1/*
2 * Copyright (C) 2021-2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#ifndef INCLUDE_NETLINK_SOCKET_H
17#define INCLUDE_NETLINK_SOCKET_H
18
19#include <functional>
20#include <linux/netlink.h>
21#include <linux/rtnetlink.h>
22#include <memory>
23#include <netinet/in.h>
24#include <sys/epoll.h>
25
26namespace OHOS {
27namespace nmd {
28constexpr uint32_t NETLINKMESSAGE_MAX_LEN = 1024;
29constexpr uint32_t KERNEL_BUFFER_SIZE = 8192;
30constexpr uint32_t LOCAL_PRIORITY = 32767;
31/**
32 * Send netklink message to kernel
33 *
34 * @param msg nlmsghdr struct
35 * @param table If clear route，this is table number, otherwise it will is 0
36 * @return Returns 0, send netklink message to kernel successfully, otherwise it will fail
37 */
38int32_t SendNetlinkMsgToKernel(nlmsghdr *msg, uint32_t table = 0);
39
40/**
41 * Clear route or rule configure
42 *
43 * @param clearThing Decide to clear route or rule. Must be one of RTM_GETRULE/RTM_GETROUTE
44 * @param table If clear route，this is table number, otherwise it will is 0
45 * @return Returns 0, clear route or rule configure successfully, otherwise it will fail
46 */
47int32_t ClearRouteInfo(uint16_t clearThing, uint32_t table);
48
49/**
50 * Get info from kernel
51 *
52 * @param sock Sock for read
53 * @param clearThing Type for kernel nlmsg_type
54 * @param table Route property for RTA_TABLE
55 * @return Returns 0, get info from kernel successfully, otherwise it will fail
56 */
57int32_t GetInfoFromKernel(int32_t sock, uint16_t clearThing, uint32_t table);
58
59/**
60 * Deal info from kernel
61 *
62 * @param nlmsgHeader nlmsghdr
63 * @param clearThing Type for kernel nlmsg_type
64 * @param table Route property for RTA_TABLE
65 * @return Returns 0, deal info from kernel successfully, otherwise it will fail
66 */
67void DealInfoFromKernel(nlmsghdr *nlmsgHeader, uint16_t clearThing, uint32_t table);
68
69/**
70 * Get route property
71 *
72 * @param nlmsgHeader nlmsghdr
73 * @param property Property for route
74 * @return Returns 0, get route property successfully, otherwise it will fail
75 */
76int32_t GetRouteProperty(const nlmsghdr *nlmsgHeader, int32_t property);
77} // namespace nmd
78} // namespace OHOS
79#endif // !INCLUDE_NETLINK_SOCKET_H
80