/* * libdevmapper - device-mapper backend for cryptsetup * * Copyright (C) 2004 Jana Saout * Copyright (C) 2004-2007 Clemens Fruhwirth * Copyright (C) 2009-2021 Red Hat, Inc. All rights reserved. * Copyright (C) 2009-2021 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 #include struct crypt_device; struct volume_key; struct crypt_params_verity; struct device; struct crypt_params_integrity; /* Device mapper internal flags */ #define DM_RESUME_PRIVATE (1 << 4) /* CRYPT_ACTIVATE_PRIVATE */ #define DM_SUSPEND_SKIP_LOCKFS (1 << 5) #define DM_SUSPEND_WIPE_KEY (1 << 6) #define DM_SUSPEND_NOFLUSH (1 << 7) static inline uint32_t act2dmflags(uint32_t act_flags) { return (act_flags & DM_RESUME_PRIVATE); } /* 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 */ #define DM_INTEGRITY_BITMAP_SUPPORTED (1 << 17) /* dm-integrity bitmap mode supported */ #define DM_GET_TARGET_VERSION_SUPPORTED (1 << 18) /* dm DM_GET_TARGET version ioctl supported */ #define DM_INTEGRITY_FIX_PADDING_SUPPORTED (1 << 19) /* supports the parameter fix_padding that fixes a bug that caused excessive padding */ #define DM_BITLK_EBOIV_SUPPORTED (1 << 20) /* EBOIV for BITLK supported */ #define DM_BITLK_ELEPHANT_SUPPORTED (1 << 21) /* Elephant diffuser for BITLK supported */ #define DM_VERITY_SIGNATURE_SUPPORTED (1 << 22) /* Verity option root_hash_sig_key_desc supported */ #define DM_INTEGRITY_DISCARDS_SUPPORTED (1 << 23) /* dm-integrity discards/TRIM option is supported */ #define DM_VERITY_PANIC_CORRUPTION_SUPPORTED (1 << 24) /* dm-verity panic on corruption */ #define DM_CRYPT_NO_WORKQUEUE_SUPPORTED (1 << 25) /* dm-crypt suppot for bypassing workqueues */ #define DM_INTEGRITY_FIX_HMAC_SUPPORTED (1 << 26) /* hmac covers also superblock */ typedef enum { DM_CRYPT = 0, DM_VERITY, DM_INTEGRITY, DM_LINEAR, DM_ERROR, DM_ZERO, 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; const char *root_hash_sig_key_desc; uint64_t hash_offset; /* hash offset in blocks (not header) */ uint64_t fec_offset; /* FEC offset in blocks (not header) */ uint64_t fec_blocks; /* FEC blocks covering data + hash + padding (foreign metadata)*/ 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; bool fix_padding; bool fix_hmac; bool legacy_recalc; } integrity; struct { uint64_t offset; } linear; struct { } zero; } 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, uint64_t seg_offset, uint64_t seg_size, struct device *data_device, struct volume_key *vk, const char *cipher, uint64_t iv_offset, uint64_t data_offset, const char *integrity, uint32_t tag_size, uint32_t sector_size); int dm_verity_target_set(struct dm_target *tgt, uint64_t seg_offset, uint64_t seg_size, struct device *data_device, struct device *hash_device, struct device *fec_device, const char *root_hash, uint32_t root_hash_size, const char* root_hash_sig_key_desc, uint64_t hash_offset_block, uint64_t fec_blocks, struct crypt_params_verity *vp); int dm_integrity_target_set(struct crypt_device *cd, struct dm_target *tgt, uint64_t seg_offset, uint64_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, uint64_t seg_offset, uint64_t seg_size, struct device *data_device, uint64_t data_offset); int dm_zero_target_set(struct dm_target *tgt, uint64_t seg_offset, uint64_t seg_size); 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_device_deps(struct crypt_device *cd, const char *name, const char *prefix, char **names, size_t names_length); 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, uint32_t dmflags, unsigned resume); int dm_suspend_device(struct crypt_device *cd, const char *name, uint32_t dmflags); int dm_resume_device(struct crypt_device *cd, const char *name, uint32_t dmflags); 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 dm_is_dm_kernel_name(const char *name); char *dm_device_path(const char *prefix, int major, int minor); char *dm_device_name(const char *path); #endif /* _UTILS_DM_H */