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/*
* Copyright (C) 2019 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++/MessageFactory.h>
#include <android-base/logging.h>
#include <libnl++/bits.h>
namespace android::nl {
static nlattr* tail(nlmsghdr* msg) {
return reinterpret_cast<nlattr*>(uintptr_t(msg) + impl::align(msg->nlmsg_len));
}
nlattr* MessageFactoryBase::add(nlmsghdr* msg, size_t maxLen, nlattrtype_t type, const void* data,
size_t dataLen) {
const auto totalAttrLen = impl::space<nlattr>(dataLen);
const auto newLen = impl::align(msg->nlmsg_len) + totalAttrLen;
if (newLen > maxLen) {
LOG(ERROR) << "Can't add attribute of size " << dataLen //
<< " - exceeded maxLen: " << newLen << " > " << maxLen;
return nullptr;
}
auto attr = tail(msg);
attr->nla_len = totalAttrLen;
attr->nla_type = type;
if (dataLen > 0) memcpy(impl::data<nlattr, void>(attr), data, dataLen);
msg->nlmsg_len = newLen;
return attr;
}
void MessageFactoryBase::closeNested(nlmsghdr* msg, nlattr* nested) {
if (nested == nullptr) return;
nested->nla_len = uintptr_t(tail(msg)) - uintptr_t(nested);
}
} // namespace android::nl
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