From a8af2b40ab9a0e000e89205f7983b82c0b71a890 Mon Sep 17 00:00:00 2001
From: Tyler Cloutier <cloutiertyler@users.noreply.github.com>
Date: Sun, 29 Oct 2017 19:38:08 -0700
Subject: [PATCH] Added isLinkLocalUnicast as defined in
 https://golang.org/src/net/ip.go

---
 NetUtils/Interface.swift | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/NetUtils/Interface.swift b/NetUtils/Interface.swift
index 71118ca..9f103ae 100644
--- a/NetUtils/Interface.swift
+++ b/NetUtils/Interface.swift
@@ -190,6 +190,21 @@ open class Interface : CustomStringConvertible, CustomDebugStringConvertible {
     
     /// `IFF_MULTICAST` flag of `ifaddrs->ifa_flags`.
     open var supportsMulticast: Bool { return multicastSupported }
+    
+    /// IsLinkLocalUnicast as defined in https://golang.org/src/net/ip.go
+    open var isLinkLocalUnicast: Bool {
+        guard let addressBytes = self.addressBytes else {
+            return false
+        }
+        switch self.family {
+        case .ipv4:
+            return addressBytes[0] == 169 && addressBytes[1] == 254
+        case .ipv6:
+            return addressBytes[0] == 0xfe && addressBytes[1] & 0xc0 == 0x80
+        case .other:
+            return false
+        }
+    }
 
     /// Field `ifaddrs->ifa_name`.
     open let name : String