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/* 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_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) ";"
enum dm_ima_table_op {
DM_IMA_TABLE_SAVE,
DM_IMA_TABLE_RESTORE,
};
#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;
sector_t capacity;
/*
* 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;
};
struct dm_ima_context {
struct dm_ima_device_table_metadata table;
unsigned int update_idx;
char dev_name[DM_NAME_LEN*2];
char dev_uuid[DM_UUID_LEN*2];
};
/*
* This structure contains device metadata, and table hash for
* active and inactive tables for ima measurements.
*/
struct dm_ima_measurements {
unsigned int update_idx;
unsigned int measure_idx;
struct wait_queue_head ima_wq;
spinlock_t ima_lock;
struct dm_ima_device_table_metadata active_table;
struct dm_ima_device_table_metadata inactive_table;
};
void dm_ima_init(struct mapped_device *md);
void dm_ima_alloc_context(struct dm_ima_context **context, bool noio);
void dm_ima_free_context(struct dm_ima_context *context);
void dm_ima_context_table_op(struct mapped_device *md,
struct dm_ima_context *context,
enum dm_ima_table_op op);
void dm_ima_measure_on_table_load(struct dm_table *table,
struct dm_ima_context *context);
void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap,
struct dm_ima_context *context);
void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all,
struct dm_ima_context *context,
unsigned int idx);
void dm_ima_measure_on_table_clear(struct mapped_device *md,
struct dm_ima_context *context);
void dm_ima_measure_on_device_rename(struct mapped_device *md,
struct dm_ima_context *context);
#else
struct dm_ima_context;
static inline void dm_ima_init(struct mapped_device *md) {}
static inline void dm_ima_alloc_context(struct dm_ima_context **context, bool noio) {}
static inline void dm_ima_free_context(struct dm_ima_context *context) {}
static inline void dm_ima_context_table_op(struct mapped_device *md,
struct dm_ima_context *context,
enum dm_ima_table_op op) {}
static inline void dm_ima_measure_on_table_load(struct dm_table *table,
struct dm_ima_context *context) {}
static inline void dm_ima_measure_on_device_resume(struct mapped_device *md,
bool swap,
struct dm_ima_context *context) {}
static inline void dm_ima_measure_on_device_remove(struct mapped_device *md,
bool remove_all,
struct dm_ima_context *context,
unsigned int idx) {}
static inline void dm_ima_measure_on_table_clear(struct mapped_device *md,
struct dm_ima_context *context) {}
static inline void dm_ima_measure_on_device_rename(struct mapped_device *md,
struct dm_ima_context *context) {}
#endif /* CONFIG_IMA */
#endif /* DM_IMA_H */
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