/*
 * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
 * 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 <arpa/inet.h>
#include <cstdint>
#include <cstring>
#include <iostream>
#include <linux/fib_rules.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <map>
#include <mutex>
#include <net/if.h>
#include <netlink_socket.h>
#include <sstream>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <unistd.h>

#include "fwmark.h"
#include "net_manager_constants.h"
#include "netlink_manager.h"
#include "netlink_msg.h"
#include "netmanager_base_common_utils.h"
#include "netnative_log_wrapper.h"
#include "securec.h"

#include "route_manager.h"

using namespace OHOS::NetManagerStandard;
using namespace OHOS::NetManagerStandard::CommonUtils;
namespace OHOS {
namespace nmd {
namespace {
constexpr int32_t RULE_LEVEL_CLAT_TUN = 8000;
constexpr int32_t RULE_LEVEL_VPN_OUTPUT_TO_LOCAL = 9000;
constexpr int32_t RULE_LEVEL_SECURE_VPN = 10000;
constexpr int32_t RULE_LEVEL_VNIC_NETWORK = 10500;
constexpr int32_t RULE_LEVEL_EXPLICIT_NETWORK = 11000;
constexpr int32_t RULE_LEVEL_OUTPUT_IFACE_VPN = 11500;
constexpr int32_t RULE_LEVEL_OUTPUT_INTERFACE = 12000;
constexpr int32_t RULE_LEVEL_LOCAL_NETWORK = 13000;
constexpr int32_t RULE_LEVEL_SHARING = 14000;
constexpr int32_t RULE_LEVEL_DEFAULT = 16000;
constexpr uint32_t ROUTE_VNIC_TABLE = 97;
constexpr uint32_t ROUTE_VPN_NETWORK_TABLE = 98;
constexpr uint32_t ROUTE_LOCAL_NETWORK_TABLE = 99;
constexpr uint32_t ROUTE_INTERNAL_DEFAULT_TABLE = 1;
constexpr uint32_t OUTPUT_MAX = 128;
constexpr uint32_t BIT_32_LEN = 32;
constexpr uint32_t BIT_MAX_LEN = 255;
constexpr uint32_t DECIMAL_DIGITAL = 10;
constexpr uint32_t BYTE_ALIGNMENT = 8;
constexpr uint32_t THOUSAND_LEN = 100;
constexpr uint16_t LOCAL_NET_ID = 99;
constexpr uint16_t NETID_UNSET = 0;
constexpr uint32_t MARK_UNSET = 0;
constexpr uid_t UID_ROOT = 0;
constexpr std::pair<uid_t, uid_t> UID_ALLOW_INTERNAL = {7023, 7023};
constexpr uint32_t ROUTEMANAGER_SUCCESS = 0;
constexpr uint32_t ROUTEMANAGER_ERROR = -1;
constexpr bool ADD_CONTROL = true;
constexpr bool DEL_CONTROL = false;
const std::string RULEIIF_LOOPBACK = "lo";
const std::string RULEIIF_NULL = "";
const std::string RULEOIF_NULL = "";
const std::string LOCAL_MANGLE_INPUT = "routectrl_mangle_INPUT";
constexpr const char *NETSYS_ROUTE_INIT_DIR_PATH = "/data/service/el1/public/netmanager/route";

struct FibRuleUidRange {
    __u32 start;
    __u32 end;
};
} // namespace

std::mutex RouteManager::interfaceToTableLock_;
std::map<std::string, uint32_t> RouteManager::interfaceToTable_;

RouteManager::RouteManager()
{
    Init();
}

int32_t RouteManager::UpdateVnicRoute(const std::string &interfaceName, const std::string &destinationName,
                                      const std::string &nextHop, bool add)
{
    NETNATIVE_LOGI(
        "VnicChangeRoute,interfaceName:%{public}s,destination:%{public}s, nextHop:%{public}s, add:%{public}d ",
        interfaceName.c_str(), ToAnonymousIp(destinationName).c_str(), ToAnonymousIp(nextHop).c_str(), add);

    RouteInfo routeInfo;
    routeInfo.routeTable = ROUTE_VNIC_TABLE;
    routeInfo.routeInterfaceName = interfaceName;
    routeInfo.routeDestinationName = destinationName;
    routeInfo.routeNextHop = nextHop;
    uint16_t flags = add ? (NLM_F_CREATE | NLM_F_EXCL) : NLM_F_EXCL;
    uint16_t action = add ? RTM_NEWROUTE : RTM_DELROUTE;

    return UpdateRouteRule(action, flags, routeInfo);
}

int32_t RouteManager::AddRoute(TableType tableType, const std::string &interfaceName,
                               const std::string &destinationName, const std::string &nextHop)
{
    NETNATIVE_LOGI("AddRoute,interfaceName:%{public}s,destination:%{public}s, nextHop:%{public}s",
                   interfaceName.c_str(), ToAnonymousIp(destinationName).c_str(), ToAnonymousIp(nextHop).c_str());

    // This is a user-defined structure used to integrate the information required for setting up routes.
    RouteInfo routeInfo;
    if (SetRouteInfo(tableType, interfaceName, destinationName, nextHop, routeInfo) != 0) {
        return -1;
    }

    return UpdateRouteRule(RTM_NEWROUTE, NLM_F_CREATE | NLM_F_EXCL, routeInfo);
}

int32_t RouteManager::RemoveRoute(TableType tableType, const std::string &interfaceName,
                                  const std::string &destinationName, const std::string &nextHop)
{
    NETNATIVE_LOGI("RemoveRoute,interfaceName:%{public}s,destination:%{public}s,nextHop:%{public}s",
                   interfaceName.c_str(), ToAnonymousIp(destinationName).c_str(), ToAnonymousIp(nextHop).c_str());

