chore: release v0.21.1 (#206)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.21.1](https://github.com/achanda/ipnetwork/compare/v0.21.0...v0.21.1) - 2025-01-07
+
+### Other
+
+- Fix for 0::/0 network ([#205](https://github.com/achanda/ipnetwork/pull/205))
+
 ## [0.21.0](https://github.com/achanda/ipnetwork/compare/v0.20.0...v0.21.0) - 2025-01-06
 
 ### Fixed

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ipnetwork"
-version = "0.21.0"
+version = "0.21.1"
 authors = ["Abhishek Chanda <abhishek.becs@gmail.com>", "Linus Färnstrand <faern@faern.net>"]
 description = "A library to work with IP CIDRs in Rust"
 license = "MIT OR Apache-2.0"

src/ipv6.rs

@@ -203,6 +203,9 @@ impl Ipv6Network {
     pub fn mask(&self) -> Ipv6Addr {
         debug_assert!(self.prefix <= IPV6_BITS);
 
+        if self.prefix == 0 {
+            return Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0);
+        }
         let mask = u128::MAX << (IPV6_BITS - self.prefix);
         Ipv6Addr::from(mask)
     }
@@ -279,6 +282,10 @@ impl Ipv6Network {
     /// ```
     pub fn size(&self) -> u128 {
         debug_assert!(self.prefix <= IPV6_BITS);
+
+        if self.prefix == 0 {
+            return u128::MAX;
+        }
         1 << (IPV6_BITS - self.prefix)
     }
 
@@ -757,4 +764,17 @@ mod test {
         );
         assert_eq!(net.nth(net.size()), None);
     }
+
+    #[test]
+    fn test_mask_with_prefix_0() {
+        let network: Ipv6Network = "0::/0".parse().unwrap();
+        let mask = network.mask();
+        assert_eq!(mask, Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0));
+    }
+
+    #[test]
+    fn test_size_with_prefix_0() {
+        let network: Ipv6Network = "0::/0".parse().unwrap();
+        assert_eq!(network.size(), u128::MAX);
+    }
 }