excludes private ip addresses

streamer/src/lib.rs

@@ -2,6 +2,7 @@
 pub mod packet;
 pub mod recvmmsg;
 pub mod sendmmsg;
+pub mod socket;
 pub mod streamer;
 
 #[macro_use]

streamer/src/packet.rs

@@ -1,5 +1,8 @@
 //! The `packet` module defines data structures and methods to pull data from the network.
-use crate::recvmmsg::{recv_mmsg, NUM_RCVMMSGS};
+use crate::{
+    recvmmsg::{recv_mmsg, NUM_RCVMMSGS},
+    socket::is_global,
+};
 pub use solana_perf::packet::{
     limited_deserialize, to_packets_chunked, Packets, PacketsRecycler, NUM_PACKETS,
     PACKETS_PER_BATCH,
@@ -56,8 +59,10 @@ pub fn recv_from(obj: &mut Packets, socket: &UdpSocket, max_wait_ms: u64) -> Res
 
 pub fn send_to(obj: &Packets, socket: &UdpSocket) -> Result<()> {
     for p in &obj.packets {
-        let a = p.meta.addr();
-        socket.send_to(&p.data[..p.meta.size], &a)?;
+        let addr = p.meta.addr();
+        if is_global(&addr) {
+            socket.send_to(&p.data[..p.meta.size], &addr)?;
+        }
     }
     Ok(())
 }

streamer/src/socket.rs

@@ -0,0 +1,28 @@
+use std::net::SocketAddr;
+
+// TODO: remove these once IpAddr::is_global is stable.
+
+#[cfg(test)]
+pub fn is_global(_: &SocketAddr) -> bool {
+    true
+}
+
+#[cfg(not(test))]
+pub fn is_global(addr: &SocketAddr) -> bool {
+    use std::net::IpAddr;
+
+    match addr.ip() {
+        IpAddr::V4(addr) => {
+            // TODO: Consider excluding:
+            //    addr.is_loopback() || addr.is_link_local()
+            // || addr.is_broadcast() || addr.is_documentation()
+            // || addr.is_unspecified()
+            !addr.is_private()
+        }
+        IpAddr::V6(_) => {
+            // TODO: Consider excluding:
+            // addr.is_loopback() || addr.is_unspecified(),
+            true
+        }
+    }
+}