    RouteInfo routeInfo;
    if (SetRouteInfo(tableType, interfaceName, destinationName, nextHop, routeInfo) != 0) {
        return -1;
    }
    return UpdateRouteRule(RTM_DELROUTE, NLM_F_EXCL, routeInfo);
}

int32_t RouteManager::UpdateRoute(TableType tableType, const std::string &interfaceName,
                                  const std::string &destinationName, const std::string &nextHop)
{
    NETNATIVE_LOGI("UpdateRoute,interfaceName:%{public}s,destination:%{public}s,nextHop:%{public}s",
                   interfaceName.c_str(), ToAnonymousIp(destinationName).c_str(), ToAnonymousIp(nextHop).c_str());

    RouteInfo routeInfo;
    if (SetRouteInfo(tableType, interfaceName, destinationName, nextHop, routeInfo) != 0) {
        return -1;
    }
    return UpdateRouteRule(RTM_NEWROUTE, NLM_F_REPLACE, routeInfo);
}

int32_t RouteManager::AddInterfaceToDefaultNetwork(const std::string &interfaceName, NetworkPermission permission)
{
    NETNATIVE_LOGI("AddInterfaceToDefaultNetwork, %{public}s;permission:%{public}d;", interfaceName.c_str(),
                   permission);
    uint32_t table = FindTableByInterfacename(interfaceName);
    if (table == RT_TABLE_UNSPEC) {
        return -1;
    }
    Fwmark fwmark;
    fwmark.netId = NETID_UNSET;
    fwmark.permission = permission;

    Fwmark mask;
    mask.netId = FWMARK_NET_ID_MASK;
    mask.permission = permission;

    // This is a user-defined structure used to integrate the information required for setting up rules.
    RuleInfo ruleInfo;
    ruleInfo.ruleTable = table;
    ruleInfo.rulePriority = RULE_LEVEL_DEFAULT;
    ruleInfo.ruleFwmark = fwmark.intValue;
    ruleInfo.ruleMask = mask.intValue;
    ruleInfo.ruleIif = RULEIIF_LOOPBACK;
    ruleInfo.ruleOif = RULEOIF_NULL;
    return UpdateRuleInfo(RTM_NEWRULE, FR_ACT_TO_TBL, ruleInfo);
}

int32_t RouteManager::RemoveInterfaceFromDefaultNetwork(const std::string &interfaceName, NetworkPermission permission)
{
    NETNATIVE_LOGI("RemoveInterfaceFromDefaultNetwork, %{public}s;permission:%{public}d;", interfaceName.c_str(),
                   permission);
    uint32_t table = FindTableByInterfacename(interfaceName);
    if (table == RT_TABLE_UNSPEC) {
        return -1;
    }

    Fwmark fwmark;
    fwmark.netId = NETID_UNSET;
    fwmark.permission = permission;

    Fwmark mask;
    mask.netId = FWMARK_NET_ID_MASK;
    mask.permission = permission;

    RuleInfo ruleInfo;
    ruleInfo.ruleTable = table;
    ruleInfo.rulePriority = RULE_LEVEL_DEFAULT;
    ruleInfo.ruleFwmark = fwmark.intValue;
    ruleInfo.ruleMask = mask.intValue;
    ruleInfo.ruleIif = RULEIIF_LOOPBACK;
    ruleInfo.ruleOif = RULEOIF_NULL;
    return UpdateRuleInfo(RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo);
}

int32_t RouteManager::AddInterfaceToPhysicalNetwork(uint16_t netId, const std::string &interfaceName,
                                                    NetworkPermission permission)
{
    NETNATIVE_LOGI("AddInterfaceToPhysicalNetwork, netId:%{public}d;interfaceName:%{public}s;permission:%{public}d;",
                   netId, interfaceName.c_str(), permission);
    return UpdatePhysicalNetwork(netId, interfaceName, permission, ADD_CONTROL);
}

int32_t RouteManager::RemoveInterfaceFromPhysicalNetwork(uint16_t netId, const std::string &interfaceName,
                                                         NetworkPermission permission)
{
    NETNATIVE_LOGI("RemoveInterfacePhysicalNetwork, netId:%{public}d;interfaceName:%{public}s;permission:%{public}d;",
                   netId, interfaceName.c_str(), permission);
    if (int32_t ret = UpdatePhysicalNetwork(netId, interfaceName, permission, DEL_CONTROL)) {
        NETNATIVE_LOGE("UpdatePhysicalNetwork err, error is %{public}d", ret);
        return ret;
    }
    if (int32_t ret = ClearRoutes(interfaceName, netId)) {
        NETNATIVE_LOGE("ClearRoutes err, error is %{public}d", ret);
        return ret;
    }
    if (NetManagerStandard::IsInternalNetId(netId)) {
        NETNATIVE_LOGI("InternalNetId skip");
        return 0;
    }
    if (int32_t ret = ClearSharingRules(interfaceName)) {
        NETNATIVE_LOGE("ClearSharingRules err, error is %{public}d", ret);
        return ret;
    }

    return 0;
}

int32_t RouteManager::ModifyPhysicalNetworkPermission(uint16_t netId, const std::string &interfaceName,
                                                      NetworkPermission oldPermission, NetworkPermission newPermission)
{
    NETNATIVE_LOGI("ModifyPhysicalNetworkPermission, %{public}s", interfaceName.c_str());
    if (int32_t ret = UpdatePhysicalNetwork(netId, interfaceName, newPermission, ADD_CONTROL)) {
        NETNATIVE_LOGE("UpdatePhysicalNetwork err, error is %{public}d", ret);
        return ret;
    }

    return UpdatePhysicalNetwork(netId, interfaceName, newPermission, DEL_CONTROL);
}

