From 9037ea369bae063a4daaaac64c0c4777f55990cc Mon Sep 17 00:00:00 2001
From: Flavio Crisciani <f.crisciani@gmail.com>
Date: Sun, 5 Nov 2023 22:43:49 -0700
Subject: [PATCH] Allow IPv4 Link Local addresses (#50)

* Allow IPv4 Link Local addresses

Allow the use of link local addresses

* Update sonyflake.go

* Update sonyflake.go
---
 sonyflake.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sonyflake.go b/sonyflake.go
index 548b243..c88c464 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 subnets (RFC1918) or link local (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) {