From 9a9f08f70f31172ebe96e807cc7c531c26aea6b1 Mon Sep 17 00:00:00 2001
From: Arvid Norberg <arvid@libtorrent.org>
Date: Wed, 21 Jan 2009 01:39:13 +0000
Subject: [PATCH] enables teredo support on windows

---
 include/libtorrent/socket.hpp | 16 ++++++++++++++++
 src/session_impl.cpp          |  9 ++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/include/libtorrent/socket.hpp b/include/libtorrent/socket.hpp
index d4cc9bdb0..98f5d8151 100644
--- a/include/libtorrent/socket.hpp
+++ b/include/libtorrent/socket.hpp
@@ -213,6 +213,22 @@ namespace libtorrent
 		int m_value;
 	};
 	
+#ifdef TORRENT_WINDOWS
+	struct v6_protection_level
+	{
+		v6_protection_level(int level): m_value(level) {}
+		template<class Protocol>
+		int level(Protocol const&) const { return IPPROTO_IPV6; }
+		template<class Protocol>
+		int name(Protocol const&) const { return IPV6_PROTECTION_LEVEL; }
+		template<class Protocol>
+		int const* data(Protocol const&) const { return &m_value; }
+		template<class Protocol>
+		size_t size(Protocol const&) const { return sizeof(m_value); }
+		int m_value;
+	};
+#endif
+
 	struct type_of_service
 	{
 		type_of_service(char val): m_value(val) {}
diff --git a/src/session_impl.cpp b/src/session_impl.cpp
index f3d97885f..4e33a61a3 100644
--- a/src/session_impl.cpp
+++ b/src/session_impl.cpp
@@ -632,7 +632,14 @@ namespace aux {
 		s.sock.reset(new socket_acceptor(m_io_service));
 		s.sock->open(ep.protocol(), ec);
 		s.sock->set_option(socket_acceptor::reuse_address(true), ec);
-		if (ep.protocol() == tcp::v6()) s.sock->set_option(v6only(v6_only), ec);
+		if (ep.protocol() == tcp::v6())
+		{
+			s.sock->set_option(v6only(v6_only), ec);
+#ifdef TORRENT_WINDOWS
+			// enable Teredo on windows
+			s.sock->set_option(v6_protection_level(PROTECTION_LEVEL_UNRESTRICTED), ec);
+#endif
+		}
 		s.sock->bind(ep, ec);
 		while (ec && retries > 0)
 		{