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88 lines
2.5 KiB
88 lines
2.5 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "router.h"
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#include "netlink.h"
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#include <linux/rtnetlink.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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Router::Router() : mSocketFd(-1) {
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}
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Router::~Router() {
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if (mSocketFd != -1) {
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::close(mSocketFd);
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mSocketFd = -1;
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}
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}
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Result Router::init() {
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// Create a netlink socket to the router
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mSocketFd = ::socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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if (mSocketFd == -1) {
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return Result::error(strerror(errno));
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}
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return Result::success();
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}
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Result Router::setDefaultGateway(in_addr_t gateway, unsigned int ifaceIndex) {
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struct Request {
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struct nlmsghdr hdr;
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struct rtmsg msg;
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char buf[256];
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} request;
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memset(&request, 0, sizeof(request));
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// Set up a request to create a new route
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request.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(request.msg));
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request.hdr.nlmsg_type = RTM_NEWROUTE;
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request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE;
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request.msg.rtm_family = AF_INET;
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request.msg.rtm_dst_len = 0;
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request.msg.rtm_table = RT_TABLE_MAIN;
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request.msg.rtm_protocol = RTPROT_BOOT;
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request.msg.rtm_scope = RT_SCOPE_UNIVERSE;
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request.msg.rtm_type = RTN_UNICAST;
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addRouterAttribute(request, RTA_GATEWAY, &gateway, sizeof(gateway));
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addRouterAttribute(request, RTA_OIF, &ifaceIndex, sizeof(ifaceIndex));
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return sendNetlinkMessage(&request, request.hdr.nlmsg_len);
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}
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Result Router::sendNetlinkMessage(const void* data, size_t size) {
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struct sockaddr_nl nlAddress;
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memset(&nlAddress, 0, sizeof(nlAddress));
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nlAddress.nl_family = AF_NETLINK;
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int res = ::sendto(mSocketFd, data, size, 0,
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reinterpret_cast<sockaddr*>(&nlAddress),
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sizeof(nlAddress));
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if (res == -1) {
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return Result::error("Unable to send on netlink socket: %s",
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strerror(errno));
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}
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return Result::success();
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}
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