int32_t RouteManager::AddInterfaceToVirtualNetwork(int32_t netId, const std::string &interfaceName)
{
    return ModifyVirtualNetBasedRules(netId, interfaceName, true);
}

int32_t RouteManager::RemoveInterfaceFromVirtualNetwork(int32_t netId, const std::string &interfaceName)
{
    if (ModifyVirtualNetBasedRules(netId, interfaceName, false) != ROUTEMANAGER_SUCCESS) {
        return ROUTEMANAGER_ERROR;
    }
    return ClearRouteInfo(RTM_GETROUTE, ROUTE_VPN_NETWORK_TABLE);
}

int32_t RouteManager::ModifyVirtualNetBasedRules(int32_t netId, const std::string &ifaceName, bool add)
{
    NETNATIVE_LOGI("ModifyVirtualNetBasedRules,add===%{public}d", add);
    uint32_t table = GetRouteTableFromType(RouteManager::VPN_NETWORK, ifaceName);
    if (table == RT_TABLE_UNSPEC) {
        NETNATIVE_LOGE("table == RT_TABLE_UNSPEC, this is error");
        return ROUTEMANAGER_ERROR;
    }

    // If the rule fails to be added, continue to execute the next rule
    int32_t ret = UpdateVpnOutputToLocalRule(ifaceName, add);
    ret += UpdateVpnSystemPermissionRule(netId, table, add);
    ret += UpdateExplicitNetworkRuleWithUid(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add);
    return ret;
}

int32_t RouteManager::UpdateVpnOutputToLocalRule(const std::string &interfaceName, bool add)
{
    RuleInfo ruleInfo;
    ruleInfo.ruleTable = ROUTE_LOCAL_NETWORK_TABLE;
    ruleInfo.rulePriority = RULE_LEVEL_VPN_OUTPUT_TO_LOCAL;
    ruleInfo.ruleFwmark = MARK_UNSET;
    ruleInfo.ruleMask = MARK_UNSET;
    if (interfaceName.find("vpn") == std::string::npos) {
        ruleInfo.ruleIif = interfaceName;
    }
    ruleInfo.ruleOif = RULEOIF_NULL;

    return UpdateRuleInfo(add ? RTM_NEWRULE : RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo, INVALID_UID, INVALID_UID);
}

int32_t RouteManager::UpdateVpnSystemPermissionRule(int32_t netId, uint32_t table, bool add)
{
    Fwmark fwmark;
    fwmark.netId = netId;
    NetworkPermission permission = NetworkPermission::PERMISSION_SYSTEM;
    fwmark.permission = permission;

    Fwmark mask;
    mask.netId = FWMARK_NET_ID_MASK;
    mask.permission = permission;

    RuleInfo ruleInfo;
    ruleInfo.ruleTable = table;
    ruleInfo.rulePriority = RULE_LEVEL_SECURE_VPN;
    ruleInfo.ruleFwmark = fwmark.intValue;
    ruleInfo.ruleMask = mask.intValue;
    ruleInfo.ruleIif = RULEIIF_NULL;
    ruleInfo.ruleOif = RULEOIF_NULL;

    return UpdateRuleInfo(add ? RTM_NEWRULE : RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo, INVALID_UID, INVALID_UID);
}

int32_t RouteManager::AddUsersToVirtualNetwork(int32_t netId, const std::string &interfaceName,
                                               const std::vector<NetManagerStandard::UidRange> &uidRanges)
{
    return UpdateVirtualNetwork(netId, interfaceName, uidRanges, true);
}

int32_t RouteManager::RemoveUsersFromVirtualNetwork(int32_t netId, const std::string &interfaceName,
                                                    const std::vector<NetManagerStandard::UidRange> &uidRanges)
{
    return UpdateVirtualNetwork(netId, interfaceName, uidRanges, false);
}

int32_t RouteManager::UpdateVirtualNetwork(int32_t netId, const std::string &interfaceName,
                                           const std::vector<NetManagerStandard::UidRange> &uidRanges, bool add)
{
    NETNATIVE_LOGI("UpdateVirtualNetwork, add == %{public}d", add);
    uint32_t table = GetRouteTableFromType(RouteManager::VPN_NETWORK, interfaceName);
    if (table == RT_TABLE_UNSPEC) {
        NETNATIVE_LOGE("table == RT_TABLE_UNSPEC, this is error");
        return ROUTEMANAGER_ERROR;
    }
    int32_t ret = ROUTEMANAGER_SUCCESS;
    for (auto range : uidRanges) {
        // If the rule fails to be added, continue to execute the next rule
        ret += UpdateVpnUidRangeRule(table, range.begin_, range.end_, add);
        ret += UpdateExplicitNetworkRuleWithUid(netId, table, PERMISSION_NONE, range.begin_, range.end_, add);
        ret += UpdateOutputInterfaceRulesWithUid(interfaceName, table, PERMISSION_NONE, range.begin_, range.end_, add);
    }
    return ret;
}

int32_t RouteManager::UpdateVnicUidRangesRule(const std::vector<NetManagerStandard::UidRange> &uidRanges, bool add)
{
    int32_t ret = ROUTEMANAGER_SUCCESS;
    for (const auto &range : uidRanges) {
        Fwmark fwmark;
        Fwmark mask;
        fwmark.protectedFromVpn = false;
        mask.protectedFromVpn = false;

        RuleInfo ruleInfo;
        ruleInfo.ruleTable = ROUTE_VNIC_TABLE;
        ruleInfo.rulePriority = RULE_LEVEL_VNIC_NETWORK;
        ruleInfo.ruleFwmark = fwmark.intValue;
        ruleInfo.ruleMask = mask.intValue;
        ruleInfo.ruleIif = RULEIIF_LOOPBACK;
        ruleInfo.ruleOif = RULEOIF_NULL;
        ret += UpdateRuleInfo(add ? RTM_NEWRULE : RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo, range.begin_, range.end_);
    }
    return ret;
}

int32_t RouteManager::UpdateVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, bool add)
{
    Fwmark fwmark;
    Fwmark mask;
    fwmark.protectedFromVpn = false;
    mask.protectedFromVpn = true;

