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| -rw-r--r-- | lib/utils_dm.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/lib/utils_dm.h b/lib/utils_dm.h new file mode 100644 index 0000000..3d2d07d --- /dev/null +++ b/lib/utils_dm.h @@ -0,0 +1,204 @@ +/* + * libdevmapper - device-mapper backend for cryptsetup + * + * Copyright (C) 2004 Jana Saout <jana@saout.de> + * Copyright (C) 2004-2007 Clemens Fruhwirth <clemens@endorphin.org> + * Copyright (C) 2009-2019 Red Hat, Inc. All rights reserved. + * Copyright (C) 2009-2019 Milan Broz + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef _UTILS_DM_H +#define _UTILS_DM_H + +/* device-mapper library helpers */ +#include <inttypes.h> + +struct crypt_device; +struct volume_key; +struct crypt_params_verity; +struct device; +struct crypt_params_integrity; + +/* Device mapper backend - kernel support flags */ +#define DM_KEY_WIPE_SUPPORTED (1 << 0) /* key wipe message */ +#define DM_LMK_SUPPORTED (1 << 1) /* lmk mode */ +#define DM_SECURE_SUPPORTED (1 << 2) /* wipe (secure) buffer flag */ +#define DM_PLAIN64_SUPPORTED (1 << 3) /* plain64 IV */ +#define DM_DISCARDS_SUPPORTED (1 << 4) /* discards/TRIM option is supported */ +#define DM_VERITY_SUPPORTED (1 << 5) /* dm-verity target supported */ +#define DM_TCW_SUPPORTED (1 << 6) /* tcw (TCRYPT CBC with whitening) */ +#define DM_SAME_CPU_CRYPT_SUPPORTED (1 << 7) /* same_cpu_crypt */ +#define DM_SUBMIT_FROM_CRYPT_CPUS_SUPPORTED (1 << 8) /* submit_from_crypt_cpus */ +#define DM_VERITY_ON_CORRUPTION_SUPPORTED (1 << 9) /* ignore/restart_on_corruption, ignore_zero_block */ +#define DM_VERITY_FEC_SUPPORTED (1 << 10) /* Forward Error Correction (FEC) */ +#define DM_KERNEL_KEYRING_SUPPORTED (1 << 11) /* dm-crypt allows loading kernel keyring keys */ +#define DM_INTEGRITY_SUPPORTED (1 << 12) /* dm-integrity target supported */ +#define DM_SECTOR_SIZE_SUPPORTED (1 << 13) /* support for sector size setting in dm-crypt/dm-integrity */ +#define DM_CAPI_STRING_SUPPORTED (1 << 14) /* support for cryptoapi format cipher definition */ +#define DM_DEFERRED_SUPPORTED (1 << 15) /* deferred removal of device */ +#define DM_INTEGRITY_RECALC_SUPPORTED (1 << 16) /* dm-integrity automatic recalculation supported */ + +typedef enum { DM_CRYPT = 0, DM_VERITY, DM_INTEGRITY, DM_LINEAR, DM_UNKNOWN } dm_target_type; +enum tdirection { TARGET_SET = 1, TARGET_QUERY }; + +int dm_flags(struct crypt_device *cd, dm_target_type target, uint32_t *flags); + +#define DM_ACTIVE_DEVICE (1 << 0) +#define DM_ACTIVE_UUID (1 << 1) +#define DM_ACTIVE_HOLDERS (1 << 2) + +#define DM_ACTIVE_CRYPT_CIPHER (1 << 3) +#define DM_ACTIVE_CRYPT_KEYSIZE (1 << 4) +#define DM_ACTIVE_CRYPT_KEY (1 << 5) + +#define DM_ACTIVE_VERITY_ROOT_HASH (1 << 6) +#define DM_ACTIVE_VERITY_HASH_DEVICE (1 << 7) +#define DM_ACTIVE_VERITY_PARAMS (1 << 8) + +#define DM_ACTIVE_INTEGRITY_PARAMS (1 << 9) + +struct dm_target { + dm_target_type type; + enum tdirection direction; + uint64_t offset; + uint64_t size; + struct device *data_device; + union { + struct { + const char *cipher; + const char *integrity; + + /* Active key for device */ + struct volume_key *vk; + + /* struct crypt_active_device */ + uint64_t offset; /* offset in sectors */ + uint64_t iv_offset; /* IV initialisation sector */ + uint32_t tag_size; /* additional on-disk tag size */ + uint32_t sector_size; /* encryption sector size */ + } crypt; + struct { + struct device *hash_device; + struct device *fec_device; + + const char *root_hash; + uint32_t root_hash_size; + + uint64_t hash_offset; /* hash offset in blocks (not header) */ + uint64_t hash_blocks; /* size of hash device (in hash blocks) */ + uint64_t fec_offset; /* FEC offset in blocks (not header) */ + uint64_t fec_blocks; /* size of FEC device (in hash blocks) */ + struct crypt_params_verity *vp; + } verity; + struct { + uint64_t journal_size; + uint32_t