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/*
* Copyright (C) 2017 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 "common/libs/net/netlink_request.h"
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <net/if.h>
#include <string.h>
#include <algorithm>
#include <string>
#include <vector>
#include "common/libs/glog/logging.h"
namespace cvd {
namespace {
uint32_t kRequestSequenceNumber = 0;
} // namespace
uint32_t NetlinkRequest::SeqNo() const {
return header_->nlmsg_seq;
}
void* NetlinkRequest::AppendRaw(const void* data, size_t length) {
auto* output = static_cast<char*>(ReserveRaw(length));
const auto* input = static_cast<const char*>(data);
std::copy(input, input + length, output);
return output;
}
void* NetlinkRequest::ReserveRaw(size_t length) {
size_t original_size = request_.size();
request_.resize(original_size + RTA_ALIGN(length), '\0');
return reinterpret_cast<void*>(request_.data() + original_size);
}
nlattr* NetlinkRequest::AppendTag(
uint16_t type, const void* data, uint16_t data_length) {
nlattr* attr = Reserve<nlattr>();
attr->nla_type = type;
attr->nla_len = RTA_LENGTH(data_length);
AppendRaw(data, data_length);
return attr;
}
NetlinkRequest::NetlinkRequest(int32_t command, int32_t flags) {
request_.reserve(512);
header_ = Reserve<nlmsghdr>();
flags |= NLM_F_ACK | NLM_F_REQUEST;
header_->nlmsg_flags = flags;
header_->nlmsg_type = command;
header_->nlmsg_pid = getpid();
header_->nlmsg_seq = kRequestSequenceNumber++;
}
NetlinkRequest::NetlinkRequest(NetlinkRequest&& other) {
using std::swap;
swap(lists_, other.lists_);
swap(header_, other.header_);
swap(request_, other.request_);
}
void NetlinkRequest::AddString(uint16_t type, const std::string& value) {
AppendTag(type, value.c_str(), value.length() + 1);
}
void NetlinkRequest::AddIfInfo(int32_t if_index, bool operational) {
ifinfomsg* if_info = Reserve<ifinfomsg>();
if_info->ifi_family = AF_UNSPEC;
if_info->ifi_index = if_index;
if_info->ifi_flags = operational ? IFF_UP : 0;
if_info->ifi_change = IFF_UP;
}
void NetlinkRequest::AddAddrInfo(int32_t if_index, int prefix_len) {
ifaddrmsg* ad_info = Reserve<ifaddrmsg>();
ad_info->ifa_family = AF_INET;
ad_info->ifa_prefixlen = prefix_len;
ad_info->ifa_flags = IFA_F_PERMANENT | IFA_F_SECONDARY;
ad_info->ifa_scope = 0;
ad_info->ifa_index = if_index;
}
void NetlinkRequest::PushList(uint16_t type) {
int length = request_.size();
nlattr* list = AppendTag(type, NULL, 0);
lists_.push_back(std::make_pair(list, length));
}
void NetlinkRequest::PopList() {
if (lists_.empty()) {
LOG(ERROR) << "List pop with no lists left on stack.";
return;
}
std::pair<nlattr*, int> list = lists_.back();
lists_.pop_back();
list.first->nla_len = request_.size() - list.second;
}
void* NetlinkRequest::RequestData() const {
// Update request length before reporting raw data.
header_->nlmsg_len = request_.size();
return header_;
}
size_t NetlinkRequest::RequestLength() const {
return request_.size();
}
} // namespace cvd
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