further ipv6 integration + filter for packages not in 200::/7 range

src/main.rs

@@ -78,15 +78,14 @@ async fn main() -> Result<(), Box<dyn Error>> {
 
     // Read packets from the TUN interface (originating from the kernel) and send them to the router
     // Note: we will never receive control packets from the kernel, only data packets
-    // filter out packets that are not destined for 200::/7
     {
         let router = router.clone();
         let node_tun = node_tun.clone();
-
+    
         tokio::spawn(async move {
             loop {
                 let mut buf = BytesMut::zeroed(LINK_MTU);
-
+    
                 match node_tun.recv(&mut buf).await {
                     Ok(n) => {
                         buf.truncate(n);
@@ -96,7 +95,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
                         continue;
                     }
                 }
-
+    
                 let packet = match PacketHeaders::from_ip_slice(&buf) {
                     Ok(packet) => packet,
                     Err(e) => {
@@ -105,7 +104,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
                         continue;
                     }
                 };
-
+    
                 let dest_addr = if let Some(IpHeader::Version6(header, _)) = packet.ip {
                     let dest_addr = Ipv6Addr::from(header.destination);
                     println!("Destination IPv6 address: {}", dest_addr);
@@ -114,7 +113,14 @@ async fn main() -> Result<(), Box<dyn Error>> {
                     println!("Non-IPv6 packet received, ignoring...");
                     continue;
                 };
-
+    
+                // Check if destination address is in 200::/7 range
+                let first_byte = dest_addr.segments()[0] >> 8; // get the first byte
+                if first_byte < 0x20 || first_byte > 0x3F {
+                    println!("Packet not destined for 200::/7 range, ignoring...");
+                    continue;
+                }
+    
                 // inject own pubkey
                 let data_packet = DataPacket {
                     dest_ip: dest_addr,
@@ -122,7 +128,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
                     raw_data: buf.to_vec(), // this needs to be encrypted
                 };
                 
-
+    
                 if router.router_data_tx().send(data_packet).is_err() {
                     eprintln!("Failed to send data_packet");
                 }

src/node_setup.rs

@@ -37,6 +37,7 @@ pub async fn retrieve_tun_link_index(handle: Handle) -> Result<u32, Box<dyn std:
 }
 
 // Add address to TUN interface
+// this automatically creates a routing entry (for the /64 prefix)
 pub async fn add_address(handle: Handle, addr: Ipv6Addr, link_index: u32) -> Result<u32, Box<dyn std::error::Error>> {
     // add address to tun interface
     handle

src/router.rs

@@ -29,7 +29,7 @@ pub struct StaticRoute {
 impl StaticRoute {
     pub fn new(prefix: IpAddr) -> Self {
         Self {
-            plen: 32,
+            plen: 64,
             prefix,
             seqno: 0,
         }