From a0558cef64f553b35f761fae6971b81fb4952768 Mon Sep 17 00:00:00 2001
From: Yoshiyuki Mineo <Yoshiyuki.Mineo@jp.sony.com>
Date: Tue, 30 Apr 2024 15:06:58 +0900
Subject: [PATCH] Link local (#53)

* Allow IPv4 Link Local addresses (#50)

* Allow IPv4 Link Local addresses

Allow the use of link local addresses

* Update sonyflake.go

* Update sonyflake.go

* Update a comment

---------

Co-authored-by: Flavio Crisciani <f.crisciani@gmail.com>
---
 sonyflake.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sonyflake.go b/sonyflake.go
index 548b243..2db3325 100644
--- a/sonyflake.go
+++ b/sonyflake.go
@@ -178,8 +178,9 @@ func privateIPv4(interfaceAddrs types.InterfaceAddrs) (net.IP, error) {
 }
 
 func isPrivateIPv4(ip net.IP) bool {
+	// Allow private IP addresses (RFC1918) and link-local addresses (RFC3927)
 	return ip != nil &&
-		(ip[0] == 10 || ip[0] == 172 && (ip[1] >= 16 && ip[1] < 32) || ip[0] == 192 && ip[1] == 168)
+		(ip[0] == 10 || ip[0] == 172 && (ip[1] >= 16 && ip[1] < 32) || ip[0] == 192 && ip[1] == 168 || ip[0] == 169 && ip[1] == 254)
 }
 
 func lower16BitPrivateIP(interfaceAddrs types.InterfaceAddrs) (uint16, error) {