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 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) {} 70 static inline void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap) {} 71 static inline void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all) {} 72 static inline void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map) {} 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