */

#ifndef DM_IMA_H
#define DM_IMA_H

#define DM_IMA_MEASUREMENT_BUF_LEN	4096
#define DM_IMA_DEVICE_BUF_LEN		1024
#define DM_IMA_TARGET_METADATA_BUF_LEN	128
#define DM_IMA_TARGET_DATA_BUF_LEN	2048
#define DM_IMA_DEVICE_CAPACITY_BUF_LEN	128
#define DM_IMA_TABLE_HASH_ALG		"sha256"

#define __dm_ima_stringify(s) #s
#define __dm_ima_str(s) __dm_ima_stringify(s)

#define DM_IMA_VERSION_STR "dm_version="	\
	__dm_ima_str(DM_VERSION_MAJOR) "."	\
	__dm_ima_str(DM_VERSION_MINOR) "."	\
	__dm_ima_str(DM_VERSION_PATCHLEVEL) ";"

#ifdef CONFIG_IMA

struct dm_ima_device_table_metadata {
	/*
	 * Contains data specific to the device which is common across
	 * all the targets in the table (e.g. name, uuid, major, minor, etc).
	 * The values are stored in comma separated list of key1=val1,key2=val2;
	 * pairs delimited by a semicolon at the end of the list.
	 */
	char *device_metadata;
	unsigned int device_metadata_len;
	unsigned int num_targets;

	/*
	 * Contains the sha256 hashes of the IMA measurements of the target
	 * attributes' key-value pairs from the active/inactive tables.
	 */
	char *hash;
	unsigned int hash_len;
};

/*
 * This structure contains device metadata, and table hash for
 * active and inactive tables for ima measurements.
 */
struct dm_ima_measurements {
	struct dm_ima_device_table_metadata active_table;
	struct dm_ima_device_table_metadata inactive_table;
	unsigned int dm_version_str_len;
};

void dm_ima_reset_data(struct mapped_device *md);
void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags);
void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap);
void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all);
void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map);
void dm_ima_measure_on_device_rename(struct mapped_device *md);

#else

static inline void dm_ima_reset_data(struct mapped_device *md) {}
static inline void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags) {}
static inline void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap) {}
static inline void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all) {}
static inline void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map) {}
static inline void dm_ima_measure_on_device_rename(struct mapped_device *md) {}

#endif /* CONFIG_IMA */

#endif /* DM_IMA_H */
Commit	Line	Data
3bd94003 HM	1	/* SPDX-License-Identifier: GPL-2.0-only */
3bd94003 HM	2	/*
91ccbbac TS	3	* Copyright (C) 2021 Microsoft Corporation
	4	*
	5	* Author: Tushar Sugandhi <tusharsu@linux.microsoft.com>
	6	*
9bfeac5d	7	* Header file for device mapper IMA measurements.
91ccbbac TS	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
8eb6fab4	17	#define DM_IMA_DEVICE_CAPACITY_BUF_LEN 128
8f509fd4	18	#define DM_IMA_TABLE_HASH_ALG "sha256"
91ccbbac	19
dc7b79cc TS	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
91ccbbac TS	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;
dc7b79cc	56	unsigned int dm_version_str_len;
91ccbbac TS	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);
8eb6fab4	61	void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap);
84010e51	62	void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all);
99169b93	63	void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map);
7d1d1df8	64	void dm_ima_measure_on_device_rename(struct mapped_device *md);
91ccbbac TS	65
	66	#else
	67
	68	static inline void dm_ima_reset_data(struct mapped_device *md) {}
	69	static inline void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags) {}
8eb6fab4	70	static inline void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap) {}
84010e51	71	static inline void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all) {}
99169b93	72	static inline void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map) {}
7d1d1df8	73	static inline void dm_ima_measure_on_device_rename(struct mapped_device *md) {}
91ccbbac TS	74
	75	#endif /* CONFIG_IMA */
	76
	77	#endif /* DM_IMA_H */