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/*
* 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
/*
* 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;
#endif /* DM_ANDROID_VERITY_H */
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