From 94abefc00bb22b93493831798391d5d5b21f9d4c Mon Sep 17 00:00:00 2001
From: "Ondrej Zajicek (work)" <santiago@crfreenet.org>
Date: Mon, 15 Mar 2021 18:35:23 +0100
Subject: [PATCH] Filter: Update 'gw' to handle IPv6 link-local addresses
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When a link-local address is set, use the existing iface for scope.

Thanks to Marcel Krüger for the bugreport.
---
 filter/f-inst.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/filter/f-inst.c b/filter/f-inst.c
index 5cae31ba..1378fe4a 100644
--- a/filter/f-inst.c
+++ b/filter/f-inst.c
@@ -559,7 +559,8 @@
       case SA_GW:
 	{
 	  ip_addr ip = v1.val.ip;
-	  neighbor *n = neigh_find(rta->src->proto, ip, NULL, 0);
+	  struct iface *ifa = ipa_is_link_local(ip) ? rta->nh.iface : NULL;
+	  neighbor *n = neigh_find(rta->src->proto, ip, ifa, 0);
 	  if (!n || (n->scope == SCOPE_HOST))
 	    runtime( "Invalid gw address" );