interface-ip: fix delegate config update on reload (FS#2087)

Update the no_delegation parameter on a config reload; in case prefixes
are present update the prefix assignments as well according to the
no_delegation status

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

3 files changed, 24 insertions, 1 deletions

diff --git a/interface-ip.c b/interface-ip.c
index 1a6c28d..83f1dfa 100644
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -1053,6 +1053,20 @@ void interface_refresh_assignments(bool hint)
 	refresh = hint;
 }
 
+void interface_update_prefix_delegation(struct interface_ip_settings *ip)
+{
+	struct device_prefix *prefix;
+
+	vlist_for_each_element(&ip->prefix, prefix, node) {
+		interface_update_prefix_assignments(prefix, !ip->no_delegation);
+
+		if (ip->no_delegation) {
+			if (prefix->head.next)
+				list_del(&prefix->head);
+		} else
+			list_add(&prefix->head, &prefixes);
+	}
+}
 
 static void
 interface_update_prefix(struct vlist_tree *tree,
diff --git a/interface-ip.h b/interface-ip.h
index ec6d7fb..21c6e9b 100644
--- a/interface-ip.h
+++ b/interface-ip.h
@@ -172,5 +172,6 @@ struct device_prefix* interface_ip_add_device_prefix(struct interface *iface,
 		struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass);
 void interface_ip_set_ula_prefix(const char *prefix);
 void interface_refresh_assignments(bool hint);
+void interface_update_prefix_delegation(struct interface_ip_settings *ip);
 
 #endif
diff --git a/interface.c b/interface.c
index b21d234..b8c4ae2 100644
--- a/interface.c
+++ b/interface.c
@@ -1197,7 +1197,7 @@ static void
 interface_change_config(struct interface *if_old, struct interface *if_new)
 {
 	struct blob_attr *old_config = if_old->config;
-	bool reload = false, reload_ip = false;
+	bool reload = false, reload_ip = false, update_prefix_delegation = false;
 
 #define FIELD_CHANGED_STR(field)					\
 		((!!if_old->field != !!if_new->field) ||		\
@@ -1247,6 +1247,11 @@ interface_change_config(struct interface *if_old, struct interface *if_new)
 	if_old->force_link = if_new->force_link;
 	if_old->dns_metric = if_new->dns_metric;
 
+	if (if_old->proto_ip.no_delegation != if_new->proto_ip.no_delegation) {
+		if_old->proto_ip.no_delegation = if_new->proto_ip.no_delegation;
+		update_prefix_delegation = true;
+	}
+
 	if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 	interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 
@@ -1276,6 +1281,9 @@ interface_change_config(struct interface *if_old, struct interface *if_new)
 		interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
 	}
 
+	if (update_prefix_delegation)
+		interface_update_prefix_delegation(&if_old->proto_ip);
+
 	interface_write_resolv_conf();
 	if (if_old->main_dev.dev)
 		interface_check_state(if_old);