network: make link_may_have_ipv6ll() optionally check Multicast= setting

Fixes the IPv6LL issue in #23197.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/network/networkd-ipv6ll.c b/src/network/networkd-ipv6ll.c
index 9b85989701..32229a3fc7 100644
--- a/src/network/networkd-ipv6ll.c
+++ b/src/network/networkd-ipv6ll.c
@@ -38,7 +38,7 @@ bool link_ipv6ll_enabled(Link *link) {
         return link->network->link_local & ADDRESS_FAMILY_IPV6;
 }
 
-bool link_may_have_ipv6ll(Link *link) {
+bool link_may_have_ipv6ll(Link *link, bool check_multicast) {
         assert(link);
 
         /*
@@ -62,6 +62,9 @@ bool link_may_have_ipv6ll(Link *link) {
                 if (!link->network)
                         return false;
 
+                if (check_multicast && !FLAGS_SET(link->flags, IFF_MULTICAST) && link->network->multicast <= 0)
+                        return false;
+
                 ORDERED_HASHMAP_FOREACH(a, link->network->addresses_by_section) {
                         if (a->family != AF_INET6)
                                 continue;