From a6d9072f5c6ae29f7d77adef8bfcc70d3974de7f Mon Sep 17 00:00:00 2001
From: Minecon724 <minecon724@noreply.git.m724.eu>
Date: Sun, 31 Aug 2025 06:55:36 +0200
Subject: [PATCH] Allow (only) dn42 IPs

---
 nano/node/transport/transport.cpp | 100 ++++--------------------------
 1 file changed, 12 insertions(+), 88 deletions(-)

diff --git a/nano/node/transport/transport.cpp b/nano/node/transport/transport.cpp
index d3ec24be..7f3e5668 100644
--- a/nano/node/transport/transport.cpp
+++ b/nano/node/transport/transport.cpp
@@ -71,98 +71,22 @@ bool nano::transport::reserved_address (nano::endpoint const & endpoint_a, bool
 {
 	debug_assert (endpoint_a.address ().is_v6 ());
 	auto bytes (endpoint_a.address ().to_v6 ());
-	auto result (false);
-	static auto const rfc1700_min (mapped_from_v4_bytes (0x00000000ul));
-	static auto const rfc1700_max (mapped_from_v4_bytes (0x00fffffful));
-	static auto const rfc1918_1_min (mapped_from_v4_bytes (0x0a000000ul));
-	static auto const rfc1918_1_max (mapped_from_v4_bytes (0x0afffffful));
-	static auto const rfc1918_2_min (mapped_from_v4_bytes (0xac100000ul));
-	static auto const rfc1918_2_max (mapped_from_v4_bytes (0xac1ffffful));
-	static auto const rfc1918_3_min (mapped_from_v4_bytes (0xc0a80000ul));
-	static auto const rfc1918_3_max (mapped_from_v4_bytes (0xc0a8fffful));
-	static auto const rfc6598_min (mapped_from_v4_bytes (0x64400000ul));
-	static auto const rfc6598_max (mapped_from_v4_bytes (0x647ffffful));
-	static auto const rfc5737_1_min (mapped_from_v4_bytes (0xc0000200ul));
-	static auto const rfc5737_1_max (mapped_from_v4_bytes (0xc00002fful));
-	static auto const rfc5737_2_min (mapped_from_v4_bytes (0xc6336400ul));
-	static auto const rfc5737_2_max (mapped_from_v4_bytes (0xc63364fful));
-	static auto const rfc5737_3_min (mapped_from_v4_bytes (0xcb007100ul));
-	static auto const rfc5737_3_max (mapped_from_v4_bytes (0xcb0071fful));
-	static auto const ipv4_multicast_min (mapped_from_v4_bytes (0xe0000000ul));
-	static auto const ipv4_multicast_max (mapped_from_v4_bytes (0xeffffffful));
-	static auto const rfc6890_min (mapped_from_v4_bytes (0xf0000000ul));
-	static auto const rfc6890_max (mapped_from_v4_bytes (0xfffffffful));
-	static auto const rfc6666_min (boost::asio::ip::make_address_v6 ("100::"));
-	static auto const rfc6666_max (boost::asio::ip::make_address_v6 ("100::ffff:ffff:ffff:ffff"));
-	static auto const rfc3849_min (boost::asio::ip::make_address_v6 ("2001:db8::"));
-	static auto const rfc3849_max (boost::asio::ip::make_address_v6 ("2001:db8:ffff:ffff:ffff:ffff:ffff:ffff"));
-	static auto const rfc4193_min (boost::asio::ip::make_address_v6 ("fc00::"));
-	static auto const rfc4193_max (boost::asio::ip::make_address_v6 ("fd00:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
-	static auto const ipv6_multicast_min (boost::asio::ip::make_address_v6 ("ff00::"));
-	static auto const ipv6_multicast_max (boost::asio::ip::make_address_v6 ("ff00:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
-	if (endpoint_a.port () == 0)
+	auto result (true);
+
+	static auto const dn42_ipv4_min (mapped_from_v4_bytes (0xac140000ul));
+	static auto const dn42_ipv4_max (mapped_from_v4_bytes (0xac14fffful));
+	static auto const dn42_ipv6_min (boost::asio::ip::make_address_v6 ("fd00::"));
+	static auto const dn42_ipv6_max (boost::asio::ip::make_address_v6 ("fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"));
+
+	if (bytes >= dn42_ipv4_min && bytes <= dn42_ipv4_max)
 	{
-		result = true;
+		result = false;
 	}
-	else if (bytes >= rfc1700_min && bytes <= rfc1700_max)
+	else if (bytes >= dn42_ipv6_min && bytes <= dn42_ipv6_max)
 	{
-		result = true;
-	}
-	else if (bytes >= rfc5737_1_min && bytes <= rfc5737_1_max)
-	{
-		result = true;
-	}
-	else if (bytes >= rfc5737_2_min && bytes <= rfc5737_2_max)
-	{
-		result = true;
-	}
-	else if (bytes >= rfc5737_3_min && bytes <= rfc5737_3_max)
-	{
-		result = true;
-	}
-	else if (bytes >= ipv4_multicast_min && bytes <= ipv4_multicast_max)
-	{
-		result = true;
-	}
-	else if (bytes >= rfc6890_min && bytes <= rfc6890_max)
-	{
-		result = true;
-	}
-	else if (bytes >= rfc6666_min && bytes <= rfc6666_max)
-	{
-		result = true;
-	}
-	else if (bytes >= rfc3849_min && bytes <= rfc3849_max)
-	{
-		result = true;
-	}
-	else if (bytes >= ipv6_multicast_min && bytes <= ipv6_multicast_max)
-	{
-		result = true;
-	}
-	else if (!allow_local_peers)
-	{
-		if (bytes >= rfc1918_1_min && bytes <= rfc1918_1_max)
-		{
-			result = true;
-		}
-		else if (bytes >= rfc1918_2_min && bytes <= rfc1918_2_max)
-		{
-			result = true;
-		}
-		else if (bytes >= rfc1918_3_min && bytes <= rfc1918_3_max)
-		{
-			result = true;
-		}
-		else if (bytes >= rfc6598_min && bytes <= rfc6598_max)
-		{
-			result = true;
-		}
-		else if (bytes >= rfc4193_min && bytes <= rfc4193_max)
-		{
-			result = true;
-		}
+		result = false;
 	}
+	
 	return result;
 }