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-rw-r--r--drivers/md/dm-ima.h77
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/md/dm-ima.h b/drivers/md/dm-ima.h
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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_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 */