From 6cb04f616f82e4a277ee229dc16754657fc34a4c Mon Sep 17 00:00:00 2001
From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Mon, 23 May 2022 13:30:47 +0200
Subject: [PATCH] dnsdist: Proper handling of scope IDs for MAC addresses

Thanks to Peter for the correct check!
---
 pdns/misc.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pdns/misc.cc b/pdns/misc.cc
index 9af6543b42..4b682489a7 100644
--- a/pdns/misc.cc
+++ b/pdns/misc.cc
@@ -1211,6 +1211,10 @@ int getMACAddress(const ComboAddress& ca, char* dest, size_t destLen)
         continue;
       }
 
+      if (ca.sin4.sin_family == AF_INET6 && ca.sin6.sin6_scope_id != 0 && static_cast<int32_t>(ca.sin6.sin6_scope_id) != nd->ndm_ifindex) {
+        continue;
+      }
+
       for (; done == false && RTA_OK(rtatp, rtattrlen); rtatp = RTA_NEXT(rtatp, rtattrlen)) {
         if (rtatp->rta_type == NDA_DST){
           if (nd->ndm_family == AF_INET) {
-- 
2.47.2