network: do not remove rule when it is requested by existing links

Otherwise, the first link once removes all saved rules in the foreign
rule database, and the second or later links create again...

diff --git a/src/network/networkd-routing-policy-rule.c b/src/network/networkd-routing-policy-rule.c
index 3941245733fc393e744d7ac395dee8e8a357d793..ae94272781e29223cca010c9acd1d0d8744cb1c4 100644 (file)
--- a/src/network/networkd-routing-policy-rule.c
+++ b/src/network/networkd-routing-policy-rule.c
@@ -1234,6 +1234,26 @@ int routing_policy_load_rules(const char *state_file, Set **rules) {
         return 0;
 }
 
+static bool manager_links_have_routing_policy_rule(Manager *m, RoutingPolicyRule *rule) {
+        RoutingPolicyRule *link_rule;
+        Iterator i;
+        Link *link;
+
+        assert(m);
+        assert(rule);
+
+        HASHMAP_FOREACH(link, m->links, i) {
+                if (!link->network)
+                        continue;
+
+                LIST_FOREACH(rules, link_rule, link->network->rules)
+                        if (routing_policy_rule_compare_func(link_rule, rule) == 0)
+                                return true;
+        }
+
+        return false;
+}
+
 void routing_policy_rule_purge(Manager *m, Link *link) {
         RoutingPolicyRule *rule, *existing;
         Iterator i;
@@ -1247,6 +1267,12 @@ void routing_policy_rule_purge(Manager *m, Link *link) {
                 if (!existing)
                         continue; /* Saved rule does not exist anymore. */
 
+                if (manager_links_have_routing_policy_rule(m, existing))
+                        continue; /* Existing links have the saved rule. */
+
+                /* Existing links do not have the saved rule. Let's drop the rule now, and re-configure it
+                 * later when it is requested. */
+
                 r = routing_policy_rule_remove(existing, link, NULL);
                 if (r < 0) {
                         log_warning_errno(r, "Could not remove routing policy rules: %m");