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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2021 Microsoft Corporation
*
* Author: Tushar Sugandhi <tusharsu@linux.microsoft.com>
*
* File: dm-ima.h
* 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 */
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