/*
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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 <errno.h>
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#include <error.h>
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#include <hidl/HidlSupport.h>
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#include <jni.h>
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#include <nativehelper/JNIHelp.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netlink.h>
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#include <sys/socket.h>
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#include <android-base/unique_fd.h>
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#include <android/hardware/tetheroffload/config/1.0/IOffloadConfig.h>
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#define LOG_TAG "OffloadHardwareInterface"
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#include <utils/Log.h>
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namespace android {
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using hardware::hidl_handle;
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using hardware::hidl_string;
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using hardware::tetheroffload::config::V1_0::IOffloadConfig;
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namespace {
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inline const sockaddr * asSockaddr(const sockaddr_nl *nladdr) {
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return reinterpret_cast<const sockaddr *>(nladdr);
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}
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int conntrackSocket(unsigned groups) {
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base::unique_fd s(socket(AF_NETLINK, SOCK_DGRAM, NETLINK_NETFILTER));
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if (s.get() < 0) return -errno;
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const struct sockaddr_nl bind_addr = {
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.nl_family = AF_NETLINK,
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.nl_pad = 0,
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.nl_pid = 0,
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.nl_groups = groups,
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};
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if (bind(s.get(), asSockaddr(&bind_addr), sizeof(bind_addr)) != 0) {
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return -errno;
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}
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const struct sockaddr_nl kernel_addr = {
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.nl_family = AF_NETLINK,
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.nl_pad = 0,
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.nl_pid = 0,
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.nl_groups = groups,
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};
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if (connect(s.get(), asSockaddr(&kernel_addr), sizeof(kernel_addr)) != 0) {
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return -errno;
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}
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return s.release();
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}
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// Return a hidl_handle that owns the file descriptor owned by fd, and will
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// auto-close it (otherwise there would be double-close problems).
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//
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// Rely upon the compiler to eliminate the constexprs used for clarity.
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hidl_handle handleFromFileDescriptor(base::unique_fd fd) {
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hidl_handle h;
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static constexpr int kNumFds = 1;
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static constexpr int kNumInts = 0;
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native_handle_t *nh = native_handle_create(kNumFds, kNumInts);
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nh->data[0] = fd.release();
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static constexpr bool kTakeOwnership = true;
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h.setTo(nh, kTakeOwnership);
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return h;
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}
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} // namespace
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static jboolean android_server_connectivity_tethering_OffloadHardwareInterface_configOffload(
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JNIEnv* /* env */) {
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sp<IOffloadConfig> configInterface = IOffloadConfig::getService();
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if (configInterface.get() == nullptr) {
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ALOGD("Could not find IOffloadConfig service.");
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return false;
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}
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// Per the IConfigOffload definition:
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//
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// fd1 A file descriptor bound to the following netlink groups
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// (NF_NETLINK_CONNTRACK_NEW | NF_NETLINK_CONNTRACK_DESTROY).
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//
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// fd2 A file descriptor bound to the following netlink groups
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// (NF_NETLINK_CONNTRACK_UPDATE | NF_NETLINK_CONNTRACK_DESTROY).
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base::unique_fd
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fd1(conntrackSocket(NF_NETLINK_CONNTRACK_NEW | NF_NETLINK_CONNTRACK_DESTROY)),
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fd2(conntrackSocket(NF_NETLINK_CONNTRACK_UPDATE | NF_NETLINK_CONNTRACK_DESTROY));
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if (fd1.get() < 0 || fd2.get() < 0) {
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ALOGE("Unable to create conntrack handles: %d/%s", errno, strerror(errno));
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return false;
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}
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hidl_handle h1(handleFromFileDescriptor(std::move(fd1))),
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h2(handleFromFileDescriptor(std::move(fd2)));
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bool rval(false);
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hidl_string msg;
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const auto status = configInterface->setHandles(h1, h2,
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[&rval, &msg](bool success, const hidl_string& errMsg) {
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rval = success;
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msg = errMsg;
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});
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if (!status.isOk() || !rval) {
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ALOGE("IOffloadConfig::setHandles() error: '%s' / '%s'",
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status.description().c_str(), msg.c_str());
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// If status is somehow not ok, make sure rval captures this too.
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rval = false;
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}
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return rval;
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}
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/*
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* JNI registration.
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*/
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static const JNINativeMethod gMethods[] = {
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/* name, signature, funcPtr */
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{ "configOffload", "()Z",
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(void*) android_server_connectivity_tethering_OffloadHardwareInterface_configOffload },
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};
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int register_android_server_connectivity_tethering_OffloadHardwareInterface(JNIEnv* env) {
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return jniRegisterNativeMethods(env,
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"com/android/server/connectivity/tethering/OffloadHardwareInterface",
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gMethods, NELEM(gMethods));
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}
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}; // namespace android
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