    RuleInfo ruleInfo;
    ruleInfo.ruleTable = table;
    ruleInfo.rulePriority = RULE_LEVEL_SECURE_VPN;
    ruleInfo.ruleFwmark = fwmark.intValue;
    ruleInfo.ruleMask = mask.intValue;
    ruleInfo.ruleIif = RULEIIF_LOOPBACK;
    ruleInfo.ruleOif = RULEOIF_NULL;
    return UpdateRuleInfo(add ? RTM_NEWRULE : RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo, uidStart, uidEnd);
}

int32_t RouteManager::UpdateExplicitNetworkRuleWithUid(int32_t netId, uint32_t table, NetworkPermission permission,
                                                       uid_t uidStart, uid_t uidEnd, bool add)
{
    NETNATIVE_LOGI("UpdateExplicitNetworkRuleWithUid");
    Fwmark fwmark;
    fwmark.netId = netId;
    fwmark.explicitlySelected = true;
    fwmark.permission = permission;

    Fwmark mask;
    mask.netId = FWMARK_NET_ID_MASK;
    mask.explicitlySelected = true;
    mask.permission = permission;

    RuleInfo ruleInfo;
    ruleInfo.ruleTable = table;
    ruleInfo.rulePriority = RULE_LEVEL_EXPLICIT_NETWORK;
    ruleInfo.ruleFwmark = fwmark.intValue;
    ruleInfo.ruleMask = mask.intValue;
    ruleInfo.ruleIif = RULEIIF_LOOPBACK;
    ruleInfo.ruleOif = RULEOIF_NULL;

    return UpdateRuleInfo(add ? RTM_NEWRULE : RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo, uidStart, uidEnd);
}

int32_t RouteManager::UpdateOutputInterfaceRulesWithUid(const std::string &interface, uint32_t table,
                                                        NetworkPermission permission, uid_t uidStart, uid_t uidEnd,
                                                        bool add)
{
    NETNATIVE_LOGI("UpdateOutputInterfaceRulesWithUid interface:%{public}s", interface.c_str());
    Fwmark fwmark;
    fwmark.permission = permission;

    Fwmark mask;
    mask.permission = permission;

    RuleInfo ruleInfo;
    ruleInfo.ruleTable = table;
    ruleInfo.rulePriority = RULE_LEVEL_OUTPUT_IFACE_VPN;
    ruleInfo.ruleFwmark = fwmark.intValue;
    ruleInfo.ruleMask = mask.intValue;
    ruleInfo.ruleIif = RULEIIF_LOOPBACK;
    ruleInfo.ruleOif = interface;

    return UpdateRuleInfo(add ? RTM_NEWRULE : RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo, uidStart, uidEnd);
}

int32_t RouteManager::AddInterfaceToLocalNetwork(uint16_t netId, const std::string &interfaceName)
{
    NETNATIVE_LOGI("AddInterfaceToLocalNetwork, %{public}s", interfaceName.c_str());
    if (int32_t ret = UpdateLocalNetwork(netId, interfaceName, ADD_CONTROL)) {
        NETNATIVE_LOGE("UpdateLocalNetwork err, error is %{public}d", ret);
        return ret;
    }
    std::lock_guard lock(interfaceToTableLock_);
    interfaceToTable_[interfaceName] = ROUTE_LOCAL_NETWORK_TABLE;

    return 0;
}

int32_t RouteManager::RemoveInterfaceFromLocalNetwork(uint16_t netId, const std::string &interfaceName)
{
    NETNATIVE_LOGI("RemoveInterfaceFromLocalNetwork");
    if (int32_t ret = UpdateLocalNetwork(netId, interfaceName, DEL_CONTROL)) {
        NETNATIVE_LOGE("UpdateLocalNetwork err, error is %{public}d", ret);
        return ret;
    }
    std::lock_guard lock(interfaceToTableLock_);
    interfaceToTable_.erase(interfaceName);

    return 0;
}

int32_t RouteManager::EnableSharing(const std::string &inputInterface, const std::string &outputInterface)
{
    return UpdateSharingNetwork(RTM_NEWRULE, inputInterface, outputInterface);
}

int32_t RouteManager::DisableSharing(const std::string &inputInterface, const std::string &outputInterface)
{
    return UpdateSharingNetwork(RTM_DELRULE, inputInterface, outputInterface);
}

int32_t RouteManager::ReadAddrGw(const std::string &addr, InetAddr *res)
{
    if (res == nullptr) {
        return -1;
    }

    std::string addressString(addr.c_str());
    if (strchr(addr.c_str(), ':')) {
        res->family = AF_INET6;
        res->bitlen = OUTPUT_MAX;
    } else {
        res->family = AF_INET;
        res->bitlen = BIT_32_LEN;
    }

    return inet_pton(res->family, addressString.c_str(), res->data);
}

int32_t RouteManager::ReadAddr(const std::string &addr, InetAddr *res)
{
    if (res == nullptr) {
        return -EINVAL;
    }

    const char *slashStr = strchr(addr.c_str(), '/');
    if (slashStr == nullptr) {
        return -EINVAL;
    }

    const char *maskLenStr = slashStr + 1;
    if (*maskLenStr == 0) {
        return -EINVAL;
    }

    char *endptr = nullptr;
    unsigned templen = strtoul(maskLenStr, &endptr, DECIMAL_DIGITAL);
    if ((endptr == nullptr) || (templen > BIT_MAX_LEN)) {
        return -EINVAL;
    }
    res->prefixlen = templen;

