Basic IPv6 Router Advertisement daemon (a3ca6bd3) · Commits · e / os / android_frameworks_base

core/java/android/net/NetworkUtils.java

+8 −1

Original line number	Diff line number	Diff line
		@@ -45,12 +45,19 @@ public class NetworkUtils {
		public native static void attachDhcpFilter(FileDescriptor fd) throws SocketException;

		/**
		* Attaches a socket filter that accepts ICMP6 router advertisement packets to the given socket.
		* Attaches a socket filter that accepts ICMPv6 router advertisements to the given socket.
		* @param fd the socket's {@link FileDescriptor}.
		* @param packetType the hardware address type, one of ARPHRD_*.
		*/
		public native static void attachRaFilter(FileDescriptor fd, int packetType) throws SocketException;

		/**
		* Configures a socket for receiving ICMPv6 router solicitations and sending advertisements.
		* @param fd the socket's {@link FileDescriptor}.
		* @param ifIndex the interface index.
		*/
		public native static void setupRaSocket(FileDescriptor fd, int ifIndex) throws SocketException;

		/**
		* Binds the current process to the network designated by {@code netId}. All sockets created
		* in the future (and not explicitly bound via a bound {@link SocketFactory} (see

core/jni/android_net_NetUtils.cpp

+94 −0

Original line number	Diff line number	Diff line
		@@ -125,6 +125,99 @@ static void android_net_utils_attachRaFilter(JNIEnv *env, jobject clazz, jobject
		}
		}

		static void android_net_utils_setupRaSocket(JNIEnv *env, jobject clazz, jobject javaFd,
		jint ifIndex)
		{
		static const int kLinkLocalHopLimit = 255;

		int fd = jniGetFDFromFileDescriptor(env, javaFd);

		// Set an ICMPv6 filter that only passes Router Solicitations.
		struct icmp6_filter rs_only;
		ICMP6_FILTER_SETBLOCKALL(&rs_only);
		ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &rs_only);
		socklen_t len = sizeof(rs_only);
		if (setsockopt(fd, IPPROTO_ICMPV6, ICMP6_FILTER, &rs_only, len) != 0) {
		jniThrowExceptionFmt(env, "java/net/SocketException",
		"setsockopt(ICMP6_FILTER): %s", strerror(errno));
		return;
		}

		// Most/all of the rest of these options can be set via Java code, but
		// because we're here on account of setting an icmp6_filter go ahead
		// and do it all natively for now.
		//
		// TODO: Consider moving these out to Java.

		// Set the multicast hoplimit to 255 (link-local only).
		int hops = kLinkLocalHopLimit;
		len = sizeof(hops);
		if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops, len) != 0) {
		jniThrowExceptionFmt(env, "java/net/SocketException",
		"setsockopt(IPV6_MULTICAST_HOPS): %s", strerror(errno));
		return;
		}

		// Set the unicast hoplimit to 255 (link-local only).
		hops = kLinkLocalHopLimit;
		len = sizeof(hops);
		if (setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &hops, len) != 0) {
		jniThrowExceptionFmt(env, "java/net/SocketException",
		"setsockopt(IPV6_UNICAST_HOPS): %s", strerror(errno));
		return;
		}

		// Explicitly disable multicast loopback.
		int off = 0;
		len = sizeof(off);
		if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off, len) != 0) {
		jniThrowExceptionFmt(env, "java/net/SocketException",
		"setsockopt(IPV6_MULTICAST_LOOP): %s", strerror(errno));
		return;
		}

		// Specify the IPv6 interface to use for outbound multicast.
		len = sizeof(ifIndex);
		if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &ifIndex, len) != 0) {
		jniThrowExceptionFmt(env, "java/net/SocketException",
		"setsockopt(IPV6_MULTICAST_IF): %s", strerror(errno));
		return;
		}

		// Additional options to be considered:
		// - IPV6_TCLASS
		// - IPV6_RECVPKTINFO
		// - IPV6_RECVHOPLIMIT

		// Bind to [::].
		const struct sockaddr_in6 sin6 = {
		.sin6_family = AF_INET6,
		.sin6_port = 0,
		.sin6_flowinfo = 0,
		.sin6_addr = IN6ADDR_ANY_INIT,
		.sin6_scope_id = 0,
		};
		auto sa = reinterpret_cast<const struct sockaddr *>(&sin6);
		len = sizeof(sin6);
		if (bind(fd, sa, len) != 0) {
		jniThrowExceptionFmt(env, "java/net/SocketException",
		"bind(IN6ADDR_ANY): %s", strerror(errno));
		return;
		}

		// Join the all-routers multicast group, ff02::2%index.
		struct ipv6_mreq all_rtrs = {
		.ipv6mr_multiaddr = {{{0xff,2,0,0,0,0,0,0,0,0,0,0,0,0,0,2}}},
		.ipv6mr_interface = ifIndex,
		};
		len = sizeof(all_rtrs);
		if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &all_rtrs, len) != 0) {
		jniThrowExceptionFmt(env, "java/net/SocketException",
		"setsockopt(IPV6_JOIN_GROUP): %s", strerror(errno));
		return;
		}
		}

		static jboolean android_net_utils_bindProcessToNetwork(JNIEnv *env, jobject thiz, jint netId)
		{
		return (jboolean) !setNetworkForProcess(netId);
		@@ -173,6 +266,7 @@ static const JNINativeMethod gNetworkUtilMethods[] = {
		{ "queryUserAccess", "(II)Z", (void*)android_net_utils_queryUserAccess },
		{ "attachDhcpFilter", "(Ljava/io/FileDescriptor;)V", (void*) android_net_utils_attachDhcpFilter },
		{ "attachRaFilter", "(Ljava/io/FileDescriptor;I)V", (void*) android_net_utils_attachRaFilter },
		{ "setupRaSocket", "(Ljava/io/FileDescriptor;I)V", (void*) android_net_utils_setupRaSocket },
		};

		int register_android_net_NetworkUtils(JNIEnv* env)

services/net/java/android/net/ip/RouterAdvertisementDaemon.java

0 → 100644

+581 −0

File added.

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