78 lines · c
1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Copyright (C) 2021 Microsoft Corporation4 *5 * Author: Tushar Sugandhi <tusharsu@linux.microsoft.com>6 *7 * Header file for device mapper IMA measurements.8 */9 10#ifndef DM_IMA_H11#define DM_IMA_H12 13#define DM_IMA_MEASUREMENT_BUF_LEN 409614#define DM_IMA_DEVICE_BUF_LEN 102415#define DM_IMA_TARGET_METADATA_BUF_LEN 12816#define DM_IMA_TARGET_DATA_BUF_LEN 204817#define DM_IMA_DEVICE_CAPACITY_BUF_LEN 12818#define DM_IMA_TABLE_HASH_ALG "sha256"19 20#define __dm_ima_stringify(s) #s21#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_IMA29 30struct dm_ima_device_table_metadata {31 /*32 * Contains data specific to the device which is common across33 * 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 target43 * 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 for51 * active and inactive tables for ima measurements.52 */53struct 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 59void dm_ima_reset_data(struct mapped_device *md);60void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags);61void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap);62void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all);63void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map);64void dm_ima_measure_on_device_rename(struct mapped_device *md);65 66#else67 68static inline void dm_ima_reset_data(struct mapped_device *md) {}69static inline void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags) {}70static inline void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap) {}71static inline void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all) {}72static inline void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map) {}73static inline void dm_ima_measure_on_device_rename(struct mapped_device *md) {}74 75#endif /* CONFIG_IMA */76 77#endif /* DM_IMA_H */78