    std::string addressString(addr.c_str(), slashStr - addr.c_str());
    if (strchr(addr.c_str(), ':')) {
        res->family = AF_INET6;
        res->bitlen = OUTPUT_MAX;
    } else {
        res->family = AF_INET;
        res->bitlen = BIT_32_LEN;
    }

    return inet_pton(res->family, addressString.c_str(), res->data);
}

int32_t RouteManager::AddClatTunInterface(const std::string &interfaceName, const std::string &dstAddr,
                                          const std::string &nxtHop)
{
    NETNATIVE_LOGI("AddClatTunInterface, interfaceName:%{public}s; dstAddr:%{public}s; nxtHop:%{public}s;",
                   interfaceName.c_str(), dstAddr.c_str(), nxtHop.c_str());
    if (int32_t ret = AddRoute(RouteManager::INTERFACE, interfaceName, dstAddr, nxtHop)) {
        NETNATIVE_LOGE("AddRoute err, error is %{public}d", ret);
        return ret;
    }
    return UpdateClatTunInterface(interfaceName, PERMISSION_NONE, ADD_CONTROL);
}

int32_t RouteManager::RemoveClatTunInterface(const std::string &interfaceName)
{
    NETNATIVE_LOGI("RemoveClatTunInterface, interfaceName:%{public}s", interfaceName.c_str());
    if (int32_t ret = UpdateClatTunInterface(interfaceName, PERMISSION_NONE, DEL_CONTROL)) {
        NETNATIVE_LOGE("UpdatePhysicalNetwork err, error is %{public}d", ret);
        return ret;
    }
    if (int32_t ret = ClearRoutes(interfaceName)) {
        NETNATIVE_LOGE("ClearRoutes err, error is %{public}d", ret);
        return ret;
    }
    if (int32_t ret = ClearSharingRules(interfaceName)) {
        NETNATIVE_LOGE("ClearSharingRules err, error is %{public}d", ret);
        return ret;
    }

    return 0;
}

int32_t RouteManager::UpdateClatTunInterface(const std::string &interfaceName, NetworkPermission permission, bool add)
{
    NETNATIVE_LOGI("UpdateClatTunInterface, interfaceName: %{public}s, permission: %{public}d, add: %{public}d",
                   interfaceName.c_str(), static_cast<int32_t>(permission), add);
    uint32_t table = FindTableByInterfacename(interfaceName);
    if (table == RT_TABLE_UNSPEC) {
        NETNATIVE_LOGE("table == RT_TABLE_UNSPEC, this is error");
        return -1;
    }

    Fwmark fwmark;
    fwmark.permission = permission;

    Fwmark mask;
    mask.permission = permission;

    RuleInfo ruleInfo;
    ruleInfo.ruleTable = table;
    ruleInfo.rulePriority = RULE_LEVEL_CLAT_TUN;
    ruleInfo.ruleFwmark = fwmark.intValue;
    ruleInfo.ruleMask = mask.intValue;
    ruleInfo.ruleIif = RULEIIF_LOOPBACK;
    ruleInfo.ruleOif = RULEOIF_NULL;

    if (int32_t ret = UpdateRuleInfo(add ? RTM_NEWRULE : RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo)) {
        NETNATIVE_LOGE("UpdateRuleInfo failed, err is %{public}d", ret);
        return ret;
    }

    return 0;
}

int32_t RouteManager::Init()
{
    NETNATIVE_LOGI("Init");
    // need to call IptablesWrapper's RunCommand function.
    std::string commandNew;
    commandNew.append(" -t mangle -N ");
    commandNew.append(LOCAL_MANGLE_INPUT);

    std::string commandJump;
    commandJump.append(" -A INPUT -j ");
    commandJump.append(LOCAL_MANGLE_INPUT);

    if (int32_t ret = ClearRules()) {
        NETNATIVE_LOGE("ClearRules failed, err is %{public}d", ret);
        return ret;
    }

    if (access(NETSYS_ROUTE_INIT_DIR_PATH, F_OK) == 0) {
        if (int32_t ret = AddLocalNetworkRules()) {
            NETNATIVE_LOGE("AddLocalNetworkRules failed, err is %{public}d", ret);
            return ret;
        }
    } else {
        NETNATIVE_LOGI("AddLocalNetworkRules init ok, do not need repeat");
    }

    return 0;
}

int32_t RouteManager::ClearRules()
{
    return ClearRouteInfo(RTM_GETRULE, 0) >= 0 ? 0 : -1;
}

int32_t RouteManager::ClearRoutes(const std::string &interfaceName, int32_t netId)
{
    std::lock_guard lock(RouteManager::interfaceToTableLock_);
    uint32_t table = FindTableByInterfacename(interfaceName, netId);
    NETNATIVE_LOGI("ClearRoutes--table==:%{public}d", table);
    if (table == RT_TABLE_UNSPEC) {
        return -1;
    }
    int32_t ret = ClearRouteInfo(RTM_GETROUTE, table);
    if (ret == 0 && table != ROUTE_INTERNAL_DEFAULT_TABLE) {
        interfaceToTable_.erase(interfaceName);
    }

    return 0;
}

int32_t RouteManager::AddLocalNetworkRules()
{
    NETNATIVE_LOGI("AddLocalNetworkRules");
    if (int32_t ret =
            UpdateExplicitNetworkRule(LOCAL_NET_ID, ROUTE_LOCAL_NETWORK_TABLE, PERMISSION_NONE, ADD_CONTROL)) {
        NETNATIVE_LOGE("UpdateExplicitNetworkRule failed, err is %{public}d", ret);
        return ret;
    }
    Fwmark fwmark;
    fwmark.explicitlySelected = false;