journal_watermark; + uint32_t journal_commit_time; + uint32_t interleave_sectors; + uint32_t tag_size; + uint64_t offset; /* offset in sectors */ + uint32_t sector_size; /* integrity sector size */ + uint32_t buffer_sectors; + + const char *integrity; + /* Active key for device */ + struct volume_key *vk; + + const char *journal_integrity; + struct volume_key *journal_integrity_key; + + const char *journal_crypt; + struct volume_key *journal_crypt_key; + + struct device *meta_device; + } integrity; + struct { + uint64_t offset; + } linear; + } u; + + char *params; + struct dm_target *next; +}; + +struct crypt_dm_active_device { + uint64_t size; /* active device size */ + uint32_t flags; /* activation flags */ + const char *uuid; + + unsigned holders:1; /* device holders detected (on query only) */ + + struct dm_target segment; +}; + +static inline bool single_segment(const struct crypt_dm_active_device *dmd) +{ + return dmd && !dmd->segment.next; +} + +void dm_backend_init(struct crypt_device *cd); +void dm_backend_exit(struct crypt_device *cd); + +int dm_targets_allocate(struct dm_target *first, unsigned count); +void dm_targets_free(struct crypt_device *cd, struct crypt_dm_active_device *dmd); + +int dm_crypt_target_set(struct dm_target *tgt, size_t seg_offset, size_t seg_size, + struct device *data_device, struct volume_key *vk, const char *cipher, + size_t iv_offset, size_t data_offset, const char *integrity, + uint32_t tag_size, uint32_t sector_size); +int dm_verity_target_set(struct dm_target *tgt, size_t seg_offset, size_t seg_size, + struct device *data_device, struct device *hash_device, struct device *fec_device, + const char *root_hash, uint32_t root_hash_size, uint64_t hash_offset_block, + uint64_t hash_blocks, struct crypt_params_verity *vp); +int dm_integrity_target_set(struct dm_target *tgt, size_t seg_offset, size_t seg_size, + struct device *meta_device, + struct device *data_device, uint64_t tag_size, uint64_t offset, uint32_t sector_size, + struct volume_key *vk, + struct volume_key *journal_crypt_key, struct volume_key *journal_mac_key, + const struct crypt_params_integrity *ip); +int dm_linear_target_set(struct dm_target *tgt, size_t seg_offset, size_t seg_size, + struct device *data_device, size_t data_offset); + +int dm_remove_device(struct crypt_device *cd, const char *name, uint32_t flags); +int dm_status_device(struct crypt_device *cd, const char *name); +int dm_status_suspended(struct crypt_device *cd, const char *name); +int dm_status_verity_ok(struct crypt_device *cd, const char *name); +int dm_status_integrity_failures(struct crypt_device *cd, const char *name, uint64_t *count); +int dm_query_device(struct crypt_device *cd, const char *name, + uint32_t get_flags, struct crypt_dm_active_device *dmd); +int dm_create_device(struct crypt_device *cd, const char *name, + const char *type, struct crypt_dm_active_device *dmd); +int dm_reload_device(struct crypt_device *cd, const char *name, + struct crypt_dm_active_device *dmd, unsigned resume); +int dm_suspend_device(struct crypt_device *cd, const char *name); +int dm_suspend_and_wipe_key(struct crypt_device *cd, const char *name); +int dm_resume_device(struct crypt_device *cd, const char *name, uint32_t flags); +int dm_resume_and_reinstate_key(struct crypt_device *cd, const char *name, + const struct volume_key *vk); +int dm_error_device(struct crypt_device *cd, const char *name); +int dm_clear_device(struct crypt_device *cd, const char *name); + +const char *dm_get_dir(void); + +int lookup_dm_dev_by_uuid(struct crypt_device *cd, const char *uuid, const char *type); + +/* These are DM helpers used only by utils_devpath file */ +int dm_is_dm_device(int major, int minor); +int dm_is_dm_kernel_name(const char *name); +char *dm_device_path(const char *prefix, int major, int minor); + +#endif /* _UTILS_DM_H */ |