| /* |
| * 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 "netlinkmessage.h" |
| |
| #include "log.h" |
| |
| #include <linux/netlink.h> |
| #include <linux/rtnetlink.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include <netlink/msg.h> |
| |
| size_t getSpaceForMessageType(uint16_t type) { |
| switch (type) { |
| case RTM_NEWLINK: |
| case RTM_GETLINK: |
| return NLMSG_SPACE(sizeof(ifinfomsg)); |
| default: |
| return 0; |
| } |
| } |
| |
| NetlinkMessage::NetlinkMessage(uint16_t type, |
| uint32_t sequence) |
| : mData(getSpaceForMessageType(type), 0) { |
| |
| auto header = reinterpret_cast<nlmsghdr*>(mData.data()); |
| header->nlmsg_len = mData.size(); |
| header->nlmsg_flags = NLM_F_REQUEST; |
| header->nlmsg_type = type; |
| header->nlmsg_seq = sequence; |
| header->nlmsg_pid = getpid(); |
| } |
| |
| NetlinkMessage::NetlinkMessage(const char* data, size_t size) |
| : mData(data, data + size) { |
| } |
| |
| bool NetlinkMessage::getAttribute(int attributeId, void* data, size_t size) const { |
| const void* value = nullptr; |
| const auto attr = nlmsg_find_attr((struct nlmsghdr*)mData.data(), sizeof(ifinfomsg), attributeId); |
| if (!attr) { |
| return false; |
| } |
| value = (const uint8_t*) attr + NLA_HDRLEN; |
| size = attr->nla_len; |
| memcpy(data, value, size); |
| return true; |
| } |
| |
| uint16_t NetlinkMessage::type() const { |
| auto header = reinterpret_cast<const nlmsghdr*>(mData.data()); |
| return header->nlmsg_type; |
| } |
| |
| uint32_t NetlinkMessage::sequence() const { |
| auto header = reinterpret_cast<const nlmsghdr*>(mData.data()); |
| return header->nlmsg_seq; |
| } |