| /* |
| * Copyright (C) 2015 Google, Inc. |
| * |
| * This software is licensed under the terms of the GNU General Public |
| * License version 2, as published by the Free Software Foundation, and |
| * may be copied, distributed, and modified under those terms. |
| * |
| * 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. |
| * |
| */ |
| |
| #ifndef DM_ANDROID_VERITY_H |
| #define DM_ANDROID_VERITY_H |
| |
| #include <crypto/sha.h> |
| |
| #define RSANUMBYTES 256 |
| #define VERITY_METADATA_MAGIC_NUMBER 0xb001b001 |
| #define VERITY_METADATA_MAGIC_DISABLE 0x46464f56 |
| #define VERITY_METADATA_VERSION 0 |
| #define VERITY_STATE_DISABLE 1 |
| #define DATA_BLOCK_SIZE (4 * 1024) |
| #define VERITY_METADATA_SIZE (8 * DATA_BLOCK_SIZE) |
| #define VERITY_TABLE_ARGS 10 |
| #define VERITY_COMMANDLINE_PARAM_LENGTH 20 |
| |
| #define FEC_MAGIC 0xFECFECFE |
| #define FEC_BLOCK_SIZE (4 * 1024) |
| #define FEC_VERSION 0 |
| #define FEC_RSM 255 |
| #define FEC_ARG_LENGTH 300 |
| |
| #define VERITY_TABLE_OPT_RESTART "restart_on_corruption" |
| #define VERITY_TABLE_OPT_LOGGING "ignore_corruption" |
| #define VERITY_TABLE_OPT_IGNZERO "ignore_zero_blocks" |
| |
| #define VERITY_TABLE_OPT_FEC_FORMAT \ |
| "use_fec_from_device %s fec_start %llu fec_blocks %llu fec_roots %u ignore_zero_blocks" |
| #define VERITY_TABLE_OPT_FEC_ARGS 9 |
| |
| #define VERITY_DEBUG 0 |
| |
| #define DM_MSG_PREFIX "android-verity" |
| |
| #define DM_LINEAR_ARGS 2 |
| #define DM_LINEAR_TARGET_OFFSET "0" |
| |
| /* |
| * There can be two formats. |
| * if fec is present |
| * <data_blocks> <verity_tree> <verity_metdata_32K><fec_data><fec_data_4K> |
| * if fec is not present |
| * <data_blocks> <verity_tree> <verity_metdata_32K> |
| */ |
| /* TODO: rearrange structure to reduce memory holes |
| * depends on userspace change. |
| */ |
| struct fec_header { |
| __le32 magic; |
| __le32 version; |
| __le32 size; |
| __le32 roots; |
| __le32 fec_size; |
| __le64 inp_size; |
| u8 hash[SHA256_DIGEST_SIZE]; |
| }; |
| |
| struct android_metadata_header { |
| __le32 magic_number; |
| __le32 protocol_version; |
| char signature[RSANUMBYTES]; |
| __le32 table_length; |
| }; |
| |
| struct android_metadata { |
| struct android_metadata_header *header; |
| char *verity_table; |
| }; |
| |
| struct fec_ecc_metadata { |
| bool valid; |
| u32 roots; |
| u64 blocks; |
| u64 rounds; |
| u64 start; |
| }; |
| |
| struct bio_read { |
| struct page **page_io; |
| int number_of_pages; |
| }; |
| |
| extern struct target_type linear_target; |
| |
| extern void dm_linear_dtr(struct dm_target *ti); |
| extern int dm_linear_map(struct dm_target *ti, struct bio *bio); |
| extern void dm_linear_status(struct dm_target *ti, status_type_t type, |
| unsigned status_flags, char *result, unsigned maxlen); |
| extern int dm_linear_ioctl(struct dm_target *ti, unsigned int cmd, |
| unsigned long arg); |
| extern int dm_linear_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
| struct bio_vec *biovec, int max_size); |
| extern int dm_linear_iterate_devices(struct dm_target *ti, |
| iterate_devices_callout_fn fn, void *data); |
| extern int dm_linear_ctr(struct dm_target *ti, unsigned int argc, char **argv); |
| #endif /* DM_ANDROID_VERITY_H */ |