/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * 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.
 */

#define LOG_TAG "jniThreadInfra"

#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <ifaddrs.h>
#include <inttypes.h>
#include <linux/if_arp.h>
#include <linux/ioctl.h>
#include <log/log.h>
#include <net/if.h>
#include <netdb.h>
#include <netinet/icmp6.h>
#include <netinet/in.h>
#include <private/android_filesystem_config.h>
#include <signal.h>
#include <spawn.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include "jni.h"
#include "nativehelper/JNIHelp.h"
#include "nativehelper/scoped_utf_chars.h"

namespace android {
static jint
com_android_server_thread_InfraInterfaceController_createFilteredIcmp6Socket(JNIEnv *env,
                                                                             jobject clazz) {
  // Initializes the ICMPv6 socket.
  int sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
  if (sock == -1) {
    jniThrowExceptionFmt(env, "java/io/IOException", "failed to create the socket (%s)",
                         strerror(errno));
    return -1;
  }

  struct icmp6_filter filter;
  // Only accept Router Advertisements, Router Solicitations and Neighbor
  // Advertisements.
  ICMP6_FILTER_SETBLOCKALL(&filter);
  ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filter);
  ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filter);
  ICMP6_FILTER_SETPASS(ND_NEIGHBOR_ADVERT, &filter);

  if (setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filter, sizeof(filter)) != 0) {
    jniThrowExceptionFmt(env, "java/io/IOException", "failed to setsockopt ICMP6_FILTER (%s)",
                         strerror(errno));
    close(sock);
    return -1;
  }

  return sock;
}

/*
 * JNI registration.
 */

static const JNINativeMethod gMethods[] = {
    /* name, signature, funcPtr */
    {"nativeCreateFilteredIcmp6Socket", "()I",
     (void *)com_android_server_thread_InfraInterfaceController_createFilteredIcmp6Socket},
};

int register_com_android_server_thread_InfraInterfaceController(JNIEnv *env) {
  return jniRegisterNativeMethods(env, "com/android/server/thread/InfraInterfaceController",
                                  gMethods, NELEM(gMethods));
}

}; // namespace android