    Fwmark mask;
    mask.explicitlySelected = true;

    RuleInfo ruleInfo;
    ruleInfo.ruleTable = ROUTE_LOCAL_NETWORK_TABLE;
    ruleInfo.rulePriority = RULE_LEVEL_LOCAL_NETWORK;
    ruleInfo.ruleFwmark = fwmark.intValue;
    ruleInfo.ruleMask = mask.intValue;
    ruleInfo.ruleIif = RULEIIF_NULL;
    ruleInfo.ruleOif = RULEOIF_NULL;

    return UpdateRuleInfo(RTM_NEWRULE, FR_ACT_TO_TBL, ruleInfo);
}

int32_t RouteManager::UpdatePhysicalNetwork(uint16_t netId, const std::string &interfaceName,
                                            NetworkPermission permission, bool add)
{
    NETNATIVE_LOGI("UpdatePhysicalNetwork,add===%{public}d", add);
    uint32_t table = FindTableByInterfacename(interfaceName, netId);
    if (table == RT_TABLE_UNSPEC) {
        NETNATIVE_LOGE("table == RT_TABLE_UNSPEC, this is error");
        return -1;
    }

    if (int32_t ret = UpdateExplicitNetworkRule(netId, table, permission, add)) {
        NETNATIVE_LOGE("UpdateExplicitNetworkRule failed, err is %{public}d", ret);
        return ret;
    }

    if (int32_t ret = UpdateOutputInterfaceRules(interfaceName, table, permission, add)) {
        NETNATIVE_LOGE("UpdateOutputInterfaceRules failed, err is %{public}d", ret);
        return ret;
    }

    return 0;
}

int32_t RouteManager::UpdateLocalNetwork(uint16_t netId, const std::string &interfaceName, bool add)
{
    NETNATIVE_LOGI("UpdateLocalNetwork");
    return UpdateOutputInterfaceRules(interfaceName, ROUTE_LOCAL_NETWORK_TABLE, PERMISSION_NONE, add);
}

int32_t RouteManager::UpdateIncomingPacketMark(uint16_t netId, const std::string &interfaceName,
                                               NetworkPermission permission, bool add)
{
    NETNATIVE_LOGI("UpdateIncomingPacketMark");
    Fwmark fwmark;
    fwmark.netId = netId;
    fwmark.explicitlySelected = true;
    fwmark.protectedFromVpn = true;
    fwmark.permission = permission;
    const uint32_t mask = ~Fwmark::GetUidBillingMask();
    std::string action = "";
    if (add) {
        action = " -A ";
    } else {
        action = " -D ";
    }
    std::stringstream ss;
    ss << action << LOCAL_MANGLE_INPUT << " -i " << interfaceName << " -j MARK --set-mark 0x" << std::nouppercase
       << std::hex << fwmark.intValue << "/0x" << std::nouppercase << std::hex << mask;
    // need to call IptablesWrapper's RunCommand function.

    return 0;
}

int32_t RouteManager::UpdateExplicitNetworkRule(uint16_t netId, uint32_t table, NetworkPermission permission, bool add)
{
    NETNATIVE_LOGI("UpdateExplicitNetworkRule");
    Fwmark fwmark;
    fwmark.netId = netId;
    fwmark.explicitlySelected = true;
    fwmark.permission = permission;

    Fwmark mask;
    mask.netId = FWMARK_NET_ID_MASK;
    mask.explicitlySelected = true;
    mask.permission = permission;

    RuleInfo ruleInfo;
    ruleInfo.ruleTable = table;
    ruleInfo.rulePriority = RULE_LEVEL_EXPLICIT_NETWORK;
    ruleInfo.ruleFwmark = fwmark.intValue;
    ruleInfo.ruleMask = mask.intValue;
    ruleInfo.ruleIif = RULEIIF_LOOPBACK;
    ruleInfo.ruleOif = RULEOIF_NULL;

    if (NetManagerStandard::IsInternalNetId(netId)) {
        return UpdateRuleInfo(add ? RTM_NEWRULE : RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo, UID_ALLOW_INTERNAL.first,
                              UID_ALLOW_INTERNAL.second);
    }
    return UpdateRuleInfo(add ? RTM_NEWRULE : RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo);
}

int32_t RouteManager::UpdateOutputInterfaceRules(const std::string &interfaceName, uint32_t table,
                                                 NetworkPermission permission, bool add)
{
    NETNATIVE_LOGI("UpdateOutputInterfaceRules");
    Fwmark fwmark;
    fwmark.permission = permission;

    Fwmark mask;
    mask.permission = permission;

    RuleInfo ruleInfo;
    ruleInfo.ruleTable = table;
    ruleInfo.rulePriority = RULE_LEVEL_OUTPUT_INTERFACE;
    ruleInfo.ruleFwmark = fwmark.intValue;
    ruleInfo.ruleMask = mask.intValue;
    ruleInfo.ruleIif = RULEIIF_LOOPBACK;
    ruleInfo.ruleOif = interfaceName;

    return UpdateRuleInfo(add ? RTM_NEWRULE : RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo);
}

int32_t RouteManager::UpdateSharingNetwork(uint16_t action, const std::string &inputInterface,
                                           const std::string &outputInterface)
{
    NETNATIVE_LOGI("UpdateSharingNetwork");
    uint32_t table = FindTableByInterfacename(outputInterface);
    if (table == RT_TABLE_UNSPEC) {
        return -1;
    }

