libp2p: warn/refuse bad prefer/ignore combos

1 files changed, 7 insertions, 0 deletions

diff --git a/src/transport/libp2p/ignore.rs b/src/transport/libp2p/ignore.rs
index 659ec91..51e1f45 100644
--- a/src/transport/libp2p/ignore.rs
+++ b/src/transport/libp2p/ignore.rs
@@ -37,6 +37,13 @@ impl FromStr for IpRange {
 }
 
 impl IpRange {
+    /// Whether every address of `other` is in this range too.
+    pub(super) fn covers(&self, other: &IpRange) -> bool {
+        self.network.is_ipv4() == other.network.is_ipv4()
+            && self.prefix <= other.prefix
+            && self.contains(other.network)
+    }
+
     pub(super) fn contains(&self, ip: std::net::IpAddr) -> bool {
         use std::net::IpAddr;
         match (self.network, ip) {