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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <libnl++/generic/FamilyTracker.h>
#include <android-base/logging.h>
namespace android::nl::generic {
bool FamilyTracker::track(const Buffer<nlmsghdr>& buffer) {
const auto msgMaybe = nl::Message<genlmsghdr>::parse(buffer, {GENL_ID_CTRL});
if (!msgMaybe.has_value()) return false;
const auto msg = *msgMaybe;
if (msg->cmd != CTRL_CMD_NEWFAMILY) return true;
const auto familyName = msg.attributes.get<std::string>(CTRL_ATTR_FAMILY_NAME);
const auto familyId = msg.attributes.get<uint16_t>(CTRL_ATTR_FAMILY_ID);
if (familyId < GENL_START_ALLOC) {
LOG(WARNING) << "Invalid family ID: " << familyId;
return true;
}
if (familyName == "nl80211") mNl80211FamilyId = familyId;
return true;
}
std::optional<Message<genlmsghdr>> FamilyTracker::parseNl80211(Buffer<nlmsghdr> msg) {
if (track(msg)) return std::nullopt;
if (!mNl80211FamilyId.has_value()) return std::nullopt;
return nl::Message<genlmsghdr>::parse(msg, {*mNl80211FamilyId});
}
} // namespace android::nl::generic
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