    RuleInfo ruleInfo;
    ruleInfo.ruleTable = table;
    ruleInfo.rulePriority = RULE_LEVEL_SHARING;
    ruleInfo.ruleFwmark = MARK_UNSET;
    ruleInfo.ruleMask = MARK_UNSET;
    ruleInfo.ruleIif = inputInterface;
    ruleInfo.ruleOif = RULEOIF_NULL;

    return UpdateRuleInfo(action, FR_ACT_TO_TBL, ruleInfo);
}

int32_t RouteManager::ClearSharingRules(const std::string &inputInterface)
{
    NETNATIVE_LOGI("ClearSharingRules");

    RuleInfo ruleInfo;
    ruleInfo.ruleTable = 0;
    ruleInfo.rulePriority = RULE_LEVEL_SHARING;
    ruleInfo.ruleFwmark = MARK_UNSET;
    ruleInfo.ruleMask = MARK_UNSET;
    ruleInfo.ruleIif = inputInterface;
    ruleInfo.ruleOif = RULEOIF_NULL;

    return UpdateRuleInfo(RTM_DELRULE, FR_ACT_TO_TBL, ruleInfo);
}

int32_t RouteManager::UpdateRuleInfo(uint32_t action, uint8_t ruleType, RuleInfo ruleInfo, uid_t uidStart, uid_t uidEnd)
{
    NETNATIVE_LOGI("UpdateRuleInfo");
    if (ruleInfo.rulePriority < 0) {
        NETNATIVE_LOGE("invalid IP-rule priority %{public}d", ruleInfo.rulePriority);
        return ROUTEMANAGER_ERROR;
    }

    if (ruleInfo.ruleFwmark & ~ruleInfo.ruleMask) {
        NETNATIVE_LOGE("mask 0x%{public}x does not select all the bits set in fwmark 0x%{public}x", ruleInfo.ruleMask,
                       ruleInfo.ruleFwmark);
        return ROUTEMANAGER_ERROR;
    }

    if (ruleInfo.ruleTable == RT_TABLE_UNSPEC && ruleType == FR_ACT_TO_TBL && action != RTM_DELRULE) {
        NETNATIVE_LOGE("RT_TABLE_UNSPEC only allowed when deleting rules");
        return -ENOTUNIQ;
    }

    // The main work is to assemble the structure required for rule.
    for (const uint8_t family : {AF_INET, AF_INET6}) {
        if (SendRuleToKernel(action, family, ruleType, ruleInfo, uidStart, uidEnd) < 0) {
            NETNATIVE_LOGE("Update %{public}s rule info failed, action = %{public}d",
                           (family == AF_INET) ? "IPv4" : "IPv6", action);
            return NETMANAGER_ERR_INTERNAL;
        }
    }
    return NETMANAGER_SUCCESS;
}

int32_t RouteManager::SendRuleToKernel(uint32_t action, uint8_t family, uint8_t ruleType, RuleInfo ruleInfo,
                                       uid_t uidStart, uid_t uidEnd)
{
    struct fib_rule_hdr msg = {0};
    msg.action = ruleType;
    msg.family = family;
    uint16_t ruleFlag = (action == RTM_NEWRULE) ? NLM_F_CREATE : NLM_F_EXCL;
    NetlinkMsg nlmsg(ruleFlag, NETLINK_MAX_LEN, getpid());
    nlmsg.AddRule(action, msg);
    if (int32_t ret = nlmsg.AddAttr32(FRA_PRIORITY, ruleInfo.rulePriority)) {
        return ret;
    }
    if (ruleInfo.ruleTable != RT_TABLE_UNSPEC) {
        if (int32_t ret = nlmsg.AddAttr32(FRA_TABLE, ruleInfo.ruleTable)) {
            return ret;
        }
    }
    if (ruleInfo.ruleMask != 0) {
        if (int32_t ret = nlmsg.AddAttr32(FRA_FWMARK, ruleInfo.ruleFwmark)) {
            return ret;
        }
        if (int32_t ret = nlmsg.AddAttr32(FRA_FWMASK, ruleInfo.ruleMask)) {
            return ret;
        }
    }
    if ((uidStart != INVALID_UID) && (uidEnd != INVALID_UID)) {
        FibRuleUidRange uidRange = {uidStart, uidEnd};
        if (int32_t ret = nlmsg.AddAttr(FRA_UID_RANGE, &uidRange, sizeof(uidRange))) {
            NETNATIVE_LOGE("SendRuleToKernel FRA_UID_RANGE is error.");
            return ret;
        }
    }
    if (ruleInfo.ruleIif != RULEIIF_NULL) {
        char ruleIifName[IFNAMSIZ] = {0};
        size_t ruleIifLength = strlcpy(ruleIifName, ruleInfo.ruleIif.c_str(), IFNAMSIZ) + 1;
        if (int32_t ret = nlmsg.AddAttr(FRA_IIFNAME, ruleIifName, ruleIifLength)) {
            return ret;
        }
    }
    if (ruleInfo.ruleOif != RULEOIF_NULL) {
        char ruleOifName[IFNAMSIZ] = {0};
        size_t ruleOifLength = strlcpy(ruleOifName, ruleInfo.ruleOif.c_str(), IFNAMSIZ) + 1;
        if (int32_t ret = nlmsg.AddAttr(FRA_OIFNAME, ruleOifName, ruleOifLength)) {
            return ret;
        }
    }

    return SendNetlinkMsgToKernel(nlmsg.GetNetLinkMessage());
}

int32_t RouteManager::UpdateRouteRule(uint16_t action, uint16_t flags, RouteInfo routeInfo)
{
    NETNATIVE_LOG_D("UpdateRouteRule");
    RouteInfo routeInfoModify = routeInfo;
    // The main work is to assemble the structure required for route.
    struct rtmsg msg;
    (void)memset_s(&msg, sizeof(msg), 0, sizeof(msg));
    msg.rtm_family = AF_INET;
    msg.rtm_dst_len = BIT_32_LEN;
    msg.rtm_protocol = RTPROT_STATIC;
    msg.rtm_scope = RT_SCOPE_UNIVERSE;
    msg.rtm_type = RTN_UNICAST;
    msg.rtm_table = RT_TABLE_UNSPEC;

