/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "libdm/dm_target.h"
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#include <android-base/logging.h>
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#include <android-base/macros.h>
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#include <android-base/strings.h>
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#include <libdm/dm.h>
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namespace android {
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namespace dm {
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std::string DmTarget::Serialize() const {
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// Create a string containing a dm_target_spec, parameter data, and an
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// explicit null terminator.
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std::string data(sizeof(dm_target_spec), '\0');
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data += GetParameterString();
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data.push_back('\0');
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// The kernel expects each target to be 8-byte aligned.
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size_t padding = DM_ALIGN(data.size()) - data.size();
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for (size_t i = 0; i < padding; i++) {
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data.push_back('\0');
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}
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// Finally fill in the dm_target_spec.
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struct dm_target_spec* spec = reinterpret_cast<struct dm_target_spec*>(&data[0]);
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spec->sector_start = start();
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spec->length = size();
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snprintf(spec->target_type, sizeof(spec->target_type), "%s", name().c_str());
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spec->next = (uint32_t)data.size();
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return data;
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}
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std::string DmTargetZero::GetParameterString() const {
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// The zero target type has no additional parameters.
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return "";
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}
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std::string DmTargetLinear::GetParameterString() const {
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return block_device_ + " " + std::to_string(physical_sector_);
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}
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DmTargetVerity::DmTargetVerity(uint64_t start, uint64_t length, uint32_t version,
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const std::string& block_device, const std::string& hash_device,
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uint32_t data_block_size, uint32_t hash_block_size,
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uint32_t num_data_blocks, uint32_t hash_start_block,
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const std::string& hash_algorithm, const std::string& root_digest,
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const std::string& salt)
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: DmTarget(start, length), valid_(true) {
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base_args_ = {
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std::to_string(version),
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block_device,
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hash_device,
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std::to_string(data_block_size),
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std::to_string(hash_block_size),
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std::to_string(num_data_blocks),
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std::to_string(hash_start_block),
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hash_algorithm,
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root_digest,
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salt,
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};
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}
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void DmTargetVerity::UseFec(const std::string& device, uint32_t num_roots, uint32_t num_blocks,
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uint32_t start) {
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optional_args_.emplace_back("use_fec_from_device");
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optional_args_.emplace_back(device);
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optional_args_.emplace_back("fec_roots");
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optional_args_.emplace_back(std::to_string(num_roots));
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optional_args_.emplace_back("fec_blocks");
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optional_args_.emplace_back(std::to_string(num_blocks));
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optional_args_.emplace_back("fec_start");
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optional_args_.emplace_back(std::to_string(start));
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}
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void DmTargetVerity::SetVerityMode(const std::string& mode) {
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if (mode != "restart_on_corruption" && mode != "ignore_corruption") {
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LOG(ERROR) << "Unknown verity mode: " << mode;
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valid_ = false;
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return;
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}
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optional_args_.emplace_back(mode);
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}
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void DmTargetVerity::IgnoreZeroBlocks() {
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optional_args_.emplace_back("ignore_zero_blocks");
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}
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std::string DmTargetVerity::GetParameterString() const {
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std::string base = android::base::Join(base_args_, " ");
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if (optional_args_.empty()) {
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return base;
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}
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std::string optional = android::base::Join(optional_args_, " ");
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return base + " " + std::to_string(optional_args_.size()) + " " + optional;
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}
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std::string DmTargetAndroidVerity::GetParameterString() const {
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return keyid_ + " " + block_device_;
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}
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} // namespace dm
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} // namespace android
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