+static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(m);
+ assert(link);
+ assert(link->ifname);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0)
+ log_link_warning_errno(link, r, "Could not set link flags: %m");
+
+ return 1;
+}
+
+static int link_set_flags(Link *link) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+ unsigned ifi_change = 0;
+ unsigned ifi_flags = 0;
+ int r;
+
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+
+ if (link->flags & IFF_LOOPBACK)
+ return 0;
+
+ if (!link->network)
+ return 0;
+
+ if (link->network->arp < 0)
+ return 0;
+
+ r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
+
+ if (link->network->arp >= 0) {
+ ifi_change |= IFF_NOARP;
+ ifi_flags |= IFF_NOARP;
+ }
+
+ r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not set link flags: %m");
+
+ r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
+
+ link_ref(link);
+
+ return 0;
+}
+