/*
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* Copyright (C) 2008 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 <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#define LOG_TAG "Netd"
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#include <log/log.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nfnetlink_log.h>
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#include <linux/netfilter/nfnetlink_compat.h>
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#include <arpa/inet.h>
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#include "NetlinkManager.h"
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#include "NetlinkHandler.h"
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#include "pcap-netfilter-linux-android.h"
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namespace android {
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namespace net {
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const int NetlinkManager::NFLOG_QUOTA_GROUP = 1;
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const int NetlinkManager::NETFILTER_STRICT_GROUP = 2;
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const int NetlinkManager::NFLOG_WAKEUP_GROUP = 3;
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NetlinkManager *NetlinkManager::sInstance = nullptr;
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NetlinkManager *NetlinkManager::Instance() {
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if (!sInstance)
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sInstance = new NetlinkManager();
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return sInstance;
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}
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NetlinkManager::NetlinkManager() {
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mBroadcaster = nullptr;
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}
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NetlinkManager::~NetlinkManager() {
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}
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NetlinkHandler *NetlinkManager::setupSocket(int *sock, int netlinkFamily,
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int groups, int format, bool configNflog) {
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struct sockaddr_nl nladdr;
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int sz = 64 * 1024;
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int on = 1;
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memset(&nladdr, 0, sizeof(nladdr));
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nladdr.nl_family = AF_NETLINK;
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// Kernel will assign a unique nl_pid if set to zero.
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nladdr.nl_pid = 0;
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nladdr.nl_groups = groups;
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if ((*sock = socket(PF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, netlinkFamily)) < 0) {
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ALOGE("Unable to create netlink socket for family %d: %s", netlinkFamily, strerror(errno));
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return nullptr;
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}
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// When running in a net/user namespace, SO_RCVBUFFORCE will fail because
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// it will check for the CAP_NET_ADMIN capability in the root namespace.
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// Try using SO_RCVBUF if that fails.
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if (setsockopt(*sock, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)) < 0 &&
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setsockopt(*sock, SOL_SOCKET, SO_RCVBUF, &sz, sizeof(sz)) < 0) {
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ALOGE("Unable to set uevent socket SO_RCVBUF option: %s", strerror(errno));
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close(*sock);
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return nullptr;
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}
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if (setsockopt(*sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
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SLOGE("Unable to set uevent socket SO_PASSCRED option: %s", strerror(errno));
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close(*sock);
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return nullptr;
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}
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if (bind(*sock, (struct sockaddr *) &nladdr, sizeof(nladdr)) < 0) {
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ALOGE("Unable to bind netlink socket: %s", strerror(errno));
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close(*sock);
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return nullptr;
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}
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if (configNflog) {
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if (android_nflog_send_config_cmd(*sock, 0, NFULNL_CFG_CMD_PF_UNBIND, AF_INET) < 0) {
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ALOGE("Failed NFULNL_CFG_CMD_PF_UNBIND: %s", strerror(errno));
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return nullptr;
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}
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if (android_nflog_send_config_cmd(*sock, 0, NFULNL_CFG_CMD_PF_BIND, AF_INET) < 0) {
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ALOGE("Failed NFULNL_CFG_CMD_PF_BIND: %s", strerror(errno));
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return nullptr;
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}
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if (android_nflog_send_config_cmd(*sock, 0, NFULNL_CFG_CMD_BIND, AF_UNSPEC) < 0) {
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ALOGE("Failed NFULNL_CFG_CMD_BIND: %s", strerror(errno));
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return nullptr;
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}
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}
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NetlinkHandler *handler = new NetlinkHandler(this, *sock, format);
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if (handler->start()) {
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ALOGE("Unable to start NetlinkHandler: %s", strerror(errno));
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close(*sock);
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return nullptr;
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}
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return handler;
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}
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int NetlinkManager::start() {
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if ((mUeventHandler = setupSocket(&mUeventSock, NETLINK_KOBJECT_UEVENT,
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0xffffffff, NetlinkListener::NETLINK_FORMAT_ASCII, false)) == nullptr) {
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return -1;
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}
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if ((mRouteHandler = setupSocket(&mRouteSock, NETLINK_ROUTE,
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RTMGRP_LINK |
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RTMGRP_IPV4_IFADDR |
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RTMGRP_IPV6_IFADDR |
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RTMGRP_IPV6_ROUTE |
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(1 << (RTNLGRP_ND_USEROPT - 1)),
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NetlinkListener::NETLINK_FORMAT_BINARY, false)) == nullptr) {
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return -1;
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}
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if ((mQuotaHandler = setupSocket(&mQuotaSock, NETLINK_NFLOG,
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NFLOG_QUOTA_GROUP, NetlinkListener::NETLINK_FORMAT_BINARY, false)) == nullptr) {
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ALOGW("Unable to open qlog quota socket, check if xt_quota2 can send via UeventHandler");
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// TODO: return -1 once the emulator gets a new kernel.
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}
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if ((mStrictHandler = setupSocket(&mStrictSock, NETLINK_NETFILTER,
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0, NetlinkListener::NETLINK_FORMAT_BINARY_UNICAST, true)) == nullptr) {
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ALOGE("Unable to open strict socket");
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// TODO: return -1 once the emulator gets a new kernel.
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}
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return 0;
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}
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int NetlinkManager::stop() {
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int status = 0;
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if (mUeventHandler->stop()) {
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ALOGE("Unable to stop uevent NetlinkHandler: %s", strerror(errno));
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status = -1;
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}
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delete mUeventHandler;
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mUeventHandler = nullptr;
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close(mUeventSock);
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mUeventSock = -1;
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if (mRouteHandler->stop()) {
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ALOGE("Unable to stop route NetlinkHandler: %s", strerror(errno));
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status = -1;
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}
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delete mRouteHandler;
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mRouteHandler = nullptr;
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close(mRouteSock);
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mRouteSock = -1;
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if (mQuotaHandler) {
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if (mQuotaHandler->stop()) {
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ALOGE("Unable to stop quota NetlinkHandler: %s", strerror(errno));
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status = -1;
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}
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delete mQuotaHandler;
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mQuotaHandler = nullptr;
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close(mQuotaSock);
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mQuotaSock = -1;
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}
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if (mStrictHandler) {
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if (mStrictHandler->stop()) {
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ALOGE("Unable to stop strict NetlinkHandler: %s", strerror(errno));
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status = -1;
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}
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delete mStrictHandler;
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mStrictHandler = nullptr;
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close(mStrictSock);
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mStrictSock = -1;
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}
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return status;
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}
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} // namespace net
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} // namespace android
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