merged minor IPv6 fix from libtorrent_aio

src/broadcast_socket.cpp

@@ -66,7 +66,10 @@ namespace libtorrent
 	{
 		TORRENT_TRY {
 #if TORRENT_USE_IPV6
-			if (a.is_v6()) return a.to_v6().is_link_local();
+			if (a.is_v6())
+			{
+				return a.to_v6() == address_v6::loopback();
+			}
 #endif
 			address_v4 a4 = a.to_v4();
 			unsigned long ip = a4.to_ulong();

src/policy.cpp

@@ -1360,6 +1360,14 @@ namespace libtorrent
 		if (remote.address() == address() || remote.port() == 0)
 			return 0;
 
+#if TORRENT_USE_IPV6
+		// don't allow link-local IPv6 addresses since they
+		// can't be used like normal addresses, they require an interface
+		// and will just cause connect() to fail with EINVAL
+		if (remote.address().is_v6() && remote.address().to_v6().is_link_local())
+			return 0;
+#endif
+
 		aux::session_impl& ses = m_torrent->session();
 
 		// if this is an i2p torrent, and we don't allow mixed mode