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https://github.com/Atmosphere-NX/Atmosphere.git
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81f91803ec
* fs: implement support for interacting with ncas. * spl: extend to use virtual keyslots
134 lines
5.4 KiB
C++
134 lines
5.4 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stratosphere.hpp>
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namespace ams::fssystem {
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class KeySlotCacheAccessor : public ::ams::fs::impl::Newable {
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NON_COPYABLE(KeySlotCacheAccessor);
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NON_MOVEABLE(KeySlotCacheAccessor);
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private:
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std::unique_lock<os::Mutex> lk;
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const s32 slot_index;
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public:
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KeySlotCacheAccessor(s32 idx, std::unique_lock<os::Mutex> &&l) : lk(std::move(l)), slot_index(idx) { /* ... */ }
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s32 GetKeySlotIndex() const { return this->slot_index; }
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};
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class KeySlotCacheEntry : public util::IntrusiveListBaseNode<KeySlotCacheEntry> {
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NON_COPYABLE(KeySlotCacheEntry);
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NON_MOVEABLE(KeySlotCacheEntry);
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public:
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static constexpr size_t KeySize = crypto::AesDecryptor128::KeySize;
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private:
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const s32 slot_index;
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u8 key1[KeySize];
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s32 key2;
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public:
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explicit KeySlotCacheEntry(s32 idx) : slot_index(idx), key2(-1) {
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std::memset(this->key1, 0, sizeof(this->key1));
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}
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bool Contains(const void *key, size_t key_size, s32 key2) const {
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AMS_ASSERT(key_size == KeySize);
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return key2 == this->key2 && std::memcmp(this->key1, key, KeySize) == 0;
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}
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s32 GetKeySlotIndex() const { return this->slot_index; }
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void SetKey(const void *key, size_t key_size, s32 key2) {
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AMS_ASSERT(key_size == KeySize);
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std::memcpy(this->key1, key, key_size);
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this->key2 = key2;
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}
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};
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class KeySlotCache {
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NON_COPYABLE(KeySlotCache);
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NON_MOVEABLE(KeySlotCache);
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private:
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using KeySlotCacheEntryList = util::IntrusiveListBaseTraits<KeySlotCacheEntry>::ListType;
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private:
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os::Mutex mutex;
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KeySlotCacheEntryList high_priority_mru_list;
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KeySlotCacheEntryList low_priority_mru_list;
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public:
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constexpr KeySlotCache() : mutex(false), high_priority_mru_list(), low_priority_mru_list() { /* ... */ }
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Result AllocateHighPriority(std::unique_ptr<KeySlotCacheAccessor> *out, const void *key, size_t key_size, s32 key2) {
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return this->AllocateFromLru(out, this->high_priority_mru_list, key, key_size, key2);
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}
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Result AllocateLowPriority(std::unique_ptr<KeySlotCacheAccessor> *out, const void *key, size_t key_size, s32 key2) {
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return this->AllocateFromLru(out, this->high_priority_mru_list, key, key_size, key2);
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}
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Result Find(std::unique_ptr<KeySlotCacheAccessor> *out, const void *key, size_t key_size, s32 key2) {
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std::unique_lock lk(this->mutex);
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KeySlotCacheEntryList *lists[2] = { std::addressof(this->high_priority_mru_list), std::addressof(this->low_priority_mru_list) };
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for (auto list : lists) {
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for (auto it = list->begin(); it != list->end(); ++it) {
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if (it->Contains(key, key_size, key2)) {
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std::unique_ptr accessor = std::make_unique<KeySlotCacheAccessor>(it->GetKeySlotIndex(), std::move(lk));
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R_UNLESS(accessor != nullptr, fs::ResultAllocationFailure());
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*out = std::move(accessor);
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this->UpdateMru(list, it);
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return ResultSuccess();
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}
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}
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}
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return fs::ResultTargetNotFound();
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}
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void AddEntry(KeySlotCacheEntry *entry) {
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std::unique_lock lk(this->mutex);
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this->low_priority_mru_list.push_front(*entry);
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}
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private:
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Result AllocateFromLru(std::unique_ptr<KeySlotCacheAccessor> *out, KeySlotCacheEntryList &dst_list, const void *key, size_t key_size, s32 key2) {
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std::unique_lock lk(this->mutex);
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KeySlotCacheEntryList &src_list = this->low_priority_mru_list.empty() ? this->high_priority_mru_list : this->low_priority_mru_list;
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AMS_ASSERT(!src_list.empty());
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auto it = src_list.rbegin();
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std::unique_ptr accessor = std::make_unique<KeySlotCacheAccessor>(it->GetKeySlotIndex(), std::move(lk));
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*out = std::move(accessor);
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it->SetKey(key, key_size, key2);
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auto *entry = std::addressof(*it);
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src_list.pop_back();
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dst_list.push_front(*entry);
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return ResultSuccess();
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}
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void UpdateMru(KeySlotCacheEntryList *list, KeySlotCacheEntryList::iterator it) {
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auto *entry = std::addressof(*it);
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list->erase(it);
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list->push_front(*entry);
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}
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};
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}
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