From db04afeb8cfd0351a9c5d32f1a5362ea18a4e48d Mon Sep 17 00:00:00 2001
From: Loyalsoldier <10487845+Loyalsoldier@users.noreply.github.com>
Date: Sat, 14 Oct 2023 21:07:06 +0800
Subject: [PATCH] Feat: support IPv4 address in IPv6 format

This change will convert 4in6 IPv6 addresses to IPv4 addresses
---
 lib/lib.go | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/lib.go b/lib/lib.go
index d1d23abdb9..1f03905182 100644
--- a/lib/lib.go
+++ b/lib/lib.go
@@ -167,8 +167,8 @@ func (e *Entry) processPrefix(src any) (*netip.Prefix, IPType, error) {
 		_, network, err := net.ParseCIDR(src)
 		switch err {
 		case nil:
-			prefix, ok := netipx.FromStdIPNet(network)
-			if !ok {
+			prefix, err2 := netip.ParsePrefix(network.String())
+			if err2 != nil {
 				return nil, "", ErrInvalidIPNet
 			}
 			ip := prefix.Addr()
@@ -190,6 +190,16 @@ func (e *Entry) processPrefix(src any) (*netip.Prefix, IPType, error) {
 			case ip.Is4():
 				prefix := netip.PrefixFrom(ip, 32)
 				return &prefix, IPv4, nil
+			case ip.Is4In6():
+				_, network, err2 := net.ParseCIDR(src + "/128")
+				if err2 != nil {
+					return nil, "", ErrInvalidIPNet
+				}
+				prefix, err3 := netip.ParsePrefix(network.String())
+				if err3 != nil {
+					return nil, "", ErrInvalidIPNet
+				}
+				return &prefix, IPv4, nil
 			case ip.Is6():
 				prefix := netip.PrefixFrom(ip, 128)
 				return &prefix, IPv6, nil