    uint32_t index = 0;
    if (!routeInfo.routeNextHop.empty() && !strcmp(routeInfo.routeNextHop.c_str(), "unreachable")) {
        msg.rtm_type = RTN_UNREACHABLE;
        routeInfoModify.routeInterfaceName = "";
        routeInfoModify.routeNextHop = "";
    } else if (!routeInfo.routeNextHop.empty() && !strcmp(routeInfo.routeNextHop.c_str(), "throw")) {
        msg.rtm_type = RTN_THROW;
        routeInfoModify.routeInterfaceName = "";
        routeInfoModify.routeNextHop = "";
    } else {
        index = if_nametoindex(routeInfo.routeInterfaceName.c_str());
    }

    int32_t ret = SendRouteToKernel(action, flags, msg, routeInfoModify, index);
    if (ret < 0) {
        NETNATIVE_LOGE("SendNetlinkMsgToKernel Error ret = %{public}d", ret);
        return ret;
    }

    return 0;
}

int32_t RouteManager::SendRouteToKernel(uint16_t action, uint16_t routeFlag, rtmsg msg, RouteInfo routeInfo,
                                        uint32_t index)
{
    InetAddr dst;
    int32_t readAddrResult = ReadAddr(routeInfo.routeDestinationName, &dst);
    if (readAddrResult != 1) {
        NETNATIVE_LOGE("dest parse failed:%{public}d", readAddrResult);
        return -1;
    }
    msg.rtm_family = static_cast<uint8_t>(dst.family);
    msg.rtm_dst_len = static_cast<uint8_t>(dst.prefixlen);
    if (dst.family == AF_INET) {
        msg.rtm_scope = RT_SCOPE_LINK;
    } else if (dst.family == AF_INET6) {
        msg.rtm_scope = RT_SCOPE_UNIVERSE;
    }

    InetAddr gw = {0};
    if (!routeInfo.routeNextHop.empty() && ReadAddrGw(routeInfo.routeNextHop, &gw) <= 0) {
        NETNATIVE_LOGE("gw parse failed:%{public}d", readAddrResult);
        return -1;
    }
    if (gw.bitlen != 0) {
        msg.rtm_scope = RT_SCOPE_UNIVERSE;
        msg.rtm_family = static_cast<uint8_t>(gw.family);
    }
    NetlinkMsg nlmsg(routeFlag, NETLINK_MAX_LEN, getpid());
    nlmsg.AddRoute(action, msg);
    if (int32_t ret = nlmsg.AddAttr32(RTA_TABLE, routeInfo.routeTable)) {
        return ret;
    }
    if (int32_t ret = nlmsg.AddAttr(RTA_DST, dst.data, dst.bitlen / BYTE_ALIGNMENT)) {
        return ret;
    }
    if (!routeInfo.routeNextHop.empty()) {
        if (int32_t ret = nlmsg.AddAttr(RTA_GATEWAY, gw.data, gw.bitlen / BYTE_ALIGNMENT)) {
            return ret;
        }
    }
    if (!routeInfo.routeInterfaceName.empty()) {
        NETNATIVE_LOGI("index is :%{public}d", index);
        if (int32_t ret = nlmsg.AddAttr32(RTA_OIF, index)) {
            return ret;
        }
    }

    return SendNetlinkMsgToKernel(nlmsg.GetNetLinkMessage());
}

uint32_t RouteManager::FindTableByInterfacename(const std::string &interfaceName, int32_t netId)
{
    NETNATIVE_LOGI("FindTableByInterfacename netId %{public}d", netId);
    if (NetManagerStandard::IsInternalNetId(netId)) {
        return ROUTE_INTERNAL_DEFAULT_TABLE;
    }
    auto iter = interfaceToTable_.find(interfaceName);
    if (iter != interfaceToTable_.end()) {
        return iter->second;
    }

    uint32_t table = if_nametoindex(interfaceName.c_str());
    if (table == 0) {
        NETNATIVE_LOGE("RouteManager cannot find interface %{public}s", interfaceName.c_str());
        return RT_TABLE_UNSPEC;
    }
    table += THOUSAND_LEN;
    interfaceToTable_[interfaceName] = table;
    return table;
}

uint32_t RouteManager::GetRouteTableFromType(TableType tableType, const std::string &interfaceName)
{
    switch (tableType) {
        case RouteManager::INTERFACE:
            return FindTableByInterfacename(interfaceName);
        case RouteManager::LOCAL_NETWORK:
            return ROUTE_LOCAL_NETWORK_TABLE;
        case RouteManager::VPN_NETWORK:
            return ROUTE_VPN_NETWORK_TABLE;
        case RouteManager::INTERNAL_DEFAULT:
            return ROUTE_INTERNAL_DEFAULT_TABLE;
        default:
            NETNATIVE_LOGE("tableType [%{tableType}d] is error", tableType);
            return RT_TABLE_UNSPEC;
    }
}

int32_t RouteManager::SetRouteInfo(TableType tableType, const std::string &interfaceName,
                                   const std::string &destinationName, const std::string &nextHop, RouteInfo &routeInfo)
{
    uint32_t table = GetRouteTableFromType(tableType, interfaceName);
    if (table == RT_TABLE_UNSPEC) {
        return -1;
    }

    routeInfo.routeTable = table;
    routeInfo.routeInterfaceName = interfaceName;
    routeInfo.routeDestinationName = destinationName;
    routeInfo.routeNextHop = nextHop;
    return 0;
}
} // namespace nmd
} // namespace OHOS